Methods for PMI, RI, and port indexing for CSI targeting multiple transmitter-receiver points

Abstract

This disclosure provides techniques for channel state information (CSI) reporting in multi-transmitter receiver point (mTRP) scenarios.

Description

Technical Field

[0001] Various aspects of this disclosure relate to wireless communication, and more specifically, various aspects of this disclosure relate to techniques for determining channel state information for multiple transmitter-receiver points utilizing resources in different frequency domains. Background Technology

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. These wireless communication systems can employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the improved LTE (LTE-A) system, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0003] In some examples, a radio multiple access communication system may include multiple base stations (BSs), each capable of simultaneously supporting communication with multiple communication devices (also referred to as user equipment (UE)). In LTE or LTE-A networks, a set of one or more base stations may define an evolved Node B (eNB). In other examples (e.g., in next-generation, new radio (NR), or 5G networks), a radio multiple access communication system may include multiple distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmit / receive points (TRPs), etc.) communicating with multiple central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein a set of one or more DUs communicating with a CU may define an access node (e.g., which may be referred to as a BS, a 5G NB, a next-generation Node B (gNB or gNodeB), a transmit / receive point (TRP), etc.). The BS or DU can communicate with the UE set on both downlink channels (e.g., for transmissions from the BS or DU to the UE) and uplink channels (e.g., for transmissions from the UE to the BS or DU).

[0004] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the city, country, region, and even global levels. NR (e.g., New Radio or 5G) is an example of an emerging telecommunications standard. NR is a set of enhancements to the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using OFDMA with a cyclic prefix (CP) on the downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0005] However, with the continued growth in demand for mobile broadband access, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunications standards that employ these technologies. Summary of the Invention

[0006] The systems, methods, and apparatuses of this disclosure have several aspects, none of which are solely responsible for their desired properties. Without limiting the scope of this disclosure as set forth in the following claims, some features will now be briefly discussed. Upon consideration of this discussion, and especially after reading the section entitled "Detailed Description," it will be understood how the features of this disclosure provide advantages, including improved communication between access points and stations in a wireless network.

[0007] Some aspects provide a method for wireless communication by a user equipment (UE). In general, the method includes: receiving a Channel State Information (CSI) report configuration from a network entity, the CSI report configuration indicating at least first and second CSI Reference Signal (CSI-RS) resource or port groups associated with the CSI report; performing CSI measurements based on a Frequency Division Multiplexing (FDM) scheme, the FDM scheme including transmission over a first FD unit set via a first resource or port group and transmission over a second FD unit set via a second resource or port group; and sending a Precoding Matrix Indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with ports in the first resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD unit set.

[0008] Some aspects provide a method for wireless communication by a network entity. In general, the method includes: sending a Channel State Information (CSI) report configuration to a User Equipment (UE), the CSI report configuration indicating at least first and second CSI Reference Signal (CSI-RS) resource or port groups associated with the CSI report; transmitting the CSI-RS based on a Frequency Division Multiplexing (FDM) scheme, the FDM scheme including transmission over a first FD unit set via a first resource or port group and transmission over a second FD unit set via a second resource or port group; and receiving a Precoding Matrix Indicator (PMI) report from the UE, the PMI report indicating a first set of one or more PMIs associated with ports in the first resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD unit set.

[0009] Some aspects provide a method for wireless communication by a user equipment (UE). In general, the method includes: determining a transmission scheme for reporting CSI using at least first and second Channel State Information (CSI) Reference Signal (CSI-RS) resources or port groups; performing CSI measurements based on CSI-RS transmissions transmitted via at least the first and second CSI-RS resources or port groups; and sending a Precoding Matrix Indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with the first resource or port group, a second set of one or more PMIs associated with the second resource or port group, a first Layer Indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set.

[0010] Some aspects provide a method for wireless communication by a network entity. In general, the method includes: transmitting a CSI-RS to a user equipment (UE) according to a transmission scheme using at least first and second Channel State Information (CSI) Reference Signal (CSI-RS) resources or port groups; and receiving a precoding matrix indicator (PMI) report from the UE, the PMI report indicating a first set of one or more PMIs associated with the first resource or port group, a second set of one or more PMIs associated with the second resource or port group, a first layer indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set.

[0011] Some aspects provide a method for wireless communication by a user equipment (UE). In general, the method includes: receiving a channel state information (CSI) report configuration from a network entity, the configuration indicating at least one CSI-RS resource including at least first and second CSI reference signal (CSI-RS) port groups; determining a CSI codebook associated with each CSI-RS port for precoding matrix indicator (PMI) and channel quality indicator (CQI) measurements; and performing PMI and CQI measurements using the determined CSI codebook with CSI-RS port indices in the respective CSI-RS port groups, and reporting a first PMI mapped to a port index in the first group and a second PMI mapped to a port index in the second group.

[0012] Some aspects provide a method for wireless communication by a network entity. In general, the method includes: sending a Channel State Information (CSI) report configuration to a User Equipment (UE), the CSI report configuration indicating at least one CSI-RS resource including at least first and second CSI Reference Signal (CSI-RS) port groups; determining a CSI codebook associated with each CSI-RS port for Precoding Matrix Indicator (PMI) and Channel Quality Indicator (CQI) measurements; and receiving from the UE a report of a first PMI mapped to a port index in the first group and a second PMI mapped to a port index in the second group, the report being based on PMI and CQI measurements performed by the UE using the determined CSI codebook with the CSI-RS port index in the respective CSI-RS port group.

[0013] Some aspects provide units, apparatuses and / or computer-readable media having computer-executable code stored thereon for performing the techniques described herein for processing multiple TRP transfers.

[0014] To achieve the foregoing and related objectives, one or more aspects include the features fully described below and specifically pointed out in the claims. The following description and drawings set forth certain illustrative features of one or more aspects in detail. However, these feature indications can be adopted in only a few of the various ways in which the principles of each aspect apply. Attached Figure Description

[0015] To gain a more detailed understanding of the features described above, reference can be made to various aspects (briefly outlined above), some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not intended to limit its scope, as the description may allow for other equally valid aspects.

[0016] Figure 1 This is a block diagram conceptually illustrating certain aspects of an example telecommunications system based on this disclosure.

[0017] Figure 2 This is a block diagram illustrating an example logical architecture of a distributed radio access network (RAN) according to certain aspects of this disclosure.

[0018] Figure 3 This is a diagram illustrating an example physical architecture of a distributed RAN according to certain aspects of this disclosure.

[0019] Figure 4 This is a block diagram conceptually illustrating the design of an example base station (BS) and user equipment (UE) according to certain aspects of this disclosure.

[0020] Figure 5 Example frames and subframe formats are shown in accordance with certain aspects of this disclosure.

[0021] Figure 6 and Figure 7 Examples of single DCI and multiple DCI multiple TRP scenarios are shown in accordance with certain aspects of this disclosure.

[0022] Figure 8 Example resource mappings for an mTRP scenario are shown, based on certain aspects of this disclosure.

[0023] Figure 9 Examples of transport block (TB) determination, redundant version (RV), and resource element (RE) mapping according to certain aspects of this disclosure are shown.

[0024] Figure 10 and Figure 11 Examples of repetition within a time slot and across time slots, respectively, are shown for certain aspects of this disclosure.

[0025] Figure 12 Example mTRP CSI categories are shown in accordance with certain aspects of this disclosure.

[0026] Figure 13 Example operations for wireless communication by a user equipment (UE) in accordance with certain aspects of this disclosure are shown.

[0027] Figure 14 Example operations for wireless communication by a network entity are shown in accordance with certain aspects of this disclosure.

[0028] Figure 15 An example of a PMI report for an FDM scheme is shown, based on certain aspects of this disclosure.

[0029] Figure 16 Example operations for wireless communication by a user equipment (UE) in accordance with certain aspects of this disclosure are shown.

[0030] Figure 17 Example operations for wireless communication by a network entity are shown in accordance with certain aspects of this disclosure.

[0031] Figure 18 Example operations for wireless communication by a user equipment (UE) in accordance with certain aspects of this disclosure are shown.

[0032] Figure 19 Example operations for wireless communication by a network entity are shown in accordance with certain aspects of this disclosure.

[0033] Figure 20A -C illustrates an example of PMI and CQI measurements using the CSI-RS port index, based on certain aspects of this disclosure.

[0034] Figure 21 An apparatus having example components capable of performing operations according to certain aspects of this disclosure is shown.

[0035] To aid understanding, the same reference numerals have been used where possible to designate common elements for the purposes of the figures. It is intended that elements disclosed in one aspect can be usefully applied to other aspects without requiring specific description. Detailed Implementation

[0036] Various aspects of this disclosure relate to wireless communications, and more specifically, various aspects of this disclosure relate to techniques for reporting channel state information (CSI) (such as precoding matrix indicators (PMI) and layer indicators (LI)) in multi-transmitter receiver point (mTRP) scenarios.

[0037] In some cases, the UE can perform mTRP CSI measurements based on a Frequency Division Multiplexing (FDM) scheme, which includes transmissions over a first set of FD cells via a first resource or port group and transmissions over a second set of FD cells via a second resource or port group. The UE can send a PMI report indicating a first set of one or more PMIs associated with ports in the first resource or port group on the first FD cell set and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD cell set.

[0038] In some cases, the UE can perform mTRP CSI measurements based on CSI-RS transmissions sent via at least first and second CSI-RS resource or port groups. The UE can send a PMI report indicating a first set of one or more PMIs associated with the first resource or port group, a second set of one or more PMIs associated with the second resource or port group, a first layer indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set.

[0039] In some cases, the UE can determine the CSI codebook associated with each CSI-RS port used for PMI and Channel Quality Indicator (CQI) measurements. The UE can use the CSI-RS port index in the corresponding CSI-RS port group, perform PMI and CQI measurements using the determined CSI codebook, and report the first PMI mapped to the port index in the first group and the second PMI mapped to the port index in the second group.

[0040] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of the elements discussed without departing from the scope of this disclosure. Various processes or components may be omitted, substituted, or added as appropriate in the examples. For example, the described method may be performed in a different order than that described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined with those in other examples. For example, an apparatus or a method may be implemented using any number of aspects set forth herein. Moreover, the scope of this disclosure is intended to cover such apparatuses or methods implemented using structures, functions, or structures and functions other than or different from those aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims. The term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects.

[0041] The technologies described herein can be used in various wireless communication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other networks. The terms "network" and "system" are often used interchangeably. CDMA networks can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 encompasses the IS-2000, IS-95, and IS-856 standards. TDMA networks can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS).

[0042] New Radio (NR) is an emerging wireless communication technology under development, integrated with the 5G Technology Forum (5GTF). 3GPP Long Term Evolution (LTE) and Improved LTE (LTE-A) are versions of UMTS using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). The technologies described herein can be used with the aforementioned wireless network and radio technologies, as well as other wireless network and radio technologies. For clarity, while this document may use terms commonly associated with 3G and / or 4G wireless technologies to describe aspects, aspects of this disclosure can be applied to communication systems based on other generations (e.g., 5G and later technologies, including NR technology).

[0043] New radio (NR) access (e.g., 5G technology) can support a variety of wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or above), millimeter wave (mmW) targeting high carrier frequencies (e.g., 25 GHz or above), massive machine-type communication (mMTC) targeting non-backward-compatible MTC technologies, and / or mission-critical ultra-reliable low-latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. Furthermore, these services can coexist in the same subframe.

[0044] Example wireless communication system

[0045] Figure 1 An example wireless communication network 100 is shown in which aspects of this disclosure can be implemented. For example, network 100 may include one or more UEs 120 configured to perform... Figure 13 Operation 1300 Figure 16 Operation 1600 and / or Figure 18 Operation 1800 is used to measure and report mTRP CSI. Similarly, network 100 may include one or more base stations (BS) 110 configured to perform... Figure 14 Operation 1400 Figure 17 Operation 1700 and / or Figure 19 Operation 1900, to receive and process data from (executor) Figure 13 Operation 1300 Figure 16 Operation 1600 and / or Figure 18 The operation of UE 120 reported the mTRP CSI.

