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WO2018053009A1 - Signaux de référence pour permettre des systèmes de communication - Google Patents

Signaux de référence pour permettre des systèmes de communication Download PDF

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Publication number
WO2018053009A1
WO2018053009A1 PCT/US2017/051375 US2017051375W WO2018053009A1 WO 2018053009 A1 WO2018053009 A1 WO 2018053009A1 US 2017051375 W US2017051375 W US 2017051375W WO 2018053009 A1 WO2018053009 A1 WO 2018053009A1
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WO
WIPO (PCT)
Prior art keywords
pattern
brs
res
frequency
reference signal
Prior art date
Application number
PCT/US2017/051375
Other languages
English (en)
Inventor
Yushu Zhang
Yuan Zhu
Wenting CHANG
Ralf Bendlin
Seunghee Han
Seok Chul Kwon
Alexei Davydov
Hong He
Original Assignee
Intel IP Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel IP Corporation filed Critical Intel IP Corporation
Publication of WO2018053009A1 publication Critical patent/WO2018053009A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0096—Indication of changes in allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation

Definitions

  • Wireless or mobile communication involves wireless communication between two or more devices.
  • the communication requires resources to transmit data from one device to another and/or to receive data at one device from another.
  • Wireless communication typically has limited resources in terms of time and frequency.
  • the utilization of these limited resources can impact communication data rate, reliability, latency and the like. Underutilization of these resources can occur, thereby degrading communication, reliability, data rate and the like. Additionally, higher data rates are increasingly used or required for wireless communication.
  • One technique to improve resource utilization and facilitate communications is to employ reference signals.
  • the reference signals can facilitate selection of resources for communication.
  • a device can use received reference signals to estimate
  • the estimated properties are then used to select channels for communication. Further, the reference signals can be used for channel estimation and decoding.
  • FIG. 1 illustrates a block diagram of an example wireless communications network environment for a network device (e.g., a UE or an eNB) according to various aspects or embodiments.
  • FIG. 2 illustrates another block diagram of an example of wireless communications network environment for a network device (e.g., a UE or an eNB) according to various aspects or embodiments.
  • FIG. 3 another block diagram of an example of wireless communications network environment for network device (e.g., a UE or an eNB) with various interfaces according to various aspects or embodiments.
  • network device e.g., a UE or an eNB
  • FIG. 4 is a diagram illustrating an architecture of a system using reference signals (RSs) for mobile communications in accordance with some embodiments.
  • RSs reference signals
  • FIG. 5A is a diagram illustrating a baseline DM-RS pattern for a DM-RS in accordance with some embodiments.
  • FIG. 5B is a diagram illustrating an increased density DM-RS pattern in accordance with some embodiments.
  • FIG. 5C is a diagram illustrating reduced density DM-RS pattern in accordance with some embodiments.
  • FIG. 6A is a diagram illustrating a first DM-RS pattern for a DM-RS in accordance with some embodiments.
  • FIG. 6B is a diagram illustrating a shifted DM-RS pattern in accordance with some embodiments.
  • FIG. 6C is a diagram illustrating a shifted DM-RS pattern in accordance with some embodiments.
  • FIG. 7 is a diagram illustrating a shifted DM-RS pattern in accordance with some embodiments.
  • FIG. 8A is a diagram illustrating a first DM-RS pattern in accordance with some embodiments.
  • FIG. 8B is a diagram illustrating a second DM-RS pattern in accordance with some embodiments.
  • FIG. 9 is a table illustrating suitable parameters for a DM-RS pattern in accordance with some embodiments.
  • FIG. 10A is a diagram illustrating CRS patterns or subframes in accordance with some embodiments.
  • FIG. 10B is a diagram illustrating CRS patterns or subframes in accordance with some embodiments.
  • FIG. 1 1 is a diagram illustrating a CRS patterns or subframes for an antenna port in accordance with some embodiments.
  • FIG. 12 is a diagram illustrating a CRS patterns or subframes for another antenna port in accordance with some embodiments.
  • FIG. 13 is a diagram illustrating a CRS patterns or subframes for another antenna port in accordance with some embodiments.
  • FIG. 14A is a diagram illustrating a DM-RS patterns or subframes in accordance with some embodiments.
  • FIG. 14B is a diagram illustrating additional DM-RS patterns or subframes in accordance with some embodiments.
  • FIG. 15 is a table illustrating examples of suitable bandwidth partitions in accordance with some embodiments.
  • FIG. 16 is a diagram illustrating an SH-RS pattern or structure having varied restrictions in a time domain in accordance with some embodiments.
  • FIG. 17 is a diagram illustrating subframes or transmissions having BRS in accordance with some embodiments.
  • FIG. 18 is a diagram illustrating subframes or transmissions having BRS for decoding in accordance with some embodiments.
  • FIG. 19 is a diagram illustrating search spacing using BRS in accordance with some embodiments.
  • ком ⁇ онент can be a processor, a process running on a processor, a controller, an object, an executable, a program, a storage device, and/or a computer with a processing device.
  • an application running on a server and the server can also be a component.
  • One or more components can reside within a process, and a component can be localized on one computer and/or distributed between two or more computers.
  • a set of elements or a set of other components can be described herein, in which the term "set” can be interpreted as "one or more.”
  • these components can execute from various computer readable storage media having various data structures stored thereon such as with a module, for example.
  • the components can communicate via local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a component can be an apparatus with specific
  • a component can be an apparatus that provides specific functionality through electronic components without mechanical parts; the electronic components can include one or more processors therein to execute software and/or firmware that confer(s), at least in part, the functionality of the electronic components.
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware.
  • Wireless/mobile communication typically has limited resources in terms of time and frequency. The utilization of these limited resources can impact
  • One technique to improve resource utilization is to employ reference signals that allow devices to determine and select resources.
  • the reference signals can be used for beamforming, channel estimation, decoding of received data, and the like.
  • Dual layer beamforming based transmission mode 8 is used in LTE Rel. 9.
  • PDSCH physical downlink shared channel
  • DMRSs demodulation reference signals
  • DM-RS demodulation reference signals
  • One DMRS port is precoded using the same precoder as its associated PDSCH layer.
  • MU multi user
  • MIMO multiple input multiple output
  • transparent MU- MIMO is supported because DMRS overhead does not change with the increase of MU- MIMO transmission rank.
  • four rank one users/devices can be served in one MU-MIMO transmission.
  • transmission mode 9 extends the DMRS structure of TM8 to support up to rank eight single user (SU)-MIMO transmission. But for MU- MIMO, TM9 simply keeps the same MU-MIMO transmission order as TM8.
  • Two DMRS ports ⁇ 1 1 , 13 ⁇ are added to the same 12 REs of DMRS ports ⁇ 7, 8 ⁇ using length four orthogonal cover code.
  • the second group of 12 REs are reserved for the other four DMRS ports ⁇ 9, 10, 12, 14 ⁇ . When the transmission rank is greater than 2, both DMRS groups are used.
  • TM10 keeps the same DMRS structure as TM9.
  • RRC radio resource control
  • the nSCID signaling in DCI Format 2D will dynamically choose one of the virtual cell ID to initialize the DMRS sequence for a given PDSCH transmission.
  • the DM-RS antenna ports which are used for PDSCH transmission are indicated in the DCI Formats 2C and 2D using 3bit "Antenna port(s), scrambling identity and number of layers indication" field, which are decoded.
  • reference signals can support demodulation of physical channels such as a data channel and a control channel.
  • the RS can be classified as UE specific and non-UE specific.
  • the non-UE specific can include cell-specific reference signal (CRS) and DM-RS for enhanced physical downlink control channel (EPDCCH).
  • CRS cell-specific reference signal
  • EPDCCH enhanced physical downlink control channel
  • the CRS can be used for demodulation of data and control channels while the DM-RS are used for demodulation of an enhanced control channel, such as the EPDCCH.
  • the embodiments include generating, adjusting and using DM-RS patterns to facilitate channel estimation.
  • the reference signals can include one or more cell specific reference signals (CRSs), shared reference signals (SHRSs), demodulation reference signals (DM-RSs), beam reference signals (BRSs), multiple BRSs, TRSs, and the like.
  • CRSs cell specific reference signals
  • SHRSs shared reference signals
  • DM-RSs demodulation reference signals
  • BRSs beam reference signals
  • TRSs multiple BRSs, TRSs, and the like.
  • FIG. 1 illustrates an architecture of a system 100 of a network in accordance with some embodiments.
  • the system 100 is shown to include a user equipment (UE) 101 and a UE 102.
  • the UEs 101 and 1 02 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks), but can also comprise any mobile or non-mobile computing device, such as Personal Data Assistants (PDAs), pagers, laptop computers, desktop computers, wireless handsets, or any computing device including a wireless communications interface.
  • PDAs Personal Data Assistants
  • pagers pagers
  • laptop computers desktop computers
  • wireless handsets wireless handsets
  • any of the UEs 101 and 102 can comprise an Internet of Things (loT) UE, which can comprise a network access layer designed for low-power loT applications utilizing short-lived UE connections.
  • An loT UE can utilize technologies such as machine-to-machine (M2M) or machine-type communications (MTC) for exchanging data with an MTC server or device via a public land mobile network (PLMN), Proximity-Based Service (ProSe) or device-to-device (D2D) communication, sensor networks, or loT networks.
  • M2M or MTC exchange of data can be a machine-initiated exchange of data.
  • loT network describes interconnecting loT UEs, which can include uniquely identifiable embedded computing devices (within the Internet infrastructure), with short-lived connections.
  • the loT UEs can execute background applications (e.g., keep-alive messages, status updates, etc.) to facilitate the connections of the loT network.
  • the UEs 101 and 102 can be configured to connect, e.g., communicatively couple, with a radio access network (RAN) 1 10—
  • the RAN 1 10 can be, for example, an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), a NextGen RAN (NG RAN), or some other type of RAN.
