WO2023035252A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2023035252A1
WO2023035252A1 PCT/CN2021/117831 CN2021117831W WO2023035252A1 WO 2023035252 A1 WO2023035252 A1 WO 2023035252A1 CN 2021117831 W CN2021117831 W CN 2021117831W WO 2023035252 A1 WO2023035252 A1 WO 2023035252A1
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WIPO (PCT)
Prior art keywords
lbt
channel
detection
time slot
channel corresponding
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PCT/CN2021/117831
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English (en)
Chinese (zh)
Inventor
赵楠德
马东俊
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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 PCT/CN2021/117831 priority Critical patent/WO2023035252A1/fr
Priority to CN202180099041.9A priority patent/CN117480850A/zh
Publication of WO2023035252A1 publication Critical patent/WO2023035252A1/fr

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  • the present application relates to the technical field of communication, and in particular to a communication method and device.
  • Listen Before Talk is a clear channel assessment (Clear Channel Access, CCA) mechanism for wireless channel access in unlicensed frequency bands, which is used to promote spectrum sharing among devices in wireless networks and improve channel utilization and reduce transmission collisions.
  • CCA Clear Channel Access
  • the existing wireless channel access scheme in the unlicensed frequency band is designed based on omnidirectional channel monitoring.
  • the interference detected by omnidirectional channel listening is often not consistent with the interference level experienced when transmitting beam-based. Therefore, in the unlicensed frequency band based on multi-beam communication, a channel access scheme based on directional channel monitoring should be adopted to perform multi-beam LBT to ensure that the interference detected during channel monitoring is consistent with the interference level experienced during beam-based transmission.
  • Embodiments of the present application provide a communication method and device to solve the problem in the prior art that the LBT process takes too long before transmission in an unlicensed frequency band of multi-beam communication.
  • the first aspect of the present application provides a communication method, which is applied to a terminal device or a network device, and the method includes:
  • At least one beam in the beam set performs channel detection through the first LBT.
  • the time domain resources occupied by the first LBT are smaller than the time domain resources occupied by the second LBT.
  • before performing the channel detection of listen-before-talk LBT on each beam of the beam set in the channel occupancy time it further includes:
  • the number of beams for channel detection performed by the first LBT is determined according to a preset value.
  • performing listen-before-talk LBT channel detection on each beam of the beam set in the channel occupancy time includes:
  • the method further includes:
  • the beams in the beam set detect that the channel is occupied when performing channel detection through the first LBT, perform channel detection on the beams whose channels are occupied through the second LBT.
  • the first LBT is used to detect the channel corresponding to the beam in the first listening time slot until it is detected that the channel corresponding to the beam is in the first listening time slot When it is idle, the access to the channel corresponding to the beam is terminated.
  • the second LBT is used to continuously detect the channel corresponding to the beam for the second listening time slot until it is detected that the channel corresponding to the beam is in the second listening time slot.
  • the access to the channel corresponding to the beam ends.
  • the initial value of the target counter is a random number between zero and the maximum value of the contention window.
  • the target counter is configured to decrement by one each time it is detected that the channel corresponding to the beam is idle in the third listening time slot.
  • the channel detection of the LBT is performed according to a sequence of beam indexes of each beam in the beam set.
  • the second LBT is further configured to start the target timer each time it is detected that the channel corresponding to the beam is idle in the second listening time slot, and The channel corresponding to the beam performs the detection of the third listening time slot.
  • the steps include:
  • the method further includes:
  • the channel detection of the LBT is performed according to the execution state identification polling of each beam in the beam set.
  • the execution state identifier includes a first identifier, a second identifier and a third identifier, the first identifier is used to indicate that the channel detection of the LBT has not been completed, and the second identifier It is used to indicate that the channel detection of the LBT has been completed, and the third identifier is used to indicate that the channel corresponding to the beam is detected to be idle in the second listening time slot.
  • the beam performs channel detection of the first LBT and detects that the channel corresponding to the beam is idle in the first listening time slot, the execution state of the beam is marked by The first identifier is changed to the second identifier.
  • the execution state of the beam is marked by The first identifier is changed to the third identifier.
  • the execution state of the polled beam is marked as the third identifier, start the target timer and perform detection of the third listening time slot on the channel corresponding to the beam .
  • the execution state of the beam is identified by the third The identifier is changed to the second identifier.
  • the execution state identifier of the beam is changed from the third identifier to the first a logo.
  • each beam in the beam set performs data transmission after detecting that a channel is idle, or, performs data transmission after all beams in the beam set detect that a channel is idle.
  • performing the channel detection of listen-before-talk LBT on each beam of the beam set in the channel occupancy time further includes:
  • the beam set is spatially dispersed or when the LBT is performed on the wide beam covering the beam set, it is continuously detected that the channel corresponding to the wide beam is occupied for a number of times exceeding the first number threshold, then for the beam set Each beam performs channel detection for the LBT.
