+

WO2016137366A1 - Procédé et appareil pour résoudre des collisions de préambule - Google Patents

Procédé et appareil pour résoudre des collisions de préambule Download PDF

Info

Publication number
WO2016137366A1
WO2016137366A1 PCT/SE2015/050207 SE2015050207W WO2016137366A1 WO 2016137366 A1 WO2016137366 A1 WO 2016137366A1 SE 2015050207 W SE2015050207 W SE 2015050207W WO 2016137366 A1 WO2016137366 A1 WO 2016137366A1
Authority
WO
WIPO (PCT)
Prior art keywords
scrambling
random access
response
defined set
values
Prior art date
Application number
PCT/SE2015/050207
Other languages
English (en)
Inventor
Johnny KAROUT
Magnus Stattin
Johan Rune
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2015/050207 priority Critical patent/WO2016137366A1/fr
Publication of WO2016137366A1 publication Critical patent/WO2016137366A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment

Definitions

  • the present invention generally relates to wireless communication networks and particularly relates to wireless communication networks that use contention-based random access procedures.
  • Random access procedures represent an important technique used in various types of communication networks.
  • individual devices vie for access to the network using a Random Access Channel or RACH, which includes a plurality of RACH resources.
  • RACH Random Access Channel
  • a given device transmits a selected random access preamble on a selected RACH resource.
  • Each cell or distinct service area in the network has a corresponding RACH and to reduce the likelihood that more than one device in the same cell will transmit the same preamble on the same RACH resource, each device randomly selects the preamble that it uses from a pool or group of preambles.
  • This arrangement implies several scenarios with respect to a specific RACH resource in a given cell of the network. In a first case, only one device attempts random access using a given RACH resource, meaning there is no contention and the radio node serving the cell only receives one preamble on the RACH resource.
  • two or more devices in the cell select the same RACH resource to use for attempting their random accesses but, as a consequence of the random preamble selection process, each device selects a different preamble.
  • the same RACH resource is used by more than one device, no ambiguity arises because each device transmits a different preamble sequence on the RACH resource.
  • two or more devices in the cell not only use the same RACH resource, they also use the same preamble. This may be referred to as a "preamble collision".
  • preamble collision This may be referred to as a "preamble collision".
  • using larger sets of preamble sequences will, of course, reduce the likelihood of preamble collisions.
  • the size of the preamble sets is practically limited and the possibility of preamble collisions cannot be eliminated.
  • the radio node Even if the radio node successfully receives the simultaneously transmitted preambles involved in a preamble collision, it will not recognize that more than one device has transmitted the same preamble and the random access procedure will continue with two or more devices in contention.
  • the radio node will send an uplink grant mapped to the received preamble without realizing that the uplink grant effectively targets each of the contending devices. Because each contending device will perceive the uplink grant as being targeted to it, each contending device will transmit a message on the granted uplink resources. The nature of this message differs slightly, but the message sent from each contending device in response to the uplink grant provided in the radio node's random access response transmission may be broadly referred to as a "response message".
  • the random access response also includes a Temporary Cell Radio Network Identifier, TC-RNTI, to be used by the device targeted by the random access response.
  • TC-RNTI Temporary Cell Radio Network Identifier
  • the targeted device scrambles its response message as a function of the TC-RNTI indicated in random access response. Consequently, in contention cases where more than one device responds to the random access response, the involved radio node receives multiple response messages at the same time, each one transmitted from a respective one of the contending devices, but all of them using the same scrambling sequence. This event is referred to herein as a "response collision".
  • the interference resulting from the response collision at the radio node may prevent the radio node from successfully demodulating and decoding any colliding response message.
  • the random access procedure fails with respect to all contending devices and all of the random-access signaling up to that point is wasted, and each contending device must restart the random access procedure.
  • the other possibility is that the radio node successfully receives one of the transmissions made on the granted uplink resources. In this case, the return response from the radio node will identify the device associated with that successful reception.
  • This identification provides a resolution to the contention because the identified device will, by the reception of this return response, have successfully concluded the random access procedure and will continue to communicate with/via the network, e.g. to conclude establishment of an RRC connection, while the other contending devices will restart the random access procedure.
  • the identity that the radio node provides in the return message to resolve the contention is an identity that each device includes in its corresponding response message back to the node.
  • the nature of the so-called response message depends on the nature of the random access being attempted.
  • the same or a similar random access procedure can be used by a device for making an initial connection to the network, reconnecting to the network, such as when transitioning from an "idle" state to a "connected” state, and when re-synchronizing to the network for the transmission of uplink data.
  • the identity that the device includes in its response message is an S-TMSI, System Architecture Evolution Temporary Mobile Subscriber Identity, that has previously been assigned to the device by the core network or, in the absence of such an S-TMSI, a 40 bit number randomly generated by the device.
  • the identity the device provides in its response message is a C-RNTI that has previously been assigned by the radio node to the device to be used in the same cell.
  • Fig. 1 provides a detailed signal flow diagram for a device making a random access for transitioning to the "connected" state.
  • Fig. 1 adopts the entity and message names used by the Third Generation Partnership Project, 3 GPP, for cellular communication networks based on the technical specifications associated with Long Term Evolution, LTE, including the associated System Architecture Evolution, SAE, and Evolved Packet System, EPS.
  • SAE System Architecture Evolution
  • EPS Evolved Packet System
  • the aforementioned device is identified as a "UE” or “user equipment”
  • the radio node is denoted as an “eNB” or “evolved NodeB”
  • the associated communication network further includes a Mobility Management Entity, MME, a Home Subscriber Server, HSS, a Policy Charging Rules Function, PCRF, a Serving Packet Gateway, SGW, and a Network Packet Gateway, PGW. Further details regarding these additional network nodes are not included here, as their operations are not germane to the random access procedure of interest.
  • each cell provides a Physical RACH or PRACH and each cell has its own set of preambles defined for use by UEs in making random access attempts.
  • Preambles may be reused between cells, but preferably not between adjacent cells.
  • the preambles may be divided into two groups, denoted as group "A" and group "B".
  • the groups may be defined such that two conditions have to be met for the UE to select a preamble from preamble group B: (1) the potential message size has to exceed a certain threshold; and (2) the estimated path loss has to be lower than a certain threshold. In such cases, the UE selects which group to use for randomly picking a preamble, based on the potential message size.
  • the message size here refers to the data available for transmission in the third illustrated step, along with any Medium Access Control, MAC, header and any possible MAC control elements, and a channel quality estimated from measured downlink path loss.
  • the UE After the UE makes its random selection of a preamble, it transmits the preamble for receipt by the e B serving the current cell of the UE. This transmission is labeled as Step 1 in the flow diagram of Fig. 1 and the preamble transmission is labeled as RA Msgl .
