CN108631836B

CN108631836B - Data transmission method and device

Info

Publication number: CN108631836B
Application number: CN201710184478.8A
Authority: CN
Inventors: 刘鹍鹏; 李雪茹
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-03-24
Filing date: 2017-03-24
Publication date: 2021-07-16
Anticipated expiration: 2037-03-24
Also published as: CN108631836A

Abstract

The embodiment of the application provides a data transmission method and a data transmission device, wherein the method comprises the following steps: the network equipment determines the size of a first precoding resource block group (PRG), wherein the first PRG is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain; the network equipment determines a second PRG size, wherein the second PRG size is used for indicating the number of PRBs which use the same second precoding matrix and are continuously distributed on a frequency domain; the network device signals the first PRG size and the second PRG size. The data transmission method and device in the embodiment of the application can reasonably configure the precoding matrix used by the terminal equipment under the condition that the terminal equipment adopts a plurality of antenna port groups for uplink transmission jointly, thereby being beneficial to improving the transmission performance of uplink data.

Description

Data transmission method and device

Technical Field

The embodiment of the application relates to the field of communication, in particular to a method and a device for data transmission in the field of communication.

Background

A terminal device and a network device need to occupy a certain time-frequency resource for uplink communication, that is, a plurality of subcarriers on a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, one subcarrier on one OFDM symbol is called a Resource Element (RE), and 12 consecutive REs form one Physical Resource Block (PRB). A terminal device having multiple transmit antennas needs to precode data before transmitting the data to a network device. The network device can pre-code a layer of data to be transmitted, so as to improve the receiving power of the terminal device to the data, and can also pre-code multiple layers of data to be transmitted, so as to reduce the interference among the multiple layers of data and improve the data transmission performance. The choice of precoding is related to the channel, which has frequency selectivity, and different precoding matrices need to be used by the terminal device on different REs within one OFDM symbol. The precoding matrix used by the terminal device may be signaled by the network device. In a Long Term Evolution (LTE) system, considering that an uplink bandwidth is relatively small, a terminal device uses the same precoding matrix in the entire uplink bandwidth.

In the next generation communication system, the bandwidth of uplink communication will be large, for example, 100MHz, and the channels have large difference in the whole bandwidth, which will result in large performance loss if the same precoding matrix is used in the whole bandwidth. Therefore, uplink communication will support frequency selective fading, i.e. different precoding matrices can be employed on different PRBs. Since the channels of adjacent PRBs are similar, the terminal device may use the same precoding matrix on the adjacent PRBs. The number of PRBs using the same precoding matrix is referred to as a precoding resource block group size (PRG size). The size of the PRG size may be signaled by the network device to the terminal device.

However, in the next generation communication system, the terminal device generally has a plurality of antenna port groups, for example, each antenna port group corresponds to one antenna panel, each antenna port group has a plurality of transmitting antennas, and the terminal device can select one or more antenna port groups to perform uplink communication with the network device. In a case where a terminal device uses a plurality of antenna port groups, there is a phase difference between channels of the plurality of antenna port groups, and therefore, when the terminal device uses the plurality of antenna port groups for joint data transmission, the network device needs to configure, for the terminal device, a precoding matrix capable of reflecting the phase difference between the channels of the plurality of antenna port groups and the number of PRBs using the same precoding matrix. Because the speed of the change of the phase difference of the channels among the antenna port groups in the frequency domain is different from the speed of the change of the channel of one antenna port group in the frequency domain, the network device only configures one PRG size for the terminal device and simultaneously applies the PRG size to the precoding matrix of each antenna port group and the precoding matrix among the antenna port groups, which may cause the uplink transmission performance to be damaged or the signaling overhead of the precoding matrix to be increased.

Disclosure of Invention

The data transmission method and the data transmission device provided by the embodiment of the application can reasonably configure the precoding matrix used by the terminal equipment under the condition that the terminal equipment adopts the joint transmission of a plurality of antenna port groups, thereby being beneficial to improving the transmission performance of uplink data.

In a first aspect, a data transmission method is provided, including: the method comprises the steps that network equipment determines the size of a first precoding resource block group (PRG), wherein the first PRG is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain, the first precoding matrix is the precoding matrix of any one antenna port group in at least two antenna port groups of terminal equipment, and each antenna port group in the at least two antenna port groups comprises at least two antenna ports; the network equipment determines a second PRG size, wherein the second PRG size is used for indicating the number of PRBs which use the same second precoding matrix and are continuously distributed on a frequency domain, and the second precoding matrix comprises a phase difference between first precoding matrices of any two antenna port groups in the at least two antenna port groups; the network device signaling the first PRG size and the second PRG size.

Specifically, the network device may determine a first precoding resource block group PRG size M (i.e., a first PRG size) and a second PRG size N (i.e., a second PRG size), and transmit the first PRG size and the second PRG size to the terminal device, where the first precoding matrix used in M PRBs continuously distributed in the frequency domain by the terminal device is the same, and the second precoding matrix used in N PRBs continuously distributed in the frequency domain by the terminal device is the same. After the terminal device receives the first PRG size and the second PRG size sent by the network device, the terminal device may determine, according to the first PRG size and the second PRG size, and the first precoding matrix and/or the second precoding matrix indicated by the signaling by the network device, a precoding matrix used for the data on each PRB during the final uplink transmission.

It should be understood that the above-mentioned first precoding matrix is a precoding matrix of any one antenna port group of at least two antenna port groups of the terminal device, for example, the terminal device has three antenna port groups, an antenna port group 1, an antenna port group 2, and an antenna port group 3, and then the three antenna port groups respectively have respective first precoding matrices, that is, the first precoding matrix of the antenna port group 1, the first precoding matrix of the antenna port group 2, and the first precoding matrix of the antenna port group 3, which may be the same or different, and this is not limited in this embodiment of the present application.