  • performing the channel detection of listen-before-talk LBT on each beam of the beam set in the channel occupancy time further includes:
  • a second aspect of the present application provides a communication device, and the method includes:
  • a processing module configured to perform channel detection on each beam of the beam set in the channel occupancy time through a listen-before-talk LBT, and the LBT includes a first LBT and a second LBT;
  • At least one beam in the beam set performs channel detection through the first LBT.
  • the time domain resources occupied by the first LBT are smaller than the time domain resources occupied by the second LBT.
  • the processing module is further configured to determine the number of beams for performing channel detection through the first LBT according to a preset value.
  • the processing module is specifically configured to perform channel detection on each beam in the beam set through the first LBT.
  • the processing module is specifically configured to detect that a channel is occupied when the beams in the beam set perform channel detection through the first LBT, and pass through the occupied beam The second LBT performs channel detection.
  • the first LBT is used to detect the channel corresponding to the beam in the first listening time slot until it is detected that the channel corresponding to the beam is in the first listening time slot When it is idle, the access to the channel corresponding to the beam is terminated.
  • the second LBT is used to continuously detect the channel corresponding to the beam for the second listening time slot until it is detected that the channel corresponding to the beam is in the second listening time slot.
  • the access to the channel corresponding to the beam ends.
  • the initial value of the target counter is a random number between zero and the maximum value of the contention window.
  • the target counter is configured to decrement by one each time it is detected that the channel corresponding to the beam is idle in the third listening time slot.
  • the channel detection of the LBT is performed according to a sequence of beam indexes of each beam in the beam set.
  • the second LBT is further configured to start the target timer and control the beam every time it is detected that the channel corresponding to the beam is idle in the second listening slot The corresponding channel performs the detection of the third monitoring time slot.
  • the processing module is specifically configured to, if it is detected that the channel corresponding to the beam is idle in the third listening time slot and the target counter is not zero, repeatedly The corresponding channel performs the detection of the third monitoring time slot.
  • the processing module is specifically configured to repeat the second monitoring on the channel corresponding to the beam if it is detected that the channel corresponding to the beam is occupied during the third monitoring time slot detection.
  • the channel detection of the LBT is performed according to the execution state identification polling of each beam in the beam set.
  • the execution state identifier includes a first identifier, a second identifier and a third identifier, the first identifier is used to indicate that the channel detection of the LBT has not been completed, and the second identifier It is used to indicate that the channel detection of the LBT has been completed, and the third identifier is used to indicate that the channel corresponding to the beam is detected to be idle in the second listening time slot.
  • the processing module is specifically configured to: if the beam performs channel detection of the first LBT and detects that the channel corresponding to the beam is idle in the first listening time slot, then The execution state identifier of the beam is changed from the first identifier to the second identifier.
  • the processing module is specifically configured to: if the beam performs channel detection of the second LBT and detects that the channel corresponding to the beam is idle in the second listening time slot, then The execution state identifier of the beam is changed from the first identifier to the third identifier.
  • the processing module is specifically configured to: if the execution status of the polled beam is marked as the third identifier, start the target timer and set the channel corresponding to the beam Do the detection of the third listening time slot.
  • the processing module is specifically configured to, if it is detected that the channel corresponding to the beam is idle during the third monitoring and the target counter is not zero, repeatedly The corresponding channel performs the detection of the third monitoring time slot.
  • the processing module is specifically configured to: if it is detected that the channel corresponding to the beam is idle during the third monitoring and the target counter is zero, the The execution status flag is changed from the third flag to the second flag.
  • the processing module is specifically configured to, if it is detected that the channel corresponding to the beam is occupied during the third monitoring, mark the execution state of the beam by the The third identifier is changed to the first identifier.
  • each beam in the beam set performs data transmission after detecting that a channel is idle, or, performs data transmission after all beams in the beam set detect that a channel is idle.
  • the processing module is further configured to continuously detect the channel corresponding to the wide beam if the beam set is spatially dispersed or when the LBT is performed on the wide beam covering the beam set If the number of times of being occupied exceeds the first number threshold, perform channel detection of the LBT on each beam of the beam set.
  • the processing module is further configured to continuously detect that the channel corresponding to the first beam is occupied for more than If the number of times threshold is the second, the execution of the LBT on the first beam in the beam set is abandoned.
  • the fifth aspect of the present application provides an electronic device, including:
  • the memory stores computer-executable instructions
  • the processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method as described in the first aspect.
  • a fourth aspect of the present application provides a chip, including: a processor, configured to invoke and run a computer program from a memory, so that a device installed with the chip executes the method described in the first aspect.
  • a fifth aspect of the present application provides a computer-readable storage medium for storing a computer program, and the computer program causes a computer to execute the method as described in the first aspect.
  • a sixth aspect of the present application provides a computer program product, including computer instructions, and when the computer instructions are executed by a processor, the method as described in the first aspect is implemented.
  • a seventh aspect of the present application provides a computer program, the computer program causes a computer to execute the method described in the first aspect.
  • the eighth aspect of the present application provides a device, which may include: at least one processor and an interface circuit, and the program instructions involved are executed in the at least one processor, so that the communication device implements the communication device described in the first aspect.
