CN116261844A

CN116261844A - Side-link communication method and device

Info

Publication number: CN116261844A
Application number: CN202080104581.7A
Authority: CN
Inventors: 郭文婷; 苏宏家; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2023-06-13
Also published as: WO2022027660A1

Abstract

The embodiment of the application provides a side-link communication method and device, which can be applied to systems such as the Internet of vehicles and V2X, V V. In the method, a terminal device determines a target time domain pattern set of a DMRS according to a first channel bandwidth of a PSSCH, and further, the terminal device determines a first time domain position of the DMRS according to the target time domain pattern set. The target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, that is, the terminal device may determine the first time domain position of the DMRS in at least two different time domain pattern sets according to the difference of the first channel bandwidths of the PSSCH. Therefore, in the side-link communication process, the flexible configuration of the DMRS is provided, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, so that the communication efficiency of the side-link is improved.

Description

Side-link communication method and device

Technical Field

The present disclosure relates to the field of side-link communications, and in particular, to a method and an apparatus for side-link communications.

Background

In the field of wireless communication, one terminal device may communicate with another terminal device through a relay of a network device, or may directly communicate with another terminal device without passing through the network device, and when one terminal device directly communicates with another terminal device without passing through the network device, a communication link between the two terminal devices may be referred to as a Sidelink (SL) or a through link.

During a New Radio (NR) sidelink communication, a sidelink physical layer control channel (physical sidelink control channel, PSCCH) and a sidelink physical layer shared channel (physical sidelink share channel, PSSCH) may occupy the same SL transmission unit. The receiving device in the SL system may determine a PSSCH demodulation reference signal (demodulation reference signal, DMRS) on the PSSCH of the SL transmission unit. The PSSCH DMRS may also be represented by DMRS, which is used to demodulate the data in the PSSCH.

However, how to determine the time domain location of DMRS in the SL communication process is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a side-link communication method and device, which can be applied to the Internet of vehicles, such as vehicle-to-anything (vehicle to everything, V2X) communication, workshop communication long-term evolution (LTE-V) technology, vehicle-to-vehicle (vehicle to vehicle, V2V) communication and the like, or can be applied to the fields of intelligent driving, intelligent network vehicle connection and the like. In the method, the terminal device may determine the first time domain position of the DMRS in different time domain pattern sets according to the difference of the first channel bandwidths of the PSSCH. Therefore, in the side-link communication process, the flexible configuration of the DMRS is provided, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, so that the side-link communication efficiency is improved.

A first aspect of the embodiments of the present application provides a method for side-link communication, where the method may be applied to a terminal device, or may also be applied to component execution (such as a processor, a chip, or a chip system) of the terminal device, and in the method, the terminal device determines a first channel bandwidth of a side-link physical layer shared channel PSSCH; then, the terminal equipment determines a target time domain pattern set of a demodulation reference signal (DMRS) according to the first channel bandwidth, wherein the DMRS is borne on the PSSCH, and the target time domain pattern set comprises a first time domain pattern set or a second time domain pattern set; further, the terminal device determines the first time domain position of the DMRS according to the target time domain pattern set.

Based on the above technical scheme, in the side uplink communication process, the terminal device determines a target time domain pattern set of the DMRS according to the first channel bandwidth of the PSSCH, and further, the terminal device determines the first time domain position of the DMRS according to the target time domain pattern set. The target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, and the first time domain pattern set is different from the second time domain pattern set, that is, the terminal device may determine the first time domain position of the DMRS in at least two different time domain pattern sets according to the difference of the first channel bandwidths of the PSSCH. Therefore, in the side-link communication process, the flexible configuration of the DMRS is provided, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, so that the communication efficiency of the side-link is improved.

The DMRS carried on the PSSCH may be represented by a DMRS, PSSCH DMRS, PSSCH-DMRS, or other means, and is not limited thereto.

In a possible implementation manner of the first aspect of the embodiments of the present application, determining the target time domain pattern set of the DMRS according to the first channel bandwidth includes:

determining that the target set of time domain patterns for the DMRS includes the first set of time domain patterns when the first channel bandwidth meets at least one of:

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is equal to a second channel bandwidth of a side-uplink physical layer control channel PSCCH; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is smaller than a configured or preconfigured first preset value; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.

Based on the above technical solution, the terminal device determines that the target time domain pattern set includes the first time domain pattern set according to an association relationship between the first channel bandwidth and the configured or preconfigured subchannel bandwidth, and/or according to at least one of the conditions satisfied by the association relationship between the first channel bandwidth and the second channel bandwidth of the PSCCH. Wherein, the configured or preconfigured sub-channel bandwidth and/or the second channel bandwidth carrying the PSCCH are used as the basis, and the target time domain pattern set is determined to comprise the first time domain pattern set by combining the first channel bandwidth of the PSSCH, so that a specific implementation manner of determining the target time domain pattern set by the terminal equipment is provided, the realizability of the scheme is improved, and the realization flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the first preset value includes bandwidths of 20 physical resource blocks PRB.

Based on the above technical solution, when the first channel bandwidth is a subchannel bandwidth and the subchannel bandwidth is smaller than a configured or preconfigured first preset value, the terminal device determines that the target time domain pattern set of the DMRS includes the first time domain pattern set. The first preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. A specific implementation mode of the first preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the second preset value is 3 PRBs.

Based on the above technical solution, when the difference between the first channel bandwidth and the second channel bandwidth is smaller than a configured or preconfigured second preset value, the terminal device determines that the target time domain pattern set of the DMRS includes the first time domain pattern set. The second preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. A specific implementation mode of the second preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, in the first time domain pattern set, there is no time domain overlap between the first time domain position and the second time domain position carrying the PSCCH.

Based on the above technical solution, in the first time domain pattern set, there may be no time domain overlapping between the first time domain position carrying the DMRS and the second time domain position carrying the PSCCH, i.e., the PSSCH carrying the DMRS does not multiplex the time-frequency resource occupied by the PSCCH, so that the problem of incomplete DMRS bearing in the case where the PSSCH carrying the DMRS multiplexes the time-frequency resource occupied by the PSCCH can be avoided; meanwhile, the problem of time domain filtering complexity of DMRS channel estimation caused by different numbers of DMRS symbols and different time domain positions on different frequency bands is avoided. Meanwhile, a specific implementation mode of the first time domain pattern set is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

determining that the target time domain pattern set of the DMRS includes the second time domain pattern set when the first channel bandwidth satisfies at least one of:

The first channel bandwidth is n sub-channel bandwidths, and n is a positive integer greater than 1; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is greater than a third preset value, either configured or preconfigured; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.

Based on the above technical solution, the terminal device determines that the target time domain pattern set includes the second time domain pattern set according to the association relationship between the first channel bandwidth and the configured or preconfigured subchannel bandwidth, and/or according to at least one of the conditions satisfied by the association relationship between the first channel bandwidth and the second channel bandwidth of the PSCCH. The method comprises the steps that a preset sub-channel bandwidth and/or a second channel bandwidth carrying PSCCH are used as the basis, the target time domain pattern set is determined to comprise the second time domain pattern set by combining the first channel bandwidth of the PSSCH, a specific implementation mode of determining the target time domain pattern set by the terminal equipment is provided, the feasibility of the scheme is improved, and therefore the implementation flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the third preset value includes bandwidths of 20 physical resource blocks PRB.

Based on the above technical solution, when the first channel bandwidth is greater than a configured or preconfigured third preset value, the terminal device determines that the target time domain pattern set of the DMRS includes the second time domain pattern set. The third preset value may specifically be associated with a preset bandwidth of PRBs, for example, the third preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. A specific implementation mode of the third preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the fourth preset value is 3 PRBs.

Based on the above technical solution, when the difference between the first channel bandwidth and the second channel bandwidth is greater than a configured or preconfigured fourth preset value, the terminal device determines that the target time domain pattern set of the DMRS includes the second time domain pattern set. The fourth preset value may specifically be associated with a preset bandwidth of PRBs, for example, the fourth preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or another value. A specific implementation mode of the fourth preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the target time domain pattern set includes a mapping relationship between the first time domain position and a target parameter;

the target parameters include a number of symbols for the first time domain position, a number of symbols for a second time domain position carrying the PSCCH, and a number of symbols for a third time domain position carrying the PSCCH and PSCCH.

The "number of symbols" may be represented by any one of the number of symbols, the number of time domain symbols, and the number of time domain symbols, or may be represented by any other means, and is not limited herein.

Based on the above technical solution, the target time domain pattern set may include a mapping relationship between a first time domain position and a target parameter, where the terminal device may determine, according to different target parameters, the first time domain position corresponding to different DMRS, so that the first time domain position of the DMRS is associated with a value of the target parameter. The terminal equipment can flexibly work under different target parameters and different frame structures, and the communication efficiency of the side uplink is further improved.

In a possible implementation manner of the first aspect of the embodiments of the present application, the method further includes:

Receiving a lateral control information SCI message, the SCI message being used to determine the first channel bandwidth; and/or the number of the groups of groups,

radio resource configuration information is received, the configuration information being used to determine the first channel bandwidth.

Based on the above technical solution, the terminal device may determine the first channel bandwidth of the PSSCH by receiving the SCI message, and/or the terminal device may determine the first channel bandwidth of the PSSCH by the radio resource configuration message. Therefore, various implementation manners of determining the first channel bandwidth of the PSSCH by the terminal equipment in the side uplink communication process are provided, so that the scheme is suitable for various application scenes, and the feasibility of the scheme is improved.

A second aspect of the embodiments of the present application provides a method for side-link communication, where the method may be applied to a terminal device, and may also be applied to component execution (such as a processor, a chip, or a chip system) of the terminal device, and in the method, the terminal device determines a first channel bandwidth of a side-link physical layer shared channel PSSCH; then, the terminal equipment determines the reference symbol number of the PSSCH according to the first channel bandwidth; thereafter, the terminal device determines a first time domain position of the DMRS according to the time domain pattern set of the demodulation reference signal DMRS and the number of reference symbols.

Based on the above technical solution, in the side uplink communication process, the terminal device determines the reference symbol number of the PSSCH according to the first channel bandwidth of the PSSCH, that is, the terminal device may determine the reference signal number of different PSSCHs according to the difference of the first channel bandwidths, and the first channel bandwidths of the different PSSCHs may determine the reference symbol number of different PSSCHs. And then, the terminal equipment determines the first time domain position of the DMRS according to the reference symbol number in the time domain pattern set of the DMRS, so that the terminal equipment can flexibly configure the DMRS according to different reference symbol numbers of the PSSCH, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, and the communication efficiency of the side uplink is improved.

The DMRS carried on the PSSCH may be represented by a DMRS, PSSCH DMRS, PSSCH-DMRS, or other means, and is not limited thereto. The "number of symbols" may be represented by any one of the number of symbols, the number of time domain symbols, and the number of time domain symbols, or by other means, and is not limited herein.

In a possible implementation manner of the second aspect of the embodiments of the present application, determining the number of reference symbols of the PSSCH according to the first channel bandwidth includes:

determining the number of reference symbols of the PSSCH according to a first manner when the first channel bandwidth satisfies at least one of:

Based on the above technical solution, the terminal device determines the number of reference symbols of the PSCCH according to the first mode when the association between the first channel bandwidth and the configured or preconfigured subchannel bandwidth and/or the association between the first channel bandwidth and the second channel bandwidth of the PSCCH meets at least one of the conditions. Wherein, the reference symbol number of the PSSCH is determined by using the configured or preconfigured sub-channel bandwidth and/or the second channel bandwidth carrying the PSCCH as the basis and combining the first channel bandwidth of the PSSCH, thereby providing a specific implementation way for the terminal device to determine the reference symbol number of the PSSCH, improving the realizability of the scheme and further improving the realization flexibility of the scheme.

