WO2020164635A1 - 初始信号传输方法、装置 - Google Patents

初始信号传输方法、装置 Download PDF

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Publication number
WO2020164635A1
WO2020164635A1 PCT/CN2020/075571 CN2020075571W WO2020164635A1 WO 2020164635 A1 WO2020164635 A1 WO 2020164635A1 CN 2020075571 W CN2020075571 W CN 2020075571W WO 2020164635 A1 WO2020164635 A1 WO 2020164635A1
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WIPO (PCT)
Prior art keywords
pdcch
dmrs
initial signal
search space
specific
Prior art date
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PCT/CN2020/075571
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English (en)
French (fr)
Inventor
吴霁
张佳胤
贾琼
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20756666.2A priority Critical patent/EP3927083B1/en
Publication of WO2020164635A1 publication Critical patent/WO2020164635A1/zh
Priority to US17/403,264 priority patent/US12010721B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • 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 signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • This application relates to the field of wireless communication technology, and in particular to an initial signal detection method and device.
  • LBT Listen-Before-Talk
  • An eNB working in an unlicensed frequency band can start LBT at any time. Due to the uncertainty of the occurrence and duration of interference generated by other systems, LBT may end at any time. How to efficiently utilize the time-domain resources after the successful LBT is a problem that this application focuses on.
  • This application provides a more efficient initial signal detection mechanism applied to unlicensed spectrum.
  • an initial signal detection method including: the UE performs detection on one or more sub-channels of the unlicensed spectrum; according to the first detected combination of GC-DMRS and GC-PDCCH, it is determined that the downlink transmission has started or is confirmed COT has already started.
  • the configuration of the search space (search space) of the initial signal of the UE conforms to one or any combination of the following: the aggregation level of the GC-PDCCH in the initial signal is set to a fixed value; or, The maximum number of blind checks of the GC-PDCCH in the initial signal is 1 or 2 times in each slot.
  • the foregoing configuration may be stipulated by the standard, or the network side may configure one or more UEs (for example, a UE group in a cell).
  • the combination of GC-DMRS and GC-PDCCH detected for the first time by the UE is located at symbols 1, 3 or 7 in a slot, and the method further includes: the UE is in the search space of the GC-PDCCH ( Continue to search for its own first UE-specific PDCCH in the search space.
  • the first UE-specific PDCCH uses the NR DCI 1_0 format.
  • a corresponding initial signal transmission method including: the network side performs LBT on one or more subchannels of the unlicensed spectrum; the network side transmits one or more subchannels on one or more subchannels where LBT succeeds.
  • the configuration of the search space (search space) of the initial signal of one or more UEs conforms to one or any combination of the following: the aggregation level (aggregation level) of the GC-PDCCH in the initial signal is set to a fixed value; Alternatively, the maximum number of blind detections of the GC-PDCCH in the initial signal is 1 or 2 times for each detected symbol.
  • the above configuration may be specified by the standard, that is, configured directly when the communication system is initialized, or may be the search space configuration information for the network side to send the initial signal of the one or more UEs.
  • the first combination of GC-DMRS and GC-PDCCH sent in the foregoing is located at the start position of COT.
  • one of the sent one or more combinations of the GC-DMRS and GC-PDCCH is located at symbols 1, 3, or 7 in a slot, wherein the search space of the GC-PDCCH Including one or the first UE-specific PDCCH of the UE.
  • the first UE-specific PDCCH uses the NR DCI 1_0 format.
  • one of the one or more combinations of GC-DMRS and GC-PDCCH is located at symbol 0 in a slot, where, outside the search space of the GC-PDCCH, it is in the UE-specific
  • the search space of the PDCCH includes one or more UE-specific PDCCHs.
  • this application provides a network-side device, including devices or single-board devices, and a terminal-side device, including terminals, chips, or other possible devices.
  • a communication system in another aspect, includes: a network device and a terminal, wherein the network device may be the aforementioned network device.
  • the aforementioned terminal The aforementioned terminal.
  • a computer-readable storage medium stores instructions that, when run on a computer, cause the computer to execute the signal transmission method described above.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute the above-mentioned signal transmission method.
  • FIG. 1 is a schematic diagram of the architecture of a wireless communication system provided by the present application.
  • FIG. 2 is a schematic diagram of the hardware architecture of a terminal device provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the hardware architecture of a network device provided by an embodiment of the present application.
  • 4A-4B are schematic diagrams of Type A/Type B multi-carrier LBT mechanisms involved in this application.
  • FIG. 5 is a schematic diagram of a frame structure conforming to the time slot in LTE involved in this application;
  • Fig. 6 is a schematic diagram of a mini-slot frame structure according to an embodiment of the present application.
  • FIG. 7 is a simple schematic diagram of the symbol position of the initial signal sent by the gNB or the cell in an embodiment of the present application.
  • 8a, 8b, 8c, and 8d are simple schematic diagrams of the detected symbol positions of the initial signal inside and outside the COT in an embodiment of the present application;
  • Fig. 9 is a functional block diagram of the wireless communication system, terminal and network equipment provided by the present application.
  • FIG. 1 shows a wireless communication system 100 involved in the present application.
  • the wireless communication system 100 may work in an authorized frequency band or an unlicensed frequency band. It is understandable that the use of unlicensed frequency bands can increase the system capacity of the wireless communication system 100.
  • the wireless communication system 100 includes: one or more network devices (Base Station) 101, such as a network device (such as gNB), eNodeB or WLAN access point, one or more terminals (Terminal) 103, and Core network 115. among them:
  • the network device 101 may be used to communicate with the terminal 103 under the control of a network device controller (such as a base station controller) (not shown).
  • a network device controller such as a base station controller
  • the network device controller may be a part of the core network 115, or may be integrated into the network device 101.
  • the network device 101 may be used to transmit control information (control information) or user data (user data) to the core network 115 through a backhaul (blackhaul) interface (such as an S1 interface) 113.
  • control information control information
  • user data user data
  • backhaul blackhaul interface
  • the network device 101 may perform wireless communication with the terminal 103 through one or more antennas. Each network device 101 can provide communication coverage for its corresponding coverage area 107.
  • the coverage area 107 corresponding to the access point may be divided into multiple sectors (sector), where one sector corresponds to a part of the coverage area (not shown).
  • the network device 101 and the network device 101 may also communicate with each other directly or indirectly through a backhaul (blackhaul) link 211.
  • the backhaul link 111 may be a wired communication connection or a wireless communication connection.
  • the network device 101 may include: a base transceiver station (Base Transceiver Station), a wireless transceiver, a basic service set (Basic Service Set, BSS), and an extended service set (Extended Service Set, ESS). ), NodeB, eNodeB, network equipment (such as gNB), etc.
  • the wireless communication system 100 may include several different types of network devices 101, such as a macro base station (macro base station), a micro base station (micro base station), and so on.
  • the network device 101 may apply different wireless technologies, such as cell wireless access technology or WLAN wireless access technology.
  • the terminal 103 may be distributed in the entire wireless communication system 100, and may be stationary or mobile.
  • the terminal 103 may include: a mobile device, a mobile station, a mobile unit, a wireless unit, a remote unit, a user agent, a mobile client, and so on.
  • a terminal can also be understood as a terminal device.
  • the wireless communication system 100 may be an LTE communication system capable of working in an unlicensed frequency band, such as an LTE-U system, or a new air interface communication system capable of working in an unlicensed frequency band, such as an NRU system, or it may be a future Other communication systems working in unlicensed frequency bands.
  • the wireless communication system 100 may also include a WiFi network.
  • FIG. 2 shows a terminal 300 provided by some embodiments of the present application.
  • the terminal 300 may include: an input and output module (including an audio input and output module 318, a key input module 316, a display 320, etc.), a user interface 302, one or more terminal processors 304, a transmitter 306, and a receiver 308, coupler 310, antenna 314, and memory 312. These components can be connected via a bus or in other ways.
  • Figure 2 uses a bus connection as an example. among them:
  • the communication interface 301 can be used for the terminal 300 to communicate with other communication devices, such as a base station.
  • the base station may be the network device 400 shown in FIG. 3.
  • the communication interface 301 refers to the interface between the terminal processor 304 and the transceiver system (consisting of the transmitter 306 and the receiver 308), such as the X1 interface in LTE.
  • the communication interface 301 may include: Global System for Mobile Communication (GSM) (2G) communication interface, Wideband Code Division Multiple Access (WCDMA) (3G) communication interface, and One or more of Long Term Evolution (LTE) (4G) communication interfaces, etc., can also be 4.5G, 5G, or future new air interface communication interfaces.
  • GSM Global System for Mobile Communication
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • 4G Long Term Evolution
  • the terminal 300 may also be configured with a wired communication interface 301, such as a local area access network (Local Access Network, LAN) interface.
  • the antenna 314 can be used to convert electromagnetic energy in a transmission line into electromagnetic waves in a free space, or convert electromagnetic waves in a free space into electromagnetic energy in a transmission line.
  • the coupler 310 is used to divide the mobile communication signal received by the antenna 314 into multiple channels and distribute them to multiple receivers 308.
  • the transmitter 306 may be used to transmit and process the signal output by the terminal processor 304, for example, modulate the signal in a licensed frequency band or modulate a signal in an unlicensed frequency band.
  • the receiver 308 can be used to receive and process the mobile communication signal received by the antenna 314. For example, the receiver 308 may demodulate the received signal modulated on the unlicensed frequency band, or may demodulate the received signal modulated on the licensed frequency band.
  • the transmitter 306 and the receiver 308 can be regarded as one wireless modem.
  • the number of the transmitter 306 and the receiver 308 may each be one or more.
  • the terminal 300 may also include other communication components, such as a GPS module, a Bluetooth (Bluetooth) module, a wireless high-fidelity (Wireless Fidelity, Wi-Fi) module, etc. Not limited to the above-mentioned wireless communication signals, the terminal 300 may also support other wireless communication signals, such as satellite signals, shortwave signals, and so on. Not limited to wireless communication, the terminal 300 may also be configured with a wired network interface (such as a LAN interface) to support wired communication.
  • a wired network interface such as a LAN interface
  • the input and output module can be used to realize the interaction between the terminal 300 and the user/external environment, and can mainly include an audio input and output module 318, a key input module 316, a display 320, and so on.
  • the input/output module may also include a camera, a touch screen, a sensor, and so on.
  • the input and output modules all communicate with the terminal processor 304 through the user interface 302.
  • the memory 312 is coupled with the terminal processor 304, and is used to store various software programs and/or multiple sets of instructions.
  • the memory 312 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices.
  • the memory 312 may store an operating system (hereinafter referred to as system), such as an embedded operating system such as ANDROID, IOS, WINDOWS, or LINUX.
  • system such as an embedded operating system such as ANDROID, IOS, WINDOWS, or LINUX.
  • the memory 312 may also store a network communication program, and the network communication program may be used to communicate with one or more additional devices, one or more terminal devices, and one or more network devices.
  • the memory 312 can also store a user interface program, which can vividly display the content of the application program through a graphical operation interface, and receive user control operations on the application program through input controls such as menu
  • the memory 312 may be used to store an implementation program on the terminal 300 side of the signal transmission method provided in one or more embodiments of the present application.
  • the implementation of the signal transmission method provided in one or more embodiments of the present application please refer to the subsequent embodiments.