[0046] like Figure 1 As shown, the wireless network 100 may include multiple base stations (BS) 110 and other network entities. A BS may be a station communicating with a user equipment (UE). Each BS 110 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a Node B (NB) and / or the NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the term "cell" is interchangeable with Next Generation Node B (gNB or gNodeB), NR BS, 5G NB, Access Point (AP), and Transmit / Receive Point (TRP). In some examples, a cell may not be stationary, and the geographic area of ​​the cell may move depending on the location of a mobile BS. In some examples, base stations may interconnect with each other and / or with one or more other base stations or network nodes (not shown) in the wireless communication network 100 via various types of backhaul interfaces (e.g., direct physical connection, wireless connection, virtual network, or interface using any suitable transport network).

[0047] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific Radio Access Technology (RAT) and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks with different RATs. In some cases, NR or 5GRAT networks can be deployed.

[0048] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with service subscriptions. A picocell can cover a relatively small geographic area and allow unrestricted access by UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a residential area) and allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in a residential area, etc.). A BS used for macrocells can be called a macro BS. A BS used for picocells can be called a pico BS. A BS used for femtocells can be called a femto BS or a home BS. Figure 1 In the examples shown, BS110a, 110b, and 110c can be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS110x can be a pico BS for pico cell 102x. BS110y and 110z can be femto BSs for femto cells 102y and 102z, respectively. A BS can support one or more (e.g., three) cells.

[0049] The wireless communication network 100 may also include relay stations. A relay station is a station that receives data transmissions and / or other information from an upstream station (e.g., a BS or a UE) and transmits the data transmissions and / or other information to a downstream station (e.g., a UE or a BS). A relay station may also be a UE relaying transmissions for other UEs. Figure 1 In the example shown, relay station 110r can communicate with BS110a and UE 120r to facilitate communication between BS110a and UE 120r. A relay station can also be referred to as a relay BS, repeater, etc.

[0050] The wireless communication network 100 can be a heterogeneous network comprising different types of base stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, repeaters, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in the wireless communication network 100. For example, a macro BS can have a high transmit power level (e.g., 20 watts), while pico BSs, femto BSs, and repeaters can have lower transmit power levels (e.g., 1 watt).

[0051] The wireless communication network 100 can support synchronous or asynchronous operation. For synchronous operation, the base stations (BSs) can have similar frame timings, and transmissions from different BSs can be approximately time-aligned. For asynchronous operation, the BSs can have different frame timings, and transmissions from different BSs can be time-disaligned. The techniques described herein can be used for both synchronous and asynchronous operations.

[0052] Network controller 130 can be coupled to a group of base stations (BSs) and provide coordination and control for these BSs. Network controller 130 can communicate with BS 110 via backhaul. BS 110 can also communicate with each other via wireless or wired backhaul (e.g., directly or indirectly).

[0053] UE 120 (e.g., 120x, 120y, etc.) may be distributed throughout the wireless communication network 100, and each UE may be stationary or mobile. UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smartphone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical apparatus, biometric sensor / device, wearable device (e.g., smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio unit, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media. Some UEs can be considered Machine-Type Communication (MTC) devices or Evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or from a network, such as a wide area network (e.g., the Internet or cellular networks), via wired or wireless communication links. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0054] Some wireless networks (e.g., LTE) utilize Orthogonal Frequency Division Multiplexing (OFDM) on the downlink and Single-Carrier Frequency Division Multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, often referred to as tones, frequency bands, etc. Data can be used to modulate each subcarrier. Typically, modulation symbols are transmitted using OFDM in the frequency domain and SC-FDM in the time domain. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing could be 15 kHz, and the minimum resource allocation (called a "resource block" (RB)) could be 12 subcarriers (or 180 kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, the nominal Fast Fourier Transform (FFT) size could be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband can cover 1.08MHz (i.e., 6 resource blocks), and there can be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20MHz, respectively.

[0055] While the aspects of the examples described herein can be associated with LTE technology, aspects of this disclosure can be applied with other wireless communication systems, such as NR. NR can utilize OFDM with CP on both the uplink and downlink, and can include support for half-duplex operation using TDD. Beamforming can be supported, and beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas, with up to 8 streams in multi-layer DL transmission and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE can be supported. Aggregation of multiple cells with up to 8 serving cells can be supported.

[0056] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and apparatuses within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, the subordinate entity utilizes the resources allocated by the scheduling entity. A base station is not the only entity that can be used as a scheduling entity. In some examples, a UE can act as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs can utilize the resources scheduled by that UE for wireless communication. In some examples, a UE can act as a scheduling entity in peer-to-peer (P2P) networks and / or mesh networks. In mesh network examples, in addition to communicating with a scheduling entity, UEs can also communicate directly with each other.

[0057] exist Figure 1 In the diagram, a solid line with a double arrow indicates the desired transmission between the UE and the serving BS, which is designated to serve the UE on the downlink and / or uplink. A thin dashed line with a double arrow indicates interference transmission between the UE and the BS.

[0058] Figure 2 It shows that it can be used Figure 1 The diagram illustrates an example logical architecture of a distributed radio access network (RAN) 200 implemented in a wireless communication network 100. A 5G access node 206 may include an access node controller (ANC) 202. The ANC 202 may be the central unit (CU) of the distributed RAN 200. Backhaul interfaces to the next-generation core network (NG-CN) 204 may terminate at the ANC 202. Backhaul interfaces to adjacent next-generation access nodes (NG-AN) 210 may also terminate at the ANC 202. The ANC 202 may include one or more TRPs 208 (e.g., cell, BS, gNB, etc.).

[0059] TRP 208 can be a distributed unit (DU). TRP 208 can connect to a single ANC (e.g., ANC 202) or more ANCs (not shown). For example, for RAN sharing, Radio as a Service (RaaS), and service-specific AND deployments, TRP 208 can connect to more than one ANC. TRP 208 can each include one or more antenna ports. TRP 208 can be configured to provide services to the UE individually (e.g., dynamically selected) or jointly (e.g., jointly transmitted).

[0060] The logical architecture of the distributed RAN 200 can support fronthaul schemes across different deployment types. For example, the logical architecture can be based on transmitting network capabilities (e.g., bandwidth, latency, and / or jitter).

[0061] The logical architecture of the distributed RAN 200 can share features and / or components with LTE. For example, the next-generation access node (NG-AN) 210 can support dual connectivity with NR and can share common fronthaul for LTE and NR.

[0062] The logical architecture of the distributed RAN 200 enables collaboration between pairs of TRPs 208 and between multiple TRPs (e.g., within a TRP and / or across TRPs via ANC 202). Inter-TRP interfaces can be omitted.

[0063] Logical functions can be dynamically distributed across the logical architecture of the distributed RAN 200. (Refer to...) Figure 5 In more detail, the Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Media Access Control (MAC) layer, and Physical (PHY) layer can be adapted to be placed at the DU (e.g., TRP 208) or CU (e.g., ANC 202).

[0064] Figure 3 An example physical architecture of a distributed RAN 300 according to various aspects of this disclosure is shown. A centralized core network unit (C-CU) 302 can manage core network functions. The C-CU 302 can be deployed centrally. C-CU 302 functions can be offloaded (e.g., to Advanced Wireless Services (AWS)) to handle peak capacity.

[0065] The centralized RAN unit (C-RU) 304 can manage one or more ANC functions. Optionally, the C-RU 304 can manage core network functions locally. The C-RU 304 can be deployed in a distributed manner. The C-RU 304 can be located close to the network edge.

[0066] The DU 306 can manage one or more TRPs (Edge Nodes (EN), Edge Units (EU), Radio Headers (RH), Smart Radio Headers (SRH), etc.). The DU can be located at the edge of a network with radio frequency (RF) capabilities.

[0067] Figure 4 The BS110 and UE 120 are shown (as in...) Figure 1The example components (described herein) can be used to implement various aspects of this disclosure. For example, antenna 452, processors 466, 458, 464, and / or controller / processor 480 of UE 120 can perform (or be used to perform) these functions. Figure 13 Operation 1300 Figure 16 Operation 1600 and / or Figure 18 Operation 1800. Similarly, the antenna 434, processors 420, 430, 438, and / or controller / processor 440 of the BS110 can perform (or be used to perform) these functions. Figure 14 Operation 1400 Figure 17 Operation 1700 and / or Figure 19 Operation 1900.

[0068] At BS110, the transmit processor 420 can receive data from data source 412 and control information from controller / processor 440. The control information can be used for the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Group Common PDCCH (GC PDCCH), etc. Data can be used for the Physical Downlink Shared Channel (PDSCH), etc. The processor 420 can process (e.g., encode and symbol map) the data and control information separately to obtain data symbols and control symbols. The processor 420 can also generate reference symbols, for example, for the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Cell-Specific Reference Signal (CRS). The transmit (TX) Multiple-Input Multiple-Output (MIMO) processor 430 can perform spatial processing (e.g., precoding, if applicable) on the data symbols, control symbols, and / or reference symbols, and can provide an output symbol stream to modulators (MODs) 432a to 432t. Each modulator 432 can (e.g., for OFDM, etc.) process the corresponding output symbol stream to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signal from modulators 432a to 432t can be transmitted via antennas 434a to 434t respectively.

[0069] At UE 120, antennas 452a to 452r can receive downlink signals from base station 110 and can provide the received signals to demodulators (DEMODs) 454a to 454r in the transceiver. Each demodulator 454 can adjust (e.g., filter, amplify, down-convert, and digitize) the corresponding received signal to obtain an input sample. Each demodulator can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 456 can obtain received symbols from all demodulators 454a to 454r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receiver processor 458 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to data sink 460, and provide decoded control information to controller / processor 480.

[0070] On the uplink, at UE 120, the transmitting processor 464 can receive and process data from data source 462 (e.g., for the Physical Uplink Shared Channel (PUSCH)) and control information from controller / processor 480 (e.g., for the Physical Uplink Control Channel (PUCCH)). The transmitting processor 464 can also generate reference symbols for reference signals (e.g., for Sounding Reference Signals (SRS)). Symbols from the transmitting processor 464 can be pre-encoded (if applicable) by TX MIMO processor 466, further processed by demodulators 454a to 454r in the transceiver (e.g., for SC-FDM, etc.), and transmitted to base station 110. At BS 110, the uplink signals from UE 120 can be received by antenna 434, processed by modulator 432, detected by MIMO detector 436 (if applicable), and further processed by receiving processor 438 to obtain decoded data and control information transmitted by UE 120. The receiver processor 438 can provide decoded data to the data sink 439 and decoded control information to the controller / processor 440.

[0071] Controllers / processors 440 and 480 can direct operations at BS110 and UE 120, respectively. Processor 440 and / or other processors and modules at base station 110 can execute or direct the execution of processes used in accordance with the techniques described herein. Memory 442 and 482 can store data and program code for BS110 and UE 120, respectively. Scheduler 444 can schedule UE for data transmission on downlink and / or uplink.

[0072] In LTE, the basic transmission time interval (TTI), or packet duration, is a 1ms subframe. In NR, the subframe is still 1ms, but the basic TTI is called a slot. A subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16... slots), depending on the subcarrier spacing. NR RBs are 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15kHz and can define other subcarrier spacings relative to the basic spacing, such as 30kHz, 60kHz, 120kHz, 240kHz, etc. Symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing.

