Spatial domain basis selection for wireless communication

Abstract

Methods, systems, and devices are described for wireless communication. A user equipment (UE) can receive one or more reference signals associated with one or more reference signal measurements. The UE can select, from a set of spatial domain bases, one or more spatial domain bases based on the one or more reference signal measurements, where each spatial domain base is eligible for independent selection, and where a quantity of the selected one or more spatial domain bases is based on a rank. The UE can transmit, based on the selection, a report indicating the selected one or more spatial domain bases, one or more co-phasing parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

Description

Technical Field

[0001] The following discussion relates to wireless communication, including spatial domain basis selection. Background Technology

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing 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-A 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 Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each supporting wireless communication of communication devices, which may be referred to as User Equipment (UE).

[0003] In some wireless communication systems, devices can choose one or more spatial domain bases for communication. However, such methods can be improved. Summary of the Invention

[0004] The described technology relates to improved methods, systems, devices, and apparatuses for supporting spatial domain base selection. For example, a user equipment (UE) can receive one or more reference signals associated with one or more reference signal measurements. The UE can select one or more spatial domain bases from a set of spatial domain bases based on the one or more reference signal measurements for reporting channel state information associated with one spatial domain base at each layer, wherein each spatial domain base in the set is eligible for selection independently of every other spatial domain base in the set, and wherein the number of selected one or more spatial domain bases is based on a rank determined by the UE based on the one or more reference signal measurements. The UE can, based on the selection, transmit reports indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0005] A method for wireless communication by a UE is described. The method may include: receiving one or more reference signals associated with one or more reference signal measurements; selecting one or more spatial domain bases from a set of spatial domain bases based on the one or more reference signal measurements, for channel state information of a type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on a rank determined by the UE based on the one or more reference signal measurements; and transmitting, based on the selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0006] An apparatus for wireless communication is described. The apparatus may include: a memory storing processor-executable code; a transceiver; and at least one processor of a UE, the at least one processor being coupled to the memory and the transceiver. The at least one processor may be operable to execute code to cause the UE to: receive one or more reference signals associated with one or more reference signal measurements; select one or more spatial domain bases based on the one or more reference signal measurements from a set of spatial domain bases for channel state information of a type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on a rank determined by the UE based on the one or more reference signal measurements; and, based on the selection, transmit a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0007] Another apparatus for wireless communication is described. The apparatus may include: means for receiving one or more reference signals associated with one or more reference signal measurements; means for selecting one or more spatial domain bases based on the one or more reference signal measurements from a set of spatial domain bases for reporting channel state information of a type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on a rank determined by the means based on the one or more reference signal measurements; and means for transmitting, based on the selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0008] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive one or more reference signals associated with one or more reference signal measurements; select one or more spatial domain bases from a set of spatial domain bases based on the one or more reference signal measurements for channel state information of a type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on a rank determined by a UE based on the one or more reference signal measurements; and transmit, based on the selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0009] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, selecting one or more spatial domain bases may include operations, features, components, or instructions for generating a layer pair comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer of the first spatial domain base may be a transpolarized cophase opposite to a second cophase value associated with the second layer of the first spatial domain base, and wherein the first cophase value and the second cophase value may be specific to the layer pair.

[0010] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, selecting one or more spatial domain bases may include operations, features, components, or instructions for generating a number of spatial domain bases based on a rank determined by the UE.

[0011] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the rank determined by the UE may be two; the first layer associated with a first spatial domain basis among one or more selected spatial domain bases may be associated with a first co-phase value; and the second layer associated with a second spatial domain basis among one or more selected spatial domain bases may be associated with a second co-phase value.

[0012] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the rank may have an odd value; and a first spatial domain basis among one or more selected spatial domain bases may be associated with a single layer, and one or more other spatial domain bases among one or more selected spatial domain bases may be associated with a corresponding layer pair.

[0013] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: applying spatial domain basis-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and applying one or more codebook-defined cophase values ​​to a second subset of one or more selected spatial domain bases.

[0014] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: applying spatial domain base-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and applying one or more shared cophase values ​​that can be common across at least two layers to a second subset of one or more selected spatial domain bases.

[0015] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: applying subband-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and applying one or more subband-common cophase values ​​to a second subset of one or more selected spatial domain bases.

[0016] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: indicating, via layer indicator parameters, a first spatial domain base to which at least one of a spatial domain base-specific cophase value or a subband-specific cophase value is to be applied.

[0017] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the selected one or more spatial domain bases may be common to subbands.

[0018] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication to select one or more co-phase parameters on a per-band or per-subband basis.

[0019] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for generating a pre-decoding matrix based on one or more selected spatial domain bases and one or more co-phase parameters; and generating channel quality information based on the pre-decoding matrix.

[0020] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the number of one or more spatial domain bases may be greater than or equal to the smallest integer value that may be greater than half the value of the rank determined by the UE; and the number of one or more spatial domain bases may be less than or equal to the value of the rank.

[0021] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the report includes selection indications indicating one or more spatial domain bases selected, or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected; and the report may not include ordering indications associated with the selected one or more spatial domain bases.

[0022] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the report includes a selection indication indicating one or more spatial domain bases selected, or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected; and the report also includes a common ordering indication associated with one or more spatial domain bases selected, or a set of multiple individual ordering indications associated with corresponding individual spatial domain bases among the one or more spatial domain bases selected.

[0023] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the channel state information associated with a spatial domain basis for each layer can be type I channel state information.

[0024] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, selecting one or more spatial domain bases may include operations, features, components, or instructions for: sorting corresponding selections of spatial domain bases from the set of spatial domain bases based on corresponding co-phase values ​​associated with each spatial domain base in the selection of spatial domain bases for each candidate rank value in a set of multiple candidate rank values, wherein the corresponding number of spatial domain bases included in each selection of spatial domain bases may be based on the corresponding corresponding candidate rank value; generating a pre-decoding matrix for each selection of spatial domain bases corresponding to the set of multiple candidate rank values, the pre-decoding matrix including an indication of the selection of spatial domain bases and the corresponding co-phase value; calculating one or more corresponding interference power values ​​for each candidate rank value and based on each corresponding generated pre-decoding matrix; calculating a corresponding spectral efficiency value for each candidate rank value and based on one or more corresponding interference power values; and selecting, based on the corresponding spectral efficiency value, a selection of spatial domain bases that may be associated with the maximum spectral efficiency as one or more spatial domain bases.

[0025] A method for wireless communication by a network entity is described. The method may include: transmitting one or more reference signals associated with one or more reference signal measurements; and receiving a report associated with channel state information of a type associated with a spatial domain base at each layer, the report indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, a rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is based on a rank determined based on one or more reference signal measurements.

[0026] An apparatus for wireless communication is described. The apparatus may include: a memory storing processor-executable code; and at least one processor of a network entity coupled to the memory. The at least one processor may be operable to execute code to cause the network entity to: transmit one or more reference signals associated with one or more reference signal measurements; and receive reports associated with channel state information of a type associated with a spatial domain base at each layer, the reports indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0027] Another apparatus for wireless communication is described. The apparatus may include: components for transmitting one or more reference signals associated with one or more reference signal measurements; and components for receiving a report associated with channel state information of a type associated with a spatial domain base at each layer, the report indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0028] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: transmit one or more reference signals associated with one or more reference signal measurements; and receive a report associated with channel state information of a type associated with a spatial domain base at each layer, the report indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, a rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of every other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is based on a rank determined based on one or more reference signal measurements.

[0029] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, one or more spatial domain bases include a layer pair comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer that may be associated with the first spatial domain base may be a transpolarized cophase opposite to a second cophase value associated with the second layer that may be associated with the first spatial domain base, and wherein the first cophase value and the second cophase value may be specific to the layer pair.

[0030] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, one or more spatial domain bases include spatial domain bases that can be based on a number of rank.

[0031] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the rank may be two; a first layer associated with a first spatial domain base in one or more spatial domain bases may be associated with a first cophase value; and a second layer associated with a second spatial domain base in one or more spatial domain bases may be associated with a second cophase value.

[0032] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the rank may have an odd value; and a first spatial domain basis in one or more spatial domain bases may be associated with a single layer, and one or more other spatial domain bases in one or more spatial domain bases may be associated with a corresponding layer pair.

[0033] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a first subset of one or more spatial domain bases may be associated with cophase values ​​specific to the spatial domain base; and a second subset of one or more spatial domain bases may be associated with cophase values ​​defined by one or more codebooks.

[0034] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, a first subset of one or more spatial domain bases may be associated with spatial domain base-specific cophase values; and a second subset of one or more spatial domain bases may be associated with one or more shared cophase values ​​that are common across at least two layers.

[0035] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a first subset of one or more spatial domain bases may be associated with subband-specific cophase values; and a second subset of one or more spatial domain bases may be associated with one or more common cophase values ​​of subbands.

[0036] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving layer indicator parameters that indicate at least one of one or more spatial domain bases to which at least one spatial domain base-specific co-phase value or subband-specific co-phase value may be applied.

[0037] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, one or more spatial domain bases may be common to subbands.

[0038] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for sending instructions to select one or more co-phase parameters on a per-band or per-subband basis.

[0039] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving channel quality information based on a pre-decoding matrix, which may be based on one or more spatial domain bases and one or more co-phase parameters.

[0040] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the number of one or more spatial domain bases may be greater than or equal to the smallest integer value that may be greater than half the value of the rank; and the number of one or more spatial domain bases may be less than or equal to the value of the rank.

[0041] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the report includes selection indications that indicate one or more spatial domain bases or two one-dimensional selection indications that jointly indicate one or more spatial domain bases; and the report may not include ordering indications associated with one or more spatial domain bases.

[0042] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the report includes selection indications that indicate one or more spatial domain bases or two one-dimensional selection indications that jointly indicate one or more spatial domain bases; and the report also includes a common ordering indication associated with one or more spatial domain bases or a set of multiple individual ordering indications associated with corresponding individual spatial domain bases in one or more spatial domain bases.

[0043] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the channel state information associated with a spatial domain basis for each layer can be type I channel state information. Attached Figure Description

[0044] Figure 1 Examples of wireless communication systems supporting spatial domain basis selection, based on one or more examples disclosed herein, are shown.

[0045] Figure 2 Examples of wireless communication systems supporting spatial domain basis selection, based on one or more examples disclosed herein, are shown.

[0046] Figure 3 An example of a process flow for supporting spatial domain base selection is shown, based on one or more examples as disclosed herein.

[0047] Figure 4 and Figure 5 A block diagram of a device supporting spatial domain base selection is shown, based on one or more examples as disclosed herein.

[0048] Figure 6 A block diagram of a communication manager supporting spatial domain base selection, based on one or more examples as disclosed herein, is shown.

[0049] Figure 7 A diagram is shown of a system including a device that supports spatial domain base selection, according to one or more examples disclosed herein.

[0050] Figure 8 and Figure 9 A block diagram of a device supporting spatial domain base selection is shown, based on one or more examples as disclosed herein.

[0051] Figure 10 A block diagram of a communication manager supporting spatial domain base selection, based on one or more examples as disclosed herein, is shown.

[0052] Figure 11 A diagram is shown of a system including a device that supports spatial domain base selection, according to one or more examples disclosed herein.

[0053] Figure 12 and Figure 13 A flowchart illustrating a method for supporting spatial domain base selection based on one or more examples as disclosed herein is shown. Detailed Implementation

[0054] In wireless communication, devices can communicate using multiple spatial domain (SD) bases. However, the number of ports available for communication may increase with the development of antenna arrays, which may include a larger number of antennas, resulting in a greater number of ports available for communication using spatial domain bases. As the number of ports increases, other methods used with a smaller number of ports lead to an increase in the complexity of the “search space” for selecting spatial domain bases with an increased number of available ports. For example, the complexity of previous methods increases with the number of available ports and SD bases as more ports and possible candidate SD bases become available. Furthermore, with more ports available, other methods using which adjacent spatial domain bases are selected for use result in a decrease in the field of view (FOV) of the group of adjacent spatial domain bases. For example, with more ports available, the SD base for each port can become narrower, and a group of SD bases can cover less spatial resources compared to the case with a smaller number of available ports. Therefore, improved techniques for selecting spatial domain bases may be desired.

[0055] Techniques for selecting the SD base can be employed. For example, devices such as User Equipment (UE) or network entities can participate in heuristic SD base selection to reduce complexity and increase the field of view (FOV) of the selected SD base. For instance, the UE can freely select an SD base from possible combinations of SD bases (e.g., the selection is not limited to a “continuous” set of SD bases) and can do so based on the rank associated with the UE (e.g., the number of possible communication layers to use, such as multiple-input multiple-output (MIMO) layers). As used herein, a layer can refer to a number of communication layers (e.g., MIMO layers), or it can correspond to a number of layers used for Channel State Information (CSI) reporting, a number of columns included in a pre-decoding matrix, or any combination thereof. The UE can simplify one or more operations for selecting the SD base by using one or more predefined co-phase parameters (e.g., the φ parameter in the pre-decoding matrix indicator (PMI)) or by applying the same co-phase parameter to multiple communication layers. In this way, the choice of SD base is more flexible, allowing selection from any available SD base, and the complexity of related operations can be reduced, resulting in reduced processing overhead, reduced latency, increased communication quality and reliability, improved user experience, or any combination thereof.

[0056] The various aspects of this disclosure are first described in the context of a wireless communication system. Then, the various aspects of this disclosure are described with reference to a wireless communication system and process flow. The various aspects of this disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to spatial domain base selection.