  • the terminal processor 304 can be used to read and execute computer-readable instructions. Specifically, the terminal processor 304 may be used to call a program stored in the memory 312, such as a program for implementing the signal transmission method provided by one or more embodiments of the present application on the terminal 300 side, and execute the instructions contained in the program.
  • a program stored in the memory 312 such as a program for implementing the signal transmission method provided by one or more embodiments of the present application on the terminal 300 side, and execute the instructions contained in the program.
  • the terminal 300 may be the terminal 103 in the wireless communication system 100 shown in FIG. 1, and may be implemented as a mobile device, a mobile station, a mobile unit, a wireless unit, a remote unit, and a user agent. , Mobile client and so on.
  • the terminal 300 shown in FIG. 2 is only an implementation manner of the present application. In actual applications, the terminal 300 may also include more or fewer components, which is not limited here.
  • FIG. 3 shows a network device 400 provided by some embodiments of the present application.
  • the network device 400 may include: a communication interface 403, one or more base station processors 401, a transmitter 407, a receiver 409, a coupler 411, an antenna 413, and a memory 405. These components can be connected via a bus or in other ways.
  • Fig. 3 uses a bus connection as an example. among them:
  • the communication interface 403 can be used for the network device 400 to communicate with other communication devices, such as terminal devices or other base stations.
  • the terminal device may be the terminal 300 shown in FIG. 2.
  • the communication interface 301 refers to the interface between the base station processor 401 and the transceiver system (consisting of the transmitter 407 and the receiver 409), such as the S1 interface in LTE.
  • the communication interface 403 may include: a global system for mobile communications (GSM) (2G) communication interface, a wideband code division multiple access (WCDMA) (3G) communication interface, and a long-term evolution (LTE) (4G) communication interface, etc.
  • GSM global system for mobile communications
  • WCDMA wideband code division multiple access
  • LTE long-term evolution
  • the network device 400 may also be configured with a wired communication interface 403 to support wired communication.
  • the backhaul link between one network device 400 and another network device 400 may be a wired communication connection.
  • the antenna 413 can be used to convert electromagnetic energy in a transmission line into electromagnetic waves in a free space, or convert electromagnetic waves in a free space into electromagnetic energy in a transmission line.
  • the coupler 411 can be used to divide the mobile communication signal into multiple channels and distribute them to multiple receivers 409.
  • the transmitter 407 may be used to transmit and process the signal output by the base station processor 401, for example, modulate the signal in a licensed frequency band or modulate a signal in an unlicensed frequency band.
  • the receiver 409 can be used to receive and process the mobile communication signal received by the antenna 413.
  • the receiver 409 may demodulate the received signal modulated on the unlicensed frequency band, or may demodulate the received signal modulated on the licensed frequency band.
  • the transmitter 407 and the receiver 409 can be regarded as a wireless modem.
  • the number of the transmitter 407 and the receiver 409 may each be one or more.
  • the memory 405 is coupled with the base station processor 401, and is used to store various software programs and/or multiple sets of instructions.
  • the memory 405 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices.
  • the memory 405 may store an operating system (hereinafter referred to as the system), such as embedded operating systems such as uCOS, VxWorks, RTLinux, etc.
  • the memory 405 may also store a network communication program, which may be used to communicate with one or more additional devices, one or more terminal devices, and one or more network devices.
  • the base station processor 401 can be used to perform wireless channel management, implement call and communication link establishment and teardown, and control the handover of user equipment in the control area.
  • the base station processor 401 may include: an administration/communication module (Administration Module/Communication Module, AM/CM) (a center for voice channel exchange and information exchange), a basic module (Basic Module, BM) (for Complete call processing, signaling processing, wireless resource management, wireless link management and circuit maintenance functions), code conversion and submultiplexer (Transcoder and SubMultiplexer, TCSM) (used to complete multiplexing, demultiplexing and code conversion functions) )and many more.
  • an administration/communication module (Administration Module/Communication Module, AM/CM) (a center for voice channel exchange and information exchange), a basic module (Basic Module, BM) (for Complete call processing, signaling processing, wireless resource management, wireless link management and circuit maintenance functions), code conversion and submultiplexer (Transcoder and SubMultiplexer, TCSM) (used to complete multiplex
  • the base station processor 401 may be used to read and execute computer-readable instructions. Specifically, the base station processor 401 may be used to call a program stored in the memory 405, such as a program for implementing the signal transmission method provided by one or more embodiments of the present application on the network device 400 side, and execute instructions contained in the program.
  • a program stored in the memory 405 such as a program for implementing the signal transmission method provided by one or more embodiments of the present application on the network device 400 side, and execute instructions contained in the program.
  • the network device 400 may be the network device 101 in the wireless communication system 100 shown in FIG. 1, and may be implemented as a base transceiver station, a wireless transceiver, a basic service set (BSS), and an extended service set (ESS). , NodeB, eNodeB, etc.
  • the network device 400 may be implemented as several different types of base stations, such as macro base stations, micro base stations, and so on.
  • the network device 400 may apply different wireless technologies, such as cell wireless access technology or WLAN wireless access technology.
  • the network device 400 shown in FIG. 3 is only an implementation manner of the present application. In actual applications, the network device 400 may also include more or fewer components, which is not limited here.
  • the NRU system adopts the LBT channel contention access mechanism, and the LBT process and parameters are specified in the R13 version of 3GPP.
  • Figures 4A-4B show two types of LBT listening mechanisms.
  • Type A LBT devices can perform independent backoffs on multiple component carriers (CC). When backoff is completed on a certain carrier, the transmission is delayed to wait for other devices that are still backoff. Component carrier. When all the carriers performing LBT have completed backoff, the device needs to do an additional one-shot CCA (25us clear channel assessment) to ensure that all carriers are idle; if all the carriers are idle, the eNB simultaneously transmits on the idle carriers.
  • CCA 25us clear channel assessment
  • Type B LBT devices only perform backoff on a selected component carrier, and perform one-shot CCA (25us clear channel assessment) lookback on other component carriers when the backoff ends. If the component carrier is idle, data transmission is performed; if the component carrier is not idle, data transmission cannot be performed on the component carrier this time.
  • CCA clear channel assessment
  • the device performing LBT may be LTE LAA, WiFi, NRU or other communication devices operating in an unlicensed frequency band.
  • the interference received by the device performing LBT in the figure comes from the WiFi system.
  • the interference received by the device performing LBT can also come from LTE LAA, NRU or other communication systems working in unlicensed frequency bands. This application does not deal with this. limit.
  • the LBT interception mechanism adopted by the NR U system can also be changed, which does not affect the implementation of this application.
  • the frame structure applied in this application may be the radio frame structure of LTE or its evolved versions.
  • a typical frame structure specified by LTE includes 14 OFDM symbols (hereinafter referred to as symbols) in a scheduling slot (slot), and the first 1, 2, or 3 symbols carry control information. (DCI), the last 11, 12 or -13 symbols carry data.
  • DCI control information
  • a mini-slot is introduced, the length of which can be 2, 4, or 7 OFDM symbols.
  • one slot contains three mini-slots with a length of 4 symbols and one mini-slot with a length of 2 symbols. Of course, it can also be a combination of other mini-slots.
  • the control resource set (CORESET) of this mini-slot is carried on the first n symbols from the first symbol and used to carry the scheduling information (DCI) of the mini-slot.
  • n is a natural number, which is less than the number of symbols in the mini-slot.
  • n does not exceed 3.
  • GC-DCI and UE-specific DCI mentioned in this application The difference between the two is that GC-DCI is scrambled by GC-RNTI, and all UEs associated with gNB can use this GC-RNTI for analysis; UE-specific DCI Generally, each UE's own C-RNTI is used for scrambling, which includes the UE's own downlink scheduling information, and other UEs do not need or will not perform analysis.
  • the present application provides a signal transmission method, which provides a method for sending an initial signal after a successful LBT on the network side and performing initial signal detection on the UE side, and Corresponding devices and systems.
  • gNB needs to perform LBT to obtain channel access rights before sending downlink data or reference signals, that is, transmission can only be performed after LBT is successful. Since LBT may succeed at any moment, gNB may start downlink transmission at the beginning of a non-slot.
  • the numbers 0,1,2,...13 are the numbers of the symbols in a 14-symbol slot, and gNB can start transmission at symbols 0, 1, 3, or 7 in a slot.
  • the first slot is an incomplete slot (the number of symbols contained in this slot is less than 14), and there may be 1 or more complete slots for downlink transmission, the last in COT
  • the slot may also be an incomplete slot (the subsequent slot is not shown in Figure 6).
  • the DMRS of the PDCCH or the group-common DMRS of the PDCCH can be used for downlink transmission detection, that is, the UE can detect the above DMRS to determine whether the gNB has passed the LBT and start downlink transmission (at least DMRS of any[PDCCH or GC- PDCCH] can be used by UE to detect transmission bursts by the serving gNB).
  • detecting DMRS of GC-PDCCH is more advantageous than detecting UE-specific DMRS of PDCCH, because all UEs in the serving cell need to obtain the initial signal (DMRS of GC-PDCCH is more preferred than DMRS of UE specific PDCCH) because the initial signal is required by all UE within the serving cell.)
  • the DMRS used for downlink detection is sparse in time and frequency resources, resulting in poor detection performance.
  • both group-common DMRS (GC-DMRS) and GC-PDCCH are used by the UE for downlink transmission detection to improve the reliability of detection (The group common PDCCH together with its DMRS should be used by the UE) identify the DL burst from serving cell.).
  • the above Group-common PDCCH is a group public downlink physical control channel, used to carry GC-DCI, GC-DCI can be used to carry system common messages, such as the remaining length of the COT, or, each slot in the remaining time of the COT is uplink Still going down, wait.
  • At least the GC-DMRS and GC-PDCCH should be sent at the beginning of the COT.
  • GC-DMRS and GC-PDCCH can be sent multiple times in the COT.
  • one or more GC-DMRS and GC-PDCCH combinations sent by gNB after successful LBT can be used as Initial signal.
  • the UE judges the downlink transmission (DL burst) based on the GC-DMRS and GC-PDCCH received for the first time.
  • the subsequent GC-DMRS and GC-PDCCH received by the UE in the COT do not need to be used to determine the start of the COT, and only need to be processed according to the public control information carried in the recently received GC-PDCCH.
  • the GC-PDCCH sent each time carries common control information, such as GC-DCI, which is used to indicate or update the structure of the COT, such as indicating the remaining time of the COT, indicating the uplink and downlink structures in the remaining one or more slots, and so on.
  • the formula for the UE to perform PDCCH blind detection in the configured CORESET is as follows:
  • L is the aggregation level, which may be 1, 2, 4, 8, 16.
  • the number of symbols configured by CORESET is 1, 2, or 3.
  • N CCE,p is the number of control channel elements (CCEs, Control channel elements) included in the subband, for example, a total of 8 CCEs are included in a 20MHz bandwidth and 30kHz subcarrier spacing configuration. among them This is the number of blind PDCCH detections performed by the gNB on the carrier n CI for configuring the UE when the aggregation level in the search space S is L.
  • n CI 0. Configure the maximum number of blind PDCCH detections for the gNB when the aggregation level is L for the UE on all carriers.
  • each UE in a cell needs to detect the start of downlink transmission (the start of COT) according to an initial signal (initial signal).
  • the start of COT the start of downlink transmission
  • an initial signal initial signal
  • the following embodiments provide a better detection method for initial signal, which can reduce the complexity of UE blind detection of initial signal.