  • UMTS Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • NG RAN NextGen RAN
  • the UEs 101 and 102 utilize connections 103 and 104, respectively, each of which comprises a physical communications interface or layer (discussed in further detail below); in this example, the connections 103 and 104 are illustrated as an air interface to enable communicative coupling, and can be consistent with cellular communications protocols, such as a Global System for Mobile Communications (GSM) protocol, a code-division multiple access (CDMA) network protocol, a Push-to-Talk (PTT) protocol, a PTT over Cellular (POC) protocol, a Universal Mobile Telecommunications System (UMTS) protocol, a 3GPP Long Term Evolution (LTE) protocol, a fifth generation (5G) protocol, a New Radio (NR) protocol, and the like.
  • GSM Global System for Mobile Communications
  • CDMA code-division multiple access
  • PTT Push-to-Talk
  • POC PTT over Cellular
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • 5G fifth generation
  • NR New Radio
  • the UEs 101 and 1 02 can further directly exchange communication data via a ProSe interface 105.
  • the ProSe interface 105 can be any suitable ProSe interface 105.
  • a sidelink interface comprising one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Discovery Channel (PSDCH), and a Physical Sidelink Broadcast Channel (PSBCH).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the UE 102 is shown to be configured to access an access point (AP) 106 via connection 107.
  • the connection 107 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.1 1 protocol, wherein the AP 106 would comprise a wireless fidelity (WiFi®) router.
  • WiFi® wireless fidelity
  • the AP 1 06 is shown to be connected to the Internet without connecting to the core network of the wireless system (described in further detail below).
  • the RAN 1 1 0 can include one or more access nodes that enable the connections 1 03 and 104.
  • ANs access nodes
  • BSs base stations
  • NodeBs evolved NodeBs
  • gNB next Generation NodeBs
  • RAN nodes and so forth, and can comprise ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell).
  • a network device as referred to herein can include any one of these APs, ANs, UEs or any other network component.
  • the RAN 1 10 can include one or more RAN nodes for providing macrocells, e.g., macro RAN node 1 1 1 , and one or more RAN nodes for providing femtocells or picocells (e.g., cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells), e.g., low power (LP) RAN node 1 12.
  • RAN nodes for providing macrocells e.g., macro RAN node 1 1 1
  • femtocells or picocells e.g., cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells
  • LP low power
  • any of the RAN nodes 1 1 1 and 1 12 can terminate the air interface protocol and can be the first point of contact for the UEs 101 and 102.
  • any of the RAN nodes 1 1 1 and 1 12 can fulfill various logical functions for the RAN 1 1 0 including, but not limited to, radio network controller (RNC) functions such as radio bearer management, uplink (UL) and downlink (DL) dynamic radio resource
  • RNC radio network controller
  • the UEs 101 and 102 can be configured to communicate using Orthogonal Frequency-Division Multiplexing (OFDM) communication signals with each other or with any of the RAN nodes 1 1 1 and 1 1 2 over a multicarrier communication channel in accordance various communication techniques, such as, but not limited to, an Orthogonal Frequency-Division Multiple Access (OFDMA) communication technique (e.g., for downlink communications) or a Single Carrier Frequency Division Multiple Access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications), although the scope of the embodiments is not limited in this respect.
  • OFDM signals can comprise a plurality of orthogonal subcarriers.
  • a downlink resource grid can be used for downlink transmissions from any of the RAN nodes 1 1 1 and 1 12 to the UEs 101 and 1 02, while uplink transmissions can utilize similar techniques.
  • the grid can be a time-frequency grid, called a resource grid or time-frequency resource grid, which is the physical resource in the downlink in each slot.
  • a time-frequency plane representation is a common practice for OFDM systems, which makes it intuitive for radio resource allocation.
  • Each column and each row of the resource grid corresponds to one OFDM symbol and one OFDM subcarrier, respectively.
  • the duration of the resource grid in the time domain corresponds to one slot in a radio frame.
  • the smallest time-frequency unit in a resource grid is denoted as a resource element.
  • Each resource grid comprises a number of resource blocks, which describe the mapping of certain physical channels to resource elements.
  • Each resource block comprises a collection of resource elements; in the frequency domain, this can represent the smallest quantity of resources that currently can be allocated.
  • the physical downlink shared channel can carry user data and higher-layer signaling to the UEs 101 and 102.
  • the physical downlink control channel (PDCCH) can carry information about the transport format and resource allocations related to the PDSCH channel, among other things. It can also inform the UEs 101 and 102 about the transport format, resource allocation, and H-ARQ (Hybrid Automatic Repeat Request) information related to the uplink shared channel.
  • downlink scheduling assigning control and shared channel resource blocks to the UE 102 within a cell
  • the downlink resource assignment information can be sent on the PDCCH used for (e.g., assigned to) each of the UEs 101 and 1 02.
  • the PDCCH can use control channel elements (CCEs) to convey the control information.
  • CCEs control channel elements
  • the PDCCH complex-valued symbols can first be organized into quadruplets, which can then be permuted using a sub-block interleaver for rate matching.
  • Each PDCCH can be transmitted using one or more of these CCEs, where each CCE can correspond to nine sets of four physical resource elements known as resource element groups (REGs).
  • RAGs resource element groups
  • QPSK Quadrature Phase Shift Keying
  • the PDCCH can be transmitted using one or more CCEs, depending on the size of the downlink control information (DCI) and the channel condition.
  • DCI downlink control information
  • There can be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation level, L 1 , 2, 4, or 8).
  • Some embodiments can use concepts for resource allocation for control channel information that are an extension of the above-described concepts.
  • some embodiments can utilize an enhanced physical downlink control channel (EPDCCH) that uses PDSCH resources for control information transmission.
  • the EPDCCH can be transmitted using one or more enhanced the control channel elements (ECCEs). Similar to above, each ECCE can correspond to nine sets of four physical resource elements known as an enhanced resource element groups (EREGs). An ECCE can have other numbers of EREGs in some situations.
  • EPCCH enhanced physical downlink control channel
  • ECCEs enhanced the control channel elements
  • each ECCE can correspond to nine sets of four physical resource elements known as an enhanced resource element groups (EREGs).
  • EREGs enhanced resource element groups
  • An ECCE can have other numbers of EREGs in some situations.
  • the RAN 1 1 0 is shown to be communicatively coupled to a core network (CN) 1 20— via an S1 interface 1 1 3.
  • the CN 120 can be an evolved packet core (EPC) network, a NextGen Packet Core (NPC) network, or some other type of CN.
  • EPC evolved packet core
  • NPC NextGen Packet Core
  • the S1 interface 1 13 is split into two parts: the S1 -U interface 1 14, which carries traffic data between the RAN nodes 1 1 1 and 1 12 and the serving gateway (S-GW) 122, and the S1 -mobility management entity (MME) interface 1 15, which is a signaling interface between the RAN nodes 1 1 1 and 1 12 and MMEs 121 .
  • MME mobility management entity
  • the CN 1 20 comprises the MMEs 121 , the S-GW 122, the Packet Data Network (PDN) Gateway (P-GW) 123, and a home subscriber server (HSS) 124.
  • the MMEs 121 can be similar in function to the control plane of legacy Serving General Packet Radio Service (GPRS) Support Nodes (SGSN).
  • GPRS General Packet Radio Service
  • the MMEs 121 can manage mobility aspects in access such as gateway selection and tracking area list management.
  • the HSS 124 can comprise a database for network users, including subscription-related information to support the network entities' handling of
  • the CN 120 can comprise one or several HSSs 124, depending on the number of mobile subscribers, on the capacity of the equipment, on the organization of the network, etc.
  • the HSS 124 can provide support for routing/roaming, authentication, authorization, naming/addressing resolution, location dependencies, etc.
  • the S-GW 122 can terminate the S1 interface 1 13 towards the RAN 1 1 0, and routes data packets between the RAN 1 10 and the CN 120.
  • the S-GW 122 can be a local mobility anchor point for inter-RAN node handovers and also can provide an anchor for inter-3GPP mobility. Other responsibilities can include lawful intercept, charging, and some policy enforcement.
  • the P-GW 123 can terminate an SGi interface toward a PDN.
  • the P-GW 123 can route data packets between the CN network 120 and external networks such as a network including the application server 130 (alternatively referred to as application function (AF)) via an Internet Protocol (IP) interface 125.
  • the application server 130 can be an element offering applications that use IP bearer resources with the core network (e.g., UMTS Packet Services (PS) domain, LTE PS data services, etc.).
  • PS UMTS Packet Services
  • LTE PS data services etc.
  • the P-GW 123 is shown to be communicatively coupled to an application server 130 via an IP communications interface 125.
  • the application server 130 can also be configured to support one or more communication services (e.g., Voice-over-Internet Protocol (VoIP) sessions, PTT sessions, group communication sessions, social networking services, etc.) for the UEs 1 01 and 102 via the CN 120.
  • VoIP Voice-over-Internet Protocol
  • PTT sessions PTT sessions
  • group communication sessions social networking services, etc.
  • the P-GW 123 can further be a node for policy enforcement and charging data collection.
  • Policy and Charging Enforcement Function (PCRF) 126 is the policy and charging control element of the CN 120.
  • PCRF Policy and Charging Enforcement Function
  • HPLMN Home Public Land Mobile Network
  • IP-CAN Internet Protocol Connectivity Access Network
  • HPLMN Home Public Land Mobile Network
  • V-PCRF Visited PCRF
  • VPLMN Visited Public Land Mobile Network
  • the PCRF 126 can be communicatively coupled to the application server 130 via the P-GW 123.
  • the application server 130 can signal the PCRF 1 26 to indicate a new service flow and select the appropriate Quality of Service (QoS) and charging parameters.
