WO2020211767A1

WO2020211767A1 - Method and apparatus for data transmission

Info

Publication number: WO2020211767A1
Application number: PCT/CN2020/084868
Authority: WO
Inventors: 刘显达; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2019-04-16
Filing date: 2020-04-15
Publication date: 2020-10-22
Also published as: CN111836368A

Abstract

The present application provides a method and apparatus for data transmission. The method comprises: determining a first time frequency resource set and at least one second time frequency resource set, a remaining time frequency resource set being used for mapping first data and at least one second data and being a time frequency resource set in a preset time frequency resource set other than the first time frequency resource set and the at least one second time frequency resource set; the first time frequency resource set being used for bearing a first PTRS; the second time frequency resource set being used for bearing a second PTRS; the first PTRS being used for demodulating the first data; the second PTRS being used for demodulating the second data; and sending the first data and the at least one second data. According to the technical solution provided by the present application, by pre-determining, on a time frequency resource set which bears data, a time frequency resource set which cannot map the data, a terminal device is protected from determining, on the basis of multiple pieces of DCI, the time frequency resource set which cannot map the data, thereby improving the data receiving performance.

Description

Method and device for data transmission

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910305552.6, and the application name is "Method and Apparatus for Data Transmission" on April 16, 2019, the entire content of which is incorporated into this application by reference in.

Technical field

This application relates to the field of communications, and more specifically, to a method and device for data transmission.

Background technique

In the 3rd generation partnership project (3GPP) long term evolution advanced (LTE-A), coordinated multi-point (CoMP) technology utilizes multiple geographically separated networks The cooperation between devices communicates with user equipment (UE), thereby reducing cell edge UE interference, improving cell edge throughput, and improving reliability.

When multiple network devices (for example, denoted as network device #A and network device #B) send data to a terminal device, in order to ensure the demodulation performance of the data, multiple network devices can respectively send phase tracking reference signals to the terminal device (Phase tracking reference signal, PTRS) is used to demodulate channels sent by multiple network devices.

In the current technology, the terminal device determines the demodulation of the physical downlink shared channel sent by different network devices based on the downlink control information (DCI) sent by multiple network devices (for example, network device #A and network device #B) respectively The location of the time-frequency resource collection of the data carried by the (physical downlink shared channel, PDSCH). However, when the terminal device receives multiple DCIs, the terminal device needs to combine multiple DCIs after receiving multiple DCIs in order to accurately know the location of the time-frequency resource set of the data mapping carried by the PDSCHs scheduled by the multiple DCIs. The carried time-frequency resource set indication information comprehensively judges the position of the time-frequency resource set of data mapping carried by each PDSCH. For example, the PDSCH 1 scheduled by DCI 1 needs to be judged according to the non-zero power (NZP) PTRS scheduled by DCI 2 The PDSCH 1 cannot be mapped on the corresponding time-frequency resources, which will reduce the data reception performance. Therefore, how to improve the data receiving performance becomes an urgent problem to be solved.

Summary of the invention

The present application provides a method and device for data transmission. By predetermining the time-frequency resource set that cannot map the data on the time-frequency resource set carrying data, it prevents the terminal device from determining the time-frequency that cannot map the data based on multiple DCIs Collection of resources to improve data reception performance.

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, and the remaining time-frequency resource set is used to map the first data and the at least one first data Second data, the remaining time-frequency resource set is a preset time-frequency resource set divided by the first time-frequency resource set and the at least one second time-frequency resource set, wherein the first time-frequency resource set It is used to carry the first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS respectively, wherein the first PTRS is used to demodulate the first data, and the At least one second PTRS is respectively used to demodulate the at least one second data; to send 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 for scheduling the second data. The indication information will select one of the time-frequency resources of a plurality of candidate second PTRSs, and the second time-frequency resource includes the DCI The indicated time-frequency resources of multiple candidate second PTRSs.

According to the method for data transmission provided by the embodiment of the present application, the network device determines the time-frequency resource set of the PTRS respectively used for mapping multiple data, and determines not to map data on the time-frequency resource set of the mapped PTRS.

It should be understood that the aforementioned first data and at least one second data are not mapped on the first time-frequency resource set and at least one second time-frequency resource set; in other words, the first data is based on the first time-frequency resource set and at least one second time-frequency resource set. The set of time-frequency resources performs rate matching; in other words, the first time-frequency resource and at least one second time-frequency resource are rate-matching resources of the first data, and the base station sends the first data according to the first time-frequency resource and at least one second time-frequency resource. The location of the frequency resource performs rate matching, and the terminal device receives the first data according to the location of the first time-frequency resource and at least one second time-frequency resource.

It should also be understood that the above-mentioned remaining time-frequency resource set used for mapping the first data and at least one second data can be understood as part of the remaining time-frequency resource set used for mapping the first data and at least one second data Or, it can be understood that all time-frequency resource sets in the remaining time-frequency resource sets are used to map the first data and at least one second data.

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

The first data and the at least one second data use different transmission ports; in other words, the first data and the at least one second data correspond to different DMRS ports; in other words, the first data and the at least one second data are different codewords ; In other words, the first data and the at least one second data are different transmission blocks (transmission block, TB); in other words, the first data and the at least one second data correspond to different transmission layers; or, the first data and the at least one second data correspond to different transmission layers; The spatial filtering information of at least one second data is different; in other words, the first data and at least one second data occupy the same carrier; in other words, the first data and at least one second data occupy the same bandwidth part (bandwidth part, BWP).

With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending first downlink control information DCI and at least one second DCI, wherein the at least one second DCI is used for scheduling respectively The at least one second data, and the first DCI is used to schedule the first data.

According to the method for data transmission provided in the embodiments of the present application, in order to schedule multiple data, a network device needs to send multiple DCIs to a terminal device that receives the multiple data.

Optionally, the first DCI is not used to schedule the second data, and the second DCI is not used to schedule the first data;

Optionally, the first DCI is only used to schedule the first data, and the first DCI is only used to schedule the second data.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the physical downlinks corresponding to the first DCI and the second DCI The control channel configuration parameters are different; in other words, the demodulation reference signal DMRS ports indicated by the first DCI and the second DCI belong to different code division multiplexing CDM groups; in other words, the control resource set occupied by the first DCI and the second DCI occupy In other words, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP; in other words, the scrambling code of the first DCI and the second DCI The scrambling codes of the scrambling are different; in other words, the HARQ process group of the hybrid automatic repeat request process (HARQ process) indicated by the first DCI and the HARQ process group of the HARQ process indicated by the second DCI are different ; In other words, the transmission beam indicated by the first DCI and the transmission beam indicated by the second DCI are different; or, the transmission beam group indicated by the first DCI and the transmission beam group indicated by the second DCI are different; or, the transmission beam group indicated by the first DCI The transmission beam or quasi co-location indicator (QCL) corresponding to the control resource set or the control resource set group is different from the transmission beam or quasi co-location indicator (QCL) corresponding to the control resource set or the 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 time-frequency resource set and the second time-frequency resource set corresponding to the second codeword includes: determining the first time-frequency resource set according to pre-configuration information A set of time-frequency resources, wherein the time-domain density of the first set of time-frequency resources is determined according to a first modulation and coding scheme MCS, wherein the first MCS is indicated by the pre-configuration information; or, the pre-configuration The configuration information directly indicates the size of the time domain density of the first time-frequency resource set; the frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is the The pre-configuration information indicates; or, the pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set; the pre-configuration information indicates that the frequency domain position of the first time-frequency resource set includes: The pre-configuration information indicates the sub-carriers occupied by the first time-frequency resource set in one RB; or, the pre-configuration information indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set; The pre-configuration information indicates that the time domain start position of the first time-frequency resource set is the first time domain start position, wherein the first time domain start position is no later than the first data and the first time domain start position. 2. The time domain starting position of the data; the second time-frequency resource set is determined according to the pre-configuration information, wherein the time-domain density of the second time-frequency resource set is determined according to the second MCS, wherein the second MCS Is indicated by the pre-configuration information; or, the pre-configuration information directly indicates the time-domain density of the second time-frequency resource set; the frequency-domain density of the second time-frequency resource set is determined according to the number of second RBs , Wherein the second number of RBs is indicated by the pre-configuration information; or, the pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set; the pre-configuration information indicates the first The frequency domain position of the second time-frequency resource set includes: the pre-configuration information indicates the subcarriers occupied by the second time-frequency resource set in one RB; or, the pre-configuration information indicates the second time-frequency resource set The associated DMRS port number, where 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 pre-configuration information indicates the second time-frequency resource set The time domain start position of the resource set is the first time domain start position.

Optionally, the MCS corresponding to the first time-frequency resource set is determined according to the MCS indicated by the DCI that schedules the first data. The MCS indicated by the DCI is used to determine the modulation and coding scheme of the first data, and at the same time, the MCS is used to determine The time domain density of the first PTRS of the first data. Further, the MCS can also be used to determine the second time-frequency resource set at the same time, or in other words, to determine the time-domain density of the second PTRS of the second data to deduce the second time-frequency resource set; or, according to the MCS The second time-frequency resource set is determined by the offset value of one MCS number, or in other words, the time-domain density of the second PTRS used to determine the second data and then the second time-frequency resource set is deduced. The offset value can be configured through higher layer signaling.

It should be understood that the determination of the time-domain density of the first time-frequency resource set based on the first MCS referred to in this application refers to determining the time-domain density of the time-frequency resource set according to the first transmission capability value reported by the first MCS and the terminal device . Wherein, the first transmission capability value reported by the terminal device is used to determine the time domain density of the PTRS corresponding to the first data; in the same way, the aforementioned determination of the time domain density of the second time-frequency resource set based on the second MCS refers to The second MCS and the third transmission capability value reported by the terminal device determine the time domain density of the time-frequency resource set. The third transmission capability value reported by the terminal device is used to determine 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 time-frequency resource set involved in this application is determined according to the number of the first resource block RB, which refers to determining the time-frequency resource set according to the second transmission capability value reported by the first RB and the terminal device The frequency domain density. Wherein, the second transmission capability value reported by the terminal device is used to determine the frequency domain density of the PTRS corresponding to the first data; similarly, the above-mentioned determining the frequency domain density of the second time-frequency resource set based on the second RB refers to The second RB and the fourth transmission capability value reported by the terminal device determine the frequency domain density of the time-frequency resource set. The fourth transmission capability value reported by the terminal device is used to determine the frequency domain density of the PTRS corresponding to the second data.

It should also be understood that the frequency domain position of the first time-frequency resource set is indicated by indicating the demodulation reference signal DMRS port number associated with the first time-frequency resource set in this application because it can be based on the DMRS associated with the first time-frequency resource set. The port number determines the subcarriers occupied by the first time-frequency resource set in one RB; similarly, the frequency domain position of the second time-frequency resource set is indicated by indicating the demodulation reference signal DMRS port number associated with the second time-frequency resource set, This is 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 understood that the determination of the first time-frequency resource set involved in this application further includes: determining the RBs occupied by the first time-frequency resource set, specifically, in terms of the first data, the RBs occupied by the first time-frequency resource set The RBs occupied by the first data scheduled for the first DCI described above, for the second data, the RBs occupied by the first time-frequency resource set are occupied by the second data scheduled for the second DCI described above RB; for the same reason, the determination of the second time-frequency resource set involved in this application also includes: determining the RB occupied by the second time-frequency resource set, specifically, in the first data, the second time-frequency resource set occupied The RB is the RB occupied by the first data scheduled by the first DCI described above. For the second data, the RB occupied by the second time-frequency resource set is the second data occupied by the second DCI schedule described above. RB.

According to the method for data transmission provided by the embodiment of the present 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 some implementations of the first aspect, the method further includes: sending high-layer signaling, wherein the high-layer signaling is used to indicate the first time-frequency resource set and at least one second Time-frequency resource collection.

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

With reference to the first aspect, in some implementations of the first aspect, the indicating the frequency domain position of the second time-frequency resource set includes: determining the first demodulation of the first data according to the first DCI Reference signal DMRS port number; 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 DMRS port number associated with the second time-frequency resource set is 1002 , Or, the second time-frequency resource set occupies a preset sub-carrier among the odd-numbered sub-carriers in each RB; if the first DMRS is of the first type, and the first DMRS port number At least one of the port numbers 1002 and 1003 is included, and the DMRS port number associated with the second time-frequency resource set is 1000, or the second time-frequency resource set occupies an even-numbered subcarrier in each RB A preset subcarrier; 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, the DMRS port number associated with the second time-frequency resource set Is 1003, or the second time-frequency resource set occupies a preset one of the sub-carriers except the sub-carriers numbered 0, 1, 6, and 7 in each RB; if the first DMRS is the first DMRS Two types, 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 1000, or the second time-frequency resource set The resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB.

According to the method for data transmission provided by the embodiment of the present 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, thereby Only by determining the first DMRS port number, the frequency domain position of the second time-frequency resource set can be determined.

With reference to the first aspect, in some implementations of the first aspect, the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or, the second time-frequency resource set is located in each RB The subcarrier numbered internally is 1; or the second time-frequency resource set occupies the subcarrier numbered 0 in each RB; or the second time-frequency resource set occupies the subcarrier numbered in each RB 2 subcarriers.

Specifically, the second time-frequency resource set occupies a preset subcarrier in each RB with an odd number of subcarriers, including: the second time-frequency resource set occupies a subcarrier with a number 1 in each RB Sub-carrier; or, the second time-frequency resource set occupies an even number of sub-carriers in each RB and a preset sub-carrier includes: the second time-frequency resource set occupies a sub-carrier number in each RB 0; the second time-frequency resource set occupies a preset sub-carrier except for numbers 0, 1, 6, and 7 in each RB, including: the second time-frequency resource set is located at every RB A subcarrier numbered 2 in each RB; the second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB, including: the second time-frequency resource The set occupies the subcarrier numbered 0 in each RB.

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

With reference to the first aspect, in some implementations of the first aspect, the indicating the frequency domain position of the first time-frequency resource set includes: determining a second demodulation reference corresponding to the second data according to the second DCI Signal DMRS port number; 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 time-frequency resource set is 1002 , Or, the first time-frequency resource set occupies a preset sub-carrier among the odd-numbered sub-carriers in each RB; if the second DMRS is of the first type, and the second DMRS port number includes port At least one of the numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, or the first time-frequency resource set is preset in each RB that occupies an even-numbered subcarrier 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 DMRS port number associated with the first time-frequency resource set is 1004 , Or, the first set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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, and the DMRS port number associated with the first time-frequency resource set is 1002, or the first time-frequency resource set In each RB, a preset subcarrier numbered 0, 1, 6, and 7 is occupied.

Specifically, the first set of time-frequency resources in each RB occupies an odd-numbered subcarrier preset for a subcarrier includes: the first set of time-frequency resources in each RB occupies the number of 1 subcarrier Sub-carrier; or, the first set of time-frequency resources in each RB occupies an even number of sub-carriers in the sub-carrier preset includes: the first set of time-frequency resources in each RB occupation number is 0; the first set of time-frequency resources occupies one of the preset subcarriers except for numbers 0, 1, 6, and 7 in each RB, including: the first set of time-frequency resources is located in each RB A subcarrier numbered 2 in each RB; the first time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB including: the first time-frequency resource The set occupies the subcarrier numbered 0 in each RB.

According to the method for data transmission provided by the embodiment of the present 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, thereby Only by determining the second DMRS port number, the frequency domain position of the first time-frequency resource set can be determined.

With reference to the first aspect, in some implementations 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 The positional relationship of the set of time-frequency resources occupied by the first data and the second data, where the positional relationship includes at least one of the following: the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap ; The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap; the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.

According to the method for data transmission provided in the embodiments of the present application, a network device can add a field in the DCI that indicates the location relationship of time domain resources and/or frequency domain resources occupied by different data.

With reference to the first aspect, in some implementations of the first aspect, the location relationship used to determine the frequency domain density of the second time-frequency resource set includes: if the first data and the second data occupy the Time domain resources and/or frequency domain resources completely overlap, 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 of the first time-frequency resource set The domain density 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 data and the second data partially overlap, the second time-frequency resource set The frequency domain density is equal to X, the X is determined according to the first field or is determined according to high-level configuration parameters, and the value of X is 2 or 4; and/or, the position relationship is used to determine the first time-frequency resource set The frequency domain density includes: if the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, the frequency domain density of the first time-frequency resource set is equal to the second time-frequency resource set The frequency domain density of the resource set, where 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 first data and the second data occupy the time The frequency domain resources and/or frequency domain resources partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is determined according to the second field or according to high-level configuration parameters, and the value of Y is 2 or 4. .

According to the method for data transmission provided by the embodiment of the present application, the position relationship of the time domain resources and/or frequency domain resources occupied by the first data and the second data can be used to indicate the frequency domain of the second time-frequency resource set. The relationship between the density 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, and the remaining time-frequency resource set is used to map the first data and the at least one first data Second data, the remaining time-frequency resource set is a preset time-frequency resource set divided by 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 to carry the first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS respectively, where the first PTRS is used to demodulate the first data, and the At least one second PTRS is respectively used to demodulate at least one second data; to receive 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 for scheduling the second data. The indication information will select one of the time-frequency resources of a plurality of candidate second PTRSs, and the second time-frequency resource includes the DCI The indicated time-frequency resources of multiple candidate second PTRSs.

According to the method for data transmission provided by the embodiment of the present application, the terminal device determines the time-frequency resource set mapped to the PTRS corresponding to the multiple data, and determines not to demodulate the data on the time-frequency resource set mapped to the PTRS.

It should be understood that the aforementioned first data and at least one second data are not mapped on the first time-frequency resource set and at least one second time-frequency resource set; in other words, the first data is based on the first time-frequency resource set and the second time-frequency resource set. The resource set performs rate matching; in other words, the first time-frequency resource and at least one second time-frequency resource are rate-matching resources for the first data, and the base station sends the first data according to the first time-frequency resource and at least one second time-frequency resource Rate matching is performed at the location of, and the terminal device receives the first data according to the location of the first time-frequency resource and at least one second time-frequency resource.

Optionally, the preset time-frequency resource set is determined according to the time-frequency resource location indicated by the DCI that schedules the data; or, the remaining time-frequency resource set is determined directly according to the DCI that schedules the data.

The first data and the second data use different transmission ports; in other words, the first data and the second data correspond to different DMRS ports; in other words, the first data and the second data are different codewords; in other words, the first data and the second data are different codewords; The data and the second data correspond to different TBs; in other words, the first data and the second data correspond to different transmission layers; in other words, the spatial filtering information of the first data and the second data are different; in other words, the first data and the second data The second data occupies the same carrier; in other words, the first data and the second data occupies the same BWP.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: receiving the first downlink control information DCI and at least one second DCI, wherein the at least one second DCI is used for scheduling respectively The at least one second data, and the first DCI is used to schedule the first data.