  • 101.gNB or cell sends GC-DMRS and GC-PDCCH (GC-DCI is carried on GC-PDCCH) after successful LBT or the initial stage of COT.
  • GC-DMRS and GC-PDCCH transmitted together, or a combination of GC-DMRS and GC-PDCCH may be located on the same one or more symbols (for example, 2 or 3) in the time domain, and in the frequency domain The upper can be located on different REs in the same RB.
  • the GC-DMRS and GC-PDCCH that a cell sends together for the first time after the LBT is successful are used by the UE receiving the combination of the GC-DMRS and GC-PDCCH as the initial signal for downlink transmission (initial signal).
  • the combination of GC-DMRS and GC-PDCCH can be sent multiple times in the COT. Specifically, if any one of the multiple combinations of GC-DMRS and GC-PDCCH is the first combination of GC-DMRS and GC-PDCCH received by a UE, then the first GC-DMRS received by the UE The combination of DMRS and GC-PDCCH is used as the initial signal of downlink transmission, that is, the UE judges or determines that the downlink transmission has started according to the first combination of GC-DMRS and GC-PDCCH it receives. Not all slots are shown in Figure 7.
  • each transmitted GC-DMRS and GC-PDCCH transmitted each time may include one or more of the current remaining length of COT, the uplink and downlink indications of one or more subsequent slots, and other common information.
  • Example 1 According to the cell size and UE feedback, in the search space of the initial signal (GC-DMRS and GC-PDCCH received for the first time) configured by the network side (such as gNB or cell) for one or more UEs, in the initial signal
  • the aggregation level (aggregation level) of the GC-PDCCH is set to a fixed value.
  • the value can be directly given by the standard, or the gNB can notify the UE in advance through broadcast information/proprietary signaling methods such as PBCH, RMSI, OSI, RRC.
  • the RRC shown in Table 1 is a specific example.
  • the fixed value may be 4. In another example, the fixed value may be 8. Of course, it can also be 1, 2 or 16.
  • the aggregation level of the GC-PDCCH in the initial signal of one cell is set to a fixed value and will not change. It can be the same as the aggregation level of the GC-PDCCH in the initial signal of another cell, or it can Not the same. Compared with the setting of ordinary GC-PDCCH, the aggregation level of ordinary GC-PDCCH may be set to a different value or change according to the transmission situation.
  • Ordinary GC-PDCCH refers to other GC-PDCCHs that are sent in COT and whose GC-PDCCH configuration in initial signal can be different.
  • the network side (for example, gNB or cell) can configure the number of blind detection of the initial signal in the search space of the initial signal (GC-DMRS and GC-PDCCH received for the first time) of one or more UEs or the number of times that needs to be detected The position of the symbol.
  • the value of can be 1 or 2.
  • the value can be directly given by the standard, or the gNB can notify the UE in advance through broadcast information/proprietary signaling methods such as PBCH, RMSI, OSI, RRC.
  • one of the combination of GC-DMRS and GC-PDCCH sent by the network side in NR-U may be used as the initial signal by a certain UE.
  • the first received GC-DMRS and GC by a certain UE -The combination of PDCCH will be used as the initial signal.
  • the combination of GC-DMRS and GC-PDCCH sent by the network element on the network side has the following characteristics:
  • each combination of GC-DMRS and GC-PDCCH corresponds to a COT.
  • multiple combinations of GC-DMRS and GC-PDCCH sent may correspond to the same COT, and each GC-DMRS and GC-PDCCH respectively carry the updated common control information in the COT.
  • the combined detection frequency (density) of GC-DMRS and GC-PDCCH inside and outside COT is different.
  • the detection of the first X symbols in each slot in the COT for example, only the first symbol (symbol 0) is detected; after the end of COT (outside the COT), the set of detected symbol positions configured in each slot ⁇ Detect.
  • the configured set of detected symbol positions may preferably be symbols 0, 1, 3, or 7, or a combination of GC-DMRS and GC-PDCCH for every two symbols. Refer to the detected symbol positions of the initial signals inside and outside the COT shown in FIGS. 8a, 8b, 8c and 8d. Of course, in other embodiments, different symbols can be detected according to the configuration.
  • the aggregation level of GC-DMRS and GC-PDCCH as the initial signal is fixed, and the number of candidates for blind detection corresponding to the aggregation level is set to 1 or 2, which means that only on each detected symbol Blind inspection 1 or 2 times. Or it is called the maximum number of blind checks of the GC-PDCCH in the initial signal.
  • the aggregation level of the GC-PDCCH that is not used as the initial signal may be configured to other values, and may not be fixed.
  • search space configuration signaling of GC-DMRS and/or GC-PDCCH in the prior art, and configuration signaling of search space of GC-DMRS and GC-PDCCH (such as RRC) that can be used as initial signals by the UE. It can be added to the existing GC-DMRS and/or GC-PDCCH search space configuration signaling, or it can be notified separately by the gNB or configured to the UE. That is, the network side may send configuration signaling (independently or together with other configuration signaling) for the search space of the initial signal of one or more UEs.
  • Table 1 shows specific examples of the aforementioned RRC.
  • the SearchSpaceId in Table 1 may be used to indicate that the configuration signaling is a search space for the initial signal of one or more UEs (for example, a group of UEs in a cell).
  • the number of blind detections on each detected symbol for the initial signal in COT is 1, and the position of blind detection is symbol 0; the number of blind detections for the initial signal outside COT on each detected symbol If it is 1, the position of blind detection is the symbol 0, 1, 3, 7.
  • the number of blind detection of the initial signal in the COT on each detected symbol is 1, and the position of the blind detection is symbol 0, symbol 1, or symbol 2, or any combination of symbols 0, 1, and 2.
  • the network side (gNB or cell) sends one or more combinations of GC-DMRS and GC-PDCCH according to the configuration of the initial signal.
  • the gNB uses the mini-slot method to perform downlink data transmission in the first partial slot.
  • a 2-slot mini-slot has only 2 symbols available for transmission, and both GC-DMRS and GC-PDCCH need to occupy the above resources. Therefore, it is better to include one (or multiple UEs) UE-specific PDCCH in the search space of the GC-PDCCH.
  • the UE-specific PDCCH is fallback DCI, for example, the NR DCI 1_0 format may be used, that is, fewer bits are used to carry downlink control indication information, which saves control information overhead and improves mini-slot transmission efficiency.
  • the gNB uses a complete slot for downlink data transmission.
  • the UE-specific PDCCH of one or more UEs is sent in the configured UE-specific search space, and the one or more UE-specific PDCCHs do not need to adopt the NR DCI 1_0 format.
  • step 201 The UE detects the received signal, and uses the GC-DMRS and GC-PDCCH detected for the first time as the initial signal to determine that the gNB has started downlink transmission.
  • the combination of GC-DMRS and GC-PDCCH detected by the UE for the first time may be the combination of GC-DMRS and GC-PDCCH sent for the first time after successful LBT on the network side, or it may be sent by gNB after COT starts.
  • a combination of GC-DMRS and GC-PDCCH may be the combination of GC-DMRS and GC-PDCCH sent for the first time after successful LBT on the network side, or it may be sent by gNB after COT starts.
  • the COT can also continue to search according to the general search space configuration of GC-DMRS and ⁇ or GC-PDCCH and obtain relevant public control information for downlink information Received.
  • the initial signal (GC-DMRS and GC-PDCCH) will be continued according to the search space of the initial signal. Combination) search.
  • 201 in the above method includes:
  • Step 201a If it is detected that the start symbol of GC-DMRS and GC-PDCCH (start downlink transmission) is symbol 0, (that is, the first slot is the complete slot, full slot), the UE only needs to be in the 0th or the first X (X is configured by gNB) UE-specific PDCCH detection continues on the symbol, where UE-specific PDCCH is a general format. In some cases, the subsequent GC-DMRS and GC-PDCCH are also detected according to the search space setting of the UE. Referring to FIG. 8a, according to the configuration, there may be no need to detect the initial signal in the slot, and the initial signal may be detected in one or more subsequent complete slots to obtain updated common control information.
  • Step 201b If it is detected that the start symbol of GC-DMRS and GC-PDCCH (start downlink transmission) is other symbols after symbol 0 (that is, when the first slot is a partial slot), the UE still Use your own C-RNTI in the search space of the GC-PDCCH to blindly detect UE-specific PDCCH.
  • the UE-specific PDCCH carries the fallback DCI, for example, in the NR DCI 1_0 format. Referring to Figure 8b, Figure 8c and Figure 8d, depending on the configuration, it is not necessary to detect the initial signal at the symbol position after the initial signal is detected in the slot, but the initial signal can be detected in one or more subsequent complete slots To obtain updated public control information.
  • Step 201b If GC-DMRS and GC-PDCCH are detected and own UE-specific PDCCH is detected, then further analyze the downlink data in the mini-slot.
  • Step 201b2 If GC-DMRS and GC-PDCCH are detected, but their UE-specific PDCCH is not detected, then in other search space of GC-PDCCH (such as the next mini-slot or the starting position of the slot) or UE -specific search space continues to detect UE-specific PDCCH.
  • a specific example of the above scheme includes:
  • UE1 After UE1 detects GC-PDCCH and GC-DMRS in symbol 1 (the second symbol) in the first incomplete slot, but does not find its own PDCCH in the search space of GC-PDCCH, it tries to In the GC-PDCCH search space (such as other symbols in the incomplete slot (such as symbol 3 or symbol 7)) continue to detect whether there is a fallback PDCCH scrambled by its C-RNTI or whether there is a C in the UE specific search space. -RNTI scrambled PDCCH.
  • the UE If it does not detect its own UE-specific PDCCH in the incomplete slot (such as symbol 3 or symbol 7), in the second complete slot or subsequent complete slots, the UE only needs to be in the 0th or first X ( X is configured by gNB, for example, 3) GC-PDCCH and GC-DMRS (search space for GC-PDCCH and GC-DMRS) are detected on the symbol, and further in UE-specific after detecting GC-PDCCH and GC-DMRS The search space detects UE-specific PDCCH.
  • X is configured by gNB, for example, 3
  • GC-PDCCH and GC-DMRS search space for GC-PDCCH and GC-DMRS
  • the sending side sends GC-PDCCH and ⁇ or GC-DMRS multiple times, after receiving the GC-PDCCH, the UE can obtain the updated COT remaining length, the uplink and downlink indications of subsequent slots and other public information, and receive UE-specific After the PDCCH, you can obtain whether there is any downlink data sent to you by the gNB in the slot.
  • the aforementioned UE-specific PDCCH may be carried in the GC-PDCCH search space, and may also be carried in the UE-specific PDCCH search space configured by the gNB.
  • the GC-PDCCH search space or UE-specific PDCCH search space is configured by the gNB through RRC, RMSI, or OSI signaling in advance, or directly provided by the standard.
  • the gNB can configure a BWP (bandwidth part, partial bandwidth) for the UE for downlink data reception.
  • the BWP may include one or more sub-channels, where the bandwidth of the sub-channels is the same as the bandwidth for LBT in the NRU.
  • the bandwidth of the sub-channel is 20 MHz
  • the BWP may be an integer multiple of 20 MHz, such as 80 MHz.
  • sub-channel information includes: the remaining COT time of the sub-channel through the LBT and/or the uplink and downlink configuration of each slot.
