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WO2018137517A1 - Procédé et appareil de transmission de signaux - Google Patents

Procédé et appareil de transmission de signaux Download PDF

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Publication number
WO2018137517A1
WO2018137517A1 PCT/CN2018/072893 CN2018072893W WO2018137517A1 WO 2018137517 A1 WO2018137517 A1 WO 2018137517A1 CN 2018072893 W CN2018072893 W CN 2018072893W WO 2018137517 A1 WO2018137517 A1 WO 2018137517A1
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WO
WIPO (PCT)
Prior art keywords
pdcch
different
pdcch candidates
candidates
ofdm symbol
Prior art date
Application number
PCT/CN2018/072893
Other languages
English (en)
Inventor
Hua Xu
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp., Ltd.
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 Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to CN201880003380.0A priority Critical patent/CN109792372B/zh
Publication of WO2018137517A1 publication Critical patent/WO2018137517A1/fr

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    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to the field of communication, and particularly to a method and apparatus for transmitting signals.
  • NR new radio
  • NR new radio
  • more spectrum would be used especially at higher frequency bandwidth (>6GHz) and some new techniques such as beamforming (BF) are adopted.
  • BF beamforming
  • the use of BF on one side would improve the BF gain and reduce the interference, and on the other side, the wavelength at higher frequency will reduce the size of antennas array and make its implementation feasible.
  • the PDCCH could also benefit from BF transmission to guarantee its coverage and robustness.
  • the present disclosure describes a PDCCH design with BF in mind which is novel and different from that in LTE system.
  • techniques can include provide a method for transmitting signals in which all control channel elements (CCEs) of a PDCCH candidate are allocated to an OFDM symbol and a PDCCH is transmitted using the PDCCH candidate on the OFDM symbol.
  • CCEs control channel elements
  • techniques can include provide a method for transmitting signals in which a set of PDCCH candidates is configured for the PDCCH and the set of PDCCH candidates is split to different OFDM symbols.
  • techniques can include provide a method for allocating resources in which all CCEs of a PDCCH candidate are allocated to one OFDM symbol.
  • techniques can include provide a method for allocating resources in which all PDCCH candidates configured for one PDCCH are allocated to one symbol.
  • techniques can include provide a method for allocating resources in which all PDCCH candidates configured for one PDCCH are split to different symbols.
  • FIG. 1 illustrates a wireless communication system
  • FIG. 2 illustrates a terminal
  • FIG. 3 illustrates a network device
  • FIG. 4 illustrates a PDCCH structure in LTE.
  • FIG. 5 illustrates an example for PDCCH candidates.
  • FIG. 6 illustrates a beam link pair in a 5G NR system.
  • FIG. 7 illustrates a schematic diagram in which PDCCH candidates on different OFDM symbols are transmitted with different beams.
  • FIG. 8 is a schematic diagram in which PDCCH candidates on the same OFDM symbol are transmitted with different beams.
  • FIG. 9 is a schematic diagram in which a set of PDCCH candidates are split.
  • FIG. 10 is another schematic diagram in which a set of PDCCH candidates are split.
  • FIG. 11 is a schematic diagram in which PDCCH candidates are re-allocated.
  • FIG. 12 is a block diagram of an apparatus for transmitting signals according to an embodiment.
  • FIG. 13 is a block diagram of an apparatus according to an embodiment.
  • FIG. 1 illustrates a wireless communication system according to the present disclosure.
  • the wireless communication system may operate on a high frequency band, which includes but not limited to a long term evolution (LTE) system, a future evolved fifth generation (5G) system, a new radio (NR) system, and a machine to machine (M2M) system.
  • LTE long term evolution
  • 5G future evolved fifth generation
  • NR new radio
  • M2M machine to machine
  • the wireless communication system illustrated in FIG. 1 is merely illustrative of the technical solution of the present disclosure and is not intended to limit the scope thereof. It will be appreciated by those of ordinary skill in the art that with the evolution of the network architecture and the emergence of new business scenarios, technical solutions proposed herein can be equally applicable to similar technical problems.
  • the wireless communication system 100 may include one or more network devices 101, one or more terminals 103, and a core network 111.