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

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the physical downlinks corresponding to the first DCI and the second DCI The control channel configuration parameters are different; in other words, the demodulation reference signal DMRS ports indicated by the first DCI and the second DCI belong to different code division multiplexing CDM groups; in other words, the control resource set occupied by the first DCI and the second DCI occupy In other words, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP; in other words, the scrambling code of the first DCI and the second DCI The scrambling codes are different; in other words, the HARQ process group in which the HARQ process code indicated by the first DCI is in is different from the HARQ process group in which the HARQ process code indicated by the second DCI is in different; The sending beams indicated by the second DCI are different; in other words, the sending beam group indicated by the first DCI and the sending 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 time-frequency resource set and the second time-frequency resource set corresponding to the second codeword includes: determining the first time-frequency resource set according to pre-configuration information A set of time-frequency resources, wherein the time-domain density of the first set of time-frequency resources is determined according to a first modulation and coding scheme MCS, wherein the first MCS is indicated by the pre-configuration information; or, the pre-configuration The configuration information directly indicates the size of the time domain density of the first time-frequency resource set; the frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is the The pre-configuration information indicates; or, the pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set; the pre-configuration information indicates that the frequency domain position of the first time-frequency resource set includes: The pre-configuration information indicates the sub-carriers occupied by the first time-frequency resource set in one RB; or, the pre-configuration information indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set; The pre-configuration information indicates that the time domain start position of the first time-frequency resource set is the first time domain start position, wherein the first time domain start position is no later than the first data and the first time domain start position. 2. The time domain starting position of the data; the second time-frequency resource set is determined according to the pre-configuration information, wherein the time-domain density of the second time-frequency resource set is determined according to the second MCS, wherein the second MCS Is indicated by the pre-configuration information; or, the pre-configuration information directly indicates the time-domain density of the second time-frequency resource set; the frequency-domain density of the second time-frequency resource set is determined according to the number of second RBs , Wherein the second number of RBs is indicated by the pre-configuration information; or, the pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set; the pre-configuration information indicates the first The frequency domain position of the second time-frequency resource set includes: the pre-configuration information indicates the subcarriers occupied by the second time-frequency resource set in one RB; or, the pre-configuration information indicates the second time-frequency resource set The associated DMRS port number, where 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 pre-configuration information indicates the second time-frequency resource set The time domain start position of the resource set is the first time domain start position.

It should be understood that the determination of the time-domain density of the first time-frequency resource set based on the first MCS referred to in this application refers to the determination of the time-domain density of the time-frequency resource set according to the first MCS and the known first transmission capability value of the terminal device . Wherein, the first transmission capability value known by the terminal device is used to determine the time domain density of the PTRS corresponding to the first data; in the same way, the aforementioned determination of the time domain density of the second time-frequency resource set based on the second MCS refers to The second MCS and the terminal device know the third transmission capability value to determine the time domain density of the time-frequency resource set. The third transmission capability value known by the terminal device is used to determine 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 time-frequency resource set involved in this application is determined according to the number of the first resource block RB, which refers to determining the time-frequency resource set according to the first RB and the known second transmission capability value of the terminal device The frequency domain density. The second transmission capability value known by the terminal device is used to determine the frequency domain density of the PTRS corresponding to the first data; similarly, the above-mentioned determining the frequency domain density of the second time-frequency resource set based on the second RB refers to The second RB and the terminal device know the fourth transmission capability value to determine the frequency domain density of the time-frequency resource set. Wherein, the terminal device knows the fourth transmission capability value to determine the frequency domain density of the PTRS corresponding to the second data.

According to the method for data transmission provided in the embodiment of the present 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 some implementations of the second aspect, the method further includes: receiving high-layer signaling, wherein the high-layer signaling is used to indicate the first time-frequency resource set and at least one second Time-frequency resource collection.

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

With reference to the second aspect, in some implementation manners of the second aspect, the indicating the frequency domain position of the second time-frequency resource set includes: determining the first demodulation of the first data according to the first DCI Reference signal DMRS port number; 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 DMRS port number associated with the second time-frequency resource set is 1002 , Or, the second time-frequency resource set occupies a preset sub-carrier among the odd-numbered sub-carriers in each RB; if the first DMRS is of the first type, and the first DMRS port number At least one of the port numbers 1002 and 1003 is included, and the DMRS port number associated with the second time-frequency resource set is 1000, or the second time-frequency resource set occupies an even-numbered subcarrier in each RB A preset subcarrier; 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, the DMRS port number associated with the second time-frequency resource set Is 1003, or the second time-frequency resource set occupies a preset one of the sub-carriers except the sub-carriers numbered 0, 1, 6, and 7 in each RB; if the first DMRS is the first DMRS Two types, 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 1000, or the second time-frequency resource set The resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB. Among them, the sub-carrier number is sequentially numbered from the sub-carrier with the highest frequency to the sub-carrier with the lowest frequency within 1 RB, or the sub-carrier number is from the sub-carrier with the lowest frequency to the sub-carrier with the highest frequency within 1 RB Number in sequence.

With reference to the second aspect, in some implementations of the second aspect, the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or, the second time-frequency resource set is located in each RB The subcarrier numbered 1 is internally occupied; or, the second time-frequency resource set occupies the subcarrier numbered 02 in each RB. Specifically, the second time-frequency resource set occupies a preset subcarrier in each RB with an odd number of subcarriers, including: the second time-frequency resource set occupies a subcarrier with a number 1 in each RB Sub-carrier; or, the second time-frequency resource set occupies an even number of sub-carriers in each RB and a preset sub-carrier includes: the second time-frequency resource set occupies a sub-carrier number in each RB 0; the second time-frequency resource set occupies a preset sub-carrier except for numbers 0, 1, 6, and 7 in each RB, including: the second time-frequency resource set is located at every RB A subcarrier numbered 2 in each RB; the second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB, including: the second time-frequency resource The set occupies the subcarrier numbered 0 in each RB.

According to the method for data transmission provided by 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 the multiple subcarriers in one RB, the number of the multiple subcarriers is generally selected The smallest subcarrier is used as the subcarrier occupied by the first time-frequency resource set, and the subcarrier with the 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 position of the first time-frequency resource set includes: determining a second demodulation reference corresponding to the second data according to the second DCI Signal DMRS port number; 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 time-frequency resource set is 1002 , Or, the first time-frequency resource set occupies a preset sub-carrier among the odd-numbered sub-carriers in each RB; if the second DMRS is of the first type, and the second DMRS port number includes port At least one of the numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, or the first time-frequency resource set is preset in each RB that occupies an even-numbered subcarrier 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 DMRS port number associated with the first time-frequency resource set is 1004 , Or, the first set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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, and the DMRS port number associated with the first time-frequency resource set is 1002, or the first time-frequency resource set In each RB, a preset subcarrier numbered 0, 1, 6, and 7 is occupied.

With reference to the second aspect, in some implementations of the second aspect, the first DCI includes a first field, the second DCI includes a second field, and the first field and/or the second field are used In order to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data, the position relationship includes at least one of the following: time domain resources and/or frequency domain resources respectively occupied by the first data and the second data Completely overlap; the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap; the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.

According to the method for data transmission provided by the embodiment of the present application, the DCI received by the terminal device includes a field indicating the positional relationship of the 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. The time unit is a slot, or orthogonal frequency division multiplexing (OFDM) symbols, or code division multiple access (code division multiple access). division multiple access, CDMA) symbol.

Optionally, the OFDM symbols occupied by the first data and the second data overlap.

With reference to the second aspect, in some implementations of the second aspect, the location relationship used to determine the frequency domain density of the second time-frequency resource set includes: if the first data and the second data occupy the Time domain resources and/or frequency domain resources completely overlap, 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 of the first time-frequency resource set The domain density is determined 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 data and the second data partially overlap, the first time-frequency resource set The frequency domain density of is equal to X, and the X is determined according to the first field (the two state values in the first field correspond to the partial overlap of the time-frequency resources occupied by the first data and the second data, and respectively correspond to X = 2 and X = 4) or determined according to high-level configuration parameters, and the value of X is 2 or 4; and/or the location relationship used to determine the frequency domain density of the first time-frequency resource set includes: if the The time domain resources and/or frequency domain resources occupied by the first data and the second data respectively completely overlap, and 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 resource portions occupied by the first data and the second data respectively Overlap, 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 is determined according to high-level configuration parameters, and the value of 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 and coding mode MCS, The frequency domain density of the second time-frequency resource set is determined according to the preset number of resource block RBs; the first time-frequency resource set is determined, and the first time-frequency resource set is used to map the phase tracking reference signal PTRS, and the PTRS is used In demodulating the first data; sending the first data, wherein the remaining time-frequency resource set is used to map the first data, and the remaining time-frequency resource set is a preset time-frequency resource set divided by the first data A set of time-frequency resources and a set of time-frequency resources other than the second set of time-frequency resources.

Optionally, the above-mentioned first data is not mapped between the first time-frequency resource set and the second time-frequency resource set and may also be described as: the first data is based on the first time-frequency resource set and the second time-frequency resource set. The resource collection performs rate matching.

It should be understood that the above-mentioned remaining time-frequency resource set used for mapping the first data can be understood as part of the remaining time-frequency resource set used for mapping the first data; or it can be understood as the remaining time-frequency resource set All time-frequency resource sets are used to map the first data.

According to the method for data transmission provided by the embodiments of the present application, the network device determines that the first data cannot be mapped on the time-frequency resource set carrying the first data based on the preset modulation and coding mode MCS and the preset number of resource blocks RB before sending data. A second set of time-frequency resources for data, and a first set of time-frequency resources that cannot be mapped to the first data on the set of time-frequency resources that carry the first data, and the first set of time-frequency resources can be used for mapping, demodulating, and A set of frequency resources of the PTRS of the data, after determining that the first set of time-frequency resources and the second set of time-frequency resources that cannot map the first data on the set of time-frequency resources carrying the first data, the network device sends 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 implementation manners of the third aspect, the method further includes: determining the subcarriers occupied by the second time-frequency resource set in one RB; and determining the time of the second time-frequency resource set The starting position of the domain.

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

The first data and the second data use different transmission ports; in other words, the first data and the second data correspond to different DMRS ports; in other words, the first data and the second data are different codewords; in other words, the first data and the second data are different codewords; The data and the second data correspond to different TBs; in other words, the first data and the second data correspond to different transmission layers; in other words, the spatial filtering information of the first data and the second data are different; in other words, the first data The same carrier is occupied by the second data; in other words, the first data and the second data occupy the same BWP.

Wherein, the second time-frequency resource set used to carry the second PTRS can be understood as part of the second time-frequency resource set used to carry the second PTRS; or it can also be understood as the second time-frequency resource set All time-frequency resource sets of are used to carry the second PTRS.

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

Exemplarily, the time domain start position of the second time-frequency resource set is not later than the time domain start position of the first data.

With reference to the third aspect, in some implementations of the third aspect, the determining the subcarriers occupied by the second time-frequency resource set in one RB includes: directly determining that the second time-frequency resource set is in one RB Or, determining the demodulation reference signal DMRS port number associated with the second time-frequency resource set, where the DMRS port number indicates the sub-carrier occupied by the second time-frequency resource set in one RB.

Optionally, determining the DMRS port number associated with the second time-frequency resource set specifically includes determining the DMRS port number associated with the second time-frequency resource set according to the first DMRS port number in the DCI where the first data is scheduled. Wherein, 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, specifically, different CDM groups are occupied. Or, according to the second DMRS port number in the DCI where the first data is scheduled, the second DMRS port number is different from the first DMRS port number.

According to the method for data transmission provided by the embodiment of the present application, when determining the frequency domain position of the second time-frequency resource set, the network device may directly specify which subcarriers the second time-frequency resource set occupies in each RB Or, indirectly indicate which subcarriers the second time-frequency resource set occupies in each RB. For example, by indicating the DMRS port number associated with the second time-frequency resource set, and determining which sub-carriers the second time-frequency resource occupies in each RB according to the correspondence between the DMRS port number predefined in the protocol and the subcarriers in one RB , 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 time-frequency resource set in one RB include: a first subcarrier, wherein the first subcarrier in one RB The carrier is different from the subcarrier occupied by the DMRS used to demodulate the first data.

According to the method for data transmission provided in the embodiments of the present application, the network device determining which subcarriers the second time-frequency resource set occupies in each RB may be occupied by the DMRS used to demodulate the first data in one RB. One of the subcarriers other than the subcarriers is used as the subcarrier occupied by the second time-frequency resource set, so that only the subcarrier occupied by the DMRS that demodulates the first data needs to be determined can determine the subcarrier occupied by the second time-frequency resource set .

It should be understood that the DMRS used to demodulate the first data may be referred to as the first DMRS. The port number of the first DMRS is determined based on the first downlink control information DCI. That is to say, in some implementations of the third aspect, the above method further includes: sending a first DCI, where the first DCI is used to schedule the first data, and the first DCI is used to indicate the 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 the first type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001 One, the first subcarrier is a subcarrier preset in an odd number within an RB, wherein the first DMRS is the DMRS port number corresponding to the DMRS used to demodulate the first data; if The first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1002 and 1003, and the first subcarrier is a subcarrier preset in an even number in an RB; If the first DMRS is of the second type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001, the first subcarrier is one RB and the numbers are 0, 1, 6, 7 If the first DMRS is of the second type and the first DMRS port number includes at least one of the port numbers 1002, 1003, 1004, and 1005, the first The subcarrier is a preset subcarrier numbered 0, 1, 6, and 7 in one RB. Among them, the port numbers 1000, 1001, 1004, 1005 of the first type of DMRS belong to CDM group 0, the port numbers of the first type DMRS 1002, 1003, 1006, and 1007 belong to CDM group 1; the port number of the second type of DMRS 1000, 1001, 1006, 1007 belong to CDM group 0, the port numbers 1002, 1003, 1008, 1009 of the second type of DMRS belong to CDM group 1, and the port numbers of the second type DMRS 1004, 1005, 1010, 1011 belong to the CDM group 2.

According to the method for data transmission provided in the embodiments of the present application, which subcarrier within an RB is specifically the first subcarrier can be determined according to the type of the first DMRS port number and the specific port number, so that only the first DMRS needs to be determined. The port number can then determine the above-mentioned first subcarrier.

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 subcarrier preset among 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 among even-numbered subcarriers in one RB, the first subcarrier is a subcarrier numbered 0 in one RB; when the first subcarrier When it is a preset subcarrier in one RB except for numbers 0, 1, 6, and 7, the first subcarrier is a subcarrier numbered 2 in one RB; when the first subcarrier When it is a subcarrier numbered 0, 1, 6, and 7 in one RB, the first subcarrier is a subcarrier numbered 0 in one RB. Among them, the sub-carrier number is sequentially numbered from the sub-carrier with the highest frequency to the sub-carrier with the lowest frequency within 1 RB, or the sub-carrier number is from the sub-carrier with the lowest frequency to the sub-carrier with the highest frequency within 1 RB Number in sequence.

According to the method for data transmission provided by the embodiments of the present application, when it is determined that the first subcarrier can be any one of the multiple subcarriers in an RB, the subcarrier with the smallest number among the multiple subcarriers is generally selected as the For the first subcarrier, the subcarrier with the largest number may also be selected as the first subcarrier.

With reference to the third aspect, in some implementations of the third aspect, the demodulation reference signal DMRS port number associated with the second time-frequency resource set includes: a second DMRS port number, where the second DMRS port number The first DMRS port number corresponding to the DMRS that demodulates the first data is different.

According to the method for data transmission provided in the embodiments of the present application, the first DMRS and the second DMRS are in different CDM groups, that is, the network device determines that the DMRS port number associated with the second time-frequency resource set may be demodulated. Port numbers other than the first DMRS port number corresponding to the DMRS of the first data are used as the DMRS port number associated with the second time-frequency resource set, so that only the first DMRS port number needs to be determined to determine the second time-frequency resource set associated DMRS port number.

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

According to the method for data transmission provided by the embodiment of the present application, the second DMRS port number is specifically which port number in a CDM group can be determined according to the type of the first DMRS port number and the specific port number, so that only the first DMRS port number needs to be determined. A DMRS port number can determine the above-mentioned second DMRS port number.

With reference to the third aspect, in some implementations of the third aspect, the method further includes: sending high-layer signaling, wherein the high-layer signaling is used to indicate the second set of time-frequency resources.

According to the method for data transmission provided by 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 high-layer signaling, so that the terminal device can determine that it is not in the first data set. Demodulate the first data on the second time-frequency resource set.

In a fourth 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 and coding mode MCS, The frequency domain density of the second time-frequency resource set is determined according to the preset number of resource block RBs; the first time-frequency resource set is determined, the first time-frequency resource set is used for mapping PTRS, and the PTRS is used for demodulating the first data Receiving the first data, wherein the remaining time-frequency resource set is used to map the first data, and the remaining time-frequency resource set is a preset time-frequency resource set divided by the first time-frequency resource set and A set of time-frequency resources other than the second set of time-frequency resources.

Optionally, that the aforementioned first data is not mapped on the first time-frequency resource set and the second time-frequency resource set can also be described as: the first data is based on the first time-frequency resource set and the second time-frequency resource set. Frequency resource collection for rate matching.

According to the method for data transmission provided by the embodiment of the present application, the terminal device determines that the first data cannot be mapped on the time-frequency resource set carrying the first data based on the preset modulation and coding scheme MCS and the preset number of resource blocks RB before receiving the data. A second set of time-frequency resources for data, and a first set of time-frequency resources that cannot be mapped to the first data on the set of time-frequency resources that carry the first data, and the first set of time-frequency resources is used for mapping and demodulating the first data For the frequency resource set of the PTRS, 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 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, thereby improving the performance of receiving data.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the method further includes: determining the subcarrier occupied by the second time-frequency resource set in one RB; and determining the time of the second time-frequency resource set The starting position of the domain.

According to the method for data transmission provided by the embodiment of the present application, the terminal device also needs to determine the frequency domain position and the time domain position of the second time-frequency resource set when determining the second time-frequency resource set. The frequency domain position is understood as the 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 the subcarriers occupied by the second time-frequency resource set in one RB includes: directly determining that the second time-frequency resource set is in one RB Or, determining the demodulation reference signal DMRS port number associated with the second time-frequency resource set, where the DMRS port number indicates the sub-carrier occupied by the second time-frequency resource set in one RB.

According to the method for data transmission provided in the embodiments 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 the second time-frequency resource set occupies in each RB Or, indirectly determine which subcarriers the second time-frequency resource set occupies in each RB. For example, by determining the DMRS port number associated with the second time-frequency resource set, the DMRS port number is used to determine which subcarriers the second time-frequency resource set occupies in each RB, in order to determine the frequency domain of the second time-frequency resource set The location provides flexible options.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the subcarriers occupied by the second time-frequency resource set in one RB include: the first subcarrier, wherein the first subcarrier in one RB The carrier is different from the subcarrier occupied by the DMRS used to demodulate the first data.

According to the method for data transmission provided in the embodiment of the present application, the terminal device determining which subcarriers the second time-frequency resource set occupies in each RB may be occupied by the DMRS used to demodulate the first data in one RB. One of the subcarriers other than the subcarriers is used as the subcarrier occupied by the second time-frequency resource set, so that only the subcarrier occupied by the DMRS that demodulates the first data needs to be determined can determine the subcarrier occupied by the second time-frequency resource set .