[0057] Figure 1 An example of a wireless communication system 100 supporting spatial domain base selection is shown, according to one or more examples disclosed herein. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating under other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0058] Network entity 105 may be distributed across a geographical area to form wireless communication system 100, and may include devices employing different forms or having different capabilities. In various examples, network entity 105 may be referred to as a network element, mobility element, radio access network (RAN) node, or network equipment, etc. In some examples, network entity 105 and UE 115 may wirelessly communicate via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, network entity 105 may support coverage area 110 (e.g., a geographical coverage area) within which UE 115 and network entity 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographical area within which network entity 105 and UE 115 may support the transmission of signals according to one or more radio access technologies (RATs).

[0059] UE 115 can be distributed throughout the coverage area 110 of wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. UE 115 can be devices in different forms or with different capabilities. Figure 1 Some example UE 115s are illustrated herein. The UE 115 described herein can be able to support various types of devices (such as, e.g., ...). Figure 1 It communicates with other UEs (115 or network entity 105) as shown.

[0060] As described herein, nodes of the wireless communication system 100 (which may be referred to as network nodes or wireless nodes) may be network entity 105 (e.g., any network entity described herein), UE 115 (e.g., any UE described herein), network controller, apparatus, device, 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 UE 115. Alternatively, a node may be network entity 105. Furthermore, a first node may be configured to communicate with a second or third node. In one aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be UE 115. In another aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different from these examples. Similarly, references to UE 115, network entity 105, device, equipment, computing system, etc., may include disclosures of UE 115, network entity 105, device, equipment, computing system, etc., as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that a first node is configured to receive information from a second node.

[0061] In some examples, network entity 105 may communicate with core network 130, communicate with each other, or both. For example, network entity 105 may communicate with core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, network entities 105 may communicate with each other directly (e.g., directly between network entities 105) or indirectly (e.g., via core network 130) via backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, network entities 105 may communicate with each other via midhaul communication link 162 (e.g., according to midhaul interface protocol) or fronthaul communication link 168 (e.g., according to fronthaul interface protocol) or any combination thereof. Backhaul communication link 120, midhaul communication link 162, or fronthaul communication link 168 may be or include one or more wired links (e.g., electrical links, fiber optic links), one or more wireless links (e.g., radio links, wireless optical links), etc., or various combinations thereof. UE 115 can communicate with core network 130 via communication link 155.

[0062] One or more network entities in network entity 105 described herein may include or be referred to as base station 140 (e.g., transceiver base station, radio base station, NR base station, access point, radio transceiver, node B, eNodeB (eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), 5G NB, next-generation eNB (ng-eNB), home node B, home evolution node B, or other suitable terms). In some examples, network entity 105 (e.g., base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture that may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as base station 140).

[0063] In some examples, network entity 105 may be implemented in a decomposed architecture (e.g., a decomposed base station architecture, a decomposed RAN architecture) that can be configured to utilize protocol stacks physically or logically distributed across two or more network entities 105, such as an integrated access 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, network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC, a non-real-time RIC), a service management and orchestration (SMO) 180 system, or any combination thereof. 170 may also be referred to as a radio headend, intelligent radio headend, remote radio headend (RRH), remote radio unit (RRU), or transmit / receive point (TRP). One or more components of network entity 105 in a decomposed RAN architecture may be co-located, or one or more components of network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 in a decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0064] The functional splitting among CU 160, DU 165, and RU 170 is flexible and can support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a protocol stack functional splitting can be used between CU 160 and DU 165, allowing CU 160 to support one or more layers of the protocol stack, and DU 165 to support one or more different layers of the protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionalities and signaling (e.g., Radio Resource Control (RRC), Serving Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). CU 160 can connect to one or more DU 165 or RU 170, and one or more DU 165 or RU 170 can 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 each can be at least partially controlled by CU 160. Additionally or alternatively, a protocol stack functional split can be employed between DU 165 and RU 170, such that DU 165 can support one or more layers of the protocol stack, and RU 170 can support one or more different layers of the protocol stack. DU 165 can support one or more different cells (e.g., via one or more RU 170). In some cases, functional decomposition between CU 160 and DU 165, or between DU 165 and RU 170, can be performed within the protocol layer (e.g., some functions of the protocol layer can be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer can be performed by different of CU 160, DU 165, or RU 170). CU 160 can be further functionally decomposed into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 can be connected to one or more DU 165 via midhaul communication link 162 (e.g., F1, F1-c, F1-u), and DU 165 can be connected to one or more RU 170 via fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented based on the interfaces (e.g., channels) between the layers of the protocol stack, which are supported by the corresponding network entities 105 communicating via such communication links.

[0065] In a wireless communication system (e.g., wireless communication system 100), the infrastructure and spectrum resources for radio access can support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB node 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DU 165s or one or more RU 170s may be partially controlled by one or more CU 160s associated with donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB node 104) via supported access and backhaul links (e.g., backhaul communication link 120). IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include a separate set of antennas for relaying communication with UE 115, or may share the same antennas (e.g., those of RU 170) for access to IAB node 104 via DU 165 of IAB node 104. (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of IAB node 104) may be configured to operate according to the techniques described herein.

[0066] For example, the access network (AN) or RAN may include communication between an access node (e.g., an IAB donor), IAB node 104, and one or more UEs 115. The IAB donor may facilitate connectivity 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 having a wired or wireless connection to the core network 130. The IAB donor may include a CU 160 and at least one DU 165 (e.g., and RU 170), wherein the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link). The IAB donor and IAB node 104 may communicate via an F1 interface according to a protocol defining the signaling messages (e.g., the F1 AP protocol). Additionally or alternatively, the CU 160 may communicate with the core network via an interface (which may be part of a backhaul link) and may communicate with other CU 160s (e.g., CU 160 associated with an alternative IAB donor) via an Xn-C interface (which may be part of a backhaul link).

[0067] IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UE 115, radio self-backhaul capability, etc.). DU 165 may act as a distributed scheduling node toward child nodes associated with IAB node 104, and IAB-MT may act as a scheduled node toward a parent node associated with IAB node 104. That is, an IAB donor may be referred to as a parent node communicating with one or more child nodes (e.g., an IAB donor may relay for UE transmissions via one or more other IAB nodes 104). Additionally or alternatively, depending on the AN's relay chain or configuration, IAB node 104 may also be referred to as a parent or child node of other IAB nodes 104. Therefore, the IAB-MT entity of IAB node 104 can provide a Uu interface for child IAB node 104 to receive signaling from parent IAB node 104, and the DU interface (e.g., DU 165) can provide a Uu interface for parent IAB node 104 to send signaling notifications to child IAB node 104 or UE 115.

[0068] For example, IAB node 104 may be referred to as a parent node supporting communication to child IAB nodes, or as a child IAB node associated with an IAB donor, or both. An IAB donor may include a CU 160 having a wired or wireless connection to core network 130 (e.g., backhaul communication link 120) and may act as a parent node of IAB node 104. For example, the IAB donor's DU 165 may relay transmissions to UE 115 via IAB node 104, or may signal transmissions directly to UE 115, or both. The IAB donor's CU 160 may signal the establishment of a communication link to IAB node 104 via an F1 interface, and IAB node 104 may schedule transmissions via DU 165 (e.g., transmissions relayed from the IAB donor to UE 115). That is, data may be relayed to and from IAB node 104 via signaling through the NR Uu interface of the MT to IAB node 104. Communication with IAB node 104 can be scheduled by DU 165 of the IAB donor, and communication with IAB node 104 can be scheduled by DU 165 of IAB node 104.

[0069] When the techniques described herein are applied in the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture can be configured to support spatial domain base selection as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0070] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0071] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, network entities 105, and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1As shown.

[0072] UE 115 and network entity 105 can wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" can refer to a set of RF spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the RF spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 may be configured to utilize multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between network entity 105 and other devices can refer to communication between these devices and any part of network entity 105 (e.g., entity, sub-entity). For example, the terms “send,” “receive,” or “communicate” when referring to network entity 105 can refer to any part of the RAN’s network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) communicating with another device (e.g., directly or via one or more other network entities 105).

[0073] In some examples, such as in carrier aggregation configurations, a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified according to a channel grating used for discovery by UE 115. A carrier may operate in standalone mode, in which case initial acquisition and connection can be performed by UE 115 via that carrier, or the carrier may operate in non-standalone mode, in which case different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0074] The communication link 125 shown in the wireless communication system 100 may include downlink transmission (e.g., forward link transmission) from network entity 105 to UE 115, uplink transmission (e.g., return link transmission) from UE 115 to network entity 105, or both, as well as other transmission configurations. A carrier may carry downlink communication or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0075] A carrier may be associated with a specific bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one bandwidth in a set of bandwidths for a particular radio access technology (e.g., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). Devices of the wireless communication system 100 (e.g., network entity 105, UE 115, or both) may have hardware configurations that support communication using a specific carrier bandwidth, or may be configured to support communication using one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 may include network entity 105 or UE 115 that supports concurrent communication using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0076] The signal waveform transmitted via a carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both), such that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high modulation scheme order correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0077] It can support one or more sets of parameters for a carrier, and the set of parameters may include subcarrier spacing ( (and cyclic prefix). A carrier can be divided into one or more BWPs with the same or different sets of parameters. In some examples, UE 115 can be configured using multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and the communication of UE 115 can be constrained to one or more active BWPs.

[0078] The time interval for network entity 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period. seconds, of which It can represent the supported subcarrier spacing, and This can represent the supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0079] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into a certain number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a certain number of symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., The duration of a symbol period is associated with a (number) sampling period. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0080] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0081] Depending on the technology, carriers can be used to multiplex physical channels for communication. One or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used, for example, to multiplex physical control channels and physical data channels for signaling via a downlink carrier. The control region (e.g., control resource set (CORESET)) of the physical control channel can be defined by a set of symbol periods and can extend across the system bandwidth of the carrier or a subset of that bandwidth. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs in UE 115 can monitor or search for control regions to obtain control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a concatenated manner. The aggregation level of control channel candidates can refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include: a common search space set configured to transmit control information to multiple UEs 115, and a UE-specific search space set used to transmit control information to a specific UE 115.

[0082] Network entity 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used (e.g., using a carrier) to communicate with network entity 105 and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or other identifier). In some examples, a cell may also refer to a coverage area 110 or a portion of coverage area 110 (e.g., a sector) in which a logical communication entity operates. Depending on various factors such as the capabilities of network entity 105, the range of such cells may be from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be a building, a subset of buildings, or external space between or overlapping coverage areas 110, or may include buildings, subsets of buildings, or external space between or overlapping coverage areas.

[0083] Macro cells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access to UE 115 that has a service subscription with a network provider supporting the macro cell. In contrast, small cells may be associated with a lower-power network entity 105 (e.g., a lower-power base station 140) and may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to UE 115 that has a service subscription with a network provider, or restricted access to UE 115 associated with a small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a home or office). Network entity 105 may support one or more cells and may also use one or more component carriers to support communication via one or more cells.

[0084] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0085] In some examples, network entity 105 (e.g., base station 140, RU 170) may be mobile, and thus provide communication coverage to mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 use the same or different radio access technologies to provide coverage for various coverage areas 110.

[0086] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base station 140) can have similar frame timings, and transmissions from different network entities 105 can be approximately time-aligned. For asynchronous operation, network entities 105 can have different frame timings, and in some examples, transmissions from different network entities 105 may not be time-aligned. The techniques described herein can be used for both synchronous and asynchronous operation.

[0087] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices with integrated sensors or meters to measure or acquire information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices 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 geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0088] Some UE 115s can be configured to operate in a power-saving mode, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but does not involve concurrent transmission and reception). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UE 115s include entering a power-saving deep sleep mode when not engaged in active communication, operating with limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE 115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0089] Wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communication may include private or group communications 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 prioritizing services, and such services may be used for public safety or general business applications. The terms “ultra-reliable,” “low-latency,” and “ultra-reliable low-latency” are used interchangeably herein.

[0090] In some examples, UE 115 may be configured to support direct communication with other UE 115s via device-to-device (D2D) communication link 135 (e.g., according to peer-to-peer (P2P), D2D, or sidelink protocols). In some examples, one or more UE 115s in a group performing D2D communication may be within the coverage area 110 of network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled by network entity 105). In some examples, one or more UE 115s in such a group may be outside the coverage area 110 of network entity 105, or may otherwise be unable or not configured to receive transmissions from network entity 105. In some examples, the group of UE 115s communicating via D2D communication may support a one-to-many (1:M) system, where each UE 115 transmits to each of the other UE 115s in the group. In some examples, network entity 105 may facilitate the scheduling of resources used for D2D communication. In other examples, D2D communication may be performed between UEs 115 without involving network entity 105.

[0091] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0092] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) for routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by network entity 105 (e.g., base station 140) associated with core network 130. User IP packets can be transferred through user plane entities, which provide IP address allocation and other functions. User plane entities can connect to one or more network operator IP services 150. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0093] Wireless communication system 100 can operate using one or more frequency bands in the range of 300 MHz to 300 GHz. Generally, the area from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) band or decimeter band because the wavelength range is 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 these waves are sufficient to penetrate structures so that macrocells can provide service to UE 115 located indoors. Compared to communication using smaller frequencies and longer wavelengths in the lower frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, communication using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0094] The wireless communication system 100 can also operate in the Ultra High Frequency (SHF) band (also known as the centimeter band) in the range of 3 GHz to 30 GHz or in the Extremely High Frequency (EHF) band (e.g., 30 GHz to 300 GHz) (also known as the millimeter band) using the spectrum. In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and network entity 105 (e.g., base station 140, RU170), and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, such techniques facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may experience even greater attenuation and shorter range. The techniques disclosed herein can be adopted for transmissions using one or more different frequency bands, and the frequency band usage specified across these frequency bands may vary by country or regulatory authority.

[0095] Wireless communication system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, wireless communication system 100 may use unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology. When operating with unlicensed RF spectrum, devices such as network entity 105 and UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation using unlicensed bands may be combined with component carriers operating with licensed bands based on carrier aggregation configurations (e.g., LAA). Operation using unlicensed spectrum may include downlink transmission, uplink transmission, P2P transmission, or D2D transmission, etc.

