CN114008947B

CN114008947B - Transmission and determination of channel state information

Info

Publication number: CN114008947B
Application number: CN201980097612.8A
Authority: CN
Inventors: 刘皓; W·J·希勒里
Original assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy
Current assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2024-02-20
Anticipated expiration: 2039-06-19
Also published as: CN114008947A; WO2020252691A1

Abstract

Embodiments of the present disclosure relate to methods, apparatuses, devices, and computer-readable storage media for transmission and determination of CSI. The first device determines a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority. The first device determining a CSI report from the set of CSI reports for which second information is to be partially transmitted, determining a total number of non-zero coefficients across the channel layers in a first portion of the determined CSI report; determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and transmitting the determined first portion of the CSI report to the second device based on the payload size. The second device receives a data stream from the first device regarding the set of CSI reports and determines the first portion from the data stream in a similar manner. In this way, the payload size of the priority level of CSI can be conveniently determined by the allocated resources without requiring additional UCI part 1 design, and CSI can be successfully transmitted and determined.

Description

Transmission and determination of channel state information

Technical Field

Embodiments of the present disclosure relate generally to the field of telecommunications and, in particular, relate to methods, apparatuses, devices, and computer-readable storage media for transmission and determination of Channel State Information (CSI).

Background

In the latest 3GPP specifications (i.e., release 16), agreement has been made on: type II CSI reports, which are designed for lower ranks, such as Rank Indication (RI) of 1 or 2, may be extended to higher ranks, such as RI of 3 or 4, in order to support more data streams per User Equipment (UE) for single user multiple input multiple output (SU-MIMO) or multi user multiple input multiple output (MU-MIMO) transmission.

The rank may indicate the number of independent transport layers supported in the communication channel. The overhead of CSI reporting has a wide dynamic range due to the number of layers added for higher rank extension, the total number of non-zero (NZ) coefficients across layers, and the per-layer bitmap, etc. Thus, there is typically some difference between the network device's allocation of resources on the Physical Uplink Shared Channel (PUSCH) and the actual payload requirements for CSI reporting at the terminal device. How to deal with the situation where the allocated resource capacity is insufficient for CSI reporting becomes a hotspot.

Disclosure of Invention

In general, example embodiments of the present disclosure provide a solution for transmission and determination of CSI.

In a first aspect, a method is provided. The method comprises the following steps: determining, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that are required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority; determining a CSI report from the set of CSI reports, the second information of which is to be partially transmitted; determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; determining a payload size of the determined first portion of the CSI report based on a total number of non-zero coefficients; and transmitting the determined first portion of the CSI report to the second device based on the payload size.

In a second aspect, a method is provided. The method comprises the following steps: receiving, by the second device and from a first device served by the second device, a data stream regarding a set of CSI reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority; determining a CSI report whose second information is partially transmitted from the set of CSI reports; determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and determining a first portion of the determined CSI report from the data stream based on the payload size.

In a third aspect, an apparatus is provided. The apparatus includes at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to: determining, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that are required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first part and a second part, the first part having a first priority for transmission and the second part having a second priority for transmission that is lower than the first priority; determining a CSI report from the set of CSI reports, the second information of which is to be partially transmitted; determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and transmitting the determined first portion of the CSI report to the second device based on the payload size.

In a fourth aspect, an apparatus is provided. The apparatus includes at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to: a data stream is received by and from a first device served by the second device, the data stream relating to a set of Channel State Information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information relating to a first set of parameters that are required to be transmitted and second information relating to a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority. Determining a CSI report whose second information is partially transmitted from the set of CSI reports; determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and determining a first portion of the determined CSI report from the data stream based on the payload size.

In a fifth aspect, there is provided an apparatus comprising: means for determining, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first part and a second part, the first part having a first priority for transmission and the second part having a second priority for transmission that is lower than the first priority; means for determining CSI reports from the set of CSI reports for which second information is to be partially transmitted; means for determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; means for determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and means for transmitting the determined first portion of the CSI report to the second device based on the payload size.

In a sixth aspect, there is provided an apparatus comprising: means for receiving, by the second device and from a first device served by the second device, a data stream regarding a set of Channel State Information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and including first information regarding a need to be transmitted a first set of parameters and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission that is lower than the first priority; means for determining CSI reports from the set of CSI reports for which second information is partially transmitted; means for determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; means for determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and means for determining a first portion of the determined CSI report from the data stream based on the payload size.

In a seventh aspect, there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the first or second aspect.

It should be understood that the summary is not intended to identify key or essential features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

Some example embodiments will now be described with reference to the accompanying drawings, in which:

FIG. 1 illustrates an example communication network in which example embodiments of the present disclosure may be implemented;

fig. 2 illustrates a schematic diagram of a process for CSI reporting according to an example embodiment of the present disclosure;

FIG. 3 illustrates a flowchart of a method implemented at a first device according to an example embodiment of the present disclosure;

FIG. 4 illustrates a flowchart of a method implemented at a second device according to an example embodiment of the present disclosure;

FIG. 5 illustrates a simplified block diagram of an apparatus suitable for practicing the example embodiments of the present disclosure; and

fig. 6 illustrates a block diagram of an example computer-readable medium, according to an example embodiment of the present disclosure.

The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements.

Detailed Description

Principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and practicing the present disclosure without implying any limitation on the scope of the present disclosure. The disclosure described herein may be implemented in various ways other than those described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

References in the present disclosure to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It will be understood that, although the terms "first" and "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "has," "including" and/or "having," when used herein, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.

