Channel state information measurement and reporting
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2023-07-24
- Publication Date
- 2026-04-29
AI Technical Summary
Current wireless communication systems face challenges in efficiently measuring and reporting channel state information (CSI) across various wireless communication environments, particularly in 5G and future generations like 6G, where high reliability, throughput, and low latency are required.
The proposed solution involves a method for CSI measurement and reporting that includes configuring a CSI report with sub-configurations associated with a resource setting, determining a mapping order for the CSI, and transmitting the CSI report based on this order and configuration. This approach allows for efficient CSI reporting across different wireless communication environments.
This solution enhances the efficiency and effectiveness of CSI measurement and reporting, supporting the high performance requirements of advanced wireless communication systems, including 5G and future generations, by optimizing resource utilization and reducing power consumption.
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Abstract
Description
CHANNEL STATE INFORMATION MEASUREMENT AND REPORTINGTECHNICAL FIELD
[0001] This document is directed generally to wireless communications. More specifically, channel state information (CSI) measurement and reporting are improved.BACKGROUND
[0002] Wireless communication technologies are moving the world toward an increasingly connected and networked society. Wireless communications rely on efficient network resource management and allocation between user mobile stations and wireless access network nodes (including but not limited to wireless base stations) . A new generation network is expected to provide high speed, low latency and ultra-reliable communication capabilities and fulfil the requirements from different industries and users. User mobile stations or user equipment (UE) are becoming more complex and the amount of data communicated continually increases. The transmission rate, delay, throughput, reliability and other performance indexes of wireless communication system have been improved by using high frequency band, large bandwidth, multi-antenna and other technologies. eXtended Reality (XR) and Cloud Gaming are media applications requiring improved performance. XR includes representative forms such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) . These services need high reliability, high throughput, and low latency, while at the same time improving battery life for an improved UE experience.SUMMARY
[0003] This document relates to methods, systems, and devices for channel state information (CSI) measurement and reporting. A CSI report configuration includes sub-configurations and is associated with a resource setting. A mapping order of the CSI for the CSI report is determined. The CSI report is transmitted based on the mapping order and based on the CSI report configuration. The CSI measurement and reporting may be applicable to a wide range of wireless communication environments and networks. For example, it may be applied to fifth generation (5G) communication systems and all future iterations, including but not limited to a sixth generation (6G) communication system.
[0004] In one embodiment, a method for wireless communication includes receiving a radio resource control (RRC) signal with a configuration for a channel state information (CSI) report, the CSI report configuration comprising one or more sub-configurations, wherein the CSI report configuration is associated with a resource setting; determining a mapping order of CSI for the CSI report; and transmitting the CSI report based on the mapping order and based on the CSI report configuration.
[0005] In one embodiment, a method for wireless communication includes transmitting a signal with a configuration for a channel state information (CSI) report, the CSI report configuration comprising one or more sub-configurations; and receiving the CSI report based on the CSI report configuration and based on a mapping order.
[0006] In one embodiment, a wireless communications apparatus comprises a processor and a memory, and the processor is configured to read code from the memory and implement any of the embodiments discussed above.
[0007] In one embodiment, a computer program product comprises a computer-readable program medium code stored thereupon, the code, when executed by a processor, causes the processor to implement any of the embodiments discussed above.
[0008] In some embodiments, there is a wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement any methods recited in any of the embodiments. In some embodiments, a computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement any method recited in any of the embodiments. The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 shows an example basestation.
[0010] FIG. 2 shows an example random access ( “RA” ) messaging environment.
[0011] FIG. 3 shows one example of a channel state information (CSI) report.
[0012] FIG. 4 shows another example of a channel state information (CSI) report.
[0013] FIG. 5 shows one example of channel state information (CSI) reporting.
[0014] FIG. 6 shows another example of channel state information (CSI) reporting with multiple parts.
[0015] FIG. 7 illustrates an example of sub-configurations in two parts.
[0016] FIG. 8 illustrates another example of sub-configurations in two parts.
[0017] FIG. 9 illustrates another example of sub-configurations in two parts with a common CRI.
[0018] FIG. 10 illustrates another example of sub-configurations in two parts with different wideband parameters.DETAILED DESCRIPTION
[0019] The present disclosure will now be described in detail hereinafter with reference to the accompanied drawings, which form a part of the present disclosure, and which show, by way of illustration, specific examples of embodiments. Please note that the present disclosure may, however, be embodied in a variety of different forms and, therefore, the covered or claimed subject matter is intended to be construed as not being limited to any of the embodiments to be set forth below.
[0020] Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment” or “in some embodiments” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment” or “in other embodiments” as used herein does not necessarily refer to a different embodiment. The phrase “in one implementation” or “in some implementations” as used herein does not necessarily refer to the same implementation and the phrase “in another implementation” or “in other implementations” as used herein does not necessarily refer to a different implementation. It is intended, for example, that claimed subject matter includes combinations of exemplary embodiments or implementations in whole or in part.
[0021] In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and / or, ” as used herein may include a variety of meanings that may depend at least in part upon the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” or “at least one” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a” , “an” , or “the” , again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” or “determined by” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
[0022] Radio resource control ( “RRC” ) is a protocol layer between UE and the basestation at the IP level (Network Layer) . There may be various Radio Resource Control (RRC) states, such as RRC connected (RRC_CONNECTED) , RRC inactive (RRC_INACTIVE) , and RRC idle (RRC_IDLE) state.
[0023] To reduce the power consumption of a basestation, there may be a reduction in the number of antennas or antenna ports. The channel may also change if the number of antennas changed. To help a basestation obtain the channel states of different numbers of antennas, multiple channel state information (CSIs) with different antenna patterns may be utilized. The multiple CSIs with different antenna patterns may be obtained by a specific CSI report configuration. The multiple CSIs with different antenna patterns include multiple sets of CSIs, each set of CSIs for one antenna pattern includes at least one of a pre-coding matrix indicator (PMI) , a CSI reference signal resource indicator (CRI) , a rank indicator (RI) , a layer indicator (LI) , or a sub-configuration differential channel quality indicator (CQI) . Mapping these CSI in PUCCH / PUSCH is further described in the embodiments below.
[0024] Figure 1 shows an example basestation 102. The basestation may also be referred to as a wireless network node. The basestation 102 may be further identified to as a nodeB (NB, e.g., an eNB or gNB) in a mobile telecommunications context. The example basestation may include radio Tx / Rx circuitry 113 to receive and transmit signaling with user equipment (UEs) 104. The basestation may also include network interface circuitry 116 to couple the basestation to the core network 110, e.g., optical or wireline interconnects, Ethernet, and / or other data transmission mediums / protocols.
[0025] The basestation may also include system circuitry 122. System circuitry 122 may include processor (s) 124 and / or memory 126. Memory 126 may include operations 128 and control parameters 130. Operations 128 may include instructions for execution on one or more of the processors 124 to support the functioning the basestation. For example, the operations may handle random access transmission requests from multiple UEs. The control parameters 130 may include parameters or support execution of the operations 128. For example, control parameters may include network protocol settings, random access messaging format rules, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.
[0026] Figure 2 shows an example random access messaging environment 200. In the random access messaging environment a UE 104 may communicate with a basestation 102 over a random access channel 252. In this example, the UE 104 supports one or more Subscriber Identity Modules (SIMs) , such as the SIM1202. Electrical and physical interface 206 connects SIM1 202 to the rest of the user equipment hardware, for example, through the system bus 210.
[0027] The mobile device 200 includes communication interfaces 212, system logic 214, and a user interface 218. The system logic 214 may include any combination of hardware, software, firmware, or other logic. The system logic (system circuitry) 214 may be implemented, for example, with one or more systems on a chip (SoC) , application specific integrated circuits (ASIC) , discrete analog and digital circuits, and other circuitry. The system logic 214 is part of the implementation of any desired functionality in the UE 104. In that regard, the system logic 214 may include logic that facilitates, as examples, decoding and playing music and video, e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; running applications; accepting user inputs; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections for, as one example, Internet connectivity; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 218. The user interface 218 and the inputs 228 may include a graphical user interface, touch sensitive display, haptic feedback or other haptic output, voice or facial recognition inputs, buttons, switches, speakers and other user interface elements. Additional examples of the inputs 228 include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headset and microphone input / output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors) , and other types of inputs.
[0028] The system logic 214 may include one or more processors 216 and memories 220. The memory 220 stores, for example, control instructions 222 that the processor 216 executes to carry out desired functionality for the UE 104. The control parameters 224 provide and specify configuration and operating options for the control instructions 222. The memory 220 may also store any BT, WiFi, 3G, 4G, 5G or other data 226 that the UE 104 will send, or has received, through the communication interfaces 212. In various implementations, the system power may be supplied by a power storage device, such as a battery 282
[0029] In the communication interfaces 212, Radio Frequency (RF) transmit (Tx) and receive (Rx) circuitry 230 handles transmission and reception of signals through one or more antennas 232. The communication interface 212 may include one or more transceivers. The transceivers may be wireless transceivers that include modulation / demodulation circuitry, digital to analog converters (DACs) , shaping tables, analog to digital converters (ADCs) , filters, waveform shapers, filters, pre-amplifiers, power amplifiers and / or other logic for transmitting and receiving through one or more antennas, or (for some devices) through a physical (e.g., wireline) medium.