[0096] Network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, MIMO communication, or beamforming. The antennas of network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which can support MIMO operation 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, the antennas or antenna arrays associated with network entity 105 may be located at different geographical locations. Network entity 105 may include an antenna array having a collection of multiple rows and columns of antenna ports that network entity 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0097] Network entity 105 or UE 115 may use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique may be referred to as spatial multiplexing. The multiple signals may be transmitted, for example, by a transmitting device via different antennas or different combinations of antennas. Similarly, the multiple signals may be received by a 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 multi-user MIMO (MU-MIMO), for which multiple spatial layers are transmitted to multiple devices.

[0098] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., network entity 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating along a specific orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include applying amplitude shifts, phase shifts, or both to the signals carried via the antenna elements associated with the device. The adjustments associated with each of these antenna elements may be defined by a beamforming weight set associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device or relative to some other orientation).

[0099] Network entity 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by network entity 105 in different directions. For example, network entity 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmission along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105) or by a receiving device (such as UE 115)) the beam direction for later transmission or reception by network entity 105.

[0100] Some signals (such as data signals associated with a specific receiving device) may be transmitted by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., the direction associated with a receiving device (such as receiving network entity 105 or receiving UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted along one or more beam directions. For example, UE 115 may receive one or more signals transmitted by network entity 105 in different directions and may report to network entity 105 an indication of signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0101] In some examples, transmissions performed by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital pre-decoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating pre-decoding weights for one or more beam directions, and this feedback may correspond to a set of beams configured across the system bandwidth or one or more sub-bands. Network entity 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), CSI reference signals (CSI-RS)), which may or may not be pre-decoded. UE 115 may provide feedback for beam selection, which may be a pre-decoded matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals transmitted by network entity 105 (e.g., base station 140, RU 170) in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0102] A receiving device (e.g., UE 115) may perform reception operations according to multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a transmitting device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple reception directions by: receiving via different antenna subarrays; processing the received signal according to different antenna subarrays; receiving according to different sets of reception beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing the received signal according to different sets of reception beamforming weights applied to signals received at multiple antenna elements of the antenna array. Any of these operations may be referred to as “listening” according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when a data signal is received). A single receiver configuration can be aligned along a beam direction determined based on listening according to different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0103] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or PDCP layer can be IP-based. The RLC layer performs packet segmentation and reassembly for transmission via logical channels. The MAC layer performs priority processing and multiplexing of logical channels to transport channels. The MAC layer can also use error detection, error correction, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer provides the establishment, configuration, and maintenance of RRC connections between the UE 115 and network entity 105 or core network 130 that support user plane data radio bearers. The PHY layer maps transport channels to physical channels.

[0104] UE 115 and network entity 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data via communication links (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support same-slot HARQ feedback, in which case the device can provide HARQ feedback in a specific time slot for data received via a previous symbol in that time slot. In some other examples, the device may provide HARQ feedback in subsequent time slots or according to a different time interval.

[0105] The UE can receive one or more reference signals associated with one or more reference signal measurements and can select one or more spatial domain bases based on those measurements. During this selection process, each spatial domain base can be selected independently of other SD bases (e.g., it is not necessary to select adjacent SD bases). In some examples, the number of selected spatial domain bases is based on a rank determined by the UE. The UE can transmit reports indicating the selected spatial domain bases, other information associated with the selected spatial domain bases, or any combination thereof, based on the selection. Therefore, communication quality can be increased, resulting in reduced processing overhead, reduced latency, increased communication quality and reliability, improved user experience, or any combination thereof.

[0106] Figure 2 An example of a wireless communication system 200 supporting spatial domain base selection is shown, based on one or more examples disclosed herein.

[0107] Wireless communication system 200 may include network entity 105-a, which may be an example of one or more network entities discussed with respect to other figures. Wireless communication system 200 may include UE 115-a, which may be an example of one or more UEs discussed with respect to other figures. In some examples, UE 115-a may be located in a geographic coverage area 110-a that may be associated with network entity 105-a. 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.

[0108] In wireless communication, wireless devices can employ a number of ports that can be associated with the number of antennas used for wireless communication. For example, some devices may include a larger number of ports, such as more than 32 ports, or even 64 ports. For instance, some techniques involving 64 transmit-receive units (TXRUs) are used for time division duplex (TDD) operation (e.g., at 3.5 GHz). In some examples, a larger number of TXRUs may be desired for operation over certain frequency ranges (e.g., the FR1 range of 6425 MHz–7125 MHz). In some examples, antenna elements may be placed more densely on an antenna array.

[0109] In some examples, the number of ports used for communication can be expressed as two numbers, by and It means, together, expressed as Therefore, in some examples, the different quantities of ports can be expressed by a table such as Table 1, where the total number of available ports can be represented by... This indicates that, in some examples, the use of TDD can involve CSI for component carriers (CCs) that may not be involved in the uplink. For example, a 700MHz transmission at 6GHz could involve 7 CCs.

[0110] Table 1 In some examples, UE 115-a or other devices can combine Type I CSI operation. In Type I CSI, a single SD base can be used for a single pre-decoding layer. In some examples, orthogonal pre-decoders can be used across layers via different techniques. In a first technique, the orthogonal pre-decoders can be indexed within the same oversampled group. The orthogonal SD basis used in the inner (e.g., In In the second technique, the orthogonal pre-decoder can be used across layers via the same SD basis with opposite co-phase, as follows: therefore: In such examples, It can be used with a Quadrature Phase Shift Keying (QPSK) value of 1 or Related. In some examples, such a method can be similar to a 2-port codebook used for rank 2.

[0111] In some examples, SD basis patterns can be used. In some examples, for ranks 2, 3, and 4, two broadband orthogonal SD bases can be used, where the second SD base can be selected or reported from multiple (e.g., 4) orthogonally adjacent SD bases of the first SD base (e.g., ...). In some examples, for ranks 5 to 8, multiple base patterns with a fixed SD can be used (e.g., (a) broadband orthogonal adjacency SD basis (e.g., in a 2×2 or 4×1 arrangement of orthogonal adjacencies). For example, a 2×2 arrangement can be expressed as And a 4×1 arrangement can be expressed as In some examples, multiple (e.g., for rank 1 (or for the first SD basis of rank 2) can be used) (Number) wideband nonorthogonal adjacent SD bases, where for each subband, multiple (e.g., Further selection is made from non-orthogonal adjacent pairs.

[0112] In some examples, a co-phase mode can be used. This co-phase mode can be restricted to co-phase for more than one pair of layers. For example, for rank 4, 6, or 8, the first 4 levels (e.g., the first 2 level pairs) can be expressed as In some examples, for rank 2, In some examples, co-phase It can be broadband, or it can be per subband.

[0113] However, in some approaches, Type I CSI assumes that the "search space" can increase with N1, N2. For example, when using a larger number of ports, and if existing methods can be easily extended to such a larger number of ports by fully reusing existing mechanisms (e.g., extended to...). The complexity of CSI searches also increases proportionally. Furthermore, from a performance perspective, larger... and The value can reduce the effective field of view (FOV) of the selected SD base used for communication. Such a narrower FOV can reduce high-rank probabilities because fewer propagation paths are covered within it. For example, for one-dimensional... The FOVs of the four orthogonally adjacent SD bases are approximately {100°, 45°, 23°}.

[0114] Therefore, it might be desirable to reduce the CSI assumption "search space" while enabling more flexible SD base patterns to cover more propagation paths. Furthermore, a "unified" design might be desired between Type I and Type II CSI. For example, for Type I, a "nested" structure might be desired regarding the number and rank of ports, which is likely desirable given the general principles of Type II CSI.

[0115] Therefore, to reduce the CSI hypothesis "search space" used for selecting an SD base and increasing the FOV associated with the selected SD base, the radio device (e.g., UE 115-a) can employ "heuristic" SD base selection (e.g., replacing hypothesis search with a restricted SD base pattern, as used in some Type I codebook methods for selecting orthogonal adjacent SD bases). In such techniques, UE 115-a can select the strongest preceding... An orthogonal SD basis (e.g., by ordering). UE 115-a can select such an SD basis for type ICSI, which includes a single SD basis per layer (e.g., therefore...). Applied to it (The situation). Type I CSI may include or consider multiple "possibilities" by taking into account orthogonal transpolarization co-phase values. This allows for the sorting of the power of the SD base and the acquisition of layer pairs. For example, given a layer with transpolar co-phase... The selected SD base This allows us to obtain a pair of two layers as follows: For example, UE 115-a can receive reference signal 220 from network entity 105-a. UE 115-a can measure reference signal 220 to obtain one or more reference signal measurements 240. UE 115-a can select one or more SD bases from SD base set 230 as selected SD bases 235, and can do so based on reference signal measurements 240. Note that selecting a selected SD base 235 from the complete set 230 of SD bases is operated using UE signal processing, which uses a portion of the CSI feedback used for network pre-decoding. In some examples, UE 115-a can select any SD base from the SD base set 230, and is not limited to selecting adjacent SD bases as selected SD bases 235. Furthermore, UE 115-a can select any number of SD bases from the SD base set 230 as selected SD bases 235. In some examples, the number of selected SD bases can be based on rank, and in some cases, this rank can be determined by UE 115-a based on reference signal measurements 240. UE 115-a can send report 225 to network entity 105-a, and report 225 can be a report associated with a Type I CSI report. Report 225 may include or indicate the selected SD base 235, one or more co-phase parameters associated with the selected SD base 235, the rank associated with the selected SD base 235 (e.g., the rank determined by UE 115-a based on reference signal measurement 240), channel quality information associated with the selected SD base 235, or any combination thereof. In this way, UE 115-a can freely select the selected SD base 235 from the set of SD bases 230, thereby reducing complexity and increasing the potential FOV of the selected SD base 235.

[0116] In some examples, UE 115-a may employ a sorting process to obtain the strongest or most desired SD base for communication. In the first step, UE 115-a may sort the SD base for each rank (e.g., 1 to 1). ,in This indicates the number of the UE's receive antennas, which can be, for example, 2, 4, or 8, ordered (e.g., on a broadband basis) by the strongest ones. One SD base. In some examples, UE 115-a may also obtain one or more associated SD oversampling group indices. ,in In some examples of this first step, the SD base... The power can be determined according to the following formula: Therefore, in the example using QPSK co-phase, it has two possibilities. Such techniques can lead to the following output: 1) for each rank, where The set of sorted SD bases And optional associated SD oversampling group index ; and 2) co-phase value .

[0117] In the second step, UE 115-a can determine the pre-decoder matrix. For even rank, the pre-decoder matrix is ​​expressed as: UE 115-a can determine the pre-decoder matrix. For odd rank, the pre-decoder matrix is ​​expressed as: In the third step, UE 115-a can be based on the pre-decoder for each hypothesis (e.g., rank). The interference can be calculated, and the rank-sum predecoder to be used can be further determined based on which predecoder matrix is ​​associated with the highest spectral efficiency (e.g., predecoder matrix indicator (PMI)).

[0118] Because the number of CSI assumptions can be determined by the total number of possible rank values ​​(e.g., the rank can be based on the number of receive antennas in UE 115-a). (e.g., 4 or 8) may not be related to the number of sending ports. This increases proportionally, thus reducing the complexity of the possible search space for the SD bases. In some examples, a sorting function can be applied based on the broadband power of each SD base (e.g., for heuristics or techniques). Although in some cases, the sorting complexity may increase with the number of transmitting ports. While this increases complexity, it is less than the full process for calculating CSI hypotheses, as done in other methods (e.g., involving channel and interference measurements). Therefore, the overall complexity is reduced compared to codebook-based hypothesis-based search methods.

[0119] Furthermore, the selected SD basis mode is derived from all possible orthogonal oversampling groups. It may be completely free (e.g., from all...) Choose X (for example, instead of being limited to consecutive or adjacent SD bases). For example, the total can be used The choice of SD base is used to report the selection. Alternatively, by using a more widely distributed SD base, the overall FOV can be kept wider than in other methods.

[0120] In some examples (e.g., for a Type I CSI report with a single SD base for each layer selection), UE 115-a can be obtained from... A complete set of orthogonal SD bases (e.g., SD base set 230) is selected from multiple (denoted as...) X is an orthogonal SD basis (e.g., the selected SD basis 235). In some examples, the number X of the selected SD basis 235 can be less than (e.g., the number of available SD basis sets 230), such that... The selected SD base 235 can be from the SD base set 230. Any potential combination of available SD bases.

[0121] Furthermore, the number of selected SD bases 235 can be based on the rank determined or reported by UE 115-a. For example, the number can be determined. , making Additionally or alternatively, the quantity X can be determined as shown in Table 2. In some examples, typical quantities can be determined. , making In some examples, for ranks less than or equal to the rank threshold (or otherwise satisfying the rank threshold), the quantity can be determined. , making For example, for rank 2, the quantity It can be 2 (for example, as shown in Table 2).

[0122] Table 2 For those based on the same selected SD base A layer "pair" (e.g., two layers with two consecutive layer indices), a reporting phase (with opposite transpolarization cophase) To realize orthogonality as In some examples, It is specific to the SD base. In some examples, It can be layer-specific or layer-pair-specific. In some examples, for even rank (e.g., 2, 4, 6, 8), it can exist. A number of layer pairs. In some examples, for odd rank (e.g., 3, 5, 7), there may exist... Each layer is paired.