In a possible implementation manner of the second aspect of the embodiments of the present application, the first preset value includes a bandwidth of 20 physical resource blocks PRB.

Based on the above technical solution, when the first channel bandwidth is a subchannel bandwidth and the subchannel bandwidth is smaller than a configured or preconfigured first preset value, the terminal device determines to determine the number of reference symbols of the PSSCH according to the first mode. The first preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. A specific implementation mode of the first preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the second preset value is 3 PRBs.

Based on the above technical solution, when the difference between the first channel bandwidth and the second channel bandwidth is smaller than the configured or preconfigured second preset value, the terminal device determines to determine the number of reference symbols of the PSSCH according to the first mode. The second preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. A specific implementation mode of the second preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, in the first aspect, the number of reference symbols of the PSSCH is determined by the number of side uplink SL transmission symbols, length slsymbol, and a target parameter, where the target parameter includes at least one of:

the number of symbols carrying the second time domain position of the PSCCH, or,

the number of symbols of the GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the automatic gain control (automatic gain control, AGC) in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the physical direct link feedback channel (physical sidelink feedback channel, PSFCH) within the sidelink transmission slot.

Based on the above technical solution, in the first aspect, the parameter symbol number of the PSSCH is determined by the side-link SL transmission symbol number, length slsymbol, and the target parameter, where the side-link SL transmission symbol number, length slsymbol, may be configured or preconfigured. Therefore, a specific implementation manner of the first mode is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the determining, by the side-link SL transmission symbol number length slsymbol and the target parameter, the reference symbol number of the PSSCH includes:

The reference symbol number of the PSSCH is the difference between the SL transmission symbol number and the target parameter.

Based on the above technical solution, in the first aspect, the number of reference symbols of the PSSCH may be a difference between the number of SL transmission symbols and the target parameter. In the first mode, a specific implementation mode of the reference symbol number of the PSSCH is provided, and the feasibility of the scheme is improved, so that the implementation flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a first symbol, where the first symbol is determined by a SL start symbol position startslsymbol and a time resource scch of the PSSCH, where the startslsymbol represents the start symbol position of the SL transmission slot, and the time resource scch represents a number of symbols carrying the second time domain position of the PSCCH.

Based on the above technical solution, the first time domain position of the DMRS may specifically be a time domain offset of the DMRS in the SL transmission slot relative to the first symbol, where the first symbol is determined by startslsymbol and timeresource scch. The startslsymbol and timeresourceps scch may be configured or preconfigured values in the SL transmission time slot, so that the first time domain position of the DMRS accords with a preset logic rule in the SL transmission time slot, and the method and the device are applicable to more application scenarios and promote the feasibility of the scheme.

In a possible implementation manner of the second aspect of the embodiments of the present application, determining, according to the first channel bandwidth, the target number of symbols associated with the PSSCH includes:

determining the number of reference symbols of the PSSCH according to a second manner when the first channel bandwidth meets at least one of:

Based on the above technical solution, the terminal device determines the number of reference symbols of the PSCCH according to the second mode according to the association relationship between the first channel bandwidth and the configured or preconfigured subchannel bandwidth and/or according to the fact that the association relationship between the first channel bandwidth and the second channel bandwidth carrying the PSCCH satisfies at least one of the conditions. The method comprises the steps that a preset sub-channel bandwidth and/or a second channel bandwidth carrying PSCCH are used as the basis, the target time domain pattern set is determined to comprise the second time domain pattern set by combining the first channel bandwidth of the PSSCH, a specific implementation mode of determining the number of reference symbols of the PSSCH according to a second mode is provided for a terminal device, the feasibility of the scheme is improved, and therefore the implementation flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the third preset value includes a bandwidth of 20 physical resource blocks PRB.

Based on the above technical solution, when the first channel bandwidth is greater than a configured or preconfigured third preset value, the terminal device determines to determine the number of reference symbols of the PSSCH according to the second mode. The third preset value may specifically be associated with a preset bandwidth of PRBs, for example, the third preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. A specific implementation mode of the third preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the fourth preset value is 3 PRBs.

Based on the above technical solution, when the difference between the first channel bandwidth and the second channel bandwidth is greater than a configured or preconfigured fourth preset value, the terminal device determines to determine the number of reference symbols of the PSSCH according to the second mode. The fourth preset value may specifically be associated with a preset bandwidth of PRBs, for example, the fourth preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or another value. A specific implementation mode of the fourth preset value is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, in the second aspect, the number of reference symbols of the PSSCH is determined by the length slsymbol and a target parameter, where the target parameter includes at least one of the following:

the number of symbols of GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of AGC symbols in the side transmission time slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the PSFCH in the sidelink transmission slot.

Based on the above technical solution, in the second aspect, the parameter symbol number of the PSSCH is determined by the side-link SL transmission symbol number, length slsymbol, and the target parameter, where the side-link SL transmission symbol number, length slsymbol, may be a configured or preconfigured value. Therefore, a specific implementation manner of the second mode is provided, and the realizability of the scheme is improved, so that the realization flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the determining, by the length slsymbol and the target parameter, the number of reference symbols of the PSSCH includes:

Based on the above technical solution, in the second aspect, the number of reference symbols of the PSSCH may be a difference between the number of SL transmission symbols and the target parameter. In the second mode, a specific implementation mode of the reference symbol number of the PSSCH is provided, and the feasibility of the scheme is improved, so that the implementation flexibility of the scheme is improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a start symbol position startslsymbol, where the start slsymbol represents the start symbol position of the SL transmission slot.

Based on the above technical solution, the first time domain position of the DMRS may specifically be a time domain offset of the DMRS in the SL transmission time slot relative to startSLsymbols. The startslsymbol may be a configured or preconfigured value in the SL transmission time slot, so that the first time domain position of the DMRS accords with a preset logic rule in the SL transmission time slot, which may be suitable for more application scenarios, and improves the feasibility of the scheme.

In a possible implementation manner of the second aspect of the embodiments of the present application, the target time domain pattern set includes a mapping relationship between the first time domain position and a preset parameter;

the preset parameters include the number of reference symbols of the PSSCH, the number of symbols of the first time domain location, and the number of symbols of the second time domain location carrying the PSCCH.

Based on the above technical solution, the target time domain pattern set may include a mapping relationship between a first time domain position and a preset parameter, where the terminal device may determine, according to different preset parameters, the first time domain position corresponding to different DMRS, so that the first time domain position of the DMRS is associated with implementation of the preset parameter. The terminal equipment can flexibly work under different preset parameters and different frame structures, and the communication efficiency of the side uplink is further improved.

In a possible implementation manner of the second aspect of the embodiments of the present application, the method further includes:

a radio resource control, RRC, message is received, the RRC message being used to determine the first channel bandwidth.

Based on the above technical solution, the terminal device may determine the first channel bandwidth of the PSSCH through the received SCI message, and/or the terminal device may determine the first channel bandwidth of the PSSCH through the radio resource configuration message. Therefore, various implementation manners of determining the first channel bandwidth of the PSSCH by the terminal equipment in the side uplink communication process are provided, so that the scheme is suitable for various application scenes, and the feasibility of the scheme is improved.

A third aspect of the embodiments of the present application provides a side-uplink communication device, including a processing unit;

the processing unit is used for determining a first channel bandwidth of a side downlink physical layer shared channel PSSCH;

the processing unit is further configured to determine a target time domain pattern set of a demodulation reference signal DMRS according to the first channel bandwidth, where the DMRS is carried on the PSSCH, and the target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, and the first time domain pattern set is different from the second time domain pattern set;

The processing unit is further configured to determine a first time domain location of the DMRS according to the target time domain pattern set.

In a possible implementation manner of the third aspect of the embodiments of the present application, the processing unit is specifically configured to:

In a possible implementation manner of the third aspect of the embodiments of the present application, the first preset value includes bandwidths of 20 physical resource blocks PRB.

In a possible implementation manner of the third aspect of the embodiments of the present application, the second preset value is 3 PRBs.

In a possible implementation manner of the third aspect of the embodiments of the present application, in the first time domain pattern set, there is no time domain overlap between the first time domain position and the second time domain position carrying the PSCCH.

In a possible implementation manner of the third aspect of the embodiments of the present application, the third preset value includes a bandwidth of 20 physical resource blocks PRB.

In a possible implementation manner of the third aspect of the embodiments of the present application, the fourth preset value is 3 PRBs.

In a possible implementation manner of the third aspect of the embodiments of the present application, the target time domain pattern set includes a mapping relationship between the first time domain position and a target parameter;

The target parameters include a number of symbols for the first time domain position, a number of symbols for a second time domain position carrying the PSCCH, and a number of symbols for a third time domain position carrying the PSCCH and the PSCCH.

In a possible implementation manner of the third aspect of the embodiments of the present application, the apparatus further includes a transceiver unit:

the receiving and transmitting unit is used for receiving a lateral control information SCI message, wherein the SCI message is used for determining the first channel bandwidth; and/or the number of the groups of groups,

the transceiver unit is configured to receive radio resource configuration information, where the configuration information is used to determine the first channel bandwidth.

For specific implementation steps of the third aspect of the present application and various possible implementations of the third aspect, and the beneficial effects caused by each possible implementation, reference may be made to descriptions in various possible implementations of the first aspect, which are not described in detail herein.

A fourth aspect of the present application provides a side-uplink communication device, including a processing unit:

the processing unit is further configured to determine a number of reference symbols of the PSSCH according to the first channel bandwidth;

The processing unit is further configured to determine a first time domain position of the DMRS according to the time domain pattern set of the demodulation reference signal DMRS and the number of reference symbols.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the processing unit is specifically configured to:

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first preset value includes a bandwidth of 20 physical resource blocks PRB.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the second preset value is 3 PRBs.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, in the first aspect, the number of reference symbols of the PSSCH is determined by the number of side uplink SL transmission symbols, length slsymbol, and a target parameter, where the target parameter includes at least one of:

the number of symbols of the PSFCH in the sidelink transmission slot.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the determining, by the side-link SL transmission symbol number length slsymbol and the target parameter, the reference symbol number of the PSSCH includes:

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a first symbol, where the first symbol is determined by a SL start symbol position startslsymbol and a time resource scch of the PSSCH, where the startslsymbol represents the start symbol position of the SL transmission slot, and the time resource scch represents a number of symbols carrying the second time domain position of the PSCCH.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the determining, according to the first channel bandwidth, the target symbol number associated with the PSSCH includes:

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the third preset value includes a bandwidth of 20 physical resource blocks PRB.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the fourth preset value is 3 PRBs.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, in the second aspect, the number of reference symbols of the PSSCH is determined by the length slsymbol and a target parameter, where the target parameter includes at least one of the following:

the number of symbols of the PSFCH in the sidelink transmission slot.

The method is characterized in that the reference symbol number of the PSSCH is determined by the LenthSLsymbols and the target parameters and comprises the following steps:

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a start symbol position startslsymbol, where the start slsymbol represents the start symbol position of the SL transmission slot.

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the target time domain pattern set includes a mapping relationship between the first time domain position and a preset parameter;

In a possible implementation manner of the fourth aspect of the embodiments of the present application, the apparatus further includes a transceiver unit:

The transceiver unit is configured to receive a radio resource control RRC message, where the RRC message is used to determine the first channel bandwidth.

For specific implementation steps of the fourth aspect and various possible implementations of the fourth aspect of the present application, and the beneficial effects caused by each possible implementation, reference may be made to descriptions in the various possible implementations of the second aspect, which are not described herein in detail.

A fifth aspect of the embodiments of the present application provides a communication device, where the communication device includes a processor and a communication interface, where the communication interface is coupled to the processor, and where the processor is configured to execute a computer program or instructions, to perform a method according to any one of the foregoing first aspect or any one of the foregoing possible implementation manners of the first aspect, or to perform a method according to any one of the foregoing second aspect or any one of the possible implementation manners of the second aspect.

