Method, user equipment and base station for channel state information

Abstract

A method of channel state information (CSI) performed in a user equipment (UE) includes determining which M subbands of all subbands are selected according to a CQI reporting mode, wherein each subband includes at least one physical resource block (PRB); determining a value of M; reporting at least one CQI value based on the M subbands to a base station (BS); and reporting locations of the M subbands to the BS.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication systems, and more specifically, to a method of channel state information (CSI), a user equipment and a base station. BACKGROUND

[0002] Wireless communication systems and networks have evolved towards broadband and mobile systems. In a cellular wireless communication system, user equipments (UEs) are connected to a radio access network (RAN) over a wireless link. The RAN comprises a set of base stations (BSs) that provide wireless links to UEs located in cells covered by the base stations, and an interface to a core network (CN) that provides overall network control. It will be appreciated that the RAN and CN each perform their respective functions in relation to the overall network. The Third Generation Partnership Project (3GPP) has developed a so-called Long Term Evolution (LTE) system, i.e. an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network (E-UTRAN), for mobile access networks in which one or more macro cells are supported by base stations referred to as eNodeBs or eNBs (Evolved Node Bs). More recently, LTE is further evolving towards a so-called 5G or NR (New Radio) system in which one or more cells are supported by base stations referred to as gNBs.

[0003] Ultra-reliable low-latency communication (URLLC) is one of several different types of use cases supported by the 5G NR standard specified by 3GPP Release 15. URLLC is a type of communication service used to successfully deliver data packets with stringent requirements, particularly in terms of availability, latency, and reliability. URLLC was developed to support emerging applications and services such as wireless control and automation in industrial factory environments, inter-vehicle communication for improved safety and efficiency, and the Internet of Things. URLLC is therefore important for 5G as it supports new business for the entire telecom industry.

[0004] One of the key characteristics of URLLC is low latency, which is a key point in making self-driving cars and remote surgery possible. Low latency allows the network to be optimized to handle an incredible amount of data with minimal delay or latency. The quality of service (QoS) required for URLLC is completely different from that of mobile broadband services.

[0005] URLLC guarantees a delay of 1 millisecond or less. Time-sensitive networking (TSN) is another component of 5G URLLC. All devices on a URLLC connection must be synchronized on the same time base. Techniques to support URLLC include, for example, integrated frame structure, incredible fast turnaround, efficient control and data resource sharing, grant-free based uplink transmission, and advanced channel coding schemes.

[0006] Technical problem

[0007] Channel state information (CSI) feedback enhancement functions in 3GPP Release 17 URLLC / Industrial Internet of Things (IIoT) WIs can select a more accurate modulation and coding scheme (MCS). In addition, in order to meet the low latency requirement of URLLC services, it is necessary to enhance the sub-band CSI reporting and reduce the complexity of the CSI reporting. SUMMARY

[0008] The purpose of the present application is to propose a method, a user equipment and a base station for channel state information (CSI).

[0009] In a first aspect of the present application, a method of channel state information (CSI) performed in a user equipment (UE), comprising determining which M subbands out of all subbands are selected according to a CQI reporting mode, wherein each subband comprises at least one physical resource block (PRB); determining a value of M; reporting at least one CQI value based on the M subbands to a base station (BS); and reporting locations of the M subbands to the BS.

[0010] In an embodiment of the present application, each of the M subbands has a CQI value, the determining which M subbands out of all subbands are selected comprises sorting the CQI values of all subbands; and selecting the M subbands with the worst M CQI values.

[0011] In an embodiment of the present application, the M subbands out of the subbands are randomly selected.

[0012] In an embodiment of the present application, M is configured by downlink control information (DCI), a higher layer parameter or a radio resource control (RRC) parameter.

[0013] In an embodiment of the present application, M is determined by a size of a bandwidth part (BWP).

[0014] In an embodiment of the present application, M is one-to-one related to a subband size.

[0015] In an embodiment of the present application, the reporting at least one CQI value based on the M subbands to a base station (BS) comprises reporting the CQI values of the M subbands to the BS.

[0016] In an embodiment of the present application, the reporting at least one CQI value based on the M subbands to a base station (BS) comprises reporting a statistical CQI value to the BS.

[0017] In an embodiment of the present application, the CQI statistical value comprises an average of the CQI values of the M subbands and a CQI variance of the M subbands.

[0018] In one embodiment of the present application, one of the maximum or minimum of the CQI values of the M subbands is reported together with the CQI statistics value.

[0019] In one embodiment of the present application, the bitmap size representing the M subband positions is and N is the total number of the subbands.

[0020] In one embodiment of the present application, based on the setting of the higher layer parameter reportQuantity, only at least one CQI value is reported to the BS.

[0021] In one embodiment of the present application, based on the setting of the higher layer parameter reportQuantity, the signal-to-interference-plus-noise ratio (SINR) is reported to the BS together with at least one CQI value.

[0022] In one embodiment of the present application, the subband offset level of each of the M subbands is defined as: subband offset level = subband CQI index - reference CQI index; the subband differential CQI value of each of the M subbands is obtained according to the subband offset level of each of the M subbands; wherein the reporting of at least one CQI value based on the M subbands to the base station (BS) comprises reporting the subband differential CQI value of each of the M subbands to the BS.

[0023] In one embodiment of the present application, the reference CQI index is the average of the CQI values of all subbands.

[0024] In one embodiment of the present application, the reference CQI index is one of the subbands with the best CQI value.

[0025] In one embodiment of the present application, the reference CQI index is one of the subbands with the worst CQI value.

[0026] In one embodiment of the present application, at least one reporting strategy for the reporting of at least one CQI value based on the M subbands to the base station (BS) is determined based on the size of the bandwidth part (BWP).

[0027] In one embodiment of the present application, at least one reporting strategy for the reporting of at least one CQI value based on the M subbands to the base station (BS) is determined based on the number of the subbands.

[0028] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with the ultra-reliable low-latency communication (URLLC) service.

[0029] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an enhanced mobile broadband, eMBB, service.

[0030] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an aperiodic CSI, A-CSI, report carried by a physical uplink control channel, PUCCH.

[0031] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an aperiodic CSI, A-CSI, report carried by a physical uplink shared channel, PUSCH.

[0032] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with one of an ultra-reliable low latency communication, URLLC, service and an enhanced mobile broadband, eMBB, service and one of an aperiodic CSI, A-CSI, report carried by a physical uplink control channel, PUCCH, an aperiodic CSI, A-CSI, report carried by a physical uplink shared channel, PUSCH, a semi-persistent CSI report carried by a physical uplink control channel, PUCCH, a semi-persistent CSI report carried by a physical uplink shared channel, PUSCH, and a periodic CSI report carried by a physical uplink control channel, PUCCH.

[0033] In a second aspect of the present application, a method of channel state information, CSI, performed in a base station, BS, comprises receiving at least one CQI value from a user equipment, UE, wherein the at least one CQI value is based on M subbands out of all subbands, each subband comprising at least one physical resource block, PRB; receiving a location of the M subbands from the UE; and selecting a modulation and coding scheme, MCS, for the UE according to the at least one CQI value and the location of the M subbands.

[0034] In one embodiment of the present application, M is configured by a downlink control information, DCI, a higher layer parameter or a radio resource control, RRC, parameter.

[0035] In one embodiment of the present application, M is determined by a size of a bandwidth part, BWP.

[0036] In one embodiment of the present application, M is one-to-one related to a subband size.

[0037] In one embodiment of the present application, the at least one CQI value is received based on a setting of a higher layer parameter, reportQuantity.

[0038] In one embodiment of the present application, the at least one CQI value and a signal to interference plus noise ratio, SINR, are reported to the base station, BS, based on a configuration of a higher layer parameter reportQuantity.

[0039] In a third aspect of the present application, a user equipment, UE, comprises a transceiver and a processor connected to the transceiver. The processor is configured to perform the following steps, comprising: determining which M subbands out of all subbands are selected according to a CQI reporting mode, wherein each subband comprises at least one physical resource block, PRB; determining a value of M; reporting at least one CQI value based on the M subbands to a base station, BS; and reporting locations of the M subbands to the BS.

[0040] In one embodiment of the present application, each of the M subbands has a CQI value, the determining which M subbands out of all subbands are selected comprises sorting the CQI values of all subbands; and selecting the M subbands with the worst M CQI values.

[0041] In one embodiment of the present application, the M subbands out of the subbands are randomly selected.

