WO2023155586A1 - Procédé d'accès à un canal de liaison latérale et appareil de communication - Google Patents

Procédé d'accès à un canal de liaison latérale et appareil de communication Download PDF

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Publication number
WO2023155586A1
WO2023155586A1 PCT/CN2022/140463 CN2022140463W WO2023155586A1 WO 2023155586 A1 WO2023155586 A1 WO 2023155586A1 CN 2022140463 W CN2022140463 W CN 2022140463W WO 2023155586 A1 WO2023155586 A1 WO 2023155586A1
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Prior art keywords
time unit
sub
reference signal
received signal
signal strength
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PCT/CN2022/140463
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English (en)
Chinese (zh)
Inventor
王碧钗
李雪茹
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华为技术有限公司
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Priority claimed from CN202210339478.1A external-priority patent/CN116684967A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023155586A1 publication Critical patent/WO2023155586A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the embodiments of the present application relate to the field of wireless communications, and in particular, to a sidelink channel access method and a communications device.
  • S-U Sidelink in unlicensed spectrum
  • SL-U sidelink in unlicensed spectrum
  • UE user equipment
  • LBT listen before talk
  • the present application provides a sidelink channel access method and a communication device, which can improve resource utilization.
  • a sidelink channel access method is provided, and the method can be applied in an unlicensed spectrum communication process.
  • the subject of execution of the method may be the first UE, or may be a chip applied in the first UE.
  • the following description is made by taking the execution subject as an example of the first UE.
  • the method includes:
  • the first UE receives the first reference signal from the second UE in the first time unit, the first UE detects the received signal strength in at least one sub-time unit, and the first UE detects the received signal strength according to the received signal strength of the first reference signal and at least one The received signal strength of the sub-time unit determines that the first UE performs transmission in the second time unit.
  • the relationship between at least one sub-time unit and the first time unit is as follows: all sub-time units in at least one sub-time unit are distributed in the first time unit; or, one or more sub-time units in at least one sub-time unit sub-time units are distributed in the first time unit; or, all sub-time units in at least one sub-time unit are distributed outside the first time unit.
  • the received signal strength of the first reference signal represents the received signal strength of the communication system (same system) where the first UE is located, so as to eliminate interference to itself from other UEs in the same system.
  • the received signal strength of at least one sub-time unit can not only represent the interference to itself from other UEs in the same system, but also represent the interference to itself from communication devices in other communication systems.
  • the first UE considers both the received signal strength of the same system and the received signal strength of at least one sub-time unit to determine whether each sub-time unit in at least one sub-time unit is occupied by a communication device in another communication system, Furthermore, it is determined whether it can perform transmission in the second time unit. In this way, even if other UEs in the same system occupy the channel before the second time unit, the first UE can occupy the channel with other UEs in the same system in a time-division multiplexing manner, thereby improving resource utilization.
  • the detecting the received signal strength by the first UE on at least one sub-time unit includes: detecting the received signal strength by the first UE on the first sub-time unit, and at least one sub-time unit includes the first sub-time unit
  • the first sub-time unit is a sub-time unit in which the second UE sends a signal in the first time unit.
  • all sub-time units in at least one sub-time unit are located in the first time unit, and each sub-time unit in at least one sub-time unit may be the first sub-time unit.
  • the first UE detects the received signal strength in the first sub-time unit.
  • the first UE detecting the received signal strength on at least one sub-time unit includes: the first UE detecting the received signal strength on a second sub-time unit, at least one sub-time unit including the second sub-time
  • the second sub-time unit is a sub-time unit in which the second UE does not send a signal.
  • each sub-time unit in at least one sub-time unit may be a second sub-time unit. All sub-time units in at least one sub-time unit may be located in the first time unit; or, all sub-time units in at least one sub-time unit may be located outside the first time unit.
  • the first UE detects the received signal strength in the second sub-time unit.
  • the detecting the received signal strength by the first UE on at least one sub-time unit includes: detecting the received signal strength by the first UE on the first sub-time unit, and at least one sub-time unit includes the first sub-time unit
  • the first sub-time unit is a sub-time unit in which the second UE sends a signal in the first time unit.
  • the first UE detects received signal strength on a second sub-time unit, at least one sub-time unit includes the second sub-time unit, and the second sub-time unit is a sub-time unit in which the second UE does not send a signal.
  • At least one sub-time unit includes a certain number of first sub-time units and a certain number of second sub-time units.
  • the first sub-time units may be distributed within the first time unit, and the second sub-time units may be distributed within the first time unit or outside the first time unit.
  • the first UE detects received signal strength on the first sub-time unit and the second sub-time unit.
  • the first UE determines that the first UE transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: the first UE according to the first sub-time unit The received signal strength of a reference signal and the received signal strength of at least one sub-time unit, determine the busy state of each sub-time unit in the at least one sub-time unit, when the number of sub-time units in the idle state in the at least one sub-time unit is greater than or equal to N1, the first UE transmits in the second time unit, where N1 is a positive integer randomly generated by the first UE.
  • the channel access type adopted by the first UE is type (Type) 1 channel access.
  • the first UE determines that the first UE transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: the first UE according to the first sub-time unit The received signal strength of a reference signal and the received signal strength of at least one sub-time unit, determine the busy state of each sub-time unit in the at least one sub-time unit, when the number of sub-time units in the idle state in the at least one sub-time unit is greater than or equal to N2, the first UE transmits in the second time unit, where N2 is a predefined positive integer.
  • the channel access type adopted by the first UE is type (Type) 2 channel access.
  • the first UE determines the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: when When the first strength is less than the first threshold, the first UE determines that the first sub-time unit is in an idle state; when the first strength is greater than or equal to the first threshold, the first UE determines that the first sub-time unit is in a busy state; wherein, A strength is a difference between the received signal strength of the first sub-time unit and the received signal strength of the first reference signal.
  • the received signal strength of the first sub-time unit includes not only the received signal strength of the same system, but also the received signal strength of other communication systems (different systems) except the communication system where the first UE is located, the first reference signal is sent by other UEs of the same system, such as the second UE, and the received signal strength of the first reference signal represents the received signal strength of the same system. Therefore, the received signal strength of the first sub-time unit is different from that of the first reference signal
  • the difference between the received signal strengths, that is, the first strength may represent the received signal strengths of the different systems, so that the first UE determines the busy state of the first sub-time unit based on the received signal strengths of the different systems.
  • the first UE can still use the Type1 channel access process or Type2 channel access A process of accessing a channel and performing transmission in a second time unit.
  • the first UE determines the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: when When the second strength is less than the first threshold, the first UE determines that the second sub-time unit is in an idle state; when the second strength is greater than or equal to the first threshold, the first UE determines that the second sub-time unit is in a busy state; where at least A sub-time unit further includes a second sub-time unit, and the second strength is the received signal strength of the second sub-time unit.
  • the received signal strength of the second sub-time unit includes the received signal strength of the different system and does not include the received signal strength of the same system
  • the received signal strength of the second sub-time unit can represent the different system signal strength, so that the first UE determines the busy/idle status of the second sub-time unit based on the signal strength of the different system. Even if other UEs in the same system occupy the first time unit before the second time unit, it does not affect the determination of the busy state of the second sub-time unit by the first UE.
  • the first UE can still use the Type1 channel access procedure or the Type2 channel access procedure to access the channel.
  • the transmission is performed on two time units.
  • the first UE determines the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: when When the second strength is less than the sixth threshold, the first UE determines that the second sub-time unit is in an idle state; when the second strength is greater than or equal to the sixth threshold, the first UE determines that the second sub-time unit is in a busy state; wherein, The received signal strength of a reference signal is greater than a second threshold, and the second strength is the received signal strength of the second sub-time unit.
  • the first UE may determine that the second UE sends information through the physical channel in the first time unit. Moreover, the receiving strength of the first reference signal is relatively high, and correspondingly, the distance between the first UE and the second UE is relatively short.
  • the resource sensing results of the first UE and the second UE are similar, and the first UE and the second UE may share a channel. For the first UE, the first UE may use the Type2 channel access procedure to access the channel, and perform transmission in the second time unit.
  • the busy state of the second sub-time unit since the busy state of the second sub-time unit is determined based on the second intensity, even if other UEs in the same system occupy the first time unit before the second time unit, they will not Influencing the first UE to determine the busy/idle status of the second sub-time unit.
  • the first UE can still use the Type2 channel access procedure to access the channel and perform transmission in the second time unit.
  • the first reference signal includes a physical sidelink control channel demodulation reference signal PSCCH DMRS, so as to send the first reference signal when sending the PSCCH.
  • PSCCH DMRS physical sidelink control channel demodulation reference signal
  • the first reference signal includes a physical sidelink shared channel demodulation reference signal PSSCH DMRS, so as to send the first reference signal when sending the PSSCH.
  • PSSCH DMRS physical sidelink shared channel demodulation reference signal
  • the first reference signal includes a preconfigured sequence. That is to say, the sequence of the first reference signal is the sequence configured by the first UE during factory configuration. In this case, different UEs in the same system use the same sequence when sending reference signals.
  • the first reference signal includes a sequence of communication group configurations. That is to say, different UEs in the same communication group use the same sequence when sending reference signals.
  • the first reference signal includes a sequence of network device configurations. That is to say, the network device configures the reference signal sequence for the second UE, so that the second UE uses it when sending the first reference signal.
  • the first reference signal is located after the first symbol of the first time unit.
  • the first reference signal is located on the second symbol of the first time unit, and does not affect signal transmission on the automatic gain control AGC symbol.
  • the method further includes: the first UE receives a second reference signal from the second UE at the first time unit, where the second reference signal is the same as the first reference signal, and the second reference signal On the first symbol of the first time unit.
  • the first UE performs AGC according to the second reference signal, so that the first UE can accurately receive signals of other UEs.
  • the first reference signal is located at the first symbol of the first time unit.
  • the second symbol of the first time unit may be used to transmit information carried by the physical channel, so as to improve resource utilization.
  • the first symbol of the first time unit carries the sequence of the first reference signal.
  • the first partial sequence of the first reference signal is used by the first UE to determine the received signal strength of the first reference signal, so that the first UE determines whether to perform transmission in the second time unit.
  • the second partial sequence of the first reference signal is used for the first UE to perform AGC, so that the first UE can accurately receive signals of other UEs.
  • the method before the first UE determines that the first UE performs transmission in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, the method further includes: The first UE determines the number of time units for which the received signal strength of the reference signal is greater than the third threshold.
  • the first UE determines that the first UE transmits in the second time unit, including: when the received signal strength of the reference signal is greater than the time unit of the third threshold When the number is less than the fourth threshold, the first UE determines to perform transmission in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • the first UE determines not to perform transmission in the second time unit.
  • the first UE may The transmission is performed in the second time unit, so as to prevent different UEs of the same system from continuously occupying the channel, thereby improving the possibility that communication devices of different systems successfully occupy the channel.
  • the time units in which the received signal strength of the reference signal is greater than the third threshold are continuous in the time domain. That is to say, other UEs in the same system continue to occupy the channel before the second time unit.
