CN113783589B

CN113783589B - Transmission method of channel state information and related device

Info

Publication number: CN113783589B
Application number: CN202010526424.7A
Authority: CN
Inventors: 王晖; 葛士斌; 袁一凌; 金黄平; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2023-03-10
Anticipated expiration: 2040-06-09
Also published as: WO2021249026A1; CN113783589A

Abstract

The application provides a transmission method of channel state information and a related device. The method comprises the following steps: receiving P reference signals, wherein each reference signal is obtained by precoding based on a precoding vector corresponding to the reference signal, and P is more than 1; generating first indication information and second indication information, wherein the first indication information is used for indicating the number of the superposition coefficients with the nonzero median value in the P superposition coefficients corresponding to the P reference signals, and the second indication information is used for indicating the reference signals corresponding to the superposition coefficients with the nonzero median value, and the indication mode of the second indication information is associated with the number of the superposition coefficients with the nonzero median value; and sending the first indication information and the second indication information. Therefore, the user equipment can flexibly adopt an indication mode with lower cost according to the number of the superposition coefficients with the nonzero values, and the reference signals corresponding to the superposition coefficients with the nonzero values are indicated, so that the CSI coding cost is reduced.

Description

Transmission method of channel state information and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and a related apparatus for transmitting channel state information.

Background

The 5G communication system has higher requirements on system capacity, spectrum efficiency and the like. In a 5G communication system, a large-scale (massive) multiple antenna technology (MIMO) plays a crucial role in the spectral efficiency of the system. When the MIMO technology is adopted, modulation coding and signal precoding are required when the network device sends data to the user equipment. How the network device performs modulation coding and signal precoding needs to depend on Channel State Information (CSI) fed back to the network device by the user equipment.

The network device includes a plurality of antenna ports, and the network device transmits a reference signal to the user equipment through each of the plurality of antenna ports. The user equipment can obtain a plurality of superposition coefficients corresponding to the reference signal of the network equipment according to the reference signal. In the prior art, in the second Part (CSI-Part II) of the channel state information, the user equipment reports, through a bitmap (bitmap), which superposition coefficients are non-zero superposition coefficients that will be fed back to the network equipment. Each bit in the bit map corresponds to a superposition coefficient, and the value of each bit is used for indicating whether the corresponding superposition coefficient is a superposition coefficient with a nonzero value which can be fed back to the network equipment, so that the CSI coding cost is high due to the indication mode, and the uplink transmission code rate is high.

Disclosure of Invention

The embodiment of the application provides a transmission method and a related device of channel state information, which are beneficial to reducing the coding overhead of CSI (channel state information), so that the uplink transmission code rate is reduced.

In a first aspect, an embodiment of the present application provides a method for transmitting channel state information, including:

a method for transmitting channel state information, comprising:

receiving P reference signals, wherein each reference signal is obtained by precoding based on a precoding vector corresponding to the reference signal, and P is more than 1;

generating first indication information and second indication information, wherein the first indication information is used for indicating the number of superposition coefficients with a nonzero median value among P superposition coefficients corresponding to the P reference signals, the second indication information is used for indicating reference signals corresponding to the superposition coefficients with the nonzero median value, the indication mode of the second indication information is associated with the number of the superposition coefficients with the nonzero median value, and the superposition coefficients with the nonzero median value are used for weighting and combining precoding vectors corresponding to the corresponding reference signals to construct combined precoding vectors;

and sending the first indication information and the second indication information.

According to the technical scheme of the embodiment of the application, the indication mode of the reference signal corresponding to the superposition coefficient with the non-zero indication value is associated with the number of the superposition coefficients with the non-zero indication value. Compared with an indication mode adopting a single bit map, in the technical scheme of the application, the user equipment can flexibly adopt an indication mode with lower cost according to the number of the superposition coefficients with nonzero values, and the reference signals corresponding to the superposition coefficients with nonzero indication values help to reduce the coding cost of CSI, so that the uplink transmission code rate is reduced, and the stability of uplink transmission is improved.

In some embodiments, the number of the superposition coefficients with non-zero values is greater than a first threshold T1, the second indication information includes an identifier of a reference signal corresponding to a superposition coefficient with a zero value among the P superposition coefficients, and 0 < T1 < P. In this way, when the number of the superposition coefficients with the non-zero values is large and the number of the superposition coefficients with the zero values is small, the second indication information indirectly indicates the reference signal corresponding to the superposition coefficient with the non-zero value through the identifier of the reference signal corresponding to the superposition coefficient with the zero value. Therefore, whether the superposition coefficient corresponding to each reference signal is a non-zero superposition coefficient or not does not need to be indicated, the bit number of the second indication information can be reduced, and the expenditure is saved.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold value T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with the zero value in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, and each identification field indicates the identification of the corresponding reference signal in the reference signal group to which the reference signal belongs.

In this way, when the number of the superposition coefficients with the non-zero values is large and the number of the superposition coefficients with the zero values is small, the reference signals corresponding to the superposition coefficients with the non-zero values are indirectly indicated by indicating the identification of each identification field indicating the corresponding reference signal in the reference signal group to which the reference signal belongs. Therefore, whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value or not does not need to be indicated, the bit number of the second indication information can be reduced, and the expense is saved.

In some embodiments, the number of the superposition coefficients with the non-zero value is smaller than a first threshold T1, the second indication information includes a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is the superposition coefficient with the non-zero value, and 0 < T1 < P.

In this way, when the number of superposition coefficients having a value of zero is relatively large, the indication is performed by the bitmap without separately indicating the reference signal identifier corresponding to each superposition coefficient having a value of zero, so that the number of bits of the second indication information can be reduced, and overhead can be saved.

In some embodiments, the number of superposition coefficients with a non-zero value is equal to a first threshold T1,0 < T1 < P;

the second indication information comprises a bitmap, each bit of the bitmap corresponds to one reference signal in the P reference signals, and each bit indicates whether a superposition coefficient corresponding to the corresponding reference signal is a superposition coefficient of which the value is non-zero; or

The second indication information comprises the identifier of the reference signal corresponding to the superposition coefficient with the value of zero in the P superposition coefficients; or

The P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of reference signals corresponding to the superposition coefficient with a value of zero in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient having a value of zero, and each identification field indicates an identification of the corresponding reference signal in a reference signal group to which the reference signal belongs.

In a second aspect, an embodiment of the present application further provides a method for transmitting channel state information, including:

sending P reference signals, wherein each reference signal is obtained by precoding based on a precoding vector corresponding to the reference signal, and P is more than 1;

receiving first indication information and second indication information, wherein the first indication information is used for indicating the number of superposition coefficients with a nonzero median value among P superposition coefficients corresponding to the P reference signals, the second indication information is used for indicating reference signals corresponding to the superposition coefficients with the nonzero median value, the indication mode of the second indication information is associated with the number of the superposition coefficients with the nonzero median value, and the superposition coefficients with the nonzero median value are used for weighting and combining precoding vectors corresponding to the corresponding reference signals to construct combined precoding vectors;

and determining a reference signal corresponding to the superposition coefficient with the value being nonzero according to the first indication information and the second indication information.

According to the technical scheme of the embodiment of the application, the indication mode of the reference signal corresponding to the superposition coefficient with the non-zero indication value is associated with the number of the superposition coefficients with the non-zero indication value. Compared with an indication mode adopting a single bit map, in the technical scheme of the application, the user equipment can flexibly adopt an indication mode with lower cost according to the number of the superposition coefficients with the values being nonzero, and the reference signals corresponding to the superposition coefficients with the values being nonzero contribute to reducing the coding cost of the CSI, so that the uplink transmission code rate is reduced, and the stability of uplink transmission is improved.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold T1, the second indication information includes an identifier of a reference signal corresponding to the superposition coefficient with the zero value in the P superposition coefficients, and 0 < T1 < P. In this way, when the number of the superposition coefficients with the non-zero values is large and the number of the superposition coefficients with the zero values is small, the second indication information indirectly indicates the reference signal corresponding to the superposition coefficient with the non-zero value through the identifier of the reference signal corresponding to the superposition coefficient with the zero value. Therefore, whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value or not does not need to be indicated, the bit number of the second indication information can be reduced, and the expense is saved.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold value T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with the zero value in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient having a value of zero, and each identification field indicates an identification of the corresponding reference signal in a reference signal group to which the reference signal belongs.

