CSI reporting enhancements for type II codebooks

Abstract

A user equipment (UE) is configured to receive channel state information (CSI) configuration information for reporting type II codebook-based channel state information (CSI) feedback, receive CSI measurement resources, and transmit the type II codebook-based CSI feedback to a base station. Further, a base station is configured to transmit channel state information (CSI) configuration information to a user equipment (UE) for the UE to report CSI feedback based on a type II codebook, and to receive the CSI feedback of the type II codebook from the UE.

Description

Technical Field

[0001] The present disclosure relates generally to communications, and in particular to CSI reporting enhancements for Type II codebooks. Background Art

[0002] A user equipment (UE) may be connected to a fifth generation (5G) new radio (NR) network. In certain types of deployment scenarios, it has been recognized that conventional channel state information (CSI) mechanisms may cause UEs with medium or high mobility to suffer significant performance losses. There is a need for CSI reporting enhancements that are configured to improve the performance of UEs with medium or high mobility. Summary of the invention

[0003] Some exemplary embodiments relate to a processor of a user equipment (UE) configured to perform operations including: receiving CSI configuration information for reporting channel state information (CSI) feedback based on a type II codebook; receiving CSI measurement resources; and sending type II codebook CSI feedback to a base station.

[0004] Other exemplary embodiments relate to a user equipment (UE) having: a transceiver configured to communicate with a base station; and a processor communicatively coupled to the transceiver and configured to perform operations. The operations include: receiving CSI configuration information for reporting channel state information (CSI) feedback based on a type II codebook; receiving CSI measurement resources; and sending type II codebook CSI feedback to the base station.

[0005] Another exemplary embodiment relates to a processor of a base station, the processor being configured to perform operations including: sending channel state information (CSI) configuration information to a user equipment (UE) for the UE to report CSI feedback based on a type II codebook; and receiving type II codebook CSI feedback from the UE.

[0006] Additional exemplary embodiments relate to a base station having: a transceiver configured to communicate with a user equipment (UE); and a processor communicatively coupled to the transceiver and configured to perform operations. The operations include: sending channel state information (CSI) configuration information to the UE for the UE to report CSI feedback based on a type II codebook; and receiving type II codebook CSI feedback from the UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Exemplary network arrangements are shown according to various exemplary embodiments.

[0008] Figure 2An exemplary user equipment (UE) is shown according to various exemplary embodiments.

[0009] Figure 3 An exemplary base station according to various exemplary embodiments is shown.

[0010] Figure 4 A signaling diagram for reporting channel state information (CSI) feedback according to various exemplary embodiments is shown.

[0011] Figure 5 A timeline illustrating an example of precoding matrix indicator (PMI) reporting components with different reporting periodicities according to various exemplary embodiments is shown.

[0012] Figure 6 A timeline illustrating an example of reporting a channel quality indicator (CQI) with a different periodicity than a PMI according to various exemplary embodiments is shown.

[0013] Figure 7 A timeline illustrating an example of reporting wideband CQI and subband CQI with different reporting periodicities according to various exemplary embodiments is shown.

[0014] Figure 8 A timeline illustrating an example of reporting a rank indicator (RI) / layer indicator (LI) with a different reporting periodicity compared to other CSI reporting quantities according to various exemplary embodiments is shown. DETAILED DESCRIPTION

[0015] The exemplary embodiments may be further understood with reference to the following description and associated drawings, wherein similar elements have the same reference numerals.The exemplary embodiments introduce channel state information (CSI) reporting enhancements.

[0016] The exemplary embodiments are described with reference to a user equipment (UE). However, reference to a UE is provided for illustrative purposes only. The exemplary embodiments may be used with any electronic component that can establish a connection with a network and is configured with hardware, software, and / or firmware for exchanging information and data with the network. Therefore, the UE described herein is used to represent any electronic component.

[0017] The exemplary embodiments are also described with reference to a fifth generation (5G) new radio (NR) network configured with CSI feedback based on a type II codebook. However, reference to a 5G NR network is provided for illustrative purposes only. The exemplary embodiments may be used with any suitable type of network and / or codebook.

[0018] In 5G NR, the Type II Multiple Input Multiple Output (MIMO) codebook can be based on W1*W2*WF , where W1 represents the spatial basis selection, W f represents the frequency base selection, and W2 represents the combining coefficient. The type II codebook can utilize the channel space domain property W1 and the frequency domain property W f The CSI reporting enhancement for type II codebook introduced in this paper is configured to exploit the time domain properties of the channel without modifying the spatial domain basis and the frequency domain basis.

[0019] In one aspect, the exemplary embodiment introduces enhancements to precoding matrix indicator (PMI) reporting. Those skilled in the art will appreciate that a CSI report may include a PMI configured to indicate a UE preferred precoder. The network may then consider the reported PMI when selecting a precoder for subsequent downlink transmissions.

[0020] In another aspect, the exemplary embodiment introduces enhancements to channel quality indicator (CQI) reporting. Those skilled in the art will appreciate that a CSI report may include a CQI indicating a UE estimated signal to interference plus noise ratio (SINR) and / or a preferred modulation and coding scheme (MCS). The network may then consider the reported CQI to ensure that subsequent downlink transmissions are adequately configured for given channel conditions.

[0021] In yet another aspect, the exemplary embodiment introduces enhancements to rank indicator (RI) and layer indicator (LI) reporting. Those skilled in the art will appreciate that the CSI report may include an RI configured to indicate a UE preferred rank (e.g., the number of transmission layers). The CSI report may also include an LI configured to indicate the strongest layer index from the set of layers indicated by the RI. The network may then take the reported RI and LI into account when configuring the downlink transmission layer.

[0022] Each of the exemplary enhancements introduced herein is described in detail below. While the exemplary embodiments may provide performance benefits to UEs with medium or high mobility, the exemplary embodiments are not limited to this type of deployment scenario and may be utilized by any appropriate UE. The exemplary enhancements introduced herein may be used independently of each other, in conjunction with currently implemented CSI reporting mechanisms, in conjunction with future implementations of CSI reporting mechanisms, or independently of other CSI reporting mechanisms.

[0023] Figure 1An exemplary network arrangement 100 according to various exemplary embodiments is shown. The exemplary network arrangement 100 includes a UE 110. Those skilled in the art will appreciate that the UE 110 may be any type of electronic component configured to communicate via a network, such as a mobile phone, a tablet computer, a desktop computer, a smart phone, a phablet, an embedded device, a wearable device, an Internet of Things (IoT) device, etc. It should also be appreciated that an actual network arrangement may include any number of UEs used by any number of users. Therefore, for illustrative purposes, only an example with a single UE 110 is provided.

[0024] UE 110 may be configured to communicate with one or more networks. In the example of network configuration 100, the network with which UE 110 may wirelessly communicate is a 5G NR radio access network (RAN) 120. However, UE 110 may also communicate with other types of networks (e.g., 5G cloud RAN, next generation RAN (NG-RAN), long term evolution (LTE) RAN, traditional cellular networks, wireless local area networks (WLAN), etc.), and UE 110 may also communicate with the network via a wired connection. Referring to the exemplary embodiment, UE 110 may establish a connection with 5G NR RAN 120. Therefore, UE 110 may have a 5G NR chipset to communicate with NR RAN 120.

[0025] The 5G NR RAN 120 may be part of a cellular network that may be deployed by a network operator, such as Verizon, AT&T, T-Mobile, etc. The 5G NR RAN 120 may include, for example, cells or base stations (Node B, eNodeB, HeNB, eNBS, gNB, gNodeB, macrocell base stations, microcell base stations, small cell base stations, femtocell base stations, etc.) configured to transmit and receive communication traffic from UEs equipped with appropriate cellular chipsets.

