CN116996854A

CN116996854A - Channel access method and device and communication equipment

Info

Publication number: CN116996854A
Application number: CN202210442268.5A
Authority: CN
Inventors: 李�灿; 纪子超; 姜蕾; 王欢; 李�根
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-11-03
Also published as: WO2023207804A1

Abstract

The application discloses a channel access method, a device and communication equipment, which belong to the technical field of communication, and the channel access method of the embodiment of the application comprises the following steps: the first communication device determines the transmission condition of the second communication device on the target SL channel in the target detection time; the first communication equipment determines whether to access or not to access the target SL channel according to the transmission condition of the second communication equipment; wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

Description

Channel access method and device and communication equipment

Technical Field

The present application belongs to the technical field of communications, and in particular, relates to a channel access method, a device and a communication device.

Background

A Sidelink (SL, which may also be referred to or translated as a Sidelink, etc.) transmission means that data transmission between terminals (UEs) may be performed directly on the physical layer.

In the related art of SL, a SL node may implement channel access on an unlicensed spectrum by Listen-Before-Talk (LBT) method, for example, when the detected energy is below a threshold, consider the channel as empty, otherwise consider the channel as busy, and perform channel access when the channel is empty.

However, in the channel access scheme provided in the related art, there are problems such as low spectrum resource utilization efficiency, and the like, which affect the performance of the communication system.

Disclosure of Invention

The embodiment of the application provides a channel access method, a device and communication equipment, which can improve the utilization efficiency of spectrum resources and ensure the performance of a communication system.

In a first aspect, a channel access method is provided, including: the first communication equipment determines the transmission condition of the second communication equipment on a target sidelink SL channel in the target detection time; the first communication equipment determines whether to access or not to access the target SL channel according to the transmission condition of the second communication equipment; wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

In a second aspect, there is provided a channel access device for use with a first communication apparatus, comprising: the detection module is used for determining the transmission condition of the second communication equipment on the target sidelink SL channel in the target detection time; a determining module, configured to determine whether to access or not to access the target SL channel according to a transmission situation of the second communication device; wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

In a third aspect, there is provided a communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

In a fourth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the steps of the method according to the first aspect.

In a fifth aspect, a communication system is provided, comprising: a first communication device operable to perform the steps of the channel access method as described in the first aspect.

In a sixth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the first aspect.

In a seventh aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being configured to execute programs or instructions for implementing the steps of the method according to the first aspect.

In an eighth aspect, there is provided a computer program product stored in a storage medium, the computer program product being executable by at least one processor to perform the steps of the method according to the first aspect.

In this embodiment, when the first communication device accesses the target SL channel, the first communication device detects the transmission condition of other SL communication devices on the target SL channel, and determines whether to access or not access the target SL channel according to the transmission condition of other SL communication devices on the target SL channel, so that the SL device can perform frequency division multiplexing on the target SL channel, so as to increase the access probability of the target SL channel, improve the spectrum utilization rate of the target SL channel, and ensure the performance of the communication system.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an exemplary embodiment of the present application.

Fig. 2 is a flow chart of a channel access method according to an exemplary embodiment of the present application.

Fig. 3 is a flow chart of a channel access method according to another exemplary embodiment of the present application.

Fig. 4a is a schematic diagram of a determination process of a first value and a second value according to an exemplary embodiment of the present application.

Fig. 4b is a schematic diagram of SL channel transmission according to an exemplary embodiment of the present application.

Fig. 5 is a flowchart of a channel access method according to another exemplary embodiment of the present application.

Fig. 6a is a schematic diagram of SL transmission during a target detection time according to an exemplary embodiment of the present application.

Fig. 6b is a schematic diagram of SL transmission during a target detection time according to another exemplary embodiment of the present application.

Fig. 6c is a schematic diagram of SL transmission during a target detection time according to still another exemplary embodiment of the present application.

Fig. 6d is a schematic diagram of SL transmission during a target detection time according to another exemplary embodiment of the present application.

Fig. 7 is a schematic structural diagram of a channel access device according to an exemplary embodiment of the present application.

Fig. 8 is a schematic structural diagram of a communication device according to an exemplary embodiment of the present application.

Fig. 9 is a schematic structural view of a terminal according to an exemplary embodiment of the present application.

Fig. 10 is a schematic structural diagram of a network side device according to an exemplary embodiment of the present application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It should be noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single-carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiment of the present application, only a base station in the NR system is described as an example, and the specific type of the base station is not limited.

The technical scheme provided by the embodiment of the application is described in detail through some embodiments and application scenes thereof by combining the attached drawings.

As shown in fig. 2, a flow chart of a channel access method 200 according to an exemplary embodiment of the present application is provided, and the method 200 may be, but is not limited to being, performed by a first communication device, and in particular may be performed by hardware and/or software installed in the first communication device. In this embodiment, the method 200 may at least include the following steps.

S210, the first communication device determines the transmission situation of the second communication device on the target SL channel within the target detection time.

The first communication device and the second communication device may be terminals or network side devices, for example, the first communication device and the second communication device are both terminals, and for example, the first communication device is a terminal, the second communication device is a network side device, etc., which is not limited herein. Of course, in the present embodiment, the second communication device is another communication device than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data, that is, the first communication device and the second communication device may also be referred to as SL nodes.

The target detection time may also be referred to as an energy detection time, an energy detection opportunity, an energy detection window, etc., and the size of the target detection time may be implemented by protocol conventions, high-level configurations, or network-side configurations. For example, in this embodiment, the target detection time may be a sensing time slot duration (sensing slot duration, e.g., 9 us), a delay time (e.g., 16 us), a sensing interval (e.g., 25 us), or at least 4us within the sensing time slot duration.

Note that in this embodiment, the first communication device may perform, when detecting the transmission condition (or the occupied channel condition) of the second communication device, for one target SL channel, or may perform for a plurality of target SL channels. In addition, the transmission situation of the second communication device may include the presence or absence of a SL transmission corresponding to the second communication device, where the SL transmission includes at least one of a current SL transmission, a reserved SL transmission, a potential SL transmission, and an expected SL transmission.

Further, the process in which the first communication device detects the transmission situation of the second communication device may be understood as an LBT process, or a clear channel assessment (Clear Channel Assessment, CCA) process. Accordingly, the first communication device mentioned in S220 determines whether to access or not access the target SL channel according to the transmission situation of the second communication device, and may also be understood as successful or unsuccessful LBT (or CCA) for the target SL channel.

S220, the first communication device determines whether to access or not access the target SL channel according to the transmission condition of the second communication device.

As shown in fig. 3, a flow chart of a channel access method 300 according to an exemplary embodiment of the present application is provided, and the method 300 may be, but is not limited to being, executed by a first communication device, and in particular may be executed by hardware and/or software installed in the first communication device. In this embodiment, the method 300 may at least include the following steps.

S310, the first communication device determines the transmission situation of the second communication device on the target SL channel within the target detection time.

It will be appreciated that the implementation of S310 may include S311-S313, in one implementation, referring again to fig. 3, in addition to the relevant description in method embodiment 200, as follows.

S311, the first communication device receives target sidelink control information (Sidelink Control Information, SCI) based on the target detection time.