With reference to the fourth aspect, in some implementations of the fourth aspect, the first subcarrier includes: if the first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001 One, the first subcarrier is a subcarrier preset in an odd number within an RB, wherein the first DMRS is the DMRS port number corresponding to the DMRS used to demodulate the first data; if The first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1002 and 1003, and the first subcarrier is a subcarrier preset in an even number in an RB; If the first DMRS is of the second type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001, the first subcarrier is one RB and the numbers are 0, 1, 6, 7 If the first DMRS is of the second type and the first DMRS port number includes at least one of the port numbers 1002, 1003, 1004, and 1005, the first The subcarrier is a preset subcarrier numbered 0, 1, 6, and 7 in one RB. Among them, the port numbers 1000, 1001, 1004, 1005 of the first type of DMRS belong to CDM group 0, the port numbers of the first type DMRS 1002, 1003, 1006, and 1007 belong to CDM group 1; the port number of the second type of DMRS 1000, 1001, 1006, 1007 belong to CDM group 0, the port numbers 1002, 1003, 1008, 1009 of the second type of DMRS belong to CDM group 1, and the port numbers of the second type DMRS 1004, 1005, 1010, 1011 belong to the 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 subcarrier preset among 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 among even-numbered subcarriers in one RB, the first subcarrier is a subcarrier numbered 0 in one RB; when the first subcarrier When it is a preset subcarrier in one RB except for numbers 0, 1, 6, and 7, the first subcarrier is a subcarrier numbered 2 in one RB; when the first subcarrier When it is a subcarrier numbered 0, 1, 6, and 7 in one RB, the first subcarrier is a subcarrier numbered 0 in one RB. Among them, the sub-carrier number is sequentially numbered from the sub-carrier with the highest frequency to the sub-carrier with the lowest frequency within 1 RB, or the sub-carrier number is from the sub-carrier with the lowest frequency to the sub-carrier with the highest frequency within 1 RB Number in sequence.

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

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

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

With reference to the fourth aspect, in some implementations of the fourth aspect, the method further includes: receiving first downlink control information DCI, where the first DCI is used to schedule the first data; and the first DCI Used to indicate the first DMRS port number.

According to the method for data transmission provided by the embodiment of the present application, before demodulating the first data, the terminal device will receive the first DCI issued by the network device for scheduling the first data, and the first DCI can indicate the aforementioned The first DMRS port number.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the physical downlinks corresponding to the first DCI and the second DCI The control channel configuration parameters are different; in other words, the demodulation reference signal DMRS ports indicated by the first DCI and the second DCI belong to different code division multiplexing CDM groups; in other words, the control resource set occupied by the first DCI and the second DCI occupy In other words, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP; in other words, the scrambling code of the first DCI and the second DCI The scrambling codes are different; in other words, the HARQ process group in which the HARQ process code indicated by the first DCI is in is different from the HARQ process group in which the HARQ process code indicated by the second DCI is in different; in other words, the transmission beam indicated by the first DCI and the first The sending beams indicated by the second DCI are different; in other words, the sending beam group indicated by the first DCI and the sending beam group indicated by the second DCI are different.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the method further includes: receiving high-layer signaling, where the high-layer signaling is used to indicate the second time-frequency resource set.

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

In a fifth aspect, a method for data transmission is provided, including: sending first downlink control information DCI and at least one second DCI, wherein the at least one second DCI is respectively used to schedule at least one second data, The first DCI is used to schedule first data; 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 the The positional relationship of the set of time-frequency resources occupied by the first data and the second data, where the positional relationship includes at least one of the following: the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap ; The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap; the time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.

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

With reference to the fifth aspect, in some implementations of the fifth aspect, the position relationship is used to determine the frequency domain density of the second time-frequency resource set; if the time domain resources occupied by the first data and the second data respectively And/or the frequency domain resources completely overlap, 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 data and the second data partially overlap, the frequency domain density of the second time-frequency resource set Equal to X, the X is determined according to the first field or the high-level configuration parameters, and the value of X is 2 or 4; and/or the position relationship is used to determine the frequency domain of the first time-frequency resource set Density; if the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, the frequency domain density of the first time-frequency resource set is equal to the frequency of the second time-frequency resource set Domain density, 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 occupied by the first data and the second data respectively Or the frequency domain resources partially overlap, 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 is determined according to high-level configuration parameters, and the value of Y is 2 or 4. Wherein, the second time-frequency resource set is used to carry the second PTRS, and the second PTRS is used to parse the second data; the first time-frequency resource set is used to carry the first PTRS, and the first PTRS is used to parse the first data.

In a sixth aspect, a method for data transmission is provided, including: receiving first downlink control information DCI and at least one second DCI, the at least one second DCI corresponds to at least one second data in a one-to-one correspondence, wherein, The first DCI is used to demodulate first data, and the second DCI is used to demodulate corresponding second data; the first DCI includes a first field, the second DCI includes a second field, and the The first field or the second field is used to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data respectively, and the position relationship includes at least one of the following: first data and second data The time domain resources and/or frequency domain resources occupied respectively completely overlap; the time domain resources and/or frequency domain resources occupied respectively by the first data and the second data partially overlap; the time domain resources occupied by the first data and the second data respectively And/or frequency domain resources do not overlap.

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

With reference to the sixth aspect, in some implementation manners of the sixth aspect, the position relationship is used to determine the frequency domain density of the second time-frequency resource set; if the time domain resources occupied by the first data and the second data respectively And/or the frequency domain resources completely overlap, 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 data and the second data partially overlap, the frequency domain density of the second time-frequency resource set Equal to X, the X is determined according to the first field or the high-level configuration parameters, and the value of X is 2 or 4; and/or the position relationship is used to determine the frequency domain of the first time-frequency resource set Density; if the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, the frequency domain density of the first time-frequency resource set is equal to the frequency of the second time-frequency resource set Domain density, 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 occupied by the first data and the second data respectively Or the frequency domain resources partially overlap, 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 is determined according to high-level configuration parameters, and the value of Y is 2 or 4. The second time-frequency resource set is used to carry the second PTRS, and the second PTRS is used to parse the second data; the first time-frequency resource set is used to carry the first PTRS, and the first PTRS is used to parse the first data.

In a seventh aspect, a device for data transmission is provided. The device can be used to implement the first, third, fifth and any possible implementation manners of the first, third, and fifth aspects The operation of the network equipment in. Specifically, the device for data transmission includes means for performing the steps or functions described in the first, third, and fifth aspects above. The means may be the first, third, and fifth aspects. Aspects of network equipment or internal chips or functional modules of network equipment. The steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.

In an eighth aspect, a device for data transmission is provided. The device can be used to perform any of the second, fourth, sixth, and second, fourth, and sixth aspects. The operation of the terminal device in the implementation mode. Specifically, the device for data transmission may include means for performing the steps or functions described in the second, fourth, and sixth aspects above. The means may be the second, fourth, The sixth aspect of the terminal device or the internal chip of the terminal device or the terminal device. The steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.

In a ninth aspect, a device for data transmission is provided, including a processor, a transceiver, and a memory, where the memory is used to store a computer program, and the transceiver is used to execute any one of the first to sixth aspects In a possible implementation manner, for the transceiving step in the method for data transmission, the processor is used to call and run the computer program from the memory, so that the device for data transmission executes any one of the first to sixth aspects. The method used for data transmission in the implementation mode.

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

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

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

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

In an eleventh aspect, a computer program product is provided. The computer program product includes: a computer program (also called code, or instruction), which when the computer program is executed, causes the computer to execute any of the first to sixth aspects. One of the possible implementation methods.

In a twelfth aspect, a computer-readable medium is provided, and the computer-readable medium stores a computer program (also referred to as code, or instruction) when it runs on a computer, so that the computer executes the first to sixth aspects above Any one of the possible implementation methods.

In a thirteenth aspect, a chip system is provided, including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device installed with the chip system executes The method in any one of the possible implementation manners of the foregoing first to sixth aspects.

Description of the drawings

Fig. 1 is a schematic diagram of a wireless communication system suitable for an embodiment of the present application.

(A) and (b) in FIG. 2 are schematic diagrams of receiving downlink control information by a terminal device provided in an embodiment of the present application.

Fig. 3 is a schematic diagram of multiple network devices sending multiple downlink control information.

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

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

FIG. 6 is a schematic diagram of specific embodiment one provided by the embodiments of the present application.

FIG. 7 is a schematic diagram of the device 10 for data transmission proposed in this application.

FIG. 8 is a schematic structural diagram of a terminal device 20 applicable to an embodiment of the present application.

FIG. 9 is a schematic diagram of the device 30 for data transmission proposed in this application.

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

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (NR), etc.

The terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The terminal device can 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), and a wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application does not limit this.

The network device in the embodiment of the present application may be a device for communicating with a terminal device. It should be understood that the network device in the wireless communication system may be any device with a wireless transceiver function. The equipment includes, but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (Node B, NB), Base Station Controller (BSC) , Base transceiver station (Base Transceiver Station, BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), baseband unit (BaseBand Unit, BBU), wireless fidelity (Wireless Fidelity, WIFI) system Access point (Access Point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as NR , The gNB in the system, or the transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or the network node that constitutes the gNB or transmission point, Such as baseband unit (BBU), or 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). CU implements part of the functions of gNB, and DU implements part of the functions of gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions. The DU is responsible for processing physical layer protocols and real-time services, and realizes the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer. AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU , Or, sent by DU+AAU. It can be understood that the network device may be a device that includes one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into network equipment in an access network (radio access network, RAN), or the CU can be divided into network equipment in a core network (core network, CN), which is not limited in this application.

In the embodiment of the present 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 memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiments of the present application do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the present application, as long as the program that records the code of the method provided in the embodiments of the present application can be provided according to the embodiments of the present application. For example, the execution subject of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute the program.

In addition, various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CDs), digital versatile discs (digital versatile discs, DVDs) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). In addition, various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

Fig. 1 is a wireless communication system 100 suitable for an embodiment of the present application. The wireless communication system 100 may include at least one network device, for example, the first network device 110 and the second network device 120 shown in FIG. 1. Both the first network device 110 and the second network device 120 can communicate with the terminal device 130 through a wireless air interface. The first network device 110 and the second network device 120 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located in the coverage area.

The wireless communication system 100 further includes one or more user equipment (UE) 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 fixed. 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 can support coordinated multipoint (CoMP) transmission, that is, multiple cells or multiple transmission points (serving transmission reception points, serving TRP) can cooperate to communicate to the same time-frequency resource set. The terminal device sends data or sends data to the same terminal device on partially overlapping time-frequency resource sets or sends data to the same terminal device on different time-frequency resource sets. Wherein, the multiple 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 instruction, and the like.

The terminal device 130 in the wireless communication system 100 can support multipoint transmission, that is, the terminal device 130 can communicate with the first network device 110 or the second network device 120, where the first network device 110 can serve as Serving network equipment. Serving network equipment refers to the provision of radio resource control (RRC) connection, non-access stratum (NAS) mobility management and security input for terminal equipment through the wireless air interface protocol Service network equipment.

Optionally, the first network device may be a serving network device, and the second network device may be a cooperative network device; or, the first network device may be a cooperative network device and the second network device may be a serving network device. Wherein, the serving network device may send control signaling to the terminal device, and the cooperative network device may send data to the terminal device; or, the serving network device may send control signaling to the terminal device, the serving network device and the cooperative network device Data can be sent to the terminal device at the same time, or the serving network device and the cooperative network device can send control signaling to the terminal device at the same time, and the serving network device and the cooperative network device can send data to the terminal device at the same time. The embodiment of the present application does not specifically limit this.

Taking the first network device as the service network device, and the second network device as the cooperative network device as an example, the number of the second network device can be one or more, and the number of the second network device and the first network device are different quasi- co-location, QCL) network equipment. Among them, the antenna port QCL is defined as the signal sent from the antenna port of the QCL will undergo the same large-scale fading. Large-scale fading includes delay spread, Doppler spread, Doppler shift, average channel gain, and average delay. .

It can be understood that both the first network device and the second network device may 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 also be noted that the embodiments of the present application are also applicable to the same network device with non-QCL antenna ports. That is, the network device can be configured with different antenna panels, the antenna ports belonging to different antenna panels in the same network device may be non-QCL, and the corresponding cell-specific reference signal (CRS) resource configuration may also be possible Is different.

In order to facilitate the understanding of the embodiments of the present application, before describing the method for data transmission in the embodiments of the present application, a few basic concepts and the mapping relationship between codewords to layers and layers to antenna ports are briefly introduced.

1. Time-frequency resource collection.

In the new radio access technology (NR) system of 3GPP, the downlink resources of the system are divided into multiple orthogonal frequency division multiple access (OFDM) symbols in terms of time. , In terms of frequency, it is divided into several sub-carriers.

The physical downlink control channel (PDCCH) in the downlink usually occupies the first two or the first three OFDM symbols in a subframe. The PDCCH is used to carry downlink control information (downlink control information, DCI).

The DCI sent by the network device to the terminal device carries terminal device-specific resource allocation control information and terminal device-specific control information or other control information shared by the cell. The physical uplink shared channel (PUSCH) in the uplink of the system is used to carry the uplink transmission data, and the discrete Fourier transform is usually used to extend the orthogonal frequency division multiple access (discrete fourier transform spread orthogonal frequency division multiple access). frequency division multiple (DFT-S-OFDM) generates frequency domain signals. Generally, a slot usually includes 14 OFDM symbols. The size of a physical resource block (PRB) is also defined in the system. A PRB includes 12 subcarriers in the frequency domain, and a certain subcarrier in a certain OFDM symbol is called a resource element (RE). Specifically, in this application, the PRB may be referred to as a resource block (resource block, RB).

2. Scrambling.

The current protocol supports the transmission of up to two code words. Each codeword (for example, codeword q) corresponds to a set of bits

among them,

Is the number of bits of the codeword transmitted in the physical downlink shared channel, after the following scrambling operations:

Obtain a set of bits corresponding to the scrambled codeword

Where c ^(q) (i) is the scrambling sequence.

3. Modulation.

For each codeword (for example, codeword q), the scrambled codeword will use the modulation method shown in Table 1 to obtain a set of complex-valued modulation symbols:

Table 1 Modulation method

调制方式(modulation scheme)Modulation scheme	调制阶数(modulation order) Modulation order

QPSKQPSK	22
16QAM16QAM	44
64QAM64QAM	66
256QAM256QAM	88

Specifically, the quadrature phase shift keying (QPSK) in Table 1 is a digital modulation method. It is divided into absolute phase shift and relative phase shift. Since the absolute phase shift method has a phase ambiguity problem, the relative phase shift method is mainly used in practice. It has been widely used in wireless communications and has become a very important modulation and demodulation method in modern communications.

16 Quadrature amplitude modulation (quadrature amplitude modulation, QAM), 64QAM and 256QAM. Among them, quadrature amplitude modulation is a digital modulation method. 16QAM refers to a QAM modulation method that contains 16 kinds of symbols; 256QAM is a quadrature amplitude modulation with a hexadecimal digital signal, and 16*16=256 points on the constellation diagram.

4. Layer mapping and antenna port mapping.

User plane data and signaling messages need to pass through the packet data convergence protocol (PDCP) or radio link control (RLC) or media access control (media access control) before being sent out through the air interface at the physical layer. Access control, MAC) layer processing.

The data processed at the physical layer is a protocol data unit (PDU) of the MAC layer, that is, a data stream. The data stream from the upper layer is called codeword after channel coding. Different codewords distinguish different data streams. Since the number of codewords is inconsistent with the number of transmitting antennas, the codewords can be mapped to different transmitting antennas, so layer mapping and precoding are required. Among them, layer mapping can be understood as remapping codewords to multiple layers according to certain rules; precoding can be understood as mapping data mapped to multiple layers to different antenna ports.

The network device encodes the data to obtain codewords, maps the codewords to layers, and then maps the data mapped to multiple layers to antenna ports, sends data to the terminal device through the corresponding antenna port, and sends the solution through the corresponding antenna port Modulation reference signal (demodulation reference signal, DMRS), so that the terminal device can demodulate the received data according to the DMRS to obtain the original data.

It should be noted that the antenna port can be understood as a transmitting antenna that can be recognized by the receiving end device, or a transmitting antenna that can be received separately in space. At this time, the antenna port can be understood as a virtual antenna port, that is, it is not connected to a certain one. The physical antennas directly correspond, but are formed after multiple physical antennas are virtualized. The antenna port may be defined according to the reference signal (or pilot signal, for example, DMRS or CRS, etc.) associated with the antenna port. For example, different antenna ports correspond to different types of reference signals. Different antenna ports may also correspond to the same type of reference signal. In this case, different antenna ports are a concept of space, that is, reference signals corresponding to different antenna ports on the same time-frequency resource are distinguished by spatial orthogonality. An antenna port can be a physical antenna on the transmitting end device, or a weighted combination of multiple physical antennas on the transmitting end device. In the embodiment of the present application, unless otherwise specified, one antenna port corresponds to one reference signal port. Specifically, the modulation symbols after the above modulation are mapped to one or more layers according to the correspondence relationship shown in Table 2. Modulation symbol for each codeword

Is mapped to the layer x(i)=[x ⁽⁰⁾ (i)...x ^(υ-1) (i)] ^T ,

Where v is the number of transmission layers,

Is the number of modulation symbols per layer. The vector x(i)=[x ⁽⁰⁾ (i)...x ^(υ-1) (i)] ^T is mapped to the antenna port according to the following formula:

among them,

For a terminal device, NR supports a maximum of 8 layers of downlink data transmission at this stage, where each codeword supports a maximum of 4 layers of downlink transmission, and each codeword corresponds to its own independent modulation and coding scheme (modulation and coding scheme). , MCS), the DCI contains the MCS field corresponding to each codeword, and this field indicates the modulation mode, target code rate and spectral efficiency information.

Table 2 Codeword to layer mapping

5. Resource mapping.

Antenna port

When the data that needs to be transmitted is mapped to the resource element (resource element, RE) in the PRB, the network devices and terminal devices that need to transmit the data follow the following rules:

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

(2) The RE in the corresponding PRB is not used to transmit the phase tracking reference signal (phase tracking reference signal, PTRS) corresponding to the data. PTRS is used for terminal equipment to perform phase noise compensation (PNC) of the received signal when demodulating data to obtain more accurate channel estimation.

For example, common phase error (CPE) will affect the time-domain channel estimation. The phase noise on each OFDM symbol will fluctuate randomly, and the channel estimation obtained on a certain OFDM symbol (usually based on DMRS) When applied to other OFDM symbols, phase deviation and inter-carrier interference (ICI) may occur.