  • the fourth threshold is preconfigured. That is to say, the fourth threshold is a parameter configured by the first UE when it leaves the factory. In this case, when different UEs in the same system determine whether to transmit in the second time unit, the same threshold, that is, the fourth threshold, is used for judgment.
  • the fourth threshold is configured by the communication group. That is to say, different UEs in the same communication group use the same threshold, that is, the fourth threshold, to make judgments when determining whether to transmit in the second time unit.
  • the fourth threshold is configured by the network device. That is to say, the network device configures the fourth threshold for the first UE, so that the first UE uses it when determining whether to transmit in the second time unit.
  • the fourth threshold is determined based on the maximum channel occupation time COT of the second UE, where the maximum COT of the second UE is associated with the first reference signal sent by the second UE.
  • the first UE can select a UE from the UEs that continue to occupy the channel as the second UE, and use the maximum COT of the second UE as the fourth threshold to determine whether the first UE is in the second time unit It is used during transmission to make the value of the fourth threshold more flexible.
  • the method further includes: the first UE receives first indication information from the second UE, where the first indication information indicates at least one of a maximum COT and a remaining COT of the second UE.
  • the first UE determines, according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, that the first UE performs transmission in the second time unit, including: the first UE according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • the received signal strength of at least one sub-time unit, and the first indication information determine that the first UE transmits in a second time unit, wherein the second time unit belongs to a time unit in the remaining COT of the second UE, so as to limit the second time unit
  • the total duration of channel occupation by the first UE and the second UE prevents different UEs of the same system from continuously occupying the channel, thereby increasing the probability that communication devices of different systems successfully occupy the channel.
  • the method further includes: the first UE receives second indication information from the second UE, where the second indication information indicates the channel access type of the first UE before the second time unit, or , the second indication information instructs the first UE to share the COT of the second UE, so that the first UE accesses the channel based on the channel access type indicated by the second indication information.
  • the method further includes: the first UE sends a third reference signal on a third resource, where the third resource is after at least one sub-time unit and before the second time unit, and the third The reference signal is used to instruct the first UE to transmit in the second time unit, so as to prevent communication devices of different systems from preempting the second time unit, and also enable other UEs of the same system to measure the received signal strength of the same system, so as to prevent other UEs of the same system from The UE preempts the second time unit, or enables the same-system UE to distinguish between same-system interference and inter-system interference.
  • a communication device which may be the first UE in the first aspect or any possible design of the first aspect, or a chip that implements the functions of the first UE above; the communication device includes To realize the corresponding modules, units, or means (means) of the above method, the modules, units, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes a processing unit, a sending unit and a receiving unit.
  • the receiving unit is configured to receive the first reference signal from the second UE in the first time unit.
  • the receiving unit is further configured to detect received signal strength in at least one sub-time unit.
  • a processing unit configured to determine that the sending unit transmits in a second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • the receiving unit configured to detect received signal strength on at least one sub-time unit, includes: detecting received signal strength on a first sub-time unit, at least one sub-time unit including the first sub-time unit , the first sub-time unit is a sub-time unit in which the second UE sends a signal on the first time unit, and/or, the received signal strength is detected on the second sub-time unit, at least one sub-time unit includes the second sub-time unit , the second sub-time unit is a sub-time unit in which the second UE does not send a signal.
  • the processing unit is configured to determine that the sending unit transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: according to the first reference The received signal strength of the signal and the received signal strength of at least one sub-time unit determine the busy status of each sub-time unit in the at least one sub-time unit, when the number of sub-time units in the idle state in the at least one sub-time unit is greater than or equal to When N1, the sending unit is controlled to transmit in the second time unit, where N1 is a positive integer randomly generated by the communication device.
  • the processing unit is configured to determine that the sending unit transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: according to the first reference The received signal strength of the signal and the received signal strength of at least one sub-time unit determine the busy status of each sub-time unit in the at least one sub-time unit, when the number of sub-time units in the idle state in the at least one sub-time unit is greater than or equal to When N2, control the sending unit to transmit in the second time unit, where N2 is a predefined positive integer.
  • the processing unit is configured to determine the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including : When the first intensity is less than the first threshold, determine that the first sub-time unit is in an idle state; when the first intensity is greater than or equal to the first threshold, determine that the first sub-time unit is in a busy state, wherein the first intensity is the first The difference between the received signal strength of a sub-time unit and the received signal strength of the first reference signal.
  • the processing unit is configured to determine the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including : When the second intensity is less than the first threshold, determine that the second sub-time unit is in an idle state; when the second intensity is greater than or equal to the first threshold, determine that the second sub-time unit is in a busy state, wherein at least one sub-time unit It also includes a second sub-time unit, and the second strength is the received signal strength of the second sub-time unit.
  • the processing unit is configured to determine the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including : When the second intensity is less than the sixth threshold, determine that the second sub-time unit is in an idle state, and when the second intensity is greater than or equal to the sixth threshold, determine that the second sub-time unit is in a busy state, wherein the first reference signal The received signal strength is greater than a second threshold, and the second strength is the received signal strength of the second sub-time unit.
  • the first reference signal includes a physical sidelink control channel demodulation reference signal PSCCH DMRS, or, the first reference signal includes a physical sidelink shared channel demodulation reference signal PSSCH DMRS.
  • the first reference signal includes a preconfigured sequence, or the first reference signal includes a communication group configuration sequence, or the first reference signal includes a network device configuration sequence.
  • the first reference signal is located after the first symbol of the first time unit.
  • the receiving unit is further configured to receive a second reference signal from the second UE at the first time unit, where the second reference signal is the same as the first reference signal, and the second reference signal is located at the first on the first symbol of a time unit.
  • the processing unit is further configured to perform automatic gain control AGC according to the second reference signal.
  • the first reference signal is located at the first symbol of the first time unit.
  • the first symbol of the first time unit carries the sequence of the first reference signal, where the first partial sequence of the first reference signal is used by the processing unit to determine the received signal strength of the first reference signal, the first A second partial sequence of reference signals is used by the processing unit for AGC.
  • the processing unit is further configured to determine the reference signal received signal Number of time units with intensity greater than the third threshold.
  • the processing unit is configured to determine that the sending unit transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, including: when the received signal strength of the reference signal is greater than the third threshold When the number of units is less than the fourth threshold, it is determined that the sending unit transmits in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • the time units in which the received signal strength of the reference signal is greater than the third threshold are continuous in the time domain.
  • the fourth threshold is preconfigured, or the fourth threshold is configured by the communication group, or the fourth threshold is configured by the network device, or the fourth threshold is based on the maximum The channel occupancy time COT is determined, wherein the maximum COT of the second UE is associated with the first reference signal sent by the second UE.
  • the receiving unit is further configured to receive first indication information from the second UE, where the first indication information indicates at least one of a maximum COT and a remaining COT of the second UE.
  • the processing unit is configured to determine, according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, that the sending unit transmits in the second time unit, including: according to the received signal strength of the first reference signal and at least one sub-time unit The received signal strength of the sub-time unit and the first indication information determine that the sending unit transmits in a second time unit, where the second time unit belongs to a time unit in the remaining COT of the second UE.
  • the receiving unit is further configured to receive second indication information from the second UE, where the second indication information indicates the channel access type of the communication device before the second time unit, or, the second The indication information instructs the communication device to share the COT of the second UE.
  • the sending unit is further configured to send a third reference signal on a third resource, where the third resource is after at least one sub-time unit and before the second time unit, and the third reference signal Used to instruct the communication device to transmit in the second time unit.
  • a communication device including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device performs any of the above-mentioned aspects or any of the aspects.
  • the method performed by the first UE in one possible design.
  • the communication device may be the first UE in the first aspect or any possible design of the first aspect, or a chip implementing the function of the first UE.
  • a communication device including: a processor; the processor is coupled with a memory, and is used to read and execute instructions in the memory, so that the communication device performs any or all of the above-mentioned aspects
  • the communications device may be the first UE in the first aspect or any possible design of the first aspect, or, or a chip that implements the function of the first UE.
  • a chip including a processing circuit and an input/output interface.
  • the input and output interface is used to communicate with modules other than the chip, for example, the chip may be a chip implementing the first UE function in the first aspect or any possible design of the first aspect.
  • the processing circuit is used to run computer programs or instructions to implement the method in the above first aspect or any possible design of the first aspect.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer can execute the method in any one of the above-mentioned aspects.
  • a computer program product containing instructions, which, when run on a computer, enables the computer to execute the method in any one of the above aspects.
  • a circuit system in an eighth aspect, includes a processing circuit configured to execute the method according to any one of the above aspects.
  • FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application
  • FIG. 2 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a resource selection scenario provided by an embodiment of the present application.
  • FIG. 5a is a schematic diagram of a channel access scenario provided by an embodiment of the present application.
  • FIG. 5b is a schematic diagram of another channel access scenario provided by the embodiment of the present application.
  • FIG. 6a is a schematic diagram of a sidelink communication scenario provided by an embodiment of the present application.
  • FIG. 6b is a schematic diagram of resource distribution provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a sidelink channel access method provided by an embodiment of the present application.
  • Fig. 8a is another schematic diagram of resource distribution provided by the embodiment of the present application.
  • FIG. 8b is another schematic diagram of resource distribution provided by the embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • Fig. 10a is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • FIG. 10b is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • Fig. 10c is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • Fig. 10d is another schematic diagram of resource distribution provided by the embodiment of the present application.
  • FIG. 10e is a schematic diagram of another channel access scenario provided by the embodiment of the present application.
  • FIG. 10f is a schematic diagram of another channel access scenario provided by the embodiment of the present application.
  • Fig. 11a is a schematic diagram of resource mapping of a reference signal provided by an embodiment of the present application.
  • FIG. 11b is a schematic diagram of resource mapping of another reference signal provided by the embodiment of the present application.
  • Fig. 11c is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • FIG. 12a is a schematic diagram of resource mapping of another reference signal provided by the embodiment of the present application.
  • FIG. 12b is a schematic diagram of resource mapping of another reference signal provided by the embodiment of the present application.
  • FIG. 13 is a schematic diagram of resource mapping of another reference signal provided by the embodiment of the present application.
  • FIG. 14 is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • Fig. 15a is a schematic flowchart of another sidelink channel access method provided by the embodiment of the present application.
  • FIG. 15b is a schematic diagram of resource mapping of another reference signal provided by the embodiment of the present application.
  • FIG. 16 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • first and second in the specification and drawings of the present application are used to distinguish different objects, or to distinguish different processes for the same object, rather than to describe a specific sequence of objects.
  • the terms “including” and “having” mentioned in the description of the present application and any variations thereof are intended to cover non-exclusive inclusion.
  • a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes other unlisted steps or units, or optionally also includes Other steps or elements inherent to the process, method, product or apparatus are included.
  • words such as “exemplary” or “for example” are used as examples, illustrations or descriptions.
  • the embodiment of the present application may be applicable to a communication system between UEs, such as a vehicle to everything (V2X) communication system and a device to device (D2D) system.