[0073] Figure 5 This is a diagram illustrating an example of frame format 500 for NR. The transmission timeline for each of the downlink and uplink can be divided into units of radio frames. Each radio frame can have a predetermined duration (e.g., 10 ms) and can be divided into 10 subframes with indices 0 to 9, each subframe being 1 ms long. Each subframe can include a variable number of time slots, depending on the subcarrier spacing. Each time slot can include a variable number of symbol periods (e.g., 7 or 14 symbols), depending on the subcarrier spacing. Indices can be assigned to the symbol periods in each time slot. Micro-slots (which may be referred to as sub-slot structures) refer to transmission time intervals with a duration less than a time slot (e.g., 2, 3, or 4 symbols).

[0074] Each symbol in a time slot can indicate the link direction of data transmission (e.g., DL, UL, or flexible), and the link direction used for each subframe can be dynamically switched. The link direction can be based on the time slot format. Each time slot can include DL / UL data and DL / UL control information.

[0075] In NR, a synchronization signal (SS) block is transmitted. The SS block consists of the PSS, SSS, and two-symbol PBCH. This can be done at a fixed time slot location (e.g., as in...). Figure 5SS blocks are transmitted in symbols 0-3 shown in the diagram. PSS and SSS can be used by the UE for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identification. PBCH carries some basic system information, such as downlink system bandwidth, timing information within the radio frame, SS burst set period, system frame number, etc. SS blocks can be organized into SS bursts to support beam scanning. Additional system information, such as Residual Minimum System Information (RMSI), System Information Block (SIB), and Other System Information (OSI), can be transmitted on the Physical Downlink Shared Channel (PDSCH) in some subframes. For mmW, SS blocks can be transmitted up to sixty-four times, for example, using up to sixty-four different beam directions. Up to sixty-four transmissions of SS blocks are called SS burst sets. SS blocks in an SS burst set are transmitted in the same frequency region, while SS blocks in different SS burst sets can be transmitted at different frequency locations.

[0076] In some cases, two or more dependent entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communication can include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communication, Internet of Things (IoE) communication, IoT communication, mission-critical mesh networks, and / or various other suitable applications. Typically, a sidelink signal can refer to a signal transmitted from one dependent entity (e.g., UE1) to another dependent entity (e.g., UE2) without requiring relaying by a scheduling entity (e.g., UE or BS), even if the scheduling entity may be used for scheduling and / or control purposes. In some examples, licensed spectrum can be used to transmit sidelink signals (unlike wireless LANs that typically use unlicensed spectrum).

[0077] The UE can operate in various radio resource configurations, including configurations associated with using a dedicated resource set to transmit pilot signals (e.g., Radio Resource Control (RRC) dedicated state, etc.) or configurations associated with using a common resource set to transmit pilot signals (e.g., RRC common state, etc.). When operating in RRC dedicated state, the UE can select the dedicated resource set for transmitting pilot signals to the network. When operating in RRC common state, the UE can select the common resource set for transmitting pilot signals to the network. In either case, the pilot signals transmitted by the UE can be received by one or more network access devices (such as AN or DU or portions thereof). Each receiving network access device can be configured to receive and measure pilot signals transmitted on the common resource set, and also to receive and measure pilot signals transmitted on a dedicated resource set allocated to the UE (for which the network access device is a member of a set of network access devices monitored for the UE). A CU that receives measurement results from one or more network access devices, or from pilot signals sent to it by a network access device, can use the measurement results to identify the serving cell for a UE, or initiate a change to the serving cell for one or more of these UEs.

[0078] Example of a multi-TRP scenario

[0079] In 3GPP New Radio (NR) Release 16 (R16), multi-TRP operation was introduced to increase system capacity and reliability. Figure 6 and Figure 7 An example scenario is shown in which various aspects of this disclosure can be implemented.

[0080] like Figure 6 As shown, in some examples, multi-TRP transmissions can be configured based on a single downlink control information (DCI). (For example, a single DCI, sent from the first TRP (TRP 1) via PDCCH, schedules the Physical Downlink Shared Channel (PDSCH) from TRP 1 and the PDSCH from the second TRP (TRP 2).

[0081] Multiple TRP operations configured based on a single DCI communication are best suited for deployments with ideal backhaul or low-latency backhaul and can involve a variety of transport schemes. Transport schemes can include, for example, spatial division multiplexing (SDM), frequency division multiplexing (FDM), or time division multiplexing (TDM).

[0082] In the case of SDM (also known as Noncoherent Joint Transport (NCJT)), the first-layer set is transmitted from TRP 1, and the second-layer set is transmitted from TRP 2. The transmissions can utilize the same Frequency Domain Resource Allocation (FDRA) and Time Division Resource Allocation (TDRA). In the case of FDM, transmissions from both TRPs can have the same rank and the same codeword (CW), but different FDRAs across the two TRPs. In the case of TDM, transmissions from both TRPs can have the same rank and the same CW, but different TDRAs across the two TRPs.

[0083] In some cases, PDSCH can be sent in multiple parts. For example, TRP 1 can send the first part (on the first layer set, utilizing the first FDRA set and the first TDRA set) and TRP 2 can send the second part (on the second layer set, utilizing the second FDRA set and the second TDRA set).

[0084] like Figure 7 As shown, in some examples, multi-TRP transmissions can be configured based on multiple DCIs. In the case of multiple DCIs, each DCI schedules a separate PDSCH (similar to the CA framework). For example, the first DCI from TRP 1 (e.g., transmitted in PDCCH1) schedules PDSCH 1 from TRP 1, while the second DCI (e.g., transmitted in PDCCH 2) schedules PDSCH 2 from TRP 2. The two scheduled PDSCHs can overlap, not overlap, or partially overlap in the frequency or time domains.

[0085] Figure 8 An example resource mapping for an mTRP deployment using an FDM scheme is shown. As illustrated, two TRPs can occupy different sets of RBs (from a common FDRA) with corresponding TCI states (TCI 1 for TRP 1 and TCI 2 for TRP 2). The FDRA field in the DCI indicates the RB allocation for the two TCI states. As shown, for a Broadband Physical Resource Block Group (PRG), the first half of the RBs are assigned to TCI state 1 and the second half to TCI state 2. For a Narrowband PRG (equal to 2 or 4 RBs), even-numbered PRGs can be assigned to TCI state 1, while odd-numbered PRGs can be assigned to TCI state 2.

[0086] Figure 9Examples of different schemes for CW-to-layer mapping according to certain aspects of this disclosure are shown. As shown in 930, according to a first scheme (scheme 2a), there may be a CW and a RV that are mapped to resources in the order of layer, frequency domain, and time domain. According to a second scheme (scheme 2b), different RVs may be used to transmit the same TB. For example, as shown in 920, in RB set 1 (TRP1), the first RV may be used to transmit the TB, while in RB set 2 (TRP2), the second RV may be used for transmission.

[0087] Figure 10 and Figure 11 An example of a repeating TDM scheme based on different transmission schemes is shown. According to the first scheme (in... Figure 10 In scheme 3 shown, where there is repetition within a time slot, if two TCIs are indicated, the two TRPs can utilize different RVs to perform TDM transmissions with repetition. In some cases, the gap can be located between a first transmission opportunity with TCI state 1 and a second transmission opportunity with TCI state 2. In some cases, this gap can be configured (e.g., via a network). The lengths of the first and second transmission opportunities are the same. Figure 10 In this configuration, the first transmission is set with a start symbol index S=3 and a length L=4, as indicated by the TDRA field. The second transmission timing can have TCI state 2, which has a length L=4 (the same as the first transmission timing). In this case, the gap is 2 symbols.

[0088] According to another scheme (single-frequency network, SFN), the PDSCH transmitted from each TRP shares the same FDRA and TDRA, and transmits the same layer with the same codeword. In this case, each layer can be transmitted from two TRPs, and each DMR port can be associated with two different TCI states corresponding to TRP1 and TRP2.

[0089] According to another option (in) Figure 11 Scheme 4 shown can be repeated across time slots. In this case, up to 16 repetitions can be allowed across two TCI states. Figure 11 The example shown contains eight repeating examples. The TCI state pattern can also be configurable (e.g., 12121212 vs. 11221122), and the RV pattern for each TCI state follows the current standard (e.g., version 15, i.e., RV 0-2-3-1). The RV offset can be configurable and can be an RV offset.

[0090] Example methods for PMI, RI, and port indexes in mTRP CS

[0091] Various aspects of this disclosure relate to wireless communications, and more specifically, various aspects of this disclosure relate to techniques for reporting channel state information (CSI) (such as precoding matrix indicators (PMI) and layer indicators (LI)) in multi-transmitter receiver point (mTRP) scenarios.

[0092] Figure 12 Example CSI-RS reports and resource configurations for different mTRP CSI categories are shown. Depending on the category, the UE indicates its preference for a single TRP (communicating only with TRP 0 or only with TRP 1) or mTRPs (communicating with both TRP 0 and TRP 1) in different ways.

[0093] As shown in the figure, for Category 1 (Cat 1.1), the resources used for a single report configuration (report config 0) include at least two resources, each configured with a single TCI state (meaning each resource corresponds to a TRP; in other words, all ports within the resource are sent from a single TRP). Based on CSI-RS measurements, the UE can indicate a single TRP (TRP 0 or TRP 1) by reporting a CSI-RS Resource Indicator (CRI) value of 0 or 1. The UE can indicate an mTRP by reporting a CRI value of 2.

[0094] As shown in the figure, for Category 2 (Cat 1.2), the resources used for a single report configuration (report config 0) include two CSI-RS port groups, where each resource has two TCI states (one TCI state for each port group indicates that the port group corresponds to one TRP; in other words, a port in a port group is sent from one TRP). Based on CSI-RS measurements, the UE can indicate a single TRP (TRP 0 or TRP 1) by reporting the 0-rank indicator (RI) value for one of the CSI-RS port groups:

[0095] (RI0>0, 0) indicates TRP 0; or

[0096] (0, RI1>0) indicates TRP 1.

[0097] The UE can indicate mTRP by reporting a non-zero RI value for both:

[0098] (RI0>0, RI1>0) indicates mTRP.

[0099] Cat 1.2 can also be mixed with Cat 1.1. That is, some resources may include a single TCI state, while others may include two port groups, each with a TCI state. Based on CSI measurements, if the UE selects a single TRP transmission, the UE can report the CRI corresponding to the resource with a single TCI state; or if the UE selects multiple TRP transmissions, the UE can report the CRI corresponding to the resource with two TCI states.

[0100] As shown in the figure, for Category 3 (Cat 2), the two reporting configurations (report config 0 and report config 1) can each include a CSI-RS port group with a single TCI state. Based on CSI-RS measurements, the UE can indicate a single TRP (TRP 0 or TRP 1) by reporting the same 0 CRI value for both Report 0 and Report 1. The UE can indicate an mTRP by reporting a CRI value of 1 for both Report 0 and Report 1.

[0101] These current reporting and resource configurations present various potential challenges. For example, since the CSI-RS resource occupancy for each TRP spans a subset of the allocated frequency resources (RBs), one challenge is how to send CSI-RS and / or how to report CSI in the case of an FDM-based mTRP mode.

[0102] Another potential challenge for all SDM, FDM, and TDM schemes (where the PTRS port needs to be associated with the strongest layer (DMRS port) of each TRP) is how to identify and report the strongest layer of each TRP.

[0103] Another challenge in the CSI reporting framework (where CSI is calculated for each port group rather than for all ports in a resource) (e.g., for Cat 1.2) is how to clarify the port index in the PMI / CQI calculation.

[0104] This disclosure provides various technical (configuration and reporting) solutions to address these potential challenges. For example, Figure 13 and Figure 14 Example UE and network-side operations are shown for reporting PMI for each CSI-RS resource or port group on the corresponding frequency unit.