[0042] In one embodiment of the present application, M is configured by a downlink control information, DCI, a higher layer parameter or a radio resource control, RRC, parameter.

[0043] In one embodiment of the present application, M is determined by a size of a bandwidth part, BWP.

[0044] In one embodiment of the present application, M is one-to-one related to a subband size.

[0045] In one embodiment of the present application, the reporting at least one CQI value based on the M subbands to the base station, BS, comprises reporting the CQI values of the M subbands to the BS.

[0046] In one embodiment of the present application, the reporting at least one CQI value based on the M subbands to the base station, BS, comprises reporting a statistical CQI value to the BS.

[0047] In one embodiment of the present application, the CQI statistical value comprises an average of the CQI values of the M subbands and a CQI variance of the M subbands.

[0048] In one embodiment of the present application, one of a maximum or a minimum of the CQI values of the M subbands is reported together with the CQI statistical value.

[0049] In one embodiment of the present application, a bitmap size representing the locations of the M subbands is and N is a total number of the subbands.

[0050] In one embodiment of the present application, at least one CQI value is reported to the BS based on the setting of the higher layer parameter reportQuantity.

[0051] In one embodiment of the present application, a signal-to-interference-plus-noise ratio (SINR) is reported to the BS together with at least one CQI value based on the setting of the higher layer parameter reportQuantity.

[0052] In one embodiment of the present application, a sub-band offset level of each of the M sub-bands is defined as: sub-band offset level = sub-band CQI index - reference CQI index; a sub-band differential CQI value of each of the M sub-bands is obtained according to the sub-band offset level of each of the M sub-bands; and the reporting of at least one CQI value based on the M sub-bands to the base station (BS) comprises reporting the sub-band differential CQI value of each of the M sub-bands to the BS.

[0053] In one embodiment of the present application, the reference CQI index is an average of the CQI values of all sub-bands.

[0054] In one embodiment of the present application, the reference CQI index is one of the sub-bands with the best CQI value.

[0055] In one embodiment of the present application, the reference CQI index is one of the sub-bands with the worst CQI value.

[0056] In one embodiment of the present application, at least one reporting strategy for the reporting of at least one CQI value based on the M sub-bands to the base station (BS) is determined based on the size of a bandwidth part (BWP).

[0057] In one embodiment of the present application, at least one reporting strategy for the reporting of at least one CQI value based on the M sub-bands to the base station (BS) is determined based on the number of the sub-bands.

[0058] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an ultra-reliable low-latency communication (URLLC) service.

[0059] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an enhanced mobile broadband (eMBB) service.

[0060] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with an aperiodic CSI (A-CSI) report carried by a physical uplink control channel (PUCCH).

[0061] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with aperiodic CSI, A-CSI, reporting carried by a physical uplink shared channel, PUSCH.

[0062] In one embodiment of the present application, the priority of the CSI reported to the BS is associated with one of an ultra-reliable low latency communication, URLLC, service and an enhanced mobile broadband, eMBB, service and one of aperiodic CSI, A-CSI, reporting carried by a physical uplink control channel, PUCCH, aperiodic CSI, A-CSI, reporting carried by a physical uplink shared channel, PUSCH, semi-persistent CSI reporting carried by a physical uplink control channel, PUCCH, semi-persistent CSI reporting carried by a physical uplink shared channel, PUSCH, and periodic CSI reporting carried by a physical uplink control channel, PUCCH.

[0063] In a fourth aspect of the present application, a base station comprises a transceiver and a processor connected to the transceiver. The processor is configured to perform the following steps, comprising: receiving at least one CQI value from a user equipment, UE, wherein the at least one CQI value is based on M subbands out of all subbands, each subband comprising at least one physical resource block, PRB; receiving a location of the M subbands from the UE; and selecting a modulation and coding scheme, MCS, for the UE according to the at least one CQI value and the location of the M subbands.

[0064] In one embodiment of the present application, M is configured by downlink control information, DCI, a higher layer parameter, or a radio resource control, RRC, parameter.

[0065] In one embodiment of the present application, M is determined by a size of a bandwidth part, BWP.

[0066] In one embodiment of the present application, M is one-to-one related to a subband size.

[0067] In one embodiment of the present application, the at least one CQI value is received based on a setting of a higher layer parameter reportQuantity.

[0068] In one embodiment of the present application, a signal to interference plus noise ratio, SINR, and the at least one CQI value are received based on a setting of a higher layer parameter reportQuantity.

[0069] The disclosed method can be implemented in a chip. The chip can comprise a processor for invoking and running a computer program stored in a memory to cause a device installed with the chip to perform the disclosed method.

[0070] The disclosed method can be programmed as computer executable instructions stored in a non-transitory computer readable medium. The non-transitory computer readable medium instructs the processor of the computer to perform the disclosed method when loaded into the computer.

[0071] The non-transitory computer readable medium can include at least one from a group consisting of a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a read-only memory, a programmable read-only memory, an erasable memory programmable read-only memory, an EPROM, an electrically erasable programmable read-only memory, and a flash memory.

[0072] The disclosed method can be programmed as a computer program product, which causes a computer to perform the disclosed method.

[0073] The disclosed method can be programmed as a computer program, which causes a computer to perform the disclosed method.

[0074] Advantages

[0075] The present application proposes a UE-selected subband feedback mechanism to improve the performance of CSI reporting, especially for URLLC. The present application can improve resource utilization efficiency and the accuracy of CSI reporting, reduce the complexity and latency of CSI feedback.

[0076] In addition, an enhanced CSI reporting mechanism is also provided to more accurately select MCS. The present application can ensure that the CSI value can accurately express the current channel state, and reduce the signaling overhead of CSI reporting.

[0077] In addition, in order to adapt to different use cases or different traffic types, the present application also provides alternative designs of subband CSI reporting strategies. The current subband CSI feedback is based on differential feedback to reduce overhead, and reports a 2-bit incremental CQI index on the wideband CQI. However, this will result in a large and inaccurate granularity of CSI reporting, especially in the case of frequency-selective channel conditions. To solve this problem, the present application introduces several enhanced subband feedback methods to improve the existing differential subband CSI reporting. In addition, several CQI reporting strategies are also proposed to achieve more accurate CSI feedback and achieve high spectral efficiency or reliable transmission.

[0078] In addition, the present application also provides enhanced priority rules for CSI reporting to ensure the CSI reporting of URLLC traffic services. Since the existing priority rules are not friendly to URLLC services, for example, P / SP-CSI reporting on PUCCH is considered to be the lowest priority even if it is adapted for URLLC traffic links. Therefore, in order to ensure the high reliable transmission of URLLC services and adapt to the potential new features of Release-17, the existing priority rules need to be improved. BRIEF DESCRIPTION OF DRAWINGS

[0079] To further illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the following drawings are only some embodiments of the present application. Any person skilled in the art can obtain other drawings without paying any cost based on these drawings.

[0080] Figure 1 is a schematic diagram of a telecommunications system.

[0081] Figure 2 is a schematic diagram showing a CRAN with a pool of baseband units, a remote radio head, and a UE.

[0082] Figure 3 is a schematic diagram showing a method of performing channel state information at a user equipment (UE) according to an embodiment of the present application.

[0083] Figure 4 is a schematic diagram showing a disclosed method of performing at a base station (BS) according to an embodiment of the present application.

[0084] Figure 5 is a block diagram of a system for wireless communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0085] The technical matters, structural features, achieved purposes and effects of the embodiments of the present application will be described in detail below with reference to the drawings. Specifically, the terms used in the embodiments of the present application are only for the purpose of illustrating the embodiments of the present application and do not limit the present application.

[0086] Referring to Figure 1 , a telecommunications system including a group of multiple UEs 100a, a base station (BS) 200a, and a network entity device 300 performs the disclosed method according to an embodiment of the present application. The group of multiple UEs 100a can include a UE 10a, a UE 10b, and other UEs. Figure 1The system is illustrative and not restrictive, and the system can include more UEs, BSs, and CN entities. Connections between devices and device components are shown with lines and arrows in the figures. Connections between devices can be implemented through wireless connections. Connections between device components can be implemented through wired lines, buses, traces, cables, or optical structures. The UE 10a can include a processor 11a, a memory 12a, and a transceiver 13a. The UE 10b can include a processor 11b, a memory 12b, and a transceiver 13b. The base station 200a can include a baseband unit (BBU) 204a. The baseband unit 204a can include a processor 201a, a memory 202a, and a transceiver 203a. The network entity device 300 can include a processor 301, a memory 302, and a transceiver 303. Each of the processors 11a, 11b, 201a, and 301 can be configured to implement the proposed functions, procedures, and / or methods described in the description. Radio interface protocol layers can be implemented in the processors 11a, 11b, 201a, and 301. Each of the memories 12a, 12b, 202a, and 302 is operable to store various programs and information for operating the connected processors. Each of the transceivers 13a, 13b, 203a, and 303 is operably coupled with the connected processors, transmits and / or receives radio signals or wired signals. The UE 10a can communicate with the UE 10b through a sidelink. The base station 200a can be one of an eNB, a gNB, or other types of radio nodes.