A sixth aspect of the embodiments of the present application provides a communication device, wherein the communication device includes a processor, the processor being coupled to a memory, the memory being configured to store a computer program or instructions, the processor being configured to execute the computer program or instructions in the memory, such that the method according to any one of the foregoing first aspect or any one of the foregoing possible implementation manners of the first aspect is executed, or such that the method according to any one of the foregoing second aspect or any one of the possible implementation manners of the second aspect is executed.

A seventh aspect of the embodiments of the present application provides a computer-readable storage medium storing one or more computer-executable instructions, which when executed by a processor performs any one of the possible implementations of the first aspect or the first aspect, or performs a method as described in any one of the possible implementations of the second aspect or the second aspect.

An eighth aspect of the embodiments of the present application provides a computer program product (or computer program) storing one or more computers, which when executed by the processor performs any one of the possible implementations of the first aspect or the first aspect, or performs the method as described in any one of the possible implementations of the second aspect or the second aspect.

A ninth aspect of the embodiments of the present application provides a chip system, which includes a processor, configured to support a communication device to implement any one of the foregoing first aspect or any one of the foregoing possible implementation manners of the first aspect, or implement a function involved in any one of the foregoing second aspect or any one of the foregoing possible implementation manners of the second aspect. In one possible design, the system on a chip may further include a memory to hold the program instructions and data necessary for the access network device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

A tenth aspect of the embodiments of the present application provides a communication system comprising at least one communication device of the third to ninth aspects and any one of its possible implementation manners.

The technical effects of the third aspect to the tenth aspect or any one of the possible implementation manners of the third aspect may be referred to the technical effects of the first aspect or the different possible implementation manners of the first aspect, or the technical effects of the second aspect or the different possible implementation manners of the second aspect, which are not described herein.

From the above technical solutions, in some embodiments provided in the present application, the following advantages are provided: in the side-link communication process, the terminal equipment determines a target time domain pattern set of the DMRS according to a first channel bandwidth of the PSSCH, and further determines a first time domain position of the DMRS according to the target time domain pattern set. The target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, that is, the terminal device may determine the first time domain position of the DMRS in at least two different time domain pattern sets according to the difference of the first channel bandwidths of the PSSCH. Therefore, in the side-link communication process, the flexible configuration of the DMRS is provided, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, so that the communication efficiency of the side-link is improved.

Drawings

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

fig. 2 is a schematic diagram of another communication system according to an embodiment of the present application;

fig. 3 is a schematic diagram of a side-uplink communication procedure according to an embodiment of the present application;

FIG. 4 is a schematic diagram of another side-uplink communication process provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of another side-uplink communication process provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of another side-uplink communication process provided by an embodiment of the present application;

fig. 7 is a schematic diagram of a side uplink communication method according to an embodiment of the present application;

fig. 8 is a schematic diagram of another side-uplink communication method according to an embodiment of the present application;

fig. 9 is a schematic diagram of a communication device according to an embodiment of the present application;

fig. 10 is a schematic diagram of another communication device according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

First, some terms in the embodiments of the present application are explained for easy understanding by those skilled in the art.

1. The terminal device comprises a device for providing voice to a user, a device for providing data connectivity to the user and a device for providing voice and data connectivity to the user. For example, may include a handheld device having wireless connectivity, or a processing device connected to a wireless modem. May also be referred to as a terminal for short. The terminal may communicate with a core network via a radio access network (radio access network, RAN), exchange voice or data with the RAN, or interact voice and data with the RAN. The terminal may include a User Equipment (UE), a wireless terminal, a mobile terminal, a device-to-device (D2D) terminal, a vehicle-to-all (vehicle to everything, V2X) terminal, a Road Side Unit (RSU), a machine-to-machine/machine-type communication (M2M/MTC) terminal, an internet of things (internet of things, ioT) terminal, a subscriber unit (subscriber station), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an Access Point (AP), a remote terminal (remote), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), or a user equipment (user device), etc. May include mobile telephones (or "cellular" telephones), computers with mobile terminals, portable, pocket, hand-held, computer-built-in mobile devices, and the like. May include personal communication services (personal communication service, PCS) phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDAs), and the like. Also included are limited devices, devices with lower power consumption, or devices with limited storage capacity, or devices with limited computing capacity, etc. Information sensing devices may include bar codes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning systems (global positioning system, GPS), laser scanners, and the like.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device or an intelligent wearable device, and is a generic name for intelligently designing daily wear and developing wearable devices, such as glasses, gloves, watches, clothes, shoes, and the like, by applying wearable technology. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

While the various terminals described above, if located on a vehicle, such as placed in a vehicle or mounted in a vehicle, may be considered as in-vehicle terminals, such as also known as in-vehicle units (OBUs).

In the embodiment of the present application, the device for implementing the function of the terminal may be the terminal, or may be a circuit capable of supporting the terminal to implement the function, for example, a circuit that may be applied to a chip system, which may be installed in the terminal. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiments of the present application, the device for implementing the function of the terminal is an example of the terminal, and the technical solution provided in the embodiments of the present application is described.

2. The network devices to which the present application relates may include radio access network (radio access network, RAN) devices, such as base stations (e.g., access points). May refer to a device in an access network that communicates with a terminal device over an air interface, or a network device in a vehicle-to-everything (V2X) technology is a Road Side Unit (RSU). The base station may be configured to inter-convert the received air frames with IP packets as a router between the terminal and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting V2X applications exchanging messages with other entities supporting V2X applications. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved base station (evolutional Node B, nodeB or eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system or an advanced long term evolution (long term evolution-advanced, LTE-a) system, or may also include an evolved packet core network (evolved packet core, EPC), a fifth generation communication technology (5th generation,5G), a next generation node B (next generation node B, gNB) in a New Radio (NR) system (also referred to as an NR system for short), or a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud access network (Cloud radio access network, cloud RAN) system, to which embodiments of the present application are not limited. The network device may also comprise a core network device comprising, for example, access and mobility management functions (access and mobility management function, AMF) and the like. It should be noted that the RSU may be a network RSU or a terminal RSU. When acting as a network-like RSU, it performs the function of a network-like device; when acting as a terminal device class RSU, it performs the functions of a terminal device.

The network device can send configuration information (for example, carried in a scheduling message and/or an indication message) to the terminal device, and the terminal device further performs network configuration according to the configuration information, so that network configuration between the network device and the terminal device is aligned; or, the network configuration between the network device and the terminal device is aligned through the network configuration preset in the network device and the network configuration preset in the terminal device. Specifically, "alignment" refers to the coincidence of the two understandings of the carrier frequency of the interactive messaging, the determination of the type of interactive message, the meaning of field information carried in the interactive message, or other configuration of the interactive message, when there is an interactive message between the network device and the terminal device.

Furthermore, the network device may be other means of providing wireless communication functionality for the terminal device, as other possibilities. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device. For convenience of description, embodiments of the present application are not limited.

The network devices may also include core network devices including, for example, AMFs, user plane functions (user plane function, UPF), or session management functions (session management function, SMF), etc.

In the embodiment of the present application, the means for implementing the function of the network device may be the network device, or may be a means capable of supporting the network device to implement the function, for example, a chip system, and the apparatus may be installed in the network device. In the technical solution provided in the application embodiment, the device for implementing the function of the network device is exemplified by the network device, and the technical solution provided in the application embodiment is described.

3. Side Link (SL)

In V2X, the terminal device can communicate in two ways. The first way is communication between terminal devices through Uu interface. The Uu interface refers to a wireless interface between terminal equipment and network equipment, and communication between the terminal equipment needs to be forwarded through nodes such as the network equipment. The second mode is that the side communication is carried out between the terminal devices, namely, the direct communication can be carried out between the terminal devices without forwarding of network devices. At this time, links directly connected to each other between the terminal devices are called side links.

In general, terminal devices in the sip technology may directly connect information through a PC5 interface between each other. In this application, the side link may be expressed by english sidlink or by side link, and both the meanings are the same, which is the expression of english on the side link in this application. The technology can provide information interaction not only in the coverage service range of the network equipment, but also in places without coverage of the network equipment. Terminal devices authorized for use as special communications may take the form of a Sidelink communication. Of course, the sidlink communication may be used for transmitting service data of intelligent traffic, and may also be used for transmitting mobile internet service, which is not limited in this application.

4. Side-uplink control information (sidelink control information, SCI)

The side-link control information contains side-chain scheduling information or necessary indication information for side-line transmission, such as indication information of time-frequency resource blocks used at the time of transmission, modulation and coding scheme, source identification ID, destination identification ID, and the like. In NR, V2X side-link control information is transmitted in two phases.

The first stage SCI (the first stage SCI) is carried on a physical Sidelink control channel (physical Sidelink control channel, PSCCH) and contains information for sensing operations and information about the PSSCH resource allocation. The first stage SCI may also be referred to as a first stage SCI.

The second stage SCI is carried on a physical Sidelink shared channel (physical Sidelink shared channel, PSSCH), and the second stage SCI (the second stage SCI) carries information required to identify and/or decode the associated Sidelink shared channel (Sidelink shared channel, SL-SCH), as well as indication information of a hybrid automatic repeat request (hybrid automatic repeat request, HARQ), channel state information reference signal (channel state information reference signal, CSI-RS) indication information, and the like. The second stage SCI may also be referred to as a second stage SCI.

5. Resource pool (resource pool)

In V2X, the network device may configure a resource pool for SL communication of the V2X terminal device, where one resource pool is a set of time-frequency resources. Two resource allocation modes are defined in V2X:

mode 1 (mode 1) the network device schedules or configures the Sidelink resource for the terminal device to perform Sidelink transmission;

mode 2 (mode 2) terminal device autonomous resource selection.

5-1, mode 2 (mode 2)

The basic way is that the UE senses which resources are not used by other UEs in a (pre) configured pool of resources and selects an appropriate number of such resources for its own transmission. V2X supports resource sensing (sensing) and selecting or reselecting processes in the mode 2, and the sensing process can also be based on SCI information of other terminal equipment or other Sidelink measurement results, and the SCI information is demodulated to reflect the resource use condition on the Sidelink. The resource selection or reselection procedure may determine resources for the Sidelink transmission based on the sensing procedure results described above.

6. Time slot (slot)

In an NR system, a slot is the smallest scheduling unit of time. The time is divided into periodic frames, each frame is subdivided into a plurality of time slots, no matter the frames or the time slots are mutually non-overlapped, and each time slot is a basic unit of communication. The duration of the time slot is determined by the subcarrier spacing used in the transmission. For example, for a 15kHz subcarrier spacing, the duration of one slot may be 1ms. As another example, the duration of one slot for a 30kHz subcarrier spacing may be 0.5ms. For another example, the duration of one slot for a 60kHz subcarrier spacing may be 0.25ms. For another example, the duration of one slot for a 120kHz subcarrier spacing may be 0.125ms.

Alternatively, when one slot is used as the basic scheduling unit, all symbols of one slot may be used for transmission, or some symbols in one slot may be used for transmission, which is not limited in the present invention. For example, the number of symbols in one slot may be 12 symbols or 14 symbols. In the 14 symbol example, the last symbol may be used for transception-converted symbols, where only 13 symbols are used for side-row transmission.

7. The technical solution of the embodiment of the application can be applied to various communication systems, for example: LTE systems, worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication systems, fifth generation (5th generation,5G) systems such as NR, and future communication systems such as 6G systems.