  • a ninth aspect of the present application provides a communication device, the device is used to execute the method described in the first aspect.
  • the terminal device or the network device performs channel detection on each beam of the beam set in the channel occupancy time through a listen-before-talk LBT, and the LBT includes a first LBT and a second LBT, wherein, At least one beam in the beam set performs channel detection through the first LBT.
  • the LBT includes a first LBT and a second LBT, wherein, At least one beam in the beam set performs channel detection through the first LBT.
  • FIG. 1 is a schematic diagram of a scenario of a communication method provided by an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a communication method provided in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a wide beam additionally detecting interference provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a beam interference gap provided by an embodiment of the present application.
  • FIG. 5a is a schematic diagram of a multi-beam LBT when beam space division multiplexing is provided in an embodiment of the present application
  • FIG. 5b is a schematic diagram of a multi-beam LBT with beam time division multiplexing provided in an embodiment of the present application
  • FIG. 6a is a schematic diagram of another multi-beam LBT in beam space division multiplexing according to an embodiment of the present application.
  • FIG. 6b is a schematic diagram of another beam time division multiplexing time multi-beam LBT provided by the embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • Fig. 9a is a schematic diagram of yet another multi-beam LBT in beam space division multiplexing provided by the embodiment of the present application.
  • FIG. 9b is a schematic diagram of yet another multi-beam LBT with beam time division multiplexing provided by the embodiment of the present application.
  • FIG. 10 is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • Fig. 11a is a schematic diagram of another multi-beam LBT in beam space division multiplexing provided by the embodiment of the present application.
  • Fig. 11b is a schematic diagram of yet another multi-beam LBT with beam time division multiplexing provided in the embodiment of the present application;
  • FIG. 12 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • Fig. 13a is a schematic diagram of yet another multi-beam LBT in beam space division multiplexing provided by the embodiment of the present application;
  • Fig. 13b is a schematic diagram of yet another multi-beam LBT with beam time division multiplexing provided by the embodiment of the present application;
  • FIG. 14 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • the LBT mechanism includes the following steps S11-S17:
  • the device initiating the transmission Before performing data transmission on one or a group of working channels, the device initiating the transmission performs a Clear Channel Assessment (CCA) check on the working channels.
  • CCA Clear Channel Assessment
  • the device initiating the transmission shall perform a CCA check using "energy detection”.
  • the working channel is considered to occupy a time slot of 5 ⁇ s. Accordingly, a device initiating a transmission should observe the working channel during a CCA observation time measured by a number of slot times.
  • S14 The CCA check is initiated at the end of the time slot occupied by the working channel. If it is observed in the CCA check that the working channel is not occupied for at least 8 ⁇ s, a transmission delay occurs. This transmission delay shall last at least a random number (0 to maximum) of listen slots. Among them, the maximum value of the random number shall not be less than 3.
  • S15 The total time that the device initiating the transmission uses the working channel is defined as the channel occupation time.
  • the channel occupation time should be less than 5 ms. Subsequently, a new CCA check can be performed according to the above steps S11-S13.
  • S16 The device that initiates or does not initiate transmission can skip the CCA check after correctly receiving the data packet sent to it, and immediately transmit in response to the received frame. Without a new CCA check, the continuous transmission sequence of the device shall not exceed the 5ms channel occupation time specified in S15 above.
  • the energy detection threshold S of the CCA check can be determined by formula (1).
  • X is the working channel bandwidth, and its unit is MHz
  • P out is the equivalent isotopically radiated power (EIRP) of the radio frequency (Radio Frequency, RF) output
  • P max is the maximum power of the radio frequency output.
  • the channel access solution is described below.
  • a network device that transmits on a channel shall perform the following four types of channel access procedures to access the channel on which the transmission is performed.
  • the network device can send a transmission after detecting that the channel is idle for the first time and the counter N is 0 in the listening time slot with a duration of T d .
  • the counter N can be adjusted by detecting the channel through an additional listening time slot, and the specific process is shown in steps S21-S26:
  • step S24 is executed.
  • N init is a uniformly distributed random number between 0 and CW p .
  • S23 Perform a monitoring time slot detection with a time length of T sl on the channel.
  • T sl represents the LBT monitoring time slot, and the length is 9 ⁇ s.
  • S25 Perform monitoring time slot detection on the channel with a time length of T d .
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • T d T f + mp *T sl ⁇ s.
  • S26 Determine whether the channel monitoring result is that all monitoring time slots are idle within T d .
  • CW p is the contention window size corresponding to channel access priority p.
  • the gap between the start position of the transmission and the end position of the previous transmission is 16 ⁇ s.
  • T f includes 1 LBT monitoring time slot in its last 9 ⁇ s, and if the channel is detected to be idle for a total of at least 5 ⁇ s in the monitoring time slot, the channel monitoring result is considered to be idle.
  • the network device directly transmits without performing channel detection after the gap ends.
  • the gap between the start position of the transmission and the end position of the previous transmission is less than or equal to 16 ⁇ s, and the length of the transmission does not exceed 584 ⁇ s.