  • the eNB responds to the received preamble by sending a Random Access Response, RAR, labeled as RA Msg2.
  • RAR Random Access Response
  • the random access response is addressed to a Random Access Radio Network Temporary Identifier, RA-RNTI, which is picked out of a set of RNTIs dedicated for this purpose. All devices that have sent a first random access message, including a random access preamble, listen for a random access response from the radio node addressed to an RA-RNTI.
  • the random access response includes an Uplink, UL, grant and a TC-RNTI, as assigned by the eNB for the UE to use when transmitting in the resource allocated by the UL grant.
  • the eNB can respond to multiple devices by sending multiple MAC RARs within the same Protocol Data Unit or PDU, according to the applicable structure of a Random Access Response PDU, provided that each device used a different preamble in its initial random access message.
  • An example of this feature is illustrated in Fig. 2, where one sees an example MAC PDU.
  • the MAC PDU includes a MAC header that in turn includes a number of subheaders corresponding to a plurality of MAC RARs 1 through n.
  • Each MAC RAR targets a different UE and contains a corresponding Temporary Cell RNTI, TC-RNTI, a timing advance command, and an UL grant.
  • Each MAC subheader includes a random access preamble identifier that indicates the particular random access preamble corresponding to the MAC subheader. In this way, the different UEs on non-colliding preambles can recognize the particular MAC RAR targeted to them.
  • FIG. 3 illustrates example contents of a given MAC RAR.
  • the depiction is simplified, e.g., by the omission of any reserved bits, etc., but one sees that the MAC RAR includes a Timing Advance or TA value, and the aforementioned TC-RNTI.
  • the TC-RNTI is assigned by the eNB for use by the targeted UE in scrambling the response message sent by the UE on the UL resources indicated by the UL grant that is also included in the MAC RAR.
  • the response message in question is the RA Msg3 transmission by the UE— i.e., the RRCConnectionRequest message sent by the UE in response to receiving the RA Msg2 from the eNB.
  • RRC here denotes "Radio Resource Control” and the RA Msg3 is sent by the UE on the Physical Uplink Shared Channel, PUSCH, according to the UL grant received by the UE in the MAC RAR in the RAR sent by the eNB as RA Msg2 in the signal flow diagram of Fig. 1.
  • the RRCConnectionRequest is scrambled by the UE, using a sequence derived from the applicable physical cell identity, PCI, and from the TC-RNTI provided in the MAC RAR targeted to the UE. That is, the scrambling sequence used by the UE for its RRCConnectionRequest is determined from the TC-RNTI returned to the UE by the eNB at Step 2 in the RA Msg2 seen in the flow diagram of Fig. 1.
  • Msg3 is transmitted six or seven subframes after the reception of the corresponding RAR, depending on the parameters in the UL grant received in RA Msg2.
  • TDD Time Division Duplex
  • the timing of Msg3 transmission also depends on the configuration of the UL and Downlink, DL, subframes.
  • the UE identity included by the UE in its RRCConnectionRequest message is the S-TMSI, if it is available.
  • S-TMSI denotes the "SAE Temporary Mobile Subscriber Identity”.
  • the S-TMSI typically is available unless the UE is accessing the network from a "DETACHED" state. If the S-TMSI is not available, the UE uses a random 40-bit number.
  • the eNB In response to receiving the RRCConnectionRequest from the UE, the eNB responds with an RRCConnectionSetup message, denoted as "Msg4" in the flow diagram of Fig. 1.
  • Msg4 an RRCConnectionSetup message
  • the eNB uses the TC-RNTI assigned by it to the UE, to descramble the received
  • the RA Msg4 provides initial configuration information for the RRC connection.
  • the UE continues by sending a RRCConnectionSetupComplete message, which includes or is followed by a Non-Access Stratum, NAS, Service Request, which is then forwarded by the eNB to a Mobility Management Entity or MME. That request is then handled based on user authentication processing involving a Home Subscriber Server or HSS.
  • the response collision prevents the eNB from successfully receiving any of the colliding RRCConnectionRequest messages, but it is also possible that one of the messages is successfully received.
  • the contention condition is resolved because the eNB takes the UE identity associated with the successfully-received RRCConnectionRequest message and returns it in the RA Msg4.
  • the UE Identity is indicated in the UE Contention Resolution Identity MAC Control Element contained in the MAC PDU that encapsulates the RRCConnectionSetup message. Any contending UE that does not see its identity in the RA Msg4 will restart the random access procedure.
  • the contention resolution mechanism thus resolves the contention situation where two or more UEs have happened to use the same random access preamble in the same PRACH resource.
  • MTC Machine Type Communications
  • M2M Machine-to-Machine
  • the teachings herein disclose example implementations of methods and apparatuses for resolving preamble collisions between two or more wireless devices that send the same random access preamble coincidentally to a radio node in a wireless communication network and are thus in contention.
  • the teachings enable the contending devices to use different scrambling values, for scrambling the respective response messages sent by the contending devices to the radio node.
  • the radio node resolves the contention by attempting to recover more than one response message from the signaling that is collectively and
  • the node descrambles the received signaling with each of two or more scrambling values in a defined set of the scrambling values that are known candidates for selection by the contending devices.
  • the node processes each recovered message as a separate response to its transmitted random access response.
  • these teachings allow the random access process to continue or to otherwise be handled individually for the contending devices, despite those devices having been involved in a preamble collision.
  • An example embodiment involves a method of operation at a radio node that is configured for operation in a wireless communication network.
  • the method includes receiving a first signal that includes two or more coincident instances of a same random access preamble. Each preamble instance is sent by a respective one of two or more wireless devices contending for random access to the network.
  • the method includes transmitting a random access response in response to the first signal, for receipt by any of the contending wireless devices, and receiving a second signal that includes two or more coincident messages. Each message is sent by a respective one of the contending wireless devices in response to receiving the random access response and is scrambled according to a scrambling value contained in a defined set of two or more scrambling values.
  • the method includes attempting to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and processing each recovered message as a separate response to the random access response.
  • a radio node is configured for operation in a wireless communication network and it includes a communication interface and a processing circuit.
  • the communication interface is configured for transmitting signals to and receiving signals from wireless devices operating in the network
  • the processing circuit is operatively associated with the communication interface and is configured to receive a first signal comprising two or more coincident instances of a same random access preamble. Each preamble instance is sent by a respective one of two or more wireless devices contending for random access to the network.
  • the processing circuit is configured to transmit a random access response in response to the first signal, for receipt by any of the contending wireless devices and to receive a second signal comprising two or more coincident messages.
  • Each message is sent by a respective one of the contending wireless devices in response to receiving the random access response and is scrambled according to a scrambling value contained in a defined set of two or more scrambling values.
  • the processing circuit is configured to attempt to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and to process each recovered message as a separate response to the random access response.
  • a radio node is configured for operation in a wireless
  • the communication network includes means adapted to receive a first signal comprising two or more coincident instances of a same random access preamble.