  • the PCRF 126 can provision this rule into a Policy and Charging Enforcement Function (PCEF) (not shown) with the appropriate traffic flow template (TFT) and QoS class of identifier (QCI), which commences the QoS and charging as specified by the application server 130.
  • PCEF Policy and Charging Enforcement Function
  • TFT traffic flow template
  • QCI QoS class of identifier
  • IMS services can be identified more accurately in a paging indication, which can enable the UEs 101 , 102 to differentiate between PS paging and IMS service related paging.
  • the UEs 101 , 102 can apply preferential prioritization for IMS services as desired based on any number of requests by any application, background searching (e.g., PLMN searching or the like), process, or communication.
  • the UEs 1 01 , 102 can differentiate the PS domain paging to more distinguishable categories, so that IMS services can be identified clearly in the UEs 101 , 102 in comparison to PS services.
  • a network e.g., CN 120, RAN 1 10, AP 106, or combination thereof as an eNB or the other network device
  • a network can provide further, more specific information with the TS 36.331 -Paging message, such as a "paging cause" parameter.
  • the UE can use this information to decide whether to respond to the paging, possibly interrupting some other procedure like an ongoing PLMN search.
  • UEs 101 , 102 can be registered to a visited PLMN (VPLMN) and performing PLMN search (i.e., background scan for a home PLMN (HPLMN) or a higher priority PLMN), or when a registered UE is performing a manual PLMN search, the PLMN search can be interrupted in order to move to a connected mode and respond to a paging operation as part of a MT procedure / operation. Frequently, this paging could be for PS data (non-IMS data), where, for example, an application server 130 in the NW wants to push to the UE 101 or 102 for one of the many different applications running in / on the UE 101 or 1 02, for example.
  • PS data non-IMS data
  • a delay in moving to or handover to a preferred PLMN (via manual PLMN search or HPLMN search) in a roaming condition can incur more roaming charges on a user as well.
  • FIG. 2 illustrates example components of a network device 200 in accordance with some embodiments.
  • the device 200 can include application circuitry 202, baseband circuitry 204, Radio Frequency (RF) circuitry 206, front-end module (FEM) circuitry 208, one or more antennas 21 0, and power management circuitry (PMC) 21 2 coupled together at least as shown.
  • the components of the illustrated device 200 can be included in a UE 101 , 102 or a RAN node 1 1 1 , 1 12, AP, AN, eNB or other network component.
  • the device 200 can include less elements (e.g., a RAN node can not utilize application circuitry 202, and instead include a processor/controller to process IP data received from an EPC).
  • the network device 200 can include additional elements such as, for example, memory/storage, display, camera, sensor, or input/output (I/O) interface.
  • the components described below can be included in more than one device (e.g., said circuitries can be separately included in more than one device for Cloud-RAN (C-RAN) implementations).
  • the baseband circuitry 204 can include one or more audio digital signal processor(s) (DSP) 204F.
  • the audio DSP(s) 204F can be include elements for compression/decompression and echo cancellation and can include other suitable processing elements in other embodiments.
  • Components of the baseband circuitry can be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some embodiments.
  • some or all of the constituent components of the baseband circuitry 204 and the application circuitry 202 can be implemented together such as, for example, on a system on a chip (SOC).
  • SOC system on a chip
  • the baseband circuitry 204 can provide for example, on a system on a chip (SOC).
  • RF circuitry 206 can enable communication with wireless networks
  • the receive signal path of the RF circuitry 206 can include mixer circuitry 206a, amplifier circuitry 206b and filter circuitry 206c.
  • the transmit signal path of the RF circuitry 206 can include filter circuitry 206c and mixer circuitry 206a.
  • RF circuitry 206 can also include synthesizer circuitry 206d for synthesizing a frequency for use by the mixer circuitry 206a of the receive signal path and the transmit signal path.
  • the mixer circuitry 206a of the receive signal path can be configured to down-convert RF signals received from the FEM circuitry 208 based on the synthesized frequency provided by synthesizer circuitry 206d.
  • the amplifier circuitry 206b can be configured to amplify the down- converted signals and the filter circuitry 206c can be a low-pass filter (LPF) or bandpass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals.
  • Output baseband signals can be provided to the baseband circuitry 204 for further processing.
  • the output baseband signals can be zero-frequency baseband signals, although this is not a requirement.
  • mixer circuitry 206a of the receive signal path can comprise passive mixers, although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 206a of the transmit signal path can be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry 206d to generate RF output signals for the FEM circuitry 208.
  • the baseband signals can be provided by the baseband circuitry 204 and can be filtered by filter circuitry 206c.
  • the synthesizer circuitry 206d can be a fractional-N synthesizer or a fractional N/N+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers can be suitable.
  • synthesizer circuitry 206d can be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider.
  • the synthesizer circuitry 206d can be configured to synthesize an output frequency for use by the mixer circuitry 206a of the RF circuitry 206 based on a frequency input and a divider control input.
  • the synthesizer circuitry 206d can be a fractional N/N+1 synthesizer.
  • frequency input can be provided by a voltage controlled oscillator (VCO), although that is not a requirement.
  • VCO voltage controlled oscillator
  • Divider control input can be provided by either the baseband circuitry 204 or the applications processor 202 depending on the desired output frequency.
  • a divider control input (e.g., N) can be determined from a look-up table based on a channel indicated by the applications processor 202.
  • Synthesizer circuitry 206d of the RF circuitry 206 can include a divider, a delay-locked loop (DLL), a multiplexer and a phase accumulator.
  • the divider can be a dual modulus divider (DMD) and the phase accumulator can be a digital phase accumulator (DPA).
  • the DMD can be configured to divide the input signal by either N or N+1 (e.g., based on a carry out) to provide a fractional division ratio.
  • the DLL can include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip- flop.
  • the delay elements can be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line.
  • Nd is the number of delay elements in the delay line.
  • the FEM circuitry 208 can include a TX/RX switch to switch between transmit mode and receive mode operation.
  • the FEM circuitry can include a receive signal path and a transmit signal path.
  • the receive signal path of the FEM circuitry can include an LNA to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 206).
  • the transmit signal path of the FEM circuitry 208 can include a power amplifier (PA) to amplify input RF signals (e.g., provided by RF circuitry 206), and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas 210).
  • PA power amplifier
  • FIG. 2 shows the PMC 212 coupled only with the baseband circuitry 204.
  • the PMC 2 12 can be additionally or alternatively coupled with, and perform similar power management operations for, other components such as, but not limited to, application circuitry 202, RF circuitry 206, or FEM 208.
  • the PMC 212 can control, or otherwise be part of, various power saving mechanisms of the device 200. For example, if the device 200 is in an RRC_Connected state, where it is still connected to the RAN node as it expects to receive traffic shortly, then it can enter a state known as Discontinuous Reception Mode (DRX) after a period of inactivity. During this state, the device 200 can power down for brief intervals of time and thus save power.
  • DRX Discontinuous Reception Mode
  • the device 200 can transition off to an RRCJdle state, where it disconnects from the network and does not perform operations such as channel quality feedback, handover, etc.
  • the device 200 goes into a very low power state and it performs paging where again it periodically wakes up to listen to the network and then powers down again.
  • the device 200 does not receive data in this state, in order to receive data, it transitions back to RRC_Connected state.
  • An additional power saving mode can allow a device to be unavailable to the network for periods longer than a paging interval (ranging from seconds to a few hours). During this time, the device can be unreachable to the network and can power down completely. Any data sent during this time can incur a large delay with the delay presumed to be acceptable.
  • Processors of the application circuitry 202 and processors of the baseband circuitry 204 can be used to execute elements of one or more instances of a protocol stack.
  • processors of the baseband circuitry 204 alone or in combination, can be used execute Layer 3, Layer 2, or Layer 1 functionality, while processors of the application circuitry 204 can utilize data (e.g., packet data) received from these layers and further execute Layer 4 functionality (e.g., transmission communication protocol (TCP) and user datagram protocol (UDP) layers).
  • Layer 3 can comprise a radio resource control (RRC) layer, described in further detail below.
  • RRC radio resource control
  • Layer 2 can comprise a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer, described in further detail below.
  • Layer 1 can comprise a physical (PHY) layer of a UE/RAN node.
  • PHY physical
  • the memory 204G can comprise one or more machine-readable medium / media including instructions that, when performed by a machine or component herein cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to embodiments and examples described herein. It is to be understood that aspects described herein can be implemented by hardware, software, firmware, or any combination thereof. When implemented in software, functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium (e.g., the memory described herein or other storage device).
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • the device 200 can be configured to connect or include multiple subscriber identity / identification module (SIM) cards / components, referred to as dual SIM or multi SIM devices.
  • SIM subscriber identity / identification module
  • the device 200 can operate with a single transmit and receive component that can coordinate between the different identities from which the SIM components are operating. As such, an incoming voice call should be responded to as fast as possible, while only an incoming packet for an application could be relatively ignored in order to utilize resources for the other identity (e.g., the voice call or SIM component) that is more important or has a higher priority from a priority list / data set / or set of user device preferences, for example.
  • a MT IMS voice call can be interpreted as "data" call as indicated in MT paging message and can be preceded by MT Circuit Switched (CS) paging of an other network or MO CS call initiated by user at same time.
  • CS Circuit Switched
  • a network device e.g., an eNB or access point
  • IMS and non-IMS services could use 4 and 5
  • a network that is able to discriminate between different types of IMS services could use 3) instead of 4) to explicitly indicate to the UE that the paging is for an IMS service different from voice/video and SMS.
  • UE may decide to suspend PLMN search only for critical services like incoming voice/video services.
  • the UE 101 , 102, or device 200 can memorize that there was a paging to which it did not respond, and access the network later, when the PLMN search has been completed and the UE decides to stay on the current PLMN. For example, if the reason for the paging was a mobile terminating IMS SMS, the MME can then inform the HSS (e.g., 124) that the UE is reachable again, and the HSS 124 can initiate a signaling procedure which will result in a delivery of the SMS to the UE once resources are more available or less urgent for another operation / application / or category, for example. To this purpose the UE 101 , 102, or 200 could initiate a periodic tau area update (TAU) procedure if the service category in the Paging message indicated "IMS SMS service", for example.
