CN114208052A

CN114208052A - Transmission of channel state information

Info

Publication number: CN114208052A
Application number: CN201980099055.3A
Authority: CN
Inventors: 刘皓; F·托萨托; M·玛索
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: 2019-07-31
Filing date: 2019-07-31
Publication date: 2022-03-18
Anticipated expiration: 2039-07-31
Also published as: WO2021016933A1; CN114208052B

Abstract

Embodiments of the present disclosure relate to methods, devices, apparatuses, and computer-readable storage media for Channel State Information (CSI) transmission. The first device determines, from the plurality of CSI reports, a subset of CSI reports that precede the target CSI report based on the payload and the resource size in response to determining that the payload of CSI to be transmitted in the slot exceeds the resource size allocated to reporting CSI to the first device for reporting CSI. The target CSI report includes a first part and a second part, and the second part is to be omitted in reporting CSI. The first device determines a payload of a first portion of a target CSI report. The first device then transmits at least a CSI parameter set of the plurality of CSI reports and a subset of CSI reports to the second device, the CSI parameter set indicating at least a payload of the first portion of the target CSI report. With the design of CSI portion 2, where the CSI message has a dynamic payload size, the CSI message can match the resources allocated by the BTS, thereby reducing the overhead of the CSI message.

Description

Transmission of channel state information

Technical Field

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

Background

An important aspect of Channel State Information (CSI) signaling in the downlink is the arrangement of the components of the compressed Precoding Matrix Indicator (PMI) in the CSI message. In a conventional manner, the message may be organized into two parts, "CSI part 1" and "CSI part 2". CSI part 1 may include Channel Quality Indicator (CQI) information and parameters required to determine the payload size of CSI part 2. CSI part 2 may comprise a number of compressed PMIs and is transmitted on the Physical Uplink Shared Channel (PUSCH). The PMI is represented by a matrix for each reporting layer, each containing as many column vectors as the number of Subbands (SB). Spatial Domain (SD) and Frequency Domain (FD) compression operations are applied to these PMI matrices across their rows and columns, respectively.

Traditionally, for example, in the third generation partnership project (3GPP) Rel-15, omission rules for partially reporting CSI on PUSCH are introduced to reduce the overhead of reporting CSI from User Equipment (UE) to Base Transceiver Stations (BTS). According to the omission rule, the CSI reports included in the CSI part 2 are each divided into two separate boxes based on even or odd SB. When the BTS does not allocate resources enough to feed back all CSI-parts 2, CSI reporting may be partially omitted from the box with the lowest priority to the box with the higher priority until the payload for reporting CSI matches the allocated resources. With the evolution of 3GPP New Radio (NR) Rel-16, CSI has been extended to higher ranks with Rank Indicators (RI)3 or 4 to support more data streams per UE for single user multiple input multiple output (SU-MIMO) and multiple user multiple input multiple output (MU-MIMO) in the downlink. In this context, the CSI feedback overhead has a wide dynamic range, depending on the number of transmission layers that may be increased due to rank expansion, and the number of non-zero (NZ) LC coefficients included in the matrix per layer.

Disclosure of Invention

In general, example embodiments of the present disclosure provide solutions for transmitting CSI.

In a first aspect, a first apparatus is provided. The first device 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 first apparatus to: in response to determining that a payload of Channel State Information (CSI) to be transmitted in a slot exceeds a resource size allocated for reporting CSI to a first device, determining, from a plurality of CSI reports, a subset of CSI reports that precede a target CSI report based on the payload and the resource size, the target CSI report including a first portion and a second portion, the second portion being omitted in reporting the CSI; determining a payload of a first portion of a target CSI report; and transmitting, to the second device, a CSI parameter set of at least the plurality of CSI reports and a subset of the CSI reports, the CSI parameter set indicating at least a payload of the first portion of the target CSI report.

In a second aspect, a second apparatus is provided. The second device 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 second apparatus to: determining a subset of a plurality of Channel State Information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports, and a resource size allocated for reporting the CSI; receiving a set of CSI parameters and a subset of CSI reports from a first device; determining, based on a set of CSI parameters and a resource size, whether a target CSI report is received after a subset of the CSI reports, the target CSI report including a first portion and a second portion, the second portion being omitted in the reporting CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and in response to determining to receive the target CSI report, receive a first portion of the target CSI report.

In a third aspect, a method implemented at a first device is provided. The method comprises the following steps: in response to determining that a payload of Channel State Information (CSI) to be transmitted in a slot exceeds a resource size allocated for reporting CSI to a first device, determining, from a plurality of CSI reports, a subset of CSI reports that precede a target CSI report based on the payload and the resource size, the target CSI report including a first portion and a second portion, the second portion being omitted in reporting the CSI; determining a payload of a first portion of a target CSI report; and transmitting, to the second device, a CSI parameter set of at least the plurality of CSI reports and a subset of the CSI reports, the CSI parameter set indicating at least a payload of the first portion of the target CSI report.