  • Each preamble instance is sent by a respective one of two or more wireless devices contending for random access to the network, and the included means are further adapted to transmit a random access response in response to the first signal, for receipt by any of the contending wireless devices, and to receive a second signal comprising two or more coincident messages.
  • Each message is sent by a respective one of the contending wireless devices in response to receiving the random access response and is scrambled according to a scrambling value contained in a defined set of two or more scrambling values.
  • the included means are further adapted to attempt to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and to process each recovered message as a separate response to the random access response.
  • a radio node is configured for operation in a wireless
  • a first module is configured to receive a first signal comprising two or more coincident instances of a same random access preamble. Each preamble instance is sent by a respective one of two or more wireless devices contending for random access to the network.
  • a second module is configured to transmit a random access response in response to the first signal, for receipt by any of the contending wireless devices, and a third module is configured to receive a second signal comprising two or more coincident messages. Each message is sent by a respective one of the contending wireless devices in response to receiving the random access response and is scrambled according to a scrambling value contained in a defined set of two or more scrambling values.
  • a fourth module is configured to attempt to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and a fifth module is configured to process each recovered message as a separate response to the random access response.
  • a wireless device is configured for operation in a wireless communication network and it includes a communication interface and a processing circuit.
  • the communication interface is configured for transmitting signals to and receiving signals from radio nodes in the network, and the processing circuit is operatively associated with the communication interface.
  • the processing circuit is configured to transmit a random access preamble to the network and receive a random access response in return. Further, the processing circuit is configured to select a scrambling value from a defined set of two or more scrambling values, and to transmit a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • a wireless device is configured for operation in a wireless communication network and includes a number of modules configured according to the teachings herein.
  • a first module is configured to transmit a random access preamble to the network and receive a random access response in return.
  • a second module is configured to select a scrambling value from a defined set of two or more scrambling values, and a third module is configured to transmit a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • a wireless device is configured for operation in a wireless communication network and includes means adapted to transmit a random access preamble to the network and receive a random access response in return. The included means are further adapted to select a scrambling value from a defined set of two or more scrambling values, and transmit a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • a method of operation at a wireless device configured for operation in a wireless communication network includes transmitting a random access preamble to the network. The method further includes receiving a random access response in return, selecting a scrambling value from a defined set of two or more scrambling values, and transmitting a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • Fig. 1 is a signal flow diagram of a known approach to random access by a wireless device operating in a wireless communication network that uses contention-based random access.
  • Fig. 2 is a diagram of a known Medium Access Control, MAC, Protocol Data Unit, PDU, for sending a random access response, RAR, from a network to a wireless device attempting a random access towards the network.
  • MAC Medium Access Control
  • PDU Protocol Data Unit
  • Fig. 3 is a diagram of a known format for a MAC RAR, as sent from a network.
  • Fig. 4 is a block diagram of one embodiment of a wireless communication network that includes one or more radio nodes configured to perform network-side random access processing as taught herein, along with one or more wireless devices configured to perform complementary device-side random access processing as taught herein.
  • Fig. 5 is a logic flow diagram of one embodiment of a method of random access processing at a network radio node.
  • Fig. 6 is a logic flow diagram of one embodiment of a method of random access processing at a wireless device.
  • Fig. 7 is a block diagram of one embodiment of processing modules or functional circuits implemented in a network node, for network-side random access processing.
  • Fig. 8 is a block diagram of one embodiment of processing modules or functional circuits implemented in a network node, for device-side random access processing.
  • Fig. 4 illustrates a wireless communication network 10 that provides communication services to a potentially large number of wireless devices 12.
  • three wireless devices 12 are illustrated, including device 12-1, device 12-2 and device 12-3. Suffixes are not used when not needed for clarity, and the reference number 12 is used for both plural and singular references herein.
  • each device 12 implements the device-side features taught herein for resolving preamble collisions.
  • the devices 12 also may be referred to as "user equipments" or UEs and non-limiting examples include smartphones, tablets, feature phones, network modems, etc. Broadly, however, the devices 12 individually may be essentially any type of wireless communication apparatus configured for operation in the wireless communication network 10, hereafter, the "network 10"
  • one or more other wireless communication devices 14 may connect to and use the network 10.
  • the reference number 14 distinguishes these other devices from the devices 12 as being "legacy" devices that do not have the device-side features taught herein. These legacy devices 14 carry out conventional random access processing.
  • the network 10 communicatively couples the devices 12 and 14 to one or more external communication networks 16, e.g., the Internet, and it includes a radio node 20 providing a radio cell 22.
  • the Radio Access Network or RAN 24 of the network 10 includes a large number of radio nodes 20 and each one provides one or more cells 22.
  • a Core Network or CN 26 of the network 10 communicatively couples the network 10 to the external network(s) 16, and provides a number of communication services or functions, such as packet routing for the devices 12 and 14 operating within the RAN 24, along with mobility management, user authentication, etc.
  • the RAN 24 comprises an Evolved Universal Terrestrial Radio Access Network or E-UTRAN
  • the CN 26 comprises an Evolved Packet Core or EPC.
  • the radio nodes 20 in such an example comprise eNBs.
  • the illustrated radio node 20 is configured for operation in the network 10 and it includes a communication interface 30 configured for transmitting signals to and receiving signals from devices 12 operating in the network 10.
  • the communication interface 30 comprises a cellular radio transceiver, for example.
  • the radio node 20 further includes a processing circuit 32 that is operatively associated with the communication interface 30.
  • the processing circuit 32 comprises, for example, one or more microprocessors, digital signal processors, Field Programmable Gate Arrays, or
  • processing circuit 32 may be understood as comprising fixed circuitry, programmed circuitry, or any mix of fixed and programmed circuitry, configured according to the network-side teachings herein.
  • the processing circuit 32 is configured at least in part based on its execution of computer program instructions, where those instructions are stored in a computer- readable medium in or accessible to the processing circuit 32— such as in the storage 34 illustrated in the figure.
  • the storage 34 comprises one or more types of computer-readable media, such as a mix of volatile working memory and non-volatile memory. However implemented, the storage 34 provides non-transitory storage— i.e., storage of at least some defined duration, although not necessarily permanent or unchanging storage— for one or more items of configuration data 36 and a computer program 38.
  • the configuration data 36 includes, for example, data defining the set of scrambling values that are available to the wireless devices 12, for selection consideration when scrambling their messages sent in response to receiving a random access response from the radio node 20.