As used in this application, the term "circuitry" may refer to one or more or all of the following:

(a) Pure hardware circuit implementations (such as implementations in analog and/or digital circuitry only) and

(b) A combination of hardware circuitry and software, such as (if applicable):

(i) Combination of analog and/or digital hardware circuit(s) and software/firmware, and

(ii) Any portion of the hardware processor(s) with software (including digital signal processor), software, and memory(s) that work together to cause a device such as a mobile phone or server to perform various functions), and

(c) Hardware circuit(s) and/or processor(s) such as microprocessor(s) or portion of microprocessor(s) that require software (e.g., firmware) to run, but the software may not exist when they are not needed for operation.

This definition of circuitry applies to all uses of this term in this application, including all uses in any claims. As a further example, as used in this application, the term circuitry also encompasses hardware-only circuitry or a processor (or multiple processors) or a portion of a hardware circuit or processor and its (or their) implementation in conjunction with software and/or firmware. For example and where applicable to the elements of the specific claims, the term circuitry also encompasses a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, a cellular network device, or other computing or network device.

As used herein, the term "communication network" refers to a network that conforms to any suitable communication standard, such as Long Term Evolution (LTE), LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), high Speed Packet Access (HSPA), narrowband internet of things (NB-IoT), and the like. Furthermore, the communication between the terminal device and the network device may be performed in the communication network according to any suitable generation communication protocol, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, future fifth generation (5G) communication protocols, and/or any other protocol currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. In view of the rapid development of communications, there will of course also be future types of communication technologies and systems that may embody the present disclosure. And should not be taken as limiting the scope of the present disclosure to only the above-described systems.

As used herein, the term "network device" refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. A network device may refer to a Base Station (BS) or an Access Point (AP), such as a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NRNB (also known as a gNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, a low power node (such as a femto, pico, etc.), depending on the terminology and technology applied.

The term "terminal device" refers to any terminal device that may be capable of wireless communication. By way of example, and not limitation, a terminal device may also be referred to as a communication device, user Equipment (UE), subscriber Station (SS), portable subscriber station, mobile Station (MS), or Access Terminal (AT). The terminal devices may include, but are not limited to, mobile phones, cellular phones, smart phones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal Digital Assistants (PDAs), portable computers, desktop computers, image capture terminal devices (such as digital cameras), gaming terminal devices, music storage and playback devices, in-vehicle wireless terminal devices, wireless terminals, mobile stations, laptop embedded devices (LEEs), laptop mounted devices (LMEs), USB dongles, smart devices, wireless Consumer Premise Equipment (CPE), internet of things (IoT) devices, watches or other wearable devices, head Mounted Displays (HMDs), vehicles, drones, medical devices and applications (e.g., tele-surgery), industrial devices and applications (e.g., robots and/or other wireless devices operating in an industrial and/or automated processing chain environment), consumer electronics devices, devices operating in commercial and/or industrial wireless networks, and the like. In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" may be used interchangeably.

As described above, in the latest 3GPP specifications (i.e., release 16), agreement has been made on: the type II CSI report may be extended to a higher rank to support more data streams per UE for SU-MIMO or MU-MIMO transmission. However, the overhead of CSI reporting has a wider dynamic range due to the number of layers added for higher rank extension, the total number of NZ coefficients across layers, and the per-layer bitmap, etc. Thus, there is typically some difference between the resource allocation on PUSCH by the network device and the actual payload requirements for CSI reporting at the terminal device. How to deal with the situation where the allocated resource capacity is insufficient for CSI reporting becomes a hotspot.

In some conventional solutions, it is proposed to report type II CSI partially on PUSCH. In RANs 1#96bis and RANs 1#97, uplink Control Information (UCI) parameters have been agreed for MU-CSI. UCI parameters are divided into UCI part 1 (UCI part 1) and UCI part 2, UCI part 1 including the total number of NZ coefficients across layers, rank Indicator (RI), wideband Channel Quality Indicator (CQI), and subband CQI, UCI part 2 including bitmap per layer, strongest coefficient indicator per layer (SCI), spatial Domain (SD) base (base) subset selection indicator, SD oversampling factor, frequency Domain (FD) base subset selection indicator per layer, and non-zero Linear Combination (LC) coefficients, each non-zero LC coefficient including phase and amplitude excluding strongest coefficients. UCI part 1 is used to support decoding of UCI part 2 and has a higher transmission priority than UCI part 2. According to the release 15 omission rule, when the allocated resources are insufficient to contain all UCI part 2, CSI parameters in UCI part 2 are partially omitted in the order of priority shown in table 1.

TABLE 1 priority reporting levels for partial 2 CSI in Release 15

Wherein N is _Rep Is the number of CSI reports configured to be carried on PUSCH. Priority 0 is the highest priority, and priority 2N _Rep Is the lowest priority. The Subband (SB) CSI for each CSI report is divided into two separate levels, including even and odd SBs. Each priority level for Wideband (WB) or SB CSI has a certain payload size, depending on the indication of the number of WB coefficients of NZ per layer in UCI part 1 and the Rank Indicator (RI). The number of NZ coefficients is common to each subband in the layer according to the codebook employed in release 15. In case of ignoring transmission of odd SB of a certain CSI reportThe total number of NZ coefficients in even SBs of the CSI report is reduced to almost half per layer, and the payload size of the even SBs can still be determined by an indication of the number of NZ WB coefficients per layer in UCI part 1 and a Rank Indicator (RI).