The network equipment indicates data scheduling information through DCI, including:

1) The set of time-frequency resources occupied by the physical downlink shared channel (PDSCH) used to carry data. The indication method is resource block orthogonal frequency division multiple access (resource block orthogonal frequency division multiple, RB -OFDM) symbol granularity bitmap, that is, whether each bit corresponds to a specific RB-OFDM symbol to map data;

2) The DMRS port number and the number of ports associated with the PDSCH. Among them, multiple orthogonal DMRS ports are supported in NR, and each orthogonal DMRS port corresponds to a specific port number to support multi-terminal device paired transmission (each The terminal equipment respectively occupies different orthogonal DMRS ports), the number of DMRS ports corresponds to the number of data transmission layers, that is, each layer of data corresponds to a DMRS port for channel estimation.

Two types of DMRS are supported in NR:

The first DMRS type: supports up to 8 orthogonal DMRS ports.

The second DMRS type: supports up to 12 orthogonal DMRS ports.

3) The number of codewords corresponding to the data carried by the PDSCH, each codeword can correspond to an independent modulation coding scheme (Modulation coding scheme, MCS), redundancy version (Redundancy version, RV), new data transmission indication (New Data indication) ).

6. PTRS.

The PTRS sent by the network device is only mapped in the RB occupied by the PDSCH, that is, the PTRS is sent only when data is scheduled. The method for mapping the PTRS to physical resources in the time-frequency domain includes:

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

The time domain density is determined based on the indication value of the MCS field in the DCI scheduling the PDSCH, as shown in Table 3 below, where ptrs-MCS1, ptrs-MCS2, ptrs-MCS3, and ptrs-MCS4 are the threshold values reported by the terminal device. When the MCS value indicated in the DCI (I _MCS as shown in Table 3) is within different MCS threshold ranges, the corresponding PTRS time domain density (L _PT-RS as shown in Table 3) will change, such as MCS When it is between ptrs-MCS1 and ptrs-MCS2, time domain density = 4 means that there is an RE occupied by PTRS for every 4 OFDM symbols in the time domain; for example, when MCS is between ptrs-MCS3 and ptrs-MCS4, the time domain density =1 means that each OFDM symbol in the time domain has an RE occupied by a PTRS.

Table 3 PTRS time domain density

调度的MCSScheduled MCS	时域密度(L _PT-RS) Time domain density (L _PT-RS )
I _MCS<ptrs-MCS1 I _MCS <ptrs-MCS1	PT-RS不存在PT-RS does not exist
ptrs-MCS1≤I _MCS<ptrs-MCS2 ptrs-MCS1≤I _MCS <ptrs-MCS2	44
ptrs-MCS2≤I _MCS<ptrs-MCS3 ptrs-MCS2≤I _MCS <ptrs-MCS3	22
ptrs-MCS3≤I _MCS<ptrs-MCS4 ptrs-MCS3≤I _MCS <ptrs-MCS4	11

Among them, the MCS values shown in Table 3 are within different MCS threshold ranges, which can be referred to as different MCS levels. For example, when I _MCS <ptrs-MCS1, it is called MCS level 1, and when ptrs-MCS1≤I _MCS <ptrs-MCS2, it is called MCS level 2, and when ptrs-MCS2≤I _MCS <ptrs-MCS3, it is called MCS level. 3. When ptrs-MCS3≤I _MCS <ptrs-MCS4, it is called MCS level 4. And, the MCS level corresponds to the time domain density of PTRS one-to-one.

In the frequency domain: mapping within the bandwidth occupied by the PDSCH according to a certain frequency domain density, the frequency domain density is determined based on the number of RBs N _RB indicated by the frequency domain resource allocation field in the DCI scheduling the PDSCH, as shown in Table 4. Among them, N _RB0 and N _RB1 are thresholds reported by the terminal device.

Table 4 PTRS frequency domain density

RB数量Number of RB	频域密度(K _PT-RS) Frequency domain density (K _PT-RS )
N _RB<N _RB0 N _RB <N _RB0	PTRS不存在PTRS does not exist
N _RB0≤N _RB<N _RB1 N _RB0 ≤N _RB <N _RB1	22
N _RB1≤N _RB N _RB1 ≤N _RB	44

Wherein, the number of RBs shown in Table 4 is within different RB number threshold ranges, which can be referred to as different RB number levels. For example, when N _RB <N _RB0 , it is called RB number level 1, and when N _RB0 ≤ N _RB <N _RB1 , it is called RB number level 2, and when N _RB1 ≤ N _RB , it is called RB number level 3. In addition, the RB number level corresponds to the frequency domain density of the PTRS one to one.

When the number of RBs N _RB indicated in the DCI is within different RB threshold ranges, the corresponding PTRS frequency domain density will change. For example, when N _{RB is} between N _RB0 and N _RB1 , frequency domain density = 2 means every 2 RB has an RE occupied by PTRS. The specific frequency domain resource mapping of PTRS is determined according to the following formula:

Among them, k is the sub-carrier position occupied by PTRS, where

Is the sub-carrier offset occupied in one RB,

Determine 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 the RE offset (resource element offset) configured by high-level signaling

K _PT-RS is the PTRS frequency domain density, i=0,1,2,..., N _RB is the number of RBs indicated in the DCI, and n _RNTI is the sequence value used for scheduling the DCI of the PDSCH.

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

Table 5 PTRS subcarrier position offset value

7. Multi-site cooperative transmission mechanism

In downlink transmission, the terminal device can communicate with multiple network devices at the same time, that is, the terminal device receives data from multiple network devices at the same time. This transmission mode is called CoMP for multi-site cooperative transmission. The multiple network devices form a cooperating set to communicate with the terminal device at the same time. The network devices in the cooperating set can each connect to different control nodes, and each control node can exchange information, such as interactive scheduling policy information to achieve cooperative transmission Or, the network devices in the cooperating set are all connected to the same control node, and the control node receives the channel state information (such as channel state information (CSI) or CSI) reported by the terminal device collected by the network devices in the cooperating set Reference signal received power (RSRP), and perform unified scheduling on the terminal devices in the cooperating set according to the channel state information of all terminal devices in the cooperating set, and then interact the scheduling policy to the network devices connected to it, and then Each network device notifies each terminal device through the DCI signaling carried by the PDCCH. According to the transmission strategy of multiple network devices in the cooperation set to a certain terminal device, the CoMP transmission mode includes:

Dynamic Point Switching (DPS): In view of the dynamic changes of a certain terminal device's data transmission network equipment, try to choose a network device with better channel conditions for data scheduling of the current terminal device, that is, multiple network equipment time sharing Transmit data for a terminal device;

Coherent joint transmission (CJT): Multiple network devices transmit data for a terminal device at the same time, and the antennas of multiple network devices perform joint precoding, that is, select the optimal precoding matrix for multiple network device antennas Joint phase and amplitude weighting. This mechanism requires the phase calibration of the antennas of multiple network devices so that the multiple groups of antennas can perform accurate phase weighting;

Non-coherent joint transmission (NCJT): Multiple network devices transmit data for a terminal device at the same time, and the antennas of multiple network devices are independently precoded, that is, each network device independently selects the optimal precoding matrix Perform joint phase and amplitude weighting between the antennas of the network device. This mechanism does not require the antennas of multiple network devices to perform phase calibration.

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, due to the close distance between network devices or between network devices and the central node, or relying on optical fiber connections with less transmission loss, the interaction delay can be ignored. At this time, it can be considered that there is a serving transmission point (serving transmission reception point, serving TRP) in the network devices in the cooperation set, or it is called a serving cell (serving cell) or a serving network device. The role of the service network device is to make data communication scheduling decisions for the terminal device, and to perform MAC layer and physical layer communication with the terminal device. For example, the serving network device determines the PDCCH and PUSCH or PDSCH time-frequency resource set of the terminal device according to the scheduling decision, and sends DCI signaling in the PDCCH, and sends data, reference signal (RS), etc. in the PUSCH or PDSCH. Wait.

Except for the serving network equipment in the cooperation set, the remaining network equipment is called coordinate transmission reception point (coordinate TRP), or coordinate cell (coordinate cell), cooperative network equipment. 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 cooperative network device sends DCI signaling in PDCCH, sends data in PUSCH or PDSCH, sends RS, etc. according to the scheduling decision of the serving network device.

In the IB scenario, the scheduling instruction of the serving network device supports one DCI transmission, as shown in Figure 2 (a), which is a schematic diagram of the terminal device provided in an embodiment of the present application receiving downlink control information. The schematic diagram includes the service network equipment TRP#1, the cooperation network equipment TRP#2, and the terminal equipment supporting CoMP.

Among them, TRP#1 is used as the serving network device to make the scheduling decision of the terminal device and uses 1 DCI to send the scheduling instruction. The DCI may indicate to schedule TRP#1 or TRP#2 for data transmission; it may also indicate to schedule TRP#1 and TRP#2 for data transmission at the same time. At this time, the DCI will carry the scheduling information of two TRPs (TRP#1 and TRP#2 as shown in Figure 2(a)).

For example, two codewords respectively correspond to data transmission of two TRPs, and the MCS information corresponding to each codeword respectively corresponds to the modulation and coding mode of the data sent by the two TRPs. Further, DMRS ports need to be grouped. Each group of DMRS ports corresponds to a codeword. The grouping principle belongs to different DMRS groups according to different code division multiplexing (CDM). As shown in Table 5, DMRS port 1000 , 1001 is the same CDM group and can be used as a DMRS group; DMRS ports 1002 and 1003 are the same CDM group and can be used as another DMRS group. Since it is difficult to perform frequency offset calibration between different TRPs, different TRPs need to be configured with different PTRS, that is, each DMRS group corresponds to one PTRS. Each PTRS determines the time-frequency resource set according to its respective configuration.

According to the above codeword to layer mapping relationship, each codeword corresponds to its own DMRS port, different codewords correspond to different DMRS ports, and the DMRS ports corresponding to different codewords belong to different code division multiplexing (code division multiplexing, CDM) group, DMRS ports of different CDM groups occupy different subcarriers in each RB, and DMRS ports of the same CDM group occupy the same subcarriers in each RB.

Different TRPs may have different QCL hypotheses, and the QCL hypotheses of the DMRS port can be notified by different TRPs respectively.

In the IB scenario, the scheduling instructions of the serving network device also support two DCI transmissions, as shown in Figure 2(b), which includes the serving network device TRP#1, the cooperative network device TRP#2, and the terminal that supports CoMP equipment.

Among them, two DCIs can be sent by two network devices (TRP#1 and TRP#2 as shown in Figure 2(b)) respectively, and the two DCIs respectively carry PDSCH#1 and PDSCH# transmitted by two TRPs. The scheduling information of 2, that is, the two DCIs respectively carry the position of the time-frequency resource set occupied by the two PDSCHs, the associated DMRS port number, the number of DMRS ports, the MCS, etc., which increases the flexibility of scheduling.

In the NIB scenario, due to the long distance between network devices or the copper wire connection between the network devices, the interaction delay is 2-5ms, and may even reach 30ms. At this time, if the framework of the central control node controlling multiple cooperative network devices is still adopted, the scheduling information will become invalid due to the interaction delay, which will affect the performance of the entire system. Therefore, in this scenario, a mechanism for multiple coordinated network devices to independently schedule the data and RS of the terminal device is introduced. At this time, it is necessary to support each coordinated network device to independently indicate DCI. Multiple coordinated network devices will determine what to do according to their own scheduling strategy. Dispatch the terminal device at time. When multiple cooperative network devices schedule the terminal device at the same time according to their respective scheduling decisions, the terminal device will receive multiple DCIs at the same time to schedule their respective PDSCHs (with independent resource allocation and MCS), as shown in Figure 2 (b) . Each DCI schedules at least one codeword separately, and each codeword corresponds to an independent MCS indication and corresponds to a different DMRS group. At this time, each DCI corresponds to an independent PTRS port.

It is worth noting 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. According to Table 5, it can be seen that the PTRS ports associated with the respective DMRS occupy different subcarriers, so the PTRS ports are also frequency-division orthogonal.

The basic concepts involved in this application are described in detail above. The following briefly describes how two network devices independently transmit their respective PDSCH scheduling information in a CoMP transmission scenario with reference to FIG. 3. Fig. 3 is a schematic diagram of multiple network devices sending multiple downlink control information. The schematic diagram includes TRP#1, TRP#2, PDSCH#1, and PDSCH#2.

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

As shown in Figure 3, suppose two TRPs (TRP#1 and TRP#2 shown in Figure 3) respectively schedule two PDSCHs (PDSCH#1 and PDSCH#2 shown in Figure 3) occupy the same time and frequency Resource collection. Within one RB, two PDSCHs use different DMRS groups to ensure that the DMRS frequency domain is orthogonal.

For TRP#1, PDSCH#1 does not map data on the time-frequency resource set occupied by TRP#1 non-zero power phase tracking reference signal (NZP PTRS), in order to avoid TRP#2 sending PTRS interference, TRP#1 will also configure a zero power phase tracking reference signal (ZP PTRS), this ZP PTRS and the PTRS sent by TRP#2 occupy the same time-frequency resource set, PDSCH# 1 Do not map data on this ZP PTRS. For PDSCH#2, there will be the same configuration method as PDSCH#1, which will not be repeated here.

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

Specifically, the terminal device determines the time domain resource density of ZP PTRS corresponding to PDSCH#1 based on the MCS level indicated by DCI#2 (for example, refer to Table 3 for different MCS levels corresponding to different PTRS time domain densities); The number level of scheduled RBs indicated by DCI#2 determines the frequency domain resource density of ZP PTRS corresponding to PDSCH#1 (for example, refer to Table 4 for different RB number levels corresponding to different PTRS frequency domain densities); based on DCI#2 The DMRS port indications in the table determine the subcarrier position of the ZP PTRS corresponding to PDSCH#1 (for example, refer to the different DMRS port numbers shown in Table 5 corresponding to different PTRS subcarrier positions); based on the PDSCH in DCI#2 The domain start position determines the time domain start position of the ZP PTRS corresponding to PDSCH#1.

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

The method shown in FIG. 3 for multiple network devices to transmit PDSCH scheduling information. In the above IB scenario, for the PDSCH#1 scheduled by TRP#1, the terminal device determines that the time-frequency resource set mapping of PDSCH#1 needs to be mapped. Based on the decoding and analysis of DCI#2 sent by TRP#2, it will affect the reception of PDSCH#1 when the DCI#2 cannot be decoded or analyzed correctly, that is, the decoding of DCI#2 must be completed correctly. Determine which REs of PDSCH#1 cannot be used for mapping data, so as to perform correct decoding. At the same time, even if DCI#2 can be decoded correctly, this solution needs to assume that both DCIs are decoded and analyzed before data reception can be performed. This is compared with data reception after only DCI#1 is decoded and analyzed. , It will increase the reception delay of PDSCH#1. The same is true for TRP#2.

In the method shown in FIG. 3 for multiple network devices to transmit PDSCH scheduling information, in the aforementioned NIB scenario, for the PDSCH#1 scheduled by TRP#1, there is also the aforementioned problem of increasing the reception delay of PDSCH#1. Further, although the terminal device can determine the time-frequency resource set of the ZP-PTRS corresponding to the PDSCH#1 based on the DCI#2 sent by the TRP#2 detection, thereby determining the RE location to which PDSCH#1 is mapped. Since the interaction between TRP#1 and TRP#2 is semi-static, TRP#1 cannot obtain DCI#2 to determine the location of the NZP PTRS time-frequency resource collection of TRP#2, so TRP#1 cannot pass DCI#2 like the terminal device. Determining the location of the time-frequency resource set of ZP PTRS corresponding to PDSCH#1 will cause inconsistency in the mapping of the time-frequency resource set of PDSCH#1 between TRP#1 and the terminal device. The same is true for TRP#2.

In summary, the method shown in Figure 3 for multiple network devices to send PDSCH scheduling information. In the CoMP scenario, when two network devices use two DCIs to schedule PDSCHs separately, the location of the ZP PTRS corresponding to each PDSCH needs to be Determined based on information provided by another DCI. In the IB scenario, the reliability and delay of PDSCH reception will be affected. In the NIB scenario, it will not only affect the reliability and delay of PDSCH reception, but also cause the network equipment and terminal equipment to have inconsistent understanding of ZP PTRS, thereby affecting the demodulation performance of PDSCH.

In order to solve the above-mentioned problem in the CoMP scenario, when at least one network device issues multiple DCIs to schedule multiple PDSCHs respectively, and determines the location of the RE mapped by PDSCH#1. This application proposes a method for data transmission. By indicating the time-frequency resource set of the ZP PTRS corresponding to each PDSCH, the position of the ZP PTRS corresponding to each PDSCH does not need to be determined based on the information provided by the DCI of another network device.

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

The method for data transmission provided by the embodiment of the present application will be described in detail below with reference to FIGS. 4-6.

FIG. 4 is a schematic diagram of a method for data transmission provided by an embodiment of the present application. The schematic diagram includes S110-S130. These steps are described in detail below.

In the method for data transmission provided by the embodiments of the present application, when a network device determines at least one preset time-frequency resource set that carries first data and at least one second data, it can determine which of the preset time-frequency resource sets are The time-frequency resource set can be used to map the first data and at least one second data.

It should be understood that the first data and the second data involved in this 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 is a different codeword; 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 It corresponds to a different transmission block with the second data; 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 part of the bandwidth.

It should also be understood that the first data and the second data are scheduled by different DCIs (first DCI and second DCI). Wherein, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the physical downlink control channel configuration parameters corresponding to the first DCI and the second DCI are different; in other words, the demodulation indicated by the first DCI and the second DCI The reference signal DMRS port belongs to different code division multiplexing CDM groups; in other words, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI are located on the same carrier; in other words, the control resource set occupied by the first DCI The control resource set occupied by the second DCI occupies the same BWP.

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

For example, the terminal device receives 3 codewords (first codeword, second codeword #1, and second codeword #2). Among them, the first codeword is carried in the preset time-frequency resource set #1, the second codeword #1 is carried in the preset time-frequency resource set #2, and the second codeword #2 is carried in the preset time. Frequency resource collection #3. The second codeword #1 corresponds to the second time-frequency resource set #1, and the second codeword #2 corresponds to the second time-frequency resource set #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 the preset time-frequency The remaining time-frequency resource collection in the resource collection.

For another example, multiple CORESETs are configured on each carrier or each BWP, and different CORESETs correspond to different TRPs, or in other words, different CORESETs are used to carry DCI 1 and DCI 2. Alternatively, multiple CORESET groups are further grouped, CORESET group 1 is used to carry DCI 1, and CORESET group 2 is used to carry DCI 2. At the same time, DCI 1 and DCI 2 will each independently correspond to a detection cycle, and the terminal will detect DCI 1 and DCI 2 according to the two detection cycles and two CORESET groups.

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

Specifically, the first time-frequency resource set can be understood as the first physical downlink shared channel PDSCH, and the first codeword can be understood as the data carried in the first PDSCH. Similarly, the second time-frequency resource set can be understood as the second PDSCH , The second codeword can be understood as the data carried in the second PDSCH.