  • TAU periodic tau area update
  • a wireless hardware connectivity interface 31 8 e.g., an interface to send/receive data to/from Near Field Communication (NFC) components, Bluetooth® components (e.g., Bluetooth® Low Energy), Wi-Fi® components, and other communication components
  • a power management interface 320 e.g., an interface to send/receive power or control signals to / from the PMC 21 2.
  • the system 400 can be utilized with the above embodiments and variations thereof, including the system 100 described above.
  • the system 400 is provided as an example and it is appreciated that suitable variations are contemplated.
  • the system 400 includes a network device 401 and a node 402.
  • the device 401 is shown as a UE device and the node 402 is shown as an eNB for illustrative purposes.
  • the UE device 401 can be other network devices, such as Aps, ANs and the like.
  • the eNB 402 can be other nodes or access nodes (ANs), such as BSs, gNB, RAN nodes and the like.
  • ANs access nodes
  • Other network or network devices can be present and interact with the device 401 and/or the node 402.
  • Downlink (DL) transmissions occur from the eNB 402 to the UE 401 whereas uplink (UL) transmissions occur from the UE 401 to the eNB 402.
  • the downlink transmissions utilize a DL control channel and a DL data channel.
  • the uplink transmissions utilize an UL control channel and a UL data channel.
  • the various channels can be different in terms of direction, link to another eNB and the like.
  • the system 400 generates and uses reference signals 403 to facilitate communications between the UE 401 , the eNB 402 and/or other devices.
  • the reference signals 403 can include one or more cell specific reference signals (CRSs), shared reference signals (SHRSs), demodulation reference signals (DM-RSs), beam reference signals (BRSs), multiple BRSs and the like.
  • CRSs cell specific reference signals
  • SHRSs shared reference signals
  • DM-RSs demodulation reference signals
  • BRSs beam reference signals
  • the eNB 402 generates a DM-RS pattern for downlink (DL) communications using the determined one or more pattern adjustments at 404.
  • the DM-RS pattern can be for one antenna port and/or a plurality of antenna ports.
  • the DM-RS pattern can be cell specific.
  • the pattern can also be referred to as a structure, subframe structure, mapping and the like.
  • Pattern information can be provided by the eNB 402 to the UE 401 at 406.
  • the pattern information facilitates channel estimation and the like at the UE 401 by providing information/location of reference signals in downlink transmission.
  • the pattern information can also include cell identity (ID), virtual cell ID and the like.
  • the pattern information is provided using a DCI.
  • the pattern information is provided using radio resource control (RRC) signalling.
  • RRC radio resource control
  • the eNB 402 generates a downlink (DL) transmission using the DM-RS pattern at 408.
  • the UE 401 receives the downlink transmission via an RF interface.
  • the DL transmission us a PDSCH.
  • the UE 401 obtains reference signals, including pilot signals, using the DM- RS pattern and the pattern information. The obtained reference signals can then be used for channel estimation at 410.
  • the DL transmission is demodulated at 412 using the channel estimation from 410.
  • the UE can also generate an uplink (UL) DM-RS pattern for an UL
  • the UL DM-RS pattern can also be based on one or more pattern adjustments, which are based on pattern properties as shown above.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • the time is shown in OFDM symbols.
  • Each block is a resource element (RE) having time and frequency resources.
  • DM-RS resource elements (REs) 510 for antenna ports 0 and 1 are arranged as shown in the baseline pattern 500.
  • DM-RS REs 51 2 for antenna ports 2 and 3 are arranged as shown in the baseline pattern 500.
  • FIG. 5B is a diagram illustrating an increased density DM-RS pattern 501 in accordance with some embodiments.
  • the pattern 501 supports four (4) antenna ports, however it is appreciated that the pattern 501 can be extended to larger values.
  • the pattern 501 can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the pattern 501 are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe is depicted with 14 OFDM symbols along the x- axis and 12 subcarriers along the y-axis.
  • the pattern 501 is shown having an increased or second density.
  • DM-RS resource elements (REs) 510 for antenna ports 0 and 1 are arranged as shown in the baseline pattern 501 .
  • DM-RS REs 51 2 for antenna ports 2 and 3 are arranged as shown in the baseline pattern 501 .
  • the pattern 501 includes 1 8 REs for ports 0-1 and 18 REs for ports 2-3. Thus, there are 6 additional REs used for each group of ports.
  • the pattern 501 has been extended from the pattern 500.
  • FIG. 5C is a diagram illustrating reduced density DM-RS pattern 502 in accordance with some embodiments.
  • the pattern 502 supports four (4) antenna ports, however it is appreciated that the pattern 502 can be extended to larger values.
  • the pattern 501 can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the pattern 502 are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe is depicted with 14 OFDM symbols along the x- axis and 12 subcarriers along the y-axis.
  • the pattern 501 is shown having an reduced or third density.
  • the pattern density also referred to as DM-RS density, impacts the efficiency of channel estimation. This includes impacting the efficiency of channel estimation for relatively low signal to noise ratio (SNR) values.
  • SNR signal to noise ratio
  • the baseline pattern 500 is used for 1 -4 MIMO layers, i.e. to allocate 1 2 REs per physical resource block (PRB) for each antenna port.
  • PRB physical resource block
  • the density of the pattern can be reduced and the design can be defined assuming two or more adjacent PRBs.
  • DM-RS patterns can be nested and
  • the actual DM-RS pattern can be configured by a gNB.
  • the configurable/variable pattern density can facilitate MMSE-IRC receives to support accurate interference measurements, such as for 4 antenna port capable UEs.
  • a node such as a eNB or gNB, sets a density for a pattern to be one of a baseline/original, increased from the baseline, or reduced from the baseline, as shown in FIGs. 5A to 5C.
  • FIGs. 6A-6C provide examples of suitable DM-RS patterns having pattern shift to mitigate reference signals collision.
  • the patterns are provided for illustrative purposes and it is appreciated that suitable variations are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe/slot is depicted with 14 OFDM symbol along the x-axis and 12 subcarriers along the y-axis.
  • the pattern 600 is shown having a first pattern.
  • the first two symbols, shown as lightly shaded, are a control channel.
  • the group can be from a single node (eNB, gNB, ...), for a particular cell, and the like.
  • DM-RS resource elements (REs) 610 for antenna ports 0 and 1 are arranged as shown in the first pattern 600. There are 12 REs for ports 0-1 .
  • the arrangement of the REs 61 0 is similar to the arrangement of the REs 51 0, described above.
  • FIG. 6B is a diagram illustrating a shifted DM-RS pattern 601 in accordance with some embodiments.
  • the pattern 601 shows two (2) antenna ports, however it is appreciated that the pattern 601 can be extended to other numbers of antenna ports.
  • the pattern 601 can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the pattern 601 are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe is depicted with 14 OFDM symbol along the x- axis and 12 subcarriers along the y-axis.
  • ports 0 and 1 There are two ports depicted and they are arranged into a first group, ports 0 and 1 .
  • the group can be from a single eNB, for a particular cell, and the like.
  • ⁇ symbol/unit, subcarrier ⁇ are shifted left or earlier from original locations at ⁇ 5,6 ⁇ and ⁇ 5,7 ⁇ .
  • the DM-RS REs located at ⁇ 4,1 ⁇ and ⁇ 4,2 ⁇ have been shifted from ⁇ 3,1 ⁇ and ⁇ 3,2 ⁇ as shown.
  • the DM-RS REs located at ⁇ 5,1 1 ⁇ and ⁇ 5,12 ⁇ have been shifted from ⁇ 4,1 1 ⁇ and ⁇ 4,12 ⁇ as shown.
  • Other shifts are show in the pattern 601 relative to the pattern 600.
  • FIG. 6C is a diagram illustrating a shifted DM-RS pattern 602 in accordance with some embodiments.
  • the pattern 602 shows two (2) antenna ports, however it is appreciated that the pattern 602 can be extended to other numbers of antenna ports.
  • the pattern 602 can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the pattern 602 are contemplated.
  • DM-RS resource elements (REs) 610 for antenna ports 0 and 1 are arranged as shown in the shifted pattern 602. There are 1 2 REs for ports 0-1 .
  • the DM-RS REs located at ⁇ 3,1 1 ⁇ and ⁇ 3,12 ⁇ are shifted left or earlier from original/baseline locations at ⁇ 4,1 1 ⁇ and ⁇ 4, 12 ⁇ . Further, the DM-RS REs located at ⁇ 4,6 ⁇ and ⁇ 4,7 ⁇ have been shifted from ⁇ 5,6 ⁇ and ⁇ 5,7 ⁇ as shown. Also, the DM-RS REs located at ⁇ 5,1 ⁇ and ⁇ 5,2 ⁇ have been shifted from ⁇ 3, 1 ⁇ and ⁇ 3,2 ⁇ as shown. Other shifts are show in the pattern 602 relative to the pattern 600.
  • the shifting of DM-RS REs can be configured to mitigate DM-RS collisions as shown.
  • the shifting can be in terms of frequency and/or time, such as subcarrier(s) and slots.
  • a node such as a eNB or gNB, detects or estimates DM-RS collisions and shifts DM-RS elements from an original or baseline pattern to a new or shifted pattern. The shifted pattern mitigates DM-RS collisions.
  • a subframe is depicted with 14 OFDM symbols along the x- axis and 12 subcarriers along the y-axis.
  • the pattern 700 is shown having a shifted pattern.
  • DM-RS resource elements (REs) 710 for antenna ports 0 and 1 are arranged as shown in the pattern 700. There are 12 REs for ports 0-1 . There are also zero point (ZP) DM-RS Res 71 1 in the pattern 700.