In a fourth aspect, a method implemented at a second device is provided. The method comprises the following steps: determining a subset of a plurality of Channel State Information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports, and a resource size allocated for reporting the CSI; receiving a set of CSI parameters and a subset of CSI reports from a first device; determining, based on a set of CSI parameters and a resource size, whether a target CSI report is received after a subset of the CSI reports, the target CSI report including a first portion and a second portion, the second portion being omitted in the reporting CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and

in response to determining to receive the target CSI report, a first portion of the target CSI report is received.

In a fifth aspect, there is provided an apparatus comprising: means for determining, from a plurality of Channel State Information (CSI) reports, a subset of CSI reports that precede a target CSI report based on payload and resource size in response to determining that a payload of CSI to be transmitted in a slot exceeds a resource size allocated for reporting CSI to a first device, the target CSI report including a first portion and a second portion, the second portion omitted in reporting the CSI; means for determining a payload of a first portion of a target CSI report; and means for transmitting at least a CSI parameter set of the plurality of CSI reports and a subset of the CSI reports to the second device, the CSI parameter set indicating at least a payload of the first portion of the target CSI report.

In a sixth aspect, there is provided an apparatus comprising: means for determining a subset of a plurality of Channel State Information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports, and a resource size allocated for reporting CSI; means for receiving a set of CSI parameters and a subset of CSI reports from a first device; means for determining whether a target CSI report is received after a subset of CSI reports based on a set of CSI parameters and a resource size, the target CSI report including a first portion and a second portion, the second portion being omitted in reporting CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and means for receiving a first portion of the target CSI report in response to determining to receive the target CSI report.

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 third or fourth aspect described above.

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 signaling flow diagram for CSI transmission in accordance with some example embodiments of the present disclosure;

fig. 3 illustrates a flow diagram of a method implemented at a first device in accordance with some embodiments of the present disclosure;

fig. 4 illustrates a flow diagram of a method implemented at a second device in accordance with some other embodiments of the present disclosure;

FIG. 5 shows a simplified block diagram of an apparatus suitable for implementing embodiments of the present disclosure; and

fig. 6 illustrates a block diagram of an example computer-readable medium, in accordance with some embodiments 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 examples are described for illustrative purposes only and to aid those skilled in the art in understanding and practicing the present disclosure, and are not intended to suggest any limitation as to the scope of the present disclosure. The present disclosure described herein may be implemented in various ways other than those described below.

In the following specification 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.

In the present disclosure, references 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 may be termed a second element, and, similarly, a second element may 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," "includes" 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 in analog-only and/or digital circuits) and

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

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

(ii) any portion of hardware processor(s) with software (including digital signal processor(s), 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) that require software (e.g., firmware) for operation, such as microprocessor(s) or a portion of microprocessor(s), but software may not be present when software is not required for operation.

This definition of circuitry applies to all uses of this term in this application, including in any claims. As another example, the term circuitry, as used in this application, also encompasses implementations of merely 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. The term circuitry also encompasses, for example and if applicable to the particular claim element, 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 so forth. Further, communication between the terminal device and the network devices in the communication network may be performed 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 growth in the field of communications, there will of course be future types of communication technologies and systems that may be used to implement the present disclosure. It should not be considered as limiting the scope of the disclosure to only the foregoing systems.

As used herein, the term "first device" refers to any terminal device capable of wireless communication. In some embodiments, the first device may be a terminal device. 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 end 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 end devices, Personal Digital Assistants (PDAs), portable computers, desktop computers, image capture end devices such as digital cameras, gaming end devices, music storage and playback devices, in-vehicle wireless end devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop installation 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 on 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.

The term "second device" refers to a node in the communication network via which the terminal device accesses the network and receives services therefrom. In some embodiments, the second device may be a network device. A network device may refer to a Base Station (BS) or an Access Point (AP), e.g., a NodeB (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NR NB (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.

In a communication network in which multiple network devices are jointly deployed in a geographic area to serve respective cells, a terminal device may have an active connection with the network device when located within the respective cell. In an active connection, a terminal device may communicate with the network device on a frequency band in both the Uplink (UL) and Downlink (DL). A terminal device may need to handover a link in one direction, such as the UL, to another network device for various reasons, such as quality degradation in the UL.

In Rel-16, CSI has been compressed by a Discrete Fourier Transform (DFT) -based operation to exploit the correlation in FD and reduce the number of significant coefficients needed to describe PMI. After DFT-based FD compression, the LC coefficients to be reported are sparse in the transform domain, and their energy is mainly concentrated and limited to a few FD basis vectors. Furthermore, as described above, CSI has a dynamic payload size, as shown in table 1.

Payload statistics for CSI part 2 in Table 1-Rel-16

Wherein N is₁Is the number of antenna ports used for polarization in the horizontal dimension, N₂Is the number of antenna ports, O, used for polarization in the vertical dimension₁Is an oversampling factor in the horizontal dimension, O₂Is a plumbOversampling factor in the straight dimension, L being the number of SD basis components in polarization, N₃Is the number of PMI subbands configured, K_NZIs the total number of NZ coefficients across the layers, p and beta are the ratio, M_iIs the number of FD basis components in layer i, and RI is the number of layers. Assume RI 1 and K_NZThe minimum total payload is then calculated as follows, 1

S_min84 bits for 66 × 1+7 × 1+11

And the maximum total payload for CSI reporting is calculated as follows, assuming RI is 4 and K_NZ＝2K₀Wherein

S_max＝66×4+7×2K₀+11＝14K₀+275 bits

When in use

Then S_max14 × 14+275 is 471 bits.