Because the network device and the terminal device can determine which time-frequency resource sets in the preset time-frequency resource set are not mapped on the first codeword and the second codeword. Therefore, the terminal device does not need to complete the analysis of the downlink control information DCI corresponding to the first codeword and the second codeword as shown in FIG. 3 to determine which time-frequency resource sets the first codeword and the second codeword are not mapped on. . In addition, in the embodiment of the present application, the terminal device and the network device determine that the time-frequency resource sets that 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. Specifically, different codewords can correspond to different transmission points TRPs, that is, different codewords can be sent by different TRPs; different codewords can correspond to the same TRP, and different codewords can be sent by the same TRP.

Specifically, the key point in the embodiments of the present application is that the network device can determine which time-frequency resource sets in the preset time-frequency resource sets are not mapped to the above-mentioned first codeword and second codeword. The specific process includes:

S110. The network device determines a second time-frequency resource set, where the time-domain density of the second time-frequency resource set is determined according to a preset modulation and coding scheme MCS, and the frequency-domain density of the second time-frequency resource set is determined according to the preset The number of resource blocks RB is determined.

It can be understood that in the embodiment shown in FIG. 4, the network device can reuse the time-frequency resource set (first time-frequency resource set) mapped by the NZP PTRS (hereinafter referred to as PTRS) corresponding to the codeword in the prior art. The method of domain density and frequency domain density determines the time-frequency resource set mapped to the ZP PTRS (second time-frequency resource set) corresponding to the codeword. For example, the time domain density of the time-frequency resource set is determined based on the MCS shown in Table 3 above, and the frequency domain density of the time-frequency resource set is determined based on the number of RBs shown in Table 4 above.

Specifically, the time-domain density of the second time-frequency resource set involved in this application is determined according to the preset MCS means: determining the second time-frequency resource set according to the preset MCS and the first transmission capability value reported by the terminal device The first transmission capability value reported by the terminal device is used to determine the time domain density of the first PTRS corresponding to the first codeword; the frequency domain density of the second time-frequency resource set involved in this application is based on the prediction The determination of the number of RBs refers to determining the frequency domain density of the second time-frequency resource set according to the preset number of RBs and the third transmission capability value reported by the terminal device, where the third transmission capability value reported by the terminal device is used for Determine the frequency domain density of the first PTRS corresponding to the first codeword.

Specifically, the protocol defines the modulation mode, coding rate, etc. corresponding to each MCS index value in advance, and the terminal device reports the first transmission capability value x1, x2, where x1, x2 correspond to the thresholds of the 2 MCS index values, when the first DCI When the indicated MCS index value 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, when When the MCS index value indicated by the first DCI is greater than x2, the time domain density of the corresponding first PTRS is y3.

In the same way, the frequency domain density corresponding to the number of RBs is predefined in the protocol, and the terminal device reports the third transmission capability value y1, y2, where y1, y2 correspond to the threshold of the number of RBs. When the RB indicated by the first DCI When the number value 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. When the indicated MCS index value is greater than y2, the frequency domain density of the corresponding first PTRS is z3.

Exemplarily, the network device further determines the subcarriers occupied by the second time-frequency resource set in one RB; and determines the time domain start position of the second time-frequency resource set.

Further, determining the subcarriers occupied by the second time-frequency resource set in one RB by the network device includes: directly determining the subcarriers occupied by the second time-frequency resource set in one RB; or,

Indirectly determine the subcarriers occupied by the second time-frequency resource set in one RB, for example, determine the demodulation reference signal DMRS port number associated with the second time-frequency resource set, the DMRS port number indicates that the second time-frequency resource set is in one RB Occupied sub-carrier.

Further, the time domain start position of the second time-frequency resource set is no later than the time domain start position of the first codeword. Exemplarily, the subcarriers occupied by the second time-frequency resource set in one RB include: the first subcarrier, where the first subcarrier and the DMRS used to demodulate the first codeword in one RB occupy The subcarriers are different.

Specifically, the first subcarrier includes:

If the first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001, the first subcarrier is a subcarrier preset in an odd number in an RB; Further, in this case, the first subcarrier is a subcarrier numbered 1 in one RB. Wherein, the first DMRS is the DMRS port number corresponding to the DMRS that demodulates the first codeword;

If the first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1002 and 1003, the first subcarrier is a subcarrier preset in an even number in an RB ; Further, in this case, the first subcarrier is a subcarrier numbered 0 in one RB.

If the first DMRS is of the second type, and the first DMRS port number includes at least one of the port numbers 1000 and 1001, the first subcarrier is one RB and the numbers are 0, 1, 6, 7 A preset sub-carrier in the sub-carriers other than the other; further, in this case, the first sub-carrier is a sub-carrier numbered 2 in one RB.

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

Exemplarily, the demodulation reference signal DMRS port number associated with the second time-frequency resource set includes: a second DMRS port number, where the second DMRS port number corresponds to the first DMRS port corresponding to the DMRS demodulating the first codeword The numbers are different, and the first DMRS and the second DMRS are in different CDM groups.

In a special case, if at least two CDM groups are indicated in the first DCI, then the above-mentioned second time-frequency resource set does not exist, and there is no need to determine the second time-frequency resource set. This application is mainly considered One CDM group is indicated in the first DCI, and the first DMRS and the second DMRS are in different CDM groups.

Specifically, the second DMRS port number includes:

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

If the first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1002 and 1003, the second DMRS port number is 1000;

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, the second DMRS port number is 1004 or 1005;

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

In the above S110, the network device has determined the second time-frequency resource set corresponding to the first codeword (it can be understood as the time-frequency resource set mapped by the ZP PTRS of the first codeword), and also determines the preset time-frequency resource set For which time-frequency resource sets cannot map data, S120 needs to be performed to determine the first time-frequency resource set, which is used to map the first PTRS, and the first PTRS is used to demodulate the first data.

It should be understood that in this application, there is no restriction on how the network device in S120 determines the first time-frequency resource set, and it may be determined by using the method of determining the time-frequency resource set mapped by the PTRS corresponding to the codeword introduced in the prior art. Here No longer.

After determining the foregoing first time-frequency resource set and the second time-frequency resource set, the network device may send the foregoing first codeword to the terminal device, that is, perform S130 to send the first codeword. The remaining time-frequency resource set is used to map the first codeword, and the remaining time-frequency resource set is the time excluding the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set Frequency resource collection. That is to say, the first codeword is not mapped on the first time-frequency resource set and the second time-frequency resource set; in other words, the first codeword performs rate matching according to the first time-frequency resource set and the second time-frequency resource set.

In a possible implementation manner, if in S110 the network device determines that the flow of the second time-frequency resource set is determined by the network device itself, then the method flow shown in FIG. 4 also includes S121, the network device sends to the terminal device before performing S130 High layer signaling, which is used to indicate the second time-frequency resource set. That is, the terminal device can determine the second time-frequency resource set based on the received high-level signaling, and determine that it is not in the preset time based on the PTRS-mapped time-frequency resource set and the second time-frequency resource set corresponding to the received first codeword. Demodulate the first codeword on the first time-frequency resource set and the second time-frequency resource set in the 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 stipulated by the protocol, the method flow shown in FIG. 4 also includes S122 before performing S130. The terminal device determines the second time-frequency resource set based on the protocol predefined. Two time-frequency resource collections. 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 above, except that the execution subject is the terminal device, which will not be repeated here.

Exemplarily, in order for the terminal device to successfully parse the first codeword, the method flow for data transmission shown in FIG. 4 further includes: S123, the network device sends the first DCI to the terminal device, and the first DCI is used to schedule the first Data, where the first DCI is also used to indicate the aforementioned first DMRS port number.

In a possible implementation manner, the foregoing second time-frequency resource set may be a time-frequency resource set corresponding to the PTRS of other codewords except the first codeword. Hereinafter, this situation will be described in detail with reference to FIG. 5.

FIG. 5 is a schematic diagram of another method for data transmission provided by an embodiment of the present application. The schematic diagram includes S210-S220, and these steps are described in detail below.

S210. Determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and at least one second data, and the remaining time-frequency resource set is a preset time-frequency resource set A set of time-frequency resources other than the first set of time-frequency resources and the at least one second set of time-frequency resources, where the remaining set of time-frequency resources is the first DCI indicator for the first data and the second data, respectively The set of time-frequency resources and the set of time-frequency resources indicated by the second DCI.

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, at least one second time-frequency resource set is used to carry at least one second PTRS respectively, and the first PTRS is used for demodulation The first data and the at least one second PTRS are respectively used to demodulate at least one second data.

It should be understood that the aforementioned first data and at least one second data are not mapped on the first time-frequency resource set and at least one second time-frequency resource set; in other words, the first data is based on the first time-frequency resource set and at least one second time-frequency resource set. The time-frequency resource collection performs rate matching.

The first data and the second data use different transmission ports; in other words, the first data and the second data correspond to different DMRS ports; in other words, the first data and the second data are different codewords; or, the first data and the second data are different codewords; The data and the second data correspond to different TBs; in other words, the first data and the second data correspond to different transmission layers; in other words, the spatial filtering information of the first data and the second data are different; in other words, the first data The same carrier is occupied by the second data; in other words, the first data and the second data occupy the same BWP.

For ease of understanding, the first data and the second data will be referred to as the first codeword and the second codeword below, and the description will be made from the perspective of a second codeword, but it should be understood that this application is not limited to only one first codeword. Two code words.

Exemplarily, in order for the terminal device to successfully parse the first codeword and the second codeword, the method flow for data transmission shown in FIG. 5 further includes S211: the network device sends the first DCI and the second DCI to the terminal device, so The first DCI is used to indicate the preset time-frequency resource set and enable the first codeword, and the second DCI is used to indicate the preset time-frequency resource set that carries the second codeword and enable the The second code word. Or it can be understood that the first DCI is used to schedule the first codeword, and the second DCI is used to schedule the corresponding second codeword; or it can be understood that the first DCI is not used to schedule the second codeword, and the second DCI Not used for scheduling 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 first codeword and the second codeword The corresponding MCS and the indication information of whether to retransmit are respectively indicated by the first DCI and the second DCI.

Optionally, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the control resource sets corresponding to the first DCI and the second DCI are different; in other words, the physical downlinks corresponding to the first DCI and the second DCI The control channel configuration parameters are different; in other words, the demodulation reference signal DMRS ports indicated by the first DCI and the second DCI belong to different code division multiplexing CDM groups; in other words, the control resource set occupied by the first DCI and the second DCI occupy The control resource set of is located on the same carrier; in other words, the control resource set occupied by the first DCI and the control resource set occupied by the second DCI occupy the same BWP.

Specifically, when one DCI can only indicate the scheduling information corresponding to one codeword, only the codeword is enabled. When one DCI can indicate the scheduling information corresponding to two codewords, the DCI can be used to indicate whether to enable the two codewords. Codewords, where the enabling codeword indicates that the transmission block is sent using the modulation and coding method indicated by the indication information.

It should be understood that the "first" and "second" in this application are only used for distinguishing description, and do not constitute any limitation on the protection scope of this application. For example, the above-mentioned first codeword and second codeword are only for distinguishing different codewords, and do not constitute any limitation on the protection scope of the present application. For example, the network device determines a first time-frequency resource set and two second time-frequency resource sets (a second time-frequency resource set #1 and a second time-frequency resource set #2). Among them, the second time-frequency resource set #1 corresponds to the second codeword #1, and the second time-frequency resource set #2 corresponds to the second codeword #2. The first codeword 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 set, or the first codeword is based on the first The time-frequency resource set, the second time-frequency resource set #1, and the second time-frequency resource set #2 perform rate matching; the second codeword #1 is not in the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set. The second time-frequency resource set #1 and the second time-frequency resource set #2 are mapped, or the second codeword #1 is based on the first time-frequency resource set, the second time-frequency resource set #1, and the second time-frequency resource set #2 Perform rate matching; 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 set, or Say that 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.

Exemplarily, the first time-frequency resource set is used to map the first PTRS, the second time-frequency resource set corresponding to the second codeword is used to map the second PTRS, and the first PTRS is used to demodulate the first PTRS. A codeword, and the second PTRS is used to demodulate the second codeword. Specifically, the PTRS has been described in detail in the previous section and will not be repeated here.

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

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

In the embodiment of the present application, the network device may determine the first time-frequency resource set and the second time-frequency resource set according to pre-configuration information, where the pre-configuration information indicates the first time-frequency resource set and the second time-frequency resource set. At least one configuration parameter in the configuration parameters of the frequency resource set;

or,

The network device determines the first time-frequency resource set and the second time-frequency resource set and sends high-level signaling to the terminal device. The high-level signaling indicates at least one of the configuration parameters of the first time-frequency resource set and the second time-frequency resource set A configuration parameter;

or,

The network device adds a first field to the first DCI, where the first field is used to indicate at least one configuration parameter among the configuration parameters of the second time-frequency resource set; A second field is added to the DCI, and the second field is used to indicate at least one configuration parameter of the configuration parameters of the first time-frequency resource set.

Several methods for indicating the first time-frequency resource set based on pre-configuration information, high-level signaling, and the second field are respectively introduced below.

Manner 1: Determine the first time-frequency resource set according to pre-configuration information, where the pre-configuration information indicates a configuration parameter of the first time-frequency resource set, and the configuration parameter includes at least one of the following parameters :

Time domain start position, time domain density, frequency domain position, and frequency domain density.

Specifically, the pre-configuration information indicating the first time-frequency resource set can be understood as the first time-frequency resource set predefined by the protocol. That is, the terminal device and the network device can learn the location of the first time-frequency resource set according to the location of the first time-frequency resource set predefined by the protocol.

Therefore, when the network device transmits the second codeword, it can be based on the predefined position of the first time-frequency resource set and the second time-frequency resource set corresponding to the second codeword, thereby avoiding the preset time-frequency resource set Mapping a second codeword on the first time-frequency resource set and the second time-frequency resource set in;

In the same way, when the terminal device receives the second codeword, it can be based on the position of the predefined first time-frequency resource set and the second time-frequency resource set corresponding to the second codeword indicated by the second DCI, thereby avoiding Demodulate the second codeword on the first time-frequency resource set and the second time-frequency resource set in the preset time-frequency resource set.

Below, from the perspective of a network device, it is briefly explained how the network device determines the first time-frequency resource set according to the pre-configuration information.

Specifically, the pre-configuration information indicating the time domain start position of the first time-frequency resource set may be: the pre-configuration information indicates that the time domain start position of the first time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position. Furthermore, the network device can learn the time domain start position of the first time-frequency resource set according to the preset time-domain start position of the time-frequency resource set.

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

The time domain density of the first time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the first codeword and the first transmission capability value, where the MCS corresponding to the first codeword is indicated by the preconfiguration information , The first transmission capability value is used to determine the time domain density of the first PTRS; or,

The pre-configuration information directly indicates the time domain density of the first time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the first codeword and the first transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be When 2 is shown in Table 3, then looking up Table 3 can determine that the time domain density of the first time-frequency resource set is 4. That is, the manner in which the pre-configuration information in the present application indicates the time domain density of the first time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the time domain density of the first time-frequency resource set can be determined according to the MCS corresponding to the first codeword.

For another example, the pre-configuration information directly indicates that the time domain density of the first time-frequency resource set is 4. Wherein, the time domain density is N, which means 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 pre-configuration information indicates that the frequency domain density of the first time-frequency resource set includes:

The frequency domain density of the first time-frequency resource set is determined according to the number level of the resource block RB corresponding to the first codeword and the second transmission capability value, wherein the RB corresponding to the first codeword is a pre-configuration information indicator , The second transmission capability value is reported by the terminal device and used to determine the frequency domain density of the first PTRS; or,

The pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set.

For example, as shown in Table 4 involved in the set of time-frequency resources for configuring PTRS described above, if the number of RBs corresponding to the first codeword and the second transmission capability value N _RB reported by the terminal device are used, the RB number level is determined When it is 2 shown in Table 4, then looking up Table 4 can determine that the frequency domain density of the first time-frequency resource set is 4. That is, the manner in which the pre-configuration information in this application indicates the frequency domain density of the first time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. In this way, the frequency domain density of the first time-frequency resource set can be determined according to the number of RBs corresponding to the first codeword.

For another example, the pre-configuration information directly indicates that the frequency domain density of the first time-frequency resource set is 4. Wherein, the frequency domain density is M, which means that there is an RE occupied by the first time-frequency resource set in every M RBs in the frequency domain, and M is a positive integer.

Specifically, the pre-configuration information indicating the frequency domain position of the first time-frequency resource set includes:

The pre-configuration information indicates the subcarriers occupied by the first time-frequency resource set; or,

The pre-configuration information indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

Optionally, combining Table 6 to Table 8 describes in detail how the pre-configuration information indicates the frequency domain position of the first time-frequency resource set.

First, determine the second demodulation reference signal DMRS port number corresponding to the second codeword according to the second DCI.

Table 6 shows that the pre-configuration information indicates the frequency domain position of the first time-frequency resource set by indicating the number of subcarriers occupied by the first time-frequency resource set.

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

If the second DMRS is of the first type, and the second DMRS port number includes at least one of the port numbers 1002 and 1003, the first time-frequency resource set occupies the preset time-frequency resource set Any one of the even numbered subcarriers in each RB in each RB;

If the second DMRS is of the second type, and the second DMRS port number includes at least one of the port numbers 1000 and 1001, the first time-frequency resource set occupies the preset time-frequency resource set Any one of the sub-carriers except the sub-carriers numbered 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 the port numbers 1002, 1003, 1004, and 1005, the first time-frequency resource set occupies the preset Any one of the subcarriers numbered 0, 1, 6, 7 in each RB in the time-frequency resource set.

Among them, for the first type of DMRS, DMRS ports 1000, 1001, 1004, and 1005 occupy even-numbered subcarriers (subcarrier numbers are 0, 2, 4...10), and DMRS ports 1002, 1003, 1006, and 1007 occupy odd-numbered subcarriers. Carrier (corresponding sub-carrier numbers are 1, 3, 5...); for the second type of DMRS, the sub-carrier numbers occupied by DMRS ports 1000 and 1001 are 0, 1, 6, 7, and those occupied by DMRS ports 1002, 1003 The sub-carrier numbers are 2, 3, 8, and 9, and the sub-carrier numbers occupied by the DMRS ports 1004 and 1005 are 4, 5, 10, and 11.

Table 6 Frequency domain position of the first time-frequency resource set

or,

Specifically, each RB in the preset time-frequency resource set includes 12 subcarriers, numbered from 0 to 0-11 in order, and each subcarrier corresponds to a number. The sub-carrier numbering is the order from the sub-carrier with the highest frequency to the sub-carrier with the lowest frequency within 1 RB, or the sub-carrier number is the order from the sub-carrier with the lowest frequency to the sub-carrier with the highest frequency within 1 RB Numbering.