It should also be understood that the above-mentioned second precoding matrix is used to indicate a phase difference between the first precoding matrices of any two antenna port groups of the terminal device, and likewise, taking the terminal device having three antenna port groups as an example, the terminal device has 3 first precoding matrices and 1 second precoding matrix, where the second precoding matrices include a phase difference between the first precoding matrix of antenna port group 1 and the first precoding matrix of antenna port group 2, and a phase difference between the first precoding matrix of antenna port group 1 and the first precoding matrix of antenna port group 3. Generally, a network device configures a fixed antenna port group, and measures a phase difference of a first precoding matrix between other antenna port groups and the fixed antenna port group, but the present application is not limited thereto.

According to the data transmission method provided by the embodiment of the application, the network equipment is used for configuring the PRG size of the first precoding matrix and the PRG size of the second precoding matrix for the terminal equipment respectively, so that the precoding matrix adopted by the terminal equipment is more reasonable under the condition that the terminal equipment adopts a plurality of antenna port groups for combined transmission, and the transmission performance of uplink data is improved.

In a first possible implementation manner of the first aspect, the signaling, by the network device, the first PRG size and the second PRG size includes: the network equipment sends the first PRG size through any one of Downlink Control Information (DCI) and Radio Resource Control (RRC) signaling; and/or the network device transmits the second PRG size through any one of DCI and RRC signaling.

It should be understood that, the network device sends the first PRG size and/or the second PRG size using the DCI, which is beneficial for the terminal device to perform fast detection, that is, the terminal device may obtain the first PRG size and/or the second PRG size in a subframe where the network device sends the DCI, so that timely receiving of the first PRG size and/or the second PRG size can be ensured. The network equipment sends the first PRG size and/or the second PRG size by adopting RRC signaling, is suitable for the condition that the first PRG size and/or the second PRG size are slowly changed, and can save signaling overhead.

In addition, the network device may further transmit the first PRG size and/or the second PRG size through a Multiple Access Control (MAC) layer Control Element (CE), which is not limited in this embodiment of the present application.

With reference to the foregoing possible implementation manners of the first aspect, in a second possible implementation manner of the first aspect, the method further includes: the network equipment sends at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI through signaling, wherein the first TPMI and/or the SRI are used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

Specifically, the first precoding matrix may be indicated by the network device in two ways, namely, a first Transmission Precoding Matrix Indicator (TPMI) or a reference Signal Resource Indicator (SRI). For the second precoding matrix, after determining the first precoding matrix of each antenna port group in the multiple antenna port groups, the network device may determine the second precoding matrix between the multiple antenna port groups and use the second TPMI for indication.

With reference to the foregoing possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the sending, by the network device, the first PRG size and the second PRG size through signaling includes: the network equipment transmits the first PRG size and/or the second PRG size to the terminal equipment through first DCI; the network equipment sends at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI by signaling, and the method comprises the following steps: the network equipment transmits at least one of the first TPMI, the SRI and the second TPMI to the terminal equipment through second DCI; and the first DCI is used for indicating the time-frequency resource position occupied by the second DCI.

It should be understood that the network device may send the first PRG size through the first DCI, send the second PRG size through RRC signaling or other signaling, or send the second PRG size through the first DCI, and send the first PRG size through RRC signaling or other signaling, which is not limited in this embodiment of the application. It should also be understood that the network device may send the first TPMI or SRI through the second DCI, send the second TPMI through RRC signaling or other signaling, and also send the second TPMI through the second DCI, and send the first TPMI or SRI through RRC signaling or other signaling, which is also not limited in this embodiment of the present application.

With reference to the foregoing possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, a sum of bit numbers occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or the sum of the bit numbers occupied by the SRI and the second TPMI in the second DCI is a preset fixed value.

It should be understood that the total number of bits of the first TPMI (or SRI) and the second TPMI is a fixed value, which has the advantage that the complexity of blind detection of DCI by the terminal equipment can be reduced. In addition, the network device may flexibly allocate P bits to the first TPMI and the second TPMI according to a channel state, thereby optimizing performance of uplink transmission with a fixed bit overhead. For example, when the PRG size of the second precoding matrix is smaller than the PRG size of the first precoding matrix, more bits of the P bits are used to indicate the second TPMI, which may increase the frequency domain granularity of the second TPMI while decreasing the frequency domain granularity of the first TPMI (or SRI). Similarly, when the PRG size of the second precoding matrix is smaller than the PRG size of the first precoding matrix, more bits of the P bits are used to indicate the first TPMI (or SRI), which may increase the frequency domain granularity of the first TPMI (or SRI) while decreasing the frequency domain granularity of the second TPMI.

In summary, the network device may optimize the performance of uplink transmission as much as possible by flexibly configuring the PRG size of the first precoding matrix and the PRG size of the second precoding matrix under the condition of fixed signaling overhead, thereby improving user experience.

With reference to the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the method for transmitting, by the network device to the terminal device through the second DCI, at least one of the first TPMI, the SRI, and the second TPMI includes: and the network equipment transmits the second sub TPMI and/or the second TPMI to the terminal equipment through the second DCI.

Therefore, in this embodiment of the present application, the network device sends the first TPMI to the terminal device through the second DCI, which may be that the network device sends the second sub-TPMI in the first TPMI to the terminal device through the second DCI, so as to save signaling overhead.

It should be understood that the terminal device may have only a single polarized antenna in the antenna port set, or may have dual polarized antennas. When the antenna port group of the terminal device has only a single polarized antenna, the second sub TPMI configured for the terminal device by the network device may select at least one basis vector from only the first basis vector group. For example, when the Rank Indication (RI) configured by the network device for the terminal device is equal to 1, the second sub TPMI is used to select one basis vector from the first basis vector group; when the RI is equal to 2, the second sub TPMI is used to select one basis vector, i.e., two basis vectors, from the first set of basis vectors for transmission of each layer of data. When the antenna port group of the terminal device has dual-polarized antennas, the second sub TPMI configured for the terminal device by the network device is used to select at least one basis vector from the first basis vector group for antennas of two polarization directions, respectively, and select a phase difference between the two basis vectors. For example, when the RI configured by the network device for the terminal device is equal to 1, the second sub TPMI is configured to select one basis vector from the first basis vector group and determine a phase difference between the two basis vectors; when RI is equal to 2, the second sub TPMI is used to select one basis vector and a phase difference, i.e., two basis vectors and two phase differences, from the first basis vector group for each layer of data. At least one base vector selected by the antennas in the two polarization directions may be the same or different, and this is not limited in this embodiment of the application.

