Channel state information precoding permutations
By applying permutations to precoding parameters and indices, the mapping of CSI-RS resources to antenna arrays is optimized, addressing ambiguity and enhancing communication quality and reliability in wireless systems.
Patent Information
- Application Number
- PCT/CN2024/083735
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-10-02
AI Technical Summary
Existing wireless communication systems face challenges in efficiently mapping channel state information reference signals (CSI-RS) to antenna arrays, particularly when multiple CSI-RS resources share the same quasi co-location parameter and port quantities, leading to ambiguity and reduced communication quality.
Applying a permutation operation to precoding parameters, including port indices and precoder row indices of a precoding matrix, to reorder and reorganize mapping patterns, and using joint indices to clarify the association between CSI-RS resources and port indices, thereby improving CSI-RS reporting.
This approach reduces ambiguity and enhances communication quality and reliability by optimizing the mapping of CSI-RS resources to antenna arrays, leading to improved channel state information reporting.
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Figure CN2024083735_02102025_PF_FP_ABST
Abstract
Description
CHANNEL STATE INFORMATION PRECODING PERMUTATIONS
[0001] FIELD OF TECHNOLOGY
[0002] The following relates to wireless communications at a user equipment (UE) , including channel state information precoding permutations.BACKGROUND
[0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .SUMMARY
[0004] The described techniques relate to improved methods, systems, devices, and apparatuses that support channel state information (CSI) precoding permutations. For example, a user equipment (UE) may receive multiple CSI reference signals, which may be transmitted via multiple CSI reference signal (CSI-RS) resources. In such situations, each CSI-RS resource of the plurality of CSI-RS resources may be associated with multiple ports. Further, the plurality of CSI-RS resources may share a same quasi co-location parameter (e.g., because the plurality of CSI-RS resource may be associated with a same transmission / reception point (TRP) ) , and a first quantity of ports associated with the plurality of CSI-RS resources may be the same as or correspond to a second quantity of ports indicated in a codebook configured for the UE. In some examples, the UE may in turn generate a CSI report in accordance with the codebook and a permutation. The permutation may be applied to precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix. For example, the permutation may be applied to the plurality of port indices or to the plurality of precoder row indices. Such a permutation may result in an organization of the precoding parameters based on their relation to the multiple CSI-RS resource. The UE may then transmit the generated CSI report (e.g., to a network entity that transmitted the CSI-RSs) .
[0005] A method for wireless communications by a UE is described. The method may include receiving a set of multiple CSI-RSs via a set of multiple CSI-RS resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE, generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix, and transmitting the generated CSI report.
[0006] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to receive a set of multiple CSI reference signals via a set of multiple CSI-RS resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE, generate a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix, and transmit the generated CSI report.
[0007] Another UE for wireless communications is described. The UE may include means for receiving a set of multiple CSI reference signals via a set of multiple CSI-RS resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE, means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix, and means for transmitting the generated CSI report.
[0008] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive a set of multiple CSI reference signals via a set of multiple CSI-RS resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE, generate a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix, and transmit the generated CSI report.
[0009] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for applying the permutation to the set of multiple port indices to obtain a set of multiple groups of port indices, where each group of port indices may be collectively associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, and where each port index in each group of port indices may be individually associated with a respective second port index of a set of multiple second port indices that may be specific to the respective CSI-RS resource with which the group of port indices may be collectively associated and assigning respective joint indices to respective port indices of the set of multiple port indices, each respective joint index including a first sub-index and a second sub-index, where the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and where the second sub-index indicates the respective second port index associated with the respective port index.
[0010] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for applying the permutation to the precoding matrix, the permutation including a row-wise permutation of the precoding matrix, where the set of multiple precoding parameters include the precoding matrix.
[0011] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, applying the permutation to the precoding matrix may include operations, features, means, or instructions for applying a permutation matrix to the precoding matrix, where applying the permutation matrix organizes the set of multiple precoder row indices into a set of multiple groups of precoder row indices, where each group of precoder row indices may be collectively associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, and where each precoder row index in each group of precoder row indices may be individually associated with a respective second index of a set of multiple second port indices that may be specific to the respective CSI-RS resource with which the group of precoder row indices may be collectively associated.
[0012] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a size of the permutation matrix corresponds to the first quantity of ports associated with the set of multiple CSI-RS resources.
[0013] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the ports associated with the set of multiple CSI-RS resources may be mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme including a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension, respective first dimensional indices of the set of multiple first dimensional indices may be associated with a single CSI-RS resource, and respective second dimensional indices of the set of multiple second dimensional indices may be associated with multiple CSI-RS resources.
[0014] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the ports associated with the set of multiple CSI-RS resources may be mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme indicating a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension, respective first dimensional indices of the set of multiple first dimensional indices may be each associated with multiple CSI-RS resources, and respective second dimensional indices of the set of multiple second dimensional indices may be associated with a single CSI-RS resource.
[0015] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the ports associated with the set of multiple CSI-RS resources may be mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme indicating a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension, respective first dimensional indices of the set of multiple first dimensional indices may be each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources, and respective second dimensional indices of the set of multiple second dimensional indices may be associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.
[0016] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the ports associated with the set of multiple CSI-RS resources may be mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme including a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension, the two-dimensional mapping scheme indicating an incrementation of the set of multiple precoder row indices along the set of multiple second dimensional indices for each first dimensional index.
[0017] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the mapping may be performed across multiple polarizations associated with the set of multiple CSI-RS resources.
[0018] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the set of multiple ports associated with each CSI-RS resource includes up to 32 ports.BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 shows an example of a wireless communications system that supports channel state information (CSI) precoding permutations in accordance with one or more examples as disclosed herein.
[0020] FIG. 2 shows an example of a wireless communications system that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0021] FIG. 3 shows an example of a mapping scheme that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0022] FIG. 4 shows an example of a mapping scheme that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0023] FIG. 5 shows an example of a mapping scheme that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0024] FIG. 6 shows an example of a process flow that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0025] FIGs. 7 and 8 show block diagrams of devices that support CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0026] FIG. 9 shows a block diagram of a communications manager that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0027] FIG. 10 shows a diagram of a system including a device that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0028] FIGs. 11 through 13 show flowcharts illustrating methods that support CSI precoding permutations in accordance with one or more examples as disclosed herein.DETAILED DESCRIPTION
[0029] In some wireless communications, a network entity may gather channel condition information from a user equipment (UE) to efficiently configure the channel between the UE and the network entity. This information may be sent from the UE in the form of a channel state information (CSI) report. A CSI report may contain a rank indicator (RI) requesting a quantity of layers to be used for downlink transmissions, a precoding matrix indicator (PMI) indicating a preference for which precoder matrix should be used (e.g., based on a quantity of layers) , and / or a channel quality indicator (CQI) representing a highest modulation and coding scheme (MCS) that may be used. The CSI report may be based on the reception of reference signals, such as CSI reference signals (CSI-RSs) by the UE. In some cases, channel state information CSI-RS aggregation may be employed, in which CSI-RSs may be transmitted across multiple CSI-RS resources and may employ relatively larger quantities of ports (e.g., greater than 32 antenna ports) . However, in some such scenarios, each CSI-RS resource may support 32 or fewer ports per resource. As such, techniques that enable an improved mapping of CSI-RS resources to antenna arrays may be desirable to support improved CSI-RS reporting associated with such CSI-RS aggregation.