  • Network device 101 can be a base station, which can communicate with one or more terminals or base stations with terminal function.
  • the base station can be gNB.
  • Terminal 103 may be distributed throughout the wireless communication system 100, either stationary or mobile.
  • terminal 103 may be a mobile device, a mobile station, a mobile unit, an M2M terminal, a wireless unit, a remote unit, a user agent, a mobile client and so on.
  • Network device 101 can communicate with terminal 103 under the control of a controller which is not illustrated in the figure. In some embodiments, this controller can be part of core network 111 or can be integrated into network device 101.
  • FIG. 2 illustrates a terminal 200.
  • Terminal 200 may include one or more terminal processors 201, a memory 202, a communication interface 203, a bus 204, a receiver 205, a transmitter 206, a coupler 207, an antenna 208, a user interface 202, and an input and output device (such as a microphone, a keyboard, a display, and the like) .
  • the processors 201, the communication interface 203, the receiver 205 and the transmitter 206 may be connected via bus 204 or other means.
  • Communication interface 203 may be used for terminal 200 to communicate with other communication devices, such as network devices.
  • Transmitter 206 may be used to transmit signals output from terminal processor 201, such as perform signal modulation.
  • Input/output device 210 may be used to implement the interaction between terminal 200 and users/external environment.
  • Memory 202 is coupled to terminal processor 201 for storing various software programs and/or instructions.
  • Terminal processor 201 may be used to read and execute computer readable instructions such as those stored in memory 202.
  • FIG. 3 illustrates a network device 300.
  • Network device 300 may be a gNB and include one or more network device processors 301, a memory 302, a communication interface 303, a transmitter 305, a receiver 306. These components may be connected via a bus 304 or other means. As illustrated in FIG. 3, the network device 300 may further include a coupler 307 and an antenna 308 connected to the coupler.
  • Communication interface 303 may be used for network device 300 to communicate with other communication devices, such as a terminal device or other network device.
  • Transmitter 305 may be used to transmit signals output from network device processor 301, such as perform signal modulation.
  • Network device processor 301 can be responsible for wireless channel management, communication links establishment, and cell switching control for users within the control area.
  • Network device processor 301 can also read and executed computer readable instructions such as those stored memory 302 which is coupled thereto.
  • PDCCH Physical downlink control channel
  • PDCCH is a set of physical resource particles that carry downlink control information, including transmission format, resource allocation, uplink scheduling permission, power control and uplink retransmission information and the like.
  • the PDCCH is transmitted at one or more sets of resource called control channel element (CCE) , and each CCE are further divided into a number of resource element groups (REGs) .
  • the REGs from different PDCCHs are interleaved and spread across the whole downlink (DL) control region to obtain diversity gain.
  • BLP Beam link pair
  • BF can be adopted, and both system and UE could use transmit BF and receive BF to increase the BF gain.
  • transmit BF and receive BF could form different BLP and the reception performance on each BLP could be different.
  • the whole OFDM symbol could be transmitted on the same beam. Therefore, to make sure that PDCCH could be transmitted on the right beam to the UE, the system may use different beams at different time to transmit PDCCH to the UE. Such behavior could be transparent to the UE as switch could happen dynamically and system may not send any signal to inform UE such change prior to the PDCCH transmission. With such issue in mind, the PDCCH candidates and search space could be designed to cope with it and improve the BLP switch and robustness of PDCCH transmission.
  • all control channel elements (CCEs) of a PDCCH candidate are allocated to one OFDM symbol and a PDCCH will be transmitted using the PDCCH candidate on the OFDM symbol.
  • CCEs control channel elements
  • each block on the OFDM symbol represents a candidate.
  • the UE could simply search for its PDCCH candidates on the 1 st symbol first, and if it does not decode anything correctly, it can start to search for its PDCCH candidates on the 2 nd symbol and so on so forth, and therefore, it could facilitate UE blind decoding (BD) .