With reference to the foregoing possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes: and the network equipment transmits the first sub TPMI to the terminal equipment through the first DCI.

Specifically, since the first sub TPMI is a wideband long-term parameter, the network device may transmit the first sub TPMI through the first DCI. Further, the network device may transmit the first sub TPMI simultaneously with the first PRG size and/or the second PRG size carried in the first DCI, which is not limited in this embodiment of the present application.

In a second aspect, another data transmission method is provided, including: the method comprises the steps that terminal equipment receives a first precoding resource block group PRG size and a second PRG size, wherein the first PRG size is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain, the first precoding matrix is the precoding matrix of any one antenna port group in at least two antenna port groups of the terminal equipment, each antenna port group in the at least two antenna port groups comprises at least two antenna ports, the second PRG size is used for indicating the number of PRBs which use the same second precoding matrix and are continuously distributed on the frequency domain, and the second precoding matrix comprises a phase difference between the first precoding matrices of any two antenna port groups in the at least two antenna port groups; and the terminal equipment determines a precoding matrix adopted by the terminal equipment on each PRB according to the first PRG size and the second PRG size.

In a first possible implementation manner of the second aspect, the receiving, by the terminal device, the first precoding resource block group PRG size and the second PRG size includes: the terminal equipment receives downlink control information DCI, wherein the DCI comprises any one of the first PRG size and the second PRG size; and/or the terminal device receiving radio resource control, RRC, signaling, the RRC including any one of the first PRG size and the second PRG size.

With reference to the foregoing possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the method further includes: the terminal equipment receives at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI are used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

With reference to the foregoing possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the receiving, by the terminal device, the first precoding resource block group PRG size and the second PRG size includes: the terminal equipment receives first DCI, wherein the first DCI comprises the first PRG size and/or the second PRG size; the terminal equipment receives at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, and comprises the following steps: the terminal equipment receives second DCI, wherein the second DCI comprises at least one of the first TPMI, the SRI and the second TPMI; and the first DCI is used for indicating the time-frequency resource position occupied by the second DCI.

With reference to the foregoing possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, a sum of bit numbers occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or the sum of the bit numbers occupied by the SRI and the second TPMI in the second DCI is a preset fixed value.

With reference to the foregoing possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the first TPMI includes a first sub-TPMI and a second sub-TPMI, the first sub-TPMI is configured to indicate a first basis vector group, the second sub-TPMI is configured to select at least one basis vector from the first basis vector group, and the second DCI includes the second sub-TPMI and/or the second TPMI.

With reference to the foregoing possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, the method further includes: the terminal device receives the first DCI, which includes the first sub-TPMI.

With reference to the foregoing possible implementation manners of the second aspect, in a seventh possible implementation manner of the second aspect, the method further includes: the terminal device receives the first DCI, wherein the first DCI comprises resource allocation information, and the resource allocation information is used for indicating resources allocated to the terminal device by the network device; the terminal equipment determines the number of the first TPMI according to the resource allocation information and the size of the first PRG; and the terminal equipment determines the number of the second TPMI according to the resource allocation information and the size of the second PRG.

A third aspect provides a data transmission apparatus configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the apparatus comprises means for performing the method of the first aspect described above or any one of the possible implementations of the first aspect.

In a fourth aspect, a data transmission apparatus is provided for performing the method of the second aspect or any possible implementation manner of the second aspect. In particular, the apparatus comprises means for performing the method of the second aspect or any of the possible implementations of the second aspect.

In a fifth aspect, there is provided a data transmission apparatus, comprising: a transceiver, a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control a receiver to receive signals and a transmitter to transmit signals, and when the instructions stored by the memory are executed by the processor, the execution causes the processor to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a sixth aspect, there is provided a data transmission apparatus, comprising: a transceiver, a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to execute the method of the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a data transmission system is provided, which includes the apparatus in any one of the above third aspect or any one of the possible implementations of the third aspect and the apparatus in any one of the fourth aspect or any one of the possible implementations of the fourth aspect; or

The system comprises the apparatus of any of the possible implementations of the fifth aspect or the fifth aspect described above and the apparatus of any of the possible implementations of the sixth aspect or the sixth aspect.

In an eighth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation manner of the first aspect.

In a ninth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for performing the method of the second aspect or any possible implementation of the second aspect.

Drawings

Fig. 1 shows a schematic diagram of a communication system of an embodiment of the present application.

Fig. 2 shows a schematic flow chart of a data transmission method according to an embodiment of the application.

Fig. 3 shows a schematic block diagram for a data transmission apparatus according to an embodiment of the present application.

Fig. 4 shows a schematic block diagram of another data transmission apparatus according to an embodiment of the present application.

Fig. 5 shows a schematic block diagram of another data transmission apparatus according to an embodiment of the present application.

Fig. 6 shows a schematic block diagram of another data transmission apparatus according to an embodiment of the present application.

Detailed Description

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

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

Fig. 1 shows a communication system 100 to which an embodiment of the present application is applied. The communication system 100 may include at least one network device 110. Network device 100 may be a device that communicates with terminal devices, such as a base station or base station controller. Each network device 100 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within that coverage area (cell). The network device 100 may be a Base Transceiver Station (BTS) in a GSM system or a Code Division Multiple Access (CDMA) system, a base station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a future 5G network, or a network device in a future evolved Public Land Mobile Network (PLMN), and the like.

The wireless communication system 100 also includes a plurality of terminal devices 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. The terminal equipment 120 may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto.

Fig. 2 shows a schematic flow chart 200 of a data transmission method of an embodiment of the present application. The method 200 may be applied to the communication system 100 shown in fig. 1, but the embodiment of the present application is not limited thereto.