  • ZP zero point
  • At least a portion of the DM-RS REs and/or the ZP DM-RS REs are shifted to mitigate collisions and/or other interference.
  • FIGs. 8A-8B provide examples of suitable DM-RS patterns having varied lengths or TTL lengths.
  • the patterns are provided for illustrative purposes and it is appreciated that suitable variations are contemplated.
  • FIG. 8A is a diagram illustrating a first DM-RS pattern 800 in accordance with some embodiments.
  • the pattern 800 shows four (4) antenna ports, however it is appreciated that the pattern 800 can be extended to other numbers of antenna ports.
  • the pattern 800 can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the pattern 800 are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis. The frequency is shown in units, such as subcarrier spacing. The time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe is depicted with 10 OFDM symbol, instead of 14, along the x-axis and 12 subcarriers along the y-axis.
  • the group can be from a single eNB, for a particular cell, and the like.
  • DM-RS resource elements (REs) 810 for antenna ports 0 and 1 are arranged as shown in the first pattern 800. There are 12 REs for ports 0-1 .
  • DM-RS resource elements (REs) 81 1 for antenna ports 2 and 3 are arranged as shown in the first pattern 800.
  • the subframe has been reduced from 14 OFDM symbols to 1 0 OFDM symbols.
  • OFMD symbols 3 and 4 are not present or omitted in pattern 802.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) having time and frequency resources.
  • RE resource element
  • a subframe/slot is depicted with 8 OFDM symbols, instead of 14, along the x-axis and 1 2 subcarriers along the y-axis.
  • the pattern 801 is shown having a first pattern.
  • ports 0 and 1 There are two ports depicted and they are arranged into a first group, ports 0 and 1 .
  • the group can be from a single eNB, for a particular cell, and the like.
  • DM-RS resource elements (REs) 810 for antenna ports 0 and 1 are arranged as shown in the first pattern 800. There are 6 REs for ports 0-1 and 6 REs for ports 2-3. DM-RS resource elements (REs) 81 1 for antenna ports 2 and 3 are arranged as shown in the first pattern 800.
  • Information relating to the pattern for DM-RS is typically indicated by a node to one or more UE.
  • the information is generated within a DCI.
  • the node can configure or adjust the pattern by adjusting density, spacing, extrapolation, interpolation, patter shifting, power boosting, flexible durations and the like.
  • the DM-RS REs spacing affects the performance of channel estimation.
  • the optimal DM-RS REs spacing in time domain and frequency domain depends on the channel parameters, such as Doppler spread and delay spread.
  • a DM-RS spacing in time domain limited of no more than 3 OFDM symbols and no more than 6 subcarriers in the frequency domain similar can be used. Localized transmission of the DM-RS REs in time domain can reduce processing time associated with buffering of the received channel for channel estimation.
  • DM-RS REs can be located near or at the PRB boundaries either in time or frequency.
  • DM-RS REs can be located near OFDM symbols 1 or 12 and near subcarriers 1 or 1 1 .
  • the orthogonal property of pilots used in each TRP can be used to enhance accuracy of channel estimation.
  • DM-RS collisions can be mitigated by configuring DM-RS shifts, e.g. in time or frequency domain.
  • advanced receiver operation can be supported by relying on the channel estimation for neighbouring TRP and MU-MIMO with orthogonal DM-RS antenna port support of ZP DM-RS.
  • the DM-RS pattern shift and ZP DM-RS can be signalled in downlink control signalling.
  • a UE can perform PDSCH and PUSCH rate matching around ZP and NZP DM-RS.
  • DM-RS can support power boosting and de-boosting to achieve or improve the trade-off between channel estimation efficiency and data channel performance.
  • support of the collided DM-RS REs offset the power boosting gains. Therefore, configurable DM-RS REs shift should be supported.
  • DM-RS pattern should support DM-RS transmission in each of OFDM symbols within PRB.
  • the power boosting signalling can be transparent for QPSK modulation and can be signalled to the UE for higher order modulation. In this case UE should scale the estimated channel using this information prior to demodulation of the data channel.
  • the PDSCH-start and PDSCH-end can be relatively flexible and indicated to the UE to support control signalling transmission, guard interval, CSI-RS or SRS signals, and the like.
  • the DM-RS pattern can be adjusted to accommodate changes in downlink subframe duration. In this invention the following options for DM-RS pattern modification are proposed.
  • FIGs. 8A and 8B show adjustments to patterns to
  • Some additional modifications or adjustments to the patterns include deletion of the OFDM symbols without DM-RS, puncturing some of the DM-RS Res, and the like.
  • DM-RS patterns can be adjusted to support TxD scheme relying on SFBC precoding. Orphaned REs can be mitigated or avoided in by a resource allocation and DM-RS pattern that has an even number of REs in OFDM symbols.
  • FIG. 9 is a table 900 illustrating suitable parameters for a DM-RS pattern in accordance with some embodiments.
  • the parameters are provided for illustrative purposes and it is appreciated that suitable variations are contemplated.
  • the table 900 includes a channel starting symbol, a channel ending symbol, a number of symbol groups and a symbol group spacing as shown.
  • the parameters can be specified for uplink or downlink data/shared channels, in one example.
  • FIGs. 10A, 10B, 1 1 , 12 and 1 3 depict CRS examples of suitable patterns or subframes for various antenna ports. These are provided for illustrative purposes and it is appreciated that suitable variations are contemplated. In this example, there are four (4) antenna ports, however it is appreciated that other numbers of antenna ports are contemplated. [00197] FIGs. 10A and 10B depict CRS patterns for antenna port 0.
  • FIG. 10A is a diagram illustrating a CRS patterns or subframes in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) or reference symbol having time and frequency resources.
  • RE resource element
  • a single RE or reference symbol can be referenced by (k,f), where k is a slot/symbol and / is a subcarrier.
  • a cell specific reference signal is a reference signal typically
  • the CRS uses CRS resource(s), which can occupy entire frequency bands.
  • a UE device uses the CRS to estimate the downlink channel and to remove the effect of the channel in the received signal.
  • the CRS can be transmitted with a power offset relative to a data channel and a control channel that is configured for the UE device.
  • the power is broadcast to the UE and/or other UEs using system information block (SIB) messages, in one example.
  • SIB system information block
  • the CRS are transmitted on OFDM symbols 0, 4, 7 ,1 1 of all downlink subframes in FDD.
  • the CRS can be a QPSK modulated using pseudo-noise sequence.
  • a first pattern 1 000 is a scenario where there is one antenna port, the antenna port 0.
  • the antenna port is available to transmitting at any of the resource elements (REs) shown in the figure.
  • the REs 1 010 allocated for the CRS pattern are shown in the upper portion of the figure.
  • a second pattern 1001 is shown in a lower portion of the figure and is a scenario where there are two antenna ports.
  • the antenna port 0 is not transmitting on REs indicated by 101 1 , possibly because another antenna port is transmitting using these REs.
  • the CRS allocated REs 1010 remain suitable in that they are not blocked or impacted by the non-transmitting REs 101 1 .
  • FIG. 10B continues the examples of FIG. 10A and includes a third CRS pattern 1002. In this scenario, there are four antenna ports and the antenna port 0 is not able to transmit using REs as indicated by 101 1 .
  • the CRS allocated REs 101 0 are shown.
  • FIG. 1 1 is a diagram illustrating a CRS patterns or subframes for an antenna port in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated. This example is provided relative to antenna port 1 .
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) or reference symbol having time and frequency resources.
  • the symbols are 14 symbols, in this example.
  • a single RE or reference symbol can be referenced by (k,l), where k is a slot/symbol and / is a subcarrier.
  • a first pattern 1 101 is shown in an upper portion of the figure and is a scenario where the antenna port 1 is not able to transmit using REs indicated by 1 01 1 .
  • the antenna port 0 is transmitting CRS as shown in FIG. 10A, thus the REs are not available.
  • the CRS allocated REs 1 1 10 are not substantially blocked or impacted by the non-transmitting REs 1 01 1 .
  • a second CRS pattern 1 103 is shown in a lower portion of the figure. In this scenario, there are three antenna ports. Thus, there are more unavailable REs as indicated by 1 01 1 . The CRS allocated REs 1 1 10 for antenna port 1 are as shown.
  • FIG. 12 is a diagram illustrating a CRS patterns or subframes for another antenna port in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated. This example is provided relative to antenna port 2.
  • a pattern 1203 is shown and is a scenario where the antenna port 2 is not able to transmit using REs indicated by 101 1 .
  • the antenna port 0 is transmitting CRS as shown in FIG. 10A, thus the REs are not available and the antenna port 1 is transmitting CRS as shown in FIG. 1 1 .
  • the CRS allocated REs 1210 are not substantially blocked or impacted by the non-transmitting REs 101 1 .
  • FIG. 13 is a diagram illustrating a CRS patterns or subframes for another antenna port in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated. This example is provided relative to antenna port 3.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) or reference symbol having time and frequency resources.
  • a single RE or reference symbol can be referenced by (k,l), where k is a slot/symbol and / is a subcarrier.
  • a pattern 1303 is shown and is a scenario where the antenna port 3 is not able to transmit using REs indicated by 101 1 .
  • the antenna port 0 is transmitting CRS as shown in FIG. 10A
  • the antenna port 1 is transmitting CRS as shown in FIG. 1 1
  • the antenna port 2 is transmitting CRS as shown in FIG. 12.
  • the CRS allocated REs 1310 are not substantially blocked or impacted by the non- transmitting REs 1 01 1 .