Table 7 shows that the pre-configuration information indicates the frequency domain position of the first time-frequency resource set by indicating the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

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, the DMRS port number associated with the first time-frequency resource set Is 1002, then the first time-frequency resource set occupies any one of the odd-numbered sub-carriers 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 the port numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, then The first time-frequency resource set occupies any one of the even-numbered sub-carriers 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 the port numbers 1000 and 1001, the DMRS port number associated with the first time-frequency resource set is 1004, then The first time-frequency resource set occupies any one of the sub-carriers in each RB in the preset time-frequency resource set except for the sub-carriers numbered 0, 1, 6, and 7

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

Table 7 Frequency domain position of the first time-frequency resource set

or,

Further, as shown in Table 8, the first time-frequency resource set occupies any one of the odd-numbered subcarriers in each RB in the preset time-frequency resource set including:

The first time-frequency resource set occupies the subcarrier numbered 1 in each RB in the preset time-frequency resource set;

The occupation of any one of the even-numbered subcarriers in each RB in the preset time-frequency resource set by the first time-frequency resource set includes:

The first time-frequency resource set occupies a subcarrier numbered 0 in each RB in the preset time-frequency resource set;

The first time-frequency resource set occupies any one of the subcarriers in each RB in the preset time-frequency resource set except for numbers 0, 1, 6, and 7, including:

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

The subcarriers numbered 0, 1, 6, and 7 in each RB in the preset time-frequency resource set occupied by the first time-frequency resource set include:

The first time-frequency resource set occupies a subcarrier numbered 0 in each RB in the preset time-frequency resource set.

Table 8 Frequency domain position of the first time-frequency resource set

The method is equivalent to that the protocol has predetermined various parameters of the first time-frequency resource set, and the terminal device can also determine the first time-frequency resource set based on the protocol. The specific determination method is similar to the above-mentioned network device determining the first time-frequency resource set. I won't repeat it here.

Manner 2: The network device sends high-level signaling to the terminal device, where the high-level signaling indicates a configuration parameter of the first time-frequency resource set, and the configuration parameter includes at least one of the following parameters:

Specifically, the high-layer signaling indicating the time domain start position of the first time-frequency resource set may be: the high-layer signaling indicates that the time domain start position of the first time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position. Furthermore, the network device can learn the time domain start position of the first time-frequency resource set according to the preset time-domain start position of the time-frequency resource set.

Specifically, the high-layer signaling indicating the time domain density of the first time-frequency resource set includes:

The time-domain density of the first time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the first codeword and the first transmission capability value, where the MCS corresponding to the first codeword is indicated by the high-level signaling , The first transmission capability value is used to determine the time domain density of the first PTRS; or,

The high-layer signaling directly indicates the time domain density of the first time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the first codeword and the first transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be At 2 o'clock, the time domain density of the first time-frequency resource set is 4. That is, the high-level signaling in this application indicates that the time-domain density of the first time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the time domain density of the first time-frequency resource set can be determined according to the MCS corresponding to the first codeword.

For another example, the high-level signaling directly indicates that the time domain density of the first time-frequency resource set is 4.

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

Specifically, the high-layer signaling indicating the frequency domain density of the first time-frequency resource set includes:

The frequency domain density of the first time-frequency resource set is determined according to the resource block RB quantity level and the second transmission capability value corresponding to the first codeword, wherein the RB corresponding to the first codeword is a high-level signaling indication , The second transmission capability value is reported by the terminal device and used to determine the frequency domain density of the first PTRS; or,

The high-layer signaling directly indicates the frequency domain density of the first time-frequency resource set.

For example, as shown in Table 4 involved in the set of time-frequency resources for configuring PTRS described above, if the number of RBs corresponding to the first codeword and the second transmission capability value N _RB reported by the terminal device are used, the RB number level is determined When it is 2, the frequency domain density of the first time-frequency resource set is 4. That is, the high-level signaling in this application indicates that the frequency domain density of the first time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. In this way, the frequency domain density of the first time-frequency resource set can be determined according to the number of RBs corresponding to the first codeword.

For another example, the high-layer signaling directly indicates that the frequency domain density of the first time-frequency resource set is 4.

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

Specifically, the high-layer signaling indicating the frequency domain position of the first time-frequency resource set includes:

The higher layer signaling indicates the subcarriers occupied by the first time-frequency resource set; or,

The high-layer signaling indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

Optionally, in combination with Table 6 to Table 8 shown in the foregoing, it is described in detail how high-level signaling indicates the frequency domain position of the first time-frequency resource set.

Table 6 shows that the high-level signaling indicates the frequency domain position of the first time-frequency resource set by indicating the number of subcarriers occupied by the first time-frequency resource set.

Table 7 shows that the high-level signaling indicates the frequency domain position of the first time-frequency resource set by indicating the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

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 will not be repeated here.

The second method is equivalent to that the network device first determines the various parameters of the first time-frequency resource set, and informs the terminal device of the various parameters of the first time-frequency resource set through high-level signaling before sending the codeword, then the terminal device can be based on The high-layer signaling determines the first time-frequency resource set, and the specific determination method is how the above-described high-layer signaling indicates various parameters of the first time-frequency resource set, which will not be repeated here.

Manner 3: The second DCI sent by the network device to the terminal device includes a second field, where the second field is used to indicate the configuration parameter of the first time-frequency resource set, where the configuration parameter includes at least the following parameters one of:

Specifically, the second field indicating the time domain start position of the first time-frequency resource set may be: the second field indicates that the time domain start position of the first time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position.

Specifically, the second field indicating the time domain density of the first time-frequency resource set includes:

The time domain density of the first time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the first codeword and the first transmission capability value, wherein the MCS corresponding to the first codeword is indicated by the second field , The first transmission capability value is used to determine 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 the MCS level corresponding to the second codeword. One MCS field (second field) is used to indicate the MCS level corresponding to the first codeword.

Or, the second field directly indicates the time domain density of the first time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the first codeword and the first transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be At 2 o'clock, the time domain density of the first time-frequency resource set is 4. That is, the second field in the present application indicates that the time domain density of the first time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the time domain density of the first time-frequency resource set can be determined according to the MCS corresponding to the first codeword.

For another 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 time-frequency resource set is 4. As shown in Table 9.

The second field of Table 9 indicates the time domain density

It should be understood that Table 9 is only an example, and there may be other possible correspondences between the second field and the time-domain density of the first time-frequency resource set, which will not be illustrated one by one here. For example, the second field may be composed of 3 bits.

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

The time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively completely overlap;

The time domain resources and/or frequency domain resources respectively occupied by the first codeword and the second codeword partially overlap;

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

The first code word and the second code word use different transmission ports; in other words, the first code word and the second code word correspond to different DMRS ports; in other words, the first code word and the second code word are different code words ; In other words, the first code word and the second code word correspond to different TBs; in other words, the first code word and the second code word correspond to different transmission layers; or, the first code word and the second code word The spatial filtering information is different; in other words, the first codeword and the second codeword occupy the same carrier; in other words, 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, and 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 to schedule the second codeword, and the second DCI is not used to schedule the first codeword;

Optionally, the first DCI is only used to schedule the first codeword, and the first DCI is only used to schedule the second codeword.

Further, the position relationship is used to determine 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 codeword and the second codeword respectively completely overlap, 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 based on the frequency domain in the second DCI Resource indication information is determined;

If the time domain resources and/or frequency domain resources respectively occupied by the first codeword and the second codeword partially overlap, the frequency domain density of the first time-frequency resource set is equal to X, and the X is based on the second The field is determined or determined according to the high-level configuration parameters, and the value of X is 2 or 4; or,

The second field directly indicates the frequency domain density of the first time-frequency resource set.

Exemplarily, the second field occupies two bits, and the second field is used to indicate the frequency domain density of the first time-frequency resource set including:

When the second field is "00", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively completely overlap, and the frequency domain density of the first time-frequency resource set is the same as the second time-frequency resource set The frequency domain density of is equal; or,

When the first field is "01", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively do not overlap at all, and the frequency domain density of the first time-frequency resource set is any value; or,

When the first field is "10", the time domain resources and/or frequency domain resources respectively occupied by the first codeword and the second codeword partially overlap, and the frequency domain density of the first time-frequency resource set is 4; or,

When the first field is "11", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively partially overlap, and the frequency domain density of the first time-frequency resource set is 2. As shown in Table 10 and Table 11.

The second field of Table 10 indicates the frequency domain density

Table 11 Field description of the second field

Table 12 Field description of the second field

It should be understood that Table 10 is just an example, and there may be other possible correspondences between the second field and the frequency domain density of the first time-frequency resource set, which will not be described here. For example, the second field may be composed of 3 bits.

The second field indicates the subcarrier occupied by the first time-frequency resource set; or,

The second field indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

Optionally, it is described in detail how the second field indicates the frequency domain position of the first time-frequency resource set in combination with Table 6 to Table 8 shown above.

Table 6 shows that the second field indicates the frequency domain position of the first time-frequency resource set by indicating the number of the subcarrier occupied by the first time-frequency resource set.

Table 7 shows that the second field indicates the frequency domain position of the first time-frequency resource set by indicating the demodulation reference signal DMRS port number associated with the first time-frequency resource set.

It should also be understood that the second field may only indicate a part of the configuration parameters among the four configuration parameters of the first time-frequency resource set, and other configuration parameters may be determined in combination with the above-mentioned method 1 and method 2.

For example, the second field included in the second DCI only indicates the frequency domain density of the first time-frequency resource set (as shown in Table 10 and Table 11). Then, the time-domain starting position, time-domain density, and frequency-domain position of the first time-frequency resource set can be determined based on the above-mentioned method one or two; or, the time-domain starting position and time-domain position of the first time-frequency resource set The density and frequency domain position may be determined by multiplexing the existing fields in the second DCI (the MCS field in the second DCI, the DMRS port indication field, etc., as described above).

It should also be understood that the foregoing manner 1, manner 2, and manner 3 determine the time domain starting position, time domain density, frequency domain position, and frequency domain density of at least one configuration parameter of the first time-frequency resource set. Methods can be used in combination.

For example, the time-domain start position, time-domain density, and frequency-domain position of the first time-frequency resource set are determined based on the manner shown in the first manner, and the frequency-domain density of the first time-frequency resource set is determined based on the manner shown in the third manner. For another example, determine the time-domain start position, time-domain density, and frequency-domain position of the first time-frequency resource set based on the method shown in the second method, and determine the frequency-domain density of the first time-frequency resource set based on the method shown in the third method . There can be multiple combinations, so I won’t repeat them here.

The foregoing manners 1 to 3 describe in detail how to determine the time domain starting position, time domain density, frequency domain position, and frequency domain density of the first time-frequency resource set. Compared with the aforementioned situation where the terminal device needs to correctly parse the DCI corresponding to multiple codewords before it can correctly parse the codewords, the method for data transmission in the embodiments of the present application is pre-defined by the protocol and high-level The signaling indication or the second field indicates the configuration information of the first time-frequency resource set, so that the terminal device can parse the second time-frequency resource set mapped to 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 protocol predefinition, high-level signaling indication or the second field, so as to avoid the first time-frequency resource set in the preset time-frequency resource set And parse the second codeword on the second time-frequency resource set.

It should be understood that the manners 1 to 3 are described by taking one second codeword as an example, and the situation for multiple second codewords (second codeword #1-second codeword #X) is similar to the above. That is, for the second codeword #1, the network device and the terminal device can indicate at least one second time-frequency resource set (second time-frequency resource set #2-second time Frequency resource set #X) and configuration information of the first time-frequency resource set.

It is similar to the determination of the time domain starting position, time domain density, frequency domain position and frequency domain density of the first time-frequency resource set described above. For the first codeword, it is necessary to avoid mapping on the first time-frequency resource set and the at least one second time-frequency resource set in the preset time-frequency resource set. That is, under the premise that the first DCI indicates that the first time-frequency resource set is used for mapping the first PTRS, it is also necessary to indicate the location of at least one second time-frequency resource set.

Several methods for indicating the second time-frequency resource set based on pre-configuration information, high-level signaling, and the first field are respectively introduced below.

Manner 1: Determine the second time-frequency resource set according to pre-configuration information, where the pre-configuration information indicates a configuration parameter of the second time-frequency resource set, and the configuration parameter includes at least one of the following parameters :

Specifically, the pre-configuration information indicating the second time-frequency resource set can be understood as the second time-frequency resource set predefined by the protocol. That is, the terminal device and the network device can learn the location of the second time-frequency resource set according to the location of the second time-frequency resource set predefined by the protocol.

Therefore, when the network device transmits the first codeword, it can be based on the position of at least one predefined second time-frequency resource set and the first time-frequency resource set, thereby avoiding the first in the preset time-frequency resource set. Mapping the first codeword on the set of time-frequency resources and the at least one second set of time-frequency resources;

In the same way, when the terminal device receives the first codeword, it can avoid the preset time-frequency resource set based on the position of at least one predefined second time-frequency resource set and the first time-frequency resource set indicated by the first DCI. Demodulate the first codeword on the first set of time-frequency resources and the at least one second set of time-frequency resources in.

Below, from the perspective of the network device, it is briefly explained how the network device determines the second time-frequency resource set according to the pre-configuration information.

Specifically, the pre-configuration information indicating the time domain start position of the second time-frequency resource set may be: the pre-configuration information indicates that the time domain start position of the second time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position. Furthermore, the network device can learn the time domain start position of the second time-frequency resource set according to the preset time-domain start position of the time-frequency resource set.

Specifically, the pre-configuration information indicates that the time domain density of the second time-frequency resource set includes:

The time domain density of the second time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the second codeword and the third transmission capability value, where the MCS corresponding to the second codeword is indicated by the preconfiguration information , The third transmission capability value is used to determine the time domain density of the first PTRS; or,

The pre-configuration information directly indicates the time domain density of the second time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the second codeword and the third transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be When 2 is shown in Table 3, then looking up Table 3 can determine that the time domain density of the second time-frequency resource set is 4. That is, the manner in which the pre-configuration information in the present application indicates the time-domain density of the second time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the time domain density of the second time-frequency resource set can be determined according to the MCS corresponding to the second codeword.

For another example, the pre-configuration information directly indicates that the time domain density of the second time-frequency resource set is 4. Wherein, the time domain density is N, which means 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 pre-configuration information indicates that the frequency domain density of the second time-frequency resource set includes:

The frequency domain density of the second time-frequency resource set is determined according to the number level of the resource block RB corresponding to the second codeword and the fourth transmission capability value, where the RB corresponding to the second codeword is a pre-configuration information indicator , The fourth transmission capability value is reported by the terminal device and used to determine the frequency domain density of the first PTRS; or,

The pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set.

For example, as shown in Table 4 involved in the set of time-frequency resources for configuring PTRS introduced above, if the number of RBs is determined based on the number of RBs corresponding to the second codeword and the fourth transmission capability value N _RB reported by the terminal device When it is 2 shown in Table 4, then looking up 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 pre-configuration information in this application indicates the frequency domain density of the second time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. In this way, the frequency domain density of the second time-frequency resource set can be determined according to the number of RBs corresponding to the second codeword.

For another example, the pre-configuration information directly indicates that the frequency domain density of the second time-frequency resource set is 4. Wherein, the frequency domain density is M, which means that there is an RE occupied by the second time-frequency resource set in every M RBs in the frequency domain, and M is a positive integer.

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

The pre-configuration information indicates the subcarriers occupied by the second time-frequency resource set; or,

The pre-configuration information indicates the demodulation reference signal DMRS port number associated with the second time-frequency resource set.

Optionally, combining Table 13 to Table 15 introduces in detail how the pre-configuration information indicates the frequency domain position of the second time-frequency resource set.

First, determine the first demodulation reference signal DMRS port number corresponding to the first codeword according to the first DCI.

Table 13 shows that the pre-configuration information 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.

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 the port numbers 1000 and 1001, the second time-frequency resource set occupies the preset time Any one of the odd-numbered subcarriers in each RB in the frequency resource set, where the first DMRS is used to demodulate the first codeword;

If the first DMRS is of the first type, and the first DMRS port number includes at least one of the port numbers 1002 and 1003, the second time-frequency resource set occupies the preset time-frequency resource set Any one of the even numbered subcarriers in each RB 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 1000 and 1001, the second time-frequency resource set occupies the preset time-frequency resource set Any one of the sub-carriers except the sub-carriers numbered 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 the port numbers 1002, 1003, 1004, and 1005, the second time-frequency resource set occupies the preset Any one of the subcarriers numbered 0, 1, 6, 7 in each RB in the time-frequency resource set.

Table 13 Frequency domain position of the second time-frequency resource set

or,

Table 14 shows that the pre-configuration information indicates the frequency domain position of the second time-frequency resource set by indicating the demodulation reference signal DMRS port number associated with the second time-frequency resource set.

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, the DMRS port number associated with the second time-frequency resource set Is 1002, the second time-frequency resource set occupies any one of the odd-numbered sub-carriers 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 the port numbers 1002 and 1003, the DMRS port number associated with the second time-frequency resource set is 1000, then The second time-frequency resource set occupies any one of the even-numbered subcarriers 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 the port numbers 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1004, then The second time-frequency resource set occupies any one of the subcarriers in each RB in the preset time-frequency resource set except for the subcarriers numbered 0, 1, 6, and 7

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

Table 14 Frequency domain position of the second time-frequency resource set

or,

Further, as shown in Table 15, the second time-frequency resource set occupying any one of the odd-numbered sub-carriers in each RB in the preset time-frequency resource set includes:

The second time-frequency resource set occupies the subcarrier numbered 1 in each RB in the preset time-frequency resource set;

The second time-frequency resource set occupies any one of the even-numbered sub-carriers in each RB in the preset time-frequency resource set including:

The second time-frequency resource set occupies a subcarrier numbered 0 in each RB in the preset time-frequency resource set;

The second time-frequency resource set occupies any one of the subcarriers in each RB in the preset time-frequency resource set except for numbers 0, 1, 6, and 7, including:

The second time-frequency resource set occupies the subcarrier numbered 2 in each RB in the preset time-frequency resource set;

The subcarriers numbered any one of 0, 1, 6, and 7 in each RB in the preset time-frequency resource set occupied by the second time-frequency resource set include:

The second time-frequency resource set occupies a subcarrier numbered 0 in each RB in the preset time-frequency resource set.

Table 15 Frequency domain position of the second time-frequency resource set

The first method is equivalent to that the protocol has predetermined various parameters of the second time-frequency resource set, and the terminal device can also determine the second time-frequency resource set based on the protocol. The specific determination method is similar to the above-mentioned network device determining the second time-frequency resource set. I won't repeat it here.

Manner 2: The network device sends high-level signaling to the terminal device, where the high-level signaling indicates a configuration parameter of the second time-frequency resource set, and the configuration parameter includes at least one of the following parameters:

Specifically, the high-layer signaling indicating the time domain start position of the second time-frequency resource set may be: the high-layer signaling indicates that the time domain start position of the second time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position. Furthermore, the network device can learn the time domain start position of the second time-frequency resource set according to the preset time-domain start position of the time-frequency resource set.