When in use

Then S_max14 × 28+275 is 667 bits.

When in use

Then S_max14 × 42+275 ═ 863 bits.

According to the above S_minAnd S_maxThe dynamic payload size of CSI part 2 in Rel-16 ranges from 84 bits to 863 bits. From the BTS perspective, it is difficult to predict the correct amount of resources to allocate for reporting CSI.

Embodiments of the present disclosure provide a solution for reporting CSI in part on PUSCH based on resources allocated on PUSCH. When reporting CSI, the first device selects a subset of CSI reports to be fully transmitted based on the payload of the CSI reports and the allocated resources. The first device determines whether the remaining resources are sufficient to send a portion of the target CSI report after the CSI report subset. The first device then transmits the partial or complete omission of the target CSI report based on the determination. In this way, the overhead of CSI feedback with dynamic payload size may be reduced. The present disclosure also proposes a CSI message with the dynamic payload size of CSI part 2 so that the CSI message can match the resources allocated by the BTS. Furthermore, a mechanism is provided to indicate the payload size of the first part of the partially or fully omitted target CSI report. 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 comprises a first device 110 and a second device 120. For example, the network 100 may provide one or more cells to serve the second device 120. 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 on the present disclosure. Communication network 100 may include any suitable number of network devices, terminal devices, and/or cells suitable for implementing implementations of the present disclosure.

In the communication network 100, the first device 110 may transmit data and CSI to the second device 120, and the second device 120 may allocate resources for the first device 110 and receive CSI from 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), LTE-evolution, 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 in accordance with any generation of communication protocols now known or later developed. 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.

The CSI may ensure reliability of wireless communication between the first device 110 and the second device 120. The process of reporting CSI is also referred to as "CSI feedback". To obtain CSI for a communication channel between the first device 110 and the second device 120, the second device 120 may allocate resources for the first device 110. The first device 110 may then report CSI to the second device 120 on PUSCH.

The CSI part 2 may be divided into basic-domain CSI parameters and transform-domain CSI parameters. The basic-domain CSI parameters include at least an indicator for SD base subset selection (including an oversampling factor), an indicator for FD base subset selection, and a Strongest Coefficient Indicator (SCI). The transform-domain CSI parameters comprise a bitmap corresponding to and indicating the positions of the non-zero LC coefficients in the matrix of each layer, the amplitude of the non-zero LC coefficients including a reference amplitude of weaker polarization of each layer, and the phase of the non-zero LC coefficients of each layer. In some example embodiments, the transform-domain CSI parameters are included in a plurality of CSI reports, and the base-domain CSI parameters are related to the plurality of CSI reports and included in a CSI parameter set of the plurality of CSI reports.

In some example embodiments, the first device 110 may determine the matrix based on downlink channel measurements and compression operations. This matrix, also referred to as the LC coefficient matrix, is used to characterize the channel between the first device 110 and the second device 120. The matrix is compressed in both SD and FD, and thus includes spatial components in the spatial domain and frequency components in the frequency domain. The matrix includes a substantially reduced number of sets of Linear Combination (LC) coefficients by a compression operation than ever before, and has a plurality of spatial and frequency components as two dimensions. As described above, a bitmap corresponding to the LC coefficient matrix is used to indicate the locations of the non-zero LC coefficient sets used to quantize the channel. This aspect will be discussed in detail below.

Fig. 2 illustrates a signaling flow diagram for CSI transmission, according to some example embodiments of the present disclosure. For discussion purposes, the process 200 will be described with reference to fig. 1. Process 200 may involve first device 110 and second device 120 as shown in fig. 1.

As shown in fig. 2, the first device 110 may receive 210 downlink control information from the second device 120 and obtain a resource indication indicating a size of resources allocated by the second device 120 for reporting CSI. In other words, the size of the resources allocated for reporting CSI is known to both the first device 110 and the second device 120.

The first device 110 may compare the payload of the CSI to be transmitted in the slot with the resource size. Based on the determination that the payload of the CSI to be transmitted in the slot exceeds the resource size, the first device 110 determines 215, from the plurality of CSI reports, a subset of CSI reports that precede the target CSI report based on the payload and the resource size. In some example embodiments, the target CSI report may be divided into a first part and a second part, and at least the second part of the target CSI will be omitted in the reporting CSI.

The second device 120 may obtain the payloads of the multiple CSI reports by receiving part 1 of the CSI message. The second device 120 determines 225 a subset of the plurality of CSI reports based on the payload and the resource size of the plurality of CSI reports.

The first device 110 determines 220 a payload of a first portion of the target CSI report and sends 230 at least a CSI parameter set and a subset of CSI reports of the plurality of CSI reports to the second device 120, wherein the CSI parameter set indicates at least the payload of the first portion of the target CSI report.

The second device 120 then receives 235 a subset of the CSI reports comprised in CSI part 2. The second device 120 determines 240 whether the target CSI report is received after the subset of CSI reports based on the CSI parameter set and the resource size. Based on the determination to receive the target CSI report, the second device 120 receives 245 a first portion of the target CSI report.

