CN115004810A

CN115004810A - Communication method and device

Info

Publication number: CN115004810A
Application number: CN202080094808.4A
Authority: CN
Inventors: 黄海宁; 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2022-09-02
Also published as: WO2021159538A1

Abstract

The embodiment of the invention discloses a communication method and a communication device, wherein the number of modulation symbols after SCI (security context indicator) coding of second-level sidelink control information is determined according to configuration parameters of a resource pool; determining the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI; and transmitting first information to the terminal equipment through a physical layer side uplink shared channel PSSCH, wherein the first information comprises the coded second-level SCI. The embodiment of the invention can improve the reliability of information transmission.

Description

Communication method and device

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a communication method and a communication device.

Background

In a New Radio (NR) Uu, the Uu is an uplink or a downlink between a terminal device and a network device, and when a Physical Uplink Shared Channel (PUSCH) carries Uplink Control Information (UCI) and uplink shared data (UL-SCH), the terminal device may multiplex the UCI on the psch for transmission, specifically, the UCI determines the number of coded bits through rate matching, and then multiplexes the UCI with the UL-SCH and maps the UCI to the PUSCH. The number of Resource Elements (REs) used in rate matching is determined based on data. In NR car networking (V2X), when second-level Sidelink Control Information (SCI) is transmitted in a physical sidelink shared channel (psch) with Sidelink (SL) -shared data (SCH), the same method as that used in NR Uu may be used to determine the number of used REs in the process of rate matching. However, since the correlation degree between the data and the second-level SCI is small, the number of REs for determining the second-level SCI according to the data is large, so that the code rate of the PSSCH is increased, and the reliability of information transmission is reduced.

Disclosure of Invention

The embodiment of the invention discloses a communication method and a communication device, which are used for improving the reliability of information transmission.

The first aspect discloses a communication method, which determines the number of modulation symbols after encoding of a second-level SCI according to configuration parameters of a resource pool, determines the encoded second-level SCI according to the number of modulation symbols after encoding of the second-level SCI, and sends first information to a terminal device through a PSSCH, where the first information may include the encoded second-level SCI. Therefore, when the number of modulation symbols coded by the second-level SCI is determined, the number is determined according to the configuration parameters of the resource pool, and the correlation degree between the configuration parameters of the resource pool and the second-level SCI is high, so that the number of the modulation symbols coded by the second-level SCI can be ensured not to be too large, the code rate of the second-level SCI and the code rate of the PSSCH can be ensured, and the reliability of information transmission can be improved.

As a possible implementation manner, the configuration parameters of the resource pool may include a format of a physical layer sidelink control channel (PSCCH) corresponding to the resource pool, a Cyclic Redundancy Check (CRC) of the first-stage SCI, a number of physical resource block candidates (PRBs) of the PSCCH supported by the resource pool, and a number of time domain symbols of the PSCCH. When determining the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool, the code rate of the first-level SCI may be determined according to the format, the CRC of the first-level SCI, the number of the candidate PRBs, and the number of the time-domain symbols, and then the number of modulation symbols after the second-level SCI coding may be determined according to the code rate of the first-level SCI. It can be seen that when the number of modulation symbols after the second-level SCI encoding is determined, the number is determined according to the code rate of the first-level SCI, and the correlation degree between the first-level SCI and the second-level SCI is large, so that the decoding performance of the second-level SCI is met, the determined number of modulation symbols after the second-level SCI encoding is not too large, the code rate of the second-level SCI and the code rate of the PSSCH are ensured, and the reliability of information transmission is improved.

As a possible implementation manner, when the code rate of the first-level SCI is determined according to the format, the CRC of the first-level SCI, the number of the candidate PRBs, and the number of the time-domain symbols, the bit number of the first-level SCI may be determined according to the format, the bit number after the first-level SCI is encoded is determined according to the number of the candidate PRBs and the number of the time-domain symbols, and the code rate of the first-level SCI is determined according to the bit number of the first-level SCI, the CRC of the first-level SCI, and the bit number after the first-level SCI is encoded.

As a possible implementation manner, when the number of bits after the first-level SCI coding is determined according to the number of the candidate PRBs and the number of the time domain symbols, the number of modulation symbols after the first-level SCI coding may be determined according to the number of the candidate PRBs and the number of the time domain symbols, and the number of bits after the first-level SCI coding may be determined according to the number of modulation symbols after the first-level SCI coding and the modulation order of the first-level SCI.

As a possible implementation manner, when the number of modulation symbols after the second-level SCI encoding is determined according to the code rate of the first-level SCI, the number of modulation symbols after the second-level SCI encoding may be determined according to the code rate of the first-level SCI, the number of bits of the second-level SCI, and the number of bits of the CRC of the second-level SCI.

As a possible implementation manner, when the number of modulation symbols after the second-level SCI encoding is determined according to the code rate of the first-level SCI, the number of modulation symbols after the second-level SCI encoding may be determined according to the code rate of the first-level SCI, the number of bits of the second-level SCI, the number of bits of the CRC of the second-level SCI, and the first parameter.

As a possible implementation manner, when determining the encoded second-level SCI according to the number of modulation symbols after the second-level SCI encoding, the number of bits after the second-level SCI encoding may be determined according to the number of modulation symbols after the second-level SCI encoding, and then the encoded second-level SCI may be determined according to the number of bits after the second-level SCI encoding. The encoded second-level SCI is the second-level SCI after the channel encoding process.

As a possible implementation manner, the first information may be mapped to transmission resources of the PSSCH according to a first rule, and the encoded second-level SCI is mapped from a first PSSCH symbol carrying a corresponding demodulation reference signal (DMRS) in time domain mapping.

As a possible implementation, the first rule may be that in case that the scheduling bandwidth of the PSSCH is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and in case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table. The first rule may also be that the scheduling bandwidth of the PSSCH is not equal to the number of candidate PRBs. The first rule may also be that the scheduling bandwidth of the psch is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of the candidate PRBs. The first rule may also be that the bandwidth of the psch carrying the DMRS is not less than a third threshold number of PRBs. In case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is defined. The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs, so that the problem that the definition of the PSSCH symbol carrying the DMRS is unclear when the PSCCH and the PSSCH are not subjected to frequency division multiplexing can be avoided.

As a possible implementation manner, the first information may further include coded first data, and the coded first data may be mapped starting from a first PSCCH symbol after a last symbol of the PSCCH if the second rule is satisfied. The performance of the PSSCH can be ensured, the probability of successful decoding of the PSSCH is improved, and the transmission reliability of the PSSCH can be improved.

As a possible implementation, the second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs.

As a possible implementation, the second rule may be that the subchannel size of the resource pool is smaller than a second threshold.

As a possible implementation manner, the number of modulation symbols after the second-level SCI encoding does not exceed the fifth threshold.

The second aspect discloses a communication method, which receives first information including a coded second-level SCI from a terminal device through a PSSCH, determines the number of modulation symbols coded by the second-level SCI according to configuration parameters of a resource pool, and decodes the coded second-level SCI according to the number of modulation symbols coded by the second-level SCI to obtain the second-level SCI. Therefore, when the number of modulation symbols coded by the second-level SCI is determined, the number is determined according to the configuration parameters of the resource pool, and the correlation degree between the configuration parameters of the resource pool and the second-level SCI is high, so that the number of the modulation symbols coded by the second-level SCI can be ensured not to be too large, the code rate of the second-level SCI and the code rate of the PSSCH can be ensured, and the reliability of information transmission can be improved.

As a possible implementation manner, the configuration parameters of the resource pool include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time domain symbols of the PSCCH. When the number of modulation symbols after the second-level SCI coding is determined according to the configuration parameters of the resource pool, the code rate of the first-level SCI can be determined according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols, and then the number of modulation symbols after the second-level SCI coding can be determined according to the code rate of the first-level SCI. Therefore, when the number of the modulation symbols coded by the second-level SCI is determined, the number is determined according to the code rate of the first-level SCI, and the correlation degree between the first-level SCI and the second-level SCI is high, so that the decoding performance of the second-level SCI is met, the determined number of the modulation symbols coded by the second-level SCI can be ensured not to be too large, the code rate of the second-level SCI and the code rate of PSSCH can be ensured, and the reliability of information transmission can be improved.

As a possible implementation manner, when the code rate of the first-level SCI is determined according to the format, the CRC of the first-level SCI, the number of the candidate PRBs, and the number of the time-domain symbols, the bit number of the first-level SCI may be determined according to the format, the bit number after the first-level SCI is encoded is determined according to the number of the candidate PRBs and the number of the time-domain symbols, and the code rate of the first-level SCI is determined according to the bit number of the first-level SCI, the bit number of the CRC of the first-level SCI, and the bit number after the first-level SCI is encoded.

As a possible implementation manner, when the encoded second-level SCI is decoded according to the number of modulation symbols encoded by the second-level SCI to obtain the second-level SCI, the number of bits encoded by the second-level SCI may be determined according to the number of modulation symbols encoded by the second-level SCI, and then the encoded second-level SCI is decoded according to the number of bits encoded by the second-level SCI to obtain the second-level SCI. The encoded second-level SCI is the second-level SCI after the channel encoding process.

As a possible implementation manner, the first information may be demapped from the transmission resource of the PSSCH according to a first rule, and the encoded second-level SCI is demapped from the first PSSCH symbol carrying the corresponding DMRS during time domain demapping.

As a possible implementation, the first rule: may be that in case that the scheduling bandwidth of the PSSCH is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and in case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table; the scheduling bandwidth of the PSSCH can also be unequal to the number of the candidate PRBs; the scheduling bandwidth of the PSSCH may also be not less than the first threshold number of PRBs when the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs. The bandwidth of the psch carrying the DMRS may also be not less than a third threshold number of PRBs. In case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is defined. The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs, so that the problem that the definition of the PSSCH symbol carrying the DMRS is unclear when the PSCCH and the PSSCH are not subjected to frequency division multiplexing can be avoided.

As a possible implementation manner, the first information may further include encoded first data, and the encoded first data may be demapped starting from a first PSCCH symbol after a last symbol of the PSCCH if the second rule is satisfied. The performance of the PSSCH can be ensured, the probability of successful decoding of the PSSCH is improved, and the transmission reliability of the PSSCH can be improved.

A third aspect discloses a communication method, which obtains a value of a second parameter according to information of first data, determines the number of modulation symbols after second-level SCI coding according to the value of the second parameter, determines the second-level SCI after coding according to the number of modulation symbols after second-level SCI coding, and sends the first information to a terminal device through PSSCH, wherein the first information includes the first data after coding, the second-level SCI after coding, and indication information for indicating the value of the second parameter. Therefore, when the number of modulation symbols coded by the second-level SCI is determined, the number is determined according to the value of the second parameter, the performance of the second-level SCI is ensured, the number of modulation symbols coded by the second-level SCI is not too large, the code rate of the PSSCH is ensured, and the reliability of information transmission is improved.

As a possible implementation manner, when the number of modulation symbols after the second-level SCI coding is determined according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding may be determined according to the number of bits of the first data, the number of bits of the second-level SCI, the number of REs available on the psch for carrying the second-level SCI, and the value of the second parameter.

As a possible implementation manner, when determining the encoded second-level SCI according to the number of modulation symbols after the second-level SCI encoding, the number of bits after the second-level SCI encoding may be determined according to the number of modulation symbols after the second-level SCI encoding, and then the encoded second-level SCI may be determined according to the number of bits after the second-level SCI encoding.

As a possible implementation, the information of the first data may include a modulation order and a code rate of the first data.

As a possible implementation manner, the first information may be mapped to the transmission resources of the psch according to a first rule, and the encoded second-level SCI is mapped from the first psch symbol carrying the corresponding DMRS during time domain mapping.