  • BD UE blind decoding
  • OFDM symbol is used as an example herein, however, the proposal can be equally applied to other symbols such as single-carrier frequency-division multiple access (SC-FDMA) symbol as well as other symbols or carriers that may appear in the future and configured to carry PDCCH.
  • SC-FDMA single-carrier frequency-division multiple access
  • a set of PDCCH candidates which may include one or more PDCCH candidates, can be configured for one PDCCH, and based on this, how to allocate the PDCCH candidates of one PDCCH on OFDM symbols as well as how to transmit PDCCH is hereinafter discussed.
  • a set of PDCCH candidates configured for one PDCCH can be allocated to one OFDM symbol, and the PDCCH can be transmitted on the OFDM symbol with different beams using the set of PDCCH candidates.
  • the PDCCH can be transmitted on different OFDM symbols repeatedly.
  • a set of PDCCH candidates configured for one PDCCH can be split to different OFDM symbols, namely, two or more than two OFDM symbols, and PDCCH can be transmitted on the different OFDM symbols with the same or different beams.
  • PDCCH candidates are allocated to different OFDM symbols and PDCCH can be transmitted using the PDCCH candidates with different directional beams respectively.
  • PDCCH candidates for PDCCH #1 and PDCCH #2 are allocated to different OFDM symbols (OFDM symbol #1 and OFDM symbol #2) respectively and different beams are used to transmit PDCCH on each OFDM symbol. This could facilitate the transmission of PDCCH on different transmit beams, and hence reduce the risk of beam mismatch and increase the robustness of PDCCH transmission.
  • the PDCCH candidates configured for it can be allocated to one OFDM symbol.
  • PDCCH candidates configured for one PDCCH could be split to different symbols and PDCCH can be transmitted using these PDCCH candidates on the different symbols with different beams, that is, different PDCCH candidates (along with corresponding CCEs) can be allocated to different OFDM symbols and PDCCH can be transmitted using these PDCCH candidates on the different OFDM symbols, which will be explained in detail later in Implementation 3.
  • the different/same PDCCH candidates (along with all corresponding CCEs) can be allocated to different OFDM symbols and PDCCH can be transmitted using these PDCCH candidates on different beams thus exploit the BF gain while also avoid the beam mismatch between the system and UE.
  • PDCCH using PDCCH candidates allocated to different OFDM symbols can be transmitted using the same beams.
  • different OFDM symbols may use the same beam for transmitting if the load on one OFDM symbol is quite small or if few or even no candidate is allocated to the OFDM symbol.
  • whether the same or different beams will be used for different symbols is not strictly limited and it can be flexibly configured according to loads of symbols for example.
  • the system side or gNB (which is similar as eNB in LTE and can be other access devices) in a 5G NR system has multiple antenna array transceiver panels, that is, suppose digital BF is adapted, it could form different transmit/receive beams on the same OFDM symbol.
  • PDCCH using different PDCCH candidates configured for the PDCCH could be transmitted on the same OFDM symbol but from different transmit beams, so as to increase beam coverage and obtain energy gain, this can be especially beneficial when UE is moving.
  • PDCCH#1 will be transmitted with different beams using PDCCH candidate #1-a and PDCCH candidate #1-b that fall within the coverage of different beams respectively. This applies equally to PDCCH #2.
  • PDCCH #2 will be transmitted with different beams using PDCCH candidate #2-a and PDCCH candidate #2-b that fall within the coverage of different beams respectively.
  • the four PDCCH candidates on the OFDM symbol illustrated in FIG. 8 could be repeatedly allocated to another OFDM symbol and the PDCCH will be transmitted with beams different from those for the OFDM symbol illustrated in FIG. 8.
  • These implementations could facilitate BD of UE if it does not receive the information on total number of OFDM symbols for control region.
  • the UE could simply search for its PDCCH candidates on the 1 st symbol first, and if it does not decode anything correctly, it can start to search for its PDCCH candidates on the 2 nd symbol and so on so forth.
  • These approaches also reduce the decoding latency at UE as UE could start decoding PDCCH candidates on the 1 st symbol after receiving it without the need to buffer the 2 nd and 3 rd OFDM symbols before starting the PDCCH decoding process.