[0030] As described herein, techniques for improved CSI-RS resource mapping may be employed. For example, in some situations (e.g., those in which a configured codebook may include a quantity of ports that is the same as (e.g., equal to) a quantity of ports associated with multiple CSI-RS resources, and the multiple CSI-RS resources share a same quasi co-location (QCL) parameter, a permutation operation may be applied to one or more precoding parameters. Such precoding parameters may be associated with a second stage of a three-stage mapping procedure in which port indices (e.g., that were mapped from time-frequency-code resources of CSI-RSs) are mapped to precoder row indices (e.g., that may be further mapped to antenna array physical indices) . For example, a permutation operation may be applied to the port indices to reorder or reorganize the port indices to achieve different mapping patterns or segmentations. In some such cases, a joint index including a CSI-RS resource index and a port index within a CSI-RS resource may be added to the permutated port indices. Additionally, or alternatively, a precoding matrix may be permutated to reorder or reorganize the precoding row indices of the precoding matrix. In this way, ambiguity of operation may be reduced or eliminated, resulting in increased communications quality and reliability.
[0031] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are then described with reference to a wireless communications system, mapping schemes, and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to CSI precoding permutations.
[0032] FIG. 1 shows an example of a wireless communications system 100 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0033] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0034] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0035] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
[0036] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0037] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0038] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a TRP. One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0039] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0040] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0041] For instance, an access network (AN) or RAN may include communications between access nodes (e.g., an IAB donor) , IAB node (s) 104, and one or more UEs 115. The IAB donor may facilitate connection between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130) . That is, an IAB donor may refer to a RAN node with a wired or wireless connection to the core network 130. The IAB donor may include one or more of a CU 160, a DU 165, and an RU 170, in which case the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link) . The IAB donor and IAB node (s) 104 may communicate via an F1 interface according to a protocol that defines signaling messages (e.g., an F1 AP protocol) . Additionally, or alternatively, the CU 160 may communicate with the core network 130 via an interface, which may be an example of a portion of a backhaul link, and may communicate with other CUs (e.g., including a CU 160 associated with an alternative IAB donor) via an Xn-C interface, which may be an example of another portion of a backhaul link.
[0042] IAB node (s) 104 may refer to RAN nodes that provide IAB functionality (e.g., access for UEs 115, wireless self-backhauling capabilities) . A DU 165 may act as a distributed scheduling node towards child nodes associated with the IAB node (s) 104, and the IAB-MT may act as a scheduled node towards parent nodes associated with IAB node (s) 104. That is, an IAB donor may be referred to as a parent node in communication with one or more child nodes (e.g., an IAB donor may relay transmissions for UEs through other IAB node (s) 104) . Additionally, or alternatively, IAB node (s) 104 may also be referred to as parent nodes or child nodes to other IAB node (s) 104, depending on the relay chain or configuration of the AN. The IAB-MT entity of IAB node (s) 104 may provide a Uu interface for a child IAB node (e.g., the IAB node (s) 104) to receive signaling from a parent IAB node (e.g., the IAB node (s) 104) , and a DU interface (e.g., a DU 165) may provide a Uu interface for a parent IAB node to signal to a child IAB node or UE 115.
[0043] For example, IAB node (s) 104 may be referred to as parent nodes that support communications for child IAB nodes, or may be referred to as child IAB nodes associated with IAB donors, or both. An IAB donor may include a CU 160 with a wired or wireless connection (e.g., backhaul communication link (s) 120) to the core network 130 and may act as a parent node to IAB node (s) 104. For example, the DU 165 of an IAB donor may relay transmissions to UEs 115 through IAB node (s) 104, or may directly signal transmissions to a UE 115, or both. The CU 160 of the IAB donor may signal communication link establishment via an F1 interface to IAB node (s) 104, and the IAB node (s) 104 may schedule transmissions (e.g., transmissions to the UEs 115 relayed from the IAB donor) through one or more DUs (e.g., DUs 165) . That is, data may be relayed to and from IAB node (s) 104 via signaling via an NR Uu interface to MT of IAB node (s) 104 (e.g., other IAB node (s) ) . Communications with IAB node (s) 104 may be scheduled by a DU 165 of the IAB donor or of IAB node (s) 104.
[0044] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support test as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0045] A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0046] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0047] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0048] In some examples, such as in a carrier aggregation configuration, a carrier may have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) ) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different RAT) .
[0049] The communication link (s) 125 of the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
[0050] A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular RAT (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
[0051] Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
[0052] One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
[0053] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
[0054] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0055] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0056] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0057] A network entity 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a network entity 105 (e.g., using a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) . In some examples, a cell also may refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with coverage areas 110, among other examples.
[0058] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a network entity 105 operating with lower power (e.g., a base station 140 operating with lower power) relative to a macro cell, and a small cell may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A network entity 105 may support one or more cells and may also support communications via the one or more cells using one or multiple component carriers.
[0059] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
[0060] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0061] The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base stations 140) may have similar frame timings, and transmissions from different network entities (e.g., different ones of the network entities 105) may be approximately aligned in time. For asynchronous operation, network entities 105 may have different frame timings, and transmissions from different network entities (e.g., different ones of network entities 105) may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.
[0062] Some UEs 115, such as MTC or IoT devices, may be relatively low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) . M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a network entity 105 (e.g., a base station 140) without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that uses the information or presents the information to humans interacting with the application program. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
[0063] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception concurrently) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 may include entering a power saving deep sleep mode when not engaging in active communications, operating using a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
[0064] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
[0065] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0066] In some systems, a D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) . In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., network entities 105, base stations 140, RUs 170) using vehicle-to-network (V2N) communications, or with both.
[0067] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
[0068] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0069] The wireless communications system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz, also known as the centimeter band, or using an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the network entities 105 (e.g., base stations 140, RUs 170) , and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, such techniques may facilitate using antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
[0070] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0071] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
[0072] The network entities 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , for which multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , for which multiple spatial layers are transmitted to multiple devices.
[0073] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
[0074] A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.
[0075] Some signals, such as data signals associated with a particular receiving device, may be transmitted by a transmitting device (e.g., a network entity 105 or a UE 115) along a single beam direction (e.g., a direction associated with the receiving device, such as another network entity 105 or UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted along one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the network entity 105 along different directions and may report to the network entity 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
[0076] In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a CSI-RS) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a PMI or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .
[0077] A receiving device (e.g., a UE 115) may perform reception operations in accordance with multiple receive configurations (e.g., directional listening) when receiving various signals from a transmitting device (e.g., a network entity 105) , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may perform reception in accordance with multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
[0078] A QCL relationship between one or more transmissions or signals may refer to a relationship between the antenna ports (and the corresponding signaling beams) of the respective transmissions. For example, one or more antenna ports may be implemented by a network entity 105 for transmitting at least one or more reference signals (such as a downlink reference signal, a synchronization signal block (SSB) , or the like) and control information transmissions to a UE 115. However, the channel properties of signals sent via the different antenna ports may be interpreted (e.g., by a receiving device) to be the same (e.g., despite the signals being transmitted from different antenna ports) , and the antenna ports (and the respective beams) may be described as being quasi co-located (QCLed) . QCLed signals may enable the UE 115 to derive the properties of a first signal (e.g., delay spread, Doppler spread, frequency shift, average power) transmitted via a first antenna port from measurements made on a second signal transmitted via a second antenna port. Put another way, if two antenna ports are categorized as being QCLed in terms of, for example, delay spread then the UE 115 may determine the delay spread for one antenna port (e.g., based on a received reference signal, such as CSI-RS) and then apply the result to both antenna ports. Such techniques may avoid the UE 115 determining the delay spread separately for each antenna port. In some cases, two antenna ports may be said to be spatially QCLed, and the properties of a signal sent over a directional beam may be derived from the properties of a different signal over another, different directional beam. That is, QCL relationships may relate to beam information for respective directional beams used for communications of various signals.