As a possible implementation manner, the first rule may be that, in a case where the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, the first psch symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and in a case where the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool, the first psch symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table. The first rule may also be that the scheduling bandwidth of the PSCCH is not equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the bandwidth of the psch carrying the DMRS is not less than a third threshold number of PRBs. In case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is defined. The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs, so that the problem that the definition of the PSSCH symbol carrying the DMRS at the first time is unclear when the PSCCH and the PSSCH are not subjected to frequency division multiplexing can be solved.

As a possible implementation, the first encoded data may be mapped starting from the first PSCCH symbol after the last symbol of the PSCCH, if the second rule is satisfied. The performance of the PSSCH can be ensured, the probability of successful decoding of the PSSCH is improved, and the transmission reliability of the PSSCH can be improved.

As a possible implementation manner, the number of modulation symbols after the second-level SCI coding does not exceed the fifth threshold.

As a possible implementation manner, the value of the second parameter is determined according to the configuration parameter of the resource pool, the bit number of the second SCI, and the bit number of the CRC of the second-level SCI.

The fourth aspect discloses a communication method, which receives first information including a coded second-level SCI and indication information for indicating a value of a second parameter from a terminal device through a PSSCH, acquires the value of the second parameter according to the indication information, determines the number of modulation symbols coded by the second-level SCI according to the value of the second parameter, and decodes the coded second-level SCI according to the number of modulation symbols coded by the second-level SCI to obtain the second-level SCI. Therefore, when the number of modulation symbols coded by the second-level SCI is determined, the number is determined according to the value of the second parameter, the performance of the second-level SCI is ensured, the number of modulation symbols coded by the second-level SCI is not too large, the code rate of the PSSCH is ensured, and the reliability of information transmission is improved.

As a possible implementation manner, when the encoded second-level SCI is decoded according to the number of modulation symbols encoded by the second-level SCI to obtain the second-level SCI, the number of bits encoded by the second-level SCI may be determined according to the number of modulation symbols encoded by the second-level SCI, and then the encoded second-level SCI is decoded according to the number of bits encoded by the second-level SCI to obtain the second-level SCI.

As a possible implementation manner, the first information may be demapped from the psch according to a first rule, and the encoded second-level SCI is demapped from the first psch symbol carrying the corresponding DMRS when performing time domain demapping.

As a possible implementation, the first rule may be that, in a case where the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, the first psch symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and in a case where the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool, the first psch symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table. The first rule may also be that the scheduling bandwidth of the PSSCH is not equal to the number of candidate PRBs for the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the bandwidth of the psch carrying the DMRS is not less than a third threshold number of PRBs. In case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is defined. The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs, so that the problem that the definition of the PSSCH symbol carrying the DMRS at the first time is unclear when the PSCCH and the PSSCH are not subjected to frequency division multiplexing can be solved.

As a possible implementation manner, the first information may further include encoded first data, and the encoded first data may be demapped starting from a first PSCCH symbol after a last symbol of the PSCCH if the second rule is satisfied.

As a possible implementation, the second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs. The performance of the PSSCH can be ensured, the probability of successful decoding of the PSSCH is improved, and the transmission reliability of the PSSCH can be improved.

A fifth aspect discloses a communication apparatus comprising:

the first determining unit is used for determining the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool;

a second determining unit, configured to determine the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI;

and the sending unit is used for sending first information to the terminal equipment through the PSSCH, wherein the first information comprises the coded second-level SCI.

As a possible implementation manner, the configuration parameters of the resource pool include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time domain symbols of the PSCCH;

the first determining unit is specifically configured to:

determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols;

and determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.

As a possible implementation manner, the determining, by the first determining unit, the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols includes:

determining the bit number of the first-stage SCI according to the format;

determining the bit number of the coded first-level SCI according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the code rate of the first-level SCI according to the bit number of the first-level SCI, the CRC bit number of the first-level SCI and the coded bit number of the first-level SCI.

As a possible implementation manner, the determining, by the first determining unit, the number of bits after the first-level SCI is encoded according to the number of the candidate PRBs and the number of the time-domain symbols includes:

determining the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the bit number of the first-stage SCI after coding according to the number of the modulation symbols of the first-stage SCI after coding and the modulation order of the first-stage SCI.

As a possible implementation manner, the determining, by the first determining unit, the number of modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI includes:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI and the bit number of the CRC of the second-level SCI.

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and a first parameter.

As a possible implementation manner, the second determining unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and determining the coded second-level SCI according to the coded bit number of the second-level SCI.

As a possible implementation manner, the apparatus further includes:

and a mapping unit, configured to map the first information to the transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is mapped from a first PSSCH symbol carrying a corresponding DMRS during time domain mapping.

As a possible implementation manner, the first rule is:

in the event that the PSSCH's scheduling bandwidth is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined from the PSSCH DMRS table, and in the event that the PSSCH's scheduling bandwidth is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined from the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or alternatively

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.

As a possible implementation manner, the first information further includes coded first data, and the mapping unit is further configured to map the coded first data starting from a first PSCCH symbol after a last symbol of the PSCCH when a subchannel size of the resource pool is smaller than a second threshold.

A sixth aspect discloses a communication apparatus comprising:

a receiving unit, configured to receive first information from a terminal device through a psch, where the first information includes a coded second-level SCI;

a determining unit, configured to determine the number of modulation symbols after the second-level SCI coding according to configuration parameters of a resource pool;

and the decoding unit is used for decoding the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.

As a possible implementation manner, the configuration parameters of the resource pool include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, a number of candidate PRBs of the PSCCH supported by the resource pool, and a number of time domain symbols of the PSCCH;

the determining unit is specifically configured to:

and determining the number of the modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.

As a possible implementation manner, the determining, by the determining unit, the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols includes:

determining the bit number of the first-stage SCI according to the format;

As a possible implementation manner, the determining, by the determining unit, the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols includes:

As a possible implementation manner, the determining, by the determining unit, the number of modulation symbols after encoding by the second-level SCI according to the code rate of the first-level SCI includes:

As a possible implementation manner, the decoding unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols after the second-level SCI codes;

and decoding the coded second-level SCI according to the bit number of the coded second-level SCI to obtain the second-level SCI.

As a possible implementation manner, the apparatus further includes:

and a demapping unit, configured to demap the first information from the transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding DMRS when performing time domain demapping.

As a possible implementation manner, the first rule is:

As a possible implementation manner, the first information further includes coded first data, and the demapping unit is further configured to, in a case that a size of a sub-channel of the resource pool is smaller than a second threshold, demapp the coded first data starting from a first PSCCH symbol after a last symbol of the PSCCH.

A seventh aspect discloses a communication apparatus comprising:

an acquisition unit configured to acquire a value of the second parameter based on information of the first data;

a first determining unit, configured to determine the number of modulation symbols after the second-level SCI coding according to the value of the second parameter;

a sending unit, configured to send first information to a terminal device through the psch, where the first information includes the coded first data, the coded second-level SCI, and indication information indicating a value of the second parameter.

As a possible implementation manner, the first determining unit is specifically configured to determine the number of modulation symbols after the second-level SCI is encoded according to the bit number of the first data, the bit number of the second-level SCI, the number of REs that can be used to carry the second-level SCI on the PSSCH, and the value of the second parameter.

As a possible implementation manner, the information of the first data includes a modulation order and a code rate of the first data.

As a possible implementation manner, the apparatus further includes:

As a possible implementation manner, the first rule is:

in the case that the scheduling bandwidth of the PSSCH is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, the first PSSCH symbol carrying the corresponding DMRS is a first DMRS symbol determined according to the PSSCH DMRS table, and in the case that the scheduling bandwidth of the PSSCH is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is a second DMRS symbol determined according to the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or

As a possible implementation manner, the mapping unit is further configured to map the coded first data from a first PSCCH symbol after a last symbol of the PSCCH when a subchannel size of the resource pool is smaller than a second threshold.

An eighth aspect discloses a communication apparatus comprising:

a receiving unit, configured to receive first information from a terminal device through a psch, where the first information includes a coded second-level SCI and indication information indicating a value of a second parameter;

an acquisition unit, configured to acquire a value of the second parameter according to the indication information;

a determining unit, configured to determine, according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding;

As a possible implementation manner, the determining unit is specifically configured to determine the number of modulation symbols after the second-level SCI is encoded according to the bit number of the first data, the bit number of the second-level SCI, the number of REs that can be used to carry the second-level SCI on the PSSCH, and the value of the second parameter.

and carrying out inverse processing on the decoded second-level SCI according to the bit number of the second-level SCI after encoding to obtain the second-level SCI.

As a possible implementation manner, the apparatus further includes:

a demapping unit, configured to demap the first information from the PSSCH according to a first rule, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding DMRS when performing time domain demapping.

As a possible implementation manner, the first rule is:

As a possible implementation manner, the first information further includes coded first data, and the demapping unit is further configured to, in a case that a size of a sub-channel of the resource pool is smaller than a second threshold, demapp the coded first data from a first PSCCH symbol after a last symbol of the PSCCH.

A ninth aspect discloses a communication apparatus, which may be a terminal device or a module (e.g., a chip) within a terminal device. The communication device comprises a processor, a memory, an input interface for receiving information from other communication devices than the communication device, and an output interface for outputting information to other communication devices than the communication device, wherein the processor executes a computer program stored in the memory to cause the processor to execute the communication method disclosed in the first aspect or any implementation manner of the first aspect.

A tenth aspect discloses a communication apparatus, which may be a terminal device or a module (e.g., a chip) within the terminal device. The communication device comprises a processor, a memory, an input interface for receiving information from a communication device other than the communication device, and an output interface for outputting information to the communication device other than the communication device, wherein the processor executes a computer program stored in the memory to cause the processor to execute the communication method disclosed in the second aspect or any implementation manner of the second aspect.

An eleventh aspect discloses a communication apparatus, which may be a terminal device or a module (e.g., a chip) within the terminal device. The communication device comprises a processor, a memory, an input interface for receiving information from other communication devices than the communication device, and an output interface for outputting information to other communication devices than the communication device, wherein the processor executes a computer program stored in the memory to cause the processor to execute the communication method disclosed in any implementation manner of the third aspect or the third aspect.

A twelfth aspect discloses a communication apparatus, which may be a terminal device or a module (e.g., a chip) within the terminal device. The communication device comprises a processor, a memory, an input interface for receiving information from other communication devices than the communication device, and an output interface for outputting information to other communication devices than the communication device, wherein the processor executes a computer program stored in the memory to cause the processor to execute the communication method disclosed in any implementation manner of the fourth aspect or the fourth aspect.

A thirteenth aspect discloses a computer readable storage medium having stored thereon a computer program or computer instructions which, when run, implement a communication method as disclosed in the first aspect or any implementation of the first aspect, or the second aspect or any implementation of the second aspect, or the third aspect or any implementation of the third aspect, or the fourth aspect or any implementation of the fourth aspect.

A fourteenth aspect provides a computer program product comprising computer program code which, when run, causes the communication method of the first, second, third or fourth aspect described above to be performed.

A fifteenth aspect discloses a communication system comprising the communication apparatus of the ninth aspect and the communication apparatus of the tenth aspect.

A sixteenth aspect discloses a communication system comprising the communication device of the eleventh aspect and the communication device of the twelfth aspect.