  • the existing wireless channel access scheme in the unlicensed frequency band is designed based on omnidirectional channel monitoring.
  • the interference detected by omnidirectional channel listening is often not consistent with the interference level experienced when transmitting beam-based. Therefore, in the unlicensed frequency band based on multi-beam communication, a channel access scheme based on directional channel monitoring should be adopted to perform multi-beam LBT to ensure that the interference detected during channel monitoring is consistent with the interference level experienced during beam-based transmission.
  • the embodiments of the present application provide a communication method and device, which perform short LBT on some of the beams in the beam set, so that it is not necessary to perform a complete conventional LBT channel detection process on all beams, thereby reducing the need for transmission.
  • the time-domain resource of the LBT alleviates the problem of inter-beam blocking.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • LTE-A Long Term Evolution
  • NR New Radio
  • NR NR system evolution system
  • LTE LTE-based access to unlicensed spectrum, LTE-U
  • NR-based access to unlicensed spectrum, NR-U system on unlicensed frequency band
  • UMTS Universal Mobile Telecommunications System
  • WiMAX Worldwide Interoperability for Microwave Access
  • FIG. 1 is a schematic diagram of a scenario of a communication method provided by an embodiment of the present application.
  • a terminal device 101 and a network device 102 interact with each other.
  • LBT channel detection may be performed on each beam of the beam set in the channel occupancy time.
  • the LBT may include a first LBT and a second LBT, and the beam set includes at least one beam performing the first LBT.
  • the first LBT may be a short LBT
  • the second LBT may be a regular LBT.
  • the time domain resources occupied by the first LBT are smaller than the time domain resources occupied by the second LBT.
  • terminal device 101 includes but not limited to satellite or cellular phone, personal communication system (Personal Communications System, PCS) terminal that can combine cellular radiotelephone and data processing, facsimile and data communication capability; Can include radiotelephone, pager, Internet/ PDAs with intranet access, web browsers, organizers, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices.
  • PCS Personal Communications System
  • PCS Personal Communications System
  • GPS Global Positioning System
  • the terminal equipment may refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or user device.
  • the access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolved PLMNs, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the network device 102 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located within the coverage area.
  • the network device 102 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, may also be a base station (NodeB, NB) in a WCDMA system, or may be an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (Cloud Radio Access Network, CRAN), or the network device can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network devices in the 5G network or network devices in the future evolution of the Public Land Mobile Network (PLMN), etc.
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • LTE Long Term Evolutional Node B, eNB or eNodeB
  • CRAN
  • FIG. 2 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • the subject of execution of the embodiments of the present application is a terminal device or a network device, and involves a process of how to perform LBT channel detection. As shown in Figure 2, the method includes:
  • the LBT includes a first LBT and a second LBT, and at least one beam in the beam set performs channel detection through the first LBT.
  • P beams can be used in the COT to form a beam set ⁇ beam 1 ,...,beam P ⁇ , and the above P beams
  • the COT may be spatial division multiplexing (Spatial Division Multiplexing, SDM) or time division multiplexing (Time Division Multiplexing, TDM), which is not limited in this embodiment of the present application.
  • the embodiment of the present application does not limit the first LBT and the second LBT.
  • the time domain resources occupied by the first LBT are smaller than the time domain resources occupied by the second LBT.
  • Cat-2 LBT Cat-2 LBT
  • Cat-4LBT Cat-4LBT
  • the embodiment of the present application does not limit how to perform the first LBT in the beam set.
  • the following provides two ways to perform the first LBT in the beam set.
  • the number of beams for channel detection through the first LBT may be determined according to a preset value.
  • Q beams may be selected from the beam set ⁇ beam 1 ,..., beam P ⁇ to perform the first LBT, where 0 ⁇ Q ⁇ P, then the remaining PQ beams perform the second LBT.
  • channel detection is performed on each beam in the beam set through the first LBT.
  • the channel detection is performed on the beams whose channels are occupied through the second LBT.
  • all beams in the beam set ⁇ beam 1 ,...,beam P ⁇ use short LBT by default, and if beam p detects that the channel is occupied in the listening time slot, it enters the second LBT process.
  • the first LBT is used to detect the channel corresponding to the beam in the first listening time slot until it is detected that the channel corresponding to the beam is idle in the first listening time slot, and the process of accessing the channel corresponding to the beam is ended.
  • the detection of the first listening time slot can be performed on the channel, and the detection result of the first listening time slot can be that at least one listening time slot is occupied, or it can be that all listening time slots are occupied. slots are free. If the result of the channel detection is that the channel corresponding to the beam is occupied in the first listening time slot, continue to detect the channel in the first listening time slot. If the result of the channel detection is that the channel corresponding to the beam is idle in the first listening time slot, the access to the channel corresponding to the beam is terminated.
  • the first listening time slot may be a listening time slot with a time length T cat2 .
  • the second LBT is used to continuously detect the channel corresponding to the beam in the second listening time slot until it is detected that the channel corresponding to the beam is idle in the second listening time slot and the target counter is 0.