[0079] Different types of QCL relationships may describe the relationship between two different signals or antenna ports. For instance, QCL-TypeA may refer to a QCL relationship between signals including Doppler shift, Doppler spread, average delay, and delay spread. QCL-TypeB may refer to a QCL relationship including Doppler shift and Doppler spread, whereas QCL-TypeC may refer to a QCL relationship including Doppler shift and average delay. A QCL-TypeD may refer to a QCL relationship of spatial parameters, which may indicate a relationship between two or more directional beams used to communicate signals. Here, the spatial parameters may indicate that a first beam used to transmit a first signal may be similar (or the same) as another beam used to transmit a second, different, signal, or, that the same receive beam may be used to receive both the first and the second signal. Thus, the beam information for various beams may be derived through receiving signals from a transmitting device, where, in some cases, the QCL information or spatial information may help a receiving device efficient identify communications beams (e.g., without having to sweep through a large quantity of beams to identify a beam (e.g., the beam having a highest signal quality) ) . In addition, QCL relationships may exist for both uplink and downlink transmissions and, in some cases, a QCL relationship may also be referred to as spatial relationship information.
[0080] In some examples, TCI states may include one or more parameters associated with a QCL relationship between transmitted signals. For example, each TCI state includes parameters for configuring a QCL relationship between one or two downlink reference signals and the DMRS ports of PDSCH, the DMRS port of PDCCH or the CSI-RS port (s) of a CSI-RS resource. The QCL relationship is configured by a first higher layer parameter for the first downlink reference signal, and by a second higher layer parameter for the second downlink reference signal (if configured) . That is, a network entity 105 may configure a QCL relationship that provides a mapping between a reference signal and antenna ports of another signal, and the TCI state may be indicated to the UE 115 by the network entity 105. In some cases, a set of TCI states (e.g., a list of TCI states) may be indicated to a UE 115 via RRC signaling, where some quantity of TCI states may be configured via RRC and one or more TCI states may be indicated (e.g., activated) via a medium access control (MAC) -control element (MAC-CE) , and further indicated via DCI (e.g., within a CORESET) . The QCL relationship associated with the TCI state (and further established through higher-layer parameters) may provide the UE 115 with the QCL relationship for respective antenna ports and reference signals transmitted by the network entity 105.
[0081] The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
[0082] The UEs 115 and the network entities 105 may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly via a communication link (e.g., the communication link (s) 125, a D2D communication link 135) . HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in relatively poor radio conditions (e.g., low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific slot for data received via a previous symbol in the slot. In some other examples, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
[0083] In some implementations, a UE 115 may support a mapping procedure according to which the UE 115 may map ports indices associated with multiple CSI-RS resources to precoding matrix row indices. For example, the UE 115 may receive multiple (e.g., aggregated) CSI-RS transmissions over multiple CSI-RS resources, and each CSI-RS resource may be associated with multiple ports (e.g., up to 32 antenna ports) such that all of the CSI-RS resources are associated with a set of ports that are to be considered for generation of the CSI report by the UE. The UE may generate the CSI report by applying a permutation to the port indices of the CSI-RS resources or the row indices of the precoding matrix to organize either set of indices by association with CSI-RS resources and CSI-RS resource-specific indices. The UE may then transmit the CSI report in accordance with the permutation applied to the indices (e.g., the port indices of the CSI-RS resources or the row indices of the precoding matrix) .
[0084] FIG. 2 shows an example of a wireless communications system 200 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. In some examples, the UE 115-a may be located in a geographic coverage area 110-a that may be associated with the network entity 105-a. The network entity 105-a and UE 115-a may communicate via one or more downlink communication links 205-a and one or more uplink communication links 205-b.
[0085] In some wireless communications scenarios, a wireless communications system (e.g., such as the wireless communications system 200) may support CSI information operations for greater quantities of ports than in other scenarios. For example, a wireless communications system may support CSI operations for up to 128 CSI-RS ports (e.g., which may be associated with a frequency range, such as FR1) . In some examples, modifications or improvements involving codebook refinement (e.g., Type-I codebook refinement or modifications, Type-II codebook refinement or modifications, one or more other refinements or modifications, or any combination thereof) may support greater quantities of ports than other approaches (e.g., 128 CSI-RS ports across multiple resources) .
[0086] In some cases, individual CSI-RS resources may support a quantity of ports (e.g., up to 32 CSI-Rs ports) that is less than a quantity of resources supported across the multiple resources. For example, in some scenarios involving massive multiple input multiple output (MIMO) scenarios (e.g., 5G NR massive MIMO) , CSI operations (e.g., for digital beamforming) may support up to 32 antenna ports. In examples involving some frequency ranges, such as low-band FR1, a relatively smaller quantity of ports may be employed (e.g., due to antenna array size, form factor, or other considerations) . Similarly, in some examples involving other frequency ranges, such as FR2, a relatively smaller quantity of ports may be employed (e.g., due to hardware cost or other considerations) . Further, in some scenarios, such as those involving relatively narrow analog beams implemented with a large phased-array (e.g., a 1024-element array) , a relatively smaller quantity of ports may be sufficient.
[0087] However, in some examples, such as higher-band frequency range 1 (FR1) (e.g., 3–6 GHz) or frequency range 3 (FR3) (e.g., 7–24 GHz) , a relatively greater quantity of ports may be employed. For example, middle-band operations may involve larger quantities of ports (e.g., greater than 32 ports) . For example, for operations in a 6 GHz band, a quantity of transmitter receiver units (TXRUs) may be increased (e.g., to 128 TXRUs) . Similarly, over a 3 GHz band, a corresponding quantity of TXRUs may also be increased (e.g., 64 TXRUs) . These and other examples may employ increased quantities of TXRUs with a same form factor size of an antenna array. For example, in some cases, a quantity of total ports may be determined, selected, or expressed in association with two parameters associated with a quantity of antenna elements in an antenna array, N1 and N2, where a total quantity of ports to be employed may be expressed as 2N1N2. Table 1 herein shows some examples of the total quantity of antenna ports for various combinations of N1 and N2:
[0088] Table 1
[0089] In some examples, techniques for CSI-RS port mapping may be spread across various mapping stages. For instance, in what may be referred to as a first stage (e.g., “Stage 1” ) , time-frequency-code CSI resources of CSI-RS may be mapped to a port index p in associated with a CSI-RS resource pattern. For example, given a CSI-RS resource with P ports, a port index p may be denoted as p=0, 1, ..., P-1. A code-division multiplexing (CDM) group size as may be denoted as L, a CDM group index jmay be denoted as and an index within a CDM group may be denoted as s=0, 1, ..., L-1. Thus, a port index p may be mapped to the CSI-RS resources as expressed by p=3000+s+jL. Such a mapping may be characterized as being a “innermost” to “outermost” indexing: the mapping is first performed within the CDM group (s) , then over CDM groups (j) .
[0090] In some examples, what may be referred to as a second stage (e.g., “Stage 2” ) of CSI-RS port mapping may include mapping the port index p to a precoder row index q. For example, such a mapping may be expressed as shown in Equation 1 herein, in which the precoding matrix W (i) includes rows indexed as q=0, ..., P-1 and columns indexed as l=0, ..., v-1, where v represents the rank.