8. Configuration and pre-configuration

In the present invention, both configuration and pre-configuration are used. The configuration refers to that the base station or the server sends configuration information of some parameters or values of the parameters to the terminal through messages or signaling, so that the terminal determines the parameters of communication or resources during transmission according to the values or the information. The pre-configuration is similar to the configuration, and the pre-configuration can be a mode that a base station or a server transmits parameter information or a value to a terminal through another link or carrier wave which is different from a side line; the corresponding parameters or parameter values may be defined or written into the terminal device in advance. The invention is not limited in this regard. Further, these values and parameters may be changed or updated.

9. The terms "system" and "network" in embodiments of the present application may be used interchangeably. "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: cases where A alone, both A and B together, and B alone, where A and B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one of A, B, and C" includes A, B, C, AB, AC, BC, or ABC. And, unless otherwise specified, references to "first," "second," etc. in the embodiments herein are for distinguishing between multiple objects and not for defining the order, timing, priority, or importance of the multiple objects.

The present application may be applied to a long term evolution (long term evolution, LTE) system, a New Radio (NR) system, or other communication systems, where the communication system includes a network device and a terminal device, where the network device is used as a configuration information transmitting entity, and the terminal device is used as a configuration information receiving entity. Specifically, in the communication system, a presentity sends configuration information to another entity, and sends data to the other entity or receives data sent by the other entity; the other entity receives the configuration information and sends data to the configuration information sending entity or receives the data sent by the configuration information sending entity according to the configuration information. The application is applicable to terminal equipment in a connected state or an active state (active), and also applicable to terminal equipment in a non-connected state (inactive) or an idle state (idle).

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application. The configuration information sending entity may be a network device, where the network device is illustrated by taking a base station (base station) as an example. For example, in a cellular link (cellular link), the transmitting device may be a base station and the receiving device may be a terminal; alternatively, the transmitting device may be a terminal and the receiving device may be a base station.

Alternatively, as shown in the left side of fig. 1, the configuration information receiving entity may be UE1 and UE2, in the communication system, UE1 and UE2 may each communicate with a base station, and send uplink data to the base station, where the base station needs to receive the uplink data sent by UE1 and UE2, so as to implement communication between UE1 and UE 2.

Alternatively, as shown on the right side of fig. 1, the configuration information receiving entity may be UE1, and the communication procedure of UE1 is similar to that shown on the left side of fig. 1. UE2 receives the configuration information through forwarding by UE 1. In the communication system, UE2 sends uplink data to UE1, and UE1 forwards the uplink data to the base station to realize communication between UE2 and the base station.

Fig. 2 is a schematic diagram of another communication system according to an embodiment of the present application. As shown in the figure, in a Sidelink (SL), in general, a transmitting device and a receiving device may be an equivalent type of user equipment or network equipment, or may be a Road Side Unit (RSU) and a user terminal, where the RSU is a road side station or road side unit from a physical entity, and from a functional point of view, the RSU may be a terminal device or a network device. Namely, the transmitting equipment is a user terminal, and the receiving equipment is also a user terminal; alternatively, the transmitting device is a roadside station and the receiving device is a user terminal; alternatively, the transmitting device is a user terminal and the receiving device is a roadside station. In addition, the side links may be the same type or different types of base station apparatuses, and the functions of the side links at this time are similar to those of the relay links, but the air interface technologies used may be the same or different.

For example, one terminal device may communicate with another terminal device through a relay of a network device, or may communicate with another terminal device directly without passing through the network device, and when one terminal device communicates with another terminal device directly without passing through the network device, a communication link between the two terminal devices may be referred to as a Sidelink (SL) or a through link.

With the development of wireless communication technology, there is an increasing demand for high data rates and user experiences, while there is an increasing demand for proximity services for learning about and communicating with surrounding people or things, so device-to-device (D2D) technology has grown. The application of the D2D technology can reduce the burden of a cellular network, reduce the battery power consumption of user equipment, improve the data rate and well meet the requirement of the proximity service. D2D technology allows a plurality of D2D-enabled terminal devices to directly discover and directly communicate with or without a network infrastructure. In view of the characteristics and advantages of the D2D technology, a vehicle networking application scenario based on the D2D technology is proposed, but due to concerns about security, the requirement on time delay in the scenario is very high, and the existing D2D technology cannot be realized.

The sidelink is a new link type introduced to support direct communication between V2X devices, and was introduced in the D2D application scenario at the earliest. Under the network of long term evolution (long term evolution, LTE) technology proposed by the third generation partnership project (the 3rd generation partnership project, abbreviated as 3 GPP), vehicle-to-anything communication (V2X) is proposed, V2X communication refers to vehicle-to-outside anything communication, including vehicle-to-vehicle communication (vehicle to vehicle, V2V), vehicle-to-pedestrian communication (vehicle to pedestrian, V2P), vehicle-to-infrastructure communication (vehicle to infrastructure, V2I), vehicle-to-network communication (vehicle to network, V2N).

V2X communication is a basic technology and a key technology applied to high-speed equipment represented by vehicles in the scene with very high requirements on communication delay in the future, such as intelligent automobiles, automatic driving, intelligent transportation systems and the like. The LTE V2X communication may support communication scenarios with and without network coverage, and the resource allocation manner may be a network access device scheduling mode, such as an evolved universal terrestrial radio access network node B (E-UTRAN node B) scheduling mode and a UE self-selection mode. Based on V2X technology, a vehicle user (V-UE) can send some information of itself, such as information of position, speed, intention (turning, doubling, reversing) and some non-periodic event-triggered information to surrounding V-UEs, and similarly, the V-UEs can also receive information of surrounding users in real time. The 3GPP standards organization officially promulgates the first generation LTE V2X standard, LTE Release number Release 14 in the early 2017.

LTE V2X addresses some of the partially basic requirements in V2X scenarios, but for future fully intelligent driving, autopilot, etc. application scenarios, LTE V2X at the present stage is not yet supported effectively. With the development of 5G NR technology in 3GPP standard organization, 5G NR v2x will also further develop, for example, lower transmission delay, more reliable communication transmission, higher throughput, and better user experience can be supported, so as to meet the requirements of wider application scenarios. NR-V2X therefore proposes to support a reliable transmission of 99.99% or even 99.999%. Meanwhile, in order to support different service demands, NR-V2X is also required to support service forms such as non-unicast, multicast, broadcast and the like. Existing LTE-V2X has failed to meet the above performance requirements.

In the sidelink communication system, channel types mainly included in the physical layer mainly include a physical sidelink control channel (physical sidelink control channel, PSCCH), a physical sidelink shared channel (physical sidelink shared channel, PSSCH), a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH), and the like. The information carried by the PSCCH is called first control information, and includes physical layer resource information of the PSCCH, configuration information of demodulation reference signals (demodulation reference signal, DMRS), DMRS port numbers, modulation and coding schemes (modulation and coding scheme, MCS), format of the second control information, and the like. The PSSCH carries data information and second control information, and the data information and the second control information are multiplexed in the PSSCH. The second control information mainly carries other control information except data channel demodulation, including information such as channel state information (channel state information, CSI) reporting trigger information, an internet protocol (internet protocol, IP) address of a destination user of the PSSCH, a PSSCH side row hybrid automatic repeat request (hybrid automatic repeatrequest, HARQ) process number, a new data transmission indication (new data indicator), and a HARQ transmission version number.

In the frequency domain of the sidelink, a concept of sub-channel (sub-channel) is defined, one sub-channel includes a plurality of Resource Blocks (RBs) that are continuous in the frequency domain, and the sub-channel size can be configured by the network device or pre-configured in advance. Any sub-channel can be used for transmitting the V2X data information, and the PSSCH can occupy one or more sub-channels for transmission. The starting symbol position startSLsymbols, SL of the transmission unit of the RRC configured SL in the time domain contains the number of consecutive transmission symbols, lenghlslsymbols, in the slot. For example, the start symbol of SL is 0 and the number of symbols included is 14, i.e. the transmission unit of each SL is one slot. Further, the PSCCH and PSSCH in NR sidelink occupy one SL transmission unit in the manner shown in fig. 3. Wherein the PSCCH and PSSCH transmitted by the terminal device at a time may occupy one or a consecutive plurality of sub-channels, as shown by the shaded portion in fig. 3. When a single transmission of the terminal device occupies multiple sub-channels, the lowest RB index of the PSCCH is aligned with the PSSCH, i.e., the start position of the PSCCH is the same as the start position of the PSSCH in the frequency domain. And except for PSCCH occupied resources, the rest can be PSSCH occupied.

Optionally, a SL transmission unit cannot use the last symbol of the continuous symbol number of the slot to transmit data, and fixes the GAP between transmission and reception. In addition, the first symbol is a simple repetition of the second symbol, and functionally, mainly for the automatic gain control design of the receiving end, considering that the number and power of the received signals are different in each slot of the SL, the radio frequency parameters need to be adjusted at the beginning of each SL to ensure the quality of the received signals.

In the SL communication system, configuration information of the DMRS is carried on the PSCCH, where the configuration information is used to determine the number of DMRS symbols mapped by the PSCCH, that is, the number of symbols carrying the first time domain position of the DMRS. The receiving device in the SL system determines the first time domain position of the DMRS on the PSSCH of the SL transmission unit according to the symbol number of the first time domain position, and demodulates the data in the PSSCH by using the DMRS. In this and subsequent embodiments, the DMRS carried on the PSSCH may be represented by a DMRS, may be represented by PSSCH DMRS, may be represented by a PSSCH-DMRS, or may be represented by another means, and is not limited thereto.

Currently, in NR sidelink, PSCCH and PSSCH occupy the same SL transmission unit, and in the SL transmission unit, all the other resources except for the resources occupied by PSCCH may be occupied by PSSCH, that is, the PSSCH may multiplex the time domain resources occupied by PSCCH. For example, a DMRS on a PSCCH may multiplex the time domain resources occupied by the PSCCH.

Wherein the PSCCH frequency domain is limited to one sub-channel, whose time domain starts mapping from one symbol after the AGC symbol, i.e. from the startslsymbols+1 symbol. In addition, SL is a distributed system in which the relative speed of different terminal devices communicating between SL systems varies considerably. To solve the problem of different channel correlation times caused by speed, the NR-V2X system allows a plurality of PSSCH DMRS time domain patterns to be configured on the resource pool, and the originating user selects different PSSCH DMRS time domain patterns to transmit according to the speed, and indicates the used pattern indication information in the SCI, as shown in table 1 below.

In Table 1, "l _d in symbols "denotes the number of symbols carrying the third time domain positions of the PSSCH and PSCCH in the SL transmission slot; "DM-RS position

"means carrying DMRSA first time domain position, i.e., a time domain position of the DMRS, is a time domain offset from a first symbol of the sidelink transmission resource (i.e., a SL start symbol position startSLsymbols); "PSCCH duration 2 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 2; "PSCCH duration 3 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 3; "Number of PSSCH DM-RS" indicates the number of symbols carrying the first time domain position of the DMRS in the SL transmission slot. Wherein in a time division multiplexing (time division multiplexing, TDM) scenario, since both PSSCH and PSCCH are not multiplexed in SL transmission slots, then "l" is _d The value of in symbols may be the sum of the number of symbols carrying the PSSCH and the number of symbols carrying the PSCCH; in a frequency division multiplexing (frequency division multiplexing, FDM) scenario, since there are overlapping symbols in the SL transmission slots for both PSSCH and PSCCH, i.e., both PSSCH and PSCCH are carried on the symbols of the PSSCH, then "l _d The value of in symbols "may be the number of symbols carrying the PSSCH.

In the SL communication process, the transmitting end determines PSSCH DMRS the time domain mapping position in table 1 according to the number of symbols (PSCCH duration symbols) of the second time domain position carrying the PSCCH and the number of symbols of the first time domain position carrying the DMRS to be transmitted according to the data at this time, i.e. "DM-RS position

". A scenario suitable for PSCCH and PSSCH DMRS that may be frequency division multiplexed is illustrated as an example in fig. 4. In fig. 4, for example, the SL transmission slots take symbols 0 to 13 as examples, the second time domain position carrying the PSCCH is symbols 1 to 3, the number of symbols carrying the second time domain position of the PSCCH is 3, the number of symbols carrying the third time domain positions of the PSCCH and the PSCCH is 6, where, as can be obtained from table 1, the time domain offset of the time domain position of the DMRS from the first symbol of the side transmission resource is 1,5.

