WO2024093972A1

WO2024093972A1 - Communication method and apparatus

Info

Publication number: WO2024093972A1
Application number: PCT/CN2023/128198
Authority: WO
Inventors: 黎超; 焦瑞晟
Original assignee: 华为技术有限公司
Priority date: 2022-11-04
Filing date: 2023-10-31
Publication date: 2024-05-10
Also published as: CN117201254A

Abstract

Provided in the embodiments of the present application are a communication method and apparatus. The method comprises: a first terminal device determining M frequency domain resource sets, comprising first frequency domain resource sets and a second frequency domain resource set, wherein the second frequency domain resource set comprises frequency domain resources of sidelink synchronization signal resources, and the first frequency domain resource sets are M-1 frequency domain resource sets other than the second frequency domain resource set; and the first terminal device sending a sidelink synchronization signal block and a first signal on a first time unit, wherein the sidelink synchronization signal block is located in the second frequency domain resource set, the first signal is located in a first frequency domain resource set, the first signal comprises a physical sidelink broadcast channel (PSBCH), and the first signal is determined by means of an index of a frequency domain resource set. The method disclosed in the present application ensures that signals sent from a first frequency domain resource set and a second frequency domain resource set on a first time unit are different, so as to avoid the impact of a high peak-to-average ratio, thereby improving the system transmission performance.

Description

Communication method and device

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office of China on November 4, 2022, with application number 202211379721.9, the priority of the Chinese patent application with the invention name “Communication method and device”, the priority of the Chinese patent application filed with the State Intellectual Property Office of China on February 17, 2023, with application number 202310182634.2, the priority of the Chinese patent application with the invention name “Communication method and device”, the priority of the Chinese patent application filed with the State Intellectual Property Office of China on August 11, 2023, with application number 202311010855.8, and the priority of the Chinese patent application with the invention name “Communication method and device”, all of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of communications, and more specifically, to a communication method and device.

Background technique

In wireless communication systems, spectrum resources can be divided into licensed spectrum and unlicensed spectrum. In the sidelink (SL) transmission process, enabling unlicensed spectrum is an important evolution direction, and the corresponding protocol technology can be collectively referred to as the sidelink of unlicensed spectrum (sidelink unlicensed, SL-U). In the unlicensed spectrum, the terminal device needs to select physical resources in the resource pool for data transmission. For example, the terminal device can seize the channel by listening before talking (LBT), or share the resources obtained after other terminal devices seize the channel to transmit data.

In SL-U, if the channel occupancy period (COT) obtained by the terminal device through Type 1 LBT overlaps with the S-SSB resource location configured on the resource pool, a COT interruption will occur. Then, the terminal device needs to restart the Type 1 LBT process, which may increase the delay of side transmission and cannot guarantee the reliability of system transmission.

Summary of the invention

The present application provides a communication method and device, which can improve the reliability of system transmission.

In a first aspect, a communication method is provided, which can be performed by a first terminal device (e.g., user equipment (UE1)), or can also be performed by a chip or circuit for the first terminal device, which is not limited in the present application. For ease of description, the following description is given by taking the first terminal device as an example.

The method includes: the first terminal device determines M frequency domain resource sets, the M frequency domain resource sets include a first frequency domain resource set and a second frequency domain resource set, the second frequency domain resource set includes frequency domain resources of sidelink synchronization signal resources, the first frequency domain resource set is other M-1 frequency domain resource sets except the second frequency domain resource set, and M is an integer greater than 1; the first terminal device sends a sidelink synchronization signal block and a first signal in a first time unit, the sidelink synchronization signal block is located in the second frequency domain resource set, the first signal is located in the first frequency domain resource set, the first signal includes a physical sidelink broadcast channel (physical sidelink broadcast channel, PSBCH), and the first signal is determined by the index of the frequency domain resource set.

Exemplarily, the frequency domain resource set includes any one of the following: the frequency domain resource set is a resource block set on a resource pool; the frequency domain resource set is a resource block set included in the channel occupancy time COT of the first terminal device; M frequency domain resource sets are located in a synchronization resource block set, and the synchronization resource block set includes a second frequency domain resource set and M-1 first frequency domain resource sets; M frequency domain resource sets are M1 frequency domain resource sets located on the resource pool, and each resource block set includes M2 frequency domain resource sets; or, M frequency domain resource sets are M1 frequency domain resource sets located on the channel occupancy time COT of the first terminal device, and each resource block set includes M2 frequency domain resource sets.

Optionally, the first signal can be determined by any of the following methods: an index of a primary synchronization signal in a resource block set (e.g., RB set) or an index of a frequency domain resource set occupied by the primary synchronization signal; an index of a secondary synchronization signal in a resource block set or an index of a frequency domain resource set occupied by the secondary synchronization signal; an index of a PSBCH in a resource block set or an index of a frequency domain resource set occupied by the PSBCH.

According to the solution provided in the present application, the first terminal device determines M frequency domain resource sets, and sends a side synchronization signal block on the second frequency domain resource set on the first time unit, and sends a first signal on the first frequency domain resource set on the first time unit, ensuring that the signals sent by the first frequency domain resource set and the second frequency domain resource set on the first time unit are different, so as to avoid the influence of the high peak-to-average ratio and thereby improve the system transmission performance.

In combination with the first aspect, in some implementations of the first aspect, the first signal also includes: a sidelink primary synchronization signal (S-PSS), and/or a sidelink secondary synchronization signal (S-SSS).

In combination with the first aspect, in some implementations of the first aspect, the first terminal device obtains channel occupancy time (COT), and the COT includes a first frequency domain resource set and a second frequency domain resource set.

In combination with the first aspect, in certain implementations of the first aspect, all first signals are PSBCHs.

Based on this implementation method, mapping the first signal (i.e., PSBCH) on the asynchronous RB set on the synchronous time unit can ensure that the signals on the S-PSS symbol and the S-SSS symbol on each RB set are different, thereby reducing the peak to average power ratio (PAPR).

In combination with the first aspect, in certain implementations of the first aspect, the first terminal device copies the PSBCH of the second frequency domain resource set on the first time unit to the symbol corresponding to the first frequency domain resource set in the first time unit; the first terminal device copies the PSBCH of the second frequency domain resource set on some symbols of the first time unit to the symbols corresponding to the S-PSS and S-SSS on the first frequency domain resource set and the first time unit.

In combination with the first aspect, in certain implementations of the first aspect, the first signal also includes S-PSS and/or S-SSS, and the symbol position of the S-PSS in the first frequency domain resource set is different from the symbol position of the S-PSS in the second frequency domain resource set.

Based on this implementation, mapping the first signal (i.e., PSBCH) in the above manner on the non-synchronous RB set on the synchronous time unit can ensure that the signals on each symbol on each RB set are different, thereby reducing the PAPR. Furthermore, because the PSBCH on the first frequency domain resource uses the same numbered bits as the PSBCH on the second frequency domain resource, only one cache is needed to store the PSBCH encoded bits to map to different frequency domain resource sets. This implementation further reduces the storage size of the first terminal device and saves costs.

In combination with the first aspect, in certain implementations of the first aspect, the first terminal device determines Mt S-PSS sequences, where the Mt S-PSS sequences are determined by an index of a frequency domain resource set, where Mt is a positive integer not greater than M.

In combination with the first aspect, in some implementations of the first aspect, the Mt S-PSS sequences are determined according to the following method:

S-PSS(i,j)＝(S-PSS(0,j)+c(i,j))mod 2, 0≤j<L-1, 0≤i<Mt-1;

Wherein, L is the length of the S-PSS sequence, S-PSS(0,j) is the main synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth code element in the i-th random sequence, the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the index of the frequency domain resource set, mod represents the modulo operation, and Mt is a positive integer.

It should be noted that here S-PSS(0,j) is the main synchronization signal sequence in the side synchronization signal block used for synchronizing the S-SSB signal.

Optionally, the initial value C _init of c(i,j) satisfies: C _init =SLSSID+i; or, C _init =SLSSID*2 ⁿ +i; or, C _init =SLSSID+i*2 ⁿ ; wherein, i is the S-SSB index or the index of the frequency domain resource, and n is a positive integer, such as a positive integer between 10 and 20, such as 10, 15, 20, etc.

S-PSS(i,j)＝S-PSS(0,j)*(1-2*c(i,j)), 0≤j<L-1;

Wherein, L is the length of the S-PSS sequence, S-PSS(0,j) is the main synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth codeword in the i-th random sequence, and the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the index i of the frequency domain resource set, where i is an integer.

It should be understood that S-PSS(i,j) represents i repeated scrambled S-PSS sequences, S-PSS(0,j) represents the S-PSS sequence at the frequency position of the S-SSB used for synchronization (which can be referred to as S-SSB ARFCN), and i is the S-SSB repetition number index. That is to say, in this implementation, the S-SSBs of non-synchronous frequency points other than the S-SSB used for synchronization are scrambled.

Based on this implementation, a random sequence is generated using parameters related to the index of the frequency domain resource set, and then the random sequence is used to scramble the S-PSS and S-SSS sequences on the non-synchronous frequency points, so that M-1 different S-PSS sequences and M-1 different S-SSS sequences can be obtained. Together with the S-PSS sequence and S-SSS sequence on the original synchronous frequency point, M different S-PSS sequences and M different S-SSS sequences can be obtained respectively. Because these M sequences are different, the PAPR of the time domain signal generated by the signal of these M frequency domain resource sets can be reduced to the greatest extent, thereby increasing the maximum available power during actual transmission and improving the transmission performance.

In combination with the first aspect, in certain implementations of the first aspect, the first terminal device determines Nt S-SSS sequences, where the Nt S-SSS sequences are determined by an index of a frequency domain resource set, where Nt is a positive integer not greater than M.

In combination with the first aspect, in some implementations of the first aspect, the Nt S-SSS sequences are determined according to the following method:

S-SSS(i,j)＝(S-SSS(0,j)+c(i,j))mod 2, 0≤j<L-1, 0≤i<Mt-1;

Where L is the length of the S-SSS sequence, S-SSS(0,j) is the slave synchronization signal sequence in the side synchronization signal block, and c(i,j) represents the i-th The initial value of c(i,j) of the j-th codeword in the random sequence is determined by the identifier of the sideline synchronization signal sequence and/or the index of the frequency domain resource set, and mod represents a modulo operation.

Optionally, the initial value C _init of c(i,j) satisfies: C _init = SLSSID+i; or, C _init = SLSSID*2 ⁿ +i; or, C _init = SLSSID+i*2 ⁿ ; wherein, i is the S-SSB index or the index of the frequency domain resource set, and n is a positive integer, such as a positive integer between 10 and 20, such as 10, 15, 20, etc.

It should be noted that here S-SSS(0,j) is the S-SSB signal used for synchronization from the synchronization signal sequence in the side synchronization signal block.

S-SSS(i,j)＝S-SSS(0,j)*(1-2*c(i,j)), 0≤j<L-1;

Wherein, L is the length of the S-SSS sequence, S-SSS(0,j) is the slave synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth codeword in the i-th random sequence, and the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the index i of the frequency domain resource set, where i is an integer.

It should be understood that S-SSS(i,j) represents i repeated scrambled S-SSS sequences, S-SSS(0,j) represents the S-SSS sequence at the frequency position of the S-SSB (which can be abbreviated as S-SSB ARFCN) used for synchronization, and i is the S-SSB repetition number index. That is to say, in this implementation, the S-SSBs of non-synchronous frequency points other than the S-SSB used for synchronization are scrambled.

In an embodiment of the present application, the M frequency domain resource sets respectively include a first frequency domain resource set (a frequency domain resource set for synchronization) and M-1 second frequency domain resource sets (a frequency domain resource set for non-synchronization), and each frequency domain resource set includes an S-SSB. The frequency domain resource set and the S-SSB correspond one-to-one, that is, the frequency domain resource set is numbered as the index i of the frequency domain resource set, and can also be used as the index of the S-SSB, that is, the S-SSB repetition number index.

Based on this implementation, a random sequence is generated using parameters related to the index of the frequency domain resource set, and then the random sequence is used to scramble the S-PSS and S-SSS sequences on the non-synchronous frequency points, so that M-1 different S-PSS sequences and M-1 different S-SSS sequences can be obtained. Together with the S-PSS sequence on the original synchronous frequency point and the S-SSS sequence on the original synchronous frequency point, M different S-PSS sequences and M different S-SSS sequences can be obtained respectively. Because these M sequences are different, the PAPR of the time domain signal generated by the signal number of these M frequency domain resource sets can be reduced to the greatest extent, thereby increasing the maximum available power during actual transmission and improving the transmission performance.

In combination with the first aspect, in certain implementations of the first aspect, the first terminal device determines M S-SSS sequences, and the M S-SSS sequences correspond one-to-one to the indexes of M frequency domain resource sets.

Based on this implementation method, mapping the first signal (i.e., PSBCH, S-SSS, and S-PSS) in the above-mentioned manner on the asynchronous RB set on the synchronous time unit can ensure that the signals on each symbol on each RB set are different, thereby reducing the PAPR.

In combination with the first aspect, in some implementations of the first aspect, the first signal includes at least one side primary synchronization signal S-PSS.

In combination with the first aspect, in certain implementations of the first aspect, the first signal includes M-1 sideways main synchronization signals S-PSS, and the first terminal device scrambles the M-1 S-PSSs according to the M S-SSS sequences.

In combination with the first aspect, in some implementations of the first aspect, the first terminal device determines M S-SSS sequences, including: the first terminal device determines M S-SSS sequences based on an identifier of a sidelink synchronization signal sequence (sidelinksynchronizationsignal identifier, SLSSID_n) in a second frequency domain resource set, where 1≤i≤M is an integer.

In combination with the first aspect, in certain implementations of the first aspect, SLSSID_i in the i-th frequency domain resource set satisfies: SLSSID_i = (RBS _i -1)*Ms/M+SLSSID_n; or, SLSSID_i = (RBS _i )*Ms/M+SLSSID_n; wherein RBS _i is the index of the i-th frequency domain resource set, i is an integer greater than or equal to 1 and less than or equal to M, the value of SLSSID_n is any integer in [0,1,…,Ms/M], and Ms is a positive integer not less than M.

Based on this implementation method, on the asynchronous RB set on the synchronous time unit, it is ensured that the S-SSS sequence on each frequency domain resource set is different, and then the S-PSS on M-1 asynchronous RB sets is scrambled based on the M S-SSS sequences, so that the S-PSS sequence on each RB set is also different, thereby reducing PAPR.

In combination with the first aspect, in some implementations of the first aspect, the first frequency domain resource set is a first resource block set, and the second frequency domain resource set is a second resource block set.

In combination with the first aspect, in certain implementations of the first aspect, the first frequency domain resource set and the second frequency domain resource set are located in the same resource block set.

Based on this implementation method, two application scenarios are provided, namely, the first frequency domain resource set and the second frequency domain resource set are located in different resource block sets, or the first frequency domain resource set and the second frequency domain resource set are located in the same resource block set, and resource frequency division is performed.

In combination with the first aspect, in some implementations of the first aspect, the sideline synchronization signal block includes a first sideline synchronization signal block and a second sideline synchronization signal block. The first side row synchronization signal block is located outside the resource pool, and the second side row synchronization signal block is located inside the resource pool or outside the resource pool.

In combination with the first aspect, in some implementations of the first aspect, the first sideline synchronization signal block accesses the channel using a short control signaling method, and the second sideline synchronization signal block accesses the channel using a sensing method.

In combination with the first aspect, in certain implementations of the first aspect, accessing the channel using short control signaling includes: accessing the channel without using a sensing method, or accessing the channel using a type 2A channel access method.

In combination with the first aspect, in certain implementations of the first aspect, accessing the channel by means of short control signaling satisfies: a duty cycle of sending the first side synchronization signal does not exceed 1/20.

In combination with the first aspect, in certain implementations of the first aspect, the starting and ending positions of the frequency domain resources occupied by the PSBCH in the side synchronization signal block are: subcarrier 0 to subcarrier 131; the starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS in the side synchronization signal block are: subcarrier 2 to subcarrier 128.

In combination with the first aspect, in certain implementations of the first aspect, the first signal is determined by the index of the frequency domain resource set, including: the first terminal device generates a first sequence, an integer of 1≤i≤M, based on the index of the i-th frequency domain resource set; the first terminal device scrambles the PSBCH on the i-th frequency domain resource set on the first time unit according to the first sequence.

Exemplarily, the scrambling for PSBCH may be determined according to the following method:

in, represents the bit after PSBCH scrambling in the i-th frequency domain resource set, b(0,n) represents the frequency position of the S-SSB (S-SSB ARFCN) used for synchronization before modulation, and the bit transmitted on the physical side link broadcast channel, M _bit represents the number of bits before PSBCH scrambling, c(i,n) represents the symbol n of the i-th scrambled sequence, and mod represents the modulo operation. Optionally, the value of c(i,n) is 0 or 1.

Based on this implementation, a random sequence is generated using parameters related to the index of the frequency domain resource set, and then the random sequence is used to scramble the information carried in the PSBCH on the non-synchronous frequency point, and M-1 different scrambled PSBCHs can be used. Adding the unscrambled PSBCH on the original synchronous frequency point, M different PSBCHs can be obtained. Because the bits transmitted on these M PSBCHs are different, the PAPR of the PSBCH transmitted in these M frequency domain resource sets can be reduced to the greatest extent, thereby increasing the maximum available power during actual transmission and improving the transmission performance.

In combination with the first aspect, in certain implementations of the first aspect, the first signal is determined by the index of the frequency domain resource set, including: the first terminal device generates a first sequence according to the index of the first frequency domain resource set; the first terminal device scrambles the PSBCH on the first frequency domain resource set on the first time unit according to the first sequence.

In combination with the first aspect, in certain implementations of the first aspect, the first sequence is a random sequence, and the initial value of the random sequence is determined by the identifier of the side synchronization signal sequence and/or the index of the i-th frequency domain resource set, or; the first sequence is a random sequence, and the initial value of the random sequence is determined by the identifier of the side synchronization signal sequence and/or the index of the first frequency domain resource set.

In combination with the first aspect, in some implementations of the first aspect, the frequency domain resource set includes any one of the following:

The frequency domain resource set is a resource block set included in the resource pool;

The frequency domain resource set is a resource block set included in the channel occupancy time COT of the first terminal device;

The M frequency domain resource sets are located in one synchronization resource block set, and the synchronization resource block set includes the second frequency domain resource set and M-1 first frequency domain resource sets;

The M frequency domain resource sets are located in M1 frequency domain resource sets in a resource pool, wherein each resource block set includes M2 frequency domain resource sets; or,

The M frequency domain resource sets are M1 frequency domain resource sets located on the channel occupancy time COT of the first terminal device, wherein each resource block set includes M2 frequency domain resource sets.

In combination with the first aspect, in some implementations of the first aspect, the index of the frequency domain resource set includes any one of the following:

The index of the M frequency domain resource sets determined by the first terminal device;

An index of a primary synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a primary synchronization signal in a resource block set;

An index of a slave synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a slave synchronization signal in a resource block set;

The index of the PSBCH in the resource block set or the index of the frequency domain resource set occupied by the PSBCH in the resource block set.

In combination with the first aspect, in certain implementations of the first aspect, the index of the i-th frequency domain resource set is determined based on any one of the following: the index of the i-th frequency domain resource set; the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set; the absolute value of the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set; the sum of the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set and M; the parameter value configured for the frequency domain resource set.

Based on this implementation, different sequences can be used to scramble the PSBCH, which can solve the problem of signal overlap on multiple frequency domain resource sets. In particular, the same signal on the symbol where the PSBCH is located between multiple non-synchronous RB sets may lead to problems such as limited transmit power.

In combination with the first aspect, in certain implementations of the first aspect, the PSBCH includes a reference signal for PSBCH demodulation, the reference signal for PSBCH demodulation is generated by a second random sequence, and the initial value of the second random sequence is determined by an identifier of a side synchronization signal sequence and/or an index of a first frequency domain resource set.

In combination with the first aspect, in some implementations of the first aspect, the initial value of the random sequence and/or the first sequence used to scramble the S-PSS, S-SSS and/or PSBCH in the i-th frequency domain resource set is determined according to any one of the following expressions:

or,

Wherein, c _init (i) is the initial value of the random sequence, i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, k is an integer greater than or equal to 1, q is an integer greater than or equal to 1, Indicates the identifier of the side synchronization signal sequence, floor(x) indicates that x is rounded down. Optionally, the value of k can be 10, 20, 30, etc. Optionally, the value of q can be 10, 20, 21, 30, etc. Optionally, (q+k)≤31, for example, the value of (q+k) is any integer from 20 to 31, such as 20, 21, 25, 30 or 31, etc. Optionally, M is the M frequency domain resource sets determined by the first terminal device. Optionally, q＝20 or 21, and the 31-bit shift register can be shifted as much as possible. The remaining 20 or 21 bits of the 31 bits other than the occupied 10 bits are randomized as much as possible to increase the difference of the sequence, thereby further reducing the PAPR.

It should be understood that by using parameters related to the index of the frequency domain resource set to generate a random sequence, and then using the random sequence to generate the DMRS transmitted in the PSBCH on the non-synchronized frequency point, M different PSBCH DMRS sequences can be obtained. Therefore, the PAPR of the DMRS of the PSBCH transmitted in the M frequency domain resource sets can be reduced to the greatest extent, thereby increasing the maximum available power during actual transmission and improving the transmission performance.

In a second aspect, a communication method is provided, which can be executed by a second terminal device (e.g., UE2), or can also be executed by a chip or circuit for the second terminal device, which is not limited in this application. For ease of description, the following is an example of execution by the second terminal device.

