WO2020150957A1 - Procédé de communication sans fil pour spectre sans licence, et dispositif - Google Patents

Procédé de communication sans fil pour spectre sans licence, et dispositif Download PDF

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Publication number
WO2020150957A1
WO2020150957A1 PCT/CN2019/072951 CN2019072951W WO2020150957A1 WO 2020150957 A1 WO2020150957 A1 WO 2020150957A1 CN 2019072951 W CN2019072951 W CN 2019072951W WO 2020150957 A1 WO2020150957 A1 WO 2020150957A1
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WIPO (PCT)
Prior art keywords
resource set
symbol
time domain
pdcch
start position
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PCT/CN2019/072951
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English (en)
Chinese (zh)
Inventor
贺传峰
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN201980018535.2A priority Critical patent/CN111869292B/zh
Priority to PCT/CN2019/072951 priority patent/WO2020150957A1/fr
Publication of WO2020150957A1 publication Critical patent/WO2020150957A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular to a wireless communication method and device for unlicensed spectrum.
  • Unlicensed spectrum is a spectrum that can be used for radio equipment communications divided by countries and regions. This spectrum is usually considered to be a shared spectrum, that is, communication equipment in different communication systems meets the regulatory requirements set by the country or region on the spectrum, and can use the spectrum. For spectrum, there is no need to apply for a proprietary spectrum authorization from the government.
  • the embodiments of the present application provide a wireless communication method and device for unlicensed spectrum, which can implement PDCCH transmission on unlicensed spectrum.
  • a wireless communication method for unlicensed spectrum including: a network device performs channel detection based on a first resource set that is candidate for sending a physical downlink control channel PDCCH; When idle, the first PDCCH is sent on the second resource set; wherein the time domain start position of the second resource set is determined based on the start time of successful channel detection, or the time of the second resource set The domain start position is the time domain start position of the first resource set.
  • a wireless communication method for unlicensed spectrum including: a terminal device detects a first physical downlink control channel PDCCH on a second resource set; wherein the time domain of the second resource set starts The position is later than the time domain start position of the first resource set candidate for sending the PDCCH, or the time domain start position of the second resource set is the time domain start position of the first resource set.
  • a network device for executing the method in the above-mentioned first aspect.
  • the network device includes a functional module for executing the method in the above first aspect.
  • a terminal device for executing the method in the second aspect.
  • the terminal device includes a functional module for executing the method in the above second aspect.
  • a network device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method in the above first aspect.
  • a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method in the above second aspect.
  • a chip is provided for implementing the method in the first aspect.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the method in the above-mentioned first aspect.
  • a chip is provided for implementing the method in the second aspect.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the method in the above second aspect.
  • a computer-readable storage medium for storing a computer program that enables a computer to execute the method in the first aspect.
  • a computer-readable storage medium for storing a computer program that enables a computer to execute the method in the second aspect.
  • a computer program product including computer program instructions that cause a computer to execute the method in the first aspect.
  • a computer program product including computer program instructions, which cause a computer to execute the method in the second aspect.
  • a computer program which, when run on a computer, causes the computer to execute the method in the first aspect.
  • a computer program which, when run on a computer, causes the computer to execute the method in the first aspect.
  • the network device performs channel detection based on the first resource set candidate for sending the physical downlink control channel PDCCH; when the network device detects that the channel is idle, the network device performs channel detection on the second resource set Send the first PDCCH; wherein the time domain start position of the second resource set is determined based on the start time of successful channel detection, or the time domain start position of the second resource set is the first resource set Or, the second resource set is the first resource set indicated by the network device. Therefore, the embodiment of the present application can implement the transmission of the PDCCH on the unlicensed spectrum.
  • Fig. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application.
  • Fig. 2 is a schematic diagram of an SSB provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a distribution pattern of SSB provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an SSB candidate sending position provided by an embodiment of the present application.
  • Fig. 5 is a schematic diagram of a DRS pattern provided by an embodiment of the present application.
  • Fig. 6 is a schematic diagram of another DRS pattern provided by an embodiment of the present application.
  • Fig. 7 is a schematic diagram of another DRS pattern provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a wireless communication method for unlicensed spectrum according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a time domain position for sending a PDCCH according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of another time domain position for sending a PDCCH according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of another time domain position for sending a PDCCH according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a network device according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a communication device according to an embodiment of the present application.