TABLE 1

Because of the nature of sidestream communications, the PSSCH is required to contain at least 2 PSSCH DMRS time domain symbols in the SL transmission slot, and typically, if fewer than 2 DRMS columns, channel estimation is prone to inaccuracy. When the data channel occupies one sub-channel transmission, there are 2 mapping structures as shown in fig. 5 and 6. For the time-division frame structure shown in fig. 5, that is, the PSCCH has the same bandwidth as the sub-channel, when the PSCCH occupies one sub-channel for transmission, a completely time-division scenario of the control channel and the data channel shown in fig. 5 occurs. For the frequency-divided frame structure shown in fig. 6, i.e. PSCCH is smaller than the subchannel bandwidth. Since the sidestream system defines that PSSCH DMRS cannot be frequency division multiplexed with the PSCCH on one orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol when the PSSCH occupies only one subchannel and the subchannel bandwidth is less than 20 PRBs. At this time, if PSSCH DMRS and PSCCH are allowed to overlap in the time domain, on the one hand, the amount of mapped data on the symbol of PSSCH DMRS is too small, the error is large when the terminal device performs channel estimation based on the DMRS, and when the DMRS is used to demodulate the data in the PSSCH due to error propagation, the probability of demodulation failure is greatly increased, resulting in unstable system; on the other hand, the complexity of time domain filtering of DMRS channel estimation increases due to the different numbers of PSSCH DMRS time domain symbols on different RBs.

For the two scenes, according to the design of PSSCH DMRS mapping positions shown in table 1, when the number of symbols contained in the sidestream channel is smaller, i _d For three scenarios of 6/7/8, PSSCH DMRS can only map 1 column of demodulation reference signals. When ld is larger, since the symbol 1 cannot map the demodulation reference signal any more, two configurations with the number of PSSCH DMRS symbols being 2 occur, that is, the receiving end device cannot determine the symbol position of the transmitting end device for mapping the DMRS according to the table 1.

In order to solve the above-mentioned problems, the embodiments of the present application provide various solutions, which may be implemented from different angles of solving the problems, and will be described in detail below.

Fig. 7 is a schematic diagram of a side-link communication method according to an embodiment of the present application, and as shown in fig. 7, the side-link communication method includes the following steps.

S101, determining a first channel bandwidth of a side downlink physical layer shared channel PSSCH.

In this embodiment, the terminal device determines in step S101 that the channel bandwidth of the PSSCH in the SL transmission slot is the first channel bandwidth.

In one possible implementation, the terminal device may obtain the first channel bandwidth of the PSSCH in a plurality of ways.

Optionally, before step S101, the terminal device receives a sidestream control information SCI message sent by another device; in step S101, the terminal device determines a first channel bandwidth of the PSSCH according to the SCI message. Specifically, the SCI message may carry the bandwidth information of the PSSCH corresponding to the PSCCH, for example, the bandwidth information of the PSSCH may include the number of subchannels. The terminal device further determines the number of PRBs contained in the sub-channel according to the configuration on the resource pool. In step S101, the terminal device combines the number of sub-channels and the number of PRBs contained in the sub-channels to obtain the number of PRBs occupied by the PSSCH, thereby determining the first channel bandwidth occupied by the PSSCH.

Optionally, before step S101, the terminal device receives radio resource configuration information, where the radio resource configuration information is used to determine the first channel bandwidth. Specifically, in a mode1 scene, the network side informs a physical resource of side communication of the terminal equipment through downlink control information, wherein the physical resource comprises first channel bandwidth indication information; in the mode2 scenario, the higher layer of the terminal device determines the physical resources of the sidestream communication, and informs the physical layer of the value of the first channel bandwidth through interlayer primitives.

S102, determining a target time domain pattern set of the demodulation reference signal (DMRS) according to the first channel bandwidth.

In this embodiment, the terminal device determines the target time domain pattern set of the demodulation reference signal DMRS according to the first channel bandwidth obtained in step S101. Wherein the DMRS is carried on the PSSCH, the target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, and the first time domain pattern set is different from the second time domain pattern set.

In one possible implementation, the target time domain pattern set includes a mapping relationship between a first time domain position of the DMRS and a target parameter, where the target parameter may include a number of symbols of the first time domain position, a number of symbols of a second time domain position carrying the PSCCH, and a number of symbols of a third time domain position carrying the PSCCH and the PSCCH. Specifically, the target time domain pattern set may include a mapping relationship between a first time domain position and a target parameter, where the terminal device may determine, according to different target parameters, the first time domain position corresponding to different DMRS, so that the first time domain position of the DMRS is associated with a value of the target parameter. The terminal equipment can flexibly work under different target parameters and different frame structures, and the communication efficiency of the side uplink can be improved.

In a possible implementation manner, in step S102, the terminal device may determine that the target time domain pattern set of the DMRS is the first time domain pattern set or the second time domain pattern set according to the difference of the first channel bandwidths obtained in step S101, and these two cases will be described separately below.

1. When the first channel bandwidth obtained in step S101 meets at least one of the following, determining that the target time domain pattern set of the DMRS is the first time domain pattern set includes:

1) The first channel bandwidth is a sub-channel bandwidth and the sub-channel bandwidth is equal to the second channel bandwidth of the side-uplink physical layer control channel PSCCH.

Specifically, the subchannel bandwidth may be a configured or preconfigured subchannel bandwidth in the SL transmission timeslot, where the preset subchannel bandwidth may be configured in configuration information of the resource pool, for example, the subchannel bandwidth is determined by a parameter "side-downlink subchannel bandwidth SL-subbhannelsize" in "side-downlink resource pool configuration information SL-resource pool", or the subchannel bandwidth is preconfigured in the terminal device, which is not limited herein. The second channel bandwidth of the bearer PSCCH may also be preconfigured in the configuration information of the resource pool, for example, the second channel bandwidth of the bearer PSCCH is determined by a parameter "frequency domain resource (frequency resource scch)" in "configuration information sl-resource pool of the side-link resource pool", or the second channel bandwidth of the PSCCH is preconfigured in the terminal device, which is not limited herein.

In step S102, when the first channel bandwidth is a configured or preconfigured subchannel bandwidth and the configured or preconfigured subchannel bandwidth is equal to the second channel bandwidth of the PSCCH, the terminal device may determine that the target time domain pattern set of the DMRS is the first time domain pattern set.

2) The first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is less than a first preset value, either configured or pre-configured.

Specifically, the subchannel bandwidth may be a subchannel bandwidth configured or preconfigured in the SL transmission time slot, and the implementation process is similar to that in 1), which is not repeated herein.

The first preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. In step S102, when the first channel bandwidth is smaller than a first preset value, the terminal device determines that the target time domain pattern set of the DMRS is the first time domain pattern set.

Optionally, when the subchannel bandwidth is equal to the first preset value, in step S102, the terminal device may determine that the target time domain pattern set of the DMRS is the first time domain pattern set, or determine that the target time domain pattern set of the DMRS is other time domain pattern sets different from the first time domain pattern set, which may be flexibly configured according to different application scenarios, which is not limited herein.

3) The difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.

Specifically, the second channel bandwidth frequency domain occupied bandwidth of the PSCCH may be preconfigured in the configuration information of the resource pool, and the implementation process is similar to that in 1), which is not repeated here.

The second preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. In step S102, when the first channel bandwidth is smaller than a first preset value, the terminal device determines that the target time domain pattern set of the DMRS is the first time domain pattern set.

Optionally, when the difference between the first channel bandwidth and the second channel bandwidth is equal to the second preset value, in step S102, the terminal device may determine that the target time domain pattern set of the DMRS is the first time domain pattern set, or determine that the target time domain pattern set of the DMRS is another time domain pattern set different from the first time domain pattern set, which may be flexibly configured according to different application scenarios, which is not limited herein.

Specifically, when at least one of the above 1), 2), and 3) is satisfied, the terminal device determines that the target time domain pattern set of the DMRS is the first time domain pattern set. Otherwise, when any of the above 1), 2), and 3) is not satisfied, the terminal device may determine that the target time domain pattern set of the DMRS is another time domain pattern set different from the first time domain pattern set, for example, may be the second time domain pattern set or another time domain pattern set, which is not limited herein.

The implementation of the first set of time domain patterns is described below.

In one possible implementation manner, in the first time domain pattern set, there may be no time domain overlapping between the first time domain position carrying the DMRS and the second time domain position carrying the PSCCH, that is, the PSSCH carrying the DMRS does not multiplex the time-frequency resources occupied by the PSCCH, so that the problem of incomplete DMRS bearing in the case that the PSSCH carrying the DMRS multiplexes the time-frequency resources occupied by the PSCCH can be avoided. Meanwhile, the problem of time domain filtering complexity of DMRS channel estimation caused by different numbers of DMRS symbols and different time domain positions on different frequency bands can be avoided.

Optionally, the firstOne implementation of a set of time domain patterns may include the "DM-RS position" as shown in Table 2

Any one or more of the implementations.

TABLE 2

In Table 2, "l _d in symbols "denotes the number of symbols carrying the third time domain positions of the PSSCH and PSCCH in the SL transmission slot; "DM-RS position

"indicates a time domain offset of a first symbol (i.e., SL start symbol position startslsymbol) from a first time domain position of a side transmission resource carrying the DMRS, i.e., the time domain position of the DMRS; "PSCCH duration 2 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 2; "PSCCH duration 3 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 3; "Number of PSSCH DM-RS" represents the number of time domain symbols carrying the first time domain position of the DMRS in the SL transmission slot. Wherein in a time division multiplexing (time division multiplexing, TDM) scenario, since both PSSCH and PSCCH are not multiplexed in SL transmission slots, then "l" is _d The value of in symbols may be the sum of the number of symbols carrying the PSSCH and the number of symbols carrying the PSCCH; in a frequency division multiplexing (frequency division multiplexing, FDM) scenario, since there are overlapping symbols in the SL transmission slots for both PSSCH and PSCCH, i.e., both PSSCH and PSCCH are carried on the symbols of the PSSCH, then "l _d The value of in symbols "may be the number of symbols carrying the PSSCH.

In the SL communication process, the terminal device is based on table 2, because the first time domain position carrying any one DMRS and the second time domain position carrying the PSCCH do not have time domain overlapping, namely the PSSCH carrying the DMRS does not multiplex the time-frequency resource occupied by the PSCCH, the problem of incomplete DMRS bearing under the condition that the PSSCH carrying the DMRS multiplexes the time-frequency resource occupied by the PSCCH can be avoided. Meanwhile, the problem of time domain filtering complexity of DMRS channel estimation caused by different numbers of DMRS symbols and different time domain positions on different frequency bands can be avoided.

Alternatively, one implementation of the first set of time domain patterns may include a "DM-RS position" as shown in Table 3

Any one or more of the implementations. In table 3, the definition of each parameter is the same as that of table 2, and will not be repeated here.

TABLE 3 Table 3

In the SL communication process, the terminal device does not have the time domain overlapping condition of the first time domain position of part of the bearing DMRS (Number of PSSCH DM-RS takes the value of 2) and the second time domain position of the bearing PSCCH, namely, the PSSCH bearing the DMRS does not multiplex the time-frequency resource occupied by the PSCCH, so that the problem of incomplete bearing of the DMRS can be avoided. Meanwhile, the problem of time domain filtering complexity of DMRS channel estimation caused by different numbers of DMRS symbols and different time domain positions on different frequency bands can be avoided.