The method includes: the second terminal device receives indication information from the first terminal device, the indication information indicates a first frequency domain resource set, and/or a second frequency domain resource set; the second terminal device receives a side synchronization signal block on the second frequency domain resource set on the first time unit; wherein the second frequency domain resource set includes frequency domain resources of side synchronization signal resources, the first frequency domain resource set is the other M-1 frequency domain resource sets among the M frequency domain resource sets except the second frequency domain resource set, the M frequency domain resource sets are determined by the first terminal device, and M is an integer greater than 1.

According to the solution provided in the present application, the second terminal device can receive the indication information of the first terminal device, and determine the first frequency domain resource set and/or the second frequency domain resource set based on the indication information, and receive the side synchronization signal block on the second frequency domain resource set on the first time unit, to ensure that the signals sent by the first frequency domain resource set and the second frequency domain resource set on the first time unit are different, so as to avoid the influence of the high peak-to-average ratio and thereby improve the system transmission performance.

In combination with the second aspect, in certain implementations of the second aspect, the second terminal device receives a first signal on a first frequency domain resource set on a first time unit, the first signal includes a PSBCH, and the first signal is determined by an index of the frequency domain resource set.

In combination with the second aspect, in some implementations of the second aspect, the first signal also includes S-PSS and/or S-SSS.

In combination with the second aspect, in certain implementations of the second aspect, all first signals are PSBCHs.

Based on this implementation method, mapping the first signal (i.e., PSBCH) on the asynchronous RB set on the synchronous time unit can ensure that the signals on the S-PSS symbol and the S-SSS symbol on each RB set are different, thereby reducing the PAPR.

In combination with the second aspect, in certain implementations of the second aspect, the first signal also includes S-PSS and/or S-SSS, and the symbol position of the S-PSS in the first frequency domain resource set is different from the symbol position of the S-PSS in the second frequency domain resource set.

In combination with the second aspect, in some implementations of the second aspect, the first frequency domain resource set is a first resource block set, and the second frequency domain resource set is a second resource block set.

In combination with the second aspect, in certain implementations of the second aspect, the first frequency domain resource set and the second frequency domain resource set are located in the same resource block set.

In combination with the second aspect, in certain implementations of the second aspect, the sideline synchronization signal block includes a first sideline synchronization signal block and a second sideline synchronization signal block, the first sideline synchronization signal block is located outside the resource pool, and the second sideline synchronization signal block is located inside the resource pool or outside the resource pool.

In combination with the second aspect, in some implementations of the second aspect, the first sideline synchronization signal block accesses the channel using a short control signaling method, and the second sideline synchronization signal block accesses the channel using a sensing method.

In combination with the second aspect, in certain implementations of the second aspect, accessing the channel using short control signaling includes: accessing the channel without using a sensing method, or accessing the channel using a type 2A channel access method.

In combination with the second aspect, in certain implementations of the second aspect, accessing the channel by means of short control signaling satisfies: a duty cycle of sending the first side synchronization signal does not exceed 1/20.

In combination with the second aspect, in certain implementations of the second aspect, the starting and ending positions of the frequency domain resources occupied by the PSBCH in the side synchronization signal block are: subcarrier 0 to subcarrier 131; the starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS in the side synchronization signal block are: subcarrier 2 to subcarrier 128.

In conjunction with the second aspect, in some implementations of the second aspect, the frequency domain resource set includes any one of the following:

In conjunction with the second aspect, in some implementations of the second aspect, the index of the frequency domain resource set includes any one of the following:

In combination with the second aspect, in certain implementations of the second aspect, the index of the i-th frequency domain resource set is determined based on any one of the following: the index of the i-th frequency domain resource set; the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set; the absolute value of the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set; the sum of the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set and M; the parameter value configured for the frequency domain resource set.

Based on this implementation, different sequences can be used to scramble the PSBCH, which can solve the problem of identical signals on multiple frequency domain resource sets, especially the problem that the identical signals on the symbols where the PSBCH is located between multiple asynchronous RB sets may lead to problems such as limited transmission power.

In combination with the second aspect, in certain implementations of the second aspect, the PSBCH includes a reference signal for PSBCH demodulation, the reference signal for PSBCH demodulation is generated by a second random sequence, and the initial value of the second random sequence is determined by the identifier of the side synchronization signal sequence and/or the index of the first frequency domain resource set.

In combination with the second aspect, in some implementations of the second aspect, the initial value of the random sequence and/or the first sequence used to scramble the S-PSS, S-SSS and/or PSBCH in the i-th frequency domain resource set satisfies any one of the following relationships:

or,

Wherein, c _init (i) is the initial value of the random sequence, i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, k is an integer greater than or equal to 1, q is an integer greater than or equal to 1, Indicates the identifier of the side synchronization signal sequence, floor(x) indicates that x is rounded down. Optionally, the value of k can be 10, 20, 30, etc. Optionally, the value of q can be 10, 20, 21, 30, etc. Optionally, (q+k)≤31, for example, the value of (q+k) is any integer between 20 and 31, such as 20, 21, 25, 30 or 31, etc. Optionally, q＝20 or 21, you can shift as much as possible in the 31-bit shift register The remaining 20 or 21 bits of the 31 bits other than the occupied 10 bits are randomized as much as possible to increase the difference of the sequence, thereby further reducing the PAPR. Optionally, M is a set of M frequency domain resources determined by the first terminal device.

In a third aspect, a communication method is provided, which can be executed by a first terminal device (e.g., UE1), or can also be executed by a chip or circuit for the first terminal device, which is not limited in this application. For ease of description, the following description is taken as an example of execution by the first terminal device.

The method includes: the first terminal device obtains the channel occupancy time COT, the COT includes a side synchronization signal resource, the side synchronization signal resource includes a first synchronization resource and/or a second synchronization resource, the first synchronization resource is used for the first terminal device to send a side synchronization signal, and the second synchronization resource is used for the first terminal device to receive a side synchronization signal; the first terminal device sends first information to the second terminal device, and the first information indicates the side synchronization signal resource.

According to the solution provided in the present application, the public S-SSB resources are used as part of the COT of the first terminal device, and the receiving and sending status of the S-SSB resources is indicated, which can avoid interruption of the first terminal device, improve system transmission performance, reduce transmission delay, etc.

In combination with the third aspect, in certain implementations of the third aspect, the sideline synchronization signal resource includes a first synchronization resource and a second synchronization resource; or, the sideline synchronization signal resource includes a first synchronization resource and two second synchronization resources.

Exemplarily, there are N side synchronization signal resources, and the value of N can be 2 or 3.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device obtains Nc candidate synchronization resources from the first synchronization resource and/or the second synchronization resource, and the Nc candidate synchronization resources are configured, pre-configured, or reserved in the resource pool through signaling, and Nc is less than or equal to N.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device determines Na synchronization resources in the first synchronization resource or the second synchronization resource that overlap with the COT, respectively, and Na is less than or equal to Nc.

Optionally, that synchronization resource is a sideline synchronization signal resource indicated by the first information.

In combination with the third aspect, in certain implementations of the third aspect, part or all of the Na synchronization resource indicated by the first information is the first synchronization resource or the second synchronization resource.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device sends a sideline synchronization signal on a first synchronization resource; and/or the first terminal device receives a sideline synchronization signal on one or more second synchronization resources.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device instructs the second terminal device to send a sideline synchronization signal on one or more second synchronization resources.

In combination with the third aspect, in certain implementations of the third aspect, there is no GAP before the first synchronization resource in which the first terminal device sends a sideline synchronization signal, and the first terminal device includes a GAP of a first duration before receiving or instructing the second terminal device to send a second synchronization resource in which the sideline synchronization signal is sent.

It should be understood that the GAP is not used to send or receive data or signals. The GAP of the first duration is predefined, configured or preconfigured. The size of the GAP of the first duration may be 16 μs or 25 μs, etc.

In combination with the third aspect, in certain implementations of the third aspect, the first information is COT shared information sent by the first terminal device.

In combination with the third aspect, in certain implementations of the third aspect, the first information includes P bits, and the i-th bit of the P bits is used to indicate that the i-th sideline synchronization signal resource among N sideline signal synchronization resources is the first synchronization resource or the second synchronization resource; or, the first information includes: ceil(log ₂ (N)) bits, used to indicate the first synchronization resource or the second synchronization resource among the N sideline synchronization signal resources, where ceil(x) represents rounding up x.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device sends first indication information to the second terminal device, including: the first terminal device sends side control information to the second terminal device, the side control information includes the first indication information; or, the first terminal device sends a media access control element MAC CE to the second terminal device, the MAC CE includes the first indication information; or, the first terminal device sends side control information and MAC CE to the second terminal device, the side control information and MAC CE include the first indication information.

In combination with the third aspect, in certain implementations of the third aspect, COT occupies M frequency domain resource sets, where M is an integer greater than 1; when M is greater than 1, the M frequency domain resource sets include a first frequency domain resource set and a second frequency domain resource set, the second frequency domain resource set includes frequency domain resources for sidelink synchronization signal resources, and the first frequency domain resource set is the other M-1 frequency domain resource sets in the M frequency domain resource sets except the second frequency domain resource set; or, the M frequency domain resource sets include the first frequency domain resource set, the first frequency domain resource set is the other M-1 frequency domain resource sets in the M frequency domain resource sets except the second frequency domain resource set, and the second frequency domain resource set includes frequency domain resources for sidelink synchronization signal resources.

In combination with the third aspect, in some implementations of the third aspect, the first frequency domain resource set of the first terminal device in the first time unit The sending data or the signal associated with the sideline synchronization signal block is closed, and the first time unit is the time unit where the first synchronization resource in the second frequency domain resource set is located.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device obtains second information indicating that a first frequency domain resource set on a first time unit is used to send data, or a signal associated with a side synchronization signal block.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device sends third information to the second terminal device, and the third information indicates that the first frequency domain resource set on the second time unit is used for the second terminal device to send or receive data, or a signal associated with a side synchronization signal block, and the second time unit is a time unit where the second synchronization resource in the second frequency domain resource set is located.

In combination with the third aspect, in certain implementations of the third aspect, the first terminal device obtains fourth information, and the fourth information indicates that the first frequency domain resource set on the second time unit is used to receive data, or a signal associated with a side synchronization signal.

In a fourth aspect, a communication method is provided, which can be executed by a second terminal device (e.g., UE2), or can also be executed by a chip or circuit for the second terminal device, which is not limited in this application. For ease of description, the following is an example of execution by the second terminal device.

The method includes: a second terminal device receives first information from a first terminal device, the first information indicates a sideline synchronization signal resource, the sideline synchronization signal resource includes a first synchronization resource and/or a second synchronization resource, the first synchronization resource is used by the first terminal device to send a sideline synchronization signal, the second synchronization resource is used by the first terminal device to receive a sideline synchronization signal, and the sideline synchronization signal resource is included in the COT obtained by the first terminal device; the second terminal device receives or sends a sideline synchronization signal according to the first information.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the sideline synchronization signal resource includes a first synchronization resource and a second synchronization resource; or, the sideline synchronization signal resource includes a first synchronization resource and two second synchronization resources.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the second terminal device receives a sideline synchronization signal from the first terminal device on the first synchronization resource; and/or the second terminal device sends a sideline synchronization signal to the first terminal device on the second synchronization resource.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the first information includes: P bits, the i-th bit of the P bits is used to indicate that the i-th sideline synchronization signal resource among the N sideline synchronization signal resources is the first synchronization resource or the second synchronization resource; or, the first information includes: ceil(log ₂ (N)) bits, used to indicate the first synchronization resource or the second synchronization resource among the N sideline synchronization signal resources, where ceil(x) represents rounding up x.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the second terminal device receives first indication information from the first terminal device, including: the second terminal device receives side control information from the first terminal device, the side control information includes the first indication information; or, the second terminal device receives a media access control element MAC CE from the first terminal device, the MAC CE includes the first indication information; or, the second terminal device receives side control information and MAC CE from the first terminal device, the side control information and MAC CE include the first indication information.

In combination with the fourth aspect, in certain implementations of the fourth aspect, COT occupies M frequency domain resource sets, where M is an integer greater than 1; when M is greater than 1, the M frequency domain resource sets include a first frequency domain resource set and a second frequency domain resource set, the second frequency domain resource set includes frequency domain resources of side synchronization signal resources, and the first frequency domain resource set is the other M-1 frequency domain resource sets in the M frequency domain resource sets except the second frequency domain resource set; or, the M frequency domain resource sets include the first frequency domain resource set, the first frequency domain resource set is the other M-1 frequency domain resource sets in the M frequency domain resource sets except the second frequency domain resource set, and the second frequency domain resource set includes frequency domain resources of side synchronization signal resources.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the second terminal device receives data from the first terminal device, or a signal associated with a side synchronization signal block, on a first frequency domain resource set on a first time unit, and the first time unit is a time unit where the first synchronization resource in the second frequency domain resource set is located.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the second terminal device receives third information from the first terminal device, and the third information indicates that the first frequency domain resource set on the second time unit is used for the second terminal device to send or receive data, or a signal associated with a side synchronization signal block, and the second time unit is a time unit where the second synchronization resource in the second frequency domain resource set is located.

It should be noted that the timing of sending the third information (eg, COT sharing indication information) needs to be at least before the time unit where the second synchronization resource is located.

In a fifth aspect, a communication method is provided, which can be executed by a first terminal device (e.g., UE1), or can also be executed by a chip or circuit for the first terminal device, which is not limited in this application. For ease of description, the following is an example of execution by the first terminal device.

The method includes: the first terminal device determines a sideline synchronization signal block and first data, and the sideline synchronization signal block and the first data are located on different frequency domain resources on a first time unit; the first terminal device determines to send or receive the sideline synchronization signal block and/or the first data on the first time unit according to the priority of the sideline synchronization signal block and/or the first data.

According to the solution provided in the present application, the first terminal device determines whether to transmit the first data and the side synchronization signal block concurrently based on the relationship between the relative priorities of the first data and the side synchronization signal block.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first time unit is a time domain resource of the first resource, the first terminal device determines to send or receive a side synchronization signal block on the first time unit.

Exemplarily, the first resource is configured in the resource pool for sending or receiving a side synchronization signal block, which may be a configured S-SSB resource, and the first synchronization signal block is sent on the first resource. The second resource may be a candidate synchronization resource, such as a candidate S-SSB resource, and the second synchronization signal block is sent on the second resource.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first time unit is a time domain resource of the second resource, the first terminal device determines to send or receive a side synchronization signal block and/or first data on the first time unit based on the usage of the first resource.

In combination with the fifth aspect, in certain implementations of the fifth aspect, the side synchronization signal block and the first data are to be sent by the first terminal device in the first time unit.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first terminal device successfully sends the first sideline synchronization signal block on the first resource, the first terminal device determines to send the first data on the first time unit.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first terminal device fails to successfully send the first side synchronization signal block on the first resource, the first terminal device determines to send the side synchronization signal block and/or the first data on the first time unit based on the priority of the side synchronization signal block and/or the first data.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first terminal device fails to successfully send the first side synchronization signal block on the first resource, the first terminal device determines to send the side synchronization signal block and/or the first data on the first time unit based on the first indication information.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when any one of the following conditions is met, the first terminal device determines to send a side synchronization signal block at the first time unit: the priority of the side synchronization signal block is higher than the priority of the first data; the priority of the side synchronization signal block is higher than the configured first priority threshold; the priority of the side synchronization signal block is higher than the priority of the first data, and the priority of the side synchronization signal block is higher than the configured first priority threshold; the first indication information is used to indicate the sending of the side synchronization signal block; the first indication information is used to indicate the sending of the side synchronization signal block and the first data.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when any one of the following conditions is met, the first terminal device determines to send the first data on the first time unit: the priority of the first data is higher than the priority of the sideline synchronization signal block; the priority of the first data is higher than the configured first priority threshold; the priority of the first data is higher than the priority of the sideline synchronization signal block, and the priority of the first data is higher than the configured first priority threshold; the first indication information is used to indicate the sending of the first data; the first indication information is used to indicate the sending of the sideline synchronization signal block and the first data.

In combination with the fifth aspect, in certain implementations of the fifth aspect, the side synchronization signal block is to be sent by the first terminal device at the first time unit, and the first data is to be received by the first terminal device at the first time unit; or, the side synchronization signal block is to be received by the first terminal device at the first time unit, and the first data is to be sent by the first terminal device at the first time unit.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first terminal device does not send or receive the first side synchronization signal block on the first resource, the first terminal device determines to send the side synchronization signal block and/or the first data on the first time unit based on the priority of the side synchronization signal block and/or the first data.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when the first terminal device does not send or receive the first side synchronization signal block on the first resource, the first terminal device determines to send the side synchronization signal block and/or the first data on the first time unit based on the second indication information.

In combination with the fifth aspect, in some implementations of the fifth aspect, when any one of the following conditions is met, the first terminal device determines to send or receive a sideline synchronization signal block on the first time unit: the priority of the sideline synchronization signal block is higher than the priority of the first data; the priority of the sideline synchronization signal block is higher than the configured first priority threshold; the priority of the sideline synchronization signal block is higher than the priority of the first data, and the priority of the sideline synchronization signal block is higher than the configured first priority threshold; the second indication information is used to indicate sending the sideline synchronization signal block; The second indication information is used to indicate the sending side line synchronization signal block and the first data.

In combination with the fifth aspect, in certain implementations of the fifth aspect, when any one of the following conditions is met, the first terminal determines to send or receive the first data on the first time unit: the priority of the first data is higher than the priority of the sideline synchronization signal block; the priority of the first data is higher than the configured first priority threshold; the priority of the first data is higher than the priority of the sideline synchronization signal block, and the priority of the first data is higher than the configured first priority threshold; the second indication information is used to indicate the sending of the first data; the second indication information is used to indicate the sending of the sideline synchronization signal block and the first data.

Based on this implementation method, the first terminal device determines whether to prioritize the first data or the side synchronization signal block according to the usage of the first resource and the relationship between the relative priorities of the first data and the side synchronization signal block. This method can ensure that the terminal device prioritizes more important information and reduce the impact on the system.

In a sixth aspect, a communication device is provided, including: a processing unit, configured to determine M frequency domain resource sets, the M frequency domain resource sets including a first frequency domain resource set and a second frequency domain resource set, the second frequency domain resource set including frequency domain resources of sidelink synchronization signal resources, the first frequency domain resource set being other M-1 frequency domain resource sets except the second frequency domain resource set, where M is an integer greater than 1;

The transceiver unit is used to send a side synchronization signal block and a first signal in a first time unit. The side synchronization signal block is located in a second frequency domain resource set, and the first signal is located in a first frequency domain resource set. The first signal includes a physical side broadcast channel PSBCH, and the first signal is determined by an index of the frequency domain resource set.

The transceiver unit can perform the reception and transmission processing in the first, third and fifth aspects mentioned above, and the processing unit can perform other processing except reception and transmission in the first, third and fifth aspects mentioned above.

In the seventh aspect, a communication device is provided, including: a transceiver unit, used to receive indication information from a first terminal device, the indication information indicating a first frequency domain resource set, and/or a second frequency domain resource set; a processing unit, used to determine the first frequency domain resource set, and/or the second frequency domain resource set according to the indication information; the transceiver unit is also used to receive a sidelink synchronization signal block on the second frequency domain resource set on the first time unit; wherein the second frequency domain resource set includes frequency domain resources of sidelink synchronization signal resources, the first frequency domain resource set is M-1 frequency domain resource sets among M frequency domain resource sets excluding the second frequency domain resource set, the M frequency domain resource sets are determined by the first terminal device, and M is an integer greater than 1.

The transceiver unit can perform the receiving and sending processing in the second and fourth aspects mentioned above, and the processing unit can perform other processing except receiving and sending in the second and fourth aspects mentioned above.

In an eighth aspect, a communication device is provided, comprising a transceiver, a processor and a memory, wherein the processor is used to control the transceiver to receive and send signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes a method in any possible implementation of the first to fifth aspects above.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

Optionally, the communication device also includes a transmitter (transmitter) and a receiver (receiver).

In a ninth aspect, a communication system is provided, comprising a first terminal device and a second terminal device.

In the tenth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program or code, and when the computer program or code is run on a computer, the computer executes a method in any possible implementation of the first to fifth aspects above.

In the eleventh aspect, a chip is provided, comprising at least one processor, wherein the at least one processor is coupled to a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device equipped with the chip system executes a method in any possible implementation of the first to fifth aspects above.

The chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

In a twelfth aspect, a computer program product is provided, the computer program product comprising: a computer program code, when the computer program code is executed by a device, the device executes a method in any possible implementation of the first to fifth aspects above.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 and FIG. 2 are schematic diagrams of wireless communication systems applicable to embodiments of the present application.

FIG3 shows a schematic diagram of reserved resources.

FIG4 shows a schematic diagram of a side synchronization signal block S-SSB interruption UE1COT.

FIG5 is a flow chart of a communication method 500 provided in an embodiment of the present application.

FIG6 is a schematic diagram of a UE1COT provided in an embodiment of the present application.

FIG. 7 is a schematic diagram of another UE1COT provided in an embodiment of the present application.

Figure 8 shows a schematic diagram of mapping the first signal to the asynchronous resource block sets RB sets of UE1COT.

FIG. 9 is a flow chart of a communication method 900 provided in an embodiment of the present application.

Figure 10 is a schematic diagram of mapping the first signal to the synchronous time slot where the asynchronous RB sets of UE1COT are located provided by an embodiment of the present application.

Figure 11 is a schematic diagram of mapping the first signal to the synchronous time slot where the asynchronous RB sets of another UE1COT provided in an embodiment of the present application.