S210, a network device determines the size of a first precoding resource block group PRG, wherein the first PRG is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain, and the first precoding matrix is the precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device;

s220, the network device determines a second PRG size, where the second PRG size is used to indicate the number of PRBs that use the same second precoding matrix and are continuously distributed in the frequency domain, and the second precoding matrix is used to indicate a phase difference between first precoding matrices of any two antenna port groups of the at least two antenna port groups;

s230, the network device sends the first PRG size and the second PRG size through signaling;

correspondingly, the terminal device receives the first PRG size and the second PRG size sent by the network device;

s240, the terminal device determines a precoding matrix adopted by the terminal device on each PRB according to the first PRG size and the second PRG size.

For example, on a certain Resource Element (RE), the first precoding matrix of antenna port group 1 is X1, the first precoding matrix of antenna port group 3 is X2, and the first precoding matrix of antenna port group 3 is X3. Where the dimensions of the matrices X1, X2 and X3 are m × n, where m is the number of ports included in each antenna port group, the second precoding matrix may be in the form of a second precoding matrix on the RE

Wherein, I_mIs a unitary matrix of dimension m, θ₂、θ₃Phase differences between X1 and X2, and between X1 and X3, respectively, then on this RE, the precoding matrix used by the terminal device for the data may be

Since the terminal device generally has a plurality of transmitting antennas, the terminal device needs to precode data before transmitting the data to the network device. The choice of precoding is related to the channel, which has frequency selectivity, and different precoding matrices need to be used by the terminal device on different REs within one OFDM symbol. The precoding matrix used by the terminal device may be signaled by the network device. In a Long Term Evolution (LTE) system, considering that an uplink bandwidth is relatively small, a terminal device uses the same precoding matrix in the entire uplink bandwidth. However, in the next generation communication system, the bandwidth of uplink communication will be large, for example, 100MHz, and the channels have large difference in the whole bandwidth, which will result in large performance loss if the same precoding matrix is used in the whole bandwidth. Therefore, uplink communication will support frequency selective fading, i.e. different precoding matrices can be employed on different PRBs. Because the channels of the adjacent PRBs are similar, the terminal equipment can adopt the same precoding matrix on the adjacent PRBs, and the accuracy of channel estimation of the network equipment is improved. The number of PRBs using the same precoding matrix is referred to as a precoding resource block group size PRG size. The size of the PRG size may be signaled by the network device to the terminal device.

However, in the next generation communication system, the terminal device generally has a plurality of antenna port groups, each antenna port group has a plurality of transmitting antennas, and the terminal device can select one or more antenna port groups to perform uplink communication with the network device. In a case where a terminal device uses a plurality of antenna port groups, there is a phase difference between channels of the plurality of antenna port groups, and therefore, when the terminal device uses the plurality of antenna port groups for joint data transmission, the network device needs to configure, for the terminal device, a precoding matrix capable of reflecting the phase difference between the channels of the plurality of antenna port groups and the number of PRBs using the same precoding matrix. Specifically, since the antenna spacing between the plurality of antenna port groups is larger than the spacing between the plurality of antennas within one antenna port group, the phase difference of the channels of different antenna port groups varies in the frequency domain at a different rate from the rate at which the channel of one antenna port group varies in the frequency domain. For example, the propagation path correlation corresponding to different antenna port groups is low, and the propagation path correlation corresponding to different antenna ports in the same antenna port group is high. Therefore, the channel variation in the frequency domain caused by the phase difference between the propagation paths of different antenna port groups is different from the channel variation in the frequency domain caused by the phase difference between the propagation paths of different antenna ports in one antenna port group. Therefore, the PRG size of the second precoding matrix among the plurality of antenna port groups should use a different value from the PRG size of the first precoding matrix of each antenna port group. For another example, if the delay spread of the propagation paths corresponding to different antenna port groups is much larger than the delay spread of the propagation path corresponding to one antenna port group, the channel variation in the frequency domain caused by the phase difference between the propagation paths of different antenna port groups is faster than the channel variation in the frequency domain caused by the phase difference between the propagation paths of different antenna ports in one antenna port group. At this time, the PRG size of the second precoding matrix between the plurality of antenna port groups should be smaller than the PRG size of the first precoding matrix of each antenna port group. At this time, if only one PRG size is notified to be simultaneously applied to the first precoding matrix and the second precoding matrix, the uplink transmission performance is lost or the signaling overhead of the subsequent TPMI notification is increased. For example, if only the PRG size with a large value is notified, the precoding frequency domain granularity is not fine enough, and the uplink data transmission performance is damaged; if only the PRG size with a smaller value is notified, the number of the first precoding matrix or the second precoding matrix that needs to be indicated is increased, and further the signaling overhead of subsequently indicating the first precoding matrix or the second precoding matrix through signaling is increased.

In the data transmission method provided in the embodiment of the present application, the network device configures the PRG size of the first precoding matrix and the PRG size of the second precoding matrix for the terminal device, so that the precoding matrix adopted by the terminal device is more reasonable under the condition that the terminal device adopts the multiple antenna port groups for joint transmission, thereby being beneficial to improving the transmission performance of uplink data.

As an optional embodiment, the network device sends the first PRG size and the second PRG size through signaling, including:

the network equipment sends the first PRG size through any one of Downlink Control Information (DCI) and Radio Resource Control (RRC) signaling; and/or

The network device transmits the second PRG size through any one of DCI and RRC signaling.

Correspondingly, the receiving, by the terminal device, the first precoding resource block group PRG size and the second PRG size includes:

the terminal equipment receives downlink control information DCI, wherein the DCI comprises any one of the first PRG size and the second PRG size; and/or

The terminal device receives radio resource control, RRC, signaling, the RRC including any one of the first PRG size and the second PRG size.

Specifically, the network device may send the first PRG size to the terminal device through Downlink Control Information (DCI), or may send the first PRG size to the terminal device through Radio Resource Control (RRC) signaling; the network device may send the second PRG size to the terminal device through DCI, or may send the second PRG size to the terminal device through RRC, which is not limited in this embodiment of the present application.

As an optional embodiment, the method further comprises:

the network equipment sends at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI through signaling, wherein the first TPMI and/or the SRI are used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

Correspondingly, the terminal device receives at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI are/is used for indicating the first precoding matrix and the second TPMI is used for indicating the second precoding matrix.