  • 301.gNB passes LBT on multiple sub-channels, and gNB can (all) send GC-DMRS and GC-PDCCH on the multiple sub-channels respectively.
  • the GC-PDCCH on one subchannel only carries the information of the one subchannel, and does not carry the information of other subchannels.
  • the UE needs to blindly detect GC-DMRS and/or GC-PDCCH and UE-specific PDCCH in each sub-channel in the configured BWP.
  • GC-DMRS, GC-PDCCH and UE-specific are detected on the sub-channel with high priority PDCCH, you can stop detecting other sub-channels.
  • the priority order of the subchannels for each UE may be different or the same.
  • 501.gNB uses LBT on multiple subchannels, and the gNB can send GC-DMRS and GC-PDCCH on one of the multiple subchannels.
  • the one may be determined according to rules such as priority, for example, the certain sub-channel is the sub-channel with the highest priority through the LBT.
  • the GC-PDCCH on one subchannel may contain information of multiple subchannels.
  • the GC-PDCCH on one subchannel includes the information of the one subchannel and the information of other subchannels.
  • the UE-specific PDCCH does not support cross-subchannel scheduling, that is, the UE-specific PDCCH sent on a subchannel only schedules or indicates the time-frequency resources on that subchannel, and cannot schedule or indicate other The time-frequency resources on the sub-channels are used for downlink transmission.
  • the UE on the receiving side, 601, after the UE detects GC-DMRS and GC-PDCCH in one or part of the configured BWP sub-channels, it can obtain information of multiple sub-channels that have passed the LBT according to the GC-PDCCH; Then, blindly detect UE-specific PDCCH scrambled by its own C-RNTI in the GC-PDCCH search space corresponding to each sub-channel of the LBT (for example, fallback PDCCH in mini-slot (can use NR DCI format 1_0), or , General UE-specific PDCCH).
  • fallback PDCCH in mini-slot can use NR DCI format 1_0
  • General UE-specific PDCCH General UE-specific PDCCH
  • one or part of the sub-channels in the aforementioned configured BWP may be determined according to rules such as priority.
  • the aforementioned "blind detection of UE-specific PDCCH scrambled by its own C-RNTI in the GC-PDCCH search space corresponding to each sub-channel through the LBT" may be performed blindly in the order of priority of the sub-channels.
  • the gNB passes the LBT on multiple sub-channels, and the gNB can send GC-DMRS and GC-PDCCH on one of the multiple sub-channels that pass the LBT.
  • the GC-PDCCH on one subchannel may contain information of multiple subchannels
  • the UE-specific PDCCH supports cross-subchannel scheduling.
  • Cross-subchannel scheduling means that the UE-specific PDCCH sent on one subchannel can schedule or indicate the time-frequency resources on the one subchannel and other subchannels for downlink transmission.
  • the gNB only transmits GC-DMRS and/or GC-PDCCH and UE-specific PDCCH (if any) on a certain subchannel through the LBT.
  • the one or part of the subchannels may be determined according to rules such as priority, for example, the certain subchannel is the subchannel with the highest priority through LBT; the "partial subchannel" is Pass multiple sub-channels with the highest priority to the second highest priority of LBT.
  • the gNB may only transmit GC-DMRS but not GC-PDCCH on other subchannels, or the gNB may transmit neither GC-DMRS nor GC-PDCCH on other subchannels.
  • the UE on the receiving side, 801, after the UE detects GC-DMRS and GC-PDCCH in a certain subchannel in the configured BWP, it can obtain information of multiple subchannels that have passed the LBT according to the GC-PDCCH: for example, Common information such as the COT information of each sub-channel in all sub-channels passing through the LBT in the BWP, the uplink and downlink configuration on multiple sub-channels in the COT, and the corresponding downlink data scheduling information on each sub-channel can also be obtained.
  • Common information such as the COT information of each sub-channel in all sub-channels passing through the LBT in the BWP, the uplink and downlink configuration on multiple sub-channels in the COT, and the corresponding downlink data scheduling information on each sub-channel can also be obtained.
  • the UE continues to blindly detect the UE-specific PDCCH scrambled by its own C-RNTI in the GC-PDCCH search space of this subchannel (it carries the fallback DCI in the mini-slot (which can use NR DCI format 1_0), or general UE-specific PDCCH).
  • the gNB can transmit any combination of the aforementioned GC-PDCCH, UE-specific PDCCH, or GC-DMRS on one or more subchannels that follow certain rules.
  • Blind detection of each sub-channel can reduce the overhead of the UE blind detection of the aforementioned PDCCH.
  • the rule refers to the priority order of sub-channels.
  • the gNB only sends any combination of GC-PDCCH, UE-specific PDCCH, or GC-DMRS on a subchannel that meets a certain rule; accordingly, the UE only sends any combination of GC-PDCCH, UE-specific PDCCH, or GC-DMRS Blind detection is performed on a subchannel, thereby further reducing the overhead of the UE blindly detecting the PDCCH.
  • the foregoing rule may be that one or more specific sub-channels correspond to a priority, or each sub-channel corresponds to a priority.
  • the foregoing priority may be fixed or change over time, and the foregoing priority information may be configured in advance by the gNB.
  • a BWP configured by a UE includes 4 subchannels: subchannels 0, 1, 2, 3, and the priority of sending PDCCH on the 4 subchannels is ⁇ subchannel 1, 3, 2, 0 ⁇ .
  • the UE When gNB only sends GC-DMRS and GC-PDCCH on one sub-channel through LBT, the UE will detect GC-DMRS and GC-PDCCH in the order of sub-channels 1, 3, 2, 0; that is, in the sub-channel When GC-DMRS and GC-PDCCH are not detected on subchannel 3, perform detection on subchannel 3; when GC-DMRS and GC-PDCCH are not detected on subchannel 3, perform detection on subchannel 2; When GC-DMRS and GC-PDCCH are not detected on subchannel 2, detection is performed on subchannel 0 again.
  • the gNB transmits GC-DMRS on all sub-channels passing through LBT, and only transmits GC-PDCCH on a certain sub-channel of the sub-channels passing through LBT (for example, the highest priority of the sub-channels passing through LBT).
  • the UE first detects the GC-DMRS on all subchannels in the BWP, and then detects the GC-PDCCH on the subchannel with the highest priority among the subchannels in which the GC-DMRS is detected.
  • the UE learns that subchannels 2, 3 pass LBT through GC-DMRS, and according to the priority of each subchannel ⁇ subchannel 1, 3, 2, 0 ⁇ , it can be known that the gNB only sends PDCCH on subchannel 3. Correspondingly, the UE will only blindly detect the GC-PDCCH and UE-specific PDCCH on subchannel 3, which further reduces the blind detection overhead.
  • the way for the UE to parse the UE-specific PDCCH may be the same as that of the GC-PDCCH.
  • the UE obtains the sub-channel LBT information in the BWP after parsing the GC-PDCCH, and then sequentially detects possible UE-specific PDCCH (for example, according to priority) on each sub-channel of the LBT. In order).
  • the specific blind detection process of the UE on a certain subchannel in the foregoing examples can refer to the solution in Embodiment 1, or it can be a reasonable modification or combination of Embodiment 1. Of course, it may also be other possible detection solutions. Do not repeat it here.
  • an embodiment of the present invention also provides a wireless communication system.
  • the wireless communication system may be the wireless communication system 100 shown in FIG. 1, or may be the wireless communication system 10 shown in FIG. 9, and may include: network equipment And terminal.
  • the terminal may be the terminal in the foregoing embodiment, and the network device may be the network device in the foregoing embodiment.
  • the terminal may be the terminal 300 shown in FIG. 2, and the network device may be the network device 400 shown in FIG. 3.
  • the terminal may also be the terminal 400 shown in FIG. 9, and the network device shown may also be the network device 500 shown in FIG. 9.
  • the specific implementation of the network and the terminal reference may be made to the foregoing embodiment, which will not be repeated here.
  • the network device processor 405 is configured to control the transmitter 407 to transmit in the unlicensed frequency band and/or authorized frequency band, and to control the receiver 409 to receive in the unlicensed frequency band and/or authorized frequency band.
  • the transmitter 407 is used to support the network device to perform the process of transmitting data and/or signaling.
  • the receiver 409 is used to support the network device to perform a process of receiving data and/or signaling.
  • the memory 405 is used to store program codes and data of the network device.
  • the transmitter 407 of the network device may be used to execute the above-mentioned method for sending initial signals such as 101, 301, 501 or 701 and other signals.
  • initial signals such as 101, 301, 501 or 701 and other signals.
  • the terminal processor 304 is configured to call instructions stored in the memory 312 to control the transmitter 306 to transmit in the unlicensed frequency band and/or the licensed frequency band and to control the receiver 308 to transmit in the unlicensed frequency band. And/or authorized frequency band to receive.
  • the transmitter 306 is used to support the terminal to perform a process of transmitting data and/or signaling.
  • the receiver 308 is used to support the terminal to perform a process of receiving data and/or signaling.
  • the memory 312 is used to store program codes and data of the terminal.
  • the receiver 308 can be used in methods such as 201, 401, 601, or 801.
  • methods such as 201, 401, 601, or 801.
  • the transmitter 306 may be used to send uplink data on the monitored idle frequency domain resources.
  • the device on the sending side can be divided into LBT modules to implement the LBT function of Figures 4A and/or 4B, and can be divided into initial signal sending modules.
  • the above-mentioned modules are likely to be integrated in software and hardware, such as processors or integrated circuits.
  • the steps of the method or algorithm described in combination with the disclosure of the embodiments of the present invention may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions.
  • Software instructions can be composed of corresponding software modules, which can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (Erasable Programmable ROM, EPROM), and electrically erasable programmable read-only memory (Electrically EPROM, EEPROM), registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium may also be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the ASIC may be located in the transceiver or relay device.
  • the processor and the storage medium may also exist as discrete components in the wireless access network device or terminal device.
  • the functions described in the embodiments of the present invention can be implemented by hardware, software, firmware, or any combination thereof.
  • these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium.
  • the computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another.