[0105] Figure 13 Example operation 1300 for wireless communication is shown according to certain aspects of this disclosure. Operation 1300 can be performed by, for example, a UE (e.g., UE 120 in wireless communication network 100).

[0106] At 1302, operation 1300 begins by receiving a Channel State Information (CSI) report configuration from a network entity, which indicates at least first and second CSI Reference Signal (CSI-RS) resources or port groups associated with the CSI report. For example, the UE may receive at least two CSI-RS resources (according to Cat 1.1) or at least two CSI-RS port groups (according to Cat 1.2) associated with one or more CSI reports (according to Cat 2). The UE may, for example, use any suitable detection and decoding algorithm, such as via... Figure 4 The UE 120a shown and / or in Figure 21 The device shown is configured to receive CSI reports using its antenna and receiver / transceiver components.

[0107] At 1304, the UE performs CSI measurements based on a Frequency Division Multiplexing (FDM) scheme, which includes transmissions over a first set of FD cells via a first resource or port group and transmissions over a second set of FD cells via a second resource or port group. The UE can, for example, use any suitable detection and algorithm for calculating the CSI metric, such as based on transmissions over a first set of FD cells via a second resource or port group. Figure 4 The UE 120a shown and / or in Figure 21 The device shown uses the antenna and receiver / transceiver assembly and processor to receive CSI-RS signals to perform CSI measurements.

[0108] At 1306, the UE sends a Precoding Matrix Indicator (PMI) report to the network entity. This PMI report indicates a first set of one or more PMIs associated with ports in a first resource or port group on a first FD unit set, and a second set of one or more PMIs associated with ports in a second resource or port group on a second FD unit set. The UE can, for example, use any suitable encoding and transmission algorithm, such as via... Figure 4 The UE 120a shown and / or in Figure 21 The device shown uses an antenna and receiver / transceiver assembly to transmit PMI reports.

[0109] Figure 14 It shows what can be considered to be related to Figure 13 The operation 1300 is complementary to the example operation 1400 for wireless communication. For example, operation 1400 can be performed by a network entity (e.g., a BS110 in wireless communication network 100 or a CU / DU that controls multiple TRPs) to configure and process the data from the operation. Figure 13 Operation 1300 UE PMI report.

[0110] At 1402, operation 1400 begins by sending a Channel State Information (CSI) report configuration to the User Equipment (UE), which indicates at least first and second CSI Reference Signal (CSI-RS) resource or port groups associated with the CSI report. At 1404, the network entity transmits the CSI-RS based on a Frequency Division Multiplexing (FDM) scheme, which includes transmission over a first FD unit set via a first resource or port group and transmission over a second FD unit set via a second resource or port group. For example, the network entity can use any suitable encoding and transmission algorithm via... Figure 4 The BS110a shown and / or in Figure 21 The device shown has an antenna and receiver / transceiver assembly for transmitting CSI report configuration (e.g., via RRC signaling) and CSI-RS.

[0111] At 1406, the network entity receives a Precoding Matrix Indicator (PMI) report from the UE, which indicates a first set of one or more PMIs associated with ports in a first resource or port group on a first FD unit set and a second set of one or more PMIs associated with ports in a second resource or port group on a second FD unit set. For example, the network entity can use any suitable detection and decoding algorithm, via... Figure 4 The BS110a shown and / or in Figure 21 The device shown has an antenna and receiver / transceiver assembly for receiving PMI reports.

[0112] In this way, for FDM schemes, the UE can report the PMI for each CSI-RS resource or port group on the corresponding frequency unit. Figure 15 This illustrates an example of how different (first and second) frequency domain (FD) unit sets (e.g., sub-bands) can be assigned to different TRPs (as CSI resources or port groups). Figure 15 As shown, the first FD unit (subband) set is assigned to either TRP1 (resource / port group 1) or TRP2 (resource / port group 2), while the second FD unit (subband) set is also assigned to either TRP1 (resource / port group 1) or TRP2 (resource / port group 2). As illustrated, the first FD unit set can include an even number of subbands, while the second FD unit set can include an odd number of subbands. Alternatively, a finer PMI granularity can be configured, such as PRG (smaller than the subband size), in which case the first FD unit set can include an even number of PRGs, and the second FD unit set can include an odd number of PRGs. Another alternative is that the first FD unit set can include the first half of the total FD units (the first half of the total subbands), while the second FD unit set can include the second half of the total FD units (the second half of the total subbands).

[0113] In some cases, the UE can use a first CSI-RS resource or port group on a first FD unit set and a second CSI-RS resource or port group on a second FD unit set to determine FDM-based transmission assumptions. The UE can perform CSI measurements and reporting on a first PMI set associated with the first CSI-RS resource or port group on the first FD unit set, and use a second PMI set associated with the second CSI-RS resource or port group on the second FD unit set.

[0114] There are various options for how the UE can determine the transmission scheme (e.g., FDM scheme). According to one option, the UE can receive the FDM scheme configuration in the CSI report configuration. According to another option, the UE can determine the transmission scheme from a set of candidate scheme hypotheses. Each candidate scheme can include, for example, an SDM scheme, an FDM scheme, or a TDM scheme. In such a case, the UE can report the selected (FDM) scheme.

[0115] Regarding how to determine the partitioning of Frequency Domain Resource Allocation (FDRA) (e.g., in...) Figure 15 The first / second FD unit set shown has various options. For example, the UE can determine that the FDRA indicates that the FD units are consecutive in the first and second halves of the FDRA ( Figure 8 (The diagram on the left) or staggered ( Figure 8 (See the diagram on the right). In some cases, this information can be configured by the network (e.g., via a 1-bit indicator in the CSI report configuration or via a PRG / subband group indicator, PRG = 2 or 4). More specifically, in the case of a 1-bit indicator, code point 0 (or 1) can indicate that the FDRA is divided into the first and second halves, while code point 1 (or 0) can indicate that the FDRA is interleaved. More specifically, if WB granularity is configured, the FDRA can be divided into the first and second halves; if PRG = 2 or 4 is configured, the FDRA can be interleaved based on PRG combs (even PRGs and odd PRGs); if subband grouping information is configured (e.g., 2 subbands in a group), the FDRA can be interleaved based on subband group combs (even subband groups and odd subband groups).

[0116] In some cases, the UE can determine FDRA based on actual CSI-RS transmissions. For example, the UE can detect that the first CSI-RS resource or port group is transmitted only in the first half and the second CSI-RS resource or port group is transmitted only in the second half. Similarly, the UE can detect that the first CSI-RS resource or port group is transmitted only on even (or odd) subbands / RB / PRG / subband groups and the second CSI-RS resource or port group is transmitted only on odd (or even) subbands / RB / PRG / subband groups, indicating interleaving. The UE can report the FDRA determination.

[0117] If the determination of FDRA is the first half / second half, then the first FD unit set is the first half or second half of the total CSI reporting subband or RB. If the determination of FDRA is interleaved, then the first FD unit set is the odd or even subband / RB / PRG / subband group. The TRP order (indicating which TRP was assigned to the first half / second half or odd / even) can be configured by the network (e.g., via a 1-bit indicator). In some cases, the TRP order (indicating which TRP was assigned to the first half / second half or odd / even) can be reported by the UE. In some cases, the FDRA (first half / second half or interleaved) and / or TRP order can be configured (or reported) jointly with the FDM scheme. More specifically, there are typically four assumptions for FDM schemes, such as {TRP1 in the first half, TRP2 in the second half}, {TRP1 in the second half, TRP2 in the first half}, {TRP1 on even-numbered FD cells, TRP2 on odd-numbered FD cells}, and {TRP1 on odd-numbered FD cells, TRP2 on even-numbered FD cells}. In some cases, the network can directly configure one of these assumptions. In some cases, the network can configure the FDRA partitioning as first half / second half, and the UE may need to report TRP orders from {TRP1 in the first half, TRP2 in the second half} and {TRP1 in the second half, TRP2 in the first half}, or the network can configure the FDRA partitioning as interleaved (even / odd FD cells), and the UE may need to report TRP orders from {TRP1 on even-numbered FD cells, TRP2 on odd-numbered FD cells} and {TRP1 on odd-numbered FD cells, TRP2 on even-numbered FD cells}. In some cases, the network can configure the TRP order so that TRP 1 is on the first FD unit set and TRP 2 is on the second FD unit set. The UE may need to report FDRA allocations from {TRP1 in the first half, TRP2 in the second half} and {TRP1 on even-numbered FD units, TRP2 on odd-numbered FD units}. Alternatively, the network can configure the TRP order so that TRP2 is on the first FD unit set and TRP1 is on the second FD unit set. The UE may need to report FDRA allocations from {TRP2 in the first half, TRP1 in the second half} and {TRP2 on even-numbered FD units, TRP1 on odd-numbered FD units}. In some other cases, the UE can report an FDRA allocation from one of four assumptions.

[0118] A first CSI-RS resource or port group can be sent on a first FD unit set, while a second CSI-RS resource or port group can be sent on a second FD unit set.

[0119] The total number of precoding matrices reported in each PMI set can be determined at least in part based on the number of subbands in the corresponding FD unit set. For example, if eType IICSI is applied to either the first or the second PMI set, the number of precoding matrices N3 (the size of the FD compression matrix) can be a function of the number of subbands in the corresponding FD unit set and higher-level parameters (e.g., numberOfPMISubbandsPerCQISubband-r16).

[0120] Figure 16 and Figure 17 Example UE and network-side operations for reporting LI pairs are shown. For example, each LI can be associated with one of the PMIs for each CSI-RS resource or port group on the corresponding frequency element.

[0121] Figure 16 Example operation 1600 for wireless communication is shown according to certain aspects of this disclosure. Operation 1600 can be performed, for example, by a UE (e.g., UE 120 in wireless communication network 100).

[0122] At 1602, operation 1600 begins by determining a transmission scheme for CSI reporting using at least first and second Channel State Information (CSI) Reference Signal (CSI-RS) resources or port groups. At 1604, the UE performs CSI measurements based on CSI-RS transmissions sent via at least first and second CSI-RS resources or port groups. The UE may use, for example, any suitable detection and algorithm, such as based on transmissions via at least first and second CSI-RS resources or port groups. Figure 4 The UE 120a shown and / or in Figure 21 The device shown uses the antenna and receiver / transceiver components and processor to receive CSI-RS signals to determine the transmission scheme and perform CSI measurements.

[0123] At 1606, the UE sends a Precoding Matrix Indicator (PMI) report to the network entity. This PMI report indicates a first set of one or more PMIs associated with a first resource or port group, a second set of one or more PMIs associated with a second resource or port group, a first Layer Indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set. The UE can, for example, use any suitable encoding and transmission algorithm, such as via... Figure 4 The UE120a shown and / or in Figure 21 The device shown uses an antenna and receiver / transceiver assembly to transmit PMI reports.

[0124] Figure 17 It shows what can be considered as... Figure 16Operation 1600 is complementary to example operation 1700 for wireless communication. For example, operation 1700 can be performed by a network entity (e.g., BS110 in wireless communication network 100 or CU / DU controlling multiple TRPs) to configure and process data from the execution. Figure 16 Operation 1600 UE PMI report.

[0125] At 1702, operation 1700 begins by transmitting CSI-RS to the User Equipment (UE) according to a transmission scheme that uses at least first and second Channel State Information (CSI) Reference Signal (CSI-RS) resources or port groups. For example, the network entity may use any suitable encoding and transmission algorithm, via... Figure 4 The BS110a shown and / or in Figure 21 The device shown uses an antenna and receiver / transceiver assembly to transmit CSI-RS.

[0126] At 1704, the network entity receives a Precoding Matrix Indicator (PMI) report from the UE. This PMI report indicates a first set of one or more PMIs associated with a first resource or port group, a second set of one or more PMIs associated with a second resource or port group, a first Layer Indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set. For example, the network entity can use any suitable detection and decoding algorithm, via... Figure 4 The BS110a shown and / or in Figure 21 The device shown has an antenna and receiver / transceiver assembly for receiving PMI reports.