Specifically, the first precoding matrix may be indicated by the network device in two ways, namely, a first Transmission Precoding Matrix Indicator (TPMI) or a reference Signal Resource Indicator (SRI).

(1) For uplink Multiple Input Multiple Output (MIMO) transmission based on a codebook, a terminal device needs to send a non-precoded/non-precoded Sounding Reference Signal (SRS) to a network device, and the network device receives the SRS sent by the terminal device, measures an uplink channel, selects a precoding matrix from the predefined codebook, and proposes the terminal device to use the precoding matrix. The selected precoding matrix is indicated in the codebook by the TPMI. Accordingly, the network device may determine a first TPMI by which to indicate a first precoding matrix.

(2) For uplink MIMO transmission not based on a codebook, the terminal device may select multiple precoding matrices by itself, for example, in a time division duplex system, the terminal device may determine multiple better precoding matrices according to measurement of a downlink reference signal (e.g., a channel state information reference signal (CSI-RS)) and reciprocity of a channel, and apply the multiple better precoding matrices to an SRS to form multiple different reference signal resources, where different reference signal resources occupy different time-frequency code resources. The network device measures the plurality of SRS resources, and selects an optimal SRS resource from the plurality of SRS resources, wherein a precoding matrix corresponding to the optimal SRS resource is the first precoding matrix. In this case, the network device sends the SRI to the terminal device to indicate the corresponding reference signal resource, and the terminal device may determine the precoding matrix used on the reference signal resource according to the SRI. Thus, the network device may indicate the first precoding matrix through the SRI.

It should be understood that the above two cases can be applied to the embodiments of the present application, and are not limited herein.

In addition, for the second precoding matrix, after determining the first precoding matrix of each antenna port group in the plurality of antenna port groups, the network device may determine the second precoding matrix between the plurality of antenna port groups and indicate with the second TPMI.

the network equipment transmits the first PRG size and/or the second PRG size to the terminal equipment through first DCI;

the network equipment sends at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI by signaling, and the method comprises the following steps:

the network equipment transmits at least one of the first TPMI, the SRI and the second TPMI to the terminal equipment through second DCI;

wherein the first DCI is used for indicating the time-frequency resource position of the second DCI.

the terminal equipment receives first DCI, wherein the first DCI comprises the first PRG size and/or the second PRG size;

the terminal equipment receives at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, and comprises the following steps:

the terminal device receives a second DCI, the second DCI including at least one of the first TPMI, the SRI, and the second TPMI.

Specifically, when the network device configures the first PRG size and/or the second PRG size to transmit by using DCI signaling, and the DCI signaling is a two-level DCI, the DCI signaling is divided into a first DCI and a second DCI, where the first DCI is used to indicate whether the second DCI exists, and in a case that the second DCI exists, the first DCI further indicates a time-frequency resource location of the second DCI. In an embodiment of the present application, the network device transmits the first PRG size and/or the second PRG size through a first DCI, and transmits at least one of the first TPMI, the SRI, and the second TPMI through a second DCI.

As an optional embodiment, the sum of the number of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or

And the sum of the bit numbers occupied by the SRI and the second TPMI in the second DCI is a preset fixed value.

Specifically, the sum of the number of bits of a field indicating the first TPMI (or SRI) of the first precoding matrix and the number of bits of a field indicating the second TPMI of the second precoding matrix may be a preset fixed value, for example, P bits, P being an integer greater than 0. The terminal device may correctly read the respective second TPMI and the respective first TPMI (or SRI) in the P bits according to the PRG size of the first precoding matrix and the PRG size of the second precoding matrix, and the number of bits of each second TPMI and the number of bits of each first TPMI (or SRI).

As an alternative embodiment, the first TPMI includes a first sub TPMI for indicating a first basis vector group and a second sub TPMI for selecting at least one basis vector from the first basis vector group,

the network device sends at least one of the first TPMI, the SRI, and the second TPMI to the terminal device through a second DCI, including:

and the network equipment transmits the second sub TPMI and/or the second TPMI to the terminal equipment through second DCI.

Correspondingly, the receiving, by the terminal device, at least one of the first TPMI, the SRI, and the second TPMI sent by the network device through a second DCI includes:

and the terminal equipment receives the second sub TPMI and/or the second TPMI sent by the network equipment through the second DCI.

Specifically, if the PRG size of the first precoding matrix is too small, i.e. the number of precoding resource block groups PRG is too large, this may result in a large number of first TPMI parameters, resulting in a too large overhead for the first TPMI. In order to reduce overhead, a dual codebook structure may be employed, i.e., the first TPMI includes a first sub TPMI and a second sub TPMI. Wherein the first sub-TPMI is used to indicate the first set of basis vectors, which are wideband long-term parameters, and are consistent throughout the uplink bandwidth. If it is the first TPMI that is periodically notified, the first sub TPMI may be notified once with a longer period; the second sub-TPMI is used to select at least one basis vector from the first set of basis vectors, which is a sub-band short-term parameter. If it is the first TPMI that is periodically notified, the second sub TPMI may be notified once with a shorter period. It is understood that different PRGs have different second sub-TPMI. The first precoding matrix indicated by the first TPMI is a matrix formed by the first basis vector group indicated by the first sub-TPMI and a matrix formed by at least one basis vector selected by the second sub-TPMI. Therefore, after the first sub TPMI is fixed, the network device may notify only the plurality of second sub TPMI, which may result in a significant reduction in signaling overhead of the network device.

The following description will be given taking as an example a case where each terminal device has a single-polarization antenna, a dual-polarization antenna, and RI 2.

(1) Terminal equipment is provided with dual polarized antenna

The set of first basis vectors of the first sub-TPMI indication constitutes a matrix

Wherein, { b₁,...,b_LIs said first set of basis vectors, L being a positive integer.

The basis vectors and phase differences of the second sub-TPMI selection constitute the following matrix

Wherein e is_iIs a vector of length L, the ith element is 1, and the remaining elements are 0.