[0091] In some examples, in what may be referred to as a third stage (e.g., “Stage 3”) of CSI-RS port mapping may include mapping the precoder row index q to an antenna array “physical” index (n1, n2, pol) . Such a mapping may be defined or expressed via a codebook (e.g., that includes or is associated with PMI formulas) . For example, using an “innermost” to “outermost” indexing, where n2 may be expressed as n2=0, 1, ..., N2-1, n1 may be expressed as n1=0, 1, ..., N1-1, and a polarization parameter pol may be expressed as pol=0, 1. Such a mapping in a third stage may be expressed as q=pol·N1N2+n1N2+n2. Such a mapping may involve a Type-I PMI (e.g., a rank 1 precoder) in which In some examples, vl, m may be expressed as Equations 2 and 3 as shown herein.
[0092] In some implementations, a quantity of ports associated with each CSI-RS resource may not be expanded (e.g., such a quantity of ports may be 32 ports or another quantity already associated with CSI-RS resources) . As such, aggregation techniques to support overall higher quantities of ports may be employed. For example, 64-port or 128-port implementations or scenarios may involve aggregation of multiple CSI-RS resources, where each CSI-RS resource may include a quantity of ports (e.g., up to 32 ports) .
[0093] However, in such scenarios, existing port mapping techniques may be improved. The techniques described herein relate to improved CSI-RS port mapping, such as improved “Stage 2” port mapping techniques.
[0094] For example, the network entity 105-a and the UE 115-a may operate in accordance with such port mapping techniques. For example, the network entity 105-a may transmit a CSI-RS 220 or multiple such CSI-RSs 220 to the UE 115-a and the UE 115-a may prepare the CSI report 225 in response. In association with preparing the CSI report 225, the UE 115-a may perform, select, determine, or express a mapping 255 between the port indices 240 associated with the CSI-RS resources 230 (e.g., CSI-RS resource 230-a and CSI-RS resource 230-b) via which the CSI-RSs 220 are transmitted and the precoder row indices 245 associated with the precoding matrix 250. For example, in some scenarios, the codebook 260 may be configured with a quantity of ports that corresponds with or is equal to a quantity of the ports 235 associated with the CSI-RS resources 230 (e.g., more than one CSI-RS resource 230) that are associated with the CSI (e.g., a total of 64 ports, corresponding to two 32-port CSI-RS resources 230, a total of 128 ports, corresponding to four 32-port CSI-RS resources 230, among other examples) . In some examples, such a quantity may be equal to K·P, where Pdenotes a quantity of ports per CSI-RS resource, and where the K CSI-RS resources have a same QCL parameter, as the CSI-RS aggregation scenario described here involves a single TRP, which, in some cases, may be different than a coherent joint transmission (CJT) scenario involving multiple TRPs.
[0095] In association with preparing the CSI report 225, the UE 115-a may apply a permutation 265 to one or parameters (e.g., precoding parameters) to perform one or more precoding operations or calculations involving a CQI, a RI, a PMI, or any combination thereof in connection with determining, selecting, obtaining, or expressing the mapping 255 between the port indices 240 and the precoder row indices 245. For example, the UE 115-a may apply the permutation 265 to the port indices 240, the precoder row indices 245, or any combination thereof.
[0096] For example, the UE 115-a may apply the permutation 265 to the port indices 240 to produce port indices 240 that may be expressed as shown in Equation 4 herein, in which a row index q expressed as q=0, 1, ..., KP-1 bears a joint index. The joint index (e.g., {σq, ρq} ) may permute both a CSI-RS resource 230 index k=0, 1, ..., K-1 into σq∈ {0, 1, ..., K-1} , where q=0, 1, ..., KP-1, as well as a CSI-RS resource-specific port index p=0, 1, ..., P-1 into ρq∈ {0, 1, ..., P-1} , where q=0, 1, ..., KP-1.
[0097] The joint index may reflect the permutation performed on the port indices 240 that reorganizes the port indices in groups. For example, each group may be associated with a CSI-RS resource 230, which association may be expressed by a first portion of the joint index. Further, each group of port indices 240 is further indexed according to a port index that is specific to the CSI-RS resource 230 that is associated with the group. In other words, each CSI-RS resource 230 is associated with a separate set of indices which are applied to the permutated port indices 240 that belong to the group associated with the CSI-RS resource 230.
[0098] In some examples, a mapping resulting from permutating the port indices 240 may result in various mapping results (e.g., associated with segmentation schemes) as described herein (e.g., as in FIGs. 3, 4, and 5 and associated descriptions) .
[0099] Additionally, or alternatively, the UE 115-a may apply the permutation 265 to the precoder row indices 245. For example, the UE 115-a may apply a permutation matrix 270 to the precoding matrix 250 to produce a row-wise permuted precoding matrix. Such an operation may be expressed by where W (i) represents the precoding matrix 250, Perm () represents the application of the permutation matrix 270, and represents the row-wise permuted precoding matrix. Such an application of the permutation matrix 270 may result in an organization of the precoder row indices 245 into groups. Each group of precoder row indices 245 may be associated (e.g., collectively) with a CSI-RS resource. Further, each precoder row index 245 of each group of precoder row indices 245 may be associated with an index that is specific to the CSI-RS resource 230 with which the containing group is associated. In this way, the port indices 240 may be mapped to the precoder row indices 245. Equation 5 herein shows the result of the application of the permuted precoding matrix 250 to the port indices 240, showing the groups and related indices.
[0100] In some examples, such a row-wise permutation may be achieved via the permutation matrix 270 as expressed by where W (i) is the precoder according to a reported PMI, and S is a permutation matrix. In some examples, the permutation matrix S may have a size of KP×KP, with a KP quantity of entries as “1” located in different rows and different columns, while other remaining entries as “0” . In such an example, each “1” located at an “i-th” row and a “j-th” column of S (e.g., expressed as S (i, j) =1) would move the “j-th” row of W (i) to be “i-th” row of In some examples, the permutation matrix permutes each “q” -th row of W (i) to be “σqP+ρq” -th row of for q=0, 1, ..., KP-1. In other words, the permutation matrix 270 S satisfies that for q=0, 1, ..., KP-1 (e.g., while other remaining entries are “0” ) . A mapping resulting from applying the permutation matrix 270 may result in various mapping results (e.g., associated with segmentation schemes) as described herein (e.g., as in FIGs. 3, 4, and 5 and associated descriptions) .
[0101] FIG. 3 shows an example of a mapping scheme 300 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0102] The mapping scheme 300 is an example two-dimensional mapping scheme that includes a first dimension designated as an N1 dimension (e.g., labeled by N1) and a second dimension expressed as an N2 dimension (e.g., labeled by N2) . The mapping scheme 300 may express a mapping between the CSI-RS resource-specific port indices 320, which are expressed as ρq, and the port indices, which are represented as q. Such a mapping may also include or be associated with indices of multiple CSI-RS resources, which are expressed as σq, as well as multiple polarizations (e.g., which may alternatively be expressed as a third dimension in some cases) . In the mapping scheme 300, an order or sequence of mapping respective ports (e.g., port indices, as indicated by the arrows) may achieved based on segmentation of CSI-RS resources in the N1dimension.
[0103] The mapping scheme 300 may indicate CSI-RS resource-specific port indices 320 that may be expressed as σq=0, 1, ..., K-1. Each CSI-RS resource may be associated with an equal quantity of ports expressed as P, and the CSI-RS resource- specific port indices 320 may be expressed as ρq=0, 1, ..., P-1. A CSI-RS resource-specific port index 320 may be expressed as ρq=sP+jL, where L denotes a CDM group size of each CSI-RS resource, denotes a CDM group index, and s=0, 1, ..., L-1 denotes an index within a CDM group. The precoder row indices 325 may also be expressed as q∈ {0, 1, ..., KP-1} .