Drawings

FIG. 1 is a schematic view of a V2X according to the present invention;

FIG. 2 is a diagram illustrating communication between UEs according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an air interface resource according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a network architecture according to an embodiment of the present invention;

fig. 5 is a flow chart of a communication method according to an embodiment of the present invention;

FIG. 6 is a flow chart illustrating another communication method disclosed in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 9 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 10 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 11 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 12 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention;

fig. 13 is a flow chart illustrating another communication method according to the embodiment of the present invention;

fig. 14 is a flowchart illustrating another communication method according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention discloses a communication method and a communication device, which are used for improving the reliability of information transmission. The following are detailed below.

The embodiment of the present invention is applicable to SL communication, and in order to better understand a communication method and apparatus disclosed in the embodiment of the present invention, an application scenario of the embodiment of the present invention is described below. The following description will be given taking V2X as an example for communication between a vehicle and anything. With the increasing demand for communication, the fifth generation communication concept-everything interconnection has gradually come into the field of people. Under the network of Long Term Evolution (LTE) technology proposed by the third generation partnership project (3 GPP), the V2X technology is proposed. Referring to fig. 1, fig. 1 is a schematic diagram of a V2X according to an embodiment of the present invention, and as shown in fig. 1, V2X includes communication between a vehicle and a vehicle (V2V), communication between a vehicle and a pedestrian (V2P), communication between a vehicle and an infrastructure (V2I), and communication between a vehicle and a network (V2N). Communication between V2X is via SL. The embodiment of the present invention may be applied to SL communication other than V2X, in addition to V2X, and is not limited herein. For example, referring to fig. 2, fig. 2 is a schematic diagram illustrating a User Equipment (UE) communicating with each other according to an embodiment of the present invention. As shown in fig. 2, UE1 communicates with UE2 over SL.

In the lte v2X, there is only broadcast service, and the broadcast service has no limitation on the receiving end, that is, the transmitting end transmits data, and any terminal device can be used as the receiving end to receive the data. In order to ensure the reliability of the broadcast service and perform data repeat transmission, in addition to the broadcast service, a unicast service and a multicast service are introduced into the NR V2X. Unicast traffic is a traffic limited communication between a pair of terminal devices, i.e. one terminal device transmits data and the other terminal device receives data. A multicast service is a communication that is restricted to a group, where one end device in the group sends data and the other end devices in the group receive the data.

In LTE V2X, there is a PSCCH for transmitting data and a PSCCH for transmitting SCI. In NR V2X, since unicast traffic and multicast traffic are introduced, SCI needs to be transmitted through PSCCH in addition to PSCCH. The SCI transmitted over the PSCCH is referred to as a primary SCI and the SCI transmitted over the PSCCH is referred to as a secondary SCI.

In NR V2X, the terminal device transmits information through a resource in a SL resource pool configured by the network device or a preconfigured SL resource pool. The resource pool is a set of time-frequency resources used by the terminal device in SL to transmit information. The configuration of the resource pool has the granularity of time slot in the time domain, and only supports continuous PRBs in the frequency domain. For a given end device, a (pre-) configured pool of resources may be used for unicast transmissions, multicast transmissions and broadcast transmissions. The load of the first-level SCI in the two-level SCI of unicast transmission, multicast transmission and broadcast transmission of each resource pool is the same. Each resource pool is configured with only one PSCCH format for the first level SCI. The number of time domain symbols of the PSCCH per resource pool is (pre-) configured. The size (size) of the subchannels of each resource pool may be 10 PRBs, 15 PRBs, 20 PRBs, 25 PRBs, 50 PRBs, 75 PRBs or 100 PRBs, being (pre-) configured. The scrambling procedure of the second level SCI is independent of the scrambling procedure of the psch. When the second-level SCI carries out RE mapping in the PSSCH, the frequency domain is mapped firstly and then the time domain is mapped, and the RE of the second-level SCI and the RE of the data on the PSSCH are not mutually interwoven. When RE mapping is performed on the second-level SCI, Frequency Division Multiplexing (FDM) may be performed with the DMRS of the PSSCH within the same symbol. The modulation scheme used by the second-stage SCI may be Quadrature Phase Shift Keying (QPSK), or may be other modulation schemes, which is not limited herein.

For understanding the resources in the resource pool in NR V2X, the air interface resources will be described first. The air interface resource comprises a time domain resource and a frequency domain resource, the time domain resource is divided according to a symbol (symbol), and the frequency domain resource is divided according to a subcarrier (subcarrier). REs are the smallest resource unit for data transmission, and 1 RE corresponds to 1 time domain symbol and 1 frequency domain subcarrier. A Transmission Time Interval (TTI) is a time domain granularity for carrying data information or service information. A TTI of 1 TTI may correspond to a slot, and a TTI including S time domain symbols may be referred to as a slot (slot) or a full slot (slot). One TTI is also called a Transmission Opportunity (TO), for example, one data packet may be carried on a time-frequency resource composed of one TTI in the time domain and at least one PRB in the frequency domain. A Resource Block (RB) is a basic unit for resource scheduling, and 1 RB corresponds to a plurality of subcarriers in 1 TTI, that is, 1 RB corresponds to a plurality of subcarriers consecutive in the frequency domain. Referring to fig. 3, fig. 3 is a schematic diagram of an air interface resource according to an embodiment of the present invention. As shown in fig. 3, the horizontal axis is time (time), the vertical axis is frequency (Freq), 1 grid represents 1 RE, 1 TTI is composed of n time domain symbols, 1 RB is composed of P subcarriers in 1 TTI, and n and P are positive integers. The time domain symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a single carrier frequency division multiple access (SC-FDMA) symbol. For example, P ═ 12.

In NR Uu, when UCI and UL-SCH are carried on PUSCH, the terminal device may map the coded UCI to PUSCH after multiplexing with UL-SCH in a rate matching manner, or may map the coded UCI to PUSCH in a manner that puncturing (puncturing) has been mapped to UL-SCH on PUSCH, thereby implementing multiplexing with UL-SCH. UL-SCH is data. Before rate matching, the number of physical resources occupied by UCI, that is, the number of REs occupied by UCI, that is, the number of modulation symbols after UCI coding, needs to be determined. In the case that the UCI is a hybrid automatic repeat request (HARQ) -Acknowledgement (ACK), a calculation formula of the amount of physical resources occupied by the UCI may be represented as formula (1):

wherein, Q' _ACK The amount of physical resources occupied by UCI. O is _ACK Is the number of bits of the HARQ-ACK (i.e. the payload size of the HARQ-ACK). At O _ACK L is greater than or equal to (or greater than) 360 _ACK Is 11 at O _ACK Less than (or less than or equal to) 360, L _ACK The number of bits of the CRC of the HARQ-ACK.

For the parameter, it can be considered that the ratio of the code rate of other information (e.g. UL-SCH) on the PUSCH to the code rate of UCI, which is notified by the network device, is a number greater than 0.

The Transport Block Size (TBS) corresponding to the UL-SCH on the PUSCH, i.e., the number of bits of data. C _UL-SCH -1 is the number of code blocks included in the UL-SCH on PUSCH. Scheduling PUSCH transmissionsThe Downlink Control Information (DCI) includes a Code Block Group Transmission Indication (CBGTI) field for indicating that the terminal device does not transmit the r-th code block _r To 0, in case DCI scheduling PUSCH transmission does not include one CBGTI field for indicating UE not to transmit the r-th code block, K _r Is the bit number of the r code block in the UL-SCH on the PUSCH.

For the amount of physical resources on PUSCH that can be used to carry UCI,

for the number of physical resources (i.e. the number of REs) that can be used to carry UCI on the l-th time domain symbol on PUSCH,

is the total number of time domain symbols on the PUSCH (including the number of time domain symbols carrying the DMRS). In case l is a time domain symbol carrying DMRS,

in case l is a time domain symbol not carrying DMRS,

the number of total physical resources (i.e. the number of subcarriers) included on symbol l for PUSCH,

the amount of physical resources occupied by the phase noise reference signal (PTRS) of the PUSCH on symbol l. A is capital forA source scaling factor. l ₀ Is the first time domain symbol which does not carry DMRS after the first DMRS symbol on the PUSCH.

Indicating rounding up.

Accordingly, in NR V2X, the calculation formula of the amount of physical resource occupied by the second-level SCI when the second-level SCI is transmitted in the PSSCH with SL-SCH can be expressed as formula (2):

wherein, Q' _SCI2 The amount of physical resources occupied by the second level SCI. O is _SCI2 Is the number of bits of the second-level SCI (i.e., the payload size of the second-level SCI). L is _SCI2 Is the number of bits of the CRC of the second level SCI.

Is indicated in the corresponding first-level SCI as a parameter. C _SL-SCH The number of code blocks included in the SL-SCH on the PSSCH.

For the number of physical resources (i.e. the number of REs) available to carry the second-level SCI on the l-th time-domain symbol on the psch,

is the total number of time domain symbols on the psch (excluding the number of symbols carrying Automatic Gain Control (AGC)). In the case where/is the time domain symbol carrying the AGC,

in the case where/is a time domain symbol that does not carry AGC,

the number of total physical resources (i.e., the number of subcarriers) included on symbol l for the psch.

The number of physical resources (i.e., the number of subcarriers) occupied by the DMRS on symbol l for the psch.

The amount of physical resources occupied by PTRS on symbol l for PSSCH.

The number of physical resources (i.e., the number of subcarriers) occupied by the SCI-Reference Signal (RS) on symbol l for the psch. γ is the number of REs, which is the difference between the number of REs included in an RB and the number of REs of the last encoded symbol of the second-level SCI in this RB.

In NR Uu, HARQ transmission in PUSCH is not necessarily a behavior, i.e. HARQ is not carried in every transmission PUSCH. When the HARQ performs RE mapping on the PUSCH, the formula for calculating the number of modulation symbols after encoding is adjusted based on data indicated by a Modulation and Coding Scheme (MCS). The code rate of HARQ is lower than that of data. In NR V2X, the mapping of the second level SCI in the psch is a corollary action, i.e., each psch transmission carries the second level SCI. Currently, the number of REs of the second-level SCI is determined based on data. However, since the correlation degree between the data and the second-level SCI is small, the number of REs of the second-level SCI determined according to the code rate of the data is large, and the code rate of the pscch is increased, so that the reliability of information transmission is reduced.

In order to better understand a communication method and apparatus disclosed in the embodiments of the present invention, a network architecture used in the embodiments of the present invention is described below. Referring to fig. 4, fig. 4 is a schematic diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 4, the network architecture may include a plurality of terminal devices (3 are illustrated in fig. 1), one of the terminal devices may communicate with only another terminal device, that is, unicast service, one of the terminal devices may also communicate with a plurality of terminal devices at the same time, that is, multicast service, and one of the terminal devices may also communicate with all terminal devices at the same time, that is, broadcast service. For example, the terminal device 1 may communicate with only the terminal device 2, or may communicate with both the terminal device 2 and the terminal device 3.

The terminal device can be a UE, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, a vehicle, or a user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved PLMN network, etc.

Referring to fig. 5, fig. 5 is a schematic flowchart of a communication method according to an embodiment of the present invention based on the network architecture shown in fig. 4. In this embodiment, the function executed by the first terminal device in the present invention may also be executed by a module (e.g., a chip) in the first terminal device, and the function executed by the second terminal device in the present invention may also be executed by a module (e.g., a chip) in the second terminal device. As shown in fig. 5, the communication method may include the following steps.

501. And the first terminal equipment determines the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool.

When the first terminal device needs to send information, the configuration parameters of the resource pool used by the first terminal device may be obtained first. The configuration parameters of the resource pool may include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time-domain symbols of the PSCCH. And then the first terminal equipment determines the number of the modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool.

When the first terminal device determines the number of the modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool, the code rate of the first-level SCI can be determined according to the configuration parameters of the resource pool, and then the number of the modulation symbols after the second-level SCI coding can be determined according to the code rate of the first-level SCI.

