CN111836368A

CN111836368A - Method and device for data transmission

Info

Publication number: CN111836368A
Application number: CN201910305552.6A
Authority: CN
Inventors: 刘显达; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-16
Filing date: 2019-04-16
Publication date: 2020-10-27
Also published as: WO2020211767A1

Abstract

The application provides a method and a device for data transmission. The method comprises the following steps: determining a first time-frequency resource set and at least one second time-frequency resource set, wherein the remaining time-frequency resource sets are used for mapping first data and at least one second data, and are time-frequency resource sets except the first time-frequency resource set and the at least one second time-frequency resource set in a preset time-frequency resource set, wherein the first time-frequency resource set is used for bearing a first PTRS (packet transport reference signal), the second time-frequency resource set is used for bearing a second PTRS (packet transport reference signal), the first PTRS is used for demodulating the first data, and the second PTRS is used for demodulating the second data; the first data and the at least one second data are transmitted. According to the technical scheme, the time-frequency resource set which can not map the data is determined in advance on the time-frequency resource set which bears the data, so that the situation that the terminal equipment determines the time-frequency resource set which can not map the data based on a plurality of DCIs is avoided, and the data receiving performance is improved.

Description

Method and device for data transmission

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for data transmission.

Background

In the third generation partnership project (3 GPP) long term evolution advanced (LTE-a), a coordinated multi-point (CoMP) technology utilizes cooperation among a plurality of network devices separated from each other in a geographical location to communicate with a User Equipment (UE), so as to reduce interference of the UE at a cell edge, improve throughput (cell throughput), and improve reliability.

When a plurality of network devices (for example, referred to as network device # a and network device # B) transmit data to a terminal device, in order to ensure demodulation performance of the data, the plurality of network devices may respectively transmit a Phase Tracking Reference Signal (PTRS) to the terminal device for demodulating channels transmitted by the plurality of network devices.

In the prior art, a terminal device determines a time-frequency resource set position for demodulating data carried by a Physical Downlink Shared Channel (PDSCH) sent by different network devices, based on Downlink Control Information (DCI) sent by a plurality of network devices (e.g., network device # a and network device # B). However, when the terminal device receives a plurality of DCIs, in order to accurately know the time-frequency resource set positions of data mapping carried by the PDSCH respectively scheduled by the plurality of DCIs, the terminal device needs to comprehensively determine the time-frequency resource set position of data mapping carried by each PDSCH by combining the time-frequency resource set indication information carried in the plurality of DCIs after receiving the plurality of DCIs, for example, the PDSCH 1 scheduled by the DCI 1 needs to determine that the PDSCH 1 cannot be mapped on the corresponding time-frequency resource according to the non-zero power (NZP) PTRS scheduled by the DCI 2, which may result in reducing the data reception performance. Therefore, how to improve the data receiving performance becomes an urgent problem to be solved.

Disclosure of Invention

The application provides a method and a device for data transmission, which can avoid that terminal equipment determines a time-frequency resource set which can not map data based on a plurality of DCIs by predetermining the time-frequency resource set which can not map the data on the time-frequency resource set which bears the data, and improve the receiving performance of the data.

In a first aspect, a method for data transmission is provided, including: determining a first time-frequency resource set and at least one second time-frequency resource set, wherein the remaining time-frequency resource sets are used for mapping first data and the at least one second data, and are preset time-frequency resource sets except the first time-frequency resource set and the at least one second time-frequency resource set, wherein the first time-frequency resource set is used for bearing a first Phase Tracking Reference Signal (PTRS), the at least one second time-frequency resource set is respectively used for bearing at least one second PTRS, the first PTRS is used for demodulating the first data, and the at least one second PTRS is respectively used for demodulating the at least one second data; transmitting the first data and the at least one second data. Specifically, the time frequency resource carrying the second PTRS may be a subset of the second time frequency resource. The time frequency resource actually carrying the second PTRS is determined according to the indication information of the DCI scheduling the second data, where the indication information may select one of the time frequency resources of the multiple candidate second PTRS, and the second time frequency resource includes the time frequency resources of the multiple candidate second PTRS indicated by the DCI.

According to the method for data transmission provided by the embodiment of the application, the network equipment determines the time frequency resource sets of the PTRSs respectively used for mapping a plurality of data, and determines that the data is not mapped on the time frequency resource sets of the PTRSs.

It is to be understood that the first data and the at least one second data described above are not mapped on the first set of time-frequency resources and the at least one second set of time-frequency resources; or the first data is subjected to rate matching according to the first time-frequency resource set and at least one second time-frequency resource set; or the first time-frequency resource and the at least one second time-frequency resource are rate matching resources of the first data, the base station sends the first data and performs rate matching according to the positions of the first time-frequency resource and the at least one second time-frequency resource, and the terminal equipment receives the first data and performs data reception according to the positions of the first time-frequency resource and the at least one second time-frequency resource.

It is further understood that the above mentioned remaining set of time frequency resources for mapping the first data and the at least one second data may be understood as a part of the remaining set of time frequency resources for mapping the first data and the at least one second data; alternatively, it may be understood that all of the remaining sets of time frequency resources are used for mapping the first data and the at least one second data.

Optionally, the preset time-frequency resource set is determined according to the time-frequency resource position indicated by the DCI scheduling the data; or, the remaining time-frequency resource set is determined directly according to the DCI for scheduling the data. For example, the preset time frequency resource set is determined according to the time frequency resource position indicated by the first DCI for scheduling the first data, or the preset time frequency resource set is determined according to the time frequency resource position indicated by the second DCI for scheduling the second data.

The first data and the at least one second data adopt different transmission ports; or, the first data and the at least one second data correspond to different DMRS ports; or, the first data and the at least one second data are different codewords; or, the first data and the at least one second data are different Transport Blocks (TBs); or, the first data and the at least one second data correspond to different transport layers; or, the spatial filtering information of the first data and the at least one second data are different; or, the first data and the at least one second data occupy the same carrier; or, the first data and the at least one second data occupy the same partial Bandwidth (BWP).

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and transmitting first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

According to the method for data transmission provided by the embodiment of the application, in order to schedule a plurality of data, the network device needs to send a plurality of DCIs to the terminal device receiving the plurality of data.

Optionally, the first DCI is not used for scheduling the second data, and the second DCI is not used for scheduling the first data;

optionally, the first DCI is only used for scheduling first data, and the first DCI is only used for scheduling second data.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; or, the control resource set groups corresponding to the first DCI and the second DCI are different; or, the physical downlink control channel configuration parameters corresponding to the first DCI and the second DCI are different; or, the DMRS ports of the demodulation reference signals indicated by the first DCI and the second DCI belong to different Code Division Multiplexing (CDM) groups; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI are located in the same carrier; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP; or, the scrambling code scrambled by the first DCI is different from the scrambling code scrambled by the second DCI; or, the HARQ process group where the HARQ process code indicated by the first DCI is located is different from the HARQ process group where the HARQ process code indicated by the second DCI is located; or, the transmission beam indicated by the first DCI is different from the transmission beam indicated by the second DCI; or, the transmission beam group indicated by the first DCI is different from the transmission beam group indicated by the second DCI; or, a transmission beam or quasi-co-location indication (QCL) corresponding to a control resource set or a control resource set group of the first DCI is different from a transmission beam or quasi-co-location indication (QCL) corresponding to a control resource set or a control resource set group of the second DCI.

With reference to the first aspect, in some implementations of the first aspect, the determining the first set of time-frequency resources and the second set of time-frequency resources corresponding to the second codeword includes: determining the first time-frequency resource set according to preconfigured information, wherein the time domain density of the first time-frequency resource set is determined according to a first Modulation and Coding Scheme (MCS), and the first MCS is indicated by the preconfigured information; or, the preconfiguration information directly indicates the time domain density size of the first set of time frequency resources; determining the frequency domain density of the first set of time-frequency resources according to a first number of Resource Blocks (RBs), wherein the first number of RBs is indicated by the preconfigured information; or, the preconfiguration information directly indicates a frequency domain density size of the first set of time-frequency resources; the preconfiguration information indicating the frequency domain location of the first set of time frequency resources comprises: the preconfiguration information indicates subcarriers occupied by the first set of time-frequency resources within one RB; or, the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources; the preconfiguration information indicates that a time domain starting position of the first set of time and frequency resources is a first time domain starting position, wherein the first time domain starting position is not later than time domain starting positions of the first data and the second data; determining a second time frequency resource set according to the preconfigured information, wherein the time domain density of the second time frequency resource set is determined according to a second MCS, and the second MCS is indicated by the preconfigured information; or, the preconfiguration information directly indicates the time domain density size of the second time frequency resource set; determining the frequency domain density of the second time frequency resource set according to a second RB quantity, wherein the second RB quantity is indicated by the preconfigured information; or, the preconfiguration information directly indicates a frequency domain density size of the second set of time-frequency resources; the preconfiguration information indicating the frequency domain location of the second set of time-frequency resources comprises: the preconfiguration information indicates subcarriers occupied by the second time-frequency resource set in one RB; or the preconfiguration information indicates a DMRS port number associated with the second time frequency resource set, wherein the DMRS port associated with the second time frequency resource set and the DMRS port associated with the first time frequency resource set belong to different CDM groups; the preconfiguration information indicates that the time domain starting position of the second time frequency resource set is the first time domain starting position.

Optionally, the MCS corresponding to the first set of time-frequency resources is determined according to an MCS indicated by DCI for scheduling the first data, where the MCS indicated by DCI is used to determine a modulation and coding scheme of the first data, and meanwhile, the MCS is used to determine a time domain density of a first PTRS of the first data. Further, the MCS may be further configured to simultaneously determine a second time-frequency resource set, or to determine a time-domain density of a second PTRS of the second data, so as to deduce the second time-frequency resource set; or, determining a second time-frequency resource set according to the MCS and the offset value of the MCS number, or to say, determining the time-domain density of a second PTRS of the second data to further deduce the second time-frequency resource set. The offset value may be configured through higher layer signaling.

It should be understood that, the determining the time domain density of the first time-frequency resource set based on the first MCS according to the present application refers to determining the time domain density of the time-frequency resource set according to the first MCS and the first transmission capability value reported by the terminal device. The first transmission capacity value reported by the terminal equipment is used for determining the time domain density of the PTRS corresponding to the first data; similarly, the determining the time domain density of the second time frequency resource set based on the second MCS refers to determining the time domain density of the time frequency resource set according to the second MCS and a third transmission capability value reported by the terminal device. And the third transmission capability value reported by the terminal equipment is used for determining the time domain density of the PTRS corresponding to the second data.

It should be further understood that, the frequency domain density of the first time-frequency resource set according to the present application is determined according to the number of the first resource blocks RB, which means that the frequency domain density of the time-frequency resource set is determined according to the first RB and the second transmission capability value reported by the terminal device. The second transmission capacity value reported by the terminal equipment is used for determining the frequency domain density of the PTRS corresponding to the first data; similarly, the determining the frequency domain density of the second time frequency resource set based on the second RB refers to determining the frequency domain density of the time frequency resource set according to the second RB and a fourth transmission capability value reported by the terminal device. And the fourth transmission capability value reported by the terminal equipment is used for determining the frequency domain density of the PTRS corresponding to the second data.

It should also be understood that the application relates to indicating the frequency domain position of the first set of time-frequency resources by indicating the DMRS port number associated with the first set of time-frequency resources because the subcarriers occupied by the first set of time-frequency resources in one RB can be determined according to the DMRS port number associated with the first set of time-frequency resources; similarly, the frequency domain position of the second time frequency resource set is indicated by indicating the DMRS port number of the demodulation reference signal associated with the second time frequency resource set, because the subcarriers occupied by the second time frequency resource set in one RB can be determined according to the DMRS port number associated with the second time frequency resource set.

It should also be appreciated that determining a first set of time-frequency resources to which the present application relates further comprises: determining RBs occupied by the first set of time-frequency resources, specifically, for the first data, the RBs occupied by the first set of time-frequency resources are RBs occupied by the first data scheduled by the first DCI, and for the second data, the RBs occupied by the first set of time-frequency resources are RBs occupied by the second data scheduled by the second DCI; similarly, determining the second time-frequency resource set according to the present application further includes: and determining the RB occupied by the second time-frequency resource set, specifically, for the first data, the RB occupied by the second time-frequency resource set is the above-mentioned RB occupied by the first data scheduled by the first DCI, and for the second data, the RB occupied by the second time-frequency resource set is the above-mentioned RB occupied by the second data scheduled by the second DCI.

According to the method for data transmission provided by the embodiment of the application, the network device can determine the first time-frequency resource set and the second time-frequency resource set according to the pre-configuration information.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and sending a high-layer signaling, wherein the high-layer signaling is used for indicating the first time-frequency resource set and at least one second time-frequency resource set.

According to the method for data transmission provided in the embodiment of the present application, after determining the first time-frequency resource set and the second time-frequency resource set, the network device may send a high-level signaling to the terminal device to indicate the first time-frequency resource set and the at least one second time-frequency resource set.

With reference to the first aspect, in certain implementations of the first aspect, the indicating the frequency-domain location of the second set of time-frequency resources comprises: determining a first demodulation reference signal (DMRS) port number of the first data according to the first DCI; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1002, or the second time-frequency resource set occupies a subcarrier preset in subcarriers with odd numbers in each RB; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the DMRS port number associated with the second time-frequency resource set is 1000, or the second time-frequency resource set occupies a subcarrier preset in subcarriers with even numbers in each RB; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or the second time-frequency resource set occupies a subcarrier preset in subcarriers except subcarriers with numbers of 0, 1, 6 and 7 in each RB; if the first DMRS is of the second type and the first DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the second set of time-frequency resources is 1000, or the second set of time-frequency resources occupies a preset subcarrier with a number of 0, 1, 6, or 7 in each RB.

According to the method for data transmission provided by the embodiment of the application, the frequency domain position of the second time frequency resource set is specifically which subcarrier in one RB can be determined according to the type of the first DMRS port number and the specific port number, so that the frequency domain position of the second time frequency resource set can be determined only by determining the first DMRS port number.

With reference to the first aspect, in certain implementations of the first aspect, the second set of time-frequency resources occupies a subcarrier number 0 in each RB; or the second time-frequency resource set occupies subcarriers with the number of 1 in each RB; or, the second time-frequency resource set occupies subcarriers with the number of 0 in each RB; or the second time-frequency resource set occupies subcarriers numbered 2 in each RB.

Specifically, the second set of time-frequency resources occupies a preset subcarrier of odd numbered subcarriers in each RB, and the preset subcarrier includes: the second time frequency resource set occupies subcarriers with the number of 1 in each RB; or, the second time-frequency resource set occupies a preset subcarrier in subcarriers with even numbers in each RB, and the preset subcarrier includes: the second time frequency resource set occupies a subcarrier with the number of 0 in each RB; the second time-frequency resource set occupies a preset subcarrier except for subcarriers numbered 0, 1, 6 and 7 in each RB, and the method comprises the following steps: the second time frequency resource set occupies subcarriers with the number of 2 in each RB; the second time-frequency resource set occupies a subcarrier preset in the numbers of 0, 1, 6 and 7 in each RB, and the method comprises the following steps: the second set of time-frequency resources occupies subcarriers numbered 0 in each RB.

According to the method for data transmission provided in the embodiment of the present application, when it is determined that the subcarrier occupied by the second time-frequency resource set may be any one of a plurality of subcarriers in one RB, a subcarrier with a smallest number among the plurality of subcarriers is generally selected as the subcarrier occupied by the second time-frequency resource set.

With reference to the first aspect, in certain implementations of the first aspect, the indicating the frequency-domain location of the first set of time-frequency resources includes: determining a DMRS port number corresponding to second data according to the second DCI; if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1002, or the first set of time-frequency resources occupies a preset subcarrier of odd-numbered subcarriers in each RB; if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1002 and 1003, the DMRS port number associated with the first set of time-frequency resources is 1000, or the first set of time-frequency resources occupies a preset subcarrier of subcarriers with even numbers in each RB; if the second DMRS is of the second type and the second DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1004, or the first set of time-frequency resources occupies a subcarrier preset in subcarriers except subcarriers with numbers of 0, 1, 6 and 7 in each RB; if the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the first set of time-frequency resources is 1002, or the first set of time-frequency resources occupies a subcarrier preset in

numbers

0, 1, 6, and 7 in each RB.

Specifically, the first set of time-frequency resources occupies a preset one of odd numbered subcarriers within each RB includes: the first set of time-frequency resources occupies subcarriers numbered 1 in each RB; or, the first set of time-frequency resources occupies a preset subcarrier of even numbered subcarriers in each RB, and the preset subcarrier includes: the first set of time-frequency resources occupies subcarriers with the number of 0 in each RB; the first set of time-frequency resources occupies a preset subcarrier except for subcarriers numbered 0, 1, 6 and 7 in each RB, and includes: the first set of time-frequency resources occupies subcarriers numbered 2 in each RB; the first set of time-frequency resources occupies a subcarrier preset in the

numbers

0, 1, 6 and 7 in each RB, and includes: the first set of time-frequency resources occupies a subcarrier number 0 within each RB.

According to the method for data transmission provided by the embodiment of the application, the frequency domain position of the first time-frequency resource set is specifically which subcarrier in one RB can be determined according to the type of the second DMRS port number and the specific port number, so that the frequency domain position of the first time-frequency resource set can be determined only by determining the second DMRS port number.

With reference to the first aspect, in certain implementation manners of the first aspect, the first DCI includes a first field, the second DCI includes a second field, and the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, where the location relationship includes at least one of: the time domain resources and/or the frequency domain resources occupied by the first data and the second data are completely overlapped; the time domain resources and/or frequency domain resources occupied by the first data and the second data are partially overlapped; the time domain resources and/or the frequency domain resources occupied by the first data and the second data respectively are not overlapped.

According to the method for data transmission provided by the embodiment of the application, the network device can add a field indicating the position relationship of time domain resources and/or frequency domain resources occupied by different data in the DCI.

With reference to the first aspect, in certain implementations of the first aspect, the determining a frequency-domain density of the second set of time-frequency resources using the positional relationship includes: if the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively are completely overlapped, the frequency domain density of the second time frequency resource set is equal to the frequency domain density of the first time frequency resource set, wherein the frequency domain density of the first time frequency resource set is based on the frequency domain resource indication information in the first DCI; if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the second time frequency resource set is equal to X, the X is determined according to the first field or determined according to the high-level configuration parameters, and the value of the X is 2 or 4; and/or, the determining the frequency domain density of the first set of time-frequency resources by the position relationship comprises: if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI; and if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the second field or the high-level configuration parameters, and the value of the Y is 2 or 4.

According to the method for data transmission provided in the embodiment of the present application, the position relationship between the time domain resource and/or the frequency domain resource occupied by the first data and the second data, respectively, can be used to indicate the relationship between the frequency domain density of the second time-frequency resource set and the frequency domain density of the first time-frequency resource set.

In a second aspect, a method for data transmission is provided, including: determining a first time-frequency resource set and at least one second time-frequency resource set, wherein the remaining time-frequency resource sets are used for mapping first data and the at least one second data, and are preset time-frequency resource sets except the first time-frequency resource set and the at least one second time-frequency resource set, wherein the first time-frequency resource set is used for bearing a first Phase Tracking Reference Signal (PTRS), the at least one second time-frequency resource set is respectively used for bearing at least one second PTRS, the first PTRS is used for demodulating the first data, and the at least one second PTRS is respectively used for demodulating at least one second data; receiving the first data and the at least one second data. Specifically, the time frequency resource carrying the second PTRS may be a subset of the second time frequency resource. The time frequency resource actually carrying the second PTRS is determined according to the indication information of the DCI scheduling the second data, where the indication information may select one of the time frequency resources of the multiple candidate second PTRS, and the second time frequency resource includes the time frequency resources of the multiple candidate second PTRS indicated by the DCI.

According to the method for data transmission provided by the embodiment of the application, the terminal equipment determines the PTRS mapped time-frequency resource sets corresponding to the plurality of data respectively, and determines that the data is not demodulated on the PTRS mapped time-frequency resource sets.

It is to be understood that the first data and the at least one second data described above are not mapped on the first set of time-frequency resources and the at least one second set of time-frequency resources; or the first data carries out rate matching according to the first time-frequency resource set and the second time-frequency resource set; or the first time-frequency resource and the at least one second time-frequency resource are rate matching resources of the first data, the base station sends the first data and performs rate matching according to the positions of the first time-frequency resource and the at least one second time-frequency resource, and the terminal equipment receives the first data and performs data reception according to the positions of the first time-frequency resource and the at least one second time-frequency resource.

Optionally, the preset time-frequency resource set is determined according to the time-frequency resource position indicated by the DCI scheduling the data; or, the remaining time-frequency resource set is determined directly according to the DCI for scheduling the data.