[0123] In some examples, for odd-rank, "isolated" layers may exist. In such examples, associated cophase (e.g., The probability of co-phase between layer pairs (e.g., This can be increased (e.g., doubled) (e.g., and can be reported by increasing or doubling the number of bits). For example, in the case involving QPSK co-phase, there are two possibilities. Can be associated with SD base The layers are associated with each other, and the four possibilities can be associated with such “isolated” layers (e.g., In some examples, the cophase of the "isolated" layer... The following formula can be used to determine or select: In some examples, the selected SD base 235 can be per-bandwidth (e.g., subband common). In some examples, This can be per-bandwidth or per-subband (e.g., configurable by UE 115-a, network entity 105-a, or another wireless communication device). In some examples, if the SD base is less than or otherwise meets the SD base threshold parameter (e.g., if...), If the parameter is greater than or otherwise meets the threshold, then broadband can be used. This is because, in some cases, a single path delay can be assumed for each SD base.

[0124] In some examples, the co-phase value can be adjusted in one or more ways. The use of this adjustment can help reduce the complexity of sorting the SD base as part of selecting the chosen SD base 235.

[0125] In some examples of the first technology, It can be applied to some layers, but not all layers (e.g., This can be applied to the first layer or the first few layers, while the remaining layers have a fixed co-phase, a co-phase defined or indicated by the codebook, or any combination thereof. An example arrangement of such a first technique can be represented by the following formula: In some examples of the second technology, it is typically reported that This can be applied to different layer pairs (e.g., the last few layer pairs). In other words, the same co-phase value can be applied to multiple layer pairs. An example arrangement of this second technique involving rank 6 can be represented by the following equation: In some examples of the third technology This can be a per-subband parameter used for a portion of a layer (e.g., the first layer, the first few layers, or another number of layers that meet a threshold), while For the remaining layers, it can be per bandwidth.

[0126] For one or more of the techniques related to co-phase values ​​described herein, one or more layers (e.g., a "special" first layer, ...) It can be applied to one or more layers, and is typically reported. One or more layers that can be applied, one or more layers applied on a per-subband basis, or any combination thereof, can be indicated by a layer indicator (LI). Such indicated layers may not be affected by one or more aspects of the described technique, or may not be affected by simplifications or sharing of co-phase parameters (e.g., complete assumptions may be used). All potential values ​​can be used, or such parameters can be shared by no more than one layer pair, or any combination thereof.

[0127] In some examples involving smaller ranks (e.g., rank 2, 3, 4, or other values ​​that satisfy the rank threshold), the number of SD bases to be selected as the chosen SD base 235 (e.g., values) ) can be expressed as Layer pairs can be used (e.g., layers with the same selected SD base). Two layers) and more than one "isolated" layer (e.g., each "isolated" layer has a selected SD base). (or related to it) a mixture. In some examples, and in some cases, based on the selection mechanism described in this paper, a superset of the codebook may be possible and pre-decoding performance may be improved.

[0128] In one example involving an isolated layer of rank 2, where... For a chosen SD base (e.g., SD base 235), the associated pre-decoder can be expressed as follows: In some examples, report 225 may include or indicate different information. For example, report 225 may include or indicate the selected SD base 235, one or more co-phase parameters associated with the selected SD base 235, the rank associated with the selected SD base 235, channel quality information associated with the selected SD base 235, or any combination thereof.

[0129] In some examples, report 225 may not include or indicate sorting information (e.g., sorting information indicating the sorting of the selected SD base 235 performed by UE 115-a or by another wireless communication device). For example, in order to report the selected SD base 235, UE 115-a may (e.g., as a supplement or alternative to other reports described herein) select or indicate sorting of the selected SD base 235. (For example, in the SD base set 230) The selection of a combination of SD bases (e.g., the selected SD base 235) can be determined by... Bit representation. Additionally or alternatively, UE 115-a can select two dimensions separately. For example, UE 115-a can be transmitted via... Position and position from Select And from Select In some cases, the second-stage selection instruction can be used to select or instruct on the selection of a pair of pairs. In The choice of SD base, such as via Bit or size The bitmap.

[0130] In some examples, the report may include or indicate sorting information (e.g., sorting information indicating the sorting of the selected SD base 235 performed by UE 115-a or by another wireless communication device). For example, to report the selected SD base 235, UE 115-a may include (e.g., as a supplement or alternative to other reports described herein) an indication of the sorting of SD bases for a number of SD bases that satisfy a threshold number (e.g., up to 4 SD bases). In the example of 4 SD bases, then... Bits can be used from The possibilities indicate the ordering arrangement. Additionally or alternatively, UE 115-a may include (e.g., as a supplement or alternative to other reports described herein) selection of each SD base. For example, the first selected SD base may be via... Bit indicator, and the second selected SD base can also be via Bit indicator, and so on, until the 1st bit. Selected SD base Bit indicator.

[0131] In some examples, for which For oversampling group selection, UE 115-a can employ one or more mechanisms associated with CSI Type II. For example, UE 115-a can be via... The person participated in the sampling group selection operation.

[0132] In some examples, in addition to one or more co-phase values, UE 115-a can also select one or more co-amplitude values, which for SD base... It can be expressed as a value For example, for those having... The selected SD basis representing the transpolarization cophase value. Layer pairs can be obtained through a power-normalized pre-decoder, as shown below: In some examples, given an SD base The power can be expressed by the following formula: In such cases, for each The output of the operation that determines the power of one or more SD bases (e.g., the selected SD base 235) may include the following: (1) (and in some examples, one or more associated SD oversampling group indices) (2) One or more associated co-phase values (3) One or more associated amplitude values , or any combination thereof.

[0133] In some examples, the pre-decoder associated with the selected SD base 235 can be a non-normalized pre-decoder. In some examples, for even rank (e.g., corresponding to...), The rank of X, where X is the number of selected SD radix-235s, can be represented as follows: In some examples, for odd rank (e.g., the rank corresponding to 2X-1, where...) (where the number of SD base 235s selected is the number of pre-decoders) can be represented as follows: Figure 3 An example of a process flow 300 supporting spatial domain base selection is shown, based on one or more examples as disclosed herein. Process flow 300 may implement various aspects of this disclosure as described herein. Elements described in process flow 300 (e.g., UE 115-b and network entity 105-b) may be examples of similarly named elements as described herein.

[0134] In the following description of process flow 300, operations between various entities or elements may be performed in different order or at different times. Some operations may also be excluded from process flow 300, or other operations may be added. Although various entities or elements are shown as performing operations of process flow 300, some aspects of some operations may also be performed by other entities or elements of process flow 300, or by entities or elements not depicted in the process flow, or any combination thereof.

[0135] At 320, UE 115-b can receive one or more reference signals associated with one or more reference signal measurements.

[0136] At 325, UE 115-b can receive an indication to select one or more co-phase parameters on a per-band basis or on a per-subband basis.

[0137] At 330, UE 115-b can select one or more spatial domain bases from a set of spatial domain bases, based on measurements of one or more reference signals, for channel state information of the type associated with a spatial domain base for each layer. Each spatial domain base in the set is eligible for selection independently of every other spatial domain base in the set, and the number of selected spatial domain bases is based on rank, which is determined by the UE based on measurements of one or more reference signals. In some examples, the rank determined by the UE is two; the first layer associated with the first spatial domain base in the selected one or more spatial domain bases is associated with a first co-phase value; and the second layer associated with the second spatial domain base in the selected one or more spatial domain bases is associated with a second co-phase value. In some examples, the rank may have an odd value; and the first spatial domain base in the selected one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases in the selected one or more spatial domain bases are associated with corresponding layer pairs. In some examples, the selected one or more spatial domain bases are sub-band common. In some examples, the number of one or more spatial domain bases is greater than or equal to a minimum integer value that is greater than half the value of the rank determined by the UE. In some examples, the number of one or more spatial domain bases is less than or equal to the rank value. In some examples, the channel state information associated with one spatial domain base per layer is type I channel state information.

[0138] In some examples, to select one or more spatial domain bases, UE 115-b may generate a layer pair that may include a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first co-phase value associated with the first layer associated with the first spatial domain base is a transpolarity co-phase opposite to a second co-phase value associated with the second layer associated with the first spatial domain base, and wherein the first and second co-phase values ​​are specific to the layer pair. In some examples, to select one or more spatial domain bases, UE 115-b may generate a number of spatial domain bases based on a rank determined by the UE.

[0139] At 335, UE 115-b may sort the corresponding selections of spatial domain bases from the set of spatial domain bases based on the corresponding cophase value associated with each spatial domain base in the selection of spatial domain bases for each of the multiple candidate rank values, and the corresponding number of spatial domain bases included in each selection of spatial domain bases based on the corresponding corresponding candidate rank value.

[0140] At 340, UE 115-b can generate a pre-decoding matrix based on one or more selected spatial domain bases and one or more co-phase parameters. Alternatively, UE 115-b can generate a pre-decoding matrix for each selection of a spatial domain base corresponding to a plurality of candidate rank values, the pre-decoding matrix including an indication of the selection of the spatial domain base and the corresponding co-phase value.

[0141] At position 345, UE 115-b can calculate one or more corresponding interference power values ​​for each candidate rank value and based on each corresponding generated pre-decoding matrix.

[0142] At 350, UE 115-b can calculate the corresponding spectral efficiency value for each candidate rank value and based on one or more corresponding interference power values.

[0143] At 355, UE 115-b can select a spatial domain basis associated with the maximum spectral efficiency based on the corresponding spectral efficiency value, as one or more spatial domain bases.

[0144] At 360°, UE 115-b can apply space domain base-specific co-phase values ​​to a first subset of one or more selected space domain bases, and can also apply one or more codebook-defined co-phase values ​​to a second subset of one or more selected space domain bases. Additionally or alternatively, UE 115-b can apply subband-specific co-phase values ​​to a first subset of one or more selected space domain bases, and can also apply one or more subband-common co-phase values ​​to a second subset of one or more selected space domain bases.

[0145] At position 365, UE 115-b can generate channel quality information based on the pre-decoded matrix.

[0146] At 370, UE 115-b may, based on selection, transmit a report indicating one or more selected spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0147] In some examples, the report may include selection indications that indicate the selected one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate the selected one or more spatial domain bases; and the report does not include ordering indications associated with the selected one or more spatial domain bases.

[0148] In some examples, the report may include selection indications indicating one or more spatial domain bases selected, or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected; and the report may also include a common ordering indication associated with one or more spatial domain bases selected, or multiple individual ordering indications associated with corresponding individual spatial domain bases among the one or more spatial domain bases selected.

[0149] At 375, UE 115-b can indicate, via a layer indicator parameter, the first spatial domain base to which at least one of the selected spatial domain bases, either a spatial domain base-specific cophase value or a subband-specific cophase value, is to be applied.

[0150] Figure 4 A block diagram 400 of a device 405 supporting spatial domain base selection according to one or more examples disclosed herein is shown. Device 405 may be an example of aspects of UE 115 as described herein. Device 405 may include a receiver 410, a transmitter 415, and a communication manager 420. Device 405 or one or more components of device 405 (e.g., receiver 410, transmitter 415, and communication manager 420) may include at least one processor that may be coupled to at least one memory to individually or jointly support or implement the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0151] Receiver 410 may provide components 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 associated with spatial domain base selection). The information may be passed to other components of device 405. Receiver 410 may utilize a single antenna or a collection of antennas.

[0152] Transmitter 415 may provide components for transmitting signals generated by other components of device 405. For example, transmitter 415 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 spatial domain base selection). In some examples, transmitter 415 may be co-located with receiver 410 in a transceiver module. Transmitter 415 may utilize a single antenna or a collection of multiple antennas.

[0153] The communication manager 420, receiver 410, transmitter 415, or various combinations thereof, or various components thereof, may be examples of components for performing various aspects of spatial domain base selection as described herein. For example, the communication manager 420, receiver 410, transmitter 415, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0154] In some examples, the communication manager 420, receiver 410, transmitter 415, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of the following: a processor, digital signal processor (DSP), central processing unit (CPU), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, microcontroller, discrete gate or transistor logic component, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0155] Additionally or alternatively, the communication manager 420, receiver 410, transmitter 415, or various combinations or components thereof may be implemented in code executed by at least one processor (e.g., as communication management software or firmware). If implemented in code executed by at least one processor, the functionality of the communication manager 420, receiver 410, transmitter 415, or various combinations or components thereof may be performed by any combination of a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or these or other programmable logic devices (e.g., configured as or otherwise individually or collectively to support components for performing the functions described in this disclosure).

[0156] In some examples, the communication manager 420 may be configured to use or otherwise cooperate with the receiver 410, transmitter 415, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 420 may receive information from the receiver 410, transmit information to the transmitter 415, or be integrated in combination with the receiver 410, transmitter 415, or both to acquire information, output information, or perform various other operations as described herein.

[0157] Additionally or alternatively, the communication manager 420 may support wireless communication according to examples disclosed herein. For example, the communication manager 420 may be capable of, configured to, or operable to support components for receiving one or more reference signals associated with one or more reference signal measurements. The communication manager 420 may be capable of, configured to, or operable to support components for selecting one or more spatial domain bases based on one or more reference signal measurements from a set of spatial domain bases for reporting channel state information of the type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on rank, which is determined by the UE based on one or more reference signal measurements. The communication manager 420 may be capable of, configured to, or operable to support components for transmitting, based on the selection, reports indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0158] By including or configuring a communication manager 420 according to an example as described herein, device 405 (e.g., controlling receiver 410, transmitter 415, communication manager 420, or a combination thereof or at least one processor coupled thereto) can support techniques for reducing processing, lowering power consumption, more efficient use of communication resources, or any combination thereof.

[0159] Figure 5 A block diagram 500 of a device 505 supporting spatial domain base selection according to one or more examples disclosed herein is shown. Device 505 may be an example of aspects of device 405 or UE 115 as described herein. Device 505 may include receiver 510, transmitter 515, and communication manager 520. Device 505 or one or more components of device 505 (e.g., receiver 510, transmitter 515, and communication manager 520) may include at least one processor that may be coupled to at least one memory to support the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0160] Receiver 510 may provide components 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 associated with spatial domain base selection). The information may be passed to other components of device 505. Receiver 510 may utilize a single antenna or a collection of antennas.