In a third aspect, an embodiment of the present application further provides a transmission apparatus, including:

a receiving unit, configured to receive P reference signals, where each reference signal is a reference signal obtained by performing precoding based on a precoding vector corresponding to the reference signal, and P is greater than 1;

a processing unit, configured to generate first indication information and second indication information, where the first indication information is used to indicate the number of stacking coefficients whose median values of P stacking coefficients corresponding to the P reference signals are non-zero, and the second indication information is used to indicate reference signals corresponding to the stacking coefficients whose values are non-zero, where an indication manner of the second indication information is associated with the number of stacking coefficients whose values are non-zero, and the stacking coefficients whose values are non-zero are used to perform weighted combination on precoding vectors corresponding to corresponding reference signals to construct a combined precoding vector;

and the sending unit is used for sending the first indication information and the second indication information.

In this way, when the number of the superposition coefficients with the non-zero values is large and the number of the superposition coefficients with the zero values is small, the reference signals corresponding to the superposition coefficients with the non-zero values are indirectly indicated by indicating the identification of each identification field indicating the corresponding reference signal in the reference signal group to which the reference signal belongs. Therefore, whether the superposition coefficient corresponding to each reference signal is a non-zero superposition coefficient or not does not need to be indicated, the bit number of the second indication information can be reduced, and the expenditure is saved.

In this way, when the number of superposition coefficients with a value of zero is relatively large, the indication is performed through the bitmap, and the reference signal identifier corresponding to each superposition coefficient with a value of zero does not need to be indicated, so that the bit number of the second indication information can be reduced, and the overhead can be saved.

The P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the quantity of reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient having a value of zero, and each identification field indicates an identification of the corresponding reference signal in a reference signal group to which the reference signal belongs.

In a fourth aspect, an embodiment of the present application further provides a transmission apparatus, including:

a sending unit, configured to send P reference signals, where each reference signal is a reference signal obtained by performing precoding based on a precoding vector corresponding to the reference signal, and P is greater than 1;

a receiving unit, configured to receive first indication information and second indication information, where the first indication information is used to indicate a number of stacking coefficients whose median values of P stacking coefficients corresponding to the P reference signals are non-zero, and the second indication information is used to indicate a reference signal corresponding to the stacking coefficient whose value is non-zero, where an indication manner of the second indication information is associated with the number of stacking coefficients whose values are non-zero, and the stacking coefficient whose value is non-zero is used to perform weighted combining on precoding vectors corresponding to corresponding reference signals, so as to construct a combined precoding vector;

and the processing unit is used for determining the reference signal corresponding to the superposition coefficient of which the value is non-zero according to the first indication information and the second indication information.

In some embodiments, the number of the non-zero superposition coefficients is smaller than a first threshold T1, the second indication information includes a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the corresponding superposition coefficient of the corresponding reference signal is the non-zero superposition coefficient, and 0 < T1 < P.

The P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of reference signals corresponding to the superposition coefficient with a value of zero in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, and each identification field indicates the identification of the corresponding reference signal in the reference signal group to which the reference signal belongs.

In a fifth aspect, the present application provides a communication device, which is a user device or a terminal device, and includes a processor and a memory, where the memory is used to store computer instructions, and the processor executes a computer program or instructions in the memory, so that the method of any one of the embodiments of the first aspect or the second aspect is performed.

In a sixth aspect, the present application further provides a communication device, which includes a processor, a memory, and a transceiver, where the transceiver is configured to receive a signal or transmit a signal; a memory for storing program code; a processor for calling program code from memory to perform a method according to the first or second aspect. The memory is used for storing a computer program or instructions, and the processor is used for calling and executing the computer program or instructions from the memory, and when the processor executes the computer program or instructions in the memory, the communication device is caused to execute any one of the embodiments of the method of the first aspect or the second aspect.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

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

Optionally, the transceiver may include a transmitter (transmitter) and a receiver (receiver).

In a seventh aspect, the present application provides an apparatus comprising a processor coupled with a memory, and when the processor executes a computer program or instructions in the memory, the method of any of the above embodiments of the first aspect is performed. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the apparatus is a user equipment. When the communication device is a user device, the communication interface may be a transceiver, or an input/output interface. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the apparatus is a chip or a system of chips. When the apparatus is a chip or a system of chips, the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit, etc. on the chip or system of chips. A processor may also be embodied as a processing circuit or a logic circuit.

In an eighth aspect, the present application provides a communication device comprising a processor and an interface circuit, the interface circuit configured to receive code instructions and transmit the code instructions to the processor; the processor executes the code instructions to perform the method of any one of the possible implementations of the first aspect or the second aspect.

In a ninth aspect, the present application provides a system, which includes the above user equipment and network equipment.

In a tenth aspect, the present application provides a computer program product comprising: computer program (also called code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first aspect or the second aspect.

In an eleventh aspect, the present application provides a computer-readable storage medium storing a computer program (which may also be referred to as code or instructions) which, when executed on a computer, causes the computer to perform the method of any one of the possible implementations of the first aspect or the second aspect.

In a twelfth aspect, the present application further provides a chip, including: a processor and an interface for executing computer programs or instructions stored in the memory to perform the method of any of the possible implementations of the first aspect or the second aspect.

Drawings

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

fig. 2 is a schematic flowchart of a transmission method of channel state information according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram illustrating an indication manner of second indication information provided in an embodiment of the present application;

fig. 4 is a scene schematic diagram of an indication manner of second indication information according to an embodiment of the present application;

fig. 5 is a scene diagram illustrating another indication manner of second indication information according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating a correspondence relationship between the number of superposition coefficients with non-zero values and the bit number of second indication information according to an embodiment of the present application;

fig. 7 is a scene diagram illustrating another indication manner of the second indication information according to the embodiment of the present application;

fig. 8 is a schematic structural diagram of a transmission device according to an embodiment of the present application;

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

fig. 10 is a schematic structural diagram of a user equipment according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application;

FIG. 12 is a schematic diagram of an apparatus according to an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

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

Referring to fig. 1, fig. 1 is a network architecture diagram of a communication system according to the present application. The communication system of the embodiment of the present application includes a network device and one or more User Equipments (UEs).

The network device is a device in the access network, which communicates with the wireless ue through one or more cells, and may be, for example, an evolved Node B (NodeB, eNB, e-NodeB) in a Long Term Evolution (LTE) system or an advanced long term evolution-advanced (LTE-a) system, or may also include a new air interface network device gNB in the fifth generation mobile communication technology (the 5 g) NR system.

A UE may be a device that provides voice and/or data connectivity to a user and may include, for example, a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The user equipment may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The UE may include a wireless user equipment, a mobile user equipment, a device-to-device communication (D2D) user equipment, a vehicle-to-all (V2X) user equipment, a machine-to-machine/machine-type communication (M2M/MTC) user equipment, an internet of things (IoT) user equipment, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point, AP), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), or user equipment (user device), etc. For example, mobile telephones (otherwise known as "cellular" telephones), computers with mobile user equipment, portable, pocket, hand-held, computer-embedded mobile devices, and the like may be included. For example, personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, radio Frequency Identification (RFID), sensors, global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in embodiments of the present application, the UE may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment or intelligent wearable equipment and the like, and is a general term for applying wearable technology to carry out intelligent design and develop wearable equipment for daily wearing, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device may be worn directly on the body or may be a portable device integrated into the user's clothing or accessory. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be matched with other equipment such as a smart phone for use, such as various smart bracelets, smart helmets, smart jewelry and the like for physical sign monitoring.

