CN112602269B

CN112602269B - Precoding indication method for uplink data transmission and related equipment

Info

Publication number: CN112602269B
Application number: CN201880096836.2A
Authority: CN
Inventors: 苏立焱
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2021-11-09
Anticipated expiration: 2038-11-02
Also published as: WO2020087536A1; CN112602269A

Abstract

The embodiment of the application provides a precoding indication method for uplink data transmission and related equipment, and the method comprises the following steps: receiving precoding indication information sent by network equipment, wherein the precoding indication information comprises grouping information of a secondary precoding resource block group (PRG) and a precoding data segment; and sending uplink data, wherein the precoding of each secondary PRG is determined according to the grouping information of the secondary PRG and the precoded data segment. By implementing the embodiment of the application, the precoding indication precision can be improved.

Description

Precoding indication method for uplink data transmission and related equipment

Technical Field

The present application relates to the field of wireless network technologies, and in particular, to a precoding indication method for uplink data transmission and a related device.

Background

In Long Term Evolution (LTE) and New Radio (NR) systems, a change of a multi-user multi-input multi-output (MU-MIMO) paired user has a large influence on precoding; the channel frequency selection has a small but not negligible effect on precoding. Conversely, the precoding correlation within the bandwidth of the same user pair is large; the precoding correlation of different user pairs is small or even zero. From the perspective of information theory, the larger the correlation between a group of information, the more space for compressing the information, i.e. the information can be compressed into smaller information. Therefore, it is necessary to design a compressed precoding indication scheme to notify a User Equipment (UE) of precoding (also called precoding matrix) with as few bits as possible. In the prior art scheme, the base station and the UE predefine the granularity of two frequency domain resources together: a primary physical resource block (PRG) and a secondary PRG, but the division of the primary PRG is fixed, and the grouping manner of the secondary PRG and the primary PRG cannot be modified according to a specific scheduling scheme in different Transmission Time Intervals (TTIs), so that the indication accuracy of precoding is insufficient.

Disclosure of Invention

The application provides a precoding indication method for uplink data transmission and related equipment, which can improve precoding indication precision.

In a first aspect, an embodiment of the present application provides a precoding indication method, including: firstly, receiving precoding indication information sent by network equipment, wherein the precoding indication information comprises grouping information of a secondary precoding resource block group (PRG) and a precoding data segment; and then sending uplink data, and determining the precoding of each secondary PRG according to the grouping information of the secondary PRG and the precoded data segment, namely the precoding used in uplink data transmission on each secondary PRG. Because the primary PRG can be dynamically divided according to the grouping information of the secondary PRG, the grouping modes of the secondary PRG and the primary PRG can be modified according to a specific scheduling scheme in different TTIs, thereby improving the indication precision of precoding.

In one possible design, the primary PRG to which each secondary PRG belongs may be determined based on the grouping information of the secondary PRGs, and then the secondary PRGs may be classified into two categories based on predefined or signaled classification rules. Determining the precoding of the first class of secondary PRG according to the precoding of the primary PRG to which the first class of secondary PRG belongs; determining the precoding of the second class of secondary PRG according to the precoding of the primary PRG to which the second class of secondary PRG belongs and the differential precoding of the corresponding secondary PRG; wherein the precoding of the primary PRG and the differential precoding of the secondary PRG are included in the precoded data segment.

In another possible design, the number of primary PRGs of the first type included in each of the primary PRGs does not exceed one.

In another possible design, the first type of secondary PRG included in each of the primary PRGs is located at a center position in a frequency domain of the primary PRG, that is, the first type of secondary PRG is (one of) a maximum distance minimum secondary PRG from all secondary PRGs included in the corresponding primary PRG. Therefore, the difference between the precoding of the plurality of secondary PRGs in the primary PRG group and the precoding of the primary PRG is ensured to be as small as possible, and the accurate feedback of differential precoding is facilitated.

In another possible design, a certain amount of redundancy in PI may be allowed, and other bits in the precoded data segment besides the precoding of the primary PRG and the differential precoding of the secondary PRG may be 0, which is beneficial for reducing the number of bits indicating PI payload size in DCI.

In another possible design, the pre-coded data segment does not have any redundant information, so that the bit number occupied by notifying the PI can be saved, and the signaling overhead of the physical layer is reduced.

In another possible design, downlink control information DCI and a physical downlink shared channel PDSCH sent by a network device may be received, where the DCI includes a load size of precoding indication information, and the precoding indication information may be obtained from the PDSCH according to the load size of the precoding indication information.

In another possible design, since the packet information of the secondary PRG is carried on the PDSCH together with the precoded data segment, the packet information and the precoded data segment of the secondary PRG need to be separated. The precoding indication information may be divided according to the load size of the precoding indication information and the load size of the packet information of the secondary PRG to obtain the packet information and the precoded data segment of the secondary PRG.

In another possible design, the load size of the packet information of the secondary PRG may be determined according to the resource allocation indication information carried in the DCI, so as to save the number of bits occupied by the notification PI and reduce the overhead of the physical layer signaling.

In another possible design, the load size of the packet information of the secondary PRG may also be predefined, and this way, for any bandwidth allocated by the gNB, the processing manner of the UE is consistent, which is convenient for the UE to implement.

In another possible design, DCI and a PDSCH transmitted by a network device may be received, where the DCI includes a load size of packet information of a secondary PRG, the packet information of the secondary PRG may be obtained from the PDSCH according to the load size of the packet information of the secondary PRG, then a load size of a precoded data segment is calculated according to the packet information of the secondary PRG, and the precoded data segment is obtained from the PDSCH according to the load size of the precoded data segment.