  • FIG. 15 is a schematic diagram of a chip according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System of Mobile Communication
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • LTE-A Advanced long term evolution
  • NR New Radio
  • NR NR system evolution system
  • LTE on unlicensed frequency bands LTE-based access to unlicensed spectrum, LTE-U
  • NR NR-based access to unlicensed spectrum, NR-U
  • UMTS Universal Mobile Telecommunication System
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • WiMAX Wireless Local Area Networks
  • WLAN Wireless Fidelity
  • WiFi next-generation communication systems or other communication systems, etc.
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the communication system 100 applied in the embodiment of the present application is shown in FIG. 1.
  • the communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or a terminal).
  • the network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area.
  • the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network side devices in 5G networks, or network devices in the future evolution of Public Land Mobile Network (PLMN), etc.
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • LTE Long Term Evolutional Node B
  • eNB evolved base station
  • CRAN Cloud Radio Access Network
  • the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridge
  • the communication system 100 further includes at least one terminal device 120 located within the coverage area of the network device 110.
  • the "terminal equipment” used here includes but is not limited to connection via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection ; And/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM- FM broadcast transmitter; and/or another terminal device set to receive/send communication signals; and/or Internet of Things (IoT) equipment.
  • PSTN Public Switched Telephone Networks
  • DSL Digital Subscriber Line
  • WLAN wireless local area networks
  • IoT Internet of Things
  • a terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a “wireless terminal” or a “mobile terminal”.
  • mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device.
  • PCS Personal Communications System
  • GPS Global Positioning System
  • Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device.
  • the access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.
  • the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.
  • NR New Radio
  • Figure 1 exemplarily shows one network device and two terminal devices.
  • the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The embodiment does not limit this.
  • the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices.
  • the communication device may include a network device 110 having a communication function and a terminal device 120.
  • the network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here.
  • the communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiment of the present application.
  • the method of the embodiment of the present application can be applied to communication of unlicensed spectrum.
  • Unlicensed spectrum is the spectrum that can be used for radio equipment communication divided by the country and region. This spectrum can be considered as a shared spectrum, that is, communication devices in different communication systems can meet the regulatory requirements set by the country or region on the spectrum. To use this spectrum, it is not necessary to apply for a proprietary spectrum authorization from the government.
  • LBT Listen Before Talk
  • communication devices can follow the principle of Listen Before Talk (LBT) when communicating on unlicensed spectrum, that is, Before the communication device transmits signals on the channels of the unlicensed spectrum, it needs to perform channel listening (or called channel detection) first.
  • LBT Listen Before Talk
  • the communication device can transmit signals; if the communication device is in The result of channel sensing on the unlicensed spectrum is that the channel is busy, and signal transmission cannot be performed.
  • the bandwidth of the LBT is 20 MHz, or an integer multiple of 20 MHz.
  • the maximum channel occupation time can refer to the maximum length of time allowed to use unlicensed spectrum channels for signal transmission after successful LBT. There are different MCOTs under different channel access schemes. The maximum value of MCOT may be 10 ms, for example. It should be understood that the MCOT is the time occupied by signal transmission.
  • Channel Occupancy Time may refer to the length of time for signal transmission using a channel of an unlicensed spectrum after the LBT is successful, and the signal occupation of the channel may be discontinuous within this time length.
  • one COT may optionally not exceed, for example, 20 ms at the longest, and the length of time occupied by signal transmission in the COT does not exceed MCOT.
  • Common channels and signals (such as synchronization signals and broadcast channels) in the NR system can cover the entire cell by means of multi-beam scanning, which is convenient for UEs in the cell to receive.
  • the multi-beam transmission of synchronization signal (SS, synchronization signal) and physical broadcast channel (Physical Broadcasting Channel, PBCH) can be realized by defining SS/PBCH burst sets.
  • an SS/PBCH burst set may include one or more synchronization signal blocks (SS/PBCH block, SSB).
  • SS/PBCH block SSB
  • One SSB is used to carry the synchronization signal and broadcast channel of one beam. Therefore, the number of SSBs that can be included in an SS burst set can be equal to the SSB beams sent by the cell.
  • the maximum number L of SSBs included in an SS burst set may be related to the frequency band of the system.