[0104] In the mapping scheme 300, the parameter K (e.g., that represents the quantity of CSI-RS resources associated with the mapping scheme) may be 2, indicating that two CSI-RS resources are associated with the mapping scheme 300. In the mapping scheme 300, each CSI-RS resource is associated with P=32 ports. In the mapping scheme 300, the parameter N1=8 and N2=4. In some examples, the mapping scheme 300 may be split as N1, k=4 and N2, k=4.
[0105] In some examples, the mapping scheme 300 may indicate a one-dimensional segmentation along the N1 dimension as expressed by Equation 6 herein. For example, as shown in FIG. 3, indices along the N1 dimension may be associated with a single CSI-RS resource (e.g., CSI-RS resource #0 or CSI-RS resource #1) and indices along the N2 dimension may be associated with multiple CSI-RS resources (e.g., CSI-RS resource #0 and CSI-RS resource #1) .
[0106] FIG. 4 shows an example of a mapping scheme 400 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0107] The mapping scheme 400 is an example two-dimensional mapping scheme that includes a first dimension designated as an N1 dimension (e.g., labeled by N1) and a second dimension expressed as an N2 dimension (e.g., labeled by N2) . The mapping scheme 400 may express a mapping between the CSI-RS resource-specific port indices 420, which are expressed as ρq, and the port indices, which are represented as q. Such a mapping may also include or be associated with indices of multiple CSI-RS resources, which are expressed as σq, as well as multiple polarizations (e.g., which may alternatively be expressed as a third dimension in some cases) . In the mapping scheme 400, an order or sequence of mapping respective ports (e.g., port indices, as indicated by the arrows) may achieved based on segmentation of CSI-RS resources in the N2dimension.
[0108] The mapping scheme 400 may indicate CSI-RS resource-specific port indices 420 that may be expressed as σq=0, 1, ..., K-1. Each CSI-RS resource may be associated with an equal quantity of ports expressed as P, and the CSI-RS resource-specific port indices 420 may be expressed as ρq=0, 1, ..., P-1. A CSI-RS resource-specific port index 420 may be expressed as ρq=s+jL, where L denotes a CDM group size of each CSI-RS resource, denotes a CDM group index, and s=0, 1, ..., L-1 denotes an index within a CDM group. The precoder row indices 425 may also be expressed as q∈ {0, 1, ..., KP-1} .
[0109] In the mapping scheme 400, the parameter K (e.g., that represents the quantity of CSI-RS resources associated with the mapping scheme) may be 2, indicating that two CSI-RS resources are associated with the mapping scheme 400. In the mapping scheme 400, each CSI-RS resource is associated with P=32 ports. In the mapping scheme 400, the parameter N1=8 and N2=4. In some examples, the mapping scheme 400 may be split as N1, k=8 and N2, k=2.
[0110] In some examples, the mapping scheme 400 may indicate a one-dimensional segmentation along the N2 dimension as expressed by Equation 7 herein. For example, as shown in FIG. 4, indices along the N2 dimension may be associated with multiples CSI-RS resources (e.g., CSI-RS resource #0 and CSI-RS resource #1) and indices along the N2 dimension may be associated with a single CSI-RS resource (e.g., CSI-RS resource #0 or CSI-RS resource #1) .
[0111] In examples in which K=N2 (e.g., where each subarray with an N2-dimension size of ) , the segmenting may be expressed as q=ρqK+σq.
[0112] FIG. 5 shows an example of a mapping scheme 500 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein.
[0113] The mapping scheme 500, which is an example two-dimensional mapping scheme that includes a first dimension designated as an N1 dimension (e.g., labeled by N1) and a second dimension expressed as an N2 dimension (e.g., labeled by N2) . The mapping scheme 500 may express a mapping between the CSI-RS resource-specific port indices 520, which are expressed as ρq, and the port indices, which are represented as q. Such a mapping may also include or be associated with indices of multiple CSI-RS resources, which are expressed as σq, as well as multiple polarizations (e.g., which may alternatively be expressed as a third dimension in some cases) . In the mapping scheme 500, an example of an order or sequence of mapping respective ports (e.g., port indices, as indicated by the arrows) may achieved based on a split of CSI-RS resources between the N1 and the N2 dimensions.
[0114] The mapping scheme 500 may indicate CSI-RS resource-specific port indices 520 that may be expressed as σq=0, 1, ..., K-1. Each CSI-RS resource may be associated with an equal quantity of ports expressed as P, and the CSI-RS resource-specific port indices 520 may be expressed as ρq=0, 1, ..., P-1. A CSI-RS resource-specific port index 520 may be expressed as ρq=s+jL, where L denotes a CDM group size of each CSI-RS resource, denotes a CDM group index, and s=0, 1, ..., L-1 denotes an index within a CDM group. The precoder row indices 525 may also be expressed as q∈ {0, 1, ..., KP-1} .
[0115] In the mapping scheme 500, the parameter K (e.g., that represents the quantity of CSI-RS resources associated with the mapping scheme) may be 4 (e.g., K1=2 and K2=2 indicating the subarrays that are created) , indicating that four CSI-RS resources are associated with the mapping scheme 500. In the mapping scheme 500, each CSI-RS resource is associated with P=16 ports. In the mapping scheme 500, the parameter N1=8 and N2=4. In some examples, the mapping scheme 500 may be split as N1, k=4 and N2, k=2.
[0116] In some examples, the mapping scheme 500 may indicate a two-dimensional segmentation along the N1 dimension and the N2 dimension as expressed by Equation 8 herein. In Equation 8, K1, K2 indicate the quantity of subarrays in each dimension and K=K1K2, and the CSI-RS index (subarray index) is expressed as σq=σq, 1K2+σq, 2, σq, 1=0, 1, ..., K1-1, σq, 2=0, 1, ..., K2-1.
[0117] For example, as shown in FIG. 5, the mapping scheme 500 may include indices along the N1 dimension that are associated with a first subset of CSI-RS resources (e.g., CSI-RS resource #0 and CSI-RS resource #1, or CSI-RS resource #2 and CSI-RS resource #3) and indices along the N2 dimension that are associated with a second subset of CSI-RS resources (e.g., CSI-RS resource #0 and CSI-RS resource #2, or CSI-RS resource #1 and CSI-RS resource #3) .
[0118] FIG. 6 shows an example of a process flow 600 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The process flow 600 may implement various aspects of the present disclosure described herein. The elements described in the process flow 600 (e.g., UE 115-b and network entity 105-b) may be examples of similarly named elements described herein.
[0119] In the following description of the process flow 600, the operations between the various entities or elements may be performed in different orders or at different times. Some operations may also be left out of the process flow 600, or other operations may be added. Although the various entities or elements are shown performing the operations of the process flow 600, some aspects of some operations may also be performed by other entities or elements of the process flow 600 or by entities or elements that are not depicted in the process flow, or any combination thereof.
[0120] At 620, the UE 115-b may receive a plurality of CSI-RSs via a plurality of CSI-RS resources, each CSI-RS resource of the plurality of CSI-RS resources associated with a plurality of ports and the plurality of CSI-RS resources share a same quasi co-location parameter, and wherein a first quantity of ports associated with the plurality of CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE.
[0121] At 625, the UE 115-b may apply the permutation to the plurality of port indices to obtain a plurality of groups of port indices and each group of port indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each port index in each group of port indices is individually associated with a respective second port index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated.
[0122] Additionally, or alternatively, the UE 115-b may apply the permutation to the precoding matrix, the permutation that may include a row-wise permutation of the precoding matrix and the plurality of precoding parameters comprise the precoding matrix. In some examples, to apply the permutation to the precoding matrix, the UE 115-b may apply a permutation matrix to the precoding matrix and applying the permutation matrix organizes the plurality of precoder row indices into a plurality of groups of precoder row indices and each group of precoder row indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each precoder row index in each group of precoder row indices is individually associated with a respective second index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of precoder row indices is collectively associated. In some examples, a size of the permutation matrix corresponds to the first quantity of ports associated with the plurality of CSI-RS resources.