When determining the code rate of the first-level SCI according to the configuration parameters of the resource pool, the first terminal device may determine the code rate of the first-level SCI according to the format of the PSCCH corresponding to the resource pool, the CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time domain symbols of the PSCCH. Specifically, the bit number of the first-level SCI may be determined according to the format of the PSCCH corresponding to the resource pool, the bit number after the first-level SCI is encoded may be determined according to the number of candidate PRBs of the PSCCH supported by the resource pool and the number of time-domain symbols of the PSCCH, and then the code rate of the first-level SCI may be determined according to the bit number of the first-level SCI, the bit number of the CRC of the first-level SCI, and the bit number after the first-level SCI is encoded. When the first terminal device determines the number of bits after the first-level SCI coding according to the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, the first terminal device may first determine the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, and then determine the number of bits after the first-level SCI coding according to the number of modulation symbols after the first-level SCI coding and the modulation order of the first-level SCI.

For example, the code rate of the first-level SCI may be calculated as formula (3):

wherein, CR _SCI1 Code rate, O, representing first level SCI _SCI1 Number of bits, L, representing first level SCI _SCI1 Number of bits, Q ', representing CRC of the first-stage SCI' _SCI1 Indicating the number of modulation symbols after the first-level SCI coding,

representing the modulation order of the first-level SCI,

representing the number of bits after the first level SCI encoding. Q' _SCI1 The calculation formula (2) can be as in formula (4):

Q′ _SCI1 ＝12*O _PRB *O _symbol (4)

wherein, O _PRB Indicates the number of candidate PRBs of the PSCCH supported by the resource pool, O _symbol Indicating the number of time domain symbols of the PSCCH. 12 is the number of subcarriers in one RB.

The code rate of the first-stage SCI may be various modifications of the above equation (3), and the number of modulation symbols after the first-stage SCI is encoded may be various modifications of the above equation (4), which is not limited herein.

When the first terminal device determines the number of modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI, the number of modulation symbols after the second-level SCI encoding can be determined according to the code rate of the first-level SCI, the number of bits of the second-level SCI, and the number of bits of the CRC of the second-level SCI. Specifically, the first terminal device may first determine the code rate of the first-level SCI as the code rate of the second-level SCI, that is, the code rate of the second-level SCI is considered to be equal to the code rate of the first-level SCI. And then the first terminal equipment can determine the number of modulation symbols after the second-level SCI coding according to the bit number of the second-level SCI of the code rate of the second-level SCI and the bit number of the CRC of the second-level SCI. The calculation formula of the number of modulation symbols after the second-level SCI coding can be as in formula (5):

wherein, Q' _SCI2 Indicates the number of modulation symbols, CR, after second-level SCI encoding _SCI1 Code rate, O, representing first level SCI _SCI2 Number of bits, L, representing second level SCI _SCI2 The number of bits representing the CRC of the second level SCI,

representing the modulation order of the first-level SCI,

representing the number of bits after second level SCI encoding. The formula for calculating the number of modulation symbols after second-level SCI coding may also be as in formula (6):

wherein γ represents the number of REs, and is a difference between the number of REs included in one RB and the number of REs of the last coded symbol of the second-level SCI in this RB. Since the granularity of mapping the second-level SCI in the frequency domain is RB, gamma can guarantee Q' _SCI2 Is an integer multiple of RB.

When the first terminal device determines the number of modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI, the first terminal device may also determine the number of modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI, and the first parameter. The formula for calculating the number of modulation symbols after the second-level SCI coding may also be as in formula (7):

wherein the content of the first and second substances,

representing a first parameter. When the first terminal equipment determines the number of the modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI, the first terminal equipment can pass through

The number of modulation symbols after the second-level SCI coding is adjusted. Since the configurations of the DMRSs of the first-level SCI and the second-level SCI are different, the first-level SCI uses an PSCCH DMRS configuration, and the second-level SCI uses a PSSCH DMRS configuration, using

Adjusting Q' _SCI2 The method can be used for adjusting the decoding performance difference caused by DMRS difference and increasing the scheduling flexibility of the terminal equipment. The first terminal device may increase assuming that the configuration of the DMRS results in the DMRS performance of the first level SCI being better than the DMRS performance of the second level SCI

Value to properly reduce the code rate of the second-level SCI. That is, the modulation may be adjusted according to a time domain format (pattern) configured by the DMRS

A value of, e.g.

May be {1,1.25,1.4,1.6 }. The first parameter may be determined according to the following manner of determining the second parameter, and the detailed description may refer to step 601, which is not repeated herein.

The formula for calculating the number of modulation symbols after the second-level SCI coding may also be as in formula (8):

the calculation formula of the number of modulation symbols after the second-level SCI coding can also be as in formula (9):

502. and the first terminal equipment determines the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI.

After the first terminal device determines the number of the modulation symbols coded by the second-level SCI according to the configuration parameters of the resource pool, the coded second-level SCI may be determined according to the number of the modulation symbols coded by the second-level SCI. Specifically, the bit number of the second-level SCI after encoding may be determined according to the number of modulation symbols of the second-level SCI after encoding, and then the encoded second-level SCI may be determined according to the bit number of the second-level SCI after encoding. The first terminal device determines the detailed description of the number of bits after the second-level SCI coding according to the number of modulation symbols after the second-level SCI coding, which may refer to the description of determining the number of bits after the first-level SCI coding according to the number of modulation symbols after the first-level SCI coding, and is not described herein again.

503. The first terminal device transmits first information including the encoded second-level SCI to the second terminal device over the psch.

Accordingly, the second terminal device receives first information including the encoded second-level SCI from the first terminal device over the psch.

In a case that the number of modulation symbols after the second-level SCI is encoded is determined according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI, and the first parameter, the first information may further include indication information for indicating a value of the first parameter, and details may refer to a description about the value of the second parameter in the embodiment corresponding to fig. 6, which is not described herein again.

504. And the second terminal equipment determines the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool.

After the second terminal device receives the first information including the encoded second-level SCI from the first terminal device through the psch, the number of modulation symbols encoded by the second-level SCI may be determined according to the configuration parameters of the resource pool. The configuration parameters of the resource pool may include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time domain symbols of the PSCCH. When the second terminal device determines the number of modulation symbols after the second-level SCI is encoded according to the configuration parameters of the resource pool, the code rate of the first-level SCI may be determined according to the format of the PSCCH corresponding to the resource pool, the CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time domain symbols of the PSCCH, and then the number of modulation symbols after the second-level SCI is encoded according to the code rate of the first-level SCI.

When the second terminal device determines the code rate of the first-level SCI according to the format of the PSCCH corresponding to the resource pool, the CRC of the first-level SCI, the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, the bit number of the first-level SCI can be determined according to the format of the PSCCH corresponding to the resource pool, the bit number of the first-level SCI after being encoded is determined according to the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, and the code rate of the first-level SCI is determined according to the bit number of the first-level SCI, the bit number of the CRC of the first-level SCI and the bit number of the first-level SCI after being encoded. When the number of bits after the first-level SCI coding is determined according to the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, the number of modulation symbols after the first-level SCI coding can be determined according to the number of the candidate PRBs of the PSCCH supported by the resource pool and the number of the time domain symbols of the PSCCH, and the number of bits after the first-level SCI coding can be determined according to the number of the modulation symbols after the first-level SCI coding and the modulation order of the first-level SCI. The detailed description may refer to the related description in step 501, and is not repeated herein.

When the second terminal device determines the number of modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI, the number of modulation symbols after the second-level SCI encoding may be determined according to the code rate of the first-level SCI, the number of bits of the second-level SCI, and the number of bits of the CRC of the second-level SCI. The number of modulation symbols after the second-level SCI coding can also be determined according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and the first parameter. The detailed description may refer to the related description in step 501, and is not repeated herein.

505. And the second terminal equipment decodes the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.

After the second terminal device determines the number of the modulation symbols coded by the second-level SCI according to the configuration parameters of the resource pool, the second terminal device may decode the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI. When the second terminal device decodes the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI to obtain the second-level SCI, the number of bits encoded by the second-level SCI may be determined according to the number of modulation symbols encoded by the second-level SCI, and then the encoded second-level SCI is decoded according to the number of bits encoded by the second-level SCI to obtain the second-level SCI. The detailed description may refer to step 502, which is not repeated herein.

Optionally, after step 502 and before step 503, the method may further include: the first terminal equipment maps the first information to transmission resources of PSSCH according to a first rule, and the coded second-level SCI is mapped from a first PSSCH symbol carrying corresponding DMRS when mapping in time domain. The first rule may be that the first psch symbol carrying the respective DMRS is the first DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, and the second DMRS symbol carrying the respective DMRS is the second DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSSCH is not equal to the number of candidate PRBs for the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first threshold may be 2, or may be other values, which are not limited herein. The first rule may also be that the bandwidth of the pscch carrying the DMRS is not less than a third threshold number of PRBs, where the third threshold may be 4, or may be another value, which is not limited herein.

The first rule may also be that, assuming that the first PSSCH symbol carrying the corresponding DMRS is an end symbol of the PSSCH, the time domain mapping rule for mapping the second-level SCI is that, after the second-level SCI is mapped from the first PSSCH symbol carrying the corresponding DMRS, the second-level SCI performs mapping on the previous symbol of the first PSSCH symbol carrying the corresponding DMRS in a reverse direction from back to front.

Optionally, the first terminal device maps the first information to the transmission resource of the PSSCH according to a third rule, and the coded second-level SCI is mapped from the first PSSCH symbol in the time domain. The third rule may be that psch and PSCCH are FDM, and the bandwidth of the psch is below a sixth threshold. The sixth threshold may be 4, or may be another value, which is not limited herein.

Optionally, the first information may further include encoded first data, and after step 502 and before step 503, the method may further include: the first terminal device maps the first data starting from the first PSCCH symbol after the last symbol of the PSCCH if the second rule is satisfied. I.e. the part of the PSCCH that is FDM with the PSCCH is not used to carry the PSCCH, i.e. not used for resource mapping of the PSCCH. That is, the first data does not include psschhre with PSCCH FDM when performing rate matching, and only includes psschhre after the PSCCH end symbol.

The second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs.

As a possible implementation, the second rule may be that the subchannel size of the resource pool is smaller than a second threshold. The second threshold may be 20 PRBs, or may be other values, which are not limited herein.

The number of modulation symbols after the second-level SCI coding does not exceed a fifth threshold value.

Before sending a piece of information, a CRC (cyclic redundancy check) code needs to be added to the information, then channel coding and rate matching are carried out on the information, then scrambling is carried out on the information after channel coding and rate matching, then the information after scrambling is modulated, namely a bit block after scrambling is modulated to obtain a complex modulation symbol block, then layer mapping is carried out on the information after modulation, then precoding is carried out on the information after layer mapping, namely antenna port mapping is carried out on the information, then the complex modulation symbol block corresponding to each antenna port used for transmitting PSSCH is mapped to a virtual resource block, and then the virtual resource block is mapped to PRB. In the process of mapping the complex value modulation symbol block corresponding to each antenna port for transmitting the PSSCH to the virtual resource block, for each antenna port for transmitting the PSSCH, the complex value symbol block

Should be multiplied by an amplitude scaling factor

To meet a specified transmission power and then mapped to REs (k, l) configured for transmission of the virtual resource block _p,u Above, k-0 is the lowest numbered first subcarrier of the virtual resource block configured for transmission. The mapping complies with the following rules: mapping on a virtual resource block configured for transmission, and not being used for transmitting corresponding DMRS, PTRS, CSI-RS or P on REs of PRBs corresponding to the virtual resource blockThe SSCH. When complex-valued symbols (complex-valued symbols) corresponding to bits of the second-level SCI are mapped to the configured virtual resource block, the mapping is performed according to the frequency domain first and the time domain second, the mapping may be performed according to the ascending order with the index k first, and then the mapping starts with the index l from the first PSSCH symbol carrying the corresponding DMRS. The mapping is performed according to a first rule in the mapping process. When complex-valued symbols (complex-valued symbols) corresponding to the bits of the second-level SCI are mapped to the configured virtual resource block, that is, when data are mapped to the configured virtual resource block, the data can be mapped from the first PSCCH symbol after the last symbol of the PSCCH under the condition that the second rule is satisfied. In case the subchannel size of the resource pool is greater than or equal to (or greater than) the second threshold, PSSCH DMRS are mapped onto the same Orthogonal Frequency Division Multiplexing (OFDM) symbol as the PSCCH.

