CN114008947A

CN114008947A - Transmission and determination of channel state information

Info

Publication number: CN114008947A
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: 2022-02-01
Anticipated expiration: 2039-06-19
Also published as: WO2020252691A1; CN114008947B

Abstract

Embodiments of the present disclosure relate to methods, devices, apparatuses, 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 including first information regarding a first set of parameters required to be transmitted and second information regarding a second set of parameters that may 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. The first device determines a CSI report from the set of CSI reports for which the second information is to be partially transmitted, determines a total number of non-zero coefficients across channel layers in a first portion of the determined CSI report; determining a payload size of a first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and transmitting a first portion of the determined 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 a first portion from the data stream in a similar manner. In this way, the payload size of the priority level of the CSI may be conveniently determined by the allocated resources without an additional UCI part 1 design, and the CSI may 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, to methods, devices, apparatuses, and computer-readable storage media for transmission and determination of Channel State Information (CSI).

Background

In the latest 3GPP specification (i.e., release 16), agreement has been made as follows: type II CSI reports, which are designed for lower ranks, such as Rank Indication (RI) (Rank Indication) 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) transmissions.

The rank may indicate the number of independent transmission layers supported in the communication channel. The overhead of CSI reporting has a wide dynamic range due to the dependence on the number of layers added for higher rank extension, the total number of non-zero (NZ) coefficients across layers, and per-layer bitmaps, etc. Thus, there is typically some difference between the network device's resource allocation 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 that the allocated resource capacity is not enough for CSI reporting becomes a hot spot.

Disclosure of Invention

In general, example embodiments of the present disclosure provide a solution for the 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 on a first set of parameters required to be sent and second information on a second set of parameters that may be selectively sent, 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 of which second information is to be partially transmitted from the set of CSI reports; determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; determining a payload size of a first portion of the determined CSI report based on a total number of non-zero coefficients; and transmitting a first portion of the determined 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 a 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 including first information regarding a first set of parameters required to be transmitted and second information regarding a second set of parameters that may 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 of which second information is partially transmitted from the set of CSI reports; determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; determining a payload size of a 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 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 including information about a first set of parameters required to be sent and information about a second set of parameters that can be selectively sent, the 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 of which second information is to be partially transmitted from the set of CSI reports; determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; determining a payload size of a first portion of the determined CSI report based on a total number of the determined non-zero coefficients in the first portion; and transmitting a first portion of the determined 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 configured to, with the at least one processor, cause the apparatus to: receiving, by a 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 first set of parameters required to be necessarily transmitted and second information regarding a second set of parameters that may 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, from the set of CSI reports, a CSI report whose second information is partially transmitted; determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; determining a payload size of a 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 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; means for determining, from the set of CSI reports, a CSI report whose second information is to be partially transmitted; means for determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; means for determining a payload size of a 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 a first portion of the determined CSI report to a second device based on the payload size.

In a sixth aspect, there is provided an apparatus comprising: means for receiving, by a 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 first set of parameters that need to be necessarily 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, from the set of CSI reports, a CSI report whose second information is partially transmitted; means for determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; means for determining a payload size of a 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 a method according to the first or second aspect.

It should be understood that this 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 readily 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 flow chart of a method implemented at a first device according to an example embodiment of the present disclosure;

fig. 4 illustrates a flow chart 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 implementing an example embodiment 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.

Throughout the drawings, the same or similar reference numerals denote the same or similar elements.

Detailed Description

The principles of the present disclosure will now be described with reference to a few exemplary embodiments. It is understood that these embodiments are described solely for the purposes of illustration and to assist those skilled in the art in understanding and practicing the disclosure, and are not intended to imply any limitations on the scope of the 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. Further, 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 affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It will be understood that, although the terms first, 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. 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," "having" and/or "including," 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) hardware-only 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) a combination of analog and/or digital hardware circuit(s) and software/firmware, and

(ii) any portion of hardware processor(s) with software (including digital signal processors), 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 a portion of microprocessor(s), that require software (e.g., firmware) to operate, but which may not be present when they are not required for operation.

This definition of circuitry applies to all uses of the term in this application, including all uses in any claims. As a further example, as used in this application, the term circuitry also encompasses implementations in which only a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. By way of example, and where applicable to particular claim elements, the term circuitry also encompasses baseband or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or network devices.