  • the storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

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Abstract

一种初始信号检测方法与装置，包括：UE在非授权频谱的一个或者多个子信道上进行检测；根据首次检测到的GC-DMRS和GC-PDCCH的组合，确定下行传输已经开始或者确定COT已经开始。

Description

初始信号传输方法、装置
本申请要求于2019年2月15日提交中国专利局、申请号为201910117894.5、发明名称为“初始信号传输方法、装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种初始信号检测方法及装置。
背景技术
工作在非授权频段(unlicensed band)的设备不需授权即可自行检测信道是否空闲并接入信道进行工作。为了保证和其他在非授权频段工作的设备共存和公平性，3GPP的R13版本中，规定了采用先听后说(LBT:Listen-Before-Talk)的信道竞争接入机制。
工作于非授权频段的eNB可以随时开始LBT，由于其它系统产生的干扰出现和持续时间的不确定性，LBT可能在任意时刻结束。如何高效的利用LBT成功后的时域资源，是本申请关注的问题。
发明内容
本申请提供了应用于非授权频谱的更高效的初始信号检测机制。
一方面提供了一种初始信号检测方法，包括：UE在非授权频谱的一个或者多个子信道上进行检测；根据首次检测到的GC-DMRS和GC-PDCCH的组合，确定下行传输已经开始或者确定COT已经开始。其中，所述UE的初始信号的搜索空间(search space)的配置符合下述之一或者任意组合：初始信号中的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值；或者，初始信号中的GC-PDCCH的最大的盲检的次数为每个slot中1或2次。
上述配置可以是标准规定的，或者网络侧对一个或者多个UE(例如小区中的UE组)进行配置的。较优的，所述UE所述首次检测到的GC-DMRS和GC-PDCCH的组合位于一个slot中的符号1、3或者7，所述方法还包括：该UE在GC-PDCCH的搜索空间(search space)中继续检索自己的第一UE-specific PDCCH。该第一UE-specific PDCCH使用NR DCI 1_0格式。
在另一方面，提供了相应的初始信号发送方法，包括：网络侧在非授权频谱的一个或者多个子信道上进行LBT；所述网络侧在LBT成功的一个或者多个子信道上发送一个或者多个GC-DMRS和GC-PDCCH的组合，其中，所述一个或者多个GC-DMRS和GC-PDCCH的组合中的一个被作为下行传输的初始信号。其中，一个或者多个UE的初始信号的搜索空间(search space)的配置符合下述之一或者任意组合：初始信号中的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值；或者，初始信号中的GC-PDCCH的最大的盲检的次数为每个被检测的符号1或2次。上述配置可以是标准规定好的，即通信系统初始化时直接配置好的，另外，也可以是网络侧发送所述一个或者多个UE的初始 信号的搜索空间(search space)的配置信息。具体的，前述发送的第一个所述GC-DMRS和GC-PDCCH的组合位于COT的起始位置。另外的例子中，所述发送的一个或者多个所述GC-DMRS和GC-PDCCH的组合中的一个位于一个slot中的符号1、3或者7，其中，所述GC-PDCCH的search space中包括一个或者UE的第一UE-specific PDCCH。所述第一UE-specific PDCCH使用NR DCI 1_0格式。另外的例子中，所述一个或者多个所述GC-DMRS和GC-PDCCH的组合中的一个位于一个slot中的符号0，其中，在所述GC-PDCCH的search space以外，在UE-specific PDCCH的搜索空间中包含一个或者多个UE-specific PDCCH。
本申请相应的提供了一种网络侧的装置，包括设备或者单板等装置，以及，终端侧装置，包括终端，芯片，或者其他可能的装置。
其他方面，提供了一种通信系统，所述通信系统包括：网络设备和终端，其中：所述网络设备可以是前述的网络设备。所述终端前述的终端。
其他方面，提供了一种计算机可读存储介质，所述可读存储介质上存储有指令，当其在计算机上运行时，使得计算机执行上述描述的信号传输方法。
其他方面，，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述的信号传输方法。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请提供的一种无线通信系统的架构示意图；
图2是本申请的一个实施例提供的终端设备的硬件架构示意图；
图3是本申请的一个实施例提供的网络设备的硬件架构示意图；
图4A-4B是本申请涉及的Type A/Type B多载波LBT机制的示意图；
图5是本申请涉及的符合LTE中时隙帧结构示意图；
图6是本申请一个实施例的一个微时隙帧结构示意图；
图7是本申请的一个实施例中gNB或者小区发送初始信号的符号位置的简单示意图；
图8a，8b，8c和8d是本申请的一个实施例中COT内和COT外的初始信号的检测的符号位置的简单示意图；
图9是本申请的提供的无线通信系统，终端和网络设备的功能框图。
具体实施方式
本申请的实施方式部分使用的术语仅用于对本申请的具体实施例进行解释，而非旨在限定本请。
参考图1，图1示出了本申请涉及的无线通信系统100。无线通信系统100可以工作在授权频段，也可以工作在非授权频段。可以理解的，非授权频段的使用可以提高无线通信系统100的系统容量。如图1所示，无线通信系统100包括：一个或多个网络设备(Base Station)101，例如网络设备(如gNB)、eNodeB或者WLAN接入点，一个或多个终端(Terminal)103，以及核心网115。其中：
网络设备101可用于在网络设备控制器(如基站控制器)(未示出)的控制下与终端103通信。在一些实施例中，所述网络设备控制器可以是核心网115的一部分，也可以集成到网络设备101中。
网络设备101可用于通过回程(blackhaul)接口(如S1接口)113向核心网115传输控制信息(control information)或者用户数据(user data)。
网络设备101可以通过一个或多个天线来和终端103进行无线通信。各个网络设备101均可以为各自对应的覆盖范围107提供通信覆盖。接入点对应的覆盖范围107可以被划分为多个扇区(sector)，其中，一个扇区对应一部分覆盖范围(未示出)。
网络设备101与网络设备101之间也可以通过回程(blackhaul)链接211，直接地或者间接地，相互通信。这里，回程链接111可以是有线通信连接，也可以是无线通信连接。
在本申请的一些实施例中，网络设备101可以包括：基站收发台(Base Transceiver Station)，无线收发器，一个基本服务集(Basic Service Set，BSS)，一个扩展服务集(Extended Service Set，ESS)，NodeB，eNodeB，网络设备(如gNB)等等。无线通信系统100可以包括几种不同类型的网络设备101，例如宏基站(macro base station)、微基站(micro base station)等。网络设备101可以应用不同的无线技术，例如小区无线接入技术，或者WLAN无线接入技术。
终端103可以分布在整个无线通信系统100中，可以是静止的，也可以是移动的。在本申请的一些实施例中，终端103可以包括：移动设备，移动台(mobile station)，移动单元(mobile unit)，无线单元，远程单元，用户代理，移动客户端等等。本申请中，终端也可以理解为终端设备。
本申请中，无线通信系统100可以是能够工作在非授权频段的LTE通信系统，例如LTE-U系统，也可以是能够工作在非授权频段的新空口通信系统，例如NRU系统，还可以是未来工作在非授权频段的其他通信系统。
另外，无线通信系统100还可以包括WiFi网络。
参考图2，图2示出了本申请的一些实施例提供的终端300。如图2所示，终端300可包括：输入输出模块(包括音频输入输出模块318、按键输入模块316以及显示器320等)、用户接口302、一个或多个终端处理器304、发射器306、接收器308、耦合器310、天线314以及存储器312。这些部件可通过总线或者其他方式连接，图2以通过总线连接为例。其中：
通信接口301可用于终端300与其他通信设备，例如基站，进行通信。具体的，所述基站可以是图3所示的网络设备400。通信接口301是指终端处理器304与收发系统(由发射器306和接收器308构成)之间的接口，例如LTE中的X1接口。具体实现中，通信接口301可包括：全球移动通信系统(Global System for Mobile Communication，GSM)(2G)通信接口、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)(3G)通信接口，以及长期演进(Long Term Evolution，LTE)(4G)通信接口等等中的一种或几种，也可以是4.5G、5G或者未来新空口的通信接口。不限于无线通信接口，终端300还可以配置有有线的通信接口301，例如局域接入网(Local Access Network，LAN) 接口。
天线314可用于将传输线中的电磁能转换成自由空间中的电磁波，或者将自由空间中的电磁波转换成传输线中的电磁能。耦合器310用于将天线314接收到的移动通信信号分成多路，分配给多个的接收器308。
发射器306可用于对终端处理器304输出的信号进行发射处理，例如将该信号调制在授权频段的信号，或者调制在非授权频段的信号。
接收器308可用于对天线314接收的移动通信信号进行接收处理。例如，接收器308可以解调已被调制在非授权频段上的接收信号，也可以解调调制在授权频段上的接收信号。
在本申请的一些实施例中，发射器306和接收器308可看作一个无线调制解调器。在终端300中，发射器306和接收器308的数量均可以是一个或者多个。
除了图2所示的发射器306和接收器308，终端300还可包括其他通信部件，例如GPS模块、蓝牙(Bluetooth)模块、无线高保真(Wireless Fidelity，Wi-Fi)模块等。不限于上述表述的无线通信信号，终端300还可以支持其他无线通信信号，例如卫星信号、短波信号等等。不限于无线通信，终端300还可以配置有有线网络接口(如LAN接口)来支持有线通信。
所述输入输出模块可用于实现终端300和用户/外部环境之间的交互，可主要包括音频输入输出模块318、按键输入模块316以及显示器320等。具体实现中，所述输入输出模块还可包括：摄像头、触摸屏以及传感器等等。其中，所述输入输出模块均通过用户接口302与终端处理器304进行通信。
存储器312与终端处理器304耦合，用于存储各种软件程序和/或多组指令。具体实现中，存储器312可包括高速随机存取的存储器，并且也可包括非易失性存储器，例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。存储器312可以存储操作系统(下述简称系统)，例如ANDROID，IOS，WINDOWS，或者LINUX等嵌入式操作系统。存储器312还可以存储网络通信程序，该网络通信程序可用于与一个或多个附加设备，一个或多个终端设备，一个或多个网络设备进行通信。存储器312还可以存储用户接口程序，该用户接口程序可以通过图形化的操作界面将应用程序的内容形象逼真的显示出来，并通过菜单、对话框以及按键等输入控件接收用户对应用程序的控制操作。
在本申请的一些实施例中，存储器312可用于存储本申请的一个或多个实施例提供的信号传输方法在终端300侧的实现程序。关于本申请的一个或多个实施例提供的信号传输方法的实现，请参考后续实施例。
终端处理器304可用于读取和执行计算机可读指令。具体的，终端处理器304可用于调用存储于存储器312中的程序，例如本申请的一个或多个实施例提供的信号传输方法在终端300侧的实现程序，并执行该程序包含的指令。
可以理解的，终端300可以是图1示出的无线通信系统100中的终端103，可实施为移动设备，移动台(mobile station)，移动单元(mobile unit)，无线单元，远程单元，用户代理，移动客户端等等。
需要说明的，图2所示的终端300仅仅是本申请的一种实现方式，实际应用中，终 端300还可以包括更多或更少的部件，这里不作限制。
参考图3，图3示出了本申请的一些实施例提供的网络设备400。如图3所示，网络设备400可包括：通信接口403、一个或多个基站处理器401、发射器407、接收器409、耦合器411、天线413和存储器405。这些部件可通过总线或者其他方式连接，图3以通过总线连接为例。其中：