  • the processing circuit 32 is configured to receive a first signal that, in cases of preamble collision, comprises two or more coincident instances of a same random access preamble. Each preamble instance is sent by a respective one of two or more wireless devices 12 contending for random access to the network 10. The processing circuit 32 is configured to transmit a random access response in response to the first signal, for receipt by any of the contending wireless devices 12.
  • the term "coincident” or “coincidentally” in this context means that two or more instances of the same preamble are received together, concurrently, contemporaneously, or simultaneously.
  • receiving two or more instances of the same preamble "coincidentally” means receiving them on the same random access resources— e.g., on the same time/frequency resources— or otherwise receiving them in contention.
  • Each of the contending devices 12 transmits a message in response to receiving the random access response from the radio node 20. Because the contending devices 12 use the same radio timing, frequency resource and random access protocol, the contending devices 12 will send their respective response messages at the same time and on the same frequency resource, resulting a response collision at the radio node 20. These coincident response messages are received as a "second signal" at the radio node 20. In particular, for the contention case at issue, the processing circuit 32 receives a second signal comprising two or more coincident messages. Each message was scrambled by the contending device 12 that transmitted it according to a scrambling value contained in a defined set of two or more scrambling values.
  • a scrambling sequence can be derived, wherein the scrambling sequence is used for the actual scrambling of the transmission. That is, the scrambling sequence is a function of the corresponding scrambling value. Note also that more parameter(s) than just the scrambling value may be involved in the derivation of the scrambling sequence. That is, the scrambling sequence may be a function of the scrambling value and one or more other parameters, such as the subframe number.
  • the processing circuit 32 is configured to attempt to recover more than one message from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and to process each recovered message as a separate response to the random access response.
  • the processing circuit 32 may descramble the second signal using all possible scrambling values, or it may only use a subset of two or more of them. In either case, by attempting to recover more than one response message, the processing circuit 32 advantageously resolves the response collision between two or more contending devices 12.
  • the radio node 20 may be understood as being configured generally to receive and process random access preamble transmissions, and that the processing circuit 32 in particular provides a mechanism by which the radio node can receive, distinguish, and process different random accesses attempted at the same time on the same frequency resource by two or more devices 12 using the same preamble.
  • the processing circuit 32 does not necessarily recognize the contention condition at any point in the processing, up until it actually recovers more than one response message from the second signal received by it in response to its transmission of a random access response.
  • the radio node 20 when a given preamble—the "first signal” described above— is initially received at the radio node 20, it may be that there is no contention and only one instance of the preamble at issue. Therefore, the radio node 20 will receive only one message in the "second" signal described above. The attempted recovery by the processing circuit 20 of more than one message instance from this second signal will therefore not succeed— i.e., only one message will be recovered.
  • the processing circuit 32 may in general operate with the presumption that there is contention on any given random access preamble it receives and it advantageously "looks" for more than one message incoming to it in response to its transmission of a random access response.
  • the attempt by the processing circuit 32 to recover more than one message from the above-described second signal is based on its knowledge that any contending device 12 is configured to select a scrambling value from a defined set of scrambling values, to use for responding to the radio node's random access response.
  • the processing circuit 32 attempts to recover more than one response message from the second signal, on the presumption that the second signal may in fact include more than one response message, with each such response message having been sent from respective one of two or more devices 12 that are in contention as a consequence of preamble collision.
  • any contending device 12 scrambles the message it sends in response to receiving the random access response from the radio node 20 according to a scrambling value that it selects from the defined set of scrambling values.
  • This behavior contrasts with the conventional approach in which wireless devices scramble their response messages as a function of whatever temporary identifier is provided by the network in the random access response.
  • the processing circuit 32 knows the defined set of two or more scrambling values and as such knows what scrambling sequences to use when making multiple recovery attempts with respect to the second signal.
  • each scrambling value comprises a temporary identifier or a scrambling sequence or an index value.
  • the defined set comprises two or more supplemental scrambling values that are in addition to a default scrambling value indicated in the random access response, or comprises the default scrambling value and at least one supplemental scrambling value.
  • the processing circuit 32 is configured to transmit an indication of the defined set for receipt by any of the contending devices 12. It does so by including an indication of the defined set in the random access response, or by including an indication of the defined set in system information broadcasted by the network 10, or by indicating one or more members of the defined set in the random access response and indicating one or more remaining members of the defined set in the system information.
  • the processing circuit 32 is configured to transmit the random access response by transmitting a first part that indicates a default scrambling value as a default temporary identifier, and a second part that indicates one or more additional scrambling values.
  • the defined set comprises the default scrambling value together with the one or more additional scrambling values.
  • the second part indicates two or more additional scrambling values
  • the defined set comprises at least the two or more additional scrambling values, and it also may include the default scrambling value.
  • the first part of the random access response is compatible with legacy wireless devices 14 that do not recognize the second part and are programmed to use only default scrambling values for scrambling messages sent by them in response to receiving random access responses from the network 10.
  • the second part of the random access response is transparent to these legacy wireless devices 14.
  • the defined set of two or more scrambling values comprises at least two supplemental scrambling values that are in addition to a default scrambling value that is indicated in the random access response as a default temporary identifier.
  • the processing circuit 32 is configured to indicate the at least two supplemental scrambling values using generator or pointer values from which the at least two supplemental scrambling values are determinable by a compatible wireless device 12 receiving them, and which generator or pointer values require a smaller signaling payload than would be required for explicit transmission of each of the at least two supplemental scrambling values.
  • Fig. 5 illustrates a method 500 corresponding to the above-described processing.
  • the method 500 is implemented in a radio node 20.
  • the method 500 is implemented based on the execution of computer program instructions by the processing circuit 32, as described earlier.
  • the method 500 includes receiving (Block 502) a first signal that, in cases of contention, includes two or more coincident instances of a same random access preamble. Each preamble instance is sent by a respective one of two or more devices 12 contending for random access to the network 10.