And

the phase difference between the two polarization directions may be selected from a predefined set, which may be 0, pi/2, pi, 3 pi/2, for example, it being understood that,

and

and more other values can be obtained, which are not limited in the embodiments of the present application. The matrix W₂Selection of basis vectors b for the first layer data stream representing the second sub-TPMI_iPhase difference of sum

As a second layer data streamSelecting a basis vector b_jPhase difference of sum

(2) Terminal equipment with single polarization antenna

The set of first basis vectors of the first sub-TPMI indication constitutes the matrix W₁＝[b₁ … b_L]Wherein, b₁,...,b_LIs said first set of basis vectors, L being a positive integer.

The basis vectors and phase differences of the second sub-TPMI selection form a matrix W₂＝[e_i e_j]. Wherein e is_iIs a vector of length L, the ith element is 1, and the remaining elements are 0. The matrix W₂Selection of basis vectors b for the first layer data stream representing the second sub-TPMI_iSelecting a basis vector b for the second layer data stream_j。

As an optional embodiment, the method further comprises:

and the network equipment transmits the first sub TPMI to the terminal equipment through the first DCI.

As an optional embodiment, the method further comprises:

the network device sends resource allocation information to a terminal device through the first DCI, wherein the resource allocation information is used for indicating resources which can be used by the network device for data transmission for the terminal device;

correspondingly, the terminal device receives the resource allocation information sent by the network device through the first DCI;

the terminal equipment determines the number of the first TPMI according to the resource allocation information and the size of the first PRG;

and the terminal equipment determines the number of the second TPMI according to the resource allocation information and the size of the second PRG.

Specifically, the network device may send resource allocation information to the terminal device in the first DCI, after receiving the resource allocation information, the terminal device may determine, according to the resource allocation information, the number of PRBs allocated to itself by the network device, determine, according to the number of PRBs and the size of the first PRG, the number of first TPMI configured for the terminal device by the network device, and determine, according to the number of PRBs and the size of the second PRG, the number of second TPMI configured for the terminal device by the network device, which is beneficial to enabling the terminal device to correctly read the first TPMI and the second TPMI in a signaling notifying the first TPMI and the second TPMI, and improve data transmission performance.

It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The data transmission method according to the embodiment of the present application is described in detail above with reference to fig. 1 to 2, and the data transmission device according to the embodiment of the present application is described in detail below with reference to fig. 3 and 6.

Fig. 3 shows a data transmission apparatus 300 provided in an embodiment of the present application, where the apparatus 300 includes:

a first determining unit 310, configured to determine a first precoding resource block group PRG size, where the first PRG size is used to indicate a number of physical resource blocks PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, where the first precoding matrix is a precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device, and each antenna port group in the at least two antenna port groups includes at least two antenna ports;

a second determining unit 320, configured to determine a second PRG size, where the second PRG size is used to indicate the number of PRBs that use a same second precoding matrix and are continuously distributed in a frequency domain, and the second precoding matrix includes a phase difference between first precoding matrices of any two antenna port groups of the at least two antenna port groups;

a sending unit 330, configured to send the first PRG size and the second PRG size through signaling.

The data transmission device provided by the embodiment of the application configures the PRG size of the first precoding matrix and the PRG size of the second precoding matrix for the terminal equipment through the network equipment respectively, so that the precoding matrix adopted by the terminal equipment is more reasonable under the condition that the terminal equipment adopts the joint transmission of a plurality of antenna port groups, and the transmission performance of uplink data is favorably improved.

Optionally, the sending unit 330 is specifically configured to: transmitting the first PRG size through any one of Downlink Control Information (DCI) and Radio Resource Control (RRC) signaling; and/or transmitting the second PRG size through any one of DCI and RRC signaling.

Optionally, the sending unit 330 is further configured to: signaling at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI is used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

Optionally, the sending unit 330 is specifically configured to: transmitting the first PRG size and/or the second PRG size to the terminal device through first DCI; transmitting at least one of the first TPMI, the SRI and the second TPMI to the terminal device through a second DCI; and the first DCI is used for indicating the time-frequency resource position occupied by the second DCI.

Optionally, the sum of the number of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or the sum of the bit numbers occupied by the SRI and the second TPMI in the second DCI is a preset fixed value.

Optionally, the first TPMI includes a first sub TPMI and a second sub TPMI, the first sub TPMI is configured to indicate a first basis vector group, the second sub TPMI is configured to select at least one basis vector from the first basis vector group, and the transmitting unit 330 is specifically configured to: and transmitting the second sub TPMI and/or the second TPMI to the terminal equipment through the second DCI.

Optionally, the sending unit 330 is further configured to: and transmitting the first sub TPMI to the terminal equipment through the first DCI.

It should be understood that the apparatus 300 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an optional example, it may be understood by those skilled in the art that the apparatus 300 may be specifically a network device in the foregoing embodiment, and the apparatus 300 may be configured to perform each procedure and/or step corresponding to the network device in the foregoing method embodiment, and in order to avoid repetition, details are not described here again.

Fig. 4 shows another data transmission apparatus 400 provided in the embodiment of the present application, where the apparatus 400 includes:

a receiving unit 410, configured to receive a first precoding resource block group PRG size and a second PRG size, where the first PRG size is used to indicate a number of PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, the first precoding matrix is a precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device, each antenna port group in the at least two antenna port groups includes at least two antenna ports, the second PRG size is used to indicate a number of PRBs that use a same second precoding matrix and are continuously distributed in a frequency domain, and the second precoding matrix includes a phase difference between first precoding matrices of any two antenna port groups in the at least two antenna port groups;

a determining unit 420, configured to determine, according to the first PRG size and the second PRG size, a precoding matrix adopted by the terminal device on each PRB.

Optionally, the receiving unit 410 is specifically configured to: receiving Downlink Control Information (DCI), wherein the DCI comprises any one of the first PRG size and the second PRG size; and/or receiving radio resource control, RRC, signaling, the RRC including any one of the first PRG size and the second PRG size.

Optionally, the receiving unit 410 is further configured to: receiving at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI are/is used for indicating the first precoding matrix and the second TPMI is used for indicating the second precoding matrix.

Optionally, the receiving unit 410 is specifically configured to: receiving first DCI, the first DCI including the first PRG size and/or the second PRG size; receiving a second DCI comprising at least one of the first TPMI, the SRI, and the second TPMI; and the first DCI is used for indicating the time-frequency resource position occupied by the second DCI.