  • FIGs. 14A and 14B depict DM-RS examples of suitable patterns or subframes for various antenna ports. These patterns, also referred to as structures, can be used for downlink control channels, physical downlink control channel (PDCCH), enhanced physical downlink control channel (EPDCCH) and the like. These are provided for illustrative purposes and it is appreciated that suitable variations are contemplated. In this example, there are four (4) antenna ports, however it is appreciated that other numbers of antenna ports are contemplated. [00216] In this example, the DM-RS patterns are provided for antenna ports 7, 8, 9, and 10 of the PDSCH and can be used by multiple UE devices for demodulation of the EPDCCH. Multiple PRBs that contain DM-RS REs can be allocated to the UE devices using higher layer signaling. The UE devices perform control channel demodulation using the (configured/adjusted) DM-RS.
  • DM-RS patterns are provided for antenna ports 7, 8, 9, and 10 of the PDSCH and can be used by multiple UE devices for demodul
  • FIG. 14A is a diagram illustrating a DM-RS patterns or subframes in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the frequency is shown in units, such as subcarrier spacing.
  • the time can be in slots, symbols, OFDM symbols and the like.
  • Each block is a resource element (RE) or reference symbol having time and frequency resources.
  • RE resource element
  • a single RE or reference symbol can be referenced by (k,f), where k is a slot/symbol and / is a subcarrier.
  • a first pattern 1401 is associated with or for antenna port 7, in this example.
  • REs 1410 are allocated for the DM-RS.
  • the first pattern 1401 is shown in the upper portion of the figure.
  • a second pattern 1402 is associated with or for antenna port 8 in this example.
  • REs 141 1 are allocated for the DM-RS for the antenna port 8.
  • the second pattern is shown in the lower portion of the figure.
  • FIG. 14B is a diagram illustrating additional DM-RS patterns in accordance with some embodiments.
  • the patterns can be used with systems, such as systems 100 and 400, described above. It is appreciated that suitable variations of the patterns are contemplated.
  • a third pattern 1403 is associated with or for antenna port 9, in this example.
  • REs 1412 are allocated for the DM-RS.
  • the third pattern 1403 is shown in the upper portion of the figure.
  • a fourth pattern 1404 is associated with or for antenna port 10 in this example.
  • REs 141 3 are allocated for the DM-RS for the antenna port 10.
  • the second pattern is shown in the lower portion of the figure.
  • the node 402 can be configured to support shared reference signals (SH-RS) to facilitate efficient transmission of relatively small packets (e.g. control, URLLC) in NR or to improve channel estimation performance in noise/interference limited scenarios.
  • SH-RS shared reference signals
  • a difference of SH-RS comparing to user specific RS is that scheduling parameters typically may not be 'aligned' (e.g. bandwidth) with the transmission of the physical channel.
  • the time domain position of the SH-RS within the sub frame includes transmission on the first OFDM symbols to support low latency channel estimation processing or improve reliability of control channel demodulation if the control channel transmission is performed on the same or adjacent OFDM symbol(s).
  • the higher layer signaling and DCI signaling for shared RS includes frequency domain scheduling information, time domain scheduling information, and PRB bundling assumptions and measurement restrictions in time.
  • the number of antenna ports for SH-RS is a suitable number, such as 1 , 2 or 4.
  • the presence of SH-RS can be decided based on the scheduled transmission schemes. For example if a UE is scheduled using transmit diversity mode, the UE can assume the SH-RS is present and demodulate the data channel using the SH-RS antenna ports. For other examples, e.g. when UE is scheduled in spatial multiplexing mode, the UE should not assume the presence of SH- RS and demodulate the data channel using UE-specific DM-RS.
  • the frequency domain SH-RS allocation is indicated in the basic units denoted as SH-RS subband.
  • Each SH-RS suband comprises the N consecutive PRBs in the frequency domain.
  • the size of resource sub-band can be different depending on the system bandwidth or configured by higher layers.
  • FIG. 15 is a table 1500 illustrating examples of suitable bandwidth partitions in accordance with some embodiments.
  • the table 1 500 illustrates an example of SH- RS sub band.
  • 15KHz and 60KHz are used for primary and secondary partitions, respectively.
  • M 4 and sub-band size is an integer of 4
  • a bitmap is used to indicate an allocated subband used for SH-RS transmission.
  • ⁇ ' indicates that the SH-RS is present in sub-band
  • '0' indicates no allocation of SH-RS in the sub-band
  • allocated subbands for SH-RS transmission are indicated using starting SH-RS subband position and a number of the allocated SH-RS subbands.
  • configured SH-RS bandwidth can be explicitly indicated by a combined resource indicator. For example, if two non- discontinuous SH-RS subbands are configured, where one starts from s 0 to s t - 1, and the other starts from s 2 to s 3 , the explicit indicate index can be given by equation
  • the presence of SH-RS can be determined from a DCI transmitted in a physical control channel (PCCH).
  • PCCH NR is demodulated assuming transmission on the SH-RS antenna ports.
  • the DCI is transmitted using common search space or UE-specific search space.
  • the transmission instance in time domain of NR PCCH can be configured for the UE by higher layers.
  • the UE can assume that a SH-RS is present in a given sub frame (or series of subrames) if CRC check of DCI is not failed and assumes that SH-RS is not present otherwise.
  • the subframes (or slots) for SH-RS transmission can be also configured using RRC (or MAC) signalling.
  • bitmap can further indicate the presence of SH- RS in the series sub frames, e.g. bitmap of ⁇ 1 1 1 1000001 1 1 1 100000' indicates that SH- RS is present in subframe 0-4 and 10-14 and repeated every 20 subframes
  • SH-RSs can be configured with different PRB bundling assumptions, wherein the PRB bundling includes at least 1 PRB or all SH-RS PRBs.
  • PRB bundling include all SH-RS PRBs
  • the physical data channel DCI contains the PMI index that is used for demodulation.
  • the SH-SR can be configured with different measurement restrictions in time domains.
  • the different measurement restriction can support features, such as no measurement restriction in time domain, measurement restriction in time domain with single subframe, and the like.
  • the SH-RS can be transmitted before and/or on the same OFDM symbols as control channels
  • FIG. 16 is a diagram illustrating an SH-RS pattern or structure 1600 having varied restrictions in a time domain in accordance with some embodiments. It is appreciated that suitable variations are contemplated.
  • Time is depicted along an x-axis and frequency is depicted along a y-axis.
  • the pattern 1600 includes SH-RS 1601 , DL control 1602 and data 1 603.
  • the transmission of the SH-RS 1601 is performed on overlapping OFDM symbols of the DL control 1602.
  • an additional symbol for the SH-RSs can be transmitted in the data area 1603 to improve channel estimation performance, such as for high speed UE devices.
  • Higher layer signaling or a DCI can be used to indicate whether the additional symbol is transmitted.
  • the bandwidth of the additional SH-RS can be the same or larger than the bandwidth of the data area 1603.
  • data can be transmitted in more than 1 subframes, such as for a long TTI scheduling mode.
  • the additional symbol can be transmitted in a follow-up or subsequent subframe.
  • a symbol index can be pre-defined, configured by higher layer signaling, and/or indicated by a DCI.
  • the node 402 can also be configured to provide periodic multiple beam reference signals (BRSs) in subframes for a plurality of UE devices, including the UE device 401 .
  • the node 402 can be configured to fall back to provide a single beam reference signal to the UE device 401 based upon a fallback condition.
  • the BRS can be a form of a shared RS (SH-RS).
  • SH-RS shared RS
  • the BRS and the SH-RS can also be or used as/with tracking reference signals (TRSs).
  • TRSs tracking reference signals
  • BRS may not be present at all.
  • the first technique uses BRS for measurement. This includes a measurement for initial beam acquisition and a measurement for beam management after initial access.
  • the node can define the same BRS position/location for both downlink and uplink subframes, so that the UE is not required to distinguish the transmission direction.
  • the BRS can be mapped to a symbol after the PDCCH. Then for a downlink subframe, the BRS can be or include a Guard Period (GP) to reserve more time for PDCCH decoding. For the uplink subframe, the BRS
  • the BRS can be mapped in a first symbol before or preceding the PDCCH.
  • the BRS symbols can be referenced by a BRS symbol index.
  • the BRS symbol index and period of beam re-occurrences can be pre-defined or configured via higher layer signaling or Synchronization Signal (SS) including Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS) and Extended Synchronization Signal (ESS).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • ESS Extended Synchronization Signal
  • the node or base station 402 can generate a BRS mapping to locate or arrange a BRS in a plurality of slots/symbols/subframes. A period for repeating transmission of the BRS is also determined.
  • the slots or subframe(s) are provided for transmission to the UE device 401 .
  • the UE device 401 is configured to perform beam forming and decode downlink data using the BRS.
  • the UE device 401 can be configured to estimate a time and frequency offset.
  • the offset can include a Doppler offset.
  • the offset is based on the BRS, and demodulation, for example, of a PDCCH and a PDSCH can be performed by the UE device 401 based on BRS.
  • the BRS is transmitted by the node 402, and can be transmitted in one slot, two slots, or more than two slots.
  • the BRS mapping locates the BRS in a first symbol(s) before a physical downlink control channel (PDCCH) symbols or as consecutive or distributed symbol(s) after the PDCCH symbols.
  • PDCCH physical downlink control channel
  • the BRS can be a distributed BRS and include a plurality of antenna ports. It is also appreciated that the transmission direction of BRS resources for the BRS can be different.
  • FIG. 17 is a diagram illustrating subframes or transmissions 1700 having BRS in accordance with some embodiments.
  • the subframes 1700 are provided for illustrative purposes and it is appreciated that suitable variations and/or arrangements for subframes are contemplated.
  • the subframes 1700 can be used with the systems 100 and 400 and variations thereof.
  • a downlink transmission or downlink subframe includes a PDCCH, BRS, DMRS (or DM-RS), a PDSCH, a GP and a PUCCH.
  • the BRS is located after the PDCCH and before the DMRS.
  • An uplink transmission or uplink subframe includes a PDCCH, BRS, DMRS and a PUSCH.
  • the BRS is again located after the PDCCH and before the DMRS.