[0127] In this way, the UE can determine the transmission scheme for CSI reporting using two CSI-RS resources or two CSI port groups, and report two LIs. In other words, of the two LIs, one LI is associated with a PMI measured and reported using one of the two CSI-RS resources or port groups, while the other LI is associated with a PMI measured and reported using the other of the two CSI / RS resources or port groups. In this way, each LI indicates the strongest layer among the layers indicated by the corresponding PMI. The transmission scheme can be SDM, FDM, TDM, or a single-frequency network (SFN) scheme.

[0128] In the current system, for example, PMI is typically calculated for each resource using CSI-RS ports 3000 to 3000+P-1 (where P is the number of ports). CQI is typically calculated based on a virtual PDSCH layer mapped to CSI-RS ports 3000 to 3000+P-1. This mapping is performed via the calculated PMI (e.g., matrix W(i)). Within each CSI-RS resource, the port index is 3000 to 3000+P-1.

[0129] A potential challenge with the current system (e.g., with Cat 1.2) is that one PMI is computed using the first port group and another PMI is computed using the second port group, which means that the associated port indices of the PMI and CQI should be changed.

[0130] Figure 18 and 19 Example UE and network-side operations for CSI reporting using CSI-RS port indexes are shown. For example, a UE can use the CSI-RS port index in the corresponding port group to perform PMI and CQI measurements.

[0131] Figure 18 Example operation 1800 for wireless communication is shown according to certain aspects of this disclosure. Operation 1800 can be performed by, for example, a UE (e.g., UE 120 in wireless communication network 100).

[0132] At 1802, operation 1800 begins by receiving a Channel State Information (CSI) report configuration from a network entity, the CSI report configuration indicating at least one CSI-RS resource including at least first and second CSI Reference Signal (CSI-RS) port groups. For example, the UE can, for instance, use any suitable detection and decoding algorithm, via... Figure 4 The UE120a shown and / or in Figure 21 The device shown is configured to receive CSI reports using its antenna and receiver / transceiver components.

[0133] At 1804, the UE determines the CSI codebook associated with each CSI-RS port used for Precoding Matrix Indicator (PMI) and Channel Quality Indicator (CQI) measurements. At 1806, the UE performs PMI and CQI measurements using the determined CSI codebook with the CSI-RS port index in the corresponding CSI-RS port group, and reports the first PMI mapped to the port index in the first group and the second PMI mapped to the port index in the second group. The UE can, for example, use any suitable detection and algorithm, such as based on... Figure 4 The UE 120a shown and / or in Figure 21The antenna and receiver / transceiver components and processor of the device shown receive signals to determine the CSI codebook and perform CSI measurements.

[0134] At 1806, the UE sends a Precoding Matrix Indicator (PMI) report to the network entity. This PMI report indicates a first set of one or more PMIs associated with ports in the first resource or port group on the first FD unit set, and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD unit set. The UE can, for example, use any suitable encoding and transmission algorithm, such as via... Figure 4 The UE 120a shown and / or in Figure 21 The device shown uses an antenna and receiver / transceiver assembly to transmit PMI reports.

[0135] Figure 19 It shows what can be considered as... Figure 18 Operation 1800 is complementary to example operation 1900 for wireless communication. For example, operation 1900 can be performed by a network entity (e.g., a BS110 in wireless communication network 100 or a CU / DU that controls multiple TRPs) to configure and process data from the execution. Figure 18 The operation of UE 1800 utilizes CSI-RS port index CSI report.

[0136] At 1902, operation 1900 begins by sending a Channel State Information (CSI) report configuration to the User Equipment (UE), the CSI report configuration indicating at least one CSI-RS resource including at least first and second CSI Reference Signal (CSI-RS) port groups. For example, the network entity may use any suitable encoding and transmission algorithm, via... Figure 4 The BS110a shown and / or in Figure 21 The device shown has an antenna and receiver / transceiver assembly for transmitting CSI report configuration (e.g., via RRC signaling) and CSI-RS.

[0137] At 1904, the network entity determines the CSI codebook associated with each CSI-RS port used for Precoding Matrix Indicator (PMI) and Channel Quality Indicator (CQI) measurements. For example, the network entity can use any suitable detection and algorithm, based on... Figure 4 The BS110a shown and / or in Figure 21 The antenna and receiver / transceiver components and processor of the device shown receive signals to determine the CSI codebook.

[0138] At 1906, the network entity receives reports from the UE of a first PMI mapped to a port index in the first group and a second PMI mapped to a port index in the second group. These reports are based on PMI and CQI measurements performed by the UE using the CSI-RS port index in the corresponding CSI-RS port group and the determined CSI codebook. For example, the network entity can use any suitable detection and decoding algorithm, via... Figure 4 The BS110a shown and / or in Figure 21 The device shown has an antenna and receiver / transceiver assembly for receiving PMI reports.

[0139] You can refer to Figures 20A-20C To understand CSI-RS reports using CSI-RS port indexes, Figures 20A-20C This illustrates how a UE can determine the PMI using ports with indices starting at 3000+p_{i,offset} for different numbers of antenna ports and different codebook type configurations, where 3000+p_{i,offset} is the port index of the first port within the i-th port group in the CSI-RS resource. In some cases, p_{i,offset} is the total number of ports in the port group with group indices less than i. In some cases, p_{i,offset} is the offset between the first port in the i-th port group and the first port in the resource. In some cases, if each group has p ports, then p_{i,offset} = p*(i-1) (if the first group index is 1) or p_{i,offset} = p*i (if the first group index is 0).

[0140] Figure 20A This demonstrates how a UE can determine the PMI using port indices for 4-32 antenna ports when configured with a higher-layer parameter codebookType set to “typeI-SinglePannel / typeII / typeII-PortSelection / typeII-r16 / typeII-PortSelection-r16”. Figure 20B This demonstrates how a UE can determine the PMI using port indices for 8-32 antenna ports when the higher-layer parameter codebookType is configured as “typeI-MultiPanel”. Figure 20CThis illustrates how a UE can determine the PMI using port indices for two antenna ports when the higher-layer parameter codebookType is configured as “typeI-SinglePanel”. In each case, if no port group is configured, i can be set to zero (essentially reverting to the regular non-port-indexed CSI-RS report).

[0141] For the SDM scheme, for CQI calculation, the UE can assume that the PDSCH signal on the antenna port in the set [1000,…,1000+ν-1] for ν layers will produce a signal equivalent to the corresponding symbol transmitted on the antenna port [3000,…,3000+P-1], as given by the following equation:

[0142]

[0143] W1 can be calculated using a first port group with indices 3000 to 3000+P1-1, and there are v1 layers included in W1. W2 can be calculated using a second port group with indices 3000+P1 to 3000+P-1, and there are v-v1 layers included in W2. P1 is the number of ports in the first port group, and P is the total number of ports in the resource.

[0144] For TDM and FDM schemes, for CQI calculation, the UE can assume that the PDSCH signal on the antenna port in the set [1000,…,1000+ν-1] for ν layers will produce a signal equivalent to the corresponding symbol transmitted on the antenna port [3000,…,3000+P-1], as given by the following equation:

[0145]

[0146] If it is an FDM scheme, then on the first FD element set; or if it is a TDM scheme, then on the first TD element set.

[0147]

[0148] If it is an FDM scheme, then it is on the second FD unit set; or if it is a TDM scheme, then it is on the second TD unit set, where the layers mapped to W1 and W2 are the same layers from the same TB. The mapping process can follow the layer mapping defined for mTRP FDM and TDM schemes (e.g., as referenced). Figure 9 (Described).

[0149] Figure 21 A communication device 2100 is shown, which may include operations configured to perform the techniques disclosed herein (such as in...). Figure 13 , 14 Various components (e.g., corresponding to unit plus functional components) of the operations shown in 16, 17, 18 and / or 19. The communication device 2100 includes a processing system 2102 coupled to a transceiver 2108. The transceiver 2108 is configured to transmit and receive signals for the communication device 2100, such as the various signals described herein, via an antenna 2110. The processing system 2102 may be configured to perform processing functions for the communication device 2100, including processing signals received and / or to be transmitted by the communication device 2100.

[0150] Processing system 2102 includes processor 2104 coupled to computer-readable medium / memory 2112 via bus 2106. In some aspects, computer-readable medium / memory 2112 is configured to store instructions (e.g., computer-executable code) that, when executed by processor 2104, cause processor 2104 to perform... Figure 13 , 14 The operations shown in 16, 17, 18, and / or 19. In some aspects, the computer-readable medium / memory 2112 stores: code 2114 for determining; code 2116 for transmitting; code 2118 for receiving; and code 2119 for executing. In some aspects, the processor 2104 has circuitry configured to implement the code stored in the computer-readable medium / memory 2112. The processor 2104 includes: circuitry 2120 for determining; circuitry 2122 for transmitting; circuitry 2124 for receiving; and circuitry 2126 for executing.

[0151] The methods disclosed herein include one or more steps or actions for implementing the methods. These method steps and / or actions may be interchanged with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of a particular step and / or action may be modified without departing from the scope of the claims.

[0152] Example

[0153] Aspect 1: A method for wireless communication by a user equipment (UE), comprising: receiving a channel state information (CSI) report configuration from a network entity, the CSI report configuration indicating at least first and second CSI reference signal (CSI-RS) resources or port groups associated with the CSI report; performing CSI measurements based on a frequency division multiplexing (FDM) scheme, the FDM scheme including transmission over a first FD unit set via a first resource or port group and transmission over a second FD unit set via a second resource or port group; and sending a precoding matrix indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with ports in the first resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD unit set.

[0154] Aspect 2: According to the method of aspect 1, wherein the FD unit includes a sub-band or a PRG.

[0155] Aspect 3: The method according to aspect 2 further includes: receiving a configuration indicating the FDM scheme.

[0156] Aspect 4: The method according to aspect 2 further includes: selecting an FDM scheme from a set of candidate schemes; and reporting the selected FDM scheme to the network entity.

[0157] Aspect 5: The method according to any one of Aspects 1-3 further includes: receiving an indication of a frequency domain resource allocation (FDRA), the FDRA indicating whether the first FD cell set and the second FD cell set are interleaved or span consecutive FD cell sets.

[0158] Aspect 6: The method according to aspect 5, wherein the indication is provided via the CSI report configuration or via a precoded block resource group (PRG) or subband group indicator.

[0159] Aspect 7: According to the method of aspect 6, wherein the configuration includes a joint configuration of an FDM scheme for CSI measurement and an FDRA for the first FD unit set of the first resource or port group and an FDRA for the first FD unit set of the second FD unit set of the first resource or port group.

[0160] Aspect 8: The method according to any one of Aspects 1-7 further includes: determining, based on actual CSI-RS transmissions, whether the first FD unit set and the second FD unit set are interleaved or span consecutive FD unit sets.

[0161] Aspect 9: The method according to any one of Aspects 1-8 further includes: selecting a candidate frequency division resource allocation FDRA from a set of candidate FDRAs for the first FD unit set and the second FD unit set; and reporting the selected FDRA to the network entity.

[0162] Aspect 10: The method according to aspect 9, wherein the report jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

[0163] Aspect 11: The method according to any one of Aspects 1-10, wherein: the total number of precoding matrices reported in the first PMI set is determined at least in part based on the number of subbands in the first FD unit set; and the total number of precoding matrices reported in the second PMI set is determined at least in part based on the number of subbands in the second FD unit set.

[0164] Aspect 12: The method according to any one of Aspects 1-11, wherein: if a particular type of CSI is applied to either the first PMI set or the second PMI set, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD unit set and the configured parameters.