通信接口403可用于网络设备400与其他通信设备，例如终端设备或其他基站，进行通信。具体的，所述终端设备可以是图2所示的终端300。通信接口301是指基站处理器401与收发系统(由发射器407和接收器409构成)之间的接口，例如LTE中的S1接口。具体实现中，通信接口403可包括：全球移动通信系统(GSM)(2G)通信接口、宽带码分多址(WCDMA)(3G)通信接口，以及长期演进(LTE)(4G)通信接口等等中的一种或几种，也可以是4.5G、5G或者未来新空口的通信接口。不限于无线通信接口，网络设备400还可以配置有有线的通信接口403来支持有线通信，例如一个网络设备400与其他网络设备400之间的回程链接可以是有线通信连接。
天线413可用于将传输线中的电磁能转换成自由空间中的电磁波，或者将自由空间中的电磁波转换成传输线中的电磁能。耦合器411可用于将移动通信号分成多路，分配给多个的接收器409。
发射器407可用于对基站处理器401输出的信号进行发射处理，例如将该信号调制在授权频段的信号，或者调制在非授权频段的信号。
接收器409可用于对天线413接收的移动通信信号进行接收处理。例如，接收器409可以解调已被调制在非授权频段上的接收信号，也可以解调调制在授权频段上的接收信号。
在本申请的一些实施例中，发射器407和接收器409可看作一个无线调制解调器。在网络设备400中，发射器407和接收器409的数量均可以是一个或者多个。
存储器405与基站处理器401耦合，用于存储各种软件程序和/或多组指令。具体实现中，存储器405可包括高速随机存取的存储器，并且也可包括非易失性存储器，例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。存储器405可以存储操作系统(下述简称系统)，例如uCOS、VxWorks、RTLinux等嵌入式操作系统。存储器405还可以存储网络通信程序，该网络通信程序可用于与一个或多个附加设备，一个或多个终端设备，一个或多个网络设备进行通信。
基站处理器401可用于进行无线信道管理、实施呼叫和通信链路的建立和拆除，并为本控制区内用户设备的过区切换进行控制等。具体实现中，基站处理器401可包括：管理/通信模块(Administration Module/Communication Module，AM/CM)(用于话路交换和信息交换的中心)、基本模块(Basic Module，BM)(用于完成呼叫处理、信令处理、无线资源管理、无线链路的管理和电路维护功能)、码变换及子复用单元(Transcoder and SubMultiplexer，TCSM)(用于完成复用解复用及码变换功能)等等。
本申请中，基站处理器401可用于读取和执行计算机可读指令。具体的，基站处理器401可用于调用存储于存储器405中的程序，例如本申请的一个或多个实施例提供的信号传输方法在网络设备400侧的实现程序，并执行该程序包含的指令。
可以理解的，网络设备400可以是图1示出的无线通信系统100中的网络设备101，可实施为基站收发台，无线收发器，一个基本服务集(BSS)，一个扩展服务集(ESS)，NodeB，eNodeB等等。网络设备400可以实施为几种不同类型的基站，例如宏基站、微基站等。网络设备400可以应用不同的无线技术，例如小区无线接入技术，或者WLAN无线接入技术。
需要说明的，图3所示的网络设备400仅仅是本申请的一种实现方式，实际应用中，网络设备400还可以包括更多或更少的部件，这里不作限制。
为使后文描述方便，先提供本文可能涉及的技术术语。
Figure PCTCN2020075571-appb-000001
Figure PCTCN2020075571-appb-000002
为了保证和其他在非授权频段工作的设备共存，NRU系统采用LBT的信道竞争接入机制，并在3GPP的R13版本中对LBT的流程和参数进行了规定。图4A-4B示出了两种类型的LBT侦听机制。
如图4A所示，类型A(Type A)LBT设备可以在多个成员载波(component carrier，CC)上进行独立的退避，当在某个载波上退避完成后延迟传输来等待其他仍在退避的成员载波。当所有进行LBT的载波都完成退避后，该设备需要做额外的one-shot CCA(25us clear channel assessment)来保证所有载波空闲；如果所有载波空闲，则eNB在空闲载波上同时进行传输。
如图4B所示，类型B(Type B)LBT设备仅在某个选取的成员载波上进行退避，当退避结束时在其他成员载波上进行one-shot CCA(25us clear channel assessment)的回看，如果成员载波为空闲，则进行数据传输；如果该成员载波不空闲，则此次无法在该成员载波上进行数据传输。
如图4A-4B所示，进行LBT的设备可以是LTE LAA，WiFi，NRU或是其它工作于非授权(unlicensed)频段的通信设备。图中设备进行LBT收到的干扰来自于WiFi系统，在实际场景中，进行LBT的设备受到的干扰也可以来自于LTE LAA，NRU或是其它工作于unlicensed频段的通信系统，本申请对此不作限制。
不限于图4A-4B所示，NR U系统采用的LBT侦听机制还可以发生变化，不影响本申请的实施。
本申请中应用到的帧结构，可以是LTE或者其各演进版本的无线帧结构。例如，如图5所示，LTE规定的一种典型帧结构，在一个调度时隙(slot)中,包括14个OFDM符号(后文简称符号)，前1,2或者3个符号承载控制信息(DCI)，后11，12或者-13个符号承载数据。在新空口NR中，为了提高系统调度的灵活性，引入了微调度时隙(mini-slot)，其长度可以是2,4,或者7个OFDM符号。如图6所示的例子中，1个slot中包含3个4符号长的mini-slot和1个2符号长的mini-slot。当然，还可以是其他的mini-slot的组合。在每个mini-slot中，从第1个符号其前n个符号上承载本mini-slot的控制资源集(CORESET)，用于承载该mini-slot的调度信息(DCI)。具体的，n为自然数，小于mini-slot中的符号个数。较优的，n不超过3。
本申请中提到的GC-DCI和UE-specific DCI：两者的区别是GC-DCI是由GC-RNTI 加扰，与gNB关联的所有UE均可用该GC-RNTI进行解析；UE-specific DCI一般用每个UE自己的C-RNTI加扰，包含UE自己的下行调度信息，其它UE不需要也不会进行解析。
基于前述无线通信系统100、终端300以及网络设备400分别对应的实施例，本申请提供了一种信号传输方法，提供了网络侧LBT成功后发送初始信号以及UE侧进行初始信号检测的方法，以及相应的装置与系统。
实施方式一
参考图6，gNB在发送下行数据或者参考信号前需要进行LBT来获得信道接入权，即只能在LBT成功后才能进行传输。由于LBT可能在任何时刻成功，因此gNB可能在非slot的起始处开始下行传输。参考图6，数字0,1,2,…13是一个14符号slot中的各个符号的编号，gNB可以在一个slot内的符号0、1、3或者7处开始传输。当从符号1、3或者7开始传输时，第一个slot为非完整slot(该slot包含符号数小于14)，后续可能有1个或多个完整slot用于下行传输，COT内的最后一个slot也可能为非完整slot(图6中未示出后续的slot)。
一种方案中，PDCCH的DMRS或者group-common PDCCH的DMRS可用于下行传输检测，即UE可以通过检测上述DMRS来判断gNB是否已经通过LBT并开始下行传输(at least DMRS of any[PDCCH or GC-PDCCH]can be used by UE to detect transmission bursts by the serving gNB)。一般的，检测GC-PDCCH的DMRS相比于检测UE-specific PDCCH的DMRS更为有利，因为服务小区中的全部UE都需要获取初始信号(DMRS of GC-PDCCH is more preferred than DMRS of UE specific PDCCH because the initial signal is required by all UE within the serving cell.)但是，由于上述方案中，用于下行检测的DMRS在时频资源上较为稀疏，导致其检测性能较差。
在另一种方案中，group-common DMRS(GC-DMRS)和GC-PDCCH都被UE用于下行传输检测，以提高检测的可靠性(The group common PDCCH together with its DMRS sould be used by UE to identify the DL burst from serving cell.)。其中，上述Group-common PDCCH为组公共下行物理控制信道，用于承载GC-DCI，GC-DCI可以用于承载系统公共消息，如该COT剩余长度，或者，COT剩余时间内每个slot是上行还是下行，等等。
较优的实施方式中，gNB获得COT(即LBT成功)后，至少应该在COT的起始发送GC-DMRS和GC-PDCCH。另外，还可以在该COT中多次发送GC-DMRS和GC-PDCCH。其中，gNB在LBT成功后发送的一个或者多个GC-DMRS和GC-PDCCH组合可以被作为Initial signal，具体的，UE根据首次收到的GC-DMRS和GC-PDCCH判断下行传输(DL burst)的开始；该UE在该COT中收到的后续的GC-DMRS和GC-PDCCH不需要用于确定COT的开始，只需要根据最近接收到的GC-PDCCH其中携带的公共控制信息进行处理。各次发送的GC-PDCCH承载公共控制信息，例如GC-DCI，用于指示或者更新COT的结构，例如指示COT的剩余时间，指示剩余的一个或者多个slot中的上下行结构等等。
具体的，参考3GPP 38.213 section 10.1，UE在配置的CORESET中进行PDCCH盲检公式如下：
Figure PCTCN2020075571-appb-000003
其中L为聚合等级，可能取值为1,2,4,8,16。CORESET配置的符号数为1,2,或者3。对于GC-PDCCH，
Figure PCTCN2020075571-appb-000004
即其初始偏移值为0。i＝0,1,…,L。N CCE,p为该子带包含控制信道元素(CCE，Control channel element)的数目，如20MHz带宽，30kHz子载波间隔配置下共包含8个CCE。
Figure PCTCN2020075571-appb-000005
其中
Figure PCTCN2020075571-appb-000006
为gNB在载波n CI上给配置UE的在搜索空间S内聚合等级为L时进行PDCCH盲检的数目。对于GC-PDCCH，n CI＝0。
Figure PCTCN2020075571-appb-000007
为gNB在所有载波上给UE配置聚合等级为L时最大的PDCCH盲检数目。
在一个具体实施方式中，某小区中各个UE都需要根据初始信号(initial signal)检测下行传输的开始(COT的开始)。一般的，当UE漏检或者错检initial signal时，不能获取当前COT信息，因此需要按照partial slot中initial signal可能出现的位置持续盲检initial signal直到检测到为止。但是，上述UE的盲检方式过于复杂。
下述实施方式中针对initial signal，提供了更优的检测方法，可以降低UE盲检initial signal的复杂度。
本实施方式中，参考图7，在发送侧，101.gNB或者小区在LBT成功后或者COT的起始阶段，发送GC-DMRS和GC-PDCCH(GC-DCI承载在GC-PDCCH)。具体的，前述一起发送的GC-DMRS和GC-PDCCH，或者称为GC-DMRS和GC-PDCCH的组合，在时域上可以位于相同的一个或者多个符号(例如2或者3)，频域上可以位于相同的RB中的不同RE上。某个小区在LBT成功后首次一起发送的GC-DMRS和GC-PDCCH被接收到该GC-DMRS和GC-PDCCH的组合的UE作为下行传输的初始信号(initial signal)。
参考图7较优的，在该COT内可以多次发送GC-DMRS和GC-PDCCH的组合。具体的，所述多个GC-DMRS和GC-PDCCH的组合中的任意一个如果是某个UE接收到的首个GC-DMRS和GC-PDCCH的组合，则该UE接收到的首个GC-DMRS和GC-PDCCH的组合被作为下行传输的初始信号，即该UE根据自己接收到的首个GC-DMRS和GC-PDCCH的组合判断或者确定下行传输已经开始。图7中未示出全部的slot。