  • a UE device can use the BRS provided in the uplink or downlink transmission as the location in both transmissions/subframes is the same.
  • a Zadoff-Chu sequence can be used for BRS generation and different BRS antenna ports can use different cyclic shifts.
  • an m- sequence can be used for BRS generation and the signal for different antenna ports can be multiplexed in a Frequency Division Multiplexing (FDM) manner or Code Division Multiplexing (CDM) manner where different Orthogonal Cover Codes can be used for different access points (AP)s.
  • Large or max BRS antenna ports can be configured via synchronization signal(s) (SS) including a primary synchronization signal (PSS), secondary synchronization signal (SSS) and extended synchronization signal (ESS) or a physical broadcast channel (PBCH) and/or other control channels or signals.
  • a base sequence can be determined by cell ID, virtual cell ID, BRS ID and/or subframe index.
  • the BRS can additionally be used for channel estimation of a PDCCH and enable a UE to decode the PDCCH by the BRS.
  • the PDCCH can be decoded without additional reference signals, such as a DMRS.
  • FIG. 18 is a diagram illustrating subframes or transmissions 1800 having BRS for decoding in accordance with some embodiments.
  • the subframes 1 800 are provided for illustrative purposes and it is appreciated that suitable variations and/or
  • subframes 1800 can be used with the systems 1 00 and 400 and variations thereof.
  • a downlink transmission or downlink subframe resource mapping includes a BRS, PDCCH, DMRS (or DM-RS), a PDSCH, a GP and a PUCCH.
  • the BRS is located before the PDCCH.
  • An uplink transmission or uplink subframe resource mapping includes a BRS, PDCCH, DMRS and a PUSCH.
  • the BRS is again located before the PDCCH.
  • the BRS can be mapped to a first symbol before the PDCCH because the modulation order for the PDCCH is relatively small, which means the phase noise impact as well as CFO would not be substantial.
  • search spacing can be determined by the number of BRS antenna ports (APs). For example, given N consecutive BRS antenna ports can be one BRS AP group, there can be M BRS AP groups. One UE can search all the M BRS AP groups to decode the PDCCH. The number of CCEs for each AP Group (APG) for each search space can be determined by M.
  • APG AP Group
  • FIG. 19 is a diagram illustrating search spacing 1900 using BRS in accordance with some embodiments.
  • the search spacing 1 900 is provided for illustrative purposes and it is appreciated that suitable variations and/or arrangements for subframes are contemplated.
  • the search spacing 1900 can be used with the systems 100 and 400 and variations thereof.
  • the diagram depicts 2 BRS access point groups denoted as APG 1 and APG 2.
  • a UE device can use the 8 CCEs within the CCE pattern 1902 to obtain the BRS and use the BRS to decode a PDCCH.
  • the CCEs are segmented into a first access point group (APG 1 ) and a second access point group (APG 2).
  • APG 1 first access point group
  • APG 2 second access point group
  • a UE device search CCEs of both access point groups to obtain the BRS and use the BRS to decode a PDCCH.
  • the BRS can be used for decoding.
  • the beam pattern may not reoccur periodically.
  • NW network
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware.
  • processor can refer to substantially any computing processing unit or device including, but not limited to including, single-core processors; single-processors with software multithread execution capability; multi-core processors; multi-core processors with software multithread execution capability; multi-core processors with hardware multithread technology;
  • a processor can refer to an integrated circuit, an application specific integrated circuit, a digital signal processor, a field programmable gate array, a programmable logic controller, a complex programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions and/or processes described herein.
  • Processors can exploit nano-scale architectures such as, but not limited to, molecular and quantum-dot based transistors, switches and gates, in order to optimize space usage or enhance performance of mobile devices.
  • a processor may also be implemented as a combination of computing processing units.
  • memory components or entities embodied in a “memory,” or components including the memory. It is noted that the memory components described herein can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory.
  • nonvolatile memory for example, can be included in a memory, non-volatile memory (see below), disk storage (see below), and memory storage (see below). Further, nonvolatile memory can be included in read only memory, programmable read only memory, electrically programmable read only memory, electrically erasable programmable read only memory, or flash memory.
  • Volatile memory can include random access memory, which acts as external cache memory.
  • random access memory is available in many forms such as synchronous random access memory, dynamic random access memory, synchronous dynamic random access memory, double data rate synchronous dynamic random access memory, enhanced synchronous dynamic random access memory, Synchlink dynamic random access memory, and direct Rambus random access memory.
  • the disclosed memory components of systems or methods herein are intended to include, without being limited to including, these and any other suitable types of memory.
  • Examples can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including instructions that, when performed by a machine cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to embodiments and examples described herein.
  • Example 1 is an apparatus configured to be employed within a base station.
  • the apparatus comprises baseband circuitry which includes a radio frequency (RF) interface and one or more processors.
  • the one or more processors are configured to determine one or more pattern adjustments based on one or more pattern properties, wherein the one or more pattern properties include channel estimation efficiency, data channel performance and accuracy; generate a demodulation reference signal (DM-RS) pattern based on the pattern adjustments; and provide a DM-RS or data for
  • RF radio frequency
  • the apparatus comprises baseband circuitry which includes a radio frequency (RF) interface and one or more processors.
  • the one or more processors are configured to determine one or more pattern adjustments based on one or more pattern properties, wherein the one or more pattern properties include channel estimation efficiency, data channel performance and accuracy; generate a demodulation reference signal (DM-RS) pattern based on the pattern adjustments; and provide a DM-RS or data for
  • DM-RS demodulation reference signal
  • UE user equipment
  • Example 2 includes the subject matter of Example 1 , including or omitting optional elements, where the one or more pattern adjustments include shifting one or more resource elements (REs) in time and/or frequency with respect to a baseline pattern.
  • REs resource elements
  • Example 3 includes the subject matter of any of Examples 1 -2, including or omitting optional elements, where the one or more pattern adjustments include density, wherein the DM-RS pattern has a relatively low density of resource elements allocated for DM-RSs.
  • Example 4 includes the subject matter of any of Examples 1 -3, including or omitting optional elements, where the one or more pattern adjustments include allocating resource elements (REs) near time and/or frequency boundaries of physical resource blocks (PRB).
  • REs resource elements
  • PRB physical resource blocks
  • Example 5 includes the subject matter of any of Examples 1 -4, including or omitting optional elements, where the one or more pattern adjustments include shifting resource elements (REs) to provide efficient power boosting or power de-boosting.
  • Example 6 includes the subject matter of any of Examples 1 -5, including or omitting optional elements, where the one or more pattern adjustments include removing one or more DM-RS symbols to account for subframe or slot duration variations.
  • REs resource elements
  • Example 7 includes the subject matter of any of Examples 1 -6, including or omitting optional elements, where the one or more DM-RS pattern adjustments include transmission of zero power REs that correspond to other reference signals of an other DM-RS pattern.
  • Example 8 includes the subject matter of any of Examples 1 -7, including or omitting optional elements, where the DM-RS is cell specific.
  • Example 10 is an apparatus configured to be employed within a user equipment (UE) device comprising baseband circuitry.
  • the baseband circuitry includes a radio frequency (RF) interface and one or more processors.
  • the one or more processors are configured to receive pattern information from the RF interface, receive downlink data via the RF interface, wherein the downlink data includes a demodulation reference signal (DM-RS) according to the received pattern information, perform channel estimation using the DM-RS and demodulate the downlink data using the performed channel estimation.
  • DM-RS demodulation reference signal
  • Example 1 1 includes the subject matter of Example 10, including or omitting optional elements, where the pattern information includes allocation of resource elements (REs) for the DM-RS.
  • REs resource elements
  • Example 12 includes the subject matter of any of Examples 10-1 1 , including or omitting optional elements, where the one or more processors are configured to receive updated pattern information from the RF interface, wherein the received updated pattern information includes one or more pattern adjustments to facilitate channel estimation efficiency.
  • Example 13 is an apparatus configured to be employed within a base station.
  • the apparatus comprises baseband circuitry which includes a radio frequency (RF) interface and one or more processors.
  • the one or more processors are configured to signal a presence of a shared reference signal (SH-RS) to a plurality of user equipment (UE) devices using the RF interface, configure SH-RS resource elements (REs) in time and frequency, and generate downlink data for transmission using the RF interface, wherein the downlink data includes the SH-RS using the configured SH-RS REs.
  • SH-RS shared reference signal
  • UE user equipment
  • REs resource elements
  • Example 15 includes the subject matter of any of Examples 13-14, including or omitting optional elements, where the one or more processors are configured to signal the presence of the SH-RS using one of radio resource control (RRC) signaling or downlink control information (DCI).
  • RRC radio resource control
  • DCI downlink control information
  • Example 16 includes the subject matter of any of Examples 13-15, including or omitting optional elements, where the downlink data is configured to include overlapping symbols for the SH-RS and a downlink control channel.
  • Example 17 is an apparatus configured to be employed within a base station.
  • the apparatus comprises baseband circuitry which includes a radio frequency (RF) interface and one or more processors.
  • the one or more processors are configured to generate a BRS mapping to periodically locate a BRS in a plurality of slots and provide the plurality of slots to the RF interface for transmission to a user equipment (UE) device, wherein the BRS is used for beamforming and to decode downlink data.
  • RF radio frequency
  • Example 18 includes the subject matter of Example 17, including or omitting optional elements, where the UE device is configured to estimate a time and frequency offset, including a Doppler offset, based on the BRS, and demodulate the PDCCH and PDSCH based on the BRS.
  • Example 19 includes the subject matter of any of Examples 17-18, including or omitting optional elements, where the BRS is transmitted in one slot or two or more slots, and the BRS mapping locates the BRS in first symbol(s) before physical downlink control channel (PDCCH) symbols or consecutive or distributed symbol(s) after the PDCCH symbols.