While the various user devices described above, if located on a vehicle (e.g., placed in or installed in a vehicle), may be considered as vehicle-mounted user devices, such as also referred to as on-board units (OBUs), which are not limited in this application.

Based on the foregoing background art, in order to reduce coding overhead of CSI, in the technical solution of the embodiment of the present application, an indication manner of a reference signal corresponding to a superposition coefficient with a non-zero value is associated with the number of the superposition coefficients with the non-zero value. It can also be understood that the UE selects the reference signal corresponding to the superposition coefficient whose indication value is non-zero according to the number of the superposition coefficients whose values are non-zero. Therefore, the indication mode with lower cost can be flexibly adopted according to the number of the superposition coefficients with the nonzero values, and the reference signals corresponding to the superposition coefficients with the nonzero values are indicated, so that the CSI coding cost is favorably reduced.

The following describes the technical solution of the present application in detail with reference to the transmission method of channel state information in the embodiment of the present application.

Referring to fig. 2, fig. 2 is a schematic flowchart illustrating an information transmission method according to an embodiment of the present disclosure. The information transmission method comprises the following steps:

202. the network equipment sends P reference signals, wherein each reference signal is obtained by precoding based on a precoding vector corresponding to the reference signal, and P is more than 1;

correspondingly, the UE receives P reference signals, and the UE can obtain channel state information of the downlink channel according to the reference signals.

The P reference signals are transmitted by a plurality of antenna ports of the network device.

For example, the network device includes P antenna ports, each antenna port transmitting 1 reference signal, and the P antenna ports transmitting the P reference signals.

The reference signal received by the UE is a precoded reference signal obtained by the network equipment through precoding the reference signal according to the frequency domain basis vector and the space domain basis vector of the uplink channel.

Optionally, before step 202, the method further includes the steps of: 201. the UE sends a Sounding Reference Signal (SRS) to the network device.

The frequency domain basis vector and the space domain basis vector of the uplink channel are obtained by the network equipment according to the SRS sent by the UE. The frequency domain basis vector and the space domain basis vector of the uplink channel can be obtained according to the time delay and the angle of the uplink channel.

204. The UE generates first indication information and second indication information, wherein the first indication information is used for indicating the number of the superposition coefficients with the nonzero values in the P superposition coefficients corresponding to the P reference signals, and the second indication information is used for indicating the reference signals corresponding to the superposition coefficients with the nonzero values. The indication mode of the second indication information is related to the number of the superposition coefficients with the non-zero values.

And the superposition coefficient with the value of non-zero is used for weighting and combining the precoding vectors corresponding to the corresponding reference signals so as to construct combined precoding vectors. Or the superposition coefficient with the value of non-zero is used for carrying out weighting combination on the precoding vectors corresponding to the corresponding reference signals to construct a part of combined precoding vectors.

It should be understood that, among the P reference signals, a part is a reference signal corresponding to a superposition coefficient having a value of zero, and another part is a reference signal corresponding to a superposition coefficient having a value of non-zero. In the P superposition coefficients, the number of the non-zero superposition coefficients is N, and the number of the zero superposition coefficients is P-N. The superposition coefficients having a value other than zero may also be referred to as feedback coefficients.

The number of the superposition coefficients with the non-zero value indicated by the first indication information may or may not include the normalization coefficient.

206. The UE sends the first indication information and the second indication information.

Correspondingly, the network device receives the first indication information and the second indication information. In this way, the network device may perform weighted combining on the precoding vectors corresponding to the corresponding reference signals according to the superposition coefficient whose value is non-zero to construct a combined precoding vector, or construct a part of the combined precoding vector.

According to the technical scheme of the embodiment of the application, the indication mode of the reference signal corresponding to the superposition coefficient with the non-zero indicated value is associated with the number of the superposition coefficients with the non-zero indicated value, compared with the indication mode adopting a single bit map, the indication mode with lower cost can be flexibly adopted according to the number of the superposition coefficients with the non-zero indicated value, and the reference signal corresponding to the superposition coefficient with the non-zero indicated value is beneficial to reducing the coding cost of CSI, so that the uplink transmission code rate is reduced, and the stability of uplink transmission is improved.

The embodiment of the application provides some indication modes of the reference signals corresponding to the superposition coefficients with the second indication information indicating values being nonzero. Fig. 3 is a schematic diagram of an indication manner of second indication information provided in an embodiment of the present application. As shown in fig. 3, in the present application, when the number of superposition coefficients having a non-zero value is in different interval ranges, the indication methods of the corresponding second indication information are different.

The manner of indicating the second indication information when N ≧ P/2 is described below.

As shown in fig. 3, N ≧ P/2, the number of the superposition coefficients N whose values are non-zero is greater than a first threshold T1, and the second indication information indicates the reference signal corresponding to the superposition coefficient whose value is zero, thereby implementing the reference signal corresponding to the superposition coefficient whose indirect indication value is non-zero. And when N is less than T1, the second indication information indicates whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value or not in a bitmap mode, so that the reference signal corresponding to the superposition coefficient with the non-zero value is indicated. When N = T1, the second indication information indicates a reference signal corresponding to a zero superposition coefficient, and the indirect indication value indicates a reference signal corresponding to a nonzero superposition coefficient; or indicating whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value through a bitmap, and realizing the reference signal corresponding to the superposition coefficient with the non-zero value. T1 is more than 0 and less than P. It can be understood that P/2. Ltoreq. T1. Ltoreq.P.

The first threshold T1 may be calculated according to the number of superposition coefficients or the number P of reference signals. For example, the UE may determine T1 according to a threshold value of the number of superposition coefficients corresponding to a value other than zero when the number of bits required for indicating the reference signal corresponding to the superposition coefficient having zero in the second indication information is greater than or equal to the number of bits required for indicating in the bitmap.

The embodiment of the application provides specific indication modes of the reference signals corresponding to the superposition coefficients with the second indication information indicating values being zero when N is greater than T1.

In some embodiments, when N > T1, the second indication information includes an identification of a reference signal corresponding to a superposition coefficient having a value of zero among the P superposition coefficients. That is, the second indication information indicates the reference signal corresponding to the superposition coefficient with the value of zero by indicating the identifier of the reference signal corresponding to the superposition coefficient with the value of zero in the P superposition coefficients.

The identity of each reference signal may be determined from the rank number of the antenna port transmitting the reference signal. Specifically, the UE may determine the rank of the P reference signals according to the rank of the P antenna ports that transmit the P reference signals, and determine the identifier of each reference signal according to the rank number of each reference signal. For example, the reference signal sent by the 1 st antenna port is the 1 st reference signal, and the identifier of the 1 st reference signal may be 0; the reference signal sent by the 2 nd antenna port is the 2 nd reference signal, the identifier of the 2 nd reference signal can be 1, \8230;, the reference signal sent by the ith antenna port is the ith reference signal, the identifier of the ith reference signal can be i-1, i is a positive integer, and i is less than or equal to P.

In an example, 32 antenna ports of the network device respectively transmit 32 reference signals, and the UE receives the 32 reference signals to obtain 32 superposition coefficients corresponding to the 32 reference signals. When the number of superposition coefficients is 32, the corresponding first threshold T1 is 26.

Fig. 4 is a scene schematic diagram of an indication manner of second indication information according to an embodiment of the present application. As shown in fig. 4, the 1 st reference signal is identified as 0, \8230, the 6 th reference signal is identified as 5, \8230, the 20 th reference signal is identified as 19, \8230, the 29 th reference signal is identified as 28, and the 32 th reference signal is identified as 31.