具体的，各次发送的各个发送的GC-DMRS和GC-PDCCH可以包含当前的COT剩余长度，后续一个或者多个slot的上下行指示和其它公共信息中的一种或者多种。
对比于前述公式1的检测公式，尤其针对本实施方式中的针对initial signal的检测(DL burst的检测)，可以有如下不同实施方式，即initial signal的搜索空间的配置符合前述公式1，且满足下述之一或者任意组合：
例1,根据小区大小和UE反馈，网络侧(例如gNB或者小区)为一个或者多个UE配置的初始信号(首次接收到的GC-DMRS和GC-PDCCH)的搜索空间中，初始信号中的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值。该取值可由标准直接给出，或者，由gNB通过PBCH，RMSI，OSI，RRC等广播信息/专有信令方式提前告知UE。表1所示的RRC为一个具体例子。具体的，该固定的值可以是4。另一个例子中，该固定的值可以是8。当然，也可以是1，2或者16。这里一个小区的initial signal里的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值，不会改变，和另一个小区的initial signal里的GC-PDCCH的聚合等级可以相同，也可以不相同。相 比较于普通GC-PDCCH的设置，普通GC-PDCCH的聚合等级可能根据传输的情况设置为不同的值或者发生变化。普通GC-PDCCH是指在COT中发送的与initial signal中GC-PDCCH配置可以不同的其他GC-PDCCH。
例2，网络侧(例如gNB或者小区)可以配置一个或者多个UE的初始信号(首次接收到的GC-DMRS和GC-PDCCH)的搜索空间中初始信号的盲检的次数或者以及需要检测的符号的位置。例如对于COT内的GC-PDCCH盲检，固定前述公式1中的
Figure PCTCN2020075571-appb-000008
该
Figure PCTCN2020075571-appb-000009
的取值可以为1或2。该取值可由标准直接给出，或者，由gNB通过PBCH，RMSI，OSI，RRC等广播信息/专有信令方式提前告知UE。
简而言之，NR-U中网络侧发送的GC-DMRS和GC-PDCCH的组合中的一个，可能被某个UE作为初始信号，具体的，某个UE首次收到的GC-DMRS和GC-PDCCH的组合会被用作初始信号。
具体的，在发送侧，网络侧的网元发送的GC-DMRS和GC-PDCCH的组合具有如下特点：
1、GC-DMRS和GC-PDCCH的组合不是周期出现的。
2、GC-DMRS和GC-PDCCH的组合与COT绑定。也就是说，每一个GC-DMRS和GC-PDCCH的组合对应一个COT。当然，如前文所述，发送的多个GC-DMRS和GC-PDCCH的组合可能对应同一个COT，各个GC-DMRS和GC-PDCCH分别承载该COT中更新的公共控制信息。
网络侧为一个或者多个UE配置的初始信号的搜索空间具有如下特点：
1、在COT内和COT外的GC-DMRS和GC-PDCCH的组合检测频率(密度)不同。例如，在COT内每个slot内的检测前X个符号，例如只检测第1个符号(符号0)；在COT结束后(COT外)，在每个slot中的配置的被检测符号位置集合上检测。配置的被检测符号位置集合，优选的可以是符号0、1、3或者7或者每两个符号进行GC-DMRS和GC-PDCCH的组合。参考图8a，8b，8c和8d中示出的COT内外的初始信号的检测的符号位置。当然，在其他实施方式中，可以根据配置，检测不同的符号。
2、作为Initial signal的GC-DMRS和GC-PDCCH的aggregation level是固定的，该aggregation level对应的盲检候选数目(number of candidates)设为1或2，即指每个被检测的符号上仅盲检1次或者2次。或者称为初始信号中的GC-PDCCH的最大的盲检的次数。其中，不被作为Initial signal的GC-PDCCH的aggregation level可以配置为其他值，且可以是不固定的。
具体的，现有技术中有GC-DMRS和\或者GC-PDCCH的search space配置信令,对于可以被UE作为初始信号的GC-DMRS和GC-PDCCH的搜索空间的配置信令(例如RRC)可以在现有的GC-DMRS和\或者GC-PDCCH的search space的配置信令中添加，也可以由gNB单独通知或者配置给UE。也就是说，网络侧可以发送针对一个或者多个UE的初始信号的搜索空间的配置信令(独立的或者与其他配置信令一起)。表1所示为前述RRC的具体例子。表1中的SearchSpaceId可以用于指示该配置信令是针对一个或者多个UE(例如小区中的一组UE)的初始信号的搜索空间。该表1所示的例子中，COT内的初始信号在每个被检测符号上盲检次数是1，盲检的位置是符号0；COT外的初始信号在每个被检测符号上盲检次数是1，盲检的位置是符号0、1、3、7。在其他的例子中，COT内的初始信号在每个被检测符号上盲检次数是1，盲检的位置是符号0，符号1或符号2，或是符号0, 1,2的任意组合。
Figure PCTCN2020075571-appb-000010
表1
具体的例子中，上述方法中，网络侧(gNB或者小区)根据初始信号的配置发送一个或者多个GC-DMRS和GC-PDCCH的组合。
如果从slot中的符号1、3或者7开始传输时，gNB采用mini-slot的方式在第一个partial slot进行下行数据传输。这种情况下可用下行资源较少，例如2符号的mini-slot只有2个符号可用于传输，且GC-DMRS和GC-PDCCH均需要占用上述资源。因此较优的， 在GC-PDCCH的search space中包括一个(或者多个UE的)的UE-specific PDCCH。具体的，该UE-specific PDCCH是fallback DCI，例如可以使用NR DCI 1_0格式，即，使用较少比特承载下行控制指示信息，节省控制信息开销，提高mini-slot的传输效率。
如果从slot中的符号0开始传输时，gNB采用完整slot的方式进行下行数据传输。一般来说，在配置的UE-specific搜索空间中发送一个或者多个UE的UE-specific PDCCH，该一个或者多个UE-specific PDCCH不需要采用NR DCI 1_0格式。
相应的，在接收侧，步骤201.UE检测接收到的信号，根据首次检测到的GC-DMRS和GC-PDCCH，作为初始信号，判断gNB已经开始进行下行传输。需要补充的是，UE首次检测到的GC-DMRS和GC-PDCCH的组合，可能是网络侧LBT成功后首次发的GC-DMRS和GC-PDCCH的组合，也可能是gNB在COT开始后发的某一个GC-DMRS和GC-PDCCH组合。
另外，因为GC-DMRS和\或者GC-PDCCH承载公共控制信息，所以对于已经检索到初始信号(首次接收到的GC-DMRS和GC-PDCCH的组合)的UE而言，除了根据初始信号的位置以及携带的控制信息进行下行信息的接收外，还可以在该COT内继续根据GC-DMRS和\或者GC-PDCCH的一般的搜索空间的配置继续进行检索并获取相关公共控制信息，以进行下行信息的接收。
在COT外(即没有检索到任何GC-DMRS和GC-PDCCH的组合时，即没有检索到初始信号)，将根据初始信号的搜索空间的设置继续进行初始信号(GC-DMRS和GC-PDCCH的组合)的检索。
具体的，参考图8a，8b，8c和8d中示出初始信号检测方法的简单示意图，上述方法中的201包括：
步骤201a.如果检测到GC-DMRS和GC-PDCCH(开始下行传输)的起始符号为符号0,(即第一个slot为完整slot,full slot)UE只需要在第0个或前X个(X由gNB进行配置)符号上继续进行UE-specific PDCCH的检测，其中，UE-specific PDCCH是一般的格式。有些情况下，根据UE的搜索空间设置，还会检测后续的GC-DMRS和GC-PDCCH。参考图8a，根据配置，可以不需要再在该slot内检测初始信号，可以在后续的一个或者多个完整slot中检测初始信号以获取更新的公共控制信息。
步骤201b.如果检测到GC-DMRS和GC-PDCCH(开始下行传输)的起始符号为符号0以后的其他符号时,(即第一个slot为非完整slot，partial slot)时，该UE还在该GC-PDCCH的搜索空间中用自己的C-RNTI来盲检UE-specific PDCCH。该UE-specific PDCCH承载fallback DCI，例如为NR DCI 1_0格式。参考图8b，图8c和图8d，根据配置，可以不需要再在该slot内的检测到初始信号后的符号位置上检测初始信号，但可以在后续的一个或者多个完整slot中检测初始信号以获取更新的公共控制信息。
步骤201b1.如果如果检测到GC-DMRS和GC-PDCCH并检测到自己的UE-specific PDCCH，则进一步解析该mini-slot中的下行数据。
步骤201b2.如果检测到GC-DMRS和GC-PDCCH，但没有检测到自己的UE-specific PDCCH，则在GC-PDCCH的其他搜索空间(例如下一个mini-slot或者slot的起始位置)或者UE-specific的搜索空间继续检测UE-specific PDCCH。
上述方案的一个具体例子包括：
UE1在第1个非完整slot内的符号1(第2个符号)检测到GC-PDCCH和GC-DMRS后，但没有发现GC-PDCCH的search space中有自己的PDCCH，则尝试在配置的的GC-PDCCH search space中(例如该非完整slot内的其它符号(例如符号3或符号7))继续检测是否有其C-RNTI加扰的fallback PDCCH或者在UE specific search space中检测是否有其C-RNTI加扰的PDCCH。
如果在该非完整slot内(例如符号3或符号7)没有检测到自己的UE-specific PDCCH，在第2个完整slot或之后的完整slot内，UE只需要在第0个或前X个(X由gNB进行配置，例如3)符号上检测GC-PDCCH和GC-DMRS(GC-PDCCH和GC-DMRS的搜索空间)，以及在检测到GC-PDCCH和GC-DMRS后进一步在UE-specific的搜索空间检测UE-specific PDCCH。
参考前述101.由于发送侧多次发送GC-PDCCH和\或者GC-DMRS，UE接收GC-PDCCH后可获取更新后的COT剩余长度以及后续slot的上下行指示和其它公共信息，接收UE-specific PDCCH后可以获取该slot内是否有gNB发给自己的下行数据。上述UE-specific PDCCH可以承载于GC-PDCCH搜索空间内，也可承载于gNB配置的UE-specific PDCCH搜索空间内。GC-PDCCH搜索空间或者UE-specific PDCCH搜索空间是gNB提前通过RRC，RMSI，或者OSI等信令配置或由标准直接给出。
实施方式二
由背景技术可知，gNB可以给UE配置BWP(bandwidth part,部分带宽)用于下行数据接收。该BWP可以包括一个或者多个子信道，其中子信道的带宽与NRU中进行LBT的带宽相同。例如子信道的带宽为20MHz，BWP可以是20MHz的整数倍，例如80MHz。
为了后文描述方便，先解释如下：后文中“子信道的信息”包括：通过LBT的子信道的COT剩余时间和\或各个slot的上下行配置等信息。
一个例子1中：
在发送侧，301.gNB在多个子信道上通过LBT，gNB可以在该多个子信道上(全部)分别发送GC-DMRS和GC-PDCCH。具体的，一个子信道上的GC-PDCCH只携带该一个子信道的信息，不携带其他子信道的信息。
相应的，在接收侧，401.UE需要在配置的BWP中的每个子信道分别盲检GC-DMRS和/或GC-PDCCH，以及UE-specific PDCCH。参考后文，较优的，可以按照为该UE配置的各个子信道的优先级顺序依次分别进行盲检，如果在高优先级的子信道上检测到GC-DMRS、GC-PDCCH以及UE-specific PDCCH，可以停止检测其他子信道。具体的，针对各个UE的子信道优先级顺序可以不同，也可以相同。
另一个例子2中：
在发送侧，501.gNB在多个子信道上通过LBT，gNB可以在该多个子信道中的一个发送GC-DMRS和GC-PDCCH。参考后文，所述一个可以是根据优先级等规则确定的，例如，该某一个子信道是通过LBT的优先级最高的子信道。其中，一个子信道上的GC-PDCCH可以包含多个子信道的信息，较优的，一个子信道上的GC-PDCCH包括该一个子信道的信息和其他子信道的信息。另外，例子2中，UE-specific PDCCH不支持跨子信道调度，也就是说，一个子信道上发送的UE-specific PDCCH仅调度或者指示该一个子信道上的时频资源，不能调度或者指示其它子信道上的时频资源以用于下行传输。