It may be understood that, in this embodiment, the second communication device may be a transmitting end of the target SCI, and of course, the second communication device may be a plurality of second communication devices, and the target SCI may also be a plurality of corresponding second communication devices. Based on this, in one implementation, the target SCI may include at least one of the following (11) - (16):

(11) SCI received within the target detection time.

(12) SCI received in a first period before or after the target detection time. The size of the first period may be implemented by protocol convention, high-level configuration or network side configuration. For example, the first period may include one slot (slot), or the like.

(13) SCI satisfying a first condition including a reference signal received power (reference signal received power, RSRP) or energy value of a demodulation reference signal (Demodulation Reference Signal, DMRS) indicated by the SCI exceeding a first threshold.

(14) And the received SCI in a target detection frequency domain (or LBT bandwidth), wherein the target detection frequency domain corresponds to the target SL channel.

(15) SCI received on a target resource pool, the target resource pool corresponding to the first communication device and/or the second communication device.

(16) SCI received on a target resource, the target resource corresponding to the first communication device and/or the second communication device.

Of course, as to which of the foregoing (11) - (16) is actually included in the target SCI, it may be implemented by protocol convention, a higher layer configuration or a network side configuration, which is not limited herein.

S312, the first communication equipment determines time-frequency resource information of a channel corresponding to the second communication equipment according to the target SCI.

Wherein the corresponding channel of the second communication device may be a physical sidelink control channel (Physical SideLink Control Channel, PSCCH), a physical sidelink shared channel (Physical SideLink Shared Channel, PSSCH), a PSCCH-DMRS, a PSSCH-DMRS, a physical sidelink feedback channel (Physical SideLink Feedback Channel, PSFCH), an automatic gain control (Automatic Gain Control, AGC), an interval (GAP), or the like. Based on this, the time-frequency resource information of the corresponding channel of the second communication device may be a slot (slot), a Symbol (Symbol), a start and length indication value (Start and length indicator value, SLIV), etc. of the time domain indicated by the target SCI, and/or the time-frequency resource information of the channel corresponding to the second communication device may also be a sub-channel (sub-channel), a physical resource block (Physical Resource Block, PRB), etc. indicated by the target SCI, which is not limited herein.

S313, the first communication device determines the transmission condition of the second communication device according to the time-frequency resource information of the channel corresponding to the second communication device.

And the first communication equipment determines that the SL transmission corresponding to the second communication equipment exists or the SL transmission corresponding to the second communication equipment does not exist on a target SL channel according to the time-frequency resource information of the channel corresponding to the second communication equipment.

It should be noted that, in one implementation manner, before the first communication device performs the checking of the transmission situation of the second communication device, it may also be determined whether the target SL channel is dedicated to the SL communication device, for example, in a case where the spectrum corresponding to the target SL channel is not a dedicated spectrum of the SL communication device, the first communication device may perform the step of determining, during the target detection time, the transmission situation of the second communication device on the target SL channel, and, for example, in a case where the spectrum corresponding to the target SL channel is a dedicated spectrum of the SL communication device, it is not necessary to perform LBT, and determine that the target SL channel is empty, thereby saving terminal energy consumption and improving channel access efficiency. The SL communication device at least includes the first communication device and the second communication device, and the spectrum corresponding to the target SL channel is a dedicated spectrum of the SL communication device, which may also be understood as no other coexistence system (such as WIFI).

S320, the first communication device determines whether to access or not access the target SL channel according to the transmission condition of the second communication device.

Wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

It will be appreciated that the implementation of S320 may include S321-S323, in addition to the relevant description in method embodiment 200, in one implementation, please refer again to fig. 3, as follows.

S321, the first communication device determines a target value according to a difference between the first value and the second value.

Wherein the first value may be understood as the total energy or total power detected by the first communication device on the target SL channel. In this embodiment, the first value may be determined by the first communication device according to any one of a received signal strength indication (Received Signal Strength Indication, RSSI) detected during the target detection time, an energy detection value detected during the target detection time, an RSSI of a PSCCH carrying the target SCI, and an RSSI of a PSSCH indicated by the SCI.

The second value may be understood as the energy or power of the SL transmission by the second communication device detected by the first communication device on the target SL channel. In this embodiment, the second value may be determined by the first communication device according to a transmission situation of the second communication device or an RSRP of the DMRS indicated by the target SCI.

In one implementation, the determining, by the first communication device, the second value according to the transmission situation of the second communication device within the target detection time may include: and when the transmission condition of the second communication equipment is that the SL transmission corresponding to the second communication equipment exists in the target detection time, the second value is a specific value. The specific value may be a specific value of protocol convention or network side configuration.

And when the transmission condition of the second communication equipment is that the SL transmission corresponding to the second communication equipment does not exist in the target detection time, the second value is 0.

In another implementation, the determining, by the first communication device, the second value according to the RSRP of the DMRS indicated by the target SCI may include: the first communication device determines the second value according to the target frequency domain resource information and the target RSRP; wherein the target frequency domain resource information may include at least one of frequency domain resource information of the DMRS indicated by the target SCI, frequency domain resource information of the PSCCH carrying the target SCI, and frequency domain resource information of the PSCCH carrying the target SCI.

The target RSRP may include an RSRP of the DMRS indicated by the target SCI. Wherein when the target SCI is plural, the target RSRP is an RSRP set of DMRS indicated by plural target SCIs.

Note that, in consideration that the number of symbols of the DMRS indicated by the target SCI may be 1 or more, then, when the number of symbols of the DMRS indicated by the SCI is plural, that is, when the number of symbols of the DMRS indicated by the target SCI is greater than 1, the RSRP of the DMRS indicated by the target SCI may include any one of the following (21) to (26).

For example, assuming that the second communication device is a plurality of devices, such as SL UE 1, SL UE 2, and SL UE 3 … …, where the RSRP of the DMRS indicated by the target SCI corresponding to SL UE 1 is RSRP1, the RSRP of the DMRS indicated by the target SCI corresponding to SL UE 2 is RSRP2, the RSRP of the DMRS indicated by the target SCI corresponding to SL UE 3 is RSRP3 … …, the frequency domain resource information of the DMRS indicated by the target SCI corresponding to SL UE 1 is RE1, the frequency domain resource information of the DMRS indicated by the target SCI corresponding to SL UE 2 is RE2, and the frequency domain resource information of the DMRS indicated by the target SCI corresponding to SL UE 3 is RE3, then the second value may be: RSRP1×re1 (number of Resource Elements (REs) corresponding to RSRP 1) +rsrp2×re2 (number of REs corresponding to RSRP 2) +rsrp3×re3 (number of REs corresponding to RSRP 3) + … ….

(21) And the RSRP corresponding to the DMRS on the preset symbol indicated by the target SCI. The preset symbol may be implemented by protocol convention or high-level configuration.

(22) And the average value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI.

(23) And the maximum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI.

(24) And the minimum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI.

(25) For the DMRS indicated by the target SCI, RSRP of the DMRS corresponding to the time domain position closest to the start time or the end time in the target detection time.

(26) And aiming at the DMRS indicated by the target SCI, the RSRP of the DMRS corresponding to the time domain position farthest from the starting time or the ending time in the target detection time.

It is to be understood that the DMRS in the foregoing (21) - (26) may also be DMRS corresponding to PSCCH or PSSCH, which is not limited herein.