Referring now to fig. 3, shown is a flow diagram of a method implemented at the first device 110, in accordance with some embodiments of the present disclosure. The method 300 may be implemented at the first device 110 as shown in fig. 1. For discussion purposes, the method 300 will be described with reference to fig. 1.

The second device 120 may indicate in the resource indication the resources allocated for reporting CSI to the first device 110. At 310, the first device 110 may determine whether the payload of CSI to be transmitted in the slot exceeds the resource size allocated by the second device 120.

Assume that the first device 110 intends to report multiple CSI reports N included in CSI part 2 in a slot_RepAnd N is_RepEach of the CSI reports has a respective priority. As described above, the CSI portion 1 includes parameters required to determine the payload size of the CSI portion 2, e.g., a respective payload size of each of the plurality of CSI reports. At 320, based on determining that the payload of CSI to be transmitted in the slot exceeds the resource size allocated for reporting CSI, the first device 110 determines a subset of CSI reports from the plurality of CSI reports that precede the target CSI report based on the payload and resource size.

In some example embodiments, first device 110 may obtain N with corresponding priorities_RepAnd determining the subset of CSI reports in descending order of priority such that a payload of the subset of CSI reports matches the allocated resource size.

In some examples of embodiments, the first device 110 may divide each CSI report of the plurality of CSI reports into a first part and a second part, and assign a respective priority for the CSI omission rule for each part and the CSI parameter set, as shown in table 2 below.

Table 2-priority of reporting CSI for CSI omission rule

Priority 0-including CSI reports 1 through N_RepOf the basic domain CSI parameters
	Priority 1-first part of CSI report 1 including transform-domain CSI parameters
Priority 2-CS including transform-domain CSI parametersSecond part of Ireport 1
	Priority 3-first part of CSI report 2 including transform-domain CSI parameters
Priority 4-second part of CSI report 2 including transform-domain CSI parameters
	…
Priority 2N_Rep-1-CSI report N comprising transform domain CSI parameters_RepFirst part of
	Priority 2N_Rep-a CSI report N comprising transform domain CSI parameters_RepSecond part of (2)

Wherein the CSI parameter set has the highest priority (i.e., priority 0) including CSI reports 1 to N in one slot_RepAnd the payload size of the CSI parameter set is determined by the RI indicated in CSI part 1. For transform-domain CSI parameters of multiple CSI reports, each CSI report may be further divided into a first part and a second part having respective priorities, i.e., from priority 1 to 2N_Rep。

In some example embodiments, each CSI report is further divided into a first part and a second part by determining the polarization of the matrix in the corresponding CSI report in the SD. In other words, N is determined based on polarization_RepA first portion and a second portion of a CSI report. As described above, the matrix comprises a set of LC coefficients used to quantize the channel between the first device 110 and the second device 120, and has spatial and frequency components, with the polarization having half of the spatial component in the SD. For example, the polarization of the matrix in the CSI report may be determined by the Strongest Coefficient Indicator (SCI). In particular, in CSI reporting, there is one SCI for each reported layer, because of the LC coefficientsThe normalization of (a) is done independently for each layer. The first device 110 may determine the SCI based on the spatial component in which the strongest coefficient is located. Then, half of the matrix in the SD containing the SCI is determined to have a first polarization, and the other half of the matrix is determined to have a second polarization.

In some example embodiments, each CSI report is further divided into a first part and a second part by an index of a frequency component of a matrix of the respective CSI. As an example, for CSI reporting, the even indices of the frequency components of the matrix may be determined as a first part of the CSI report, while the odd indices of the frequency components of the matrix may be determined as a second part of the CSI report.

As another example, a portion of the frequency components of the matrix in the CSI report may be determined as a first portion of the CSI report, while another portion of the frequency components of the matrix may be determined as a second portion of the CSI report. For example, a portion of the frequency components of the matrix may contain a preamble to the frequency components

One index, while another portion may contain the remaining indices of the frequency components. Alternatively, a portion of the frequency components of the matrix may contain the first and last of the frequency components

One index, while another portion may contain the remaining indices of the frequency components.

It should be understood that the above approach for partitioning a single CSI report is described for illustrative purposes only, and does not suggest any limitation as to the scope of the disclosure, and that various partitioning approaches other than the described approach are possible.

As shown at 310, determining whether the payload of CSI to be transmitted in a slot exceeds the resource size allocated on the PUSCH may proceed as follows:

the first device 110 determines that the allocated resources are sufficient to feed back the entire CSI part 2, i.e. all N will be reported without triggering the CSI omission rule_RepAnd each CSI report comprises:

wherein RA is a resource size allocated on PUSCH for reporting CSI, and S₀Is included for all N_RepA payload size of a CSI parameter set of the basic domain CSI parameters of the CSI reports;

the first device 110 may determine that the allocated resources are not sufficient to feed back the entire CSI-part 2, and therefore will send multiple CSI reports in part, where the CSI omission rule is triggered:

wherein N is_UIndicating a target CSI report, S, which may be omitted partially or completely_nIs the payload size of CSI report n. In this case, the target CSI report N_UComprises a first part and a second part, and omits at least the second part of the target CSI report and CSI reports having a lower priority than the target CSI report.