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

The time domain density of the second time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the second codeword and the third transmission capability value, where the MCS corresponding to the second codeword is indicated by the high-level signaling , The third transmission capability value is used to determine the time domain density of the first PTRS; or,

The high-layer signaling directly indicates the time domain density of the second time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the second codeword and the third transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be At 2 o'clock, the time domain density of the second time-frequency resource set is 4. That is, the high-level signaling in this application indicates that the time-domain density of the second time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the time domain density of the second time-frequency resource set can be determined according to the MCS corresponding to the second codeword.

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

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

The frequency domain density of the second time-frequency resource set is determined according to the resource block RB quantity level and the fourth transmission capability value corresponding to the second codeword, where the RB corresponding to the second codeword is a high-level signaling indication , The fourth transmission capability value is reported by the terminal device and used to determine the frequency domain density of the first PTRS; or,

The high-layer signaling directly indicates the frequency domain density of the second time-frequency resource set.

For example, as shown in Table 4 involved in the set of time-frequency resources for configuring PTRS introduced above, if the number of RBs is determined based on the number of RBs corresponding to the second codeword and the fourth transmission capability value N _RB reported by the terminal device When it is 2, the frequency domain density of the second time-frequency resource set is 4. That is, the high-level signaling in the present application indicates that the frequency domain density of the second time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain described above. In this way, the frequency domain density of the second time-frequency resource set can be determined according to the number of RBs corresponding to the second codeword.

For another example, high-layer signaling directly indicates that the frequency domain density of the second time-frequency resource set is 4.

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

The higher layer signaling indicates the subcarriers occupied by the second time-frequency resource set; or,

The high-layer signaling indicates the demodulation reference signal DMRS port number associated with the second time-frequency resource set.

Optionally, in conjunction with Table 13 to Table 15 shown in the foregoing, it is described in detail how high-level signaling indicates the frequency domain position of the second time-frequency resource set.

First, determine the DMRS port number of the second demodulation reference signal corresponding to the first codeword according to the first DCI.

Table 13 shows that the high-level 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.

Table 14 shows that the high-layer signaling indicates the frequency domain position of the second time-frequency resource set by indicating the demodulation reference signal 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 and will not be repeated here.

The second method is equivalent to that the network device first determines the various parameters of the second time-frequency resource set, and informs the terminal device of the various parameters of the second time-frequency resource set through high-level signaling before sending the codeword, then the terminal device can be based on The high-level signaling determines the second time-frequency resource set, and the specific determination method is how the above-described high-level signaling indicates various parameters of the second time-frequency resource set, which will not be repeated here.

Manner 3: The first DCI sent by the network device to the terminal device includes a first field, and the first field is used to indicate configuration parameters of the second time-frequency resource set, where the configuration parameters include at least the following parameters one of:

Specifically, the first field indicating the time domain start position of the second time-frequency resource set may be: the first field indicates that the time domain start position of the second time-frequency resource set is the time domain start position of the preset time-frequency resource set Start position.

Specifically, the first field indicating the time domain density of the second time-frequency resource set includes:

The time domain density of the second time-frequency resource set is determined according to the modulation and coding scheme MCS corresponding to the second codeword and the third transmission capability value, where the MCS corresponding to the second codeword is indicated by the first field , The third transmission capability value is used to determine 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 the MCS level corresponding to the second codeword, and the other One MCS field (first field) is used to indicate the MCS level corresponding to the second codeword.

Or, the first field directly indicates the time domain density of the second time-frequency resource set.

For example, as shown in Table 3 involved in the time-frequency resource set for configuring PTRS described above, if based on the MCS corresponding to the second codeword and the third transmission capability value ptrs-MCS reported by the terminal device, the MCS level is determined to be At 2 o'clock, the time domain density of the second time-frequency resource set is 4. That is, the first field in this application indicates that the time domain density of the second time-frequency resource set may be similar to the manner in which the PTRS is mapped to the physical resources in the time-frequency domain as described above. In this way, the time domain density of the second time-frequency resource set can be determined according to the MCS corresponding to the second codeword.

For another example, the first 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 second time-frequency resource set is 4. As shown in Table 16.

The first field of Table 16 indicates the time domain density

It should be understood that Table 16 is only an example, and there may be other possible correspondences between the first field and the time domain density of the second time-frequency resource set, which will not be described here. For example, the first field may be composed of 3 bits.

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

Further, the position relationship is used to determine the frequency domain density of the second time-frequency resource set:

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

If the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is based on the first The field is determined or determined according to the high-level configuration parameters, and the value of Y is 2 or 4;

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

Exemplarily, the first field occupies two bits, and the first field is used to indicate the frequency domain density of the second time-frequency resource set including:

When the first field is "00", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively completely overlap, and the frequency domain density of the second time-frequency resource set is the same as the first time-frequency resource set The frequency domain density of is equal; or,

When the first field is "01", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively do not overlap at all, and the frequency domain density of the second time-frequency resource set is any value; or,

When the first field is "10", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively partially overlap, and the frequency domain density of the second time-frequency resource set is 4; or,

When the first field is "11", the time domain resources and/or frequency domain resources occupied by the first codeword and the second codeword respectively partially overlap, and the frequency domain density of the second time-frequency resource set is 2. As shown in Table 17 and Table 18.

The first field of Table 17 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 Table 17 is only an example, and there may be other possible correspondences between the frequency domain density of the first field and the second time-frequency resource set, which will not be described here. For example, the first field may be composed of 3 bits.

The first field indicates the subcarrier occupied by the second time-frequency resource set; or,

The first field indicates the demodulation reference signal DMRS port number associated with the second time-frequency resource set.

Optionally, it is described in detail how the first field indicates the frequency domain position of the second time-frequency resource set in conjunction with Table 13 to Table 15 shown above.

Table 13 shows that the first field 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.

Table 13 shows that the first field indicates the frequency domain position of the second time-frequency resource set by indicating the demodulation reference signal DMRS port number associated with the second time-frequency resource set.

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 DMRS port number associated with the second time-frequency resource set Is 1002, the second time-frequency resource set occupies any one of the odd-numbered sub-carriers in each RB in the preset time-frequency resource set;

Further, the second time-frequency resource set occupies one sub-carrier in each RB in the preset time-frequency resource set as shown in Table 14 and will not be repeated here.

It should also be understood that the first field may only indicate a part of the configuration parameters among the four configuration parameters of the second time-frequency resource set, and other configuration parameters may be determined in combination with the above-mentioned method 1 and method 2.

For example, the first field included in the first DCI only indicates the frequency domain density of the second time-frequency resource set (as shown in Table 10 and Table 11). Then, the time-domain start position, time-domain density, and frequency-domain position of the second time-frequency resource set can be determined based on the above-mentioned method one or two; or, the time-domain start position and time-domain position of the second time-frequency resource set The density and frequency domain position may be determined by multiplexing existing fields in the first DCI (the MCS field in the first DCI, the DMRS port indication field, etc., as described above).

It should also be understood that the foregoing manner 1, manner 2, and manner three determine the time domain starting position, time domain density, frequency domain position, and frequency domain density of at least one of the four configuration parameters of the second time-frequency resource set. Methods can be used in combination.

For example, the time-domain start position, time-domain density, and 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 another example, determine the time-domain start position, time-domain density, and frequency-domain position of the second time-frequency resource set based on the method shown in the second method, and determine the frequency-domain density of the second time-frequency resource set based on the method shown in the third method . There can be multiple combinations, so I won’t repeat them here.

The foregoing manners 1 to 3 describe in detail how to determine the time domain starting position, time domain density, frequency domain position, and frequency domain density of the second time-frequency resource set. Compared with the aforementioned situation where the terminal device needs to correctly parse the DCI corresponding to multiple codewords before it can correctly parse the codewords, the method for data transmission in the embodiments of the present application is pre-defined by the protocol and high-level The signaling indication or the first field indicates the configuration information of the second time-frequency resource set, so that the terminal device can parse the second time-frequency resource set mapped to the first PTRS based on the first DCI when receiving the first codeword, and Determine the second time-frequency resource set based on the configuration information of the second time-frequency resource set indicated by the protocol pre-defined, high-level signaling indication or the first field, so as to avoid the first time-frequency resource set in the preset time-frequency resource set And parse the first codeword on the second time-frequency resource set.

It should be understood that the manners 1 to 3 are described by taking one second codeword as an example, and the situation for multiple second codewords (second codeword #1-second codeword #X) is similar to the above. That is, for the first codeword, the network device and the terminal device can indicate at least one second time-frequency resource set (second time-frequency resource set #1-second time-frequency resource Set #X) configuration information.

After determining the first time-frequency resource set and at least one second time-frequency resource set, it is possible to determine the first time-frequency resource set and at least one second time-frequency resource set in which the first codeword is not in the preset time-frequency resource set Above mapping, the second codeword is not mapped on the first time-frequency resource set and at least one second time-frequency resource set in the preset time-frequency resource set, and the second codeword is any one of the at least one second codeword The second codeword and the second time-frequency resource set are at least one second time-frequency resource set for mapping the second PTRS corresponding to the second codeword. Furthermore, in step S220, the network device sends the first codeword and at least one second codeword to the terminal device.

In the following, taking the first code word and a second code word received by the terminal device as an example, how the terminal device parses the first code word and the second code word is explained.

Based on the above S210 can be known. When receiving the first codeword, the terminal device can determine the first time-frequency resource set mapped by the first PTRS based on the first DCI, and then can determine not to parse the first codeword on the first time-frequency resource set. Further, the position of the second time-frequency resource set is determined based on the first field in the first DCI, pre-defined by the protocol, received high-level signaling sent by the network device. And avoid parsing the first codeword on the second time-frequency resource set.

Similarly, when the terminal device receives the second codeword, it can determine the second time-frequency resource set mapped by the second PTRS based on the second DCI, and then can determine not to parse the second codeword on the second time-frequency resource set. Further, the location of the first time-frequency resource set is determined based on the second field in the second DCI, pre-defined by the protocol, received high-level signaling sent by the network device. And avoid parsing the second codeword on the first time-frequency resource set.

It should be understood that the specific manner for the terminal device to determine the first time-frequency resource set and the second time-frequency resource set based on the protocol predefinition is similar to the network device determining the first time-frequency resource set and the second time-frequency resource set shown in S210. I won't repeat it here.

Therefore, when the terminal device in the embodiment of the present application receives multiple codewords and the DCI corresponding to the multiple codewords, it is not necessary to analyze the multiple DCIs to determine the time-frequency resource set for codeword mapping. Improved code word reception performance.

The method for data transmission provided by the embodiment of the present application is described in detail above in conjunction with FIG. 4 and FIG. 5. The following describes how to apply the method for data transmission provided in the embodiments of the present application in conjunction with specific embodiments.

FIG. 6 is a schematic diagram of specific embodiment one provided by the embodiments of the present application. The schematic diagram includes TRP#1, TRP#2, and terminal equipment supporting CoMP.

Assume that two TRPs (TRP#1 and TRP#2 as shown in Figure 5) respectively schedule two PDSCHs (PDSCH#1 and PDSCH#2 as shown in Figure 5) occupy the same set of time-frequency resources. Inside, two PDSCHs use different DMRS groups to ensure that the DMRS frequency domain is orthogonal.

For TRP#1, PDSCH#1 does not map data on the first time-frequency resource set occupied by PTRS#1 sent by TRP#1. To avoid the interference of PTRS#2 sent by TRP#2, TRP#1 will also Determine a second second time-frequency resource set, where the second time-frequency resource set includes the time-frequency resource set occupied by PTRS#2 sent by PTRS#2. Further, PDSCH#1 does not map data on the second time-frequency resource set.

For TRP#2, PDSCH#2 does not map data on the second time-frequency resource set occupied by PTRS#2 sent by TRP#2. To avoid the interference of PTRS#1 sent by TRP#1, TRP#2 will also A first time-frequency resource set is configured, and the first time-frequency resource set includes the time-frequency resource set occupied by PTRS#1 sent by TRP#1. Further, PDSCH#2 does not map data on the first time-frequency resource set.

S310: TRP#1 determines a second time-frequency resource set.

Exemplarily, TRP#1 determines the second time-frequency resource set based on the above method 1. That is, the agreement specifies the time domain starting position, time domain density, frequency domain position, and frequency domain density of the second time-frequency resource set.

S320: The terminal device determines a second time-frequency resource set.

Exemplarily, the terminal device also determines the second time-frequency resource set based on the above method 1.

S330: TRP#1 sends the first codeword to the terminal device in PDSCH#1.

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

S340: The terminal device demodulates the first codeword.

Specifically, when the terminal device receives DCI#1, it learns the location of the first time-frequency resource set based on the location of the second time-frequency resource set specified by the protocol. The terminal device determines that the first codeword is demodulated on the first time-frequency resource set and the second time-frequency resource set that are not in PDSCH#1.

S350: TRP#2 determines the first time-frequency resource set.

Exemplarily, TRP#2 determines the first time-frequency resource set. That is, the agreement specifies the time domain starting position, time domain density, frequency domain position, and frequency domain density of the first time-frequency resource set.

S360: The terminal device determines a first time-frequency resource set.

Exemplarily, the terminal device determines the first time-frequency resource set based on the above method 1.

S370: TRP#2 sends the second codeword to the terminal device in PDSCH#2.

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

S380: The terminal device demodulates the second codeword.

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

It should be understood that FIG. 6 is only an example and cannot limit the protection scope of the present application.

It should be understood that in the foregoing method embodiments, the size of the sequence numbers of the foregoing processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not correspond to the implementation process of the embodiments of this application. Constitute any limitation.

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

Refer to FIG. 7, which is a schematic diagram of the device 10 for data transmission proposed in this application. As shown in FIG. 7, the device 10 includes a receiving unit 110 and a processing unit 120.

The processing unit 120 is configured to determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and the at least one second data, and the remaining time-frequency resource set Dividing the first time-frequency resource set and the at least one second time-frequency resource set from the preset time-frequency resource set,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used to Demodulate the first data, and the at least one second PTRS is used to demodulate at least one second data;

The receiving unit 110 is configured to receive the first data and the at least one second data.

The device 10 is completely corresponding to the terminal device in the method embodiment, and the device 10 may be the terminal device in the method embodiment, or a chip or functional module inside the terminal device in the method embodiment. The corresponding units of the apparatus 10 are used to execute the corresponding steps executed by the terminal device in the method embodiments shown in FIGS. 4-6.

Wherein, the receiving unit 110 in the apparatus 10 executes the steps of the terminal device receiving in the method embodiment. For example, perform step 123 of the receiving network device sending the first DCI to the terminal device and step 130 of the network device sending the first codeword to the terminal device in FIG. 4, and perform the receiving network device sending the first DCI to the terminal device in FIG. 5 And step 211 of at least one second DCI and step 220 of receiving the first codeword and at least one second codeword from the network device to the terminal device. The processing unit 120 executes the steps implemented or processed inside the terminal device in the method embodiment. For example, step 122 of determining a first time-frequency resource set in FIG. 4 and step 212 of determining a first time-frequency resource set and at least one second time-frequency resource set in FIG. 5 are performed.

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

Referring to FIG. 8, FIG. 8 is a schematic structural diagram of a terminal device 20 applicable to an embodiment of the present application. The terminal device 20 can be applied to the system shown in FIG. 1. For ease of description, FIG. 8 only shows the 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 and output device. The processor is used to control the antenna and the input and output devices to send and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory to execute the terminal device in the method for data transmission proposed in this application. Corresponding process and/or operation. I won't repeat them here.

Those skilled in the art can understand that, for ease of description, FIG. 8 only shows a memory and a processor. In actual terminal devices, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.

Refer to FIG. 9, which is a schematic diagram of the device 30 for data transmission proposed in this application. As shown in FIG. 9, the device 30 includes a sending unit 310 and a processing unit 320.

The processing unit 320 is configured to determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and at least one second data, and the remaining time-frequency resource set is a preset Suppose a set 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 the set of time-frequency resources,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used to demodulate the First data, the at least one second PTRS is used to demodulate at least one second data;

The sending unit 310 is configured to send the first data and the at least one second data.

The apparatus 30 completely corresponds to the network equipment in the method embodiment, and the apparatus 30 may be the network equipment in the method embodiment, or a chip or functional module inside the network equipment in the method embodiment. The corresponding units of the device 30 are used to execute the corresponding steps executed by the network device in the method embodiments shown in FIGS. 4-6.

Wherein, the sending unit 310 in the apparatus 30 executes the steps of the network device sending in the method embodiment. For example, perform step 123 of sending the first DCI to the terminal device and step 130 of sending the first codeword to the terminal device in FIG. 4, and perform step 211 of sending the first DCI and at least one second DCI to the terminal device in FIG. 5 And the step 220 of sending the first codeword and at least one second codeword to the terminal device. The processing unit 320 executes the steps implemented or processed inside the network device in the method embodiment. For example, perform step 110 of determining the first time-frequency resource set and step 120 of determining the second time-frequency resource set in FIG. 4, and perform the step of determining the first time-frequency resource set and at least one second time-frequency resource set in FIG. Step 210.

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 sending unit 310 may constitute a transceiver unit, and have both receiving and sending 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 can be integrated to form a transceiver.

Referring to FIG. 10, FIG. 10 is a schematic structural diagram of a network device 40 applicable to an embodiment of the present application, which can be used to implement the functions of the network device in the above-mentioned method for data transmission. For example, it can be a schematic diagram of the structure of the base station. As shown in Figure 10, the network device can be applied to the system shown in Figure 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 base band units (BBU). The baseband unit may also be referred to as a digital unit (DU) 402. The RRU 401 may be called a transceiver unit, and corresponds to the sending unit 310 in FIG. 9. Optionally, the transceiver unit 401 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 4011 and a radio frequency unit 4012. Optionally, the transceiving unit 401 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 401 part is mainly used for receiving and sending of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending the control information described in the foregoing embodiments to the terminal device. The part 402 of the BBU is mainly used for baseband processing and control of the base station. The RRU 401 and the BBU 402 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 402 is the control center of the network equipment, and may also be called a processing unit, which may correspond to the processing unit 320 in FIG. 9 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing unit) 402 can be used to control the network device 40 to execute the operation procedure of the network device in the foregoing 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 composed of one or more single boards, and multiple single boards may jointly support a radio access network of a single access standard (for example, an LTE system, or a 5G system), or may separately support Wireless access networks of different access standards. 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 in the above-mentioned embodiment, etc. The processor 4022 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment. The memory 4021 and the processor 4022 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, each board can be equipped with necessary circuits.

It should be understood that the network device 40 shown in FIG. 10 can implement the network device functions involved in the method embodiments of FIGS. 4-6. The operations and/or functions of each unit in the network device 40 are respectively for implementing the corresponding process executed by the network device in the method embodiment of the present application. To avoid repetition, detailed description is omitted here. The structure of the network device illustrated in FIG. 10 is only a possible form, and should not constitute any limitation in the embodiment of the present application. This application does not exclude the possibility of other network device structures that may appear in the future.

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

The present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium. When the instructions run on a computer, the computer executes the network device in the method shown in FIGS. 4-6. The various steps performed.