However, in release 16, the type II CSI has been compressed by a Discrete Fourier Transform (DFT) based operation to exploit correlation in FD and reduce the number of significant coefficients required to describe the Precoder Matrix Indicator (PMI). After DFT-based FD compression, the reported LC coefficients are distributed in a two-dimensional matrix comprising transformed FD and SD. If the release 15 ignore rule is applied in release 16 type II CSI compression, the payload size for each priority of even or odd FD base vectors cannot be determined by the total number of identified cross-layer NZ coefficients in UCI part 1, as the total number of cross-layer NZ coefficients in even or odd FD base vectors needs to be determined from the UCI part 2 rather than from each bitmap indication in UCI part 1. In this case, a suitable ignore rule should be designed for version 16 to conveniently determine the payload size of the priority level and successfully perform transmission and determination of CSI.

Embodiments of the present disclosure provide a scheme for transmission and determination of CSI to at least partially address the above and other potential problems. Some example embodiments of the present disclosure will be described below with reference to the accompanying drawings. However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes as the disclosure extends beyond these limited embodiments.

Fig. 1 illustrates an example communication network 100 in which implementations of the present disclosure may be implemented. The communication network 100 includes a plurality of first devices 110-1, 110-2, … …, and 110-N, which may be collectively or individually referred to as "first device(s)" 110 and second device 120 serving the first device 110. The network 100 may provide one or more cells 102 to serve the first device 110. It should be understood that the number of first devices, second devices and/or cells is given for illustration purposes and does not imply any limitation to the present disclosure. Communication network 100 may include any suitable number of first devices, second devices, and/or cells suitable for implementing implementations of the present disclosure. Preferably, the first device is a terminal device and the second device is a network device.

In the communication network 100, the first device 110 may transmit data and control information to the second device 120, and the second device 120 may also transmit data and control information to the first device 110. The link from the first device 110 to the second device 120 is referred to as the Uplink (UL) and the link from the second device 120 to the first device 110 is referred to as the Downlink (DL).

Communications in network 100 may conform to any suitable standard including, but not limited to, global system for mobile communications (GSM), long Term Evolution (LTE), evolved LTE, LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), code Division Multiple Access (CDMA), GSM EDGE Radio Access Network (GERAN), and the like. Further, the communication may be performed according to any generation communication protocol currently known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols.

To obtain one or more CSI reports for a communication channel between the first device 110 and the second device 120 (e.g., for one or more frequency bands), the second device 120 may send a channel state information reference signal (CSI-RS) to the first device 110. The first device 110 may receive the CSI-RS from the second device 120 and obtain channel information by measuring the CSI-RS. The first device 110 may then determine a CSI report for the communication channel based on the obtained channel information and the corresponding codebook. For example, the obtained channel information may be quantized to CSI based on a corresponding codebook. The first device 110 may report CSI to the second device 120. A set of CSI parameters for a channel band is also referred to as a "CSI report". The CSI report may guarantee reliability of wireless communication between the first device 110 and the second device 120. It should be noted that embodiments of the present disclosure are also applicable to other suitable scenarios involving multiple second devices. In this case, the CSI report may correspond to reporting CSI for channels between the first device 110 and the plurality of second devices.

Fig. 2 shows a schematic diagram of a process 200 for CSI reporting according to an example embodiment of the present disclosure. For discussion purposes, process 200 will be described with reference to FIG. 1. The process 200 may involve the first device 110 and the second device 120 as illustrated in fig. 1.

As shown in fig. 2, the first device 110 may determine 210 a set of CSI reports for a channel between the first device 110 and the second device 120. In some example embodiments, the set of CSI reports may comprise a single CSI report. In some example embodiments, the set of CSI reports may include two or more different CSI reports.

In some example embodiments, each CSI report may have a different priority for transmission. In some example embodiments, each CSI report may include first information regarding a first set of parameters to be transmitted and second information regarding a second set of parameters that may be selectively transmitted. In some example embodiments, the first set of parameters may include at least one of an SD base subset selection indicator, an SD oversampling factor, an FD base subset selection per layer indicator, and an SCI per layer. In some example embodiments, the second set of parameters may include at least one of a per-layer map and non-zero LC coefficients, each non-zero LC coefficient including a phase and an amplitude excluding the strongest coefficient. It is noted that the partitioning of the first set of parameters and the second set of parameters is not limited to the examples described above, and may be performed in any suitable manner. In addition, the first and second sets of parameters may also include any other suitable parameters known in the art or developed in the future.

In some example embodiments, the second information may be divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission that is lower than the first priority. In some example embodiments, the second information is uniformly divided into the first portion and the second portion on a frequency domain basis or a spatial domain basis. In some example embodiments, the second information may include a bitmap indication in the form of a two-dimensional matrix including the transformed FD and SD for each layer. In some example embodiments, the first portion and the second portion may correspond to an upper half and a lower half of the matrix. In some example embodiments, the first portion and the second portion may correspond to a left half and a right half of the matrix. In some example embodiments, the first portion and the second portion may correspond to even and odd transformed FD basis vectors of the matrix. It is noted that the division of the first and second portions is not limited to the examples described above, and may be performed in any suitable manner. For convenience, the following description is made with reference to division of FD base vectors after even and odd transform.

For example, when the allocated resources are insufficient to contain all UCI part 2, CSI parameters in UCI part 2 may be partially ignored with respect to the priority order shown in table 2.

TABLE 2 priority reporting level of 2 nd partial CSI in 16 th edition

Wherein N is _Rep Is the number of CSI reports configured to be carried on PUSCH in one slot. Priority 0 is the highest priority, priority 2N _Rep Is the lowest priority.