In one implementation, when the second value is determined by the first communication device according to the RSRP of the DMRS indicated by the target SCI, the target detection time at least partially overlaps with the transmission time of the PSSCH or PSCCH carrying the target SCI, or the target detection time at least partially overlaps with the transmission time of the PSSCH or PSCCH indicated by the target SCI, which is not limited herein.

Further, it is noted that the first communication device may be configured to calculate the target value based on the value and the second value, the first value and the second value being obtained based on the same time unit, such as a symbol or the like.

Based on this, in one implementation, considering that there may be a plurality of target SL channels in the target detection time, the first communication device may determine the target value according to the type of the combined target SL channel when calculating the target value.

For example, in the case where the target detection time corresponds to a plurality of the target SL channels and the plurality of the target SL channels are the same type of channel, the first communication device determines the target value based on a difference between a third value and a fourth value. The third value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the third value is a first value corresponding to a specific SL channel of a plurality of target SL channels, or the third value is a first value corresponding to any SL channel of a plurality of target SL channels. The fourth value is an average value of a plurality of second values, the second values corresponding to the target SL channels one by one, or the fourth value is a second value corresponding to a specific SL channel among a plurality of target SL channels, or the fourth value is a second value corresponding to any SL channel among a plurality of target SL channels.

For another example, in a case where the target detection time corresponds to a plurality of the target SL channels and the plurality of the target SL channels correspond to different types of channels, the first communication device determines the target value according to a difference between a fifth value and a sixth value; the fifth value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the fifth value is a first value corresponding to a designated SL channel in a plurality of target SL channels, or the fifth value is a first value corresponding to any one of a plurality of target SL channels, or the fifth value is a first value corresponding to an SL channel with the earliest transmission time in a plurality of target SL channels, or the fifth value is a first value corresponding to an SL channel with the latest transmission time in a plurality of target SL channels.

The sixth value is a second value corresponding to a designated SL channel among the plurality of target SL channels, or the sixth value is a second value corresponding to any one of the plurality of target SL channels, or the sixth value is a second value corresponding to an SL channel having the earliest transmission time among the plurality of target SL channels, or the sixth value is a second value corresponding to an SL channel having the latest transmission time among the plurality of target SL channels.

Note that, on the basis of the foregoing description, it can be understood that determining the target value from the difference between the first value and the second value in this embodiment is: if the SL UE (i.e., the first communication device) detects that there are multiple other SL UEs (i.e., the second communication device) for the target detection time (e.g., a time slot), the first communication device may remove the energy (i.e., the second value) of the SL transmitted by the multiple other SL UEs from the total energy (i.e., the first value) detected during the CCA for the target detection time, and evaluate the channel state based on the removed energy (the foregoing procedure is simply based on the CCA detected by the SL transmission), so that one or more SL communication devices may be allowed to access the target SL channel during the same time, thereby improving the probability that the first communication device accesses the SL channel, and solving the problem that only one SL communication device may access the channel during the same time in the related art, resulting in lower resource utilization and lower transmission data rate.

For example, in the related art, when there is no WIFI user or a WIFI user with low energy exists in 20MHz, and the detected energy mainly comes from the SL communication device, but only a part of the spectrum in 20MHz occupied by the SL communication device is in a vacant state, so that the spectrum utilization rate is reduced.

S322, the first communication device determines the channel state of the target SL channel according to the target value.

In one implementation, when the first communication device determines the channel state of the target SL channel according to the target value, if the target value is greater than a first threshold value, the first communication device may determine that the channel state of the target SL channel is null; i.e. not occupied on the target SL channel or no second communication device is present on the target SL channel for SL transmission.

If the target value is less than a first threshold value, the first communication device determines that the target SL channel is busy, i.e., the target SL channel is occupied, or that there is a second communication device on the target SL channel for SL transmission.

Optionally, the first threshold value is related to a target detection frequency domain (or LBT bandwidth) corresponding to the target SL channel. For example, the first threshold may be "-72+10 log10 (BWMHz/20 MHz)", where BW is the bandwidth of the target detection frequency domain.

S323, the first communication device determines whether to access or not to access the target SL channel according to the channel state of the target SL channel.

In one implementation manner, in order to improve the accuracy of determining the channel state, the process of determining, by the first communication device, whether to access or not access the target sidelink SL channel according to the transmission situation of the second communication device may include at least one of the following two ways.

Mode 1: the first communication device determines to access the target SL channel when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed at least N times and the number of times that the target SL channel is empty is determined to be greater than a second threshold according to the transmission condition of the second communication device, where N is an integer greater than or equal to 1.

The second threshold is related to the type of LBT and/or the priority of LBT. For example, if the type of LBT is type 1, the second threshold is N, and the type of LBT is type 2, the second threshold is 1. For another example, if the priority level of LBT is 1 (highest priority), the second threshold is 1, and the priority level of LBT is 4 (lowest priority), the second threshold is N.

Mode 2: after the count value of the first counter is 0, the first communication device determines to access to the target SL channel transmission when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed M times and the number of times of determining that the target SL channel is empty according to the transmission condition of the second communication device is greater than a third threshold, where the first counter is used to instruct the first communication device to perform the number of times of determining the transmission condition of the second communication device on the target SL channel within the target detection time, and M is an integer greater than or equal to 1.

The third threshold is related to the type of LBT and/or the priority of LBT. For example, if the type of LBT is type1, the third threshold is M, and the type of LBT is type2, the third threshold is 1. For another example, if the priority level of LBT is 1 (highest priority), the third threshold is 1, and if the priority level of LBT is 4 (lowest priority), the third threshold is M.

It can be appreciated that, for the aforementioned Type of LBT, the Type (Type) of LBT commonly used in unlicensed spectrum (NRU) can be classified into Type1, type2A, type B and Type2C. The Type1 LBT is a channel interception mechanism based on back-off, and when the transmission node listens that the channel is busy, the transmission node performs back-off, and continues interception until the channel is empty. Type2C is that the transmitting node does not make LBT, i.e., no LBT or instant transmission (immediate transmission). Type2A and Type2B LBT are single-slot (one-shot) LBT, i.e. a node makes one LBT before transmitting, and if the channel is empty, it transmits, and if the channel is busy, it does not transmit. The difference is that Type2A makes LBT within 25us, which is suitable for the Gap between two transmissions to be 25us or more when sharing channel occupation time (channel occupancy time, COT). While Type2B makes LBT within 16us, it is suitable for the Gap between two transmissions to be equal to 16us when sharing COT. In addition, there is a Type 2LBT applicable to licensed assisted spectrum access (License Assisted Access, LAA), enhanced LAA (eLAA), further enhanced LAA (FeLAA), etc., when the COT is shared, gap between two transmissions is 25us or more, and the Type 2LBT may be adopted by the enb and the UE. In addition, in the frequency range (frequency range) 2-2, types of LBT are Type1, type2, and Type3.Type1 are channel listening mechanisms based on back-off, type2 is one-shot LBT, LBT is done for 5us within 8us, and Type3 is not done.

Based on the foregoing description of the channel access method, the implementation procedure of the channel access method provided in this embodiment is further described in conjunction with examples 1 and 2, and the following is described below.

Example 1

Referring to fig. 4a in combination, assuming that the first communication device detects a target SCI transmitted by a second communication device, such as SCI 1 in fig. 4a, the first value and the second value are determined as follows.