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 so forth. Further, 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 to various communication systems. Given the rapid development of communications, there will of course also be future types of communication techniques and systems that may embody the present disclosure. And should not be taken as limiting the scope of the 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), e.g., a NodeB (NodeB or NB), evolved NodeB (eNodeB or eNB), NRNB (also known as gNB), Remote Radio Unit (RRU), Radio Head (RH), Remote Radio Head (RRH), relay, low power node (such as 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 installed devices (LMEs), USB dongles, smart devices, wireless Customer Premises 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 industrial and/or automated processing chain environments), 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 specification (i.e., release 16), the following has been agreed: the type II CSI report may be extended to higher ranks in order to support more data streams per UE for SU-MIMO or MU-MIMO transmission. However, 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 NZ coefficients across layers, and per-layer bitmaps, etc. Therefore, 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 that the allocated resource capacity is not enough for CSI reporting becomes a hot spot.

In some conventional solutions, it is proposed to partially report type II CSI on PUSCH. In RAN1#96bis and RAN1#97, Uplink Control Information (UCI) parameters have been agreed for MU-CSI. The 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 per-layer bitmap, per-layer Strongest Coefficient Indicator (SCI), Spatial Domain (SD) basis (basis) subset selection indicator, SD oversampling factor, per-layer Frequency Domain (FD) basis subset selection indicator, and non-zero Linear Combination (LC) coefficients, each non-zero LC coefficient including phase and amplitude excluding the strongest coefficient. The UCI part 1 is used to support decoding of the UCI part 2 and has a higher transmission priority than the UCI part 2. According to the release 15 ignore rule, when the allocated resources are not enough to contain all UCI part 2, the CSI parameters in the UCI part 2 are partially ignored in the priority order shown in table 1.

TABLE 1 PRIORITY REPORTING LEVELS FOR PARTIAL 2 CSI IN RELEASE 15

Wherein N is_RepIs the number of CSI reports configured to be carried on the PUSCH. Priority 0 is the highest priority, and priority 2N_RepIs 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, in particular depending on an indication of the number of WB coefficients per layer of NZ in the UCI part 1 and a Rank Indicator (RI). According to the codebook employed in release 15, the number of NZ coefficients is common to each subband in the layer. In case of ignoring the transmission of odd SBs for a certain CSI report, the total number of NZ coefficients in even SBs for this CSI report is reduced to almost half per layer, and the payload size of even SBs can still be determined by the indication of the number of NZ WB coefficients per layer in the UCI part 1 and the Rank Indicator (RI).

However, in release 16, the type II CSI has been compressed by Discrete Fourier Transform (DFT) -based operations to exploit the correlation in FD and reduce the number of significant coefficients needed to describe 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 the release 16 type II CSI compression, the payload size per priority for the even or odd FD basis vectors cannot be determined by the total number of cross-layer NZ coefficients identified in the UCI part 1, since the total number of cross-layer NZ coefficients in the even or odd FD basis vectors needs to be determined from the UCI part 2 instead of the per-layer bitmap indication in the UCI part 1. In this case, a suitable ignoring rule should be designed for release 16 in order 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 a 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 are given for illustrative purposes and do not imply any limitations 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 an Uplink (UL), and the link from the second device 120 to the first device 110 is referred to as a 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 so forth. Further, the communication may be performed according to any generational 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, and fifth generation (5G) communication protocols.

To obtain one or more CSI reports for a communication channel (e.g., for one or more frequency bands) between the first device 110 and the second device 120, 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 into CSI based on the corresponding codebook. The first device 110 may report CSI to the second device 120. The set of CSI parameters for a channel band is also referred to as a "CSI report". The CSI report may guarantee the reliability of the wireless communication between the first device 110 and the second device 120. It is 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 purposes of discussion, the process 200 will be described with reference to fig. 1. Process 200 may involve first device 110 and 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 include 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 set selection indicator, an SD oversampling factor, a per-layer FD base set selection indicator, and a per-layer SCI. In some example embodiments, the second set of parameters may include at least one of a per-layer bitmap and non-zero LC coefficients, each non-zero LC coefficient including a phase and amplitude that excludes the strongest coefficient. It is noted that the division of the first set of parameters and the second set of parameters is not limited to the above examples and may be performed in any suitable way. Furthermore, the first set of parameters and the second set 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 lower than the first priority. In some example embodiments, the second information is uniformly divided into the first part and the second part on a frequency domain basis or a spatial domain basis. In some example embodiments, the second information may contain a bitmap indication in the form of a two-dimensional matrix including 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 above examples and may be performed in any suitable manner. For convenience, the following description is made with reference to the division of FD basis vectors after even and odd transform.