[0026] Those skilled in the art will appreciate that any relevant process may be performed for the UE 110 to connect to the 5G NR RAN 120. For example, as discussed above, the 5G NR RAN 120 may be associated with a particular cellular provider at which the UE 110 and / or its user has a protocol and credential information (e.g., stored on a SIM card). Upon detecting the presence of the 5G NR RAN 120, the UE 110 may send corresponding credential information in order to associate with the 5G NR RAN 120. More specifically, the UE 110 may be associated with a particular base station (e.g., gNB 120A).

[0027] The network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP multimedia subsystem (IMS) 150, and a network service backbone 160. The cellular core network 130 may refer to an interconnected set of components that manage the operation and traffic of a cellular network. It may include an evolved packet core (EPC) and / or a 5G core (5GC). The cellular core network 130 also manages the traffic flowing between the cellular network and the Internet 140. The IMS 150 may generally be described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide multimedia services to the UE 110. The network service backbone 160 communicates directly or indirectly with the Internet 140 and the cellular core network 130. The network service backbone 160 may generally be described as a set of components (e.g., servers, network storage arrangements, etc.) that implement a set of services that can be used to extend the functionality of the UE 110 to communicate with various networks.

[0028] Figure 2 An exemplary UE 110 is shown according to various exemplary embodiments. Figure 1 100 is used to describe the UE 110 with respect to the network arrangement 100 of FIG. UE 110 may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. Other components 230 may include, for example, an audio input device, an audio output device, a power source, a data acquisition device, a port for electrically connecting UE 110 to other electronic devices, and the like.

[0029] Processor 205 may be configured to execute multiple engines of UE 110. For example, these engines may include CSI reporting engine 235. CSI reporting engine 235 may perform various operations related to reporting CSI, including but not limited to receiving CSI measurement resources, generating CSI reports, and sending CSI reports to the network.

[0030] The engine 235 described above is provided as an application (e.g., program) executed by the processor 205 for illustrative purposes only. The functions associated with the engine 235 may also be represented as independent combined components of the UE 110, or may be modular components coupled to the UE 110, for example, integrated circuits with or without firmware. For example, the integrated circuit may include an input circuit for receiving a signal and a processing circuit for processing signals and other information. The engine may also be embodied as an application or an independent application. In addition, in some UEs, the functions described for the processor 205 are split between two or more processors such as a baseband processor and an application processor. The exemplary embodiments may be implemented in any of these or other configurations of the UE.

[0031] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to display data to a user, and the I / O device 220 may be a hardware component that enables a user to perform input. The display device 215 and the I / O device 220 may be separate components or may be integrated together (such as a touch screen). The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, LTE-RAN (not shown in the figure), traditional RAN (not shown in the figure), WLAN (not shown in the figure), etc. Therefore, the transceiver 225 can operate on a variety of different frequencies or channels (e.g., a set of continuous frequencies).

[0032] Figure 3 An exemplary base station 300 is shown in accordance with various exemplary embodiments. Base station 300 may represent a gNB 120A or any other access node that a UE 110 may use to establish a connection and manage network operations.

[0033] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, and other components 325. These other components 325 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports for electrically connecting the base station 300 to other electronic devices and / or a power source, and the like.

[0034] The processor 305 may be configured to execute multiple engines of the base station 300. For example, the engines may include a CSI reporting engine 330. The CSI reporting engine 330 may perform various operations related to CSI reporting, including but not limited to sending CSI configuration information, sending CSI measurement resources, and receiving CSI reports.

[0035] The engine 330 described above as an application (e.g., a program) executed by the processor 305 is merely exemplary. The functions associated with the engine 330 may also be represented as a separate combined component of the base station 300, or may be a modular component coupled to the base station 300, such as an integrated circuit with or without firmware. For example, an integrated circuit may include input circuits for receiving signals and processing circuits for processing signals and other information. In addition, in some base stations, the functions described for the processor 305 are split between multiple processors (e.g., baseband processors, application processors, etc.). The exemplary embodiments may be implemented in any of these or other configurations of the base station.

[0036] The memory 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or port that enables a user to interact with the base station 300. The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., a set of continuous frequencies). Thus, the transceiver 320 may include one or more components (e.g., radio components) to enable data exchange with various networks and UEs.

[0037] Figure 4 A signaling diagram 400 for reporting CSI feedback according to various exemplary embodiments is shown. Figure 1 Network layout 100, Figure 2 UE 110 and Figure 3 A signaling diagram 400 is described for the base station 300 .

[0038] Signaling diagram 400 is described with reference to a scenario where UE 110 reports CSI feedback to gNB 120A. Initially, a general overview of this example scenario is described below to provide context for the example CSI reporting techniques introduced herein. Example implementations include enhancements for PMI reporting, CQI reporting, and RI / LI reporting. Each of these example enhancements is described in detail below following the description of signaling diagram 400.

[0039] In 405, UE 110 receives CSI configuration information from gNB 120A. The configuration information may include, but is not limited to, configuration information for CSI measurement resources, the type of CSI to be reported, and CSI reporting parameters such as periodicity and slot offset.

[0040] The CSI configuration information may be provided in one or more radio resource control (RRC) messages to UE 110. For example, the RRC message may include information elements (IEs) such as, but not limited to, CSI-ResourceConfig, CSI-ReportConfig, reportQuantity, and codebookConfig. However, example embodiments are not limited to RRC messages, and the CSI configuration information may be provided in any suitable type of message (e.g., a medium access control (MAC) control element (CE), downlink control information (DCI), etc.).

[0041] The CSI configuration information may include configuration information for CSI measurement resources. CSI measurement resources may be provided using a synchronization signal block (SSB), a CSI reference signal (RS), or any other appropriate type of signal. CSI measurement resources may include channel measurement resources (CMRs) and interference measurement resources (IMRs). CMRs may include one or more non-zero power (NZP) CSI reference signals (RSs) and / or zero power (ZP) interference measurement resources (IMRs). The periods and offsets of these CMR resources may be characterized in time slots or in any other appropriate manner. Throughout this specification, any reference to a particular type of CMR is provided for illustrative purposes only, and the exemplary embodiments may be applicable to any appropriate type of CMR.

[0042] The IMR may include one or more zero power (ZP) interference measurement resources (IMRs), NZP-CSI-RS, or a combination thereof. Throughout this specification, the terms "ZP IMR" and "CSI-IM" may be used interchangeably to identify the same type of CSI resources, and "IMR" may refer to a "ZP IMR", "NZP IMR", or a combination of "ZP IMR" and "NZP IMR". The periods and offsets of these IMRs may be characterized in time slots or in any other appropriate manner. Throughout this specification, any reference to a particular type of IMR is provided for illustrative purposes only, and the exemplary embodiments may apply to any appropriate type of IMR.

[0043] UE 110 may be configured with one or more CSI measurement resource sets. Each CSI measurement resource set may include one or more CMRs and / or one or more IMRs. The network may configure the CSI measurement resource sets using the CSI configuration information provided in 405 or any other appropriate message. In some embodiments, the network may selectively activate or deactivate the configured CSI measurement resource sets at UE 110 using a MAC CE, a DCI, or any other appropriate type of message.

[0044] In 410, UE 110 receives CSI measurement resources. In signaling diagram 400, the CSI measurement resources are sent by gNB 120A. However, in an actual deployment scenario, UE 110 may receive CSI measurement resources from multiple serving cells, including serving cells deployed by gNBs or base stations other than gNB 120A.