  • V2X vehicle to everything
  • D2D device to device
  • a V2X communication system is taken as an example to describe the communication system to which the embodiment of the present application is applicable.
  • the communication system includes at least two UEs, and the two UEs can directly communicate through a side link (sidelink, SL) (in Fig. 1, Fig. 2 and Fig. 3, only Two UEs are shown).
  • the communication system further includes network equipment.
  • UEs can also communicate with network devices.
  • the V2X communication system can have the following communication scenarios: communication between vehicle to vehicle (V2V), communication between vehicle to infrastructure (V2I), vehicle to application server (vehicle to network , V2N) communication, vehicle-to-pedestrian mobile terminal (vehicle to pedestrian, V2P) communication, etc.
  • V2V vehicle to vehicle
  • V2I vehicle to infrastructure
  • V2N vehicle to application server
  • V2P vehicle-to-pedestrian mobile terminal
  • UEs communicate directly through sidelinks (sidelinks, SLs), without a sending and receiving process of network equipment, and there is no uplink and downlink communication links.
  • the UE is mainly used for receiving or sending data. Specifically, it includes a device that provides voice to the user, or includes a device that provides data connectivity to the user, or includes a device that provides both voice and data connectivity to the user. Examples may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem.
  • the UE can communicate with the core network via a radio access network (radio access network, RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • radio access network radio access network
  • the UE may include terminal equipment, wireless terminal equipment, mobile terminal equipment, device-to-device communication (device-to-device, D2D) terminal equipment, V2X terminal equipment, machine-to-machine/machine-type communication (machine-to-machine/machine -type communications, M2M/MTC) terminal equipment, internet of things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station, remote station , access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user agent (user agent), or user equipment (user device), etc.
  • IoT internet of things
  • subscriber unit subscriber station
  • mobile station remote station
  • access point access point
  • AP remote terminal
  • remote terminal remote terminal
  • access terminal access terminal
  • user agent user agent
  • user device user device
  • it may include mobile phones (or "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer built-in mobile devices, and the like.
  • PCS personal communication service
  • cordless telephone cordless telephone
  • session initiation protocol session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • constrained devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, etc.
  • it includes barcodes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning system (global positioning system, GPS), laser scanners and other information sensing devices.
  • the various UEs described above if located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as vehicle-mounted terminal equipment, and the vehicle-mounted terminal equipment is also called an on-board unit (OBU). .
  • OBU on-board unit
  • the UE may further include a relay.
  • a relay any one or more of the networks.
  • all those capable of performing data communication with network devices can be regarded as UEs.
  • the device for realizing the function of the UE may be a terminal device, or may be a device capable of supporting the terminal device to realize the function, such as a chip system, and the device may be installed in the UE.
  • the system-on-a-chip may consist of chips, or may include chips and other discrete devices.
  • the UE is used as an example for realizing the functions of the UE, and the introduction is made.
  • the network device involved in the embodiment of the present application is a device deployed on a radio access network to provide a wireless communication function.
  • a network device may refer to a device that communicates with a wireless terminal through one or more cells on the air interface of the access network, where the device that implements the function of the network device may be a network device, or it may be a device that supports the network device to implement the Functional device (such as a chip in a network device).
  • the network device can perform attribute management on the air interface.
  • Network devices may also coordinate attribute management for the air interface.
  • Network equipment includes various forms of macro base stations, micro base stations (also called small stations), relay devices such as relay stations or chips of relay devices, transmission reception points (transmission reception point, TRP), evolved network nodes (evolved Node B, eNB), next-generation network node (g Node B, gNB), evolved Node B (ng evolved Node B, ng-eNB) connected to the next-generation core network, etc.
  • the network device can be a base band unit (BBU) and a remote radio unit (RRU).
  • BBU base band unit
  • RRU remote radio unit
  • the network device can be a baseband pool (BBU pool) and RRU.
  • both UEs are in the same public land mobile network (public land mobile network) , PLMN) (such as PLMN1) coverage, as shown in Figure 1; second, only one UE is within the coverage of the PLMN (such as PLMN1), and the other UE is outside the coverage of the PLMN (ie, PLMN1), as shown in Figure 2 thirdly, the two UEs are outside the coverage of the PLMN (such as PLMN1), and there is no pre-configured cell identity in the area where the two UEs are located, as shown in FIG. 3 .
  • the dotted ellipse areas in FIG. 1 , FIG. 2 and FIG. 3 all indicate the coverage of the PLMN1. Since the side link is used for communication between the two UEs, no matter whether the two UEs are within the coverage of the PLMN at the same time, they can communicate normally.
  • the communication systems shown in Figure 1, Figure 2 and Figure 3 can be applied to long term evolution (long term evolution, LTE) or advanced long term evolution (LTE Advanced, LTE-A) systems, and can also be applied to the fifth generation of mobile communications Technology (5th generation mobile networks, 5G) networks or other networks in the future, of course, can also be applied to LTE and 5G hybrid networking systems, or other systems, which are not specifically limited in this embodiment of the present application.
  • LTE long term evolution
  • LTE Advanced LTE Advanced
  • 5G fifth generation mobile communications Technology
  • 5G fifth generation mobile networks
  • the network devices and UEs in the communication system may correspond to different names, and those skilled in the art can understand that the names do not limit the devices themselves.
  • Received signal strength (received signal strength, Rss), received signal power, received signal energy
  • Received signal strength refers to the strength of the signal received by the communication device.
  • the received signal strength may be interpreted as received signal power, or the received signal strength may be interpreted as received signal energy.
  • E represents the energy of the received signal
  • t represents the time length of the received signal
  • P represents the power of the received signal.
  • received signal strength can also be described as received signal strength indicator (received signal strength indicator, RSSI).
  • RSSI received signal strength indicator
  • the received signal strength is used as an example to introduce, but the scope of protection of this application is not limited to Here, if the implementation of received signal power or received signal strength is adopted, changes or replacements within the technical scope disclosed in this application shall be covered within the protection scope of this application.
  • Reference signals reference signals, RS
  • sequence of reference signals sequence
  • the reference signal is a known signal used by a communication device receiving the reference signal to perform channel estimation or channel detection or receive signal strength measurement.
  • the reference signal includes a channel state information reference signal (channel state information reference signal, CSI-RS) or a demodulation reference signal (demodulation reference signal, DMRS).
  • CSI-RS channel state information reference signal
  • DMRS demodulation reference signal
  • the reference signal may also have other names, such as a pilot signal.
  • the reference signal is used as an example for introduction.
  • a sequence of reference signals refers to a sequence of reference signals before they are mapped to time-frequency resources, and a sequence of reference signals may include one or more elements.
  • the SL resource pool can be understood as a collection of time-frequency resources, and is used for side link communication between UEs.
  • the SL resource pool also includes code domain resources.
  • the SL resource pool includes resources for sending and receiving information carried by physical channels.
  • the physical channel includes at least one of the following: physical sidelink control channel (physical sidelink control channel, PSCCH), physical sidelink shared channel (physical sidelink shared channel, PSSCH), physical sidelink discovery channel (physical sidelink discovery channel, PSDCH) ), physical sidelink feedback channel (physical sidelink feedback channel, PSFCH) and physical sidelink broadcast channel (physical sidelink broadcast channel, PSBCH).
  • Sidelink control information can be carried in the PSCCH and sent; or, the SCI can be divided into two levels of SCI, wherein the first level of SCI is carried in the PSCCH, and the second level of SCI is carried in the PSSCH.
  • the PSSCH is used to carry data channel information, such as at least one of second-level SCI (2nd-stage SCI), data information, and side channel state information (channel state information, CSI) feedback information.
  • PSDCH is used to carry discovery messages.
  • PSFCH is used to carry sidelink feedback information.
  • the PSBCH is used to carry information related to sidelink synchronization.
  • the SL resource pool includes one or more time units in the time domain.
  • one time unit may be one or several symbols, one or several time slots (slot), one or several mini-slots (mini-slot), one or several subframes, or one or several frames.
  • a time slot is taken as an example to introduce a time unit.
  • multiple time units can be continuous or discrete in time.
  • the SL resource pool includes one or more frequency domain units in the frequency domain.
  • a frequency domain unit may be one or several resource elements (resource element, RE), one or several resource blocks (resource block, RB), or one or several sub-channels (sub channel).
  • the size of the subchannel may be understood as that one subchannel includes one or more continuous (continuous) or interlaced (interlaced) RB quantities in the frequency domain.
  • one subchannel may include 10, 12, 15, 20, 25 or 50 RBs.
  • the name corresponding to the RB at the physical layer is recorded as a physical resource block (physical resource block, PRB).
  • resource selection mode 1 is also referred to as mode 1 for short
  • resource selection mode 2 is also referred to as mode 2 for short.
  • resource selection mode 1 and resource selection mode 2 are used as examples for introduction.
  • resource selection mode 1 the transmission resources of the UE are allocated by the network equipment, and the UE transmits information on the resources allocated by the network equipment.
  • the network device allocates a single transmission resource to the UE, and may also allocate periodic transmission resources to the UE.
  • the UE may determine transmission resources in a manner of sensing (sensing) + reservation (reservation), or select resources randomly, or allocate transmission resources by other UEs in the communication group.
  • sensing sensing
  • reservation reservation
  • Step 1 UE3 acquires data information to be sent.
  • UE3 has new data information arriving at or near time slot n, and needs to send data information to other UEs, trigger resource selection, that is, determine resources for data information transmission.
  • Step 2 UE3 determines a resource selection window.
  • the resource selection window is a preset duration after time slot n.
  • the start time slot of the resource selection window is marked as: n+T 1
  • the end time slot of the resource selection window is marked as: n+T 2 .
  • the value ranges of T1 and T2 can refer to related technologies, and will not be repeated here.
  • Step 3 UE3 determines a sensing window.
  • the listening window is a preset duration before time slot n, such as 1000 time slots (or 1000 ⁇ 2 ⁇ time slots).
  • nT 0 the start time slot of the listening window
  • nT proc,0 the ending time slot of the listening window
  • the value ranges of T 0 and T proc,0 can refer to related technologies, and will not be repeated here.
  • UE3 may perform step 2 first and then step 3, or may perform step 3 first and then step 2, or may perform step 2 and step 3 simultaneously, which is not limited in this embodiment of the present application.
  • Step 4 UE3 determines reserved resources in the resource selection window according to the interception result of the interception window.
  • the listening result includes at least one of the following: the first-level SCI carried in the PSCCH, the measured value of the reference signal received power (RSRP) of the PSCCH, and the measured value of the RSRP of the PSSCH corresponding to the PSCCH.
  • RSRP reference signal received power
  • FIG. 4 the resources occupied by the PSCCH are shown in the squares filled with oblique lines in FIG. 4 .
  • the PSCCH includes the PSCCH sent by UE2, the PSCCH sent by UE1, and the PSCCH sent by UE4.
  • the resource reservation may be periodic or non-periodic.
  • the first-level SCI indicates that the UE sending the first-level SCI has reserved time-frequency resources required for subsequent transmission, as shown in the grid filled squares in FIG. 4 .