For example, when the allocated resources are insufficient to contain all the UCI part 2, the CSI parameters in the 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 CSI in 16 th edition

Wherein N is_RepConfigured as CSI report carried on PUSCH within one slotNumber of the cells. Priority 0 is the highest priority, priority 2N_RepIs the lowest priority.

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

TABLE 3 UCI part 2 CSI parameters in a single CSI report

The first device 110 may determine 220 a CSI report from the set of CSI reports whose second information is to be partially transmitted. In some example embodiments, the 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 of the respective priority.

In some example embodiments, it is assumed that RA is the size of PUSCH resources allocated for CSI reporting purposes, S₀Is directed to all N_RepPayload size, S, of priority 0 (basic CSI) of individual CSI reports_n，0Is the payload size of priority 2N-1 (even FD basis vector) for CSI report N, (N ═ 1, …, N_Rep)，S_n，1Is the payload size of priority 2N (odd FD basis vector) for CSI report N, (N-1, …, N_Rep)，S_n＝S_n，0+S_n，1Is the total payload size of the CSI report n, including priority 2n-1 and priority 2n, RI_nIs the number of layers, K, for CSI report n_NZ，nIs the total number of NZ coefficients across layers for CSI report n, and K_{NZ，even，n}Is a cross-layer NZ coefficient for CSI report n in an even FD base vectorThe total number of (c).

From table 3, the associated 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, S is known for all CSI reports₀Related only to the RI reported in part 1 of UCI, and S_nDetermined by the RI and the total number of NZ coefficients across layers specified in UCI part 1 for CSI report n. Therefore, they are determined values known to the first device and the second device side.

However, from equation (3), from the UCI part 1, S_n，0Is unknown because of the total number of NZ coefficients across layers, K, in the even FD basis vectors_{NZ，even，n}It needs to be computed from the per-layer bitmap in the UCI part 2 instead of the UCI part 1 for CSI report n. In this case, embodiments of the present disclosure provide a method of determining the payload size of an even FD basis vector by adapting the allocated PUSCH resources when triggering an ignore rule.

In some example embodiments, the first device 110 may determine the CSI report whose second information is to be partially transmitted according to equations (1) and (2). For example, if

First device 110 may determine N_UIs 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_UIs reported, while the index is greater than N_UAll CSI reports for all priority levels are ignored. For CSI report N_UIts priority level 2N_U-1 (with even FD base vectors) is alsoIs reported and its priority level 2N_U(with odd FDD basis vectors) are ignored.

Upon determining the CSI report whose second information is to be partially transmitted, first device 110 may determine 230 a total number of NZ coefficients across layers in the determined first portion of the CSI report (in this example, priority 2N coefficients)_UEven FD basis vectors in-1), i.e.

In some example embodiments, CSI report N_UPriority 2N of_UThe payload size of-1 can be adjusted and adapted to the allocated PUSCH resource RA, and

may be based on reporting N for CSI_UThe following equation (4).

After determining the total number of NZ coefficients across layers 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 equation (5) below_UThe payload size of the first portion of (a).

In some embodiments, first device 110 may first base on the total number of NZ coefficients

To determine whether the first portion can be sent, and then if soTo send the first part, then 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 total number of NZ coefficients

Lower than the layer teachings involved in the determined CSI report

The first device 110 may determine that the first portion is not necessarily transmitted. In that

In case of (1), i.e. for CSI report N_UThere is only the strongest coefficient per layer, priority (i.e. first part) 2N_UThe 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 first information of CSI reports 1 to N and having a higher determined CSI report N than the determined CSI report N_UHigher priority CSI reports 1 through N_U-1 of second information. At the same time, ignoring the CSI report N for the determination_UAnd a CSI report N having a lower priority than the determined CSI report_U+1 transmission of the second information. It should be noted that the first information (i.e., the basic CSI) on all CSI reports is always transmitted with the highest priority.

In some example implementationsIn the example, if

The first device 110 may transmit the entire partial 2 nd CSI including all priority levels to the second device 120 without triggering the ignore rule. In some example embodiments, if RA < S₀The first device 110 may not transmit the priority level of the part 2 CSI.