Case1: the first communication device may determine the second value according to RSRP of DMRS of PSCCH of symbol 1 and the number of REs of PSCCH of symbol 1, and determine the first value as RSSI of symbol 1.

Case2: the first communication device determines a second value according to RSRP of DMRS of PSCCH of symbol 2 and the number of REs of PSCCH of symbol 2, and determines the first value as RSSI of symbol 2.

Case3: the first communication device determines a second value according to the RSRP of the DMRS of the PSSCH transmitted by the symbol 3 and the number of REs of the PSSCH of the symbol 3, and determines the first value as the RSSI of the symbol 3.

Case4: the first communication device determines a second value according to the RSRP of the DMRS of the PSSCH of the symbol 3 and the number of REs of the PSSCH of the symbol 3, and determines the first value as the RSSI of the symbol 4.

Case5: the first communication device determines a second value according to the RSRP of the DMRS of the PSSCH of the symbol 3 and the number of REs of the PSSCH of the symbol 3, and determines the first value as the RSSI of the symbol 5.

Case6: the first communication device determines a second value according to the RSRP of the DMRS of the PSSCH of the symbol 8 and the number of REs of the PSSCH of the symbol 8, and determines the first value as the RSSI of the symbol 8.

Case7: the first communication device determines a second value according to RSRP of DMRS of the PSSCH of the symbol 8 and the number of REs of the PSSCH of the symbol 8, determines an RSSI corresponding to the PSSCH of the filling Gap of the symbol 10 as a first value, or determines the RSSI of the symbol 10 as a first value according to total energy detection.

Case8: the first communication device determines, based on the total energy detection, an RSSI of symbol 11 as a first value and 0 as a second value.

Note that in fig. 4a, PSCCH/1st SCI is transmitted on symbols 1, 2nd SCI is transmitted on symbols 3, 4 (i.e., PSSCH), and PSSCH is transmitted from symbol 1 to symbol 12. In addition, the PSSCH and PSCCH on symbol 1 and symbol 2 may be transmitted by frequency division multiplexing. Note that in fig. 4a, only 1 PRB is shown, but the present embodiment is not limited to the case of 1 PRB.

Example 2

As shown in fig. 4b, when the first communication device performs LBT at the slot n position, its starting position is symbol 8, the LBT bandwidth is 20MHz, and the target detection time T is according to _sl The location of the slot in which SCI 1 is received determines the reception of the target SCI. Determining the corresponding channel (e.g. PSSCH, PSCCH, PSFCH, AGC, GAP, DMRS, time-frequency resource information (e.g. time-frequency resource location)) of the second communication device based on SCI 1 and the indication of the corresponding resource pool configuration the sub-carrier spacing (Subcarrier Spacing, SCS) of the partial Bandwidth (BWP) is 15KHz, each s The length of ymbol is about 71us, thus when T _sl =9us, a target detection time may be contained within one Orthogonal Frequency Division Multiplexing (OFDM) symbol.

And subtracting the PSSCH (when determining that the channel is transmitted in the current energy detection time, the second power/energy value is a specific value predefined by a protocol or configured by a network; otherwise is 0) from the RSSI (received signal strength indicator) (namely the second value), obtaining a target value, comparing the target value with a first threshold value, and detecting that the channel is empty if the target value is smaller than the first threshold value. When the current channel is detected to be empty and the condition that the LBT is successful is satisfied, the first communication device may access the target SL channel, and perform SL transmission in other configured resource pools in the target SL channel of 20 MHz. In addition, PTRS in FIG. 4b is a Phase tracking reference signal (Phase-tracking reference signal).

In this embodiment, the first communication device obtains the information that the second communication device occupies the channel according to the target SCI, so as to detect the energy of each second communication device in the LBT bandwidth, the first communication device subtracts the received energy of the second communication device in the process of accessing the unlicensed channel, and then compares the energy with the first threshold value to determine whether the channel access can be performed, so that the spectrum utilization efficiency can be increased and the performance of the communication system can be ensured on the basis that the fairness among different communication systems is not affected.

As shown in fig. 5, a flow chart of a channel access method 500 according to an exemplary embodiment of the present application is provided, and the method 500 may be, but is not limited to being, performed by a first communication device, and in particular may be performed by hardware and/or software installed in the first communication device. In this embodiment, the method 500 may at least include the following steps.

S510, in the case where the target detection time is Gap, the first communication device executes S520 or S530.

The Gap may be implemented by protocol convention or high-level configuration during the target detection time, or the first communication device may determine through LBT process, which is not limited herein.

It will be appreciated that in Rel-16/Rel-17 SL, gaps exist between PSCCH/PSSCH slots and PSCCH/PSSCH slots, and between PSCCH/PSSCH and PSFCH, and between PSFCH and PSCCH/PSSCH, and that, if the first communication device assumes that there is no SL transmission on the Gap, the first communication device does not consider removing energy from other SL UEs (e.g., second communication devices) to transmit SL when the Gap is CCA (simply referred to as "CCA based on total energy detection"). The first communication device may perform CCA in the form of S520, that is, for CCA on PSCCH/PSSCH, since the first communication device can identify PSCCH/PSSCH transmission, the first communication device performs CCA based on SL transmission detection. While for CCA on Gap, the first communication device may perform CCA based on total energy detection, as in S530, the implementation procedure for S520 and S530 may be as follows.

And S520, in the case that the Gap is used for transmitting PSSCH and/or PSCCH, the first communication device determines the transmission condition of the second communication device on the target SL channel in the target detection time, and determines whether to access or not access the target SL channel according to the transmission condition of the second communication device. Wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

Whether the Gap is used for the PSSCH and/or PSCCH may be implemented by protocol conventions or higher layer configurations, etc. It should be understood that, regarding the "detecting the transmission condition of the second communication device within the target detection time" mentioned in S520 and determining whether to access or not to access the target SL channel according to the transmission condition of the second communication device "may refer to the related description in the method embodiments 200 and/or 300, and will not be repeated herein.

And S530, in the case that the Gap cannot be used for transmitting PSSCH and/or PSCCH, the first communication device determines the transmission condition of a third communication device on the Gap based on the target detection time, and determines whether to access or not access a target SL channel according to the transmission condition of the third communication device, wherein the third communication device is other communication devices except the first communication device, namely the third communication device can be a SL communication device or a non-SL communication device, and the method is not limited.

As shown in fig. 6a, since SL transmissions before Gap may be delayed into Gap, if the first communication device performs CCA based on total energy detection in the previous portion of Gap, with a high probability of CCA failure, the first communication device may perform any of (31) - (32).

(31) The first communication device pauses the LBT in a second period of time in the Gap, and performs LBT in other periods of time except the second period of time in the Gap to obtain the transmission condition of the third communication device

For example, as shown in fig. 6b, the first communication device pauses the CCA for a portion of the Gap (i.e., the second period), the pause time being for the UE to effect a decision/(pre-configuration decision/protocol convention). Wherein the second period is related to a delay time size of the SL transmission. Alternatively, the second period is implemented by the first communication device decision or (pre) configuration decision or protocol convention, etc., without limitation.