[0161] Transmitter 515 may provide components for transmitting signals generated by other components of device 505. For example, transmitter 515 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 spatial domain base selection). In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0162] Device 505 or its various components may be examples of parts for performing various aspects of spatial domain base selection as described herein. For example, communication manager 520 may include reference signal component 525, SD base component 530, reporting component 535, or any combination thereof. Communication manager 520 may be examples of aspects of communication manager 420 as described herein. In some examples, communication manager 520 or its various components may be configured to use or otherwise cooperate with receiver 510, transmitter 515, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 520 may receive information from receiver 510, transmit information to transmitter 515, or be integrated in combination with receiver 510, transmitter 515, or both to acquire information, output information, or perform various other operations as described herein.

[0163] Communication manager 520 can support wireless communication according to examples disclosed herein. Reference signal component 525 is capable of, configured to, or operable to support components for receiving one or more reference signals associated with one or more reference signal measurements. SD base component 530 is capable of, configured to, or operable to support components for selecting one or more spatial domain bases based on one or more reference signal measurements from a set of spatial domain bases for reporting channel state information of the type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on rank, which is determined by the UE based on one or more reference signal measurements. Reporting component 535 is capable of, configured to, or operable to support components for transmitting, based on selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0164] Figure 6A block diagram 600 of a communication manager 620 supporting spatial domain base selection according to one or more examples disclosed herein is shown. Communication manager 620 may be an example of aspects of communication manager 420, communication manager 520, or both as described herein. Communication manager 620 or its various components may be examples of components for performing various aspects of spatial domain base selection as described herein. For example, communication manager 620 may include a reference signal component 625, an SD base component 630, a reporting component 635, a layer pair component 640, a rank component 645, a co-phase component 650, a layer indicator component 655, a pre-decoding matrix component 660, a channel quality information component 665, a channel state information component 670, an SD base selection component 675, or any combination thereof. Each of these components, or its components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses).

[0165] Additionally or alternatively, the communication manager 620 may support wireless communication according to examples disclosed herein. The reference signal component 625 is capable of, configured to, or operable to support components for receiving one or more reference signals associated with one or more reference signal measurements. The SD base component 630 is capable of, configured to, or operable to support components for selecting one or more spatial domain bases based on one or more reference signal measurements from a set of spatial domain bases for reporting channel state information of a type associated with one spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on rank, which is determined by the UE based on one or more reference signal measurements. The reporting component 635 is capable of, configured to, or operable to support components for transmitting, based on selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0166] In some examples, to support the selection of one or more spatial domain bases, the layer pair component 640 is capable of, configured to, or operable to support components for generating a layer pair including a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

[0167] In some examples, in order to support the selection of one or more spatial domain bases, the SD base component 630 is capable of, can be configured to, or can operate to support components for generating a number of spatial domain bases based on a rank determined by the UE.

[0168] In some examples, the rank determined by the UE is two. In some examples, the first layer associated with a first spatial domain basis among the selected one or more spatial domain bases is associated with a first co-phase value. In some examples, the second layer associated with a second spatial domain basis among the selected one or more spatial domain bases is associated with a second co-phase value.

[0169] In some examples, the rank has an odd value. In some examples, the first spatial basis in one or more selected spatial basis bases is associated with a single layer, and one or more other spatial basis bases in one or more selected spatial basis bases are associated with corresponding layer pairs.

[0170] In some examples, the co-phase component 650 is capable of, configured to, or operable to support means for applying space domain base-specific co-phase values ​​to a first subset of selected one or more space domain bases. In some examples, the co-phase component 650 is capable of, configured to, or operable to support means for applying one or more codebook-defined co-phase values ​​to a second subset of selected one or more space domain bases.

[0171] In some examples, the co-phase component 650 is capable of, configured to, or operable to support components for applying space domain base-specific co-phase values ​​to a first subset of selected one or more space domain bases. In some examples, the co-phase component 650 is capable of, configured to, or operable to support components for applying one or more shared co-phase values ​​across at least two layers to a second subset of selected one or more space domain bases.

[0172] In some examples, the co-phase component 650 is capable of, configured to, or operable to support means for applying subband-specific co-phase values ​​to a first subset of selected one or more spatial domain bases. In some examples, the co-phase component 650 is capable of, configured to, or operable to support means for applying one or more subband-common co-phase values ​​to a second subset of selected one or more spatial domain bases.

[0173] In some examples, the layer indicator component 655 is capable of, configured to, or operable to support a component for indicating, via the layer indicator parameter, a first spatial domain base to be applied to one or more selected spatial domain bases at least one of a spatial domain base-specific cophase value or a subband-specific cophase value.

[0174] In some examples, one or more spatial domain bases are common to subbands.

[0175] In some examples, the co-phase component 650 is capable of, configured to, or operable to support components for receiving instructions to select one or more co-phase parameters on a per-bandwidth or per-subband basis.

[0176] In some examples, the pre-decoding matrix component 660 is capable of, configured to, or operable to support components for generating a pre-decoding matrix based on one or more selected spatial domain bases and one or more co-phase parameters. In some examples, the channel quality information component 665 is capable of, configured to, or operable to support components for generating channel quality information based on the pre-decoding matrix.

[0177] In some examples, the number of one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank determined by the UE. In some examples, the number of one or more spatial domain bases is less than or equal to the value of the rank.

[0178] In some examples, the report includes selection indicators indicating the selected one or more spatial domain bases, or two one-dimensional selection indicators that jointly indicate the selected one or more spatial domain bases. In some examples, the report does not include an ordering indicator associated with the selected one or more spatial domain bases.

[0179] In some examples, the report includes selection indications indicating one or more spatial domain bases selected, or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected. In some examples, the report also includes a common ordering indication associated with one or more spatial domain bases selected, or a set of multiple individual ordering indications associated with corresponding individual spatial domain bases among the one or more selected spatial domain bases.

[0180] In some examples, the channel state information associated with a spatial domain basis for each layer is type I channel state information.

[0181] In some examples, to support the selection of one or more spatial basis bases, the SD basis selection component 675 is capable of, configured to, or operable to support means for sorting corresponding selections of spatial basis bases from the set of spatial basis bases based on corresponding co-phase values ​​associated with each spatial basis base in the selection of spatial basis bases for each candidate rank value in a set of multiple candidate rank values, wherein the corresponding number of spatial basis bases included in each selection of spatial basis bases is based on the corresponding corresponding candidate rank value. In some examples, to support the selection of one or more spatial basis bases, the SD basis selection component 675 is capable of, configured to, or operable to support means for generating a pre-decoding matrix for each selection of spatial basis bases corresponding to a set of multiple candidate rank values, the pre-decoding matrix including an indication of the selection of spatial basis bases and corresponding co-phase values. In some examples, to support the selection of one or more spatial basis bases, the SD basis selection component 675 is capable of, configured to, or operable to support means for calculating one or more corresponding interference power values ​​for each candidate rank value and based on each corresponding generated pre-decoding matrix. In some examples, to support the selection of one or more spatial domain bases, the SD base selection component 675 is capable of, configured to, or operable to support components for calculating a corresponding spectral efficiency value for each candidate rank value based on one or more corresponding interference power values. In some examples, to support the selection of one or more spatial domain bases, the SD base selection component 675 is capable of, configured to, or operable to support components for selecting a spatial domain base associated with the maximum spectral efficiency as one or more spatial domain bases based on a corresponding spectral efficiency value.

[0182] Figure 7 A diagram is shown of a system 700 including a device 705 supporting spatial domain base selection, according to one or more examples disclosed herein. Device 705 may be an example of device 405, device 505, or UE 115 as described herein, or a component thereof. Device 705 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof (e.g., wirelessly). Device 705 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 720, an input / output (I / O) controller 710, a transceiver 715, an antenna 725, at least one memory 730, code 735, and at least one processor 740. These components may communicate electronically or be otherwise coupled (e.g., operative ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 745).

[0183] I / O controller 710 manages the input and output signals of device 705. I / O controller 710 can also manage peripheral devices not integrated into device 705. In some cases, I / O controller 710 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 710 may utilize an operating system such as iOS. ® ANDROID ® MS-DOS ® MS-WINDOWS ® OS / 2 ® UNIX ® LINUX ® Alternatively, the I / O controller 710 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 710 may be implemented as part of one or more processors, such as at least one processor 740. In some cases, a user may interact with the device 705 via the I / O controller 710 or via hardware components controlled by the I / O controller 710.

[0184] In some cases, device 705 may include a single antenna 725. However, in other cases, device 705 may have more than one antenna 725, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. Transceiver 715 may communicate bidirectionally via one or more antennas 725 as described herein, or via a wired or wireless link. For example, transceiver 715 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 715 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 725 for transmission; and demodulating packets received from one or more antennas 725. Transceiver 715, or transceiver 715 and one or more antennas 725, may be an example of transmitter 415, transmitter 515, receiver 410, receiver 510, or any combination thereof or components thereof as described herein.

[0185] At least one memory 730 may include random access memory (RAM) and read-only memory (ROM). At least one memory 730 may store computer-readable, computer-executable code 735, including instructions that, when executed by at least one processor 740, cause device 705 to perform the various functions described herein. Code 735 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 735 may not be directly executable by at least one processor 740, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, among other things, at least one memory 730 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0186] At least one processor 740 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, at least one processor 740 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into at least one processor 740. At least one processor 740 may be configured to execute computer-readable instructions stored in memory (e.g., at least one memory 730) to cause device 705 to perform various functions (e.g., functions or tasks supporting spatial domain base selection). For example, device 705 or components of device 705 may include at least one processor 740 and at least one memory 730 coupled to or coupled to at least one processor 740, wherein at least one processor 740 and at least one memory 730 are configured to perform various functions described herein. In some examples, at least one processor 740 may include multiple processors, and at least one memory 730 may include multiple memories. One or more of a plurality of processors may be coupled to one or more of a plurality of memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 740 may be a component of a processing system, which may refer to a system of machines (such as a series of machines), circuitry (including, for example, one or both of processor circuitry (which may include at least one processor 740) and memory circuitry (which may include at least one memory 730)) or components that receive or receive input and process the input 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. Thus, at least one processor 740 or a processing system including at least one processor 740 may be configured, capable of being configured to, or operable to cause device 705 to perform one or more of the functions described herein. Furthermore, as described herein, “configured to,” “capable of being configured to,” and “operable to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 730 or otherwise.

[0187] Additionally or alternatively, the communication manager 720 may support wireless communication according to examples disclosed herein. For example, the communication manager 720 may be capable of, configured to, or operable to support components for receiving one or more reference signals associated with one or more reference signal measurements. The communication manager 720 may be capable of, configured to, or operable to support components for selecting one or more spatial domain bases based on one or more reference signal measurements from a set of spatial domain bases for reporting channel state information of the type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on rank, which is determined by the UE based on one or more reference signal measurements. The communication manager 720 may be capable of, configured to, or operable to support components for transmitting, based on the selection, reports indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0188] By including or configuring a communication manager 720 according to an example as described herein, device 705 may support techniques for improving communication reliability, reducing latency, improving and reducing processing-related user experience, reducing power consumption, utilizing communication resources more efficiently, improving coordination between devices, extending battery life, improving utilization of processing power, or any combination thereof.

[0189] In some examples, the communication manager 720 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using a transceiver 715, one or more antennas 725, or any combination thereof, or otherwise cooperating with them. For example, the communication manager 720 may be configured to receive or transmit messages or other signaling as described herein via the transceiver 715. Although the communication manager 720 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 720 may be supported by or performed by at least one processor 740, at least one memory 730, code 735, or any combination thereof. For example, code 735 may include instructions that can be executed by at least one processor 740 to cause the device 705 to perform various aspects of spatial domain base selection as described herein, or at least one processor 740 and at least one memory 730 may be otherwise configured to perform or support such operations individually or jointly.

[0190] Figure 8A block diagram 800 of a device 805 supporting spatial domain base selection according to one or more examples disclosed herein is shown. Device 805 may be an example of aspects of network entity 105 as described herein. Device 805 may include receiver 810, transmitter 815, and communication manager 820. Device 805 or one or more components of device 805 (e.g., receiver 810, transmitter 815, and communication manager 820) may include at least one processor that may be coupled to at least one memory to individually or jointly support or implement the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0191] Receiver 810 may provide components for acquiring (e.g., receiving, determining, identifying) information (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). The information may be passed to other components of device 805. In some examples, receiver 810 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 810 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0192] Transmitter 815 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 805. For example, transmitter 815 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 815 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 815 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 815 and receiver 810 may be co-located in a transceiver, which may include or be coupled to a modem.

[0193] The communication manager 820, receiver 810, transmitter 815, or various combinations thereof, or various components thereof, may be examples of components for performing various aspects of spatial domain base selection as described herein. For example, the communication manager 820, receiver 810, transmitter 815, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0194] In some examples, the communication manager 820, receiver 810, transmitter 815, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of a processor, DSP, CPU, ASIC, FPGA, or other programmable logic device, microcontroller, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0195] Additionally or alternatively, the communication manager 820, receiver 810, transmitter 815, or various combinations or components thereof may be implemented in code executed by at least one processor (e.g., as communication management software or firmware). If implemented in code executed by at least one processor, the functionality of the communication manager 820, receiver 810, transmitter 815, or various combinations or components thereof may be performed by any combination of a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or these or other programmable logic devices (e.g., configured as or otherwise individually or collectively to support components for performing the functions described in this disclosure).

[0196] In some examples, the communication manager 820 may be configured to use or otherwise cooperate with the receiver 810, transmitter 815, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 820 may receive information from the receiver 810, transmit information to the transmitter 815, or be integrated in combination with the receiver 810, transmitter 815, or both to acquire information, output information, or perform various other operations as described herein.