Optionally, the first TPMI comprises a first sub-TPMI and a second sub-TPMI, the first sub-TPMI is used for indicating a first basis vector group, the second sub-TPMI is used for selecting at least one basis vector from the first basis vector group, and the second DCI comprises the second sub-TPMI and/or the second TPMI.

Optionally, the receiving unit 410 is further configured to: receiving the first DCI, the first DCI including the first sub-TPMI.

Optionally, the receiving unit 410 is further configured to: receiving the first DCI, where the first DCI includes resource allocation information, and the resource allocation information is used to indicate resources allocated by the network device to the terminal device; the determining unit 420 is specifically configured to: determining the number of the first TPMI according to the resource allocation information and the first PRG size; and determining the number of the second TPMI according to the resource allocation information and the second PRG size.

It should be appreciated that the apparatus 400 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an optional example, it may be understood by those skilled in the art that the apparatus 400 may be specifically a terminal device in the foregoing embodiment, and the apparatus 400 may be configured to execute each procedure and/or step corresponding to the terminal device in the foregoing method embodiment, and in order to avoid repetition, details are not described here again.

Fig. 5 illustrates another data transmission apparatus 500 provided in the embodiment of the present application. The apparatus 500 includes a processor 510, a transceiver 520, and a memory 530. Wherein the processor 510, the transceiver 520 and the memory 530 are in communication with each other via an internal connection path, the memory 530 is configured to store instructions, and the processor 510 is configured to execute the instructions stored in the memory 530 to control the transceiver 520 to transmit and/or receive signals.

The processor 510 is configured to determine a first precoding resource block group PRG size, where the first PRG size is used to indicate a number of physical resource blocks PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, where the first precoding matrix is a precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device, and each antenna port group in the at least two antenna port groups includes at least two antenna ports;

the processor 510 is further configured to determine a second PRG size, where the second PRG size is used to indicate a number of PRBs that use a same second precoding matrix and are continuously distributed in a frequency domain, and the second precoding matrix includes a phase difference between first precoding matrices of any two antenna port groups of the at least two antenna port groups;

the transceiver 520 is configured to signal the first PRG size and the second PRG size.

It should be understood that the apparatus 500 may be embodied as a network device in the foregoing embodiments, and may be used to execute each step and/or flow corresponding to the network device in the foregoing method embodiments. Alternatively, the memory 530 may include a read-only memory and a random access memory, and provide instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 510 may be configured to execute instructions stored in the memory, and when the processor 510 executes the instructions stored in the memory, the processor 510 is configured to perform the various steps and/or processes of the method embodiments described above in connection with the network device.

Fig. 6 shows another data transmission apparatus 600 provided in the embodiment of the present application. The apparatus 600 includes a processor 610, a transceiver 620, and a memory 630. Wherein the processor 610, the transceiver 620 and the memory 630 are in communication with each other through an internal connection path, the memory 630 is used for storing instructions, and the processor 610 is used for executing the instructions stored in the memory 630 to control the transceiver 620 to transmit and/or receive signals.

The transceiver 620 is configured to receive a first precoding resource block group PRG size and a second PRG size, where the first PRG size is used to indicate the number of PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, the first precoding matrix is a precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device, each antenna port group in the at least two antenna port groups includes at least two antenna ports, the second PRG size is used to indicate the number of PRBs that use a same second precoding matrix and are continuously distributed in the frequency domain, and the second precoding matrix includes a phase difference between the first precoding matrices of any two antenna port groups in the at least two antenna port groups;

the processor 610 is configured to determine a precoding matrix adopted by the terminal device on each PRB according to the first PRG size and the second PRG size.

It should be understood that the apparatus 600 may be embodied as the terminal device in the foregoing embodiment, and may be configured to execute each step and/or flow corresponding to the terminal device in the foregoing method embodiment. Alternatively, the memory 630 may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 610 may be configured to execute instructions stored in the memory, and when the processor 610 executes the instructions stored in the memory, the processor 610 is configured to perform the steps and/or processes of the method embodiments corresponding to the terminal device described above.

It should be understood that in the embodiment of the present application, the processor of the above apparatus may be a Central Processing Unit (CPU), and the processor may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory, in combination with hardware thereof, to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

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

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, comprising:

the method comprises the steps that network equipment determines the size of a first precoding resource block group (PRG) for uplink data transmission, wherein the first PRG is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain, the first precoding matrix is the precoding matrix of any one antenna port group in at least two antenna port groups of terminal equipment, and each antenna port group in the at least two antenna port groups comprises at least two antenna ports;

the network equipment determines a second PRG size for uplink data transmission, wherein the second PRG size is used for indicating the number of PRBs which use the same second precoding matrix and are continuously distributed on a frequency domain, and the second precoding matrix comprises a phase difference between first precoding matrices of any two antenna port groups in the at least two antenna port groups;

the network device signaling the first PRG size and the second PRG size.

2. The method of claim 1, wherein the network device signals the first PRG size and the second PRG size, comprising:

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. The method of claim 3, wherein the network device signals the first PRG size and the second PRG size, comprising:

and the first DCI is used for indicating the time-frequency resource position occupied by the second DCI.

5. The method according to claim 4, wherein the sum of the number of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or

6. The method according to claim 4 or 5, wherein the first TPMI comprises a first sub-TPMI for indicating a first set of basis vectors and a second sub-TPMI for selecting at least one basis vector from the first set of basis vectors,

and the network equipment transmits the second sub TPMI and/or the second TPMI to the terminal equipment through the second DCI.

7. The method of claim 6, further comprising:

8. A method of data transmission, comprising:

the method comprises the steps that terminal equipment receives a first precoding resource block group PRG size and a second PRG size which are used for uplink data transmission, wherein the first PRG size is used for indicating the number of PRBs (physical resource blocks) which use the same first precoding matrix and are continuously distributed on a frequency domain, the first precoding matrix is the precoding matrix of any one antenna port group in at least two antenna port groups of the terminal equipment, each antenna port group in the at least two antenna port groups comprises at least two antenna ports, the second PRG size is used for indicating the number of PRBs which use the same second precoding matrix and are continuously distributed on the frequency domain, and the second precoding matrix comprises a phase difference between the first precoding matrices of any two antenna port groups in the at least two antenna port groups;

and the terminal equipment determines a precoding matrix adopted by the terminal equipment on each PRB according to the first PRG size and the second PRG size.