[0087] Each of the processors 11a, 11b, 201a, and 301 can include a central processing unit (CPU), an application-specific integrated circuit (ASIC), other chip sets, logic circuitry, and / or a data processing device. Each of the memories 12a, 12b, 202a, and 302 can include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and / or other storage devices. Each of the transceivers 13a, 13b, 203a, and 303 can include baseband circuitry and radio frequency (RF) circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules, units, processes, functions, entities, etc. performing the functions described herein. The modules can be stored in the memories and executed by the processors. The memories can be implemented within the processors or external to the processors, in which those can be communicatively coupled to the processors via various means as is known in the art.

[0088] The network entity device 300 can be a node in a CN. The CN can include a LTE CN or a 5G core (5GC) including a user plane function (UPF), a session management function (SMF), a mobility management function (AMF), a unified data management (UDM), a policy control function (PCF), a control plane (CP) / user plane (UP) split (CUPS), an authentication server (AUSF), a network slice selection function (NSSF), a network exposure function (NEF).

[0089] With reference to Figure 2 The base station 200b is one embodiment of the base station 200a and includes a central controller (CC) 210, access points 211-1, 211-2,..., and 211-M. M is a positive integer. The central controller 210 can be implemented in a central unit (CU) and can include a BBU, e.g., the BBU 204a, related to the access points (APs) 211-1, 211-2,..., and 211-M. Each access point 211-1, 211-2,..., and 211-M can be implemented as a radio node, a remote unit (RU), or a remote radio head (RRH) and can include a transmission and reception point (TRP). The access points 211-1, 211-2,..., and 211-M can be located at different locations.

[0090] The central controller 210 receives wireless signals from a set of V user equipment (UEs) 100b by a set of M distributed radio nodes. V is a positive integer. The set of V user equipment includes the UEs 10-1, 10-2, 10-3, and..., 10-V. The UEs 10-1, 10-2, 10-3, and..., 10-V can be located at different locations.

[0091] The technical problem considered belongs to the field of high-density connectivity and non-orthogonal multiple access (NOMA) in a CRAN system. In an example, the CRAN network operates in a time division duplex (TDD) mode, where channel estimation is performed through uplink pilot transmission.

[0092] Each coherence time slot is divided into two uplink training instances using orthogonal uplink pilots, uplink and downlink data transmission. Embodiments of the invention deal with uplink from V UEs to M single-antenna access points (APs). At each time slot, each AP independently performs uplink channel estimation.

[0093] The APs 211-1, 211-2,..., and 211-M are distributed within a coverage area and are managed by a central controller 210, which contains a centralized baseband unit (BBU) pool and handles operations of the physical layer and the medium access control (MAC) layer, such as data decoding and encoding, scheduling, and power allocation. The APs 211-1, 211-2,..., and 211-M are linked to the central controller 210 through a high-performance transport link, called fronthauling. The fronthauling can be implemented through optical cables or high-bandwidth wireless channels. Figure 2 includes the base station 200b and the UEs 10-1, 10-2, 10-3, and... 10-V. The UEs 10-1, 10-2, 10-3, and... 10-V are a simplified example of a CRAN. The APs 211-1, 211-2,..., and 211-M perform channel estimation and link-level transport chain up to equalization. The central controller 210 performs signal decoding, encoding, modulation, demodulation, scheduling, and MAC layer operations.

[0094] Uplink (UL) transmission of control signals or data can be a transmission operation from a UE to a base station. Downlink (DL) transmission of control signals or data can be a transmission operation from a base station to a UE.

[0095] Regarding the CSI reporting mechanism in 3GPP Release 16, as stated in Section 5.2.1.1 of 38.214:

[0096] The time domain behavior of a CSI-ReportConfig is indicated by the higher layer parameter reportConfigType, which can be set to "aperiodic", "semiPersistentOnPUCCH", "semiPersistentOnPUSCH", or "periodic". For periodic and semiPersistentOnPUCCH / semiPersistentOnPUSCH CSI reporting, the configured periodicity and slot offset apply to the numerology of the UL BWP on which the CSI report is configured to be transmitted. The higher layer parameter reportQuantity indicates the number of CSI-related, L1-RSRP-related, or L1-SINR-related quantities to be reported. The reportFreqConfiguration indicates the reporting granularity in frequency domain, including the CSI reporting band and whether the PMI / CQI reporting is wideband or subband. The parameter timeRestrictionForChannelMeasurements in CSI-ReportConfig can be configured to enable time domain restriction for channel measurements, and timeRestrictionForInterferenceMeasurements can be configured to enable time domain restriction for interference measurements. CSI-ReportConfig can also contain a CodebookConfig, which contains the configuration parameters for Type-I, Type II, or enhanced Type II CSI, including codebook subset restriction and group-based reporting configuration.

[0097] Table 1 (TS 38.214) below introduces one method of subband partitioning:

[0098] For CSI reporting, the UE can be configured by higher layer signaling to one of two possible subband sizes, where a subband is defined as consecutive PRBs and depends on the total number of PRBs of the bandwidth part, as shown in Table 5.2.1.4-2.

[0099] Table 1

[0100] Bandwidth part (PRB) Subband size (PRB) 24-72 4,8 73-144 8,16 145-275 16,32

[0101] CSI reporting in frequency domain can be wideband reporting or subband reporting, determined by the higher layer parameter reportFreqConfiguration. Subband partitioning is based on the size of the bandwidth part (BWP). Considering the stringent requirements on delay and reliability of URLLC services, the traditional reporting mechanism is not sufficient, especially the traditional low latency CSI is limited to wideband reporting. In order to have a more accurate MCS selection mechanism and improve the QoS requirements of URLLC, the existing CSI reporting scheme needs to be improved.

[0102] In LTE system, there are two subband CQI reporting methods: high layer configured subband feedback and UE selected subband feedback. In high layer configured subband feedback, the subband division is determined by the size of BWP, and UE reports a wideband CQI value and a subband offset level for each subband to the base station. In UE selected subband feedback, UE can select M preferred subbands with size k, and report the average of CQI values of M subbands and the index of M subbands to the base station. The value of M is related to the system bandwidth. It is beneficial to introduce UE selected subband feedback for URLLC service in NR, because UE selected subband feedback can bring more flexibility for CSI reporting. Moreover, if UE can select M subbands that can better represent the current channel quality, it is also beneficial for the base station to select more accurate MCS selection. Since CSI reporting is more likely to be used for retransmission. In order to ensure the stability of data transmission, the scheduling configuration of retransmission information is more important. Therefore, the UE selected subband feedback mechanism can be the baseline, and the present application provides enhanced UE selected subband feedback for more accurate MCS selection.

[0103] Reference Figure 3 A UE, such as one of the UEs 10a or 10b, performs a method for channel state information (CSI).

[0104] At operation S300, the UE determines which M subbands among all subbands to select according to a CQI reporting mode. The CQI reporting mode is used to indicate the rule of selecting M subbands. Each subband includes at least one physical resource block (PRB).

[0105] Each subband has a CQI value. In one embodiment, the UE determines to select M subbands with the best M CQI values. Specifically, the UE sorts the CQI values of all subbands, and selects M subbands with the best M CQI values. This embodiment can be directly used in LTE, and has less impact on the standard.

[0106] In another embodiment, the UE determines to select M subbands with the worst M CQI values. Specifically, the UE sorts the CQI values of all subbands, and selects M subbands with the worst M CQI values. This embodiment can still be applied to retransmission (to assist in adjusting MCS selection), repetition (to assist in adjusting power allocation), or transmission of the next physical downlink shared channel (PDSCH) (for example, when a large data packet is split into several code words (CWs), which are carried on consecutive PDSCHs, or to protect new data packets in the next PDSCH in the case of allowed survival time). In this embodiment, in order to ensure the reliability of retransmission, especially for URLLC service, M subbands with the worst M CQI values should be more conservative.