(32) And the first communication equipment executes LBT in a third period corresponding to the Gap to obtain the transmission condition of the third communication equipment, wherein the third period is positioned before SL transmission corresponding to the third communication equipment. Alternatively, the third period may be obtained by extending the Gap, or the third period may be a portion of the Gap where no SL is transmitted, or the like, thereby ensuring that no SL is transmitted in the third period.

For example, the first communication device performs CCA on Gap (i.e., a third period, e.g., 25 us) before SL transmission corresponding to the third communication device, until SL transmission corresponding to the third communication device starts. The CCA is a CCA based on total energy detection.

Alternatively, as shown in fig. 6c, the new Gap (i.e., the aforementioned third period) between PSCCH/PSSCH and PSCCH/PSSCH, between PSCCH/PSSCH and PSFCH, or between PSFCH and PSCCH/PSSCH may be agreed by a protocol or (pre-) configured to ensure that there is no delayed SL transmission within the new Gap. The new Gap length may be greater than 1 symbol, and the new Gap may be located at a Slot start position (e.g., the start position of Slot n+1 in fig. 6 c) or an end position. Note that the legacy Gap in fig. 6c is the Gap in the target detection time.

If the number of new gaps is greater than 1, the first communication device may also suspend CCA on some preset new gaps, where the suspension time is determined by the first communication device/(pre-configuration determination/protocol convention). (e.g., pause CCA on one/N Gap symbols after PSCCH/PSSCH end, pause CCA on one/N Gap symbols after PSFCH end)

Furthermore, in one implementation, for CCA on Gap, the first communication device may also fill (filing) a Gap if PSCCH/PSSCH transmissions of other SL UEs are detected as shown in fig. 6 d. The first pass device may remove energy of the SL transmission filling the Gap when performing CCA based on the SL transmission detection on the Gap (note that the form of filling the Gap is not limited, and filling the Gap may be in the form of repeating transmission PSSCH/transmission PSFCH, or the like).

In this embodiment, the first communication device determines the channel access according to the Gap information of the target detection time, so that the flexibility of the channel access process can be improved.

The execution body may be a channel access device according to the channel access method 200-500 provided in the embodiment of the present application. In the embodiment of the present application, the channel access device provided in the embodiment of the present application is described by taking the channel access device executing the channel access method 200-500 as an example.

As shown in fig. 7, a schematic structural diagram of a channel access device 700 according to an exemplary embodiment of the present application is provided, where the device 700 may include: a detection module 710, configured to determine a transmission situation of the second communication device on the target SL channel during the target detection time; a determining module 720, configured to determine whether to access or not access a target sidelink SL channel according to a transmission situation of the second communication device; wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

Optionally, the transmission situation of the second communication device includes that there is a SL transmission corresponding to the second communication device, or there is no SL transmission corresponding to the second communication device, where the SL transmission includes at least one of a current SL transmission, a reserved SL transmission, a potential SL transmission, and an expected SL transmission.

Optionally, the step of determining, by the detection module 710, a transmission condition of the second communication device on the target SL channel during the target detection time includes: receiving target sidelink control information SCI based on the target detection time; determining time-frequency resource information of a channel corresponding to the second communication equipment according to the target SCI; and determining the transmission condition of the second communication equipment according to the time-frequency resource information of the channel corresponding to the second communication equipment.

Optionally, the target SCI includes at least one of: SCI received within the target detection time; SCI received in a first period of time before or after the target detection time; SCI satisfying a first condition including a reference signal received power RSRP or an energy value of a demodulation reference signal DMRS indicated by the SCI exceeding a first threshold; SCI received in a target detection frequency domain, the target detection frequency domain corresponding to the target SL channel; SCI received on a target resource pool, the target resource pool corresponding to the first communication device and/or the second communication device; SCI received on a target resource, the target resource corresponding to the first communication device and/or the second communication device.

Optionally, the determining module 720 determines whether to access or not access the target SL channel according to the transmission situation of the second communication device, including: determining a target value according to a difference between a first value and a second value, wherein the first value is determined by the first communication device according to any one of a Received Signal Strength Indication (RSSI) detected in the target detection time, an energy detection value detected in the target detection time, an RSSI of a PSCCH carrying the target SCI, and an RSSI of a PSSCH indicated by the SCI, and the second value is determined by the first communication device according to a transmission condition of the second communication device or an RSRP of a DMRS indicated by the target SCI; determining the channel state of a target SL channel according to the target value; and determining whether to access or not to access the target SL channel according to the channel state of the target SL channel.

Optionally, when the transmission condition of the second communication device is that the SL transmission corresponding to the second communication device exists in the target detection time, determining the second value as a specific value, where the specific value is configured by a protocol convention or a higher layer; and determining that the second value is 0 when the transmission condition of the second communication device is that the SL transmission corresponding to the second communication device does not exist in the target detection time.

Optionally, the second value is determined according to the target frequency domain resource information and the target RSRP; the target frequency domain resource information comprises at least one of frequency domain resource information of a DMRS indicated by the target SCI, frequency domain resource information of a physical sidelink shared channel PSSCH carrying the target SCI and frequency domain resource information of a physical sidelink control channel PSCCH carrying the target SCI; the target RSRP includes an RSRP of the DMRS indicated by the target SCI.

Optionally, the RSRP of the DMRS indicated by the target SCI includes: in the case that the number of symbols of the DMRS indicated by the target SCI is greater than 1, the RSRP of the DMRS indicated by the target SCI includes any one of the following: RSRP corresponding to the DMRS on a preset symbol indicated by the target SCI; an average value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI; the maximum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI; the minimum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI; for the DMRS indicated by the target SCI, RSRP of the DMRS corresponding to the time domain position closest to the start time or the end time in the target detection time; and aiming at the DMRS indicated by the target SCI, the RSRP of the DMRS corresponding to the time domain position farthest from the starting time or the ending time in the target detection time.

Optionally, the target detection time at least partially overlaps with a transmission time of the PSSCH or PSCCH.

Optionally, the step of determining the target value by the determining module 720 according to the difference between the first value and the second value includes at least one of: determining the target value according to a difference value between a third value and a fourth value when the target detection time corresponds to a plurality of target SL channels and the plurality of target SL channels are the same type of channel; determining the target value according to a difference between a fifth value and a sixth value under the condition that the target detection time corresponds to a plurality of target SL channels and the plurality of target SL channels respectively correspond to different types of channels; the third value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the third value is a first value corresponding to a designated SL channel of a plurality of target SL channels, or the third value is a first value corresponding to any SL channel of a plurality of target SL channels; the fourth value is an average value of a plurality of second values, the second values are in one-to-one correspondence with the target SL channels, or the fourth value is a second value corresponding to a specific SL channel among a plurality of target SL channels, or the fourth value is a second value corresponding to any SL channel among a plurality of target SL channels; the fifth value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the fifth value is a first value corresponding to a designated SL channel among a plurality of the target SL channels, or the fifth value is a first value corresponding to any one of a plurality of the target SL channels, or the fifth value is a first value corresponding to an SL channel with the earliest transmission time among a plurality of the target SL channels, or the fifth value is a first value corresponding to an SL channel with the latest transmission time among a plurality of the target SL channels; the sixth value is a second value corresponding to a designated SL channel among the plurality of target SL channels, or the sixth value is a second value corresponding to any one of the plurality of target SL channels, or the sixth value is a second value corresponding to an SL channel having the earliest transmission time among the plurality of target SL channels, or the sixth value is a second value corresponding to an SL channel having the latest transmission time among the plurality of target SL channels.