The 32 superposition coefficients include 29 non-zero superposition coefficients and 3 zero superposition coefficients. That is, the 32 reference signals include 3 reference signals corresponding to the superposition coefficient having a value of zero and 29 reference signals corresponding to the superposition coefficient having a value of non-zero. It should be understood that the superposition coefficient denoted by reference numeral 1 in fig. 4 represents a superposition coefficient having a value of zero. The superposition coefficient denoted by 1 in fig. 4 does not indicate that the value of the superposition coefficient is 1, but is used to indicate that the value of the superposition coefficient is non-zero.

The reference signals corresponding to the superposition coefficients with the values of 3 being zero are respectively the reference signal sent by the 6 th antenna port, the reference signal sent by the 20 th antenna port and the reference signal sent by the 27 th antenna port. The number N of the superposition coefficients with the non-zero value is more than or equal to T1. The second indication information includes an identification of the reference signal corresponding to the superposition coefficient having a value of zero.

In the second indication information, the identifier of the reference signal corresponding to the superposition coefficient with a value of zero may be a binary value. The length of the identity of each reference signal may be

P =32, the length of the flag of each reference signal is 5. Wherein, the first and the second end of the pipe are connected with each other,

is rounded up. Thus, the labels of the 6 th, 20 th and 29 th reference signals are 00101, 10011 and 11100, respectively. The identifications of the reference signals included in the second indication information are 00101, 10011, and 11100, indicating the 6 th, 20 th, and 29 th reference signals, respectively. Thus, the number of bits of the second indication information is 3 × 5=15 bits.

In other embodiments, where N > T1, the P reference signals belong to Q reference signal groups, and each reference signal belongs to only one reference signal group. Q is a positive integer, Q > 1. The second indication information indicates the reference signal corresponding to the superposition coefficient with the value of zero through indicating the identification of the reference signal corresponding to the superposition coefficient with the value of zero in the belonging reference signal group.

The second indication information comprises Q quantity indication fields and at least one identification field, wherein each quantity indication field corresponds to one reference signal group.

Each number indication field indicates the number of reference signals corresponding to the superposition coefficient with a value of zero in the corresponding reference signal group. Each identification field corresponds to a superposition coefficient having a value of zero. Each identification field indicates the identification of the reference signal corresponding to the superposition coefficient whose value is zero in the reference signal group to which the reference signal belongs.

Optionally, the reference signals in each reference signal group and the identifier of each reference signal in the reference signal group to which the reference signal belongs may be determined by the UE in a manner agreed with the network device.

The identity of the reference signal in the reference signal group may be determined according to the rank number of the reference signal in the reference signal group to which the superposition coefficient with a value of zero corresponds. For example, the 1 st reference signal in each reference signal group may be identified by 0 in the reference signal group, the 2 nd reference signal in the reference signal group may be identified by 1, \ 8230 \ 8230;, the ith reference signal in the reference signal group may be identified by j-1, and j is a positive integer.

Optionally, the UE may determine Q according to the number of packets of the corresponding reference signal group when the sum of the number of bits of the number indication field and the number of bits of the identification field is minimum. The manner of determining Q may be that the UE and the network device have agreed. The UE may also determine the number Q of reference signal groups according to other agreed manners, and determine a reference signal group to which each of the P reference signals belongs according to the agreed manners. In this way, when the network device receives the second indication information, the reference signal group to which each of the Q and P reference signals belongs can be determined in a promised manner, so that the second indication information can be accurately read.

For example, in one possible implementation, the number of reference signals in each reference signal group is less than or equal to

And is greater than

Number of bits of a quantity indication field

Number of bits per identification field

Then the convention may be such that the P reference signals are divided into Q reference signal groups based on the value of Q when the sum of B1 × Q and B2 × N is minimal, corresponding to the minimum sum of Q.

The grouping mode is more balanced, and the length of each quantity indication field is equal, so that the network equipment can receive the second indication information conveniently. Moreover, such a grouping method is also simpler, and the UE has less calculation in determining the grouping method and determining the content of the second indication information.

For example, 32 reference signals are transmitted based on the 32 antenna ports, and the 32 reference signals include an example in which the superposition coefficients corresponding to 29 reference signals are non-zero superposition coefficients. Fig. 5 is a scene schematic diagram of another indication manner of the second indication information in the embodiment of the present application. As shown in fig. 5, the UE determines that the 32 reference signals include 4 reference signal groups, each of which has 8 reference signals, in a promised manner. The superposition coefficients corresponding to the 6 th, 20 th and 27 th reference signals in the 32 reference signals are the superposition coefficients with the value of zero.

Wherein the 1 st set of reference signals includes the 1 st to 8 th reference signals. The 1-8 reference signals are respectively the reference signals transmitted by the 1-8 th antenna ports. The 6 th reference signal of the 32 reference signals is the 6 th reference signal of the 1 st reference signal group. That is, the superposition coefficient corresponding to the 6 th reference signal in the 1 st reference signal group is a superposition coefficient having a value of zero. The 6 th reference signal in the 1 st reference signal group is also understood to be the reference signal corresponding to the 1 st superposition coefficient having a value of zero in the 32 reference signals.

The 2 nd set of reference signals includes the 9 th-16 th reference signals. The 9 th to 16 th reference signals are respectively reference signals transmitted by the 9 th to 16 th antenna ports. The superposition coefficients corresponding to the reference signals in the 2 nd reference signal group are all the superposition coefficients with non-zero values.

The 3 rd set of reference signals includes the 17 th-24 th reference signals. The 17 th to 24 th reference signals are respectively the reference signals transmitted by the 17 th to 24 th antenna ports. The 20 th reference signal of the 32 reference signals is the 4 th reference signal of the 3 rd reference signal group. That is, the superposition coefficient corresponding to the 4 th reference signal in the 3 rd reference signal group is the superposition coefficient with a zero value. The 4 th reference signal in the 3 rd reference signal group is understood to be the reference signal corresponding to the 2 nd of the 32 reference signals with a superposition coefficient having a value of zero.

The 4 th set of reference signals includes the 25 th to 32 th reference signals. The 25 th to 32 th reference signals are respectively reference signals transmitted by 25 th to 32 th antenna ports. The 27 th reference signal is the 3 rd reference signal in the 4 th reference signal group. That is, the superposition coefficient corresponding to the 3 rd reference signal in the 4 th reference signal group is the superposition coefficient with a zero value. The 3 rd reference signal in the 4 th reference signal group is understood to be the reference signal corresponding to the 3 rd of the 32 reference signals with a zero value of the superposition coefficient.

The second indication information includes 4 number indication fields and 3 identification fields.

Regarding the indication manner of the number indication fields, each number indication field may pass through the manner of indicating the value, indicating the number of reference signals corresponding to the superposition coefficient with a value of zero in the reference signal group corresponding to the number indication field. For example, the quantity indication field may indicate a value in a binary string. Number of bits of quantity indication field

A bit. The 4 number indication fields respectively corresponding to the 4 reference signal groups may be 01, 00, 01, and 01, respectively, and respectively indicate that the 1 st reference signal group includes 1 reference signal corresponding to a superposition coefficient having a value of zero, the 2 nd reference signal group does not include a reference signal corresponding to a superposition coefficient having a value of zero, the 3 rd reference signal group includes 1 reference signal corresponding to a superposition coefficient having a value of zero, and the 4 th reference signal group includes 1 reference signal corresponding to a superposition coefficient having a value of zero.

Regarding the indication manner of the identification field, the identification field may indicate the rank number of the reference signal corresponding to the superposition coefficient with a corresponding value of zero in the reference signal group to which the reference signal belongs. Specifically, the numerical value of the identification field is the rank number of the reference signal corresponding to the superposition coefficient with the value of zero in the reference signal group to which the reference signal belongs minus 1. The identity of each reference signal shown in fig. 5 in the associated reference signal group is a decimal value. In the second indication information, the identification field is indicated by using a corresponding binary value.

Thus, the number of bits per identification field

The 3 identification fields are respectively 101, 011 and 010, and respectively correspond to the 3 reference signals indicated by the 4 quantity indication fields and corresponding to the superposition coefficient with the value of zero. 101011 and 010 indicate 3 reference signals corresponding to the superposition coefficients with a value of zero, the ranking numbers in the belonging reference signal groups being 6 th, 4 th and 3 rd, respectively.