In another possible design, DCI and a PDSCH transmitted by a network device may be received, where the DCI includes grouping information of a secondary PRG and the PDSCH includes a precoded data segment.

In another possible design, the load size of the precoded data segment may be determined according to the grouping information of the secondary PRG, and then the precoded data segment may be acquired from the PDSCH according to the load size of the precoded data segment.

In another possible design, the DCI may be carried in a control channel (e.g., PDCCH or other physical layer control channel). Alternatively, the DCI may also be preconfigured by a higher layer signaling (e.g., RRC common or dedicated signaling), and the specific transmission method of the scheduling information is not limited in this embodiment of the present application.

In a second aspect, an embodiment of the present application provides a precoding indication apparatus for uplink data transmission, where the uplink data transmission is configured to implement the method and the function performed by the terminal device in the first aspect, and is implemented by hardware/software, where the hardware/software includes units corresponding to the functions.

In a third aspect, an embodiment of the present application provides a terminal device, including: the uplink data transmission precoding indication method comprises a processor, a memory and a communication bus, wherein the communication bus is used for realizing connection communication between the processor and the memory, and the processor executes a program stored in the memory for realizing the steps in the uplink data transmission precoding indication method provided by the first aspect.

In one possible design, the terminal device provided in the embodiment of the present application may include a module for performing the corresponding behavior of the uplink data sending apparatus in the above method design. The modules may be software and/or hardware.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored therein instructions, which, when executed on a computer, cause the computer to perform the methods of the above-mentioned aspects.

In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a communication system 100 according to an embodiment of the present application;

fig. 2 is a schematic diagram of an LTE time-frequency resource provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of an open loop system provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a closed loop system provided by an embodiment of the present application;

fig. 5 is a schematic diagram of omni-directional transmission and directional transmission provided in an embodiment of the present application;

fig. 6 is a schematic diagram illustrating multiplexing of downlink data and uplink channel information according to an embodiment of the present application;

fig. 7 is a schematic diagram of selecting precoding provided in an embodiment of the present application;

fig. 8 is a schematic diagram of an optimal precoding direction of an MU-MIMO paired user to an expected user according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of interference alignment provided by an embodiment of the present application;

fig. 10 is a schematic diagram of a precoding indication provided in an embodiment of the present application;

fig. 11 is a flowchart illustrating a method for indicating precoding for uplink data transmission according to an embodiment of the present application;

fig. 12 is a diagram of another precoding indication provided in an embodiment of the present application;

fig. 13 is a diagram of a precoded data segment according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a precoding indicating apparatus for uplink data transmission according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a terminal device proposed in the present application.

Detailed Description

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

As shown in fig. 1, fig. 1 is a schematic architecture diagram of a communication system 100 according to an embodiment of the present disclosure. The communication system 100 may include a network device 110 and terminal devices 101 to 106. It should be understood that more or fewer network devices or terminal devices may be included in the communication system 100 to which the methods of the embodiments of the present application may be applied. The network device or the terminal device may be hardware, or may be functionally divided software, or a combination of the two. The network device and the terminal device can communicate through other devices or network elements. In the communication system 100, the network device 110 can transmit downlink data to the terminal devices 101 to 106. Of course, terminal apparatuses 101 to 106 may transmit uplink data to network apparatus 110. Terminal devices 101-106 may be cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, Personal Digital Assistants (PDAs), and/or any other suitable device for communicating over wireless communication system 100, among others. The communication system 100 may employ a Public Land Mobile Network (PLMN), a device-to-device (D2D) network, a machine-to-machine (M2M) network, an internet of things (IoT), or other networks. The terminal devices 104 to 106 may form a communication system. In the communication system, the terminal device 105 may transmit downlink data to the terminal device 104 or the terminal device 106. The method in the embodiment of the present application may be applied to the communication system 100 shown in fig. 1.

In LTE and NR systems, uplink data is transmitted based on Orthogonal Frequency Division Multiple Access (OFDMA) or single carrier-frequency division multiple access (SC-FDMA), time-frequency resources are divided into OFDM or SC-FDMA symbols (hereinafter referred to as time-domain symbols) in the time-domain dimension and subcarriers in the frequency-domain dimension, and the minimum resource granularity is one Resource Element (RE), i.e., a time-frequency lattice point representing a combination of one time-domain symbol in the time domain and one subcarrier in the frequency domain. A typical time-frequency resource basic structure is a subcarrier interval of 15KHz, a time domain symbol duration of about 70us, and a cyclic prefix duration of about 4-6 us, where each subframe (1ms) contains 14 symbols. As shown in fig. 2, fig. 2 is a schematic diagram of an LTE time-frequency resource provided in the embodiment of the present application. The LTE time-frequency resource includes a plurality of RBs, each RB containing 12 subcarriers and 7 OFDM symbols.

In LTE and some NR systems, the UE performs uplink data transmission based on base station scheduling. For convenience of scheduling, a large data packet of an upper layer of the UE is divided into small data packets in units of transport blocks to wait for scheduling by the base station in the process of transmitting the large data packet downwards to the physical layer. The basic unit of time scheduled by the base station at a time is typically one subframe or one TTI. The specific scheduling process comprises the following steps: a base station transmits Downlink Control Information (DCI) on a control channel (e.g., a Physical Downlink Control Channel (PDCCH)), where the DCI is also called an uplink grant (UL grant) and indicates scheduling information corresponding to a Transport Block (TB) in a physical downlink shared channel (PUSCH), and the scheduling information includes control information such as precoding used for uplink transmission, frequency/time-frequency domain resources used by a scheduled TB, and Modulation and Coding Scheme (MCS) index. The precoding is an important component in MIMO technology, and is mainly described below.