Optionally, before step 505, the method may further include: and the second terminal equipment de-maps the first information from the transmission resource of the PSSCH according to a first rule, and the decoded second-level SCI is de-mapped from the first PSSCH symbol carrying the corresponding DMRS when in time domain de-mapping. The first rule may be that the first psch symbol carrying the respective DMRS is the first DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, and the second DMRS symbol carrying the respective DMRS is the second DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the bandwidth of the psch carrying the DMRS is not less than a third threshold number of PRBs.

The first rule may also be that, assuming that the first PSSCH symbol carrying the corresponding DMRS is an end symbol of the PSSCH, the time domain mapping rule for mapping the second-level SCI is that, after the second-level SCI is mapped from the first PSSC symbol carrying the corresponding DMRS, the second-level SCI performs mapping on the previous symbol of the first PSSCH symbol carrying the corresponding DMRS in a reverse direction from back to front.

Optionally, the first terminal device maps the first information to the transmission resource of the PSSCH according to a third rule, and the coded second-level SCI is mapped from the first PSSCH symbol in the time domain. And/or bypassing the resources of the psch with the PSCCH FDM when rate matching the first data. The third rule may be that psch and PSCCH are FDM, and the bandwidth of the psch is below a sixth threshold. The sixth threshold may be 4, or may be another value, which is not limited herein.

Optionally, the first information may further include encoded first data, and before step 505, the method may further include: the first data after coding is demapped starting from the first PSCCH symbol after the last symbol of the PSCCH if the second rule is fulfilled. The second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs. The second rule may also be that the subchannel size of the resource pool is smaller than a second threshold.

The detailed description may refer to the above description.

Referring to fig. 6 based on the network architecture shown in fig. 4, fig. 6 is a flowchart illustrating another communication method according to an embodiment of the present invention. In this embodiment, the function executed by the first terminal device in the present invention may also be executed by a module (e.g., a chip) in the first terminal device, and the function executed by the second terminal device in the present invention may also be executed by a module (e.g., a chip) in the second terminal device. As shown in fig. 6, the communication method may include the following steps.

601. And the first terminal equipment acquires the value of the second parameter according to the information of the first data.

When the first terminal device needs to send the first data, the value of the second parameter may be obtained according to the information of the first data. The information of the first data may include a modulation order of the first data and a code rate of the first data. The first data is data to be transmitted.

The resource pool of each SL configures at least one MCS table, i.e., one or more MCS tables. For example, the MCS table may be as shown in table 1:

table 1MCS table

A second parameter table may be determined in advance for each MCS table in each resource pool, and a value of the second parameter may be determined according to a configuration parameter of the resource pool, a bit number of the second SCI, and a bit number of the CRC of the second-level SCI. The configuration may be configured to the terminal device after the network device determines, or may be determined by the terminal device. Wherein the second level SCI at which the value of the second parameter is determined is different from the second level SCI described elsewhere herein. Specifically, the number of modulation symbols after the second-level SCI coding may be determined according to the configuration parameter of the resource pool, and then the value of the second parameter may be determined according to the number of modulation symbols after the second-level SCI coding, the bit number of the second SCI, and the bit number of the CRC of the second-level SCI. According to the definition of the code rate, the calculation formula of the code rate of the data can be as formula (10):

wherein, CR _data Code rate, Q, representing data _mdata Representing the modulation order of the data. Substituting equation (10) into equation (2) yields equation (11):

wherein, Q' _SCI2 Indicates the number of modulation symbols after second-level SCI coding, O _SCI2 Number of bits, L, representing second SCI _SCI2 The number of bits representing the CRC of the second-level SCI,

representing the second parameter. It can be seen that in formula (9) except

Others are known parameters. For example, a table of the second parameter may be obtained according to the second column and the third column in table 1, and the table of the second parameter may be as shown in table 2:

TABLE 2 Table of second parameters

When the first terminal device obtains the value of the second parameter according to the information of the first data, the first terminal device may first obtain the value of the index corresponding to the modulation order and the code rate of the first data from table 1, and then obtain the value of the second parameter corresponding to the value of the index from table 2.

602. And the first terminal equipment determines the number of modulation symbols after the second-level SCI coding according to the value of the second parameter.

After the first terminal device obtains the value of the second parameter according to the information of the first data, the number of modulation symbols after the second-level SCI coding can be determined according to the value of the second parameter. When the first terminal device determines the number of modulation symbols after the second-level SCI coding according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding may be determined according to the number of bits of the first data, the number of bits of the second-level SCI, the number of REs available for carrying the second-level SCI on the psch, and the value of the second parameter. The number of modulation symbols after the second level SCI coding can be calculated according to equation (2). The calculation formula for determining the number of modulation symbols after second-level SCI coding may also be formula (8) or formula (9).

603. And the first terminal equipment determines the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI.

After the first terminal device determines the number of modulation symbols after the second-level SCI coding according to the second parameter, the first terminal device may determine the second-level SCI after coding according to the number of modulation symbols after the second-level SCI coding. Specifically, the bit number after the second-level SCI encoding may be determined according to the number of modulation symbols after the second-level SCI encoding, and then the encoded second-level SCI may be determined according to the bit number after the second-level SCI encoding.

604. The first terminal device transmits first information including the encoded first data, the encoded second-level SCI, and indication information indicating a value of the second parameter to the terminal device through the psch.

After determining the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI, the first terminal device may send, to the terminal device through the PSSCH, first information including the determined encoded first data, the determined encoded second-level SCI, and indication information indicating a second parameter. Accordingly, the second terminal device receives first information including the determined encoded first data, the determined encoded second-level SCI, and indication information indicating the second parameter from the first terminal device through the psch.

605. And the second terminal equipment acquires the value of the second parameter according to the indication information.

After the second terminal device receives the first information including the value of the first data after determining encoding, the second-level SCI after determining encoding, and the indication information for indicating the second parameter from the first terminal device through the PSSCH, the value of the second parameter may be acquired according to the indication information. The value of the second parameter is determined according to the configuration parameter of the resource pool, the bit number of the second SCI and the bit number of the CRC of the second-level SCI. The detailed description may refer to the related description in step 601, and is not repeated herein. The indication information may be a display indication, i.e. directly indicating the value of the second parameter, or an implicit indication. In a case where the indication information is an implicit indication, the indication information may indicate a value of an index to which a value of the second parameter corresponds. For example, the index has a value of 1 and the second parameter has a value of 1.13. It is also possible to divide the 32 values in the table of the second parameter into a plurality of candidate sets, e.g. 4, each candidate set corresponding to an index value. Correspondingly, the indication information may indicate a value of an index corresponding to the candidate set of values of the second parameter. The second terminal device may first determine a candidate set of values of the second parameter according to the indication information, and then select one value from the determined candidate set as the value of the second parameter. For example, the MCS table may be divided into 4 groups, i.e., MCS0-MCS7, MCS8-MCS15, MCS16-MCS23, and MCS24-MCS32, a candidate set of four second parameters worth of 4 second parameters is selected from each of the 4 groups, and indication information may be carried by 2 bits, and the indication information may indicate which of the four candidate sets the candidate set is. Or may be a fixed set of values 0-31, the 32 values are divided into 4 groups, i.e., {0,1,2,3,4,5,6,7}, {8,9,10,11,12,13,14,15}, {16,17,18,19,20,21,22,23}, {24,25,26,27,28,29,30,31}, and when the network configures 4 values of the second parameter, a value is taken from the 4 groups, such as 1,9,18, 30; or a value is taken in the first group, and 8,13 and 24 are respectively added on the basis of the value to complete the value taking. Such as 1,9,17, 25.

606. And the second terminal equipment determines the number of modulation symbols after the second-level SCI coding according to the value of the second parameter.

After the second terminal device obtains the value of the second parameter according to the indication information, the number of modulation symbols after the second-level SCI coding can be determined according to the value of the second parameter. When the second terminal device determines the number of modulation symbols after the second-level SCI coding according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding may be determined according to the number of bits of the first data, the number of bits of the second-level SCI, the number of REs available for carrying the second-level SCI on the psch, and the value of the second parameter. For a detailed description, reference may be made to step 602, which is not repeated herein.

607. And the second terminal equipment decodes the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.

After the second terminal device determines the number of the modulation symbols encoded by the second-level SCI according to the value of the second parameter, the encoded second-level SCI may be decoded according to the number of the modulation symbols encoded by the second-level SCI to obtain the second-level SCI. Specifically, the bit number of the second-level SCI after encoding may be determined according to the number of modulation symbols of the second-level SCI after encoding, and then the second-level SCI may be obtained by decoding the encoded second-level SCI according to the bit number of the second-level SCI after encoding.

Optionally, before step 604, the method may further include: the first terminal equipment maps the first information to transmission resources of PSSCH according to a first rule, and the coded second-level SCI is mapped from a first PSSCH symbol carrying corresponding DMRS when mapping in time domain. The first rule may be that the first psch symbol carrying the respective DMRS is the first DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, and the second DMRS symbol carrying the respective DMRS is the second DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the bandwidth of the pscch carrying the DMRS is not less than a third threshold number of PRBs, where the third threshold may be 4, or may be another value, which is not limited herein.

Optionally, the first terminal device maps the first information to the transmission resource of the psch according to a third rule, and the coded second-level SCI is mapped from the first psch symbol in the time domain. The third rule may be that PSCCH and PSCCH are FDM, and that the bandwidth of the PSCCH is below a sixth threshold. The sixth threshold may be 4, or may be another value, which is not limited herein.

The second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs. The fourth threshold may be 4 PRBs, or may be other values, which is not limited herein.

Optionally, before step 604, the method may further include: the first terminal device maps the encoded first data starting with the first PSCCH symbol after the last symbol of the PSCCH if the second rule is satisfied.

Optionally, before step 605, the method may further include: and the second terminal equipment demaps the first information from the PSSCH according to a first rule, and the coded second-level SCI is demapped from the first PSSCH symbol carrying the corresponding DMRS when in time domain demapping. The first rule may be that the first psch symbol carrying the respective DMRS is the first DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is greater than the number of candidate PRBs of the PSCCH supported by the resource pool, and the second DMRS symbol carrying the respective DMRS is the second DMRS symbol determined according to the PSSCH DMRS table in case the scheduling bandwidth of the psch is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSSCH is not equal to the number of candidate PRBs for the PSCCH supported by the resource pool. The first rule may also be that the scheduling bandwidth of the PSCCH is not less than the first threshold number of PRBs if the subchannel size of the resource pool is equal to the number of candidate PRBs of the PSCCH supported by the resource pool. The first rule may also be that the bandwidth of the psch carrying the DMRS is not less than a third threshold number of PRBs.

Optionally, the first terminal device maps the first information to the transmission resource of the psch according to a third rule, and the coded second-level SCI is mapped from the first psch symbol in the time domain. The third rule may be that psch and PSCCH are FDM, and the bandwidth of the psch is below a sixth threshold. The sixth threshold may be 4, or may be another value, which is not limited herein.