As shown in fig. 5, the 1 st identification field corresponds to 1 reference signal corresponding to a superposition coefficient having a value of zero among the 1 st group of reference signals indicated by the 1 st quantity indication field. The 1 st identification field 101 (with a corresponding decimal value of 5) indicates that the superposition coefficient corresponding to the 6 th reference signal in the 1 st reference signal group is a superposition coefficient with a zero value.

The 2 nd identification field corresponds to 1 reference signal corresponding to the superposition coefficient having a value of zero in the 3 rd reference signal group indicated by the 3 rd quantity indication field. The 2 nd identification field 011 (corresponding to a decimal value of 3) indicates that the superposition coefficient corresponding to the 4 th reference signal in the 3 rd reference signal group is a superposition coefficient with a zero value.

The 3 rd identification field corresponds to 1 reference signal corresponding to the superposition coefficient having a value of zero in the 4 th reference signal group indicated by the 4 th quantity indication field. The 3 rd identification field 010 (with a corresponding decimal value of 2) indicates that the superposition coefficient corresponding to the 3 rd reference signal in the 4 th reference signal group is a superposition coefficient with a zero value.

As can be seen from the above analysis, the number of bits of the 4 number indication fields may be 4 × b1=8 bits. The number of bits of the 3 identification fields is 3 × b2=9.

It can be derived that the total number of bits of the second indication information is 4 + b1+3 + b2=17 bits.

Of course, the grouping manner of the reference signals is not limited to the above-mentioned grouping manner, and in other embodiments, the number of reference signals in each reference signal group may be unbalanced, for example, the difference between the numbers of reference signals in different reference signal groups may be greater than 1. The identity of the reference signal is also not limited to being determined from the rank number of the reference signal, e.g., the identity of the reference signal may also be determined from the identity of the antenna port from which the reference signal is transmitted.

The following describes, by way of example, a scheme that when N < T1, the second indication information is indicated by using a bitmap.

The number N of the superposition coefficients with the non-zero value is less than T1, and the second indication information comprises a bitmap. Each bit of the bitmap corresponds to a reference signal, and each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is a superposition coefficient with a non-zero value.

For example, as shown in fig. 6, fig. 6 is a scene schematic diagram of another indication mode of the second indication information according to the embodiment of the present application. 32 antenna ports of the network device respectively transmit 32 reference signals. If the superposition coefficients corresponding to the 1 st, 3 rd, 9 th, 13 th, 17 th, 22 th, 24 th and 28 th reference signals are the superposition coefficients with a zero value, the superposition coefficients corresponding to the remaining 24 reference signals are the superposition coefficients with a non-zero value. Then the bit map is 01011111011101110111101011101111. The value of 1 st, 3 rd, 9 th, 13 th, 17 th, 22 th, 24 th, 28 th bit is 0, indicating that the superposition coefficient corresponding to the 1 st, 3 rd, 9 th, 13 th, 17 th, 22 th, 24 th, 28 th reference signal is a superposition coefficient with a zero value.

It can be seen that, in such an example, if the second indication information also adopts the above-mentioned indication method of the reference signal identifier corresponding to the superposition coefficient whose indication value is zero when N > T1, then the indication method needs to be adopted

A bit; if the second indication information adopts the above-mentioned indication manner indicating the identifier of the reference signal corresponding to each superposition coefficient with a value of zero in the reference signal group to which the superposition coefficient belongs when N > T1, then it is necessary to indicate that the reference signal group belongs

A bit. In the above-described manner of indicating the bitmap, the second indication information only needs 32 bits.

Similarly, if N > T1 in the corresponding example of fig. 4 and fig. 5, the second indication information is indicated by the reference signals corresponding to the 2 kinds of superposition coefficients indicating zero, and the required bit numbers are 15 and 17, respectively. Whereas if the second indication information is fixedly indicated by using a bitmap in any scene according to the prior art scheme, 32 bits are required. The 32-bit bitmap indicates whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a zero value.

Therefore, according to the technical scheme, compared with the second indication information, a unified indication mode is adopted, the overhead of the second indication information can be effectively reduced, the coding overhead of CSI is reduced, the uplink transmission code rate is reduced, and the stability of uplink transmission is improved.

When N = T1, the second indication information may be indicated by using any of the above-described indication methods of the reference signal corresponding to the superposition coefficient whose indication value is zero, or may be indicated by using the above-described bitmap indication method.

That is, when N = T1, the second indication information may include an identification of the reference signal corresponding to the superposition coefficient having a value of zero among the P superposition coefficients.

Alternatively, when N = T1, the second indication information may also include a plurality of quantity indication fields and at least one identification field. Each quantity indication field corresponds to a set of reference signals. Each quantity indication field indicates the number of reference signals corresponding to the superposition coefficient having a value of zero in the corresponding reference signal group. Each identification field corresponds to a superposition coefficient having a value of zero. Each identification field indicates the identification of the reference signal corresponding to the superposition coefficient with the corresponding value of zero in the reference signal group to which the reference signal belongs.

Or, when N = T1, the second indication information may further include a bitmap. Each bit of the bitmap corresponds to one reference signal, and each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is a superposition coefficient with a non-zero value.

It can be understood that when N > T1, the second indication information includes two indication modes indicating reference signals corresponding to the superposition coefficient with a value of zero, the 1 st type is that P reference signals are not grouped, the second indication information indicates an identifier of the reference signal corresponding to the superposition coefficient with a value of zero, the 2 nd type is that P reference signals belong to a plurality of reference signal groups, and the second indication information indicates an identifier of the reference signal corresponding to each superposition coefficient with a value of zero in the reference signal group to which the reference signal belongs. The UE may select the indication mode with the minimum required bit number from the two indication modes for indication.

Alternatively, the first threshold T1 may be a minimum value of the rounded value of the first critical value and the rounded value of the second critical value. The rounded value of the first critical value is the rounded value of the critical value of the number of the non-zero superposition coefficients when the number of bits required for the second indication information by adopting the 1 st indication mode is greater than or equal to the number of bits required for indication through the bitmap. The rounded value of the second critical value is the rounded value in the critical value of the number of the non-zero superposition coefficients when the number of bits required by the second indication information adopting the 2 nd indication mode is greater than or equal to the number of bits required by indication through the bitmap. The rounding value of the threshold value may be an upper rounding value of the threshold value or a lower rounding value of the threshold value.

Fig. 7 is a schematic diagram illustrating a correspondence relationship between the number of superposition coefficients with non-zero values and the bit number of the second indication information according to an embodiment of the present application. As shown in fig. 7, when the number of bits required for the second indication information according to the 1 st indication method is greater than or equal to the number of bits required for indication by the bitmap, the integer of the threshold value of the number of superposition coefficients corresponding to the non-zero value is 26. When the number of bits required for the second indication information using the 2 nd indication method is greater than or equal to the number of bits required for indication by the bitmap, the integer of the threshold value of the number of superposition coefficients corresponding to the non-zero value is 26. The UE may determine that the first threshold is 26.

The manner of indicating the second indication information when N < P/2 is described below.

And when N is less than T2, the second indication information directly indicates the reference signal corresponding to the superposition coefficient with the value being non-zero. When N is larger than T2, the second indication information indicates whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value or not in a bitmap mode, and the indication value is the reference signal corresponding to the non-zero superposition coefficient. When N = T1, the second indication information directly indicates the reference signal corresponding to the superposition coefficient with a non-zero value, or indicates whether the superposition coefficient corresponding to each reference signal is the superposition coefficient with a non-zero value in a bitmap manner. T1 is more than 0 and less than P. It can be understood that 0. Ltoreq. T2. Ltoreq.P/2.