As shown in fig. 3, fig. 3 is a schematic diagram of an open-loop system according to an embodiment of the present disclosure. The open-loop system is a basic system without precoding, only a single link exists between a transmitting end and a receiving end, and a closed loop does not exist. In the open-loop system, a demodulation reference signal (DMRS) is a signal known to both the UE and the gNB and is used for uplink channel estimation at the base station side. The gNB only indicates the time-frequency resources used by transmission for the UE, and does not feed back any information related to the uplink channel to the UE to assist the UE in uplink data transmission. Therefore, in the open-loop system, the UE does not know any channel information from the UE to the gNB, and can only transmit uplink data omnidirectionally, which causes a certain energy waste.

As shown in fig. 4, fig. 4 is a schematic diagram of a closed-loop system provided in an embodiment of the present application. In a closed-loop system, there is not only an uplink data transmission link from the transmitting end to the receiving end, but also a feedback link from the receiving end to the transmitting end. Before the UE sends uplink data to the base station, the UE sends a channel Sounding Reference Signal (SRS) to the base station for uplink channel estimation of the base station. After receiving the SRS, the base station determines precoding used by the UE according to the estimated uplink channel, and sends a Precoding Matrix Indication (PMI) to the UE. In this way, the UE can correct uplink data transmission according to the precoding indicated by the PMI, and purposefully transmit uplink data to the base station (directional transmission), thereby enhancing the received signal energy of the base station. As shown in fig. 5, fig. 5 is a schematic diagram of omni-directional transmission and directional transmission provided in an embodiment of the present application. Therefore, when the feedback of the uplink channel is accurate, the performance of the closed-loop system is superior to that of the open-loop system, and the embodiment of the application provides a Precoding Indicator (PI) scheme based on the closed-loop system.

The PI may be carried on the DCI or the PDSCH, and when the PI is carried on the DCI, the load of the PI is small, and the corresponding accuracy is also low, and in some special scenarios (e.g., interference alignment), the low-accuracy PI is not sufficient to meet the technical requirement of interference alignment, so the PI may be carried on the PDSCH. For example, as shown in fig. 6, fig. 6 is a schematic diagram illustrating multiplexing of downlink data and uplink channel information according to an embodiment of the present application. The PI and the downlink data are cascaded together and sent to the UE after the steps of coding modulation and the like. Correspondingly, after the steps of demodulation, decoding and the like, the UE analyzes the cascade of the PI and the downlink data, and then separates the PI from the PDSCH by using the amount of PI information (such as load size, which can be obtained from the PDCCH) acquired by other approaches. The operation and principle of the closed-loop system are described above by taking narrow-band single-user MIMO (SU-MIMO) as an example, and the actual system is generally broadband and multi-purpose. The following describes the effect of wideband and multi-user MIMO (MU-MIMO) on precoding.

For a narrowband system (e.g., 1 RB in frequency domain bandwidth), the channel over the full frequency band may be considered approximately the same. In this case, the precoding used at different frequency points may be considered to be the same. However, for a wideband system, the frequency domain may be as wide as several tens of RBs, in which case, several RBs may be divided into one PRG according to the approximation degree of the channel, and the channels within the PRG are considered to be approximately the same and have the same precoding. The channels are different between PRGs and the precoding is different, but this does not mean that the precoding is necessarily different between different PRGs. As shown in fig. 7, fig. 7 is a schematic diagram of selecting precoding provided in an embodiment of the present application. Although the channel is different between PRGs, the precoding of PRG1 is the same as that of PRG 2. If the precoding is different between the PRGs, the UE needs to be informed after the precoding on each PRG is distinguished, which increases the PI overhead.

As shown in fig. 8, fig. 8 is a schematic diagram of an optimal precoding direction of an MU-MIMO paired user to an expected user according to an embodiment of the present application. For SU-MIMO systems, the gNB is generally based on a criterion of maximizing received signal power (corresponding to data transmitted uplink by the UE) when designing UE precoding; however, for MU-MIMO, the design criteria not only consider the received signal power of each UE, but also consider the problem of mutual interference between the received signals of multiple users, resulting in that the optimal precoding in multi-user is usually different from the optimal precoding of single user and is related to the UEs participating in multiplexing. Therefore, once the paired users participating in MU-MIMO change, it is expected that the users will also change precoding accordingly to achieve optimal uplink transmission.

It should be understood that when the uplink interference alignment technique is applied to the communication system, the precoding and the paired users are more closely related, and even if several users are multiplexed, only one of the multiplexed users is replaced, the precoding of the desired user will be greatly different. As shown in fig. 9, fig. 9 is a schematic diagram of interference alignment provided in an embodiment of the present application. 3 eNB-UE pairs (3 cells, 1 UE in each cell), each eNB expects to receive the signal of the corresponding UE. Each eNB includes 2 receive ports and each UE includes 2 transmit ports, and the UE transmits 1-stream uplink data (one vector in the figure). Since each eNB has only 2 antenna ports, only two streams of data can be distinguished. Similarly on a two-dimensional plane, only 2 vectors can be distinguished, depending on the sum of the vectors and the respective directions of the vectors. Under a conventional space division orthogonal system, the system only allows 2 of 3 UEs to transmit, and uplink transmission at the time is interference-free. However, in the interference alignment technique, the beam directions of all UEs are jointly designed, so that the interference received by the eNB is superimposed in the same subspace, and then the desired signal is received on the null space of the subspace. At this time, 3 UEs may simultaneously transmit uplink data for a total of 3 stream data. Therefore, compared with space division orthogonality of multiple UEs, the utilization rate of space resources can be improved by 50% by utilizing an interference alignment technology.