Optionally, the first information may further include first data, and before step 605, the method may further include: the second terminal device de-maps the encoded first data starting from the first PSCCH symbol after the last symbol of the PSCCH if the second rule is satisfied. The second rule may be that the PSCCH and PSCCH are Frequency Division Multiplexed (FDM), and/or that the bandwidth of the PSCCH is less than a fourth threshold number of PRBs. The second rule may also be that the subchannel size of the resource pool is smaller than a second threshold.

The detailed description may refer to the above related description, and will not be repeated herein.

Referring to fig. 13 based on the network architecture shown in fig. 4, fig. 13 is a flowchart illustrating another communication method according to an embodiment of the present invention. In this embodiment, the function executed by the first terminal device in the present invention may also be executed by a module (e.g., a chip) in the first terminal device, and the function executed by the second terminal device in the present invention may also be executed by a module (e.g., a chip) in the second terminal device. As shown in fig. 13, the communication method may include the following steps.

1301. The first terminal device maps the first information to the transmission resources of the PSSCH according to a first rule.

The first information includes a coded second-level SCI, which is mapped from a first psch symbol carrying a corresponding DMRS when mapped in a time domain. The detailed description of the first rule may refer to the above related description, and is not repeated herein. The first information further includes encoded first data.

1302. The first terminal device transmits the first information to the second terminal device through the PSSCH.

Accordingly, the second terminal device receives the first information from the first terminal device through the PSSCH.

1303. The second terminal device demaps the first information from the PSSCH in accordance with a first rule.

The encoded second-level SCI is demapped from the first psch symbol carrying the corresponding DMRS when demapping in the time domain.

For detailed descriptions of step 1301 to step 1303, reference may be made to the above description, which is not repeated herein.

Referring to fig. 14 based on the network architecture shown in fig. 4, fig. 14 is a flowchart illustrating another communication method according to an embodiment of the present invention. In this embodiment, the function executed by the first terminal device in the present invention may also be executed by a module (for example, a chip) in the first terminal device, and the function executed by the second terminal device in the present invention may also be executed by a module (for example, a chip) in the second terminal device. As shown in fig. 14, the communication method may include the following steps.

1401. The first terminal device maps the encoded first data starting with the first PSCCH symbol after the last symbol of the PSCCH if the second rule is satisfied.

1402. The first terminal equipment transmits the coded first data to the second terminal equipment through the PSSCH.

Accordingly, the second terminal device receives the encoded first data from the first terminal device through the PSSCH.

1403. The second terminal device de-maps the encoded first data starting from the first PSCCH symbol after the last symbol of the PSCCH, if the second rule is satisfied.

The detailed descriptions of step 1401-step 1403 can refer to the above related descriptions, and are not repeated herein.

The contents of the above several embodiments can be referred to each other, and the contents of each embodiment are not limited to the embodiment, and can also be applied to the corresponding contents in other embodiments.

Referring to fig. 7 based on the network architecture shown in fig. 4, fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present invention. As shown in fig. 7, the communication apparatus may include:

a first determining unit 701, configured to determine the number of modulation symbols after the second-level SCI coding according to the configuration parameter of the resource pool;

a second determining unit 702, configured to determine the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI;

a sending unit 703 is configured to send first information to the terminal device through the psch, where the first information includes the encoded second-level SCI.

In one embodiment, the configuration parameters of the resource pool include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, a number of candidate PRBs of the PSCCH supported by the resource pool, and a number of time domain symbols of the PSCCH;

the first determining unit 701 is specifically configured to:

In one embodiment, the determining, by the first determining unit 701, the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols includes:

determining the bit number of the first-level SCI according to the format;

In an embodiment, the determining, by the first determining unit 701, the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols includes:

In an embodiment, the determining, by the first determining unit 701, the number of modulation symbols after encoding by the second-level SCI according to the code rate of the first-level SCI includes:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and the first parameter.

In an embodiment, the second determining unit 702 is specifically configured to:

and determining the coded second-level SCI according to the bit number coded by the second-level SCI.

In one embodiment, the communication apparatus may further include:

a mapping unit 704, configured to map the first information to a transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is mapped from a first PSSCH symbol carrying a corresponding DMRS during time domain mapping.

In one embodiment, the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is larger than the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table; or

In an embodiment, the first information may further include encoded first data, and the mapping unit 704 is further configured to map the encoded first data from a first PSCCH symbol after a last symbol of the PSCCH if a subchannel size of the resource pool is smaller than a second threshold.

More detailed descriptions about the first determining unit 701, the second determining unit 702, the sending unit 703 and the mapping unit 704 may be directly obtained by referring to the description about the first terminal device in the embodiment of the method shown in fig. 5, which is not described herein again.

Referring to fig. 8, based on the network architecture shown in fig. 4, fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present invention. As shown in fig. 8, the communication apparatus may include:

a receiving unit 801, configured to receive first information from a terminal device through the psch, where the first information may include an encoded second-level SCI;

a determining unit 802, configured to determine, according to the configuration parameter of the resource pool, the number of modulation symbols after the second-level SCI coding;

a decoding unit 803, configured to decode the encoded second-level SCI according to the number of modulation symbols of the second-level SCI after encoding, to obtain the second-level SCI.

In one embodiment, the configuration parameters of the resource pool include a format of a PSCCH corresponding to the resource pool, a CRC of the first-level SCI, the number of candidate PRBs of the PSCCH supported by the resource pool, and the number of time-domain symbols of the PSCCH;

the determining unit 802 is specifically configured to:

In one embodiment, the determining unit 802 determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols includes:

determining the bit number of the first-level SCI according to the format;

In an embodiment, the determining unit 802 determines the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time-domain symbols includes:

In an embodiment, the determining unit 802 determines the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI, including:

In one embodiment, the decoding unit 803 is specifically configured to:

As a possible implementation, the communication apparatus may further include:

and a demapping unit 804, configured to demap the first information from the transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding DMRS during time domain demapping.

In one embodiment, the first rule is:

In an embodiment, the first information may further include encoded first data, and the demapping unit 804 is further configured to, in a case that a size of a sub-channel of the resource pool is smaller than a second threshold, start demapping the encoded first data from a first PSCCH symbol after a last symbol of the PSCCH.

More detailed descriptions about the receiving unit 801, the first determining unit 802, the decoding unit 803, and the demapping unit 804 may be directly obtained by referring to the description about the second terminal device in the embodiment of the method shown in fig. 5, which is not described herein again.

Referring to fig. 9 based on the network architecture shown in fig. 4, fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present invention. As shown in fig. 9, the communication apparatus may include:

an obtaining unit 901 configured to obtain a value of a second parameter according to information of the first data;

a first determining unit 902, configured to determine, according to a value of the second parameter, the number of modulation symbols after the second-level SCI coding;

a second determining unit 903, configured to determine the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI;

a sending unit 904, configured to send first information to the terminal device through the psch, where the first information includes the encoded first data, the encoded second-level SCI, and indication information indicating a value of the second parameter.

In an embodiment, the first determining unit 902 is specifically configured to determine the number of value modulation symbols after the second-level SCI coding according to the bit number of the first data, the bit number of the second-level SCI, the number of REs available on the psch for carrying the second-level SCI, and the second parameter.

In an embodiment, the second determining unit 903 is specifically configured to:

In one embodiment, the information of the first data may include a modulation order and a code rate of the first data.

In one embodiment, the communication apparatus may further include:

a mapping unit 905, configured to map the first information to a transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is mapped from a first PSSCH symbol that carries a corresponding DMRS during time domain mapping.

In one embodiment, the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is larger than the number of candidate PRBs of the PSCCH supported by the resource pool, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table; or

In an embodiment, the mapping unit 905 is further configured to map the encoded first data starting from a first PSCCH symbol after a last symbol of the PSCCH if a subchannel size of the resource pool is smaller than a second threshold.

In one embodiment, the value of the second parameter is determined according to the configuration parameter of the resource pool, the bit number of the second SCI, and the bit number of the CRC of the second-level SCI.

More detailed descriptions about the obtaining unit 901, the first determining unit 902, the second determining unit 903, the sending unit 904, and the mapping unit 905 may be directly obtained by referring to the description about the first terminal device in the method embodiment shown in fig. 6, which is not described herein again.

Referring to fig. 10 based on the network architecture shown in fig. 4, fig. 10 is a schematic structural diagram of another communication device disclosed in the embodiment of the present invention. As shown in fig. 10, the communication apparatus may include:

a receiving unit 1001, configured to receive first information from a terminal device through a psch, where the first information includes an encoded second-level SCI and indication information indicating a value of a second parameter;

an obtaining unit 1002, configured to obtain a value of the second parameter according to the indication information;

a determining unit 1003, configured to determine, according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding;

a decoding unit 1004, configured to decode the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI, so as to obtain the second-level SCI.

In an embodiment, the determining unit 1003 is specifically configured to determine the number of modulation symbols after the second-level SCI coding according to the bit number of the first data, the bit number of the second-level SCI, the number of REs that can be used to carry the second-level SCI on the psch, and the value of the second parameter.

In one embodiment, the decoding unit 1004 is specifically configured to:

and decoding the coded second-level SCI according to the coded bit number of the second-level SCI to obtain the second-level SCI.

In one embodiment, the communication apparatus may further include:

a demapping unit 1005, configured to demap, according to a first rule, the first information from the PSSCH, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding DMRS during time domain demapping.

In one embodiment, the first rule is:

In an embodiment, the first information may further include encoded first data, and the demapping unit 1005 is further configured to, in a case that a subchannel size of the resource pool is smaller than a second threshold, demapp the encoded first data starting from a first PSCCH symbol after a last symbol of the PSCCH.

More detailed descriptions about the receiving unit 1001, the obtaining unit 1002, the determining unit 1003, the decoding unit 1004, and the demapping unit 1005 may be directly obtained by referring to the description about the second terminal device in the embodiment of the method shown in fig. 6, which is not described herein again.

Referring to fig. 11, based on the network architecture described in fig. 1, fig. 11 is a schematic structural diagram of another communication device according to an embodiment of the present invention. As shown in fig. 11, the communication device may include a processor 1101, a memory 1102, an input interface 1103, an output interface 1104, and a bus 1105. The processor 1101 may be a general purpose Central Processing Unit (CPU), a plurality of CPUs, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs in accordance with the present inventive arrangements. The Memory 1102 may be, but is not limited to, a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 1102 may be self-contained and may be coupled to the processor 1101 by a bus 1105. The memory 1102 may also be integrated with the processor 1101. Bus 1405 is used, among other things, to enable connections between these components.

In one embodiment, the communication apparatus may be a first terminal device or a module (e.g., a chip) of the first terminal device, when the computer program instructions stored in the memory 1102 are executed, the processor 1101 is configured to control the sending unit 703 to perform the operations performed in the above embodiments, the processor 1101 is further configured to perform the operations performed in the above embodiments of the first determining unit 701, the second determining unit 702 and the mapping unit 704, the input interface 1103 is configured to receive information from other communication apparatuses, and the output interface 1104 is configured to perform the operations performed by the sending unit 703 in the above embodiments. The first terminal device or the module in the first terminal device may also be configured to execute various methods executed by the first terminal device in the method embodiment shown in fig. 5, which is not described again.