  • L is equal to 4; for a frequency band between 3 GHz and 6 GHz, L is equal to 8; for a frequency band between 6 GHz and 52.6, L is equal to 64.
  • one SSB can contain one symbol of primary synchronization signal (Primary synchronization signal, PSS), one symbol (Secondary synchronization signal, SSS), and two symbol NR-PBCH (New Radio Access Technology-Physical broadcast channel) , Physical broadcast channel), for example, as shown in Figure 2.
  • PSS Primary synchronization signal
  • SSS Secondary synchronization signal
  • NR-PBCH New Radio Access Technology-Physical broadcast channel
  • the time-frequency resources occupied by the PBCH may optionally include a demodulation reference signal (Demodulation Reference Signal, DMRS), which is used for demodulation of the PBCH.
  • DMRS Demodulation Reference Signal
  • all SSBs in the SS/PBCH burst set can be sent within a certain time window (for example, 5ms), and sent repeatedly in a certain cycle, which can be performed by the high-level parameter SSB-timing (SSB-timing) Configuration, for example, the period may include 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, etc.
  • a certain time window for example, 5ms
  • SSB-timing SSB-timing
  • SCS subcarrier space
  • L is the largest number of SSBs, and the actual number of SSBs sent can be less than L.
  • the position of the actually sent SSB is notified to the terminal device through system information in the form of bit mapping.
  • a network device can send a Discovery Reference Signal (DRS) signal for access, measurement, etc., and the DRS can include at least SSB. Since the signal sent on the unlicensed spectrum may fail to send successfully due to LBT failure, for the DRS transmission, it is hoped that after the network device obtains the channel, it is possible to send system information such as SIB1 at the same time as possible.
  • DRS Discovery Reference Signal
  • DRS may include SSB, PDCCH corresponding to SIB1, a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) carrying SIB1, and may also include a paging cell. Similar to SSB, DRS signals can also be sent according to a block, and the signals in the block have a (Quasi Co-Loacted, QCL) relationship. It should be understood that in the embodiments of the present application, the DRS may also include other types of information, which is not specifically limited in the embodiments of the present application.
  • the DRS may not be successfully transmitted at a predetermined time.
  • the chance of sending the DRS can be increased.
  • the number Y of candidate locations of the DRS configured by the network device is greater than the number X of the DRS actually sent by the network device. That is, for each DRS transmission window, the network device may determine to use X available candidate positions among the Y candidate positions to transmit the DRS according to the detection result of the LBT in the DRS transmission window.
  • the LBT performed before the transmission time of SSB index 0 fails, channel listening continues, and the LBT performed before SSB index 4 succeeds, the remaining SSB is sent from SSB index 4, and After the SSB index 7 is sent, the SSB index 0-3 that was not sent successfully before is sent.
  • the actual transmission time of the SSB may be at the initial or alternative transmission time. As shown in Figure 4, it is just a method to increase the sending opportunity, and there are other methods, which will not be repeated here.
  • the DRS may include a PDCCH for SIB1 (or PDCCH for other purposes), and the symbol occupied by the PDCCH for SIB1 may be before the symbol occupied by the SSB, for example, it may occupy 2 symbols , And the two symbols are continuous with the symbols occupied by the SSB; the DRS may further include a PDSCH for SIB1, the symbols occupied by the PDSCH may be the same as the symbols occupied by the SSB, and the SSB and the PDSCH may be frequency division multiplexed .
  • the structure of each DRS in one transmission window may be the same, or the structure of the DRS in the same time slot may be the same.
  • the symbols occupied by the DRS in the same time slot can be continuous or discontinuous.
  • the DRS pattern can be as shown in Figure 5.
  • the DRS may include the PDCCH for SIB1 (or PDCCH for other purposes), and the symbols occupied by the PDCCH for SIB1 may be located after the symbols occupied by the SSB, for example, two Symbols, and the 2 symbols are continuous with the symbols occupied by the SSB; the DRS may further include a PDSCH for SIB1, the symbols occupied by the PDSCH may be the same as the symbols occupied by the SSB, and the SSB and the PDSCH may be frequency division multiplexed of.
  • the structure of each DRS in one transmission window may be the same, or the structure of the DRS in the same time slot may be the same.
  • the symbols occupied by the DRS in the same time slot may be continuous or discontinuous.