[0197] Additionally or alternatively, the communication manager 820 may support wireless communication according to examples disclosed herein. For example, the communication manager 820 may be capable of, configured to, or operable to support components for transmitting one or more reference signals associated with one or more reference signal measurements. The communication manager 820 may be capable of, configured to, or operable to support components for receiving reports associated with channel state information of a type associated with a spatial domain base in each layer, the reports indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with one or more spatial domain bases, rank associated with one or more spatial domain bases, channel quality information associated with one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0198] By including or configuring a communication manager 820 according to an example as described herein, device 805 (e.g., controlling receiver 810, transmitter 815, communication manager 820, or a combination thereof or at least one processor coupled thereto) can support techniques for reducing processing, lowering power consumption, more efficient use of communication resources, or any combination thereof.

[0199] Figure 9 A block diagram 900 of a device 905 supporting spatial domain base selection according to one or more examples disclosed herein is shown. Device 905 may be an example of aspects of device 805 or network entity 105 as described herein. Device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. Device 905, or one or more components of device 905 (e.g., receiver 910, transmitter 915, and communication manager 920), may include at least one processor that may be coupled to at least one memory to support the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0200] Receiver 910 may provide components for acquiring (e.g., receiving, determining, identifying) information (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). The information may be passed to other components of device 905. In some examples, receiver 910 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 910 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0201] Transmitter 915 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 905. For example, transmitter 915 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 915 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 915 and receiver 910 may be co-located in a transceiver, which may include or be coupled to a modem.

[0202] Device 905 or its various components may be examples of parts for performing various aspects of spatial domain base selection as described herein. For example, communication manager 920 may include reference signal component 925, reporting component 930, or any combination thereof. Communication manager 920 may be examples of aspects of communication manager 820 as described herein. In some examples, communication manager 920 or its various components may be configured to use or otherwise cooperate with receiver 910, transmitter 915, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 920 may receive information from receiver 910, transmit information to transmitter 915, or be integrated in combination with receiver 910, transmitter 915, or both to acquire information, output information, or perform various other operations as described herein.

[0203] Communication manager 920 can support wireless communication according to examples disclosed herein. Reference signal component 925 is capable of, configured to, or operable to support components for transmitting one or more reference signals associated with one or more reference signal measurements. Reporting component 930 is capable of, configured to, or operable to support components for receiving reports associated with channel state information of a type associated with a spatial domain base in each layer, the reports indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with one or more spatial domain bases, rank associated with one or more spatial domain bases, channel quality information associated with one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0204] Figure 10 A block diagram 1000 of a communication manager 1020 supporting spatial domain base selection according to one or more examples disclosed herein is shown. The communication manager 1020 may be an example of aspects of a communication manager 820, a communication manager 920, or both as described herein. The communication manager 1020 or its various components may be examples of components for performing various aspects of spatial domain base selection as described herein. For example, the communication manager 1020 may include a reference signal component 1025, a reporting component 1030, an SD base component 1035, a rank component 1040, a co-phase component 1045, a layer indicator component 1050, a channel quality information component 1055, a channel state information component 1060, or any combination thereof. These components, or each of their components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses), and such communication may include communication within protocol layers of the protocol stack, communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack, within devices, components, or virtualization components associated with network entity 105, between devices, components, or virtualization components associated with network entity 105), or any combination thereof.

[0205] Additionally or alternatively, the communication manager 1020 may support wireless communication according to examples disclosed herein. The reference signal component 1025 is capable of, configured to, or operable to support components for transmitting one or more reference signals associated with one or more reference signal measurements. The reporting component 1030 is capable of, configured to, or operable to support components for receiving reports associated with channel state information of a type associated with one spatial domain base in each layer, the reports indicating one or more spatial domain bases from the set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0206] In some examples, one or more spatial domain bases include layer pairs comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

[0207] In some examples, one or more spatial domain bases include spatial domain bases based on the number of rank.

[0208] In some examples, the rank is two. In some examples, the first layer associated with a first spatial basis in one or more spatial basis bases is associated with a first co-phase value. In some examples, the second layer associated with a second spatial basis in one or more spatial basis bases is associated with a second co-phase value.

[0209] In some examples, the rank has an odd value. In some examples, the first spatial domain basis in one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases in one or more spatial domain bases are associated with corresponding layer pairs.

[0210] In some examples, a first subset of one or more spatial domain bases is associated with a co-phase value specific to the spatial domain base. In some examples, a second subset of one or more spatial domain bases is associated with a co-phase value defined by one or more codebooks.

[0211] In some examples, a first subset of one or more spatial domain bases is associated with spatial domain base-specific cophase values. In some examples, a second subset of one or more spatial domain bases is associated with one or more shared cophase values ​​common to at least two layers.

[0212] In some examples, a first subset of one or more spatial domain bases is associated with subband-specific cophase values. In some examples, a second subset of one or more spatial domain bases is associated with one or more common cophase values ​​shared by subbands.

[0213] In some examples, the layer indicator component 1050 is capable of, configured to, or operable to support a component for receiving layer indicator parameters that indicate a first spatial domain base to which at least one of a spatial domain base-specific cophase value or a subband-specific cophase value is to be applied.

[0214] In some examples, one or more spatial domain bases are common to subbands.

[0215] In some examples, the co-phase component 1045 is capable of, can be configured to, or is operable to support components for transmitting indications of selecting one or more co-phase parameters on a per-band or per-subband basis.

[0216] In some examples, the channel quality information component 1055 is capable of, can be configured to, or is operable to support components for receiving channel quality information based on a pre-decoding matrix, which is based on one or more spatial domain bases and one or more co-phase parameters.

[0217] In some examples, the number of one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank. In some examples, the number of one or more spatial domain bases is less than or equal to the value of the rank.

[0218] In some examples, the report includes selection indicators that indicate one or more spatial domain bases, or two one-dimensional selection indicators that jointly indicate one or more spatial domain bases. In some examples, the report does not include ordering indicators associated with one or more spatial domain bases.

[0219] In some examples, the report includes selection indications that indicate one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate one or more spatial domain bases. In some examples, the report also includes a common ordering indication associated with one or more spatial domain bases, or a set of multiple individual ordering indications associated with corresponding individual spatial domain bases in one or more spatial domain bases.

[0220] In some examples, the channel state information associated with a spatial domain basis for each layer is type I channel state information.

[0221] Figure 11 A diagram is shown of a system 1100 including device 1105 supporting spatial domain base selection, according to one or more examples disclosed herein. Device 1105 may be an example of device 805, device 905, or network entity 105 as described herein, or a component including such devices or network entities. Device 1105 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, and such communication may include communication via one or more wired interfaces, one or more wireless interfaces, or any combination thereof. Device 1105 may include components that support output and enable communication, such as a communication manager 1120, a transceiver 1110, an antenna 1115, at least one memory 1125, code 1130, and at least one processor 1135. These components may communicate electronically or otherwise (e.g., operative ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 1140).

[0222] As described herein, transceiver 1110 may support bidirectional communication via a wired link, a wireless link, or both. In some examples, transceiver 1110 may include a wired transceiver and be able to communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, transceiver 1110 may include a wireless transceiver and be able to communicate bidirectionally with another wireless transceiver. In some examples, device 1105 may include one or more antennas 1115 that are capable of (e.g., concurrently) transmitting or receiving wireless transmissions. Transceiver 1110 may also include a modem for modulating signals to provide modulated signals for transmission (e.g., via one or more antennas 1115, via a wired transmitter), for receiving modulated signals (e.g., from one or more antennas 1115, from a wired receiver), and for demodulating signals. In some embodiments, transceiver 1110 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 1115 configured to support various receive or acquire operations, or one or more interfaces coupled to one or more antennas 1115 configured to support various transmit or output operations, or combinations thereof. In some embodiments, transceiver 1110 may include one or more processors or one or more memory components or configured to be coupled to such processors or memory components, which are operable to perform or support operations based on received or acquired information or signals, or to generate information or other signals for transmission or other output, or any combination thereof. In some embodiments, transceiver 1110, or transceiver 1110 and one or more antennas 1115, or transceiver 1110 and one or more antennas 1115 and one or more processors or one or more memory components (e.g., at least one processor 1135, at least one memory 1125, or both) may be included in a chip or chip assembly mounted in device 1105. In some examples, transceiver 1110 may be able to operate to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0223] At least one memory 1125 may include RAM, ROM, or any combination thereof. At least one memory 1125 may store computer-readable, computer-executable code 1130 including instructions that, when executed by one or more of at least one processor 1135, cause device 1105 to perform the various functions described herein. Code 1130 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1130 may not be directly executable by one of the at least one processor 1135, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, at least one memory 1125 may also include a BIOS, among other things, that controls basic hardware or software operation, such as interaction with peripheral components or devices. In some examples, at least one processor 1135 may include multiple processors, and at least one memory 1125 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein (e.g., as part of a processing system).

[0224] At least one processor 1135 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, ASICs, CPUs, FPGAs, microcontrollers, programmable logic devices, discrete gate or transistor logic units, discrete hardware components, or any combination thereof). In some cases, at least one processor 1135 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into one or more of the at least one processor 1135. At least one processor 1135 may be configured to execute computer-readable instructions stored in memory (e.g., one or more memories in at least one memory 1125) to cause device 1105 to perform various functions (e.g., functions or tasks supporting spatial domain base selection). For example, device 1105 or components of device 1105 may include at least one processor 1135 and at least one memory 1125 coupled to one or more of the at least one processor 1135, wherein at least one processor 1135 and at least one memory 1125 are configured to perform the various functions described herein. At least one processor 1135 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that can (e.g., by executing code 1130) host functions for performing the functions of device 1105. At least one processor 1135 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 1105 (such as within one or more memories of at least one memory 1125). In some examples, at least one processor 1135 may include multiple processors, and at least one memory 1125 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 1135 may be a component of a processing system, which may refer to a system of machines (such as a series of machines), circuits (including, for example, one or both of processor circuitry (which may include at least one processor 1135) and memory circuitry (which may include at least one memory 1125)) or components that receive or receive input and process the input 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. Therefore, at least one processor 1135 or a processing system including at least one processor 1135 may be configured, configured to, or operated to cause the device 1105 to perform one or more of the functions described herein.Furthermore, as described herein, “configured to,” “capable of being configured to,” and “capable of operating to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 1125 or otherwise.

[0225] In some examples, bus 1140 may support communication at the protocol layer of the protocol stack (e.g., within a protocol layer). In some examples, bus 1140 may support communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack), which may include communication performed within components of device 1105, or communication performed between different components of device 1105 that are co-addressable or may be located in different locations (e.g., where device 1105 may refer to a system in which one or more of communication manager 1120, transceiver 1110, at least one memory 1125, code 1130 and at least one processor 1135 may be located in one component of different components or partitioned between different components).

[0226] In some examples, the communication manager 1120 may manage (e.g., via one or more wired or wireless backhaul links) various aspects of communication with the core network 130. For example, the communication manager 1120 may manage the transfer of data communication with client devices, such as one or more UEs 115. In some examples, the communication manager 1120 may manage communication with other network entities 105 and may include a controller or scheduler for cooperating with other network entities 105 to control communication with UE 115. In some examples, the communication manager 1120 may support an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0227] Additionally or alternatively, the communication manager 1120 may support wireless communication according to examples disclosed herein. For example, the communication manager 1120 may be capable of, configured to, or operable to support components for transmitting one or more reference signals associated with one or more reference signal measurements. The communication manager 1120 may be capable of, configured to, or operable to support components for receiving reports associated with channel state information of a type associated with a spatial domain base in each layer, the reports indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with one or more spatial domain bases, rank associated with one or more spatial domain bases, channel quality information associated with one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements.

[0228] By including or configuring a communication manager 1120 according to an example as described herein, device 1105 may support techniques for improving communication reliability, reducing latency, improving and reducing processing-related user experience, reducing power consumption, utilizing communication resources more efficiently, improving coordination between devices, extending battery life, improving utilization of processing power, or any combination thereof.

[0229] In some examples, the communication manager 1120 may be configured to use or otherwise coordinate with the transceiver 1110, one or more antennas 1115 (e.g., where applicable), or any combination thereof to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 1120 may be configured to receive or transmit messages or other signaling as described herein via the transceiver 1110. Although the communication manager 1120 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1120 may be supported or performed by the transceiver 1110, one or more processors in at least one processor 1135, one or more memories in at least one memory 1125, code 1130, or any combination thereof (e.g., by a processing system including at least a portion of at least one processor 1135, at least one memory 1125, code 1130, or any combination thereof). For example, code 1130 may include instructions that can be executed by one or more processors of at least one processor 1135 to enable device 1105 to perform various aspects of spatial domain base selection as described herein, or at least one processor 1135 and at least one memory 1125 may be otherwise configured to perform or support such operations individually or jointly.

[0230] Figure 12 A flowchart illustrating a method 1200 for supporting spatial domain base selection according to an example as described herein is shown. The operation of method 1200 can be implemented by a UE or its components as described herein. For example, the operation of method 1200 can be performed by, as referenced... Figures 1 to 7 The UE 115 described herein performs the functions. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0231] At 1205, the method may include: receiving one or more reference signals associated with one or more reference signal measurements. The operation of block 1205 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1205 may be determined by reference... Figure 6 The reference signal component 625 described herein performs the action. Additionally or alternatively, components for performing 1205 may (but are not required to) include, for example, an antenna 725, a transceiver 715, a communication manager 720, a memory 730 (including code 735), a processor 740, and / or a bus 745.