First device 110 may determine that N will not be reported in the following cases_RepAny one of the CSI reports:

RA＜S₀ (3)

it should be noted that the payload size S is for all of the multiple CSI reports₀Only with the RI reported in CSI part 1_nCorrelated, and calculated as:

payload size S_nCross-layer non-zero LC coefficient K specified for CSI report n in CSI part 1_NZ,nAnd RI_nIs determined and can be calculated as:

S_n＝7K_NZ，n+53RI_n (5)

triggering a CSI omission rule when it is determined that at least a second portion of the target CSI report is to be omitted. At 330, the first device 110 determines a payload of a first portion of the target CSI report. In some example embodiments, the first device 110 may then compare the payload of the first portion of the target CSI to the difference between the resource size and the payload of the subset of CSI reports.

At 340, the first device 110 sends at least a CSI parameter set and a subset of CSI reports of the plurality of CSI reports to the second device 120. The CSI parameter set indicates at least a payload of a first portion of the target CSI report. In some example embodiments, the first device 110 may send the first portion of the target CSI report after the subset of CSI reports if the payload of the first portion of the target CSI report is less than or equal to the difference. For example, the first device 110 may determine to transmit the target CSI report partially, i.e., transmit a first portion of the target CSI report, and omit a second portion of the target CSI report, as follows:

wherein

Is a target CSI report N_U(N_U＝1,…,N_Rep) And may be calculated as:

wherein

Is a cross-layer CSI report N_UOf the first part of the second part. In case of equation (6), the CSI report having a priority higher than the target CSI report and the CSI message having a priority of 0 form a subset of the CSI report, and a sub-subset of the CSI reportSet and target CSI report N_UAre sent together, and N_RepThe rest of the CSI reports are omitted by the first device 110.

In some example embodiments, for example, if the payload of the first portion of the target CSI report is greater than the difference, then the determination may be made as follows:

the first device 110 may omit the target CSI report N_UThe first portion of (a). In this case, the entire target CSI report N is omitted_UAnd only a subset of the CSI reports are sent from the first device 110 to the second device 120.

At 340, the first device 110 transmits at least a subset of the CSI reports to the second device 120. In some example embodiments, the first device 110 may utilize a CSI parameter set to indicate at least a payload of a first portion of a target CSI report. Thus, by transmitting the CSI parameter set, the first device 110 may inform the second device 120 of the payload of the first part of the target CSI report so that the second device 120 may determine that the target CSI report is partially or entirely omitted, which will be described in detail below.

In some example embodiments, the first device 110 may indicate the target CSI report N by including in the CSI parameter set_UIs used to indicate at least the payload of the first part of the target CSI report with the CSI parameter set. For example, the first device 110 may define a new indicator

Indicating a target CSI report N in a CSI parameter set_UThe number of non-zero LC coefficients in the first part of (a), and

should be no greater than

For special cases, CSI report N_UHas at least the strongest coefficient in each layer, if so

Then priority 2N should also be omitted_U-1 first part of a target CSI report. Thus, value

In that

In range and have corresponding quantization bits for its feedback, such as

A bit.

In some example embodiments, the first device 110 may report N from the target CSI by using a bitmap_UMoving to a CSI parameter set to indicate at least a payload of a first portion of a target CSI report with the CSI parameter set. In this case, the bitmap indicates the location and number of non-zero LC coefficients in the first part of the target CSI report.

Alternatively or additionally, the first device 110 may select the bitmap from N by changing the bitmap from N_RepA first part of the CSI reports is moved to the CSI parameter set to indicate at least a target CSI report N with the CSI parameter set_UThe payload of the first portion of (a). In this case, the bitmap indicates respective positions and numbers of non-zero linear combining coefficients in the first portion of the plurality of CSI reports.

Alternatively or additionally, the first device 110 may utilize a non-zero coefficient K for each CSI report included in the CSI part 1_NZ,nIndicates information related to CSI omission. For example, an indicator of non-zero coefficients may be determined by retaining K_NZ,nSome unimportant values of (e.g.: 1, …, RI) to contain some information of which CSI is omitted. For example, if K_NZ,nIf 1, the CSI report should be partially omitted.

Fig. 4 illustrates a flow diagram of a method 400 implemented at a second device, in accordance with some other embodiments of the present disclosure. The method 400 may be implemented by the second device 120 as shown in fig. 1. For discussion purposes, the process 400 will be described with reference to fig. 1.

At 410, the second device 120 determines a subset of the plurality of CSI reports based on the payloads of the plurality of CSI reports, the CSI parameter sets of the plurality of CSI reports, and the size of resources allocated on the PUSCH for reporting CSI.

In some example embodiments, the second device may obtain the payload size of each of the plurality of CSI reports from the CSI portion 1 transmitted from the first device 110. Thus, the second device may determine the subset of CSI reports to be fully received based on the respective priorities and payloads of the CSI reports and the resource size.

At 420, the second device 120 receives the subset of CSI reports and the set of CSI parameters from the first device 110. As described above, the CSI parameter set with the highest priority indicates the target CSI report N following the CSI report subset_UThe payload of the first portion of (a).