[0045] In 415, UE 110 sends a CSI report to gNB 120A. The content of the CSI report and the sending of the CSI report may be based on the CSI configuration information provided by gNB 120A in 405. For example, the network may configure CSI measurement resources for UE 110 using the CSI-ResourceConfig IE. The CSI report may include one or more different types of CSI (e.g., PMI, CQI, RI, LI, etc.) derived based on the CSI measurement resources. The network may specify the type of CSI to be reported using a reportQuantity IE configured to indicate one or more parameters to be reported. For periodic and (semi-persistent) SP type IICSI, there may be multiple reporting opportunities for CSI reporting at different times configured by the network using the CSIreportPeriodicityandOffset IE of the CSI-ReportConfig IE. However, the above examples are provided for illustrative purposes only and are not intended to limit the exemplary embodiments in any way. The exemplary embodiments introduced below may be used in conjunction with any suitable currently implemented CSI reporting mechanism or future implementation of a CSI reporting mechanism, or may be used independently of other CSI reporting mechanisms.

[0046] Alternatively, or in addition to the RRC message, the CSI configuration information may be provided in a MAC CE, a DCI, or any other appropriate type of signal. For example, the MAC CE and / or the DCI may be configured to activate and deactivate a CSI measurement resource set, indicate a CSI reporting periodicity and a time slot offset, indicate a codebook type, change the configuration of a CSI parameter previously configured by an RRC message, or provide any other type of configuration information related to reporting CSI.

[0047] In one aspect, the exemplary embodiments introduce enhancements to PMI reporting. PMI may be included in the CSI report to indicate the UE preferred precoder. However, gNB 120A need not utilize the UE preferred precoder and may select a different precoder for subsequent downlink transmissions. gNB 120A may use DCI or any other appropriate type of signal to inform UE 110 of the selected precoder. Figure 4 The signaling diagram 400 of FIG. 4 details the exemplary PMI reporting enhancements introduced herein.

[0048] Type II MIMO codebook can be based on W1*W2*W F Structure, where W1 represents the space basis, W f W1 represents the frequency basis, and W2 represents the compression combination coefficient. Those skilled in the art will understand that these matrices (W1, W2, W F) are defined in various 3GPP specifications and documents. In this specification, these matrices can be used in the manner defined in the 3GPP specifications and documents, and can be modified according to the exemplary embodiments described herein.

[0049] The CSI report may include one or more PMIs. Each PMI may be based on the type II codebook structure (W1*W2*W F ) to explicitly or implicitly indicate the preferred precoder of UE 110. For example, the PMI may include a spatial component corresponding to the spatial basis of the UE preferred precoder (e.g., W1), a frequency component corresponding to the frequency basis of the UE preferred precoder (e.g., W f ), and a combination coefficient component (e.g., W2) corresponding to the combination coefficient of the UE preferred precoder. Each component of the PMI may be associated with one or more parameters identified by a codebook index hard-coded in the 3GPP specification. The entries of the codebook index may be represented by (i x ),(i x,x ) or (i x,x,x ) (specific examples of these entries are shown below). Those skilled in the art will appreciate that various different types of codebook indices are mapped to a variety of different formulas and tables in the 3GPP specification. In this specification, these codebook indices can be used in the manner in which they are defined in the 3GPP specification and can be modified according to the exemplary embodiments described herein. However, the exemplary embodiments are not limited to using the parameters referenced above, and any suitable type of information can be used to indicate the preferred pre-decoder to the network.

[0050] Throughout this specification, the term "PMI reporting component" may generally refer to information provided in a CSI report that can be used to derive a UE preferred precoder. In some examples, reference is made to "spatial-based PMI reporting component", which refers to information provided in a CSI report that can be used to derive a spatial basis (e.g., W1) for deriving a UE preferred precoder; "frequency-based PMI reporting component", which refers to information provided in a CSI report that can be used to derive a frequency basis (e.g., W f );Or “combination coefficient PMI reporting component”, which refers to information provided in the CSI report that can be used to derive the UE preferred precoder combination coefficient (e.g., W2). Each of the PMI reporting components identified above may be associated with one or more parameters identified by a codebook index and / or any other suitable type of information that can be used to derive the UE preferred precoder.

[0051] In conventional cases, when UE 110 is triggered to provide a CSI report including a PMI, UE 110 provides all three PMI report components, e.g., W1, W2, WF However, a scenario may arise where a first CSI report sent at a first time and a second CSI report sent at a second time are based on the same CSI measurement resources and include the same values ​​for the corresponding PMI reporting components for the first CSI report and the second CSI report. This redundant information may be an inefficient use of UE and network resources, particularly in low to medium speed mobility scenarios.

[0052] According to some exemplary aspects, for type IICSI feedback, the network may configure UE 110 to provide a subset of PMI reporting components in a CSI report. As a general example, at a first time, UE 110 may be triggered to provide a first CSI report to gNB 120A based on a CSI measurement resource set. The first CSI report may include all three PMI reporting components (e.g., W1, W2, W F ). At a second time, UE 110 may be triggered to provide a second CSI report to UE 110 based on the same CSI measurement resource set. Compared to the first CSI report, the second CSI report may include only a single PMI reporting component (e.g., W1, W2, W F In this type of scenario, on the network side, a preferred UE precoder may be derived based on the PMI reporting component provided in the first CSI report. The network may then utilize the PMI reporting component from the second CSI report to update the UE preferred precoder derived based on the first CSI report. The examples provided above are provided for illustrative purposes only, and exemplary embodiments may enable UE 110 to provide a CSI report that includes any subset of the PMI reporting components.

[0053] For periodic type IICSI reporting and SP type IICSI reporting, each PMI reporting component in the PMI reporting component may be reported with different periodicity. In one method, a CSI report including all three PMI reporting components may be reported with a larger periodicity, and a CSI report including only one or two PMI reporting components may be reported with a smaller periodicity. For example, the spatial-based PMI reporting component W1 and the frequency-based PMI reporting component W2 may be reported with a smaller periodicity. f The combined coefficient PMI reporting component W2 may be more robust against channel time domain fading than the combined coefficient PMI reporting component W2. Therefore, in some examples, the combined coefficient W2 may be sent more frequently with a smaller periodicity than other PMI reporting components.

[0054] Figure 5510, UE 110 is configured with multiple reporting opportunities to send a periodic type IICSI report or an SP-CSI type IICSI report. In reporting opportunity 511, UE 110 sends a PMI report including all three PMI report components (W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, W16, W17, W18, W19, W20, W21, W22, W30, W40, W5 F ). In reporting opportunities 512-514, UE 110 sends a CSI report that includes only the combined coefficient PMI reporting component W2. In reporting opportunity 515, UE 110 again sends a CSI report that includes all three PMI reporting components (W1, W2, W F ). In reporting opportunities 516 and 517, UE 110 sends a CSI report that includes only the combined coefficient PMI reporting component W2. Thus, in example 510, all three PMI reporting components (W1, W2, W F ) is sent with a greater periodicity than a CSI report that includes only the combined coefficient PMI reporting component W2.

[0055] In example 520, it is assumed that UE 110 is configured with multiple reporting opportunities to send a periodic type IICSI report or an SP-CSI type IICSI report. In reporting opportunities 521 and 525, UE 110 sends a PMI report including all three PMI report components (W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, W16, W17, W18, W19, W20, W21, W22, W3 F ). In reporting opportunities 522, 524, and 526, UE 110 sends a CSI report that includes only the combined coefficient PMI reporting component W2. In reporting opportunities 523 and 527, UE 110 sends a CSI report that includes both PMI reporting components (W2, W F ) of the CSI report. Therefore, in example 520, all three PMI reporting components (W1, W1, W F ) is a CSI report that includes two PMI reporting components (W2, W F ) and a CSI report including only the combined coefficient PMI reporting component W2 are sent with a greater periodicity. In example 520, a CSI report including only the combined coefficient PMI reporting component W2 is sent with a minimum periodicity.