In summary, the change of the MU-MIMO paired users has a large influence on precoding; the channel frequency selection has a small but not negligible effect on precoding. Conversely, the precoding correlation within the bandwidth of the same user pair is large; the precoding correlation of different user pairs is small or even zero. From the perspective of information theory, the larger the correlation between a group of information, the more space for compressing the information, i.e. the information can be compressed into smaller information. Therefore, a compressed precoding indication scheme needs to be designed to inform the UE of precoding with as few bits as possible.

In order to solve the problem of large PI overhead in the wideband system, the SU-MIMO OFDM system may employ a differential precoding scheme. The eNB and the UE predefine the granularity of two frequency domain resources, namely a primary PRG and a secondary PRG, wherein the primary PRG comprises a plurality of secondary PRGs, and the secondary PRG comprises a plurality of RBs. The eNB and the UE stipulate that multiple RBs in the same secondary PRG use the same precoding, and that RBs belonging to different secondary PRGs use similar precoding in the same primary PRG. As shown in fig. 10, when notifying the UE of the precoding used, the eNB first notifies the precoding of each primary PRG, for example, the precoding of the ith primary PRG is

Because the information amount of the precoding is high, the required high quantization precision can be achieved only by using more bits for quantization, and the quantization bit number of each primary PRG precoding is recorded as X bits. For a plurality of secondary PRGs in the same primary PRG, except that one of the plurality of secondary PRGs may directly precode with the primary PRG, the other secondary PRGs need to inform the differential precoding thereof in a differential manner, for example, the differential precoding of the jth secondary PRG is

Because the information quantity of the differential precoding is low, the required high quantization precision can be achieved only by using less bits for quantization, the quantization bit number of each secondary PRG precoding is recorded as Ybits, and Y is less than or equal to X under the general condition. Therefore, the UE can know that all the RBs in the jth secondary PRG in the ith primary PRG use the precoding

For the secondary PRG directly precoded by the primary PRG, all the precodes used by all the RBs contained in the secondary PRG are all precoded

This helps to reduce the differential precoding indication information overhead (i.e., Ybits) of one secondary PRG.

In another embodiment, the UE may know that all RBs in the jth secondary PRG of the ith primary PRG use precoding

Where a. x B denotes a new matrix obtained by multiplying corresponding elements according to two matrices of the same size, e.g. [ a, B ]].*[c，d]＝[ac，bd]。

For example, as shown in fig. 10, the precoding matrix includes 4 secondary PRGs, where the first two constitute a primary PRG #1, the second two constitute a primary PRG #2, the precoding matrices of the four secondary PRGs are [ 11 ], [ 10.95 ], [ 1.10.8 ] and [ 1.20.9 ], the precoding matrices of the two primary PRGs are [ 11 ] and [ 1.10.8 ], and the differential precoding corresponding to the precoding matrices of the other two secondary PRGs are [ 11 ] - [ 10.95 ] - [ 00.05 ] and [ 1.10.8 ] - [ 1.20.9 ] - [ -0.1-0.1 ]. It can be seen that the primary PRG has a larger precoding value and therefore needs to be quantized with a larger number of bits, e.g. 8 bits, while the secondary PRG has a smaller differential precoding value and needs to be quantized with a smaller number of bits, e.g. 3 bits. Therefore, 22 bits (8+3+8+3) are needed for quantization in the 4 secondary PRGs, and 10 bits are saved compared with the common quantization (8 bits are needed for quantization in all the PRGs, and 32 bits are needed in all the PRGs).

Alternatively, in another embodiment, the differential precoding is [ 1/10.95/1 ] ═ 10.95 ] and [ 1.2/1.10.9/0.8 ] ═ 1.0911.125, respectively.

However, since the division of the primary PRG is fixed, the grouping manner of the secondary PRG and the primary PRG cannot be modified in different TTIs according to a specific scheduling scheme. For example, in a TTI, the network device schedules UE1 and UE2 for multiplexing on 1 st to 5 th secondary PRGs, and schedules UE1 and UE3 for multiplexing on 6 th to 8 th secondary PRGs, if the principle of dividing the secondary PRGs with similar precoding into one primary PRG is still maintained, the 1 st to 5 th secondary PRGs should be divided into one primary PRG, and the 6 th to 8 th secondary PRGs should be divided into another primary PRG. In another TTI, the scheduling is changed, the network device schedules UE1 and UE4 for multiplexing on the 1 st to 4 th secondary PRGs, schedules UE1 and UE5 for multiplexing on the 5 th to 8 th secondary PRGs, the 1 st to 4 th secondary PRGs should be divided into one primary PRG, and the 5 th to 8 th secondary PRGs should be divided into another primary PRG. However, due to the fact that the MU-MIMO system, especially the MU-MIMO system adopting interference cancellation, cannot effectively use differential precoding to indicate precoding of the UE, and thus precoding indication accuracy is not sufficient, because dynamic change of the primary PRG partitioning scheme cannot be supported. In order to solve the above technical problem, embodiments of the present application provide the following solutions.