[0165] Aspect 13: A method for wireless communication by a user equipment (UE), comprising: determining a transmission scheme for reporting CSI using at least first and second Channel State Information (CSI) Reference Signal (CSI-RS) resources or port groups; performing CSI measurements based on CSI-RS transmissions transmitted via at least the first CSI-RS resource or port group and the second CSI-RS resource or port group; and sending a precoding matrix indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with the first resource or port group, a second set of one or more PMIs associated with the second resource or port group, a first layer indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set.

[0166] Aspect 14: The method according to aspect 13, wherein the transmission scheme includes spatial division multiplexing (SDM).

[0167] Aspect 15: The method according to any one of Aspects 13-14, wherein the transmission scheme includes Time Division Multiplexing (TDM).

[0168] Aspect 16: The method according to any one of Aspects 13-15, wherein the transmission scheme includes Frequency Division Multiplexing (FDM).

[0169] Aspect 17: The method according to aspect 16, wherein: the first CSI measurement is performed based on the first CSI-RS resource or port group received on the first frequency domain (FD) unit set; and the second CSI measurement is performed based on the second CSI-RS resource or port group received on the second FD unit set.

[0170] Aspect 18: The method according to any one of Aspects 13-17, wherein: the first LI indicates the strongest layer among the layers indicated by the first PMI set; and the second LI indicates the strongest layer among the layers indicated by the second PMI set.

[0171] Aspect 19: A method for wireless communication by a user equipment (UE), comprising: receiving a channel state information (CSI) report configuration from a network entity, the configuration indicating at least one CSI-RS resource including at least first and second CSI reference signal (CSI-RS) port groups; determining a CSI codebook associated with each CSI-RS port for precoding matrix indicator (PMI) and channel quality indicator (CQI) measurements; and using the determined CSI codebook, performing PMI and CQI measurements using CSI-RS port indices in the respective CSI-RS port groups, and reporting a first PMI mapped to a port index in the first group and a second PMI mapped to a port index in the second group.

[0172] Aspect 20: The method according to aspect 19, wherein the CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

[0173] Aspect 21: According to the method of aspect 20, wherein if the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first port group having a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second port group having a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

[0174] Aspect 22: The method according to any one of Aspects 19-21, wherein if the transmission scheme includes a frequency division multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a physical downlink shared channel (PDSCH): the first PMI maps the first layer to the first port group on the first frequency domain (FD) cell set; and the second PMI maps the second layer to the second port group on the second FD cell set.

[0175] Aspect 23: The method according to any one of Aspects 19-22, wherein if the transmission scheme includes a time division multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a physical downlink shared channel (PDSCH): the first PMI maps the first layer to the first port group on a first time domain (TD) unit set; and the second PMI maps the second layer to the second port group on a second TD unit set.

[0176] Aspect 24: A method for wireless communication by a network entity, comprising: sending a Channel State Information (CSI) report configuration to a user equipment (UE), the CSI report configuration indicating at least first and second CSI Reference Signal (CSI-RS) resources or port groups associated with the CSI report; and transmitting the CSI-RS based on a Frequency Division Multiplexing (FDM) scheme, the FDM scheme including transmission over a first FD unit set via a first resource or port group and transmission over a second FD unit set via a second resource or port group; and receiving a Precoding Matrix Indicator (PMI) report from the UE, the PMI report indicating a first set of one or more PMIs associated with ports in the first resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second resource or port group on the second FD unit set.

[0177] Aspect 25: The method according to aspect 24, wherein the FD unit includes a sub-band or a PRG.

[0178] Aspect 26: The method according to aspect 25 further includes: sending to the UE an instruction on the configuration of the FDM scheme.

[0179] Aspect 27: The method according to any one of Aspects 24-25 further includes: sending a set of candidate schemes to the UE; and receiving from the UE a report indicating an FDM scheme selected from the set of candidate schemes.

[0180] Aspect 28: The method according to any one of Aspects 24-27 further includes: providing the UE with an indication of frequency domain resource allocation (FDRA), the FDRA indicating whether the first FD cell set and the second FD cell set are interleaved or span consecutive FD cell sets.

[0181] Aspect 29: The method according to aspect 28, wherein the indication is provided via the CSI report configuration or via a precoded block resource group (PRG) or subband group indicator.

[0182] Aspect 30: The method according to aspect 29, wherein the configuration includes a joint configuration of an FDM scheme for CSI measurement and an FDRA for the first FD unit set of the first resource or port group and an FDRA for the first FD unit set of the second FD unit set of the first resource or port group.

[0183] Aspect 31: The method according to any one of Aspects 24-30 further includes: sending a set of candidate frequency domain resource allocations (FDRAs) to the UE; and receiving from the UE an indication of an FDRA selected from the set of candidate FDRAs.

[0184] Aspect 32: The method according to aspect 31, wherein the indication jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

[0185] Aspect 33: The method according to any one of Aspects 24-32, wherein: the total number of precoding matrices reported in the first PMI set is determined at least in part based on the number of subbands in the first FD set cells; and the total number of precoding matrices reported in the second PMI set is determined at least in part based on the number of subbands in the second FD set cells.

[0186] Aspect 34: The method according to any one of Aspects 24-33, wherein: if a particular type of CSI is applied to either the first PMI set or the second PMI set, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD cell set and the configured parameters.

[0187] Aspect 35: A method for wireless communication by a network entity, comprising: transmitting a CSI-RS to a user equipment (UE) according to a transmission scheme using at least first and second channel state information (CSI) reference signal (CSI-RS) resources or port groups; and receiving a precoding matrix indicator (PMI) report from the UE, the PMI report indicating a first set of one or more PMIs associated with the first resource or port group, a second set of one or more PMIs associated with the second resource or port group, a first layer indicator (LI) associated with the first PMI set, and a second LI associated with the second PMI set.

[0188] Aspect 36: The method according to aspect 35, wherein the transmission scheme includes spatial division multiplexing (SDM).

[0189] Aspect 37: The method according to aspects 35-36, wherein the transmission scheme includes time division multiplexing (TDM).

[0190] Aspect 38: The method according to aspects 35-37, wherein the transmission scheme includes frequency division multiplexing (FDM).

[0191] Aspect 39: The method according to aspects 35-38, wherein: the first LI indicates the strongest layer among the layers indicated by the first PMI set; and the second LI indicates the strongest layer among the layers indicated by the second PMI set.

[0192] Aspect 40: A method for wireless communication by a network entity, comprising: sending a channel state information (CSI) report configuration to a user equipment (UE), the CSI report configuration indicating at least one CSI-RS resource including at least first and second CSI reference signal (CSI-RS) port groups; determining a CSI codebook associated with each CSI-RS port for precoding matrix indicator (PMI) and channel quality indicator (CQI) measurements; and receiving from the UE a report of a first PMI mapped to a port index in the first group and a second PMI mapped to a port index in the second group, the report being based on PMI and CQI measurements performed by the UE using the determined CSI codebook and using the CSI-RS port indexes in the respective CSI-RS port groups.

[0193] Aspect 41: The method according to aspect 40, wherein the CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

[0194] Aspect 42: According to the method of aspect 41, wherein if the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first port group having a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second port group having a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

[0195] Aspect 43: According to the method of aspects 40-42, wherein if the transmission scheme includes a frequency division multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a physical downlink shared channel (PDSCH): the first PMI maps the first layer to the first port group on the first frequency domain (FD) cell set; and the second PMI maps the second layer to the second port group on the second FD cell set.

[0196] Aspect 44: According to the method of aspects 40-43, wherein if the transmission scheme includes a time division multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a physical downlink shared channel (PDSCH): the first PMI maps the first layer to the first port group on the first time domain (TD) unit set; and the second PMI maps the second layer to the second port group on the second TD unit set.

[0197] Aspect 45: An apparatus comprising at least one processor and a memory, said at least one processor and said memory being configured to perform operations of the method according to any one of aspects 1-44.

[0198] Aspect 46: An apparatus comprising a unit for performing operations according to any one of aspects 1-44.

[0199] Aspect 47: A computer-readable medium having instructions stored thereon for performing operations according to any one of aspects 1-44.

[0200] As used in this article, the phrase “at least one of” in a list of items refers to any combination of those items, including a single member. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0201] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" can include calculation, operation, processing, derivation, investigation, lookup (e.g., searching in a table, database, or other data structure), ascertainment, and so on. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and so on. Additionally, "determine" can include parsing, selecting, choosing, establishing, and so on.

[0202] The foregoing description is provided to enable any person skilled in the art to implement the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are given the full scope consistent with the text of the claims, wherein, unless expressly stated otherwise, references to elements in the singular form are not intended to mean “one and only one,” but rather “one or more.” Unless expressly stated otherwise, the term “some” means one or more. All structural and functional equivalents of the elements throughout the various aspects described in this disclosure are expressly incorporated herein by reference and intended to be included by the claims, such structural and functional equivalents being known or to be known by those skilled in the art. Furthermore, nothing disclosed herein is intended to be offered to the public, whether or not such disclosure is expressly stated in the claims. No claim element is to be interpreted pursuant to 35 U.SC §112(f) unless the element is expressly stated using the phrase “unit for…” or, in the case of a method claim, using the phrase “step for…”.

[0203] The various operations of the methods described above can be performed by any suitable unit capable of performing the corresponding function. These units may include various hardware and / or software components and / or modules, including but not limited to: circuits, application-specific integrated circuits (ASICs), or processors. Typically, in the presence of operations shown in the figures, those operations may have corresponding paired units plus functional components with similar numbering.

[0204] The various illustrative logic blocks, modules, and circuits described in connection with this disclosure can be implemented or executed using a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0205] If implemented in hardware, an example hardware configuration could include a processing system in a wireless node. The processing system could utilize a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus could include any number of interconnect buses and bridges. The bus could link together various circuits, including a processor, machine-readable media, and a bus interface. In addition, the bus interface could be used to connect a network adapter to the processing system via the bus. The network adapter could be used to implement signal processing functions at the PHY layer. In user terminal 120 (see...) Figure 1 In this case, a user interface (e.g., keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and therefore will not be described further. The processor can be implemented using one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software. Those skilled in the art will recognize how the functions described for the processing system can be optimally implemented based on the specific application and the overall design constraints imposed on the system as a whole.

[0206] If implemented in software, the functionality can be stored or transmitted as one or more instructions or code on or through a computer-readable medium. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, software should be broadly interpreted to mean instructions, data, or any combination thereof. Computer-readable media includes both computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of a computer program from one place to another. The processor may be responsible for managing the bus and general-purpose processing, including executing software modules stored on the machine-readable storage medium. The computer-readable storage medium may be coupled to the processor so that the processor can read information from and write information to the storage medium. Alternatively, the storage medium may be an integral part of the processor. For example, the machine-readable medium may include a transmission line, a carrier wave modulated by data, and / or a separate computer-readable storage medium containing instructions stored thereon, all accessible to the processor via a bus interface. Alternatively or additionally, the machine-readable medium or any portion thereof may be integrated into the processor; for example, this could be a cache and / or a general-purpose register file. For example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0207] Software modules may include a single instruction or many instructions, and may be distributed across several different code segments, within different programs, and across multiple storage media. Computer-readable media may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include sending modules and receiving modules. Each software module may reside in a single storage device or be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into RAM. During the execution of a software module, the processor may load some of the instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general-purpose register file for execution by the processor. It will be understood that when the functionality of a software module is referred to below, this functionality is implemented by the processor when executing the instructions from that software module.