[0056] In example 530, it is assumed that UE 110 is configured with multiple reporting opportunities to send a periodic type IICSI report or an SP-CSI type IICSI report. In reporting opportunity 531, UE 110 sends a PMI report including two PMI report components (W1, W2). F). In reporting opportunities 532-534, UE 110 sends a CSI report including only the combined coefficient PMI reporting component W2. In reporting opportunity 535, UE 110 again sends a CSI report including both PMI reporting components (W1, W2). F ). In reporting opportunities 536 and 537, UE 110 sends a CSI report that includes only the combined coefficient PMI reporting component W2. Thus, in example 530, the two PMI reporting components (W1, W2) are included. F ) is sent with a greater periodicity than a CSI report that includes only the combined coefficient PMI reporting component W2.

[0057] In examples 510-530, the UE preferred predecoder may be updated based on a subsequent PMI reporting component. For example, in example 510, the UE preferred predecoder may be derived based on three PMI reporting components provided in the CSI report sent during 521. Then, the UE preferred predecoder may be updated based on the combined coefficient PMI reporting component W2 provided in the CSI report sent in 522-524. However, the UE preferred predecoder is not required to be changed during this process. For example, in example 510, the combined coefficient PMI reporting component W2 provided in the CSI report sent in 522-524 may be the same as the combined coefficient PMI reporting component W1 provided in the CSI report sent in 521. The examples described above are provided for illustrative purposes only and are not intended to limit the exemplary implementation in any way. The exemplary implementation may enable any periodic or SP type IICSI report to have multiple different sets of one or more PMI reporting components, each PMI reporting component being configured with different reporting periodicities and / or offsets.

[0058] In another approach, different PMI reporting components may be reported during different reporting opportunities based on factors other than configured periodicity. For example, assume a scenario in which UE 110 is configured with multiple reporting opportunities in the time domain to send periodic type IICSI reports or SP-CSI type IICSI reports. The CSI report may be configured with a maximum number of bits that may be allocated to the PMI reporting component and / or the CSI report as a whole. Initially, UE 110 generates a first CSI report that includes only the spatial-based PMI reporting component W1 so as not to exceed the configured maximum number of bits. The first CSI report is sent during the first CSI reporting opportunity. Alternatively, or in addition to CSI omission, subsequent CSI reporting opportunities may be used to report other PMI reporting components. Therefore, in this example, UE 110 generates a CSI report that includes only the frequency-based PMI reporting component W1. f110 generates a second CSI report including only the combined coefficient PMI report component W1 so as not to exceed the configured maximum number of bits. The second CSI report is sent during the second CSI reporting opportunity. Then, UE 110 generates a third CSI report including only the combined coefficient PMI report component W1 so as not to exceed the configured maximum number of bits. The third CSI report is sent during the third CSI reporting opportunity. The PMI report components from the first CSI report, the second CSI report, and the third CSI report can be used together to derive a UE-preferred precoder.

[0059] In the examples described above, the exemplary techniques are referenced as being specific to three different sets of PMI reporting components, e.g., a spatial-based PMI reporting component (W1), a frequency-based PMI reporting component (W2), and a frequency-based PMI reporting component (W3). f ) and a combined coefficient PMI reporting component (W2). Each of the spatial base PMI reporting component, the frequency base PMI reporting component, and the combined coefficient PMI reporting component can be based on multiple parameters associated with the codebook index value. The following list provides the parameters carried in CSI part 1 and belonging to the spatial base PMI reporting component (W1), the frequency base PMI reporting component (W2), and the combined coefficient PMI reporting component (W3). f ) and some specific non-limiting examples of PMI-related parameters of one or more of the combined coefficient PMI reporting components (W2): rotation factors for the spatial basis (i 1,1 ), space basis indicator (i 1,2 ), frequency base selection window M 初始 ,i 1,5 , the frequency base indicator for layer l (i 1,6,l ), the rotation factor for the spatial basis (i 1,1 ), non-zero coefficient (NZC) position bitmap for layer 1 (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the differential amplitude of the NZC position for layer l (i 2,4,,l ), the phase of NZC for layer l (i 2,5,,l ), port selection (i 1,2 ), frequency base selection (u 1,6 ), NZC position bitmap for layer l (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the reference amplitude of NZC for layer l (i 2,4,l ) and the phase of NZC for layer l (i 2,5,l ).

[0060] The exemplary enhancements described herein may also be applicable to various PMI-related parameters included in a CSI report. That is, a CSI report may include a subset of parameters associated with a spatial-based PMI reporting component (W1), or a subset of parameters associated with a frequency-based PMI reporting component (W2). f ), or a subset of parameters associated with the combined coefficient PMI reporting component (W2). As an example, during a first CSI reporting opportunity, the first CSI report may include all PMI-related parameters associated with the spatial-based PMI reporting component (W1). In a second CSI reporting opportunity, the second CSI report may include one or a subset of the PMI-related parameters associated with the spatial-based PMI reporting component (W1). A CSI report including all PMI-related parameters associated with the spatial-based PMI reporting component (W1) and a CSI report including one or a subset of the PMI-related parameters associated with the spatial-based PMI reporting component (W1) may each have a different periodicity. In addition, in order to meet the configured maximum number of bits related to the PMI and / or the CSI report as a whole, the first CSI report may include one or a subset of the PMI-related parameters associated with the spatial-based PMI reporting component (W1). In the second CSI reporting opportunity, the second CSI report may include a different second set of PMI-related parameters associated with the spatial-based PMI reporting component (W1). The examples provided above are not intended to limit the exemplary embodiments in any way. Rather, these examples are provided to illustrate how exemplary PMI reporting enhancements can be applied to various PMI-related parameters.

[0061] In some embodiments, the CSI report may include an indication configured to indicate to the gNB 120A that the values ​​of one or more PMI reporting components are the same as those provided in a previous CSI report. This indication may be used in the scenario described above, where a first CSI report sent at a first CSI reporting opportunity does not contain the same PMI reporting parameters as a second CSI report sent at a second CSI reporting opportunity. For example, Figure 5 In example 510, the CSI report sent during CSI reporting opportunity 522 may contain an indication that the spatial-based PMI reporting component and the frequency-based PMI reporting component are the same as the previous CSI report sent during CSI reporting opportunity 521. In another example, when multiple consecutive CSI reports include different PMI reporting components (W1, W2, W3) corresponding to the same UE-preferred precoder, f ), this indication can be used to limit the number of bits used for the PMI for each CSI report and / or the number of bits used for the CSI report as a whole.

[0062] In an exemplary embodiment where the CSI report includes an indication configured to indicate to gNB 120A that the value of one or more PMI reporting components is the same as the value provided in the previous CSI report, UE 110 may receive a configuration indicating how the base station (e.g., gNB 120A) is to interpret this indication. UE 110 may receive this configuration via an RRC message.

[0063] The CSI report may contain a field specific to this indication and / or this indication may be provided in an existing field using a reserved value or any other suitable type of mechanism. One or more indications may be provided in the CSI report, each of which applies to one or more PMI reporting components. In some examples, the indication may be specific to the spatial-based PMI reporting component (W1), the frequency-based PMI reporting component (W2), the frequency-based PMI reporting component (W3), the frequency-based PMI reporting component (W4), the frequency-based PMI reporting component (W5), the frequency-based PMI reporting component (W6), the frequency-based PMI reporting component (W7), the frequency-based PMI reporting component (W8), the frequency-based PMI reporting component (W9), the frequency-based PMI reporting component (W11), the frequency-based PMI reporting component (W12), the frequency-based PMI reporting component (W13), the frequency-based PMI reporting component (W14), the frequency-based PMI reporting component (W15), the frequency-based PMI reporting component ( f ) and / or combination coefficient component (W2).