At 430, the second device 120 determines whether the target CSI report N is received after the subset of CSI reports_U. Target CSI report N_UIs divided into a first part and a second part, and the second part will be omitted in reporting CSI.

In some example embodiments, the second device 120 may determine the target CSI report N by determining the target CSI report N_UIs less than or equal to a difference between the resource size and a payload of the CSI report subset to determine whether there is a CSI report N_UAfter receiving the target CSI report. If the target CSI reports N_UIs less than or equal to the difference, the second device 120 may determine to receive the target CSI report N_U. Otherwise, the second device 120 may determine to omit the target CSI report N_U。

Upon determining to receive a target CSI report N_UThereafter, at 440, the second device 120 receives a first portion of the target CSI report. In some casesIn an example embodiment, the second device 120 may determine the target CSI report N according to an indication included in the CSI parameter set_UThe payload of the first portion of (a). The indication is defined in a CSI parameter set for indicating a target CSI report N_UThe number of non-zero LC coefficients in the first portion of (a). Thus, with target CSI report N_UThe second device 120 may obtain the target CSI report N by the number of non-zero LC coefficients in the first part of_UThe payload of the first portion of (a).

In some example embodiments, the second device 120 may determine the target CSI report N from a bitmap included in the CSI parameter set_UThe payload of the first portion of (a). As discussed with reference to fig. 3, the bitmap reports N from the target CSI_UMove to CSI parameter set and indicate target CSI report N_UThe location and number of non-zero LC coefficients in the first portion of (a). Thus, with target CSI report N_UThe second device 120 may obtain the target CSI report N by the number of non-zero LC coefficients in the first part of_UThe payload of the first portion of (a).

In some example embodiments, the second device 120 may determine the target CSI report N from a bitmap included in the CSI parameter set_UThe payload of the first portion of (a). As discussed with reference to fig. 3, the bitmap is moved from the first portion of the plurality of CSI reports to the CSI parameter set and indicates respective positions and numbers of non-zero linear combining coefficients in the first portion of the plurality of CSI reports. Thus, with target CSI report N_UThe second device 120 may obtain the target CSI report N by the number of non-zero LC coefficients in the first part of_UThe payload of the first portion of (a).

In some embodiments, an apparatus (e.g., first device 110) capable of performing any of method 300 may include means for performing the various steps of method 300. These components may be implemented in any suitable form. For example, these components may be implemented in circuits or software modules.

In some embodiments, the apparatus comprises: means for determining, based on the payload and the resource size, a subset of CSI reports from the plurality of CSI reports that precede a target CSI report in response to determining that the payload of the CSI to be transmitted in the slot exceeds the resource size allocated for reporting the CSI to the first device, the target CSI report including a first portion and a second portion, the second portion being omitted in reporting the CSI; means for determining a payload of a first portion of a target CSI report; and means for transmitting at least a CSI parameter set of the plurality of CSI reports and a subset of the CSI reports to the second device, the CSI parameter set indicating at least a payload of the first portion of the target CSI report.

In some embodiments, the apparatus also includes means for performing other steps in some embodiments of the method 300. In some embodiments, the components include 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, the apparatus further comprises means for obtaining a plurality of CSI reports having respective priorities; and means for determining a CSI report subset from the plurality of CSI reports in descending order of priority such that a payload of the CSI report subset matches the resource size.

In some embodiments, the apparatus further includes means for transmitting the first portion of the target CSI report after the CSI report subset in response to the payload of the first portion of the target CSI report being less than or equal to the difference between the resource size and the payload of the CSI report subset.

In some embodiments, the apparatus further comprises means for including, in the CSI parameter set, an indication indicative of a number of non-zero linear combining coefficients in the first portion of the target CSI report.

In some embodiments, the apparatus further comprises means for moving a bitmap from the target CSI report to the CSI parameter set, the bitmap indicating positions and numbers of non-zero linear combining coefficients in the first portion of the target CSI report.

In some embodiments, the apparatus further comprises means for dividing each CSI report of the plurality of CSI reports into a first portion and a second portion; and means for moving a bitmap from the first portion of the plurality of CSI reports to the set of CSI parameters, the bitmap indicating respective positions and numbers of non-zero linear combination coefficients in the first portion of the plurality of CSI reports.

In some embodiments, the apparatus further comprises means for determining a polarization of a matrix in the CSI report in the spatial domain, the matrix comprising a set of linear combination coefficients for quantizing a channel between the first device and the second device, the matrix having a spatial component and a frequency component, and the polarization having half the spatial component; and means for determining a first portion and a second portion of the CSI report based on the polarization.

In some embodiments, the apparatus further comprises means for determining an even index of a frequency component of a matrix in the CSI report as the first portion, the matrix comprising a set of non-zero linear combining coefficients for quantizing a channel between the first device and the second device, the matrix having a spatial component and a frequency component; and means for determining odd indices of frequency components of the matrix in the CSI report as the second part.