Figure 12 is a schematic diagram of mapping the first signal to the synchronous time slot where the asynchronous RB sets of another UE1COT provided in an embodiment of the present application.

Figure 13 is a schematic diagram of mapping the first signal to the synchronous time slot where the asynchronous RB sets of another UE1COT provided in an embodiment of the present application.

FIG. 14 is a flow chart of a communication method 1400 provided in an embodiment of the present application.

FIG. 15 is a schematic diagram of the structure of a communication device 1000 provided in an embodiment of the present application.

FIG. 16 is a schematic diagram of the structure of a communication device 2000 provided in an embodiment of the present application.

FIG. 17 is a schematic diagram of the structure of a chip system 3000 provided in an embodiment of the present application.

Figure 18 is a schematic diagram of sharing UE1COT with other synchronization source UEs for sending S-SSB synchronization resources provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

The technical solution provided in this application can be applied to various communication systems, such as: the fifth generation (5th generation, 5G) or new radio (new radio, NR) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, etc. The technical solution provided in this application can also be applied to future communication systems, such as the sixth generation (6th generation, 6G) mobile communication system. The technical solution provided in this application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (machine type communication, MTC), and Internet of things (IoT) communication system or other communication systems.

As an example, V2X communication may include: vehicle-to-vehicle (V2V) communication, vehicle-to-roadside infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-network (V2N) communication. V2V refers to communication between vehicles. V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers, etc.). V2I refers to communication between vehicles and infrastructure, such as roadside units (RSU) or network equipment. Among them, RSU includes two types: terminal-type RSU, which is in a non-mobile state because it is located on the roadside and does not need to consider mobility; base station-type RSU, which can provide timing synchronization and resource scheduling for vehicles communicating with it. V2N refers to communication between vehicles and network equipment. It can be understood that the above is an exemplary description and the embodiments of the present application are not limiting. For example, V2X may also include V2X communications based on the NR system of the current 3GPP Rel-16 and subsequent versions.

The terminal device in the embodiment of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device.

The terminal device may be a device that provides voice/data to users, for example, a handheld device or a vehicle-mounted device with a wireless connection function. At present, some examples of terminals are: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks or terminal devices in future evolved public land mobile communication networks (PLMNs), etc. The application examples are not limited to this.

As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

In the embodiment of the present application, the device for realizing the function of the terminal device, i.e., the terminal device, can be the terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system or a chip, which can be installed in the terminal device. In the embodiment of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, and the network device may also be referred to as an access network device or a wireless access network device, such as a base station. The network device in the embodiment of the present application may refer to a wireless access network (RAN) node (or device) that connects a terminal device to a wireless network. Base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting point (TRP), transmitting point (TP), master station, auxiliary station, multi-standard wireless (motor slide retainer, MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station may also refer to a communication module, a modem or a chip used to be arranged in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device that performs the base station function in D2D, V2X, and M2M communications, a network-side device in a 6G network, and a device that performs the base station function in a future communication system. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a device including a control plane CU node (central unit control plane (central unit-control plane, CU-CP)) and a user plane CU node (central unit user plane (central unit-user plane, CU-UP)) and a DU node.

In the embodiment of the present application, the device for realizing the function of the network device can be a network device, or a device capable of supporting the network device to realize the function, such as a chip system or a chip, which can be installed in the network device. In the embodiment of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network equipment and terminal equipment are located.

It should be noted that the technical solution of the present application is mainly used in the side transmission scenario, and the frequency bands used include but are not limited to unlicensed spectrum, which includes frequency bands near 2.4 GHz and frequency bands near 5.8 GHz. In the embodiment of the present application, the terminal device and the access network device can use unlicensed spectrum resources for wireless communication (for example, transmitting uplink information or transmitting downlink information). The communication system can adopt licensed-assisted access (LAA), dual connectivity (DC), unlicensed assisted access (standalone) technology, etc.

Below, a communication system applicable to an embodiment of the present application is briefly introduced in conjunction with FIG. 1 and FIG. 2 .

Figures 1 and 2 are schematic diagrams of a wireless communication system applicable to an embodiment of the present application. As shown in Figures 1 and 2, the wireless communication system may include at least one terminal device, such as UE1, UE2, UE3, UE4, and UE5 as shown in the figure. Optionally, the wireless communication system may also include at least one network device, such as the network device shown in the figure.

The network device and the terminal device can communicate with each other. If the network device and the terminal device can communicate with each other through the Uu interface, the link between the network device and the terminal device can be recorded as the Uu link. As shown in FIG1(a) or FIG2(a), the network device and UE1 can communicate directly, and as shown in FIG1(b) or FIG2(b), the network device and UE1 can also communicate with each other through UE2; Similarly, the network device and UE2 can communicate directly, and the network device and UE2 can also communicate through UE1. It can be understood that the Uu link represents a connection relationship between the terminal device and the network device, which is a logical concept rather than a physical entity. The main link is only named for distinction, and its specific naming does not limit the scope of protection of this application.

Terminal devices can also communicate with each other. For example, terminal devices can communicate directly with each other, as shown in Figure 1 (a) to Figure 1 (c), Figure 2 (a) to Figure 2 (c), UE1 and UE2 can communicate directly. For another example, terminal devices can communicate with each other through other devices, such as network devices or terminal devices. As shown in Figure 1 (a), UE1 and UE2 can communicate through network devices, and as shown in Figure 1 (d) and Figure 2 (d), UE1 and UE2 can communicate through UE3. The interface for communication between terminal devices can be recorded as a proximity-based services communication 5 (PC5) interface, the link for communication between terminal devices can be recorded as a sidelink SL, and the communication between terminal devices can also be recorded as SL communication. Sidelinks can also be called side links or sidelinks, etc. It can be understood that the sidelink represents a connection relationship between terminal devices and terminal devices, and is a logical concept rather than a physical entity. The side link is named only for distinction, and its specific naming does not limit the protection scope of this application.

Unicast communication can be performed between devices, such as between terminal devices. Unicast means that a sending terminal and a receiving terminal form a unicast connection pair. For example, taking Figure 1 as an example, UE1 and UE2 can perform unicast communication.

Multicast communication can be performed between devices, such as multicast communication can be performed between terminal devices. Multicast means that a sending terminal and at least one receiving terminal form a multicast connection pair. For example, taking Figure 2 as an example, multicast communication can be performed between UE1 and UE2, UE4 and UE5. As shown in Figure 2 (a), the network device and UE1 can communicate directly, and one UE1 can communicate with multiple UEs, such as UE2, UE4 and UE5. When UE1 performs multicast communication with multiple UEs, it can be performed under network coverage, as shown in Figure 2 (a) or Figure 2 (b), or it can be performed without network coverage, as shown in Figure 2 (c) or Figure 2 (d). It can be understood that Figure 2 uses the example of UE1 performing multicast communication with three UEs for illustrative purposes, and there is no limitation to this. For example, UE1 can perform multicast communication with a larger number of UEs.

As an example, SL communication between terminal devices can be used in vehicle networking or intelligent transportation system (ITS), such as V2X communication mentioned above.

Optionally, SL communication between terminal devices can be performed under network coverage or without network coverage. As shown in Figure 1(a) to Figure 1(b) and Figure 2(a) to Figure 2(b), UE1 and other UEs can communicate under network coverage; or, as shown in Figure 1(c) to Figure 1(d) and Figure 2(c) to Figure 2(d), UE1 and other UEs can communicate outside network coverage (out-of-coverage).

Optionally, the configuration information during SL communication between terminal devices, such as the time and frequency resources during SL communication between terminal devices, may be configured or scheduled by the network device, or may be independently selected by the terminal device without restriction.

It is understood that Figures 1 and 2 are simplified schematic diagrams for ease of understanding, and the wireless communication system may also include other network devices or other terminal devices, which are not shown in Figures 1 and 2. The embodiments of the present application may be applicable to any communication scenario in which a transmitting device and a receiving device communicate.

It should be noted that the embodiments of the present application do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it is possible to communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application may be a terminal device, or a functional module in the terminal device that can call and execute the program.

To facilitate understanding of the embodiments of the present application, a brief description of the terms or technologies involved in the present application is first given.

1. Licensed and unlicensed spectrum

The spectrum used by wireless communication systems is divided into two categories, licensed spectrum and unlicensed spectrum. In the licensed spectrum, UE can use spectrum resources based on the scheduling of network equipment. In the unlicensed spectrum, communication devices can use spectrum resources in a competitive manner. SL communication on the unlicensed spectrum can be called SL-U, and NR cellular communication on the unlicensed spectrum can be called NR-U.

In one possible approach, communication devices compete for channels in a listen-before-talk (LBT) manner, thereby using unlicensed spectrum resources.

2. Sidelink unlicensed spectrum (SL-U)

SL-U mainly refers to SL transmission in unlicensed spectrum. For unlicensed spectrum, the standard introduces two access mechanisms including Type 1 and Type 2. Type 1 is used for channel preemption scenarios and requires LBT, that is, monitoring before transmission. The monitoring here can be energy detection, that is, detecting energy at 9μs. If it exceeds the threshold, it means that a UE occupies the resource; otherwise, If it does not exceed the threshold, it means that no UE occupies the resource. Type 2 is used to share the transmission resources grabbed by other UEs through Type 1. For example, UE1 grabs a transmission opportunity within a period of time (called COT) using Type 1. In addition to the transmission time occupied by itself, it can instruct other UEs to use Type 2 to access the remaining transmission opportunities in the COT occupied by UE1.

It should be noted that Type 2 further includes Type 2A and Type 2B. Type 2A means that the channel is occupied 25μs after the transmission of other UEs is completed. That is, by sensing the channel, it is found that no other UE uses it within 25μs, and then the channel can be occupied. Type 2B means that the channel is occupied 16μs after the transmission of other UEs is completed. The difference from Type 2A is 9μs, which is the duration of a sensing time slot.

3. SL resource pool

In NR, SL transmission is based on resource pools. Each resource pool contains one or more subchannels. The frequency domain resources (i.e., the number of physical resource blocks (PRBs)) occupied by each subchannel in the same resource pool are the same, while the frequency domain resources occupied by each subchannel in different resource pools may be different.

Optionally, the resource pool may also include the location and number of time slots occupied for SL transmission in the time domain.

It should be noted that in the embodiment of the present application, the method of determining resources in the resource selection window can be performed on one resource pool or on multiple resource pools, and the present application does not impose any restrictions on this.

It should be understood that a resource pool can be a physical concept or a logical concept. A resource pool includes multiple physical resources, any of which is used to transmit data. Each UE needs to select a resource from the resource pool when transmitting data. The resource determination process includes the following two situations:

(1) The UE is controlled by the network device and selects a resource from the resource pool for data transmission according to the instruction information of the network device, which is also called Mode 1.

(2) The UE autonomously selects a resource from the resource pool for data transmission, also known as Mode 2, that is, the UE has the opportunity to autonomously determine resource determination and resource allocation. The UE can exclude some occupied or highly interfered resources based on the perceived spectrum occupancy and select transmission resources on idle or less interfered resources.

4. Time domain unit and frequency domain unit

Data or information can be carried through time and frequency resources.

In the time domain, the time domain resource may include one or more time domain units (or may also be referred to as time units).

In an embodiment of the present application, a time unit may include several time domain resources. The time domain unit is, for example, a radio frame (RF), and the time domain resources included in the time domain unit are, for example, a subframe, a frame, a half subframe or a half frame, a slot, a mini-slot, a partial slot, or an orthogonal frequency division multiplexing (OFDM) symbol, etc.; or, the time domain unit may also be a collection of one or more time domain resources, for example, the time domain unit is one or more OFDM symbols in a time slot, for example, the number of the one or more is 6, 7, 12 or 14, etc. One or more time units may be continuous or discrete in time.

Optionally, in an embodiment of the present application, the time domain resources may also be referred to as sub-time domain units, or, "time domain resources" and "sub-time domain units" may be the same concept and may be interchangeable.

In addition, the duration of a time slot can be related to the subcarrier spacing. For example, when the subcarrier spacing is 15kHz, the duration of a time slot is 1 millisecond (ms); when the subcarrier spacing is 30kHz, the duration of a time slot is 0.5ms; when the subcarrier spacing is 60kHz, the duration of a time slot is 0.25ms. Similarly, when the subcarrier spacing is 15*2u, the duration of a time slot is 2-u ms, u＝0,1,2,….

In the frequency domain, frequency domain resources may include one or more frequency domain units. A frequency domain unit may be a resource element (RE), or a resource block (RB), or a resource block set (RB set), or a subchannel, or a resource pool, or a bandwidth, or a bandwidth part (BWP), or a carrier, or a channel, or an interlace RB, etc.

5. Priority

The UE may send multiple services at the same time, and the priorities of the multiple services may be different. Therefore, the priority of the UE can also be described as the service priority of the UE. The service priority of the UE is specifically the sending priority of the UE, or the transmission priority of the UE. The sending priority can also be called the transmission priority or simply the priority, and the present invention does not limit this.

Service priority can also be called L1 priority, physical layer priority, priority carried in sidelink control information (SCI), priority corresponding to the physical side link shared channel (PSSCH) associated with SCI, transmission priority, priority for sending PSSCH, priority for resource determination, priority of logical channel, and highest priority of logical channel. Among them, the priority level and priority value may have a certain correspondence, such as priority The higher the level, the lower the corresponding priority value, or the lower the priority level, the lower the corresponding priority value. Taking the higher the priority level, the lower the corresponding priority value as an example, the priority value range can be an integer from 1 to 8 or an integer from 0 to 7. If the priority value range is 1 to 8, then when the priority value is 1, it represents the highest level of priority.

6. Channel access priority class (CAPC)

The priority level and the priority value may have a certain correspondence relationship, for example, a higher priority level corresponds to a lower priority value, or a lower priority level corresponds to a lower priority value. The priority value may range from 1 to 4, and the smaller the value, the higher the priority.

When performing Type 1 transmission, the UE determines the duration of LBT based on different channel access priorities CAPC, as described in Table 4.2.1-1 of TS 37.213. When CAPC is 1, the maximum COT duration that can be occupied is 2 ms. When CAPC is 2, the maximum COT duration that can be occupied is 4 ms. When CAPC is 3 or 4, the maximum COT duration that can be occupied is 6 ms or 10 ms.

7. COT

Channel occupancy refers to the transmission of a UE on one or more channels after performing the channel access process. If a UE obtains the right to use a channel through LBT, the UE can occupy the channel for a period of time, which can be called COT. COT can be a time concept, that is, the time of SL transmission; it can also be a resource concept, that is, the time-frequency resources occupied by SL transmission.

The COT transmission of the UE cannot exceed the maximum channel occupancy time (MCOT), which is denoted as T _mcot,p . For different CAPCs, the value of T _mcot,p is different, as shown in Table 1 or Table 2. Among them, CW _p in Table 1 and Table 2 is the contention window, CW _min,p is the minimum value of the contention window, and CW _max,p is the maximum value of the contention window.

Table 1

Table 2

7. Type of synchronization source

The synchronization source is a timing reference source used to achieve time and frequency synchronization. The type of synchronization source includes at least one of the following: a global navigation satellite system (GNSS), a terminal device synchronized to the GNSS, a network device, a terminal device, etc. Optionally, the network device may be an eNB, and/or a gNB.

The above briefly describes the terms involved in this application, which will not be repeated in the following embodiments. In addition, the above description of terms is only for the sake of ease of understanding, and does not limit the protection scope of the embodiments of this application.

8. Reserve resources

The reserved resources in the embodiments of the present application refer to resources reserved for transmitting data or information, including time domain resources and frequency domain resources. Optionally, the reserved resources can be distributed periodically, and the time interval between two adjacent reserved resources can be called a reservation period, or a resource reservation period, or a resource reservation interval.

FIG3 shows a schematic diagram of reserved resources. As shown in FIG3, R1 is a resource for transmitting the first data (illustrated by a solid line in the figure), including time domain resources and frequency domain resources for the first data, and R2, R3 and R4 are reserved resources corresponding to the first data (illustrated by a dotted line in the figure). It can be understood that FIG3 shows three reserved resources corresponding to the transmission of the first data, but in actual transmission, the first data may only correspond to There may be one or two reserved resources, or there may be four or more reserved resources, which is not limited in this application.

In one example, the reserved resources corresponding to the first data are resources determined according to the frequency domain resources, time domain resources for transmitting the first data, and the reserved period indicated by the SCI corresponding to the first data. is received, and the time slot where the reserved resource corresponding to the first data is Wherein, q is a positive integer, m is the time slot where the first data is located, and P'rsvp_RX is the reservation period of the first data. Optionally, for the reservation period, Prsvp_RX is the reservation period indicated by the SCI of the first data, in milliseconds (ms), and P'rsvp_RX is the reservation period on the logical time slot converted from the reservation period indicated by Prsvp_RX. Optionally, the frequency domain resources in the reserved resources corresponding to the first data are the same as the frequency domain resources of the first data.

Optionally, when the resource to be excluded is a candidate synchronization signal, whether the selection window for sending data includes the resource of the synchronization signal or the candidate synchronization signal is determined based on the period of the synchronization signal or the candidate synchronization signal. At this time, the information for determining the position where the candidate synchronization signal appears in the selection window is the time-frequency position of the synchronization signal or the candidate synchronization signal, and the period of the synchronization signal.

9. Sidelink-synchronization signal block (S-SSB)

Synchronous communication requires that the sender and receiver have synchronous clock signals of the same frequency and phase, or timing information. In some way, such as SSB in NR communication, the sender and receiver establish synchronization, and then send/receive under the control of the synchronous clock. The present application is applicable to sidelink communication scenarios, so the synchronization signals mentioned below are all S-SSBs. In the present application, S-SSB can be referred to as a synchronization signal or a synchronization signal block, etc. It should be understood that the name of S-SSB is only an example and does not constitute any limitation on the technical solution of the present application. Optionally, S-SSB includes: a side master synchronization signal S-PSS, a side slave synchronization signal S-SSS, and a physical side broadcast channel PSBCH. Optionally, the bandwidth of S-SSB is predefined, configured or preconfigured. For example, its bandwidth is 11PRB, or its maximum bandwidth is 20PRB. Optionally, the number of symbols occupied by S-SSB is also predefined, configured or preconfigured. For example, for a normal CP, S-SSB can occupy 13 symbols, and for an extended CP, S-SSB can occupy 13 symbols. For another example, regardless of normal CP or extended CP, S-SSB occupies 4 symbols. Optionally, S-SSB may also include symbols for automatic gain control AGC.

Currently, in unlicensed spectrum, terminal devices need to select physical resources for data transmission in the resource pool. For example, terminal devices can seize channels by listening before talking (LBT), or share resources obtained after other terminal devices seize channels to transmit data. Exemplarily, in SL-U, the S-SSB configured on the resource pool occupies one RB set1, such as 20MHz. If the COT obtained by the terminal device through Type 1 LBT overlaps with the resource position occupied by the configured S-SSB, the COT will be interrupted, thereby affecting the transmission performance. This is because the time unit where the configured S-SSB is located can only be used to send and receive S-SSB, not to transmit data; and other frequency domain resources on the time unit where the S-SSB is located cannot be used to send other signals or channels. Therefore, the resources occupied by the configured S-SSB and all frequency domain resources on the time unit where the configured S-SSB is located need to be vacated from the resource pool for data transmission.

Optionally, for the convenience of description of the present application, in the present application, the S-SSB sent on the ARFCN used for synchronization is referred to as the S-SSB used for synchronization. Optionally, the ARFCN used for synchronization is configured by signaling.

FIG4 shows a schematic diagram of the COT of UE1 interrupted by the side synchronization signal block S-SSB. For ease of description, in an embodiment of the present application, the frequency domain resources (e.g., RB set) including the S-SSB configured on the resource pool are referred to as synchronous RB set. For example, RB set1 in FIG4 (a) and FIG4 (b); other RB sets on the resource pool except the synchronous RB set are referred to as asynchronous RB sets, such as RB set2 in FIG4 (b). Optionally, the configuration signaling includes the number of synchronous resources of the S-SSB on the resource pool, the offset value between the synchronous resources, and the frequency domain position of the synchronous resources. Optionally, the period of the configured S-SSB can be predefined or indicated by the signaling. For example, its period is fixed at 160ms. Optionally, the synchronous RB set includes the time-frequency resources of the complete S-SSB. Optionally, the synchronous RB set and the asynchronous RB set are only for the convenience of description in this specification and do not constitute corresponding limitations. For example, a partial or complete S-SSB can also be sent on an asynchronous RB set. The transmitter of the terminal device may send S-SSB on a synchronous RB set or an asynchronous RB set, and the receiver of the terminal device may receive S-SSB on a synchronous RB set or an asynchronous RB set, and the present invention does not limit this. Optionally, the synchronous RB set may include a complete S-SSB signal within its bandwidth. Optionally, the asynchronous RB set may include a complete or partial S-SSB signal within its bandwidth.

As shown in (a) of Figure 4, the COT of UE1 occupies RB set1, and the frequency domain resource position where the S-SSB configured by the resource pool (for example, including S-SSB1 and S-SSB2) is located is also located in RB set1, and the two overlap in RB set1. Assume that the bandwidth of the RB set1 can be 20MHz, a preset value, or a configured value. Optionally, the RB set1 includes 4 subchannels, and the bandwidth of each subchannel is 5MHz. Therefore, the COT of UE1 will be interrupted, so that UE1 can only transmit data on the RB set1 before the time unit where S-SSB1 is located. Similarly, as shown in (b) of Figure 4, the COT1 of UE1 occupies RB set1 and RB set2, and the frequency domain resource position where the S-SSB configured by the resource pool (for example, including S-SSB1 and S-SSB2) is located is also located in RB set1, and the two overlap in RB set1. Assume that the bandwidth of the RB set1 and RB set2 can be 20MHz, a preset value, or a configured value. Therefore, the COT of UE1 will be interrupted, so that Therefore, UE1 can only transmit data on RB set1 and RB set2 before the time unit where S-SSB1 is located.