  • the DRS pattern can be as shown in Figure 6.
  • the DRS may include a PDCCH for SIB1 (or PDCCH for other purposes), and the symbol occupied by the PDCCH for SIB1 may be located after or before the symbol occupied by the SSB.
  • symbols occupied by PDCCHs included in some DRSs may be located before symbols occupied by SSBs, and symbols occupied by PDCCHs included in other DRSs may be located behind symbols occupied by SSBs.
  • the symbol occupied by the PDCCH included in one DRS is located before the symbol occupied by the SSB, and the other DRS (for example, the second DRS)
  • the symbols occupied by the included PDCCH are located after the symbols occupied by the SSB.
  • the DRS may further include a PDSCH for SIB1, the symbols occupied by the PDSCH may be the same as those occupied by the SSB, and the SSB and the PDSCH may be frequency division multiplexed.
  • the structure of each DRS in one transmission window may be the same, or the structure of the DRS in the same time slot may be the same.
  • the symbols occupied by different DRSs in the same time slot may be continuous or discontinuous, for example, two symbols may be separated.
  • the pattern of the DRS can be as shown in Figure 7.
  • the wireless communication method 200 for unlicensed spectrum will be described below in conjunction with FIG. 8.
  • the method 200 includes at least part of the following content.
  • the network device performs channel detection based on the first set of resources that are candidates for sending the PDCCH.
  • the time window can appear periodically.
  • the candidate resource set for sending the PDCCH may be configured on the network side, or preset on the terminal device based on the protocol.
  • the resource set in the embodiment of the present application may include time domain resources, and may further include frequency domain resources and/or code domain resources.
  • the resource set mentioned in the embodiment of the present application may be a control resource set (Control Resource Set, CORESET), and specifically may be a CORESET with a fixed time domain location.
  • CORESET Control Resource Set
  • the PDCCH mentioned in the embodiment of this application may belong to the DRS, such as the PDCCH used for System Information Block (SIB) 1.
  • SIB System Information Block
  • the candidate resource set for the PDCCH in the embodiment of this application may be based on The time domain position of SSB is fixed and the time domain position is CORESET.
  • the PDCCH mentioned in the embodiment of the present application may also exist independently of the DRS.
  • the resource set in the embodiment of the present application may be a search space.
  • the first resource set is composed of at least one third symbol, and the at least one third symbol is the first at least one symbol among the symbols that are candidate for sending the DRS.
  • the channel detection mentioned in the embodiment of the present application may be to perform an LBT operation, which may be specifically used to detect whether the current channel is idle.
  • the network device sends the first PDCCH on the second resource set when the channel is detected to be idle; wherein, the time domain start position of the second resource set is based on the start time of successful channel detection Determine, or, the time domain start position of the second resource set is the time domain start position of the first resource set, or the second resource set is the first resource indicated by the network device set.
  • the network device before the network device uses the first resource set to send the PDCCH, if the network device does not obtain the channel occupation, it needs to detect the channel to determine whether the channel is idle. If it is idle, it can be based on channel detection. As a result, and/or the first resource set transmits the PDCCH.
  • the terminal device detects the first PDCCH on the second resource set; wherein, the time domain start position of the second resource set is later than the time domain start position of the first resource set, or the The time domain start position of the second resource set is the time domain start position of the first resource set, or the second resource set is the first resource set indicated by the network device.
  • the time domain start position of the second resource set is later than the time domain start position of the first resource set
  • the terminal device also detects the first resource set on the first resource set. PDCCH.
  • the terminal device if the terminal device is not sure whether the resource set where the first PDCCH is located is the first resource set or the second resource set different from the first resource set, it may be in the first resource set and the second resource set.
  • the first PDCCH is blindly detected on the resource set. If the second resource set has multiple possible situations, blind detection is performed on the second resource set under the multiple possible situations.
  • the terminal device can determine that the resource set where the first PDCCH is located is one of the first resource set and the second resource set different from the first resource set, the first PDCCH can be blindly detected on one of the resource sets.
  • the terminal device may perform blind detection only on the first resource set.
  • channel detection may be performed based on each resource set in turn, and channel detection based on the current resource set is not detected When the channel is idle, the channel detection can be performed based on the next resource set.