In some example embodiments, the first device 110 may transmit a set of CSI reports with partial ignorance to the second device 120 in a data stream. Thus, as shown in fig. 2, in response to receiving the data stream regarding the set of CSI reports, the second device 120 may determine 260 a CSI report from the set of CSI reports for which the second information is partially transmitted. In some embodiments, for example, the second device 120 may determine the CSI report N whose second information is partially transmitted based on the PUSCH resources allocated for CSI reporting and the payload sizes of CSI reports of respective priorities_U. This may be done by a procedure similar to the procedure of the first device 110 determining 220 a CSI report for which the second information is partially transmitted, which is not described in detail herein.

CSI report N of which second information is partially transmitted at the time of determination_UThereafter, the second device 120 may determine 270 the determined CSI report N_UThe total number of NZ coefficients across layers in the first part of (2), i.e.

In some example embodiments, N may be reported for CSI according to equation (4) above_U Computing

Second device 120 may then base the total number of non-zero coefficients determined

To determine 280 the determined CSI report N_UPayload size of the first part of (1)

In some example embodiments, the second device 120 may determine the determined CSI report N according to equation (5) above_UThe 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_UThe first portion of (a). 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 greater ratio than the determined CSI report N_UHigher priority CSI reports 1 through N_U-1 payload size of second information.

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

Fig. 3 illustrates a flow chart of an example method 300 implemented at a first device, such as a terminal device, in accordance with some embodiments of the present disclosure. For purposes of discussion, 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 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 can 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 part and the second part on a frequency domain basis or a spatial domain basis.

In some example embodiments, the second information may contain a bitmap indication in the form of a two-dimensional matrix including 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 basis 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 above examples 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 amplitude excluding a strongest coefficient. It is noted that the division of the first set of parameters and the second set of parameters is not limited to the above examples and may be performed in any suitable way. Furthermore, the first set of parameters and the second set of parameters may also include any other suitable parameters known in the art or developed in the future.

At block 320, the first device 110 may determine a CSI report from the set of CSI reports whose second information is to be partially transmitted. In some example embodiments, the first device 110 may obtain the 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) above₀. The first device 110 may determine a payload size of the second information for each CSI report in the set of CSI reportsIs a plurality of second values (e.g. S)_n). For example, the first device 110 may determine S according to equation (2) above_n. The 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 channel layers in the determined first portion of the CSI report (e.g.,

). In some example embodiments, the first device 110 may obtain the allocated resources (e.g., RA) for the set of CSI reports from the second device 120 and determine the sum of the payload sizes of the 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 of channels involved in the determined CSI report (e.g.,

). The first device 110 may determine the total number of non-zero coefficients across layers 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 a total number of non-zero coefficients across layers for the determined CSI report (e.g.,

). In some example embodiments, the first device 110 may determine according to equation (4) above

At block 340, the first device 110 may determine a payload size of the determined first portion of the CSI report based on the determined total number of non-zero coefficients in the 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 a total number of non-zero coefficients in the first portion and a determined number of layers of a channel involved in the CSI report, and in response to determining that the first portion may be transmitted, the first device 110 may determine a payload size. In some example embodiments, the first device 110 may determine whether a total number of non-zero coefficients in the first portion exceeds a number of layers of channels involved in the determined CSI report, and in response to a total number of non-zero coefficients in the first portion exceeding the number of layers of channels 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 can be improved.

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

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

Fig. 4 illustrates a flow diagram of an example method 400 implemented at a second device, such as a network device, in accordance with some embodiments of the present 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 the scope of the present disclosure is not limited in this respect.

At block 410, the second device 120 may receive a data stream from the first device 110 for a set of CSI reports 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 can 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 part and the second part 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 per-layer bitmap and non-zero linear combination coefficients, each non-zero linear combination coefficient including a phase and amplitude excluding a strongest coefficient. It is noted that the division of the first set of parameters and the second set of parameters is not limited to the above examples and may be performed in any suitable way. Furthermore, the first set of parameters and the second set 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 the set of CSI reports whose second information was 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) above₀. 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. The second device 120 may then determine a CSI report (e.g., CSI report N) based on the size of the resource 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 channel layers 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 a higher priority than the determined CSI report as a third value (e.g.,

). The second device 120 may determine the number of layers of channels involved in the determined CSI report (e.g.,

). The second device 120 may determine the total number of non-zero coefficients across layers in the determined CSI report (e.g.,

). The second device 120 may determine a total number of non-zero coefficients in the first portion based on the size of the resource allocated for the CSI report, 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 (e.g.,

). In some example embodiments, the 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 the determined number of layers of the channel involved in the 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 channels involved in the determined CSI report, and in response to the total number of non-zero coefficients exceeding the number of layers of channels 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, the 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 a second part for the determined CSI report and transmission of second information for a CSI report having a lower priority than the determined CSI report are ignored. In some example embodiments, the second device 120 may also determine the first information from the data stream regarding all CSI reports having the highest priority for transmission.