The first data and the second data adopt different transmission ports; or, the first data and the second data correspond to different DMRS ports; or, the first data and the second data are different codewords; or, the first data and the second data correspond to different TBs; or, the first data and the second data correspond to different transmission layers; or, the spatial filtering information of the first data and the second data are different; or, the first data and the second data occupy the same carrier; or, the first data and said second data occupy the same BWP.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: receiving first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

According to the method for data transmission provided by the embodiment of the present application, in order to demodulate a plurality of data, a terminal device needs to receive a plurality of DCIs respectively corresponding to the plurality of data.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; or, the control resource set groups corresponding to the first DCI and the second DCI are different; or, the physical downlink control channel configuration parameters corresponding to the first DCI and the second DCI are different; or, the DMRS ports of the demodulation reference signals indicated by the first DCI and the second DCI belong to different Code Division Multiplexing (CDM) groups; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI are located in the same carrier; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP; or, the scrambling code scrambled by the first DCI is different from the scrambling code scrambled by the second DCI; or, the HARQ process group in which the HARQ process code indicated by the first DCI is located is different from the HARQ process group in which the HARQ process code indicated by the second DCI is located; or, the transmission beam indicated by the first DCI is different from the transmission beam indicated by the second DCI; or, the transmission beam group indicated by the first DCI and the transmission beam group indicated by the second DCI are different.

With reference to the second aspect, in some implementations of the second aspect, the determining the first set of time-frequency resources and the second set of time-frequency resources corresponding to the second codeword includes: determining the first time-frequency resource set according to preconfigured information, wherein the time domain density of the first time-frequency resource set is determined according to a first Modulation and Coding Scheme (MCS), and the first MCS is indicated by the preconfigured information; or, the preconfiguration information directly indicates the time domain density size of the first set of time frequency resources; determining the frequency domain density of the first set of time-frequency resources according to a first number of Resource Blocks (RBs), wherein the first number of RBs is indicated by the preconfigured information; or, the preconfiguration information directly indicates a frequency domain density size of the first set of time-frequency resources; the preconfiguration information indicating the frequency domain location of the first set of time frequency resources comprises: the preconfiguration information indicates subcarriers occupied by the first set of time-frequency resources within one RB; or, the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources; the preconfiguration information indicates that a time domain starting position of the first set of time and frequency resources is a first time domain starting position, wherein the first time domain starting position is not later than time domain starting positions of the first data and the second data; determining a second time frequency resource set according to the preconfigured information, wherein the time domain density of the second time frequency resource set is determined according to a second MCS, and the second MCS is indicated by the preconfigured information; or, the preconfiguration information directly indicates the time domain density size of the second time frequency resource set; determining the frequency domain density of the second time frequency resource set according to a second RB quantity, wherein the second RB quantity is indicated by the preconfigured information; or, the preconfiguration information directly indicates a frequency domain density size of the second set of time-frequency resources; the preconfiguration information indicating the frequency domain location of the second set of time-frequency resources comprises: the preconfiguration information indicates subcarriers occupied by the second time-frequency resource set in one RB; or the preconfiguration information indicates a DMRS port number associated with the second time frequency resource set, wherein the DMRS port associated with the second time frequency resource set and the DMRS port associated with the first time frequency resource set belong to different CDM groups; the preconfiguration information indicates that the time domain starting position of the second time frequency resource set is the first time domain starting position.

It should be understood that, the determining the time domain density of the first set of time and frequency resources based on the first MCS as referred to in the present application refers to determining the time domain density of the set of time and frequency resources according to the first MCS and the known first transmission capability value of the terminal device. The known first transmission capacity value of the terminal equipment is used for determining the time domain density of the PTRS corresponding to the first data; similarly, the aforementioned determining the time domain density of the second time frequency resource set based on the second MCS refers to determining the time domain density of the time frequency resource set according to the second MCS and the third transmission capability value known by the terminal device. And the terminal device knows that the third transmission capability value is used for determining the time domain density of the PTRS corresponding to the second data.

It should also be understood that the frequency-domain density of the first set of time-frequency resources referred to in this application is determined according to the number of the first resource blocks RB, which means that the frequency-domain density of the set of time-frequency resources is determined according to the first RB and the known second transmission capability value of the terminal device. The terminal device knows that the second transmission capability value is used for determining the frequency domain density of the PTRS corresponding to the first data; similarly, the aforementioned determining the frequency-domain density of the second time-frequency resource set based on the second RB refers to determining the frequency-domain density of the time-frequency resource set according to the second RB and a known fourth transmission capability value of the terminal device. Wherein the fourth transmission capability value is known by the terminal device for determining the frequency domain density of the PTRS corresponding to the second data.

According to the method for data transmission provided by the embodiment of the application, the terminal device can determine the first time-frequency resource set and the second time-frequency resource set according to the pre-configuration information.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: receiving a high layer signaling, wherein the high layer signaling is used for indicating the first set of time-frequency resources and at least one second set of time-frequency resources.

According to the method for data transmission provided by the embodiment of the application, the terminal device can receive the high-level signaling sent by the network device, and determine the first time-frequency resource set and the second time-frequency resource set based on the high-level signaling.

With reference to the second aspect, in some implementations of the second aspect, the indicating the frequency-domain location of the second set of time-frequency resources comprises: determining a first demodulation reference signal (DMRS) port number of the first data according to the first DCI; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1002, or the second time-frequency resource set occupies a subcarrier preset in subcarriers with odd numbers in each RB; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the DMRS port number associated with the second time-frequency resource set is 1000, or the second time-frequency resource set occupies a subcarrier preset in subcarriers with even numbers in each RB; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or the second time-frequency resource set occupies a subcarrier preset in subcarriers except subcarriers with numbers of 0, 1, 6 and 7 in each RB; if the first DMRS is of the second type and the first DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the second set of time-frequency resources is 1000, or the second set of time-frequency resources occupies a preset subcarrier with a number of 0, 1, 6, or 7 in each RB. The subcarrier numbers are sequentially numbered from the highest frequency subcarrier to the lowest frequency subcarrier within 1 RB, or the subcarrier numbers are sequentially numbered from the lowest frequency subcarrier to the highest frequency subcarrier within 1 RB.

With reference to the second aspect, in certain implementations of the second aspect, the second set of time-frequency resources occupies a subcarrier number 0 in each RB; or, the second time-frequency resource set occupies subcarriers with number 1 in each RB; or, the second set of time-frequency resources occupies the subcarrier with the number 02 in each RB. Specifically, the second set of time-frequency resources occupies a preset subcarrier of odd numbered subcarriers in each RB, and the preset subcarrier includes: the second time frequency resource set occupies subcarriers with the number of 1 in each RB; or, the second time-frequency resource set occupies a preset subcarrier in subcarriers with even numbers in each RB, and the preset subcarrier includes: the second time frequency resource set occupies a subcarrier with the number of 0 in each RB; the second time-frequency resource set occupies a preset subcarrier except for subcarriers numbered 0, 1, 6 and 7 in each RB, and the method comprises the following steps: the second time frequency resource set occupies subcarriers with the number of 2 in each RB; the second time-frequency resource set occupies a subcarrier preset in the numbers of 0, 1, 6 and 7 in each RB, and the method comprises the following steps: the second set of time-frequency resources occupies subcarriers numbered 0 in each RB.

According to the method for data transmission provided in the embodiment of the present application, when it is determined that the subcarrier occupied by the first time-frequency resource set may be any one of a plurality of subcarriers in one RB, a subcarrier with a smallest number among the plurality of subcarriers is generally selected as the subcarrier occupied by the first time-frequency resource set, and a subcarrier with a largest number may also be selected as the subcarrier occupied by the first time-frequency resource set.

With reference to the second aspect, in some implementations of the second aspect, the indicating the frequency domain location of the first set of time-frequency resources includes: determining a DMRS port number corresponding to second data according to the second DCI; if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1002, or the first set of time-frequency resources occupies a preset subcarrier of odd-numbered subcarriers in each RB; if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1002 and 1003, the DMRS port number associated with the first set of time-frequency resources is 1000, or the first set of time-frequency resources occupies a preset subcarrier of subcarriers with even numbers in each RB; if the second DMRS is of the second type and the second DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1004, or the first set of time-frequency resources occupies a subcarrier preset in subcarriers except subcarriers with numbers of 0, 1, 6 and 7 in each RB; if the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the first set of time-frequency resources is 1002, or the first set of time-frequency resources occupies a subcarrier preset in numbers 0, 1, 6, and 7 in each RB.

With reference to the second aspect, in some implementations of the second aspect, a first field is included in the first DCI, a second field is included in the second DCI, and the first field and/or the second field are/is used to indicate a location relationship of time-frequency resource sets occupied by first data and the second data, respectively, where the location relationship includes at least one of: the time domain resources and/or the frequency domain resources occupied by the first data and the second data are completely overlapped; the time domain resources and/or frequency domain resources occupied by the first data and the second data are partially overlapped; the time domain resources and/or the frequency domain resources occupied by the first data and the second data respectively are not overlapped.

According to the method for data transmission provided by the embodiment of the application, the DCI received by the terminal device includes a field indicating a position relationship between time domain resources and/or frequency domain resources occupied by the first data and the second data.

Optionally, the first data and the second data are located in the same time unit, where the time unit is a slot, or an Orthogonal Frequency Division Multiplexing (OFDM) symbol, or a Code Division Multiple Access (CDMA) symbol.

Optionally, there is an overlapping portion of the OFDM symbols occupied by the first data and the second data.

With reference to the second aspect, in certain implementations of the second aspect, the determining a frequency-domain density of the second set of time-frequency resources using the positional relationship comprises: if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the second time frequency resource set is equal to the frequency domain density of the first time frequency resource set, wherein the frequency domain density of the first time frequency resource set is determined based on the frequency domain resource indication information in the first DCI; if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to X, the X is determined according to the first field (the two state values in the first field correspond to the time-frequency resources occupied by the first data and the second data, which are partially overlapped and correspond to X ═ 2 and X ═ 4, respectively) or determined according to a high-level configuration parameter, and the value of X is 2 or 4; and/or, the determining the frequency domain density of the first set of time-frequency resources by the position relationship comprises: if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI; and if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the second field or the high-level configuration parameters, and the value of the Y is 2 or 4.

In a third aspect, a method for data transmission is provided, including: determining a second time frequency resource set, wherein the time domain density of the second time frequency resource set is determined according to a preset Modulation Coding Scheme (MCS), and the frequency domain density of the second time frequency resource set is determined according to the preset number of Resource Blocks (RB); determining a first set of time frequency resources for mapping a phase tracking reference signal, PTRS, for demodulating first data; and sending the first data, wherein a residual time-frequency resource set is used for mapping the first data, and the residual time-frequency resource set is a time-frequency resource set except the first time-frequency resource set and the second time-frequency resource set in a preset time-frequency resource set.

Optionally, the mapping that the first data is not mapped in the first time-frequency resource set and the second time-frequency resource set may also be described as: and the first data is subjected to rate matching according to the first time-frequency resource set and the second time-frequency resource set.

It should be understood that the above mentioned remaining set of time-frequency resources for mapping the first data may be understood as a part of the remaining set of time-frequency resources for mapping the first data; alternatively, it may be understood that all of the remaining sets of time-frequency resources are used for mapping the first data.

According to the method for data transmission provided in the embodiment of the application, before sending data, a network device determines, based on a preset modulation and coding scheme MCS and a preset number of resource blocks RB, a second time-frequency resource set that cannot map first data on a time-frequency resource set carrying the first data, and determines a first time-frequency resource set that cannot map the first data on the time-frequency resource set carrying the first data, where the first time-frequency resource set is a frequency resource set that can be used for mapping and demodulating a PTRS of the first data, and the network device sends the first data after determining that the first time-frequency resource set and the second time-frequency resource set that cannot map the first data on the time-frequency resource set carrying the first data. That is to say, the network device can determine the second time-frequency resource set according to the preset MCS and the preset number of RBs before sending data, so as to improve the performance of sending data.

With reference to the third aspect, in some implementations of the third aspect, the method further includes: determining subcarriers occupied by the second time-frequency resource set in one RB; and determining a time domain starting position of the second time frequency resource set.

Optionally, the second time-frequency resource set is used to carry a second PTRS, and the second PTRS is used to demodulate second data.

The second time-frequency resource set is used for carrying a second PTRS, and the second time-frequency resource set can be understood as a part of the time-frequency resource set in the second time-frequency resource set to carry the second PTRS; alternatively, it may also be understood that all the time-frequency resource sets in the second time-frequency resource set are used for carrying the second PTRS.

According to the method for data transmission provided in the embodiment of the present application, the network device determines that the second time-frequency resource set also needs to determine a frequency domain position and a time domain position of the second time-frequency resource set, where the frequency domain position of the second time-frequency resource set is understood as a subcarrier occupied by the second time-frequency resource set in one RB, so that the second time-frequency resource set can be accurately determined.

Illustratively, the time domain starting position of the second set of time frequency resources is not later than the time domain starting position of the first data.

With reference to the third aspect, in certain implementations of the third aspect, the determining subcarriers occupied by the second set of time-frequency resources within one RB includes: directly determining the sub-carriers occupied by the second time-frequency resource set in one RB; or, determining a DMRS port number associated with the second time frequency resource set, wherein the DMRS port number indicates a subcarrier occupied by the second time frequency resource set in one RB.

Optionally, the determining of the DMRS port number associated with the second time-frequency resource set is specifically, the determining of the DMRS port number associated with the second time-frequency resource set is performed according to a first DMRS port number in DCI that schedules first data, where the first DMRS is the DMRS port number of the first data, and the first DMRS port number is different from the DMRS port number associated with the second time-frequency resource set, and specifically, occupies different CDM groups. Alternatively, the second DMRS port number is different from the first DMRS port number according to the second DMRS port number in the DCI scheduling the first data.

According to the method for data transmission provided in this embodiment, when determining the frequency domain position of the second set of time-frequency resources, the network device may directly specify which subcarriers the second set of time-frequency resources occupies in each RB, or indirectly indicate which subcarriers the second set of time-frequency resources occupies in each RB. For example, by indicating the DMRS port number associated with the second time-frequency resource set and according to the correspondence between the DMRS port number predefined in the protocol and the subcarriers in one RB, which subcarriers are occupied by the second time-frequency resource in each RB is determined, so as to provide a flexible selection scheme for determining the frequency domain position of the second time-frequency resource set.

With reference to the third aspect, in some implementations of the third aspect, the subcarriers occupied by the second set of time-frequency resources within one RB include: a first subcarrier, wherein the first subcarrier is different from a subcarrier occupied by a DMRS for demodulating the first data within one RB.

According to the method for data transmission provided in the embodiment of the present application, the network device determines which subcarriers the second time-frequency resource set occupies in each RB, and may determine the subcarriers the second time-frequency resource set occupies by determining the subcarriers occupied by the DMRS that demodulates the first data only by using one of the subcarriers other than the subcarriers occupied by the DMRS that demodulates the first data in one RB.

It should be understood that the DMRS used to demodulate the first data may be referred to as a first DMRS. Wherein the port number of the first DMRS is determined based on the first downlink control information DCI. That is, in certain implementations of the third aspect, the method described above further includes: and transmitting first DCI, wherein the first DCI is used for scheduling first data, and the first DCI is used for indicating a first DMRS port number.

With reference to the third aspect, in some implementations of the third aspect, the first subcarrier includes: if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in an odd number in one RB, wherein the first DMRS is the DMRS port number corresponding to the DMRS for demodulating the first data; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the first subcarrier is a subcarrier preset in an RB with even number; if the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in subcarriers except subcarriers numbered 0, 1, 6 and 7 in one RB; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004 and 1005, the first subcarrier is a subcarrier preset in one RB and numbered as 0, 1, 6 and 7. Wherein port numbers 1000, 1001, 1004, 1005 of the first type of DMRS belong to CDM group 0, and port numbers 1002, 1003, 1006, 1007 of the first type of DMRS belong to CDM group 1; port numbers 1000, 1001, 1006, 1007 of the second type of DMRS belong to CDM group 0, port numbers 1002, 1003, 1008, 1009 of the second type of DMRS belong to CDM group 1, and port numbers 1004, 1005, 1010, 1011 of the second type of DMRS belong to CDM group 2.

According to the method for data transmission provided by the embodiment of the present application, which subcarrier in the first subcarrier, specifically, in one RB, can be determined according to the type of the first DMRS port number and the specific port number, so that the first subcarrier can be determined only by determining the first DMRS port number.

With reference to the third aspect, in some implementations of the third aspect, the number of the first subcarrier is 0; or, the number of the first subcarrier is 1; or, the number of the first subcarrier is 2. Specifically, when the first subcarrier is a preset subcarrier in odd-numbered subcarriers in one RB, the first subcarrier is a subcarrier numbered 1 in one RB; when the first subcarrier is a preset subcarrier in subcarriers with even numbers in one RB, the first subcarrier is a subcarrier with 0 numbers in one RB; when the first subcarrier is a subcarrier which is preset in one RB except for subcarriers numbered 0, 1, 6 and 7, the first subcarrier is a subcarrier numbered 2 in one RB; when the first subcarrier is a subcarrier numbered as a preset one of 0, 1, 6 and 7 in one RB, the first subcarrier is a subcarrier numbered as 0 in one RB. The subcarrier numbers are sequentially numbered from the highest frequency subcarrier to the lowest frequency subcarrier within 1 RB, or the subcarrier numbers are sequentially numbered from the lowest frequency subcarrier to the highest frequency subcarrier within 1 RB.

According to the method for data transmission provided by the embodiment of the present application, when it is determined that the first subcarrier may be any one of a plurality of subcarriers within one RB, a subcarrier with a smallest number among the plurality of subcarriers is generally selected as the first subcarrier, and a subcarrier with a largest number may also be selected as the first subcarrier.

With reference to the third aspect, in certain implementations of the third aspect, the demodulation reference signal, DMRS, port number associated with the second set of time-frequency resources includes: a second DMRS port number, wherein the second DMRS port number is distinct from a first DMRS port number corresponding to a DMRS that demodulates the first data.

According to the method for data transmission provided by the embodiment of the application, the first DMRS and the second DMRS are in different CDM groups, that is, the network device determines the DMRS port number associated with the second time-frequency resource set, where a port number other than the first DMRS port number corresponding to the DMRS that demodulates the first data may be used as the DMRS port number associated with the second time-frequency resource set, so that the DMRS port number associated with the second time-frequency resource set may be determined only by determining the first DMRS port number.

With reference to the third aspect, in certain implementations of the third aspect, the second DMRS port number includes: if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1002 or 1003; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the second DMRS port number is 1000; if the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1004 or 1005; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the second DMRS port number is 1000.

According to the method for data transmission provided by the embodiment of the application, the second DMRS port number is specifically which port number in one CDM group can be determined according to the type of the first DMRS port number and the specific port number, so that the second DMRS port number can be determined only by determining the first DMRS port number.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes: and sending a high-layer signaling, wherein the high-layer signaling is used for indicating the second time-frequency resource set.

According to the method for data transmission provided in the embodiment of the present application, after determining the second time-frequency resource set, the network device can notify the terminal device receiving the first data through a high-level signaling, so that the terminal device can determine not to demodulate the first data on the second time-frequency resource set.

In a fourth aspect, a method for data transmission is provided, comprising: determining a second time frequency resource set, wherein the time domain density of the second time frequency resource set is determined according to a preset Modulation Coding Scheme (MCS), and the frequency domain density of the second time frequency resource set is determined according to the preset number of Resource Blocks (RB); determining a first set of time-frequency resources, the first set of time-frequency resources being used for mapping PTRSs, the PTRS being used for demodulating first data; receiving the first data, wherein a remaining time-frequency resource set is used for mapping the first data, and the remaining time-frequency resource set is a time-frequency resource set except the first time-frequency resource set and the second time-frequency resource set in a preset time-frequency resource set.

Optionally, the non-mapping of the first data on the first set of time-frequency resources and the second set of time-frequency resources may also be described as: and the first data is subjected to rate matching according to the first time-frequency resource set and the second time-frequency resource set.

According to the method for data transmission provided by the embodiment of the application, before receiving data, a terminal device determines, based on a preset Modulation Coding Scheme (MCS) and a preset number of Resource Blocks (RB), a second time-frequency resource set which cannot map first data on a time-frequency resource set carrying the first data, and determines a first time-frequency resource set which cannot map the first data on the time-frequency resource set carrying the first data, wherein the first time-frequency resource set is a frequency resource set which maps a Packet Transport Reference Signal (PTRS) for demodulating the first data, and a network device sends the first data after determining that the first time-frequency resource set and the second time-frequency resource set which cannot map the first data on the time-frequency resource set carrying the first data are determined. That is to say, the terminal device can determine the second time-frequency resource set according to the preset MCS and the preset number of RBs when receiving the first data, so as to improve the performance of receiving data.

With reference to the fourth aspect, in some implementations of the fourth aspect, further comprising: determining subcarriers occupied by the second time-frequency resource set in one RB; and determining a time domain starting position of the second time frequency resource set.

According to the method for data transmission provided in the embodiment of the present application, the terminal device determines that the second time-frequency resource set also needs to determine a frequency domain position and a time domain position of the second time-frequency resource set, where the frequency domain position of the second time-frequency resource set is understood as a subcarrier occupied by the second time-frequency resource set in one RB, so that the second time-frequency resource set can be accurately determined.

With reference to the fourth aspect, in some implementations of the fourth aspect, the determining subcarriers occupied by the second set of time-frequency resources within one RB includes: directly determining the sub-carriers occupied by the second time-frequency resource set in one RB; or, determining a DMRS port number associated with the second time frequency resource set, wherein the DMRS port number indicates a subcarrier occupied by the second time frequency resource set in one RB.