  • the purpose of channel detection based on the candidate resource set used for transmitting the PDCCH is to use the resources included in the resource set to transmit the PDCCH.
  • the network device may start channel detection a period of time before the resource collection.
  • the first resource set and the second resource set at least partially overlap in the time domain.
  • the second resource set is a subset of the second resource set in the time domain, or the second resource set has an intersection with the second resource set in the time domain.
  • the second resource set is the first resource set indicated by the network device.
  • the network device may send first indication information to the terminal device, where the first indication information indicates a first resource set, and the second resource set may be the first resource set indicated by the network device.
  • the first indication information may belong to or not belong to DRS.
  • the first indication information may be PDCCH-SIB1 configuration (pdcch-ConfigSIB1) information, and the first indication information may be carried in the PBCH.
  • the network device indicates the first resource set, it needs to use the first resource set to send the PDCCH. If channel detection is performed for the first resource set, no channel idle is detected (not all symbols in the first resource set are available). ), the channel detection can be performed based on the next candidate resource set for sending the PDCCH.
  • the first resource set may be determined as the second resource set based on the first indication information sent by the network device, which is used to obtain the PDCCH.
  • the time domain start position of the first resource set may be the time domain start position of the DRS.
  • the first indication information can also be understood as indicating the time domain start position of the DRS.
  • CORESET can be obtained through the pdcch-ConfigSIB1 carried in the PBCH. From the perspective of the base station, it can be specified that the allowed starting position of the DRS sent by the base station is consistent with that indicated by pdcch-ConfigSIB1.
  • This method implicitly indicates the behavior of the base station through the pdcch-ConfigSIB1 information, for example, indicates whether the starting position of sending the DRS is the first symbol or the second symbol of the SRS shown in FIG. 9.
  • the CORESET indicated by the pdcch-ConfigSIB1 carried in the PBCH starts from the second symbol in the DRS.
  • the first resource set can be understood as a resource set including one symbol.
  • the base station can implicitly indicate the start symbol allowed by the DRS to be sent through pdcch-ConfigSIB1, so that the base station and the UE have the same understanding of the actual CORESET, ensuring that the UE receives the PDCCH correctly, and is compatible with multiple terminals.
  • the first indication information mentioned in the embodiment of the present application may indicate the first resource set by indicating the time domain start position, the time domain end position and/or the length of the first resource set.
  • the time domain start position of the second resource set is the time domain start position of the first resource set.
  • a candidate resource set for sending the PDCCH may be preset on the terminal device, and the time domain start position of the second resource set for sending the PDCCH may be the time domain start position of the candidate resource set.
  • the base station only allows the first symbol of the two symbols included in CORESET to start transmitting DRS, then there is no problem of inconsistent understanding of CORESET between the base station and UE. That is, the CORESET sent and received by the PDCCH are inconsistent.
  • the start symbol of the DRS is predefined and only allowed to start from the first symbol.
  • the CORESET sent and received by the PDCCH for SIB1 can always be kept consistent through predefined rules. This method is simple and effective, and has little impact on the standard.
  • the network device may also send the first indication information to the terminal device, and the first indication information may indicate the first resource set.
  • the time domain start position of the second resource set is determined based on the start time of successful channel detection.
  • the second resource set may be determined according to the starting time when the channel detection is successful (or the starting time when the channel is idle).
  • the time domain start position of the second resource set may be equal to the time domain start position of the first resource set.
  • the first resource set can be equal to the second resource set
  • the time domain start position of the second resource set may be the symbol after the first symbol.
  • the second resource set may be a subset of the first resource set in the time domain, or the first resource set and the second resource set may partially overlap in the time domain.
  • the base station instructs the UE according to the CORESET of two symbols, and the start symbol of the DRS sent by the base station may be different depending on the result of the LBT, that is, the DRS can be sent at the first or second symbol.
  • the UE can detect the PDCCH according to these two possibilities and according to two possible CORESETs, that is, the CORESET containing one symbol or two symbols to detect the PDCCH.
  • the actual DRS starting position is at the beginning of the second symbol.
  • the UE can perform blind detection according to two kinds of CORESET, that is, CORESET includes the first and second symbols, and CORESET includes the second symbol.