[0064] In some examples, the indication may be specific to one or more parameters for a Rel-16 or Rel-17 Type II codebook. As a non-limiting example, the indication may apply to one or more of the following parameters provided in CSI Part 1: rotation factor (i 1,1 ), space basis indicator (i 1,2 ), frequency base selection window M 初始 ,i 1,5 , the frequency base indicator for layer l (i 1,6,l ), the rotation factor for the spatial basis (i 1,1 ), non-zero coefficient (NZC) position bitmap for layer 1 (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the differential amplitude of the NZC position for layer l (i 2,4,,l ), the phase of NZC for layer l (i 2,5,,l In some examples, the indication may be specific to one or more parameters for the Rel-17 Type II port selection codebook. As another non-limiting example, the indication may apply to one or more of the following parameters provided in CSI Part 1: Port Selection (i 1,2 ), frequency base selection (i 1,6 ), NZC position bitmap for layer l (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the differential amplitude of NZC for layer l (i 2,4,l ) and the phase of NZC for layer l (i 2,5,l ).

[0065] For CSI feedback based on type II codebook, time domain differential coding can be used for the following PMI-related parameters: reference amplitude for layer l (i 2,3,l ), the differential amplitude of the NZC position for layer l (i 2,4,,l ) and the phase of NZC for layer l (i 2,5,,l ). With time domain differential coding, UE 110 may report only the difference between the current measurement and the previous measurement. This may reduce the overhead associated with CSI feedback. In some implementations, UE 110 may report absolute values ​​periodically or based on a network trigger. This may mitigate error propagation issues.

[0066] In some embodiments, UE 110 may report PMI in a differential manner, as shown by the following equation:

[0067] W gNB (k+1)=W gNB (k)*W UE (k+1)

[0068] Here, W gNB (k) may represent the resulting precoder recommended by UE 110 to gNB 120A at time (k), and W UE (k) may represent the differential precoder reported by UE 110 to gNB 120A over the air at time (k). uE (k) May be limited to wideband or may also support sub-band CSI reporting.

[0069] Code W UE (k) may be performed similarly to the encoding of the combined coefficient PMI reporting component W2. uE Among the various entries of (k), a limited subset of NZCs may be reported. A bitmap may be used to report the location of the NZC. Differential encoding may be used to report the phase and amplitude of the NZC.

[0070] For high-speed UE mobility scenarios, when UE 110 performs time-domain filtering to form PMI, one or more of the following exemplary enhancements may be utilized to address the increased UE complexity and memory consumption associated with this type of scenario. In one embodiment, for PMI reporting, the CSI processing unit (CPU) counting rules may be enhanced, where the CPU may take longer to account for filtering operations. In other embodiments, the active CSI-RS counting rules may be enhanced, where the active CSI-RS may take longer to account for filtering operations. In other embodiments, a new type II codebook for high-speed scenarios may be introduced. For this codebook, UE 110 may report one or more supported triplet parameters, each triplet parameter representing the maximum number of ports for CSI-RS, the maximum number of CSI-RS resources, and the maximum total number of ports.

[0071] In the above examples, there may be multiple ways to determine the specific duration. In a first example, UE 110 may report the specific duration to a base station (e.g., gNB 120A). The report may be transmitted as part of uplink control information (UCI), MAC-CE signaling, or RRC signaling. In some exemplary embodiments, the duration is reported by UE 110 in RRC signaling as part of a UE capability report. In a second example, the base station may configure the specific duration. The configuration may be performed as part of RRC signaling. The configuration from the base station may be triggered by a request from UE 110. In a third example, the specific duration may be hard-coded in a specification (e.g., a 3GPP standard). When gNB 120A configures UE 110 for type IICSI reporting for high mobility, the extended duration is hard-coded and specified in 3GPP specification TS38.214.

[0072] In high-speed UE mobility scenarios, open-loop or semi-open-loop CSI reporting may be used for one or more of the following parameters related to PMI: rotation factor for spatial basis (i 1,1 ), space basis indicator (i 1,2 ), frequency base selection window M 初始 ,i 1,5 , the frequency base indicator for layer l (i 1,6,l ), the rotation factor for the spatial basis (i 1,1 ), non-zero coefficient (NZC) position bitmap for layer 1 (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the differential amplitude of the NZC position for layer l (i 2,4,,l ), the phase of NZC for layer l (i2,5,,l ), port selection (i 1,2 ), frequency base selection (i 1,6 ), NZC position bitmap for layer l (i 1,7,l ), the strongest NZC position for layer l (i 1,8,l ), the reference amplitude for layer l (i 2,3,l ), the reference amplitude of NZC for layer l (i 1,4,l ) and the phase of NZC for layer l (i 2,5,l ). Any suitable number of these parameters may be considered and / or randomly selected for open-loop or semi-open-loop CSI reporting.

[0073] To facilitate time domain CSI filtering at UE 110 in high speed UE mobility scenarios, the following exemplary implementation is introduced. In one example, UE 110 may recommend that gNB 120A always set timeRestrictionForChannelMeasurements IE to configured and timerestrictionForInterferenceMeasurements to configured. This recommendation may be provided in capability information, uplink control information (UCI), CSI reporting, or any other appropriate mechanism. In another example, in NZP-CSI-RS-ResourceSet, gNB 120A may set repetition to on when the reporting quantity relates to CQI, RI, CRI, PMI, or LI.

[0074] According to some aspects, the exemplary embodiments introduce techniques for utilizing the reportQuantity IE of CSI configuration information (e.g., 405 of method 400) (or similar mechanisms) to configure UE 110 to perform some of the exemplary CSI reporting enhancements described herein. In some examples, the CSI-ReportConfig IE may include a reportQuantity IE that indicates that UE 110 may report the spatial-based PMI reporting component (W1), the frequency-based PMI reporting component (W2), and the frequency-based PMI reporting component (W3). f) and / or combination coefficient component (W2). Therefore, the first reportQuantity IE of the first CSI-ReportConfig IE may indicate that the corresponding CSI report of the first reportQuantity IE may include one or more PMI reporting components of the three PMI reporting components, and the second reportQuantity IE of the second CSI-ReportConfig IE may indicate that the corresponding CSI report of the second reportQuantity IE may include different one or more PMI reporting components of the three PMI reporting components.

[0075] In other examples, the reportQuantity IE may be used to configure UE 110 to separately report specific parameters related to the PMI reporting component (e.g., rotation factors for the spatial basis (i 1,1 ), space basis indicator (i 1,2 ), the reference amplitude for layer l (i 2,3,l ), the differential amplitude of the NZC position for layer l (i 2,4,,l )). Therefore, the first reportQuantity IE of the first CSI-ReportConfigIE may indicate that the corresponding CSI report of the first reportQuantity IE may include one or more parameters related to PMI, and the second reportQuantity IE of the second CSI-ReportConfig IE may indicate that the corresponding CSI report of the second reportQuantity IE may include one or more different parameters related to PMI.

[0076] In another example, the reportQuantity IE may be used to configure the UE 110 to separately report specific parameters related to CSI reporting components (e.g., CQI, PMI, RI, LI, etc.). Thus, a first reportQuantity IE of a first CSI-ReportConfig IE may indicate that a corresponding CSI report of the first reportQuantity IE may include one or more parameters related to CSI reporting, and a second reportQuantity IE of a second CSI-ReportConfig IE may indicate that a corresponding CSI report of the second reportQuantity IE may include one or more different parameters related to CSI reporting.

[0077] For high-speed UE mobility scenarios, when UE 110 performs time-domain filtering to form PMI, the CPU counting rules may be enhanced such that different numbers of CPUs are counted for PMI reports based on the reportQuantity IE. For example, when the reportQuantity IE indicates that the PMI report will include (W1), (W2), (W f ), a first number of CPUs may be counted, and when the reportQuantity IE indicates that the PMI report will only include (W2), a different second number of CPUs may be counted. In this example, the first number of CSI-RS counted may be greater than the second number of CSI-RS counted.