It should be understood that the manner in which the superposition coefficient with the second indication information indicating value being non-zero corresponds to the reference signal when N < T2, and the manner in which the superposition coefficient with the second indication information indicating value being zero corresponds to the reference signal when N > T1, may be symmetrical.

The following explains a manner of indicating the reference signal corresponding to the superposition coefficient in which the second indication information indicates non-zero when N < T2.

In some embodiments, when N < T2, the second indication information includes an identification of a reference signal corresponding to a non-zero superposition coefficient of the P superposition coefficients. For a specific implementation manner of the identifier of the reference signal corresponding to the superposition coefficient with the value being non-zero, reference may be made to the description related to the identifier of the reference signal corresponding to the superposition coefficient with the indication value being zero when N is greater than T1 in the foregoing embodiment, and details are not repeated here in order to avoid redundancy.

In other embodiments, when N < T2, the second indication information includes a plurality of quantity indication fields and at least one identification field, and each quantity indication field corresponds to one reference signal group. Each number indication field indicates the number of reference signals corresponding to the non-zero value of the superposition coefficient in the corresponding reference signal group. Each identification field corresponds to a superposition coefficient having a value that is non-zero. Each identification field indicates the identification of the reference signal corresponding to the superposition coefficient whose corresponding value is non-zero in the reference signal group to which the reference signal belongs. In the above embodiment, when N is greater than T1, in an embodiment where the second indication information indicates an identifier of a reference signal corresponding to each superposition coefficient whose value is zero in the reference signal group to which the reference signal belongs, the description about the quantity indication field and the identifier field is omitted here for avoiding redundancy.

The number N of the superposition coefficients with the non-zero value is larger than T2, and the second indication information comprises the bitmap. Each bit of the bitmap corresponds to a reference signal, and each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is a superposition coefficient with a non-zero value. For the implementation of the bitmap, reference may be made to the related description of the above embodiments, and details are not repeated here to avoid redundancy.

According to the above embodiment, as shown in fig. 3, when T2 < N < T1, the second indication information includes a bitmap.

When N = T2, the second indication information includes an identifier of a reference signal corresponding to a non-zero superposition coefficient of the P superposition coefficients.

Or, the second indication information includes a plurality of quantity indication fields and at least one identification field, and each quantity indication field corresponds to one reference signal group. Each number indication field indicates the number of reference signals corresponding to the non-zero value of the superposition coefficient in the corresponding reference signal group. Each identification field corresponds to a superposition coefficient having a value that is non-zero. Each identification field indicates the identification of the reference signal corresponding to the superposition coefficient with a non-zero value in the reference signal group to which the reference signal belongs.

Alternatively, the second indication information includes the bitmap. Each bit of the bitmap corresponds to a reference signal, and each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is a superposition coefficient with a non-zero value.

In an alternative embodiment, provided herein, T2= P-T1. This can simplify the process of determining the second threshold.

Alternatively, the manner of determining T2 may also be in a similar manner to that described above for determining T1.

Specifically, when N is less than T2, the second indication information includes two indication modes indicating reference signals corresponding to superposition coefficients whose indication values are non-zero, one is an identifier indicating a reference signal corresponding to a superposition coefficient whose indication value is non-zero directly, and the other is an identifier indicating a reference signal corresponding to each superposition coefficient whose value is non-zero in the reference signal group to which the reference signal belongs. The UE may select the indication mode with the minimum required bit number from the two indication modes for indication.

The second threshold may be a maximum of the rounded value of the third critical value and the rounded value of the fourth critical value. The second indication information directly indicates that the number of bits required for the identifier of the reference signal corresponding to the superposition coefficient whose value is non-zero is greater than or equal to the number of bits required for indication by the bitmap, and the corresponding value is the integer of the critical value of the number of the non-zero superposition coefficients. The second threshold value is an integer of the threshold value of the number of the corresponding non-zero superposition coefficients when the second indication information indicates that the number of bits required for identifying the reference signal corresponding to each non-zero superposition coefficient in the belonging reference signal group is greater than or equal to the number of bits required for indicating through the bit map. The rounded value of the threshold may be an upper rounded value of the threshold or a lower rounded value of the threshold.

In some optional embodiments, the P antenna ports of the network device include P1 antenna ports corresponding to the first polarization direction and P2 antenna ports corresponding to the second polarization direction.

In the P1 reference signals sent by the P1 antenna ports, the superposition coefficients corresponding to the N1 reference signals are non-zero superposition coefficients. The reference signals sent by the P2 antenna ports include superposition coefficients with non-zero values corresponding to the N2 reference signals. It is understood that N = N1+ N2.

In one possible implementation, N1= N2, the first indication information indicates that the number of the non-zero superposition coefficients is N1 or N2. That is, the first indication information indicates the number N of the non-zero superposition coefficients among the P superposition coefficients by indicating N1 or N2. N =2 × N1, or N =2 × N2.

For example, the network device includes 32 antenna ports. The 1 st to 16 th antenna ports correspond to a first polarization direction and the 17 th to 32 th antenna ports correspond to a second polarization direction. The 32 antenna ports respectively transmit 32 reference signals, namely reference signal 1, reference signal 2, reference signal 3, \ 8230 \ 8230;, reference signal 32. Each reference signal corresponds to a superposition coefficient.

Then, the first indication information may indicate the number of reference signals corresponding to the non-zero superposition coefficient among the reference signals 1 to 16; or to indicate the number of reference signals corresponding to non-zero valued superposition coefficients of the reference signals 17-32.

Further, the second indication information indicates only N1 reference signals or N2 reference signals. That is, the ordering positions of the N1 reference signals in the P1 reference signals are the same as the ordering positions of the P2 reference signals in the N2 reference signals by default. The second indication information indicates only the reference signal of the superposition coefficient of which the value of one polarization direction is non-zero. The network equipment determines the reference signals of the superposition coefficients with the non-zero values in the two polarization directions according to the reference signals of the superposition coefficients with the non-zero values in one polarization direction. Therefore, the second indication information can be simplified, the bit number of the second indication information can be reduced, the overhead of the second indication information can be reduced, the coding overhead of CSI can be reduced, the uplink transmission code rate can be reduced, and the stability of uplink transmission can be improved.

Based on the above example, the second indication information may indicate only the reference signals corresponding to the superposition coefficients with non-zero values among the reference signals 1 to 16; or only the reference signals corresponding to the non-zero value of the superposition coefficients of the reference signals 17-32.

It should be understood that the first indication information may also indicate N1+ N2. That is, the first indication information may also indicate the number of the P reference signals transmitted by the P antenna ports and the number of the reference signals corresponding to the superposition coefficient with a non-zero value.

The second indication information may also indicate N1 reference signals and N2 reference signals. That is, the second indication information may indicate a reference signal corresponding to a non-zero superposition coefficient among the P reference signals transmitted by the P antenna ports.

In some optional embodiments, in step 206, the UE may send the first indication information first and then send the second indication information. For example, step 203 may include:

2061. the UE transmits a first part of channel state information (CSI-part I), the CSI-part I including first indication information;

2062. the UE transmits a second part of the channel state information (CSI-part II), the CSI-part II including second indication information.

Correspondingly, the network equipment receives the CSI-part I firstly to obtain first indication information, and determines the indication mode of the second indication information according to the number of superposition coefficients with nonzero median values of P superposition coefficients corresponding to P reference signals indicated by the first indication information. And then the network equipment receives second indication information in the CSI-part II according to the indication mode of the second indication information, and obtains a reference signal corresponding to the superposition coefficient with a nonzero value according to the second indication information.

The CSI-part I may further include a Rank Indicator (RI), a Channel Quality Indicator (CQI). The CSI-part II may further include: a beam index of a maximum feedback coefficient in each transport layer, indication information indicating amplitude quantization of the feedback coefficient, indication information indicating phase quantization of the feedback coefficient.