According to the method for data transmission provided in the embodiment of the present application, when determining the frequency domain position of the second time-frequency resource set, the terminal device may directly determine which subcarriers are occupied by the second time-frequency resource set in each RB, or indirectly determine which subcarriers are occupied by the second time-frequency resource set in each RB. For example, a flexible selection scheme is provided for determining the frequency domain position of the second set of time frequency resources by determining a DMRS port number associated with the second set of time frequency resources, the DMRS port number being used to determine which subcarriers the second set of time frequency resources occupy within each RB.

With reference to the fourth aspect, in some implementations of the fourth aspect, the subcarriers occupied by the second set of time-frequency resources within one RB include: a first subcarrier, wherein the first subcarrier is different from a subcarrier occupied by a DMRS for demodulating the first data within one RB.

According to the method for data transmission provided by the embodiment of the application, the terminal device determines which subcarriers are occupied by the second time-frequency resource set in each RB, and one of the subcarriers except the subcarrier occupied by the DMRS used for demodulating the first data in one RB is used as the subcarrier occupied by the second time-frequency resource set, so that the subcarrier occupied by the second time-frequency resource set can be determined only by determining the subcarrier occupied by the DMRS used for demodulating the first data.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first subcarrier includes: if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in an odd number in one RB, wherein the first DMRS is the DMRS port number corresponding to the DMRS for demodulating the first data; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the first subcarrier is a subcarrier preset in an RB with even number; if the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in subcarriers except subcarriers numbered 0, 1, 6 and 7 in one RB; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004 and 1005, the first subcarrier is a subcarrier preset in one RB and numbered as 0, 1, 6 and 7. Wherein port numbers 1000, 1001, 1004, 1005 of the first type of DMRS belong to CDM group 0, and port numbers 1002, 1003, 1006, 1007 of the first type of DMRS belong to CDM group 1; port numbers 1000, 1001, 1006, 1007 of the second type of DMRS belong to CDM group 0, port numbers 1002, 1003, 1008, 1009 of the second type of DMRS belong to CDM group 1, and port numbers 1004, 1005, 1010, 1011 of the second type of DMRS belong to CDM group 2.

With reference to the fourth aspect, in some implementations of the fourth aspect, the number of the first subcarrier is 0; or, the number of the first subcarrier is 1; or, the number of the first subcarrier is 2. Specifically, when the first subcarrier is a preset subcarrier in odd-numbered subcarriers in one RB, the first subcarrier is a subcarrier numbered 1 in one RB; when the first subcarrier is a preset subcarrier in subcarriers with even numbers in one RB, the first subcarrier is a subcarrier with 0 numbers in one RB; when the first subcarrier is a subcarrier which is preset in one RB except for subcarriers numbered 0, 1, 6 and 7, the first subcarrier is a subcarrier numbered 2 in one RB; when the first subcarrier is a subcarrier numbered as a preset one of 0, 1, 6 and 7 in one RB, the first subcarrier is a subcarrier numbered as 0 in one RB. The subcarrier numbers are sequentially numbered from the highest frequency subcarrier to the lowest frequency subcarrier within 1 RB, or the subcarrier numbers are sequentially numbered from the lowest frequency subcarrier to the highest frequency subcarrier within 1 RB.

With reference to the fourth aspect, in some implementations of the fourth aspect, the demodulation reference signal, DMRS, port number associated with the second set of time-frequency resources includes: a second DMRS port number, wherein the second DMRS port number is distinct from a first DMRS port number corresponding to a DMRS that demodulates the first data.

According to the method for data transmission provided by the embodiment of the application, the terminal device may determine the DMRS port number associated with the second time-frequency resource set by using a port number other than the first DMRS port number corresponding to the DMRS demodulating the first data in one CDM group as the DMRS port number associated with the second time-frequency resource set, so that the DMRS port number associated with the second time-frequency resource set may be determined only by determining the first DMRS port number in one CDM group.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the second DMRS port number comprises: if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1002 or 1003; if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the second DMRS port number is 1000; if the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1004 or 1005; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the second DMRS port number is 1000.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: receiving first Downlink Control Information (DCI), wherein the first DCI is used for scheduling the first data; the first DCI is used to indicate the first DMRS port number.

According to the method for data transmission provided in the embodiment of the present application, before demodulating the first data, the terminal device receives a first DCI for scheduling the first data, where the first DCI is issued by the network device, and the first DCI may indicate the first DMRS port number.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: receiving a higher layer signaling, wherein the higher layer signaling is used for indicating the second set of time-frequency resources.

According to the method for data transmission provided in the embodiment of the present application, after receiving a high layer signaling indicating a second time frequency resource set sent by a network device, a terminal device may further determine not to demodulate the first data on the second time frequency resource set.

In a fifth aspect, a method for data transmission is provided, including: transmitting first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling at least one second data, and the first DCI is used for scheduling first data; the first DCI includes a first field, the second DCI includes a second field, the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, where the location relationship includes at least one of: the time domain resources and/or the frequency domain resources occupied by the first data and the second data are completely overlapped; the time domain resources and/or frequency domain resources occupied by the first data and the second data are partially overlapped; the time domain resources and/or the frequency domain resources occupied by the first data and the second data respectively are not overlapped.

Optionally, the first data and the second data are located in the same time unit, where the time unit is a slot, or an OFDM symbol, or a CDMA symbol.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources; if the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively are completely overlapped, the frequency domain density of the second time frequency resource set is equal to the frequency domain density of the first time frequency resource set, wherein the frequency domain density of the first time frequency resource set is based on the frequency domain resource indication information in the first DCI; if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the second time frequency resource set is equal to X, the X is determined according to the first field or determined according to the high-level configuration parameters, and the value of the X is 2 or 4; and/or, the position relation is used for determining the frequency domain density of the first set of time-frequency resources; if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI; and if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the second field or the high-level configuration parameters, and the value of the Y is 2 or 4. The second time frequency resource set is used for bearing a second PTRS (packet transport service), and the second PTRS is used for analyzing second data; the first set of time-frequency resources is used for carrying a first PTRS, and the first PTRS is used for analyzing first data.

In a sixth aspect, a method for data transmission is provided, comprising: receiving first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI corresponds to at least one second data in a one-to-one manner, the first DCI is used for demodulating first data, and the second DCI is used for demodulating corresponding second data; the first DCI includes a first field, the second DCI includes a second field, the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, where the location relationship includes at least one of: the time domain resources and/or the frequency domain resources occupied by the first data and the second data are completely overlapped; the time domain resources and/or frequency domain resources occupied by the first data and the second data are partially overlapped; the time domain resources and/or the frequency domain resources occupied by the first data and the second data respectively are not overlapped.

According to the method for data transmission provided by the embodiment of the application, a field indicating the position relationship of time domain resources and/or frequency domain resources occupied by different data is added in DCI received by terminal equipment.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources; if the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively are completely overlapped, the frequency domain density of the second time frequency resource set is equal to the frequency domain density of the first time frequency resource set, wherein the frequency domain density of the first time frequency resource set is based on the frequency domain resource indication information in the first DCI; if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the second time frequency resource set is equal to X, the X is determined according to the first field or determined according to the high-level configuration parameters, and the value of the X is 2 or 4; and/or, the position relation is used for determining the frequency domain density of the first set of time-frequency resources; if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI; and if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the second field or the high-level configuration parameters, and the value of the Y is 2 or 4. The second time frequency resource set is used for bearing a second PTRS (packet transport service), and the second PTRS is used for analyzing second data; the first set of time-frequency resources is used for carrying a first PTRS, and the first PTRS is used for analyzing first data.

In a seventh aspect, an apparatus for data transmission is provided, which may be configured to perform the operations of the first aspect, the third aspect, and the fifth aspect, and any possible implementation manner of the first aspect, the third aspect, and the fifth aspect. Specifically, the means (means) for data transmission includes corresponding means for performing the steps or functions described in the first, third, and fifth aspects, which may be the network device or a chip or functional module inside the network device of the first, third, and fifth aspects. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In an eighth aspect, an apparatus for data transmission is provided, which may be used to perform the operations of the terminal device in the second aspect, the fourth aspect, the sixth aspect and any possible implementation manner of the second aspect, the fourth aspect, and the sixth aspect. Specifically, the means (means) for data transmission may be the terminal device or the terminal device internal chip or the terminal device of the second aspect, the fourth aspect or the sixth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a ninth aspect, there is provided an apparatus for data transmission, comprising a processor, a transceiver, a memory for storing a computer program, the transceiver for executing the transceiving steps in the method for data transmission in any one of the possible implementations of the first to sixth aspects, the processor for invoking and running the computer program from the memory to cause the apparatus for data transmission to execute the method for data transmission in any one of the possible implementations of the first to sixth aspects.

Optionally, there are one or more processors and one or more memories.

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

Optionally, the transceiver comprises a transmitter (transmitter) and a receiver (receiver).

In a tenth aspect, a system is provided, which comprises the apparatus for data transmission provided in the seventh and eighth aspects.

In an eleventh aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any one of the possible implementations of the first to sixth aspects described above.

In a twelfth aspect, a computer-readable medium is provided, which stores a computer program (which may also be referred to as code or instructions) that, when executed on a computer, causes the computer to perform the method of any one of the possible implementations of the first to sixth aspects.

In a thirteenth aspect, a chip system is provided, which includes a memory for storing a computer program and a processor for calling and running the computer program from the memory, so that a communication device in which the chip system is installed executes the method in any one of the possible implementation manners of the first to sixth aspects.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system suitable for use with embodiments of the present application.

Fig. 2 (a) and (b) are schematic diagrams illustrating that the terminal device receives downlink control information according to an embodiment of the present application.

Fig. 3 is a schematic diagram illustrating a plurality of network devices transmitting a plurality of downlink control information.

Fig. 4 is a schematic diagram of a method for data transmission according to an embodiment of the present application.

Fig. 5 is a schematic diagram of another method for data transmission according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a first embodiment provided by the present application.

Fig. 7 is a schematic diagram of the apparatus 10 for data transmission proposed in the present application.

Fig. 8 is a schematic structural diagram of a terminal device 20 suitable for use in the embodiment of the present application.

Fig. 9 is a schematic diagram of an apparatus 30 for data transmission proposed in the present application.

Fig. 10 is a schematic structural diagram of a network device 40 suitable for use in an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) or New Radio (NR) system, and the like.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, and it should be understood that the network device in the wireless communication system may be any device having a wireless transceiving function. Such devices include, but are not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (Node B, NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Home Base Station (e.g., Home evolved Node B, or Home Node B, HNB), BaseBand Unit (Base band Unit, BBU), Access Point (AP) in Wireless Fidelity (WIFI) system, etc., and may also be 5G, such as NR, gbb in system, or TRP, transmission Point (TRP or TP), one or a set of antennas (including multiple antennas, NB, or a transmission panel) of a Base Station in 5G system, or a Distributed Unit (DU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include an Active Antenna Unit (AAU). The CU implements part of the function of the gNB and the DU implements part of the function of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer. The DU is responsible for processing a physical layer protocol and a real-time service, and implements functions of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. The AAU implements part of the physical layer processing functions, radio frequency processing and active antenna related functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as the RRC layer signaling, may also be considered to be transmitted by the DU or by the DU + AAU under this architecture. It is to be understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

In the embodiment of the application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 is a wireless communication system 100 suitable for use with embodiments of the present application. The wireless communication system 100 may include at least one network device, such as the first network device 110 and the second network device 120 shown in fig. 1. First network device 110 and second network device 120 may each communicate with terminal device 130 over a wireless air interface. First network device 110 and second network device 120 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area.

The wireless communication system 100 further includes one or more terminal equipments (UEs) 130 located within the coverage area of the first network device 110 and the second network device 120. The terminal device 130 may be mobile or stationary. The terminal device 130 may communicate with one or more core networks (core networks) via a Radio Access Network (RAN).

The wireless communication system 100 may support coordinated multipoint (CoMP) transmission, that is, multiple cells or multiple transmission points (serving TRPs) may cooperate to send data to the same terminal device on the same time-frequency resource set or send data to the same terminal device on partially overlapped time-frequency resource sets or send data to the same terminal device on different time-frequency resource sets. Wherein the plurality of cells may belong to the same network device or different network devices and may be selected according to channel gain or path loss, received signal strength, received signal order, etc.

The terminal device 130 in the wireless communication system 100 may support multipoint transmission, that is, the terminal device 130 may communicate with the first network device 110 and may also communicate with the second network device 120, where the first network device 110 may serve as a serving network device, and the serving network device refers to the network device that provides services such as Radio Resource Control (RRC) connection, non-access stratum (NAS) mobility management, security input, and the like for the terminal device through a radio interface protocol.

Optionally, the first network device may be a serving network device, and the second network device may be a cooperative network device; alternatively, the first network device may be a cooperative network device and the second network device may be a serving network device. The service network device may send a control signaling to the terminal device, and the cooperative network device may send data to the terminal device; alternatively, the serving network device may send control signaling to the terminal device, and the serving network device and the cooperating network device may send data to the terminal device at the same time, or the serving network device and the cooperating network device may send control signaling to the terminal device at the same time, and the serving network device and the cooperating network device may send data to the terminal device at the same time. The present embodiment is not particularly limited to this.

Taking the first network device as a serving network device and the second network device as a cooperative network device as an example, the number of the second network devices may be one or more, and the second network devices and the first network devices are network devices that satisfy different quasi-co-location (QCL). The antenna port QCL is defined as that a signal transmitted from the antenna port QCL undergoes the same large-scale fading, and the large-scale fading includes delay spread, doppler shift, average channel gain, and average delay.

It is to be appreciated that the first network device and the second network device can both be serving network devices. For example, in a non-cell (non-cell) scenario or in a multi-cell scenario, the first network device and the second network device are both serving network devices in respective cells.

It should be further noted that the embodiments of the present application are also applicable to the same network device having non-QCL antenna ports. That is, the network device may be configured with different antenna panels, antenna ports belonging to different antenna panels in the same network device may be non-QCL, and cell-specific reference signal (CRS) resource configurations corresponding to the antenna ports may also be different.

To facilitate understanding of the embodiments of the present application, before describing the method for data transmission of the embodiments of the present application, a brief description is first given of several basic concepts and mapping relationships of codewords to layers and layers to antenna ports.

1. And (4) time frequency resource aggregation.

In a new radio access technology (NR) system of 3GPP, a downlink resource of the system is divided into a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols as viewed in time and is divided into a plurality of subcarriers as viewed in frequency.

A Physical Downlink Control Channel (PDCCH) in the downlink typically occupies the first two or three OFDM symbols in one subframe. The PDCCH is used to carry Downlink Control Information (DCI).

The DCI sent by the network device to the terminal device carries the terminal device-specific resource allocation control information and the terminal device-specific control information or other control information shared by the cells. A Physical Uplink Shared Channel (PUSCH) in an uplink of the system is used to carry uplink transmission data, and a frequency domain signal is generally generated using discrete fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). In general, one slot (slot) generally includes 14 OFDM symbols. The system also defines the size of a Physical Resource Block (PRB), one PRB includes 12 subcarriers in the frequency domain, and a certain subcarrier in a certain OFDM symbol is called a Resource Element (RE). Specifically, the PRB may be referred to as a Resource Block (RB) in this application.

2. And (5) scrambling.

The current protocol supports the transmission of a maximum of two code words (code words). Each codeword (e.g., codeword q) corresponds to a set of bits

Wherein the content of the first and second substances,

the bit number of the code word transmitted in the physical downlink shared channel is subjected to the following scrambling operation:

obtaining a group of bits corresponding to the scrambled code word

Wherein c is^(q)(i) Is a scrambling sequence.

3. And (5) modulating.

For each codeword (e.g., codeword q), the scrambled codeword would obtain a set of complex-valued modulation symbols using the modulation scheme shown in table 1:

TABLE 1 modulation scheme

Modulation scheme (modulation scheme)	Modulation order (modulation order)
		QPSK	2
16QAM	4
		64QAM	6
256QAM	8

Specifically, Quadrature Phase Shift Keying (QPSK) in table 1: is a digital modulation mode. It is divided into absolute phase shift and relative phase shift. Since the absolute phase shift method has a phase ambiguity problem, a relative phase shift method is mainly used in practice. The method is widely applied to wireless communication at present and becomes an important modulation and demodulation mode in modern communication.

16 Quadrature Amplitude Modulation (QAM), 64QAM, and 256 QAM. The quadrature amplitude modulation is a digital modulation method. 16QAM refers to a QAM modulation scheme containing 16 symbols; 256QAM is a 16-ary digital signal that is quadrature amplitude modulated, and the constellation is 16 × 16 — 256 points.

4. Layer mapping and antenna port mapping.

Before user plane data and signaling messages are sent out over the air interface to the physical layer, they need to be processed by a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, or a Media Access Control (MAC) layer.

The data processed at the physical layer is a Protocol Data Unit (PDU) of the MAC layer, i.e., a data stream. The data stream from the upper layer is called a codeword after being channel coded. Different codewords distinguish different data streams. Since the number of codewords is not consistent with the number of transmit antennas, the codewords can be mapped to different transmit antennas, and thus layer mapping and precoding are required. Wherein, layer mapping can be understood as that the code word is remapped to a plurality of layers according to a certain rule; precoding is understood to be mapping data mapped to multiple layers onto different antenna ports.

The network equipment encodes data to obtain a code word, maps the code word to a layer, maps the data mapped to a plurality of layers to an antenna port, sends the data to the terminal equipment through the corresponding antenna port, and sends a demodulation reference signal (DMRS) through the corresponding antenna port, so that the terminal equipment demodulates the received data according to the DMRS to obtain original data.

It should be noted that the antenna port may be understood as a transmitting antenna that can be identified by the receiving end device, or a transmitting antenna that can be spatially received separately, and the antenna port at this time may be understood as a virtual antenna port, that is, the antenna port is not directly corresponding to a certain physical antenna, but is formed after a plurality of physical antennas are virtualized. An antenna port may be defined based on a reference signal (or pilot signal, e.g., DMRS or CRS, etc.) associated with the antenna port, such as different antenna ports corresponding to different types of reference signals. Different antenna ports may also correspond to the same type of reference signals, and at this time, the different antenna ports are in the concept of space, that is, the reference signals corresponding to the different antenna ports on the same time-frequency resource are distinguished by spatial orthogonality. One antenna port may be one physical antenna on the transmitting end device, or may be a weighted combination of multiple physical antennas on the transmitting end device. In the embodiment of the present application, one antenna port corresponds to a port of a reference signal without specific description. Specifically, the modulated modulation symbols are mapped to one or more layers according to the correspondence shown in table 2. Modulation symbol for each codeword

Is mapped onto a layer x (i) ═ x⁽⁰⁾(i)...x^(υ-1)(i)]^T，

Where v is the number of transport layers,

is the number of modulation symbols per layer. Vector x (i) ═ x⁽⁰⁾(i)...x^(υ-1)(i)]^TMapping onto antenna ports according to the following formula:

wherein the content of the first and second substances,

for a terminal device, NR supports downlink data transmission of maximum 8 layers at present, where each codeword supports downlink transmission of maximum 4 layers, and each codeword corresponds to a respective independent coding and modulation scheme (MCS), and DCI includes an MCS field corresponding to each codeword, where the field indicates a modulation scheme, a target code rate, and spectral efficiency information.

TABLE 2 codeword to layer mapping

5. And (6) mapping the resources.

Antenna port

When data to be transmitted is mapped to Resource Elements (REs) in a PRB, both a network device and a terminal device that need to transmit data follow the following rules:

(1) the RE in the corresponding PRB is not used for transmitting the DMRS corresponding to the data and the DMRS of other co-scheduled terminal equipment, wherein the DMRS is used for channel estimation in the data demodulation process;

(2) a Phase Tracking Reference Signal (PTRS) corresponding to the data is not transmitted on REs in the corresponding PRBs. The PTRS is used for Phase Noise Compensation (PNC) of a reception signal by a terminal device when demodulating data to obtain more accurate channel estimation.

For example, Common Phase Error (CPE) may affect time domain channel estimation, phase noise on each OFDM symbol may fluctuate randomly, and a channel estimate (usually obtained based on DMRS) obtained on one OFDM symbol may be applied to other OFDM symbols, so as to cause phase error and inter-carrier interference (ICI).

The network device indicates data scheduling information through the DCI, and the method comprises the following steps:

1) a time-frequency resource set occupied by a Physical Downlink Shared Channel (PDSCH) for carrying data indicates that a resource block orthogonal frequency division multiplexing (RB-OFDM) symbol granularity bitmap is used as an indication mode, that is, whether each bit corresponds to a specific RB-OFDM symbol is mapped with data or not;

2) the number of the DMRS ports and the number of the ports associated with the PDSCH are provided, wherein a plurality of orthogonal DMRS ports are supported in the NR, each orthogonal DMRS port corresponds to a specific port number to support pairing transmission of multiple terminal devices (each terminal device occupies different orthogonal DMRS ports respectively), and the number of the DMRS ports corresponds to the number of transmission layers of data, that is, each layer of data corresponds to one DMRS port for channel estimation.

Two DMRS types are supported in NR:

a first DMRS type: a maximum of 8 orthogonal DMRS ports are supported.