[0107] In yet another embodiment, the UE randomly selects M subbands or selects M subbands that can reflect the current channel state according to a predefined algorithm.

[0108] Any combination of the above three embodiments is possible. That is, to adapt to different scenarios, the above three embodiments can be supported at the same time, and the parameter is CQI report mode (CQIReportMode). For example, when CQIReportMode = 0, it means that the M subbands with the best M CQI values are selected. When CQIReportMode = 1, it means that the M subbands with the worst M CQI values are selected. When CQIReportMode = 2, it means that the UE selects M subbands. CQIReportMode can be configured by DCI or a higher layer parameter.

[0109] In operation S302, the UE determines the value of M.

[0110] In one embodiment, M is configured by downlink control information (DCI) or a higher layer parameter. The higher layer parameter can be, but is not limited to, a radio resource control (RRC) parameter. This embodiment has less impact on the standard, but also introduces additional signaling overhead.

[0111] To avoid additional signaling overhead, in another embodiment, the value of M can be determined by the size of the BWP. The mapping table of the subband size and the BWP can increase a dimension, i.e., the value of M, as shown in Table 2:

[0112] Table 2

[0113] Bandwidth part (PRB) Subband size (PRB) M 24-72 4,8 X1 73-144 8,16 X2 145-275 16,32 X3

[0114] It can be assumed that M of each subband size level only supports three values (X1, X2, and X3). The values of X1, X2, and X3 can be configurable or preconfigured in the UE.

[0115] In yet another embodiment, the value of M is one-to-one related to the subband size, as specified in Table 3. In the subband size configuration, the BWP range of each level corresponds to two subband sizes, and the specific subband size is configured by the higher layer parameter subbandSize (configured in the RRC IE CSI-ReportConfig). Therefore, the higher layer parameter subbandSize can also be used to determine the value of M. For example, the subbandSize is configured to be 4, and the BWP size is 30, then the corresponding value of M is Y1. For another example, the subband size is configured to be 16, and the BWP size is 100, then the value of M is Y4. It should be noted that the value of M is an integer and is not less than 1.

[0116] Table 3

[0117] Bandwidth part (PRB) Subband size (PRB) M 24-72 4,8 Y1, Y2 73-144 8,16 Y3, Y4 145-275 16,32 Y5, Y6

[0118] Alternatively, the determination of M can also be configured by another higher layer parameter or by DCI, which means the value of M and the subband size do not use the same parameter subbandSize. Then a new parameter ReportSubbandNum should be introduced. ReportSubbandNum is a 1-bit parameter. When ReportSubbandNum = 0, it means the previous value (e.g. Y1 or Y3 or Y5) is selected. When ReportSubbandNum = 1, it means the next value (e.g. Y2 or Y4 or Y6) is selected.

[0119] In operation S304, the UE reports at least one CQI value based on the M subbands to the BS.

[0120] In one embodiment, the UE reports CQI values of the M subbands to the BS. Compared with the traditional subband reporting mechanism, this embodiment can bring significant benefits for resource efficiency, because there is no need to report all CQI values of all subbands, and the CQI values of the M subbands can convey the current channel status.

[0121] In another embodiment, the UE reports an average value of CQI values of the M subbands to the BS. That is, only one CQI value is reported to the BS. Compared with the above-mentioned embodiment, this further reduces the signaling overhead. It is also equivalent to processing the reported CQI value at the UE side, so that the BS side does not need additional algorithms to process the CQI value. The BS can make MCS selection based on this average value of CQI values of the M subbands.

[0122] In yet another embodiment, the UE reports a statistical CQI value to the BS. For sporadic traffic, filtering or average measurement reporting can better combat interference uncertainty. Therefore, in this embodiment, a statistical CQI value should be reported to the BS. For example, a CQI statistical value including the average value of CQI values of the M subbands and the CQI variance of the M subbands should be reported. In addition, the maximum or minimum value of the CQI values of the M subbands can be optionally reported together with the statistical CQI value.

[0123] In operation S306, the UE reports the positions of the M subbands to the BS. Operation S306 can help make decisions about MCS selection, because this information is unknown to the BS. The original reporting mechanism of the positions of the M subbands in LTE is the combined index reporting. As shown in the following figure, the total number of subbands is considered to be N, and the number of selected subbands is M.

[0124] The combined index r is defined as:

[0125]

[0126] wherein: comprises M ordered subband indices and is an extended binomial coefficient, resulting in a unique tag and

[0127]

[0128] the number of bits representing M selected subband positions is

[0129] The above method can be reused or as a baseline in NR, but the signaling overhead of this reporting manner is very large. At least the number of bits reserved for this combination index is very large. According to the current configuration manner (as shown in Table 1), the maximum number of subbands is 18. When this manner is used for reporting, the number of bits required when the number of selected M subbands is more than 1 (M>1) can exceed Therefore, another scheme is proposed in the present application, i.e. using a bitmap to represent the positions of M subbands. The size of this bitmap is Each field in this bitmap represents the state of each subband. For example, the field is set to 1 to indicate that the subband is selected for CQI calculation. The field is set to 0 to indicate that the subband is not selected. There are a total of M fields in this bitmap that are set to 1. In this case, the position information reported at most will not exceed For example, if the current number of subbands is 18, then at most bits are required.

[0130] The present application proposes a UE-selected subband feedback mechanism to improve the performance of CSI reporting, especially for URLLC. The present application can improve the resource utilization efficiency and the accuracy of CSI reporting, and reduce the complexity and delay of CSI feedback.

[0131] Regarding the recent CQI reporting mechanism in Release-16, when wideband CQI reporting is configured, a wideband CQI value is reported for each codeword across the entire CSI reporting band. When subband CQI reporting is configured, one CQI value is reported for each codeword in each subband in the CSI reporting band. For wideband reporting, it can only indicate the overall condition of the CQI value across the wideband. For a communication environment with large channel or interference fluctuation, the wideband CQI value cannot be used as a reference for the BS. For subband, although the respective CQI value of each subband is reported, the signaling overhead is relatively large. For CQI reporting, there is a trade-off between signaling overhead and accurate representation of channel quality. For the above two cases, reporting a CQI statistic value is a compromise solution. The CQI statistic value can be the average of all subband CQI values and CQI variance, and optionally, the maximum or minimum CQI value can be reported together with the statistic CQI value. In this case, at most four CQI values should be reported, which greatly reduces the complexity of CQI reporting compared to subband CQI reporting. In addition, this solution can also be combined with differential CQI reporting.

[0132] The above-mentioned statistical CQI reporting can be another reporting method, equivalent to wideband reporting or subband reporting. It can also be reported as auxiliary information together with wideband reporting or subband reporting.

[0133] In addition, due to the rapid load fluctuation of adjacent cells, the signal-to-signal-plus-noise ratio (SINR) experienced by the UE is also highly time-varying. That is, if the UE performs SINR measurement on a set of PRBs in a certain time period, the SINR can change greatly in another time period. Therefore, it is a challenge to accurately track the SINR experienced by the UE due to various delays between the UE and the BS, such as measurement delay, CSI reporting delay, and processing delay on the BS side. These rapid changes in SINR in the time and frequency domains also affect the accuracy of CSI reporting, especially for frequency-selective cases. In this case, the statistical SINR result can be reported together with the corresponding CQI report. From the perspective of the UE, the calculation of the CQI value is left to the UE implementation. However, it does have a mapping relationship with the MCS selection and SINR, and this SINR can be reported to the BS for more accurate MCS selection. Alternatively, this SINR can be the SINR or a statistical value when determining the CQI value, such as the average of the SINR and the variance of the SINR.

[0134] It should be noted that the reference point for UE measurement (e.g. L1-SINR) in Release 16 is the antenna connector (for FR1). However, the SINR introduced in this invention is for MCS selection. It is different from the SINR distribution at the antenna connector, it does not take into account the number of Rx antennas, nor does it take into account the gain that the Rx architecture can provide through combining techniques (e.g. MRC / IRC) and / or channel estimation techniques and / or decoding techniques (linear / non-linear receiver).

[0135] To reduce the CSI reporting time, especially for URLLC traffic, a simplified CSI reporting can be supported. For example, only CQI value is reported. This is because for some urgent transmissions, it is not necessary to report all types of CSI, only some key information is enough, which not only reduces the complexity of CSI reporting, but also correspondingly reduces the time of CSI reporting. In addition, SINR can be reported as auxiliary information together with CQI report for more accurate MCS selection. In this case, a new parameter should be introduced for the higher layer parameter reportQuantity. When the higher layer parameter reportQuantity is set to ‘CQI’, only CQI value is reported. When the higher layer parameter reportQuantity is set to ‘CQI-SINR’, both CQI value and SINR are reported.