  • the method 500 further includes transmitting (Block 504) a random access response in response to the first signal, for receipt by any of the contending wireless devices 12. Again, at this point, it is not necessary for the radio node 20 to recognize the contention condition and the random access response sent here may be identical to the response that would be sent in a contention-free access attempt where only one instance of the preamble was included in the first signal.
  • the method 500 further includes receiving (Block 506) a second signal comprising two or more coincident messages.
  • Each message is sent by a respective one of the contending devices 12 in response to receiving the random access response.
  • each such message is scrambled by its transmitting device 12 according to a scrambling value contained in a defined set of two or more scrambling values.
  • the method 500 further includes the radio node 20 attempting (Block 508) to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set, and processing (Block 510) each recovered message as a separate response to the random access response.
  • Such processing comprises, for example, performing connection grant or denial processing with respect to each of the recovered messages.
  • the method 500 enables a radio node 20 to distinguish different random access attempts made by two or more devices 12 that transmitted the same random access preamble at the same time.
  • the illustrated device 12-1 is configured for operation in the network 10 and it includes a communication interface 40 configured for transmitting signals to and receiving signals from radio nodes 20 in the network 10, and further includes a processing circuit 42 that is operatively associated with the communication interface 40.
  • the processing circuit 42 includes or is associated with storage 44 that comprises one or more types of computer-readable media and provides non- transitory storage for one or more items of configuration data and/or a computer program 48.
  • the processing circuit 42 may, in fact, comprise multiple processing circuits, e.g., one or more microprocessors, digital signal processors, etc., and can be understood generally to comprise processing circuitry configured to control operation of the device 12-1 in the network 10, and to provide data transmission and reception functionality in concert with the communication interface 40.
  • the processing circuit 42 is configured to transmit a random access preamble to the network 10 and receive a random access response in return.
  • the device 12-1 attempts the random access in a given cell 22 of the network 10 and that the radio node 20 serving that cell 22 provides the random access response.
  • the processing circuit 42 is further configured to select a scrambling value from a defined set of two or more scrambling values, and to transmit a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • the random access response may include a default scrambling value, e.g., a temporary identifier that the radio node 20 expects to be used by a legacy device 14 in responding to the random access response
  • the device 12-1 makes its own selection decision as to which scrambling value to use for scrambling its response message to the radio node's random access response.
  • Each scrambling value comprises a temporary identifier or a scrambling sequence or an index value and in one or more embodiments the processing circuit 42 is configured to select the scrambling value from the defined set of two or more scrambling values by making a random selection.
  • the radio node 20 receives multiple instances of the same preamble but does not recognize or differentiate the multiple instances and simply responds with a random access response, as it would in the case of no contention on the preamble.
  • Each of the contending devices 12-1 and 12-2 are also unaware of the contention but to guard against the possibility of contention, each one makes it own random selection of a scrambling value from a defined set of scrambling values, and uses its individually-selected scrambling value to scramble the message it sends in response to its receipt of the random access response.
  • Each contending device 12 making an individualized, random selection greatly reduces the chance that the same scrambling value will be used by more than one of the contending devices 12-1 and 12-2.
  • any default scrambling value indicated by the radio node 20 in its random access response guarantees that no contending device 12 will use the default scrambling sequence for scrambling the response message.
  • a legacy wireless device 14 is also involved in the contention, then its conventional use of the default scrambling sequence will not be interfered with by any of the contending devices 12.
  • the processing circuit 42 is configured to identify the defined set from signaling received from the network 10, or based on preconfigured information stored in the device 12, e.g., stored in the configuration data 46. In one example, the processing circuit 42 is configured to identify the defined set from signaling included in the random access response, or from system information broadcasted by the network 10, or from a combination of signaling included in the random access response and the system information broadcasted by the network 10.
  • the broadcasted system information may be broadcasted by the radio node 20 serving the current cell 22 of the contending devices 12.
  • the defined set includes two or more supplemental scrambling values that supplement a default scrambling value indicated in the random access response as a default temporary identifier.
  • any contending device 12 is free to select the default scrambling value or any of the supplemental scrambling values, for use in scrambling its message sent in response to receipt of the random access response from the radio node 20.
  • there are at least two supplemental scrambling values in the defined set and the defined set may exclude the default scrambling value to prevent the possibility of conflicting with any legacy wireless device 14 that may happen to be involved in the contention.
  • Fig. 6 illustrates one embodiment of a method 600 of processing at a wireless device 12 that is configured for operation in the network 10.
  • the method 600 includes transmitting (Block 602) a random access preamble to the network 10 and receiving a random access response in return, selecting (Block 604) a scrambling value from a defined set of two or more scrambling values, and transmitting (Block 606) a message in response to receiving the random access response, including scrambling the message for transmission using the selected scrambling value.
  • Figs. 7 and 8 illustrate example embodiments of a radio node 20 and a wireless device 12 in terms of functional-module implementations that may be used to carry out the respective network-side and device-side teachings disclosed herein.
  • the functional modules illustrated in Fig. 7 for the radio node 20 are realized in the processing circuit 32, for example.
  • the functional modules illustrated in Fig. 8 for the device 12 are realized in the processing circuit 42, for example.
  • the radio node 20 comprises a first or receiving module 700A that is configured to receive a first signal comprising two or more coincident instances of a same random access preamble, where each preamble instance is sent by a respective one of two or more wireless devices 12 contending for random access to the network.
  • the radio node 20 comprises a second or transmitting module 702 that is configured to transmit a random access response in response to the first signal, for receipt by any of the contending wireless devices 12.
  • the radio node 20 includes a third module 700B that is configured to receive a second signal comprising two or more coincident messages.
  • each message is sent by a respective one of the contending wireless devices 12 in response to receiving the random access response and is scrambled according to a scrambling value contained in a defined set of two or more scrambling values.
  • the radio node 20 includes a fourth or descrambling module 704 that is configured to attempt to recover more than one of the messages from the second signal, by descrambling the second signal with each of two or more scrambling values in the defined set. Still further, the radio node includes a fifth or processing module 706 that is configured to process each recovered message as a separate response to the random access response. But it will be broadly appreciated that the radio node 20 may be implemented to carry out such processing using a variety of processing or circuit means. According to the example of Fig. 8, the device 12 includes a first or transmitting module 800 A configured to transmit a random access preamble to the network 10 and a second or receiving module 802 configured to receive a random access response in return.