It should be noted that FIG4 is only an example given for ease of understanding and should not constitute any limitation on the technical solution of the present application. For example, the number of asynchronous RB sets in FIG4 may be multiple, and the S-SSB resources on the synchronous RB set may be one or more. Optionally, the synchronous RB set may be any one of multiple RB sets on the resource pool, and the present application does not limit this.

It should be understood that when UE1 accesses the channel through Type 1 LBT, it consumes a lot of time and power consumption. Once the access is successful, UE1 should perform side transmission on the obtained COT as much as possible. Based on the situation where the S-SSB of the above resource pool causes the COT of UE1 to be interrupted, in order to ensure the complete transmission of data, UE1 needs to restart the Type 1 LBT process, which will lead to uncertainty in the timing of subsequent data transmission and increase in transmission delay. Moreover, from the perspective of the entire system, considering that the configured S-SSB appears every 160ms, this will cause a significant decrease in the performance and efficiency of the entire system.

In view of this, the present application provides a communication method and device, which uses S-SSB resources as part of UE1COT, thereby avoiding interruption of UE1COT, thereby improving system transmission performance, reducing transmission delay, etc.

In order to facilitate understanding of the embodiments of the present application, the following points are explained:

First, in this application, unless otherwise specified or there is a logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

Second, in this application, "at least one" means one or more, and "more than one" means two or more. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character "/" generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple, respectively.

Third, in the present application, "first", "second" and various numerical numbers (e.g., #1, #2, etc.) indicate distinctions made for ease of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish between different messages, etc., rather than to describe a specific order or sequence. It should be understood that the objects described in this way can be interchanged where appropriate so as to be able to describe solutions other than the embodiments of the present application.

Fourth, in this application, descriptions such as "when...", "in the case of..." and "if" all mean that the device will make corresponding processing under certain objective circumstances, but do not limit the time, nor do they require the device to have a judgment action when implementing it, nor do they mean the existence of other limitations.

Fifth, in this application, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

Sixth, in this application, "used for indication" may include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used for indicating A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must carry A.

The indication method involved in the embodiments of the present application should be understood to include various methods that can enable the party to be indicated to know the information to be indicated. The information to be indicated can be sent as a whole or divided into multiple sub-information and sent separately, and the sending period and/or sending time of these sub-information can be the same or different. The present application does not limit the specific sending method.

The "indication information" in the embodiments of the present application may be an explicit indication, i.e., directly indicated by signaling, or obtained by combining other rules or other parameters or by deduction according to the parameters indicated by the signaling. It may also be an implicit indication, i.e., obtained according to a rule or relationship, or according to other parameters, or by deduction. The present application does not make specific restrictions on this.

Seventh, in this application, "protocol" may refer to a standard protocol in the field of communications, such as 5G protocol, NR protocol, and related protocols used in future communication systems, which are not limited in this application. "Predefined" may include pre-definition. For example, protocol definition. "Preconfiguration" can be implemented by pre-saving corresponding codes, tables, or other methods that can be used to indicate relevant information in the device, and this application does not limit its specific implementation method.

Eighth, in this application, "storage" may refer to storage in one or more memories. The one or more memories may be separately set or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partially separately set and partially integrated in a decoder, a processor, or a communication device. The type of memory may be any form of storage medium, which is not limited in this application.

Ninth, in this application, "communication" can also be described as "data transmission", "information transmission", "data processing", etc. "Transmission" includes "sending" and "receiving". "First terminal device" can be described as "UE1", "second terminal device" can be described as "UE2", and so on, and this application will not emphasize it any more.

Tenth, in the present application, configuration can be signaling configuration, and can also be described as configuration signaling. For example, the signaling configuration includes configuration by signaling sent by the base station, and these signalings can be radio resource control (RRC) messages, downlink control information (DCI), or system information blocks (SIB). Optionally, the signaling configuration can also be configured to the terminal device by pre-configured signaling, or configured to the terminal device in a pre-configured manner. The pre-configuration here is to define or configure the values of the corresponding parameters in advance in a protocol manner, and store them in the terminal device when communicating with the terminal device. The pre-configured message can be modified or updated under the condition that the terminal device is connected to the network. Further optionally, the signaling configuration can limit the values of the relevant parameters or the configuration information to the resource pool sent or received by the terminal device. The resource pool is a collection of resources used for transmission on a specific carrier or bandwidth portion. In an embodiment of the present application, the number M of frequency domain resource sets may be predefined by the standard, configured by a network device/other UE, or preconfigured by the first terminal device at the factory, etc., and the present application does not impose any limitation on this.

The following will describe in detail the S-SSB reservation and indication method provided by the embodiment of the present application in conjunction with the accompanying drawings. The embodiment provided by the present application can be applied to any communication scenario in which a transmitting device and a receiving device communicate, such as the communication system shown in Figures 1 and 2 above.

Fig. 5 is a flow chart of a communication method 500 provided in an embodiment of the present application. As shown in Fig. 5, the method includes the following steps.

S510, the first terminal device obtains the channel occupancy time COT.

In the technical solution of the present application, the first terminal device is a synchronization source. That is, the first terminal device can be used as a terminal device that sends a side synchronization signal block for exemplary description.

Exemplarily, the first terminal device can obtain COT through Type 1 LBT or Type 2. For specific implementation methods, please refer to the current solution for obtaining COT. For the sake of brevity, no further details are given here.

In one possible implementation, the COT includes sideline synchronization signal resources, which include first synchronization resources and/or second synchronization resources. The first synchronization resource is used for the first terminal device to send a sideline synchronization signal, and the second synchronization resource is used for the first terminal device to receive a sideline synchronization signal.

Optionally, the first terminal device sends a sideline synchronization signal on a first synchronization resource; and/or the first terminal device receives a sideline synchronization signal on a second synchronization resource.

Exemplarily, the value of the number N of side synchronization signal resources is 2 or 3. The number of side synchronization signal resources may be configured or pre-configured. For example, when N is 2, there is 1 first synchronization resource (e.g., S-SSB1) and 1 second synchronization resource (e.g., S-SSB2); for another example, when N is 3, there is 1 first synchronization resource (e.g., S-SSB1) and 2 second synchronization resources (e.g., S-SSB2 and S-SSB3), etc., which is not limited in the present application. The periods of S-SSB1, S-SSB2, and S-SSB3 may be the same, but the time domain resources are different, and S-SSB1, S-SSB2, and S-SSB3 are time division resources, and S-SSB1, S-SSB2, and S-SSB3 may be continuous or discontinuous, which is not limited in the present application.

It should be understood that which side synchronization signal resource or resources UE1 uses to send S-SSB or receive S-SSB is relative. Two synchronization resources (for example, the first synchronization resource and the second synchronization resource) are set here to avoid the situation where UE1 cannot receive S-SSB on the same resource when sending S-SSB under the restriction of half-duplex. For example, UE1 can send S-SSB on one of the synchronization resources while receiving S-SSB on other N-1 synchronization resources. Optionally, when UE1 is used in a full-duplex system, or UE1 has full-duplex capability for sending and receiving, the first synchronization resource and the second synchronization resource of the present application may overlap in the time domain and may be the same or different in the frequency domain. Optionally, in one example, the first synchronization resource and the second synchronization resource may be exactly the same, and the present application does not limit this.

Exemplarily, the side synchronization signal resource is used for receiving and/or sending the side synchronization signal, and the side synchronization signal resource can also be called: S-SSB resource, synchronization signal resource, side synchronization signal resource, synchronization resource, side signal synchronization resource, S-SSB Burst, etc. The above names are only examples and should not constitute any limitation on the technical solution of the present application. Among them, the transmission resources of S-SSB (for example, S-SSB1, S-SSB2 or S-SSB3) can appear periodically in the time domain, or can appear in a trigger-based or event-based manner. For periodic S-SSBs, the transmission period can be predefined, configured or preconfigured. For example, the period value is 40ms, 80ms, 160ms, etc.

In the present application, the side signal may be an S-SSB. Among them, the S-SSB includes a master synchronization signal S-PSS, a slave synchronization signal S-SSS and a side broadcast channel PSBCH. Optionally, the S-SSB may be referred to as a synchronization signal, a side synchronization signal, or a side signal, etc. The above names are only examples and should not constitute any limitation on the technical solution of the present application. It should be understood that the S-SSB may be composed of a predetermined number of symbols in the time domain and occupy a preset bandwidth in the frequency domain. For example, the S-SSB includes 14 symbols in the time domain and occupies 20 PRBs in the frequency domain. For another example, the S-SSB includes 13 or 11 symbols in the time domain and occupies 11 PRBs in the frequency domain. The S-SSB may include AGC symbols and/or empty symbols in the time domain, or may not include them. The present application does not impose any restrictions on this.

In a possible implementation, the COT occupies M frequency domain resource sets, the M frequency domain resource sets include a first frequency domain resource set, the second frequency domain resource set includes frequency domain resources of sideline synchronization signal resources, and the first frequency domain resource set is other than the second frequency domain resource set. There are M-1 frequency domain resource sets, where M is an integer greater than 1.

Optionally, when M is greater than 1, the M frequency domain resource sets also include a second frequency domain resource set. For example, the first frequency domain resource set is an asynchronous RB set; the second frequency domain resource set is a synchronous RB set. That is, the COT of UE1 occupies one or more asynchronous RB set(s), and optionally, the COT also includes a synchronous RB set.

In one example, a first terminal device sends data, or a signal associated with a sideline synchronization signal block, on a first frequency domain resource set on a first time unit, where the first time unit is a time unit where a first synchronization resource in a second frequency domain resource set is located.

Exemplarily, the signal associated with the sidelink synchronization signal block may be one or more of a sidelink primary synchronization signal S-PSS, a sidelink slave synchronization signal S-SSS, or a sidelink physical broadcast channel PSBCH.

Optionally, the first terminal device obtains second information, and the second information indicates that the first frequency domain resource set on the first time unit is used to send data, or a signal associated with a side synchronization signal block. Optionally, the second information may be predefined or configured by the base station. Based on the second information, the first terminal device may send data on the first frequency domain resource set on the first time unit, or a signal associated with a side synchronization signal block, thereby avoiding COT interruption of UE1, improving system transmission performance, reducing transmission delay, etc.

In another example, a first terminal device sends third information to a second terminal device, the third information indicating that a first frequency domain resource set on a second time unit is used for the second terminal device to send or receive data, or a signal associated with a side synchronization signal block, and the second time unit is a time unit where a second synchronization resource in the second frequency domain resource set is located.

Optionally, the first terminal device obtains fourth information, and the fourth information is used to indicate that the first frequency domain resource set on the second time unit is used to receive data, or a signal associated with a side synchronization signal. Optionally, the fourth information may be predefined or configured by the base station. Based on the fourth information, the first terminal device and/or the second terminal device may receive data on the first frequency domain resource set on the second time unit, or a signal associated with a side synchronization signal block, thereby avoiding COT interruption of UE1, improving system transmission performance, reducing transmission delay, etc.

In one implementation, the first terminal device can determine the Nc candidate synchronization resources included in the first synchronization resource and/or the second synchronization resource on the resource pool. At the same time, if there may be Na overlapping candidate synchronization resources between the COT of the first terminal device and the first synchronization resource and/or the second synchronization resource on the resource pool, the first terminal device can indicate to the second terminal device through the first information which resources in the COT are sending resources and which resources are receiving resources, so as to avoid interruption of the COT and ensure system transmission performance.

Optionally, the above Na overlapping candidate synchronization resources can be used as the sideline synchronization signal resources indicated by the first information, and Na is less than or equal to Nc.

Optionally, the first information indicates that part or all of the overlapping candidate synchronization resource may be the first synchronization resource or the second synchronization resource.

Further, the first terminal device may indicate to the second terminal device that within Na synchronization resource, resources on the first synchronization resource and the second synchronization resource are used for sending and/or receiving S-SSB resources. Exemplarily, the first terminal device instructs the second terminal device to send a side synchronization signal on one or more second synchronization resources.

Optionally, there is no GAP before the first synchronization resource for the first terminal device to send the sideline synchronization signal, and the first terminal device includes a GAP of a first duration before receiving or instructing the second terminal device to send the sideline synchronization signal. It should be understood that the GAP is a time not used for sending or receiving, and the GAP of the first duration is predefined, configured or preconfigured, and the size of the GAP of the first duration can be 16μs or 25μs, etc.

Optionally, the first information is COT shared information sent by the first terminal device.

Exemplarily, it is assumed that a transmission period of the resource pool includes N side synchronization signal resources, and the transmission period can be 160ms. As shown in (a) of Figure 18, N=3, that is, it includes 3 side synchronization signal resources, namely resource 1, resource 2 and resource 3, wherein resource 1 is the first synchronization resource, and resource 2 and resource 3 are the second synchronization resources. Optionally, the first synchronization resource is a sending resource, and the second synchronization resource is a receiving resource; or, the first synchronization resource is a receiving resource, and the second synchronization resource is a sending resource, and the two are relatively set. Each side synchronization signal resource includes Nc candidate synchronization resources, Nc is a positive integer, and Nc candidate synchronization resources are configured, pre-configured, or reserved in the resource pool through signaling. Exemplarily, when the subcarrier spacing is 15kHz, Nc=10; when the subcarrier spacing is 30kHz, Nc=20; when the subcarrier spacing is 60kHz, Nc=20 or 40.

As shown in (b) of Figure 18, after acquiring the COT, UE1 can determine that the number of resources on its COT that overlap with the Nc candidate synchronization resources in the above-mentioned side synchronization signal resources is Na. Specifically, UE1 can determine that the number of synchronization resources that overlap with the COT of the first synchronization resource (that is, resource 1) is Na1, and that the number of synchronization resources that overlap with the COT of the second synchronization resource (resource 2 and resource 3) is Na2, then Na1+Na2=Na.

As shown in (c) of Figure 18, UE1 can share the sending resources and receiving resources of the overlapping Na resources in UE1COT with other UE2 through the first information, where the sending resources are used for UE1 to send S-SSB signals, and the receiving resources are shared with other synchronization source UEs for The synchronization resource for sending S-SSB can be used by other UE2 to send S-SSB signals to UE1. Correspondingly, UE1 can receive the S-SSB signal sent by UE2 on the receiving resource.

S520, the first terminal device sends first information to the second terminal device;

Correspondingly, the second terminal device receives the first information from the first terminal device.

The first information indicates the sideline synchronization signal resource.

In a possible implementation manner, the first information includes P bits, and the i-th bit in the P bits is used to indicate that the i-th sideline synchronization signal resource in the N sideline synchronization signal resources is the first synchronization resource or the second synchronization resource.

In another possible implementation manner, the first information includes ceil(log ₂ (N)) bits, which are used to indicate the first synchronization resource and/or the second synchronization resource among the N sideline synchronization signal resources, wherein ceil(x) represents rounding up x.

Optionally, in one example, the first terminal device sends side control information (e.g., SCI) to the second terminal device, and the side control information includes first information; in another example, the first terminal device sends a media access control element MAC CE to the second terminal device, and the MAC CE includes the first information; in yet another example, the first terminal device sends side control information and MAC CE to the second terminal device, and the side control information and MAC CE include the first information.

S530: The second terminal device receives or sends a side synchronization signal according to the first information.

According to the above scheme, the first terminal device regards the S-SSB resources as part of the COT and indicates it through indication information; further, the first terminal device also indicates which resources among the configured S-SSB resources are sending resources and which resources are receiving resources, so as to avoid interruption of the COT and ensure system transmission performance.

The following describes, in conjunction with Figures 6 and 7 , how to avoid COT interruption of UE1 due to the configuration of a synchronous RB set on a synchronous RB set and an asynchronous RB set.

FIG6 is a schematic diagram of a UE1 COT provided in an embodiment of the present application. Assuming that UE1 is a synchronous S-SSB transmitting UE, as shown in FIG6 (a), the COT of UE1 occupies an RB set1, assuming that the bandwidth of RB set1 is 20MHz, and the RB set1 includes 4 subchannels, then the bandwidth of each subchannel is 5MHz. The COT of UE1 includes 2 side synchronization signal resources (e.g., S-SSB1 and S-SSB2), N = 2. That is, the transmission of UE1 and the transmission of S-SSB are located in the same RB set1, where RB set1 is called a synchronous RB set.

On the synchronous RB set1, in order to avoid the situation where the COT is interrupted due to the configured S-SSB, UE1 may send COT sharing indication information via SCI and/or MAC CE signaling to indicate the transmit and receive status of S-SSB1 and/or S-SSB2.

In one example, UE1 may use 2 bits to indicate the transceiver status of S-SSB1 and S-SSB2, respectively. For example, a value of "1" indicates that S-SSB1 is a resource for sending S-SSB, and a bit of "0" indicates that S-SSB2 is a resource for receiving S-SSB.

In another example, UE1 may use 1 bit to jointly indicate the transceiver status of S-SSB1 and S-SSB2. For example, a value of "1" indicates that S-SSB1 is a resource for sending S-SSB, and S-SSB2 is a resource for receiving S-SSB; or a value of "0" indicates that S-SSB1 is a resource for receiving S-SSB, and S-SSB2 is a resource for sending S-SSB.

In another example, UE1 may also use 1 bit to indicate the transceiver status of S-SSB1, and the transceiver status of S-SSB2 is opposite to the transceiver status of S-SSB1 by default. For example, the value "1" only indicates that S-SSB1 is a resource for sending S-SSB. Other UE2 that share the COT of UE1 can indirectly determine that S-SSB2 is a resource for receiving S-SSB; or, the value "0" only indicates that S-SSB2 is a resource for receiving S-SSB. Other UE2 that share the COT of UE1 can indirectly determine that S-SSB1 is a resource for sending S-SSB, etc.

Similarly, as shown in (b) of FIG6 , the COT of UE1 occupies one RB set2. Assuming that the bandwidth of RB set2 is 20 MHz, and the RB set1 includes 4 subchannels, the bandwidth of each subchannel is 5 MHz. The COT of UE1 includes 3 side synchronization signal resources (e.g., S-SSB1, S-SSB2, and S-SSB3), N = 3. That is, the transmission of UE1 and the transmission of S-SSB are located in the same RB set2, where RB set2 is called a synchronous RB set.

On the synchronous RB set2, in order to avoid the situation where the S-SSB in the configured RB set2 causes COT interruption, UE1 can send COT sharing indication information through SCI and/or MAC CE signaling to indicate the transceiver status of one or more of S-SSB1, S-SSB2, and S-SSB3. The specific indication method can refer to (a) of Figure 6. For example, UE1 can use 3 bits to indicate the transceiver status of S-SSB1, S-SSB2, and S-SSB3 respectively; or, UE1 can use 2 bits to indicate the transceiver status of S-SSB1, S-SSB2, and S-SSB3 respectively; or, UE1 can also use 1 bit to indicate the transceiver status of S-SSB1, and the transceiver status of S-SSB2 and S-SSB3 is the same, and opposite to the transceiver status of S-SSB1, etc. For the sake of brevity, it will not be described in detail here.

Optionally, UE1 can determine the receiving and transmitting status of S-SSB1, S-SSB2 and S-SSB3 according to the type of synchronization source. The type of synchronization source includes but is not limited to: GNSS, a terminal device synchronized to the GNSS, a network device, a terminal device, etc. Optionally, the network device may be an eNB and/or a gNB. For example, UE1 determines, according to the type of synchronization source, that S-SSB1 and S-SSB2 are used for UE1 to send S-SSB, and S-SSB3 is used for UE1 and/or UE2 to receive S-SSB.

It should be noted that the determination of the transceiver status of at least one of the above side synchronization signal resources S-SSB1, S-SSB2 and S-SSB3 is the implementation behavior of UE1 itself, which may be similar to the transceiver status of the S-SSB resources configured in the resource pool. This application does not limit this.

Optionally, UE1 can send S-SSB on S-SSB 1, and UE1 or UE2 can receive S-SSB on S-SSB2 and/or S-SSB3.

Based on the synchronous RB set shown in Figure 6, the transmission resources of S-SSB are used as part of the COT of UE1, which can avoid the interruption of COT, improve the system transmission performance, reduce the transmission delay, etc.

Based on the COT shown in Figure 6, Figure 7 takes the COT of UE1 including the configured S-SSB's synchronization RB set2 and the synchronization RB set2 not including the configured S-SSB as an example to illustrate the technical solution of the present application.

FIG7 is a schematic diagram of another UE1 COT provided in an embodiment of the present application. Assuming that UE1 is a synchronous S-SSB transmitting UE, as shown in FIG7 (a), the COT of UE1 occupies two RB sets, RB set1 and RB set2, and the configured S-SSB resources are located in RB set2, that is, the transmission of UE1 and the transmission of S-SSB include the same RB set2, and the COT of UE1 includes the RB set2 configured with S-SSB. Similarly, as shown in FIG7 (b), the COT of UE1 occupies one RB set, RB set1, and the configured S-SSB resources are located in RB set2, that is, the transmission of UE1 and the transmission of S-SSB are not in the same RB set, and the COT of UE1 does not include the RB set2 configured with S-SSB.