[0078] In addition, for high-speed UE mobility scenarios, when UE 110 performs time-domain filtering to form PMI, the CSI-RS counting rules can be enhanced so that different numbers of active CSI-RS are counted for PMI reports based on the reportQuantity IE. For example, when the reportQuantity IE indicates that the PMI report will include (W1), (W2), (W f ), a first number of active CSI-RSs may be counted, and a different second number of CSI-RSs may be counted when the reportQuantity IE indicates that the PMI report will only include (W2). In this example, the first number of CSI-RSs counted may be greater than the second number of CSI-RSs counted.

[0079] According to some aspects, UE 110 may indicate a preferred CSI reporting setting to gNB 120A. For example, prior to the configuration information in 405, UE 110 sends a signal to gNB 120A indicating one or more preferred parameters related to CSI reporting. gNB 120A may, but need not, configure CSI reporting settings (e.g., CSI-ReportConfig) for UE 110 based on the preferred parameters indicated by UE 110.

[0080] In one approach, a CSI report may be configured to indicate a UE preferred CSI reporting setting. For example, in 450, CSI configuration information may configure UE 110 to provide a CSI report that includes an indication of one or more parameters that UE 110 determines may be beneficial for subsequent CSI reporting. These parameters may include, but are not limited to, reporting amounts for one or more different PMI reporting components and CSI reporting periodicity and / or time slots. The CSI report in 415 may include an indication of the UE preferred CSI reporting setting. Subsequently, gNB 120A may then provide additional CSI configuration information with CSI-ReportConfig including the CSI reporting setting based on the indication provided by UE 110 in CSI report 415.

[0081] In another method, when a predetermined condition is met, UE 110 may trigger the sending of an indication of a preferred CSI report setting. The predetermined condition may be based on a change in the Doppler of the channel exceeding a threshold or any other appropriate factor. In this method, an indication of a preferred CSI report setting may be provided on a physical random access channel (PRACH). The preferred parameters may include, but are not limited to, a report amount for one or more different PMI reporting components and a CSI report periodicity and / or time slot. For example, the indication may be a PRACH preamble sequence, a time domain position, or a frequency domain position. Different PRACH preamble sequences, time domain positions, and frequency domain positions may each be used to indicate different CSI report settings. In other embodiments, the sending of a preferred CSI report setting may be provided on PUSCH as an uplink MAC CE. If UE 110 does not have an uplink grant, UE 110 may be triggered to transmit a scheduling request before sending a MAC CE on PUSCH.

[0082] Alternatively, or in addition to UE 110 providing an indication of a UE preferred CSI reporting setting, UE 110 may also be triggered to send a sounding reference signal (SRS) to gNB 120A. gNB 120A may then derive measurement data corresponding to the channel based on the SRS and configure UE 110 CSI reporting settings (e.g., CSI-ReportConfig) based on the channel properties.

[0083] As described above, the exemplary embodiment also introduces enhancements to CQI reporting. Those skilled in the art will appreciate that a CSI report may include a CQI for indicating the SINR and / or preferred MCS estimated by the UE. The network may then consider the reported CQI to ensure that subsequent downlink transmissions are adequately configured for given channel conditions.

[0084] According to some aspects, the network may configure or trigger UE 110 to report only CQI in CSI reports among different reporting quantities. For example, a first measurement report sent during a first CSI reporting opportunity may include multiple reporting quantities (e.g., PMI, CQI, RI / LI) derived based on a first CSI measurement resource set. Then, UE 110 may send a second measurement report during a second CSI reporting opportunity that includes only CQI derived based on the same CSI measurement resource set from the reporting quantities of the first CSI report.

[0085] For periodic and SP type IICSI reporting, CQI may be reported with a different periodicity than other reporting quantities such as PMI. This may be configured using the CSI configuration information in 405. Figure 6 610, UE 110 is configured with multiple reporting opportunities to send a periodic type IICSI report or an SP-CSI type IICSI report. In reporting opportunity 611, UE 110 sends a report including all three PMI report components (W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, W16, W17, W18, W19, W20, W21, W22, W30, W40, W50, W61, W71, W8 f ) and CQI. In reporting opportunities 612-614, UE 110 sends a CSI report that includes only CQI. In reporting opportunity 615, UE 110 again sends a CSI report that includes all three PMI report components (W1, W2, W f ) and CQI. In reporting opportunities 616 and 617, UE 110 sends a CSI report that includes only CQI. Thus, in example 610, a CSI report that includes all three PMI report components (W1, W2, W3) is sent with greater periodicity than a CSI report that includes only CQI. f ) and CSI report of CQI.

[0086] Time domain differential coding may also be considered for CQI. For time K+1, UE 110 only reports CQIs that differ between time K and time K+1. UE 110 may be triggered to report absolute CQI periodically or in response to a trigger to mitigate error propagation.

[0087] When subband CQI is configured, the network may configure UE 110 to independently report the following: wideband CQI only, subband CQI only, and both wideband CQI and subband CQI. For example, a first CSI report sent at a first CSI reporting opportunity may include both wideband CQI and subband CQI. Subsequently, a second CSI report sent at a second CSI reporting opportunity may include only wideband CQI, and a third CSI report sent at a third CSI reporting opportunity may include only subband CQI. This example is not intended to limit the exemplary embodiments in any way, and is provided only to illustrate the types of CQI that may be reported in different CSI reports when subband CQI is configured.

[0088] For periodic and SP type IICSI reporting, different reporting periodicities and offsets may be used to report wideband CQI and subband CQI. This may be configured using the CSI configuration information in 405. Figure 7 A timeline illustrating an example of reporting wideband CQI and subband CQI with different reporting periodicities according to various exemplary embodiments is shown. In example 710, it is assumed that UE 110 is configured with multiple reporting opportunities to send a periodic type IICSI report or an SP-CSI type IICSI report and a scenario in which a subband CQI report is configured. In reporting opportunity 711, UE 110 sends a CSI report including both wideband CQI and subband CQI. In reporting opportunities 712-714, UE 110 sends a CSI report including only subband CQI. In reporting opportunity 715, UE 110 again sends a CSI report including both wideband CQI and subband CQI. In reporting opportunities 716 and 717, UE 110 sends a CSI report including only subband CQI. Therefore, in example 710, a CSI report including both wideband CQI and subband CQI is sent with a greater periodicity than a CSI report including only subband CQI. This arrangement of CSI reporting periodicity may be beneficial for scenarios where subband CQI is more sensitive to channel time-domain fading than wideband CQI.

[0089] As described above, the exemplary embodiment also introduces enhancements for RI and LI reporting. Those skilled in the art will appreciate that the CSI report may include an RI configured to indicate a UE preferred rank (e.g., the number of transmission layers). The CSI report may also include an LI configured to indicate the strongest layer index from the set of layers indicated by the RI. The network may then take the reported RI and LI into account when configuring the downlink transmission layer.

[0090] According to some aspects, the network may configure UE 110 to skip or omit RI reporting. When UE 110 skips RI reporting, UE 110 may assume that the RI is the same as the previous CSI report.

[0091] For periodic and SP type IICSI reporting, RI / LI may be reported with a different periodicity than other reporting quantities such as PMI and CQI. This may be configured using the CSI configuration information in 405. Figure 8 A timeline illustrating an example of reporting RI / LI with a different reporting periodicity compared to other CSI reporting quantities according to various exemplary embodiments is shown. In example 810, it is assumed that UE 110 is configured with multiple reporting opportunities to send a scenario of periodic type IICSI reports or SP-CSI type IICSI reports. In reporting opportunities 812, 814, and 816, UE 110 sends a CSI report including CQI. In reporting opportunities 813 and 817, UE 110 sends a CSI report including PMI and CQI. Therefore, in example 810, a CSI report including both CQI and PMI is sent more frequently than a CSI report including RI / LI. This arrangement of CSI reporting periodicity may be beneficial for scenarios where RI / LI is less sensitive to channel time domain fading than other reporting quantities.