With the method of fig. 4, the payload size of the priority level may be conveniently determined by the allocated PUSCH resources without additional UCI part 1 design, so that the CSI may 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 way. For example, the components may be implemented in a circuit or a 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, from the set of CSI reports, a CSI report whose second information is to be partially transmitted; means for determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; means for determining a payload size of a 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 a first portion of the determined CSI report to a second device based on the payload size.

In some embodiments, the apparatus also includes means for performing other steps in some embodiments of the method 300. In some embodiments, the component comprises 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 way. For example, the components may be implemented in a circuit or a 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 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 need to be necessarily transmitted and second information regarding a second set of parameters that can be selectively sent, 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 lower than the first priority; means for determining, from the set of CSI reports, a CSI report whose second information is partially transmitted; means for determining a total number of non-zero coefficients across channel layers in the determined first portion of the CSI report; means for determining a payload size of a 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 also includes means for performing other steps in some embodiments of the method 400. In some embodiments, the component comprises 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 a device 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., transmitters and/or receivers) coupled to the processors 510.

The communication module 540 is used for bidirectional 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 time dependent from a clock synchronized to the main 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, a hard disk, a Compact Disk (CD), a Digital Video Disk (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 persist for the duration of the power down.

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

Embodiments of the present disclosure may be implemented by way of program 530 to enable device 500 to 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 a combination of hardware and software.

In some embodiments, program 530 may be tangibly embodied in a computer-readable medium, which may be included in device 500 (such as in memory 520) or in other storage accessible to device 500. Device 500 may load program 530 from the 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, a hard disk, a CD, a 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 the block diagrams, 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, 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 a distributed facility, program modules may be located in both local and remote memory storage media.

Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes 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 codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. 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 the present disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of a carrier include a signal, computer readable medium, and the like.

The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A 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.

Further, while 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, 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 including first information regarding a first set of parameters 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 lower than the first priority;

determining a CSI report from the set of CSI reports that 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 the determined total number of the non-zero coefficients in the first portion; and

transmitting the determined first portion of the CSI report to the second apparatus 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 a higher priority than the determined CSI reports to the second device, and

wherein the following are ignored: a transmission of the second part for the determined CSI report, and a transmission of 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

determining the CSI report 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 the total number of the non-zero coefficients in the first portion of the CSI report that are determined 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 a number of the 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

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

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

determining whether the first portion can be sent based on the total number of non-zero coefficients in the first portion and the determined number of layers of the channel involved in the CSI report; and

in response to determining that the first portion can be sent, determining the payload size 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 sent 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

determining that the first portion can be sent 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.

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

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 a strongest coefficient for each layer.

8. The method of any of claims 1-6, wherein the second information is uniformly 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, comprising:

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 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 required to be necessarily 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 that the second information was partially transmitted;

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

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

11. The method of claim 10, further comprising: determining 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 from the data stream, and

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

determining the CSI report based on the size of the allocated resources 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 the total number of the non-zero coefficients in the first portion of the CSI report that are determined 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;

determining the total number of non-zero coefficients in the first portion 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 reports.

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

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

in response to determining that the first portion is sent, determining the payload size 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 sent 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

determining that the first portion is sent 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.

16. The method of any of claims 10-15, wherein the first set of parameters comprises 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

17. The method of any of claims 10-15, wherein the second information is uniformly 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, comprising:

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 the apparatus to:

20. An apparatus, 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 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 including first information regarding a first set of parameters 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;

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

21. An apparatus, 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 including first information regarding a first set of parameters 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;

means for determining a CSI report from the set of CSI reports that 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 the determined total number of the non-zero coefficients in the first portion; and

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

22. An apparatus, 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 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 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;

means for determining a CSI report from the set of CSI reports that the second information was partially transmitted;

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