[0030] The transmitted and received signals may adhere to any of a diverse array of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM) , frequency channels, bit rates, and encodings. As one specific example, the communication interfaces 212 may include transceivers that support transmission and reception under the 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS) , High Speed Packet Access (HSPA) +, 4G / Long Term Evolution (LTE) , and 5G standards. The techniques described below, however, are applicable to other wireless communications technologies whether arising from the 3rd Generation Partnership Project (3GPP) , GSM Association, 3GPP2, IEEE, or other partnerships or standards bodies.
[0031] A channel state information (CSI) measurement may include the UE performing measurements based on a CSI reference signal (CSI-RS) and may report to the basestation. A UE can be configured with one or more CSI report configurations by CSI-ReportConfig signaling. The CSI-ReportConfig may associate with one or more CSI-RS resource setting by, e.g., CSI-resourceConfigID. The CSI-RS resource setting may be configured by, e.g., CSI-ResourceConfig signaling. The number of ports of a CSI-RS is configured by nrofPorts in CSI-ResourceMapping, and CSI-ResourceMapping is associated with a NZP-CSI-RS-Resource (a CSI-RS resource) . NZP-CSI-RS-Resource is associated with a NZP-CSI-RS-ResourceSet (a CSI-RS resource set) . A NZP-CSI-RS-ResourceSet is associated with a CSI-ResourceConfig. A CSI-ResourceConfig is associated with a CSI-ReportConfig. The nrofPorts may include: p1, p2, p4, p8, p12, p16, p24, p32.
[0032] FIG. 3 shows another example of a channel state information (CSI) report configuration. A CSI-ReportConfig can be configured with multiple sub-configurations. Each sub-configuration may be configured with at least one of RI restriction, codebook subset restriction and / or port subset indication. Each sub-configuration may be associated with all CSI-RS resources in a resource set. The resource set is in a CSI-ResourceConfig which is associated with the CSI-ReportConfig.
[0033] FIG. 4 shows one example of a channel state information (CSI) report configuration. A CSI report configuration (CSI-ReportConfig) may be configured with multiple sub-configurations, each sub-configuration may configured with a CSI-RS resource list. In some embodiments, a CSI report configuration corresponds to a CSI-ReportConfig configured by RRC signaling. The CSI-RS resource list may include one or more CSI-RS resource ID. Each sub-configuration associates with the one or more CSI-RS resources. The one or more CSI-RS resource is in a CSI-ResourcConfig may be associated with the CSI-ReportConfig.
[0034] For each sub-configuration, the UE may report a set of CSI parameters. The set of CSI parameters includes at least one of the following: CRI, RI, LI, PMI, CQI. Ifmultiple sub-configurations are valid / activated / indicated / used, the UE reports multiple sets of CSI parameters (i.e. a multi-CSIs report) . if a sub-configuration is not valid / activated / indicated / used, UE does not report a set of CSI parameters for the sub-configuration. To report multi-CSIs, each CSI parameter in the multi-CSIs information may include one or more bits. All the bits of CSI parameters in the multi-CSIs are mapped in a bit sequence according to a mapping order. The bits are transmitted to the basestation. The embodiments described herein include how to report multi-CSIs and the mapping order of the CSIs.
[0035] In some embodiments, the UE may not report one or more CSI quantities / parameters including at least one of CRI, RI, LI, PMI, CQI. In these particular embodiments, the mapping order of CSI may be determined by skipping the unreported CSI quantities.
[0036] The CRI may include a common CRI, if reported, or a CRI of a sub-configuration, if reported. The RI can be a common RI or a joint RI, if reported, or the RI is a RI of a sub-configuration, if reported. The LI may be a common LI, if reported, or a LI of a sub-configuration, if reported. The PMI can be a common PMI, if reported, or a PMI of a sub-configuration, if reported. The CQI can be a sub-configuration differential CQI of a sub-configuration, if reported, or a wideband CQI of a sub-configuration, if reported. The RI can be a sub-configuration differential RI of a sub-configuration, if reported, or a RI of a sub-configuration, if reported.
[0037] In some embodiments, a sub-configuration also can be a set, a group, a sub-set, or a sub-group, configured in a CSI report configuration.
[0038] In some embodiments, different sub-configurations may associate with same or different codebook type (e.g., codebook type 1 or codebook type 2) . the CSI parameters generated according to different codebook type may be different. In some embodiments, the CSI parameters for a first kind sub-configurations and the CSI parameters for a second kind sub-configurations are separately mapped. In some embodiments, the CSI report may be reported in one part or multiple parts, in each part of the CSI report, the CSI parameters for a second kind sub-configurations are mapped behind the CSI parameters for a first kind sub-configurations. In some embodiments, the PMI information for a second kind sub-configurations are mapped behind the PMI information for a first kind sub-configurations. In some embodiments, the first kind sub-configuration is the sub-configuration configured with codebook type 1, and the second kind sub-configuration is the sub-configuration configured with codebook type 2.
[0039] In some embodiments, for a CSI report, the CSI parameters for a second kind sub-configurations are mapped behind the CSI parameters for a first kind sub-configurations. For CSI parameters for first kind sub-configurations, the mapping order is same as a mapping order for a multi-CSI report. For CSI parameters for second kind sub-configurations, the mapping order is same as a mapping order for a multi-CSI report. For example, a CSI report configured with L sub-configurations, and these L sub-configurations are indicated to be measured. The CSI report of the L sub-configuration is a first kind CSI report. The L sub-configurations includes N1 first kind sub-configurations and (L-N1) second kind sub-configurations. The CSIs of N1 first kind sub-configurations can be considered as a multi-CSI report#1 and mapped according to mapping order of multi-CSIs in this application. The CSIs of (L-N1) second kind sub-configurations can be considered as a multi-CSI report#2 and mapped according to mapping order of multi-CSIs in this application. The multi-CSI report#2 is mapped behind multi-CSI report#1 and form the first kind CSI report.
[0040] In some embodiments, if a CSI report includes CSI parameters for different codebook types, the CSI report is divided into 2 parts or more parts. In some embodiments, all sub-configurations in one CSI report configuration are associated with a same codebook type.
[0041] In some embodiments, if a CSI report includes CSI parameters for different codebook types, a first kind CSI parameters of second kind sub-configurations has lowest priority. In some embodiments, the first kind CSI parameters includes at least subband differential PMI. In some embodiments, the first kind CSI parameters includes at least subband differential PMI, subband differential CQI for TB 2. in a first kind CSI parameters of first kind sub-configurations has medium priority.
[0042] The mapping order embodiments described below may also include a legacy mapping order, which includes ‘CRI, or RI, or LI or PMI wideband information 1, or PMI wideband information 2, or wideband CQI for the first TB, or wideband CQI for the second TB’ , if available for a baseline sub-configuration. It may also include “CRI, RI, and CQI for the first TB” , if available are in part 1, and “Wideband CQI for TB2, LI, PMI information 1, PMI information 2” , if available, are in part 2 wideband. “Subband differential CQI for TB2 and PMI subband information” , if available, are in part 2 subband. Legacy mapping order may include the mapping order of a multi-CSI report without overhead reduction. A multi-CSI report without overhead reduction means the multi-CSI report does not include a common PMI, a common CRI, a common RI, a common LI, a joint RI, a sub-configuration differential CQI, or a sub-configuration differential RI. The legacy mapping order may be a mapping order of CSI parameters for one sub-configuration or is the mapping order of one set of CSI parameters. A multi-CSI report with overhead reduction means the multi-CSI report includes a common PMI, a common CRI, a common RI, a common LI, a joint RI, a sub-configuration differential CQI, or a sub-configuration differential RI.
[0043] As described herein, the usage of “ ‘parameter A, parameter B, ..., parameter N’ , if available / reported” may mean that parameter A, if available / reported, parameter B, if available / or reported, .., parameter N, if available / reported.
[0044] Single Part CSI Report
[0045] FIG. 5 shows one example of channel state information (CSI) reporting. In block 502, a radio resource control (RRC) signal is sent from the basestation to the UE that includes at least one CSI report configuration. The CSI report configurations are associated with a CSI reference signal (CSI-RS) resource setting. The CSI report configurations include one or more sub-configurations. A mapping order based on the CSI report is determined in block 504. The CSI report is transmitted based on the mapping order and / or the configuration in block 506.