  • the reserved resources include the reserved resources of UE2, the reserved resources of UE1, and the reserved resources of UE4.
  • all the time-frequency resources within the resource selection window form a candidate resource set S_A, and the number of resources in the candidate resource set S_A is A.
  • UE3 will The reserved resource is excluded from the set of candidate resources S_A.
  • the RSRP measurement values of the PSCCHs sent by the above three UEs ie UE2, UE1 and UE4
  • UE3 will reserve resources of the above three UEs (ie UE2, UE1 and UE4) Excluded from candidate resource set S_A.
  • UE3 excludes the reserved resources from the set of candidate resources S_A.
  • the number of remaining resources in the candidate resource set S_A is equal to B. If the remaining B resources in the candidate resource set S_A are less than X% of the total resources in the resource selection window, UE3 increases the above RSRP threshold, for example, by 3dB, until the remaining resources in the candidate resource set S_A are greater than or equal to the total resources in the resource selection window X% of. Wherein, the value of X% is configured by the resource pool. Wherein, UE3 determines reserved resources from the remaining resources in the candidate resource set S_A.
  • Step 5 UE3 sends data information on reserved resources.
  • reserving resources may be understood as that a certain UE (such as UE3) reserves some subsequent time-frequency resources.
  • the UE may send and receive data information on the reserved resource, or the UE may not use the reserved resource, that is, the reserved resource is not used by the UE.
  • reserving resources refers to resources that the UE needs to transmit signals.
  • the resource reservation may be understood as the transmission resource of the UE.
  • the same system refers to communication systems using the same radio access technology (RAT).
  • RAT radio access technology
  • Different systems refer to communication systems using different RATs.
  • the first UE is a UE in the sidelink communication system.
  • the same system refers to the sidelink in unlicensed spectrum (SL-U) system
  • the different system refers to the non-SL-U system, such as the new air interface Unlicensed spectrum (new radio in unlicensed spectrum, NR-U) system, wireless local area network (wireless fidelity, WiFi) system, etc.
  • SL-U sidelink in unlicensed spectrum
  • NR-U new air interface Unlicensed spectrum
  • WiFi wireless local area network
  • SL-U a communication system that performs SL communication in an unlicensed frequency spectrum
  • NR-U The communication system for 5G communication in unlicensed spectrum
  • the listen before talk (LBT) mechanism is commonly used to achieve fair competition for resources.
  • This mechanism requires communication devices to monitor the channel before using unlicensed spectrum resources to send data information, and perform idle channel assessment. (clear channel assessment, CCA) detection to ensure that the signal can only be transmitted when the channel is idle.
  • CCA central channel assessment
  • the UE detects that the channel is idle through the CCA, which may also be called LBT success.
  • the UE detects that the channel is busy through CCA, it may also be called LBT failure.
  • Type 1 (Type 1) channel access process
  • the UE When the UE performs the Type 1 channel access process, it needs to perform a random backoff (Backoff), that is, it needs to sense a random number of idle sensing slots (sensing slots) before sending a signal.
  • Backoff a random backoff
  • the UE Before sending a signal, the UE needs to determine that the sensing slots within a defer duration are all idle. Among them, the delay time satisfies:
  • T d represents the length of the delay time
  • T f represents the duration of the duration, such as 16us
  • T sl represents the duration of the sensing time slot, such as 9us
  • m p represents the number of sensing time slots
  • the value of m p is the same as that of the UE Related to business priorities. If all sensing slots within the delay time T d are idle, the UE enters a random backoff state.
  • the UE's initial random backoff counter is 3, it can only access the channel after sensing that all sensing time slots are idle for a delay time and then sensing that 3 sensing time slots are idle. for signal transmission. For example, after entering the random backoff state, the random backoff counter is decremented by 1 every time it senses that the sensing time is idle, until the random backoff counter is 0, the UE can access the channel and complete the LBT process.
  • the initial random backoff counter of the UE is 6, it enters the random backoff state after sensing that all sensing slots are idle for a delay time. After the UE perceives that a sensing time slot is idle, the value of the random backoff counter is reduced to 5. Afterwards, the UE perceives that the channel is busy. The UE needs to re-enter the random back-off state after sensing that all sensing slots are idle for a delay time. In this case, the random backoff counter is decremented from 5 by 1 until the random backoff counter is 0, the UE can access the channel and complete the LBT process.
  • the channel occupancy time (channel occupancy time, COT) should not exceed T mcot,p .
  • T mcot,p is a parameter related to the service priority of the UE.
  • the initiating device can share resources in the COT with one or more responding devices. These responding devices do not need to perform the Type 1 channel access process before accessing the channel, but only need to perform the Type 2 channel access process.
  • the initiating device may be a network device, and the responding device may be a UE served by the network device; or, the initiating device may be a UE, and the responding device may be a network device accessed by the UE.
  • the UE that has executed the above Type 1 channel access procedure may be referred to as an initiating device.
  • the Type 2 channel access process includes the Type 2A channel access process, Type 2B channel access process and Type 2C channel access process.
  • the sensing time should be greater than or equal to 25us; in the process of Type 2B channel access, the sensing time should be greater than or equal to 16us; in the process of Type 2C channel access, sensing is not required, but transmission The time should not exceed 584us.
  • Type 1 channel access process and Type 2 channel access process when the UE determines whether each sensing time slot is idle, energy measurement is performed with a granularity of 20MHz bandwidth. If the measured total energy does not exceed the first threshold, it may be considered that the sensing time slot is idle, otherwise it may be considered not idle.
  • the UE In the SL-U system, in order to meet the requirements of unlicensed spectrum regulations, the UE needs to perform LBT before accessing the channel. However, in the SL-U system, the UE can avoid the interference of other UEs in the same system by reserving resources, and LBT can also avoid the interference of other UEs in the same system and the interference of communication equipment in different systems. Interference, if the LBT mechanism in the NR-U system is directly used in the SL-U system, it may be that other UEs in the same system occupy the channel, resulting in LBT failure, unable to occupy adjacent time slots with other UEs in the same system, and the resource utilization rate is low. Low. Below, a detailed introduction will be made in conjunction with Fig. 6a and Fig. 6b:
  • Fig. 6a shows an information exchange process among UE1, UE2 and UE3.
  • the signal energy detected by UE3 is introduced as follows: the signal energy between UE1 and UE2 is less than the threshold, the signal energy between UE1 and UE3 is greater than the threshold, and the signal energy between UE2 and UE3 is greater than the threshold.
  • UE3 excludes the reserved resources of UE1 and UE2 through the resource selection mechanism, and the reserved resources finally determined by UE3 are shown in Figure 6b. That is to say, UE3 selects resources through a resource selection mechanism to avoid interference to itself by other UEs in the same system.
  • the reserved resources of UE3 are different from the reserved resources of UE1 and UE2.
  • the reserved resource of UE1 and the reserved resource of UE2 are earlier than the reserved resource of UE3.
  • the reserved resource of UE1 is adjacent to the reserved resource of UE3 in the time domain.
  • UE3 For UE3, UE3 performs the Type1 channel access process before its own resource reservation. For example, when performing the Type1 channel access process on the time slot where UE1's reserved resource is located, since UE1 performs data transmission in the previous time slot, UE3 Unable to perform random rollback, resulting in unusable reserved resources and low resource utilization.
  • an embodiment of the present application provides a sidelink channel access method, and the sidelink channel access method in the embodiment of the present application is applied to the communication system in FIG. 1 , FIG. 2 or FIG. 3 .
  • the first UE receives the first reference signal from the second UE in the first time unit, and the first UE detects the received signal strength in at least one sub-time unit, The first UE determines, according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, that the first UE performs transmission in the second time unit.
  • the received signal strength of the first reference signal represents the received signal strength of the communication system where the first UE is located, so as to eliminate interference to itself from other UEs in the communication system where the first UE is located.
  • the received signal strength of at least one sub-time unit can not only represent the interference of other UEs in the communication system where the first UE is located, but also can represent the interference in other communication systems (which can be called different systems) except the communication system where the first UE is located.
  • the communication equipment interferes with itself.
  • the first UE not only takes into account the received signal strength of the communication system where it is located, but also takes into account the received signal strength of at least one sub-time unit to determine whether at least one sub-time unit is occupied by a communication device in another communication system, and then determines that it can No to transmit on the second time unit. In this way, even if other UEs in the same system occupy the channel before the second time unit, the first UE can occupy the channel with other UEs in the same system in a time-division multiplexing manner, thereby improving resource utilization.
  • a sidelink channel access method 700 proposed in the embodiment of the present application is introduced in detail.
  • a time unit may include a certain number of symbols, time slots, subframes, frames, etc.
  • time slots are taken as an example to introduce the time unit.
  • a time unit may also have other names, such as a time domain unit.
  • the time unit is used as an example for introduction, and a unified description is given here, and details will not be described later.
  • a sub-time unit may include a certain number of sensing slots.
  • the sub-time unit is introduced by taking the sensing time slot as an example.
  • the second UE sends a first reference signal in a first time unit.
  • the first UE receives the first reference signal from the second UE in the first time unit.
  • the first UE and the second UE belong to the same communication system, such as the SL-U communication system.
  • the first UE may be UE3, and the second UE may be UE1.
  • the first time unit is the first time slot.
  • the first reference signal please refer to the introduction of FIG. 11a, FIG. 11b, FIG. 11c, FIG. 12a, FIG. 12b and FIG.
  • the first UE detects received signal strength in at least one sub-time unit.
  • Each sub-time unit may include a sensing slot.
  • the first sub-time unit refers to the sub-time unit in which the second UE sends a signal on the first time unit, for example, the first sub-time unit is located in other symbols except the interval (gap, GAP) symbol in the first time unit , for example, the symbols between the second symbol and the thirteenth symbol in the first time unit.
  • the second sub-time unit refers to a sub-time unit that does not send signals to other UEs in the same system, for example, the second sub-time unit is located in the GAP symbol of the first time unit; or, the second sub-time unit is located in other time units ( In GAP symbols of other time units except the first time unit); or, the second sub-time unit is located in other symbols (or may be referred to as non-GAP symbols) of the first time unit except for the GAP symbols.
  • the non-GAP symbol where the second sub-time unit is located is recorded as the target symbol.
  • the target symbol satisfies the following condition: the second UE does not send a signal on the target symbol.
  • the first UE although the first UE can receive the first reference signal of the second UE, it does not receive the signal of the second UE on the target symbol of the first time unit.
  • each UE does not send a signal on the GAP symbol, and the GAP symbol can be used for the UE to perform transceiving conversion.
  • S702 includes S702a, but does not include S702b, as shown in the dotted box in Example 1 in Figure 9; or, S702 includes S702b, but does not include S702a , as shown in the dashed box of Example 2 in FIG. 9 ; or, S702 includes S702a and S702b , as shown in the dashed box of Example 3 in FIG. 9 .
  • the introduction of S702a and S702b is as follows:
  • the first UE detects received signal strength in the first sub-time unit.
  • the number of the first sub-time units may be one or more.
  • Each first sub-time unit may be a sensing time slot.