Referring to fig. 11, fig. 11 is a flowchart illustrating a precoding indication method for uplink data transmission according to an embodiment of the present disclosure. As shown in the figures, the steps in the embodiment of the present application include:

s1101, receiving precoding indication information sent by a network device, wherein the precoding indication information includes grouping information of a secondary precoding resource block group (PRG) and a precoding data segment. Wherein the grouping information of the secondary PRG is used to determine the physical meaning corresponding to each bit in the precoded data segment. The method at least comprises the following optional modes:

in a first optional manner, the terminal device may receive downlink control information DCI and a physical downlink shared channel PDSCH sent by the network device, where the DCI includes a load size of the precoding indication information, and may obtain the precoding indication information from the PDSCH according to the load size of the precoding indication information. Where the DCI may be carried in a control channel (e.g., PDCCH or other physical layer control channel). Alternatively, the DCI may also be preconfigured by a higher layer signaling (e.g., RRC common or dedicated signaling), and the specific transmission method of the scheduling information is not limited in this embodiment of the present application.

Note that, in the embodiments of the present application, the bearer scheme of the PI in the PDSCH is not limited. The PI may be mapped to the PDSCH resource block after being concatenated with the downlink data through steps such as coding and modulation. Alternatively, the PI and the downlink data may be respectively mapped to respective predefined REs in the resource block after performing rate matching through steps such as code modulation and the like. After acquiring the load size (payload size) of the PI from the DCI, the UE acquires the load size (payload size) of the PI. Regardless of the above-described PI bearer scheme, the UE can separate the PI portion from the PDSCH. For example, when a cascade mode of PI and downlink data is adopted, the X bits PI information and the Y-X bits downlink data are cascaded together to form cascade information of Y bits, which is carried on the PDSCH, and after the UE parses the Y bits information, the first X bits in the Y bits is determined to be PI according to the load size X of the PI.

In the first alternative, since the packet information of the secondary PRG is carried on the PDSCH together with the precoded data segment, the packet information of the secondary PRG and the precoded data segment need to be separated. The precoding indication information may be divided according to a load size of the precoding indication information and a load size of the packet information of the secondary PRG to obtain the packet information of the secondary PRG and the precoded data segment.

Wherein the load size of the grouping information of the secondary PRG can be determined according to the resource allocation indication information carried in the DCI. In this case, when the gNB allocates a larger bandwidth to the UE, the load size of the packet information of the secondary PRG is also larger. For example: if the gNB allocates 10 secondary PRGs for the UE, the grouping information of the secondary PRGs is 30bits, each 3 bits of the 30bits are a group, 10 groups are provided, and the group information indicates which (at most 8) primary PRGs the secondary PRGs precode belongs to respectively. Therefore, the bit number occupied by the notification PI can be saved, and the signaling overhead of the physical layer is reduced.

Wherein, the load size of the packet information of the secondary PRG may also be predefined. Such as Z bits. In this case, after the UE receives the PI, the X bits PI may be divided into two parts, namely a Z bit and an X-Z bit, where the first part is packet information of the secondary PRG, and the second part is a precoded data segment. For any bandwidth allocated by the gNB, the processing modes of the UE are consistent, and the UE can conveniently realize the method.

In a second optional manner, the terminal device may receive DCI and a PDSCH transmitted by the network device, where the DCI includes the grouping information of the secondary PRG, and the PDSCH includes the precoded data segment. Where the DCI may be carried in a control channel (e.g., PDCCH or other physical layer control channel). Alternatively, the DCI may also be preconfigured by a higher layer signaling (e.g., RRC common or dedicated signaling), and the specific transmission method of the scheduling information is not limited in this embodiment of the present application.

Further, the load size of the precoded data segment may be determined according to the grouping information of the secondary PRG, and then the precoded data segment may be obtained from the PDSCH according to the load size of the precoded data segment. For example, the grouping information of the secondary PRGs is 000, 001, and 001, the first 4 secondary PRGs belong to the primary PRG #0, and the last 6 secondary PRGs belong to the primary PRG # 1. If the pre-coding bit number of the primary PRG is Lbits and the pre-coding bit number of the secondary PRG is M bits, the load size of the pre-coding data segment is 2L + 8M. And separating a precoded data segment from the PDSCH by using the load size 2L + 8M. For another example, an X bits pre-coding data segment and Y-X bits downlink data are concatenated together to form Ybits concatenation information, which is carried on the PDSCH, and after the UE parses the Ybits concatenation information, the UE determines the first X bits of the Y bits as a pre-coding data segment according to the load size of the pre-coding data segment.

In a third optional manner, DCI and a PDSCH transmitted by the network device may be received, where the DCI includes the load size of the packet information of the secondary PRG, the packet information of the secondary PRG may be obtained from the PDSCH according to the load size of the packet information of the secondary PRG, then the load size of the precoded data segment is obtained by calculation according to the packet information of the secondary PRG, and finally the precoded data segment is obtained from the PDSCH according to the load size of the precoded data segment. Please refer to the above two methods for obtaining the specific method.

S1102, sending uplink data, and determining precoding of each secondary PRG according to the grouping information of the secondary PRGs and the precoded data segment. The precoding of each secondary PRG is the precoding used in uplink data transmission on each secondary PRG.