相应的，在接收侧，601，UE在配置的BWP中的某一个或者部分子信道检测到GC-DMRS和GC-PDCCH后，可以根据该GC-PDCCH获得通过了LBT的多个子信道的信息；然后，在通过LBT的各个子信道对应的GC-PDCCH搜索空间中分别盲检自己C-RNTI加扰的UE-specific PDCCH(例如mini-slot中的fallback PDCCH(可以使用NR DCI格式1_0)，或者，一般的UE-specific PDCCH)。较优的，参考后文，前述配置的BWP中的某一个或者部分子信道可以是按照优先级等规则确定的。前述“在通过LBT的各个子信道对应的GC-PDCCH搜索空间中分别盲检自己C-RNTI加扰的UE-specific PDCCH”可以是按照子信道的优先级的顺序依次进行盲检。
另一个例子3中：
701.gNB在多个子信道上通过LBT，gNB可以在该通过LBT的多个子信道中的一个子信道上发送GC-DMRS和GC-PDCCH。其中，一个子信道上的GC-PDCCH可以包含多个子信道的信息，且UE-specific PDCCH支持跨子信道调度。跨子信道调度是指一个子信道上发送的UE-specific PDCCH可以调度或者指示所述一个子信道以及其它子信道上的时频资源用于下行传输。本例子中，gNB只在通过LBT的某一个子信道上传输GC-DMRS和/或GC-PDCCH以及UE-specific PDCCH(如果有)。较优的，类似例2，所述一个或者部分子信道可以是根据优先级等规则确定的，例如，该某一个子信道是通过LBT的优先级最高的子信道；该“部分子信道”是通过LBT的优先级最高到次高的多个子信道。gNB在其它子信道上可以只传输GC-DMRS但不传输GC-PDCCH，或者，gNB在其它子信道上可以既不传输GC-DMRS也不传输GC-PDCCH。
相应的，在接收侧，801，UE在配置的BWP中的某一个子信道检测到GC-DMRS和GC-PDCCH后，可以根据该GC-PDCCH获得通过了LBT的多个子信道的信息：例如，BWP内所有通过LBT的子信道中的每个子信道的COT信息，COT内多个子信道上的上下行配置等公共信息，还可以获得每个子信道上对应的下行数据调度信息。该UE在该一个子信道的GC-PDCCH搜索空间继续盲检自己C-RNTI加扰的UE-specific PDCCH(其承载mini-slot中的fallback DCI(可以使用NR DCI格式1_0)，或者，一般的UE-specific PDCCH)。
如前述各个例子提及的，gNB可以在遵循一定规则的一个或者多个子信道发送上述GC-PDCCH、UE-specific PDCCH或GC-DMRS的任意组合，相应的，UE在遵循一定规则的一个或者多个子信道进行盲检，可以减少UE盲检上述PDCCH的开销。例如该规则是指子信道的优先级顺序。较优的，前述例2或者例3中，gNB仅在符合某规则的一个子信道上发送GC-PDCCH、UE-specific PDCCH或GC-DMRS的任意组合；相应的，UE仅在符合该规则的一个子信道上进行盲检，从而进一步的减少UE盲检PDCCH的开销。
前述规则，可以是某一个或者多个特定的子信道对应一个优先级，或者，每个子信道分别对应一个优先级。前述优先级可以是固定的或随着时间而发生变化，上述优先级信息可以由gNB提前配置。
例如，一个UE配置的BWP中包含4个子信道：子信道0,1,2,3，4个子信道发送PDCCH的优先级为{子信道1,3,2,0}。gNB只在一个通过LBT的子信道上发送GC-DMRS和GC-PDCCH时，则UE会按照子信道1,3,2,0的顺序上依次检测GC-DMRS和GC-PDCCH；即在子信道1上没有检测到GC-DMRS和GC-PDCCH时，再在子信道3上进行检测；在子信道3上没有检测到GC-DMRS和GC-PDCCH时，再在子信道2上进行检测；在子信道2上没有检测到GC-DMRS和GC-PDCCH时，再在子信道0上进行检测。
前述实施方式可以进行符合技术逻辑的分拆或者组合：
例如，gNB在所有通过LBT的子信道上发送GC-DMRS，并仅在通过LBT的子信道中的某一个子信道(例如通过LBT的子信道中的最高优先级)上发送GC-PDCCH。对应的，UE先在BWP内所有子信道上检测GC-DMRS，然后在检测到GC-DMRS的子信道中的最高优先级的子信道上检测GC-PDCCH。例如，UE通过GC-DMRS得知子信道2,3通过LBT，根据各个子信道优先级{子信道1,3,2,0}可知，gNB仅在子信道3上发送PDCCH。相应的，UE只会在子信道3上盲检GC-PDCCH以及UE-specific PDCCH，这样进一步降低了盲检开销。
又例如，对于前述UE-specific PDCCH支持跨载波调度的例3，UE解析UE-specific PDCCH的方式可以和GC-PDCCH相同。对于前述UE-specific PDCCH不支持跨载波调度的例2，UE在解析GC-PDCCH后获得BWP内子信道LBT信息，再通过LBT的各个子信道上依次检测可能的UE-specific PDCCH(例如按照优先级的顺序依次)。
前述各个例子中的UE在某个子信道上的具体的盲检过程可以参考实施方式一的方案，也可以是实施方式一的合理变形或者组合，当然，也可能是其他的可能的检测方案， 此处不赘述。
另外，本发明实施例还提供了一种无线通信系统，所述无线通信系统可以是图1所示的无线通信系统100，也可以是图9所示的无线通信系统10，可包括：网络设备和终端。其中，所述终端可以是前述实施例中的终端，所述网络设备可以是前述实施例中的网络设备。具体的，所述终端可以是图2所示的终端300，所述网络设备可以是图3所示的网络设备400。所述终端也可以是图9所示的终端400，所示网络设备也可以是图9所示的网络设备500。关于所述网络和所述终端的具体实现可参考前述实施例，这里不再赘述。
以图2所示网络设备为例，网络设备处理器405用于控制发射器407在非授权频段和/或授权频段进行发送以及控制接收器409在非授权频段和/或授权频段进行接收。发射器407用于支持网络设备执行对数据和/或信令进行发射的过程。接收器409用于支持网络设备执行对数据和/或信令进行接收的过程。存储器405用于存储网络设备的程序代码和数据。
具体的，网络设备的发射器407可用于执行上述101，301,501或者701等初始信号和其他信号的发送的方法。其他功能与工作流程参考前述各实施方式，此处不再赘述。
关于网络设备中各部件的具体实现，可参考图前述方法实施例，这里不再赘述。
以图2所示终端为例，终端处理器304用于调用存储于所述存储器312中的指令来控制发射器306在非授权频段和/或授权频段进行发送以及控制接收器308在非授权频段和/或授权频段进行接收。发射器306用于支持终端执行对数据和/或信令进行发射的过程。接收器308用于支持终端执行对数据和/或信令进行接收的过程。存储器312用于存储终端的程序代码和数据。
具体的，接收器308可用于201，401,601或者801等的方法。其他功能与工作流程参考前述各实施方式，此处不再赘述。
具体的，发射器306可用于在监听到的空闲的频域资源上发送上行数据。
关于终端中各部件的具体实现，可参考图前述方法实施例，这里不再赘述。
本领域技术人员可以理解，可以对实施方式中的各个功能模块进行不同的划分，不影响产品其实现。例如，发送侧的装置可以划分出LBT模块，用于实现图4A和\或4B的LBT功能，可以划分初始信号发送模块，。而在产品中，上述模块很可能是集成在软硬件中，例如处理器或者集成电路。
结合本发明实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM、闪存、ROM、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其他形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于收发机或中继设备中。当然，处理器和存储介质也可以作为分立组件存在于无线接入网设备或终端设备中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明实施例所描述 的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上的具体实施方式，对本发明实施例的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上仅为本发明实施例的具体实施方式而已，并不用于限定本发明实施例的保护范围，凡在本发明实施例的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明实施例的保护范围之内。

Claims (17)

  1. 一种初始信号检测方法，其特征在于，包括：
    UE在非授权频谱的一个或者多个子信道上进行检测；
    根据首次检测到的GC-DMRS和GC-PDCCH的组合，确定下行传输已经开始或者确定COT已经开始。
  2. 根据权利要求1所述的方法，所述UE的初始信号的搜索空间(search space)的配置符合下述之一或者任意组合：
    初始信号中的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值；或者，
    初始信号中的GC-PDCCH的最大的盲检的次数为每个slot中1或2次。
  3. 根据权利要求2所述的方法，接收所述UE的初始信号的搜索空间(search space)的配置信息，所述配置信息中的配置为权利要求2所述的配置。
  4. 根据权利要求1所述的方法，其中，所述UE所述首次检测到的GC-DMRS和GC-PDCCH的组合位于一个slot中的符号1、3或者7，所述方法还包括：
    所述UE在GC-PDCCH的搜索空间(search space)中继续检索自己的第一UE-specific PDCCH。
  5. 根据权利要求2的方法，其中所述第一UE-specific PDCCH使用NR DCI 1_0格式。
  6. 根据权利要求1所述的方法，其中，所述UE所述首次检测到的GC-DMRS和GC-PDCCH的组合位于一个slot中的符号0，其中，所述方法还包括：
    在GC-PDCCH的search space以外，所述UE在UE-specific PDCCH的搜索空间中搜索自己的UE-specific PDCCH。
  7. 一种初始信号传输方法，其特征在于，包括：
    网络侧在非授权频谱的一个或者多个子信道上进行LBT；
    所述网络侧在LBT成功的一个或者多个子信道上发送一个或者多个GC-DMRS和GC-PDCCH的组合，其中，所述一个或者多个GC-DMRS和GC-PDCCH的组合中的一个被作为下行传输的初始信号。
  8. 根据权利要求1所述的方法，
    一个或者多个UE的初始信号的搜索空间(search space)的配置符合下述之一或者任意组合：
    初始信号中的GC-PDCCH的聚合等级(aggregation level)被设置为一个固定的值；或者，
    初始信号中的GC-PDCCH的最大的盲检的次数为每个被检测的符号1或2次。
  9. 根据权利要求7所述的方法，
    网络侧发送所述一个或者多个UE的初始信号的搜索空间(search space)的配置信息，所述配置信息中的配置为权利要求8所述的配置。
  10. 根据权利要求1所述的方法，其中，
    所述发送的第一个所述GC-DMRS和GC-PDCCH的组合位于COT的起始位置。
  11. 根据权利要求1所述的方法，其中，
    所述发送的一个或者多个所述GC-DMRS和GC-PDCCH的组合中的一个位于一个slot中的符号1、3或者7，其中，所述GC-PDCCH的search space中包括一个或者UE的第一UE-specific PDCCH。
  12. 根据权利要求11所述的方法，其中所述第一UE-specific PDCCH使用NR DCI 1_0格式。
  13. 根据权利要求1所述的方法，其中，所述一个或者多个所述GC-DMRS和GC-PDCCH的组合中的一个位于一个slot中的符号0，其中，在所述GC-PDCCH的search space以外，在UE-specific PDCCH的搜索空间中包含一个或者多个UE-specific PDCCH。
  14. 一种初始信号检测装置，用于执行如权利要求1-6中任意一个所述的方法。
  15. 一种初始信号发送装置，用于执行如权利要求7-13中任意一个所述的方法。
  16. 一种计算机可读存储介质，存储了用于执行如权利要求1-13中任意一个所述的方法。
  17. 一种无线通信中的帧结构，所述帧结构符合如权利要求1-13中任意一个的帧结构。
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