  • the base station since the base station is allowed to temporarily change the number of symbols contained in CORESET according to the result of LBT, that is, the base station is allowed to start DRS transmission from the first or second symbol, the probability of successful DRS transmission can be increased. Conversely, if the base station is only allowed to start DRS transmission at the first symbol, if the channel detection fails at that time, the channel is free at the beginning of the second symbol in time, and DRS is not allowed to be sent, which reduces the probability of successful DRS transmission.
  • the second resource set may not have any overlap with the first resource set.
  • the network device may send the first indication information to the terminal device, and the first indication information may indicate the first resource set, or the first resource set may be preset on the terminal device.
  • the start position in the time domain of the second resource set may be different from the time domain of the first resource set
  • the start position of the second resource set in the time domain may be later than the start position of the first resource set in the time domain.
  • the terminal device may obtain the PDCCH according to the blind detection result instead of obtaining the PDCCH according to the first indication information.
  • the first PDCCH may be a part of the DRS.
  • the second resource set includes at least one first symbol, and the at least one first symbol is the first at least one symbol among the symbols occupied by the DRS.
  • the second resource set includes at least one second symbol, and the at least one second symbol is the last at least one symbol among the symbols occupied by the DRS.
  • the second resource set may include at least one first symbol and at least one second symbol at the same time.
  • the network device performs channel detection based on the first resource set before the SSB, if only part of the symbols in the first resource set can be used to transmit the first PDCCH, it can be After the partial symbols in the first resource set are used as the symbols of the second resource set, at least one symbol after the SSB may also be used as the symbols of the second resource set.
  • the base station may instruct to start DRS transmission from the first symbol of CORESET, but actually allows the base station to start DRS from the second symbol according to the result of LBT.
  • the DRS transmission starts from the second symbol, at least one of the two symbols after the SSB is allowed to be used as CORESET for PDCCH detection.
  • the UE needs to blindly detect the PDCCH according to the multiple possibilities of the CORESET of the PDCCH sent by these base stations.
  • the base station instructs the UE according to the CORESET of two symbols, and the start symbol of the DRS sent by the base station may be different depending on the result of LBT, that is, the DRS can be sent at the first or second symbol of the CORESET.
  • the UE can detect the PDCCH according to a variety of possible CORESETs, which can specifically include: two symbols before SSB, or, the first symbol before SSB, or, the first symbol before SSB and any one after SSB Symbol, or, the first symbol before SSB and the two symbols after SSB.
  • the base station flexibly adjusts the symbol where the CORESET is located according to the result of the LBT, which not only improves the probability of successful DRS transmission, but also ensures that the PDCCH for SIB1 has sufficient resources for transmission.
  • the network device sends instruction information that indicates which symbol in the first resource set is used as the starting symbol position of the second resource set. For example, if the first resource set includes 2 symbols, it may indicate that the second symbol is The starting symbol position of the second resource set.
  • the terminal device can obtain the PDCCH from the indicated symbol position according to the indication information.
  • the symbol indicated by the indication information may be determined by the network device based on the channel detection result, or determined by the network device based on the amount of information included in the PDCCH to be sent.
  • the network device may also send the second PDCCH on the third resource set candidate for sending the PDCCH; where The third resource set is located after the first resource set in the time domain, and the time domain start position for sending the second PDCCH on the third resource set is the time domain start position of the third resource set ,
  • the first resource set and the third resource set belong to the same COT.
  • the second PDCCH can be acquired from the third resource set that is candidate for sending the PDCCH.
  • the PDCCH can be sent multiple times within the same COT.
  • the channel detection needs to be performed when the PDCCH is sent for the first time, and it is not necessary to perform channel detection when the PDCCH is sent subsequently.
  • the PDCCH can be sent by using the candidate resource set for sending the PDCCH, and the time domain starting position of the PDCCH sending is the time domain starting position of the candidate resource set for sending the PDCCH.
  • the start position of the time domain for sending the PDCCH for the first time may be different from the start position of the corresponding candidate resource set for sending the PDCCH, which may be determined according to the start time when the channel is idle.
  • the terminal device may determine whether each candidate resource set is the candidate resource set corresponding to the first PDCCH resource set in the current COT. If it is, the PDCCH resource set for blind detection may be different For the candidate resource set, if it is not, the resource set for blind detection of the PDCCH may be the candidate resource set, that is, the PDCCH is acquired on the candidate resource set.