In this example, the first and second information of each CSI report is also referred to as the base CSI and the transform domain CSI. Further, for the second information, each CSI report has a first part as an even FD base vector and a second part as an odd FD base vector. In the case of a single CSI report, the parameters and payload sizes of the base CSI and the transform domain CSI are described in table 3.

TABLE 3 UCI 2 nd partial CSI parameters in a single CSI report

First device 110 may determine 220 a CSI report from the set of CSI reports for which second information is to be transmitted in part. In some example embodiments, first device 110 may determine the CSI report based on the PUSCH resources allocated for the CSI report and the payload size of the CSI report for the respective priority.

In some example embodiments, assume that RA is the size of PUSCH resources allocated for CSI reporting purposes, S ₀ Is for all N _Rep Payload size, S, of priority 0 (base CSI) of individual CSI reports _n，0 Is the payload size of priority 2N-1 (even FD base vector) for CSI report N, (n=1, …, N) _Rep )，S _n，1 Is the payload size of priority 2N (odd FD base vector) for CSI report N, (n=1, …, N) _Rep )，S _n ＝S _n，0 +S _n，1 Is the total payload size of CSI report n, including priority 2n-1 and priority 2n, ri _n Is for reporting the number of layers, K, of n for CSI _NZ，n Is the total number of NZ coefficients across layers for CSI report n, and K _{NZ，even，n} Is the total number of NZ coefficients for the cross-layer of CSI report n in the even FD base vector.

From table 3, the relevant payload size can be calculated as follows.

S _n ＝7K _NZ，n +53RI _n (2)

S _n，0 ＝7K _{NZ，even，n} +29RI _n (3)

From equations (1) and (2) above, it can be seen that S for all CSI reports ₀ Related only to RI reported in UCI part 1, and S _n Is determined by the total number of NZ coefficients for the cross-layer specified in UCI part 1 for CSI report n and RI. They are thus determined values known to the first device and the second device side.

However, as can be seen from equation (3), according to UCI section 1, S _n，0 Is unknown because the total number of NZ coefficients K of the cross-layer in the even FD base vectors _{NZ，even，n} It needs to be calculated from the per-layer bitmap in UCI part 2 instead of UCI part 1 for CSI report n. In this case, embodiments of the present disclosure provide a method of determining the payload size of even FD base vectors by adapting the allocated PUSCH resources when an ignore rule is triggered.

In some example embodiments, the first device 110 may determine CSI reports whose second information is to be partially transmitted according to equations (1) and (2). For example, ifThe first device 110 may determine N _U Is a CSI report in which the second information is partially transmitted. In this case, an ignore rule may be triggered, where priority 0 and index are less than N _U All CSI reports of all priority levels of (a) are reported with index greater than N _U All CSI reports for all priority levels of (c) are ignored. For CSI report N _U Its priority level 2N _U -1 (with even FD basis vector) is also reported, while its priority level 2N _U (with odd FDD basis vectors) is ignored.

After determining the CSI report whose second information is to be partially transmitted, first device 110 may determine 230 a total number of NZ coefficients for the cross-layer in the first portion of the determined CSI report (in this example, priority 2N _U Even FD base vectors in-1), i.e.In some example embodiments, CSI report N _U Priority 2N of (2) _U The payload size of-1 can be adjusted and adapted to the allocated PUSCH resource RA, and +.>Can be according to reporting N for CSI _U Is calculated by the following equation (4).

After determining the total number of NZ coefficients for the cross-layer in the first portion, the first device 110 may determine 240 a payload size of the determined first portion of the CSI report based on the determined total number of NZ coefficients In some example embodiments, the first device 110 may determine the determined CSI report N according to the following equation (5) _U Payload size of the first portion of (a).

In some embodiments, the first device 110 may first be based on the total number of NZ coefficientsTo determine if the first part can be transmitted, and then if the first part can be transmitted, to determine the payload size +.>In some embodiments, if the total number of NZ coefficients +.>Exceeding the number of layers involved in the determined CSI report +.>The first device 110 may determine that the first portion may be transmitted. If the total number of NZ coefficients +.>Below the layer teaching involved in the determined CSI report>The first device 110 may determine that the first portion is not necessarily transmitted. At the position ofIn the case of (i), i.e. for CSI report N _U Only the strongest coefficients are present for each layer of (i.e. first part) priority 2N _U The transmission of-1 should also be ignored.

After determining the payload size of the first portion, the first device 110 may transmit 250 the determined first portion of the CSI report to the second device 120 based on the determined payload size of the first portion. In some example embodiments, the first device 110 may also transmit the first information of CSI reports 1 through N and have a CSI report N determined by the ratio _U Higher priority CSI reports 1 through N _U -second information of 1. At the same time, reporting N for the determined CSI is ignored _U And a CSI report N having a lower priority than the determined CSI report _U Transmission of the second information of +1. It should be noted that the first information (i.e., the base CSI) on all CSI reports is always transmitted with the highest priority.

In some example embodiments, ifThe first device 110 may transmit the entire 2 nd partial CSI including all priority levels to the second device 120 without triggering the ignore rule. In some example embodiments, if RA < S ₀ The first device 110 may not transmit the priority level of the 2 nd partial CSI.

In some example embodiments, the first device 110 may transmit a set of CSI reports with partial omission to the second device 120 in a data stream. Thus, as shown in fig. 2, in response to receiving a data stream for the set of CSI reports, second device 120 may determine 260 a CSI report from the set of CSI reports from which second information was partially transmitted. In some embodiments, for example, the second device 120 may be based on PUSCH resources allocated for CSI reportingAnd the payload size of the CSI report of each priority to determine the CSI report N whose second information is partially transmitted _U . This may be accomplished through a process similar to that of the CSI report, the second information of which is partially transmitted by the first device 110, which is not described in detail herein.