[0046] If a CSI report configuration configured with multiple sub-configurations is activated, indicated, or used and one or more sub-configuration (s) is activated, indicated, or used, the UE may report multi-CSIs according to the CSI report configuration and the one or more sub-configuration (s) . The multi-CSIs may include multiple sets of CSIs. Each set of CSIs is associated with a sub-configuration in the one or more sub-configuration (s) . In some embodiments, for a CSI-ReportConfig configured with multiple sub-configurations, and when more than one sub-configuration is activated, the UE may report a multi-CSIs report. The multi-CSIs report may include at least one of a common PMI, common CRI, common RI, common LI, sub-configuration differential RI, sub-configuration differential CQI, joint RI, worst layer indication, or a valid column indication. Common PMI / CRI / RI / LI may result in only one PMI / CRI / RI / LI needing to be reported for all the activated sub-configurations in the multi-CSI report. The PMI / CRI / RI / LI for each sub-configuration may be directly using the common PMI / CRI / RI / LI or may be derived from the common PMI / CRI / RI / LI. The sub-configuration differential RI / CQI may result in only a RI / CQI of a baseline sub-configuration being reported. For other sub-configurations, a sub-configuration differential RI / CQI may be reported. The sub-configuration differential RI / CQI may indicate a differential value between the RI / CQI of a baseline sub-configuration and a second sub-configuration. A worst layer indication may indicate a worst column in a precoding matrix for a sub-configuration. A valid column indication may indicate one or more columns in a precoding matrix for a sub-configuration.
[0047] When the CSI report is transmitted in one part, the mapping order of CSI parameters (such as ‘CRI, RI, LI, PMI, CQI’ , if reported) corresponding to the one or more sub-configurations are multiplexed into one part. CRI may include CRI, or common CRI, if reported. RI may include RI, joint RI, or differential RI, if reported. LI may include LI, or common LI, if reported. CQI may include wideband CQI, or sub-configuration differential CQI, if reported. PMI may include PMI or common PMI, if reported. PMI may include PMI (wideband) information 1 or 2. Subband PMI can be subband PMI or common subband PMI, if reported.
[0048] The mapping order may be determined as a CSI parameter first and as a sub-configuration index second, or as a sub-configuration index first and as a CSI parameter second. Table 1 is a an example mapping order of CSI fields of multi-CSIs report. The CSI report includes various parameters (e.g. rank indicator, layer indicator, etc. ) which are shown in a particular order in Table 1-1. All parameters are mapped first for CSI report#1, then for CSI report#2.
[0049] Table 1-1: Mapping order of CSI fields of multi-CSIs report.
[0050] Table 1-2: mapping order of CSIs of all sub-configurations for a CSI report CSI can be CRI or RI, or LI or PMI or wideband CQI, in Table 1-2.
[0051] Sub-configuration#1, sub-configuration#2, ..., sub-configuration#N correspond to the sub-configurations in increasing order of sub-configuration index of the one or more activated sub-configurations.
[0052] The mapping order may be determined as a sub-configuration index first and a CSI parameter second. For one example embodiment: For a ‘CRI, or RI, or LI or PMI wideband information 1, or PMI wideband information 2, or wideband CQI for the first TB, or wideband CQI for the second TB’ of all sub-configurations for the CSI report, the mapping order may be as shown in Table 2.
[0053] Table 2: Mapping order of CSI fields of multi-CSIs report.
[0054] The number of zero padding bits Op in Table 2 is wherein O (i) is the number of zero padding bits for sub-configuration#i. O (i) is 0 if the sub-configuration associated with 1 CSI-RS port and O (i) =Nmax-Nreported (R) for more than 1 CSI-RS port. Wherein Srank is the set of rank and rank combination values r that are allowed to be reported. N (r) is number of bits for all CSI with rank r. Nreported (R) is the number of bits for all CSI with rank R, R is the reported rank for a sub-configuration.
[0055] Sub-configuration#1, sub-configuration#2, through sub-configuration#N correspond to the sub-configurations in increasing order of sub-configuration index of the one or more activated / indicated / used sub-configurations. In some embodiments, the index of sub-configuration is starts from 0. The example above shows the index of sub-configuration starts from 1. Mapping order is determined using sub-configuration index first and CSI parameter second.
[0056] In one example embodiment, the mapping order is determined as CSI parameter first and sub-configuration index second as in Table 3. In some embodiments, a padding bit is used between all CSI of sub-configuration#i and all CSI of sub-configuration#i+1. There may be zero padding bits between layer indicator and PMI wideband information of each sub-configuration. The number of zero padding bits Op for sub-configuration#i is O (i) . O (i) is 0 if the sub-configuration associated with 1 CSI-RS port and O (i) =Nmax-Nreported (R) for more than 1 CSI-RS port.
[0057] Table 3: Mapping order of CSI fields of multi-CSIs report.
[0058] The mapping order may be determined as CSI parameter first and sub-configuration index second, or sub-configuration index first and CSI parameter second. When there are multiple sub-configurations, then those parameters may be important and placed first in the mapping order. A first kind CSI parameter is mapped according to a CSI parameter first and a sub-configuration index second. Second kind CSI parameters are mapped according to sub-configuration index first and CSI parameters second. In some embodiments, first kind CSI parameters includes at least one of ‘CRI, RI, or LI’ , if reported. In some embodiments, second kind CSI parameters include at least one of ‘PMI, CQI, LI, or RI’ , if reported. In some embodiments, first kind CSI parameters include at least one of ‘LI, PMI, or CQI’ , if reported. In some embodiments, a second kind CSI parameters includes at least one of ‘CRI, LI, or RI’ , if reported. PMI may include at least one of PMI wideband information 1, and / or PMI wideband information 2. CQI may include at least one of a wideband CQI for the first TB, and wideband CQI for the second TB.
[0059] In another example embodiment shown in Table 4-1, the CRI, RI, and LI may be the most important so they are mapped first before the others, which are less important.
[0060] Table 4-1: Mapping order of CSI fields of multi-CSIs report.
[0061] A first kind CSI parameter is mapped according to a CSI parameter first and a sub-configuration index second. Second kind CSI parameters are mapped according to sub-configuration index first and CSI parameters second. In some embodiments, first kind CSI parameters includes all CSI parameters for a first kind sub-configurations. The second kind CSI parameters includes all CSI parameters for the sub-configuration other than the first kind sub-configurations. In some embodiments, the first kind sub-configurations is baseline sub-configuration. In some embodiments, the first kind sub-configurations is the sub-configurations with first M index. M=2, 3.
[0062] In another example embodiment shown in Table 4-2, the first kind sub-configurations is baseline sub-configuration. The CSI parameters of baseline sub-configuration may be the most important so they are mapped first before the others, which are less important.
[0063] Table 4-2: Mapping order of CSI fields of multi-CSIs report.
[0064] In some embodiments, the CSI report includes at least one of common PMI, common CRI, common RI, common LI, or joint RI. The common CRI / RI / LI / PMI or joint RI is mapped first, and the other CSI parameters of sub-configurations are following the common CRI / RI / LI / PMI. The following example in Table 5 includes additional CSI parameters that are reported. The mapping order of common CRI / RI / LI / PMI is according to the CSI parameters order. The mapping order of other CSI parameters of sub-configurations is determined as sub-configuration index first and CSI parameters order second, or CSI parameters order first and sub-configuration index second. The CSI parameter order may be ‘CRI, RI, LI, PMI, CQI’ , if reported. For example, a CSI report includes a common CRI, the mapping order of other CSI parameters is as shown in Table 5 with CSI parameters order first and sub-configuration index second. In this example, the common CRI is reported, while the CRI for other sub-configurations do not need to be reported.
[0065] Table 5: Mapping order of CSI fields of multi-CSIs report.
[0066] In another example embodiment, a CSI report includes a common CRI and a common PMI. The mapping order may be as shown in Table 6 with a sub-configuration index CSI first parameters order second. The common PMI may include PMI wideband information 1 and PMI wideband information 2, or common PMI are in one field.
[0067] Table 6: Mapping order of CSI fields of multi-CSIs report.
[0068] In some embodiments, the CSI report includes at least one of common PMI, a worst layer indication, or a valid column indication. The common PMI may be mapped first, and the other CSI parameters of sub-configurations follow the common PMI. In some embodiments, the CSI parameters order is ‘CRI, RI, LI, CQI, worst layer indication or valid column indication’ , if reported. In some embodiments, the CSI parameters order is ‘CRI, RI, worst layer indication or valid column indication, LI, CQI’ , if reported. In some embodiments, the CSI parameters order is ‘worst layer indication or valid column indication, CRI, RI, LI, CQI’ , if reported. In some embodiments, the CSI parameters order is ‘CRI, RI, LI, worst layer indication or valid column indication, CQI’ , if reported. In some embodiments, the CSI parameters order is ‘worst layer indication or valid column indication, CRI, RI, LI, CQI’ , if reported. The example embodiment shown in Table 7 includes a CSI parameter order of CRI, RI, LI, CQI, worst layer indication or valid column indication.
[0069] Table 7: Mapping order of CSI fields of multi-CSIs report.
[0070] In some embodiments, the CSI report includes at least one of common PMI, common CRI, common RI, common LI, or joint RI. The common CRI / RI / LI / PMI or joint RI is mapped according to a CSI parameters order of baseline sub-configuration. In another word, the common CRI / RI / LI / PMI or joint RI is mapped according to a legacy parameters mapping order of a sub-configuration or according to a mapping order without overhead reduction. In this example, the CSI report order may be similar to sub-configuration#1 and common parameters are mapped in order for sub-configuration#1 as shown in Table 8. the number of zero padding bits for sub-configuration#1 is determined by at least the common CRI / RI / LI / PMI, and the other CSI parameters for sub-configuration#1, if reported.