  • the initial value of the target counter is a random number between zero and the maximum value of the contention window.
  • the target counter is used to decrease by one each time it is detected that the channel corresponding to the beam is idle in the third listening time slot.
  • the second listening time slot may be a listening time slot with a time length T d .
  • the third listening time slot may be a listening time slot with a time length T sl .
  • the channel detection of the LBT may be performed according to the order of the beam indexes of each beam in the beam set.
  • the second LBT is also used to start the target timer and detect the channel corresponding to the beam in the third listening time slot each time it is detected that the channel corresponding to the beam is idle in the second listening time slot. If it is detected that the channel corresponding to the beam is idle in the third listening time slot and the target counter is not zero, repeat the detection of the channel corresponding to the beam in the third listening time slot. If it is detected that the channel corresponding to the beam is occupied during the third monitoring, repeating the detection of the channel corresponding to the beam for the second monitoring time slot.
  • the LBT channel detection may be performed according to the execution state identification polling of each beam in the beam set.
  • the execution state identification includes a first identification, a second identification and a third identification
  • the first identification is used to represent the channel detection of unfinished LBT
  • the second identification is used to represent the channel detection of completed LBT
  • the third identification is used to represent It is detected that the channel corresponding to the beam is idle in the second listening time slot.
  • the execution status flag of the beam is changed from the first flag to the second flag. If the beam performs the channel detection of the second LBT and detects that the channel corresponding to the beam is idle in the second listening time slot, the execution status flag of the beam is changed from the first flag to the third flag. If the execution state of the polled beam is marked as the third mark, start the target timer and perform detection of the third listening time slot on the channel corresponding to the beam.
  • the execution status flag of the beam is changed from the third flag to the second flag. If it is detected that the channel corresponding to the beam is occupied during the third monitoring, the execution state identifier of the beam is changed from the third identifier to the first identifier.
  • a fallback mechanism may also be set in the multi-beam LBT solution.
  • a fallback mechanism may be set in different LBT schemes.
  • LBT channel detection is performed on each beam of the beam set.
  • an LBT channel detection is performed based on a wide beam that can cover the beam set.
  • FIG. 3 is a schematic diagram of a wide beam additionally detecting interference provided in an embodiment of the present application. As shown in FIG. 3 , interference between beams beam1 and beam2 is additionally detected by a wide beam. Therefore, through spatial determination, a more appropriate LBT detection method can be selected.
  • an LBT channel detection can be performed based on a wide beam that can cover the beam set first. If LBT is performed on the wide beam that covers the beam set, it is continuously detected that the channel corresponding to the wide beam is occupied for more than the first time. Once the number threshold is K, fall back to performing LBT channel detection on each beam of the beam set. In this manner, the time domain resources occupied by the LBT can be reduced.
  • the embodiment of the present application does not limit the threshold of the first number of times, for example, it may be 3 times, 5 times, and so on.
  • a fallback mechanism may also be set during the execution of the LBT.
  • FIG. 4 is a schematic diagram of a beam interference gap provided by an embodiment of the present application. As shown in FIG. 4 , the beam interference of beam1 is small, and the beam interference of beam2 is relatively large.
  • the first beam in the beam set is abandoned. LBT. In this way, the LBT process of beams with high interference experienced by the direction can be abandoned, thereby reducing the impact on the efficiency of the multi-beam LBT scheme when the interference level of a single beam direction is high.
  • the embodiment of the present application does not limit the second number of times threshold, for example, it may be 3 times, 5 times, and so on.
  • the channel corresponding to the beam of the beam set may be used for data transmission.
  • each beam in the beam set may perform data transmission after detecting that the channel is idle. In some other embodiments, data transmission may be performed after all beams in the beam set detect that the channel is idle.
  • FIG. 5a is a schematic diagram of a multi-beam LBT with beam space division multiplexing provided in an embodiment of the present application
  • FIG. 5b is a schematic diagram of a multi-beam LBT with a beam time division multiplexed time provided in an embodiment of the present application
  • 6a is a schematic diagram of another multi-beam LBT with beam space division multiplexing provided in the embodiment of the present application
  • FIG. 6b is a schematic diagram of another multi-beam LBT with time division multiplexed beams provided in the embodiment of the present application. Comparing FIG. 5a with FIG. 6a, and comparing FIG. 5b with FIG. 6b, it can be seen that in FIG. 5a and FIG. 5b, data transmission is performed when beam1, beam2 and beamP are all idle. In Fig. 6a and Fig. 6b, whenever there is an idle channel in beam1, beam2 and beamP, data transmission will be performed immediately.
  • the terminal device or the network device performs channel detection on each beam of the beam set in the channel occupancy time through the listen-before-talk LBT, and the LBT includes the first LBT and the second LBT, wherein the beam set At least one of the beams performs channel detection through the first LBT.
  • the channel detection of the first LBT is performed on some of the beams in the beam set, it is not necessary to perform the complete channel detection process of the second LBT on all beams, thereby reducing the time domain resources of the LBT before transmission and reducing the The problem of blocking between different beams.
  • FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • the execution subject of the embodiment of the present application is a terminal device or a network device, as shown in Figure 7, Figure 5a and Figure 5b, the method includes:
  • the beam set can be ⁇ beam 1 ,...,beam P ⁇ , P is the number of beams in the beam set, 0 ⁇ Q ⁇ P.
  • step S306 If yes, execute step S306; if not, execute step S308.
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • step S303 If yes, execute step S303, if not, execute step S306.
  • N init is a random number uniformly distributed between 0 and the maximum value of the competition window.
  • step S303 If yes, execute step S303, if not, execute step S310.
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • each beam in the beam set can perform data transmission after detecting that the channel is idle, or all beams in the beam set can perform data transmission after detecting that the channel is idle.
  • the application embodiment does not limit this.
  • FIG. 8 is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • Fig. 9a is a schematic diagram of yet another multi-beam LBT when beams are space-division multiplexed according to an embodiment of the present application
  • Fig. 9b is a schematic diagram of another kind of multi-beam LBT when beams are time-division multiplexed according to an embodiment of the present application.
  • the execution subject of the embodiment of the present application is a terminal device or a network device, as shown in Figures 8, 9a, and 9b, the method includes:
  • step S413 If yes, execute step S413; if not, execute step S404.
  • the result of detecting the listening time slots with a time length of T cat2 on the channel may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • step S402 If yes, execute step S402, if not, execute step S406.
  • N init is a random number uniformly distributed between 0 and the maximum value of the competition window.
  • step S402 If yes, execute step S402, if not, execute step S409.
  • S410 Perform a monitoring time slot detection with a time length of T sl on the channel, and determine whether the monitoring time slot is idle.
  • step S408 If yes, execute step S408; if not, execute step S411.
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • step S408 If yes, execute step S408; if not, execute step S411.
  • each beam in the beam set can perform data transmission after detecting that the channel is idle, or all beams in the beam set can perform data transmission after detecting that the channel is idle.
  • the application embodiment does not limit this.
  • the embodiment of the present application may also identify a polling manner of performing LBT channel detection according to the execution status of each beam in the beam set.
  • FIG. 10 is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • Fig. 11a is a schematic diagram of another kind of multi-beam LBT with beam space division multiplexing provided in the embodiment of the present application
  • Fig. 11b is a schematic diagram of another kind of multi-beam LBT with beam time division multiplexing provided in the embodiment of the present application.
  • the execution subject of the embodiment of the present application is a terminal device or a network device, as shown in Figures 10, 11a, and 11b, the method includes:
  • the beam set can be ⁇ beam 1 ,...,beam P ⁇ , P is the number of beams in the beam set, 0 ⁇ Q ⁇ P.
  • step S506 If yes, execute step S506; if not, execute step S520.
  • step S507 If yes, execute step S507; if not, execute step S510.
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • step S509 If yes, execute step S509; if not, execute step S504.
  • Step S504 is executed after step S509.
  • step S511 If yes, execute step S511; if not, execute step S514.
  • step S513 If yes, execute step S513; if not, execute step S504.
  • Step S504 is executed after step S513.
  • step S517 If yes, execute step S517, if not, execute step S518.
  • Step S504 is executed after steps S517, S518, and S519.
  • FIG. 12 is a schematic flowchart of another communication method provided in the embodiment of the present application.
  • Fig. 13a is a schematic diagram of yet another multi-beam LBT when beams are space-division multiplexed according to an embodiment of the present application
  • Fig. 13b is a schematic diagram of another kind of multi-beam LBT when beams are time-division multiplexed according to an embodiment of the present application.
  • the execution subject of the embodiment of the present application is a terminal device or a network device, as shown in Figures 12, 13a, and 13b, the method includes:
  • step S605 If yes, execute step S605; if not, execute step S618.
  • step S606 If yes, execute step S606; if not, execute step S612.
  • the result of the listening time slot detection may be that at least one listening time slot is occupied, or that all listening time slots are idle.
  • step S608 If yes, execute step S608; if not, execute step S609.
  • Step S603 is executed after step S608.
  • step S611 If yes, execute step S611; if not, execute step S603.
  • Step S603 is executed after step S611.
  • step S614 If yes, execute step S614, if not, execute step S617.
  • step S615 If yes, execute step S615, if not, execute step S616.
  • Step S603 is executed after steps S615, S616, and S617.
  • the beams in the beam set can execute the first LBT or the second LBT process according to their own conditions, and improve the efficiency of the LBT process in a multi-beam communication scenario.
  • the introduction of a fallback mechanism for different LBT schemes can reduce the impact of certain high-interference beams on the LBT process and improve the efficiency of the multi-beam LBT process.
  • the aforementioned program can be stored in a computer-readable storage medium.
  • the program When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.
  • FIG. 14 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device may be implemented by software, hardware or a combination of the two, so as to execute the communication method in the foregoing embodiments.
  • the communication device 700 includes: a storage module 701 and a processing module 702 .
  • the storage module 701 is used for storing executable programs.