A second DMRS type: a maximum of 12 orthogonal DMRS ports are supported.

3) The number of codewords corresponding to the Data carried by the PDSCH may be, for example, each codeword may correspond to an independent Modulation Coding Scheme (MCS), a Redundancy Version (RV), and a New Data transmission indication (New Data indication).

6、PTRS。

The PTRS transmitted by the network device is mapped only within the RBs occupied by the PDSCH, i.e., the PTRS is transmitted only when data is scheduled. The manner of mapping the PTRS to the physical resources on the time-frequency domain includes:

in the time domain: mapping according to a certain time domain density in an OFDM symbol occupied by the PDSCH, wherein the time domain initial position refers to the time domain initial position of the PDSCH, and ensuring that PTRS is not mapped on RE occupied by a DMRS and a channel state information reference signal (CSI-RS) corresponding to the PDSCH.

The time domain density is determined based on an indicated value of an MCS field in DCI scheduling the PDSCH, as shown in table 3 below, where ptrs-MCS1, ptrs-MCS2, ptrs-MCS3, and ptrs-MCS4 are thresholds reported by the terminal device. When the MCS value indicated in the DCI (I shown in Table 3) _MCS) Within different MCS threshold range, corresponding PTRS time domain density (L shown in Table 3)_PT-RS) When the MCS is between PTRS-MCS1 and PTRS-MCS2, the time domain density of 4 indicates that there is one RE occupied by PTRS every 4 OFDM symbols in the time domain; for example, when MCS is between PTRS-MCS3 and PTRS-MCS4, the time domain density of 1 indicates that there is one RE occupied by PTRS in each OFDM symbol in the time domain.

TABLE 3 PTRS time Domain Density

Scheduled MCS	Time domain density (L)_PT-RS)
		I_MCS<ptrs-MCS1	Absence of PT-RS
ptrs-MCS1≤I_MCS<ptrs-MCS2	4
		ptrs-MCS2≤I_MCS<ptrs-MCS3	2
ptrs-MCS3≤I_MCS<ptrs-MCS4	1

Wherein, the MCS values shown in Table 3 within different MCS threshold ranges can be referred to as different MCS levels. For example, I_MCS<When ptrs-MCS1 is designated as MCS level 1, ptrs-MCS1 ≦ I_MCS<When ptrs-MCS2 is designated as MCS level 2, ptrs-MCS2 ≦ I_MCS<When ptrs-MCS3 is designated as MCS level 3, ptrs-MCS3 ≦ I_MCS<And ptrs-MCS4, referred to as MCS level 4. And, the MCS level corresponds to the time domain density of the PTRS one-to-one.

In the frequency domain: mapping according to a certain frequency domain density in the bandwidth occupied by the PDSCH, wherein the frequency domain density is based on the RB number N indicated by the frequency domain resource allocation field in the DCI for scheduling the PDSCH_RBDetermination, as shown in Table 4, wherein N_RB0、N_RB1And reporting the threshold value for the terminal equipment.

TABLE 4 PTRS frequency domain Density

Number of RBs	Frequency domain density (K) _PT-RS)
		N_RB<N_RB0	Absence of PTRS
N_RB0≤N_RB<N_RB1	2
		N_RB1≤N_RB	4

Wherein the number of RBs shown in Table 4 within different threshold ranges of the number of RBs may be referred to as different grades of the number of RBs. E.g. N_RB<N_RB0When called RB number level 1, N_RB0≤N_RB<N_RB1When called RB number level 2, N_RB1≤N_RBAnd is called RB number level 3. And, the RB number level corresponds one-to-one to the frequency domain density of the PTRS.

When the number of RBs N indicated in DCI_RBWhen the corresponding PTRS frequency domain density is within different RB threshold ranges, for example, N changes_RBAt N_RB0And N_RB1In between, the frequency domain density of 2 means that there is one RE occupied by PTRS every 2 RBs. The specific frequency domain resource mapping of the PTRS is determined according to the following formula:

where k is the subcarrier position occupied by the PTRS, in the formula

For the occupied subcarrier offset within one RB,

determined according to table 5. Specifically, the frequency domain position of the PTRS is associated with the DMRS with the smallest port number among the DMRS ports indicated in the DCI by default, and is determined according to the associated DMRS port number and RE offset (resource element offset) configured by higher layer signaling

K_PT-RSFor PTRS frequency domain density, i ═ 0,1,2_RBFor the number of RBs indicated in DCI, n_RNTIDCI adoption for scheduling PDSCHThe sequence value of (2).

It can be seen that the frequency domain resource of the PTRS may dynamically change according to the number of RBs scheduled and the DMRS port indication.

Table 5 PTRS subcarrier position offset values

7. Multi-site cooperative transmission mechanism

In downlink transmission, a terminal device may communicate with multiple network devices at the same time, that is, the terminal device receives data of the multiple network devices at the same time, and this transmission mode is called multi-site coordinated transmission CoMP. The network devices form a cooperation set to communicate with the terminal device simultaneously, the network devices in the cooperation set can be respectively connected with different control nodes, information interaction can be carried out among the control nodes, for example, scheduling strategy information is interacted to achieve the purpose of cooperative transmission, or the network devices in the cooperation set are all connected with the same control node, the control node receives channel state information (such as Channel State Information (CSI) or Reference Signal Received Power (RSRP)) reported by the terminal device and collected by the network device in the cooperation set, and uniformly scheduling the terminal equipment in the cooperation set according to the channel state information of all the terminal equipment in the cooperation set, interacting the scheduling strategy to the network equipment connected with the terminal equipment, and respectively informing the terminal equipment of each network equipment through a DCI signaling carried by the PDCCH. According to a transmission strategy of a plurality of network devices in a coordinated set to a certain terminal device, a CoMP transmission mode comprises:

Dynamic Point Switching (DPS): aiming at the dynamic change of network equipment for data transmission of a certain terminal equipment, selecting the network equipment with better channel condition as much as possible to carry out data scheduling of the current terminal equipment, namely, a plurality of network equipment transmit data to the certain terminal equipment in a time-sharing manner;

coherent transmission (CJT): the method comprises the following steps that a plurality of network devices transmit data for a certain terminal device at the same time, and antennas of the plurality of network devices perform joint precoding, namely, an optimal precoding matrix is selected to perform joint phase and amplitude weighting among the antennas of the plurality of network devices, and the mechanism needs the antennas of the plurality of network devices to perform phase calibration so that accurate phase weighting is performed among a plurality of groups of antennas;

non-coherent transmission (NCJT): the multiple network devices transmit data for a certain terminal device at the same time, and the antennas of the multiple network devices perform independent precoding, that is, each network device independently selects an optimal precoding matrix to perform joint phase and amplitude weighting between the antennas of the network device.

According to the information exchange delay between network devices, CoMP transmission can be divided into Ideal Backhaul (IB) and non-ideal backhaul (NIB).

For IB, the interaction delay is negligible due to the close inter-site distances between network devices or between a network device and a central node, or by means of an optical fiber connection with small transmission loss. At this time, it may be considered that one serving transmission point (serving TRP) exists in the network devices in the cooperating set, or referred to as a serving cell (serving cell) and a serving network device. The service network device is used for scheduling decision of data communication for the terminal device and carrying out MAC layer and physical layer communication with the terminal device. For example, the serving network device determines a time-frequency resource set of the PDCCH and PUSCH or PDSCH of the terminal device according to the scheduling decision, and transmits DCI signaling in the PDCCH, data, Reference Signal (RS) in the PUSCH or PDSCH, and so on.

Except for the serving network device, the remaining network devices in the cooperation set are called coordination transmission point (coordination TRP), or coordination cell (coordination cell), and a coordination network device. The role of the cooperative network device is to perform physical layer communication with the terminal device according to the scheduling decision of the serving network device. For example, the cooperating network devices transmit DCI signaling in PDCCH, data in PUSCH or PDSCH, RS, etc., according to the scheduling decision of the serving network device.

In an IB scenario, the scheduling indication of the serving network device supports 1 DCI transmission, as shown in fig. 2(a), and fig. 2 is a schematic diagram of a terminal device receiving downlink control information according to an embodiment of the present disclosure. The schematic diagram includes a serving network device TRP #1, a cooperative network TRP #2, and a terminal device supporting CoMP.

Wherein, TRP #1 is used as the serving network device to make the scheduling decision of the terminal device and to transmit the scheduling indication using 1 DCI. The DCI may indicate to schedule TRP #1 or TRP #2 for data transmission; it may also be instructed to schedule TRP #1 and TRP #2 for simultaneous data transmission. At this time, scheduling information of two TRPs (TRP #1 and TRP #2 as shown in fig. 2 (a)) will be carried in the DCI.

For example, two codewords correspond to data transmission of two TRPs, respectively, and MCS information corresponding to each codeword corresponds to modulation and coding schemes of data transmitted by two TRPs, respectively. Further, the ports of the DMRS need to be grouped, each group of DMRS ports corresponds to one codeword, and the grouping principle belongs to different DMRS groups according to different Code Division Multiplexing (CDM), as shown in table 5, DMRS ports 1000 and 1001 are the same CDM group and can be used as one DMRS group; DMRS ports 1002, 1003 are the same CDM group, which may be another DMRS group. Because frequency offset calibration is difficult to perform between different TRPs, different TRPs need to be configured with different PTRSs, namely, each DMRS group corresponds to one PTRS. And each PTRS determines a time frequency resource set according to the respective configuration.

According to the codeword-to-layer mapping relationship, each codeword corresponds to a respective DMRS port, DMRS ports corresponding to different codewords are different, and DMRS ports corresponding to different codewords belong to different Code Division Multiplexing (CDM) groups, DMRS ports of different CDM groups occupy different subcarriers in each RB, and DMRS ports of the same CDM group occupy the same subcarrier in each RB.

Different TRPs may have different QCL assumptions, and the QCL assumptions of DMRS ports may be individually issued by different TRPs for DCI notification.

In the IB scenario, the scheduling indication of the serving network device further supports using 2 DCI for transmission, as shown in fig. 2(b), the schematic diagram includes the serving network device TRP #1, the cooperative network device TRP #2, and the terminal device supporting CoMP.

Wherein, 2 pieces of DCI may be respectively transmitted by two network devices (e.g., TRP #1 and TRP #2 shown in fig. 2 (b)), and the 2 pieces of DCI respectively carry scheduling information of PDSCH #1 and PDSCH #2 transmitted by two TRPs, that is, the 2 pieces of DCI respectively carry time-frequency resource set positions occupied by two PDSCHs, associated DMRS port numbers, MCSs, and the like, which increases flexibility of scheduling.

In an NIB scenario, because the inter-site distances between network devices are long, or the network devices are connected by copper wires, the interaction time delay is 2-5ms, and may even reach 30 ms. At this time, if the central control node is still used to control the framework of the multiple cooperative network devices, the performance of the entire system is affected due to failure of the scheduling information caused by the interaction delay. Therefore, in this scenario, a mechanism that multiple cooperative network devices independently schedule data and RSs of the terminal device is introduced, at this time, it is required to support that each cooperative network device independently indicates DCI, and the multiple cooperative network devices determine when to schedule the terminal device according to their own scheduling policies. When multiple cooperative network devices simultaneously schedule the terminal device according to their respective scheduling decisions, the terminal device may simultaneously receive multiple DCIs to schedule their respective PDSCHs (with independent resource allocations and MCSs), as shown in fig. 2 (b). And each DCI schedules at least one code word respectively, each code word corresponds to an independent MCS indication and different DMRS groups, and each DCI corresponds to an independent PTRS port at the moment.

It is noted that, since the DMRS port corresponding to each DCI or each codeword belongs to a different CDM group at this time, the DMRS port corresponding to each DCI or each codeword is frequency-division orthogonal. As can be seen from table 5, the PTRS ports associated with the respective DMRSs occupy different subcarriers, so that the PTRS ports are also frequency-division orthogonal.

Having introduced the basic concepts involved in the present application in detail, the following is a brief description of how two network devices independently transmit scheduling information of their respective PDSCHs in a CoMP transmission scenario with reference to fig. 3. Fig. 3 is a schematic diagram illustrating a plurality of network devices transmitting a plurality of downlink control information. The diagram includes TRP #1, TRP #2, PDSCH #1, and PDSCH # 2.

Specifically, in a CoMP transmission scenario, two network devices respectively send their PDSCHs for carrying their codewords (data of different layers), and simultaneously respectively send their PTRS. In order to ensure the estimation performance of the PTRS and the demodulation performance of the data, the PTRS and the data of each layer are orthogonal, which means that different codewords (data of each layer) are not mapped on a time-frequency resource set occupied by a plurality of PTRS ports.

As shown in fig. 3, it is assumed that two TRPs (TRP #1 and TRP #2 shown in fig. 3) respectively schedule two PDSCHs (PDSCH #1 and PDSCH #2 shown in fig. 3) to occupy the same time-frequency resource set, and within one RB, the two PDSCHs use different DMRS groups to ensure that DMRS frequency domains are orthogonal.

For TRP #1, PDSCH #1 does not map data on the time-frequency resource set occupied by the non-zero power phase tracking reference signal (NZP PTRS) of TRP #1, in order to avoid interference of the PTRS transmitted by TRP #2, TRP #1 is also configured with a zero power phase tracking reference signal (ZP PTRS), the ZP PTRS occupies the same time-frequency resource set as the PTRS transmitted by TRP #2, and PDSCH #1 does not map data on the ZP PTRS. The PDSCH #2 may be configured in the same manner as PDSCH #1, and will not be described again.

For TRP #1, the time-frequency resource set position occupied by ZP PTRS corresponding to PDSCH #1 scheduled by DCI #1 is consistent with the time-frequency resource set position of NZP PTRS transmitted by TRP #2, and the time-frequency resource set position occupied by ZP PTRS needs to be determined based on DCI #2 transmitted by TRP # 2.

Specifically, the terminal device determines the time domain resource density of the ZP PTRS corresponding to the PDSCH #1 based on the MCS level indicated by the DCI #2 (for example, different MCS levels shown in table 3 correspond to different PTRS time domain densities); determining frequency domain resource density of ZP PTRS corresponding to PDSCH #1 based on the scheduling RB number rank indicated by DCI #2 (e.g., referring to different PTRS frequency domain densities corresponding to different RB number ranks shown in table 4); determining the subcarrier position of the ZP PTRS corresponding to the PDSCH #1 based on the DMRS port indication in the DCI #2 (for example, referring to table 5 that different DMRS port numbers correspond to different PTRS subcarrier positions); and determining the time domain starting position of the ZP PTRS corresponding to the PDSCH #1 based on the time domain starting position of the PDSCH in the DCI # 2.

As can be seen from the above, the method for the terminal device to determine the time-frequency resource set of the ZP PTRS corresponding to the PDSCH #1 based on the field in the DCI #2 is similar to the method for determining the time-frequency resource set of the PTRS corresponding to the PDSCH #1 based on the field in the DCI # 1.

In the method for multiple network devices to transmit scheduling information of PDSCH shown in fig. 3, in the above IB scenario, for PDSCH #1 scheduled by TRP #1, the terminal device determines that the time-frequency resource set mapping of PDSCH #1 is determined based on decoding and parsing DCI #2 transmitted by TRP #2, so that when DCI #2 cannot be decoded or parsed correctly, the reception of PDSCH #1 is affected, that is, the decoding of DCI #2 must be completed correctly to determine which REs of PDSCH #1 are unavailable for mapping data, so as to perform correct decoding. Meanwhile, even if DCI #2 can be decoded correctly, the scheme needs to assume that data reception can be performed after both DCIs are decoded and analyzed, which increases the reception delay of PDSCH #1 compared with performing data reception after only DCI #1 is decoded and analyzed. The same applies to TRP # 2.

In the method for transmitting the scheduling information of the PDSCH by the plurality of network devices shown in fig. 3, in the above NIB scenario, the above problem of increasing the reception delay of the PDSCH #1 also exists for the PDSCH #1 scheduled by the TRP # 1. Further, the terminal device may determine the time-frequency resource set of the ZP-PTRS corresponding to the PDSCH #1 based on the DCI #2 detection transmitted by the TRP #2, thereby determining the RE position mapped by the PDSCH # 1. And because the interaction between the TRP #1 and the TRP #2 is semi-static, the TRP #1 cannot acquire the DCI #2 to determine the time-frequency resource set position of the NZP PTRS of the TRP #2, so that the TRP #1 cannot determine the time-frequency resource set position of the ZP PTRS corresponding to the PDSCH #1 through the DCI #2 like the terminal equipment, and the TRP #1 and the terminal equipment generate inconsistency for the PDSCH #1 time-frequency resource set mapping. The same applies to TRP # 2.

In summary, in the method for sending scheduling information of PDSCH by multiple network devices shown in fig. 3, in a CoMP scenario, when two network devices use two DCIs to schedule PDSCH respectively, the position of ZP PTRS corresponding to each PDSCH needs to be determined based on information provided by another DCI. The reliability and delay of PDSCH reception may be affected in the IB scenario. Not only can the reliability and delay of PDSCH reception be affected in the NIB scenario, but also the understanding of ZP PTRS by the network device and the terminal device is inconsistent, thereby affecting the demodulation performance of PDSCH.

In order to solve the above problem, in a CoMP scenario, at least one network device issues a plurality of DCIs to schedule a plurality of PDSCHs respectively, and determine the RE positions mapped by PDSCH # 1. The application provides a method for data transmission, and the position of the ZP PTRS corresponding to each PDSCH is not required to be determined based on information provided by DCI of another network device by indicating the time-frequency resource set of the ZP PTRS corresponding to each PDSCH.

It should be understood that the method for data transmission provided in the embodiment of the present application is not limited to be applied in the CoMP scenario described above, and may also be applied in other communication scenarios where one terminal device receives multiple DCIs transmitted for multiple PDSCHs.

The method for data transmission provided by the embodiment of the present application is described in detail below with reference to fig. 4 to 6.

Fig. 4 is a schematic diagram of a method for data transmission according to an embodiment of the present application, where the schematic diagram includes S110-S130, and these steps are described in detail below.

In the method for data transmission provided in the embodiment of the present application, when the network device determines at least one preset time-frequency resource set carrying the first data and the at least one second data, it may be determined which time-frequency resource sets in the preset time-frequency resource set can be used for mapping the first data and the at least one second data.

It should be understood that the first data and the second data referred to in the present application may be data using different transmission ports; and/or the first data and the second data correspond to different DMRS ports; and/or the first data and the second data are different code words; and/or the first data and the second data are different transmission layers; and/or the spatial filtering information of the first data and the second data are different; and/or the first data and the second data correspond to different transmission blocks; and/or the first data and the second data occupy the same carrier; and/or the first data and the second data occupy the same partial bandwidth.

It is also understood that the first data and the second data are scheduled for different DCIs (first DCI and second DCI). The control resource sets corresponding to the first DCI and the second DCI are different; or, the physical downlink control channel configuration parameters corresponding to the first DCI and the second DCI are different; or, the DMRS ports of the demodulation reference signals indicated by the first DCI and the second DCI belong to different Code Division Multiplexing (CDM) groups; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI are located in the same carrier; or, the set of control resources occupied by the first DCI and the set of control resources occupied by the second DCI occupy the same BWP.

For ease of understanding, the first data and the second data are referred to below as a first codeword and a second codeword.

For example, the terminal device receives 3 codewords (first codeword, second codeword #1, and second codeword # 2). The first codeword is carried in a preset time-frequency resource set #1, the second codeword #1 is carried in a preset time-frequency resource set #2, and the second codeword #2 is carried in a preset time-frequency resource set # 3. The second codeword #1 corresponds to a second set of time frequency resources #1 and the second codeword #2 corresponds to a second set of time frequency resources # 2. Specifically, the preset time-frequency resource set #1 to the preset time-frequency resource set #3 carrying the first codeword, the second codeword #1 and the second codeword #2 may be collectively referred to as remaining time-frequency resource sets in the preset time-frequency resource set.

For another example, multiple CORESET are configured on each carrier or each BWP, where different CORESETs correspond to different TRPs, or different CORESETs are used for carrying DCI 1 and DCI 2. Or, a plurality of CORESET groups 1 for carrying DCI 1 and CORESET group 2 for carrying DCI 2 are further grouped. Meanwhile, the DCI 1 and the DCI 2 may respectively and independently correspond to one detection period, and the terminal may respectively detect the DCI 1 and the DCI 2 according to the two detection periods and the two CORESET groups.

It should be understood that the number of the second code words is not limited in this application, and may be one or more than one second code words. That is to say, in the embodiment of the present application, the number of the codewords received by the terminal device is two or more. In the following, taking the example that the terminal device receives two code words (a first code word and a second code word), the method for data transmission provided in the embodiment of the present application is described.

Specifically, the first set of time-frequency resources may be understood as a first physical downlink shared channel PDSCH, the first codeword may be understood as data carried in the first PDSCH, and similarly, the second set of time-frequency resources may be understood as a second PDSCH, and the second codeword may be understood as data carried in the second PDSCH.

The network device and the terminal device can determine which time frequency resource sets of the preset time frequency resource sets the first codeword and the second codeword are not mapped on. The terminal device can determine that the first codeword and the second codeword are not mapped on which time-frequency resource sets without analyzing the downlink control information DCI corresponding to the first codeword and the second codeword respectively as shown in fig. 3. And the terminal device and the network device in the embodiment of the application determine that the time-frequency resource sets which do not map the first codeword and the second codeword are consistent.