  • the first sub-time unit may be located in a non-GAP symbol of the first time unit. That is, the first UE detects the received signal strength on the sensing slots in the non-GAP symbols of the first time unit.
  • the first UE detects the received signal strength in the second sub-time unit.
  • the number of second sub-time units may be one or more.
  • Each second sub-time unit may be a sensing time slot.
  • the second sub-time unit may be located in the GAP symbol of the first time unit. That is, the first UE detects the received signal strength on the sensing slot in the GAP symbol of the first time unit.
  • the second sub-time unit may be located in the GAP symbols of other time units (time units other than the first time unit). That is to say, the first UE detects the received signal strength on the sensing slots in the GAP symbols of other time units (other time units than the first time unit).
  • the second sub-time unit may be located in the non-GAP symbol (such as the symbol with index a) of the first time unit, such as the above-mentioned target symbol. That is to say, the first UE detects the received signal strength on the sensing time slot in the non-GAP symbol (such as the above-mentioned target symbol) of the first time unit.
  • the LBT process performed by the first UE may include LBT1 or LBT4.
  • the LBT process performed by the first UE may include LBT2.
  • the LBT process performed by the first UE may include LBT3.
  • the GAP symbol in the first time unit is taken as an example to introduce the first sub-time unit, the second sub-time unit and the LBT process, which should not be interpreted as implementing the present application.
  • the second sub-time unit may also be located in a non-GAP symbol.
  • At least one sub-time unit includes the sub-time unit perceived by the first UE after entering the random back-off state, or it can be understood that the first UE is in the The sub-time unit that needs to be perceived outside the delay time.
  • the total duration of all sub-time units in at least one sub-time unit is equal to the perception duration of the first UE.
  • the first UE After the first UE determines the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit, the first UE also performs S703:
  • the first UE determines whether transmission can be performed in the second time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • the second time unit is after the first time unit of S701. Taking FIG. 8a as an example, the first UE is UE3, and the reserved resource of UE3 is in the second time slot. Correspondingly, the second time unit includes the second time slot. When the first time unit includes the first time slot, the second time unit follows the first time unit. In the embodiment of the present application, the first time unit and the second time unit may be continuous in the time domain, as shown in FIG. 8a , or may not be continuous.
  • the second time unit is after at least one sub-time unit in S702.
  • the first UE is still UE3, and the reserved resource of UE3 is in the second time slot.
  • the second time unit includes the second time slot.
  • the second time unit is after the at least one sub-time unit in S702.
  • Example 1 the implementation process of S703 is introduced through Example 1 and Example 2:
  • Example 1 as shown in the dotted box of Example 1 in FIG. 10a, S703 includes S7031 and S7032a, or, S703 includes S7031 and S7032b.
  • S7031, S7032a and S7032b are as follows:
  • the first UE determines the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • At least one sub-time unit in S7031 is consistent with at least one sub-time unit in S702, which will not be repeated here.
  • each sub-time unit in at least one sub-time unit is the first sub-time unit, that is, when S702 includes S702a but does not include S702b, for each sub-time unit in at least one sub-time unit, the implementation of S7031 The process includes:
  • the first UE determines the busy/idle state of the first sub-time unit according to the first strength, where the first strength is a difference between the received signal strength of the first sub-time unit and the received signal strength of the first reference signal.
  • the first intensity satisfies the following formula:
  • P3 represents the first strength
  • P2 represents the received signal strength of the first sub-time unit
  • P1 represents the received signal strength of the first reference signal
  • the busy state of the first sub-time unit is introduced as follows: if the first strength is less than the first threshold, the first UE determines that the first sub-time unit is in the idle state; if the first strength is greater than or equal to the first threshold, the first UE A UE determines that the first sub-time unit is in a busy state. Or, if the first strength is less than or equal to the first threshold, the first UE determines that the first sub-time unit is in an idle state; if the first strength is greater than the first threshold, the first UE determines that the first sub-time unit is in a busy state.
  • the implementation process of S7031 includes: for at least one For each first sub-time unit in the sub-time unit, the first UE determines the busy state of the first sub-time unit according to the first strength, where the first strength is the received signal strength of the first sub-time unit and the first reference For the difference between the received signal strengths of the signals, refer to the introduction of formula (2) for details, and will not be repeated here.
  • the first UE determines the busy state of the second sub-time unit according to the second strength, where the second strength is the received signal strength of the second sub-time unit, See the introduction of formula (3) for details.
  • the second intensity satisfies the following formula:
  • P3' represents the second strength
  • P2' represents the received signal strength of the second sub-time unit
  • the busy/idle state of the second sub-time unit is introduced as follows: if the second strength is less than the first threshold, the second UE determines that the second sub-time unit is in the idle state; if the second strength is greater than or equal to the first threshold, the second UE The second UE determines that the second sub-time unit is in a busy state. Alternatively, if the second strength is less than or equal to the first threshold, the second UE determines that the second sub-time unit is in an idle state; if the second strength is greater than the first threshold, the second UE determines that the second sub-time unit is in a busy state.
  • Example 1 for the first UE, after determining the busy/idle state of each sub-time unit in at least one sub-time unit, the first UE performs S7032a or S7032b:
  • the first UE transmits in the second time unit.
  • N1 is a positive integer randomly generated by the first UE.
  • the number of sub-time units in the idle state in at least one sub-time unit can be understood as the idle sub-time perceived by the first UE after entering the random back-off state number of units.
  • N1 satisfies the following formula:
  • N1 N int formula (4)
  • N1 represents the minimum value of the number of idle sub-time units perceived by the first UE after entering the random backoff state.
  • N int represents the initial value of the random backoff counter after the first UE enters the random backoff state.
  • the sub-time unit in the idle state may include the following three situations:
  • the sub-time units in the idle state are all the first sub-time units.
  • the sub-time units in the idle state are all the second sub-time units.
  • the sub-time units in the idle state include a certain number of first sub-time units and a certain number of second sub-time units.
  • At least one sub-time unit in S7032b is consistent with at least one sub-time unit in S7032a, which will not be repeated here.
  • the first UE executes S7032a, it can be understood that the first UE accesses the channel according to the Type1 channel access procedure, so as to perform transmission in the second time unit.
  • S703 includes S7031 and S7033a, or, S703 includes S7031 and S7033b.
  • the introduction of S7031, S7033a and S7033b is as follows:
  • the first UE determines the busy/idle state of each sub-time unit in at least one sub-time unit according to the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit.
  • each sub-time unit in at least one sub-time unit is the first sub-time unit, that is, when S702 includes S702a but does not include S702b, for each sub-time unit in the at least one sub-time unit the busy-idle status For determination, refer to the description of the formula (2), which will not be repeated here.
  • At least one sub-time unit includes both a certain number of first sub-time units and a certain number of second sub-time units, that is, when S702 includes both S702a and S702b, for at least one sub-time unit
  • For the determination of the busy state of the first sub-time unit refer to the description of formula (2)
  • for the determination of the busy state of the second sub-time unit in at least one sub-time unit refer to the description of formula (3), where No longer.
  • each sub-time unit in at least one sub-time unit is the second sub-time unit, that is, when S702 includes S702b but does not include S702a, for each sub-time unit in at least one sub-time unit, the implementation of S7031 The process includes:
  • the first UE determines the busy/idle status of the second sub-time unit according to the second strength, where the second strength is the received signal strength of the second sub-time unit, specifically Refer to the introduction of the formula (3).
  • the second strength is the received signal strength of the second sub-time unit
  • the first UE may determine that the second UE sends information through the physical channel in the first time unit. Moreover, the receiving strength of the first reference signal is relatively high, and correspondingly, the distance between the first UE and the second UE is relatively short.
  • the resource sensing results of the first UE and the second UE are similar, and the first UE and the second UE may share a channel. For the first UE, the first UE may use the Type2 channel access procedure to perform transmission in the second time unit.
  • the first threshold and the second threshold are two different thresholds.
  • the value of the first threshold and the value of the second threshold may be the same or different, which is not limited in this embodiment of the present application.
  • the first threshold is used for the first UE to determine the busy/idle status of each sub-time unit.
  • the first UE uses the same value as the first threshold to judge the busy/idle status of each sub-time unit.
  • the value of the first threshold adopted by the first UE may be the same or different.
  • the first UE uses threshold 1 as the first threshold to determine the busy/idle status of each sub-time unit in the LBT1 process.
  • the first UE uses threshold 2 as the first threshold to determine the busy/idle status of each sub-time unit in the LBT2 process.
  • the threshold 1 and the threshold 2 both serve as the first threshold, and the values of the threshold 1 and the threshold 2 may be the same or different, which is not limited in this embodiment of the present application.
  • Example 2 for the first UE, after determining the busy/idle status of each sub-time unit in at least one sub-time unit, the first UE performs S7033a or S7033b:
  • the first UE transmits in the second time unit.
  • N2 is a predefined positive integer.
  • N2 indicates the minimum value of the number of idle sub-time units perceived by the first UE during the Type2 channel access process.
  • N2 satisfies the following formula:
  • N2 represents the minimum value of the number of idle sub-time units perceived by the first UE during the Type2 channel access process
  • T sl represents the duration of the sensing time slot
  • t represents the perception duration during the Type2 channel access process of the first UE
  • the sub-time units in the idle state may include the following situation: the sub-time units in the idle state are all the second sub-time units.
  • At least one sub-time unit in S7033b is consistent with at least one sub-time unit in S7033a, which will not be repeated here.
  • the first UE executes S7033a, it can be understood that the first UE accesses the channel according to the Type2 channel access procedure, so as to perform transmission in the second time unit.
  • the first UE may be indicated by the second UE which way the first UE uses to access the channel and perform signal transmission in the second time unit.
  • the first UE before performing S703, the first UE further performs S709:
  • the second UE sends second indication information to the first UE.
  • the first UE receives the second indication information from the second UE.
  • the second indication information indicates the channel access type of the first UE before the second time unit.
  • the channel access types include Type1 channel access and Type2 channel access.
  • the first UE determines the channel access type before the second time unit based on the channel access type indicated by the second indication information. For example, in the case that the channel access type is Type1 channel access, the first UE may adopt the introduction of Example 1 in S703. In the case that the channel access type is Type2 channel access, the first UE may adopt the introduction of Example 2 in S703.
  • S709 is an optional step.
  • the first UE When the first UE has determined the channel access type before the second time unit, if the network device is the first The UE configures the channel access type before the second time unit, and the first UE may not perform S709. Conversely, when the first UE has not determined the channel access type before the second time unit, the first UE may perform S709.
  • the second indication information indicates that the first UE shares the COT of the second UE.
  • the first UE determines that the channel access type before the second time unit is Type2 channel access.
  • the first UE determines that the channel access type before the second time unit is Type1 channel access, see the introduction of Example 1 in S703 for details.
  • the first UE may execute S701 first, and then execute S709, or execute S709 first, and then execute S701, or execute S701 and S709 at the same time, which is not limited in this embodiment of the present application. .