  • the BRS is transmitted in one slot or two or more slots
  • the BRS mapping locates the BRS in first symbol(s) before physical downlink control channel (PDCCH) symbols or consecutive or distributed symbol(s) after the PDCCH symbols.
  • PDCCH physical downlink control channel
  • Example 20 includes the subject matter of any of Examples 17-19, including or omitting optional elements, where the BRS is a distributed BRS and includes a plurality of antenna ports and the transmission direction of BRS resources for the BRS can be different.
  • Example 21 includes the subject matter of any of Examples 17-20, including or omitting optional elements, where the plurality of antenna ports or number of BRS resources are configured using synchronization signals (SS) or higher layer signaling including RRC signaling or a media access controls (MAC) control element.
  • SS synchronization signals
  • MAC media access controls
  • Example 22 includes the subject matter of any of Examples 17-21 , including or omitting optional elements, where the one or more processors are configured to generate a control channel element (CCE) index for a plurality of antenna ports where the CCE index includes an antenna port group index and a frequency resource.
  • CCE control channel element
  • Example 23 is one or more computer-readable media having instructions that, when executed, cause a base station to determine pattern resources for a reference signal based on one or more properties, where the properties include channel estimation efficiency, generate a pattern using the pattern resources based on the properties, and transmit data using the pattern, wherein the transmitted data includes the reference signal.
  • Example 24 includes the subject matter of Example 23, including or omitting optional elements, where the reference signal is one of a cell specific reference signals (CRS), a shared reference signal (SHRS), a demodulation reference signal (DM-RS) or a beam reference signals (BRS).
  • CRS cell specific reference signals
  • SHRS shared reference signal
  • DM-RS demodulation reference signal
  • BRS beam reference signals
  • Example 25 includes the subject matter of any of Examples 23-24, including or omitting optional elements, where the pattern resources are arranged according to a density based on the one or more properties.
  • Example 26 is an apparatus configured to be employed within a user equipment (UE) device.
  • the apparatus includes a means to receive pattern information for a reference signal, a means to receive downlink data and obtain the reference signal based on the pattern information, a means to perform channel estimation using the reference signal, and a means to decode the downlink data using the reference signal.
  • Example 27 includes the subject matter of Example 26, including or omitting optional elements, further comprising a means to perform beamforming using the reference signal.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media or a computer readable storage device can be any available media that can be accessed by a general purpose or special purpose computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD- ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or other tangible and/or non-transitory medium, that can be used to carry or store desired information or executable instructions.
  • any connection is properly termed a computer-readable medium.
  • a computer-readable medium includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor can be a microprocessor, but, in the alternative, processor can be any conventional processor, controller, microcontroller, or state machine.
  • a processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. Additionally, at least one processor can comprise one or more modules operable to perform one or more of the s and/or actions described herein.
  • modules e.g., procedures, functions, and so on
  • Software codes can be stored in memory units and executed by processors.
  • Memory unit can be implemented within processor or external to processor, in which case memory unit can be communicatively coupled to processor through various means as is known in the art.
  • at least one processor can include one or more modules operable to perform functions described herein.
  • a CDMA system can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA1800, etc.
  • UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA.
  • W-CDMA Wideband-CDMA
  • CDMA1800 covers IS-1800, IS-95 and IS-856 standards.
  • a TDMA system can implement a radio technology such as Global System for Mobile
  • GSM Global System for Mobile Communications
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • Wi-Fi IEEE 802.1 1
  • WiMAX IEEE 802.16
  • IEEE 802.18, Flash-OFDM etc.
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA, which employs OFDMA on downlink and SC-FDMA on uplink.
  • UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP).
  • CDMA1 800 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
  • 3GPP2 3rd Generation Partnership Project 2
  • such wireless communication systems can additionally include peer-to-peer (e.g., mobile-to-mobile) ad hoc network systems often using unpaired unlicensed spectrums, 802. xx wireless LAN, BLUETOOTH and any other short- or long- range, wireless communication techniques.
  • SC-FDMA Single carrier frequency division multiple access
  • SC-FDMA Single carrier frequency division multiple access
  • SC-FDMA has similar performance and essentially a similar overall complexity as those of OFDMA system.
  • SC-FDMA signal has lower peak-to-average power ratio (PAPR) because of its inherent single carrier structure.
  • PAPR peak-to-average power ratio
  • SC-FDMA can be utilized in uplink communications where lower PAPR can benefit a mobile terminal in terms of transmit power efficiency.
  • various aspects or features described herein can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques.
  • article of manufacture as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media.
  • computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., compact disk (CD), digital versatile disk (DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card, stick, key drive, etc.).
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • machine-readable medium can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
  • a computer program product can include a computer readable medium having one or more instructions or codes operable to cause a computer to perform functions described herein.
  • Communications media embody computer-readable instructions, data structures, program modules or other structured or unstructured data in a data signal such as a modulated data signal, e.g., a carrier wave or other transport mechanism, and includes any information delivery or transport media.
  • modulated data signal or signals refers to a signal that has one or more of its characteristics set or changed in such a manner as to encode information in one or more signals.
  • communication media include wired media, such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared and other wireless media.
  • a software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium can be coupled to processor, such that processor can read information from, and write information to, storage medium.
  • storage medium can be integral to processor.
  • processor and storage medium can reside in an ASIC. Additionally, ASIC can reside in a user terminal.
  • processor and storage medium can reside as discrete components in a user terminal. Additionally, in some aspects, the s and/or actions of a method or algorithm can reside as one or any combination or set of codes and/or instructions on a machine-readable medium and/or computer readable medium, which can be incorporated into a computer program product.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, un appareil est configuré pour être utilisé dans une station de base. L'appareil comprend un montage de circuits de bande de base comprenant une interface radiofréquence (RF) et un ou plusieurs processeurs. Le ou les processeurs sont configurés pour déterminer un ou plusieurs ajustements de modèles sur la base d'une ou de plusieurs propriétés de modèles, la ou les propriétés de modèles comprenant une efficacité d'estimation de canal, une performance et une précision de canal de données ; générer un modèle de signal de référence de démodulation (DM-RS) sur la base des ajustements de modèles ; et fournir une transmission DM-RS ayant un DM-RS à l'aide du modèle de DM-RS généré à l'interface RF pour une transmission de liaison descendante vers un dispositif d'équipement utilisateur (UE).
PCT/US2017/051375 2016-09-13 2017-09-13 Signaux de référence pour permettre des systèmes de communication WO2018053009A1 (fr)

Applications Claiming Priority (6)

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CNPCT/CN2016/098873 2016-09-13
CN2016098873 2016-09-13
US201662401714P 2016-09-29 2016-09-29
US62/401,714 2016-09-29
US201662418088P 2016-11-04 2016-11-04
US62/418,088 2016-11-04

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WO2021035241A1 (fr) * 2019-08-16 2021-02-25 Qualcomm Incorporated Techniques de configuration de motif de domaine temporel de signal de référence de démodulation
WO2021037139A1 (fr) 2019-08-30 2021-03-04 Huawei Technologies Co., Ltd. Appareil et procédés de signalisation relative à un signal de référence clairsemé
CN112771807A (zh) * 2018-09-28 2021-05-07 苹果公司 来自多个基站的解调参考信号传输
CN113454965A (zh) * 2019-02-15 2021-09-28 At&T知识产权一部有限合伙公司 促进高级网络中解调参考信号端口的选择
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WO2022150237A1 (fr) * 2021-01-05 2022-07-14 Qualcomm Incorporated Détermination de codes de recouvrement pour la transmission de signaux de référence
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US11777683B2 (en) * 2017-04-01 2023-10-03 Huawei Technologies Co., Ltd. Method and apparatus for transmitting DMRS
US12184579B2 (en) 2017-04-01 2024-12-31 Huawei Technologies Co., Ltd. Method and apparatus for transmitting DMRS
US20220158797A1 (en) * 2017-04-01 2022-05-19 Huawei Technologies Co., Ltd. Method and apparatus for transmitting dmrs
US12137360B2 (en) * 2018-02-19 2024-11-05 Ntt Docomo, Inc. Terminal, radio communication method, base station, and system
CN112771807A (zh) * 2018-09-28 2021-05-07 苹果公司 来自多个基站的解调参考信号传输
CN112771807B (zh) * 2018-09-28 2024-12-10 苹果公司 来自多个基站的解调参考信号传输
CN113454965A (zh) * 2019-02-15 2021-09-28 At&T知识产权一部有限合伙公司 促进高级网络中解调参考信号端口的选择
CN114223180A (zh) * 2019-08-16 2022-03-22 高通股份有限公司 解调参考信号时域模式配置技术
WO2021035241A1 (fr) * 2019-08-16 2021-02-25 Qualcomm Incorporated Techniques de configuration de motif de domaine temporel de signal de référence de démodulation
US11595236B2 (en) 2019-08-16 2023-02-28 Qualcomm Incorporated Techniques for demodulation reference signal time domain pattern configuration
US11569961B2 (en) 2019-08-30 2023-01-31 Huawei Technologies Co., Ltd. Reference signaling overhead reduction apparatus and methods
US11973714B2 (en) 2019-08-30 2024-04-30 Huawei Technologies Co., Ltd Sparse reference signal-related signaling apparatus and methods
EP4018559A4 (fr) * 2019-08-30 2022-10-19 Huawei Technologies Co., Ltd. Appareil et procédés de signalisation relative à un signal de référence clairsemé
WO2021037139A1 (fr) 2019-08-30 2021-03-04 Huawei Technologies Co., Ltd. Appareil et procédés de signalisation relative à un signal de référence clairsemé
US11728925B2 (en) 2021-01-05 2023-08-15 Qualcomm Incorporated Determining overlay codes for transmission of reference signals
WO2022150237A1 (fr) * 2021-01-05 2022-07-14 Qualcomm Incorporated Détermination de codes de recouvrement pour la transmission de signaux de référence

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