For ease of understanding, RB set 2 is referred to as a synchronous RB set, and correspondingly, RB set 1 is referred to as an asynchronous RB set. Assuming that the bandwidths of RB set 1 and RB set 2 are both 20 MHz, and that RB set 1 and RB set 2 include 4 subchannels respectively, the bandwidth of each subchannel is 5 MHz. Optionally, the COT of UE1 includes 2 side synchronization signal resources (e.g., S-SSB1 and S-SSB2), and N=2.

On the synchronous RB set2, in order to avoid the situation where the configured S-SSB causes COT interruption, UE1 can send COT sharing indication information through SCI and/or MAC CE signaling to indicate the transceiver status of S-SSB1 and/or S-SSB2. Exemplarily, UE1 sends indication information to UE2 through SCI and/or MAC CE to indicate that S-SSB1 is a sending resource for S-SSB, and/or to indicate that S-SSB2 is a receiving resource for S-SSB. The specific implementation method of the indication information can be referred to the relevant description of Figure 6 above. For the sake of brevity, it will not be repeated here. Optionally, as shown in (a) of Figure 7, UE1 can send S-SSB on S-SSB1, and/or UE1 and UE2 can receive S-SSB on S-SSB2.

Further, on the asynchronous RB set1, in order to avoid the situation where the configured S-SSB causes COT interruption, UE1 can send data or signals associated with S-SSB on the asynchronous RB set1 on the time unit where S-SSB1 is located; and/or, UE1 can use the asynchronous RB set1 on the time unit where S-SSB2 is located to receive data or signals associated with S-SSB. For ease of description, the application refers to the time units where S-SSB1 and S-SSB2 on the synchronous RB set2 are located as synchronous time units, for example, the time unit where S-SSB1 is located is called synchronous time unit #1, and the time unit where S-SSB2 is located is called synchronous time unit #2.

Optionally, the base station indicates through configuration information that the synchronization time unit #1 on the asynchronous RB set1 is used to send a signal associated with the S-SSB, or to send data, or is empty. Similarly, the base station may also indicate through configuration information that the synchronization time unit #2 on the asynchronous RB set1 is used to receive a signal associated with the S-SSB, or to receive data, or is empty, and this application does not make specific limitations on this.

Exemplarily, as shown in (a) of FIG. 7 , to prevent the COT located in RB set 1 and RB set 2 from being interrupted, UE1 may send S-SSB in the synchronous RB set 2 on the synchronous time unit #1, receive S-SSB in the synchronous RB set 2 on the synchronous time unit #2, send data in the asynchronous RB set 1 on the synchronous time unit #1, and receive data in the asynchronous RB set 1 on the synchronous time unit #2. Optionally, UE1 may send COT sharing indication information to UE2 via SCI and/or MAC CE to indicate that RB set 1 and/or RB set 2 on the synchronous time unit #2 are shared receiving resources. Optionally, UE2 may receive data or a signal associated with S-SSB in RB set 1 and/or RB set 2 on the synchronous time unit #2.

Exemplarily, as shown in (b) of FIG7 , to prevent the COT located in RB set 1 from being interrupted, UE1 may send data in the non-synchronous RB set 1 on the synchronous time unit #1, and receive data in the non-synchronous RB set 1 on the synchronous time unit #2. Optionally, UE1 may send COT sharing indication information to UE2 via SCI and/or MAC CE to indicate that the non-synchronous RB set 1 on the synchronous time unit #2 is a shared receiving resource. Optionally, UE2 may receive data in RB set 1 on the synchronous time unit #2, or a signal associated with the S-SSB.

It should be noted that UE1 cannot use the asynchronous RB set 1 on the synchronous time unit #1 as a receiving resource to share COT with UE2. Optionally, in order to ensure the reliability of feedback, the asynchronous RB set 1 on the synchronous time unit #1 is not configured as a feedback resource. Optionally, the asynchronous RB set 1 on the synchronous time unit #1 can only be used to send retransmitted data, etc. This application does not limit what the asynchronous RB set 1 on the synchronous time unit #1 is specifically used for, as long as UE1's COT interruption is avoided, and there is no need to ensure that the receiving end performs HARQ feedback, etc.

Similarly, UE1 cannot use the asynchronous RB set 1 on the synchronous time unit #2 as a transmission resource to perform COT sharing with UE2. Optionally, in order to ensure the reliability of feedback, the asynchronous RB set 1 on the synchronous time unit #2 is not configured as a feedback resource. The asynchronous RB set 1 on the time unit #2 can only be used for UE2 to send retransmitted data, etc. This application does not limit what the asynchronous RB set 1 on the synchronous time unit #2 is used for. It only needs to avoid the COT interruption of UE1, and there is no need to ensure that the receiving end performs HARQ feedback, etc.

Based on the synchronous RB set shown in Figure 7, the transmission resources of S-SSB are used as part of the COT of UE1, and the asynchronous RB set on the synchronous time unit is used as the sending resource or receiving resource, which can avoid the interruption of COT, improve the system transmission performance, reduce the transmission delay, etc.

The above Figures 6 and 7 are only examples given for the convenience of understanding the solution. This application does not limit the number of RB sets occupied by the COT of UE1. For example, there can be multiple asynchronous RB sets. This application does not limit the number of S-SSB resources contained in the COT. For example, the synchronous RB set contains 2 or 3 S-SSB resources. This application does not specifically limit the transceiver status of S-SSB resources. For example, considering the limitation of half-duplex, multiple S-SSB resources are configured as S-SSB transmission resources and S-SSB reception resources, etc.

To summarize, this implementation scheme uses the public S-SSB resources as part of UE1's COT and indicates the receiving and sending status of the S-SSB resources, which can avoid COT interruption, improve system transmission performance, reduce transmission delay, etc.

FIG8 shows a schematic diagram of mapping S-SSB-related signals to the asynchronous resource block sets RB sets of UE1 COT. Exemplarily, as shown in (a) of FIG8 , UE1's COT occupies 4 RB sets, including 1 synchronous RB set and 3 asynchronous RB sets. Currently, in order to avoid COT interruption of the asynchronous RB set, UE1 can use the time unit where the S-SSB on the synchronous RB set is located, that is, the asynchronous RB sets on the synchronous time unit as a resource for transmitting S-SSB-related signals. For example, taking the time slot as an example where the unit of time domain resources is a time slot, the time slot where the S-SSB on the synchronous RB set is located can be called a synchronous time slot, and UE1 can use the synchronous time slot of the asynchronous RB set in the COT as a resource for transmitting S-SSB-related signals (e.g., S-SSS, S-PSS, or PSBCH). It should be noted that Figure 8 is only an example. This application does not limit the number of RB sets occupied by UE1, and does not limit the relationship between the frequency domain positions of the synchronous RB sets and the asynchronous RB sets. For example, the synchronous RB set can be located in any one of the multiple RB sets of the COT.

However, if the S-SSB on the synchronous RB set is directly copied on all the non-synchronous RB sets of UE1COT, since the signals on each RB set on the same time domain resources are the same, a strong peak-to-average power ratio (PAPR) will be generated, which will lead to limited transmission power of UE1 and reduced transmission performance. In view of this, the technical solution proposes a method for generating S-SSB related signals in the non-synchronous RB set(s) on the synchronous time unit (e.g., the time slot where the S-SSB on the synchronous RB set is located) of UE1COT, ensuring that the signals of each RB set on the synchronous time unit are different, reducing the peak-to-average power ratio, and improving the system transmission performance.

Fig. 9 is a flow chart of a communication method 900 provided in an embodiment of the present application. As shown in Fig. 9, the method includes the following steps.

S910, the first terminal device determines M frequency domain resource sets.

Among them, the M frequency domain resource sets include a first frequency domain resource set and a second frequency domain resource set, the second frequency domain resource set includes the frequency domain resources of the side synchronization signal resources, the first frequency domain resource set is the other M-1 frequency domain resource sets except the second frequency domain resource set, and M is an integer greater than 1.

Optionally, the first signal can be determined by any one of the following methods: an index of a primary synchronization signal in a resource block set (e.g., RB set); an index of a frequency domain resource set occupied by the primary synchronization signal in the resource block set; an index of a secondary synchronization signal in the resource block set; an index of a frequency domain resource set occupied by the secondary synchronization signal in the resource block set; an index of a PSBCH in the resource block set; an index of a frequency domain resource set occupied by the PSBCH in the resource block set.

Optionally, the number M of frequency domain resource sets may be predefined, configured or preconfigured.

Exemplarily, the number M of frequency domain resource sets may be predefined by the standard, configured by the network device/other UE, or preconfigured by the first terminal device at the factory, etc. For example, the number of frequency domain resource sets that the network device configures to be available to the first terminal device is 5, and the number of frequency domain resource sets subsequently determined by the first terminal device according to the transmission requirements is less than or equal to 5.

It should be noted that the applicable scenarios of this technical solution include:

In one example, the first frequency domain resource set is a first resource block set (eg, RB set1), and the second frequency domain resource set is a second resource block set (eg, RB set2). For example, the first frequency domain resource set is an asynchronous RB set1, and the second frequency domain resource set is a synchronous RB set2.

In another example, the first frequency domain resource set and the second frequency domain resource set are located in the same resource block set. For example, the first frequency domain resource set is the frequency domain bandwidth of the synchronization RB set except the frequency domain bandwidth for sending S-SSB, and the second frequency domain resource set is the frequency domain bandwidth for sending S-SSB in the synchronization RB set.

In one implementation, the first frequency domain resource set and the second frequency domain resource set are located in the same resource block set.

Exemplarily, the sideline synchronization signal block includes a first sideline synchronization signal block and a second sideline synchronization signal block, the first sideline synchronization signal block is located outside the resource pool, and the second sideline synchronization signal block is located inside the resource pool or outside the resource pool.

Optionally, the first side synchronization signal block accesses the channel by means of short control signaling, and the second side synchronization signal block accesses the channel by means of perception.

Optionally, accessing the channel using short control signaling includes: accessing the channel without using a sensing method, or accessing the channel using a type 2A channel access method. Optionally, type 2A can refer to the definition in 3GPP TS37.213. For example, when the monitoring is idle for 25μs, the signal to be sent can be sent immediately.

Optionally, accessing the channel by means of short control signaling satisfies: a duty cycle of sending the first side synchronization signal does not exceed 1/20.

Optionally, S901, the first terminal device sends indication information to the second terminal device;

Correspondingly, the second terminal device receives the indication information from the first terminal device.

The indication information indicates the first frequency domain resource set and/or the second frequency domain resource set.

Exemplarily, the indication information includes 1 bit, for example, "0" is used to indicate the first frequency domain resource set, and "1" is used to indicate the second frequency domain resource set.

In one example, a first terminal device obtains a COT, which includes a first frequency domain resource set and a second frequency domain resource set.

S920, the first terminal device sends a sideline synchronization signal block and a first signal in a first time unit, where the sideline synchronization signal block is located in the second frequency domain resource set, and the first signal is located in the first frequency domain resource set;

Correspondingly, the second terminal device receives the first signal from the first terminal device on the first frequency domain resource set on the first time unit.

Optionally, the second terminal device receives a sidelink synchronization signal block from the first terminal device on a second frequency domain resource set on a first time unit.

The first signal includes PSBCH, and the first signal is determined by the index of the frequency domain resource set. How to determine the first signal according to the index of the frequency domain resource set will be described in detail below, and will not be described here.

It should be understood that the side synchronization signal block includes S-PSS, S-SSS and PBSCH. For ease of description, the present application abbreviates S-PSS, S-SSS and PBSCH as P, S and B respectively. Exemplarily, the side synchronization signal block can occupy one slot, for example, the side synchronization signal block includes 13 symbols, which are mapped in sequence from symbol 0 to symbol 12 in the time domain as: B-P-P-S-S-B-B-B-B-B-B-B-B; for another example, the side synchronization signal block includes 11 symbols, which are mapped in sequence from symbol 0 to symbol 10 in the time domain as: B-P-P-S-S-B-B-B-B-B-B-B; or, the side synchronization signal block can also occupy 4 symbols, for example, in the time domain, symbols 0 to 3 are mapped in sequence as: P-B-S-B.

In a possible implementation, all first signals are PSBCHs.

Exemplarily, the first terminal device uses rate matching to map all symbols of the M-1 first frequency domain resource sets on the first time unit to PSBCH. Optionally, there is no S-PSS and S-SSS on the M-1 first frequency domain resource sets. The first time unit is the time unit where the S-SSB on the second frequency domain resource set is located.

Exemplarily, the first terminal device uses rate matching to map all symbols from the second symbol to the second to last symbol on the first time unit to PSBCH on the first frequency domain resource set. Optionally, there is no S-PSS and S-SSS on the M-2 first frequency domain resource sets. The first time unit is the time unit where the S-SSB on the second frequency domain resource set is located. Optionally, the first symbol on the first time unit of the M-2 first frequency domain resource sets can reuse the PSBCH symbol on the second symbol on each first frequency domain resource set, and the first symbol can be used for AGC by the terminal device.

It should be understood that the first time unit here is the time domain resource used to transmit S-SSB on the synchronous RB set, which can also be called a synchronous time unit. For example, the time slot where the S-SSB is located as shown in Figure 8 is the synchronous time slot.

It should also be understood that in this implementation, the first terminal device performs rate matching of the PSBCH according to all symbols of the first time unit.

As shown in FIG10 , it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronous time unit (or called the first time unit) as an example, and the time slot is called a synchronous time slot. The COT of UE1 occupies three (i.e., M=3) frequency domain resource sets (e.g., RB sets), namely, one synchronous RB set and two asynchronous RB sets, i.e., asynchronous RB set1 and asynchronous RB set2. Among them, symbols 0, 5 to 12 of the synchronous RB set are mapped to PSBCH, symbols 1 and 2 are mapped to S-PSS, symbols 3 and 4 are mapped to S-SSS, and symbol 13 is a GAP symbol. All symbols (i.e., symbols 0 to 12) except the last GAP symbol on the asynchronous RB set1 and the asynchronous RB set2 are mapped to PSBCH.

Optionally, in an example where a time slot includes 14 symbols, the first terminal device may generate a PSBCH according to all resources on 12 symbols. Optionally, the generated PSBCH is respectively mapped to symbols 1 to 12 on the synchronous time slot of the asynchronous RB set. Optionally, the PSBCH on symbol 1 may be multiplexed on symbol 0. Optionally, at this time, the PSBCH on the synchronous time slot is rate matched according to 12 symbols.

Optionally, in an example where a time slot includes 12 symbols, the first terminal device may generate a PSBCH according to all resources on 10 symbols. Optionally, the generated PSBCH is respectively mapped to symbols 1 to 11 on the synchronous time slot of the asynchronous RB set. Optionally, the PSBCH on symbol 1 may be multiplexed on symbol 0. Optionally, at this time, the PSBCH on the synchronous time slot is rate matched according to 10 symbols.

Based on this, mapping the first signal in the above manner (i.e., all the first signals are PSBCH) on the asynchronous RB set on the synchronous time unit can ensure that on each asynchronous RB set, the signal on the symbol corresponding to the S-PSS symbol and S-SSS symbol on the synchronous RB set is different from the S-PSS and S-SSS, thereby reducing PAPR.

In another possible implementation, the first terminal device copies the PSBCH on the synchronization time unit of the second frequency domain resource set to the symbol corresponding to the synchronization time unit of the first frequency domain resource set; the first terminal device copies the PSBCH on some symbols of the synchronization time unit of the second frequency domain resource set to the symbols corresponding to the S-PSS and S-SSS on the synchronization time unit in the first frequency domain resource set. Optionally, the bits copied are the bits encoded by the PSBCH on the corresponding symbols in the second frequency domain resource set. Optionally, the bits copied are the bits encoded by the PSBCH on the corresponding symbols in the second frequency domain resource set and before scrambling.

Exemplarily, the first terminal device copies the PSBCH in the second frequency domain resource set to the same symbol position in the first frequency domain resource set in sequence according to the symbol position of the PSBCH in the second frequency domain resource set. Further optionally, any one or more PSBCHs in the second frequency domain resource set are copied to the symbol positions corresponding to the S-PSS and S-SSS on the first frequency domain resource set. Optionally, the encoded bits of the symbol position where the PSBCH on the first frequency domain resource set is located are the same as the encoded bits of the symbol position where the PSBCH on the second frequency domain resource set is located.

Exemplarily, the first terminal device generates a PSBCH according to the symbols occupied by the PSBCH in the second frequency domain resource set, and maps the generated PSBCH to the same symbol positions in the first frequency domain resource set. Further optionally, any one or more PSBCHs that have been generated and mapped in the first frequency domain resource set are copied to the S-PSS symbol and S-SSS symbol positions on the first frequency domain resource set. Optionally, the encoded bits of the symbol position where the PSBCH on the first frequency domain resource set is located are the same as the encoded bits of the symbol position where the PSBCH on the second frequency domain resource set is located.

As shown in FIG11 , it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronization time unit as an example, and the time slot is called a synchronization time slot. The COT of UE1 occupies two (i.e., M=2) frequency domain resource sets (e.g., RB sets), namely, one synchronization RB set and one non-synchronization RB set. Among them, symbols 0, 5 to 12 of the synchronization RB set are mapped to PSBCH, symbols 1 and 2 are mapped to S-PSS, symbols 3 and 4 are mapped to S-SSS, and symbol 13 is a GAP symbol. Symbols 0, 5 to 12 of the non-synchronization RB set are mapped to PSBCH, and the PSBCH on symbol 0 is copied from the PSBCH on symbol 0 of the synchronization RB set, and the coded bits of symbol 0 where the PSBCH on the non-synchronization RB set is located are the same as those of symbol 0 where the PSBCH on the synchronization RB set is located. Similarly, the PSBCHs on symbols 5 to 12 are copied from the PSBCHs on symbols 5 to 12 of the synchronous RB set, and the PSBCHs on symbols 5 to 12 on the asynchronous RB set are the same as the encoded bits of the PSBCHs on symbols 5 to 12 on the synchronous RB set.

Specifically, copying any one or more PSBCHs in the synchronous RB set to the S-PSS symbol and S-SSS symbol position on the asynchronous RB set can be understood as:

In one example, the symbol position on the synchronous RB set: any one of symbol 0, symbol 5 to symbol 12 (for example, PSBCH on symbol 7) is repeated 4 times and mapped to symbols 1 to 4 where the S-PSS and S-SSS of the asynchronous RB set are located.

In another example, the PSBCH on any two symbols (e.g., symbol 5 and symbol 10) in the symbol position on the synchronous RB set is repeated twice and mapped to symbols 1 to 4 where the S-PSS and S-SSS of the asynchronous RB set are located. For example, symbols 1 and 2 are mapped to the PSBCH on symbol 5 of the synchronous RB set, and symbols 3 and 4 are mapped to the PSBCH on symbol 8 of the synchronous RB set.

In another example, as shown in FIG11 , the PSBCH at symbol positions on the synchronous RB set: symbol 0, any four symbols from symbol 5 to symbol 12 (e.g., symbol 9, symbol 10, symbol 11, and symbol 12) are respectively mapped to symbols 1 to 4 where the S-PSS and S-SSS of the non-synchronous RB set are located. For example, symbol 1 is mapped to the PSBCH at symbol 9 of the synchronous RB set, symbol 2 is mapped to the PSBCH at symbol 10 of the synchronous RB set, symbol 3 is mapped to the PSBCH at symbol 11 of the synchronous RB set, and symbol 4 is mapped to the PSBCH at symbol 12 of the synchronous RB set.

Based on this, mapping the first signal (i.e., PSBCH) in the above manner on the asynchronous RB set on the synchronous time unit can ensure that the signals on each RB set from symbol 1 to symbol 4 are different, thereby reducing PAPR. Furthermore, because the PSBCH on the first frequency domain resource The same numbered bits as those of the PSBCH on the second frequency domain resources are used, so only one cache is needed to store the PSBCH encoded bits to map them to different frequency domain resource sets. This implementation method further reduces the storage size of the first terminal device and saves costs.

In another possible implementation, the first signal further includes S-PSS and/or S-SSS, and the symbol position of the S-PSS in the first frequency domain resource set is different from the symbol position of the S-PSS in the second frequency domain resource set.

Exemplarily, the first terminal device determines the symbol position of the S-PSS and/or S-SSS on the first frequency domain resource set in the first time unit according to the index of the first frequency domain resource set, and the first time unit is the time unit where the S-SSB on the second frequency domain resource set is located. That is to say, in the first frequency domain resource set configured on the resource pool, the time domain mapping method of the S-PSS, S-SSS and PSBCH is determined by the method of indexing the first frequency domain resource set, thereby ensuring that on symbols 0 to 12 on the first time unit, the signal on the synchronous RB set is different from the signal on at least one asynchronous RB set.

As shown in Figure 12, it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronization time unit as an example, and the time slot is called a synchronization time slot. The COT of UE1 occupies six (i.e., M = 6) frequency domain resource sets (e.g., RB sets), namely, 1 synchronous RB set and 5 asynchronous RB sets, namely, asynchronous RB set1 to asynchronous RB set5. Among them, symbols 0, 5 to 12 of the synchronous RB set are mapped to PSBCH, symbols 1 and 2 are mapped to S-PSS, symbols 3 and 4 are mapped to S-SSS, and symbol 13 is a GAP symbol.

Optionally, for example, the indexes of asynchronous RB set 1 to asynchronous RB set 5 are 1 to 5, respectively, indicating that relative to the synchronous RB set, symbols 1 to 12 on the asynchronous RB set 1 to the asynchronous RB set 5 need to be shifted right by 10, 8, 6, 4, and 2 symbol positions, respectively. At this time, the symbol position where the S-PSS on the asynchronous RB set 1 is located is shifted right to symbols 11 and 12, the symbol position where the S-PSS on the asynchronous RB set 2 is located is shifted right to symbols 9 and 10, the symbol position where the S-PSS on the asynchronous RB set 3 is located is shifted right to symbols 7 and 8, the symbol position where the S-PSS on the asynchronous RB set 4 is located is shifted right to symbols 5 and 6, and the symbol position where the S-PSS on the asynchronous RB set 5 is located is shifted right to symbols 3 and 4.