Specifically, the network device can modulate and encode the original data bits to form at least one codeword, and the at least one codeword can be carried on different PDSCHs. In particular, different codewords may correspond to different transmission points TRP, that is to say different codewords may be transmitted by different TRPs; different codewords may correspond to the same TRP and different codewords may be transmitted by the same TRP.

Specifically, the important point in this embodiment of the present application is that the network device can determine which time frequency resource sets in the preset time frequency resource sets the first codeword and the second codeword are not mapped on. The specific process comprises the following steps:

s110, the network equipment determines a second time frequency resource set, wherein the time domain density of the second time frequency resource set is determined according to a preset Modulation Coding Scheme (MCS), and the frequency domain density of the second time frequency resource set is determined according to the preset number of Resource Blocks (RB).

It can be understood that in the embodiment shown in fig. 4, the network device can determine the time-frequency resource set mapped by the ZP PTRS (second time-frequency resource set) corresponding to the codeword by multiplexing the time-frequency density and the frequency-frequency density of the time-frequency resource set (first time-frequency resource set) mapped by the NZP PTRS (hereinafter abbreviated as PTRS) corresponding to the codeword in the prior art. For example, the time-domain density of the set of time-frequency resources is determined based on the MCS as shown in table 3 above, and the frequency-domain density of the set of time-frequency resources is determined based on the number of RBs as shown in table 4 above.

Specifically, the determining of the time domain density of the second time frequency resource set according to the preset MCS means: determining the time domain density of the second time frequency resource set according to a preset MCS and a first transmission capacity value reported by the terminal equipment, wherein the first transmission capacity value reported by the terminal equipment is used for determining the time domain density of a first PTRS corresponding to the first code word; the frequency domain density of the second time frequency resource set according to the present application is determined according to the number of RBs preset, which means: and determining the frequency domain density of the second time-frequency resource set according to the preset number of RBs and a third transmission capability value reported by the terminal equipment, wherein the third transmission capability value reported by the terminal equipment is used for determining the frequency domain density of the first PTRS corresponding to the first codeword.

Specifically, a modulation mode, a coding rate, and the like corresponding to each MCS index value are predefined in the protocol, and the terminal device reports a first transmission capability value x1, x2, where x1, x2 correspond to thresholds of 2 MCS index values, when the MCS index value indicated by the first DCI is less than x1, the time domain density of the corresponding first PTRS is y1, when the MCS index value indicated by the first DCI is greater than x1 and less than x2, the time domain density of the corresponding first PTRS is y2, and when the MCS index value indicated by the first DCI is greater than x2, the time domain density of the corresponding first PTRS is y 3.

Similarly, the frequency domain density corresponding to each RB number value is predefined in the protocol, and the terminal device reports a third transmission capability value y1, y2, where y1, y2 correspond to 2 RB number value thresholds, when the RB number value indicated by the first DCI is less than y1, the frequency domain density of the corresponding first PTRS is z1, when the MCS index value indicated by the first DCI is greater than y1 and less than y2, the frequency domain density of the corresponding first PTRS is z2, and when the MCS index value indicated by the first DCI is greater than y2, the frequency domain density of the corresponding first PTRS is z 3.

Illustratively, the network device further determines subcarriers occupied by the second set of time-frequency resources within one RB; and determining a time domain starting position of the second time frequency resource set.

Further, the network device determining the subcarriers occupied by the second set of time-frequency resources within one RB includes: directly determining the sub-carriers occupied by the second time-frequency resource set in one RB; alternatively, the first and second electrodes may be,

and indirectly determining the subcarriers occupied by the second time frequency resource set in one RB, for example, determining a DMRS port number associated with the second time frequency resource set, wherein the DMRS port number indicates the subcarriers occupied by the second time frequency resource set in one RB.

Further, the time domain starting position of the second set of time frequency resources is not later than the time domain starting position of the first codeword. Exemplarily, the subcarriers occupied by the second set of time-frequency resources within one RB include: and a first subcarrier, wherein the first subcarrier is different from a subcarrier occupied by a DMRS for demodulating the first codeword within one RB.

Specifically, the first subcarrier includes:

if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in an odd number in one RB; further, the first subcarrier in this case is a subcarrier numbered 1 within one RB. The first DMRS is a DMRS port number corresponding to the DMRS for demodulating the first code word;

if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the first subcarrier is a subcarrier preset in an RB with even number; further, the first subcarrier in this case is a subcarrier numbered 0 within one RB.

If the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in subcarriers except subcarriers numbered 0, 1, 6 and 7 in one RB; further, the first subcarrier in this case is a subcarrier numbered 2 within one RB.

If the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004 and 1005, the first subcarrier is a subcarrier preset in one RB and numbered as 0, 1, 6 and 7. Further, the first subcarrier in this case is a subcarrier numbered 0 within one RB.

Exemplarily, the demodulation reference signal DMRS port number associated with the second set of time-frequency resources includes: a second DMRS port number, wherein the second DMRS port number is different from the first DMRS port number corresponding to the DMRS that demodulates the first codeword, and the first and second DMRSs are within different CDM groups.

In a special case, if at least two CDM groups are indicated in the first DCI, the second time-frequency resource set does not exist, and it is not necessary to determine the second time-frequency resource set.

Specifically, the second DMRS port number includes:

if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1002 or 1003;

if the first DMRS is of a first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the second DMRS port number is 1000;

if the first DMRS is of a second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the second DMRS port number is 1004 or 1005;

If the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the second DMRS port number is 1000.

In S110, the network device has already determined a second time-frequency resource set (which may be understood as a time-frequency resource set mapped by the ZP PTRS of the first codeword) corresponding to the first codeword, and determines which time-frequency resource sets cannot map data on the predetermined time-frequency resource set, and needs to perform S120, to determine a first time-frequency resource set, where the first time-frequency resource set is used to map a first PTRS, and the first PTRS is used to demodulate the first data.

It should be understood that, in this application, how the network device determines the first time-frequency resource set in S120 is not limited, and may be determined by using a method for determining a time-frequency resource set of PTRS mapping corresponding to a codeword, which is introduced in the prior art, and details are not described here again.

After determining the first set of time-frequency resources and the second set of time-frequency resources, the network device may send the first codeword to the terminal device, that is, execute S130, and send the first codeword. And the residual time frequency resource set is used for mapping the first code word, and the residual time frequency resource set is a time frequency resource set except the first time frequency resource set and the second time frequency resource set in a preset time frequency resource set. That is, the first codeword is not mapped on the first set of time-frequency resources and the second set of time-frequency resources; or the first code word performs rate matching according to the first time-frequency resource set and the second time-frequency resource set.

In a possible implementation manner, if the network device determines that the flow of the second time-frequency resource set is determined by the network device itself in S110, before performing S130, the method flow shown in fig. 4 further includes S121, where the network device sends a high-level signaling to the terminal device, where the high-level signaling is used to indicate the second time-frequency resource set. That is, the terminal device may determine the second time-frequency resource set based on the received high-level signaling, and determine not to demodulate the first codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set based on the time-frequency resource set mapped by the PTRS corresponding to the received first codeword and the second time-frequency resource set.

In a possible implementation manner, if the method for the network device to determine the second time-frequency resource set in S110 is specified by a protocol, the method flow shown in fig. 4 further includes S122 before executing S130, and the terminal device determines the second time-frequency resource set based on the protocol predefined. The process of determining the second time-frequency resource set by the terminal device is similar to the process of determining the second time-frequency resource set by the network device shown in S110, except that the execution main body is the terminal device, which is not described herein again.

For example, in order that the terminal device can successfully resolve the first codeword, the flow of the method for data transmission shown in fig. 4 further includes: s123, the network device sends a first DCI to the terminal device, where the first DCI is used to schedule first data, and the first DCI is further used to indicate the first DMRS port number.

In a possible implementation manner, the second set of time-frequency resources may be a set of time-frequency resources corresponding to PTRS of other codewords except the first codeword. This is explained in detail below with reference to fig. 5.

Fig. 5 is a schematic diagram of another method for data transmission according to an embodiment of the present application, which includes steps S210-S220, which are described in detail below.

S210, a first time-frequency resource set and at least one second time-frequency resource set are determined, where the remaining time-frequency resource sets are used to map first data and at least one second data, and the remaining time-frequency resource sets are time-frequency resource sets in a preset time-frequency resource set except the first time-frequency resource set and the at least one second time-frequency resource set, where the remaining time-frequency resource sets are, for the first data and the second data, a time-frequency resource set indicated by a first DCI and a time-frequency resource set indicated by a second DCI, respectively.

The first set of time-frequency resources is used for carrying a first Phase Tracking Reference Signal (PTRS), and at least one second set of time-frequency resources is used for carrying at least one second PTRS respectively, wherein the first PTRS is used for demodulating the first data, and the at least one second PTRS is used for demodulating at least one second data respectively.

It is to be understood that the first data and the at least one second data described above are not mapped on the first set of time-frequency resources and the at least one second set of time-frequency resources; or the first data is rate matched according to the first time frequency resource set and at least one second time frequency resource set.

For ease of understanding, the first data and the second data are referred to as a first codeword and a second codeword, and are described from the perspective of one second codeword, but it should be understood that the application is not limited to only one second codeword.

For example, in order that the terminal device can successfully resolve the first codeword and the second codeword, the method flow for data transmission shown in fig. 5 further includes S211 that the network device sends, to the terminal device, a first DCI and a second DCI, where the first DCI is used to indicate the preset set of time-frequency resources and enable the first codeword, and the second DCI is used to indicate the preset set of time-frequency resources carrying the second codeword and enable the second codeword. Or, it can be understood that the first DCI is used for scheduling the first codeword, and the second DCI is used for scheduling the corresponding second codeword; or it may be understood that the first DCI is not used to schedule the second codeword and the second DCI is not used to schedule the first codeword; or it can be understood that the first DCI is only used for scheduling the first codeword and the first DCI is only used for scheduling the second codeword, that is, the MCS corresponding to the first codeword and the second codeword and the indication information of whether to retransmit or not are indicated by the first DCI and the second DCI, respectively.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; or, the control resource set groups corresponding to the first DCI and the second DCI are different; or, the physical downlink control channel configuration parameters corresponding to the first DCI and the second DCI are different; or, the DMRS ports of the demodulation reference signals indicated by the first DCI and the second DCI belong to different Code Division Multiplexing (CDM) groups; or, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI are located in the same carrier; or, the set of control resources occupied by the first DCI and the set of control resources occupied by the second DCI occupy the same BWP.

Specifically, when one DCI may indicate only scheduling information corresponding to one codeword, there is only a case where the codeword is enabled, and when one DCI may indicate scheduling information corresponding to two codewords, the DCI may be used to indicate whether the two codewords are enabled, where enabling the codewords indicates that the transport block is transmitted by using the modulation and coding method indicated by the indication information.

It should be understood that the terms "first" and "second" in the present application are used for distinguishing and explaining, and do not set any limit to the scope of protection of the present application. For example, the first code word and the second code word are only used to distinguish different code words, and do not limit the scope of the present application in any way. For example, the network device determines a first set of time-frequency resources and two second sets of time-frequency resources (second set of time-frequency resources #1 and second set of time-frequency resources # 2). Wherein the second set of time-frequency resources #1 corresponds to the second codeword #1, and the second set of time-frequency resources #2 corresponds to the second codeword # 2. The first codeword is not mapped on a first time-frequency resource set, a second time-frequency resource set #1 and a second time-frequency resource set #2 in a preset time-frequency resource set, or the first codeword is subjected to rate matching according to the first time-frequency resource set, the second time-frequency resource set #1 and the second time-frequency resource set # 2; the second codeword #1 is not mapped on the first time-frequency resource set, the second time-frequency resource set #1 and the second time-frequency resource set #2 in the preset time-frequency resource sets, or the second codeword #1 performs rate matching according to the first time-frequency resource set, the second time-frequency resource set #1 and the second time-frequency resource set # 2; the second codeword #2 is not mapped on the first time-frequency resource set, the second time-frequency resource set #1, and the second time-frequency resource set #2 in the preset time-frequency resource sets, or the second codeword #2 performs rate matching according to the first time-frequency resource set, the second time-frequency resource set #1, and the second time-frequency resource set # 2.

Illustratively, a first set of time-frequency resources is used to map a first PTRS, a corresponding second set of time-frequency resources for the second codeword is used to map a second PTRS, the first PTRS is used to demodulate the first codeword, and the second PTRS is used to demodulate the second codeword. Specifically, the PTRS has been described in detail above and is not repeated here.

Optionally, the first set of time-frequency resources may be understood as a set of time-frequency resources including a set of time-frequency resources occupied by the NZP PTRS corresponding to the first codeword; the second set of time frequency resources may be understood as a set of time frequency resources including a set of time frequency resources occupied by the NZP PTRS corresponding to the second codeword.

First, it should be understood that the first set of time-frequency resources and the second set of time-frequency resources are jointly determined by 4 configuration parameters, i.e. time domain starting position, time domain density, frequency domain position and frequency domain density.

In this embodiment, the network device may determine the first set of time-frequency resources and the second set of time-frequency resources according to preconfigured information, where the preconfigured information indicates at least one configuration parameter of configuration parameters of the first set of time-frequency resources and the second set of time-frequency resources;

alternatively, the first and second electrodes may be,

The network equipment determines a first time-frequency resource set and a second time-frequency resource set and sends a high-level signaling to the terminal equipment, wherein the high-level signaling indicates at least one configuration parameter in configuration parameters of the first time-frequency resource set and the second time-frequency resource set;

alternatively, the first and second electrodes may be,

the network device adds a first field in the first DCI, wherein the first field is used for indicating at least one configuration parameter in configuration parameters of the second time-frequency resource set; and the network device adds a second field in the second DCI, wherein the second field is used for indicating at least one configuration parameter in the configuration parameters of the first set of time-frequency resources.

Several ways of indicating the first set of time-frequency resources based on the pre-configuration information, the higher layer signaling and the second field, respectively, are described below.

The first method is as follows: determining the first set of time-frequency resources according to pre-configuration information, wherein the pre-configuration information indicates configuration parameters of the first set of time-frequency resources, and the configuration parameters at least include one of the following parameters:

a time domain starting position, a time domain density, a frequency domain position, and a frequency domain density.

In particular, the preconfiguration information indicates that the first set of time frequency resources may be understood as a protocol pre-defining the first set of time frequency resources. Namely, the terminal device and the network device can obtain the position of the first time-frequency resource set according to the position of the first time-frequency resource set predefined by the protocol.

When the network device sends the second codeword, the network device may avoid mapping the second codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set based on the predefined position of the first time-frequency resource set and the second time-frequency resource set corresponding to the second codeword;

similarly, when receiving the second codeword, the terminal device may avoid demodulating the second codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set based on the predefined position of the first time-frequency resource set and the second time-frequency resource set corresponding to the second codeword indicated by the second DCI.

In the following, it is briefly described from the perspective of the network device how the network device determines the first set of time-frequency resources according to the preconfigured information.

Specifically, the preconfiguration information indicates that the time domain starting position of the first set of time and frequency resources may be: the pre-configuration information indicates that the time domain starting position of the first time frequency resource set is the time domain starting position of the preset time frequency resource set. And the network device can acquire the time domain starting position of the first time frequency resource set according to the time domain starting position of the preset time frequency resource set.

Specifically, the preconfiguration information indicates that the time domain density of the first set of time-frequency resources comprises:

determining the time domain density of a first time-frequency resource set according to a Modulation and Coding Scheme (MCS) corresponding to the first codeword and a first transmission capability value, wherein the MCS corresponding to the first codeword is indicated by the preconfigured information, and the first transmission capability value is used for determining the time domain density of the first PTRS; alternatively, the first and second electrodes may be,

the pre-configuration information directly indicates a time domain density size of the first set of time frequency resources.

For example, as shown in table 3 related in the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 shown in table 3 based on the MCS corresponding to the first codeword and the first transmission capability value PTRS — MCS reported by the terminal device, table look-up 3 can determine that the time-domain density of the first time-frequency resource set is 4. That is, the manner in which the preconfigured information indicates the time domain density of the first set of time and frequency resources in the present application may be similar to the manner in which the PTRS is mapped to the physical resources on the time-frequency domain as described above. Thus, the time domain density of the first set of time frequency resources can be determined according to the MCS corresponding to the first code word.

Also for example, the preconfiguration information directly indicates that the time domain density of the first set of time frequency resources is 4. The time domain density is N, which indicates that there is an RE occupied by the first time-frequency resource set in every N OFDM symbols in the time domain, and N is a positive integer.

Specifically, the preconfiguration information indicates that the frequency domain density of the first set of time-frequency resources comprises:

determining the frequency domain density of the first time-frequency resource set according to the number level of Resource Blocks (RBs) corresponding to the first code word and a second transmission capability value, wherein the RBs corresponding to the first code word are indicated by preconfigured information, and the second transmission capability value is the frequency domain density reported by a terminal device and used for determining the first PTRS; alternatively, the first and second electrodes may be,

the pre-configuration information directly indicates a frequency domain density size of the first set of time frequency resources.

For example, as shown in table 4 mentioned in the foregoing description, if the number of RBs corresponding to the first codeword is based on the second transmission capability value N reported by the terminal device, the second transmission capability value N is configured according to the first codeword_RBIf the RB number level is determined to be 2 as shown in table 4, then table 4 can determine that the frequency-domain density of the first set of time-frequency resources is 4. That is to say that the first and second electrodes,the manner in which the preconfigured information indicates the frequency-domain density of the first set of time-frequency resources in this application may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. Thus, the frequency-domain density of the first set of time-frequency resources can be determined according to the number of RBs corresponding to the first codeword.

Also for example, the preconfiguration information directly indicates that the frequency domain density of the first set of time frequency resources is 4. The frequency domain density is M, which indicates that there is an RE occupied by the first time-frequency resource set in each M RBs in the frequency domain, and M is a positive integer.

Specifically, the pre-configuration information indicates that the frequency domain position of the first set of time-frequency resources includes:

the pre-configuration information indicates subcarriers occupied by the first time-frequency resource set; alternatively, the first and second electrodes may be,

the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources.

Optionally, how the pre-configuration information indicates the frequency domain position of the first set of time-frequency resources is described in detail in conjunction with tables 6-8.

Firstly, determining a DMRS port number corresponding to a second code word according to the second DCI.

The information shown in table 6 indicates the frequency domain position of the first set of time and frequency resources by indicating the number of subcarriers occupied by the first set of time and frequency resources.

As shown in table 6, if the second DMRS is of the first type and the port number of the second DMRS includes at least one of port numbers 1000 and 1001, the first set of time-frequency resources occupies any one subcarrier of odd-numbered subcarriers in each RB of the preset set of time-frequency resources, where the second DMRS is used to demodulate the second codeword;

if the second DMRS is of the first type and the port number of the second DMRS includes at least one of port numbers 1002 and 1003, the first set of time-frequency resources occupies any one subcarrier of subcarriers with even numbers in each RB in the preset set of time-frequency resources;

If the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1000 and 1001, the first set of time-frequency resources occupies subcarriers of any one of subcarriers, except subcarriers numbered 0, 1, 6, and 7, in each RB in the preset set of time-frequency resources;

if the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the first set of time-frequency resources occupies any one of subcarriers numbered 0, 1, 6, and 7 in each RB in the preset set of time-frequency resources.

For the first type of DMRS, DMRS ports 1000, 1001, 1004, 1005 occupy even subcarriers (

subcarrier numbers

0, 2, 4 … 10), DMRS ports 1002, 1003, 1006, 1007 occupy odd subcarriers (corresponding

subcarrier numbers

1, 3, 5 …); for the DMRS of the second type, the DMRS ports 1000, 1001 occupy subcarriers numbered 0, 1, 6, 7, the DMRS ports 1002, 1003 occupy subcarriers numbered 2, 3, 8, 9, and the DMRS ports 1004, 1005 occupy subcarriers numbered 4, 5, 10, 11.

TABLE 6 frequency domain location of first set of time-frequency resources

Alternatively, the first and second electrodes may be,

specifically, each RB in the preset time-frequency resource set includes 12 subcarriers, which are numbered from 0 to 11 sequentially, and each subcarrier has a number correspondingly. The subcarrier numbers are sequentially numbered from the highest-frequency subcarrier to the lowest-frequency subcarrier within 1 RB, or the subcarrier numbers are sequentially numbered from the lowest-frequency subcarrier to the highest-frequency subcarrier within 1 RB.

The information shown in table 7 indicates the frequency domain position of the first set of time-frequency resources by indicating the DMRS port number associated with the first set of time-frequency resources.

As shown in table 7, if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1000 and 1001, and the DMRS port number associated with the first time-frequency resource set is 1002, the first time-frequency resource set occupies any one of odd-numbered subcarriers in each RB in the preset time-frequency resource set;

if the second DMRS is of the first type and the second DMRS port number includes at least one of port numbers 1002 and 1003, and the DMRS port number associated with the first time-frequency resource set is 1000, the first time-frequency resource set occupies any one subcarrier of subcarriers with even numbers in each RB in the preset time-frequency resource set;

If the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1000 and 1001, and the DMRS port number associated with the first time-frequency resource set is 1004, the first time-frequency resource set occupies any subcarrier of subcarriers, except subcarriers numbered 0, 1, 6, and 7, in each RB of the preset time-frequency resource set

If the second DMRS is of the second type and the second DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, and the DMRS port number associated with the first time-frequency resource set is 1002, the first time-frequency resource set occupies a subcarrier with a number of any one of 0, 1, 6, and 7 in each RB in the preset time-frequency resource set.