  • the processing module 702 is configured to perform channel detection on each beam of the beam set in the channel occupancy time by using a listen-before-talk LBT, where the LBT includes a first LBT and a second LBT.
  • At least one beam in the beam set performs channel detection through the first LBT.
  • the time domain resources occupied by the first LBT are smaller than the time domain resources occupied by the second LBT.
  • the processing module is further configured to determine the number of beams for performing channel detection through the first LBT according to a preset value.
  • the processing module is specifically configured to perform channel detection on each beam in the beam set through the first LBT.
  • the processing module 702 is specifically configured to detect that the channel is occupied when the beams in the beam set perform channel detection through the first LBT, and perform channel detection on the occupied beams through the second LBT. detection.
  • the first LBT is used to detect the channel corresponding to the beam in the first listening time slot, until it is detected that the channel corresponding to the beam is idle in the first listening time slot and the channel corresponding to the beam is ended. access.
  • the second LBT is used to continuously detect the channel corresponding to the beam in the second listening time slot until it is detected that the channel corresponding to the beam is idle in the second listening time slot and the target counter is 0 End the access of the channel corresponding to the beam.
  • the initial value of the target counter is a random number between zero and the maximum value of the contention window.
  • the target counter is configured to decrement by one each time it is detected that the channel corresponding to the beam is idle in the third listening time slot.
  • the LBT channel detection is performed according to the order of the beam indexes of each beam in the beam set.
  • the second LBT is also used to start the target timer every time it is detected that the channel corresponding to the beam is idle in the second listening time slot and perform a third listening time slot for the channel corresponding to the beam. detection.
  • the processing module 702 is specifically configured to repeat the third monitoring on the channel corresponding to the beam if it is detected that the channel corresponding to the beam is idle in the third monitoring time slot and the target counter is not zero time slot detection.
  • the processing module 702 is specifically configured to, if it is detected that the channel corresponding to the beam is occupied during the third monitoring, repeat the detection of the second monitoring time slot on the channel corresponding to the beam.
  • the LBT channel detection is performed according to the execution state identification polling of each beam in the beam set.
  • the execution state identification includes a first identification, a second identification and a third identification
  • the first identification is used to represent the channel detection of unfinished LBT
  • the second identification is used to represent the channel detection of completed LBT
  • the third identifier is used to indicate that the channel corresponding to the beam is detected to be idle in the second listening time slot.
  • the processing module 702 is specifically configured to: if the beam performs the channel detection of the first LBT and detects that the channel corresponding to the beam is idle in the first listening time slot, mark the execution state of the beam by the first LBT A mark is changed to a second mark.
  • the processing module 702 is specifically configured to, if the beam performs channel detection of the second LBT and detects that the channel corresponding to the beam is idle in the second listening time slot, mark the execution state of the beam by the first The first mark is changed to the third mark.
  • the processing module 702 is specifically configured to start the target timer and perform the third monitoring time slot for the channel corresponding to the beam if the execution state of the polled beam is marked as the third identifier. detection.
  • the processing module 702 is specifically configured to repeat the third monitoring time slot for the channel corresponding to the beam if it is detected that the channel corresponding to the beam is idle during the third monitoring and the target counter is not zero. detection.
  • processing module 702 is specifically configured to change the execution state flag of the beam from the third flag to Second logo.
  • the processing module 702 is specifically configured to change the execution state identifier of the beam from the third identifier to the first identifier if it is detected that the channel corresponding to the beam is occupied during the third monitoring.
  • each beam in the beam set performs data transmission after detecting that the channel is idle, or performs data transmission after all beams in the beam set detect that the channel is idle.
  • the processing module 702 is further configured to continuously detect that the number of times the channel corresponding to the wide beam is occupied exceeds the first number of times if the beam set is spatially dispersed or when LBT is performed on the wide beam covering the beam set threshold, LBT channel detection is performed on each beam of the beam set.
  • the processing module 702 is further configured to give up if it continuously detects that the number of times the channel corresponding to the first beam is occupied exceeds the second threshold when performing LBT on the first beam in the beam set. LBT is performed on the first beam in the set of beams.
  • the communication device provided in the embodiment of the present application can execute the actions of the communication method in the above-mentioned embodiment, and its implementation principle and technical effect are similar, and will not be repeated here.
  • FIG. 15 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • this electronic equipment can comprise: processor 81 (such as CPU), memory 82, receiver 83 and transmitter 84; Receiver 83 and transmitter 84 are coupled to processor 81, and processor 81 controls receiver 83 of the receiving action, the processor 81 controls the sending action of the transmitter 84.
  • the memory 82 may include a high-speed RAM memory, and may also include a non-volatile memory NVM, such as at least one disk memory, and various information may be stored in the memory 82 for completing various processing functions and realizing the method of the embodiment of the present application step.
  • the electronic device involved in this embodiment of the present application may further include: a power supply 85 , a communication bus 86 and a communication port 87 .
  • the receiver 83 and the transmitter 84 can be integrated in the transceiver of the electronic device, or can be an independent transceiver antenna on the electronic device.
  • the communication bus 86 is used to implement the communication connection between the components.