In a specific implementation, the primary PRG to which each secondary PRG belongs may be determined according to the grouping information of the secondary PRGs, and then the secondary PRGs may be classified into two classes according to a predefined or signaled classification rule. And determining the pre-coding of the first class of secondary PRG according to the pre-coding of the primary PRG to which the first class of secondary PRG belongs, and determining the pre-coding of the second class of secondary PRG according to the pre-coding of the primary PRG to which the second class of secondary PRG belongs and the differential pre-coding of the corresponding secondary PRG. Wherein the precoding of the primary PRG and the differential precoding of the secondary PRG are included in the precoded data segment.

For example, the ith primary PRG is precoded as

Differential precoding of the jth secondary PRG into

In one possible design, the terminal device may know that the precoding of the first-class secondary PRG is the same as the precoding of the primary PRG, i.e., the ith primary PRThe precoding of the first type of secondary PRG in G may be

The precoding of the second type of secondary PRG is the sum, or dot-product, of the precoding of the primary PRG and the differential precoding of the secondary PRG, i.e., the precoding of the second type of secondary PRG used by all RBs within the jth secondary PRG in the ith primary PRG may be

In another embodiment, the precoding of the second type of secondary PRG used by all RBs within the jth secondary PRG in the ith primary PRG may be

The other steps are the same as in the above scheme, where a. times.b denotes a new matrix, e.g. [ a, B ], obtained by multiplying corresponding elements according to two matrices of the same size].*[c，d]＝[ac，bd]。

Optionally, the number of the first type secondary PRGs included in each of the primary PRGs is not more than one.

As another example, as shown in fig. 12, fig. 12 is a schematic diagram of a precoding indication provided in an embodiment of the present application. The terminal equipment receives the PI of the Xbits, and the PI comprises grouping information of a secondary PRG of the Z bits and a precoding data section of the X-Z bits. Wherein the grouping information of the secondary PRG is 000, 001, and 001. And the terminal equipment determines the grouping situation of the primary PRG according to the grouping information of the secondary PRG. As can be seen from the grouping information of the secondary PRGs, the precodes of the first four secondary PRGs belong to the primary PRG #0, the precodes of the last 6 secondary PRGs belong to the primary PRG #1, and the total bandwidth is divided into 2 primary PRGs. In addition, the terminal device and the network device define the number of bits for quantizing the precoding of each primary PRG to be L and the number of bits for quantizing the differential precoding of each secondary PRG to be M in advance. According to the predefined rule, the terminal device interprets the pre-coded data segment of the X-Z bits as follows:

the first L bits represents the precoding of the primary PRG # 0; the next 3M bits represents the differential precoding of the 4 secondary PRGs belonging to the primary PRG #0 (the 4 secondary PRGs have only 3 differences, where the precoding of one secondary PRG directly uses the precoding of the primary PRG), and the differential precoding of each secondary PRG is M bits, arranged in sequence. Then the next L bits represents the precoding of the primary PRG # 1; next, 5M bits represents differential precoding of 6 secondary PRGs belonging to the primary PRG #1, and the differential precoding of each secondary PRG is M bits, which are arranged in sequence. And finally, the residual X-Z-2L-8M bits are virtual check bits.

Optionally, for the first optional manner, when the load size of the PI is notified to the terminal device by the DCI, the virtual parity bit X-Z-2L-8M is greater than or equal to 0, a certain amount of redundancy may be allowed in the PI, and other bits in the precoded data segment except for the precoding of the primary PRG and the differential precoding of the secondary PRG may be 0, which is beneficial to reducing the bit number indicating the PI payload size in the DCI. For example, if the useful information in the PI could be every value in 1000 ~ 2000, if redundant information in the PI is not allowed, the DCI needs the ability to accurately inform every value in 1000 ~ 2000 (the UE must have accurate PI payload size information to distinguish between PI and other downlink information), so 10bit information is needed (2 bit information)¹⁰1024). Conversely, if there may be redundant information in the PI that does not exceed 100 bits, the DCI only needs to notify the PI that the first load size is a certain value of 1000, 1100, 1200⁴16). Compared with the prior art, the method reduces the load size of the 6-bit DCI, and is beneficial to improving the transmission reliability of the DCI.

Of course, for the first alternative, the dummy parity bit X-Z-2L-8M is 0, i.e. there is no spare bit in the precoded data segment. Therefore, the bit number occupied by informing the PI can be saved, and the signaling overhead of the physical layer is reduced. For the second optional manner, since the DCI carries the grouping information of the secondary PRG, the terminal device may accurately determine the load size of the precoded data segment according to the grouping information of the secondary PRG, so that there is no redundant information in the precoded data segment.

Optionally, the first type secondary PRG included in each of the primary PRGs is located at a center position of the frequency domain of the primary PRG. As shown in fig. 13, fig. 13 is a schematic diagram of a precoded data segment according to an embodiment of the present application. The precoded data segment includes two primary PRGs, primary PRG #1 and primary PRG # 2. Wherein the primary PRG #1 includes precoding of 5 secondary PRGs, the first type of secondary PRG is located at a third position of the frequency domain of the primary PRG #1, and the precoding of the first type of secondary PRG is the same as the precoding of the primary PRG. The precoding of the secondary PRG of the second class in the primary PRG #1 is then determined from the precoding of the primary PRG and the differential precoding of the secondary PRGs at the other four locations. Thus, the difference between the precoding of the plurality of secondary PRGs in the primary PRG #1 and the precoding of the primary PRG can be ensured to be as small as possible, which is beneficial to the accurate feedback of the differential precoding.