TABLE 7 frequency domain location of first set of time-frequency resources

Alternatively, the first and second electrodes may be,

further, as shown in table 8, the occupying, by the first set of time-frequency resources, any one of the odd numbered subcarriers in each RB of the preset set of time-frequency resources includes:

the first time-frequency resource set occupies subcarriers with the number of 1 in each RB in the preset time-frequency resource set;

The first time-frequency resource set occupying any one subcarrier of subcarriers with even numbers in each RB in the preset time-frequency resource set comprises the following steps:

the first time-frequency resource set occupies a subcarrier with the number of 0 in each RB in the preset time-frequency resource set;

the first time-frequency resource set occupying any one of the subcarriers except the subcarriers numbered 0, 1, 6 and 7 in each RB in the preset time-frequency resource set comprises the following steps:

the first time-frequency resource set occupies subcarriers numbered 2 or 4 in each RB in the preset time-frequency resource set;

the first time-frequency resource set occupying any one subcarrier with the number of 0, 1, 6, 7 in each RB in the preset time-frequency resource set comprises the following steps:

and the first time-frequency resource set occupies the sub-carrier numbered 0 in each RB in the preset time-frequency resource set.

TABLE 8 frequency domain location of first set of time frequency resources

In a manner equivalent to that the protocol reserves various parameters of the first time-frequency resource set, the terminal device may also determine the first time-frequency resource set based on the protocol, and the specific determination manner is similar to that of the network device determining the first time-frequency resource set, and is not described herein again.

The second method comprises the following steps: the network equipment sends a high-level signaling to the terminal equipment, wherein the high-level signaling indicates the configuration parameters of the first time-frequency resource set, and the configuration parameters at least comprise one of the following parameters:

Specifically, the time domain starting position of the higher layer signaling indication first set of time and frequency resources may be: and the high-level signaling indicates that the time domain starting position of the first time-frequency resource set is the time domain starting position of the preset time-frequency resource set. And the network device can acquire the time domain starting position of the first time frequency resource set according to the time domain starting position of the preset time frequency resource set.

Specifically, the higher layer signaling indicates the time domain density of the first set of time-frequency resources includes:

determining the time domain density of a first time-frequency resource set according to a Modulation and Coding Scheme (MCS) corresponding to the first codeword and a first transmission capability value, wherein the MCS corresponding to the first codeword is indicated by the high-level signaling, and the first transmission capability value is used for determining the time domain density of the first PTRS; alternatively, the first and second electrodes may be,

the high layer signaling directly indicates the time domain density size of the first set of time frequency resources.

For example, as shown in table 3 related to the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 based on the MCS corresponding to the first codeword and the first transmission capability value PTRS — MCS reported by the terminal device, the time-domain density of the first time-frequency resource set is 4. That is, the higher layer signaling in this application indicates that the time domain density of the first set of time and frequency resources may be similar to the way in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. Thus, the time domain density of the first set of time frequency resources can be determined according to the MCS corresponding to the first code word.

Also for example, the higher layer signaling directly indicates that the time domain density of the first set of time frequency resources is 4.

The time domain density is N, which means that the first set of time-frequency resources occupies one RE in every N OFDM symbols in the time domain, and N is a positive integer.

Specifically, the higher layer signaling indicates the frequency domain density of the first set of time-frequency resources comprises:

determining the frequency domain density of the first time-frequency resource set according to the number level of Resource Blocks (RBs) corresponding to the first codeword and a second transmission capability value, wherein the RBs corresponding to the first codeword is indicated by a high-level signaling, and the second transmission capability value is the frequency domain density reported by a terminal device and used for determining the first PTRS; alternatively, the first and second electrodes may be,

The higher layer signaling directly indicates the frequency domain density size of the first set of time frequency resources.

For example, as shown in table 4 mentioned in the foregoing description, if the number of RBs corresponding to the first codeword is based on the second transmission capability value N reported by the terminal device, the second transmission capability value N is configured according to the first codeword_RBAnd when the RB quantity level is determined to be 2, the frequency domain density of the first time-frequency resource set is 4. That is, the frequency-domain density of the first set of time-frequency resources indicated by the higher layer signaling in the present application may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. Thus, the frequency-domain density of the first set of time-frequency resources can be determined according to the number of RBs corresponding to the first codeword.

Also for example, the higher layer signaling directly indicates that the frequency domain density of the first set of time frequency resources is 4.

The frequency domain density is M, which indicates that the first time-frequency resource set occupies one RE in each M RBs in the frequency domain, and M is a positive integer.

Specifically, the higher layer signaling indicates the frequency domain position of the first set of time-frequency resources includes:

the high-level signaling indicates the subcarriers occupied by the first time-frequency resource set; alternatively, the first and second electrodes may be,

and the high-layer signaling indicates the port number of a demodulation reference signal (DMRS) associated with the first time-frequency resource set.

Optionally, how the high layer signaling indicates the frequency domain position of the first set of time-frequency resources is described in detail in conjunction with tables 6-8 shown above.

Shown in table 6 is that the higher layer signaling indicates the frequency domain position of the first set of time and frequency resources by indicating the number of subcarriers occupied by the first set of time and frequency resources.

Shown in table 7 is that the higher layer signaling indicates the frequency domain position of the first set of time-frequency resources by indicating the DMRS port number associated with the first set of time-frequency resources.

Further, the first time-frequency resource set occupies one subcarrier in each RB in the preset time-frequency resource set, as shown in table 8, which is not repeated here.

In the second mode, it is equivalent to that the network device first determines various parameters of the first time-frequency resource set, and notifies the terminal device of the various parameters of the first time-frequency resource set through the high-level signaling before sending the codeword, so that the terminal device can determine the first time-frequency resource set based on the high-level signaling, and the specific determination mode is how to indicate the various parameters of the first time-frequency resource set by the high-level signaling, which is not described herein again.

The third method comprises the following steps: a second DCI sent by the network device to the terminal device includes a second field, where the second field is used to indicate a configuration parameter of the first set of time and frequency resources, where the configuration parameter at least includes one of the following parameters:

Specifically, the second field indicates that the time domain starting position of the first set of time and frequency resources may be: the second field indicates that the time domain starting position of the first time frequency resource set is the time domain starting position of the preset time frequency resource set.

Specifically, the second field indicating the time domain density of the first set of time frequency resources comprises:

determining the time domain density of a first time-frequency resource set according to the Modulation and Coding Scheme (MCS) corresponding to the first codeword and a first transmission capability value, wherein the MCS corresponding to the first codeword is indicated by the second field, and the first transmission capability value is used for determining the time domain density of the first PTRS;

optionally, the second field is an original field in the second DCI, for example, the second DCI includes two MCS fields, one of the two MCS fields is used to indicate an MCS level corresponding to the second codeword, and the other MCS field (the second field) is used to indicate an MCS level corresponding to the first codeword.

Alternatively, the second field directly indicates a time domain density size of the first set of time frequency resources.

For example, as shown in table 3 related to the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 based on the MCS corresponding to the first codeword and the first transmission capability value PTRS — MCS reported by the terminal device, the time-domain density of the first time-frequency resource set is 4. That is, the second field in this application indicates that the time domain density of the first set of time and frequency resources may be similar to the manner in which the PTRS is mapped to physical resources on the time-frequency domain as described above. Thus, the time domain density of the first set of time frequency resources can be determined according to the MCS corresponding to the first code word.

Also for example, the second field occupies two bits, and the composition of different values on the two bits is used to directly indicate that the time domain density of the first set of time frequency resources is 4. As shown in table 9.

TABLE 9 second field indicates time domain density

It should be understood that table 9 is only an example, and there may be other possible corresponding relationships between the second field and the time domain density of the first set of time frequency resources, which are not illustrated herein. For example, the second field may be a 3-bit composition.

The second field indicates a position relationship of a time-frequency resource set occupied by the first codeword and the second codeword, respectively, where the position relationship includes at least one of:

The time domain resources and/or frequency domain resources occupied by the first code words and the second code words are completely overlapped;

the time domain resources and/or frequency domain resources occupied by the first code words and the second code words are partially overlapped;

the time domain resources and/or frequency domain resources occupied by the first code word and the second code word respectively do not overlap.

The first code word and the second code word adopt different transmission ports; or, the first codeword and the second codeword correspond to different DMRS ports; or, the first codeword and the second codeword are different codewords; or, the first codeword and the second codeword correspond to different TBs; or, the first codeword and the second codeword correspond to different transmission layers; or, the spatial filtering information of the first codeword and the second codeword are different; or, the first codeword and the second codeword occupy the same carrier; or, the first codeword and the second codeword occupy the same BWP.

Optionally, the first codeword and the second codeword are located in the same time unit, where the time unit is a slot, or an OFDM symbol, or a CDMA symbol.

Optionally, the first codeword and the second codeword are scheduled by different DCIs (first DCI and second DCI), respectively.

Optionally, the first DCI is not used for scheduling the second codeword, and the second DCI is not used for scheduling the first codeword;

Optionally, the first DCI is only used for scheduling the first codeword, and the first DCI is only used for scheduling the second codeword.

Further, the positional relationship is used to determine a frequency domain density of the first set of time-frequency resources: if the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI;

if the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to X, the X is determined according to the second field or determined according to the high-level configuration parameters, and the value of the X is 2 or 4; alternatively, the first and second electrodes may be,

the second field directly indicates a frequency domain density size of the first set of time-frequency resources.

Illustratively, the second field occupies two bits, the second field for indicating a frequency domain density of the first set of time-frequency resources comprises:

when the second field is '00', the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are completely overlapped, and the frequency domain density of the first time frequency resource set is equal to that of the second time frequency resource set; alternatively, the first and second electrodes may be,

When the first field is '01', the time domain resources and/or the frequency domain resources occupied by the first code word and the second code word are completely not overlapped, and the frequency domain density of the first time-frequency resource set is an arbitrary value; alternatively, the first and second electrodes may be,

when the first field is '10', the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are partially overlapped, and the frequency domain density of the first time frequency resource set is 4; alternatively, the first and second electrodes may be,

when the first field is '11', the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are partially overlapped, and the frequency domain density of the first time frequency resource set is 2. As shown in tables 10 and 11.

Table 10 second field indicates frequency domain density

Table 11 field description of the second field

Table 12 field description of the second field

It should be understood that the table 10 is only an example, and the second field may have other possible corresponding relations with the frequency density of the first set of time-frequency resources, which is not illustrated here. For example, the second field may be a 3-bit composition.

The second field indicates the sub-carrier occupied by the first time-frequency resource set; alternatively, the first and second electrodes may be,

the second field indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources.

Optionally, how the second field indicates the frequency domain position of the first set of time-frequency resources is described in detail in conjunction with tables 6-8 shown above.

Shown in table 6 is a second field indicating the frequency domain location of the first set of time and frequency resources by indicating the number of subcarriers occupied by the first set of time and frequency resources.

Shown in table 7 is that the second field indicates the frequency domain position of the first set of time-frequency resources by indicating the DMRS port number associated with the first set of time-frequency resources.

It should also be understood that the second field may indicate only a portion of the 4 configuration parameters of the first set of time-frequency resources described above, and other configuration parameters may be determined in combination with the manner one and the manner two referred to above.

For example, the second field included in the second DCI indicates only the frequency domain density of the first set of time-frequency resources (as shown in tables 10 and 11). Then, the time domain starting position, the time domain density, and the frequency domain position of the first set of time frequency resources may be determined based on the first or second manner described above; alternatively, the time domain starting position, the time domain density, and the frequency domain position of the first set of time-frequency resources may be determined by multiplexing existing fields in the second DCI (such as the MCS field, the DMRS port indication field, and the like in the second DCI as described above).

It should also be understood that the above-mentioned methods of determining at least one of the 4 configuration parameters of the time domain starting position, the time domain density, the frequency domain position and the frequency domain density of the first set of time and frequency resources in the first, second and third manners may be used in combination.

For example, the time domain starting position, the time domain density, and the frequency domain position of the first set of time and frequency resources are determined based on the manner shown in the first manner, and the frequency domain density of the first set of time and frequency resources is determined based on the manner shown in the third manner. For example, the time domain starting position, the time domain density, and the frequency domain position of the first set of time and frequency resources are determined based on the manner shown in the second manner, and the frequency domain density of the first set of time and frequency resources is determined based on the manner shown in the third manner. Various combinations are possible and will not be described in detail here.

The above-mentioned first to third ways describe in detail how to determine the time domain starting position, the time domain density, the frequency domain position and the frequency domain density of the first set of time frequency resources. For the case that the terminal device needs to correctly analyze the DCI corresponding to each of the multiple codewords, the method for data transmission in this embodiment of the application indicates the configuration information of the first time-frequency resource set through the protocol predefinition, the high-level signaling indication, or the second field, so that the terminal device can analyze the second time-frequency resource set mapped by the second PTRS based on the second DCI when receiving the second codeword, and determine the first time-frequency resource set based on the configuration information of the first time-frequency resource set indicated by the protocol predefinition, the high-level signaling indication, or the second field, thereby avoiding analyzing the second codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set.

It should be understood that ways one to three are described taking one second codeword as an example, and the case for a plurality of second codewords (second codeword # 1-second codeword # X) is similar to the above. That is, the network device as well as the terminal device can indicate, for the second codeword #1, at least one second set of time-frequency resources (second set of time-frequency resources # 2-second set of time-frequency resources # X) and configuration information of the first set of time-frequency resources based on the protocol predefinition, the higher layer signaling indication or the second field.

Similar to the determination of the time domain starting position, the time domain density, the frequency domain position and the frequency domain density of the first set of time frequency resources described above. For the first codeword, mapping on the first set of time-frequency resources and the at least one second set of time-frequency resources in the preset set of time-frequency resources needs to be avoided. That is, on the premise that the first DCI indicates that the first set of time-frequency resources is used for mapping the first PTRS, the location of at least one second set of time-frequency resources also needs to be indicated.

Several ways of indicating the second set of time-frequency resources based on the pre-configuration information, the higher layer signaling and the first field are described below, respectively.

The first method is as follows: determining the second set of time-frequency resources according to pre-configuration information, wherein the pre-configuration information indicates configuration parameters of the second set of time-frequency resources, and the configuration parameters at least include one of the following parameters:

In particular, the preconfiguration information indicates that the second set of time frequency resources may be understood as a protocol predefined second set of time frequency resources. That is, the terminal device and the network device can obtain the position of the second time-frequency resource set according to the position of the second time-frequency resource set predefined by the protocol.

When the network device sends the first codeword, the network device may avoid mapping the first codeword on the first time-frequency resource set and the at least one second time-frequency resource set in the preset time-frequency resource sets based on the predefined position of the at least one second time-frequency resource set and the first time-frequency resource set;

similarly, when receiving the first codeword, the terminal device may avoid demodulating the first codeword on the first time-frequency resource set and the at least one second time-frequency resource set in the preset time-frequency resource set based on the predefined location of the at least one second time-frequency resource set and the first time-frequency resource set indicated by the first DCI.

In the following, it is briefly explained from the perspective of the network device how the network device determines the second set of time-frequency resources according to the preconfigured information.

Specifically, the preconfiguration information indicates that the time domain starting position of the second set of time-frequency resources may be: the pre-configuration information indicates that the time domain starting position of the second time frequency resource set is the time domain starting position of the preset time frequency resource set. And the network device can acquire the time domain starting position of the second time frequency resource set according to the time domain starting position of the preset time frequency resource set.

Specifically, the preconfiguration information indicates that the time domain density of the second set of time frequency resources comprises:

determining the time domain density of a second time frequency resource set according to a Modulation Coding Scheme (MCS) corresponding to the second code word and a third transmission capability value, wherein the MCS corresponding to the second code word is indicated by the pre-configuration information, and the third transmission capability value is used for determining the time domain density of the first PTRS; alternatively, the first and second electrodes may be,

the preconfiguration information directly indicates a time domain density size of the second set of time frequency resources.

For example, as shown in table 3 related to the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 shown in table 3 based on the MCS corresponding to the second codeword and the third transmission capability value PTRS — MCS reported by the terminal device, table look-up 3 may determine that the time-domain density of the second time-frequency resource set is 4. That is, the manner in which the preconfigured information indicates the time domain density of the second time frequency resource set in the present application may be similar to the manner in which the PTRS is mapped to the physical resource in the time frequency domain. Thus, the time domain density of the second time frequency resource set can be determined according to the MCS corresponding to the second code word.

Also for example, the preconfiguration information directly indicates that the time-domain density of the second set of time-frequency resources is 4. The time domain density is N, which indicates that there is an RE occupied by the second time-frequency resource set in every N OFDM symbols in the time domain, and N is a positive integer.

Specifically, the preconfiguration information indicates that the frequency domain density of the second set of time-frequency resources comprises:

determining the frequency domain density of the second time-frequency resource set according to the number level of Resource Blocks (RBs) corresponding to the second codeword and a fourth transmission capability value, wherein the RBs corresponding to the second codeword is indicated by the pre-configuration information, and the fourth transmission capability value is the frequency domain density reported by the terminal equipment and used for determining the first PTRS; alternatively, the first and second electrodes may be,

the pre-configuration information directly indicates a frequency domain density size of the second set of time-frequency resources.

For example, as shown in table 4 mentioned in the above-mentioned time-frequency resource set for configuring PTRS, if the number of RBs corresponding to the second codeword is based on the fourth transmission capability value N reported by the terminal device_RBIf the RB number level is determined to be 2 as shown in table 4, then table 4 can determine that the frequency-domain density of the second time-frequency resource set is 4. That is, the manner in which the preconfigured information indicates the frequency-domain density of the second time-frequency resource set in the present application may be similar to the manner in which the PTRS is mapped to the physical resource in the time-frequency domain. In this way, the frequency domain density of the second set of time frequency resources may be determined according to the number of RBs corresponding to the second codeword.

Also for example, the preconfiguration information directly indicates that the frequency domain density of the second set of time-frequency resources is 4. The frequency domain density is M, which indicates that there is one RE occupied by the second time-frequency resource set in each M RBs in the frequency domain, and M is a positive integer.

Specifically, the pre-configuration information indicating the frequency domain location of the second set of time-frequency resources includes:

the pre-configuration information indicates the sub-carrier occupied by the second time frequency resource set; alternatively, the first and second electrodes may be,

the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the second time frequency resource set.

Optionally, how the pre-configuration information indicates the frequency domain location of the second set of time-frequency resources is detailed in connection with tables 13-15.

Firstly, determining a first demodulation reference signal (DMRS) port number corresponding to a first code word according to the first DCI.

Shown in table 13 is that the preconfiguration information indicates the frequency domain location of the second set of time frequency resources by indicating the number of subcarriers occupied by the second set of time frequency resources.

As shown in table 13, if the first DMRS is of the first type and the first DMRS port number includes at least one of port numbers 1000 and 1001, the second set of time-frequency resources occupies any one of odd numbered subcarriers in each RB of the preset set of time-frequency resources, where the first DMRS is used to demodulate the first codeword;

if the first DMRS is of the first type and the port number of the first DMRS comprises at least one of port numbers 1002 and 1003, the second time-frequency resource set occupies any subcarrier of subcarriers with even numbers in each RB in the preset time-frequency resource set;

If the first DMRS is of the second type and the first DMRS port number comprises at least one of the port numbers 1000 and 1001, the second time frequency resource set occupies subcarriers of any one of the subcarriers, except the subcarriers with the numbers of 0, 1, 6 and 7, in each RB in the preset time frequency resource set;

if the first DMRS is of the second type and the first DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, the second set of time-frequency resources occupies any one of subcarriers numbered 0, 1, 6, and 7 in each RB in the preset set of time-frequency resources.

subcarrier numbers

TABLE 13 frequency domain locations of the second set of time-frequency resources

Alternatively, the first and second electrodes may be,

Shown in table 14 is that the preconfigured information indicates the frequency domain location of the second set of time frequency resources by indicating the DMRS port number associated with the second set of time frequency resources.

As shown in table 14, if the first DMRS is of the first type and the first DMRS port number includes at least one of port numbers 1000 and 1001, and the DMRS port number associated with the second time-frequency resource set is 1002, the second time-frequency resource set occupies any one of odd-numbered subcarriers in each RB in the preset time-frequency resource set;

if the first DMRS is of the first type and the first DMRS port number includes at least one of port numbers 1002 and 1003, and the DMRS port number associated with the second time-frequency resource set is 1000, the second time-frequency resource set occupies any one of subcarriers with even numbers in each RB in the preset time-frequency resource set;

If the first DMRS is of the second type and the first DMRS port number includes at least one of port numbers 1000 and 1001, and the DMRS port number associated with the second time frequency resource set is 1004, the second time frequency resource set occupies any one of subcarriers, except subcarriers numbered 0, 1, 6, and 7, in each RB in the preset time frequency resource set

If the first DMRS is of the second type and the first DMRS port number includes at least one of port numbers 1002, 1003, 1004, and 1005, and the DMRS port number associated with the second time-frequency resource set is 1002, the second time-frequency resource set occupies a subcarrier with a number of any one of 0, 1, 6, and 7 in each RB in the preset time-frequency resource set.