In one embodiment, the communication apparatus may be a second terminal device or a module (e.g., a chip) of the second terminal device, when the computer program instructions stored in the memory 1102 are executed, the processor 1101 is configured to control the receiving unit 801 to perform the operations performed in the above embodiments, the processor 1101 is further configured to perform the operations performed in the above embodiments of the first determining unit 802, the decoding unit 803 and the demapping unit 804, the input interface 1103 is configured to perform the operations performed by the receiving unit 801 in the above embodiments, and the output interface 1104 is configured to send information to other communication apparatuses. The first terminal device or the module in the first terminal device may also be configured to execute various methods executed by the second terminal device in the method embodiment shown in fig. 5, which is not described again.

In one embodiment, the communication apparatus may be a first terminal device or a module (e.g., a chip) of the first terminal device, when computer program instructions stored in the memory 1102 are executed, the processor 1101 is configured to control the sending unit 904 to perform the operations performed in the above embodiments, the processor 1101 is further configured to perform the operations performed in the above embodiments of the obtaining unit 901, the first determining unit 902, the second determining unit 903, and the mapping unit 905, the input interface 1103 is configured to receive information from other communication apparatuses, and the output interface 1104 is configured to perform the operations performed by the sending unit 904 in the above embodiments. The first terminal device or the module in the first terminal device may also be configured to execute various methods executed by the first terminal device in the method embodiment shown in fig. 6, which is not described again.

In one embodiment, the communication apparatus may be a second terminal device or a module (e.g., a chip) of the second terminal device, when the computer program instructions stored in the memory 1102 are executed, the processor 1101 is configured to control the receiving unit 1001 to perform the operations performed in the above embodiments, the processor 1101 is further configured to perform the operations performed in the above embodiments, the obtaining unit 1002, the determining unit 1003, the decoding unit 1004 and the demapping unit 1005, the input interface 1103 is configured to perform the operations performed by the receiving unit 1001 in the above embodiments, and the output interface 1104 is configured to transmit information to other communication apparatuses. The first terminal device or the module in the first terminal device may also be configured to execute various methods executed by the second terminal device in the method embodiment shown in fig. 6, which is not described again.

Referring to fig. 12, based on the network architecture shown in fig. 1, fig. 12 is a schematic structural diagram of another communication device according to an embodiment of the present invention. As shown in fig. 12, the communication apparatus may include an input interface 1201, a logic circuit 1202, and an output interface 1203. The input interface 1201 and the output interface 1203 are connected via a logic circuit 1202. The input interface 1201 is used for receiving information from other communication devices, and the output interface 1203 is used for outputting, scheduling or transmitting information to other communication devices. The logic circuit 1202 is configured to perform operations other than the operations of the input interface 1201 and the output interface 1203, for example, to implement the functions implemented by the processor 1101 in the above-described embodiments. The communication device may be a first terminal device or a module in the first terminal device, or may be a second terminal device or a module in the second terminal device. The more detailed descriptions of the input interface 1201, the logic circuit 1202, and the output interface 1203 may be directly obtained by referring to the above description of the first terminal device or the module in the first terminal device and the related description of the second terminal device or the module in the second terminal device in the above method embodiment, which is not repeated herein.

The embodiment of the invention also discloses a computer readable storage medium, wherein the computer readable storage medium is stored with instructions, and the instructions are executed to execute the method in the embodiment of the method.

The embodiment of the invention also discloses a computer program product containing instructions, and the instructions are executed to execute the method in the embodiment of the method.

The embodiment of the present invention further discloses a communication system, which includes a first terminal device and a second terminal device, and specifically describes the communication method shown in fig. 5 and fig. 6.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims

A method of communication, comprising:

determining the number of modulation symbols after the second-level sidelink control information SCI is coded according to the configuration parameters of the resource pool;

determining the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI;

and sending first information to the terminal equipment through a physical layer side uplink shared channel PSSCH, wherein the first information comprises the coded second-level SCI.
The method according to claim 1, wherein the configuration parameters of the resource pool include a format of a physical layer side uplink control channel (PSCCH) corresponding to the resource pool, a Cyclic Redundancy Check (CRC) of the first-level SCI, a number of PRBs (physical resource blocks) of the PSCCH supported by the resource pool, and a number of time-domain symbols of the PSCCH;

the determining the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool comprises:

determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols;

and determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.
The method of claim 2, wherein the determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols comprises:

determining the bit number of the first-stage SCI according to the format;

determining the bit number of the coded first-level SCI according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the code rate of the first-level SCI according to the bit number of the first-level SCI, the CRC bit number of the first-level SCI and the coded bit number of the first-level SCI.
The method of claim 3, wherein the determining the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time-domain symbols comprises:

determining the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the bit number of the first-stage SCI after coding according to the number of the modulation symbols of the first-stage SCI after coding and the modulation order of the first-stage SCI.
The method according to any of claims 2-4, wherein said determining the number of modulation symbols after second-level SCI coding according to the code rate of the first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI and the bit number of the CRC of the second-level SCI.
The method according to any of claims 2-4, wherein said determining the number of modulation symbols after second-level SCI coding according to the code rate of the first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and the first parameter.
The method according to any of claims 1-6, wherein said determining the encoded second-level SCI according to the number of modulation symbols encoded by said second-level SCI comprises:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols after the second-level SCI codes;

and determining the coded second-level SCI according to the coded bit number of the second-level SCI.
The method according to any one of claims 2-7, further comprising:

and mapping the first information to the transmission resources of the PSSCH according to a first rule, wherein the coded second-level SCI is mapped from a first PSSCH symbol carrying a corresponding demodulation reference signal (DMRS) when mapping in a time domain.
The method of claim 8, wherein the first rule is:

in the event that the PSSCH has a scheduling bandwidth greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined according to the PSSCH DMRS table, and in the event that the PSSCH has a scheduling bandwidth equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined according to the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The method of claim 8 or 9, wherein the first information further comprises encoded first data, the method further comprising:

and when the size of the sub-channel of the resource pool is smaller than a second threshold value, mapping the coded first data from a first PSSCH symbol after a last symbol of the PSCCH.
A method of communication, comprising:

receiving first information from a terminal device through a physical layer sidelink shared channel PSSCH, wherein the first information comprises coded second-level sidelink control information SCI;

determining the number of modulation symbols after the second-level SCI coding according to configuration parameters of a resource pool;

and decoding the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.
The method of claim 11, wherein the configuration parameters of the resource pool include a format of a physical layer side uplink control channel (PSCCH) corresponding to the resource pool, a Cyclic Redundancy Check (CRC) of a first-level SCI, a number of PRBs (physical resource blocks) of the PSCCH supported by the resource pool, and a number of time-domain symbols of the PSCCH;

the determining the number of modulation symbols after the second-level SCI coding according to the configuration parameters of the resource pool comprises:

determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols;

and determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.
The method of claim 12, wherein the determining the code rate of the first level SCI according to the format, the CRC of the first level SCI, the number of candidate PRBs, and the number of time-domain symbols comprises:

determining the bit number of the first-stage SCI according to the format;

determining the bit number of the coded first-level SCI according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the code rate of the first-level SCI according to the bit number of the first-level SCI, the CRC bit number of the first-level SCI and the coded bit number of the first-level SCI.
The method of claim 13, wherein the determining the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time-domain symbols comprises:

determining the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the bit number of the first-stage SCI after coding according to the number of the modulation symbols of the first-stage SCI after coding and the modulation order of the first-stage SCI.
The method as claimed in any of claims 12-14, wherein the determining the number of the modulation symbols after the second-level SCI encoding according to the code rate of the first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI and the bit number of the CRC of the second-level SCI.
The method according to any of claims 12-14, wherein said determining the number of modulation symbols after encoding by said second-level SCI according to the code rate of said first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and a first parameter.
The method according to any of claims 11-16, wherein said decoding said encoded second-level SCI according to the number of modulation symbols encoded by said second-level SCI to obtain said second-level SCI comprises:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and decoding the coded second-level SCI according to the bit number of the coded second-level SCI to obtain the second-level SCI.
The method according to any one of claims 12-17, further comprising:

and demapping the first information from the transmission resource of the PSSCH according to a first rule, wherein the coded second-level SCI is demapped from a first PSSCH symbol carrying a corresponding demodulation reference signal (DMRS) during time domain demapping.
The method of claim 18, wherein the first rule is:

in the event that the PSSCH's scheduling bandwidth is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined from the PSSCH DMRS table, and in the event that the PSSCH's scheduling bandwidth is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined from the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or alternatively

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The method of claim 18 or 19, wherein the first information further comprises encoded first data, the method further comprising:

demapping the encoded first data starting from a first PSSCH symbol after a last symbol of the PSCCH, if a subchannel size of the resource pool is smaller than a second threshold.
A method of communication, comprising:

acquiring a value of a second parameter according to the information of the first data;

determining the number of modulation symbols after the second-level sidelink control information SCI is coded according to the value of the second parameter;

determining the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI;

and transmitting first information to the terminal equipment through a physical layer side uplink shared channel PSSCH, wherein the first information comprises the coded first data, the coded second-level SCI and indication information used for indicating the value of the second parameter.
The method of claim 21 wherein determining the number of second-level SCI-encoded modulation symbols based on the value of the second parameter comprises:

and determining the number of modulation symbols after the second-level SCI coding according to the bit number of the first data, the bit number of the second-level SCI, the number of Resource Elements (RE) which can be used for bearing the second-level SCI on the PSSCH and the value of the second parameter.
The method of claim 21 or 22 wherein the determining the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI comprises:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and determining the coded second-level SCI according to the coded bit number of the second-level SCI.
The method of any of claims 21-23, wherein the information of the first data comprises a modulation order and a code rate of the first data.
The method according to any one of claims 21-24, further comprising:

and mapping the first information to the transmission resources of the PSSCH according to a first rule, wherein the coded second-level SCI is mapped from a first PSSCH symbol carrying a corresponding demodulation reference signal (DMRS) when mapping in a time domain.
The method of claim 25, wherein the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is greater than the number of candidate Physical Resource Blocks (PRBs) of a physical layer side uplink control channel (PSCCH) supported by a resource pool, the first PSSCH symbol carrying the corresponding DMRS is a first DMRS symbol determined according to an PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is a second DMRS symbol determined according to a PSSCH DMRS table; or alternatively

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or alternatively

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The method of claim 25 or 26, further comprising:

and when the size of the sub-channel of the resource pool is smaller than a second threshold value, mapping the coded first data from a first PSSCH symbol after a last symbol of the PSCCH.
The method according to any of claims 26-27, wherein the value of the second parameter is determined according to the configuration parameter of the resource pool, the number of bits of the second SCI, the number of bits of the CRC of the second level SCI.
A method of communication, comprising:

receiving first information from a terminal device through a physical layer sidelink shared channel PSSCH, wherein the first information comprises coded second-level sidelink control information SCI and indication information used for indicating the value of a second parameter;

acquiring the value of the second parameter according to the indication information;

determining the number of modulation symbols after the second-level SCI coding according to the value of the second parameter;

and decoding the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.
The method of claim 29 wherein the determining the number of modulation symbols after the second-level SCI coding according to the value of the second parameter comprises:

and determining the number of modulation symbols after the second-level SCI coding according to the bit number of the first data, the bit number of the second-level SCI, the number of Resource Elements (RE) which can be used for bearing the second-level SCI on the PSSCH and the value of the second parameter.
The method of claim 29 or 30 wherein the decoding the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI to obtain the second-level SCI comprises:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and decoding the coded second-level SCI according to the bit number of the coded second-level SCI to obtain the second-level SCI.
The method according to any one of claims 29-31, further comprising:

and demapping the first information from the PSSCH according to a first rule, wherein the coded second-level SCI is demapped from a first PSSCH symbol carrying a corresponding demodulation reference signal (DMRS) during time domain demapping.
The method of claim 32, wherein the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is greater than the number of candidate Physical Resource Blocks (PRBs) of a physical layer side uplink control channel (PSCCH) supported by a resource pool, the first PSSCH symbol carrying the corresponding DMRS is a first DMRS symbol determined according to an PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is a second DMRS symbol determined according to a PSSCH DMRS table; or alternatively