CSI report N in determining that its second information is partially transmitted _U Thereafter, the second device 120 may determine 270 the determined CSI report N _U The total number of NZ coefficients of the cross-layer in the first part of (a), i.eIn some example embodiments, N may be reported for CSI according to equation (4) above _U Calculate->Then, the second device 120 may be based on the determined total number of non-zero coefficients +.>To determine 280 the determined CSI report N _U Payload size of the first part of (2)>In some example embodiments, the second device 120 may determine the determined CSI report N according to equation (5) above _U Payload size of the first portion of (a).

After determining the payload size, the second device 120 may determine 290 the determined CSI report N from the data stream based on the payload size _U Is a first part of the second part. In some embodiments, for example, according to equations (1) and (2) above, the second device 120 may also determine the payload size of the first information for all CSI reports 1 through N and have a smaller than the determined CSI report N _U Higher priority CSI reports 1 through N _U -payload size of the second information of 1.

It should be noted that the above equations (1) - (5) are only for illustration, and do not limit the scope of the present application. Any other suitable embodiment is also suitable. Through the procedure shown in fig. 2, the payload size of the priority level of CSI can be conveniently determined through the allocated PUSCH resources without additional UCI part 1 design, and CSI can be successfully transmitted and determined.

Fig. 3 illustrates a flowchart of an example method 300 implemented at a first device, such as a terminal device, according to some embodiments of the disclosure. For discussion purposes, the method 300 will be described with reference to fig. 1 from the perspective of the first device 110. It should be understood that method 300 may also include additional blocks not shown and/or omit some of the blocks shown, and that the scope of the present disclosure is not limited in this respect.

At block 310, the first device 110 may determine a set of CSI reports for a channel between the first device 110 and the second device 120. Each CSI report has a different priority for transmission and includes first information regarding a first set of parameters that need to be transmitted and second information regarding a second set of parameters that may be selectively transmitted. The second information is divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority. In some example embodiments, the second information is uniformly divided into the first portion and the second portion on a frequency domain basis or a spatial domain basis.

In some example embodiments, the second information may include a bitmap indication in the form of a two-dimensional matrix including the transformed FD and SD. In some example embodiments, the first portion and the second portion may correspond to an upper half and a lower half of the matrix. In some example embodiments, the first portion and the second portion may correspond to a left half and a right half of the matrix. In some example embodiments, the first portion and the second portion may correspond to FD base vectors of even and odd transforms of the matrix. It is noted that the division of the first and second portions is not limited to the examples described above, and may be performed in any suitable manner.

In some example embodiments, the first set of parameters may include at least one of a spatial domain base subset selection indicator, a spatial domain oversampling factor, a per-layer frequency domain base subset selection indicator, and a strongest coefficient indicator per layer. In some example embodiments, the second set of parameters may include at least one of a bitmap and non-zero linear combination coefficients for each layer, each non-zero linear combination coefficient including a phase and an amplitude excluding the strongest coefficient. It is noted that the partitioning of the first set of parameters and the second set of parameters is not limited to the examples described above, and may be performed in any suitable manner. In addition, the first and second sets of parameters may also include any other suitable parameters known in the art or developed in the future.

At block 320, first device 110 may determine a CSI report from a set of CSI reports for which second information is to be transmitted in part. In some example embodiments, the first device 110 may obtain resources (e.g., RA) allocated for the set of CSI reports from the second device 120, e.g., via Radio Resource Control (RRC) signaling. The first device 110 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S ₀ ). For example, the first device 110 may determine S according to equation (1) above ₀ . First device 110 may determine a payload size of second information for each CSI report in the set of CSI reports as a plurality of second values (e.g., S _n ). For example, the first device 110 may determine S according to equation (2) above _n . First device 110 may then determine a CSI report (e.g., CSI report N) based on the size of the resource, the first value, the plurality of second values, and the priority of each of the set of CSI reports _U )。

At block 330, the first device 110 may determine a total number of non-zero coefficients across the channel layer in the determined first portion of the CSI report (e.g.,). In some example embodiments, first device 110 may obtain, from second device 120, the allocated resources (e.g., RA) for the set of CSI reports and determine a sum of payload sizes of first information for the set of CSI reports as a first value (e.g., S ₀ ). The first device 110 may determine a sum of payload sizes of the second information for CSI reports having a higher priority than the determined CSI report as a third value (e.g.,). The first device 110 may determine the number of layers (e.g., + for the channels involved in the determined CSI report>). First device 110 may determine a total number of non-zero coefficients for the cross-layer in the determined CSI report (e.g., +.>). The first device 110 may determine a total number of non-zero coefficients in the first portion based on the size of the resource, the first value, the third value, the number of layers, and the total number of non-zero coefficients for the determined cross-layer of the CSI report (e.g.>). In some example embodiments, first device 110 may determine +_ according to equation (4) above>

At block 340, first device 110 may determine a payload size of the determined first portion of the CSI report based on a total number of non-zero coefficients in the determined first portion. In some example embodiments, the first device 110 may determine the payload size of the determined first portion of the CSI report according to equation (5) above.

In some example embodiments, the first device 110 may determine whether the first portion may be transmitted based on the total number of non-zero coefficients in the first portion and the number of layers of the channel involved in the determined CSI report, and in response to determining that the first portion may be transmitted, the first device 110 may determine the payload size. In some example embodiments, the first device 110 may determine whether the total number of non-zero coefficients in the first portion exceeds the number of layers of the channel involved in the determined CSI report, and in response to the total number of non-zero coefficients in the first portion exceeding the number of layers of the channel involved in the determined CSI report, the first device 110 may determine that the first portion may be transmitted. The first device 110 may determine that the first portion is not necessarily transmitted if the total number of NZ coefficients in the first portion is less than or equal to the number of layers involved in the determined CSI report. In this way, the efficiency of CSI transmission may be improved.