TABLE 14 frequency domain locations of the second set of time-frequency resources

Alternatively, the first and second electrodes may be,

further, as shown in table 15, the occupying, by the second set of time-frequency resources, any one of the odd numbered subcarriers in each RB in the preset set of time-frequency resources by the second set of time-frequency resources includes:

the second time frequency resource set occupies subcarriers with the number of 1 in each RB in the preset time frequency resource set;

The second time-frequency resource set occupying any one subcarrier of subcarriers with even numbers in each RB in the preset time-frequency resource set comprises the following steps:

the second time frequency resource set occupies the subcarrier with the number of 0 in each RB in the preset time frequency resource set;

the second time frequency resource set occupying any subcarrier except the subcarriers numbered 0, 1, 6 and 7 in each RB in the preset time frequency resource set comprises the following steps:

the second time frequency resource set occupies the subcarrier with the number of 2 in each RB in the preset time frequency resource set;

the second time frequency resource set occupying any one subcarrier with the number of 0, 1, 6, 7 in each RB in the preset time frequency resource set comprises the following steps:

and the second time frequency resource set occupies the subcarrier with the number of 0 in each RB in the preset time frequency resource set.

TABLE 15 frequency domain locations of the second set of time-frequency resources

In a manner equivalent to that the protocol reserves various parameters of the second time-frequency resource set, the terminal device may also determine the second time-frequency resource set based on the protocol, and the specific determination manner is similar to that of the network device determining the second time-frequency resource set, and is not described herein again.

The second method comprises the following steps: the network device sends a high-level signaling to the terminal device, the high-level signaling indicates a configuration parameter of the second time-frequency resource set, and the configuration parameter at least comprises one of the following parameters:

Specifically, the time domain starting position of the second time-frequency resource set indicated by the higher layer signaling may be: the high-level signaling indicates that the time domain starting position of the second time frequency resource set is the time domain starting position of the preset time frequency resource set. And the network device can acquire the time domain starting position of the second time frequency resource set according to the time domain starting position of the preset time frequency resource set.

Specifically, the higher layer signaling indicates the time domain density of the second time frequency resource set, including:

determining the time domain density of a second time frequency resource set according to a Modulation Coding Scheme (MCS) corresponding to the second code word and a third transmission capability value, wherein the MCS corresponding to the second code word is indicated by the high-level signaling, and the third transmission capability value is used for determining the time domain density of the first PTRS; alternatively, the first and second electrodes may be,

the high layer signaling directly indicates the time domain density size of the second set of time frequency resources.

For example, as shown in table 3 related to the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 based on the MCS corresponding to the second codeword and the third transmission capability value PTRS — MCS reported by the terminal device, the time-domain density of the second time-frequency resource set is 4. That is, the time domain density of the second time frequency resource set indicated by the higher layer signaling in the present application may be similar to the manner of mapping the PTRS to the physical resource in the time frequency domain. Thus, the time domain density of the second time frequency resource set can be determined according to the MCS corresponding to the second code word.

The time domain density is N, which means that a second time-frequency resource set in every N OFDM symbols in the time domain occupies one RE, and N is a positive integer.

Specifically, the higher layer signaling indicates the frequency domain density of the second time-frequency resource set includes:

determining the frequency domain density of the second time-frequency resource set according to the number level of Resource Blocks (RBs) corresponding to the second codeword and a fourth transmission capability value, wherein the RBs corresponding to the second codeword is indicated by a high-level signaling, and the fourth transmission capability value is the frequency domain density reported by a terminal device and used for determining the first PTRS; alternatively, the first and second electrodes may be,

The high layer signaling directly indicates the frequency domain density size of the second set of time frequency resources.

For example, as shown in table 4 mentioned in the above-mentioned time-frequency resource set for configuring PTRS, if the number of RBs corresponding to the second codeword is based on the fourth transmission capability value N reported by the terminal device_RBAnd when the RB number level is determined to be 2, the frequency domain density of the second time frequency resource set is 4. That is, the frequency-domain density of the second time-frequency resource set indicated by the higher layer signaling in the present application may be similar to the manner of mapping the PTRS to the physical resources in the time-frequency domain described above. In this way, the frequency domain density of the second set of time frequency resources may be determined according to the number of RBs corresponding to the second codeword.

Also for example, the higher layer signaling directly indicates that the frequency domain density of the second set of time-frequency resources is 4.

Specifically, the indicating, by the higher layer signaling, the frequency domain position of the second time-frequency resource set includes:

the high-level signaling indicates the subcarrier occupied by the second time-frequency resource set; alternatively, the first and second electrodes may be,

and the high-layer signaling indicates the DMRS port number associated with the second time frequency resource set.

Optionally, how the high layer signaling indicates the frequency domain location of the second set of time-frequency resources is described in detail in conjunction with tables 13-15 shown above.

Firstly, determining a second demodulation reference signal (DMRS) port number corresponding to a first code word according to the first DCI.

Table 13 shows that the high layer signaling indicates the frequency domain position of the second time frequency resource set by indicating the number of the subcarrier occupied by the second time frequency resource set.

Shown in table 14 is that the higher layer signaling indicates the frequency domain position of the second time frequency resource set by indicating the DMRS port number associated with the second time frequency resource set.

Further, the second time-frequency resource set occupies one subcarrier in each RB in the preset time-frequency resource set, as shown in table 15, which is not repeated here.

In the second mode, it is equivalent to that the network device first determines various parameters of the second time-frequency resource set, and notifies the terminal device of various parameters of the second time-frequency resource set through the high-level signaling before sending the codeword, so that the terminal device can determine the second time-frequency resource set based on the high-level signaling, and the specific determination mode, that is, how the above-described high-level signaling indicates various parameters of the second time-frequency resource set, is not repeated here.

The third method comprises the following steps: the first DCI sent by the network device to the terminal device includes a first field, where the first field is used to indicate a configuration parameter of the second set of time-frequency resources, where the configuration parameter at least includes one of the following parameters:

In particular, the first field indicating the time domain starting position of the second set of time-frequency resources may be: the first field indicates that the time domain starting position of the second time frequency resource set is the time domain starting position of the preset time frequency resource set.

Specifically, the first field indicating the time domain density of the second set of time frequency resources comprises:

determining the time domain density of a second time frequency resource set according to a Modulation Coding Scheme (MCS) corresponding to the second code word and a third transmission capability value, wherein the MCS corresponding to the second code word is indicated by the first field, and the third transmission capability value is used for determining the time domain density of the first PTRS;

optionally, the first field is an original field in the first DCI, for example, the first DCI includes two MCS fields, one of the two MCS fields is used to indicate an MCS level corresponding to the second codeword, and the other MCS field (the first field) is used to indicate an MCS level corresponding to the second codeword.

Alternatively, the first field directly indicates a time-domain density size of the second set of time-frequency resources.

For example, as shown in table 3 related to the time-frequency resource set configured with PTRS introduced above, if the MCS level is determined to be 2 based on the MCS corresponding to the second codeword and the third transmission capability value PTRS — MCS reported by the terminal device, the time-domain density of the second time-frequency resource set is 4. That is, the first field indicates that the time-domain density of the second set of time-frequency resources may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain. Thus, the time domain density of the second time frequency resource set can be determined according to the MCS corresponding to the second code word.

Also for example, the first field occupies two bits, the composition of different values on the two bits, for directly indicating that the time-domain density of the second set of time-frequency resources is 4. As shown in table 16.

Table 16 first field indicates time domain density

It should be understood that the table 16 is only an example, and there may be other possible corresponding relations between the time-domain density of the first field and the time-frequency resource of the second set, and the description is not repeated here. For example, the first field may be a 3-bit composition.

The first field indicates a location relationship of a set of time-frequency resources occupied by the first codeword and the second codeword, respectively, the location relationship including at least one of:

Further, the positional relationship is used to determine a frequency domain density of the second set of time-frequency resources:

if the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively are completely overlapped, the frequency domain density of the second time-frequency resource set is equal to the frequency domain density of the first time-frequency resource set, wherein the frequency domain density of the first time-frequency resource set is based on the frequency domain resource indication information in the first DCI;

if the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the first field or the high-level configuration parameters, and the value of the Y is 2 or 4;

alternatively, the first field directly indicates a frequency-domain density size of the second set of time-frequency resources.

Illustratively, the first field occupies two bits, the first field for indicating a frequency-domain density of the second set of time-frequency resources comprises:

when the first field is '00', the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are completely overlapped, and the frequency domain density of the second time frequency resource set is equal to that of the first time frequency resource set; alternatively, the first and second electrodes may be,

When the first field is '01', the time domain resources and/or the frequency domain resources occupied by the first code word and the second code word are completely not overlapped, and the frequency domain density of the second time frequency resource set is an arbitrary value; alternatively, the first and second electrodes may be,

when the first field is '10', the time domain resources and/or frequency domain resources occupied by the first code word and the second code word are partially overlapped, and the frequency domain density of the second time frequency resource set is 4; alternatively, the first and second electrodes may be,

when the first field is '11', the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword are partially overlapped, and the frequency domain density of the second time frequency resource set is 2. As shown in tables 17 and 18.

Table 17 the first field indicates the frequency domain density

Table 18 field description of the first field

Table 19 field description of the first field

It should be understood that the table 17 is only an example, and there may be other possible corresponding relations between the frequency density sizes of the first field and the second set of time-frequency resources, which are not illustrated here. For example, the first field may be a 3-bit composition.

The first field indicates subcarriers occupied by the second time-frequency resource set; alternatively, the first and second electrodes may be,

the first field indicates a demodulation reference signal (DMRS) port number associated with the second set of time-frequency resources.

Optionally, how the first field indicates the frequency domain location of the second set of time-frequency resources is described in detail in conjunction with tables 13-15 shown earlier.

Shown in table 13 is that the first field indicates the frequency domain location of the second set of time-frequency resources by indicating the number of subcarriers occupied by the second set of time-frequency resources.

Shown in table 13 is that the first field indicates the frequency domain location of the second set of time frequency resources by indicating the DMRS port number associated with the second set of time frequency resources.

As shown in table 13, if the first DMRS is of the first type and the first DMRS port number includes at least one of port numbers 1000 and 1001, and the DMRS port number associated with the second time-frequency resource set is 1002, the second time-frequency resource set occupies any one of odd-numbered subcarriers in each RB in the preset time-frequency resource set;

Further, the second time-frequency resource set occupies one subcarrier in each RB in the preset time-frequency resource set, as shown in table 14, which is not repeated here.

It should also be understood that the first field may indicate only a part of the 4 configuration parameters of the second set of time-frequency resources, and other configuration parameters may be determined in combination with the manner one and the manner two mentioned above.

For example, the first field included in the first DCI only indicates the frequency domain density of the second set of time-frequency resources (as shown in tables 10 and 11). Then, the time domain starting position, the time domain density and the frequency domain position of the second time frequency resource set may be determined based on the above-mentioned first or second manner; alternatively, the time domain starting position, the time domain density, and the frequency domain position of the second set of time-frequency resources may be determined by multiplexing existing fields in the first DCI (such as the MCS field, the DMRS port indication field, and the like in the first DCI as described above).

It should also be understood that the above-mentioned methods of determining at least one of 4 configuration parameters of the time domain starting position, the time domain density, the frequency domain position, and the frequency domain density of the second time-frequency resource set in the first, second, and third manners may be used in combination.

For example, the time domain starting position, the time domain density, and the frequency domain position of the second time frequency resource set are determined based on the manner shown in the first manner, and the frequency domain density of the second time frequency resource set is determined based on the manner shown in the third manner. For example, the time domain starting position, the time domain density, and the frequency domain position of the second time frequency resource set are determined based on the manner shown in the second manner, and the frequency domain density of the second time frequency resource set is determined based on the manner shown in the third manner. Various combinations are possible and will not be described in detail here.

The above-mentioned first to third ways describe in detail how to determine the time domain starting position, the time domain density, the frequency domain position and the frequency domain density of the second time frequency resource set. For the case that the terminal device needs to correctly analyze the DCI corresponding to each of the multiple codewords, the method for data transmission in this embodiment of the application enables the terminal device to analyze the second time-frequency resource set mapped to the first PTRS based on the first DCI when receiving the first codeword through the protocol predefinition, the high layer signaling indication, or the configuration information of the second time-frequency resource set indicated by the first field, and determine the second time-frequency resource set based on the protocol predefinition, the high layer signaling indication, or the configuration information of the second time-frequency resource set indicated by the first field, so as to avoid analyzing the first codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set.

It should be understood that ways one to three are described taking one second codeword as an example, and the case for a plurality of second codewords (second codeword # 1-second codeword # X) is similar to the above. That is, the network device as well as the terminal device can indicate, for the first codeword, configuration information of at least one second set of time-frequency resources (second set of time-frequency resources # 1-second set of time-frequency resources # X) based on the protocol pre-definition, the higher layer signaling indication or the first field.

After determining the first set of time-frequency resources and the at least one second set of time-frequency resources, it may be determined that the first codeword is not mapped on the first set of time-frequency resources and the at least one second set of time-frequency resources in the preset set of time-frequency resources, the second codeword is any one of the at least one second codeword, and the second set of time-frequency resources is a second set of time-frequency resources in the at least one second set of time-frequency resources for mapping a second PTRS corresponding to the second codeword. Further, S220 is executed, in which the network device sends the first codeword and the at least one second codeword to the terminal device.

In the following, taking the example that the terminal device receives the first codeword and the second codeword, how the terminal device parses the first codeword and the second codeword will be described.

Based on the above, S210 is known. When the terminal device receives the first codeword, the first set of time-frequency resources mapped by the first PTRS can be determined based on the first DCI, and then it can be determined that the first codeword is not parsed on the first set of time-frequency resources. Further, the location of the second set of time-frequency resources is predefined by a protocol, received from a network device or determined based on a first field in the first DCI. And avoids parsing the first codeword over the second set of time-frequency resources.

Similarly, when the terminal device receives the second codeword, the terminal device may determine, based on the second DCI, the second set of time-frequency resources mapped by the second PTRS, and then may determine not to parse the second codeword on the second set of time-frequency resources. Further, the location of the first set of time-frequency resources is predefined by a protocol, received from higher layer signaling sent by the network device, or determined based on a second field in the second DCI. And avoids parsing the second codeword over the first set of time-frequency resources.

It should be understood that the specific manner of determining the first time-frequency resource set and the second time-frequency resource set by the terminal device based on the protocol predefined is similar to the determination of the first time-frequency resource set and the second time-frequency resource set by the network device shown in S210, and details are not repeated here.

Therefore, when the terminal device in the embodiment of the application receives the DCI corresponding to the multiple codewords and the multiple codewords, it is not necessary to determine the time-frequency resource set mapped by the codewords after parsing the multiple DCI. The receiving performance of the code word is improved.

The method for data transmission provided by the embodiment of the present application is described in detail above in conjunction with fig. 4 and 5. How the method for data transmission provided by the embodiments of the present application is applied is described below with reference to specific embodiments.

Fig. 6 is a schematic diagram of a first embodiment provided by the present application. The diagram includes TRP #1, TRP #2, and a terminal device supporting CoMP.

Assuming that two TRPs (TRP #1 and TRP #2 shown in fig. 5) respectively schedule two PDSCHs (PDSCH #1 and PDSCH #2 shown in fig. 5) to occupy the same time-frequency resource set, within one RB, the two PDSCHs use different DMRS groups to ensure that DMRS frequency domains are orthogonal.

For TRP #1, PDSCH #1 does not map data on the first set of time-frequency resources occupied by PTRS #1 transmitted by TRP #1, and to avoid interference of PTRS #2 transmitted by TRP #2, TRP #1 further determines a second set of time-frequency resources, which includes the set of time-frequency resources occupied by PTRS #2 transmitted by PTRS # 2. Further, PDSCH #1 does not map data on the second set of time-frequency resources.

For TRP #2, PDSCH #2 does not map data on the second set of time-frequency resources occupied by PTRS #2 transmitted by TRP #2, and to avoid interference of PTRS #1 transmitted by TRP #1, TRP #2 further configures a first set of time-frequency resources including the set of time-frequency resources occupied by PTRS #1 transmitted by TRP # 1. Further, PDSCH #2 does not map data on the first set of time and frequency resources.

S310, TRP #1 determines a second set of time-frequency resources.

Exemplarily, TRP #1 determines the second set of time-frequency resources based on the first way described above. That is, the protocol specifies the time domain starting position, the time domain density, the frequency domain position, and the frequency domain density of the second set of time frequency resources.

S320, the terminal equipment determines a second time frequency resource set.

Illustratively, the terminal device also determines the second set of time-frequency resources based on the first manner described above.

S330, the TRP #1 transmits the first codeword to the terminal device in the PDSCH # 1.

Specifically, PDSCH #1 is scheduled by DCI #1 transmitted by TRP #1, and TRP #1 does not map data on the second set of time-frequency resources and the first set of time-frequency resources in PDSCH # 1. Wherein the location of the first set of time frequency resources is indicated by DCI # 1.

S340, the terminal device demodulates the first code word.

Specifically, when receiving DCI #1, the terminal device learns the position of the first time-frequency resource set, and the position of the second time-frequency resource set is defined based on a protocol. The terminal device determines not to demodulate the first codeword on the first set of time-frequency resources and the second set of time-frequency resources in PDSCH # 1.

S350, TRP #2 determines a first set of time frequency resources.

Exemplarily, TRP #2 determines a first set of time frequency resources. That is, the protocol specifies a time domain starting position, a time domain density, a frequency domain position, and a frequency domain density of the first set of time frequency resources.

S360, the terminal equipment determines a first time-frequency resource set.

Illustratively, the terminal device determines the first set of time-frequency resources based on the first manner described above.

S370, the TRP #2 transmits the second codeword to the terminal device in the PDSCH # 2.

Specifically, PDSCH #2 is scheduled by DCI #2 transmitted by TRP #2, and TRP #2 does not map data on the second set of time-frequency resources and the first set of time-frequency resources in PDSCH # 2. Wherein the location of the second set of time-frequency resources is indicated by DCI # 2.

S380, the terminal device demodulates the second code word.

Specifically, when receiving DCI #2, the terminal device learns the position of the second time-frequency resource set, based on the position of the first time-frequency resource set specified by the protocol. The terminal device determines not to demodulate the second codeword on the second set of time-frequency resources and the first set of time-frequency resources in PDSCH # 2.

It should be understood that fig. 6 is only an example and is not intended to limit the scope of the present application.

It should be understood that, in each method embodiment, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation to the implementation process of the embodiment of the present application.

The method for data transmission provided by the embodiment of the present application is described in detail above with reference to fig. 4 to 6, and the apparatus for data transmission provided by the embodiment of the present application is described in detail below with reference to fig. 7 to 10.

Referring to fig. 7, fig. 7 is a schematic diagram of the apparatus 10 for data transmission proposed in the present application. As shown in fig. 7, the apparatus 10 includes a receiving unit 110 and a processing unit 120.

A processing unit 120 configured to determine a first set of time-frequency resources and at least one second set of time-frequency resources, where the remaining sets of time-frequency resources are used to map the first data and the at least one second data, and the remaining sets of time-frequency resources are preset sets of time-frequency resources except the first set of time-frequency resources and the at least one second set of time-frequency resources,

wherein the first set of time-frequency resources is configured to carry a first Phase Tracking Reference Signal (PTRS), and the at least one second set of time-frequency resources is respectively configured to carry at least one second PTRS, wherein the first PTRS is configured to demodulate the first data, and the at least one second PTRS is respectively configured to demodulate at least one second data;

a receiving unit 110, configured to receive the first data and the at least one second data.

The apparatus 10 and the terminal device in the method embodiment completely correspond to each other, and the apparatus 10 may be the terminal device in the method embodiment, or a chip or a functional module inside the terminal device in the method embodiment. The corresponding elements of the apparatus 10 are adapted to perform the corresponding steps performed by the terminal device in the method embodiments shown in fig. 4-6.

Wherein, the receiving unit 110 in the apparatus 10 executes the steps received by the terminal device in the method embodiment. For example, step 123 of fig. 4 in which the receiving network device sends the first DCI to the terminal device and step 130 of fig. 4 in which the network device sends the first codeword to the terminal device are performed, and step 211 of fig. 5 in which the receiving network device sends the first DCI and the at least one second DCI to the terminal device and step 220 of the receiving network device sends the first codeword and the at least one second codeword to the terminal device are performed. The processing unit 120 performs the steps implemented or processed internally by the terminal device in the method embodiments. For example, step 122 of determining the first set of time-frequency resources in fig. 4 is performed, and step 212 of determining the first set of time-frequency resources and the at least one second set of time-frequency resources in fig. 5 is performed.