[0136] The above enhanced CSI reporting mechanism is also provided in order to more accurately select MCS. The invention can ensure that the CSI value can accurately express the current channel state, and reduce the signaling overhead of CSI reporting.

[0137] The recent CSI reporting mechanism for low latency CSI is more likely to be configured as wideband reporting. However, many URLLC applications are limited to small data packet transmission, usually only occupying one or a few subbands. Therefore, subband CSI is more suitable for URLLC services. The current subband CSI feedback is based on differential feedback for reducing overhead, and reports 2-bit incremental CQI index on wideband CQI. However, this will result in a large and inaccurate granularity of CSI reporting, especially in the case of frequency selective channel conditions. Assuming that the BS will make MCS selection according to the rough CSI report, this will result in low spectral efficiency or unreliable transmission. In order to solve this problem, an enhanced subband feedback method should be introduced to achieve more accurate CSI feedback.

[0138] configured by higher layer parameter cqi-FormatIndicator. When wideband CQI reporting is configured, a wideband CQI value is reported for each codeword for the whole CSI reporting band. When subband CQI reporting is configured, one CQI value is reported for each codeword for each subband in the CSI reporting band, and a 2-bit subband differential CQI is defined for each subband. For small packet scheduling or traffic type that only occupies a few subbands, wideband CQI calculation is unnecessary, because the difference between wideband CQI value and subband CQI value will not be too large. For large data transmission, the difference between wideband CQI value and subband CQI value can be large. If the current CQI offset mapping table is used, only four levels of subband differential CQI values can be roughly reflected. Therefore, the differential CQI reporting strategy needs to be improved. In view of this problem, the present application provides the following solutions.

[0139] Firstly, the basis of differential CQI calculation and comparison should be modified. It has been analyzed above that it is not practical to use wideband CQI value for comparison. The reference can be the average CQI value of all subbands, which can better reflect the overall level of subband CQI value. For other subband CQI values, differential CQI is calculated on the basis of this average CQI, and the data distribution will not fluctuate too much, which will not bring additional signaling overhead. In this case, for each subband index s, the subband differential CQI is defined as:

[0140] Subband offset level = subband CQI index - average CQI index.

[0141] Optionally, the reference CQI index can also be the best CQI value of all subbands or the worst CQI value of all subbands, depending on the case or application scenario. In this way, according to different scenarios or configurations, the BS side can better obtain the current subband CQI distribution. The subband differential CQI value is defined as:

[0142] Subband offset level = subband CQI index - reference CQI index.

[0143] In this case, the reference CQI index is configurable, which can be the average CQI value of all subbands or the best CQI or worst CQI value, configured by DCI or higher layer parameter.

[0144] Secondly, the current table used to map subband differential CQI value to offset level is too rough and cannot accurately report CSI. At least for URLLC, it needs a new mapping table with smaller granularity. As specified in Table 4, D subband differential CQI values should be supported, where D > 4. The L value and offset level range of each differential CQI value are configurable.

[0145] Table 4

[0146] Subband differential CQI value Offset level 0 [O1-O2] 1 [O3-O4] … … D-1 O k ~O k+1 ]]

[0147] For one embodiment specified in Table 5, we assume D = 8, which means the subband differential CQI value is a 3-bit parameter. The mapping relationship between the subband differential CQI value and the offset level is shown in Table 5.

[0148] Table 5

[0149] Subband differential CQI value Offset level 0 0 1 1 2 2～4 3 4～8 4 ≧8 5 -1～-4 6 -4～-8 7 ≦-8

[0150] For one embodiment specified in Table 5, we assume D = 8, which means the subband differential CQI value is a 3-bit parameter. The mapping relationship between the subband differential CQI value and the offset level is shown in Table 5.

[0151] For the reporting strategy of subband CQI, if the same strategy is used for all scenarios, there is a limitation. One strategy cannot be suitable for all scenarios. Therefore, the strategy can be adaptively changed according to different scenarios to achieve the best performance.

[0152] In one embodiment, the CQI reporting strategy is closely related to the BWP size. When the BWP size is small, the difference between the wideband CQI value and the subband CQI value is not large. At this time, there is not much benefit to use the differential CQI report based on the wideband CQI value. However, when the BWP is large, the differential CQI report calculated based on the wideband CQI value can better reflect the overall level of the CQI value, achieving the purpose of reducing the reporting signaling. Therefore, the CQI reporting strategy can be determined by the BWP size, as shown in Table 6, which introduces the mapping relationship between the BWP size and the reporting strategy.

[0153] Table 6

[0154] Bandwidth part (PRB) Reporting strategy [B1-B2]

[00100] S1 <![CDATA[B2+1~B3]]> [S2] … … B n +1~B n+1 ]]> [SA n ]]

[0155] There are n strategies in Table 6, denoted as S i, where 1≤i≤n, and the specific strategy represented by S i can be configured.

[0156] In one embodiment, as shown in Table 7, when n = 2, the subband CQI report only supports two reporting strategies. When the BWP is less than 144 PRBs, differential CQI reporting is not supported, that is, the actual CQI value of the subband is reported instead of the difference from the reference CQI value. When the BWP size is greater than 144 PRBs, differential CQI reporting is supported, and the reference CQI value is configurable, which can be a wideband CQI or an average CQI or other.

[0157] Table 7

[0158] Bandwidth part (PRB) Reporting strategy 24-144 No differential CQI reporting 145-275 Differential CQI reporting

[0159] In another embodiment, when n=3, the mapping between BWP size and reporting strategy is shown in Table 8. For this case, when the BWP is below 72 PRBs, differential CQI reporting is not supported. When the BWP is between 73 and 144 PRBs, differential CQI reporting is supported, and the reference CQI value can be any CQI value other than the wideband CQI value (configured by DCI or higher layer). When the BWP is larger than 145 PRBs, differential CQI reporting based on the wideband CQI value is supported.

[0160] Table 8

[0161] Bandwidth part (PRB) Reporting strategy 24-72 No differential CQI reporting 73-144 Differential CQI reporting without wideband CQI value 145-275 Differential CQI reporting with wideband CQI value

[0162] In another embodiment, another solution is to determine the reporting strategy based on the number of subbands. This solution is actually more intuitive, because for the case of small number of subbands, the advantage of calculating the differential CQI value based on the wideband CQI value is small. In the case of a large number of subbands, the traditional strategy can be used, and the differential CQI reporting is based on the wideband CQI value. In this case, a threshold is introduced, which can be defined as SubbandNum. This parameter can be pre-configured (e.g., SubbandNumThe=9) or configured by DCI or a higher layer parameter (e.g., RRC). When the number of subbands is below SubbandNum, differential CQI reporting is not supported, and the actual CQI value of the subband is reported instead of the difference from the reference CQI value. When the number of subbands is below SubbandNum, differential CQI reporting is supported, and the reference CQI value is configurable, which can be configured as the wideband CQI value or the average CQI value or other.

[0163] Similarly, it can be further refined, as shown in Table 9, to divide multiple levels for the number of subbands, and configure the corresponding reporting strategy for the number of subbands in different value ranges. Similar to Table 6, there are n strategies, denoted as Si, where 1≤i≤n, and the specific strategy represented by Ri can be configured.

[0164] Table 9

[0165] Subband number Reporting strategy [M1-M2] [R1] [M2+1~M3] [R2] … …

[0166] In an embodiment, when n=3, the mapping between the number of subbands and the reporting strategy is shown in Table 10. For this case, when the number of subbands is below 3, differential CQI reporting is not supported. When the number of subbands is between 4 and 9, differential CQI reporting is supported, and the reference CQI can be any CQI value other than the wideband CQI value (configured by DCI or higher layer). When the number of subbands is greater than 10, differential CQI reporting based on the wideband CQI is supported.

[0167] Table 10

[0168] Subband number Reporting strategy 1-3 No differential CQI reporting 4-9 Differential CQI reporting without wideband CQI value ≧10 Differential CQI reporting with wideband CQI value

[0169] Current subband CSI feedback is based on differential feedback for reducing overhead, and 2-bit delta CQI index on wideband CQI is reported. However, this can result in a large and inaccurate granularity of CSI reporting, especially under frequency-selective channel conditions. To address this issue, the present invention introduces the above-mentioned subband CSI reporting strategy (enhanced subband feedback method) to improve the existing differential subband CSI reporting. In addition, the above-mentioned CQI reporting strategy is also proposed to achieve more accurate CSI feedback and result in high spectral efficiency or reliable transmission.