At block 350, the first device 110 may send the determined first portion of the CSI report to the second device 120 based on the payload size. In some example embodiments, first device 110 may also send to second device 120 first information for a set of CSI reports and second information for CSI reports having a higher priority than the determined CSI reports. Meanwhile, transmission of the second part for the determined CSI report and transmission of the second information of the CSI report having a lower priority than the determined CSI report are ignored. In some example embodiments, the first device 110 may also send first information about all CSI reports with the highest priority for transmission to the second device 120.

By the method of fig. 3, the payload size of the priority level can be conveniently determined through the allocated PUSCH resources without additional UCI part 1 design, thereby conveniently and correctly implementing CSI transmission.

Fig. 4 illustrates a flowchart of an example method 400 implemented at a second device, such as a network device, according to some embodiments of the disclosure. For discussion purposes, the method 400 will be described with reference to fig. 1 from the perspective of the second device 120. It should be understood that method 400 may also include additional blocks not shown and/or omit some of the blocks shown, and that the scope of the present disclosure is not limited in this respect.

At block 410, the second device 120 may receive a set of CSI reported data streams from the first device 110 for a channel between the second device 120 and the first device 110. Each CSI report has a different priority for transmission and includes first information regarding a first set of parameters that need to be transmitted and second information regarding a second set of parameters that may be selectively transmitted. The second information is divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority. In some example embodiments, the second information is uniformly divided into the first portion and the second portion on a frequency domain basis or a spatial domain basis.

In some example embodiments, the first set of parameters may include at least one of a spatial domain base subset selection indicator, a spatial domain oversampling factor, a per-layer frequency domain base subset selection indicator, and a per-layer strongest coefficient indicator. In some example embodiments, the second set of parameters may include at least one of a per-layer bitmap and non-zero linear combination coefficients, each non-zero linear combination coefficient including a phase and an amplitude excluding the strongest coefficient. It is noted that the partitioning of the first set of parameters and the second set of parameters is not limited to the examples described above, and may be performed in any suitable manner. In addition, the first and second sets of parameters may also include any other suitable parameters known in the art or developed in the future.

At block 420, the second device 120 may determine a CSI report from a set of CSI reports whose second information is partially transmitted. In some example embodiments, the second device 120 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S ₀ ). For example, the second device 120 may determine S according to equation (1) above ₀ . The second device 120 may determine a payload size of the second information for each of the set of CSI reports as a plurality of second values (e.g., S _n ). For example, the second device 120 may determine S according to equation (2) above _n . Second device 120 may then determine a CSI report (e.g., CSI report N) based on the size of the resources allocated for the CSI report, the first value, the plurality of second values, and the priority of each of the set of CSI reports _U )。

At block 430, the second device 120 may determine a total number of non-zero coefficients across the channel layer in the determined first portion of the CSI report (e.g.,). In some example embodiments, the second device 120 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S ₀ ). The second device 120 may determine a sum of payload sizes of the second information for CSI reports having higher priority than the determined CSI report as a third value (e.g.>). The second device 120 may determine the number of layers of the channel involved in the determined CSI report (e.g. +.>). The second device 120 may determine a total number of cross-layer non-zero coefficients in the determined CSI report (e.g.)>). Second device 120 may determine a total number of non-zero coefficients in the first portion based on the size of the allocated resources for CSI reporting, the first value, the third value, the number of layers, and the total number of non-zero coefficients for the determined cross-layer of CSI reporting (e.g. >). In some example embodiments, second device 120 may determine +_ according to equation (4) above>

At block 440, the second device 120 may determine a payload size of the determined first portion of the CSI report based on the total number of non-zero coefficients in the determined first portion. In some example embodiments, the second device 120 may determine the payload size of the determined first portion of the CSI report according to equation (5) above.

In some example embodiments, the second device 120 may determine whether the first portion is transmitted based on a total number of non-zero coefficients in the first portion and a number of layers of channels involved in the determined CSI report, and in response to determining that the first portion is transmitted, the second device 120 may determine a payload size. In some example embodiments, the second device 120 may determine whether the total number of non-zero coefficients exceeds the number of layers of the channel involved in the determined CSI report, and in response to the total number of non-zero coefficients exceeding the number of layers of the channel involved in the determined CSI report, the second device 120 may determine that the first portion is transmitted. The second device 120 may determine that the first portion is not transmitted if the total number of NZ coefficients in the first portion is less than or equal to the number of layers involved in the determined CSI report.

At block 450, the second device 120 may determine a first portion of the determined CSI report from the data stream based on the payload size. In some example embodiments, second device 120 may also determine, from the data stream, first information for a set of CSI reports and second information for CSI reports having a higher priority than the determined CSI reports. Meanwhile, transmission of the second part for the determined CSI report and transmission of the second information of the CSI report having a lower priority than the determined CSI report are ignored. In some example embodiments, the second device 120 may also determine first information about all CSI reports with the highest priority for transmission from the data stream.

By the method of fig. 4, the payload size of the priority level can be conveniently determined through the allocated PUSCH resources without additional UCI part 1 design, so that CSI can be conveniently and correctly determined.

In some embodiments, an apparatus (e.g., first device 110) capable of performing method 300 may include means for performing the various steps of method 300. The component may be implemented in any suitable manner. For example, the components may be implemented in a circuit or software module.