  • the implementation process of S703 is introduced through Example 3 and Example 4:
  • Example 3 as shown in the dotted box of Example 3 in Figure 10c, for the first UE, before the first UE performs S703, it also performs S708a:
  • the first UE determines the number of time units in which the received signal strength of the reference signal is greater than the third threshold.
  • time unit in S708a is introduced as follows:
  • the time unit in S708a is before the second time unit, and the time unit in S708a may include the first time unit.
  • the second time unit is the x+2th time slot
  • the time unit in S708a may include the time slots before the x+2th time slot.
  • the time unit in S708a may include the x+1th time slot; or, the time unit in S708a may include the x+1th time slot, the xth time slot; or, the time unit in S708a may include the th x+1 time slot, xth time slot, x-1th time slot; or, the time unit in S708a may include x+1th time slot, xth time slot, x-1th time slot slot, the x-2th slot.
  • the time unit in S708a may also include more time slots, which will not be described here one by one.
  • the reference signal in S708a may be sent by one UE, or may be sent by two or more UEs. Still taking Fig. 10d as an example, UE1 sends a reference signal in the x+1th time slot, and UE4 sends the reference signal in the xth time slot. When the time unit in S708a includes the x+1th time slot, the reference signal in S708a is sent by UE1. When the time unit in S708a includes the x+1th time slot and the xth time slot, the reference signal in S708a includes the reference signal sent by UE1 and the reference signal sent by UE4.
  • the third threshold may be an RSRP threshold, which is not limited in this embodiment of the present application.
  • S703 includes S7034a:
  • the first UE determines whether the received signal strength of the first reference signal and the received signal strength of at least one sub-time unit can be Two time units are transmitted.
  • the process of determining whether the first UE can perform transmission in the second time unit can refer to the introduction of Example 1 and Example 2 in S703, which will not be repeated here.
  • the introduction of the fourth threshold is as follows:
  • the fourth threshold is preconfigured, or the fourth threshold is configured by the communication group, or the fourth threshold is configured by the network device.
  • the preconfigured fourth threshold may be understood as that the fourth threshold is a parameter configured by the first UE when it leaves the factory.
  • the communication system where the first UE is located such as the SL-U system
  • different UEs use the same fourth threshold when performing S7034a.
  • the communication system where the first UE is located further includes a second UE, a third UE, and a fourth UE. Since each UE is configured with the same parameters when leaving the factory, the above four UEs (such as the first UE, the second UE, the third UE, and the fourth UE) use the same fourth threshold when performing S7034a.
  • the fourth threshold configured by the communication group may be understood as the fourth threshold configured by the communication group where the first UE belongs.
  • a UE in the communication group sends indication information X to other UEs in the same communication group, where the indication information X indicates the magnitude of the fourth threshold.
  • the size of the fourth threshold can be determined based on the indication information X.
  • different UEs all adopt the same fourth threshold when performing S7034a.
  • the fourth threshold used by UEs in different communication groups when performing S7034a may be the same or different, which is not limited in this embodiment of the present application.
  • the first UE and the second UE communicate with each other, and the communication group in which the first UE and the second UE belong is marked as communication group 1 .
  • the third UE and the fourth UE communicate with each other, and the communication group in which the third UE and the fourth UE belong is denoted as communication group 2 .
  • the fourth threshold used by the second UE when performing S7034a may be the same as or different from the fourth threshold used by the fourth UE when performing S7034a.
  • the fourth threshold configured by the network device.
  • the network device configures the fourth threshold for the first UE, so that the first UE can use it when performing S7034a.
  • the network device sends indication information Y to the first UE, where the indication information Y indicates the magnitude of the fourth threshold. After receiving the indication information Y, the first UE can determine the size of the fourth threshold based on the indication information Y.
  • the fourth threshold is determined based on the maximum COT of the second UE.
  • the maximum COT of the second UE is associated with the first reference signal sent by the second UE.
  • the service priority of the UE can be reflected by the sequence of the reference signal, as shown in Table 1:
  • the second UE determines the sequence of the first reference signal based on its own service priority and Table 1.
  • the maximum COT of the UE can be equal to the total duration of 3 time units. Signal transmission is carried out in time units. If the service priority of the UE is service priority 2, the maximum COT of the UE can be equal to the total duration of 6 time units, correspondingly, the UE can perform signal transmission in a maximum of 6 consecutive time units.
  • the reference signal in S708a may be sent by one UE, or may be sent by two or more UEs, see the introduction of S708a for details.
  • the first UE may select one UE from the two or more UEs according to the first preset condition or the second preset condition as the second UE .
  • the first preset condition includes at least one of the following:
  • the preset condition a1 is that the COT of the second UE is greater than the COT of the third UE.
  • the third UE and the first UE belong to the same communication system.
  • the first UE may be UE3.
  • the second UE may be UE1, and the third UE may be UE4.
  • the second UE may be UE4, and the third UE may be UE1.
  • the first UE, the second UE and the third UE all belong to UEs in the SL-U system.
  • the COT in the preset condition a1 can be replaced by the maximum COT.
  • the preset condition a1 is replaced with the preset condition a11, that is, the maximum COT of the second UE is greater than the maximum COT of the third UE.
  • the reference signal in S708a is sent by two or more UEs, and the maximum COTs of different UEs may be the same or different.
  • the preset condition a11 means that the first UE uses the maximum COT as a selection criterion, and selects a UE with a larger maximum COT from multiple UEs as the second UE. Exemplary, as shown in Table 2:
  • the maximum COT of UE1 is equal to the total duration of 6 time units, and the maximum COT of UE4 is equal to the total duration of 3 time units. In this case, the first UE Use UE1 as the second UE.
  • the COT in the preset condition a1 can also be replaced with the remaining COT.
  • the preset condition a1 is replaced with the preset condition a12, that is, the remaining COT of the second UE is greater than the remaining COT of the third UE.
  • the reference signal in S708a is sent by two or more UEs, and the remaining COTs of different UEs may be the same or different.
  • the preset condition a12 it means that the first UE uses the remaining COT as a selection criterion, and selects a UE with a larger remaining COT from multiple UEs as the second UE.
  • the remaining COT of UE1 is equal to the duration of 1 time unit
  • the remaining COT of UE4 is equal to the duration of 2 time units.
  • the first UE A UE uses UE4 as the second UE.
  • the preset condition a2 is that the service priority of the second UE is lower than the service priority of the first UE.
  • the first UE can learn its own service priority.
  • the first UE can determine the service priority of the UE based on the above Table 1 and the reference signal in S708a. For example, still taking Table 2 as an example, when the service priorities of UE1 and UE4 are both lower than the service priority of the first UE, the first UE can combine the preset condition a1 to select a UE from UE1 and UE4 as Second UE.
  • the first UE may use UE1 as the second UE.
  • the service priority of UE4 is lower than that of the first UE and the service priority of UE1 is higher than that of the first UE, the first UE may use UE4 as the second UE.
  • the first preset condition may include the preset condition a1, but not include the preset condition a2.
  • the first UE selects the second UE by using the COT as a selection criterion.
  • the first preset condition may also include a preset condition a1 and a preset condition a2.
  • the first UE selects the second UE based on COT and service priority as selection criteria.
  • the first preset condition may not include the preset condition a1, but include the preset condition a2.
  • the first UE selects the second UE by using service priority as a selection criterion.
  • the second preset condition includes: the time unit in which the second UE sends the reference signal is continuous in the time domain with the second time unit.
  • the first UE may be UE3.
  • the second UE may be UE1, and the third UE may be UE4.
  • the second UE may be UE4, and the third UE may be UE1.
  • the first UE, the second UE and the third UE all belong to UEs in the SL-U system.
  • UE1 sends the reference signal in the xth time slot
  • UE4 sends the reference signal in the x-1th time slot. Therefore, the first UE uses UE1 as the second UE based on the second preset condition.
  • the COT of the first UE when the first UE determines to transmit in the second time unit, the COT of the first UE is introduced as follows: the COT of the first UE may be determined based on the fourth threshold. For example, the COT of the first UE satisfies the following formula:
  • COT1 represents the COT of the first UE
  • M represents the fourth threshold
  • N represents the number of time units for which the received signal strength of the reference signal is greater than the third threshold
  • T s represents the duration of one time slot.
  • the maximum COT of the second UE is equal to the duration of M time slots.
  • the fourth threshold is M.
  • the second UE has occupied N time slots. It can be understood that the number of time units in which the received signal strength of the reference signal is greater than the third threshold is N.
  • the remaining (M-N) time slots are not occupied, it can be understood that the number of time units in which the received signal strength of the reference signal is greater than the third threshold is less than the fourth threshold.
  • the second time unit may be the N+1th time slot.
  • the first UE accesses The channel performs signal transmission on the N+1th time slot, and the duration that the first UE can continuously occupy the channel may be at most (M-N) time slots.
  • M the number of time units for which the received signal strength of the reference signal is greater than the third threshold is equal to the fourth threshold.
  • the second time unit may be the N+1th time slot.
  • the first UE does not perform signal transmission on the N+1 time slot, that is, the first UE does not access the channel, so as to improve the possibility that communication devices of different systems successfully seize transmission resources.
  • the number of time units in which the received signal strength of the reference signal is greater than the third threshold is continuous in the time domain. It means that before the second time unit, other UEs in the communication system where the first UE is located continuously occupy the transmission resources.
  • the COT represents the duration that the UE can occupy the channel.
  • the unit of COT can be us or ms or s, etc.
  • the COT of a certain UE can be equal to the total length of a certain number of continuous time slots, or a part of the time length of a certain time slot, or the sum of the total length of a certain number of continuous time slots and a part of the time length of a certain time slot .
  • “COT is equal to a certain number of continuous time slot durations” is used as an example for introduction, which should not be construed as a limitation to the embodiment of the present application.
  • Example 4 as shown in the dotted box of Example 4 in Figure 10c, for the first UE, before performing S703, the first UE also performs S708b:
  • the second UE sends the first indication information to the first UE.
  • the first UE receives the first indication information from the second UE.
  • the first indication information indicates at least one of the maximum COT and the remaining COT of the second UE.
  • the first indication information indicates that the maximum COT of the second UE is equal to the duration of 6 time units, and/or, the first indication information indicates that the second UE The remaining COT of the second UE is equal to the duration of 1 time unit.
  • the first indication information may directly indicate the maximum COT of the second UE, or may indirectly indicate the maximum COT of the second UE, which is not limited in this embodiment of the present application.
  • the first indication information may directly indicate the remaining COT of the second UE, or may indirectly indicate the remaining COT of the second UE, which is not limited in this embodiment of the present application.
  • S703 includes S7034b:
  • the first UE determines whether transmission can be performed in the second time unit according to the received signal strength of the first reference signal, the received signal strength of at least one sub-time unit, and the first indication information.
  • the first UE may determine based on the number of first time units where the first reference signal is located, the position of the first time unit, and the maximum COT of the second UE Whether the second time unit is in the remaining COT of the second UE, if yes, the first UE performs the channel access procedure of example 1 or example 2, to determine whether signal transmission can be performed on the second time unit, if not, Then the first UE does not perform signal transmission in the second time unit.