[0170] P / SP-CSI on PUCCH is considered to be the lowest priority compared to other CSI reporting types, and there is no priority index associated with the CSI reporting configuration. Therefore, even for URLLC traffic link adaptation, if it conflicts with a higher priority CSI report (e.g., A-CSI report, SP-CSI on PUSCH), it can be dropped regardless of whether the higher priority CSI report is for eMBB or URLLC. Therefore, the priority rule for CSI reporting needs to be improved, and P / SP-CSI on PUCCH needs to be associated with a priority index.

[0171] Regarding Release-16, the priority of CSI reporting is defined as shown below (Section 5.2.5 of 38.214):

[0172] The CSI report is associated with a priority value Pri iCSI(y,k,c,s) = 2·N calls·M s·y+Ncells·M s·k+M s·c+s, where

[0173] - y = 0 for aperiodic CSI report carried on PUSCH, y = 1 for semi-persistent CSI report carried on PUSCH, y = 2 for semi-persistent CSI report carried on PUCCH, y = 3 for periodic CSI report carried on PUCCH;

[0174] - k = 0 for CSI report carrying L1-RSRP or L1-SINR, k = 1 for CSI report not carrying L1-RSRP or L1-SINR;

[0175] - c is the serving cell index, Ncells is the value of the higher layer parameter maxNrofServingCells;

[0176] - s is the reportConfigID, M is the value of the higher layer parameter maxNrofCSI-ReportConfigurations.

[0177] If the associated Pri iCSI(y, k, c, s) value of the first report is lower than the second report, the first CSI report is said to have priority over the second CSI report.

[0178] On the basis of the priority rule of Release-16, the present application provides the following alternative design.

[0179] In one embodiment, with respect to the latest specification, when P / SP-CSI on PUCCH collides with other UL transmissions, it is always considered as the lowest priority, even if it is URLLC traffic. However, such a provision is unreasonable. Due to the high reliability and low latency of URLLC, when a collision occurs, the transmission of URLLC service should be guaranteed as much as possible. Therefore, in order to solve this problem, the present disclosure provides the following priority rule.

[0180] CSI report is associated with a priority value Pri iCSI(y, k, c, s) = 2 · N cells · M s · 4 · t + 2 · N cells · M s · y + N cells · M s · k + M s · c + s where

[0181] · t = 0 for URLLC service

[0182] · t = 1 for eMBB service.

[0183] In another embodiment, the subject of A-CSI on PUCCH was previously discussed in previous versions, however, due to time constraints and lack of consensus on the triggering mechanism, this subject was eventually excluded from NR Release-16. The main motivation for introducing A-CSI on PUCCH is to allow the base station (e.g. gNB) to have greater scheduling flexibility and lower signaling overhead. Therefore, the CSI priority rule should take into account the A-CSI on PUCCH, and considering that the A-CSI on PUCCH is most likely to be used for URLLC service, it should have a higher priority, and the following solution is provided.

[0184] CSI report is associated with a priority value Pri iCSI(y, k, c, s) = 2 · N cells · M s · 4 · t + 2 · N cells · M s · y + N cells · M s · k + M s · c + s where

[0185] · y = 0 indicates that the aperiodic CSI report carried on PUCCH;

[0186] · y = 1 indicates that the aperiodic CSI report is carried on PUSCH;

[0187] · y = 2 indicates that the semi-persistent CSI report is carried on PUSCH;

[0188] • y = 3 for semi-persistent CSI report carried on PUCCH;

[0189] • y = 4 for periodic CSI report to be carried on PUCCH.

[0190] In another embodiment, the above two embodiments can also be used in combination. The merged solution is as follows.

[0191] The CSI report is associated with a priority value Pri iCSI(t, y, k, c, s) = 2 · N cells · M s · 5 · t + 2 · N cells · M s · y + N cells · M s · k + M s · c + s where

[0192] • t = 0 for URLLC service.

[0193] t = 1 for eMBB service

[0194] • y = 0 indicates an aperiodic CSI report carried on PUCCH;

[0195] y = 1 indicates an aperiodic CSI report carried on PUSCH;

[0196] y = 2 for semi-persistent CSI report carried on PUSCH;

[0197] y = 3 for semi-persistent CSI report carried on PUCCH;

[0198] y = 4 for periodic CSI report to be carried on PUCCH.

[0199] The above enhanced CSI reporting priority rule can guarantee the CSI reporting of URLLC traffic service. Since the existing priority rule is not friendly to URLLC service, for example, P / SP-CSI reporting on PUCCH is considered to be the lowest priority even for URLLC traffic link adaptation. Therefore, in order to guarantee the high reliable transmission of URLLC service, adapt to the potential new features of Release-17, the existing priority rule needs to be improved.

[0200] Reference Figure 4 A BS, such as one of the BSs 200a or 200b, performs a method for channel state information (CSI).

[0201] In operation S400, the BS receives at least one CQI value from a user equipment (UE), wherein the at least one CQI value is based on M subbands out of all subbands, and each subband includes at least one physical resource block (PRB).

[0202] In one embodiment, M is configured by downlink control information (DCI). In another embodiment, M is configured by a higher layer parameter. The higher layer parameter is a radio resource control (RRC) parameter.

[0203] In one embodiment, M is determined by a size of a bandwidth part (BWP). In another embodiment, M is a one-to-one relation with a subband size.

[0204] At operation S402, the BS receives the location of the M subbands from the UE.

[0205] In one embodiment, only at least one CQI value is received. In another embodiment, a signal to interference plus noise ratio (SINR) and at least one CQI value are received.

[0206] At operation S404, the BS selects a modulation and coding scheme (MCS) for the UE according to the at least one CQI value and the location of the M subbands.

[0207] Any combination of the above embodiments is possible.

[0208] Figure 5 FIG. 1 is a block diagram of a system for wireless communication according to an embodiment of the application. The embodiments described herein can be implemented into a system using any suitable configuration of hardware and / or software. Figure 5 An example system 700 for one embodiment is shown. The system 700 includes radio frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory / storage 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are each communicatively coupled via one or more buses 790 (only one of which is shown for simplicity).

[0209] The application circuitry 730 can include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor(s) can include any combination of general-purpose processors and dedicated processors such as graphics processors, application processors, and so on. The processor(s) can be coupled with memory / storage and configured to execute instructions stored in the memory / storage to enable various applications and / or operating systems to run on the system.

[0210] The baseband circuitry 720 can include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors can include a baseband processor. The baseband circuitry can handle various radio control functions. The radio control functions can include, but are not limited to, signal modulation, coding, encoding, radio frequency shifting, and the like. In some embodiments, the baseband circuitry can provide control delay reduction. In some embodiments, the baseband circuitry can include a digital baseband and / or analog baseband. In some embodiments, the baseband circuitry can include circuitry to operate according to any of a plurality of wireless protocols. In some embodiments, the baseband circuitry is configured to operate according to multiple wireless protocols. In some embodiments, the baseband circuitry is implemented as a multi-chip module (MCM), with radio frequency (RF) circuitry and / or front-end module (FEM) on a same die as the baseband circuitry. In some embodiments, the baseband circuitry is implemented as a system on a chip (SoC) with radio frequency (RF) circuitry and / or front-end module (FEM) on a same die as the baseband circuitry.

[0211] The RF circuitry 710 can enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry can include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 can include circuitry to operate according to one or more wireless protocols. In some embodiments, the RF circuitry is configured to operate according to multiple wireless protocols. In some embodiments, the RF circuitry is implemented as a multi-chip module (MCM), with radio frequency (RF) circuitry and / or front-end module (FEM) on a same die as the baseband circuitry. In some embodiments, the RF circuitry is implemented as a system on a chip (SoC) with radio frequency (RF) circuitry and / or front-end module (FEM) on a same die as the baseband circuitry.