In some embodiments, the apparatus comprises: means for determining, by a first device, a set of Channel State Information (CSI) reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that need to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission that is lower than the first priority; means for determining CSI reports from the set of CSI reports for which second information is to be partially transmitted; means for determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; means for determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and means for transmitting the determined first portion of the CSI report to the second device based on the payload size.

In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 300. In some embodiments, the component includes at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause execution of the apparatus.

In some embodiments, an apparatus (e.g., second device 120) capable of performing method 400 may include means for performing the various steps of method 400. The component may be implemented in any suitable manner. For example, the components may be implemented in a circuit or software module.

In some embodiments, the apparatus comprises: means for receiving, by a second device and from a first device served by the second device, a data stream relating to a set of Channel State Information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information relating to a first set of parameters that need to be transmitted and second information relating to a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority; means for determining a CSI report from the set of CSI reports whose second information is partially transmitted; means for determining a total number of non-zero coefficients across the channel layers in the determined first portion of the CSI report; means for determining a payload size of the first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and means for determining a first portion of the determined CSI report from the data stream based on the payload size.

In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 400. In some embodiments, the component includes at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause execution of the apparatus.

Fig. 5 is a simplified block diagram of an apparatus 500 suitable for implementing embodiments of the present disclosure. The device 500 may be provided to implement a communication device, such as the first device 110 or the second device 120 shown in fig. 1. As shown, the device 500 includes one or more processors 510, one or more memories 520 coupled to the processors 510, and one or more communication modules 540 (e.g., a transmitter and/or a receiver) coupled to the processors 510.

The communication module 540 is used for two-way communication. The communication module 540 has at least one antenna to facilitate communication. The communication interface may represent any interface required to communicate with other network elements.

Processor 510 may be of any type suitable for use in a local technology network and may include, by way of non-limiting example, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital Signal Processors (DSPs), and processors based on a multi-core processor architecture. The device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock that is synchronized to the master processor.

Memory 520 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memory include, but are not limited to, read-only memory (ROM) 524, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact Disks (CD), digital Video Disks (DVD), and other magnetic and/or optical storage. Examples of volatile memory include, but are not limited to, random Access Memory (RAM) 522 and other volatile memory that does not last for the duration of the power outage.

The computer program 530 includes computer-executable instructions that are executed by an associated processor 510. Program 530 may be stored in ROM 524. Processor 510 may perform any suitable actions and processes by loading program 530 into RAM 522.

Embodiments of the present disclosure may be implemented by means of program 530 such that device 500 may perform any of the processes of the present disclosure as discussed with reference to fig. 2-4. Embodiments of the present disclosure may also be implemented in hardware or in a combination of hardware and software.

In some embodiments, program 530 may be tangibly embodied in a computer-readable medium that may be included in device 500 (such as in memory 520) or other storage device accessible to device 500. Device 500 may load program 530 from a computer readable medium into RAM 522 for execution. The computer readable medium may include any type of tangible, non-volatile memory, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. Fig. 6 shows an example of a computer readable medium 600 in the form of a CD or DVD. The computer readable medium has a program 530 stored thereon.

In general, the various embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of the embodiments of the disclosure are illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor to perform the method 300 as described above with reference to fig. 3 and/or the method 400 as described above with reference to fig. 4. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between program modules as desired. Machine-executable instructions for program modules may be executed within a local device or within a distributed device. In distributed devices, program modules may be located in both local and remote memory storage media.

Program code for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable an apparatus, device, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like.

The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some scenarios, multitasking and parallel processing may be advantageous. Also, while the above discussion contains several specific implementation details, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for communication, comprising:

determining, by a first device, a set of Channel State Information (CSI) reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first portion and a second portion, the first portion having a first priority for transmission, the second portion having a second priority for transmission that is lower than the first priority;

determining a CSI report from the set of CSI reports for which the second information is to be partially transmitted;

determining a total number of non-zero coefficients across layers of the channel in the determined first portion of the CSI report;

determining a payload size of the determined first portion of the CSI report based on a total number of the non-zero coefficients determined in the first portion; and

the determined first portion of the CSI report is sent to the second device based on the payload size.

2. The method of claim 1, further comprising: transmitting the first information of the set of CSI reports and the second information of CSI reports having higher priority than the determined CSI reports to the second device, and

wherein the following are ignored: the method further includes transmitting the second portion for the determined CSI report and transmitting the second information for a CSI report having a lower priority than the determined CSI report.

3. The method of claim 1, wherein determining the CSI report comprises:

obtaining, from the second device, a size of resources allocated for the set of CSI reports;

determining a sum of payload sizes of the first information for the set of CSI reports as a first value;

determining a payload size of the second information for each CSI report in the set of CSI reports as a plurality of second values; and

the CSI report is determined based on the size of the resource, the first value, the plurality of second values, and a priority for each CSI report in the set of CSI reports.

4. The method of claim 1, wherein determining a total number of the non-zero coefficients in the determined first portion of the CSI report comprises:

determining a sum of payload sizes of the second information for CSI reports having a higher priority than the determined CSI report as a third value;

determining the number of layers of the channel involved in the determined CSI report;

determining a total number of non-zero coefficients across layers for the determined CSI report; and

a total number of the non-zero coefficients in the first portion is determined based on the size of the resource, the first value, the third value, the number of the layers, and a total number of the non-zero coefficients across layers for the determined CSI report.