[0071] Table 8: Mapping order of CSI fields of multi-CSIs report.
[0072] In some embodiments, the CSI report includes at least a sub-configuration differential RI / CQI. The sub-configuration differential RI / CQI is mapped the same as the RI / CQI of a sub-configuration. For example, the mapping order of the CSI report is determined as CSI parameters order first and sub-configuration index second. The CSI parameter order for sub-configuration#1 (i.e. baseline sub-configuration) is ‘CRI, RI, LI, PMI, CQI’ , if reported. In Table 9, the CSI parameter order for other sub-configuration#1 is ‘CRI, sub-configuration differential RI (or RI, ifnot including sub-configuration differential RI) , LI, PMI, sub-configuration differential CQI (or CQI, ifnot including sub-configuration differential CQI) ’ , if reported.
[0073] Table 9: Mapping order of CSI fields of multi-CSIs report.
[0074] In one example, a CSI report includes a common CRI / RI / PMI / LI and a differential RI / CQI, with the common CRI / RI / PMI / CQI being mapped first. Other CSI parameters are mapped following the common CRI / RI / PMI / CQI as shown in Table 10
[0075] Table 10: Mapping order of CSI fields of multi-CSIs report.
[0076] Multiple Part CSI Report
[0077] The example embodiments described may include the CSI report in a single part as described above. In an alternative embodiment, the CSI report may be in multiple parts. If the number of bits in a CSI report is large, the CSI report may need to be split into multiple parts. In one example, it may be split into two parts. The bits in the second part can be dropped if the resource used to carry the CSI report cannot carry all bits.
[0078] FIG. 6 shows another example of channel state information (CSI) reporting with multiple parts. In block 602, a radio resource control (RRC) signal is sent from the basestation to the UE that includes at least one CSI report configuration. The CSI report configurations are associated with a CSI reference signal (CSI-RS) resource setting. The CSI report configurations include one or more sub-configurations. A mapping order based on the CSI report is determined in block 604. The UE can determine the number of parts of a CSI report based on channel type, frequency granularity, or a number of sub-configurations in block 606. The CSI report is transmitted based on the mapping order and / or the configuration in block 608. Embodiments with multiple parts and with single parts are further described below. Embodiments with multiple parts may be described as having two parts in one embodiment, but may include more than two parts.
[0079] The multi-CSIs of a CSI report may transmitted in one part or split into two parts as in Figure 6. In one embodiment, if a CSI report is transmitted on PUCCH, and the CSIs is Type I CSI with wideband frequency granularity, the CSI report may be reported in one part. Otherwise, the CSI report is split into multiple parts. In one embodiment, if a CSI report associated with multiple sub-configurations, and the CSI report is transmitted on PUCCH, and the CSIs is Type I CSI with wideband frequency granularity, then when the number of the multiple sub-configurations is less than a first threshold value, the CSI report is reported in one part. Otherwise, the CSI report is split into two parts. The first threshold value may be an integer less than 4. In one embodiment, if a CSI report associated with multiple sub-configurations, the CSI report may be split into multiple parts.
[0080] For each part of the CSI report, a first kind CSI can be mapped according to map sub-configuration index first and CSI parameters second, and a second kind CSI can be mapped according to CSI parameters first and sub-configuration index second. The first kind CSI and second kind CSI may be CSI parameters for different sub-configurations. The first kind CSI and second kind CSI may be different CSI parameters for same sub-configurations. The first kind CSI and second kind CSI may be different CSI parameters for different sub-configurations.
[0081] When the CSI report is transmitted in 2 parts, the mapping order of CSI parameters (such as ‘CRI, RI, LI, PMI, CQI’ , if reported) corresponds to the one or more sub-configurations being multiplexed into 2 parts. In one embodiment, part 1 of the CSI report includes ‘CRI, RI, and CQI for the first TB’ for all the sub-configurations, if available / reported. The mapping order is determined as CSI parameter first and sub-configuration index second, or sub-configuration index first and CSI parameter second. CQI for the first TB includes wideband CQI and subband differential CQI. As described, the CSI report is transmitted into multiple parts (2 in this example) . Each part may have subsets such that parameters are divided into subsets. Subbands for a given CSI report n may be indicated by the higher layer parameter csi-ReportingBand and numbered continuously in the increasing order with the lowest subband of csi-ReportingBand as subband 0. This example with sub-configuration index first and CSI parameter second is shown in Table 11.
[0082] Table 11: Mapping order of CSI fields of multi-CSIs report.
[0083] In another example, the CSI parameter is first and the sub-configuration index second. The mapping order is according to ‘CRI, RI, and CQI for the first TB’ if reported for the sub-configuration#1, ‘CRI, RI, and CQI for the first TB’ , if reported for all the sub-configuration #2. Subbands for a given CSI report n may be indicated by the higher layer parameter csi-ReportingBand and numbered continuously in the increasing order with the lowest subband of csi-ReportingBand as subband 0 as in Table 12.
[0084] Table 12: Mapping order of CSI fields of multi-CSIs report.
[0085] In some embodiments, part 2 of the CSI report includes 2 subsets. In one example, subset 1 includes wideband CSI parameters and the subset 2 includes subband CSI parameters. In this example, subband information is not as important so it is ordered after wideband CSI parameters of subset 1. In some embodiments, subset 1 includes ‘Wideband CQI for TB2, LI, PMI information 1, PMI information 2’ of all sub-configurations, if is reported. In some embodiments subset 2 includes: subband differential CQI for TB2 and PMI subband information of all other sub-configurations. In some embodiments, ‘subband differential CQI for TB2 and PMI subband information’ , if reported includes:
[0086] ● Subband differential CQI for the TB 2 of all even subbands with increasing order of subband number;
[0087] ● PMI subband information X2 of all even subbands with increasing order of subband number;
[0088] ● Subband differential CQI for the TB 2 of all odd subbands with increasing order of subband number; and
[0089] ● PMI subband information X2 of all odd subbands with increasing order of subband number.
[0090] ● The mapping order is as the above.
[0091] In some embodiments, subband differential CQI for TB2 and PMI subband information if reported includes:
[0092] ● Subband differential CQI for the TB 2 for all subbands with increasing order of subband number; and
[0093] ● PMI subband information X2 for all subbands with increasing order of subband number.
[0094] ● The mapping order is shown above.
[0095] In some embodiments, mapping order of CSIs in subset 1 is determined as CSI parameter first and sub-configuration index second, or sub-configuration index first and CSI parameter second. In some embodiments, the mapping order of CSIs in subset 2 can be determined as CSI parameter first and sub-configuration index second. The CSI parameter order may include ‘wideband CQI for TB2, LI, PMI information 1, PMI information 2’ if is reported, respectively, or ‘subband differential CQI for the TB 2 of all even subbands, PMI subband information X2 of all even subbands, subband differential CQI for the TB 2 of all odd subbands, PMI subband information X2 of all odd subbands’ if is reported respectively. Sub-configuration#1 may include the first indicated / activated sub-configuration, or the indicated / activated sub-configuration with lowest index. In some examples, the first sub-configuration or the sub-configuration is configured with index 1 or index 0.
[0096] Table 13: Mapping order of CSI fields of wideband subset 1.
[0097] Table 14: Mapping order of CSI fields of subband subset 2.
[0098] Figure 7 illustrates an example of sub-configurations in two parts. In one embodiment, parts of CSI parameters of a baseline sub-configuration are in part 1. The overhead of CSI part 1 should be smaller, and the priority of the baseline sub-configuration is higher than others. Putting the information of baseline sub-configuration in part 1 may ensure they will not be dropped. In some embodiments, part 1 of the CSI report includes ‘CRI, RI, and CQI for the first TB’ for the baseline sub-configurations, if reported. This embodiment may have parameters for a single sub-configuration. For part 1, there may be parameters from one sub-configuration, the other parameters are moved to part 2 subsets–either wideband or subband. The mapping order may be shown in Table 15.
[0099] Table 15: Mapping order of CSI fields of CSI part 1.
[0100] Part 2 may include two subsets. Subset 1 includes wideband CSI parameters and the subset 2 includes subband CSI parameters. In some embodiments subset 1 includes: ‘CRI, RI, wideband CQI for TB1, subband differential CQI for TB 1’ of other sub-configuration, if reported, and ‘wideband CQI for TB2, LI, PMI information 1, PMI information 2’ of all sub-configurations, if reported. The mapping order of subset 1 can be determined as ‘CRI, RI, wideband CQI for TB1, subband differential CQI for TB 1’ of other sub-configuration first and ‘wideband CQI for TB2, LI, PMI information 1, PMI information 2’ of all sub-configurations second. The mapping order of ‘CRI, RI, wideband CQI for TB1, subband differential CQI for TB 1’ of other sub-configuration can determined as sub-configuration index first and CSI parameter second, or determined as CSI parameter first and sub-configuration index second. The mapping order of ‘Wideband CQI for TB2, LI, PMI information 1, PMI information 2’ of all sub-configurations may be determined as sub-configuration index first and CSI parameter second, or determined as CSI parameter first and sub-configuration index second. In some embodiments, subset 2 includes: ‘subband differential CQI for TB2 and PMI subband information’ of all other sub-configurations. The mapping order of subset 2 can determined as sub-configuration index first and CSI parameter second, or determined as CSI parameter first and sub-configuration index second. If the Part 2 needs to be dropped, ‘CRI, RI, wideband CQI for TB1, subband differential CQI for TB1’ of other sub-configurations in part 2 subset 1 has highest priority, and ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of all sub-configurations in subset 1 in part 2, has second priority. And CSI parameters in part 2 subset 2, has lowest priority in the CSI report.