Optionally, the apparatus 10 may further include a sending unit 130 for sending information to other devices. The transmitting unit 130 and the receiving unit 110 may constitute a transceiving unit, and have both receiving and transmitting functions. Wherein the processing unit 120 may be a processor. The transmitting unit 130 may be a receiver. The receiving unit 110 may be a transmitter. The receiver and transmitter may be integrated together to form a transceiver.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a terminal device 20 suitable for use in the embodiments of the present application. The terminal device 20 is applicable to the system shown in fig. 1. For convenience of explanation, fig. 8 shows only main components of the terminal device. As shown in fig. 8, the terminal device 20 includes a processor, a memory, a control circuit, an antenna, and an input-output means. The processor is used for controlling the antenna and the input and output device to send and receive signals, the memory is used for storing a computer program, and the processor is used for calling and running the computer program from the memory to execute the corresponding flow and/or operation executed by the terminal equipment in the method for data transmission provided by the application. And will not be described in detail herein.

Those skilled in the art will appreciate that fig. 8 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

Referring to fig. 9, fig. 9 is a schematic diagram of an apparatus 30 for data transmission proposed in the present application. As shown in fig. 9, the apparatus 30 includes a transmitting unit 310 and a processing unit 320.

A processing unit 320, configured to determine a first set of time-frequency resources and at least one second set of time-frequency resources, where the remaining sets of time-frequency resources are used to map first data and at least one second data, and the remaining sets of time-frequency resources are sets of time-frequency resources other than the first set of time-frequency resources and the at least one second set of time-frequency resources in a preset set of time-frequency resources,

the first time-frequency resource set is used for carrying a first Phase Tracking Reference Signal (PTRS), at least one second time-frequency resource set is respectively used for carrying at least one second PTRS, the first PTRS is used for demodulating the first data, and the at least one second PTRS is respectively used for demodulating at least one second data;

a sending unit 310, configured to send the first data and the at least one second data.

The apparatus 30 corresponds to the network device in the method embodiment, and the apparatus 30 may be the network device in the method embodiment, or a chip or a functional module inside the network device in the method embodiment. The corresponding elements of the apparatus 30 are adapted to perform the corresponding steps performed by the network device in the method embodiments shown in fig. 4-6.

The sending unit 310 in the apparatus 30 executes the steps sent by the network device in the method embodiment. For example, step 123 of transmitting the first DCI to the terminal device and step 130 of transmitting the first codeword to the terminal device in fig. 4 are performed, and step 211 of transmitting the first DCI and the at least one second DCI to the terminal device and step 220 of transmitting the first codeword and the at least one second codeword to the terminal device in fig. 5 are performed. Processing unit 320 performs the steps implemented or processed within the network device in the method embodiments. For example, the step 110 of determining the first set of time-frequency resources and the step 120 of determining the second set of time-frequency resources in fig. 4 are performed, and the step 210 of determining the first set of time-frequency resources and the at least one second set of time-frequency resources in fig. 5 is performed.

Optionally, the apparatus 30 may further include a receiving unit 330, configured to receive information sent by other devices. The receiving unit 330 and the transmitting unit 310 may constitute a transceiving unit, and have both receiving and transmitting functions. Wherein the processing unit 320 may be a processor. The transmitting unit 310 may be a receiver. The receiving unit 330 may be a transmitter. The receiver and transmitter may be integrated together to form a transceiver.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a network device 40 suitable for the embodiment of the present application, and may be used to implement the functions of the network device in the method for data transmission described above. Such as a schematic diagram of the structure of the base station. As shown in fig. 10, the network device may be applied to the system shown in fig. 1.

The network device 40 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 401 and one or more baseband units (BBUs). The baseband unit may also be referred to as a Digital Unit (DU) 402. The RRU 401 may be referred to as a transceiver unit, and corresponds to the sending unit 310 in fig. 9. Optionally, the transceiver unit 401 may also be referred to as a transceiver, a transceiver circuit, a transceiver, or the like, and may include at least one antenna 4011 and a radio frequency unit 4012. Alternatively, the transceiver 401 may include a receiving unit and a transmitting unit, where the receiving unit may correspond to a receiver (or receiver or receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter or transmitting circuit). The RRU 401 is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals, for example, for sending the control information described in the above embodiments to a terminal device. The BBU 402 is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 401 and the BBU 402 may be physically disposed together or may be physically disposed separately, that is, distributed base stations.

The BBU 402 is a control center of a network device, and may also be referred to as a processing unit, and may correspond to the processing unit 320 in fig. 9, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulating, spreading, and the like. For example, the BBU (processing unit) 402 can be used to control the network device 40 to execute the operation flow related to the network device in the above-described method embodiment, for example, to determine the length of the symbol carrying the control information of the terminal device.

In an example, the BBU 402 may be formed by one or more boards, and the boards may support a radio access network of a single access system (e.g., an LTE system or a 5G system) together, or may support radio access networks of different access systems respectively. The BBU 402 also includes a memory 4021 and a processor 4022. The memory 4021 is used to store necessary instructions and data. For example, the memory 4021 stores the codebook and the like in the above-described embodiments. The processor 4022 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow related to the network device in the above method embodiment. The memory 4021 and the processor 4022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the network device 40 shown in fig. 10 is capable of implementing the network device functions involved in the method embodiments of fig. 4-6. The operations and/or functions of the units in the network device 40 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, detailed description is appropriately omitted herein. The structure of the network device illustrated in fig. 10 is only one possible form, and should not limit the embodiments of the present application in any way. This application does not exclude the possibility of other forms of network device architecture that may appear in the future.

The embodiment of the present application further provides a system for data transmission, which includes the foregoing network device and one or more terminal devices.

The present application also provides a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform the steps performed by the network device in the above-described methods as shown in fig. 4-6.

The present application also provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps performed by the terminal device in the methods shown in fig. 4-6.

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps performed by the network device in the methods shown in fig. 4-6.

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps performed by the terminal device in the methods as shown in fig. 4-6.

The application also provides a chip comprising a processor. The processor is configured to read and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the terminal device in the method for data transmission provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

The application also provides a chip comprising a processor. The processor is configured to call and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the network device in the method for data transmission provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for data transmission, comprising:

determining a first set of time-frequency resources and at least one second set of time-frequency resources, the remaining sets of time-frequency resources being used for mapping first data and at least one second data, the remaining sets of time-frequency resources being sets of time-frequency resources other than the first set of time-frequency resources and the at least one second set of time-frequency resources in a preset set of time-frequency resources,

wherein the first set of time-frequency resources is configured to carry a first Phase Tracking Reference Signal (PTRS), the at least one second set of time-frequency resources is respectively configured to carry at least one second PTRS, the first PTRS is configured to demodulate the first data, and the at least one second PTRS is respectively configured to demodulate the at least one second data;

transmitting the first data and the at least one second data.

2. The method of claim 1, further comprising:

and transmitting first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

3. The method of claim 2, wherein the determining the first set of time-frequency resources and the second set of time-frequency resources comprises:

determining the first time-frequency resource set according to preconfigured information, wherein the time domain density of the first time-frequency resource set is determined according to a first Modulation and Coding Scheme (MCS), and the first MCS is indicated by the preconfigured information;

alternatively, the first and second electrodes may be,

the preconfiguration information directly indicates a time domain density size of the first set of time frequency resources;

and/or the presence of a gas in the gas,

determining the frequency domain density of the first set of time-frequency resources according to a first number of Resource Blocks (RBs), wherein the first number of RBs is indicated by the preconfigured information; alternatively, the first and second electrodes may be,

the preconfiguration information directly indicates a frequency domain density size of the first set of time frequency resources;

and/or the presence of a gas in the gas,

the preconfiguration information indicating the frequency domain location of the first set of time frequency resources comprises:

the preconfiguration information indicates subcarriers occupied by the first set of time-frequency resources within one RB; alternatively, the first and second electrodes may be,

the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources;

and/or the presence of a gas in the gas,

the preconfiguration information indicates that a time domain starting position of the first set of time and frequency resources is a first time domain starting position, wherein the first time domain starting position is not later than time domain starting positions of the first data and the second data;

Determining a second set of time-frequency resources according to the preconfiguration information, wherein,

the time domain density of the second time frequency resource set is determined according to a second MCS, and the second MCS is indicated by the preconfigured information;

alternatively, the first and second electrodes may be,

the preconfiguration information directly indicates a time domain density size of the second set of time frequency resources;

and/or the presence of a gas in the gas,

determining the frequency domain density of the second time frequency resource set according to a second RB quantity, wherein the second RB quantity is indicated by the preconfigured information; alternatively, the first and second electrodes may be,

the preconfiguration information directly indicates a frequency domain density size of the second set of time-frequency resources;

and/or the presence of a gas in the gas,

the preconfiguration information indicating the frequency domain location of the second set of time-frequency resources comprises:

the preconfiguration information indicates subcarriers occupied by the second time-frequency resource set in one RB; alternatively, the first and second electrodes may be,

the preconfiguration information indicates the DMRS port number associated with the second time frequency resource set, wherein the DMRS port associated with the second time frequency resource set and the DMRS port associated with the first time frequency resource set belong to different Code Division Multiplexing (CDM) groups;

and/or the presence of a gas in the gas,

the preconfiguration information indicates that the time domain starting position of the second time frequency resource set is the first time domain starting position.

4. The method of claim 3, wherein the indicating the frequency-domain location of the second set of time-frequency resources comprises:

determining a first demodulation reference signal (DMRS) port number of the first data according to the first DCI;

if the first DMRS is of the first type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second set of time-frequency resources is 1002, or,

the second time-frequency resource set occupies a preset subcarrier in odd numbered subcarriers in each RB;

if the first DMRS is of the first type and the first DMRS port number comprises at least one of port numbers 1002 and 1003, the DMRS port number associated with the second set of time-frequency resources is 1000, or,

the second time-frequency resource set occupies a preset subcarrier in subcarriers with even numbers in each RB;

if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the second set of time-frequency resources is 1003, or,

the second time frequency resource set occupies a preset subcarrier in subcarriers except subcarriers numbered 0, 1, 6 and 7 in each RB;

If the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the second set of time-frequency resources is 1000, or,

and the second time frequency resource set occupies a preset subcarrier with the number of 0, 1, 6 or 7 in each RB.

5. The method of claim 4, wherein the second set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

the second time frequency resource set occupies subcarriers with the number of 1 in each RB; alternatively, the first and second electrodes may be,

the second time frequency resource set occupies a subcarrier with the number of 0 in each RB; alternatively, the first and second electrodes may be,

the second set of time-frequency resources occupies subcarriers numbered 2 in each RB.

6. The method of claim 3, wherein the indicating the frequency domain location of the first set of time-frequency resources comprises:

determining a DMRS port number corresponding to second data according to the second DCI;

if the second DMRS is of the first type, and the second DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1002, or,

The first time-frequency resource set occupies a preset subcarrier in odd numbered subcarriers in each RB;

if the second DMRS is of the first type, and the second DMRS port number comprises at least one of port numbers 1002 and 1003, the DMRS port number associated with the first set of time-frequency resources is 1000, or,

the first time-frequency resource set occupies a preset subcarrier in subcarriers with even numbers in each RB;

if the second DMRS is of the second type and the second DMRS port number comprises at least one of port numbers 1000 and 1001, the DMRS port number associated with the first set of time-frequency resources is 1004, or,

the first time-frequency resource set occupies a preset subcarrier in subcarriers except subcarriers numbered as 0, 1, 6 and 7 in each RB;

if the second DMRS is of the second type and the second DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the first set of time-frequency resources is 1002, or,

the first time-frequency resource set occupies a subcarrier preset in the numbers of 0, 1, 6 and 7 in each RB.

7. The method of claim 6, wherein the first set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

The first set of time-frequency resources occupies subcarriers numbered 1 in each RB; alternatively, the first and second electrodes may be,

the first set of time-frequency resources occupies subcarriers with the number of 0 in each RB; alternatively, the first and second electrodes may be,

the first set of time-frequency resources occupies subcarriers numbered 2 within each RB.

8. The method according to any of claims 2-7, wherein a first field is included in the first DCI, a second field is included in the second DCI, and the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, where the location relationship includes at least one of:

the time domain resources and/or the frequency domain resources occupied by the first data and the second data are completely overlapped;

the time domain resources and/or frequency domain resources occupied by the first data and the second data are partially overlapped;

the time domain resources and/or the frequency domain resources occupied by the first data and the second data respectively are not overlapped.

9. The method of claim 8, wherein the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources;

if the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively are completely overlapped, the frequency domain density of the second time frequency resource set is equal to the frequency domain density of the first time frequency resource set, wherein the frequency domain density of the first time frequency resource set is based on the frequency domain resource indication information in the first DCI;

If the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the second time frequency resource set is equal to X, the X is determined according to the first field or determined according to the high-level configuration parameters, and the value of the X is 2 or 4; and/or the presence of a gas in the gas,

the position relation is used for determining the frequency domain density of the first time-frequency resource set;

if the time domain resources and/or frequency domain resources occupied by the first data and the second data are completely overlapped, the frequency domain density of the first time frequency resource set is equal to the frequency domain density of the second time frequency resource set, wherein the frequency domain density of the second time frequency resource set is determined based on the frequency domain resource indication information in the second DCI;

and if the time domain resources and/or the frequency domain resources occupied by the first data and the second data are partially overlapped, the frequency domain density of the first time-frequency resource set is equal to Y, the Y is determined according to the second field or the high-level configuration parameters, and the value of the Y is 2 or 4.

10. The method according to any one of claims 1-9, further comprising:

and sending a high-layer signaling, wherein the high-layer signaling is used for indicating the first time-frequency resource set and at least one second time-frequency resource set.

11. A method for data transmission, comprising:

determining a first set of time frequency resources and at least one second set of time frequency resources, the remaining sets of time frequency resources being used for mapping the first data and the at least one second data, the remaining sets of time frequency resources being preset sets of time frequency resources except the first set of time frequency resources and the at least one second set of time frequency resources,

receiving the first data and the at least one second data.

12. The method of claim 11, further comprising:

receiving first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

13. The method of claim 12, wherein determining the first set of time-frequency resources and the second set of time-frequency resources corresponding to the second codeword comprises:

or, the preconfiguration information directly indicates the time domain density size of the first set of time frequency resources;

determining the frequency domain density of the first set of time-frequency resources according to a first number of Resource Blocks (RBs), wherein the first number of RBs is indicated by the preconfigured information;

or, the preconfiguration information directly indicates a frequency domain density size of the first set of time-frequency resources;

the preconfiguration information indicates subcarriers occupied by the first set of time-frequency resources within one RB;

or, the preconfiguration information indicates a demodulation reference signal (DMRS) port number associated with the first set of time-frequency resources;

Determining a second time frequency resource set according to the preconfigured information, wherein the time domain density of the second time frequency resource set is determined according to a second MCS, and the second MCS is indicated by the preconfigured information;

or, the preconfiguration information directly indicates the time domain density size of the second time frequency resource set;

determining the frequency domain density of the second time frequency resource set according to a second RB quantity, wherein the second RB quantity is indicated by the preconfigured information;

or, the preconfiguration information directly indicates a frequency domain density size of the second set of time-frequency resources;

the preconfiguration information indicating the frequency domain location of the second set of time-frequency resources comprises: the preconfiguration information indicates subcarriers occupied by the second time-frequency resource set in one RB;

or the preconfiguration information indicates a DMRS port number associated with the second set of time frequency resources, wherein the DMRS port associated with the second set of time frequency resources and the DMRS port associated with the first set of time frequency resources belong to different CDM groups;

14. The method of claim 13, wherein the indicating the frequency-domain location of the second set of time-frequency resources comprises:

15. The method of claim 14, wherein the second set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

16. The method of claim 13, wherein the indicating the frequency domain location of the first set of time-frequency resources comprises:

17. The method of claim 16, wherein the first set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

18. The method according to any of claims 12-17, wherein a first field is included in the first DCI, a second field is included in the second DCI, and the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, where the location relationship includes at least one of:

19. The method of claim 18, wherein the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources;

20. The method according to any one of claims 11-19, further comprising:

receiving a high layer signaling, wherein the high layer signaling is used for indicating the first set of time-frequency resources and at least one second set of time-frequency resources.

21. An apparatus for data transmission, comprising:

a processing unit, configured to determine a first set of time-frequency resources and at least one second set of time-frequency resources, where remaining sets of time-frequency resources are used to map first data and at least one second data, and the remaining sets of time-frequency resources are sets of time-frequency resources other than the first set of time-frequency resources and the at least one second set of time-frequency resources in a preset set of time-frequency resources,

wherein the first set of time-frequency resources is used for carrying a first Phase Tracking Reference Signal (PTRS), the at least one second set of time-frequency resources is respectively used for carrying at least one second PTRS, the first PTRS is used for demodulating the first data, and the at least one second PTRS is used for demodulating the at least one second data;

a sending unit, configured to send the first data and the at least one second data.

22. The apparatus of claim 21, wherein the transmitting unit is further configured to transmit a first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

23. The apparatus of claim 22, wherein the processing unit determines the first set of time-frequency resources and the second set of time-frequency resources comprises:

the processing unit determines the first time-frequency resource set according to preconfigured information, wherein the time domain density of the first time-frequency resource set is determined according to a first Modulation and Coding Scheme (MCS), and the first MCS is indicated by the preconfigured information;

alternatively, the first and second electrodes may be,

and/or the presence of a gas in the gas,

And/or the presence of a gas in the gas,

the processing unit determines a second set of time-frequency resources according to the preconfiguration information, wherein,

alternatively, the first and second electrodes may be,

and/or the presence of a gas in the gas,

And/or the presence of a gas in the gas,

24. The apparatus of claim 23, wherein the indicating the frequency-domain location of the second set of time-frequency resources comprises:

the processing unit determines a first demodulation reference signal (DMRS) port number of the first data according to the first DCI;

The second time frequency resource set occupies a preset subcarrier in subcarriers except subcarriers numbered 0, 1, 6 and 7 in each RB; if the first DMRS is of the second type and the first DMRS port number comprises at least one of port numbers 1002, 1003, 1004, and 1005, the DMRS port number associated with the second set of time-frequency resources is 1000, or,

25. The apparatus of claim 24, wherein the second set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

26. The apparatus of claim 23, wherein the indicating the frequency domain location of the first set of time-frequency resources comprises:

the processing unit determines a DMRS port number corresponding to second data according to the second DCI;

27. The apparatus of claim 26, wherein the first set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

the number of subcarriers occupied by the first time-frequency resource set in each RB is 1; alternatively, the first and second electrodes may be,

the first time-frequency resource set occupies subcarriers with the number of 0 in each RB; alternatively, the first and second electrodes may be,

28. The apparatus according to any of claims 22-27, wherein a first field is included in the first DCI, a second field is included in the second DCI, and the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, where the location relationship includes at least one of:

29. The apparatus of claim 28, wherein the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources;

30. The apparatus of any one of claims 21-29, further comprising:

31. An apparatus for data transmission, comprising:

a processing unit configured to determine a first set of time-frequency resources and at least one second set of time-frequency resources, wherein the remaining sets of time-frequency resources are used for mapping first data and the at least one second data, and the remaining sets of time-frequency resources are preset sets of time-frequency resources except the first set of time-frequency resources and the at least one second set of time-frequency resources,

wherein the first set of time-frequency resources is configured to carry a first Phase Tracking Reference Signal (PTRS), and the at least one second set of time-frequency resources is respectively configured to carry at least one second PTRS, wherein the first PTRS is configured to demodulate the first data, and the at least one second PTRS is respectively configured to demodulate the at least one second data;

A receiving unit configured to receive the first data and the at least one second data.

32. The apparatus of claim 31, wherein the receiving unit is further configured to receive a first Downlink Control Information (DCI) and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the at least one second data, and the first DCI is used for scheduling the first data.

33. The apparatus of claim 32, wherein the processing unit determines a first set of time-frequency resources and a second set of time-frequency resources corresponding to the second codeword comprises:

the processing unit determines a second time frequency resource set according to the preconfigured information, wherein the time domain density of the second time frequency resource set is determined according to a second MCS, and the second MCS is indicated by the preconfigured information;

34. The apparatus of claim 33, wherein the indicating the frequency-domain location of the second set of time-frequency resources comprises:

35. The apparatus of claim 34, wherein the second set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

36. The apparatus of claim 33, wherein the indicating the frequency domain location of the first set of time-frequency resources comprises:

37. The apparatus of claim 36, wherein the first set of time-frequency resources occupies a subcarrier number 0 in each RB; alternatively, the first and second electrodes may be,

38. The apparatus of any one of claims 32-37, wherein a first field is included in the first DCI, wherein a second field is included in the second DCI, and wherein the first field or the second field is used to indicate a location relationship of time-frequency resource sets occupied by the first data and the second data, respectively, and wherein the location relationship comprises at least one of:

39. The apparatus of claim 38, wherein the positional relationship is used to determine a frequency-domain density of the second set of time-frequency resources;

40. The apparatus of any one of claims 31-39, further comprising:

41. A communication device, comprising:

a memory for storing a computer program;

a transceiver for performing a transceiving step;

a processor for invoking and running the computer program from the memory, causing the communication device to perform the method of any of claims 1-20.

42. A computer-readable storage medium, comprising: the computer readable medium stores a computer program; the computer program, when run on a computer, causes the computer to perform the method of any one of claims 1-20.

43. A communication system, comprising:

the apparatus for data transmission of any one of claims 21-30 and the apparatus for data transmission of any one of claims 31-40.