  • the above-mentioned communication port 87 is used to realize connection and communication between the electronic device and other peripheral devices.
  • the above-mentioned memory 82 is used to store computer-executable program codes, and the program codes include information; when the processor 81 executes the information, the information causes the processor 81 to execute the processing actions on the terminal device side in the above-mentioned method embodiments,
  • the transmitter 84 is made to perform the sending action on the terminal device side in the above method embodiment, and the receiver 83 is made to perform the receiving action on the terminal device side in the above method embodiment.
  • the implementation principles and technical effects are similar and will not be repeated here.
  • the information causes the processor 81 to execute the processing actions on the network device side in the above method embodiments, make the transmitter 84 execute the sending actions on the network device side in the above method embodiments, and cause the receiver 83 to execute
  • the implementation principles and technical effects of the receiving actions on the network device side in the foregoing method embodiments are similar, and will not be repeated here.
  • An embodiment of the present application further provides a communication system, including a terminal device and a network device, so as to implement the foregoing communication method.
  • the embodiment of the present application also provides a chip, including a processor and an interface.
  • the interface is used to input and output data or instructions processed by the processor.
  • the processor is configured to execute the methods provided in the above method embodiments.
  • the chip can be applied to terminal equipment or network equipment.
  • the present invention also provides a kind of computer-readable storage medium, and this computer-readable storage medium can comprise: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory) ), a magnetic disk or an optical disk, and other media that can store program codes.
  • the computer-readable storage medium stores program information, and the program information is used in the above-mentioned communication method.
  • the embodiment of the present application also provides a program, which is used to execute the communication method provided in the above method embodiment when executed by a processor.
  • the embodiment of the present application also provides a program product, such as a computer-readable storage medium, where instructions are stored in the program product, and when the program product is run on a computer, it causes the computer to execute the communication method provided by the above method embodiment.
  • a program product such as a computer-readable storage medium
  • An embodiment of the present application also provides a device, and the device may include: at least one processor and an interface circuit, and related program instructions are executed in the at least one processor, so that the communication device implements the communication method provided by the above method embodiment.
  • the embodiment of the present application also provides a communication device, which is configured to execute the communication method provided in the above method embodiment.
  • a computer program product includes one or more computer instructions.
  • a computer can be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, computer instructions may be sent from a website, computer, server, or data center via a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device including a server, a data center, and the like integrated with one or more available media. Available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)).

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente application concerne un procédé et un appareil de communication. Le procédé comprend les étapes suivantes: la réalisation d'une détection de canal sur chaque faisceau d'un ensemble de faisceaux dans un temps d'occupation de canal au moyen de processus d'écoute avant de parler (LBT), le processus LBT comprenant une premier processus LBT et un second processus LBT, et la détection de canal étant effectuée sur au moins un faisceau dans l'ensemble de faisceaux au moyen du premier processus LBT. Ainsi, puisque la détection de canal du premier processus LBT est effectuée sur certains faisceaux dans l'ensemble de faisceaux, il n'est pas nécessaire d'effectuer un processus de détection de canal complet du second processus LBT sur tous les faisceaux, permettant ainsi la réduction des ressources du domaine temporel de processus LBT avant la transmission, et l'atténuation du problème de blocage entre différents faisceaux.
PCT/CN2021/117831 2021-09-10 2021-09-10 Procédé et appareil de communication WO2023035252A1 (fr)

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Citations (6)

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US20190191460A1 (en) * 2017-11-20 2019-06-20 Qualcomm Incorporated Adaptive medium sensing thresholds
US20200267736A1 (en) * 2019-02-15 2020-08-20 At&T Intellectual Property I, L.P. Fast multi-beam listen before talk
US20210058967A1 (en) * 2018-02-14 2021-02-25 Idac Holdings, Inc. Methods, apparatus, and system using multiple antenna techniques for new radio (nr) operations in unlicensed bands
US20210153245A1 (en) * 2018-04-03 2021-05-20 Idac Holdings, Inc. Methods for channel access management
WO2021163411A1 (fr) * 2020-02-12 2021-08-19 Idac Holdings, Inc. Accès à un canal dans un spectre sans licence

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180115996A1 (en) * 2016-10-21 2018-04-26 Samsung Electronics Co., Ltd. Channel access framework for multi-beam operation on the unlicensed spectrum
US20190191460A1 (en) * 2017-11-20 2019-06-20 Qualcomm Incorporated Adaptive medium sensing thresholds
US20210058967A1 (en) * 2018-02-14 2021-02-25 Idac Holdings, Inc. Methods, apparatus, and system using multiple antenna techniques for new radio (nr) operations in unlicensed bands
US20210153245A1 (en) * 2018-04-03 2021-05-20 Idac Holdings, Inc. Methods for channel access management
US20200267736A1 (en) * 2019-02-15 2020-08-20 At&T Intellectual Property I, L.P. Fast multi-beam listen before talk
WO2021163411A1 (fr) * 2020-02-12 2021-08-19 Idac Holdings, Inc. Accès à un canal dans un spectre sans licence

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