[0101] FIG. 8 illustrates another example of sub-configurations in two parts. Part 2 includes additional parameters. Sub-configuration#1 may be a baseline sub-configuration. Sub-configuration#2 may be the first sub-configuration among all the other sub-configurations shown in Table 16.
[0102] Table 16: Mapping order of CSI fields of CSI part 2.
[0103] In another embodiment, part 1 of the CSI report includes a third kind of CSI parameter for a baseline sub-configurations. Part 1 shows more CSI parameters than the prior embodiments with fewer sub-configurations. The third kind CSI parameters includes at least one of the following (in example mapping order) :
[0104] ● CRI of Baseline sub-configuration, if reported;
[0105] ● RI of Baseline sub-configuration, if reported;
[0106] ● wideband CQI for TB1 of Baseline sub-configuration, if reported;
[0107] ● subband differential CQI for TB 1 of Baseline sub-configuration, if reported;
[0108] ● wideband CQI for TB2 of Baseline sub-configuration, if reported;
[0109] ● LI of baseline sub-configuration, if reported;
[0110] ● PMI information 1 of baseline sub-configuration, if reported;
[0111] ● PMI information 2 of baseline sub-configuration, if reported;
[0112] ● Subband differential CQI for the TB 2 of baseline sub-configuration of all even subbands with increasing order of subband number, if reported;
[0113] ● PMI subband information X2 of baseline sub-configuration of all even subbands with increasing order of subband number, if reported;
[0114] ● Subband differential CQI for the TB 2 of baseline sub-configuration of all odd subbands with increasing order of subband number; and / or
[0115] ● PMI subband information X2 of baseline sub-configuration of all odd subbands with increasing order of subband number.
[0116] Part 2 may include 2 subsets. Subset 1 includes wideband CSI parameters and subset 2 includes subband CSI parameters. In some embodiments subset 1 includes:
[0117] ● CRI of other sub-configurations, if reported;
[0118] ● RI of other sub-configurations, if reported;
[0119] ● wideband CQI for TB1 of other sub-configurations, if reported; and / or
[0120] ● subband differential CQI for TB 1 of other sub-configurations, if reported.
[0121] In some embodiments subset 2 includes:
[0122] ● Wideband CQI for TB2 of all sub-configurations, if reported;
[0123] ● LI of all sub-configurations, if reported;
[0124] ● PMI information 1 of all sub-configurations, if reported;
[0125] ● PMI information 2 of all sub-configurations, if reported; and / or
[0126] ● ‘subband differential CQI for TB2 and PMI subband information’ of all sub-configurations, if reported.
[0127] In some embodiments subset 1 includes:
[0128] ● CRI of other sub-configurations, if reported;
[0129] ● RI of other sub-configurations, if reported;
[0130] ● wideband CQI for TB1 of other sub-configurations, if reported;
[0131] ● subband differential CQI for TB 1 of other sub-configurations, if reported;
[0132] ● Wideband CQI for TB2 of all sub-configurations, if reported;
[0133] ● LI of all sub-configurations, if reported;
[0134] ● PMI information 1 of all sub-configurations, if reported; and / or
[0135] ● PMI information 2 of all sub-configurations, if reported.
[0136] In some embodiments subset 2 may be the same as the embodiments described above. In another embodiment, part 1 of the CSI report includes a third kind of CSI parameters of the baseline sub-configurations and ‘CRI, RI, and CQI for the TB1’ for all other sub-configurations, if reported. The mapping order may be determined as a third kind of CSI parameters of the baseline sub-configurations first and ‘CRI, RI, and CQI for the TB1’ of all other sub-configurations, if reported second. The mapping order of third kind of CSI parameters of the baseline sub-configurations can use the mapping order above. The mapping order of ‘CRI, RI, and CQI for the TB1’ of all other sub-configurations can be determined as CSI parameter first and sub-configuration index second, or sub-configuration index first and CSI parameter second. If the Part 2 needs to be dropped, ‘CRI, RI, wideband CQI for TB1, subband differential CQI for TB1’ of other sub-configurations in part 2 subset 1 has highest priority, and ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of all sub-configurations in subset 1 in part 2, has second priority. And CSI parameters in part 2 subset 2, has lowest priority in the CSI report. In another embodiment, if the Part 2 needs to be dropped, CSI parameters of baseline sub-configurations in part 2 subset 1 has highest priority, and CSI parameters of other sub-configurations in subset 1 in part 2, has second priority. And CSI parameters in part 2 subset 2, has lowest priority in the CSI report.
[0137] The baseline sub-configuration may include: a sub-configuration with index#0 or index#1, a sub-configuration with lowest index among the one or more activated / indicated sub-configurations, a sub-configuration with lowest index among the one or more configured sub-configurations, a sub-configuration with the largest number of ports, a sub-configuration with largest or smallest power offset value, or a predefined sub-configuration. Other sub-configurations are the activated sub-configurations which are not the baseline sub-configuration. Other sub-configurations are the sub-configurations which are not the baseline sub-configuration. Part 2 may include two parts. Subset 1 includes wideband CSI parameters and the subset 2 includes subband CSI parameters. In some embodiments, subset 1 includes: ‘wideband CQI for TB2, L1, PMI information 1, PMI information 2’ of other sub-configurations, if reported. Power offset corresponds to powerControlOffset or powerControlOffsetSS. powerControlOffset: which is the assumed ratio of PDSCH EPRE to NZP CSI-RS EPRE when UE derives CSI feedback. It takes values in the range of [-8, 15] dB with 1 dB step size. powerControlOffsetSS: which is the assumed ratio of NZP (Non-zero power) CSI-RS EPRE to SS / PBCH block EPRE (Energy per resource element) ) .
[0138] In another embodiment, part 1 includes ‘CRI, RI, Wideband CQI for the first TB’ of all sub-configurations, if reported. The mapping order is may be as shown in Table 17 for part 1.
[0139] Table 17: Mapping order of CSI fields of CSI part 1.
[0140] Part 2 wideband may include ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of all sub-configurations, if reported. Part 2 subband includes ‘subband differential CQI for first TB, subband differential CQI for second TB, subband PMI information’ of all sub-configurations, if reported. If the Part 2 needs to be dropped, all CSIs in part 2 subband has lowest priority, and CSI parameters of other sub-configurations in wideband part 2, has second priority. And CSI parameters of baseline sub-configurations in wideband part 2, has largest priority in the CSI report.
[0141] In another embodiment, part 1 includes ‘CRI, RI, Wideband CQI for the first TB, subband differential CQI for first TB’ of all sub-configurations, if reported. The mapping order is may be as shown in Table 17 for part 1. Part 2 wideband may include ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of all sub-configurations, if reported. The mapping order is mapping ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of baseline sub-configuration, if reported, firstly, and mapping ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of other sub-configurations, if reported, secondly. Mapping ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of other sub-configuration, if reported, secondly is according to sub-configuration index first and CSI parameter second. Part 2 subband includes ‘subband differential CQI for second TB, subband PMI information’ of all sub-configurations, if reported. If the Part 2 needs to be dropped, all CSIs in part 2 subband has lowest priority, and ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of other sub-configurations in wideband part 2, has second priority. And ‘wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2’ of baseline sub-configurations in wideband part 2, has largest priority in the CSI report.
[0142] In some embodiments, when the CSI report includes at least a common CRI, common RI, common LI, common PMI, or a joint RI, the common CRI, common RI, common LI, common PMI, joint RI may be regarded as the CRI, RI, LI, PMI, RI of baseline sub-configuration, respectively. The mapping order of common CRI, common RI, common LI, common PMI, and joint RI may be the same as the CRI, RI, LI, PMI, RI of a baseline sub-configuration in above embodiments.
[0143] In some embodiments, when the CSI report includes at least a sub-configuration differential RI / CQI. The sub-configuration differential RI / CQI may be regarded as the RI / CQI of corresponding sub-configuration, respectively. The mapping order of sub-configuration differential RI / CQI RI may be the same as the RI / CQI of corresponding sub-configurations in above embodiments. In some embodiments, when CSI report includes at least a common CRI, common RI, common LI, common PMI, joint RI, they are in part 1.