[0092] Example

[0093] In a first embodiment, a processor of a user equipment (UE) is configured to perform operations including: receiving CSI configuration information for reporting channel state information (CSI) feedback based on a type II codebook; receiving CSI measurement resources; and sending a type II codebook CSI feedback to a base station.

[0094] In a second embodiment, the processor according to the first embodiment, wherein the UE is configured to use a differential reporting technique based on W gNB (k+1)=W gNB (k)*W UE (k+1) to report PMI, where W gNB (k) represents the resulting pre-decoder recommended by the UE to the base station at time (k), and W UE (k) represents the differential pre-decoder reported by the UE to the base station at time (k).

[0095] In a third embodiment, the processor according to the second embodiment, wherein the differential pre-decoder is limited to wideband.

[0096] In a fourth embodiment, the processor according to the second embodiment, wherein the differential pre-decoder supports both wideband and sub-band.

[0097] In a fifth embodiment, the processor according to the second embodiment, wherein the UE reports a subset of non-zero coefficients (NZC) among all entries of the differential precoder.

[0098] In a sixth embodiment, the processor according to the fifth embodiment, wherein the UE reports the subset of NZCs using a bitmap, and wherein the UE reports the phase and amplitude of the NZCs using differential coding.

[0099] In a seventh embodiment, according to the processor of the first embodiment, the operations further include sending a UE preferred CSI reporting setting to the base station in response to a predetermined condition related to UE mobility.

[0100] In an eighth embodiment, according to the processor of the seventh embodiment, the UE preferred CSI reporting setting is indicated by sending a physical random access channel (PRACH).

[0101] In a ninth embodiment, the processor according to the seventh embodiment, wherein the UE preferred CSI reporting setting is provided in an uplink medium access control (MAC) control element (CE).

[0102] In a tenth embodiment, the processor according to the first embodiment, wherein the UE is configured to send a CSI report with a reporting amount of only a channel quality indicator (CQI).

[0103] In an eleventh embodiment, the processor according to the first embodiment, wherein sending feedback based on the type II codebook also includes using a first periodicity to send CSI including each of a channel quality indicator (CQI) and a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component, and using a different second periodicity to send CSI including a CQI reporting component but without the PMI reporting component.

[0104] In a twelfth embodiment, the processor according to the first embodiment, wherein the type II codebook based CSI feedback uses time domain differential coding for a channel quality indicator (CQI).

[0105] In a thirteenth embodiment, the processor according to the twelfth embodiment, wherein the UE is configured to report an absolute value for the CQI periodically or in response to a trigger condition.

[0106] In a fourteenth embodiment, the processor according to the first embodiment, wherein the UE is configured to independently report each of the following at different times: i) wideband channel quality indicator (CQI), ii) subband CQI, and ii) both wideband CQI and subband CQI.

[0107] In a fifteenth embodiment, the processor according to the first embodiment, wherein the UE is configured to report a wideband channel quality indicator with a first periodicity and to report a subband CQI with a second, different periodicity.

[0108] In a sixteenth embodiment, the processor according to the first embodiment, wherein the UE is configured to omit rank indicator (RI) reporting when a current RI value is the same as a value of a previously reported RI.

[0109] In a seventeenth embodiment, the processor according to the first embodiment, wherein the UE is configured to report a rank indicator (RI) with a first periodicity and another CSI reporting quantity with a second, different periodicity.

[0110] In an eighteenth embodiment, a user equipment (UE) includes: a transceiver, the transceiver being configured to communicate with a base station; and a processor, the processor being communicatively coupled to the transceiver and configured to perform operations including: receiving CSI configuration information for reporting channel state information (CSI) feedback based on a type II codebook; receiving CSI measurement resources; and sending type II codebook CSI feedback to the base station.

[0111] In a nineteenth embodiment, a processor of a base station is configured to perform operations including: sending channel state information (CSI) configuration information to a user equipment (UE) for the UE to report CSI feedback based on a type II codebook; and receiving type II codebook CSI feedback from the UE.

[0112] In a twentieth embodiment, the processor according to the nineteenth embodiment, wherein the CSI feedback based on the type II codebook is used for a high-speed UE mobility scenario, and the base station receives from the UE a processing capability of the UE for the type II codebook for high-speed UE mobility, the processing capability comprising one or more parameter sets, each parameter comprising a maximum number of ports for a CSI reference signal (RS), a maximum number of CSI-RS resources, and a maximum total number of ports.

[0113] In a twenty-first embodiment, the processor according to the nineteenth embodiment, wherein the type II codebook based CSI feedback is configured for open-loop or semi-open-loop CSI reporting for one or more precoding matrix indicator (PMI) reporting components.

[0114] In a twenty-second embodiment, according to the processor of the nineteenth embodiment, the operation also includes receiving a signal from the UE before sending the CSI configuration information, and the signal recommends setting the timeRestrictionforChannelMeaurement information element (IE) and the timeRestrictionforInterferenceMeaurement IE in the CSI configuration information to configured.

[0115] In a twenty-third embodiment, the processor according to the nineteenth embodiment, wherein the type II based CSI feedback includes a CSI report configured to indicate a UE preferred CSI reporting setting.

[0116] In a twenty-fourth embodiment, the processor of embodiment nineteen, wherein the CSI report is received as uplink control information (UCI) on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

[0117] In a twenty-fifth embodiment, according to the processor of the nineteenth embodiment, the operation also includes receiving a UE preferred CSI reporting setting based on an indication provided on a physical random access channel (PRACH) or in an uplink medium access control (MAC) control element (CE).

[0118] In a twenty-sixth embodiment, the processor of embodiment nineteen, wherein the base station configures the UE to send a CSI report with a reporting amount of only a channel quality indicator (CQI).

[0119] In a twenty-seventh embodiment, the processor according to the nineteenth embodiment, wherein receiving the feedback based on the type II codebook also includes using a first periodicity to receive CSI including each of a channel quality indicator (CQI) and a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component, and using a different second periodicity to receive CSI including a CQI reporting component but without the PMI reporting component.

[0120] In a twenty-eighth embodiment, the processor according to the nineteenth embodiment, wherein the type II codebook based CSI feedback uses time domain differential coding for a channel quality indicator (CQI).

[0121] In a twenty-ninth embodiment, the processor according to the nineteenth embodiment, wherein the base station configures the UE to independently report each of the following items at different times: i) wideband channel quality indicator (CQI), ii) subband CQI, and ii) both wideband CQI and subband CQI.

[0122] In a thirtieth embodiment, the processor according to the nineteenth embodiment, wherein the base station configures the UE to report a wideband channel quality indicator with a first periodicity and to report a subband CQI with a different second periodicity.

[0123] In a thirty-first embodiment, the processor according to the nineteenth embodiment, wherein the base station configures the UE to omit a rank indicator (RI) when a current RI value is the same as a value of a previously reported RI.

[0124] In a thirty-second embodiment, the processor according to the nineteenth embodiment, wherein the base station configures the UE to report a rank indicator (RI) with a first periodicity and to report another CSI reporting amount with a different second periodicity.

[0125] In a thirty-third embodiment, the processor according to the nineteenth embodiment, wherein the CSI configuration information includes a reportQuantity information element (IE) for separately configuring different reporting quantities.

[0126] In a thirty-fourth embodiment, a processor according to the nineteenth embodiment, wherein the CSI configuration information includes a reportQuantity information element (IE), and the reportQuantity information element (IE) separately configures one or more of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component.