It should be noted that Figure 12 is only an example given to facilitate understanding of the solution. The index of the first frequency domain resource set, the S-PSS on the first frequency domain resource set, and/or the symbol position of the S-SSS in the first time unit may be predefined, configured or preconfigured, and this application does not make specific limitations. In addition, the transformation of the symbol positions of the S-SSS and S-PSS can be bound or separated; and the determination method of the symbol positions of the S-SSS and S-PSS can be the same or different, and this application does not make specific limitations.

Based on this, mapping the first signal (i.e., PSBCH, S-SSS, and S-PSS) in the above manner on the asynchronous RB set on the synchronous time unit can ensure that the signals on each symbol on each RB set are different, thereby reducing the PAPR.

In another possible implementation, the first terminal device determines M S-SSS sequences, and the M S-SSS sequences correspond one-to-one to the indexes of M frequency domain resource sets.

It should be noted that the M S-SSS sequences correspond one-to-one to the indexes of the M frequency domain resource sets, which can be understood as: each frequency domain resource set corresponds to an S-SSS sequence among the M S-SSS sequences, and each S-SSS sequence in the M S-SSS sequences is different.

In one example, the first signal includes at least one S-PSS.

Optionally, when the first signal includes M-1 S-PSSs, the first terminal device scrambles the M-1 S-PSSs in the first frequency domain resource set on the first time unit according to the M S-SSS sequences, so that the S-PSS sequences on each RB set are also different, thereby reducing the PAPR. It should be understood that the present application does not specifically limit the scrambling method of the M-1 S-PSSs in the first frequency domain resource set on the first time unit.

Optionally, when the first signal includes M-1 S-PSSs, the first terminal device scrambles the S-PSS in each frequency domain resource set of M frequency domain resource sets on the first time unit according to the M S-SSS sequences. It should be understood that the present application does not specifically limit the scrambling method of the M-1 S-PSSs in the first frequency domain resource set on the first time unit.

It should be noted that the scrambling of the S-PSS here can be understood as: for the S-PSS on the j frequency domain resource sets, the S-PSS on the second frequency domain resource set and the S-SSS sequence on the first frequency domain resource set can be modulo-2 added according to the corresponding bits. Exemplary:

Sc(j,i)＝(a(i,0)+b(j,i))mod 2,i＝0,1,N-1

Among them, Sc(j,i) represents the i-th bit of the S-PSS sequence on the j-th first frequency domain resource set, a(i,0) represents the i-th bit of the S-PSS sequence on the second frequency domain resource set, b(j,i) represents the i-th bit of the S-SSS sequence on the j-th first frequency domain resource set, j is the S-SSB index or the index of the frequency domain resource, and N is a positive integer.

That is to say, the symbol positions of S-PSS, S-SSS, and PSBCH on the M frequency domain resource sets in this implementation can be the same. For example, symbols 0, 5 to 12 on each frequency domain resource set are mapped to PSBCH, symbols 1 and 2 are mapped to S-PSS, symbols 3 and 4 are mapped to S-SSS, and symbol 13 is a GAP symbol. However, it is necessary to map the M-1 first frequency domain resource sets. The S-PSS and S-SSS on the RF signal are modified accordingly to avoid the problem of high PAPR.

Optionally, scrambling the S-PSS can also be understood as: for the S-PSS on j frequency domain resource sets, the S-PSS on the second frequency domain resource set and the random sequence c(i,j) can be added modulo 2 according to the corresponding bits; for the S-SSS on i frequency domain resource sets, the S-SSS sequence on the first frequency domain resource set and the random sequence c(i,j) can be added modulo 2 according to the corresponding bits.

In a first implementation, S-PSS(i,j)=(S-PSS(0,j)+c(i,j))mod 2,0≤j<L-1,0≤i<Nt-1; and/or,

S-SSS(i,j)＝(S-SSS(0,j)+c(i,j))mod 2,0≤j<L-1,0≤i<Nt-1；

Wherein, L is the length of the S-PSS sequence, S-PSS(0,j) is the master synchronization signal sequence in the side synchronization signal block, S-SSS(0,j) is the slave synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth symbol in the i-th random sequence, the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the index of the frequency domain resource set, and mod represents a modulo operation. Optionally, Nt is the number of M frequency domain resource sets determined by the first terminal device.

In one example, the initial value C _init of c(i,j) satisfies:

C _init = SLSSID + i; or,

C _init = SLSSID*2 ⁿ + i; or,

C _init = SLSSID + i * 2 ^m ;

Among them, i is the S-SSB index or the index of the frequency domain resource, and m and n are integers.

In a second implementation, S-PSS(i,j)=S-PSS(0,j)*(1-2*c(i,j)), 0≤j<L-1; and/or,

S-SSS(i,j)＝S-SSS(0,j)*(1-2*c(i,j)), 0≤j<L-1;

Wherein, L is the length of the S-PSS sequence, L is also the length of the S-SSS sequence, S-PSS(0,j) is the master synchronization signal sequence in the side synchronization signal block, S-SSS(0,j) is the slave synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth code element in the i-th random sequence, and the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the index i of the frequency domain resource set, i is an integer. Optionally, 1≤i<M-1, the set of M frequency domain resources determined by the first terminal device.

It should be understood that S-PSS(i,j) represents i repeated scrambled S-PSS sequences, S-PSS(0,j) represents the S-PSS sequence at the frequency position of the S-SSB (which can be referred to as S-SSB ARFCN or synchronization frequency point) used for synchronization, S-SSS(i,j) represents i repeated scrambled S-SSS sequences, S-SSS(0,j) represents the S-SSS sequence at the frequency position of the S-SSB (which can be referred to as S-SSB ARFCN or synchronization frequency point) used for synchronization, and i is the S-SSB repetition number index. That is to say, in this implementation, the S-SSBs of non-synchronous frequency points other than the S-SSB used for synchronization are scrambled.

The following is a specific description of the generation method of the S-PSS and S-SSS sequences on the synchronization frequency point:

Exemplarily, the S-PSS sequence d _S-PSS (n) can be expressed as:
d _S-PSS (n) = 1-2x (m);

Among them, x(i+7)＝(x(i+4)+x(i))mod 2,

For example: [x(6) x(5) x(4) x(3) x(2) x(1) x(0)] = [1 1 1 0 1 1 0].

Exemplarily, the S-SSS sequence d _S-SSS (n) can be expressed as:
d _S-SSS (n) = [1-2x ₀ ((n+m ₀ ) mod 127)][1-2x ₁ ((n+m ₁ ) mod 127)];

Among them, x ₀ (i+7) = (x ₀ (i+4) + x ₀ (i)) mod 2; x ₁ (i+7) = (x ₁ (i+1) + x ₁ (i)) mod 2;

For example: [x ₀ (6) x ₀ (5) x ₀ (4) x ₀ (3) x ₀ (2) x ₀ (1) x ₀ (0)] = [0 0 0 0 0 0 1];
[ _x1 (6) _x1 (5) _x1 (4) _x1 (3) _x1 (2) _x1 (1) _x1 (0)]＝[0 0 0 0 0 0 1].

Based on the second possible scrambling method described above, the initial value of the corresponding scrambling sequence can be generated as follows:

Exemplarily, the initial value of the random sequence used to scramble the S-PSS, S-SSS and/or PSBCH in the i-th frequency domain resource set is determined according to any of the following expressions:

or,

Wherein, c _init (i) is the initial value of the random sequence, the value of i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, wherein k is an integer greater than or equal to 1, q is an integer greater than or equal to 1, and (q+k)≤31, represents the identifier of the side synchronization signal sequence, and floor(x) represents rounding down x. Optionally, the value of k can be 10, 20, 30, etc. Optionally, the value of q can be Optionally, (q+k)≤31, for example, the value of (q+k) is any integer between 20 and 31, for example, 20, 21, 25, 30 or 31. Optionally, M is the M frequency domain resource sets determined by the first terminal device. Optionally, M is the M frequency domain resource sets determined by the first terminal device. Optionally, q＝20 or 21, and the 31-bit shift register can be shifted as much as possible. The remaining 20 or 21 bits of the 31 bits other than the occupied 10 bits are randomized as much as possible to increase the difference of the sequence, thereby further reducing the PAPR.

Based on this implementation, the initial value of the random sequence is generated using parameters related to the index of the frequency domain resource set, thereby generating M-1 different random sequences in a simple and easy-to-implement manner. Then, the S-PSS and/or S-SSS on the non-synchronous frequency point are scrambled using the M-1 random sequences, and M-1 different S-PSS sequences and M-1 different S-SSS sequences can be obtained. Together with the S-PSS sequence on the original synchronous frequency point and the S-SSS sequence on the original synchronous frequency point, M different S-PSS sequences and M different S-SSS sequences can be obtained respectively. Because these M sequences are different, the PAPR of the time domain signal generated by the signal number of the M frequency domain resource set can be reduced to the greatest extent, thereby increasing the maximum available power during actual transmission and improving the transmission performance.

In the technical solution of the present application, the first terminal device determines M S-SSS sequences, including:

In one example, the first terminal device determines M S-SSS sequences, an integer of 1≤i≤M, based on the SLSSID in the i-th frequency domain resource set.

Among them, SLSSID_i in the i-th frequency domain resource set satisfies:

SLSSID_i＝(RBSi-1)*Ms/M+SLSSID_n；or,

SLSSID_i＝(RBSi)*Ms/M+SLSSID_n；

Among them, RBSi is the index of the i-th frequency domain resource set, i is an integer greater than or equal to 1 and less than or equal to M, the value of SLSSID_n is any integer in [0,1,…,Ms/M], and Ms is a positive integer not less than M.

Optionally, the value range of SLSSID_i should be smaller than Ms-M, or smaller than Ms-M+1.

Optionally, Ms is a positive integer, or in other words, Ms is a positive integer value that is an integer multiple of M.

Optionally, Ms takes a value of any one of 335, 336, 670, 671, or 672.

Optionally, the first terminal device determines the SLSSID_i of the S-SSB to be sent in the second frequency domain resource set, and then determines the S-PSS and S-SSS used on the corresponding second frequency domain resource set according to the above formula (1) or formula (1a).

Optionally, the above formula (1) is applied to a communication device in a network. Optionally, the above formula (1a) is applied to a communication device outside a network.

Optionally, SLSSID_i may also take one or more of the values 0, Ms/M, 2Ms/M, … (M-1)Ms/M to indicate that the first terminal device is directly synchronized to the satellite.

Optionally, SLSSID_i may also take one or more of the values 0, Ms/M/2, 2Ms/M/2, … (M-1)Ms/M/2 to indicate that the first terminal device is indirectly synchronized to the satellite.

In another example, the first terminal device determines the SLSSID in the first frequency domain resource set based on the index RBSi of the i-th frequency domain resource set and the SLSSID of the sidelink synchronization signal block in the second frequency domain resource set.

Exemplarily, RBS _i is used to generate SLSSID. That is, it satisfies:
SLSSID＝ _RBSi +SLSSID0

Among them, SLSSID0 is the SLSSID of the S-SSB determined by the first terminal device in the second frequency domain resource set, and RBS _i represents the i-th frequency domain resource set index.

Based on this, on the asynchronous RB sets on the synchronous time unit, it can be ensured that the S-SSS sequences corresponding to at least two asynchronous RB sets are different. Based on the M-1 S-SSS sequences corresponding to the M-1 asynchronous RB sets among the generated M S-SSS sequences, the S-PSS on the M-1 asynchronous RB sets is scrambled, so that the S-PSS sequences on each RB set are also different, thereby reducing the PAPR. Optionally, the M S-SSS sequences can be used to scramble the S-PSS on the M RB sets, which is not limited in this application.

In summary, in order to solve the problem of identical signals on multiple frequency domain resource sets, especially the high PAPR problem of signals on symbols where PSBCH is located between multiple asynchronous RB sets, for example, the identical signals on symbols 1 to 4 of asynchronous RB set 1 and asynchronous RB set 2 shown in FIG. 10 may result in limited transmission power, etc., different sequences can be used to scramble PSBCH. Specifically, parameters related to the index of the frequency domain resource set (RB set index) can be used to scramble PSBCH.

The following specifically describes how the first signal sent on the first frequency domain resource set on the first time unit is determined according to the index of the frequency domain resource set.

In one possible implementation, the first terminal device generates a first sequence, an integer of 1≤i≤M, according to the index of the i-th frequency domain resource set; the first terminal device scrambles the PSBCH on the i-th frequency domain resource set on the first time unit according to the first sequence.

That is to say, this implementation method needs to generate a first sequence for each of the M frequency domain resource sets, and scramble the PSBCH on the synchronous RB set and the asynchronous RB set according to the first sequence.

In another possible implementation, the first terminal device generates a first sequence according to an index of the first frequency domain resource set; the first terminal device scrambles the PSBCH on the first frequency domain resource set on the first time unit according to the first sequence.

That is, in this implementation, a first sequence is generated according to the indexes of the M-1 first frequency domain resource sets, and the PSBCH on the M-1 non-synchronous RB sets is scrambled according to the first sequence. For example,

ac(j,i)＝(a(j,i)+c(j,i))mod 2,i＝0,1,M _bit -1

Among them, M _bit represents the number of bits sent on PSBCH, ac(j,i) represents the i-th bit after scrambling on the j-th first frequency domain resource set, a(j,i) represents the i-th bit before scrambling on the j-th first frequency domain resource set, and c(j,i) represents the i-th bit of the scrambling sequence on the j-th first frequency domain resource set.

Optionally, the scrambling sequence is a random sequence or a pseudo-random sequence. For example, it is a Gold sequence with a length of 31. A sequence c(n) with a length of M _PN , n=0, 1, ..., M _PN -1 is defined as follows:
c(n)＝( _x1 (n+ _NC )+ _x2 (n+ _NC ))mod2
x ₁ (n+31)＝(x ₁ (n+3)+x ₁ (n))mod 2
_x2 (n+31)=( _x2 (n+3)+ _x2 (n+2)+ _x2 (n+1)+ _x2 (n))mod 2

Here, Nc=1600, and the initial values of the first m-sequence _x1 (n) are _x1 (0)=1, _x1 (n)=0, n=1, 2, ..., 30. The initial values of the second m-sequence _x2 (n) are

Specifically, in the existing On the basis of, the initial value c _init of the scrambling sequence may be generated according to the index of the frequency domain resource set (eg, the i-th frequency domain resource set, or the first frequency domain resource set).

In one example,

In another example, Wherein m is an integer. Optionally, m may be the number of bits occupied by the value of RBS _i , for example, when there are 8 RB sets, m=3. Optionally, m=ceil(log ₂ (RBS _i )), where ceil(x) represents rounding x upwards.

In yet another example, Where n is an integer. Optionally, n can be The number of bits occupied by the value of The value of can be 1024, n = 10. Optional, Here, ceil(x) means rounding x upwards.

Optionally, in the present application, the above-mentioned random sequence can be a random sequence used to scramble S-PSS and S-SSS, or a random sequence used to scramble PSBCH, or a random sequence for generating DMRS of PSBCH. For example, the above-mentioned random sequence can also be the first sequence and the second sequence in the present application.

Optionally, the PSBCH includes a reference signal for PSBCH demodulation, the reference signal for PSBCH demodulation is generated by a second random sequence, and an initial value of the second random sequence is determined by an identifier of a sidelink synchronization signal sequence and/or an index of a first frequency domain resource set.

In addition, for the frequency domain of S-SSB contained in one RB set or multiple RB sets, the initial value of the demodulation reference signal (DMRS) sequence of PSBCH is:

or,

Wherein, c _init (i) is the initial value of the random sequence, i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, k is an integer greater than or equal to 1, q is an integer greater than or equal to 1, Indicates the identifier of the side synchronization signal sequence, floor(x) indicates rounding down x. Optionally, the value of k can be 10, 20, 30, etc. Optionally, the value of q can be 10, 20, 30, etc. Optionally, (q+k)≤31, for example, the value of (q+k) is any integer between 20 and 31, such as 20, 25, 30 or 31, etc. Optionally, M is the M frequency domain resource sets determined by the first terminal device. Optionally, q＝20 or 21, and the 31-bit shift register can be shifted as much as possible. The remaining 20 or 21 bits of the 31 bits other than the occupied 10 bits are randomized as much as possible to increase the difference in sequence, thereby further reducing Low PAPR.

In the above method, different initial values of the scrambling sequence can be generated for different frequency domain resource sets, thereby generating different scrambling sequences, and using different scrambling sequences to scramble the PSBCH to be transmitted, thereby achieving different purposes of the PSBCH generated on different frequency domain resource sets, avoiding the problem of high PAPR during transmission on the synchronous time domain unit, and improving system performance.

Based on the above two implementations, the index RBS _i of the i-th frequency domain resource set may be determined according to any one of the following:

The index of the i-th frequency domain resource set;

a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set;

an absolute value of a difference between an index of a first frequency domain resource set and an index of a second frequency domain resource set;

The sum of the difference between the index of the first frequency domain resource set and the index of the second frequency domain resource set and M, where M is the number of frequency domain resources;

The parameter value configured for the frequency domain resource set, where the configuration can be predefined, configured or preconfigured.

Optionally, when the first frequency domain resource set and the second frequency domain resource set belong to the same resource block set, the determination may be made according to any one of the following:

The index of the first frequency domain resource set is determined according to the starting subcarrier (subchannel or physical resource block PRB) position of the first frequency domain resource;

The index of the first frequency domain resource set is determined according to the position of the central subcarrier (subchannel or physical resource block PRB) of the first frequency domain resource;

The index of the first frequency domain resource set is determined according to the position of the ending subcarrier (subchannel or physical resource block PRB) of the first frequency domain resource;

The index of the first frequency domain resource set is determined according to the index of the first frequency domain resource set in the resource block set;

The index of the second frequency domain resource set is determined according to the starting subcarrier (subchannel or physical resource block PRB) position of the second frequency domain resource;

The index of the second frequency domain resource set is determined according to the position of the central subcarrier (subchannel or physical resource block PRB) of the second frequency domain resource;

The index of the second frequency domain resource set is determined according to the position of the ending subcarrier (subchannel or physical resource block PRB) of the second frequency domain resource;

A first parameter value configured for the first frequency domain resource set, determining an index of the first frequency domain resource set, where the configuration may be predefined, configured or preconfigured;

The first parameter value configured for the second frequency domain resource set determines the index of the second frequency domain resource set, where the configuration may be predefined, configured or preconfigured.

Currently, for a channel bandwidth of, for example, 20MHz in an RB set, in order to meet the 80% OCB bandwidth requirement, the signal sent by the first terminal device needs to occupy at least 16MHz of spectrum bandwidth. Assuming that the S-SSB occupies only 11 PRBs, the channel occupancy requirement of the OCB cannot be met. Therefore, the S-SSB can be sent repeatedly to occupy the entire bandwidth of the RB set as much as possible. However, this implementation method will still produce a strong PAPR, resulting in limited transmission power and reduced transmission performance. Therefore, a solution is provided to reduce the peak-to-average ratio of the time unit where the S-SSB on the RB set is located, that is, the generation method of the first signal on other frequency domain resources in the RB set except the 11 PRBs occupied by the S-SSB.

As shown in (a) of Figure 13, it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronization time unit as an example, and the time slot is called a synchronization time slot. The position of the time domain resources occupied by the PSBCH in the S-SSB on the RB set is: symbol 0, symbols 5 to 12. The starting and ending positions of the frequency domain resources occupied by the PSBCH are marked as: subcarrier 0 to subcarrier 131. The starting position of the time domain resources occupied by the S-PSS and/or S-SSS in the S-SSB is: symbol 1 to symbol 4, and the starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS are: subcarrier 2 to subcarrier 128. Optionally, the PSBCH also occupies the S-PSS, S-SSS in the frequency domain resource set, and the frequency domain resources other than subcarrier 0 to subcarrier 131 on the time unit where the PSBCH is located.

Exemplarily, according to the implementation method of the first signal described in Figures 10, 11 and 12 above, the PSBCH is mapped outside the time-frequency resources configured with the S-SSB. Optionally, it can be mapped outside subcarrier 0 to subcarrier 131. For example, the frequency domain resources below subcarrier 0 and above subcarrier 131 shown in (a) of Figure 13, and the subcarriers corresponding to 0, 1, 129, 130, and 131 on the S-PSS and S-SSS bandwidth edges are not mapped to the PSBCH.

As shown in (b) of Figure 13, it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronization time unit as an example, and the time slot is called a synchronization time slot. The positions of the time domain resources occupied by the PSBCH in the S-SSB on the RB set are: symbol 0, symbols 5 to 12. The starting and ending positions of the frequency domain resources occupied by the PSBCH are marked as: subcarrier 0 to subcarrier 131. Optionally, the PSBCH also occupies the S-PSS, S-SSS in the frequency domain resource set, and the frequency domain resources other than subcarrier 0 to subcarrier 131 on the time unit where the PSBCH is located. The starting position of the time domain resources occupied by the S-PSS and/or S-SSS in the S-SSB is: symbol 1 to symbol 4, and the starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS are marked as: subcarrier 2 to subcarrier 128.