5. The method of claim 1, wherein determining the payload size comprises:

determining whether the first portion is capable of being transmitted based on a total number of the non-zero coefficients in the first portion and the determined number of the layers of the channel involved in the CSI report; and

In response to determining that the first portion can be transmitted, the payload size is determined based on a total number of the non-zero coefficients in the first portion and the number of the layers for the determined CSI report.

6. The method of claim 5, wherein determining whether the first portion can be transmitted comprises:

determining whether the total number of the non-zero coefficients in the first portion exceeds the determined number of the layers of the channel involved in the CSI report; and

in response to the total number of the non-zero coefficients in the first portion exceeding the determined number of the layers of the channel involved in the CSI report, it is determined that the first portion is capable of being transmitted.

7. The method of any of claims 1-6, wherein the first set of parameters includes at least one of: a spatial domain base subset selection indicator, a spatial domain oversampling factor, a frequency domain base subset selection indicator for each layer, and a strongest coefficient indicator for each layer; and is also provided with

Wherein the second set of parameters includes at least one of a bitmap and non-zero linear combination coefficients for each layer, each of the non-zero linear combination coefficients including a phase and an amplitude that excludes the strongest coefficient for each layer.

8. The method of any of claims 1-6, wherein the second information is evenly divided into the first portion and the second portion on a frequency domain basis or a spatial domain basis.

9. The method of any of claims 1-6, wherein the first device is a terminal device and the second device is a network device.

10. A method for communication, comprising:

receiving, by a second device, a data stream from a first device served by the second device, the data stream regarding a set of Channel State Information (CSI) reports for channels between the second device and the first device, each CSI report having a different priority for transmission and including first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission that is lower than the first priority;

determining a CSI report from the set of CSI reports in which the second information is partially transmitted;

determining a payload size of the determined first portion of the CSI report based on the total number of non-zero coefficients determined in the first portion; and

the first portion of the determined CSI report is determined from the data stream based on the payload size.

11. The method of claim 10, further comprising: determining from the data stream the first information of the set of CSI reports and the second information of CSI reports having a higher priority than the determined priority of the CSI reports, and

12. The method of claim 10, wherein determining the CSI report comprises:

The CSI report is determined based on a size of resources allocated for the set of CSI reports, the first value, the plurality of second values, and a priority for each CSI report in the set of CSI reports.

13. The method of claim 10, wherein determining a total number of the non-zero coefficients in the determined first portion of the CSI report comprises:

determining a sum of payload sizes of the second information for other CSI reports having a higher priority than the determined priority of the CSI report as a third value;

the total number of non-zero coefficients in the first portion is determined based on a size of resources allocated for the set of CSI reports, the first value, the third value, the number of layers, and a total number of non-zero coefficients across layers for the determined CSI report.

14. The method of claim 10, wherein determining the payload size comprises:

determining whether the first portion is transmitted based on a total number of the non-zero coefficients in the first portion and the determined number of the layers of the channel involved in the CSI report; and

in response to determining that the first portion is transmitted, the payload size is determined based on the total number of the non-zero coefficients in the first portion and the number of the layers for the determined CSI report.

15. The method of claim 14, wherein determining whether the first portion is transmitted comprises:

determining whether a total number of the non-zero coefficients in the first portion exceeds the determined number of the layers of the channel involved in the CSI report; and

in response to a total number of the non-zero coefficients in the first portion exceeding the determined number of the layers of the channel involved in the CSI report, determining that the first portion is transmitted.

16. The method of any one of claims 10-15, wherein the first set of parameters includes at least one of: a spatial domain base subset selection indicator, a spatial domain oversampling factor, a frequency domain base subset selection indicator for each layer, and a strongest coefficient indicator for each layer; and is also provided with

17. The method of any of claims 10-15, wherein the second information is evenly divided into the first portion and the second portion on a frequency domain basis or a spatial domain basis.

18. The method of any of claims 10-15, wherein the first device is a terminal device and the second device is a network device.

19. An apparatus for communication, comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

20. An apparatus for communication, comprising:

at least one processor; and

at least one memory including computer program code;

receiving, by a second device, a data stream from a first device served by the second device, the data stream regarding a set of Channel State Information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and including first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second set of parameters including a first portion having a first priority for transmission and a second portion having a second priority for transmission that is lower than the first priority;

21. An apparatus for communication, comprising:

means for determining, by a first device, a set of Channel State Information (CSI) reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information regarding a first set of parameters that are required to be transmitted and second information regarding a second set of parameters that can be selectively transmitted, the second information being divided into a first portion and a second portion, the first portion having a first priority for transmission, the second portion having a second priority for transmission that is lower than the first priority;

Means for determining a CSI report from the set of CSI reports for which the second information is to be partially transmitted;

means for determining a total number of non-zero coefficients across layers of the channel in the determined first portion of the CSI report;

means for determining a payload size of the determined first portion of the CSI report based on a total number of the non-zero coefficients determined in the first portion; and

means for transmitting the determined first portion of the CSI report to the second device based on the payload size.

22. An apparatus for communication, comprising:

means for receiving, by a second device, a data stream from a first device served by the second device, the data stream relating to a set of Channel State Information (CSI) reports for channels between the second device and the first device, each CSI report having a different priority for transmission and comprising first information relating to a first set of parameters that are required to be transmitted and second information relating to a second set of parameters that can be selectively transmitted, the second information being divided into a first part having a first priority for transmission and a second part having a second priority for transmission that is lower than the first priority;

Means for determining a CSI report from the set of CSI reports in which the second information is partially transmitted;

means for determining a payload size of the determined first portion of the CSI report based on the total number of non-zero coefficients determined in the first portion; and

means for determining the determined first portion of the CSI report from the data stream based on the payload size.

23. A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of claim 1 or 10.