  • the device 12 further includes a third or selection module 804 that is configured to select a scrambling value from a defined set of two or more scrambling values, and a fourth module 800B that is configured to transmit a message in response to receiving the random access response.
  • the fourth module includes or is associated with a fifth or scrambling module 806 that is configured to scramble the message for transmission using the selected scrambling value.
  • the device 12 may be implemented to carry out such processing using a variety of processing or circuit means.
  • the network-side and device-side teachings can be understood as advantageous mechanisms for suppressing or avoiding the interference that would otherwise arise when more than one wireless device responds to a random access response uses the same default, network- specified scrambling sequence for scrambling its response to the network's random access response.
  • the teachings herein provide a mechanism whereby it is likely that each contending device 12 selects a different scrambling value, thereby enabling the involved radio node 20 to decode and demodulate each of the two or more coincident messages received by the radio node 20 from the contending devices— e.g., with reference back to Fig. 1, the teachings herein enable different contending devices 12 to use different scrambling values for scrambling their RA Msg3 transmissions, and thereby enable the receiving radio node 20 to demodulate and decode each one of those messages as a separate transmission.
  • the contending devices 12 are configured, for example, to use a certain probability distribution, preferably a uniform distribution, for selecting the particular scrambling value to use from the defined set of scrambling values.
  • the involved radio node 20 can respond to multiple, colliding devices 12 during its contention resolution process, and is thereby enabled to grant multiple, colliding devices 12 access to the network 10, generally without forcing any of the colliding devices 12 to restart their random access procedures. Few random access attempts leads to reduced radio access latency and reduced load on the RACH resources.
  • Increasing the contention resolution capability of the radio node 20 increases the overall random access efficiency, and the RACH capacity is better utilized in each cell 22 of the network 10. These improvements in turn allow the network 10 to handle higher RA intensities— i.e., to handle a higher number of random access attempts over a given window of time.
  • the load on associated channels such as the Physical Uplink Shared Channel or PUSCH, the Physical Downlink Shared Channel or PDSCH, and the Physical Downlink Control Channel or PDCCH, may be reduced.
  • the freed-up PRACH, PDCCH, PDSCH and/or PUSCH resources can be used instead for other, more productive data/signaling instead.
  • a set of additional TC-RNTIs is announced in the system
  • this additional announced set is taken by the devices 12 as the defined set of scrambling values to be used for selecting a scrambling value.
  • the set may or may not include the default TC-RNTI returned by the involved radio node 20 in any given random access response.
  • the set of additional TC-RNTIs is included in the node's random access response message.
  • the radio node 20 allows the radio node 20 to more dynamically choose the set of additional TC-RNTIs to make available.
  • supplementing the random access response with the additional TC-RNTIs can result in an incompatibility with legacy devices 14.
  • One mechanism contemplated herein for addressing this compatibility problem places the set of additional TC-RNTIs last in the random access response message, after the list of MAC RARs. This location places the additional TC-RNTIs in a space that will not be read by legacy devices 14.
  • a single set of additional TC-RNTIs may be indicated and used by any number of wireless devices 12 that are in contention.
  • the more choices included in the set then the lower the likelihood that two or more of the contending wireless devices 12 will select the same TC-RNTI as their respective scrambling values.
  • the defined set of scrambling values comprises a set of TC-RNTIs
  • having separate sets of TC-RNTIs for the different devices 12 in contention on the same preamble is advantageous in cases where the TC-RNTI selected for scrambling sequence derivation is promoted to use as the Cell or C-RNTI for the device 12 after completion of the random access procedure.
  • Multiple sets may be advantageous in the further case where there is some interdependence between the default TC-RNTI indicated in the MAC RAR and the additional TC-RNTIs.
  • each preamble received at the radio node 20 may involve a preamble collision, with each such collision involving distinct sets of devices 12.
  • the ability to promote a TC-RNTI selected by a given one of the involved devices 12 for later use as a C-RNTI is limited if each distinct set of colliding devices 12 operates with the same set of TC- RNTIs to use in the preamble collision resolution taught herein.
  • Another possibility contemplated herein is the preconfiguration of the extra TC-RNTIs or, more generally, the pre-configuration of additional scrambling values for use by a device 12 in dynamically selecting the scrambling value to use for scrambling the message it sends in response to receiving a random access response from a radio node.
  • a set of such values can be configured in the device's Universal Subscriber Identity Module or USIM, for example.
  • the extra scrambling values can be provided or updated using over-the-air USIM configuration mechanisms.
  • the additional scrambling values are available via pre-configuration, a given device 12 will access the preconfigured set when choosing a scrambling value to use.
  • the radio node 20 may choose not to respond to each such recovered response message. For example, depending on cell or node loading and/or other operational variables, the radio node 20 may choose to reply to only a subset of the successfully recovered response messages, thus implementing a kind of prioritization among the contending devices 12. The choice of which devices 12 to respond to, as well as the order in which to respond to them, could be based on the reasons underlying each contending device's random access attempt.
  • these reasons are discemable from, for example, by the establishmentCause IE in the RRCConnectionRequest message seen in Fig. 1.
  • the reason also may be inferred from channel quality implied by the demodulation/decoding of the device's response message, e.g. derived from the power or Signal-to-Noise-plus-Interference Ratio, SINR, at which it was received at the radio node 20.
  • SINR Signal-to-Noise-plus-Interference Ratio
  • two or more devices 12 that collided on the same preamble could also select the same scrambling value for responding to the node's random access response.
  • the radio node 20 receives two or more response messages that were scrambled with the same selected scrambling value and it may therefore be unable to
  • the contending devices 12 associated with the response messages that were not successfully recovered by the radio node 20 will restart the random access procedure.
  • the devices 12 may exclude the regular or default TC-RNTI from consideration, when making their scrambling value selections. This approach eliminates the risk of a "scrambling sequence collision" between legacy devices 14 and non-legacy devices 12.
  • the set may be indicated using a start value and a length value, wherein the start value is a starting TC-RNTI and the length value represents the number of TC-RNTIs that constitute the contiguous set of additional TC-RNTIs that start with the start value.
  • the set of additional TC-RNTIs is conveyed to the devices 12 across the radio interface, i.e. the methods using the system information or the random access response.
  • the scrambling value selected by any given device 12 in contention is "promoted" by the radio node 20 for use as the C-RNTI of the device 12, irrespective of whether the selected scrambling value was the default TC-RNTI or one of the additional TC-RNTIs.
  • the radio node 20 identifies the TC-RNTI from the scrambling sequence that enabled successful reception of device's response message and promotes that TC-RNTI for use as the C-RNTI of the device 20.
  • This approach requires that the set of additional TC-RNTIs can be dynamically changed, because while a TC-RNTI is allocated as a C-RNTI it cannot be used as a candidate for selection as a TC-RNTI by other devices 12.
  • this approach may be better suited to the dynamic signaling advantages associated with providing the defined set or sets of candidate TC-RNTIs in the random access response transmitted from the radio node 20 to the involved contending devices 12.