[0123] At 630, the UE 115-b may assign respective joint indices to respective port indices of the plurality of port indices, each respective joint index that may include a first sub-index and a second sub-index and the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and wherein the second sub-index indicates the respective second port index associated with the respective port index.
[0124] At 635, the UE 115-b may generate a CSI report in accordance with the codebook and further in accordance with a permutation applied to a plurality of precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix.
[0125] In some examples, the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, respective first dimensional indices of the plurality of first dimensional indices are associated with a single CSI-RS resource, and respective second dimensional indices of the plurality of second dimensional indices are associated with multiple CSI-RS resources.
[0126] In some examples, the ports associated with the plurality of CSI-RS resources may be mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, respective first dimensional indices of the plurality of first dimensional indices are each associated with multiple CSI-RS resources, and respective second dimensional indices of the plurality of second dimensional indices are associated with a single CSI-RS resource.
[0127] In some examples, the ports associated with the plurality of CSI-RS resources may be mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, respective first dimensional indices of the plurality of first dimensional indices are each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources, and respective second dimensional indices of the plurality of second dimensional indices are associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.
[0128] In some examples, the ports associated with the plurality of CSI-RS resources may be mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, the two-dimensional mapping scheme indicating an incrementation of the plurality of precoder row indices along the plurality of second dimensional indices for each first dimensional index.
[0129] In some examples, the mapping is performed across multiple polarizations associated with the plurality of CSI-RS resources. In some examples, the plurality of ports associated with each CSI-RS resource includes up to 32 ports.
[0130] At 640, the UE 115-b may transmit the generated CSI report (e.g., to the network entity 105-b that transmitted the CSI-RSs) .
[0131] FIG. 7 shows a block diagram 700 of a device 705 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0132] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CSI precoding permutations) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.
[0133] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CSI precoding permutations) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.
[0134] The communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be examples of means for performing various aspects of CSI precoding permutations as described herein. For example, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0135] In some examples, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0136] Additionally, or alternatively, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0137] In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.
[0138] Additionally, or alternatively, the communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The communications manager 720 is capable of, configured to, or operable to support a means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting the generated CSI report.
[0139] By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 (e.g., at least one processor controlling or otherwise coupled with the receiver 710, the transmitter 715, the communications manager 720, or a combination thereof) may support techniques for reduced processing, reduced power consumption, more efficient utilization of communication resources, or any combination thereof.
[0140] FIG. 8 shows a block diagram 800 of a device 805 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The device 805 may be an example of aspects of a device 705 or a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0141] The receiver 810 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CSI precoding permutations) . Information may be passed on to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.
[0142] The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CSI precoding permutations) . In some examples, the transmitter 815 may be co-located with a receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.
[0143] The device 805, or various components thereof, may be an example of means for performing various aspects of CSI precoding permutations as described herein. For example, the communications manager 820 may include a CSI-RS resource component 825, a CSI report generation component 830, a CSI report transmission component 835, or any combination thereof. The communications manager 820 may be an example of aspects of a communications manager 720 as described herein. In some examples, the communications manager 820, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.
[0144] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource component 825 is capable of, configured to, or operable to support a means for receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The CSI report generation component 830 is capable of, configured to, or operable to support a means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The CSI report transmission component 835 is capable of, configured to, or operable to support a means for transmitting the generated CSI report.
[0145] FIG. 9 shows a block diagram 900 of a communications manager 920 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The communications manager 920 may be an example of aspects of a communications manager 720, a communications manager 820, or both, as described herein. The communications manager 920, or various components thereof, may be an example of means for performing various aspects of CSI precoding permutations as described herein. For example, the communications manager 920 may include a CSI-RS resource component 925, a CSI report generation component 930, a CSI report transmission component 935, a permutation component 940, an indexing component 945, a mapping component 950, a segmentation component 955, a polarization component 960, a permutation matrix component 965, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
[0146] Additionally, or alternatively, the communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource component 925 is capable of, configured to, or operable to support a means for receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The CSI report generation component 930 is capable of, configured to, or operable to support a means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The CSI report transmission component 935 is capable of, configured to, or operable to support a means for transmitting the generated CSI report.
[0147] In some examples, the permutation component 940 is capable of, configured to, or operable to support a means for applying the permutation to the set of multiple port indices to obtain a set of multiple groups of port indices, where each group of port indices is collectively associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, and where each port index in each group of port indices is individually associated with a respective second port index of a set of multiple second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated. In some examples, the indexing component 945 is capable of, configured to, or operable to support a means for assigning respective joint indices to respective port indices of the set of multiple port indices, each respective joint index including a first sub-index and a second sub-index, where the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and where the second sub-index indicates the respective second port index associated with the respective port index.
[0148] In some examples, the permutation component 940 is capable of, configured to, or operable to support a means for applying the permutation to the precoding matrix, the permutation including a row-wise permutation of the precoding matrix, where the set of multiple precoding parameters include the precoding matrix.
[0149] In some examples, to support applying the permutation to the precoding matrix, the permutation matrix component 965 is capable of, configured to, or operable to support a means for applying a permutation matrix to the precoding matrix, where applying the permutation matrix organizes the set of multiple precoder row indices into a set of multiple groups of precoder row indices, where each group of precoder row indices is collectively associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, and where each precoder row index in each group of precoder row indices is individually associated with a respective second index of a set of multiple second port indices that is specific to the respective CSI-RS resource with which the group of precoder row indices is collectively associated.
[0150] In some examples, a size of the permutation matrix corresponds to the first quantity of ports associated with the set of multiple CSI-RS resources.
[0151] In some examples, the ports associated with the set of multiple CSI-RS resources are mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme including a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension. In some examples, respective first dimensional indices of the set of multiple first dimensional indices are associated with a single CSI-RS resource. In some examples, respective second dimensional indices of the set of multiple second dimensional indices are associated with multiple CSI-RS resources.
[0152] In some examples, the ports associated with the set of multiple CSI-RS resources are mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme indicating a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension. In some examples, respective first dimensional indices of the set of multiple first dimensional indices are each associated with multiple CSI-RS resources. In some examples, respective second dimensional indices of the set of multiple second dimensional indices are associated with a single CSI-RS resource.
[0153] In some examples, the ports associated with the set of multiple CSI-RS resources are mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme indicating a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension. In some examples, respective first dimensional indices of the set of multiple first dimensional indices are each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources. In some examples, respective second dimensional indices of the set of multiple second dimensional indices are associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.
[0154] In some examples, the ports associated with the set of multiple CSI-RS resources are mapped to the set of multiple precoder row indices in accordance with a two-dimensional mapping scheme including a set of multiple first dimensional indices associated with a first dimension and a set of multiple second dimensional indices associated with a second dimension, the two-dimensional mapping scheme indicating an incrementation of the set of multiple precoder row indices along the set of multiple second dimensional indices for each first dimensional index.
[0155] In some examples, the mapping is performed across multiple polarizations associated with the set of multiple CSI-RS resources.
[0156] In some examples, the set of multiple ports associated with each CSI-RS resource includes up to 32 ports.
[0157] FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The device 1005 may be an example of or include components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 1020, an input / output (I / O) controller, such as an I / O controller 1010, a transceiver 1015, one or more antennas 1025, at least one memory 1030, code 1035, and at least one processor 1040. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1045) .