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The method of claim 32 or 33, wherein the first information further comprises encoded first data, the method further comprising:

demapping the encoded first data starting from a first PSSCH symbol after a last symbol of the PSCCH, if a subchannel size of the resource pool is smaller than a second threshold.
The method of claim 33 or 34 wherein the value of the second parameter is determined according to the configuration parameter of the resource pool, the number of bits of the second SCI, and the number of bits of the CRC of the second-level SCI.
A communications apparatus, comprising:

the first determining unit is used for determining the number of modulation symbols after the second-level sidelink control information SCI is coded according to the configuration parameters of the resource pool;

a second determining unit, configured to determine the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI;

a sending unit, configured to send first information to a terminal device through a physical layer side uplink shared channel PSSCH, where the first information includes the encoded second-level SCI.
The apparatus of claim 36, wherein the configuration parameters of the resource pool comprise a format of a physical layer side uplink control channel (PSCCH) corresponding to the resource pool, a Cyclic Redundancy Check (CRC) of a first-level SCI, a number of PRBs (candidate physical resource blocks) of the PSCCH supported by the resource pool, and a number of time-domain symbols of the PSCCH;

the first determining unit is specifically configured to:

determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols;

and determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.
The apparatus of claim 37, wherein the first determining unit determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of candidate PRBs, and the number of time-domain symbols comprises:

determining the bit number of the first-stage SCI according to the format;

determining the bit number of the coded first-level SCI according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the code rate of the first-level SCI according to the bit number of the first-level SCI, the CRC bit number of the first-level SCI and the coded bit number of the first-level SCI.
The apparatus of claim 38, wherein the determining, by the first determining unit, the number of bits after the first-level SCI coding according to the number of candidate PRBs and the number of time-domain symbols comprises:

determining the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the bit number of the first-stage SCI after coding according to the number of the modulation symbols of the first-stage SCI after coding and the modulation order of the first-stage SCI.
The apparatus of any of claims 37-39, wherein the determining the number of modulation symbols after second-level SCI coding according to the code rate of the first-level SCI by the first determining unit comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI and the bit number of the CRC of the second-level SCI.
The apparatus of any of claims 37-39, wherein the determining the number of modulation symbols after second-level SCI coding according to the code rate of the first-level SCI by the first determining unit comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and a first parameter.
The apparatus according to any of claims 36-41, wherein the second determining unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and determining the coded second-level SCI according to the coded bit number of the second-level SCI.
The apparatus of any one of claims 37-42, further comprising:

and a mapping unit, configured to map the first information to a transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is mapped from a first PSSCH symbol that carries a corresponding demodulation reference signal DMRS during time domain mapping.
The apparatus of claim 43, wherein the first rule is:

in the event that the PSSCH's scheduling bandwidth is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined from the PSSCH DMRS table, and in the event that the PSSCH's scheduling bandwidth is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined from the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or alternatively

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The apparatus of claim 43 or 44, wherein the first information further comprises encoded first data, and wherein the mapping unit is further configured to map the encoded first data from a first PSSCH symbol after a last PSCCH symbol in case that a subchannel size of the resource pool is smaller than a second threshold.
A communications apparatus, comprising:

a receiving unit, configured to receive first information from a terminal device through a physical layer side uplink shared channel psch, where the first information includes encoded second level side uplink control information SCI;

a determining unit, configured to determine the number of modulation symbols after the second-level SCI coding according to configuration parameters of a resource pool;

and the decoding unit is used for decoding the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.
The apparatus of claim 46, wherein the configuration parameters of the resource pool comprise a format of a physical layer side physical link control channel (PSCCH) corresponding to the resource pool, a Cyclic Redundancy Check (CRC) of a first-level SCI, a number of PRBs (candidate physical resource blocks) of the PSCCH supported by the resource pool, and a number of time-domain symbols of the PSCCH;

the determining unit is specifically configured to:

determining the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs and the number of the time domain symbols;

and determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI.
The apparatus of claim 47, wherein the determining unit determines the code rate of the first-level SCI according to the format, the CRC of the first-level SCI, the number of the candidate PRBs, and the number of time-domain symbols comprises:

determining the bit number of the first-stage SCI according to the format;

determining the bit number of the coded first-level SCI according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the code rate of the first-level SCI according to the bit number of the first-level SCI, the CRC bit number of the first-level SCI and the coded bit number of the first-level SCI.
The apparatus of claim 48, wherein the determining unit determines the number of bits after the first-level SCI coding according to the number of the candidate PRBs and the number of the time-domain symbols comprises:

determining the number of modulation symbols after the first-level SCI coding according to the number of the candidate PRBs and the number of the time domain symbols;

and determining the bit number of the first-stage SCI after coding according to the number of the modulation symbols of the first-stage SCI after coding and the modulation order of the first-stage SCI.
The apparatus of any of claims 47-49, wherein the determining unit for determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI and the bit number of the CRC of the second-level SCI.
The apparatus of any of claims 47-49, wherein the determining unit for determining the number of modulation symbols after the second-level SCI coding according to the code rate of the first-level SCI comprises:

and determining the number of modulation symbols after the second-level SCI is coded according to the code rate of the first-level SCI, the bit number of the second-level SCI, the bit number of the CRC of the second-level SCI and a first parameter.
The apparatus according to any of claims 46-51, wherein the decoding unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols after the second-level SCI codes;

and decoding the decoded second-level SCI according to the bit number of the second-level SCI after encoding to obtain the second-level SCI.
The apparatus of any one of claims 47-52, further comprising:

and a demapping unit, configured to demap the first information from the transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding demodulation reference signal DMRS when performing time domain demapping.
The apparatus of claim 53, wherein the first rule is:

in the event that the PSSCH's scheduling bandwidth is greater than the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the first DMRS symbol determined from the PSSCH DMRS table, and in the event that the PSSCH's scheduling bandwidth is equal to the number of candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is the second DMRS symbol determined from the PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The apparatus of claim 53 or 54, wherein the first information further comprises encoded first data, and wherein the demapping unit is further configured to, in case a subchannel size of the resource pool is smaller than a second threshold, demapp the encoded first data starting from a first PSSCH symbol after a last symbol of the PSCCH.
A communications apparatus, comprising:

an acquisition unit configured to acquire a value of a second parameter from information of the first data;

a first determining unit, configured to determine, according to the value of the second parameter, the number of modulation symbols after second-level sidelink control information SCI is encoded;

a second determining unit, configured to determine the encoded second-level SCI according to the number of modulation symbols encoded by the second-level SCI;

a sending unit, configured to send first information to a terminal device through a physical layer side uplink shared channel psch, where the first information includes encoded first data, the encoded second-level SCI, and indication information indicating a value of the second parameter.
The apparatus of claim 56, wherein the first determining unit is specifically configured to determine the number of modulation symbols after the second-level SCI coding according to the number of bits of the first data, the number of bits of the second-level SCI, the number of Resource Elements (REs) available on the PSSCH for carrying the second-level SCI, and the value of the second parameter.
The apparatus according to claim 56 or 57, wherein the second determining unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and determining the coded second-level SCI according to the coded bit number of the second-level SCI.
The apparatus of any of claims 56-58, wherein the information for the first data comprises a modulation order and a code rate for the first data.
The apparatus of any one of claims 56-59, further comprising:

and a mapping unit, configured to map the first information to the transmission resource of the PSSCH according to a first rule, where the coded second-level SCI is mapped from a first PSSCH symbol that carries a corresponding demodulation reference signal DMRS during time domain mapping.
The apparatus of claim 60, wherein the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is larger than the number of candidate Physical Resource Blocks (PRBs) of a physical layer side uplink control channel (PSCCH) supported by a resource pool, the first PSSCH symbol carrying the corresponding DMRS is a first DMRS symbol determined according to an PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is a second DMRS symbol determined according to a PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The apparatus of claim 60 or 61, wherein the mapping unit is further configured to map the coded first data starting from a first PSSCH symbol after a last PSCCH symbol if a subchannel size of the resource pool is smaller than a second threshold.
The apparatus of any of claims 56-62, wherein the value of the second parameter is determined according to a configuration parameter of the resource pool, a number of bits of the second SCI, and a number of bits of the CRC of the second-level SCI.
A communications apparatus, comprising:

a receiving unit, configured to receive first information from a terminal device through a physical layer side uplink shared channel psch, where the first information includes encoded second level side uplink control information SCI and indication information indicating a value of a second parameter;

an obtaining unit, configured to obtain a value of the second parameter according to the indication information;

a determining unit, configured to determine, according to the value of the second parameter, the number of modulation symbols after the second-level SCI coding;

and the decoding unit is used for decoding the coded second-level SCI according to the number of the modulation symbols coded by the second-level SCI to obtain the second-level SCI.
The apparatus of claim 64, wherein the determining unit is specifically configured to determine the number of modulation symbols after the second-level SCI coding according to the number of bits of the first data, the number of bits of the second-level SCI, the number of Resource Elements (REs) available on the PSSCH for carrying the second-level SCI, and the value of the second parameter.
The apparatus according to claim 64 or 65, wherein the decoding unit is specifically configured to:

determining the bit number of the second-level SCI after coding according to the number of the modulation symbols of the second-level SCI after coding;

and decoding the coded second-level SCI according to the bit number of the coded second-level SCI to obtain the second-level SCI.
The apparatus of any one of claims 64-65, further comprising:

and a demapping unit, configured to demap the first information from the PSSCH according to a first rule, where the coded second-level SCI is demapped from a first PSSCH symbol that carries a corresponding demodulation reference signal DMRS when performing time domain demapping.
The apparatus according to claim 67, wherein the first rule is:

under the condition that the scheduling bandwidth of the PSSCH is larger than the number of candidate Physical Resource Blocks (PRBs) of a physical layer side uplink control channel (PSCCH) supported by a resource pool, the first PSSCH symbol carrying the corresponding DMRS is a first DMRS symbol determined according to an PSSCH DMRS table, and under the condition that the scheduling bandwidth of the PSSCH is equal to the number of the candidate PRBs, the first PSSCH symbol carrying the corresponding DMRS is a second DMRS symbol determined according to a PSSCH DMRS table; or

The scheduling bandwidth of the PSSCH is not equal to the number of the candidate PRBs; or alternatively

And under the condition that the size of the sub-channel of the resource pool is equal to the number of the candidate PRBs, the scheduling bandwidth of the PSSCH is not less than a first threshold number of PRBs.
The apparatus of claim 67 or 68, wherein the first information further comprises encoded first data, and wherein the demapping unit is further configured to, in case the size of the sub-channel of the resource pool is smaller than a second threshold, demapp the encoded first data starting from a first PSSCH symbol after a last PSCCH symbol.
The apparatus of claims 68-69, wherein the value of the second parameter is determined according to a configuration parameter of the resource pool, a number of bits of the second SCI, and a number of bits of the CRC of the second-level SCI.
A communication device comprising a processor, a memory, an input interface for receiving information from a communication device other than the communication device, and an output interface for outputting information to the communication device other than the communication device, the processor invoking a computer program stored in the memory to implement the method of any of claims 1-35.
A communication system, comprising:

the communication device of any one of claims 36-45 and the communication device of any one of claims 46-55; or

Communication device according to any of claims 56-63 and communication device according to any of claims 64-70.
A computer-readable storage medium, in which a computer program or computer instructions are stored which, when executed, implement the method of any one of claims 1-35.