  • the promotion of the selected TC-RNTI to C-RNTI may be done implicitly, i.e. known by both the device 12 and the radio node 20 because such promotions are stipulated by the controlling network specifications or standard. Or, the promotion may be explicit, e.g. through an indication sent by the radio node 20.
  • the radio node 20 may be configured to frequently change the defined set of TC-RNTIs, because every time one of the TC-RNTIs in the set is allocated as a C-RNTI, it has to be removed from the set. Depending on how the set is signaled, e.g. if a contiguous set is required, removal of one of the TC-RNTIs in the set may require several other TC-RNTIs in the set to be removed too. In any case, changes in the defined set require that the indications in the system information broadcast or in the random access response messages be adapted accordingly.
  • the radio node 20 reuses released C-RNTIs as TC-RNTIs in the defined set of additional scrambling values, the RNTI space will be increasingly fragmented, making it difficult to find contiguous sets of suitable size.
  • reusing C-RNTIs that have been used by devices 12, but which are de-allocated because the concerned devices 12 are no longer in the RRC CONNECTED state in the involved cell 22, is an important aspect of operation in this variant of the disclosed teachings.
  • the reuse possibility can be stretched further, by enabling the radio node 20 to retrieve/de-allocate a suitable C-RNTI from a given device 12 and reallocate the retrieved value to a defined set of additional scrambling values, for use by one or more devices 12 in selecting the scrambling value to be used for responding to a random access response transmitted to them by the radio node 20.
  • a given C-RNTI may be suitable for filling in a gap created in a given defined set of additional TC-RNTIs, and the radio node 20 could assign a new C-RNTI to the device 12 using the given C-RNTI, e.g., via a C-RNTI MAC Control Element, and "add" the recovered C-RNTI as a TC-RNTI available for selection consideration by one or more other devices 12.
  • the radio node 20 could assign a new C-RNTI to the device 12 using the given C-RNTI, e.g., via a C-RNTI MAC Control Element, and "add" the recovered C-RNTI as a TC-RNTI available for selection consideration by one or more other devices 12.
  • the set does not have to be dynamically updated.
  • the radio node 20 may use the TC-RNTI selected by any given contending device 12 to address that device 12 in a subsequent scheduling assignment sent by the radio node 20 on the PDCCH— refer to the example transmission in Fig. 1 of RA Msg4. This technique allows colliding devices 12 that did not select the involved scrambling value to ignore the RA Msg4. This feature may or may not be combined with the option to promote the TC-RNTI selected by a contending device 12 to the C-RNTI of the device 12.
  • the combination provides a mechanism for the radio node 20 to respond to multiple successfully decoded response messages—i.e., when the "second signal" received by a radio node 20 in response to its transmission of a random access response includes more than one response message from two or more devices 12 in contention, then it may address each of the two or more subsequent scheduling assignments its sends to the contending devices 12 using the TC-RNTIs respectively selected by those contending devices 12.
  • the radio node 20 scrambles its RA Msg4 using the scrambling value that was used by the device 12 that sent the RA Msg3 being responded to via the RA Msg4. This action may be done irrespective of whether or not the scrambling value selected by the involved device 12 for scrambling its RA Msg3 is used as the address of the scheduling assignment on the PDCCH where the downlink transmission resources for the RA Msg4 is indicated.
  • the set of additional TC-RNTIs made available for such selection processing at the contending devices 12 can be represented in various ways, as previously noted. Assuming a contiguous set, one way of indicating the set of additional scrambling values is to indicate one "reference TC-RNTI" and a set size that defines the number of TC-RNTIs in the defined set.
  • the reference TC-RNTI could be the lowest or base TC-RNTI, or the highest or top, or one in the center position in the set.
  • TC-RNTI bitmask or a combination of a bit mask and a reference TC-RNTI, e.g., a bitmask to be applied to a base TC-RNTI.
  • a contiguous set could also be represented by a base and a top TC-RNTI.
  • Non-contiguous sets could be indicated by using one of the above representations multiple times or simply by listing the TC-RNTIs in the set.
  • Another way for the involved radio node 20 to convey additional TC-RNTIs as the defined set of scrambling values available for consideration by the contending devices 12 is to let the set of additional TC-RNTIs be defined in relation to the regular or default TC-RNTI that is included by the radio node 20 the random access response message.
  • the defined set of additional scrambling values could then be defined in the form of two offset values to be added to the regular TC-RNTIs, one representing the start and one representing the end of a contiguous set of additional TC-RNTIs.
  • one offset value represents the start of the contiguous set and another value represents the number of additional TC-RNTIs in the set. The latter of these two ways is the most compact one, since the indication of the number of additional TC-RNTIs can be kept short.
  • the representation consists of two values
  • these two values could be included in the random access response message or indicated in the system information or preconfigured in the USIM or standardized. It would also be possible to convey one of the two values in one of the above ways, while the other value is conveyed in another way, e.g. the start of the defined set of scrambling values could be indicated in the random access response message, while the length of the set is standardized or announced in the system information. Moreover, it is contemplated herein to adjust the size of the defined set of scrambling values dynamically.
  • While a larger defined set e.g., a larger set of candidate TC-RNTIs, reduces the chance that two contending devices 12 will select the same scrambling value, the more scrambling selection choices provided to the contending devices 12, the more complicated is the descrambling task at the radio node 20. It may be that the "optimum" size of the defined set of scrambling values made available to any given number of devices 12 that are in contention depends on cell or node loading, the decoding capability of the involved radio node 20, contention resolution and/or signaling capacities, etc. Thus, the size of the defined set can be changed over time or with respect to any particular contention instance or any particular set of contending devices 12.
  • the scrambling values themselves comprise scrambling sequences.
  • a contending device 12 uses the selected TC-RNTI to derive a corresponding scrambling sequence.
  • each scrambling sequence could be advantageously represented as an index value that points to a scrambling sequence stored in a look-up table of other data structure that includes all the scrambling sequences available for consideration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des exemples d'implémentation de procédés et d'appareils adaptés pour résoudre des collisions de préambule entre deux dispositifs sans fil ou plus qui envoient en même temps le même préambule d'accès aléatoire à un nœud radio dans un réseau de communication sans fil et sont ainsi en conflit. Dans un aspect, l'invention permet aux dispositifs en conflit d'utiliser différentes valeurs d'embrouillage pour brouiller les messages de réponse respectifs envoyés par les dispositifs en conflit au nœud radio. Dans un autre aspect, le nœud radio résout le conflit en tentant de récupérer plus d'un message de réponse à partir des signaux qui sont reçus collectivement et simultanément des dispositifs en conflit. Le nœud désembrouille les signaux reçus avec chacune de deux valeurs de brouillage ou plus dans un ensemble défini des valeurs d'embrouillage qui sont des candidats connus pouvant être sélectionnés par les dispositifs en conflit. Le nœud traite chaque message récupéré en tant qu'une réponse séparée à sa réponse d'accès aléatoire transmise.
PCT/SE2015/050207 2015-02-24 2015-02-24 Procédé et appareil pour résoudre des collisions de préambule WO2016137366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2015/050207 WO2016137366A1 (fr) 2015-02-24 2015-02-24 Procédé et appareil pour résoudre des collisions de préambule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2015/050207 WO2016137366A1 (fr) 2015-02-24 2015-02-24 Procédé et appareil pour résoudre des collisions de préambule