Optionally, the step of determining the channel state of the target SL channel by the determining module 720 according to the target value includes: determining that the target SL channel is empty when the target value is larger than a first threshold value; determining that the target SL channel is busy when the target value is smaller than a first threshold value; wherein, the first threshold value is related to a target detection frequency domain corresponding to the target SL channel.

Optionally, the determining module 720 determines whether to access or not access the target sidelink SL channel according to the transmission situation of the second communication device, including at least one of the following: determining to access the target SL channel when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed N times and the number of times that the target SL channel is empty is determined to be greater than a second threshold according to the transmission condition of the second communication device, where N is an integer greater than or equal to 1; after the count value of the first counter is 0, determining to access to the target SL channel transmission when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed M times and the number of times of determining that the target SL channel is empty according to the transmission condition of the second communication device is greater than a third threshold, where the first counter is used to instruct the first communication device to perform the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time, and M is an integer greater than or equal to 1.

Optionally, the second threshold is related to the type of LBT and/or the priority of LBT; and/or, the third threshold is related to the type of LBT and/or the priority of LBT.

Optionally, in the case that the target detection time is Gap, and the Gap is used for transmitting PSSCH and/or PSCCH, the detection module 710 performs the step of determining, in the target detection time, a transmission condition of the second communication device on the target SL channel, and the determination module 720 determines whether to access or not to access the target SL channel according to the transmission condition of the second communication device; and/or, in the case that the target detection time is Gap, and the Gap cannot be used for transmitting the PSSCH and/or the PSCCH, the detection module 710 is further configured to determine, based on the target detection time, a transmission situation of a third communication device on the Gap, and the determination module 720 is further configured to determine whether to access or not access a target SL channel according to the transmission situation of the third communication device, where the third communication device is other than the first communication device.

Optionally, the step of determining, by the detection module 710, a transmission scenario of the third communication device on the Gap based on the target detection time includes any one of the following: suspending the LBT in a second period in the Gap, and performing LBT in other periods except the second period in the Gap to obtain the transmission condition of the third communication equipment, wherein the second period is related to the delay time of SL transmission; and executing LBT in a third period corresponding to the Gap to obtain the transmission condition of the third communication equipment, wherein the third period is positioned before SL transmission corresponding to the third communication equipment.

Optionally, the detecting module 710 is configured to perform the step of determining, in the target detection time, a transmission situation of the second communication device on the target SL channel, where the SL communication device includes at least the first communication device and the second communication device, in a case where the spectrum corresponding to the target SL channel is not a dedicated spectrum of the SL communication device.

The channel access device 700 in the embodiment of the present application may be an electronic device or a network side device, and when the channel access device 700 is an electronic device, the channel access device may be an electronic device with an operating system, or may be a component in the electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal. By way of example, the terminals may include, but are not limited to, the types of terminals 11 listed above. When the channel access device 700 is a network-side device, the network-side device may be a server, a network attached storage (Network Attached Storage, NAS), or the like, and the network-side device may include, but is not limited to, the types of the network-side device 12 listed above, which are not specifically limited in the embodiments of the present application.

The channel access device 700 provided in the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 2 to 5, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.

Optionally, as shown in fig. 8, the embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802, where the memory 802 stores a program or instructions that can be executed on the processor 801, for example, when the communication device 800 is a terminal, the program or instructions implement the steps of the foregoing method embodiments 200-500 when executed by the processor 801, and achieve the same technical effects. When the communication device 800 is a network side device, the program or the instruction, when executed by the processor 801, implements the steps of the above method embodiments 200 to 500, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

In one implementation, when the communication device 800 is a terminal, the terminal may include a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute programs or instructions to implement the steps of the methods described in method embodiments 200-500. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment are applicable to the terminal embodiment and can achieve the same technical effects. Specifically, fig. 9 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 900 includes, but is not limited to: at least some of the components of the radio frequency unit 901, the network module 902, the audio output unit 903, the input unit 904, the sensor 905, the display unit 906, the user input unit 907, the interface unit 908, the memory 909, and the processor 910.

Those skilled in the art will appreciate that the terminal 900 may further include a power source (e.g., a battery) for powering the various components, and the power source may be logically coupled to the processor 910 by a power management system so as to perform functions such as managing charging, discharging, and power consumption by the power management system. The terminal structure shown in fig. 9 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 904 may include a graphics processing unit (Graphics Processing Unit, GPU) 1041 and a microphone 9042, with the graphics processor 9041 processing image data of still pictures or video obtained by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 907 includes at least one of a touch panel 9071 and other input devices 9072. Touch panel 9071, also referred to as a touch screen. The touch panel 9071 may include two parts, a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In the embodiment of the present application, after receiving downlink data from a network side device, the radio frequency unit 901 may transmit the downlink data to the processor 910 for processing; in addition, the radio frequency unit 901 may send uplink data to the network side device. Typically, the radio frequency unit 901 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 909 may be used to store software programs or instructions as well as various data. The memory 909 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 909 may include a volatile memory or a nonvolatile memory, or the memory 909 may include both volatile and nonvolatile memories. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 909 in embodiments of the application includes, but is not limited to, these and any other suitable types of memory.

Processor 910 may include one or more processing units; optionally, the processor 910 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, etc., and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 910.

Wherein the processor 910 is configured to determine, during the target detection time, a transmission condition of the second communication device on the target SL channel; determining whether to access or not access a target sidelink SL channel according to the transmission condition of the second communication equipment; wherein the second communication device is a communication device other than the first communication device, and the first communication device and the second communication device are communication devices for transmitting SL data.

In another implementation, when the communication device 800 is a network-side device, the network-side device may include a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the steps of the methods described in embodiments 200-500. The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 10, the network side device 1000 includes: an antenna 1001, a radio frequency device 1002, a baseband device 1003, a processor 1004, and a memory 1005. The antenna 1001 is connected to a radio frequency device 1002. In the uplink direction, the radio frequency device 1002 receives information via the antenna 1001, and transmits the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes information to be transmitted, and transmits the processed information to the radio frequency device 1002, and the radio frequency device 1002 processes the received information and transmits the processed information through the antenna 1001.

The method performed by the network-side device in the above embodiment may be implemented in the baseband apparatus 1003, and the baseband apparatus 1003 includes a baseband processor.

The baseband apparatus 1003 may, for example, include at least one baseband board, where a plurality of chips are disposed on the baseband board, as shown in fig. 10, where one chip, for example, a baseband processor, is connected to the memory 1005 through a bus interface, so as to call a program in the memory 1005 to perform the network device operation shown in the above method embodiment.

The network side device may also include a network interface 1006, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 1000 of the embodiment of the present application further includes: instructions or programs stored in the memory 1005 and executable on the processor 1004, the processor 1004 invokes the instructions or programs in the memory 1005 to perform the methods performed by the modules shown in fig. 7 and achieve the same technical effects, and are not described herein in detail to avoid repetition.