In the embodiment of the application, precoding indication information sent by a network device is received first, wherein the precoding indication information includes grouping information of a secondary PRG and a precoded data segment, precoding of the secondary PRG is determined according to the grouping information of the secondary PRG and the precoded data segment, and finally the precoding of the secondary PRG transmits uplink data. Because the primary PRG can be dynamically divided according to the grouping information of the secondary PRG, the grouping modes of the secondary PRG and the primary PRG can be modified according to a specific scheduling scheme in different TTIs, thereby improving the indication precision of precoding.

Referring to fig. 14, fig. 14 is a schematic structural diagram of a precoding indication apparatus for uplink data transmission according to an embodiment of the present disclosure. As shown in the figures, the apparatus in the embodiment of the present application includes:

a sending module 1401, configured to receive precoding indication information sent by a network device, where the precoding indication information includes grouping information of a secondary precoding resource block group PRG and a precoding data segment;

a receiving module 1402, configured to send uplink data, where precoding of each secondary PRG is determined according to grouping information of the secondary PRG and the precoded data segment.

The precoding of the first-class secondary PRG is determined according to the precoding of a main PRG to which the first-class secondary PRG belongs, and the precoding of the second-class secondary PRG is determined according to the precoding of the main PRG to which the second-class secondary PRG belongs and the differential precoding of the corresponding secondary PRG; wherein a primary PRG to which each secondary PRG belongs is determined by grouping information of the secondary PRG, and precoding of the primary PRG and differential precoding of the secondary PRG are included in the precoded data segment.

Wherein the number of the first type secondary PRGs included in each of the primary PRGs is not more than one.

Wherein the first type secondary PRG included in each of the primary PRGs is located at a frequency domain center position of the primary PRG.

Wherein the other bits of the precoded data segment except the precoding of the primary PRG and the differential precoding of the secondary PRG are 0.

Optionally, the receiving module 1401 is further configured to receive downlink control information DCI and a physical downlink shared channel PDSCH sent by the network device, where the DCI includes a first load size of the precoding indication information, and the precoding indication information is obtained from the PDSCH according to the first load size.

Wherein the grouping information of the secondary PRG and the precoded data segment are obtained by dividing the precoding indication information according to the first load size and a second load size of the grouping information of the secondary PRG, and the second load size is determined according to the resource allocation indication information carried in the DCI or predefined.

Optionally, the receiving module 1401 is further configured to receive DCI and a PDSCH transmitted by the network device, where the DCI includes a third load size of the packet information of the secondary PRG, the packet information of the secondary PRG is acquired from the PDSCH according to the third load size, the precoded data segment is acquired from the PDSCH according to a fourth load size, and the fourth load size is determined according to the packet information of the secondary PRG.

Optionally, the receiving module 1402 is further configured to receive DCI and a PDSCH sent by the network device, where the DCI includes the grouping information of the secondary PRG, and the PDSCH includes the precoded data segment.

The precoded data segment is obtained from the PDSCH according to a fifth load size of the precoded data segment, and the fifth load size is determined according to the grouping information of the secondary PRG.

It should be noted that, the implementation of each module may also correspond to the corresponding description of the method embodiment shown in fig. 11, and execute the method and the function executed by the terminal device in the foregoing embodiment.

Please refer to fig. 15, fig. 15 is a schematic structural diagram of a terminal device according to the present application. As shown in fig. 15, the terminal device may include: at least one processor 1501, at least one communication interface 1502, at least one memory 1503, and at least one communication bus 1504.

The processor 1501 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. The communication bus 1504 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 15, but this is not intended to represent only one bus or type of bus. A communication bus 1504 is used to enable connective communication between these components. In this embodiment, the communication interface 1502 of the device is used for performing signaling or data communication with other node devices. The memory 1503 may include a volatile memory, such as a nonvolatile dynamic random access memory (NVRAM), a phase change random access memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and the like, and may further include a nonvolatile memory, such as at least one magnetic disk memory device, an electrically erasable programmable read-only memory (EEPROM), a flash memory device, such as a NOR flash memory (NOR flash memory) or a NAND flash memory (EEPROM), and a semiconductor device, such as a Solid State Disk (SSD). Memory 1503 may optionally be at least one memory device located remotely from processor 1501 as previously described. A set of program code may optionally be stored in memory 1503 and the processor 1501 may optionally execute programs executed in memory 1503.

The communication interface 1502 receives precoding indication information sent by a network device, where the precoding indication information includes grouping information of a secondary precoding resource block group PRG and a precoded data segment;

the communication interface 1502 sends uplink data, and the precoding of each secondary PRG is determined according to the grouping information of the secondary PRG and the precoded data segment.

Wherein, the processor 1501 is further configured to perform the following operations:

receiving, by a communication interface 1502, downlink control information DCI and a physical downlink shared channel PDSCH sent by the network device, where the DCI includes a first load size of the precoding indication information, and the precoding indication information is obtained from the PDSCH according to the first load size.

receiving, by the communications interface 1502, the DCI and the PDSCH transmitted by the network device, where the DCI includes a third load size of the packet information of the secondary PRG, the packet information of the secondary PRG is obtained from the PDSCH according to the third load size, the precoded data segment is obtained from the PDSCH according to a fourth load size, and the fourth load size is determined according to the packet information of the secondary PRG.

receiving, by the network device, DCI and a PDSCH through the communication interface 1502, where the DCI includes the packet information of the secondary PRG, and the PDSCH includes the precoded data segment.