Exemplarily, according to the implementation of the first signal described in FIG. 10, FIG. 11 and FIG. 12, the PSBCH is mapped outside the time-frequency resources configured with the S-SSB. Optionally, it can be mapped outside the subcarrier 0 to the subcarrier 131. For example, the frequency domain resources below the subcarrier 0 and above the subcarrier 131 shown in FIG. 13 (b), and the subcarriers 0, 1, 129, 130, and 131 corresponding to the bandwidth edges of the S-PSS and S-SSS. PSBCH is mapped on the carrier.

As shown in (c) of Figure 13, it is assumed that the unit of time domain resources is a time slot, and a time slot (including 14 symbols) is taken as a synchronization time unit as an example, and the time slot is called a synchronization time slot. The positions of the time domain resources occupied by the PSBCH in the S-SSB on the RB set are: symbol 0, symbols 5 to 12. The starting and ending positions of the frequency domain resources occupied by the PSBCH are marked as: subcarrier 0 to subcarrier 131. Optionally, the PSBCH also occupies the S-PSS, S-SSS in the frequency domain resource set, and the frequency domain resources other than subcarrier 0 to subcarrier 131 on the time unit where the PSBCH is located. The starting position of the time domain resources occupied by the S-PSS and/or S-SSS in the S-SSB is: symbol 1 to symbol 4, and the starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS are marked as: subcarrier 2 to subcarrier 128.

Exemplarily, the first signal is generated by generating M S-SSS sequences as described above, and scrambling M-1 S-PSSs according to the M S-SSS sequences, that is, mapping the PSBCH outside the time-frequency resources configured with the S-SSB. Optionally, it can be mapped outside subcarriers 0 to 131, and the PSBCH is not mapped on the subcarriers corresponding to 0, 1, 129, 130, and 131 on the bandwidth edge of each S-PSS and S-SSS.

As shown in (d) of Figure 13, in the manner of method 3 above in this embodiment, optionally, the PSBCH is mapped outside the time-frequency resources configured with the S-SSB, and the PSBCH is mapped on subcarriers 129, 130, 131, and 0 and 1 on the bandwidth edges of the S-PSS and S-SSS.

Assume that the unit of time domain resources is time slot, and take a time slot (including 14 symbols) as a synchronization time unit as an example, the time slot is called a synchronization time slot. The position of the time domain resources occupied by the PSBCH in the S-SSB on the RB set is: symbol 0, symbols 5 to 12, and the start and end positions of the frequency domain resources occupied by the PSBCH are marked as: subcarrier 0 to subcarrier 131. Optionally, the PSBCH also occupies the S-PSS, S-SSS in the frequency domain resource set, and the frequency domain resources other than subcarrier 0 to subcarrier 131 on the time unit where the PSBCH is located. The starting position of the time domain resources occupied by the S-PSS and/or S-SSS in the S-SSB is: symbol 1 to symbol 4, and the start and end positions of the frequency domain resources occupied by the S-PSS and/or S-SSS are marked as: subcarrier 2 to subcarrier 128.

Exemplarily, the first signal is generated by generating M S-SSS sequences as described above, and scrambling M-1 S-PSSs according to the M S-SSS sequences, that is, mapping the PSBCH outside the time-frequency resources configured with the S-SSB. Optionally, the PSBCH can be mapped outside subcarriers 0 to 131, and on subcarriers corresponding to 0, 1, 129, 130, and 131 on the edge of the S-PSS and S-SSS bandwidth.

Optionally, in this implementation, when mapping S-SSB-related signals or channels on an RB set, except for the synchronization signal that needs to fully map the S-SSB, other signals used to meet the OCB requirements only need to fill the bandwidth of the RB set, and there is no need to fill all the complete S-SSB signals.

Optionally, when the RBs or part of the RBs on the edge of the RB set can also be used, the S-SSB signal can be further filled. Accordingly, when filling as above, the PSBCH needs to perform rate matching on the corresponding symbols and mapped PRBs or REs.

Optionally, in the embodiments of the present application, a normal CP (NCP) structure is taken as an example for schematic illustration, and the technical solution of the present application is also applicable to the schematic diagram of an extended CP (ECP) structure.

Optionally, in an embodiment of the present application, the bandwidth occupied by the S-SSB is predefined, such as 11PRB, or 20PRB, or other values, and the present application does not limit this.

In summary, the scrambled PSBCH is used to distinguish it from the S-SSB on the synchronous RB set, and there is no S-PSS and S-SSS on the asynchronous RB set; different time domain mapping methods are used to distinguish the S-SSB on the asynchronous RB set and the synchronous RB set; different S-PSS and S-SSS sequences are generated to distinguish the S-SSB on the asynchronous RB set and the synchronous RB set. The above implementation methods can reduce the peak-to-average ratio of the signal in the time unit where the S-SSB is located, thereby improving the system transmission performance.

To facilitate understanding and description, the synchronization signal involved in the embodiment of the present application is explained here in conjunction with Figure 8 (b).

As shown in (b) of Figure 8, UE1COT includes 1 synchronous RB set and 3 asynchronous RB sets (i.e., M=4), wherein the time slot where the S-SSB on the synchronous RB set is located (also referred to as the synchronous time slot) includes an S-SSB for synchronization and N S-SSB copies for occupying the channel (such as S-SSB copy 1, S-SSB copy 2, ..., S-SSB copy N), for example, N=9. Exemplarily, the S-SSB copy can be a master synchronization signal of a synchronized S-SSB or a set of frequency domain resources occupied by the master synchronization signal, or a slave synchronization signal of a synchronized S-SSB or a set of frequency domain resources occupied by the slave synchronization signal, or a PSBCH of a synchronized S-SSB or a set of frequency domain resources occupied by the PSBCH. Among them, S-SSB copy 1, S-SSB copy 2, ..., S-SSB copy N can be the same or different, and this application does not limit this. In order to avoid COT interruption of other asynchronous RB sets, UE1 can transmit S-SSB related signal (such as S-PSS, S-SSS, or PSBCH) resources on the synchronous time slot of the asynchronous RB set within the COT. For example, UE1 can completely copy or map one S-SSB used for synchronization and N S-SSB copies used for occupying the channel on the synchronous RB set to the synchronous time slots of the other three asynchronous RB sets. Furthermore, in order to avoid the peak average value ratio (PAPR) problem in the RB set on the synchronous time slot of UE1's COT, UE1 can scramble the S-SSB signal used for synchronization and the S-SSB copy signal used for occupying the channel on the four RB sets within the COT. The specific scrambling method can be described in detail below and will not be explained here. At the same time, in order to avoid the peak average value ratio (PAPR) problem between other multiple asynchronous RB sets. In order to solve the PAPR problem, UE1 can also scramble multiple asynchronous RB sets.

In this embodiment of the present application, the frequency domain resource set may include any of the following:

(1) The frequency domain resource set is a resource block set in the resource pool;

(2) The frequency domain resource set is a set of resource blocks included in the channel occupation time COT of the first terminal device;

(3) the M frequency domain resource sets are located in one synchronization resource block set, and the synchronization resource block set includes the second frequency domain resource set and M-1 first frequency domain resource sets;

(4) The M frequency domain resource sets are located in the M1 frequency domain resource sets on the resource pool, and each resource block set includes M2 frequency domain resource sets; or, the M frequency domain resource sets are located in the M1 frequency domain resource sets on the channel occupancy time COT of the first terminal device, and each resource block set includes M2 frequency domain resource sets.

In the embodiment of the present application, if M frequency domain resource sets are located in one synchronization resource block set, the index of the frequency domain resource set may be any one of the following:

(1) The index of the S-SSB used for synchronization within the resource block, and the index of the S-SSB replica signal within the resource block;

(2) The frequency domain resource index of the S-SSB used for synchronization within the resource block, and the index of the frequency domain resource occupied by the S-SSB replica signal within the resource block;

(3) The index of the position of the S-SSB in the resource block used for synchronization, and the index of the position of the S-SSB replica signal in the resource block.

Optionally, in an embodiment of the present application, if M frequency domain resource sets are located in one synchronization resource block set, the index of the frequency domain resource set includes any one of the following (1), (2), (3):

(1) indexes of M frequency domain resource sets determined by the first terminal device;

(2) The index of the primary synchronization signal in a resource block set (e.g., RB set) or the index of the frequency domain resource set occupied by the primary synchronization signal. For example, if a RB set includes multiple S-PSSs, the index of the RB set is the index corresponding to each S-PSS. Optionally, the index may include the original P-SSS and the index of other copies of the P-SSS used to occupy the channel; or, it may only include the index of each copy. Optionally, the copy of the P-SSS is a signal generated after the transmitted signal includes the original P-SSS signal and/or performs other processing (such as scrambling, cyclic shift, etc.).

(3) An index of a slave synchronization signal in a resource block set, or an index of a frequency domain resource set occupied by a slave synchronization signal. For example, if a plurality of S-SSSs are included in an RB set, the index of the RB set is the index corresponding to each S-SSS. Optionally, the index may include the original S-SSS and the index of a copy of the other S-SSS used to occupy the channel. Optionally, the copy of the S-SSS is a signal generated after the transmitted signal includes the original S-SSS signal and/or performs other processing (such as scrambling, cyclic shift, etc.).

(4) The index of the PSBCH in the resource block set, or the index of the frequency domain resource set occupied by the PSBCH. For example, if an RB set includes multiple PSBCHs, the index of the frequency domain resource set is the index corresponding to each PSBCH.

In an embodiment of the present application, if the frequency domain resource set is a resource block set on a resource pool, or the frequency domain resource set is a resource block set included in the channel occupancy time COT of the first terminal device, then the index fn of the frequency domain resource set is: the index i of the resource block, and the joint index determined by the index j of the S-SSB signal in the resource block. Among them, and the index of the S-SSB signal in the resource block.

Optionally, the index fn of the frequency domain resource set satisfies the following conditions:

fn＝N*i+j，i＝0,1,…,M-1,j＝0,1,…,N-1；or，

fn＝N*i+j+1，i＝0,1,…,M-1,j＝0,1,…,N-1；

Wherein, M represents the number of resource block sets RB set included in the frequency domain resource set, and N represents the number of all S-SSB signals in a resource block set RB set. It should be understood that the number of all S-SSB signals in a resource block set RB set includes S-SSB signals used for synchronization and S-SSB replica signals used for occupying channels.

In this implementation, the index fn of the frequency domain resource set satisfies the following conditions:

fn＝4*i+j，i＝0,1,…,3,j＝0,1,…,8.

In the above example, the index fn of the frequency domain resource set has a total of 4*9=36 values, ranging from 0 to 35.

Exemplarily, UE1 may use a sequence c to scramble 4*9=36 signals on the synchronization time slot within UE1 COT respectively, so as to reduce the peak-to-average ratio of the 36 signals on the synchronization time slot.

For example, UE1 may first use sequence c1 to scramble the S-SSB signals in four RB sets, and then use sequence c2 to scramble the nine S-SSB copies in each RB set to reduce the peak-to-average ratio of the 36 signals on the synchronization time slot. The specific implementation method of scrambling by sequence can refer to the relevant description above, and will not be repeated here for the sake of brevity.

For example, UE1 may first use sequence c2 to scramble the nine S-SSB copies in each RB set, and then use Sequence c1 scrambles the S-SSB signals in the four RB sets respectively to reduce the peak-to-average ratio of the 36 signals on the synchronization time slot. The specific implementation method of scrambling by sequence can refer to the relevant description above, and will not be repeated here for the sake of brevity.

For example, optionally, the S-PSS, S-SSS and/or PSBCH in the S-SSB are scrambled using two sequences respectively, satisfying the following conditions:

ac(i,j)＝(a(0,j)+c1(i,j)+c2(i,j))mod 2,0≤j<L-1,i＝0,1,N-1；

Wherein, ac(i,j) is the scrambled signal, L is the length of the signal a to be scrambled, a(0,j) is the S-PSS, S-SSS or PSBCH in the side synchronization signal block, c1(i,j) and c2(i,j) are random sequences, the initial values of c1(i,j) and c2(i,j) are determined by the identifier of the side synchronization signal sequence and/or the index of the frequency domain resource set, mod represents the modulo operation, N is a positive integer, i is the index of the resource block set RB set, and j is the index of each S-SSB signal in the resource block set.

Optionally, in one example, the initial value C _init of c1(i,j) and/or c2(i,j) satisfies:

C _init = SLSSID + i; or,

C _init = SLSSID*2 ⁿ + i; or,

C _init t＝SLSSID+i*2 ^m ；

C _init = SLSSID + j; or,

C _init = SLSSID*2 ^q + j; or,

C _init = SLSSID + j * 2 ^p ;

Among them, i is the S-SSB index or the index of the frequency domain resource, and m, n, q, and p are integers.

Fig. 14 is a flow chart of a communication method 1300 provided in an embodiment of the present application. As shown in Fig. 13, the method includes the following steps.

S1410, the first terminal device determines a side synchronization signal block and first data.

The side synchronization signal block and the first data are located on different frequency domain resources on the first time unit.

Optionally, the side synchronization signal block and the first data are located on different frequency domain resources on the first time unit, which may include: the side synchronization signal block and the first data are located on the same or different RB sets.

S1420, the first terminal device determines to send or receive the sideline synchronization signal block and/or the first data in the first time unit according to the priority of the sideline synchronization signal block and/or the first data.

Optionally, the side synchronization signal block can be an S-SSB configured in the resource pool or a candidate S-SSB. The difference between the two is that the configured S-SSB resources will be excluded from the resource pool, while the candidate S-SSB resources will not be excluded from the resource pool. In order to distinguish, the configured S-SSB can be called the first synchronization signal block, corresponding to the first resource, and the candidate S-SSB can be called the second synchronization signal block, corresponding to the second resource.

S1430, optionally, the first terminal device sends or receives a side synchronization signal block and/or first data in a first time unit.

It should be noted that the scenarios in which the technical solution of this application is applicable include:

(1) In the synchronous RB set, the S-SSB is frequency-division multiplexed with the data. That is, the side synchronization signal block and the first data are to be sent by the first terminal device in the first time unit. Optionally, this scenario can be considered as frequency division multiplexing within the same transmitting device.

(2) The S-SSB is sent on the synchronous RB set, and the data is sent on the asynchronous RB set, and the two are frequency-division multiplexed. That is, the side synchronization signal block is to be sent by the first terminal device in the first time unit, and the first data is to be received by the first terminal device in the first time unit; or, the side synchronization signal block is to be received by the first terminal device in the first time unit, and the first data is to be sent by the first terminal device in the first time unit. Optionally, this scenario can be considered as frequency division multiplexing within different sending devices, or frequency division multiplexing within the system.

Based on the above scenario, when data and S-SSB are sent in parallel, the first terminal device determines whether only one channel can be sent or both channels can be sent, and the following possible implementation methods are given.

In a possible implementation, when the first time unit is a time domain resource of the first resource, the first terminal device determines to send or receive a side synchronization signal block on the first time unit.

In another possible implementation, when the first time unit is a time domain resource of the second resource, the first terminal device determines to send or receive the side synchronization signal block and/or the first data on the first time unit according to the usage of the first resource.

In one example, when the first terminal device successfully sends the first sideline synchronization signal block on the first resource, the first terminal device determines to send the first data on the first time unit.

In another example, when the first terminal device fails to successfully send the first side synchronization signal block on the first resource, the first terminal device determines to send the side synchronization signal block and/or the first data on the first time unit according to the priority of the side synchronization signal block and/or the first data.

Specifically, when any one of the following conditions is met, the first terminal device determines to send a side synchronization signal block on the first time unit: the priority of the side synchronization signal block is higher than the priority of the first data; the priority of the side synchronization signal block is higher than the configured first priority threshold; the priority of the side synchronization signal block is higher than the priority of the first data, and the priority of the side synchronization signal block is higher than the configured first priority threshold.

Specifically, when any one of the following conditions is met, the first terminal device determines to send the first data on the first time unit: the priority of the first data is higher than the priority of the side synchronization signal block; the priority of the first data is higher than the configured first priority threshold; the priority of the first data is higher than the priority of the side synchronization signal block, and the priority of the first data is higher than the configured first priority threshold.

That is to say, UE-1 is determined based on the priority of S-SSB and the priority of the TB to be sent.

For example: always send S-SSB;

When the priority of the TB to be sent is higher than the priority of the S-SSB, the TB can be sent;

S-SSB is always sent. When the priority of the TB to be sent is higher than the configured priority threshold, the TB is also sent.

Among those sending S-SSB and TB, the one with higher priority;

Only TB or S-SSB with a priority higher than the configured priority threshold is sent;

If both are higher, both will be issued;

If both are below the configured threshold, the one with the highest priority is sent.

In another example, when the first terminal device fails to successfully send the first sideline synchronization signal block on the first resource, the first terminal device determines to send the sideline synchronization signal block and/or the first data on the first time unit according to the indication information.

Specifically, when any one of the following conditions is met, the first terminal device obtains first information, and the first information is used to indicate the sending side line synchronization signal block; the first terminal device obtains second information, and the second information is used to indicate the sending side line synchronization signal block and the first data.

Specifically, when any one of the following conditions is met, the first terminal device determines to send the first data in the first time unit: the first terminal device obtains third information, and the third information is used to indicate the sending of the first data; the first terminal device obtains fourth information, and the fourth information is used to indicate the sending side synchronization signal block and the first data.

That is, UE1 determines whether to perform concurrent operations according to the signaling or determines how to perform concurrent operations according to other conditions or methods.

For example: when the signaling indicates that concurrency is allowed, both are sent, otherwise only S-SSB is sent;

When the signaling indicates that concurrency is allowed, both are sent, otherwise only the one with a higher priority is sent.

According to the above implementation method, the first terminal device needs to comprehensively consider the type of S-SSB, the configured S-SSB transceiver status, and the relationship between the relative priorities of the first data and the side synchronization signal block to determine whether to transmit the first data and the side synchronization signal block concurrently.

Based on the above scenario, when sending S-SSB, the first terminal device needs to determine whether to receive data sent by the second terminal device or send S-SSB in the synchronization time unit (for example, the first time unit). And,

When the second terminal device sends data, the first terminal device needs to determine whether the second terminal device is receiving the S-SSB sent by the first terminal device in the synchronous time unit, or sending data.

In a possible implementation, when the first time unit is a time domain resource of the first resource, the first terminal device determines to send or receive a sideline synchronization signal block on the first time unit.

In another possible implementation, in the case of a time domain resource of the second resource in the first time unit, the first terminal device determines to send or receive a side synchronization signal block and/or first data in the first time unit according to usage of the first resource.

In another example, when the first terminal device does not send or receive the first sideline synchronization signal block on the first resource, the first terminal device determines to send the sideline synchronization signal block and/or the first data on the first time unit according to the priority of the sideline synchronization signal block and/or the first data.

Specifically, when any one of the following conditions is met, the first terminal device determines to send or receive the sideline synchronization signal block on the first time unit: the priority of the sideline synchronization signal block is higher than the priority of the first data; the priority of the sideline synchronization signal block is higher than the configured first priority threshold; the priority of the sideline synchronization signal block is higher than the priority of the first data, and the priority of the sideline synchronization signal block is higher than the configured first priority threshold;

Specifically, when any one of the following conditions is met, the first terminal determines to send or receive the first data on the first time unit: the priority of the first data is higher than the priority of the sideline synchronization signal block; the priority of the first data is higher than the configured first priority threshold; the priority of the first data is higher than the priority of the sideline synchronization signal block, and the priority of the first data is higher than the configured first priority threshold;

In another example, when the first terminal device does not send or receive the first sideline synchronization signal block on the first resource, the first The terminal device determines to send a side synchronization signal block and/or first data in a first time unit according to the indication information.

For example, when the signaling indicates that concurrency is allowed, both are sent, otherwise only S-SSB is sent.

For another example, when the signaling indicates that concurrency is allowed, both are sent, otherwise only the one with a higher priority is sent.

Specifically, when any one of the following conditions is met, the first terminal device determines to send or receive a side line synchronization signal block on the first time unit: the first terminal device obtains first information, and the first information is used to indicate the sending side line synchronization signal block; the first terminal device obtains second information, and the second information is used to indicate the sending side line synchronization signal block and the first data.

Specifically, when any one of the following conditions is met, the first terminal determines to send or receive the first data in the first time unit: the first terminal device obtains third information, and the third information is used to indicate the sending of the first data; the first terminal device obtains fourth information, and the fourth information is used to indicate the sending side synchronization signal block and the first data.

According to the above implementation method, the first terminal device needs to comprehensively consider the type of S-SSB, the configured S-SSB receiving and transmitting status, and the relationship between the relative priorities of the first data and the side synchronization signal block to determine whether to prioritize the first data or the side synchronization signal block. This method can ensure that the terminal device prioritizes more important information and reduce the impact on the system.

It should be noted that, in the present application, the above methods 500, 900 and 1400 can be used independently or in combination. If there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment according to their internal logical relationship.

The above describes in detail the communication method side embodiment of the present application in conjunction with Figures 1 to 14, and the following describes in detail the communication device side embodiment of the present application in conjunction with Figures 15 and 16. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, and therefore, the part not described in detail can refer to the previous method embodiment.

FIG15 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. As shown in FIG15, the device 1000 may include a transceiver unit 1010 and a processing unit 1020. The transceiver unit 1010 may communicate with the outside, the processing unit 1020 is used for data processing, and the transceiver unit 1010 may also be referred to as a communication interface or a transceiver unit.

In one possible design, the device 1000 can implement steps or processes corresponding to those performed by the first terminal device (for example, UE1) in the above method embodiment, wherein the processing unit 1020 is used to perform processing-related operations of the first terminal device in the above method embodiment, and the transceiver unit 1010 is used to perform transceiver-related operations of the first terminal device in the above method embodiment.