The present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium. When the instructions run on a computer, the computer executes the above-mentioned method shown in FIG. 4 to FIG. 6. The various steps performed.

This application also provides a computer program product containing instructions. When the computer program product runs on a computer, the computer executes the steps performed by the network device in the method shown in FIGS. 4-6.

This application also provides a computer program product containing instructions. When the computer program product runs on a computer, the computer executes the steps performed by the terminal device in the method shown in FIGS. 4-6.

This application also provides a chip including a processor. The processor is used to read and run the computer program stored in the memory to execute the corresponding operation and/or process executed by the terminal device in the method for data transmission provided in this application. Optionally, the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive data and/or information that needs to be processed, and the processor obtains the data and/or information from the communication interface, and processes the data and/or information. The communication interface can be an input and output interface.

This application also provides a chip including a processor. The processor is used to call and run the computer program stored in the memory to execute the corresponding operation and/or process executed by the network device in the method for data transmission provided in this application. Optionally, the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive data and/or information that needs to be processed, and the processor obtains the data and/or information from the communication interface, and processes the data and/or information. The communication interface can be an input and output interface.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

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

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method for data transmission, characterized in that it comprises:

Determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and at least one second data, and the remaining time-frequency resource set is a preset time-frequency resource set A set of time-frequency resources other than the first set of time-frequency resources and the at least one second set of time-frequency resources,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used for demodulation The first data and the at least one second PTRS are respectively used to demodulate the at least one second data;

Sending the first data and the at least one second data.
The method of claim 1, wherein the method further comprises:

Send the first downlink control information DCI and at least one second DCI, where 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.
The method according to claim 2, wherein the determining the first time-frequency resource set and the second time-frequency resource set comprises:

The first time-frequency resource set is determined according to pre-configuration 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 pre-configuration information ；

or,

The pre-configuration information directly indicates the time domain density size of the first time-frequency resource set;

and / or,

The frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is indicated by the pre-configuration information; or,

The pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set;

and / or,

The pre-configuration information indicating the frequency domain position of the first time-frequency resource set includes:

The pre-configuration information indicates the subcarriers occupied by the first time-frequency resource set in one RB; or,

The pre-configuration information indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set;

and / or,

The preconfiguration information indicates that the time domain start position of the first time-frequency resource set is a first time domain start position, wherein the first time domain start position is no later than the first data and The time domain start position of the second data;

The second time-frequency resource set is determined according to the pre-configuration information, where:

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 pre-configuration information;

or,

The pre-configuration information directly indicates the time domain density size of the second time-frequency resource set;

and / or,

The frequency domain density of the second time-frequency resource set is determined according to the second number of RBs, where the second number of RBs is indicated by the pre-configuration information; or,

The pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set;

and / or,

The pre-configuration information indicating the frequency domain position of the second time-frequency resource set includes:

The pre-configuration information indicates the subcarriers occupied by the second time-frequency resource set in one RB; or,

The preconfiguration information indicates the DMRS port number associated with the second time-frequency resource set, where 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 codes Division and multiplexing CDM group;

and / or,

The pre-configuration information indicates that the time domain start position of the second time-frequency resource set is the first time domain start position.
The method according to claim 3, wherein the indicating the frequency domain position of the second time-frequency resource set comprises:

Determine the 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 includes 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 preset one of the odd-numbered sub-carriers in each RB;

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

The second set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or,

The second set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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 time-frequency resource set is 1000, or,

The second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The method according to claim 4, wherein the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The second time-frequency resource set occupies the subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 2 in each RB.
The method according to claim 3, wherein the indicating the frequency domain position of the first time-frequency resource set comprises:

Determine the second demodulation reference signal DMRS port number corresponding to the 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 time-frequency resource set is 1002, or,

The first time-frequency resource set occupies a preset subcarrier among the 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 time-frequency resource set is 1000, or,

The first set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the first time-frequency resource set is 1004, or,

The first set of time-frequency resources occupies a preset subcarrier among subcarriers numbered 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 time-frequency resource set is 1002, or,

The first set of time-frequency resources occupies one preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The method according to claim 6, wherein the first time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies the subcarrier numbered 2 in each RB.
The method according to any one of claims 2-7, wherein the first DCI includes a first field, the second DCI includes a second field, and the first field or the first field The two fields are used to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data respectively, and the position relationship includes at least one of the following:

The time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.
The method according to claim 8, wherein the position relationship is used to determine the frequency domain density of the second time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the first DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the second time-frequency resource set is equal to X, and the X is determined according to the first field Or it is determined according to high-level configuration parameters, X takes the value of 2 or 4;

The location relationship is used to determine the frequency domain density of the first time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the second DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is determined according to the second field Or it is determined according to the high-level configuration parameters, and the value of Y is 2 or 4.
The method according to any one of claims 1-9, wherein the method further comprises:

Sending high-layer signaling, where the high-layer signaling is used to indicate the first time-frequency resource set and at least one second time-frequency resource set.
A method for data transmission, characterized in that it comprises:

Determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and the at least one second data, and the remaining time-frequency resource set is a preset time-frequency Divide the first time-frequency resource set and the at least one second time-frequency resource set from the resource set,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used for demodulation The first data and the at least one second PTRS are respectively used to demodulate the at least one second data;

Receiving the first data and the at least one second data.
The method of claim 11, wherein the method further comprises:

Receive first downlink control information DCI and at least one second DCI, where the at least one second DCI is used to schedule the at least one second data, and the first DCI is used to schedule the first data.
The method according to claim 12, wherein the determining a first time-frequency resource set and a second time-frequency resource set corresponding to the second codeword comprises:

The first time-frequency resource set is determined according to pre-configuration 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 pre-configuration information ；

Or, the pre-configuration information directly indicates the time domain density of the first time-frequency resource set;

The frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is indicated by the pre-configuration information;

Or, the pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set;

The pre-configuration information indicating the frequency domain position of the first time-frequency resource set includes:

The pre-configuration information indicates subcarriers occupied by the first time-frequency resource set in one RB;

Alternatively, the pre-configuration information indicates a demodulation reference signal DMRS port number associated with the first time-frequency resource set;

The preconfiguration information indicates that the time domain start position of the first time-frequency resource set is a first time domain start position, wherein the first time domain start position is no later than the first data and The time domain start position of the second data;

Determining a second time-frequency resource set according to the pre-configuration 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 pre-configuration information;

Or, the pre-configuration information directly indicates the time-domain density size of the second time-frequency resource set;

The frequency domain density of the second time-frequency resource set is determined according to a second number of RBs, where the second number of RBs is indicated by the pre-configuration information;

Or, the pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set;

The pre-configuration information indicating the frequency domain position of the second time-frequency resource set includes: the pre-configuration information indicating the subcarriers occupied by the second time-frequency resource set in one RB;

Alternatively, the pre-configuration information indicates the DMRS port number associated with the second time-frequency resource set, where 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 pre-configuration information indicates that the time domain start position of the second time-frequency resource set is the first time domain start position.
The method according to claim 13, wherein the indicating the frequency domain position of the second time-frequency resource set comprises:

Determine the 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 includes 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 preset one of the odd-numbered sub-carriers in each RB;

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

The second set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or,

The second set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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 time-frequency resource set is 1000, or,

The second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The method according to claim 14, wherein the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The second time-frequency resource set occupies the subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 2 in each RB.
The method according to claim 13, wherein the indicating the frequency domain position of the first time-frequency resource set comprises:

Determine the second demodulation reference signal DMRS port number corresponding to the 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 time-frequency resource set is 1002, or,

The first time-frequency resource set occupies a preset subcarrier among the 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 the port numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, or,

The first set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the first time-frequency resource set is 1004, or,

The first set of time-frequency resources occupies a preset subcarrier among subcarriers numbered 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 time-frequency resource set is 1002, or,

The first set of time-frequency resources occupies one preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The method according to claim 16, wherein the first time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies the subcarrier numbered 2 in each RB.
The method according to any one of claims 12-17, wherein the first DCI includes a first field, the second DCI includes a second field, and the first field or the first field The two fields are used to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data respectively, and the position relationship includes at least one of the following:

The time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.
The method according to claim 18, wherein the position relationship is used to determine the frequency domain density of the second time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the first DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the second time-frequency resource set is equal to X, and the X is determined according to the first field Or it is determined according to high-level configuration parameters, X takes the value of 2 or 4;

The location relationship is used to determine the frequency domain density of the first time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the second DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is determined according to the second field Or it is determined according to the high-level configuration parameters, and the value of Y is 2 or 4.
The method according to any one of claims 11-19, wherein the method further comprises:

Receiving high-layer signaling, where the high-layer signaling is used to indicate the first time-frequency resource set and at least one second time-frequency resource set.
A device for data transmission, characterized in that it comprises:

The processing unit is configured to determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and at least one second data, and the remaining time-frequency resource set is preset A set 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 the set of time-frequency resources,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used for demodulation The first data, the at least one second PTRS is used to demodulate the at least one second data;

The sending unit is configured to send the first data and the at least one second data.
The apparatus according to claim 21, wherein the sending unit is further configured to send the first downlink control information DCI and at least one second DCI, wherein the at least one second DCI is respectively used for scheduling the station The at least one second data, and the first DCI is used to schedule the first data.
The apparatus according to claim 22, wherein the processing unit determining the first time-frequency resource set and the second time-frequency resource set comprises:

The processing unit determines the first time-frequency resource set according to pre-configuration 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 the preset As indicated by the configuration information;

or,

The pre-configuration information directly indicates the time domain density size of the first time-frequency resource set;

and / or,

The frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is indicated by the pre-configuration information; or,

The pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set;

and / or,

The pre-configuration information indicating the frequency domain position of the first time-frequency resource set includes:

The pre-configuration information indicates the subcarriers occupied by the first time-frequency resource set in one RB; or,

The pre-configuration information indicates the demodulation reference signal DMRS port number associated with the first time-frequency resource set;

and / or,

The preconfiguration information indicates that the time domain start position of the first time-frequency resource set is a first time domain start position, wherein the first time domain start position is no later than the first data and The time domain start position of the second data;

The processing unit determines a second time-frequency resource set according to the pre-configuration information, where:

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 pre-configuration information;

or,

The pre-configuration information directly indicates the time domain density size of the second time-frequency resource set;

and / or,

The frequency domain density of the second time-frequency resource set is determined according to the second number of RBs, where the second number of RBs is indicated by the pre-configuration information; or,

The pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set;

and / or,

The pre-configuration information indicating the frequency domain position of the second time-frequency resource set includes:

The pre-configuration information indicates the subcarriers occupied by the second time-frequency resource set in one RB; or,

The preconfiguration information indicates the DMRS port number associated with the second time-frequency resource set, where 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 codes Division and multiplexing CDM group;

and / or,

The pre-configuration information indicates that the time domain start position of the second time-frequency resource set is the first time domain start position.
The apparatus according to claim 23, wherein the indicating the frequency domain position of the second time-frequency resource set comprises:

The processing unit determines the 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 includes 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 preset one of the odd-numbered sub-carriers in each RB;

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

The second set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or,

The second set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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, and the DMRS port number associated with the second time-frequency resource set is 1000, or,

The second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The apparatus according to claim 24, wherein the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The second time-frequency resource set occupies the subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 2 in each RB.
The apparatus according to claim 23, wherein the indicating the frequency domain position of the first time-frequency resource set comprises:

The processing unit determines the second demodulation reference signal DMRS port number corresponding to the 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 time-frequency resource set is 1002, or,

The first time-frequency resource set occupies a preset subcarrier among the 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 the port numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, or,

The first set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the first time-frequency resource set is 1004, or,

The first set of time-frequency resources occupies a preset subcarrier among subcarriers numbered 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 time-frequency resource set is 1002, or,

The first set of time-frequency resources occupies one preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The apparatus according to claim 26, wherein the first time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The subcarrier numbered 1 occupied by the first time-frequency resource set in each RB; or,

The subcarrier numbered 0 occupied by the first time-frequency resource set in each RB; or,

The subcarrier numbered 2 occupied by the first time-frequency resource set in each RB.
The apparatus according to any one of claims 22-27, wherein the first DCI includes a first field, the second DCI includes a second field, and the first field or the first field The two fields are used to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data respectively, and the position relationship includes at least one of the following:

The time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.
The apparatus according to claim 28, wherein the position relationship is used to determine the frequency domain density of the second time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the first DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the second time-frequency resource set is equal to X, and the X is determined according to the first field Or it is determined according to high-level configuration parameters, X takes the value of 2 or 4;

The location relationship is used to determine the frequency domain density of the first time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the second DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is determined according to the second field Or it is determined according to the high-level configuration parameters, and the value of Y is 2 or 4.
The device according to any one of claims 21-29, wherein the device further comprises:

Sending high-layer signaling, where the high-layer signaling is used to indicate the first time-frequency resource set and at least one second time-frequency resource set.
A device for data transmission, characterized in that it comprises:

The processing unit is configured to determine a first time-frequency resource set and at least one second time-frequency resource set, the remaining time-frequency resource set is used to map the first data and the at least one second data, and the remaining time-frequency resource set is Dividing the first time-frequency resource set and the at least one second time-frequency resource set from the preset time-frequency resource set,

Wherein, the first time-frequency resource set is used to carry a first phase tracking reference signal PTRS, the at least one second time-frequency resource set is used to carry at least one second PTRS, and the first PTRS is used to Demodulate the first data, and the at least one second PTRS is used to demodulate the at least one second data;

The receiving unit is configured to receive the first data and the at least one second data.
The apparatus according to claim 31, wherein the receiving unit is further configured to receive first downlink control information DCI and at least one second DCI, wherein the at least one second DCI is used to schedule the The at least one second data, and the first DCI is used to schedule the first data.
The apparatus according to claim 32, wherein the processing unit determining the first time-frequency resource set and the second time-frequency resource set corresponding to the second codeword comprises:

The processing unit determines the first time-frequency resource set according to pre-configuration 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 the preset As indicated by the configuration information;

Or, the pre-configuration information directly indicates the time domain density of the first time-frequency resource set;

The frequency domain density of the first time-frequency resource set is determined according to the number of first resource block RBs, where the first number of RBs is indicated by the pre-configuration information;

Or, the pre-configuration information directly indicates the frequency domain density of the first time-frequency resource set;

The pre-configuration information indicating the frequency domain position of the first time-frequency resource set includes:

The pre-configuration information indicates subcarriers occupied by the first time-frequency resource set in one RB;

Alternatively, the pre-configuration information indicates a demodulation reference signal DMRS port number associated with the first time-frequency resource set;

The preconfiguration information indicates that the time domain start position of the first time-frequency resource set is a first time domain start position, wherein the first time domain start position is no later than the first data and The time domain start position of the second data;

The processing unit determines a second time-frequency resource set according to the pre-configuration information, where the time-domain density of the second time-frequency resource set is determined according to a second MCS, and the second MCS indicates the pre-configuration information of;

Or, the pre-configuration information directly indicates the time-domain density size of the second time-frequency resource set;

The frequency domain density of the second time-frequency resource set is determined according to a second number of RBs, where the second number of RBs is indicated by the pre-configuration information;

Or, the pre-configuration information directly indicates the frequency domain density of the second time-frequency resource set;

The pre-configuration information indicating the frequency domain position of the second time-frequency resource set includes: the pre-configuration information indicating the subcarriers occupied by the second time-frequency resource set in one RB;

Alternatively, the pre-configuration information indicates the DMRS port number associated with the second time-frequency resource set, where 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 pre-configuration information indicates that the time domain start position of the second time-frequency resource set is the first time domain start position.
The apparatus according to claim 33, wherein the indicating the frequency domain position of the second time-frequency resource set comprises:

The processing unit determines the 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 includes 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 preset one of the odd-numbered sub-carriers in each RB;

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

The second set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the second time-frequency resource set is 1003, or,

The second set of time-frequency resources occupies a preset one of the sub-carriers except those numbered 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, and the DMRS port number associated with the second time-frequency resource set is 1000, or,

The second time-frequency resource set occupies a preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The apparatus according to claim 34, wherein the second time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The second time-frequency resource set occupies the subcarrier numbered 0 in each RB; or,

The second set of time-frequency resources occupies a subcarrier numbered 2 in each RB.
The apparatus according to claim 33, wherein the indicating the frequency domain position of the first time-frequency resource set comprises:

The processing unit determines the second demodulation reference signal DMRS port number corresponding to the 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 time-frequency resource set is 1002, or,

The first time-frequency resource set occupies a preset subcarrier among the 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 the port numbers 1002 and 1003, the DMRS port number associated with the first time-frequency resource set is 1000, or,

The first set of time-frequency resources occupies a preset one of the even-numbered sub-carriers 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 1000 and 1001, the DMRS port number associated with the first time-frequency resource set is 1004, or,

The first set of time-frequency resources occupies a preset subcarrier among subcarriers numbered 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 time-frequency resource set is 1002, or,

The first set of time-frequency resources occupies one preset subcarrier numbered 0, 1, 6, and 7 in each RB.
The apparatus according to claim 36, wherein the first time-frequency resource set occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 1 in each RB; or,

The first set of time-frequency resources occupies a subcarrier numbered 0 in each RB; or,

The first set of time-frequency resources occupies the subcarrier numbered 2 in each RB.
The apparatus according to any one of claims 32-37, wherein the first DCI includes a first field, the second DCI includes a second field, and the first field or the first field The two fields are used to indicate the position relationship of the time-frequency resource set occupied by the first data and the second data respectively, and the position relationship includes at least one of the following:

The time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap;

The time domain resources and/or frequency domain resources occupied by the first data and the second data respectively do not overlap.
The device according to claim 38, wherein the position relationship is used to determine the frequency domain density of the second time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the first DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the second time-frequency resource set is equal to X, and the X is determined according to the first field Or it is determined according to high-level configuration parameters, X takes the value of 2 or 4;

The location relationship is used to determine the frequency domain density of the first time-frequency resource set;

If the time domain resources and/or frequency domain resources respectively occupied by the first data and the second data completely overlap, 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 frequency domain resource indication information in the second DCI;

If the time domain resources and/or frequency domain resources occupied by the first data and the second data partially overlap, the frequency domain density of the first time-frequency resource set is equal to Y, and the Y is determined according to the second field Or it is determined according to the high-level configuration parameters, and the value of Y is 2 or 4.
The device according to any one of claims 31-39, wherein the device further comprises:

Receiving high-layer signaling, where the high-layer signaling is used to indicate the first time-frequency resource set and at least one second time-frequency resource set.
A communication device, characterized by comprising:

A memory, which is used to store a computer program;

Transceiver, the transceiver is used to perform transceiving steps;

A processor, configured to call and run the computer program from the memory, so that the communication device executes the method according to any one of claims 1-20.
A computer-readable storage medium, comprising: the computer-readable medium stores a computer program; when the computer program is run on a computer, the computer executes any one of claims 1-20 method.
A communication system, characterized in that it comprises:

The device for data transmission according to any one of claims 21-30 and the device for data transmission according to any one of claims 31-40.