Further, the processor may cooperate with the memory and the communication interface to perform the operation of the uplink data transmitting apparatus in the above-mentioned embodiment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present application in detail. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precoding indication method for uplink data transmission, the method comprising:

receiving precoding indication information sent by network equipment, wherein the precoding indication information comprises grouping information of a secondary precoding resource block group (PRG) and a precoding data segment;

sending uplink data, wherein the precoding of each secondary PRG is determined according to the grouping information of the secondary PRG and the precoded data segment, the precoding of the first class of secondary PRG is determined according to the precoding of the main PRG to which the first class of secondary PRG belongs, and the precoding of the second class of secondary PRG is determined according to the precoding of the main PRG to which the second class of secondary PRG belongs and the differential precoding of the corresponding secondary PRG; wherein a primary PRG to which each secondary PRG belongs is determined by grouping information of the secondary PRG, and precoding of the primary PRG and differential precoding of the secondary PRG are included in the precoded data segment.

2. The method of claim 1, wherein no more than one of said primary PRGs contains a number of said primary PRGs.

3. The method of claim 1, wherein said first class of secondary PRGs included in each of said primary PRGs is located at a frequency domain center of said primary PRG.

4. The method of claim 1, wherein other bits of the precoded data segment other than the precoding of the primary PRG and the differential precoding of the secondary PRG are 0.

5. The method of any of claims 1-4, wherein the receiving precoding indication information sent by the network device comprises:

receiving Downlink Control Information (DCI) and a Physical Downlink Shared Channel (PDSCH) sent by the network equipment, wherein the DCI comprises a first load size of the precoding indication information, and the precoding indication information is acquired from the PDSCH according to the first load size.

6. The method of claim 5, wherein the grouping information of the secondary PRG and the precoded data segment are obtained by dividing the precoding indication information according to the first load size and a second load size of the grouping information of the secondary PRG, and the second load size is determined according to resource allocation indication information carried in the DCI or is predefined.

7. The method of any of claims 1-4, wherein the receiving precoding indication information sent by the network device comprises:

receiving the DCI and the PDSCH sent by the network device, wherein the DCI comprises a third load size of the grouping information of the secondary PRG, the grouping information of the secondary PRG is acquired from the PDSCH according to the third load size, the precoded data segment is acquired from the PDSCH according to a fourth load size, and the fourth load size is determined according to the grouping information of the secondary PRG.

8. The method of any of claims 1-4, wherein the receiving precoding indication information sent by the network device comprises:

receiving DCI and PDSCH transmitted by the network equipment, wherein the DCI comprises grouping information of the secondary PRG, and the PDSCH comprises the precoded data segment.

9. The method of claim 8, wherein the precoded data segment is obtained from the PDSCH according to a fifth load size of the precoded data segment, the fifth load size being determined according to grouping information of the secondary PRG.

10. An apparatus for indicating precoding for uplink data transmission, the apparatus comprising:

a sending module, configured to receive precoding indication information sent by a network device, where the precoding indication information includes grouping information of a secondary precoding resource block group PRG and a precoding data segment;

a receiving module, configured to send uplink data, where precoding of each secondary PRG is determined according to the grouping information of the secondary PRG and the precoded data segment, precoding of a first class of secondary PRGs is determined according to precoding of a primary PRG to which the first class of secondary PRGs belongs, and precoding of a second class of secondary PRGs is determined according to precoding of a primary PRG to which the second class of secondary PRGs belongs and differential precoding of a corresponding secondary PRG; wherein a primary PRG to which each secondary PRG belongs is determined by grouping information of the secondary PRG, and precoding of the primary PRG and differential precoding of the secondary PRG are included in the precoded data segment.

11. The apparatus of claim 10, wherein the number of said first type of secondary PRGs included in each of said primary PRGs is no more than one.

12. The apparatus of claim 10, wherein the primary PRG of the first type included in each of the primary PRGs is located at a frequency domain center position of the primary PRG.

13. The apparatus of claim 10, wherein other bits of the precoded data segment other than the precoding of the primary PRG and the differential precoding of the secondary PRG are 0.

14. The apparatus of any one of claims 10-13,

the receiving module is further configured to receive downlink control information DCI and a physical downlink shared channel PDSCH sent by the network device, where the DCI includes a first load size of the precoding indication information, and the precoding indication information is obtained from the PDSCH according to the first load size.

15. The apparatus of claim 14, wherein the grouping information of the secondary PRG and the precoded data segment are obtained by dividing the precoding indication information according to the first load size and a second load size of the grouping information of the secondary PRG, and wherein the second load size is determined according to resource allocation indication information carried in the DCI or is predefined.

16. The apparatus of any one of claims 10-13,

the receiving module is further configured to receive DCI and a PDSCH transmitted by the network device, where the DCI includes a third load size of the packet information of the secondary PRG, the packet information of the secondary PRG is obtained from the PDSCH according to the third load size, the precoded data segment is obtained from the PDSCH according to a fourth load size, and the fourth load size is determined according to the packet information of the secondary PRG.

17. The apparatus of any one of claims 10-13,

the receiving module is further configured to receive DCI and a PDSCH transmitted by the network device, where the DCI includes the grouping information of the secondary PRG, and the PDSCH includes the precoded data segment.

18. The apparatus of claim 17, wherein the precoded data segment is obtained from the PDSCH according to a fifth load size of the precoded data segment, the fifth load size being determined according to grouping information of the secondary PRG.

19. A terminal device, comprising: a memory for storing program code, a communication bus, and a processor for invoking the program code for performing the method of any one of claims 1-9.

20. A computer-readable storage medium having stored therein instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-9.