Further, for the case that the time domain overlaps with the symbol 1 in both the first time domain position of the partial bearer DMRS (Number of PSSCH DM-RS takes a value of 3 or 4) and the second time domain position of the bearer PSCCH. At this time, DMRS is not mapped on symbol 1, and one symbol following symbol 1 is the first PSSCH DMRS symbol, that is, "4" in "1,4,7" in the table is the first PSSCH DMRS symbol, or "5" in "1,5,9" in the table is the first PSSCH DMRS symbol, or "6" in "1,6, 11" in the table is the first PSSCH DMRS symbol, or "4" in "1,4,7,10" in the table is the first PSSCH DMRS symbol.

Alternatively, one implementation of the first set of time domain patterns may include a "DM-RS position" as shown in Table 4

Any one or more of the implementations. In table 4, the definition of each parameter is the same as that of table 2, and will not be repeated here.

In order to avoid the situation that the time domain of the first time domain position of part of the carrier DMRS (Number of PSSCH DM-RS takes a value of 3 or 4) and the second time domain position of the carrier PSCCH overlap with the symbol 1, the implementation based on table 3 deletes the situation that the symbol takes a value of "1". At this time, in the SL communication process, the terminal device based on table 4, because there is no time domain overlapping between the first time domain position carrying any DMRS and the second time domain position carrying the PSCCH, that is, the PSSCH carrying the DMRS does not multiplex the time-frequency resource occupied by the PSCCH, the problem that the DMRS carries incompletely in the case that the PSSCH carrying the DMRS multiplexes the time-frequency resource occupied by the PSCCH can be avoided. Meanwhile, the problem of time domain filtering complexity of DMRS channel estimation caused by different numbers of DMRS symbols and different time domain positions on different frequency bands can be avoided.

TABLE 4 Table 4

Alternatively, one implementation of the first set of time domain patterns may include a "DM-RS position" as shown in Table 5

Any one or more of the implementations. In Table 5, the parameters are setThe meaning is the same as that of table 2, and will not be described again here.

TABLE 5

Consider in tables 3 and 4, at l _d Under the configuration that in symbols are 9,10, 11, 12 and 13, when Number of PSSCH DM-RS is 2 or 3, the number of equivalent symbols of PSSCH DMRS is 2. And the number of symbols for the equivalent maximum PSSCH DMRS configuration is 3, i.e., 4 columns PSSCH DMRS mapping is not supported. To solve the above problem, the validity of the PSSCH DMRS configuration is increased, and another implementation of the first time domain pattern set is shown in table 5.

Alternatively, the four columns PSSCH DMRS symbol designs may be {4,6,9,10}, {3,5,8,11}, or other implementations, not limited herein, other than {3,5,8,10}, {4,6,9,11}, as shown in Table 5.

In summary, when the target time domain pattern set of the DMRS is the first time domain pattern set, the first time domain pattern set is a different resource mapping manner from table 1, and is mainly represented by symbol 1 or no mapping PSSCH DMRS on the OFDM symbol carrying PSCCH.

2. When the first channel bandwidth obtained in step S101 meets at least one of the following, determining that the target time domain pattern set of the DMRS is the second time domain pattern set includes:

1) The first channel bandwidth is n sub-channel bandwidths, n being a positive integer greater than 1.

Specifically, the subchannel bandwidths may be configured or preconfigured subchannel bandwidths in SL transmission time slots, and the configured or preconfigured subchannel bandwidths may be configured in configuration information of a resource pool. In step S102, when the first channel bandwidth is n configured or preconfigured subchannel bandwidths (n is a positive integer greater than 1), the terminal device may determine that the target time domain pattern set of the DMRS is the second time domain pattern set.

2) The first channel bandwidth is greater than a third preset value, either configured or preconfigured.

The third preset value may specifically be associated with a preset bandwidth of PRBs, for example, the third preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. In step S102, when the first channel bandwidth is greater than a third preset value, the terminal device determines that the target time domain pattern set of the DMRS is the second time domain pattern set.

Optionally, when the first channel bandwidth is equal to the third preset value, in step S102, the terminal device may determine that the target time domain pattern set of the DMRS is the second time domain pattern set, or determine that the target time domain pattern set of the DMRS is other time domain pattern sets different from the second time domain pattern set, which may be flexibly configured according to different application scenarios, which is not limited herein.

3) The difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.

Specifically, the second channel bandwidth frequency domain occupied bandwidth of the PSCCH may also be preconfigured in the configuration information of the resource pool, for example, determined by "frequency domain resource (frequency resource scch)" of the PSCCH in the configuration information of the resource pool. In step S102, when the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value, the terminal device may determine that the target time-domain pattern set of the DMRS is the second time-domain pattern set.

Optionally, when the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is equal to the fourth preset value, in step S102, the terminal device may determine that the target time domain pattern set of the DMRS is the second time domain pattern set, or determine that the target time domain pattern set of the DMRS is another time domain pattern set, for example, may be the first time domain pattern set or another time domain pattern set, and may be flexibly configured according to different application scenarios, which is not limited herein.

The fourth preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. In step S102, when the first channel bandwidth is greater than a fourth preset value, the terminal device determines that the target time domain pattern set of the DMRS is the second time domain pattern set.

Specifically, when at least one of the above 1), 2), and 3) is satisfied, the terminal device may determine that the target time domain pattern set of the DMRS is the second time domain pattern set, where the second time domain pattern set may specifically refer to the implementation in table 1; otherwise, when any of the above 1), 2), and 3) is not satisfied, the terminal device may determine that the target time domain pattern set of the DMRS is another time domain pattern set different from the second time domain pattern set, for example, may be the first time domain pattern set or another time domain pattern set, which is not limited herein.

S103, determining the first time domain position of the DMRS according to the target time domain pattern set.

In this embodiment, in step S103, the terminal device determines the first time domain position of the DMRS according to the target time domain pattern set obtained in step S102.

The target time domain pattern set may be configured or preconfigured in the terminal device, and multiple different time domain pattern sets may be included in the target time domain pattern set. After determining in step S102 that one of the target time-domain pattern sets is used to designate the time-domain pattern set (e.g., the first time-domain pattern set or the second time-domain pattern set), the terminal device determines in step S103 the first time-domain position of the DMRS using the designated time-domain pattern set.

After determining the first time domain position of the DMRS in step S103, when the terminal device is used as a receiving device of the SL system, the terminal device may obtain the DMRS according to the first time domain position of the DMRS in the SL transmission time slot, and further analyze the PSSCH in the SL transmission time slot according to the DMRS. For example, the terminal device may parse the data information, the second control information, and the like carried by the PSSCH in the SL transmission slot, which is not limited herein.

Further, after determining the first time domain position of the DMRS in step S103, when the terminal device is a transmitting device of the SL system, the terminal device may transmit control information or data information, etc., to other devices in the SL transmission slot according to the first time domain position of the DMRS.

In this embodiment, in the side uplink communication process, the terminal device determines a target time domain pattern set of the DMRS according to the first channel bandwidth of the PSSCH, and further, the terminal device determines a first time domain position of the DMRS according to the target time domain pattern set. The target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, and the first time domain pattern set is different from the second time domain pattern set, that is, the terminal device may determine the first time domain position of the DMRS in at least two different time domain pattern sets according to the difference of the first channel bandwidths of the PSSCH. Therefore, in the side-link communication process, the flexible configuration of the DMRS is provided, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, so that the communication efficiency of the side-link is improved.

Fig. 8 is a schematic diagram of another side-link communication method according to an embodiment of the present application, and as shown in fig. 8, the side-link communication method includes the following steps.

S201, determining a first channel bandwidth of a side uplink physical layer shared channel PSSCH;

in this embodiment, during the SL transmission, the terminal device determines in step S101 that the channel bandwidth of the PSSCH in the SL transmission slot is the first channel bandwidth.

The implementation process of step S201 is similar to the implementation process of step S101, and will not be described herein.

S202, determining the number of reference symbols of the PSSCH according to the first channel bandwidth;

in this embodiment, the terminal device determines the number of reference symbols of the PSSCH according to the first channel bandwidth, where the number of reference symbols of the PSSCH may have different values, and determines the number of reference symbols of the corresponding PSSCH according to the difference of the first channel bandwidth.

In a possible implementation manner, in step S202, the terminal device may determine the number of reference symbols of the PSSCH in different manners according to the different determination of the first channel bandwidth obtained in step S201, and the different manners are described below as a first manner and a second manner, respectively.

1. When the first channel bandwidth obtained in step S201 meets at least one of the following, determining the number of reference symbols of the PSSCH according to the first mode includes:

1) The first channel bandwidth is a configured or pre-configured sub-channel bandwidth and the configured or pre-configured sub-channel bandwidth is equal to the second channel bandwidth of the side-uplink physical layer control channel PSCCH.

Specifically, the subchannel bandwidths may be configured or preconfigured subchannel bandwidths in SL transmission time slots, and the configured or preconfigured subchannel bandwidths may be configured in configuration information of a resource pool. The second channel bandwidth frequency domain occupied bandwidth of the PSCCH may also be preconfigured in the configuration information of the resource pool, for example, determined by "frequency domain resource (frequency resource scch)" of the PSCCH in the configuration information of the resource pool. In step S202, when the first channel bandwidth is a configured or preconfigured subchannel bandwidth and the configured or preconfigured subchannel bandwidth is equal to the second channel bandwidth of the PSCCH, the terminal device determines the number of reference symbols of the PSCCH according to the first mode.

Specifically, the sub-channel bandwidth may be a preset sub-channel bandwidth in the SL transmission slot, and the implementation process is similar to that in 1), which is not described herein.

The first preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. In step S202, when the first channel bandwidth is smaller than a first preset value, the terminal device determines the number of reference symbols of the PSSCH according to a first mode.

Optionally, when the sub-channel bandwidth is equal to the first preset value, in step S202, the terminal device may determine the reference symbol length of the PSSCH according to the first mode, or determine the reference symbol length of the PSSCH according to other modes, for example, may be in the second mode or in other modes, and may be flexibly configured according to different application scenarios, which is not limited herein.

The second preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. In step S202, when the first channel bandwidth is smaller than a first preset value, the terminal device determines the number of reference symbols of the PSSCH according to a first mode.

Optionally, when the difference between the first channel bandwidth and the second channel bandwidth is equal to the second preset value, in step S202, the terminal device may determine the reference symbol length of the PSSCH according to the first mode, or determine the reference symbol length of the PSSCH according to another mode, for example, may be in the second mode or in another mode, and may be flexibly configured according to different application scenarios, which is not limited herein.

Wherein, when at least one of modes 1), 2) and 3) is satisfied, the terminal device determines the number of reference symbols of the PSSCH according to the first mode in step S202; otherwise, when any one of the above 1), 2), and 3) is not satisfied, the terminal device determines the reference symbol length of the PSSCH in step S202 according to other manners, for example, the reference symbol length may be in the second manner or in other manners, and may be flexibly configured according to different application scenarios, which is not limited herein.

In one possible implementation method of the first mode, the number of reference symbols of the PSSCH is determined by the number of side uplink SL transmission symbols, length slsymbol, and a target parameter, where the target parameter includes at least one of the following:

the number of symbols bearing the second time domain position of the PSCCH is expressed by timeResourcePSCH; or alternatively, the first and second heat exchangers may be,

the number of symbols of the GAP in the sidelink transmission time slot is represented by n_gap; or alternatively, the first and second heat exchangers may be,

the number of symbols of automatic gain control (automatic gain control, AGC) in the sidelink transmission slot, denoted n_agc; or alternatively, the first and second heat exchangers may be,

the number of symbols of the physical direct link feedback channel (physical sidelink feedback channel, PSFCH) in the sidelink transmission slot is denoted as n_syml_psfch.