[0158] The I / O controller 1010 may manage input and output signals for the device 1005. The I / O controller 1010 may also manage peripherals not integrated into the device 1005. In some cases, the I / O controller 1010 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 1010 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 1010 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 1010 may be implemented as part of one or more processors, such as the at least one processor 1040. In some cases, a user may interact with the device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.
[0159] In some cases, the device 1005 may include a single antenna. However, in some other cases, the device 1005 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1015 may communicate bi-directionally via the one or more antennas 1025 using wired or wireless links as described herein. For example, the transceiver 1015 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1015 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1025 for transmission, and to demodulate packets received from the one or more antennas 1025. The transceiver 1015, or the transceiver 1015 and one or more antennas 1025, may be an example of a transmitter 715, a transmitter 815, a receiver 710, a receiver 810, or any combination thereof or component thereof, as described herein.
[0160] The at least one memory 1030 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 1030 may store computer-readable, computer-executable, or processor-executable code, such as the code 1035. The code 1035 may include instructions that, when executed by the at least one processor 1040, cause the device 1005 to perform various functions described herein. The code 1035 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1035 may not be directly executable by the at least one processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1030 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0161] The at least one processor 1040 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 1040. The at least one processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting CSI precoding permutations) . For example, the device 1005 or a component of the device 1005 may include at least one processor 1040 and at least one memory 1030 coupled with or to the at least one processor 1040, the at least one processor 1040 and the at least one memory 1030 configured to perform various functions described herein.
[0162] In some examples, the at least one processor 1040 may include multiple processors and the at least one memory 1030 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 1040 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1040) and memory circuitry (which may include the at least one memory 1030) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1040 or a processing system including the at least one processor 1040 may be configured to, configurable to, or operable to cause the device 1005 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code 1035 (e.g., processor-executable code) stored in the at least one memory 1030 or otherwise, to perform one or more of the functions described herein.
[0163] Additionally, or alternatively, the communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The communications manager 1020 is capable of, configured to, or operable to support a means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting the generated CSI report.
[0164] By including or configuring the communications manager 1020 in accordance with examples as described herein, the device 1005 may support techniques for improved communication reliability, reduced latency, improved user experience related to reduced processing, reduced power consumption, more efficient utilization of communication resources, improved coordination between devices, longer battery life, improved utilization of processing capability, or any combination thereof.
[0165] In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 1015, the one or more antennas 1025, or any combination thereof. Although the communications manager 1020 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1020 may be supported by or performed by the at least one processor 1040, the at least one memory 1030, the code 1035, or any combination thereof. For example, the code 1035 may include instructions executable by the at least one processor 1040 to cause the device 1005 to perform various aspects of CSI precoding permutations as described herein, or the at least one processor 1040 and the at least one memory 1030 may be otherwise configured to, individually or collectively, perform or support such operations.
[0166] FIG. 11 shows a flowchart illustrating a method 1100 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The operations of the method 1100 may be implemented by a UE or its components as described herein. For example, the operations of the method 1100 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0167] At 1105, the method may include receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The operations of 1105 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed by a CSI-RS resource component 925 as described with reference to FIG. 9.
[0168] At 1110, the method may include generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The operations of 1110 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed by a CSI report generation component 930 as described with reference to FIG. 9.
[0169] At 1115, the method may include transmitting the generated CSI report. The operations of 1115 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed by a CSI report transmission component 935 as described with reference to FIG. 9.
[0170] FIG. 12 shows a flowchart illustrating a method 1200 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The operations of the method 1200 may be implemented by a UE or its components as described herein. For example, the operations of the method 1200 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0171] At 1205, the method may include receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE.
[0172] The operations of 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a CSI-RS resource component 925 as described with reference to FIG. 9.
[0173] At 1210, the method may include applying the permutation to the set of multiple port indices to obtain a set of multiple groups of port indices, where each group of port indices is collectively associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, and where each port index in each group of port indices is individually associated with a respective second port index of a set of multiple second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated. The operations of 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by a permutation component 940 as described with reference to FIG. 9.
[0174] At 1215, the method may include assigning respective joint indices to respective port indices of the set of multiple port indices, each respective joint index including a first sub-index and a second sub-index, where the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and where the second sub-index indicates the respective second port index associated with the respective port index. The operations of 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by an indexing component 945 as described with reference to FIG. 9.
[0175] At 1220, the method may include generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The operations of 1220 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1220 may be performed by a CSI report generation component 930 as described with reference to FIG. 9.
[0176] At 1225, the method may include transmitting the generated CSI report. The operations of 1225 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1225 may be performed by a CSI report transmission component 935 as described with reference to FIG. 9.
[0177] FIG. 13 shows a flowchart illustrating a method 1300 that supports CSI precoding permutations in accordance with one or more examples as disclosed herein. The operations of the method 1300 may be implemented by a UE or its components as described herein. For example, the operations of the method 1300 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0178] At 1305, the method may include receiving a set of multiple CSI reference signals via a set of multiple CSI reference signal (CSI-RS) resources, each CSI-RS resource of the set of multiple CSI-RS resources associated with a set of multiple ports, where the set of multiple CSI-RS resources share a same quasi co-location parameter, and where a first quantity of ports associated with the set of multiple CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE. The operations of 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a CSI-RS resource component 925 as described with reference to FIG. 9.
[0179] At 1310, the method may include applying the permutation to the precoding matrix, the permutation including a row-wise permutation of the precoding matrix, where the set of multiple precoding parameters include the precoding matrix. The operations of 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a permutation component 940 as described with reference to FIG. 9.
[0180] At 1315, the method may include generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a set of multiple precoding parameters associated with a mapping between a set of multiple port indices corresponding to the ports associated with the set of multiple CSI-RS resources and a set of multiple precoder row indices of a precoding matrix. The operations of 1315 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by a CSI report generation component 930 as described with reference to FIG. 9.
[0181] At 1320, the method may include transmitting the generated CSI report. The operations of 1320 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1320 may be performed by a CSI report transmission component 935 as described with reference to FIG. 9.
[0182] The following provides an overview of aspects of the present disclosure:
[0183] Aspect 1: A method for wireless communications at a UE, comprising: receiving a plurality of CSI reference signals via a plurality of CSI reference signal (CSI-RS) resources, each CSI-RS resource of the plurality of CSI-RS resources associated with a plurality of ports, wherein the plurality of CSI-RS resources share a same quasi co-location parameter, and wherein a first quantity of ports associated with the plurality of CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE; generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a plurality of precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix; and transmitting the generated CSI report.
[0184] Aspect 2: The method of aspect 1, further comprising: applying the permutation to the plurality of port indices to obtain a plurality of groups of port indices, wherein each group of port indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each port index in each group of port indices is individually associated with a respective second port index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated; and assigning respective joint indices to respective port indices of the plurality of port indices, each respective joint index comprising a first sub-index and a second sub-index, wherein the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and wherein the second sub-index indicates the respective second port index associated with the respective port index.
[0185] Aspect 3: The method of aspect 1, further comprising: applying the permutation to the precoding matrix, the permutation comprising a row-wise permutation of the precoding matrix, wherein the plurality of precoding parameters comprise the precoding matrix.
[0186] Aspect 4: The method of aspect 3, wherein applying the permutation to the precoding matrix comprises: applying a permutation matrix to the precoding matrix, wherein applying the permutation matrix organizes the plurality of precoder row indices into a plurality of groups of precoder row indices, wherein each group of precoder row indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each precoder row index in each group of precoder row indices is individually associated with a respective second index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of precoder row indices is collectively associated.