It is understood that in an FDD system, the uplink channel and the downlink channel have a partial reciprocity, for example, the angle and the delay of the uplink channel and the angle delay of the downlink channel can be considered to be the same. In the embodiment of the application, the reference signal received by the UE is a precoded reference signal obtained by precoding a precoding vector according to a frequency domain basis vector and a space domain basis vector of an uplink channel. The frequency domain basis vector and the space domain basis vector of the uplink channel are obtained by the network equipment according to the SRS sent by the UE. Therefore, the uplink channel and the downlink channel have partial reciprocity, and time delay and angle information of the downlink channel do not need to be transmitted in the CSI-part II, so that the cost of the CSI-part II is saved.

In an alternative embodiment, when the rank indications are different, the number of the superposition coefficients with the non-zero value indicated by the first indication information is the same.

In another alternative embodiment, the value range of the rank indication includes a first value range and a second value range; the number of the superposition coefficients with a non-zero value indicated by the first indication information when the rank indication is any value in the first numerical value range is different from the number of the superposition coefficients with a non-zero value indicated by the first indication information when the rank indication is any value in the second numerical value range.

Further, the first value range includes at least two values, and the number of the superposition coefficients with the non-zero value indicated by the first indication information is the same when the rank is indicated as a different value in the first value range.

Optionally, the number of the superposition coefficients with non-zero values corresponding to different transmission layers is the same, the number of the superposition coefficients with non-zero values indicated by the first indication information is the number of the superposition coefficients with non-zero values corresponding to any transmission layer; or the number of the superposition coefficients with the non-zero values corresponding to different transmission layers is different, the number of the superposition coefficients with the non-zero values indicated by the first indication information is the sum of the number of the superposition coefficients with the non-zero values corresponding to a plurality of layers or the number of the superposition coefficients with the non-zero values corresponding to each layer.

Optionally, in other embodiments, frequency domain combing may be performed. The UE may obtain M × P superposition coefficients according to the P reference signals. M is frequency domain combing multiple. M is a positive integer. The number of the superposition coefficients with the non-zero values indicated in the first indication information is the number of the superposition coefficients with the non-zero values in the M × P superposition coefficients.

In the embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspective of the user equipment and the network equipment, respectively. In order to implement the functions in the method provided by the embodiment of the present application, the user equipment and the network equipment may include a hardware structure and a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Some of the above functions may be implemented by a hardware structure, a software module, or a hardware structure plus a software module.

The embodiment of the application also provides a transmission device. Referring to fig. 8, fig. 8 is a schematic structural diagram of a transmission device according to an embodiment of the present application. The transmission apparatus 800 may be, for example, a communication device or a network device. The transmission device 800 includes:

a receiving unit 801, configured to receive P reference signals, where each reference signal is a reference signal obtained by performing precoding based on a precoding vector corresponding to the reference signal, and P > 1;

a processing unit 802, configured to generate first indication information and second indication information, where the first indication information is used to indicate the number of stacking coefficients whose median values are non-zero among P stacking coefficients corresponding to the P reference signals, and the second indication information is used to indicate reference signals corresponding to the stacking coefficients whose values are non-zero, where an indication manner of the second indication information is associated with the number of stacking coefficients whose values are non-zero, and the stacking coefficients whose values are non-zero are used to perform weighted combination on precoding vectors corresponding to corresponding reference signals, so as to construct a combined precoding vector;

a sending unit 803, configured to send the first indication information and the second indication information.

Here, the receiving unit 801 and the transmitting unit 803 may be understood as a transmitting and receiving unit.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold T1, the second indication information includes an identifier of a reference signal corresponding to the superposition coefficient with the zero value among the P superposition coefficients, and 0 < T1 < P. In this way, when the number of the superposition coefficients with the non-zero values is large and the number of the superposition coefficients with the zero values is small, the second indication information indirectly indicates the reference signal corresponding to the superposition coefficient with the non-zero value through the identifier of the reference signal corresponding to the superposition coefficient with the zero value. Therefore, whether the superposition coefficient corresponding to each reference signal is a superposition coefficient with a non-zero value or not does not need to be indicated, the bit number of the second indication information can be reduced, and the expense is saved.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold T1, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with the zero value in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, and each identification field indicates the identification of the corresponding reference signal in the reference signal group to which the reference signal belongs.

The embodiment of the application also provides a transmission device. Referring to fig. 9, fig. 9 is a schematic structural diagram of another transmission device according to an embodiment of the present application. The transmission apparatus 900 may be, for example, a communication device or a user equipment. The transmission apparatus 900 includes:

a sending unit 901, configured to send P reference signals, where each reference signal is a reference signal obtained by performing precoding based on a precoding vector corresponding to the reference signal, and P is greater than 1;

a receiving unit 902, configured to receive first indication information and second indication information, where the first indication information is used to indicate the number of superposition coefficients whose median values are non-zero among P superposition coefficients corresponding to the P reference signals, and the second indication information is used to indicate reference signals corresponding to the superposition coefficients whose values are non-zero, where an indication manner of the second indication information is associated with the number of superposition coefficients whose values are non-zero, and the superposition coefficients whose values are non-zero are used to perform weighted combination on precoding vectors corresponding to corresponding reference signals to construct a combined precoding vector;

a processing unit 903, configured to determine, according to the first indication information and the second indication information, a reference signal corresponding to the superposition coefficient whose value is non-zero.

The transmitting unit 901 and the receiving unit 902 may be understood as a transceiver unit.

In some embodiments, the number of the superposition coefficients with the non-zero value is greater than a first threshold T1, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with the zero value in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient having a value of zero, and each identification field indicates an identification of the corresponding reference signal in a reference signal group to which the reference signal belongs.

The P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, and each quantity indication field indicates the quantity of reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group; each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, and each identification field indicates the identification of the corresponding reference signal in the reference signal group to which the reference signal belongs.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a user equipment according to an embodiment of the present application. The embodiment of the present application provides a user equipment 1000, which includes a processor 1001 and a memory 1002, where the memory 1002 is configured to store computer instructions, and the processor 1001 executes computer programs or instructions in the memory, so that the user equipment 1000 performs the steps that can be performed by the user equipment 1000 in any of the method embodiments described above.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application. The embodiment of the present application provides a network device 1100, which includes a processor 1101 and a memory 1102, where the memory 1102 is used to store computer instructions, and the processor 1101 executes computer programs or instructions in the memory, so that the network device 1100 performs the steps that can be performed by the network device 1100 in any of the method embodiments described above.

Referring to fig. 12, fig. 12 is a schematic structural diagram of an apparatus according to an embodiment of the present disclosure. The apparatus 1200 comprises a processor 1201, the processor 1201 being coupled to a memory 1202, the apparatus 1200 performing the steps executable by the network device in any of the method embodiments described above or performing the steps executable by the user equipment in any of the method embodiments described above when the processor 1201 executes computer programs or instructions in the memory. Optionally, the apparatus 1200 further comprises a memory 1202. Optionally, the apparatus further comprises a communication interface 1203 to which the processor is coupled.

In one implementation, the apparatus 1200 is a user equipment. When the device 1200 is a user device, the communication interface may be a transceiver, or an input/output interface, or the receiving unit 801 and the sending unit 803 in the corresponding embodiment of fig. 8. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the apparatus 1200 is a network device. When the device 1200 is a network device, the communication interface may be a transceiver, or an input/output interface, or the transmitting unit 901 and the receiving unit 902 in the corresponding embodiment of fig. 9. Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the 1200 is a chip or a system-on-a-chip. When the chip 1200 is a chip or a system of chips, the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit, etc. on the chip or the system of chips. A processor may also be embodied as a processing circuit or a logic circuit.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device 1300 comprises a processor 1301 and an interface circuit 1302, the interface circuit 1302 being configured to receive code instructions and transmit the code instructions to the processor 1301; the processor 1301 executes the code instructions to perform the steps that may be performed by the network device in any of the method embodiments described above or to perform the steps that may be performed by the user equipment in any of the method embodiments described above.