9. The method of claim 8, wherein the terminal device receiving the first precoding resource block group PRG size and the second PRG size comprises:

10. The method according to claim 8 or 9, characterized in that the method further comprises:

the terminal equipment receives at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI are used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

11. The method of claim 10, wherein the terminal device receiving the first precoding resource block group PRG size and the second PRG size comprises:

the terminal equipment receives second DCI, wherein the second DCI comprises at least one of the first TPMI, the SRI and the second TPMI;

12. The method according to claim 11, wherein the sum of the number of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or

13. The method according to claim 11 or 12, wherein the first TPMI comprises a first sub-TPMI for indicating a first group of basis vectors and a second sub-TPMI for selecting at least one basis vector from the first group of basis vectors, and the second DCI comprises the second sub-TPMI and/or the second TPMI.

14. The method of claim 13, further comprising:

the terminal device receives the first DCI, which includes the first sub-TPMI.

15. The method of claim 11, further comprising:

the terminal equipment receives the first DCI, wherein the first DCI comprises resource allocation information, and the resource allocation information is used for indicating resources allocated to the terminal equipment by network equipment;

16. A data transmission apparatus, comprising:

a first determining unit, configured to determine a first precoding resource block group PRG size for uplink data transmission, where the first PRG size is used to indicate a number of physical resource blocks PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, where the first precoding matrix is a precoding matrix of any one antenna port group of at least two antenna port groups of a terminal device, and each antenna port group of the at least two antenna port groups includes at least two antenna ports;

a second determining unit, configured to determine a second PRG size for uplink data transmission, where the second PRG size is used to indicate a number of PRBs that use a same second precoding matrix and are continuously distributed in a frequency domain, and the second precoding matrix includes a phase difference between first precoding matrices of any two antenna port groups of the at least two antenna port groups;

a sending unit, configured to send the first PRG size and the second PRG size through signaling.

17. The apparatus according to claim 16, wherein the sending unit is specifically configured to:

transmitting the first PRG size through any one of Downlink Control Information (DCI) and Radio Resource Control (RRC) signaling; and/or

Transmitting the second PRG size through any one of DCI and RRC signaling.

18. The apparatus according to claim 16 or 17, wherein the sending unit is further configured to:

signaling at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI is used for indicating the first precoding matrix, and the second TPMI is used for indicating the second precoding matrix.

19. The apparatus according to claim 18, wherein the sending unit is specifically configured to:

transmitting the first PRG size and/or the second PRG size to the terminal device through first DCI;

transmitting at least one of the first TPMI, the SRI and the second TPMI to the terminal device through a second DCI;

20. The apparatus of claim 19, wherein a sum of the number of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or

21. The apparatus according to claim 19 or 20, wherein the first TPMI comprises a first sub-TPMI for indicating a first set of basis vectors and a second sub-TPMI for selecting at least one basis vector from the first set of basis vectors,

the sending unit is specifically configured to:

and transmitting the second sub TPMI and/or the second TPMI to the terminal equipment through the second DCI.

22. The apparatus of claim 21, wherein the sending unit is further configured to:

and transmitting the first sub TPMI to the terminal equipment through the first DCI.

23. A data transmission apparatus, comprising:

a receiving unit, configured to receive a first precoding resource block group PRG size and a second PRG size for uplink data transmission, where the first PRG size is used to indicate a number of PRBs that use a same first precoding matrix and are continuously distributed in a frequency domain, the first precoding matrix is a precoding matrix of any one antenna port group in at least two antenna port groups of a terminal device, each antenna port group in the at least two antenna port groups includes at least two antenna ports, the second PRG size is used to indicate a number of PRBs that use a same second precoding matrix and are continuously distributed in the frequency domain, and the second precoding matrix includes a phase difference between the first precoding matrices of any two antenna port groups in the at least two antenna port groups;

a determining unit, configured to determine, according to the first PRG size and the second PRG size, a precoding matrix adopted by the terminal device on each PRB.

24. The apparatus according to claim 23, wherein the receiving unit is specifically configured to:

receiving Downlink Control Information (DCI), wherein the DCI comprises any one of the first PRG size and the second PRG size; and/or

Receiving radio resource control, RRC, signaling, the RRC including any one of the first PRG size and the second PRG size.

25. The apparatus according to claim 23 or 24, wherein the receiving unit is further configured to:

receiving at least one of a first Transmission Precoding Matrix Indication (TPMI), a reference Signal Resource Indication (SRI) and a second TPMI, wherein the first TPMI and/or the SRI are/is used for indicating the first precoding matrix and the second TPMI is used for indicating the second precoding matrix.

26. The apparatus according to claim 25, wherein the receiving unit is specifically configured to:

receiving first DCI, the first DCI including the first PRG size and/or the second PRG size;

receiving a second DCI comprising at least one of the first TPMI, the SRI, and the second TPMI;

27. The apparatus of claim 26, wherein a sum of bits occupied by the first TPMI and the second TPMI in the second DCI is a preset fixed value; or

28. The apparatus according to claim 26 or 27, wherein the first TPMI comprises a first sub-TPMI for indicating a first group of basis vectors and a second sub-TPMI for selecting at least one basis vector from the first group of basis vectors, and the second DCI comprises the second sub-TPMI and/or the second TPMI.

29. The apparatus of claim 28, wherein the receiving unit is further configured to:

receiving the first DCI, the first DCI including the first sub-TPMI.

30. The apparatus of claim 26, wherein the receiving unit is further configured to:

receiving the first DCI, where the first DCI includes resource allocation information, and the resource allocation information is used to indicate resources allocated by a network device to the terminal device;

the determining unit is specifically configured to:

determining the number of the first TPMI according to the resource allocation information and the first PRG size;

and determining the number of the second TPMI according to the resource allocation information and the second PRG size.