[0187] Aspect 5: The method of aspect 4, wherein a size of the permutation matrix corresponds to the first quantity of ports associated with the plurality of CSI-RS resources.
[0188] Aspect 6: The method of any of aspects 1 through 5, wherein the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension; respective first dimensional indices of the plurality of first dimensional indices are associated with a single CSI-RS resource; and respective second dimensional indices of the plurality of second dimensional indices are associated with multiple CSI-RS resources.
[0189] Aspect 7: The method of any of aspects 1 through 5, wherein the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension; respective first dimensional indices of the plurality of first dimensional indices are each associated with multiple CSI-RS resources; and respective second dimensional indices of the plurality of second dimensional indices are associated with a single CSI-RS resource.
[0190] Aspect 8: The method of any of aspects 1 through 5, wherein the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension; respective first dimensional indices of the plurality of first dimensional indices are each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources; and respective second dimensional indices of the plurality of second dimensional indices are associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.
[0191] Aspect 9: The method of any of aspects 1 through 8, wherein the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, the two-dimensional mapping scheme indicating an incrementation of the plurality of precoder row indices along the plurality of second dimensional indices for each first dimensional index.
[0192] Aspect 10: The method of any of aspects 1 through 9, wherein the mapping is performed across multiple polarizations associated with the plurality of CSI-RS resources.
[0193] Aspect 11: The method of any of aspects 1 through 10, wherein the plurality of ports associated with each CSI-RS resource includes up to 32 ports.
[0194] Aspect 12: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 11.
[0195] Aspect 13: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 11.
[0196] Aspect 14: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 11.
[0197] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0198] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
[0199] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0200] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0201] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0202] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0203] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0204] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0205] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0206] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0207] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0208] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:receive a plurality of channel state information (CSI) reference signals via a plurality of CSI reference signal (CSI-RS) resources, each CSI-RS resource of the plurality of CSI-RS resources associated with a plurality of ports, wherein the plurality of CSI-RS resources share a same quasi co-location parameter, and wherein a first quantity of ports associated with the plurality of CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE;generate a CSI report in accordance with the codebook and further in accordance with a permutation applied to a plurality of precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix; andtransmit the generated CSI report.2.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:apply the permutation to the plurality of port indices to obtain a plurality of groups of port indices, wherein each group of port indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each port index in each group of port indices is individually associated with a respective second port index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated; andassign respective joint indices to respective port indices of the plurality of port indices, each respective joint index comprising a first sub-index and a second sub-index, wherein the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and wherein the second sub-index indicates the respective second port index associated with the respective port index.3.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:apply the permutation to the precoding matrix, the permutation comprising a row-wise permutation of the precoding matrix, wherein the plurality of precoding parameters comprise the precoding matrix.4.The UE of claim 3, wherein, to apply the permutation to the precoding matrix, the one or more processors are individually or collectively operable to execute the code to cause the UE to:apply a permutation matrix to the precoding matrix, wherein applying the permutation matrix organizes the plurality of precoder row indices into a plurality of groups of precoder row indices, wherein each group of precoder row indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each precoder row index in each group of precoder row indices is individually associated with a respective second index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of precoder row indices is collectively associated.5.The UE of claim 4, wherein a size of the permutation matrix corresponds to the first quantity of ports associated with the plurality of CSI-RS resources.6.The UE of claim 1, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices be associated with a single CSI-RS resource; andrespective second dimensional indices of the plurality of second dimensional indices be associated with multiple CSI-RS resources.7.The UE of claim 1, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices are each associated with multiple CSI-RS resources; andrespective second dimensional indices of the plurality of second dimensional indices are associated with a single CSI-RS resource.8.The UE of claim 1, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices are each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources; andrespective second dimensional indices of the plurality of second dimensional indices are associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.9.The UE of claim 1, wherein the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension, the two-dimensional mapping scheme indicating an incrementation of the plurality of precoder row indices along the plurality of second dimensional indices for each first dimensional index.10.The UE of claim 1, wherein the mapping is performed across multiple polarizations associated with the plurality of CSI-RS resources.11.The UE of claim 1, wherein the plurality of ports associated with each CSI-RS resource includes up to 32 ports.12.A method for wireless communications at a user equipment (UE) , comprising:receiving a plurality of channel state information (CSI) reference signals via a plurality of CSI reference signal (CSI-RS) resources, each CSI-RS resource of the plurality of CSI-RS resources associated with a plurality of ports, wherein the plurality of CSI-RS resources share a same quasi co-location parameter, and wherein a first quantity of ports associated with the plurality of CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE;generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a plurality of precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix; andtransmitting the generated CSI report.13.The method of claim 12, further comprising:applying the permutation to the plurality of port indices to obtain a plurality of groups of port indices, wherein each group of port indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each port index in each group of port indices is individually associated with a respective second port index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of port indices is collectively associated; andassigning respective joint indices to respective port indices of the plurality of port indices, each respective joint index comprising a first sub-index and a second sub-index, wherein the first sub-index indicates the respective CSI-RS resource associated with the group that includes the respective port index, and wherein the second sub-index indicates the respective second port index associated with the respective port index.14.The method of claim 12, further comprising:applying the permutation to the precoding matrix, the permutation comprising a row-wise permutation of the precoding matrix, wherein the plurality of precoding parameters comprise the precoding matrix.15.The method of claim 14, wherein applying the permutation to the precoding matrix comprises:applying a permutation matrix to the precoding matrix, wherein applying the permutation matrix organizes the plurality of precoder row indices into a plurality of groups of precoder row indices, wherein each group of precoder row indices is collectively associated with a respective CSI-RS resource of the plurality of CSI-RS resources, and wherein each precoder row index in each group of precoder row indices is individually associated with a respective second index of a plurality of second port indices that is specific to the respective CSI-RS resource with which the group of precoder row indices is collectively associated.16.The method of claim 15, wherein a size of the permutation matrix corresponds to the first quantity of ports associated with the plurality of CSI-RS resources.17.The method of claim 12, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme including a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices are associated with a single CSI-RS resource; andrespective second dimensional indices of the plurality of second dimensional indices are associated with multiple CSI-RS resources.18.The method of claim 12, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices are each associated with multiple CSI-RS resources; andrespective second dimensional indices of the plurality of second dimensional indices are associated with a single CSI-RS resource.19.The method of claim 12, wherein:the ports associated with the plurality of CSI-RS resources are mapped to the plurality of precoder row indices in accordance with a two-dimensional mapping scheme indicating a plurality of first dimensional indices associated with a first dimension and a plurality of second dimensional indices associated with a second dimension;respective first dimensional indices of the plurality of first dimensional indices are each associated with a first subset of CSI-RS resources of a set of multiple CSI-RS resources; andrespective second dimensional indices of the plurality of second dimensional indices are associated with a second subset of CSI-RS resources of the set of multiple CSI-RS resources.20.A user equipment (UE) for wireless communications, comprising:means for receiving a plurality of channel state information (CSI) reference signals via a plurality of CSI reference signal (CSI-RS) resources, each CSI-RS resource of the plurality of CSI-RS resources associated with a plurality of ports, wherein the plurality of CSI-RS resources share a same quasi co-location parameter, and wherein a first quantity of ports associated with the plurality of CSI-RS resources is equal to a second quantity of ports indicated in a codebook configured for the UE;means for generating a CSI report in accordance with the codebook and further in accordance with a permutation applied to a plurality of precoding parameters associated with a mapping between a plurality of port indices corresponding to the ports associated with the plurality of CSI-RS resources and a plurality of precoder row indices of a precoding matrix; andmeans for transmitting the generated CSI report.
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