  • the first UE may, based on the number of first time units where the first reference signal is located, the position of the first time unit, and the remaining COT of the second UE, Determine whether the second time unit can be in the remaining COT of the second UE, if yes, then the first UE performs the channel access process of example 1 or example 2, to determine whether signal transmission can be performed on the second time unit, if no , the first UE does not perform signal transmission in the second time unit.
  • the maximum COT of the second UE is equal to the duration of M time slots.
  • the second UE has occupied N time slots, which can be understood as that the number of first time units is N.
  • the remaining (M-N) time slots are not occupied, it can be understood that the remaining COT of the second UE is equal to the duration of the (M-N) time slots.
  • the second time unit may be the N+1th time slot, which belongs to one of the remaining (M-N) time slots of the second UE.
  • the first UE accesses The channel performs signal transmission on the N+1th time slot, and the duration that the first UE can continuously occupy the channel may be at most (M-N) time slots.
  • the second time unit may be the N+1th time slot, which does not belong to the remaining COT of the second UE.
  • the first UE A UE does not perform signal transmission on the N+1 time slot, that is, the first UE does not access the channel, so as to increase the possibility that communication devices of different systems successfully seize transmission resources.
  • the first time unit carrying the first reference signal and the second time unit may or may not be adjacent in the time domain, which is not limited in this embodiment of the present application.
  • the first reference signal includes one of the following:
  • the pre-configured sequence may refer to that the sequence is configured by the first UE when it leaves the factory.
  • the communication system where the first UE is located such as the SL-U system
  • different UEs use the same sequence when sending reference signals.
  • the communication system where the first UE is located further includes a second UE, a third UE, and a fourth UE. Since each UE is configured with the same parameters when leaving the factory, the above four UEs (such as the first UE, the second UE, the third UE, and the fourth UE) adopt the same sequence when sending reference signals.
  • the second item the sequence of communication group configurations.
  • the sequence of communication group configurations may refer to the sequence of communication group configurations where the first UE belongs.
  • a UE in the communication group sends indication information M to other UEs in the same communication group, where the indication information M indicates the sequence of the reference signal.
  • the sequence of the first reference signal can be determined based on the indication information M.
  • different UEs all use the same sequence when sending the reference signal.
  • the sequences used by UEs in different communication groups when sending reference signals may be the same or different, which is not limited in this embodiment of the present application.
  • the first UE and the second UE communicate with each other, and the communication group in which the first UE and the second UE belong is marked as communication group 1 .
  • the third UE and the fourth UE communicate with each other, and the communication group in which the third UE and the fourth UE belong is denoted as communication group 2 .
  • the sequence used by the second UE when sending the reference signal may be the same as or different from the sequence used by the fourth UE when sending the reference signal.
  • the third item is the sequence of network device configuration.
  • the network device configures the sequence for the second UE, so that the second UE uses it when sending the first reference signal.
  • the network device sends indication information N to the first UE, where the indication information N indicates the sequence of the reference signal. After receiving the indication information N, the second UE can determine the sequence of the first reference signal based on the indication information N.
  • sequences in the above three items may include time domain sequences or frequency domain sequences, which is not limited in this embodiment of the present application.
  • the first reference signal in S701 is introduced in detail through Example 1 and Example 2:
  • Example 1 the first reference signal is located after the first symbol of the first time unit.
  • the first symbol is an automatic gain control (AGC) symbol.
  • AGC automatic gain control
  • the first reference signal is located after the AGC symbol of the first time unit, such as the first symbol after the AGC symbol.
  • the sequence of the first reference signal may include a frequency domain sequence or a time domain sequence.
  • the first reference signal comprises a time domain sequence
  • the first reference signal occupies the full bandwidth.
  • the full bandwidth may be a 20 MHz bandwidth.
  • the first reference signal may occupy all sub-channels in the full bandwidth.
  • the first reference signal occupies the full bandwidth.
  • the subchannel occupied by the first reference signal is the same as the subchannel occupied by the physical channel.
  • the subchannel occupied by the physical channel is recorded as the first subchannel.
  • the first subchannel is a partial subchannel in the full bandwidth, for example, the first subchannel may be one or more subchannels.
  • Physical channels include at least one of PSSCH and PSCCH.
  • the PSSCH is taken as an example to introduce the first subchannel. Referring to Fig. 11b, the PSSCH occupies the jth subchannel.
  • the j-th sub-channel is the above-mentioned first sub-channel.
  • the PSSCH occupies N PRBs.
  • the first reference signal also occupies the jth subchannel.
  • the signal transmission strength of the second UE on each symbol may be the same. This means that the signal transmission strength on the AGC symbol is the same as the signal transmission strength of the first reference signal.
  • the second UE also performs S704:
  • the second UE sends the second reference signal in the first time unit.
  • the first UE receives the second reference signal from the second UE in the first time unit.
  • the second reference signal is the same as the first reference signal, and the second reference signal is located on the first symbol of the first time unit. It can be understood that the first symbol transmission content of the first time unit is the same as the second symbol transmission content of the first time unit. Wherein, the second reference signal carried by the first symbol of the first time unit is used for the UE receiving the second reference signal to perform AGC.
  • the first UE performs AGC according to the received signal on the first symbol of the first time unit.
  • the signal received by the first UE on the first symbol of the first time unit includes at least the second reference signal.
  • the signal received by the first UE in the first symbol of the first time unit also includes the signal sent by the third UE.
  • the first UE adjusts the amplification factor of its own receiver according to the received signal strength of the received signal of the first symbol of the first time unit, so as to ensure that it can correctly receive signals of other UEs.
  • Example 2 the first reference signal is located in the first symbol of the first time unit.
  • the first reference signal is located on the AGC symbols.
  • the sequence of the first reference signal may include a frequency domain sequence, or may include a time domain sequence.
  • the first symbol of the first time unit carries K repeated time domain sequences.
  • K is a positive integer, K ⁇ 2.
  • the first partial sequence in the K repeated time domain sequences is used for the first UE to determine the received signal strength of the first reference signal.
  • the second part of the K repeated time domain sequences is used for AGC by the first UE.
  • the first UE performs AGC according to the second part of the sequence to adjust the amplification factor of its own receiver, so as to ensure that it can correctly receive Signals from other UEs.
  • the first partial sequence is different from the second partial sequence.
  • the first partial sequence follows the second partial sequence.
  • the introduction of the first part sequence and the second part sequence is as follows:
  • the first partial sequence includes K1 time-domain sequences among the K repeated time-domain sequences, where K1 is a positive integer smaller than K.
  • the second partial sequence includes K2 time domain sequences among the K repeated time domain sequences, where K2 is a positive integer smaller than K.
  • the first partial sequence includes K1 time-domain sequences among the K repeated time-domain sequences, where K1 is a positive integer smaller than K.
  • the second partial sequence includes K2 time domain sequences among the K repeated time domain sequences, where K2 is a positive integer smaller than K.
  • the first partial sequence includes K1 time-domain sequences in the K repeated time-domain sequences, and a part of the sequence in the first time-domain sequence (or, described as, a part of elements in the first time-domain sequence), where , K1 is a positive integer less than K.
  • the second partial sequence includes K2 time-domain sequences among the K repeated time-domain sequences, and another partial sequence (or, described as, another part of elements in the first time-domain sequence) of the first time-domain sequence. Wherein, K2 is a positive integer smaller than K.
  • the K repeated time-domain sequences include the aforementioned K1 time-domain sequences, K2 time-domain sequences and the first time-domain sequence.
  • the bandwidth of the first reference signal may refer to the introduction of the time-domain sequence in Example 1, which will not be repeated here.
  • Example 2 when the first reference signal includes a frequency domain sequence, the first reference signal occupies 1 sub-frequency domain unit in every L sub-frequency domain units in the frequency domain.
  • the sub-frequency domain unit may be RE, PRB, sub-channel, etc.
  • the sub-frequency domain unit is RE as an example for introduction. That is to say, the second UE sends the first reference signal in a manner of L comb teeth in the frequency domain.
  • FIG. 12b shows a schematic diagram of resource mapping of 2 combs in the frequency domain.
  • two adjacent elements in the frequency domain sequence of the first reference signal are separated by 2 sub-frequency domain units in the frequency domain.
  • the time domain sequence of the first reference signal is obtained.
  • the time domain sequence of the first reference signal is two repeated time domain sequences, as shown in Fig. 12b.
  • the bandwidth of the first reference signal can refer to the introduction of the frequency-domain sequence in Example 1, which will not be repeated here.
  • the second UE sends the signal strength of the first reference signal in one symbol, which satisfies the following formula:
  • P RS represents the transmitted signal strength of the first reference signal on a single symbol
  • P PS represents the transmitted signal strength of the information carried by the physical channel on a single symbol
  • X represents a multiple, X>0.
  • the value of X is 1, or the value of X is a value greater than 1.
  • Example 2 the second symbol in a time slot can be used to send information carried by the physical channel, so as to improve resource utilization.
  • the first UE may directly combine the received signal (that is, the first reference signal received by the first UE) with the locally stored first reference signal
  • the time-domain sequence performs a time-domain correlation operation to calculate the received signal strength of the first reference signal. If the sequence of the first reference signal is a sequence in the frequency domain, the first UE first transforms the received signal (that is, the first reference signal received by the first UE) from the time domain to the frequency domain. If the signal occupies all sub-channels, frequency-domain correlation operations are performed on all sub-channels to calculate the received signal strength of the first reference signal.
  • the first reference signal converted to the frequency domain occupies part of the sub-channels (such as the first sub-channel) , then perform a frequency domain correlation operation on the corresponding sub-channel to calculate the received signal strength of the first reference signal.
  • a frequency domain correlation operation on the corresponding sub-channel to calculate the received signal strength of the first reference signal.
  • the received signal strength of the first reference signal refers to the received signal strength in the time domain.
  • the first UE transforms the received signal (that is, the first reference signal received by the first UE) from the time domain to the frequency domain, and after the frequency domain correlation operation, the calculated first reference signal
  • the received signal strength satisfies the following formula:
  • P1 represents the received signal strength of the first reference signal
  • P RS represents the transmitted signal strength of the first reference signal on a single symbol
  • X represents a multiple
  • X can refer to the introduction of formula (7), and will not be repeated here.
  • the first reference signal includes at least one of the following:
  • the first item PSCCH DMRS.
  • the PSCCH occupies 10 PRBs
  • the PSCCH occupies the second to fourth symbols of a time slot.
  • the PSCCH DMRS occupies part of the 10 PRBs.
  • PSSCH DMRS The second item, PSSCH DMRS.
  • the PSSCH occupies the full bandwidth
  • the PSSCH occupies the second to fourth symbols of a time slot, and the sixth to tenth symbols , the twelfth symbol to the thirteenth symbol.
  • PSCCH DMRS occupies the fifth symbol and the eleventh symbol of a slot.
  • FIG. 13 is an example of a configuration mode, which should not be construed as a limitation to the embodiment of the present application.