  • the network device may send second indication information, where the second indication information is used to indicate the information of the COT to which the first PDCCH belongs.
  • the terminal device may determine whether the resource set occupied by the PDCCH corresponding to each candidate resource set must be the same as the candidate resource set based on the COT information.
  • the COT information mentioned in the embodiments of the present application may include the length of the COT, and/or the starting point and/or ending point of the COT, and so on.
  • the terminal device can compare the time domain start position and end position of the first resource set with the time domain start position and end position of COT, and the time domain start position of the first resource set is later than or equal to the time domain of COT
  • blind detection may be performed on the first resource set, that is, the first resource set is determined as the second resource set.
  • the base station may acquire the channel occupation at the second symbol, once the channel is occupied, it can continue to occupy the channel for a period of time.
  • the transmission of this DRS only affects the transmission of the first DRS, and the subsequent DRS transmission can still use two-symbol CORESET.
  • the UE can always detect blindly according to the two kinds of CORESET, and can also know whether the DRS to be received is the first DRS sent after the base station obtains the channel occupation according to some indication information.
  • COT indication information or COT starting point and/or ending point, COT duration and other information, determine the DRS transmission situation in COT, determine CORESET, and determine whether it is necessary to perform blind detection of PDCCH according to more than one CORESET.
  • the UE can determine whether it is necessary to perform blind detection of the PDCCH according to more than one CORESET through the indication information, so as to prevent the UE from always performing blind detection according to more than one CORESET and reduce power consumption.
  • the embodiment of the present application takes the transmission and detection of the PDCCH as an example for description, and the method of the embodiment of the present application may also be used for the transmission and detection of the PDSCH.
  • the network device performs channel detection based on the first resource set candidate for sending the physical downlink control channel PDCCH; when the network device detects that the channel is idle, the network device performs channel detection on the second resource set Send the first PDCCH; wherein the time domain start position of the second resource set is determined based on the start time of successful channel detection, or the time domain start position of the second resource set is the first resource set Or, the second resource set is the first resource set indicated by the network device. Therefore, the embodiment of the present application can implement the transmission of the PDCCH on the unlicensed spectrum.
  • FIG. 12 is a schematic block diagram of a network device 300 according to an embodiment of the present application.
  • the network device 300 includes a communication unit 310.
  • the communication unit 310 is configured to: perform channel detection based on the first resource set candidate for sending the physical downlink control channel PDCCH; in the case of detecting that the channel is idle, send the first PDCCH on the second resource set;
  • the time domain start position of the second resource set is determined based on the start time of successful channel detection, or the time domain start position of the second resource set is the time domain start position of the first resource set.
  • the first resource set and the second resource set at least partially overlap in the time domain.
  • the communication unit 310 is further configured to:
  • the first PDCCH is a part of the discovery reference signal DRS.
  • the second resource set includes at least one first symbol, and the at least one first symbol is the first at least one symbol among the symbols occupied by the DRS.
  • the second resource set includes at least one second symbol, and the at least one second symbol is the last at least one symbol among the symbols occupied by the DRS.
  • the symbols occupied by the DRS are continuous.
  • the first resource set is composed of at least one third symbol, and the at least one third symbol is the first at least one symbol among the symbols that are candidate for sending the DRS.
  • the communication unit 310 is further configured to:
  • Sending second indication information where the second indication information is used to indicate the information of the channel occupation time COT to which the first PDCCH belongs.
  • network device 300 may be used to implement the corresponding operations implemented by the network device in the method embodiments of the present application. For the sake of brevity, details are not described herein again.
  • FIG. 13 is a schematic block diagram of a terminal device 400 according to an embodiment of the present application.
  • the terminal device 400 includes a communication unit 410.
  • the communication unit 410 is configured to: detect the first physical downlink control channel PDCCH on the second resource set; wherein the time domain start position of the second resource set is later than the time of the first resource set candidate for transmitting the PDCCH
  • the domain start position, or the time domain start position of the second resource set is the time domain start position of the first resource set.
  • the first resource set and the second resource set at least partially overlap in the time domain.
  • the time domain start position of the second resource set is later than the time domain start position of the first resource set
  • the communication unit 410 is further configured to:
  • the communication unit 410 is further configured to: receive first indication information
  • the terminal device 400 further includes a processing unit 420, configured to determine, based on the first indication information, that the time domain start position of the second resource set is the time domain start position of the first resource set.