[0144] In some embodiments, when the CSI report includes at least a common PMI, worst layer indication, or valid column indication, then the worst layer indication, or valid column indication is in part 1 or part 2 wideband. In some embodiments, the worst layer indication, or valid column indication of a sub-configuration may follow RI or LI, if reported. In some embodiments, the worst layer indication, or valid column indication of a sub-configuration can be regarded as RI or LI, so the mapping of the worst layer indication, or valid column indication of a sub-configuration may be the same as the RI or LI of a corresponding sub-configuration. In some embodiments, the worst layer indication, or valid column indication is in part 2 subband.
[0145] FIG. 9 illustrates another example of sub-configurations in two parts with a common CRI.
[0146] FIG. 10 illustrates another example of sub-configurations in two parts with common CRI, common LI, and common PMI. The common LI and common PMI are different in this example despite the mapping order being the same.
[0147] If the CSI report is transmitted in 2 parts, the UE may omit a portion of the Part 2 CSI. For example, less important CSI parameters may be dropped from the CSI report. This may be reflected in the mapping order which includes priority parameters first, so the parameters at the end may be dropped as being less important.
[0148] Omission of part 2 CSI may be according to the priority order shown in an example of Table 18 below. In Table 18, NRep is the number of CSI reports configured to be carried on a PUSCH or PUCCH. Priority 0 is the highest priority and priority 2NRep is the lowest priority and the CSI report n corresponds to the CSI report with the nth smallest PriAi, CSI value among the NRep CSI reports. The subbands for a given CSI report n are indicatedby the higher layer parameter csi-ReportingBand are numbered continuously in increasing order with the lowest subband of csi-ReportingBand as subband0. in one embodiments, when omitting Part 2 CSI information for a particular priority level, the UE shall omit all of the information at that priority level.
[0149] Table 18: Priority order with omission of Part 2. Example 1 may include multiple set reporting with legacy priority, while Example 2 includes sub-configurations.
[0150] If the Part 2 needs to be dropped, all CSIs in part 2 subband has lowest priority, and CSI parameters of other sub-configurations in wideband part 2, has second priority. And CSI parameters of baseline sub-configurations in wideband part 2, has largest priority in the CSI report.
[0151] A CSI report is configured with one or more sub-configurations or reports multi-CSIs. In some embodiments, group 0 / 1 / 2 may just not exist, and only represents the discard order or position in the table. In some embodiments, group 0 / 1 / 2 may exist. In some examples, group 0 includes all information in part 2 wideband. Group 1 includes even subband CSI information in part 2 subband. Group 2 includes odd subband CSI information in part 2 subband. In some examples, group 0 includes all CSIs for a baseline sub-configuration which in part 2, group 1 includes a parameter group A of all other sub-configurations in part 2, group 2 includes parameters other than parameter group A of all other sub-configurations in part 2.
[0152] Example, parameter group A may include:
[0153] ● at least “CRI, RI, wideband CQI for TB1, PMI information 1, wideband PMI information 2” if reported, or
[0154] ● at least “CRI, RI, wideband CQI for TB1” if reported, or
[0155] ● “CRI, RI, wideband CQI for TB1, subband differential CQI for TB1, PMI information 1, wideband PMI information 2” if reported, or
[0156] ● “LI, PMI information 1, wideband PMI information 2” if reported, or
[0157] ● “wideband CQI for TB2, LI, PMI information 1, wideband PMI information 2” if reported.
[0158] ● Parameters other than parameter group A includes ‘subband differential CQI for TB2, subband PMI information 2. ’
[0159] In some examples, group 0 includes parameter group C of first kind sub-configurations, group 1 includes parameter group C of sub-configurations other than first kind sub-configurations, group 2 includes parameter other than group C of all sub-configurations in part 2. Examples include:
[0160] ● Parameter group C includes at least ‘LI, PMI information 1, wideband PMI information 2’ if reported. Parameters other than group C includes ‘wideband CQI for TB2, subband differential CQI for TB2, subband PMI information 2 (or X2) ’ if reported.
[0161] ● Parameter group C includes at least ‘wideband CQI1 for TB2, LI, PMI information 1, wideband PMI information 2’ if reported. Parameters other than group C includes ‘subband differential CQI for TB2, subband PMI information 2 (or X2) ’ if reported.
[0162] ● Parameter group C includes at least ‘wideband CQI1 for TB2, LI, PMI information 1, wideband PMI information 2’ if reported. Parameters other than group C includes ‘subband differential CQI for TB1, subband differential CQI for TB2, subband PMI information 2 (or X2) ’ if reported.
[0163] First kind sub-configuration is the sub-configurations configured with first N index. In some embodiments, First kind sub-configuration is the activated / indicated sub-configurations with first N index. N is an integer greater than 0 and less than4. In some embodiments, group 0 includes all information in part 2 wideband. Group 1 includes CSI information of sub-configurations configured with even indexes in part 2 subband. Group 2 includes CSI information of sub-configurations configured with odd indexes in part 2 subband. Part 2 wideband also includes subset 1 in part 2, while part 2 subband also refers to subset 2 in part 2. In some examples, group 0 includes common CSIs if reported. Group 1 includes other CSI parameters in part 2 wideband if reported. Group 2 includes part 2 subband. In some examples, group 0 includes at least CSIs of baseline sub-configuration in part 2 wideband, if reported. Group 1 includes CSIs of other sub-configurations in part 2 wideband. Group 2 includes part 2 subband.
[0164] The omission of Part 2 CSI may be according to the priority order shown in Table 18. NRep is the number of CSI reports configured to be carried on the PUSCH or PUCCH. Priority 0 is the highest priority and priority 2NRep is the lowest priority and the CSI report n corresponds to the CSI report with the nth smallest PriAi, CSI value among the NRep CSI reports. The subbands for a given CSI report n indicated by the higher layer parameter csi-ReportingBand are numbered continuously in increasing order with the lowest subband of csi-ReportingBand as subband0. When omitting Part 2 CSI information for a particular priority level, the UE shall omit the information according to a Pri3 or a predefined rule at that priority level if the CSI report configured with one or more sub-configurations or includes multi-CSIs report; and UE shall omit all of the information at that priority level, otherwise. In some embodiments, Pri3 is determined according to at least one of the following: sub-configuration index, number of sub-configuration at the priority level (D) , number of sub-configuration for the CSI report (E) , a first indicator (A) , a second indicator (B) , or a third indicator (C) .
[0165] ● The first indicator indicates whether a CSI for a sub-configuration is a wideband CSI or a subband CSI. For example, first indicator is 0 for wideband CSI, and first indicator is 1 for subband CSI.
[0166] ● The second indicator indicates whether a sub-configuration is a baseline sub-configuration or an other sub-configuration. For example, second indicator is 0 for baseline sub-configuration, and is 1 for other sub-configuration.
[0167] ● Third indicator indicates sub-configuration index.
[0168] For example, predefined rule includes at least wideband CSI of baseline sub-configuration has highest priority. For example, predefined rule includes at least CSI of baseline sub-configuration has higher priority than corresponding CSI of another sub-configuration. For example, predefined rule includes at least CSI of a sub-configuration with lower index has higher priority than corresponding CSI of another sub-configuration with higher index. For example, predefined rule includes at least wideband CSI of a sub-configuration has higher priority than subband CSI of the sub-configuration. For example, Pri3=A+C (sub-configuration index) , or Pri3=B*D+A+C, or Pri3=B*E+A+C.
[0169] The information A may have higher priority than information B ifPri3 of information A is smaller than the Pri3 of information B as shown in Table 19. Part 2 may be split into 3 groups with different priorities. This includes sub-priorities for each group / or priority level for dropping certain parameters based on these priorities.
[0170] Table 19: Example priority information.
[0171] When omitting Part 2 CSI information for a particular priority level, the UE may omit all of the information at that priority level. If a CSI report n is configured with M+1 active sub-configurations, the CSI report includes priority 2*n+1, 2*n+2, ..., 2*n+M. The priority 0 includes CSI of baseline sub-configuration of the CSI report, and CSI of other sub-configurations of the CSI report is in priority 2*n+1, 2*n+2, ..., 2*n+M, respectively.
[0172] In some embodiments, the mapping order method or dropping method are determined according to at least one of the following: high layer signaling, CSI report configuration, CSI-RS resource configuration, UE capability. For example, a high layer signaling indicates how to map the CSI parameters of multi-CSI report. For example, a high layer signaling indicates which mapping method is used for the CSI parameters of multi-CSI report. For example, a CSI-ReportConfig can be configured with multiple sub-configurations, where each sub-configuration may be configured with at least one of RI restriction, codebook subset restriction and / or port subset indication, and the CSI in the CSI report using a first mapping order method. A CSI-ReportConfig can be configured with multiple sub-configurations, each sub-configuration may be configured with at least a CSI-RS resource list, and the CSI in the CSI report using a second mapping order. For example, a CSI-ReportConfig may be configured with multiple sub-configurations. Each sub-configuration may configured with at least one of RI restriction, codebook subset restriction, and / or port subset indication using a first dropping method. A CSI-ReportConfig can be configured with multiple sub-configurations, each sub-configuration may be configured with at least a CSI-RS resource list using a second dropping method.