In some embodiments, the apparatus further comprises means for determining a portion of frequency components of a matrix in the CSI report as a first portion, the matrix comprising a set of non-zero linear combining coefficients for quantizing a channel between the first device and the second device, the matrix having spatial components and frequency components, the portion of frequency components comprising a first frequency component of the matrix; and means for determining the other half frequency component of the matrix as the second portion.

In some embodiments, an apparatus (e.g., second device 120) capable of performing any of method 400 may include means for performing the various steps of method 400. These components may be implemented in any suitable form. For example, these components may be implemented in circuits or software modules.

In some embodiments, the apparatus comprises: means for determining a subset of a plurality of Channel State Information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports, and a resource size allocated for reporting CSI; means for receiving a set of CSI parameters and a subset of CSI reports from a first device; means for determining whether a target CSI report is received after a subset of CSI reports based on a set of CSI parameters and a resource size, the target CSI report including a first portion and a second portion, the second portion being omitted in reporting CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and means for receiving a first portion of the target CSI report in response to determining to receive the target CSI report.

In some embodiments, the apparatus also includes means for performing other steps in some embodiments of the method 400. In some embodiments, the components include 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, the apparatus further comprises means for determining whether a payload of the first portion of the target CSI report is less than or equal to a difference between the resource size and a payload of the CSI report subset; and means for determining to receive the target CSI report in response to determining that the payload of the first portion of the target CSI report is less than or equal to the difference.

In some embodiments, the apparatus further includes means for determining a payload of the first portion of the target CSI report from an indication included in the CSI parameter set, the indication indicating a number of non-zero linear combining coefficients in the first portion of the target CSI report.

In some embodiments, the apparatus further comprises means for determining a payload of the first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap moved from the target CSI report to the CSI parameter set and indicating a location and a number of non-zero linear combining coefficients in the first portion of the target CSI report.

In some embodiments, the apparatus further comprises means for determining a payload of a first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap moving from the first portion of the plurality of CSI reports to the CSI parameter set and indicating respective positions and numbers of non-zero linear combining coefficients in the first portion of the plurality of CSI reports.

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, as 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 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.

The processor may be of any type suitable for a local technology network, and may include one or more of the following: by way of non-limiting example, 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 Disc (CD), a Digital Video Disc (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 loss.

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 the program 530 such that the device 500 may perform any of the processes of the present disclosure discussed with reference to fig. 3 and 4. Embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

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 storage device, such as a ROM, EPROM, flash memory, hard disk, CD, DVD, or the like. 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 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, executed in a device on a target real or virtual processor to perform the

methods

300 or 400 described above with reference to fig. 3-4. 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 of program modules may be executed within local or distributed devices. In a distributed facility, program modules may be located in both local and remote memory storage media.

Program code for performing the 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 a computer-readable storage medium would include 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 described 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 cases, multitasking and parallel processing may be advantageous. Also, while several specific implementation details are included in the above discussion, 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 first device, 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 first apparatus to:

in response to determining that a payload of channel state information, CSI, to be transmitted in a slot exceeds a resource size allocated to the first device for reporting the CSI, determining, from a plurality of CSI reports, a subset of CSI reports that precede a target CSI report based on the payload and the resource size, the target CSI report including a first portion and a second portion, the second portion to be omitted in reporting the CSI;

determining a payload of the first portion of the target CSI report; and

transmitting at least a set of CSI parameters of the plurality of CSI reports and the subset of the CSI reports to a second device, the set of CSI parameters indicating at least the payload of the first portion of the target CSI report.

2. The first device of claim 1, wherein the first device is caused to determine the subset of the CSI reports by:

obtaining the plurality of CSI reports with respective priorities; and

determining the subset of CSI reports from the plurality of CSI reports in descending order of the priority such that a payload of the subset of CSI reports matches the resource size.

3. The first device of claim 2, wherein the first device is further caused to:

transmitting the first portion of the target CSI report after the subset of the CSI reports in response to the payload of the first portion of the target CSI report being less than or equal to a difference between the resource size and the payload of the subset of the CSI reports.

4. The first device of claim 1, wherein the first device is further caused to include an indication in the CSI parameter set, the indication indicating a number of non-zero linear combining coefficients in the first portion of the target CSI report.

5. The first device of claim 1, wherein the first device is further caused to:

moving a bitmap from the target CSI report to the CSI parameters set, the bitmap indicating positions and numbers of non-zero linear combination coefficients in the first portion of the target CSI report.

6. The first device of claim 1, wherein the first device is further caused to:

dividing each of the plurality of CSI reports into a first portion and a second portion; and

moving a bitmap from the first portion of the plurality of CSI reports to the CSI parameters set, the bitmap indicating respective positions and numbers of non-zero linear combination coefficients in the first portion of the plurality of CSI reports.

7. The first device of claim 6, wherein the first device is caused to partition each CSI report by:

determining a polarization of a matrix in a CSI report in a spatial domain, the matrix comprising a set of linear combination coefficients for quantizing a channel between the first device and the second device, the matrix having a spatial component and a frequency component, and the polarization having half the spatial component; and

determining the first portion and the second portion of the CSI report based on the polarization.