  • the first PDCCH is a part of the discovery reference signal DRS.
  • the second resource set includes at least one first symbol, and the at least one first symbol is the first at least one symbol among the symbols occupied by the DRS.
  • the second resource set includes at least one second symbol, and the at least one second symbol is the last at least one symbol among the symbols occupied by the DRS.
  • the symbols occupied by the DRS are continuous.
  • the first resource set is composed of at least one third symbol, and the at least one third symbol is the first at least one symbol among the symbols that are candidate for sending the DRS.
  • the communication unit 410 is further configured to: receive second indication information, where the second indication information is used to indicate the information of the channel occupation time COT to which the first PDCCH belongs.
  • the terminal device 400 further includes a processing unit 420, configured to determine the time domain start position of the second resource set based on the second indication information.
  • terminal device 400 may be used to implement corresponding operations implemented by the terminal device in the method embodiments of the present application, and for the sake of brevity, details are not described herein again.
  • FIG. 14 is a schematic structural diagram of a communication device 500 provided by an embodiment of the present application.
  • the communication device 500 shown in FIG. 14 includes a processor 510, and the processor 510 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the communication device 500 may further include a memory 520.
  • the processor 510 may call and run a computer program from the memory 520 to implement the method in the embodiment of the present application.
  • the memory 520 may be a separate device independent of the processor 510, or may be integrated in the processor 510.
  • the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.
  • the transceiver 530 may include a transmitter and a receiver.
  • the transceiver 530 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 500 may specifically be a network device in an embodiment of the application, and the communication device 500 may implement the corresponding process implemented by the network device in each method of the embodiment of the application. For brevity, details are not repeated here .
  • the communication device 500 may specifically be a mobile terminal/terminal device of an embodiment of the present application, and the communication device 500 may implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application. For simplicity , I won’t repeat it here.
  • FIG. 15 is a schematic structural diagram of a chip of an embodiment of the present application.
  • the chip 600 shown in FIG. 15 includes a processor 610, and the processor 610 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 600 may further include a memory 620.
  • the processor 610 can call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.
  • the chip 600 may further include an input interface 630.
  • the processor 610 can control the input interface 630 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.
  • the chip 600 may further include an output interface 640.
  • the processor 610 can control the output interface 640 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application.
  • chips mentioned in the embodiments of the present application may also be referred to as system-level chips, system-on-chips, system-on-chips, or system-on-chips.
  • the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be Read-Only Memory (ROM), Programmable Read-Only Memory (Programmable ROM, PROM), Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), and Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.
  • the embodiments of the present application also provide a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application For the sake of brevity, I won’t repeat it here.
  • the embodiments of the present application also provide a computer program product, including computer program instructions.
  • the computer program product can be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • it is not here. Repeat it again.
  • the computer program product can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, For the sake of brevity, I will not repeat them here.
  • the embodiment of the application also provides a computer program.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • the computer program is run on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • I won’t repeat it here.
  • the computer program can be applied to the mobile terminal/terminal device in the embodiments of the present application.
  • the computer program runs on the computer, the computer can execute each method in the embodiments of the present application. For the sake of brevity, the corresponding process will not be repeated here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

Les modes de réalisation de la présente invention concernent un procédé de communication sans fil pour spectre sans licence, ainsi qu'un dispositif, pouvant effectuer la transmission d'un PDCCH sur un spectre sans licence. Le procédé comprend les étapes au cours desquelles : un dispositif de réseau effectue une détection de canal sur la base d'un premier ensemble de ressources candidates permettant d'envoyer un canal physique de commande de liaison descendante (PDCCH) ; et, lorsqu'il détecte qu'un canal est inactif, le dispositif de réseau envoie un premier PDCCH sur un second ensemble de ressources, une position de début dans le domaine temporel du second ensemble de ressources étant déterminée sur la base de l'heure de début d'une détection de canal réussie, ou la position de début dans le domaine temporel du second ensemble de ressources étant la position de début dans le domaine temporel du premier ensemble de ressources.
PCT/CN2019/072951 2019-01-24 2019-01-24 Procédé de communication sans fil pour spectre sans licence, et dispositif WO2020150957A1 (fr)

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