The number of symbols of the GAP in the sidelink transmission slot may be 1, or other values, such as 2,3, etc., which are not limited herein. Similarly, the number of symbols of the AGC in the side transmission timeslot may be 1, or other values, such as 2,3, etc., which are not limited herein.

Specifically, the number of reference symbols of the PSSCH is determined by the number of side uplink SL transmission symbols, length hlslsymbol, and the target parameter, and the implementation process may specifically be: the reference symbol number of the PSSCH is the difference between the SL transmission symbol number and the target parameter.

Exemplary, reference symbol number of PSSCH is l _d The implementation procedure for determining the number of reference symbols of the PSSCH according to the first mode in step S202 may be implemented as follows:

l _d =length slsymbol-timeresource scch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-n_gap; or alternatively, the first and second heat exchangers may be,

l _d =length symbols-n_agc; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbs-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_gap; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_agc; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-n_gap-n_agc; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-n_gap-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbols-n_agc-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_gap-n_agc; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_gap-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-timeresource scch-n_agc-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d =length slsymbol-n_gap-n_agc-n_syml_psfch; or alternatively, the first and second heat exchangers may be,

l _d ＝lengthSLsymbols-timeResourcePSCCH-N_GAP-N_AGC-N_syml_PSFCH。

in the above implementations, the number of symbols of the GAP interval GAP in the sidelink transmission slot may be 1, or other values, such as 2,3, etc., which are not limited herein. Similarly, the number of symbols of the AGC in the side transmission timeslot may be 1, or other values, such as 2,3, etc., which are not limited herein.

2. When the first channel bandwidth obtained in step S201 meets at least one of the following, determining the number of reference symbols of the PSSCH according to the second mode includes:

Specifically, the subchannel bandwidths may be configured or preconfigured subchannel bandwidths in SL transmission time slots, and the configured or preconfigured subchannel bandwidths may be configured in configuration information of a resource pool. In step S202, when the first channel bandwidth is n configured or preconfigured subchannel bandwidths (n is a positive integer greater than 1), the terminal device may determine the number of reference symbols of the PSSCH according to the second manner.

The third preset value may specifically be associated with a preset bandwidth of PRBs, for example, the third preset value may be a preset bandwidth of 20 PRBs, or a preset bandwidth of 30 PRBs, or other values. In step S202, when the first channel bandwidth is greater than a third preset value, the terminal device determines the number of reference symbols of the PSSCH according to the second manner.

Optionally, when the first channel bandwidth is equal to the third preset value, in step S202, the terminal device may determine the number of reference symbols of the PSSCH according to the second mode, or determine the reference symbol length of the PSSCH according to other modes, for example, may be in the first mode or in other modes, and may be flexibly configured according to different application scenarios, which is not limited herein.

Specifically, the second channel bandwidth frequency domain occupied bandwidth of the PSCCH may also be preconfigured in the configuration information of the resource pool, for example, determined by "frequency domain resource (frequency resource scch)" of the PSCCH in the configuration information of the resource pool. In step S102, when the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a fourth preset value, the terminal device determines the number of reference symbols of the PSCCH according to a second mode.

Optionally, when the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is equal to the fourth preset value, in step S202, the terminal device may determine the reference symbol length of the PSCCH according to the second mode, or determine the reference symbol length of the PSCCH according to other modes, for example, the reference symbol length may be configured flexibly according to different application scenarios, which is not limited herein.

The fourth preset value may specifically be associated with a preset bandwidth of PRBs, for example, the first preset value may be a preset bandwidth of k PRBs, where k is any integer of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, for example, k takes a value of 3, or other values. In step S102, when the first channel bandwidth is greater than the fourth preset value, the terminal device may determine the number of reference symbols of the PSSCH according to other manners, for example, the first manner or other manners, which are not limited herein.

Specifically, when at least one of the above 1), 2), and 3) is satisfied, the terminal device determines the number of reference symbols of the PSSCH according to the second manner in step S202. Otherwise, when any one of the above 1), 2), and 3) is not satisfied, the terminal device determines the reference symbol length of the PSSCH in step S202 according to other manners, for example, the reference symbol length may be a first manner or another manner, and may be flexibly configured according to different application scenarios, which is not limited herein.

In a possible implementation manner of the second aspect, the number of reference symbols of the PSSCH is determined by the number of side uplink SL transmission symbols, length slsymbol, and a target parameter, where the target parameter includes at least one of the following:

l _d ＝lengthSLsymbols-N_GAP-N_AGC-N_syml_PSFCH。

S203, determining a first time domain position of the DMRS according to the time domain pattern set of the demodulation reference signal DMRS and the reference symbol number.

In this embodiment, the terminal device determines, in step S203, the first time domain position of the DMRS according to the time domain pattern set of the DMRS and the number of reference symbols obtained in step S202.

In one possible implementation, the target time domain pattern set includes a mapping relationship between the first time domain position and a preset parameter, where the preset parameter may include a number of reference symbols of the PSSCH, a number of symbols of the first time domain position, and a number of symbols of a second time domain position carrying a PSCCH. The terminal device may determine the first time domain positions corresponding to different DMRS according to different preset parameters, so that the first time domain positions of the DMRS are associated with implementation of the preset parameters. The terminal equipment can flexibly work under different preset parameters and different frame structures, and the communication efficiency of the side uplink is further improved.

Alternatively, one implementation of the first set of time domain patterns may include a "DM-RS position" as shown in Table 6

Any one or more of the implementations.

TABLE 6

In Table 6, "l _d in symbols "represents the number of reference symbols; "PSCCH duration 2 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 2; "PSCCH duration 3 symbols" means that the number of symbols carrying the second time domain position of the PSCCH is 3; "Number of PSSCH DM-RS" represents the number of time domain symbols carrying the first time domain position of the DMRS in the SL transmission slot. For the "DM-RS position

"is implemented in association with the first mode and the second mode in step S202, respectively, as described below.

1. In the first mode, the first time domain position of the DMRS, namely the DM-RS position

", is when the DMRS is used for SL transmissionThe time domain offset in the slot relative to the first symbol determined by the SL start symbol positions startslsymbol and the time resource scch of the PSSCH, where startslsymbol represents the start symbol position of the SL transmission slot and timeresource scch represents the number of symbols carrying the second time domain position of the PSCCH. The startslsymbol and timeresourceps scch may be configured or preconfigured values in the SL transmission time slot, so that the first time domain position of the DMRS accords with a preset logic rule in the SL transmission time slot, and the method and the device are applicable to more application scenarios and promote the feasibility of the scheme.

Specifically, in the implementation process that the first symbol is determined by the SL start symbol positions startslsymbol and the time resource scch of the PSSCH, the time domain index of the first symbol may be the sum of the startslsymbol and the time resource scch, i.e., the physical time domain position of the DMRS is determined by the DMRS first time domain position offset startslsymbol+time resource scch.

2. In the second mode, the first time domain position of the DMRS, namely the DM-RS position

The "time domain offset of the DMRS in the SL transmission slot relative to the SL start symbol position startslsymbol, where startslsymbol represents the start symbol position of the SL transmission slot, i.e., the physical time domain position of the DMRS is determined for the first time domain position offset startslsymbol of the DMRS. The startslsymbol may be a configured or preconfigured value in the SL transmission time slot, so that the first time domain position of the DMRS accords with a preset logic rule in the SL transmission time slot, and the startslsymbol may be suitable for more application scenarios, thereby improving the feasibility of the scheme.

In this embodiment, in the side uplink communication process, the terminal device determines the number of reference symbols of the PSSCH according to the first channel bandwidth of the PSSCH, that is, the terminal device may determine the number of reference signals of different PSSCHs according to the difference of the first channel bandwidths, and the first channel bandwidths of the different PSSCHs may determine the number of reference symbols of different PSSCHs. And then, the terminal equipment determines the first time domain position of the DMRS according to the reference symbol number in the time domain pattern set of the DMRS, so that the terminal equipment can flexibly configure the DMRS according to different reference symbol numbers of the PSSCH, and meanwhile, the terminal equipment can flexibly work under different frame structures corresponding to different channel bandwidths, and the communication efficiency of the side uplink is improved.

The embodiments of the present application are described above in terms of methods, and the communications device in the embodiments of the present application is described below in terms of implementation of a specific device.

Referring to fig. 9, an embodiment of the present application provides a schematic diagram of a communication device 900, where the communication device 900 at least includes a processing unit 901 and a possible transceiver unit 902.

The communication device 900, in one possible implementation, includes:

the processing unit 901 is configured to determine a first channel bandwidth of a side downlink physical layer shared channel PSSCH;

the processing unit 901 is further configured to determine a target time domain pattern set of a demodulation reference signal DMRS according to the first channel bandwidth, where the DMRS is carried on the PSSCH, and the target time domain pattern set includes a first time domain pattern set or a second time domain pattern set, and the first time domain pattern set is different from the second time domain pattern set;

the processing unit 901 is further configured to determine a first time domain location of the DMRS according to the target time domain pattern set.

In one possible implementation, the processing unit 901 is specifically configured to:

In one possible implementation, the first preset value includes a bandwidth of 20 physical resource blocks PRBs.

In one possible implementation, the second preset value is 3 PRBs.

In one possible implementation, in the first set of time domain patterns, there is no time domain overlap of the first time domain position with a second time domain position carrying the PSCCH.

In one possible implementation, the third preset value includes a bandwidth of 20 physical resource blocks PRBs.

In one possible implementation, the fourth preset value is 3 PRBs.

In one possible implementation, the set of target time domain patterns includes a mapping relationship between the first time domain position and a target parameter;

In a possible implementation manner, the apparatus further includes a transceiver unit 902:

the transceiver unit 902 is configured to receive a sidestream control information SCI message, where the SCI message is used to determine the first channel bandwidth; and/or the number of the groups of groups,

the transceiver unit 902 is configured to receive radio resource configuration information, where the configuration information is used to determine the first channel bandwidth.

It should be noted that, for details of the information execution process of the unit of the communication device 900, reference may be specifically made to the description in the method embodiment (for example, the embodiment shown in fig. 7) described in the foregoing application, and details are not repeated here.

The communication device 900, in one possible implementation, includes:

the processing unit 901 is further configured to determine a number of reference symbols of the PSSCH according to the first channel bandwidth;

the processing unit 901 is further configured to determine a first time domain location of a demodulation reference signal DMRS according to the time domain pattern set of the DMRS and the number of reference symbols.

In one possible implementation, the second preset value is 3 PRBs.

In one possible implementation manner, in the first manner, the reference symbol number of the PSSCH is determined by a side-link SL transmission symbol number of a length slsymbol and a target parameter, where the target parameter includes at least one of the following:

the number of symbols of the PSFCH in the sidelink transmission slot.

In one possible implementation, the determining the reference symbol number of the PSSCH by the side-link SL transmission symbol number of length slsymbol and the target parameter includes:

In one possible implementation, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a first symbol, where the first symbol is determined by a SL start symbol position startSLsymbols and a time resource scch of the PSSCH, where the startslsymbol represents the start symbol position of the SL transmission slot and the time resource scch represents a number of symbols carrying the second time domain position of the PSCCH.

In one possible implementation, the determining the target number of symbols associated with the PSSCH based on the first channel bandwidth includes:

In one possible implementation, the fourth preset value is 3 PRBs.

In one possible implementation manner, in the second mode, the number of reference symbols of the PSSCH is determined by the length slsymbol and a target parameter, where the target parameter includes at least one of the following:

the number of symbols of the PSFCH in the sidelink transmission slot.

In one possible implementation, the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a start symbol position startslsymbol, which represents the start symbol position of the SL transmission slot.

In a possible implementation manner, the target time domain pattern set includes a mapping relationship between the first time domain position and a preset parameter;

the transceiver unit 902 is configured to receive a radio resource control RRC message, where the RRC message is used to determine the first channel bandwidth.