8. The first device of claim 6, wherein the first device is caused to partition each CSI report by:

determining even-indexed frequency components of a matrix in a CSI report as the first portion, the matrix comprising a set of linear combination coefficients used to quantize a channel between the first device and the second device, the matrix having spatial and frequency components; and

determining odd-indexed frequency components of a matrix in the CSI report as the second portion.

9. The first device of claim 6, wherein the first device is caused to partition each CSI report by:

determining a portion of frequency components of a matrix in a CSI report as the first portion, the matrix comprising a set of linear combination coefficients used to quantize a channel between the first device and the second device, the matrix having spatial components and frequency components, the portion of frequency components comprising first frequency components of the matrix; and

determining another portion of the frequency components of the matrix as the second portion.

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

11. A method implemented at a first device, comprising:

determining a payload of the first portion of the target CSI report; and

12. The method of claim 11, wherein determining the subset of the CSI reports comprises:

obtaining the plurality of CSI reports with respective priorities; and

13. The method of claim 12, further comprising:

14. The method of claim 11, further comprising: including an indication in the CSI parameter set, the indication indicating a number of non-zero linear combining coefficients in the first portion of the target CSI report.

15. The method of claim 11, further comprising:

16. The method of claim 11, further comprising:

17. The method of claim 16, wherein the first device is further caused to partition each CSI report by:

18. The method of claim 16, wherein partitioning each CSI report comprises:

19. The method of claim 16, wherein partitioning each CSI report comprises:

20. The method of any of claims 11-19, wherein the first device is a terminal device and the second device is a network device.

21. A second device, 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 second apparatus to:

determining a subset of a plurality of channel state information, CSI, reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports, and a resource size allocated for reporting CSI;

receiving the set of CSI parameters and the subset of CSI reports from a first device;

determining whether to receive a target CSI report after the subset of CSI reports based on the set of CSI parameters and the resource size, the target CSI report including a first portion and a second portion, the second portion to be omitted in reporting the CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and

receiving the first portion of the target CSI report in response to determining that the target CSI report is to be received.

22. The second device of claim 21, wherein the second device is caused to determine whether to receive the target CSI report by:

determining whether the payload of the first portion of the target CSI report is less than or equal to a difference between the resource size and a payload of the subset of the CSI reports; and

determining that the target CSI report is to be received in response to determining that the payload of the first portion of the target CSI report is less than or equal to the difference.

23. The second device of claim 22, wherein the second device is further caused to:

determining the payload of the first portion of the target CSI report from an indication included in the CSI parameter set, the indication indicating a number of non-zero linear combining coefficients in the first portion of the target CSI report.

24. The second device of claim 22, wherein the second device is further caused to:

determining the payload of the first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap moved from the target CSI report to the CSI parameter set and indicating a location and a number of non-zero linear combining coefficients in the first portion of the target CSI report.

25. The second device of claim 22, wherein each CSI report in the subset comprises a first portion and a second portion, and the second device is further caused to:

determining the payload of the first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap moved from the first portion of the plurality of CSI reports to the CSI parameter set and indicating respective positions and numbers of non-zero linear combining coefficients in the first portion of the plurality of CSI reports.

26. The second device of any of claims 21-25, wherein the first device is a terminal device and the second device is a network device.

27. A method implemented at a second device, comprising:

28. The method of claim 27, wherein determining whether to receive the target CSI report comprises:

29. The method of claim 27, further comprising:

30. The method of claim 27, further comprising:

determining a payload of the first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap being moved from the target CSI report to the CSI parameter set and indicating a location and a number of non-zero linear combining coefficients in the first portion of the target CSI report.

31. The method of claim 27, wherein each CSI report in the subset comprises a first portion and a second portion, and further comprising:

32. The method of any of claims 27-31, wherein the first device is a terminal device and the second device is a network device.

33. An apparatus, comprising:

means for determining, from a plurality of Channel State Information (CSI) reports, a subset of CSI reports prior to a target CSI report based on a payload of CSI information to be transmitted in a slot exceeding a resource size allocated for reporting CSI to a first device, the target CSI report including a first portion and a second portion, the second portion to be omitted in reporting the CSI;

means for determining a payload of the first portion of the target CSI report; and

means for transmitting at least a set of CSI parameters of the plurality of CSI reports and a subset of the CSI reports to a second device, the set of CSI parameters indicating at least the payload of the first portion of the target CSI report.

34. An apparatus, comprising:

means for determining a subset of a plurality of Channel State Information (CSI) reports based on payloads of the CSI reports, CSI parameter sets of the CSI reports, and resource sizes allocated for reporting CSI;

means for receiving the set of CSI parameters and the subset of CSI reports from a first device;

means for determining whether a target CSI report is received after a subset of the CSI reports based on the set of CSI parameters and the resource size, the target CSI report including a first portion and a second portion, the second portion to be omitted in reporting the CSI, the set of CSI parameters indicating at least a payload of the first portion of the target CSI report; and

means for receiving the first portion of the target CSI report in response to determining to receive the target CSI report.

35. A computer readable storage medium comprising program instructions stored thereon, which when executed by a processor of a device, cause the device to perform the method of any of claims 11-20.

36. A computer readable storage medium comprising program instructions stored thereon, which when executed by a processor of a device, cause the device to perform the method of any of claims 27-32.