[0232] At 1210, the method may include: selecting one or more spatial domain bases from a set of spatial domain bases based on one or more reference signal measurements for channel state information of a type associated with a spatial domain base at each layer, wherein each spatial domain base in the set of spatial domain bases is eligible for selection independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is based on rank, which is determined by the UE based on one or more reference signal measurements. The operation of block 1210 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1210 may be provided by reference... Figure 6 The described SD base component 630 performs the action. Additionally or alternatively, components for performing 1210 may (but are not required to) include, for example, an antenna 725, a transceiver 715, a communication manager 720, a memory 730 (including code 735), a processor 740, and / or a bus 745.

[0233] At 1215, the method may include: transmitting, based on selection, a report indicating one or more selected spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, a rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof. The operation of block 1215 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1215 may be provided by reference to [reference]. Figure 6The report component 635 described herein is used to perform this action. Additionally or alternatively, components used to perform 1215 may (but are not required to) include, for example, an antenna 725, a transceiver 715, a communication manager 720, a memory 730 (including code 735), a processor 740, and / or a bus 745.

[0234] Figure 13 A flowchart illustrating a method 1300 for supporting spatial domain base selection according to an example as described herein is shown. The operation of method 1300 can be implemented by a network entity or its components as described herein. For example, the operation of method 1300 can be implemented by, as referenced... Figures 1 to 3 as well as Figures 8 to 11 The network entity described performs the function. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described function. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described function.

[0235] At 1305, the method may include: transmitting one or more reference signals associated with one or more reference signal measurements. The operation of block 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1305 may be determined by reference... Figure 10 The reference signal component 1025 described herein performs the action. Additionally or alternatively, the components used to perform 1305 may (but are not required to) include, for example, an antenna 1115, a transceiver 1110, a communication manager 1120, a memory 1125 (including code 1130), a processor 1135, and / or a bus 1140.

[0236] At 1310, the method may include: receiving a report associated with channel state information of a type associated with a spatial domain base at each layer, the report indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are based on one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is based on rank, which is determined based on one or more reference signal measurements. The operation of block 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1310 may be determined by reference to... Figure 10The report component 1030 described herein is used to perform this action. Additionally or alternatively, the components used to perform 1310 may (but are not required to) include, for example, an antenna 1115, a transceiver 1110, a communications manager 1120, a memory 1125 (including code 1130), a processor 1135, and / or a bus 1140.

[0237] The following provides an overview of the various aspects of this disclosure: Aspect 1: A method for wireless communication at a UE, the method comprising: receiving one or more reference signals associated with one or more reference signal measurements; selecting, for the purpose of reporting channel state information of a type associated with a spatial domain base at each layer, one or more spatial domain bases at least partially based on the one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of selected one or more spatial domain bases is at least partially based on a rank determined by the UE at least partially based on the one or more reference signal measurements; and transmitting, at least partially based on the selection, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof.

[0238] Aspect 2: According to the method of aspect 1, selecting the one or more spatial domain bases includes: generating a layer pair including a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

[0239] Aspect 3: According to the method of aspect 2, selecting the one or more spatial domain bases further includes: generating a number of spatial domain bases based at least in part on the rank determined by the UE.

[0240] Aspect 4: The method according to any one of Aspects 1 to 3, wherein the rank determined by the UE is two; the first layer associated with a first spatial domain basis among the selected one or more spatial domain bases is associated with a first co-phase value; and the second layer associated with a second spatial domain basis among the selected one or more spatial domain bases is associated with a second co-phase value.

[0241] Aspect 5: The method according to any one of Aspects 1 to 4, wherein the rank has an odd value; and the first spatial domain basis of the selected one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases of the selected one or more spatial domain bases are associated with a corresponding layer pair.

[0242] Aspect 6: The method according to any one of aspects 1 to 5, the method further comprising: applying spatial domain basis-specific cophase values ​​to a first subset of the selected one or more spatial domain bases; and applying one or more codebook-defined cophase values ​​to a second subset of the selected one or more spatial domain bases.

[0243] Aspect 7: The method according to any one of aspects 1 to 6, the method further comprising: applying spatial domain basis-specific cophase values ​​to a first subset of the selected one or more spatial domain bases; and applying one or more shared cophase values ​​common to at least two layers to a second subset of the selected one or more spatial domain bases.

[0244] Aspect 8: The method according to any one of aspects 1 to 7, the method further comprising: applying a subband-specific cophase value to a first subset of the selected one or more spatial domain bases; and applying a common cophase value of one or more subbands to a second subset of the selected one or more spatial domain bases.

[0245] Aspect 9: The method according to any one of aspects 1 to 8, the method further comprising: indicating, via a layer indicator parameter, a first spatial domain basis to which at least one of a spatial domain basis-specific co-phase value or a subband-specific co-phase value is to be applied among one or more selected spatial domain basis bases.

[0246] Aspect 10: The method according to any one of aspects 1 to 9, wherein one or more selected spatial domain bases are common to subbands.

[0247] Aspect 11: The method according to any one of aspects 1 to 10, the method further comprising: receiving an indication to select the one or more co-phase parameters on a per-bandwidth basis or on a per-subband basis.

[0248] Aspect 12: The method according to any one of aspects 1 to 11, the method further comprising: generating a pre-decoding matrix at least in part based on one or more selected spatial domain bases and the one or more co-phase parameters; and generating the channel quality information at least in part based on the pre-decoding matrix.

[0249] Aspect 13: The method according to any one of Aspects 1 to 12, wherein the number of the one or more spatial domain bases is greater than or equal to a minimum integer value that is greater than half the value of the rank determined by the UE; and the number of the one or more spatial domain bases is less than or equal to the value of the rank.

[0250] Aspect 14: The method according to any one of Aspects 1 to 13, wherein the report includes a selection indication indicating one or more spatial domain bases selected or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected; and the report does not include an ordering indication associated with the one or more spatial domain bases selected.

[0251] Aspect 15: The method according to any one of Aspects 1 to 14, wherein the report includes a selection indication indicating one or more spatial domain bases selected or two one-dimensional selection indications jointly indicating one or more spatial domain bases selected; and the report further includes a common ordering indication associated with one or more spatial domain bases selected or a plurality of individual ordering indications associated with corresponding individual spatial domain bases among the one or more spatial domain bases selected.

[0252] Aspect 16: The method according to any one of Aspects 1 to 15, wherein the channel state information of the type associated with a spatial domain basis of each layer is type I channel state information.

[0253] Aspect 17: The method according to any one of Aspects 1 to 16, wherein selecting the one or more spatial domain bases comprises: for each of a plurality of candidate rank values, sorting corresponding selections of spatial domain bases from the set of spatial domain bases at least in part based on a corresponding co-phase value associated with each spatial domain base in the selections of spatial domain bases, wherein the corresponding number of spatial domain bases included in each selection of spatial domain bases is at least in part based on the corresponding corresponding candidate rank value; generating a pre-decoding matrix for each selection of spatial domain bases corresponding to the plurality of candidate rank values, the pre-decoding matrix including an indication of the selection of spatial domain bases and the corresponding co-phase value; calculating one or more corresponding interference power values ​​for each candidate rank value and at least in part based on each corresponding generated pre-decoding matrix; calculating a corresponding spectral efficiency value for each candidate rank value and at least in part based on the one or more corresponding interference power values; and selecting the selection of spatial domain bases associated with the maximum spectral efficiency as the one or more spatial domain bases, at least in part based on the corresponding spectral efficiency value.

[0254] Aspect 18: A method for wireless communication at a network entity, the method comprising: transmitting one or more reference signals associated with one or more reference signal measurements; and receiving a report associated with channel state information of a type associated with a spatial domain base at each layer, the report indicating one or more spatial domain bases from a set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, a rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof, wherein the one or more spatial domain bases are at least partially based on the one or more reference signal measurements, wherein each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and wherein the number of the one or more spatial domain bases is at least partially based on the rank, which is determined at least partially based on the one or more reference signal measurements.

[0255] Aspect 19: According to the method of aspect 18, wherein the one or more spatial domain bases include a layer pair, the layer pair including a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

[0256] Aspect 20: According to the method of aspect 19, wherein the one or more spatial domain bases comprise spatial domain bases at least in part based on the number of the rank.

[0257] Aspect 21: The method according to any one of aspects 18 to 20, wherein the rank is two; a first layer associated with a first spatial domain basis in the one or more spatial domain bases is associated with a first co-phase value; and a second layer associated with a second spatial domain basis in the one or more spatial domain bases is associated with a second co-phase value.

[0258] Aspect 22: The method according to any one of aspects 18 to 21, wherein the rank has an odd value; and a first spatial domain basis in the one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases in the one or more spatial domain bases are associated with a corresponding layer pair.

[0259] Aspect 23: The method according to any one of aspects 18 to 22, wherein a first subset of the one or more spatial domain bases is associated with a cophase value specific to the spatial domain base; and a second subset of the one or more spatial domain bases is associated with a cophase value defined by one or more codebooks.

[0260] Aspect 24: The method according to any one of aspects 18 to 23, wherein a first subset of the one or more spatial domain bases is associated with a spatial domain base-specific cophase value; and a second subset of the one or more spatial domain bases is associated with one or more shared cophase values ​​common to at least two layers.

[0261] Aspect 25: The method according to any one of aspects 18 to 24, wherein a first subset of the one or more spatial domain bases is associated with a subband-specific cophase value; and a second subset of the one or more spatial domain bases is associated with a common cophase value of the one or more subbands.

[0262] Aspect 26: The method according to any one of aspects 18 to 25, the method further comprising: receiving a layer indicator parameter, the layer indicator parameter indicating a first spatial domain basis to which at least one of a spatial domain basis-specific co-phase value or a subband-specific co-phase value is to be applied in the one or more spatial domain basis bases.

[0263] Aspect 27: The method according to any one of aspects 18 to 26, wherein the one or more spatial domain bases are subband common.

[0264] Aspect 28: The method according to any one of aspects 18 to 27, the method further comprising: sending an indication to select the one or more co-phase parameters on a per-band or per-subband basis.

[0265] Aspect 29: The method according to any one of Aspects 18 to 28, the method further comprising: receiving the channel quality information, the channel quality information being at least partially based on a pre-decoding matrix, the pre-decoding matrix being at least partially based on the one or more spatial domain bases and the one or more co-phase parameters.

[0266] Aspect 30: The method according to any one of aspects 18 to 29, wherein the number of the one or more spatial domain bases is greater than or equal to a minimum integer value that is greater than half the value of the rank; and the number of the one or more spatial domain bases is less than or equal to the value of the rank.

[0267] Aspect 31: The method according to any one of Aspects 18 to 30, wherein the report includes a selection indication indicating the one or more spatial domain bases or two one-dimensional selection indications jointly indicating the one or more spatial domain bases; and the report does not include an ordering indication associated with the one or more spatial domain bases.

[0268] Aspect 32: The method according to any one of Aspects 18 to 31, wherein the report includes a selection indication indicating the one or more spatial domain bases or two one-dimensional selection indications jointly indicating the one or more spatial domain bases; and the report further includes a common ordering indication associated with the one or more spatial domain bases or a plurality of individual ordering indications associated with a corresponding individual spatial domain base in the one or more spatial domain bases.

[0269] Aspect 33: The method according to any one of aspects 18 to 32, wherein the channel state information of the type associated with a spatial domain basis of each layer is type I channel state information.

[0270] Aspect 34: An apparatus for wireless communication, the apparatus comprising a memory; a transceiver; and at least one processor of a UE, the at least one processor being coupled to the memory and the transceiver, and the at least one processor being configured to cause the apparatus to perform a method according to any one of aspects 1 to 17.

[0271] Aspect 35: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to any one of aspects 1 to 17.

[0272] Aspect 36: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method according to any one of aspects 1 to 17.

[0273] Aspect 37: An apparatus for wireless communication, the apparatus comprising: a memory; and at least one processor coupled to the memory, the at least one processor being configured to cause the apparatus to perform a method according to any one of aspects 18 to 33.

[0274] Aspect 38: A network entity for wireless communication, the network entity comprising at least one component for performing the method according to any one of aspects 18 to 33.

[0275] Aspect 39: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method according to any one of aspects 18 to 33.

[0276] It should be noted that the methods described herein describe possible specific implementations, and the operations and steps can be rearranged or otherwise modified, and other specific implementations are also possible. Furthermore, aspects from two or more of these methods can be combined.

[0277] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein are also applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described are applicable to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0278] The information and signals described herein can be represented using any of a variety of different techniques and skills. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0279] The various exemplary blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in alternative embodiments, a 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 cooperating with a DSP core, or any other such configuration). Any function or operation described herein that can be performed by a processor can be performed by multiple processors capable of performing the described functions or operations individually or jointly.

[0280] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When implemented using software executed by a processor, the functions can be stored as one or more instructions or code on a computer-readable medium or transmitted using one or more instructions or code on a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including various portions distributed such that the functions are implemented in different physical locations.

[0281] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible 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, compressed optical disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Disks can magnetically reproduce data, and optical discs can optically reproduce data using lasers. Combinations of the above are also included within the scope of computer-readable media. Any function or operation described herein that can be performed by memory can be performed by multiple memories capable of performing the described function or operation individually or jointly.

[0282] As used herein, the word "or" in a list of items (e.g., a list of items accompanied by phrases such as "at least one of" or "one or more of") in the claims indicates an inclusive list, such that a list of at least one of, for example, 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). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0283] As used herein, including in claims, the article “a” preceding a noun is open-ended and is understood to refer to “at least one” or “one or more” of those nouns. Therefore, the terms “a,” “at least one,” “one or more,” and “at least one of one or more” are interchangeable. For example, where a claim enumerates “components” performing 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 “component” having a characteristic or performing a function may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent references to a component introduced with the article “a” using the terms “the” or “the” can refer to any or all of the one or more components. For example, a component introduced with the article “a” can be understood to mean “one or more components,” and subsequent reference to “the component” in a claim can be understood as equivalent to referring to “at least one of the one or more components.” Similarly, subsequent references to a component introduced with the terms “the” or “the” as “one or more components” can refer to any or all of the one or more components. For example, reference to "the one or more components" in the subsequent claims can be understood as equivalent to reference to "at least one of the one or more components".