It should be noted that, for details of the information execution process of the unit of the communication device 900, reference may be specifically made to the description in the method embodiment (for example, the embodiment shown in fig. 8) described in the foregoing application, and details are not repeated here.

Referring to fig. 10, a possible schematic diagram of a communication device 1000 according to the foregoing embodiment provided in the embodiments of the present application, where the communication device 1000 may specifically be a communication device according to the foregoing embodiment, and the communication device 1000 may include, but is not limited to, a processor 1001, a communication port 1002, a memory 1003, and a bus 1004, and in the embodiments of the present application, the processor 1001 is configured to perform control processing on an action of the communication device 1000.

Further, the processor 1001 may be a central processor unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

It should be noted that the communication device shown in fig. 10 may be specifically used to implement the functions of the steps performed by the communication device in the embodiment of the method corresponding to fig. 7 to 8, and implement the technical effects corresponding to the communication device. The specific implementation of the communication device shown in fig. 10 may refer to the descriptions in the respective method embodiments corresponding to fig. 7 to 8, and will not be described in detail herein.

Embodiments of the present application also provide a computer readable storage medium storing one or more computer executable instructions, where when the computer executable instructions are executed by a processor, the processor performs a method as described in a possible implementation manner of the communication device in the foregoing embodiment, where the communication device may specifically be a communication device in an embodiment of a method corresponding to fig. 7 to 8.

The embodiments of the present application further provide a computer program product storing one or more computers, where the computer program product when executed by the processor performs a method of a possible implementation manner of the foregoing communications device, where the communications device may specifically be a communications device in an embodiment of a method corresponding to the foregoing fig. 7 to 8.

The embodiment of the application also provides a chip system, which comprises a processor and is used for supporting the communication device to realize the functions involved in the possible realization mode of the communication device. In one possible design, the system-on-chip may further include a memory to hold the necessary program instructions and data for the communication device. The chip system may be formed by a chip, or may include a chip and other discrete devices, where the communication device may specifically be a communication device in an embodiment of a method corresponding to fig. 7 to fig. 8.

The embodiment of the application also provides a network system architecture, which includes the communication device, and the communication device may specifically be a communication device in the embodiment of the method corresponding to fig. 7 to fig. 8.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Claims

A method of side-link communication, comprising:

determining a first channel bandwidth of a side uplink physical layer shared channel PSSCH;

determining a target time domain pattern set of a demodulation reference signal (DMRS) according to the first channel bandwidth, wherein the DMRS is borne on the PSSCH, and the target time domain pattern set comprises a first time domain pattern set or a second time domain pattern set;

and determining the first time domain position of the DMRS according to the target time domain pattern set.
The method of claim 1, wherein the determining the target set of time domain patterns for the DMRS based on the first channel bandwidth comprises:

determining that the target set of time domain patterns for the DMRS includes the first set of time domain patterns when the first channel bandwidth meets at least one of:

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is equal to a second channel bandwidth of a side-uplink physical layer control channel PSCCH; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is smaller than a configured or preconfigured first preset value; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.
The method of claim 2, wherein in the first set of time domain patterns, there is no time domain overlap of the first time domain position with a second time domain position carrying the PSCCH.
The method of any of claims 1-3, wherein the determining the target set of time domain patterns for the DMRS from the first channel bandwidth comprises:

determining that the target set of time domain patterns for the DMRS includes the second set of time domain patterns when the first channel bandwidth meets at least one of:

the first channel bandwidth is n sub-channel bandwidths, and n is a positive integer greater than 1; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is greater than a third preset value configured or preconfigured; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.
The method according to any of claims 1 to 4, wherein the set of target time domain patterns comprises a mapping relationship between the first time domain position and a target parameter;

the target parameters include a number of symbols for the first time domain position, a number of symbols for a second time domain position carrying the PSCCH, and a number of symbols for a third time domain position carrying the PSCCH and the PSCCH.
A method of side-link communication, comprising:

determining a first channel bandwidth of a side uplink physical layer shared channel PSSCH;

determining the reference symbol number of the PSSCH according to the first channel bandwidth;

and determining the first time domain position of the DMRS according to the time domain pattern set of the demodulation reference signal (DMRS) and the reference symbol number.
The method of claim 6, wherein the determining the number of reference symbols of the PSSCH from the first channel bandwidth comprises:

determining the number of reference symbols of the PSSCH according to a first manner when the first channel bandwidth satisfies at least one of:

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is equal to a second channel bandwidth of a side-uplink physical layer control channel PSCCH; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is smaller than a configured or preconfigured first preset value; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.
The method of claim 7, wherein in the first manner, the number of reference symbols of the PSSCH is determined by a side-link SL transmission symbol number, lengslsymbol, and a target parameter, the target parameter comprising at least one of:

The number of symbols carrying the second time domain position of the PSCCH, or,

the number of symbols of the GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the symbol number of the automatic gain control AGC in the side transmission time slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the physical direct link feedback channel PSFCH in the sidelink transmission slot.
The method of claim 7 or 8, wherein the first time domain position of the DMRS is a time domain offset of the DMRS in the SL transmission slot relative to a first symbol determined by a SL start symbol position startslsymbol and a time resource scch of the PSSCH, wherein the startslsymbol represents the start symbol position of the SL transmission slot and the time resource scch represents a number of symbols carrying the second time domain position of the PSCCH.
The method according to any one of claims 6 to 9, wherein said determining a target number of symbols associated with said PSSCH from said first channel bandwidth comprises:

determining the number of reference symbols of the PSSCH according to a second manner when the first channel bandwidth meets at least one of:

the first channel bandwidth is n sub-channel bandwidths, and n is a positive integer greater than 1; or alternatively, the first and second heat exchangers may be,

The first channel bandwidth is greater than a third preset value configured or preconfigured; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.
The method of claim 10, wherein in the second manner, the number of reference symbols of the PSSCH is determined by a length slsymbol and a target parameter, the target parameter comprising at least one of:

the number of symbols of GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of AGC symbols in the side transmission time slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the PSFCH in the sidelink transmission slot.
The method of claim 10 or 11 wherein the first time domain position of the DMRS is a time domain offset of the DMRS in a SL transmission slot relative to a SL start symbol position startslsymbol, the startslsymbol representing a start symbol position of the SL transmission slot.
The method according to any of claims 6 to 12, wherein the set of target time domain patterns comprises a mapping relationship between the first time domain position and a preset parameter;

the preset parameters include the number of reference symbols of the PSSCH, the number of symbols of the first time domain position, and the number of symbols of the second time domain position carrying the PSCCH.
A side-link communication device comprising a processing unit;

the processing unit is configured to determine a first channel bandwidth of a side downlink physical layer shared channel PSSCH;

the processing unit is further configured to determine a target time domain pattern set of a demodulation reference signal DMRS according to the first channel bandwidth, where the DMRS is carried on the PSSCH, and the target time domain pattern set includes a first time domain pattern set or a second time domain pattern set;

the processing unit is further configured to determine a first time domain position of the DMRS according to the target time domain pattern set.
The apparatus according to claim 14, wherein the processing unit is specifically configured to:

determining that the target set of time domain patterns for the DMRS includes the first set of time domain patterns when the first channel bandwidth meets at least one of:

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is equal to a second channel bandwidth of a side-uplink physical layer control channel PSCCH; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is smaller than a configured or preconfigured first preset value; or alternatively, the first and second heat exchangers may be,

The difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.
The apparatus of claim 15, wherein in the first set of time domain patterns, there is no time domain overlap of the first time domain position with a second time domain position carrying the PSCCH.
The apparatus according to any one of claims 14 to 16, wherein the processing unit is specifically configured to:

determining that the target set of time domain patterns for the DMRS includes the second set of time domain patterns when the first channel bandwidth meets at least one of:

the first channel bandwidth is n sub-channel bandwidths, and n is a positive integer greater than 1; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is greater than a third preset value configured or preconfigured; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.
The apparatus according to any of claims 14 to 17, wherein the set of target time domain patterns comprises a mapping relationship between the first time domain position and a target parameter;

the target parameters include a number of symbols for the first time domain position, a number of symbols for a second time domain position carrying the PSCCH, and a number of symbols for a third time domain position carrying the PSCCH and the PSCCH.
A side-link communication apparatus, comprising a processing unit:

the processing unit is configured to determine a first channel bandwidth of a side downlink physical layer shared channel PSSCH;

the processing unit is further configured to determine a number of reference symbols of the PSSCH according to the first channel bandwidth;

the processing unit is further configured to determine a first time domain position of a demodulation reference signal DMRS according to the time domain pattern set of the DMRS and the number of reference symbols.
The apparatus according to claim 19, wherein the processing unit is specifically configured to:

determining the number of reference symbols of the PSSCH according to a first manner when the first channel bandwidth satisfies at least one of:

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is equal to a second channel bandwidth of a side-uplink physical layer control channel PSCCH; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is a sub-channel bandwidth, and the sub-channel bandwidth is smaller than a configured or preconfigured first preset value; or alternatively, the first and second heat exchangers may be,

the difference between the first channel bandwidth and the second channel bandwidth is less than a second preset value, either configured or preconfigured.
The apparatus of claim 20, wherein in the first manner, the number of reference symbols of the PSSCH is determined by a side-link SL transmission symbol number, lengslsymbol, and a target parameter, the target parameter comprising at least one of:

The number of symbols carrying the second time domain position of the PSCCH, or,

the number of symbols of GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of AGC symbols in the side transmission time slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the PSFCH in the sidelink transmission slot.
The apparatus of claim 20 or 21, wherein the first time domain position of the DMRS is a time domain offset of the DMRS in a SL transmission slot relative to a first symbol determined by a SL start symbol position startslsymbol and a time resource scch of a PSSCH, wherein the startslsymbol represents a start symbol position of the SL transmission slot and the time resource scch represents a number of symbols carrying a second time domain position of the PSCCH.
The apparatus of any of claims 19 to 22, wherein the determining the target number of symbols associated with the PSSCH from the first channel bandwidth comprises:

determining the number of reference symbols of the PSSCH according to a second manner when the first channel bandwidth meets at least one of:

the first channel bandwidth is n sub-channel bandwidths, and n is a positive integer greater than 1; or alternatively, the first and second heat exchangers may be,

the first channel bandwidth is greater than a third preset value configured or preconfigured; or alternatively, the first and second heat exchangers may be,

The difference between the first channel bandwidth and the second channel bandwidth of the PSCCH is greater than a configured or preconfigured fourth preset value.
The apparatus of claim 23, wherein in the second manner, the number of reference symbols of the PSSCH is determined by length slsymbol and a target parameter, the target parameter comprising at least one of:

the number of symbols of GAP in the sidelink transmission slot; or alternatively, the first and second heat exchangers may be,

the number of AGC symbols in the side transmission time slot; or alternatively, the first and second heat exchangers may be,

the number of symbols of the PSFCH in the sidelink transmission slot.
The apparatus of claim 23 or 24 wherein the first time domain position of the DMRS is a time domain offset of the DMRS in a SL transmission slot relative to a SL start symbol position startslsymbol, the startslsymbol representing a start symbol position of the SL transmission slot.
The apparatus according to any one of claims 19 to 25, wherein the set of target time domain patterns comprises a mapping relationship between the first time domain position and a preset parameter;

the preset parameters include the number of reference symbols of the PSSCH, the number of symbols of the first time domain position, and the number of symbols of the second time domain position carrying the PSCCH.
A communication device, characterized in that the device comprises a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method according to any one of claims 1 to 5 or to cause the device to perform the method according to any one of claims 6 to 13.
A computer readable storage medium having instructions stored thereon which, when executed by a computer, implement the method of any of claims 1 to 5 or the method of any of claims 6 to 13.