[0212] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to a user equipment, eNB, or gNB can be embodied in whole or in part within one or more of the RF circuitry, baseband circuitry, and / or application circuitry. As used herein, “circuitry” can refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and / or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry can be implemented in one or more software or firmware modules executed by the circuitry. In some embodiments, some or all of the constituent

[0213] Memory / storage 740 can be used to load and store information (e.g., data and / or instructions) that can be used by system. Memory / storage 740 of one embodiment can include any combination of suitable volatile memory and / or non-volatile memory such as dynamic random access memory (DRAM) and / or non-volatile memory such as flash memory. In various embodiments, I / O interface 780 can include one or more user interfaces designed to enable user interaction with system and / or peripheral device interfaces designed to enable peripheral device interaction with system. User interfaces can include, but are not limited to, physical keyboards or keypads, touch pads, speakers, microphones, etc. Peripheral device interfaces can include, but are not limited to, non-volatile memory port, USB port, audio jack, and power supply interface.

[0214] In various embodiments, sensors 770 can include one or more sensing devices to determine environmental conditions and / or location information related to system. In some embodiments, sensors can include, but are not limited to, gyroscopes, accelerometers, proximity sensors, ambient light sensors, and positioning units. Positioning units can also be part of or interact with baseband circuitry and / or RF circuitry to communicate with elements of a positioning network, such as global positioning system (GPS) satellites. In various embodiments, display 750 can include displays such as liquid crystal displays (LCD), and touch screen displays. In various embodiments, system 700 can be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, a notebook, a smartphone, etc. In various embodiments, system can have more or less elements and / or different architectures. Where appropriate, methods described herein can be implemented as computer programs that are executable by the computer. Computer programs can be stored on storage media such as non-transitory storage media.

[0215] Embodiments of the present disclosure are 3GPP specifications that can employ a combination of techniques / processes to create an end product.

[0216] Those of skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0217] It should be appreciated that the systems, apparatuses and methods disclosed in embodiments of the present application can be implemented in other ways. The above-described embodiments are merely exemplary. The division of units is merely based on logical functions, and there are other divisions. It is possible that multiple units or elements are combined or integrated in another system. Some features can also be omitted or skipped. On the other hand, the mutual coupling, direct coupling or communication coupling shown or discussed operates through some ports, devices or units, whether indirectly or communicatively, in the form of electricity, mechanics or other kinds.

[0218] The units used for illustration are or are not physically separated. The units used for display are or are not physical units, i.e. located in one place or distributed on multiple network units. Some or all of the units are used according to the purpose of the embodiments. In addition, each functional unit in each embodiment can be integrated in one processing unit, physically independent, or integrated with two or more units in one processing unit.

[0219] If the software functional unit is implemented and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical solutions proposed by the present application can be substantially or partially implemented in the form of a software product. Alternatively, part of the technical solutions beneficial to the prior art can be implemented in the form of a software product. The software product in the computer is stored in a storage medium, which includes a plurality of commands for a computing device (such as a personal computer, a server or a network device) to execute all or some steps disclosed in the embodiments of the present application. The storage medium includes a flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk or other kinds of media capable of storing program codes.

[0220] Although the present application has been described in connection with the embodiments considered to be the most practical and preferred, it is to be understood that the present application is not limited to the disclosed embodiments, but is intended to cover various arrangements made without departing from the spirit and scope of the broadest interpretation of the appended claims.

Claims

1. A method of channel state information (CSI) performed in a user equipment (UE), characterized in that, The method comprises: determining which M subbands are selected among all subbands according to a channel quality indicator (CQI) reporting mode, wherein each subband comprises at least one physical resource block (PRB), and the M is one-to-one related to a subband size; determining a value of the M, wherein in a subband size configuration, each level bandwidth part (BWP) range corresponds to two subband sizes, and a mapping table of the subband size and the BWP adds a dimension, i.e. the value of the M; reporting at least one CQI value based on the M subbands to a base station (BS); and reporting a position of the M subbands to the BS; wherein the position of the M subbands is represented by a bitmap, each field in the bitmap corresponds to a subband, and is used to indicate whether the subband is selected, and M bits in the bitmap are set to 1; the value of the M is determined by a mapping relationship between a size of the BWP and the subband size, and a mapping table of the mapping relationship adds a dimension for indicating the value of the M corresponding to the subband size; each BWP corresponds to one or more subband sizes, and further corresponds to one or more values of the M; the value of the M is further configured by a high-level parameter subbandSize and a ReportSubbandNum, wherein the subbandSize is used to configure a size of the selected subband, and the ReportSubbandNum is an auxiliary parameter for indicating the value of the M, and is used to indicate a selected value of the M among the one or more values of the M.

2. The method of claim 1, wherein, Each of the M subbands has a CQI value, and the determining which M subbands are selected among all subbands comprises: sorting the CQI values of all subbands; and selecting the M subbands with the worst M CQI values.

3. The method of claim 1, wherein, The M subbands in the subbands are randomly selected.

4. The method of claim 1, wherein, The M is configured by downlink control information (DCI), a high-level parameter, or a radio resource control (RRC) parameter.

5. The method of claim 1, wherein, The reporting at least one CQI value based on the M subbands to the base station (BS) comprises: reporting the CQI values of the M subbands to the BS.

6. The method of claim 1, wherein, The reporting at least one CQI value based on the M subbands to the base station (BS) comprises: reporting a statistical CQI value to the BS.

7. The method of claim 6, wherein, The CQI statistical value comprises an average of the CQI values of the M subbands and a CQI variance of the M subbands.

8. The method of claim 7, wherein, reporting one of a maximum or a minimum of the CQI values of the M subbands together with the CQI statistical value.

9. The method of claim 1, wherein, reporting only at least one CQI value to the BS based on a setting of a high-level parameter reportQuantity.

10. The method of claim 1, wherein, reporting a signal to interference plus noise ratio (SINR) together with at least one CQI value to the BS based on a setting of a high-level parameter reportQuantity.

11. The method of claim 1, wherein, A subband offset level of each of the M subbands is defined as: subband offset level = subband CQI index - reference CQI index; obtaining a subband differential CQI value of each of the M subbands according to the subband offset level of each of the M subbands; wherein the reporting at least one CQI value based on the M subbands to the base station (BS) comprises: reporting to the BS the subband differential CQI value of each of the M subbands.

12. The method of claim 11, wherein, The reference CQI index is an average of the CQI values of all subbands.

13. The method of claim 11, wherein, The reference CQI index is one of the subbands with the best CQI value.

14. The method of claim 11, wherein, The reference CQI index is one of the subbands with the worst CQI value.

15. The method of claim 11, wherein, At least one reporting strategy for the reporting to the base station BS at least one CQI value based on M subbands is determined based on the size of the bandwidth part BWP.

16. The method of claim 11, wherein, At least one reporting strategy for the reporting to the base station BS at least one CQI value based on M subbands is determined based on the number of the subbands.

17. The method of claim 1, wherein, The priority of the CSI reported to the BS is associated with an ultra-reliable low latency communication URLLC service.

18. The method of claim 1, wherein, The priority of the CSI reported to the BS is associated with an enhanced mobile broadband eMBB service.

19. The method of claim 1, wherein, The priority of the CSI reported to the BS is associated with a physical uplink control channel PUCCH-borne aperiodic CSI A-CSI report.

20. The method of claim 1, wherein, The priority of the CSI reported to the BS is associated with a physical uplink shared channel PUSCH-borne aperiodic CSI A-CSI report.

21. The method of claim 1, wherein, The priority of the CSI reported to the BS is associated with one of an ultra-reliable low latency communication URLLC service and an enhanced mobile broadband eMBB service and one of a physical uplink control channel PUCCH-borne aperiodic CSI A-CSI report, a physical uplink shared channel PUSCH-borne aperiodic CSI A-CSI report, a physical uplink control channel PUCCH-borne semi-persistent CSI report, a physical uplink shared channel PUSCH-borne semi-persistent CSI report, and a physical uplink control channel PUCCH-borne periodic CSI report.

22. A method of channel state information (CSI) performed in a base station (BS), the method comprising: Comprising: receiving from a user equipment UE at least one channel quality indication CQI value, wherein the at least one CQI value is based on M subbands out of all subbands, each subband comprising at least one physical resource block PRB, and the M is one-to-one related to a subband size; receiving from the UE a location of the M subbands; and and selecting for the UE a modulation coding scheme MCS according to the at least one CQI value and the location of the M subbands, wherein in a subband size configuration, each level of bandwidth part BWP range corresponds to two subband sizes, and a mapping table of the subband size and the BWP increases a dimension, i.e. the value of the M; The positions of the M subbands are represented by a bitmap, each field of the bitmap corresponding to a subband and being used to indicate whether the subband is selected, and M bits in the bitmap are set to 1; the value of M is determined by a mapping relationship between a size of the BWP and a subband size, and a mapping table of the mapping relationship is increased by one dimension to represent the value of M corresponding to the subband size; each BWP corresponds to one or more subband sizes, and further corresponds to one or more values of M; the value of M is further configured by a higher-layer parameter subbandSize and a ReportSubbandNum, wherein the subbandSize is used to configure a size of a selected subband, and the ReportSubbandNum is an auxiliary parameter for indicating the value of M and is used to indicate a selected value of M from the one or more values of M.