The embodiment of the present application also provides a readable storage medium, where a program or an instruction is stored, and when the program or the instruction is executed by a processor, the processes of the foregoing channel access method embodiments 200 to 500 are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used for running a network side device program or instruction, so as to implement each process of the above-mentioned channel access method embodiments 200-500, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiment of the application also provides a computer program product, which comprises a processor, a memory and a program or an instruction stored in the memory and capable of running on the processor, wherein when the program or the instruction is executed by the processor, the processes of the above-mentioned channel access method embodiments 200-500 are realized, and the same technical effects can be achieved, so that repetition is avoided, and no further description is provided herein.

The embodiment of the application also provides a communication system, which comprises: the first communication device may be configured to perform the respective processes in the channel access method embodiments 200-500 described above, and achieve the same technical effects, and are not described herein again for avoiding repetition.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A method of channel access, comprising:

the first communication equipment determines the transmission condition of the second communication equipment on a target sidelink SL channel in the target detection time;

the first communication equipment determines whether to access or not to access the target SL channel according to the transmission condition of the second communication equipment;

2. The method of claim 1, wherein the transmission case of the second communication device comprises the presence or absence of a SL transmission corresponding to the second communication device, wherein the SL transmission comprises at least one of a current SL transmission, a reserved SL transmission, a potential SL transmission, an expected SL transmission.

3. The method of claim 1, wherein the step of the first communication device determining the transmission of the second communication device on the target SL channel during the target detection time comprises:

the first communication device receives target sidelink control information SCI based on the target detection time;

The first communication equipment determines time-frequency resource information of a channel corresponding to the second communication equipment according to the target SCI;

the first communication equipment determines the transmission condition of the second communication equipment according to the time-frequency resource information of the channel corresponding to the second communication equipment.

4. The method of claim 3, wherein the target SCI comprises at least one of:

SCI received within the target detection time;

SCI received in a first period of time before or after the target detection time;

SCI satisfying a first condition including a reference signal received power RSRP or an energy value of a demodulation reference signal DMRS indicated by the SCI exceeding a first threshold;

SCI received in a target detection frequency domain, the target detection frequency domain corresponding to the target SL channel;

SCI received on a target resource pool, the target resource pool corresponding to the first communication device and/or the second communication device;

SCI received on a target resource, the target resource corresponding to the first communication device and/or the second communication device.

5. The method according to any of claims 1-4, wherein the step of the first communication device determining whether to access or not to access the target SL channel based on the transmission situation of the second communication device comprises:

The first communication device determines a target value according to a difference between a first value and a second value, wherein the first value is determined by the first communication device according to any one of a Received Signal Strength Indication (RSSI) detected in the target detection time, an energy detection value detected in the target detection time, an RSSI of a PSCCH carrying the target SCI, and an RSSI of a PSSCH indicated by the SCI, and the second value is determined by the first communication device according to a transmission condition of the second communication device or an RSRP of a DMRS indicated by the target SCI;

the first communication device determines the channel state of a target SL channel according to the target value;

the first communication device determines whether to access or not to access the target SL channel according to the channel state of the target SL channel.

6. The method of claim 5, wherein the second value is a specific value, the specific value being agreed by a protocol or being configured by a higher layer, in a case where the transmission condition of the second communication device is that there is SL transmission corresponding to the second communication device within the target detection time;

7. The method of claim 5, wherein the second value is determined based on target frequency domain resource information and target RSRP;

the target frequency domain resource information comprises at least one of frequency domain resource information of a DMRS indicated by the target SCI, frequency domain resource information of a physical sidelink shared channel PSSCH carrying the target SCI and frequency domain resource information of a physical sidelink control channel PSCCH carrying the target SCI;

the target RSRP includes an RSRP of the DMRS indicated by the target SCI.

8. The method of claim 7, wherein the RSRP of the DMRS indicated by the target SCI comprises:

in the case that the number of symbols of the DMRS indicated by the target SCI is greater than 1, the RSRP of the DMRS indicated by the target SCI includes any one of the following:

RSRP corresponding to the DMRS on a preset symbol indicated by the target SCI;

an average value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI;

the maximum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI;

the minimum value of RSRP corresponding to each symbol in the DMRS indicated by the target SCI;

for the DMRS indicated by the target SCI, RSRP of the DMRS corresponding to the time domain position closest to the start time or the end time in the target detection time;

And aiming at the DMRS indicated by the target SCI, the RSRP of the DMRS corresponding to the time domain position farthest from the starting time or the ending time in the target detection time.

9. The method of claim 7, wherein the target detection time at least partially overlaps with a transmission time of the PSSCH or PSCCH.

10. The method according to any of claims 5-9, wherein the step of the first communication device determining the target value from the difference of the first value and the second value comprises at least one of:

in the case that the target detection time corresponds to a plurality of the target SL channels and the plurality of the target SL channels are the same type of channel, the first communication device determines the target value according to a difference between a third value and a fourth value;

in the case that the target detection time corresponds to a plurality of the target SL channels and the plurality of the target SL channels correspond to different types of channels, the first communication device determines the target value according to a difference between a fifth value and a sixth value;

the third value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the third value is a first value corresponding to a designated SL channel of a plurality of target SL channels, or the third value is a first value corresponding to any SL channel of a plurality of target SL channels;

The fourth value is an average value of a plurality of second values, the second values are in one-to-one correspondence with the target SL channels, or the fourth value is a second value corresponding to a specific SL channel among a plurality of target SL channels, or the fourth value is a second value corresponding to any SL channel among a plurality of target SL channels;

the fifth value is an average value of a plurality of first values, the first values are in one-to-one correspondence with the target SL channels, or the fifth value is a first value corresponding to a designated SL channel among a plurality of the target SL channels, or the fifth value is a first value corresponding to any one of a plurality of the target SL channels, or the fifth value is a first value corresponding to an SL channel with the earliest transmission time among a plurality of the target SL channels, or the fifth value is a first value corresponding to an SL channel with the latest transmission time among a plurality of the target SL channels;

11. The method according to any of claims 5-10, wherein the step of the first communication device determining the channel state of the target SL channel from the target value comprises:

the first communication device determines that the target SL channel is empty when the target value is larger than a first threshold value;

the first communication device determining that the target SL channel is busy if the target value is less than a first threshold value;

wherein, the first threshold value is related to a target detection frequency domain corresponding to the target SL channel.

12. The method according to any of claims 1-11, wherein the step of the first communication device determining whether to access or not to access the target sidelink SL channel based on the transmission situation of the second communication device, comprises at least one of:

the first communication device determines to access the target SL channel when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed N times and the number of times that the target SL channel is empty is determined to be greater than a second threshold according to the transmission condition of the second communication device, where N is an integer greater than or equal to 1;

After the count value of the first counter is 0, the first communication device determines to access to the target SL channel transmission when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed M times and the number of times of determining that the target SL channel is empty according to the transmission condition of the second communication device is greater than a third threshold, where the first counter is used to instruct the first communication device to perform the number of times of determining the transmission condition of the second communication device on the target SL channel within the target detection time, and M is an integer greater than or equal to 1.

13. The method of claim 12, wherein the second threshold is related to a type of LBT and/or a priority of LBT;

and/or, the third threshold is related to the type of LBT and/or the priority of LBT.