[0173] Bitwidth
[0174] Each CSI parameter may have several bits, so bitwidth may need to be defined. In some embodiments, the bitwidth of CRI of a sub-configuration#i for a multi-CSIs report is determined according to at least one of the following: the number of CSI-RS resources associate with the sub-configuration#i, the number of all CSI-RS resources associate with the CSI report in corresponding resource set, the number of CSI-RS resources associate with the activated baseline sub-configurations, the number of CSI-RS resources associate with the baseline sub-configurations, the number of all CSI-RS resources associate with the activated sub-configurations. In some embodiments, for each sub-configuration, the bitwidth of CRI for a multi-CSIs report is determined as is the number of CSI-RS resources associated with the sub-configuration#i in corresponding resource set. In some embodiments, a CRI k1 (k1≥0) corresponds to the activated (k1+1) -th entry of the associated resource of the sub-configuration in the corresponding CSI-RS Resource Set for channel measurement shown in Table 20.
[0175] Table 20: Example bitwidth distribution.
[0176] In some embodiments, a CRI k1 (k1≥0) corresponds to the activated (O+k1+1) -th entry of the associated resource in the corresponding CSI-RS Resource Set for channel measurement. O is the number of resources of the active sub-configurations with a lower index than the sub-configuration.
[0177] Table 21: Example bitwidth distribution.
[0178] In some embodiments, for each sub-configuration, the bitwidth of CRI for a multi-CSI report is determined as is the number of CSI-RS resources associated with the CSI report in a corresponding resource set. In some embodiments, a CRI k1 (k1≥0) corresponds to the activated (k1+1) -th entry of the associated resource in the corresponding CSI-RS Resource Set for channel measurement.
[0179] Table 22: Example bitwidth distribution.
[0180] In some embodiments, for each sub-configuration, the bitwidth of CRI for a multi-CSI report is determined as KCSI-RS isthenumberof CSI-RSresources associated with the activated sub-configurations of the CSI report in corresponding resource set. In some embodiments, a CRI k1 (k1≥0) corresponds to the activated (k1+1) -th entry of the associated resource of the activated sub-configurations of CSI report in the corresponding CSI-RS Resource Set for channel measurement.
[0181] Table 23: Example bitwidth distribution.
[0182] In some embodiments, for each sub-configuration, the sub-configuration is associated with all the CSI-RS resources configured in a CSI-RS resource set associated with the CSI report, the bitwidth of CRI is determined as KCSI-RS is the number of all the CSI-RS resources in a corresponding resource set.
[0183] In some embodiments, for each sub-configuration, the bitwidth of CRI for a multi-CSI report is determined as KCSI-RS is the number of CSI-RS resources associated with the activated baseline sub-configurations of the CSI report in a corresponding resource set, which may mean that the bitwidth of CRI for all sub-configurations are same.
[0184] In some embodiments, for each sub-configuration, the bitwidth of RI for a multi-CSI report is determined as nRI is the number of allowed rank indicator value for the sub-configuration, which may mean that the bitwidth of RI for different sub-configuration may be different. In some embodiments, for each sub-configuration, the bitwidth of RI for a multi-CSI report is determined as nRI is the number of allowed rank indicator value for baseline sub-configuration, which may mean that the bitwidth of RI for different sub-configuration are same.
[0185] The bitwidth of common CRI is according to the number of resources associated with a baseline sub-configuration. For example, the bitwidth of common CRI for is determined as KCSI-RS is the number of resources associated with a baseline sub-configuration. The bitwidth of common RI is according to the number of allowed rank indicator value for a baseline sub-configuration. For example, the bitwidth of RI is determined as nRI is the number of allowed rank indicator value for a baseline sub-configuration. The bitwidth of common LI is according to the rank value of baseline sub-configuration. For example where v is the rank value of baseline sub-configuration. The bitwidth of common PMi is according to the N1, N2, O1, O2 of baseline sub-configuration. N1, N2 is number of antenna ports in first (n1) and second (n2) dimension. O1, O2 may be parameters used for calculate PMI. The bitwidth of worst layer indication, or valid column indication is according to the rank value reported by the baseline sub-configuration or the number of columns of precoding matrix indicated by the common PMI. For example the bitwidth is same as the rank value reported by the baseline sub-configuration. For another example, the bitwidth is v is the rank value reported by the baseline sub-configuration.
[0186] In some embodiments, for a CSI-ReportConfig configured with multiple sub-configurations, and each sub-configuration may configured with at least a CSI-RS resource list, the number of CSI-RS resource in each CSI-RS resource list associated with a sub-configuration may be the same.
[0187] For a aperiodic CSI report and the CSI reporting corresponding to N indicated sub-configurations from L sub-configurations in a CSI report, for the case without CSI payload reduction (overhead reduction) , where is the total number of CSI-RS resources corresponding to i-th sub-configuration out of the N indicated sub-configurations in the CSI-RS resource set for channel measurement. The i-th sub-configuration out of the N indicated sub-configurations is the sub-configuration with i-th index in the descending / ascending order of index values among the N indicated sub-configurations.
[0188] The system and process described above may be encoded in a signal bearing medium, a computer readable medium such as a memory, programmed within a device such as one or more integrated circuits, one or more processors or processed by a controller or a computer. That data may be analyzed in a computer system and used to generate a spectrum. If the methods are performed by software, the software may reside in a memory resident to or interfaced to a storage device, synchronizer, a communication interface, or non-volatile or volatile memory in communication with a transmitter. A circuit or electronic device designed to send data to another location. The memory may include an ordered listing of executable instructions for implementing logical functions. A logical function or any system element described may be implemented through optic circuitry, digital circuitry, through source code, through analog circuitry, through an analog source such as an analog electrical, audio, or video signal or a combination. The software may be embodied in any computer-readable or signal-bearing medium, for use by, or in connection with an instruction executable system, apparatus, or device. Such a system may include a computer-based system, a processor-containing system, or another system that may selectively fetch instructions from an instruction executable system, apparatus, or device that may also execute instructions.
[0189] A“computer-readable medium, ” “machine readable medium, ” “propagated-signal” medium, and / or “signal-bearing medium” may comprise any device that includes stores, communicates, propagates, or transports software for use by or in connection with an instruction executable system, apparatus, or device. The machine-readable medium may selectively be, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. A non-exhaustive list of examples of a machine-readable medium would include: an electrical connection “electronic” having one or more wires, a portable magnetic or optical disk, a volatile memory such as a Random Access Memory “RAM” , a Read-Only Memory “ROM” , an Erasable Programmable Read-Only Memory (EPROM or Flash memory) , or an optical fiber. A machine-readable medium may also include a tangible medium upon which software is printed, as the software may be electronically stored as an image or in another format (e.g., through an optical scan) , then compiled, and / or interpreted or otherwise processed. The processed medium may then be stored in a computer and / or machine memory.
[0190] The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of the various embodiments. The illustrations are not intended to serve as a complete description of all of the elements and features of apparatus and systems that utilize the structures or methods described herein. Many other embodiments may be apparent to those of skill in the art upon reviewing the disclosure. Other embodiments may be utilized and derived from the disclosure, such that structural and logical substitutions and changes may be made without departing from the scope of the disclosure. Additionally, the illustrations are merely representational and may not be drawn to scale. Certain proportions within the illustrations may be exaggerated, while other proportions may be minimized. Accordingly, the disclosure and the figures are to be regarded as illustrative rather than restrictive.
[0191] One or more embodiments of the disclosure may be referred to herein, individually and / or collectively, by the term “invention” merely for convenience and without intending to voluntarily limit the scope of this application to any particular invention or inventive concept. Moreover, although specific embodiments have been illustrated and described herein, it should be appreciated that any subsequent arrangement designed to achieve the same or similar purpose may be substituted for the specific embodiments shown. This disclosure is intended to cover any and all subsequent adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those of skill in the art upon reviewing the description.
[0192] The phrase "coupled with" is defined to mean directly connected to or indirectly connected through one or more intermediate components. Such intermediate components may include both hardware and software based components. Variations in the arrangement and type of the components may be made without departing from the spirit or scope of the claims as set forth herein. Additional, different or fewer components may be provided.
[0193] The above disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description. While various embodiments of the invention have been described, it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the invention. Accordingly, the invention is not to be restricted except in light of the attached claims and their equivalents.