Referring to fig. 14, fig. 14 is a schematic structural diagram of a chip according to an embodiment of the present application. An embodiment of the present application further provides a chip 1400, including: a processor 1401 and an interface 1402 for executing computer programs or instructions stored in the memory, for performing steps that may be performed by the network device in any of the above method embodiments or by the user device in any of the above method embodiments.

The present application provides a computer program product comprising: a computer program (also referred to as code, or instructions), which when executed, causes a computer to perform the steps that may be performed by the network device in any of the above method embodiments or by the user equipment in any of the above method embodiments.

The present application provides a computer-readable storage medium storing a computer program (also referred to as code, or instructions) which, when run on a computer, causes the computer to perform the steps that can be performed by a network device in any of the above method embodiments or to perform the steps that can be performed by a user equipment in any of the above method embodiments.

It should also be understood that reference herein to first, second, third, fourth, and various numerical designations is made only for ease of description and should not be used to limit the scope of the present application.

It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and 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.

It should be understood that, in the various embodiments of the present application, 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.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. 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 type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

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

The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.

The modules in the device can be combined, divided and deleted according to actual needs.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for transmitting channel state information, comprising:

generating first indication information and second indication information, wherein the first indication information is used for indicating the number of superposition coefficients with a nonzero median value in the P superposition coefficients corresponding to the P reference signals, the second indication information is used for indicating the reference signals corresponding to the superposition coefficients with the nonzero median value, the indication mode of the second indication information is associated with the number of the superposition coefficients with the nonzero median value, and the superposition coefficients with the nonzero median value are used for weighting and combining precoding vectors corresponding to the corresponding reference signals to construct combined precoding vectors;

2. The method according to claim 1, wherein the number of the superposition coefficients with the non-zero value is greater than a first threshold T1, and the second indication information includes an identifier of a reference signal corresponding to the superposition coefficient with the zero value among the P superposition coefficients, where 0 < T1 < P.

3. The method according to claim 1, wherein the number of the superposition coefficients with non-zero values is greater than a first threshold T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group;

each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, and each identification field indicates the identification of the corresponding reference signal in the reference signal group to which the reference signal belongs.

4. The method according to any one of claims 1 to 3, wherein the number of the superposition coefficients with the non-zero value is smaller than a first threshold value T1, the second indication information comprises a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the superposition coefficient corresponding to the corresponding reference signal is the superposition coefficient with the non-zero value, and 0 < T1 < P.

5. A method according to any one of claims 1 to 3, characterized in that the number of superposition coefficients whose value is non-zero is equal to a first threshold value T1,0 < T1 < P;

6. A method for transmitting channel state information, comprising:

7. The method according to claim 6, wherein the number of the superposition coefficients with the non-zero value is greater than a first threshold value T1, and the second indication information includes an identifier of a reference signal corresponding to the superposition coefficient with the zero value among the P superposition coefficients, where 0 < T1 < P.

8. The method according to claim 6, wherein the number of the superposition coefficients with non-zero values is greater than a first threshold T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, each quantity indication field indicates the number of the reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group;

9. The method according to any one of claims 6 to 8, wherein the number of the non-zero-valued superposition coefficients is smaller than a first threshold T1, and the second indication information comprises a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the corresponding superposition coefficient of the corresponding reference signal is the non-zero-valued superposition coefficient, and 0 < T1 < P.

10. The method according to any one of claims 6 to 8, characterized in that the number of superposition coefficients with a non-zero value is equal to a first threshold value T1,0 < T1 < P;

11. A transmission apparatus, comprising:

a processing unit, configured to generate first indication information and second indication information, where the first indication information is used to indicate the number of superposition coefficients whose median values are non-zero among P superposition coefficients corresponding to the P reference signals, and the second indication information is used to indicate reference signals corresponding to the superposition coefficients whose values are non-zero, where an indication manner of the second indication information is associated with the number of superposition coefficients whose values are non-zero, and the superposition coefficients whose values are non-zero are used to perform weighted combination on precoding vectors corresponding to corresponding reference signals to construct a combined precoding vector;

12. The apparatus according to claim 11, wherein the number of the non-zero superposition coefficients is greater than a first threshold T1, and the second indication information includes an identifier of a reference signal corresponding to the zero superposition coefficient of the P superposition coefficients, where 0 < T1 < P.

13. The apparatus of claim 11, wherein the number of superposition coefficients with non-zero values is greater than a first threshold T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information comprises a plurality of quantity indication fields and at least one identification field corresponding to each quantity indication field, each quantity indication field corresponds to one reference signal group, each quantity indication field indicates the number of reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group;

each identification field corresponds to a reference signal corresponding to a superposition coefficient with a value of zero, each identification field indicates an identification field corresponding to an identification number indication field of the corresponding reference signal in a reference signal group to which the reference signal belongs, and indicates an identification of the reference signal corresponding to the superposition coefficient with the value of zero in the reference signal group corresponding to the number indication field in the reference signal group.

14. The apparatus according to any one of claims 11-13, wherein the number of the non-zero-valued superposition coefficients is smaller than a first threshold T1, and the second indication information comprises a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the corresponding superposition coefficient of the corresponding reference signal is the non-zero-valued superposition coefficient, and 0 < T1 < P.

15. The apparatus according to any of claims 11-13, wherein the number of superposition coefficients with non-zero value is equal to a first threshold T1,0 < T1 < P;

16. A transmission apparatus, comprising:

a receiving unit, configured to receive first indication information and second indication information, where the first indication information is used to indicate a number of superposition coefficients whose median values are non-zero among P superposition coefficients corresponding to the P reference signals, and the second indication information is used to indicate reference signals corresponding to the superposition coefficients whose values are non-zero, where an indication manner of the second indication information is associated with the number of superposition coefficients whose values are non-zero, and the superposition coefficients whose values are non-zero are used to perform weighted combination on precoding vectors corresponding to corresponding reference signals to construct a combined precoding vector;

and the processing unit is used for determining the reference signal corresponding to the superposition coefficient with the value being nonzero according to the first indication information and the second indication information.

17. The apparatus according to claim 16, wherein the number of the non-zero superposition coefficients is greater than a first threshold T1, and the second indication information includes an identifier of a reference signal corresponding to the zero superposition coefficient of the P superposition coefficients, where 0 < T1 < P.

18. The apparatus according to claim 16, wherein the number of the superposition coefficients with non-zero values is greater than a first threshold T1,0 < T1 < P, the P reference signals belong to a plurality of reference signal groups, each reference signal belongs to only one reference signal group, the second indication information includes a plurality of quantity indication fields and at least one identification field, each quantity indication field corresponds to one reference signal group, each quantity indication field indicates the number of reference signals corresponding to the superposition coefficients with zero values in the corresponding reference signal group;

19. The apparatus according to any one of claims 16-18, wherein the number of the non-zero-valued superposition coefficients is smaller than a first threshold T1, and the second indication information comprises a bitmap, each bit of the bitmap corresponds to one of the P reference signals, each bit indicates whether the corresponding superposition coefficient of the corresponding reference signal is the non-zero-valued superposition coefficient, and 0 < T1 < P.

20. The apparatus according to any of claims 16-18, wherein the number of the non-zero value of the superposition coefficients is equal to a first threshold T1,0 < T1 < P;

21. A communication device comprising a processor and a memory, the memory storing computer instructions, execution of which by the processor causes the communication device to perform the method of any of claims 1-5 or causes the communication device to perform the method of any of claims 6-10.

22. A computer-readable storage medium having stored therein computer instructions for instructing a communication device to perform the method of any of claims 1-5 or the method of any of claims 6-10.

23. A chip, comprising: a processor and an interface for executing a computer program or instructions stored in a memory for performing the method of any of claims 1-5 or the method of any of claims 6-10.

24. A computer program product, characterized in that the computer program product comprises a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1-5 or the method of any one of claims 6-10.