[0208] Furthermore, any connection is appropriately referred to as computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (e.g., infrared (IR), radio, and microwave), then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (e.g., infrared, radio, and microwave) is included in the definition of medium. As used herein, disk and disc include compressed optical disc (CD), laser disc, optical disc, digital versatile optical disc (DVD), floppy disk, and... Optical discs, where magnetic disks typically copy data magnetically, utilize lasers to optically copy data. Therefore, in some aspects, computer-readable media can include non-transitory computer-readable media (e.g., tangible media). Furthermore, in other aspects, computer-readable media can include transient computer-readable media (e.g., signals). The combination of the above should also be included within the scope of computer-readable media.

[0209] Therefore, certain aspects may include a computer program product for performing the operations described herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded thereon) thereon, which can be executed by one or more processors to perform the operations described herein. Figure 7 and / or Figure 8 The instructions for the operation are shown in the image.

[0210] Furthermore, it should be understood that modules and / or other suitable units for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station, where applicable. For example, such a device can be coupled to a server to facilitate the transmission of units for performing the methods described herein. Alternatively, the various methods described herein can be provided via storage units (e.g., RAM, ROM, physical storage media such as compressed optical discs (CDs) or floppy disks, etc.) so that the user terminal and / or base station can access the various methods when the storage units are coupled to or provided to the device. Furthermore, any other suitable techniques for providing the methods and techniques described herein to the device can be used.

[0211] It should be understood that the claims are not limited to the precise configurations and components shown above. Various modifications, alterations, and variations may be made in the arrangement, operation, and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a user equipment (UE), comprising: Receive Channel State Information (CSI) report configuration from network entities, wherein the CSI report configuration indicates at least a first CSI Reference Signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report; CSI measurements are performed based on a Frequency Division Multiplexing (FDM) scheme, wherein the FDM scheme includes transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups, the second set of FD units being different from the first set of FD units. Each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs. Send a Precoding Matrix Indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with ports in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second CSI-RS resource or port group on the second FD unit set.

2. The method according to claim 1, further comprising: Receive the configuration indicating the FDM scheme.

3. The method according to claim 1, further comprising: Select an FDM scheme from the set of candidate schemes; as well as Report the selected FDM scheme to the network entity.

4. The method according to claim 1, further comprising: Receive an instruction for a frequency domain resource allocation FDRA, wherein the FDRA indicates that the first FD cell set and the second FD cell set are interleaved.

5. The method according to claim 4, wherein, The indication is provided via the CSI report configuration or via the precoded block resource group (PRG) or subband group indicator.

6. The method according to claim 5, wherein, The configuration includes an FDM scheme for CSI measurements and a combined configuration of an FDRA for the first FD unit set of the first CSI-RS resource or port group and an FDRA for the second FD unit set of the second CSI-RS resource or port group.

7. The method according to claim 1, further comprising: The first FD unit set and the second FD unit set are interleaved based on actual CSI-RS transmissions.

8. The method according to claim 1, further comprising: Select candidate FDRAs for the first FD unit set and the second FD unit set from the candidate frequency domain resource allocation FDRA set; as well as Report the selected FDRA to the network entity.

9. The method according to claim 8, wherein, The report jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

10. The method according to claim 1, wherein: The total number of precoding matrices reported in the first set of one or more PMIs is determined at least in part based on the number of subbands in the first FD unit set; and The total number of precoding matrices reported in the second set of one or more PMIs is determined at least in part based on the number of subbands in the second FD unit set.

11. The method according to claim 1, wherein: If eTypeIICSI is applied to either the first set of the one or more PMIs or the second set of the one or more PMIs, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD cell set and the configured parameters.

12. A method for wireless communication by a user equipment (UE), comprising: Determine a transmission scheme for CSI reporting using at least a first channel state information CSI reference signal CSI-RS resource or port group and a second CSI-RS resource or port group; CSI measurements are performed based on CSI-RS transmissions sent via at least the first CSI-RS resource or port group and the second CSI-RS resource or port group; as well as A precoding matrix indicator (PMI) report is sent to the network entity, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator (LI) associated with the first set of one or more PMIs, and a second LI associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

13. The method according to claim 12, wherein, The transmission scheme includes spatial multiplexing (SDM).

14. The method according to claim 12, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

15. The method according to claim 12, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

16. The method of claim 15, wherein: The first CSI measurement is performed based on the first CSI-RS resource or port group received on the first frequency domain FD cell set; and The second CSI measurement is performed based on the second CSI-RS resource or port group received on the second FD unit set.

17. A method for wireless communication by a user equipment (UE), comprising: Receive Channel State Information (CSI) Report Configuration from Network Entities, the configuration indicating that it includes at least one CSI-RS resource from at least a first CSI Reference Signal (CSI-RS) port group and a second CSI-RS port group; Determine the CSI codebook associated with each CSI-RS port used for the precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as Using the CSI-RS port index in the corresponding CSI-RS port group, perform PMI and CQI measurements using the determined CSI codebook, and report the first PMI mapped to the port index in the first CSI-RS port group and the second PMI mapped to the port index in the second CSI-RS port group. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

18. The method according to claim 17, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

19. The method of claim 17, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

20. The method of claim 17, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

21. A method for wireless communication by a network entity, comprising: The channel state information (CSI) report configuration is configured to indicate at least a first CSI reference signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report. as well as CSI-RS is transmitted based on a Frequency Division Multiplexing (FDM) scheme, wherein the FDM scheme includes transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups. The second set of FD units differs from the first set of FD units. Each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs. Receive a precoding matrix indicator PMI report, the PMI report indicating a first set of one or more PMIs associated with a port in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with a port in the second CSI-RS resource or port group on the second FD unit set.

22. The method of claim 21, further comprising: Send instructions on the configuration of the FDM scheme.

23. The method of claim 21, further comprising: Send a set of candidate solutions; as well as Receive a report indicating the FDM scheme selected from the set of candidate schemes.

24. The method of claim 23, further comprising: Provides an indication of frequency domain resource allocation FDRA, the FDRA indicating that the first FD cell set and the second FD cell set are interleaved.

25. The method according to claim 24, wherein, The indication is provided via the CSI report configuration or via the precoded block resource group (PRG) or subband group indicator.

26. The method of claim 25, wherein, The configuration includes an FDM scheme for CSI measurements and a combined configuration of an FDRA for the first FD unit set of the first CSI-RS resource or port group and an FDRA for the second FD unit set of the second CSI-RS resource or port group.

27. The method of claim 21, further comprising: Send the candidate frequency domain resource allocation (FDRA) set; as well as Receive an instruction for selecting an FDRA from the candidate FDRA set.

28. The method according to claim 27, wherein, The indication jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

29. The method according to claim 21, wherein: The total number of precoding matrices reported in the first set of one or more PMIs is determined at least in part based on the number of subbands in the first FD unit set; and The total number of precoding matrices reported in the second set of one or more PMIs is determined at least in part based on the number of subbands in the second FD unit set.

30. The method according to claim 21, wherein: If eType IICSI is applied to either the first set of the one or more PMIs or the second set of the one or more PMIs, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD cell set and the configured parameters.

31. A method for wireless communication by a network entity, comprising: CSI-RS is transmitted according to a transmission scheme that uses at least the first channel state information CSI reference signal CSI-RS resource or port group and the second CSI-RS resource or port group. as well as Receive a precoding matrix indicator PMI report, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator LI associated with the first set of one or more PMIs, and a second LI associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

32. The method according to claim 31, wherein, The transmission scheme includes spatial multiplexing (SDM).

33. The method according to claim 31, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

34. The method according to claim 31, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

35. A method for wireless communication by a network entity, comprising: The CSI report configuration is configured to send channel state information, and the CSI report configuration indicates that at least one CSI-RS resource is included in at least a first CSI reference signal CSI-RS port group and a second CSI-RS port group. Determine the CSI codebook associated with each CSI-RS port used for the precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as The system receives reports of a first PMI mapped to a port index in the first CSI-RS port group and a second PMI mapped to a port index in the second CSI-RS port group. These reports are based on PMI and CQI measurements performed by the UE using the CSI-RS port index in the corresponding CSI-RS port group and a determined CSI codebook. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

36. The method according to claim 35, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

37. The method of claim 35, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

38. The method according to claim 35, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

39. An apparatus for wireless communication by a user equipment (UE), comprising: At least one processor and memory are configured as follows: Receive Channel State Information (CSI) report configuration from network entities, wherein the CSI report configuration indicates at least a first CSI Reference Signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report; CSI measurements are performed based on a Frequency Division Multiplexing (FDM) scheme, wherein the FDM scheme includes transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups, the second set of FD units being different from the first set of FD units. Each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs. Send a Precoding Matrix Indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with ports in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with ports in the second CSI-RS resource or port group on the second FD unit set.

40. The apparatus according to claim 39, wherein, The at least one processor and the memory are also configured to receive a configuration indicating the FDM scheme.

41. The apparatus according to claim 39, wherein, The at least one processor and the memory are further configured to: Select an FDM scheme from the candidate scheme set; and Report the selected FDM scheme to the network entity.

42. The apparatus according to claim 39, wherein, The at least one processor and the memory are further configured to receive an instruction for a frequency domain resource allocation (FDRA), the FDRA indicating that the first FD unit set and the second FD unit set are interleaved.

43. The apparatus according to claim 42, wherein, The indication is provided via the CSI report configuration or via the precoded block resource group (PRG) or subband group indicator.

44. The apparatus according to claim 43, wherein, The configuration includes an FDM scheme for CSI measurements and a combined configuration of an FDRA for the first FD unit set of the first CSI-RS resource or port group and an FDRA for the second FD unit set of the second CSI-RS resource or port group.

45. The apparatus according to claim 39, wherein, The at least one processor and the memory are further configured to determine that the first FD unit set and the second FD unit set are interleaved based on actual CSI-RS transmissions.

46. ​​The apparatus according to claim 39, wherein, The at least one processor and the memory are further configured to: Select candidate FDRAs from the candidate frequency domain resource allocation FDRA set for the first FD cell set and the second FD cell set; and Report the selected FDRA to the network entity.

47. The apparatus according to claim 46, wherein, The report jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

48. The apparatus according to claim 39, wherein: The total number of precoding matrices reported in the first set of one or more PMIs is determined at least in part based on the number of subbands in the first FD unit set; and The total number of precoding matrices reported in the second set of one or more PMIs is determined at least in part based on the number of subbands in the second FD unit set.

49. The apparatus according to claim 39, wherein: If eType IICSI is applied to either the first set of the one or more PMIs or the second set of the one or more PMIs, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD cell set and the configured parameters.

50. An apparatus for wireless communication by a user equipment (UE), comprising: At least one processor and memory are configured as follows: Determine a transmission scheme for CSI reporting using at least a first channel state information CSI reference signal CSI-RS resource or port group and a second CSI-RS resource or port group; CSI measurements are performed based on CSI-RS transmissions sent via at least the first CSI-RS resource or port group and the second CSI-RS resource or port group; as well as A precoding matrix indicator (PMI) report is sent to the network entity, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator (LI) associated with the first set of one or more PMIs, and a second LI associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

51. The apparatus according to claim 50, wherein, The transmission scheme includes spatial multiplexing (SDM).

52. The apparatus according to claim 50, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

53. The apparatus according to claim 50, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

54. The apparatus according to claim 53, wherein: The first CSI measurement is performed based on the first CSI-RS resource or port group received on the first frequency domain FD cell set; and The second CSI measurement is performed based on the second CSI-RS resource or port group received on the second FD unit set.