Claims
1.A method for wireless communication comprising:receiving a radio resource control (RRC) signal with a configuration for a channel state information (CSI) report, the CSI report configuration comprising one or more sub-configurations, wherein the CSI report configuration is associated with a resource setting;determining a mapping order of CSI for the CSI report; andtransmitting the CSI report based on the mapping order and based on the CSI report configuration.2.The method of claim 1, wherein the receiving, the determining and the transmitting is by a user equipment (UE) that transmits the CSI report to a basestation.3.The method of claim 1, wherein the mapping order is determined based on at least one of a high layer signaling, a CSI report configuration, a CSI-RS resource configuration, or a user equipment (UE) capability.4.The method of claim 3, wherein the mapping order is determined based on at least a CSI report configuration, wherein the CSI report configuration using a first mapping order when configured with multiple sub-configurations, and each sub-configuration is configured with at least one of a rank indicator (RI) restriction, a codebook subset restriction, or a port subset indication, further wherein the CSI report configuration using a second mapping order when configured with multiple sub-configurations, and each sub-configuration is configured with at least a CSI-RS resource list.5.The method of claim 4, wherein the first mapping order is based on a CSI parameter first and a sub-configuration index second, and the second mapping order is based on the sub-configuration index first and the CSI parameter second.6.The method of claim 1, wherein the CSI in the CSI report are transmitted in multiple parts based on a channel type, a frequency granularity type, or a number of the sub-configurations.7.The method of claim 6, wherein when the channel type comprises a physical uplink control channel ( “PUCCH” ) , the frequency granularity type comprises a Type 1 CSI with wideband frequency granularity, and the number of sub-configurations is less than a first threshold value, then the CSI report is not transmitted in multiple parts.8.The method of claim 1, wherein the CSI report is not transmitted in multiple parts, a first kind CSI parameters of all sub-configurations are mapping according to CSI parameter first and sub-configuration index second, and a second kind CSI parameters of all sub-configurations are mapped according to the sub-configuration index first and the CSI parameters second.9.The method of claim 8, wherein the second kind CSI parameters are mapped behind the first kind of CSI parameters in CSI report.10.The method of claim 8, wherein the first kind CSI parameters includes at least one of a CSI reference signal resource indicator (CRI) , a rank indicator (RI) , or a layer indicator (LI) , and the second kind CSI parameters includes at least one of pre-coding matrix indicator (PMI) , CRI, LI, or RI.11.The method of claim 8, wherein the CSI parameters comprise subband CSI parameters that are mapped behind other CSI parameters in the mapping order.12.The method of claim 11, wherein the mapping order of CSI parameters in subband CSI parameters are mapped according to map subband differential CQI for a second transport block (TB) for all subbands with increasing order of subband number first and map PMI subband information for all subbands with increasing order of subband number second.13.The method of claim 1, wherein the CSI report comprises at least one of a common pre-coding matrix indicator (PMI) , a common CSI reference signal resource indicator (CRI) , a common rank indicator (RI) , a common layer indicator (LI) , a sub-configuration differential CQI, a sub-configuration differential RI, or a joint RI.14.The method of claim 13, wherein when the CSI report comprises at least one of the common CRI, the common RI, the common LI, the common PMI, or the joint RI, they are mapped first, and other CSI parameters of the sub-configurations are subsequent.15.The method of claim 13, wherein when the CSI report comprises at least one of the common CRI, the common RI, the common LI, the common PMI, or the joint RI, the at least one of common CRI, the common RI, the common LI, the common PMI, or the joint RI, are mapped together with other CSI parameters of a baseline sub-configuration and all the CSI parameters are mapped according to a legacy mapping order.16.The method of claim 13, wherein when the CSI report comprises at least one of a sub-configuration differential CQI, or a sub-configuration differential RI, each of the at least one of sub-configuration differential CQI, or the sub-configuration differential RI, for a sub-configuration, if available, are mapped together with other CSI parameters of the sub-configuration and all the CSI parameters are mapped according to a legacy mapping order.17.The method of claim 1, wherein a bitwidth of CRI of the sub-configuration for the CSI report is determined based on one of a number of CSI reference signals (CSI-RS) resources associated with the sub-configuration, a number of all CSI-RS resources associated with the CSI report in a corresponding resource set, a number of CSI-RS resources associated with an activated baseline of the sub-configuration, or a number of all CSI-RS resources associate with the activated sub-configurations.18.The method of claim 1, wherein when the CSI report is transmitted in multiple parts, a portion of a Part 2 CSI parameters are omitted according to a priority order, wherein the CSI parameters in Part 2 are divided into three priority orders, and when omitting Part 2 CSI parameters for a particular priority level, the parameters are omitted according to a sub-priority level when the CSI report is configured with one or more sub-configurations or includes multi-CSIs report.19.The method of claim 18, the sub-priority level is determined according to at least one of the following a sub-configuration index, a number of sub-configurations at the priority level (D) , a number of sub-configurations for the CSI report (E) , a first indicator (A) , a second indicator (B) , or a third indicator (C) .20.A method for wireless communication comprising:transmitting a signal with a configuration for a channel state information (CSI) report, the CSI report configuration comprising one or more sub-configurations; andreceiving the CSI report based on the CSI report configuration and based on a mapping order.21.The method of claim 20, wherein the transmitting is by a basestation to a user equipment (UE) and the receiving the CSI report is received at the basestation from the UE.22.The method of claim 20, wherein the mapping order is determined based on at least one of a high layer signaling, a CSI report configuration, a CSI-RS resource configuration, or a user equipment (UE) capability.23.The method of claim 22, wherein the mapping order is determined based on at least a CSI report configuration, wherein the CSI report using a first mapping order when configured with multiple sub-configurations, and each sub-configuration is configured with at least one of a rank indicator (RI) restriction, a codebook subset restriction, or a port subset indication, further wherein the CSI report using a second mapping order when configured with multiple sub-configurations, and each sub-configuration is configured with at least a CSI-RS resource list.24.The method of claim 23, wherein the first mapping order is based on a CSI parameter first and a sub-configuration index second, and the second mapping order is based on the sub-configuration index first and the CSI parameter second.25.The method of claim 20, wherein the CSI in the CSI report are transmitted in multiple parts based on a channel type, a frequency granularity type, or a number of the sub-configurations.26.The method of claim 25, wherein when the channel type comprises a physical uplink control channel ( “PUCCH” ) , the frequency granularity type comprises a Type 1 CSI with wideband frequency granularity, and the number of sub-configurations is less than a first threshold value, then the CSI report is not transmitted in multiple parts.27.The method of claim 20, wherein the CSI report is not transmitted in multiple parts, a first kind CSI parameters of all sub-configurations are mapping according to CSI parameter first and sub-configuration index second, and a second kind CSI parameters of all sub-configurations are mapped according to the sub-configuration index first and the CSI parameters second.28.The method of claim 27, wherein the second kind CSI parameters are mapped behind the first kind of CSI parameters in CSI report.29.The method of claim 27, wherein the first kind CSI parameters includes at least one of a CSI reference signal resource indicator (CRI) , a rank indicator (RI) , or a layer indicator (LI) , and the second kind CSI parameters includes at least one of pre-coding matrix indicator (PMI) , CRI, LI, or RI.30.The method of claim 27, wherein the CSI parameters comprise subband CSI parameters that are later in the mapping order.31.The method of claim 30, wherein the mapping order of CSI parameters in subband CSI parameters are mapped according to map subband differential CQI for a second transport block (TB) for all subbands with increasing order of subband number first and map PMI subband information for all subbands with increasing order of subband number second.32.The method of claim 20, wherein the CSI report comprises at least one of a common pre-coding matrix indicator (PMI) , a common CSI reference signal resource indicator (CRI) , a common rank indicator (RI) , a common layer indicator (LI) , a sub-configuration differential CQI, a sub-configuration differential RI, or a joint RI.33.The method of claim 32, wherein when the CSI report comprises at least one of the common CRI, the common RI, the common LI, the common PMI, or the joint RI, they are mapped first, and other CSI parameters of the sub-configurations are subsequent.34.The method of claim 32, wherein when the CSI report comprises at least one of the common CRI, the common RI, the common LI, the common PMI, or the joint RI, the at least one of the common CRI, the common RI, the common LI, the common PMI, or the joint RI, are mapped together with other CSI parameters of a baseline sub-configuration and all the CSI parameters are mapped according to a legacy mapping order.35.The method of claim 32, wherein when the CSI report comprises at least one of a sub-configuration differential CQI, or a sub-configuration differential RI, each of the at least one of sub-configuration differential CQI, or the sub-configuration differential RI, for a sub-configuration, if available, are mapped together with other CSI parameters of the sub-configuration and all the CSI parameters are mapped according to a legacy mapping order.36.The method of claim 20, wherein a bitwidth of CRI of the sub-configuration for the CSI report is determined based on one of a number of CSI reference signals (CSI-RS) resources associated with the sub-configuration, a number of all CSI-RS resources associated with the CSI report in a corresponding resource set, a number of CSI-RS resources associated with an activated baseline of the sub-configuration, or a number of all CSI-RS resources associate with the activated sub-configurations.37.The method of claim 20, wherein when the CSI report is transmitted in multiple parts, a portion of a Part 2 CSI parameters are omitted according to a priority order, wherein the CSI parameters in Part 2 are divided into three priority orders, and when omitting Part 2 CSI parameters for a particular priority level, the parameters are omitted according to a sub-priority level when the CSI report is configured with one or more sub-configurations or includes multi-CSIs report.38.The method of claim 37, the sub-priority level is determined according to at least one of the following a sub-configuration index, a number of sub-configurations at the priority level (D) , a number of sub-configurations for the CSI report (E) , a first indicator (A) , a second indicator (B) , or a third indicator (C) .39.A wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement a method recited in any of claims 1 to 38.40.A computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement a method recited in any of claims 1 to 38.