  • PDCCH candidates could also be split and allocated to different OFDM symbols, as illustrated in FIG. 9 as an example, where PDCCH candidates of different CCE AL are evenly split for different OFDM symbols.
  • the PDCCH candidates allocated to each OFDM symbol could include PDCCH candidates of different CCE AL.
  • Such PDCCH candidate allocations provided in Implementation 3 could be configured semi-statically and signaled to the UE using a higher layer signal.
  • the configuration could include the total number of PDCCH candidates allocated to each OFDM symbol, the number of PDCCH candidates of each CCE AL allocated to each OFDM symbol, and maybe some information on locations of PDCCH candidates on each OFDM symbol.
  • the configuration may also include the total number of OFDM symbols that the PDCCH candidates for this particular UE could be allocated to, which may or may not be the same as the total number of OFDM symbols for the control region.
  • the configuration of a particular UE could only include the first two OFDM symbols, namely, 1 st and 2 nd OFDM symbols.
  • the configuration of a particular UE could only include the last two OFDM symbols, namely, 2 nd and 3 rd OFDM symbols of total three OFDM symbols control resource set.
  • the allocations of different number of PDCCH candidates to each OFDM symbol could be based on coverage of beams, beams that are formed on each OFDM symbol, as well as loads on each OFDM symbol.
  • gNB knows that the UE is in the coverage of one beam, it could allocate most of all PDCCH candidates to that UE onto the OFDM symbol that is transmitted on that particular beam. If UE could be in the overlapping area covered by two beams, the gNB could allocate PDCCH candidates to both OFDM symbols that are transmitted on two beams respectively.
  • the gNB could allocate PDCCH candidates to other OFDM symbols.
  • different OFDM symbols could transmit with the same or different beams, thus make the resource allocation more flexible.
  • FIG. 11 One example is illustrated in FIG. 11. As illustrated in FIG. 11, five PDCCH candidates for PDCCH #1 and two PDCCH candidates for PDCCH #2 are allocated to OFDM symbol #1 while no candidate is allocated to OFDM symbol #2 at the beginning.
  • load of the OFDM symbol #1 could be large and for reasons of balance and transmission reliability
  • two PDCCH candidates for PDCCH #1 and one PDCCH candidates for PDCCH #2 can be moved from OFDM symbol #1 to OFDM symbol #2 for example, the result is illustrated in the lower half of FIG. 11.
  • all PDCCH candidates for PDCCH #2 can be moved to OFDM symbol #2 while leaving PDCCH candidates for PDCCH #1 on OFDM symbol #1.
  • Technical schemes provided herein could support BF for PDCCH and facilitate the transmission of PDCCH on different transmit beams, and hence reduce the risk of beam mismatch and increase the robustness of PDCCH transmission.
  • the above-mentioned technical schemes could also be used to allocate control resources among different OFDM symbols more effectively for the control channel and reduce overall blocking ratio.
  • Such flexible resource allocation of PDCCH candidates could reduce per UE BD.
  • the number of PDCCH candidates that could be allocated to each UE can be configured semi-statically. For example, if the UE is at the cell edge and may have difficulty in receiving PDCCH, the gNB could allocate more PDCCH candidates to this UE, so that the UE may have more chances (because more PDCCH candidates) to receive it correctly, on the contrary, if the UE is at cell center with good signal to Interference plus noise (SINR) , its total number of PDCCH candidates could be reduced and thus leave more resource for other UEs and also reduce the BD of this UE to save power.
  • SINR signal to Interference plus noise
  • the PDCCH candidates at each CCE AL could also be adjusted accordingly on a semi-static manner based on the above-mentioned principle for each UE.
  • an apparatus for transmitting signals can make use of the above-mentioned PDCCH design and can be configured to perform the method for transmitting signals.
  • FIG. 12 is a block diagram illustrating the apparatus for transmitting signals.
  • apparatus 40 may include an allocating unit 42 and a transmitting unit 44.
  • Apparatus 40 can be arranged at gNB side and communicate with UEs.
  • Allocating unit 42 can be a processor integrated with resource configuration function.
  • Transmitting unit 44 can be a transmitter, transceiver, antenna, wireless transmission equipment, and any other devices equipped with transmission function.
  • allocating unit 42 can be configured to allocate all CCEs of a PDCCH candidate to an OFDM symbol