  • the UE in the communication system where the first UE is located sends a reference signal before sending the PSCCH. Based on this, the UE that receives the reference signal can also reduce the blind detection power consumption of its own PSCCH. Exemplarily, as shown in FIG. 14, taking the first UE as the UE receiving the reference signal as an example, the first UE also performs S706 and S707:
  • the third UE sends the third reference signal in the fourth time unit.
  • the first UE receives the third reference signal from the third UE in the fourth time unit.
  • the third UE and the first UE belong to the same communication system, such as the SL-U system.
  • the third UE and the second UE may be the same UE or different UEs, which is not limited in this embodiment of the present application.
  • the fourth time unit refer to the introduction of the first time unit, which will not be repeated here.
  • the fourth time unit and the first time unit may be the same time unit, or may be different time units, which is not limited in this embodiment of the present application.
  • the third reference signal is the first reference signal.
  • the second time unit may belong to resources configured by the network device for the first UE.
  • the third reference signal is different from the first reference signal.
  • the second time unit may belong to the resource configured by the network device for the first UE, or, when the fourth time unit is before the second time unit, the second time unit may also be the resource configured by the first UE based on the fourth time unit.
  • the resources reserved by the PSCCH in the cell are selected for resource selection.
  • the first UE detects the PSCCH in a fourth time unit.
  • the fifth threshold may be pre-configured, or the fifth threshold is configured by the communication group, or the fifth threshold is configured by the network device.
  • the fifth threshold includes an RSRP threshold.
  • the PSCCH is located after the third reference signal, and when the first UE detects that the received signal strength of the third reference signal is greater than the fifth threshold, the first UE continues to receive in the same time unit And detect PSCCH.
  • the first UE detects the PSCCH in the fourth time unit:
  • the first UE detects the PSCCH on all subchannels in the fourth time unit.
  • the first UE if the first UE receives the third reference signal in the fourth time unit, it means that within the fourth time unit, there is information transmission after the third reference signal.
  • the third UE transmits information through the PSCCH
  • the first UE can detect the PSCCH on all sub-channels of the fourth time unit. The blind detection range in the time domain is reduced, which helps to reduce the blind detection power consumption of the PSCCH.
  • Case 2 When the third reference signal occupies the first subchannel in the full bandwidth, the first UE detects the PSCCH on the first subchannel in the fourth time unit.
  • the first UE if the first UE receives the third reference signal on the first subchannel of the fourth time unit, it means that within the fourth time unit, after the third reference signal There is information transfer.
  • the third UE transmits information through the PSCCH on the first sub-channel
  • the first UE can detect the PSCCH on the first sub-channel in the fourth time unit, compared to blindly detecting the PSCCH on all sub-channels in all time units In other words, the blind detection range of the first UE in the time domain and the frequency domain is reduced, which helps to reduce the blind detection power consumption of the PSCCH.
  • the first UE After detecting the PSCCH, when the information carried by the PSCCH includes the first-level SCI, the first UE performs resource sensing based on the first-level SCI to determine reserved resources. See the introduction in Figure 4 for details. I won't repeat them here.
  • the information carried by the PSCCH includes the resource location information of the PSSCH
  • the first UE receives the information carried by the PSSCH based on the resource location information of the PSSCH, so as to realize the reception of data information.
  • the introduction of related technologies and will not repeat them here .
  • the first UE after the first UE performs S703, if signal transmission can be performed in the second time unit, the first UE further performs S710:
  • the first UE sends a fourth reference signal on the third resource.
  • the third resource is after at least one sub-time unit of S702 and before the second time unit, and the fourth reference signal is used to instruct the first UE to perform transmission in the second time unit.
  • the LBT process performed by the first UE includes LBT4.
  • the third resource may be one symbol preceding the GAP symbol in the first slot.
  • the first UE may send the fourth reference signal to occupy the channel in advance to avoid preemption by communication devices of different systems
  • the second time unit can also enable other UEs of the same system to measure the received signal strength of the same system, so as to prevent other UEs of the same system from preempting the second time unit, or enable UEs of the same system to distinguish between same-system interference and different-system interference.
  • indication information (such as the above-mentioned first indication information or second indication information) may be carried in the SCI to be sent through the PSCCH.
  • the indication information (such as the above first indication information or the second indication information) may be carried in the first-level SCI to be sent through the PSCCH.
  • the indication information (such as the first indication information or the second indication information) may be carried in the second-level SCI to be sent through the PSSCH.
  • the indication information (such as the above-mentioned first indication information, or the second indication information) may be carried in a media access control layer control element (media access control-control element, MAC CE), so as to pass the media access control layer (media access control, MAC) layer signaling.
  • a media access control layer control element media access control-control element, MAC CE
  • At least one sub-time unit in S702 includes the sub-time unit perceived after the first UE enters the random back-off state, or the first UE The number of sub-time units that the UE needs to perceive outside the deferment time. It should be understood that the first UE still needs to perceive a certain number of idle sub-time units within the delay time.
  • the determination of the busy state of such sub-time unit can refer to formula (2).
  • the determination of the busy state of such sub-time unit can refer to formula (3).
  • the sidelink channel access method is introduced. It should be understood that the number of the second UEs that send the first reference signal in the first time unit may also be at least two.
  • two UEs ie, UE1 and UE2 occupy transmission resources in a frequency division multiplexing manner.
  • the first time unit includes a first time slot
  • the second time unit includes a second time slot.
  • the first UE is UE3 in Fig. 8b
  • the second UE is UE1 and UE2 in Fig. 8b.
  • UE1 and UE2 occupy the first time unit in a frequency division multiplexing manner.
  • the number of second UEs is two.
  • each of the at least two second UEs sends the first reference signal in the first time unit.
  • the first UE receives the first reference signal from each of the at least two second UEs in the first time unit.
  • the received signal strength of the first reference signal determined by the first UE refers to the sum of the received signal strengths of the reference signals of each of the at least two second UEs.
  • the received signal strength of the first sub-time unit includes the interference of the communication device in the different system to itself , including interference from other UEs in the same system.
  • the self-interference of other UEs in the same system is determined based on the first reference signal of each second UE in the at least two second UEs.
  • the determination of the busy/idle status of the first sub-time unit can still refer to the introduction of formula (2). If the sub-time unit in which the first UE performs LBT includes the second sub-time unit, the determination of the busy/idle status of the second sub-time unit can still refer to the introduction of formula (3).
  • FIG. 8b only uses frequency division multiplexing as an example for introduction, and should not be construed as a limitation to this embodiment of the present application. At least two second UEs may also occupy the same transmission resource in a space division multiplexing manner.
  • the embodiment of the present application further provides a communication device, and the communication device may be the network element in the foregoing method embodiment, or a device including the foregoing network element, or may be a component applicable to the network element.
  • the communication device includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.
  • FIG. 16 shows a schematic structural diagram of a communication device 1600 .
  • the communication device 1600 includes a processing unit 1601 , a sending unit 1602 and a receiving unit 1603 .
  • the processing unit 1601 is configured to support the first UE to perform S702 and S703 in FIG. Other processing operations.
  • the sending unit 1602 is configured to support other sending operations that need to be performed by the first UE in this embodiment of the application.
  • the receiving unit 1603 is configured to support the first UE to perform S702 in FIG. 7 and/or other receiving operations that need to be performed by the first UE in this embodiment of the present application.
  • the processing unit 1601 is configured to support other processing operations that need to be performed by the second UE in this embodiment of the present application.
  • the sending unit 1602 is configured to support the second UE to perform S701 in FIG. 7 , and/or other sending operations that the second UE needs to perform in this embodiment of the application.
  • the receiving unit 1603 is configured to support other receiving operations that need to be performed by the second UE in this embodiment of the present application.
  • the communication device 1600 may further include a storage unit 1604 for storing program codes and data of the communication device, and the data may include but not limited to original data or intermediate data.
  • the processing unit 1601 may be a processor or a controller, such as a CPU, a general-purpose processor, an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on.
  • the sending unit 1602 may be a communication interface, a transmitter, or a sending circuit, etc., where the communication interface is collectively referred to, and in specific implementation, the communication interface may include multiple interfaces.
  • the receiving unit 1603 may be a communication interface, a receiver, or a receiving circuit, etc., where the communication interface is collectively referred to, and in specific implementation, the communication interface may include multiple interfaces.
  • the sending unit 1602 and the receiving unit 1603 may be physically or logically implemented as the same unit.
  • the storage unit 1604 may be a memory.
  • the processing unit 1601 is a processor
  • the sending unit 1602 and the receiving unit 1603 are communication interfaces
  • the storage unit 1604 is a memory
  • the communication device involved in this embodiment of the present application may be as shown in FIG. 17 .
  • the communication device 1700 includes: a processor 1701 , a communication interface 1702 , and a memory 1703 .
  • the communication device may further include a bus 1704 .
  • the communication interface 1702, the processor 1701 and the memory 1703 can be connected to each other through the bus 1704;
  • the bus 1704 can be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus etc.
  • the bus 1704 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 17 , but it does not mean that there is only one bus or one type of bus.
  • the embodiments of the present application further provide a computer program product carrying computer instructions, and when the computer instructions are run on a computer, the computer is made to execute the method described in the foregoing embodiments.
  • an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and when the computer instructions are run on a computer, the computer executes the method described in the above-mentioned embodiments.
  • an embodiment of the present application further provides a chip, including: a processing circuit and a transceiver circuit, and the processing circuit and the transceiver circuit are used to implement the methods described in the foregoing embodiments.
  • the processing circuit is used to execute the processing action in the corresponding method
  • the transceiver circuit is used to execute the receiving/sending action in the corresponding method.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • 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.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state drive (solid state drive, SSD)) wait.
  • a magnetic medium for example, a floppy disk, a hard disk, a tape
  • an optical medium for example, a digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state drive (solid state drive, SSD)
  • the disclosed system, device and method can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the modules is only a logical function division. In actual implementation, there may be other division methods.
  • multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or modules may be in electrical 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 may be distributed to multiple devices. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente demande, qui relève du domaine technique des communications sans fil, concerne un procédé d'accès à un canal de liaison latérale et un appareil de communication. Le taux d'utilisation de ressources d'un spectre sans licence peut être amélioré. Le procédé comprend les étapes suivantes : un premier équipement d'utilisateur (UE) reçoit, sur une première unité de temps, un premier signal de référence en provenance d'un second UE, le premier UE détecte l'intensité de signal reçue sur au moins une sous-unité de temps, et selon l'intensité de signal reçue du premier signal de référence et l'intensité de signal reçue de la ou des sous-unités de temps, le premier UE détermine que le premier UE réalise une transmission sur une seconde unité de temps.
PCT/CN2022/140463 2022-02-18 2022-12-20 Procédé d'accès à un canal de liaison latérale et appareil de communication WO2023155586A1 (fr)

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CN202210339478.1A CN116684967A (zh) 2022-02-18 2022-04-01 侧行链路信道接入方法及通信装置
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CN110547036A (zh) * 2019-07-26 2019-12-06 北京小米移动软件有限公司 竞争窗口的确定方法及装置、通信设备及存储介质
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