[0127] In a thirty-fifth embodiment, a base station includes: a transceiver, which is configured to communicate with a user equipment (UE); and a processor, which is communicatively coupled to the transceiver and is configured to perform operations including: sending channel state information (CSI) configuration information to a user equipment (UE) for the UE to report CSI feedback based on a type II codebook; and receiving type II codebook CSI feedback from the UE.

[0128] Those skilled in the art will appreciate that the exemplary embodiments described above may be implemented with any suitable software configuration or hardware configuration or combination thereof. Exemplary hardware platforms for implementing the exemplary embodiments may include, for example, Intel x86-based platforms with compatible operating systems, Windows OS, Mac platforms and MAC OS, mobile devices with operating systems such as iOS, Android, etc. The exemplary embodiments of the above methods may be embodied as a program comprising lines of code stored on a non-transitory computer-readable storage medium, which, when compiled, may be executed on a processor or microprocessor.

[0129] Although this patent application describes various combinations of various embodiments each having different features, those skilled in the art will understand that any feature of an embodiment may be combined with features of other embodiments in any manner not publicly denied or with features that are not functionally or logically inconsistent with the operation or stated function of the device of the embodiments disclosed in the present invention.

[0130] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of the authorized use should be clearly stated to users.

[0131] It will be apparent to those skilled in the art that various modifications may be made to the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure, provided that these modifications and variations are within the scope of the appended claims and their equivalents.

Claims

1. A processor of a user equipment (UE), the processor being configured to perform operations comprising: receiving channel state information (CSI) configuration information for reporting CSI feedback based on a type II codebook; receiving CSI measurement resources; and Sending CSI feedback of the type II codebook to the base station.

2. The processor of claim 1 , wherein the type II codebook-based feedback comprises a CSI report, the CSI report comprising less than all of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component.

3. The processor of claim 1 , wherein the type II codebook-based feedback comprises periodic or semi-persistent feedback, and sending the type II codebook-based feedback further comprises: transmitting CSI including each of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component at a first periodicity; as well as CSI including only one or a subset of the spatial-based PMI reporting component, the frequency-based PMI reporting component, and the combined coefficient PMI reporting component is sent with a second periodicity, wherein the first periodicity is greater than the first periodicity.

4. The processor of claim 1 , wherein the type II codebook-based feedback comprises periodic or semi-persistent feedback, and sending the type II codebook-based feedback further comprises: Sending CSI including a first subset from a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component at a first periodicity; as well as Transmitting CSI including CSI from a second subset of the spatial-based PMI reporting component, the frequency-based PMI reporting component, and the combined coefficient PMI reporting component, wherein the first subset and the second subset include different PMI reporting components.

5. The processor of claim 1 , wherein the operations further comprise: Receiving a radio resource control (RRC) message including a type II codebook-based feedback configuration, wherein the configuration instructs the base station how to interpret the type II codebook-based feedback including a CSI report including an indication that a value of a precoder matrix indicator (PMI) reporting component is the same as a value of a previously sent CSI report.

6. The processor of claim 1 , wherein the type II codebook based CSI feedback uses time domain differential coding for a precoder matrix indicator (PMI) reporting component of a CSI report, and wherein the time differential coding indicates a difference between a current measurement and a previous measurement reported in a previous CSI report. 7 . The processor of claim 6 , wherein the PMI reporting component is one of a reference magnitude for a layer, a differential magnitude of non-zero coefficients (NZC) for a layer, and a phase of the NZC for a layer.

8. The processor of claim 6, wherein the UE is configured to report an absolute value for the PMI reporting component periodically or in response to a trigger condition.

9. The processor of claim 1 , wherein the UE is configured to use a differential reporting technique based on W gNB (k+1)=W gNB (k)*W UE (k+1) to report PMI, where W gNB (k) represents the resulting pre-decoder recommended by the UE to the base station at time (k), and W UE (k) represents the differential pre-decoder reported by the UE to the base station at time (k).

10. The processor of claim 1 , wherein the CSI feedback based on the type II codebook is used for a high-speed UE mobility scenario, and the UE reports a processing capability for the type II codebook for high-speed UE mobility to the base station, the processing capability comprising one or more parameter sets, each parameter comprising a maximum number of ports for a CSI reference signal (RS), a maximum number of CSI-RS resources, and a maximum total number of ports.

11. The processor of claim 1 , wherein the type II codebook based CSI feedback is configured for open-loop or semi-open-loop CSI reporting for one or more precoding matrix indicator (PMI) reporting components.

12. The processor of claim 1 , the operations further comprising: Before receiving the CSI configuration information, a signal is sent to the base station, the signal recommending that a timeRestrictionforChannelMeaurement information element (IE) and a timeRestrictionforInterferenceMeaurement IE be set to configured in the CSI configuration information.

13. The processor of claim 1, wherein the Type II based CSI feedback comprises a CSI report configured to indicate a UE preferred CSI reporting setting.

14. The processor of claim 1, wherein the CSI report is sent on uplink control information (UCI) on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

15. The processor of claim 1 , the operations further comprising: The UE-preferred CSI reporting configuration is sent to the base station in response to a predetermined condition related to the UE's mobility. 16 . The processor according to claim 1 , wherein the CSI configuration information comprises a reportQuantity information element (IE) for individually configuring different reporting quantities.

17. The processor of claim 1, wherein the CSI configuration information comprises a reportQuantity information element (IE), which separately configures one or more of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component.

18. The processor of claim 1, wherein when the UE is configured to perform time domain filtering for PMI, the number of CSI processing units (CPUs) to be counted is based on the reportQuantityIE.

19. The processor of claim 1, wherein when the UE is configured to perform time domain filtering for PMI, a number of active CSI reference signals (RSs) to be counted is based on the reportQuantity_IE.

20. A processor of a base station, the processor being configured to perform operations comprising: Sending channel state information (CSI) configuration information to a user equipment (UE) for the UE to report CSI feedback based on a type II codebook; and receiving CSI feedback of the type II codebook from the UE.

21. The processor of claim 20, wherein the type II codebook based feedback comprises a CSI report comprising less than all of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combining coefficient PMI reporting component.

22. The processor of claim 20, wherein the type II codebook-based feedback comprises periodic or semi-persistent feedback, and receiving the type II codebook-based feedback further comprises: receiving CSI including each of a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component at a first periodicity; as well as CSI including only one or a subset of the spatial-based PMI reporting component, the frequency-based PMI reporting component, and the combined coefficient PMI reporting component is received at a second periodicity, wherein the first periodicity is greater than the second periodicity.

23. The processor of claim 20, wherein the type II codebook-based feedback comprises periodic or semi-persistent feedback, and receiving the type II codebook-based feedback further comprises: receiving, at a first periodicity, CSI comprising a first subset from a spatial-based precoding matrix indicator (PMI) reporting component, a frequency-based PMI reporting component, and a combined coefficient PMI reporting component; as well as A second subset including CSI from the spatial-based PMI reporting component, the frequency-based PMI reporting component, and the combined coefficient PMI reporting component is received, wherein the first subset and the second subset include different PMI reporting components.

24. The processor of claim 20, wherein the operations further comprise: and transmitting a radio resource control (RRC) message including a type II codebook-based feedback configuration, wherein the configuration instructs the base station how to interpret the type II codebook-based feedback including a CSI report including an indication that a value of a precoder matrix indicator (PMI) reporting component is the same as a value of a previously sent CSI report.

25. The processor of claim 20, wherein the type II codebook based CSI feedback uses time domain differential coding for a precoding matrix indicator (PMI) reporting component of a CSI report, and wherein the time differential coding indicates a difference between a current measurement and a previous measurement reported in a previous CSI report.

26. The processor of claim 25, wherein the PMI reporting component is one of a reference magnitude for a layer, a differential magnitude of non-zero coefficients (NZC) for a layer, and a phase of the NZC for a layer.

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