  • transmitting unit 44 can be configured to transmit a PDCCH using the PDCCH candidate on the OFDM symbol.
  • transmitting unit 44 could transmit the PDCCH using PDCCH candidates for the PDCCH on one OFDM symbol with different beams. In another implementation, transmitting unit 44 could transmit the PDCCH using PDCCH candidates on different OFDM symbols with different beams or the same beam.
  • Certain aspects of the embodiments described in the present disclosure may be provided as a computer program product, or software, that my include, for example, a computer-readable storage medium or a non-transitory machine-readable medium having stored thereon instructions, which may be used to program a computer system (or other electronic devices) or a processor to perform a method for allocating resources or transmitting signals according to the present disclosure.
  • a non-transitory machine-readable medium includes any mechanism for storing information in a form (e.g., software, processing application) readable by a machine (e.g., a computer) .
  • the non-transitory machine-readable medium may take the form of, but is not limited to, a magnetic storage medium, optical storage medium (e.g., CD-ROM) , magneto-optical storage medium, read only memory (ROM) , random access memory (RAM) , erasable programmable memory, flash memory, and so on.
  • a magnetic storage medium e.g., CD-ROM
  • optical storage medium e.g., CD-ROM
  • magneto-optical storage medium e.g., magneto-optical storage medium
  • ROM read only memory
  • RAM random access memory
  • erasable programmable memory erasable programmable memory
  • flash memory erasable programmable memory
  • FIG. 13 illustrated an apparatus 50 in which a processor 52 and one or more interfaces 56 coupled with processor 52 via a BUS 54 are provided.
  • Processor 52 may be configured to read and execute computer readable instructions.
  • processor 52 may primarily include a controller, an operator, and a register, and the hardware architecture of processor 52 may be an application specific integrated Circuits (ASIC) architecture, a microprocessor without interlocked piped stages (MIPS) architecture, an advanced reduced instruction set computer (RISC) machine (ARM) architecture, or a network processor (NP) architecture.
  • ASIC application specific integrated Circuits
  • MIPS microprocessor without interlocked piped stages
  • RISC advanced reduced instruction set computer
  • NP network processor
  • Interface 56 can be configured to input data to be processed to processor 52 and/or output processing results of processor 52 to the outside.
  • Interface 56 can be connected with one or more peripheral equipment such as a display (for example, LCD) , camera, RF module, and so on.
  • processor 52 can invoke, from a memory, programs with regard to the method for transmitting signals and perform instructions contained in the programs to achieve corresponding operations such as resources configuration and signal transmission.
  • Interface 56 can be configured to output the result of resources allocation, whereby a transceiver can transmit signals on the resources allocated.
  • a new PDCCH design can be provided to accommodate requirements in a 5G NR system; such PDCCH design can support BF for PDCCH and avoid beam mismatch of PDCCH, as well as support flexible resource allocation of PDCCH candidates and reduce per UE BD and overall blocking ratio.

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

Abstract

L'invention concerne un procédé et un appareil de transmission de signaux, dans lesquels tous les éléments de canal de commande (CCE) d'un canal de commande de liaison descendante physique (PDCCH) candidat sont attribués à un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) et transmettent un PDCCH à l'aide du PDCCH candidat sur le symbole OFDM.
PCT/CN2018/072893 2017-01-27 2018-01-16 Procédé et appareil de transmission de signaux WO2018137517A1 (fr)

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Application Number Priority Date Filing Date Title
CN201880003380.0A CN109792372B (zh) 2017-01-27 2018-01-16 传输信号的方法及设备

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US201762451256P 2017-01-27 2017-01-27
US62/451,256 2017-01-27

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EP4418778A4 (fr) * 2021-10-13 2025-02-12 Zte Corp Procédé et appareil de réglage auto-adaptatif pour ressource de canal de commande de liaison montante, et support de stockage

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EP4418778A4 (fr) * 2021-10-13 2025-02-12 Zte Corp Procédé et appareil de réglage auto-adaptatif pour ressource de canal de commande de liaison montante, et support de stockage

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