Publications (1)

Publication Number Publication Date
WO2016137366A1 true WO2016137366A1 (fr) 2016-09-01

Family

ID=52672313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2015/050207 WO2016137366A1 (fr) 2015-02-24 2015-02-24 Procédé et appareil pour résoudre des collisions de préambule

Country Status (1)

Country Link
WO (1) WO2016137366A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111279771A (zh) * 2017-09-05 2020-06-12 上海诺基亚贝尔股份有限公司 方法、装置和计算机程序
CN114698059A (zh) * 2017-06-14 2022-07-01 摩托罗拉移动有限责任公司 执行用于系统信息请求的竞争解决
WO2024140763A1 (fr) * 2022-12-30 2024-07-04 维沃移动通信有限公司 Procédé et appareil de traitement de brouillage, procédé et appareil de traitement de transmission et dispositif

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005067212A1 (fr) * 2004-01-08 2005-07-21 Sony Corporation Configuration de paquet permettant la coexistence de stations dans un reseau local sans fil multistandard
US7164918B2 (en) * 2000-03-28 2007-01-16 Koninklijke Philips Electronics, N.V. Radio communication system
US20090238366A1 (en) * 2008-03-13 2009-09-24 Lg Electronics Inc. Random access method for improving scrambling efficiency
US20140029548A1 (en) * 2007-08-15 2014-01-30 Lg Electronics Inc. Dedicated signature allocation and choice

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7164918B2 (en) * 2000-03-28 2007-01-16 Koninklijke Philips Electronics, N.V. Radio communication system
WO2005067212A1 (fr) * 2004-01-08 2005-07-21 Sony Corporation Configuration de paquet permettant la coexistence de stations dans un reseau local sans fil multistandard
US20140029548A1 (en) * 2007-08-15 2014-01-30 Lg Electronics Inc. Dedicated signature allocation and choice
US20090238366A1 (en) * 2008-03-13 2009-09-24 Lg Electronics Inc. Random access method for improving scrambling efficiency

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification (Release 12", 3GPP TS 36.321 V12.1.0, March 2014 (2014-03-01)
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures (Release 12", 3GPP TS 36.213 V12.1.0, March 2014 (2014-03-01)
TD TECH: "Contention Resolution and Initial Random Access", 20 February 2007, 3GPP DRAFT; R2-070910, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, XP050133923 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114698059A (zh) * 2017-06-14 2022-07-01 摩托罗拉移动有限责任公司 执行用于系统信息请求的竞争解决
CN111279771A (zh) * 2017-09-05 2020-06-12 上海诺基亚贝尔股份有限公司 方法、装置和计算机程序
CN111279771B (zh) * 2017-09-05 2023-07-25 上海诺基亚贝尔股份有限公司 用于通信的方法和装置
WO2024140763A1 (fr) * 2022-12-30 2024-07-04 维沃移动通信有限公司 Procédé et appareil de traitement de brouillage, procédé et appareil de traitement de transmission et dispositif

Similar Documents

Publication Publication Date Title
JP7088603B2 (ja) データ伝送方法、端末デバイス及びアクセスネットワークデバイス
CN106465401B (zh) 在无线通信系统中发送具有低延迟的上行链路数据的方法和设备
CN111837446B (zh) 随机接入的方法和通信设备
EP3043615B1 (fr) Procédé, équipement utilisateur et station de base pour prédétermination de ressource dans un accès aléatoire
US8958317B2 (en) Method and apparatus for performing random access in a multi-carrier system
EP4301072A2 (fr) Accès aléatoire avec commutateur de partie de bande passante
CN109863816B (zh) 随机接入方法、装置及存储介质
US20160309507A1 (en) Method and apparatus for random access in machine type communication network
US20100322096A1 (en) Method of improving component carrier identification in a random access procedure in a wireless communication system and related communication device
CN111557118A (zh) 移动通信中两步骤rach程序之消息a的资源分配
US11843454B2 (en) DMRS port determining method and communications apparatus
WO2012071681A1 (fr) Terminal de communication sans fil, station de base de communication sans fil et procédé de communication sans fil correspondant; programme de mise en œuvre dudit procédé de communication sans fil et support de stockage de ce programme
US20160135145A1 (en) Telecommunications apparatus and method relating to a random access procedure
CN113424641B (zh) 无线通信网络中的随机接入
CN110366261A (zh) 一种连接态终端随机接入方法和装置
CN113455089A (zh) 随机接入过程中的竞争解决
CN116171636B (zh) 随机接入响应的处理方法、网络设备和终端设备
TW201714441A (zh) 處理系統資訊的裝置及方法
CN109587811B (zh) 一种信息获取方法及终端
JP2019503613A (ja) アップリンクブロードキャストの方法、端末デバイス及びネットワークノード
US20150312938A1 (en) Mtc rach procedure
WO2016137366A1 (fr) Procédé et appareil pour résoudre des collisions de préambule
WO2020124598A1 (fr) Procédé et dispositif d'accès aléatoire
US10694542B2 (en) Classification of user equipment using extended set of random access preambles
EP3849270A1 (fr) Procédé de transmission de signal et appareil de communication

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15709782

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15709782

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载