In another possible design, the device 1000 can implement steps or processes corresponding to those performed by the second terminal device (for example, UE2) in the above method embodiments, wherein the transceiver unit 1010 is used to perform transceiver-related operations of the second terminal device in the above method embodiments, and the processing unit 1020 is used to perform processing-related operations of the second terminal device in the above method embodiments.

It should be understood that the device 1000 here is embodied in the form of a functional unit. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merged logic circuit and/or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the device 1000 can be specifically the transmitting end in the above-mentioned embodiment, and can be used to execute the various processes and/or steps corresponding to the transmitting end in the above-mentioned method embodiment, or the device 1000 can be specifically the receiving end in the above-mentioned embodiment, and can be used to execute the various processes and/or steps corresponding to the receiving end in the above-mentioned method embodiment. To avoid repetition, it will not be repeated here.

The device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the sending end in the above-mentioned method, or the device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the receiving end in the above-mentioned method. The functions can be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor, respectively performing the transceiver operations and related processing operations in each method embodiment.

In addition, the above-mentioned transceiver unit can also be a transceiver circuit (for example, it can include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit. In an embodiment of the present application, the device in Figure 15 can be the receiving end or the transmitting end in the aforementioned embodiment, or it can be a chip or a chip system, for example: a system on chip (system on chip, SoC). Among them, the transceiver unit can be an input and output circuit, a communication interface. The processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. This is not limited here.

FIG16 shows a schematic block diagram of a communication device 2000 provided in an embodiment of the present application. As shown in FIG16, the device 2000 includes a processor 2010 and a transceiver 2020. The processor 2010 and the transceiver 2020 communicate with each other through an internal connection path, and the processor 2010 is used to execute instructions to control the transceiver 2020 to send signals and/or receive signals.

Optionally, the device 2000 may further include a memory 2030, which communicates with the processor 2010 and the transceiver 2020 via an internal The connection paths communicate with each other. The memory 2030 is used to store instructions, and the processor 2010 can execute the instructions stored in the memory 2030.

In a possible implementation, the apparatus 2000 is used to implement various processes and steps corresponding to the first terminal device (eg, UE1) in the above method embodiment.

In another possible implementation, the apparatus 2000 is used to implement the various processes and steps corresponding to the second terminal device (eg, UE2) in the above method embodiment.

It should be understood that the device 2000 can be specifically the transmitting end or receiving end in the above embodiment, or a chip or a chip system. Correspondingly, the transceiver 2020 can be a transceiver circuit of the chip, which is not limited here. Specifically, the device 2000 can be used to execute each step and/or process corresponding to the transmitting end or receiving end in the above method embodiment.

Optionally, the memory 2030 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type. The processor 2010 may be used to execute instructions stored in the memory, and when the processor 2010 executes instructions stored in the memory, the processor 2010 is used to execute the various steps and/or processes of the above-mentioned method embodiment corresponding to the transmitting end or the receiving end.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The processor in the embodiment of the present application can implement or execute the methods, steps and logic block diagrams disclosed in the embodiment of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to execute, or the hardware and software modules in the decoding processor can be combined and executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

FIG17 is a schematic block diagram of a chip system 3000 provided in an embodiment of the present application. As shown in FIG17 , the chip system 3000 (or also referred to as a processing system) includes a logic circuit 3010 and an input/output interface 3020.

Among them, the logic circuit 3010 can be a processing circuit in the chip system 3000. The logic circuit 3010 can be coupled to the storage unit and call the instructions in the storage unit so that the chip system 3000 can implement the methods and functions of each embodiment of the present application. The input/output interface 3020 can be an input/output circuit in the chip system 3000, outputting information processed by the chip system 3000, or inputting data or signaling information to be processed into the chip system 3000 for processing.

As a solution, the chip system 3000 is used to implement the operations performed by the terminal device in the above method embodiments.

For example, the logic circuit 3010 is used to implement the processing-related operations performed by the first terminal device in the above method embodiment, such as the processing-related operations performed by the first terminal device in the embodiment shown in FIG. 5, or the processing-related operations performed by the first terminal device in the embodiment shown in FIG. 9, or the processing-related operations performed by the first terminal device in the embodiment shown in FIG. 14; the input/output interface 3020 is used to implement the sending and/or receiving-related operations performed by the first terminal device in the above method embodiment, such as the first terminal device in the embodiment shown in FIG. 5 The sending and/or receiving related operations are performed by the first terminal device in the embodiment shown in FIG. 9 , or the sending and/or receiving related operations are performed by the first terminal device in the embodiment shown in FIG. 14 .

For another example, the logic circuit 3010 is used to implement the processing-related operations performed by the second terminal device in the above method embodiments, such as the processing-related operations performed by the second terminal device in the embodiment shown in Figure 5, or the processing-related operations performed by the second terminal device in the embodiment shown in Figure 9, or the processing-related operations performed by the second terminal device in the embodiment shown in Figure 14; the input/output interface 3020 is used to implement the sending and/or receiving-related operations performed by the second terminal device in the above method embodiments, such as the sending and/or receiving-related operations performed by the second terminal device in the embodiment shown in Figure 5, or the sending and/or receiving-related operations performed by the second terminal device in the embodiment shown in Figure 9, or the sending and/or receiving-related operations performed by the second terminal device in the embodiment shown in Figure 14.

An embodiment of the present application also provides a computer-readable storage medium on which computer instructions for implementing the methods executed by a terminal device (such as a first terminal device or a second terminal device) in the above-mentioned method embodiments are stored.

An embodiment of the present application also provides a computer program product, comprising instructions, which, when executed by a computer, implement the methods performed by a terminal device (such as a first terminal device or a second terminal device) in the above-mentioned method embodiments.

An embodiment of the present application also provides a communication system, which includes the first terminal device and the second terminal device in the above embodiments.

The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories, random access memories, magnetic disks, or optical disks.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A communication method, comprising:

The first terminal device determines M frequency domain resource sets, where the M frequency domain resource sets include a first frequency domain resource set and a second frequency domain resource set, where the second frequency domain resource set includes frequency domain resources of sideline synchronization signal resources, and the first frequency domain resource set is other M-1 frequency domain resource sets except the second frequency domain resource set, where M is an integer greater than 1;

The first terminal device sends a sidelink synchronization signal block and a first signal in a first time unit, wherein the sidelink synchronization signal block is located in the second frequency domain resource set, the first signal is located in the first frequency domain resource set, the first signal includes a physical sidelink broadcast channel PSBCH, and the first signal is determined by an index of the frequency domain resource set.
The method according to claim 1 is characterized in that the first signal also includes a side master synchronization signal S-PSS and/or a side slave synchronization signal S-SSS.
The method according to claim 1 or 2, characterized in that the method further comprises:

The first terminal device obtains a channel occupancy time COT, where the COT includes the first frequency domain resource set and the second frequency domain resource set.
The method according to claim 1 or 3 is characterized in that all the first signals are PSBCH.
The method according to any one of claims 1 to 3, characterized in that the method further comprises:

The first terminal device copies the PSBCH of the second frequency domain resource set in the first time unit to the symbol where the PSBCH corresponding to the first frequency domain resource set in the first time unit is located;

The first terminal device copies the PSBCH of the second frequency domain resource set on some symbols of the first time unit to symbols in the first frequency domain resource set corresponding to the S-PSS, S-SSS on the first time unit.
The method according to any one of claims 1 to 3 is characterized in that the first signal also includes S-PSS and/or S-SSS, and the symbol position of the S-PSS in the first frequency domain resource set is different from the symbol position of the S-PSS in the second frequency domain resource set.
The method according to any one of claims 1 to 3, characterized in that the method further comprises:

The first terminal device determines Mt S-PSS sequences, and the Mt S-PSS sequences are determined by the index of the frequency domain resource set, where Mt is a positive integer not greater than M.
The method according to claim 7, characterized in that the Mt S-PSS sequences are determined according to the following method:
S-PSS(i,j)＝(S-PSS(0,j)+c(i,j))mod 2, 0≤j<L-1, 0≤i<Mt-1;

Wherein, L is the length of the S-PSS sequence, the S-PSS (0, j) is the main synchronization signal sequence in the side synchronization signal block, c (i, j) represents the jth code element in the i-th random sequence, the initial value of c (i, j) is determined by the identifier of the side synchronization signal sequence and/or the index of the frequency domain resource set, and mod represents the modulo operation.
The method according to claim 7, characterized in that the Mt S-PSS sequences are determined according to the following method:
S-PSS(i,j)＝S-PSS(0,j)*(1-2*c(i,j)), 0≤j<L-1;

Among them, L is the length of the S-PSS sequence, the S-PSS (0, j) is the main synchronization signal sequence in the side synchronization signal block, c (i, j) represents the jth code element in the i-th random sequence, and the initial value of c (i, j) is determined by the identifier of the side synchronization signal sequence and/or the index i of the frequency domain resource set, and i is an integer.
The method according to any one of claims 1 to 3, characterized in that the method further comprises:

The first terminal device determines Nt S-SSS sequences, and the Nt S-SSS sequences are determined by the index of the frequency domain resource set, where Nt is a positive integer not greater than the M.
The method according to claim 10, characterized in that the Nt S-SSS sequences are determined according to the following method:
S-SSS(i,j)＝(S-SSS(0,j)+c(i,j))mod 2, 0≤j<L-1, 0≤i<Nt-1;

Among them, L is the length of the S-SSS sequence, the S-SSS (0, j) is the slave synchronization signal sequence in the side synchronization signal block, c (i, j) represents the jth code element in the i-th random sequence, the initial value of c (i, j) is determined by the identifier of the side synchronization signal sequence and/or the index of the frequency domain resource set, and mod represents the modulo operation.
The method according to claim 10, characterized in that the Nt S-SSS sequences are determined according to the following method:
S-SSS(i,j)＝S-SSS(0,j)*(1-2*c(i,j)), 0≤j<L-1;

Wherein, L is the length of the S-SSS sequence, the S-SSS(0,j) is the slave synchronization signal sequence in the side synchronization signal block, c(i,j) represents the jth symbol in the i-th random sequence, and the initial value of c(i,j) is determined by the identifier of the side synchronization signal sequence and/or the frequency domain resource set The combination is determined by the index i, which is an integer.
The method according to any one of claims 1 to 3, characterized in that the method further comprises:

The first terminal device determines M S-SSS sequences, and the M S-SSS sequences correspond one-to-one to the indexes of M frequency domain resource sets.
The method according to claim 13, characterized in that the first signal includes M-1 side primary synchronization signals S-PSS, and the method further includes:

The first terminal device scrambles the M-1 S-PSSs according to the M S-SSS sequences.
The method according to claim 13 or 14, characterized in that the first terminal device determines M S-SSS sequences, comprising:

The first terminal device determines the M S-SSS sequences according to the identifier SLSSID_n of the sidelink synchronization signal sequence in the second frequency domain resource set.
The method according to claim 15, characterized in that SLSSID_i in the i-th frequency domain resource set satisfies:

SLSSID_i＝(RBS i -1)*Ms/M+SLSSID_n；or,

SLSSID_i＝(RBS i )*Ms/M+SLSSID_n；

Among them, RBSi is the index of the i-th frequency domain resource set, i is an integer greater than or equal to 1 and less than or equal to M, and the value of SLSSID_n is any integer in [0,1,…,Ms/M], where Ms is a positive integer not less than M.
The method according to any one of claims 1 to 16, characterized in that

The first frequency domain resource set is a first resource block set, and the second frequency domain resource set is a second resource block set.
The method according to any one of claims 1 to 16, characterized in that

The first frequency domain resource set and the second frequency domain resource set are located in the same resource block set.
The method according to claim 18 is characterized in that the side-line synchronization signal block includes a first side-line synchronization signal block and a second side-line synchronization signal block, the first side-line synchronization signal block is located outside the resource pool, and the second side-line synchronization signal block is located inside the resource pool or outside the resource pool.
The method according to claim 19 is characterized in that the first side synchronization signal block accesses the channel using a short control signaling method, and the second side synchronization signal block accesses the channel using a perception method.
The method according to claim 20 is characterized in that the accessing the channel using short control signaling includes: accessing the channel without using a perception method, or accessing the channel using a type 2A channel access method.
The method according to claim 20 or 21 is characterized in that the access channel using short control signaling satisfies: the duty cycle of sending the first side synchronization signal does not exceed 1/20.
The method according to any one of claims 18 to 22, characterized in that

The starting and ending positions of the frequency domain resources occupied by the PSBCH in the sideline synchronization signal block are: subcarrier 0 to subcarrier 131;

The starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS in the side synchronization signal block are: subcarrier 2 to subcarrier 128.
The method according to any one of claims 1 to 23, characterized in that the first signal is determined by an index of the frequency domain resource set, comprising:

The first terminal device generates a first sequence, an integer of 1≤i≤M, according to the index of the i-th frequency domain resource set;

The first terminal device scrambles the PSBCH on the i-th frequency domain resource set on the first time unit according to the first sequence.
The method according to any one of claims 1 to 24, characterized in that the first signal is determined by an index of the frequency domain resource set, comprising:

The first terminal device generates a first sequence according to an index of the first frequency domain resource set;

The first terminal device scrambles the PSBCH on the first frequency domain resource set on the first time unit according to the first sequence.
The method according to any one of claims 24 or 25, characterized in that

The first sequence is a random sequence, and an initial value of the random sequence is determined by an identifier of a sideline synchronization signal sequence and/or an index of the i-th frequency domain resource set, or;

The first sequence is a random sequence, and an initial value of the random sequence is determined by an identifier of a sidelink synchronization signal sequence and/or an index of the first frequency domain resource set.
The method according to any one of claims 1 to 26, characterized in that the frequency domain resource set includes any one of the following:

The frequency domain resource set is a resource block set included in the resource pool;

The frequency domain resource set is a resource block set included in the channel occupancy time COT of the first terminal device;

The M frequency domain resource sets are located in one synchronization resource block set, and the synchronization resource block set includes the second frequency domain resource set and the M-1 first frequency domain resource sets;

The M frequency domain resource sets are M1 frequency domain resource sets located in a resource pool, wherein each of the resource block sets includes M2 frequency domain resource sets; or,

The M frequency domain resource sets are M1 frequency domain resource sets located on the channel occupancy time COT of the first terminal device, wherein each of the resource block sets includes M2 frequency domain resource sets.
The method according to any one of claims 1 to 27, characterized in that the index of the frequency domain resource set includes any one of the following:

An index of the M frequency domain resource sets determined by the first terminal device;

An index of a primary synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a primary synchronization signal in a resource block set;

An index of a slave synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a slave synchronization signal in a resource block set;

The index of the PSBCH in the resource block set or the index of the frequency domain resource set occupied by the PSBCH in the resource block set.
The method according to any one of claims 1 to 28, characterized in that the index of the i-th frequency domain resource set is determined according to any one of the following:

The index of the i-th frequency domain resource set;

a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set;

an absolute value of a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set;

a sum of a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set and M;

A parameter value configured for the frequency domain resource set.
The method according to any one of claims 1 to 29 is characterized in that the PSBCH includes a reference signal for PSBCH demodulation, the reference signal for PSBCH demodulation is generated by a second random sequence, and the initial value of the second random sequence is determined by the identifier of the side synchronization signal sequence and/or the index of the first frequency domain resource set.
The method according to any one of claims 8 to 30, characterized in that the initial value of the random sequence used to scramble the S-PSS, S-SSS and/or PSBCH in the i-th frequency domain resource set is determined according to any one of the following expressions:

or,

or,

Wherein, c init (i) is the initial value of the random sequence, the value of i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, wherein k is an integer greater than or equal to 10, q is an integer greater than or equal to 1, and (q+k)≤31, represents the identifier of the sideline synchronization signal sequence, and floor(x) represents rounding down x.
A communication method, comprising:

The second terminal device receives indication information from the first terminal device, where the indication information indicates the first frequency domain resource set and/or the second frequency domain resource set;

The second terminal device receives a sideline synchronization signal block on the second frequency domain resource set on the first time unit;

Among them, the second frequency domain resource set includes frequency domain resources of side synchronization signal resources, the first frequency domain resource set is the other M-1 frequency domain resource sets among the M frequency domain resource sets except the second frequency domain resource set, the M frequency domain resource sets are determined by the first terminal device, and M is an integer greater than 1.
The method according to claim 32, characterized in that the method further comprises:

The second terminal device receives a first signal on the first frequency domain resource set on the first time unit, the first signal including a physical side broadcast channel PSBCH, and the first signal is determined by an index of the frequency domain resource set.
The method according to claim 33, characterized in that

The first signal further includes a side primary synchronization signal S-PSS and/or a side slave synchronization signal S-SSS.
The method according to claim 34 is characterized in that all of the first signals are PSBCH.
The method according to claim 33 or 34 is characterized in that the first signal also includes S-PSS and/or S-SSS, and the symbol position of the S-PSS in the first frequency domain resource set is different from the symbol position of the S-PSS in the second frequency domain resource set.
The method according to any one of claims 32 to 36, characterized in that

The first frequency domain resource set is a first resource block set, and the second frequency domain resource set is a second resource block set.
The method according to any one of claims 32 to 36, characterized in that

The first frequency domain resource set and the second frequency domain resource set are located in the same resource block set.
The method according to claim 38 is characterized in that the side-line synchronization signal block includes a first side-line synchronization signal block and a second side-line synchronization signal block, the first side-line synchronization signal block is located outside the resource pool, and the second side-line synchronization signal block is located inside the resource pool or outside the resource pool.
The method according to claim 39 is characterized in that the first side synchronization signal block accesses the channel using a short control signaling method, and the second side synchronization signal block accesses the channel using a perception method.
The method according to claim 40 is characterized in that the accessing the channel using short control signaling includes: accessing the channel without using a perception method, or accessing the channel using a type 2A channel access method.
The method according to claim 39 or 40 is characterized in that the access channel using short control signaling satisfies: the duty cycle of sending the first side synchronization signal does not exceed 1/20.
The method according to any one of claims 38 to 42, characterized in that

The starting and ending positions of the frequency domain resources occupied by the PSBCH in the sideline synchronization signal block are: subcarrier 0 to subcarrier 131;

The starting and ending positions of the frequency domain resources occupied by the S-PSS and/or S-SSS in the side synchronization signal block are: subcarrier 2 to subcarrier 128.
The method according to any one of claims 32 to 40, characterized in that the frequency domain resource set includes any one of the following:

The frequency domain resource set is a resource block set included in the resource pool;

The frequency domain resource set is a resource block set included in the channel occupancy time COT of the first terminal device;

The M frequency domain resource sets are located in one synchronization resource block set, and the synchronization resource block set includes the second frequency domain resource set and the M-1 first frequency domain resource sets;

The M frequency domain resource sets are M1 frequency domain resource sets located in a resource pool, wherein each of the resource block sets includes M2 frequency domain resource sets; or,

The M frequency domain resource sets are M1 frequency domain resource sets located on the channel occupancy time COT of the first terminal device, wherein each of the resource block sets includes M2 frequency domain resource sets.
The method according to any one of claims 32 to 44, characterized in that the index of the frequency domain resource set includes any one of the following:

An index of the M frequency domain resource sets determined by the first terminal device;

An index of a primary synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a primary synchronization signal in a resource block set;

An index of a slave synchronization signal in a resource block set or an index of a frequency domain resource set occupied by a slave synchronization signal in a resource block set;

The index of the PSBCH in the resource block set or the index of the frequency domain resource set occupied by the PSBCH in the resource block set.
The method according to any one of claims 32 to 45, characterized in that the index of the i-th frequency domain resource set is determined according to any one of the following:

The index of the i-th frequency domain resource set;

a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set;

an absolute value of a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set;

a sum of a difference between an index of the first frequency domain resource set and an index of the second frequency domain resource set and M;

A parameter value configured for the frequency domain resource set.
The method according to any one of claims 1 to 46 is characterized in that the PSBCH includes a reference signal for PSBCH demodulation, the reference signal for PSBCH demodulation is generated by a second random sequence, and the initial value of the second random sequence is determined by the identifier of the side synchronization signal sequence and/or the index of the first frequency domain resource set.
The method according to any one of claims 1 to 47, characterized in that the initial value of the random sequence used to scramble the S-PSS, S-SSS and/or PSBCH in the i-th frequency domain resource set is determined according to any one of the following expressions:

or,

or,

Wherein, c init (i) is the initial value of the random sequence, the value of i is any integer from 0 to M-1, or from 1 to M, or from 1 to M-1, wherein k is an integer greater than or equal to 10, q is an integer greater than or equal to 1, and (q+k)≤31, Indicates the side synchronization The sequence identifier of the signal, floor(x) means rounding x down.
A communication device, characterized in that it comprises a module or unit for executing the method described in any one of claims 1 to 31, or a module or unit for executing the method described in any one of claims 42 to 48.
A communication device, characterized in that the device includes a processor, the processor is coupled to a memory, the memory stores instructions, and when the instructions are executed by the processor, the processor executes the method as described in any one of claims 1 to 31, or the processor executes the method as described in any one of claims 42 to 48.
A communication system comprises a first terminal device and a second terminal device, wherein the first terminal device is used to execute the method as claimed in any one of claims 1 to 31, and the second terminal device is used to execute the method as claimed in any one of claims 42 to 48.
A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program, and when the computer program is run on a computer, the computer executes the method as described in any one of claims 1 to 31, or the computer executes the method as described in any one of claims 42 to 48.
A computer program product, characterized in that the computer program product includes a computer program or instructions for executing the method as described in any one of claims 1 to 31, or the computer program product includes a computer program or instructions for executing the method as described in any one of claims 42 to 48.