14. The method of claim 1 or 2, wherein the method further comprises:

in the case where both of the target detection times are Gap, the first communication device performs any one of:

in the case that the Gap is used for transmitting the PSSCH and/or the PSCCH, the first communication device executes the steps of determining the transmission condition of the second communication device on the target SL channel within the target detection time, and determining whether to access or not access the target SL channel according to the transmission condition of the second communication device;

In case the Gap cannot be used for transmitting PSSCH and/or PSCCH, the first communication device determines a transmission situation of a third communication device on the Gap based on the target detection time, and determines whether to access or not to access a target SL channel according to the transmission situation of the third communication device, wherein the third communication device is other than the first communication device.

15. The method according to claim 1 or 2, wherein the step of the first communication device determining a transmission scenario of a third communication device on the Gap based on the target detection time comprises any one of:

the first communication equipment pauses the LBT in a second period in the Gap, and performs LBT in other periods except the second period in the Gap to obtain the transmission condition of the third communication equipment, wherein the second period is related to the delay time of SL transmission;

and the first communication equipment executes LBT in a third period corresponding to the Gap to obtain the transmission condition of the third communication equipment, wherein the third period is positioned before SL transmission corresponding to the third communication equipment.

16. The method of any one of claims 1-14, wherein the method further comprises:

and in the case that the spectrum corresponding to the target SL channel is not a dedicated spectrum of the SL communication device, the first communication device performs the step of determining the transmission situation of the second communication device on the target SL channel within the target detection time, where the SL communication device includes at least the first communication device and the second communication device.

17. A channel access device for use with a first communication device, comprising:

the detection module is used for determining the transmission condition of the second communication equipment on the target sidelink SL channel in the target detection time;

a determining module, configured to determine whether to access or not to access the target SL channel according to a transmission situation of the second communication device;

18. The apparatus of claim 17, wherein the transmission case of the second communication device comprises the presence or absence of a SL transmission corresponding to the second communication device, wherein the SL transmission comprises at least one of a current SL transmission, a reserved SL transmission, a potential SL transmission, an expected SL transmission.

19. The apparatus of claim 17, wherein the detecting means determines the transmission of the second communication device on the target SL channel during the target detection time comprises:

receiving target sidelink control information SCI based on the target detection time;

determining time-frequency resource information of a channel corresponding to the second communication equipment according to the target SCI;

and determining the transmission condition of the second communication equipment according to the time-frequency resource information corresponding to the channel of the second communication equipment.

20. The apparatus of claim 19, wherein the target SCI comprises at least one of:

SCI received within the target detection time;

21. The apparatus according to any one of claims 17-20, wherein the determining module determines whether to access or not to access the target SL channel based on a transmission status of the second communication device, comprising:

determining a target value according to a difference between a first value and a second value, wherein the first value is determined by the first communication device according to any one of a Received Signal Strength Indication (RSSI) detected in the target detection time, an energy detection value detected in the target detection time, an RSSI of a PSCCH carrying the target SCI, and an RSSI of a PSSCH indicated by the SCI, and the second value is determined by the first communication device according to a transmission condition of the second communication device or an RSRP of a DMRS indicated by the target SCI;

determining the channel state of a target SL channel according to the target value;

and determining whether to access or not to access the target SL channel according to the channel state of the target SL channel.

22. The apparatus of claim 21, wherein the determining means determines the second value based on a transmission of the second communication device during the target detection time, comprising:

Determining that the second value is a specific value under the condition that the transmission condition of the second communication device is that the SL transmission corresponding to the second communication device exists in the target detection time, wherein the specific value is appointed by a protocol or is configured by a high layer;

and determining that the second value is 0 when the transmission condition of the second communication device is that the SL transmission corresponding to the second communication device does not exist in the target detection time.

23. The apparatus of claim 21, wherein the second value is determined based on target frequency domain resource information and a target RSRP;

the target RSRP includes an RSRP of the DMRS indicated by the target SCI.

24. The apparatus of claim 23, wherein the RSRP of the DMRS indicated by the target SCI comprises:

RSRP corresponding to the DMRS on a preset symbol indicated by the target SCI;

25. The apparatus of claim 23, wherein the target detection time at least partially overlaps with a transmission time of the PSSCH or PSCCH.

26. The apparatus according to any one of claims 21-25, wherein the step of the determination module determining the target value based on a difference between the first value and the second value comprises at least one of:

determining the target value according to a difference value between a third value and a fourth value when the target detection time corresponds to a plurality of target SL channels and the plurality of target SL channels are the same type of channel;

Determining the target value according to a difference between a fifth value and a sixth value under the condition that the target detection time corresponds to a plurality of target SL channels and the plurality of target SL channels respectively correspond to different types of channels;

27. The apparatus according to any of claims 21-26, wherein the determining module determines the channel state of the target SL channel based on the target value comprises:

determining that the target SL channel is empty when the target value is larger than a first threshold value;

determining that the target SL channel is busy when the target value is smaller than a first threshold value;

28. The apparatus according to any of claims 17-27, wherein the determining module determines whether to access or not to access the target sidelink SL channel based on a transmission situation of the second communication device, comprising at least one of:

Determining to access the target SL channel when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed N times and the number of times that the target SL channel is empty is determined to be greater than a second threshold according to the transmission condition of the second communication device, where N is an integer greater than or equal to 1;

after the count value of the first counter is 0, determining to access to the target SL channel transmission when the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time is performed M times and the number of times of determining that the target SL channel is empty according to the transmission condition of the second communication device is greater than a third threshold, where the first counter is used to instruct the first communication device to perform the step of determining the transmission condition of the second communication device on the target SL channel within the target detection time, and M is an integer greater than or equal to 1.

29. The apparatus of claim 28, wherein the second threshold is related to a type of LBT and/or a priority of LBT;

30. The apparatus according to claim 17 or 18, wherein said detection module performs said step of determining a transmission situation of a second communication device on a target SL channel during a target detection time, and said determination module determines whether to access or not to access the target SL channel based on the transmission situation of said second communication device, in case that both of said target detection times are Gap and said Gap is used for transmission of PSSCH and/or PSCCH;

and/or the number of the groups of groups,

the detection module is further configured to determine a transmission situation of a third communication device on the Gap based on the target detection time, and the determination module is further configured to determine whether to access or not access a target SL channel according to the transmission situation of the third communication device, where the third communication device is other than the first communication device, when the target detection time is all the Gap and the Gap cannot be used for transmitting the PSSCH and/or the PSCCH.

31. The apparatus of claim 17 or 18, wherein the step of the detection module determining a transmission scenario of a third communication device on the Gap based on the target detection time comprises any one of:

Suspending the LBT in a second period in the Gap, and performing LBT in other periods except the second period in the Gap to obtain the transmission condition of the third communication equipment, wherein the second period is related to the delay time of SL transmission;

and executing LBT in a third period corresponding to the Gap to obtain the transmission condition of the third communication equipment, wherein the third period is positioned before SL transmission corresponding to the third communication equipment.

32. The apparatus according to any of claims 17-30, wherein the detection module is configured to perform the step of determining a transmission situation of a second communication device on the target SL channel within a target detection time, in case the spectrum corresponding to the target SL channel is not a dedicated spectrum of the SL communication device, wherein the SL communication device comprises at least the first communication device and the second communication device.

33. A communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the channel access method of any of claims 1 to 16.

34. A readable storage medium, characterized in that it has stored thereon a program or instructions which, when executed by a processor, implement the steps of the channel access method according to any of claims 1 to 16.