23. The method of claim 22, wherein, The M is configured by downlink control information DCI, a higher-layer parameter, or a radio resource control RRC parameter.

24. The method of claim 22, wherein, Based on a setting of a higher-layer parameter reportQuantity, only the at least one CQI value is received.

25. The method of claim 22, wherein, Based on a setting of a higher-layer parameter reportQuantity, a signal-to-interference-plus-noise ratio SINR and the at least one CQI value are received.

26. A user equipment (UE), comprising: Comprise: a transceiver; and a processor connected with the transceiver and configured to perform the following steps, comprising: determining which M subbands are selected from all subbands according to a channel quality indication CQI reporting mode, wherein each subband includes at least one physical resource block PRB, and the M is one-to-one related to a subband size; determining a value of M, wherein in a subband size configuration, each level of a bandwidth part BWP range corresponds to two subband sizes, and a mapping table of the subband size and the BWP is increased by one dimension, i.e., the value of M; reporting, to a base station BS, at least one CQI value based on the M subbands; and reporting, to the BS, positions of the M subbands; wherein the positions of the M subbands are represented by a bitmap, each field of the bitmap corresponding to a subband and being used to indicate whether the subband is selected, and M bits in the bitmap are set to 1; the value of M is determined by a mapping relationship between a size of the BWP and a subband size, and a mapping table of the mapping relationship is increased by one dimension to represent the value of M corresponding to the subband size; each BWP corresponds to one or more subband sizes, and further corresponds to one or more values of M; the value of M is further configured by a higher-layer parameter subbandSize and a ReportSubbandNum, wherein the subbandSize is used to configure a size of a selected subband, and the ReportSubbandNum is an auxiliary parameter for indicating the value of M and is used to indicate a selected value of M from the one or more values of M.

27. The user equipment of claim 26, wherein, Each of the M subbands has a CQI value, and the determining which M subbands are selected from all subbands comprises: sorting the CQI values of all subbands; and selecting the M subbands with the worst M CQI values.

28. The user equipment of claim 26, wherein, The M subbands in the subbands are randomly selected.

29. The user equipment of claim 26, wherein, M is configured by downlink control information DCI, a high layer parameter, or a radio resource control RRC parameter.

30. The user equipment of claim 26, wherein, The reporting of the at least one CQI value based on the M subbands to the base station BS includes: reporting the CQI values of the M subbands to the BS.

31. The user equipment of claim 26, wherein, The reporting of the at least one CQI value based on the M subbands to the base station BS includes: reporting a statistical CQI value to the BS.

32. The user equipment of claim 31, wherein, The CQI statistical value includes an average of the CQI values of the M subbands and a CQI variance of the M subbands.

33. The user equipment of claim 32, wherein, reporting a maximum of the CQI values of the M subbands together with the CQI statistical value.

34. The user equipment of claim 32, wherein, reporting a minimum of the CQI values of the M subbands together with the CQI statistical value.

35. The user equipment of claim 26, wherein, reporting only at least one CQI value to the BS based on a setting of a high layer parameter reportQuantity.

36. The user equipment of claim 26, wherein, reporting a signal to interference plus noise ratio SINR together with at least one CQI value to the BS based on a setting of a high layer parameter reportQuantity.

37. The user equipment of claim 26, wherein, A subband offset level of each of the M subbands is defined as: subband offset level = subband CQI index - reference CQI index; obtaining a subband differential CQI value of each of the M subbands according to the subband offset level of each of the M subbands; The reporting of the at least one CQI value based on the M subbands to the base station BS includes: reporting the subband differential CQI value of each of the M subbands to the BS.

38. The user equipment of claim 37, wherein, The reference CQI index is an average of the CQI values of all subbands.

39. The user equipment of claim 37, wherein, The reference CQI index is one of the subbands with the best CQI value.

40. The user equipment of claim 37, wherein, The reference CQI index is one of the subbands with the worst CQI value.

41. The user equipment of claim 37, wherein, At least one reporting strategy for the reporting of the at least one CQI value based on the M subbands to the base station BS is determined based on a size of a bandwidth part BWP.

42. The user equipment of claim 37, wherein, At least one reporting strategy for the reporting of the at least one CQI value based on the M subbands to the base station BS is determined based on a number of the subbands.

43. The user equipment of claim 26, wherein, A priority of the CSI reported to the BS is associated with an ultra-reliable low latency communication URLLC service.

44. The user equipment of claim 26, wherein, A priority of the CSI reported to the BS is associated with an enhanced mobile broadband eMBB service.

45. The user equipment of claim 26, wherein, A priority of the CSI reported to the BS is associated with a physical uplink control channel PUCCH-borne aperiodic CSI A-CSI report.

46. The user equipment of claim 26, wherein, A priority of the CSI reported to the BS is associated with a physical uplink shared channel PUSCH-borne aperiodic CSI A-CSI report.

47. The user equipment of claim 26, wherein, A priority of the CSI reported to the BS is associated with one of an ultra-reliable low latency communication, URLLC, service and an enhanced mobile broadband, eMBB, service and is associated with one of a physical uplink control channel, PUCCH, carried aperiodic, A-CSI, reporting, a physical uplink shared channel, PUSCH, carried A-CSI reporting, a PUCCH carried semi-persistent, SP, CSI reporting, a PUSCH carried SP CSI reporting, and a PUCCH carried periodic, P-CSI, reporting.

48. A base station, comprising: Comprising: a transceiver; and a processor connected with the transceiver and configured to perform the following steps, comprising: receiving at least one channel quality indication, CQI, value from a user equipment, UE, wherein the at least one CQI value is based on M subbands out of all subbands, each subband comprising at least one physical resource block, PRB, and the M is one-to-one associated with a subband size; receiving a location of the M subbands from the UE; and selecting a modulation coding scheme, MCS, for the UE according to the at least one CQI value and the location of the M subbands, wherein in a subband size configuration, each level bandwidth part, BWP, range corresponds to two subband sizes, and a mapping table of the subband size and the BWP adds one dimension, i.e., a value of the M; wherein the location of the M subbands is represented by a bitmap, each field in the bitmap corresponding to a subband, for indicating whether the subband is selected, and there are M bits set to 1 in the bitmap; the value of the M is determined by a mapping relationship between a size of the BWP and the subband size, and a mapping table of the mapping relationship adds one dimension for representing the value of the M corresponding to the subband size; each BWP corresponds to one or more subband sizes, and further corresponds to one or more values of the M; the value of the M is further configured by a higher layer parameter subbandSize and a ReportSubbandNum, wherein the subbandSize is used to configure a size of the selected subband, and the ReportSubbandNum is an auxiliary parameter for indicating the value of the M, for indicating a selected value of the M in the one or more values of the M.

49. The base station of claim 48, characterized in that, The M is configured by a downlink control information, DCI, a higher layer parameter, or a radio resource control, RRC, parameter.

50. The base station of claim 48, wherein, The at least one CQI value is received based on a setting of a higher layer parameter reportQuantity.

51. The base station of claim 48, wherein A signal to interference plus noise ratio, SINR, and the at least one CQI value are received based on a setting of a higher layer parameter reportQuantity.

52. A chip, comprising: Comprising: a processor configured to invoke and run a computer program stored in a memory to cause a device installed with the chip to perform the method of any one of claims 1 to 21.

53. A chip, comprising: Comprising: a processor configured to invoke and run a computer program stored in a memory to cause a device installed with the chip to perform the method of any one of claims 22 to 25.

54. A computer-readable storage medium, comprising: A computer program is stored, wherein the computer program causes a computer to perform the method of any one of claims 1 to 21.

55. A computer-readable storage medium, comprising: A computer program is stored, wherein the computer program causes a computer to perform the method of any one of claims 22 to 25.

56. A computer program product, characterised in that, A computer program is included, wherein the computer program causes a computer to perform the method of any one of claims 1 to 21.

57. A computer program product, characterised in that, A computer program is included, wherein the computer program causes a computer to perform the method of any one of claims 22 to 25.

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