55. An apparatus for wireless communication by a user equipment (UE), comprising: At least one processor and memory are configured as follows: Receive Channel State Information (CSI) Report Configuration from Network Entities, the configuration indicating that it includes at least one CSI-RS resource from at least a first CSI Reference Signal (CSI-RS) port group and a second CSI-RS port group; Determine the CSI codebook associated with each CSI-RS port used for the precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as Using the CSI-RS port index in the corresponding CSI-RS port group, perform PMI and CQI measurements using the determined CSI codebook, and report the first PMI mapped to the port index in the first CSI-RS port group and the second PMI mapped to the port index in the second CSI-RS port group. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

56. The apparatus according to claim 55, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

57. The apparatus according to claim 55, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

58. The apparatus according to claim 55, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

59. An apparatus for wireless communication by a network entity, comprising: At least one processor and memory are configured as follows: The system transmits Channel State Information (CSI) report configurations, which indicate at least a first CSI Reference Signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report; and CSI-RS is transmitted based on a Frequency Division Multiplexing (FDM) scheme, wherein the FDM scheme includes transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups. The second set of FD units differs from the first set of FD units. Each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs. Receive a precoding matrix indicator PMI report, the PMI report indicating a first set of one or more PMIs associated with a port in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with a port in the second CSI-RS resource or port group on the second FD unit set.

60. The apparatus according to claim 59, wherein, The at least one processor and the memory are also configured to: send a configuration indicating the FDM scheme.

61. The apparatus according to claim 59, wherein, The at least one processor and the memory are further configured to: Send a set of candidate solutions; and Receive a report indicating the FDM scheme selected from the set of candidate schemes.

62. The apparatus according to claim 59, wherein, The at least one processor and the memory are further configured to provide an indication of a frequency domain resource allocation (FDRA), the FDRA indicating that the first FD cell set and the second FD cell set are interleaved.

63. The apparatus according to claim 62, wherein, The indication is provided via the CSI report configuration or via the precoded block resource group (PRG) or subband group indicator.

64. The apparatus according to claim 63, wherein, The configuration includes an FDM scheme for CSI measurements and a combined configuration of an FDRA for the first FD unit set of the first CSI-RS resource or port group and an FDRA for the second FD unit set of the second CSI-RS resource or port group.

65. The apparatus according to claim 59, wherein, The at least one processor and the memory are further configured to: Send candidate frequency domain resource allocation (FDRA) set; and Receive an instruction for selecting an FDRA from the candidate FDRA set.

66. The apparatus according to claim 65, wherein, The indication jointly indicates the FDM scheme and its FDRA selected by the UE from the candidate scheme set.

67. The apparatus according to claim 59, wherein: The total number of precoding matrices reported in the first set of one or more PMIs is determined at least in part based on the number of subbands in the first FD unit set; and The total number of precoding matrices reported in the second set of one or more PMIs is determined at least in part based on the number of subbands in the second FD unit set.

68. The apparatus according to claim 59, wherein: If eType IICSI is applied to either the first set of the one or more PMIs or the second set of the one or more PMIs, the number of reported precoding matrices is a function of the number of subbands in the corresponding FD cell set and the configured parameters.

69. An apparatus for wireless communication by a network entity, comprising: At least one processor and memory are configured as follows: CSI-RS is transmitted according to a transmission scheme that uses at least the first channel state information CSI reference signal CSI-RS resource or port group and the second CSI-RS resource or port group. as well as Receive a precoding matrix indicator PMI report, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator LI associated with the first set of one or more PMIs, and a second LI associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

70. The apparatus according to claim 69, wherein, The transmission scheme includes spatial multiplexing (SDM).

71. The apparatus according to claim 69, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

72. The apparatus according to claim 69, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

73. An apparatus for wireless communication by a network entity, comprising: At least one processor and memory are configured as follows: The CSI report configuration is configured to send channel state information, and the CSI report configuration indicates that at least one CSI-RS resource is included in at least a first CSI reference signal CSI-RS port group and a second CSI-RS port group. Determine the CSI codebook associated with each CSI-RS port used for the precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as The system receives reports of a first PMI mapped to a port index in the first CSI-RS port group and a second PMI mapped to a port index in the second CSI-RS port group. These reports are based on PMI and CQI measurements performed by the UE using the CSI-RS port index in the corresponding CSI-RS port group and a determined CSI codebook. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

74. The apparatus according to claim 73, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

75. The apparatus according to claim 73, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

76. The apparatus according to claim 73, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

77. An apparatus for wireless communication by a user equipment (UE), comprising: A unit for configuring channel state information (CSI) reports to be received from network entities, wherein the CSI report configuration indicates at least a first CSI reference signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report; A unit for performing CSI measurements based on a Frequency Division Multiplexing (FDM) scheme, the FDM scheme including transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups, the second set of FD units being different from the first set of FD units, wherein each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs; and A unit for sending a precoded matrix indicator (PMI) report to the network entity, the PMI report indicating a first set of one or more PMIs associated with a port in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with a port in the second CSI-RS resource or port group on the second FD unit set.

78. The apparatus of claim 77, further comprising: A unit for receiving instructions on the configuration of the FDM scheme.

79. The apparatus of claim 77, further comprising: A unit used to select an FDM scheme from a set of candidate schemes; as well as A unit used to report the selected FDM scheme to the network entity.

80. The apparatus of claim 77, further comprising: A unit for receiving an indication of a frequency domain resource allocation (FDRA), wherein the FDRA indicates that the first FD unit set and the second FD unit set are interleaved.

81. The apparatus of claim 77, further comprising: Used to determine, based on actual CSI-RS transmissions, that the first FD unit set and the second FD unit set are interleaved units.

82. The apparatus of claim 77, further comprising: Units used to select candidate FDRAs for the first FD unit set and the second FD unit set from the candidate frequency domain resource allocation FDRA set; as well as A unit used to report the selected FDRA to the network entity.

83. An apparatus for wireless communication by a user equipment (UE), comprising: A unit for determining a transmission scheme for CSI reporting using at least a first channel state information CSI reference signal CSI-RS resource or port group and a second CSI-RS resource or port group; A unit for performing CSI measurements based on CSI-RS transmissions sent via at least the first CSI-RS resource or port group and the second CSI-RS resource or port group; as well as A unit for sending a Precoding Matrix Indicator (PMI) report to a network entity, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator (LI) associated with the first set of one or more PMIs, and a second layer indicator (LI) associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

84. The apparatus according to claim 83, wherein, The transmission scheme includes spatial multiplexing (SDM).

85. The apparatus according to claim 83, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

86. The apparatus according to claim 83, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

87. The apparatus according to claim 83, wherein: The first CSI measurement is performed based on the first CSI-RS resource or port group received on the first frequency domain FD cell set; and The second CSI measurement is performed based on the second CSI-RS resource or port group received on the second FD unit set.

88. An apparatus for wireless communication by a user equipment (UE), comprising: A unit for configuring the reception of Channel State Information (CSI) reports from network entities, the configuration instruction including at least one CSI-RS resource of at least a first CSI Reference Signal (CSI-RS) port group and a second CSI-RS port group; Units used to determine the CSI codebook associated with each CSI-RS port used for precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as A unit for performing PMI and CQI measurements using the determined CSI codebook with the CSI-RS port index in the corresponding CSI-RS port group, and reporting the first PMI mapped to the port index in the first CSI-RS port group and the second PMI mapped to the port index in the second CSI-RS port group. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

89. The apparatus according to claim 88, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

90. The apparatus according to claim 88, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

91. The apparatus according to claim 88, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

92. An apparatus for wireless communication by a network entity, comprising: A unit for configuring the transmission of Channel State Information (CSI) reports, wherein the CSI report configuration indicates at least a first CSI Reference Signal (CSI-RS) resource or port group and a second CSI-RS resource or port group associated with the CSI report; as well as A unit for transmitting CSI-RS based on a Frequency Division Multiplexing (FDM) scheme, the FDM scheme including transmission over a first set of Frequency Division Multiplexing (FD) units via a first CSI-RS resource or port group and transmission over a second set of FD units via a second set of CSI-RS resources or port groups, the second set of FD units being different from the first set of FD units, wherein each FD unit includes a Precoded Block Resource Group (PRG), wherein the first set of FD units includes an even number of PRGs and the second set of FD units includes an odd number of PRGs; and A unit for receiving a precoded matrix indicator (PMI) report, the PMI report indicating a first set of one or more PMIs associated with a port in the first CSI-RS resource or port group on the first FD unit set and a second set of one or more PMIs associated with a port in the second CSI-RS resource or port group on the second FD unit set.

93. The apparatus according to claim 92, further comprising: A unit used to send instructions on the configuration of the FDM scheme.

94. The apparatus of claim 92, further comprising: A unit used to send a set of candidate solutions; as well as A unit for receiving reports indicating the FDM scheme selected from the set of candidate schemes.

95. The apparatus according to claim 92, further comprising: A unit for providing an indication of a frequency domain resource allocation (FDRA), wherein the FDRA indicates that the first FD unit set and the second FD unit set are interleaved.

96. The apparatus of claim 92, further comprising: Units used for transmitting candidate frequency domain resource allocation (FDRA) sets; as well as A unit for receiving an indication of an FDRA selected from the set of candidate FDRAs.

97. An apparatus for wireless communication by a network entity, comprising: A unit for transmitting CSI-RS according to a transmission scheme using at least a first channel state information CSI reference signal CSI-RS resource or port group and a second CSI-RS resource or port group; as well as A unit for receiving a precoding matrix indicator (PMI) report, the PMI report indicating a first set of one or more PMIs associated with the first CSI-RS resource or port group, a second set of one or more PMIs associated with the second CSI-RS resource or port group, a first layer indicator (LI) associated with the first set of one or more PMIs, and a second layer indicator (LI) associated with the second set of one or more PMIs. in: The first LI indicates the strongest layer among the layers indicated by the first set of the one or more PMIs; and The second LI indicates the strongest layer among the layers indicated by the second set of the one or more PMIs.

98. The apparatus according to claim 97, wherein, The transmission scheme includes spatial multiplexing (SDM).

99. The apparatus according to claim 97, wherein, The transmission scheme includes Time Division Multiplexing (TDM).

100. The apparatus according to claim 97, wherein, The transmission scheme includes Frequency Division Multiplexing (FDM).

101. The apparatus according to claim 97, wherein: The first CSI measurement is performed based on the first CSI-RS resource or port group received on the first frequency domain FD cell set; and The second CSI measurement is performed based on the second CSI-RS resource or port group received on the second FD unit set.

102. An apparatus for wireless communication by a network entity, comprising: A unit for transmitting Channel State Information (CSI) report configuration, wherein the CSI report configuration indication includes at least one CSI-RS resource of at least a first CSI reference signal CSI-RS port group and a second CSI-RS port group; Units used to determine the CSI codebook associated with each CSI-RS port used for precoding matrix indicator PMI and channel quality indicator CQI measurements; as well as A unit for reporting a first PMI mapped to a port index in the first CSI-RS port group and a second PMI mapped to a port index in the second CSI-RS port group, the reporting being based on PMI and CQI measurements performed by the UE using the CSI-RS port index in the corresponding CSI-RS port group and using a determined CSI codebook. The CQI measurement depends at least in part on the transmission scheme used for CSI RS reporting.

103. The apparatus according to claim 102, wherein, If the transmission scheme includes a spatial division multiplexing (SDM) scheme, the UE calculates the CQI based on a first mapping from a first layer set to a first CSI-RS port group with a first index via a first precoding matrix indicated by a first PMI and a second mapping from a second layer set to a second CSI-RS port group with a second index via a second precoding matrix indicated by a second PMI, assuming a physical downlink shared channel (PDSCH).

104. The apparatus according to claim 103, wherein, If the transmission scheme includes a Frequency Division Multiplexing (FDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first frequency domain FD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second FD unit set.

105. The apparatus according to claim 102, wherein, If the transmission scheme includes a Time Division Multiplexing (TDM) scheme, the UE calculates the CQI based on the following, assuming a Physical Downlink Shared Channel (PDSCH): The first PMI maps the first layer to the first CSI-RS port group on the first time-domain TD cell set; and The second PMI maps the second layer to the second CSI-RS port group on the second TD unit set.

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