[0284] The term "determine" encompasses a wide range of actions, and therefore, "determine" can include calculation, computation, processing, derivation, investigation, lookup (such as by searching in a table, database, or other data structure), identification, and similar actions. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory), and so on. Moreover, "determine" can include parsing, obtaining, selecting, choosing, creating, and other similar actions.

[0285] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate them. If only the first reference numeral is used in the description, the description can be applied to any of the similar components having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0286] The description herein, illustrated with reference to the accompanying drawings, describes an example configuration and does not represent all achievable examples or those within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," not "preferred" or "advantageous over other examples." The detailed description includes specific details used to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0287] The description herein is provided to enable those skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication, the apparatus comprising: Memory; transceiver; and At least one processor of user equipment (UE), said at least one processor being coupled to the memory and the transceiver and configured to cause the device to: Receive one or more reference signals associated with one or more reference signal measurements via the transceiver; For channel state information of a type associated with a spatial basis for each layer, one or more spatial basis units are selected from a set of spatial basis units that are at least partially based on measurements of the one or more reference signals, wherein each spatial basis unit in the set is eligible for selection independently of each other spatial basis unit in the set, and wherein the number of selected one or more spatial basis units is at least partially based on rank, which is determined by the UE at least partially based on measurements of the one or more reference signals; and The transceiver transmits, at least in part, a report indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof, via the transceiver.

2. The apparatus according to claim 1, wherein, In order to select the one or more spatial domain bases, the at least one processor is further configured to cause the device to: A layer pair is generated comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

3. The apparatus according to claim 2, wherein, In order to select the one or more spatial domain bases, the at least one processor is further configured to cause the device to: A certain number of spatial domain bases are generated, at least in part, based on the rank determined by the UE.

4. The apparatus according to claim 1, wherein: The rank determined by the UE is two; The first layer associated with the first spatial domain basis in one or more selected spatial domain bases is associated with the first co-phase value; and The second layer associated with the second spatial domain basis in one or more selected spatial domain bases is associated with the second cophase value.

5. The apparatus according to claim 1, wherein: The rank has an odd value; and The first spatial domain basis among the selected one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases among the selected one or more spatial domain bases are associated with the corresponding layer pairs.

6. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: Apply spatial domain basis-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and Apply one or more codebook-defined cophase values ​​to a second subset of the selected one or more spatial domain bases.

7. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: Apply spatial domain basis-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and Apply one or more shared cophase values ​​across at least two layers to a second subset of the selected one or more spatial domain bases.

8. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: Apply subband-specific cophase values ​​to a first subset of one or more selected spatial domain bases; and Apply one or more subband common cophase values ​​to a second subset of the selected one or more spatial domain bases.

9. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: The first spatial domain basis is selected by using the layer indicator parameter to indicate at least one of the following: spatial domain basis-specific cophase value or subband-specific cophase value to be applied to it.

10. The apparatus according to claim 1, wherein: The selected one or more spatial domain bases are common to the subbands.

11. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: The transceiver receives an indication to select one or more co-phase parameters on a per-band or per-subband basis.

12. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: The pre-decoding matrix is ​​generated at least in part based on one or more selected spatial domain bases and the one or more co-phase parameters; and The channel quality information is generated at least in part based on the pre-decoding matrix.

13. The apparatus according to claim 1, wherein: The number of the one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank determined by the UE; and The number of the one or more spatial domain bases is less than or equal to the value of the rank.

14. The apparatus according to claim 1, wherein: The report includes selection indicators indicating one or more spatial domain bases selected, or two one-dimensional selection indicators jointly indicating one or more spatial domain bases selected; and The report does not include an ordering indication associated with one or more selected spatial domain bases.

15. The apparatus according to claim 1, wherein: The report includes selection indicators indicating one or more spatial domain bases selected, or two one-dimensional selection indicators jointly indicating one or more spatial domain bases selected; and The report also includes a common ordering indication associated with one or more selected spatial domain bases, or multiple individual ordering indications associated with corresponding individual spatial domain bases among the one or more selected spatial domain bases.

16. The apparatus according to claim 1, wherein: The channel state information of this type associated with a spatial domain basis for each layer is type I channel state information.

17. The apparatus according to claim 1, wherein, In order to select the one or more spatial domain bases, the at least one processor is further configured to cause the device to: For each of a plurality of candidate rank values, the corresponding selections of spatial domain bases from the set of spatial domain bases are sorted at least in part based on the corresponding cophase value associated with each spatial domain base in the selections of spatial domain bases, wherein the corresponding number of spatial domain bases included in each selection of spatial domain bases is at least in part based on the corresponding corresponding candidate rank value. For each selection of the spatial basis corresponding to the plurality of candidate rank values, a pre-decoding matrix is ​​generated, the pre-decoding matrix including an indication of the selection of the spatial basis and the corresponding co-phase value; For each candidate rank value and based at least in part on each corresponding generated pre-decoding matrix, calculate one or more corresponding interference power values; For each candidate rank value and based at least in part on the one or more corresponding interference power values, calculate the corresponding spectral efficiency value; and The selection of spatial domain bases associated with the maximum spectral efficiency is chosen, at least in part, based on the corresponding spectral efficiency value, as the one or more spatial domain bases.

18. An apparatus for wireless communication, the apparatus comprising: Memory; and At least one processor of the network entity, said at least one processor being coupled to the memory and configured to cause the device to: Send one or more reference signals associated with one or more reference signal measurements; as well as Receive a report associated with channel state information of a type associated with a spatial domain basis at each layer, the report indicating one or more spatial domain bases from the set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, the rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof. The one or more spatial domain bases are at least partially based on the one or more reference signals, each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and the number of the one or more spatial domain bases is at least partially based on the rank, which is at least partially based on the one or more reference signals.

19. The apparatus of claim 18, wherein the one or more spatial domain bases comprise a layer pair, the layer pair comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

20. The apparatus of claim 19, wherein the one or more spatial domain bases comprise spatial domain bases at least in part based on the number of the rank.

21. The apparatus according to claim 18, wherein: The rank is two; The first layer associated with the first spatial domain basis in the one or more spatial domain bases is associated with the first co-phase value; and The second layer associated with the second spatial domain basis in the one or more spatial domain bases is associated with the second co-phase value.

22. The apparatus of claim 18, wherein: The rank has an odd value; and The first spatial domain basis in the one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases in the one or more spatial domain bases are associated with corresponding layer pairs.

23. The apparatus of claim 18, wherein: A first subset of the one or more spatial domain bases is associated with a specific cophase value of the spatial domain base; and A second subset of the one or more spatial domain bases is associated with one or more cophase values ​​defined by a codebook.

24. The apparatus of claim 18, wherein: A first subset of the one or more spatial domain bases is associated with a specific cophase value of the spatial domain base; and A second subset of the one or more spatial domain bases is associated with one or more shared cophase values ​​common to at least two layers.

25. The apparatus of claim 18, wherein: A first subset of the one or more spatial domain bases is associated with subband-specific cophase values; and A second subset of the one or more spatial domain bases is associated with a common cophase value of one or more subbands.

26. The apparatus of claim 18, wherein the at least one processor is further configured to cause the apparatus to: The receiving layer indicator parameter indicates a first spatial domain basis to which at least one of the one or more spatial domain bases, either a spatial domain base-specific co-phase value or a subband-specific co-phase value, is to be applied.

27. The apparatus according to claim 18, wherein: The one or more spatial domain bases are common to the subbands.

28. The apparatus of claim 18, wherein the at least one processor is further configured to cause the apparatus to: Send an indication that the user equipment (UE) will select one or more co-phase parameters on a per-band basis or on a per-subband basis.

29. The apparatus of claim 18, wherein the at least one processor is further configured to cause the apparatus to: The channel quality information is received, which is at least partially based on a pre-decoding matrix, which is at least partially based on the one or more spatial domain bases and the one or more co-phase parameters.

30. The apparatus of claim 18, wherein: The number of the one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank; and The number of the one or more spatial domain bases is less than or equal to the value of the rank.

31. The apparatus according to claim 18, wherein: The report includes selection indications for the one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate the one or more spatial domain bases; and The report does not include sorting indications associated with the one or more spatial domain bases.

32. The apparatus of claim 18, wherein: The report includes selection indications for the one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate the one or more spatial domain bases; and The report also includes a common ordering indication associated with the one or more spatial domain bases, or multiple individual ordering indications associated with the respective individual spatial domain bases in the one or more spatial domain bases.

33. The apparatus according to claim 18, wherein: The channel state information of this type associated with a spatial domain basis for each layer is type I channel state information.

34. A method for conducting wireless communication at a user equipment (UE), the method comprising: Receive one or more reference signals associated with one or more reference signal measurements; For channel state information of a type associated with a spatial basis for each layer, one or more spatial basis units are selected from a set of spatial basis units that are at least partially based on measurements of the one or more reference signals, wherein each spatial basis unit in the set is eligible for selection independently of each other spatial basis unit in the set, and wherein the number of selected one or more spatial basis units is at least partially based on rank, which is determined by the UE at least partially based on measurements of the one or more reference signals; and Reports indicating the selected one or more spatial domain bases, one or more co-phase parameters associated with the selected one or more spatial domain bases, the rank associated with the selected one or more spatial domain bases, channel quality information associated with the selected one or more spatial domain bases, or any combination thereof, are transmitted at least in part based on the selection.

35. The method of claim 34, wherein selecting the one or more spatial domain bases comprises: A layer pair is generated comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

36. The method of claim 35, wherein selecting the one or more spatial domain bases further comprises: A certain number of spatial domain bases are generated, at least in part, based on the rank determined by the UE.

37. The method of claim 34, wherein: The rank determined by the UE is two; The first layer associated with the first spatial domain basis in one or more selected spatial domain bases is associated with the first co-phase value; and The second layer associated with the second spatial domain basis in one or more selected spatial domain bases is associated with the second cophase value.

38. The method of claim 34, wherein: The rank has an odd value; and The first spatial domain basis among the selected one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases among the selected one or more spatial domain bases are associated with the corresponding layer pairs.

39. The method of claim 34, further comprising: Apply spatial domain basis-specific cophase values ​​to a first subset of one or more selected spatial domain bases; as well as Apply one or more codebook-defined cophase values ​​to a second subset of the selected one or more spatial domain bases.

40. The method of claim 34, further comprising: Apply spatial domain basis-specific cophase values ​​to a first subset of one or more selected spatial domain bases; as well as Apply one or more shared cophase values ​​across at least two layers to a second subset of the selected one or more spatial domain bases.

41. The method of claim 34, further comprising: Apply subband-specific cophase values ​​to a first subset of one or more selected spatial domain bases; as well as Apply one or more subband common cophase values ​​to a second subset of the selected one or more spatial domain bases.

42. The method according to claim 34, further comprising: The first spatial domain basis is selected by using the layer indicator parameter to indicate at least one of the following: spatial domain basis-specific cophase value or subband-specific cophase value to be applied to it.

43. The method of claim 34, wherein the selected one or more spatial domain bases are common to subbands.

44. The method according to claim 34, further comprising: Receive an instruction to select one or more co-phase parameters on a per-band or per-subband basis.

45. The method of claim 34, further comprising: The pre-decoding matrix is ​​generated at least in part based on one or more selected spatial domain bases and the one or more co-phase parameters; as well as The channel quality information is generated at least in part based on the pre-decoding matrix.

46. ​​The method of claim 34, wherein: The number of the one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank determined by the UE; and The number of the one or more spatial domain bases is less than or equal to the value of the rank.

47. The method of claim 34, wherein: The report includes selection indicators indicating one or more spatial domain bases selected, or two one-dimensional selection indicators jointly indicating one or more spatial domain bases selected; and The report does not include an ordering indication associated with one or more selected spatial domain bases.

48. The method of claim 34, wherein: The report includes selection indicators indicating one or more spatial domain bases selected, or two one-dimensional selection indicators jointly indicating one or more spatial domain bases selected; and The report also includes a common ordering indication associated with one or more selected spatial domain bases, or multiple individual ordering indications associated with corresponding individual spatial domain bases among the one or more selected spatial domain bases.

49. The method of claim 34, wherein the channel state information of the type associated with a spatial domain basis for each layer is type I channel state information.

50. The method of claim 34, wherein selecting the one or more spatial domain bases comprises: For each of a plurality of candidate rank values, the corresponding selections of spatial domain bases from the set of spatial domain bases are sorted at least in part based on the corresponding cophase value associated with each spatial domain base in the selections of spatial domain bases, wherein the corresponding number of spatial domain bases included in each selection of spatial domain bases is at least in part based on the corresponding corresponding candidate rank value. For each selection of the spatial basis corresponding to the plurality of candidate rank values, a pre-decoding matrix is ​​generated, the pre-decoding matrix including an indication of the selection of the spatial basis and the corresponding co-phase value; For each candidate rank value and based at least in part on each corresponding generated pre-decoding matrix, calculate one or more corresponding interference power values; For each candidate rank value and based at least in part on the one or more corresponding interference power values, calculate the corresponding spectral efficiency value; and The selection of spatial domain bases associated with the maximum spectral efficiency is chosen, at least in part, based on the corresponding spectral efficiency value, as the one or more spatial domain bases.

51. A method for conducting wireless communication at a network entity, the method comprising: Send one or more reference signals associated with one or more reference signal measurements; as well as Receive a report associated with channel state information of a type associated with a spatial domain basis at each layer, the report indicating one or more spatial domain bases from the set of spatial domain bases, one or more co-phase parameters associated with the one or more spatial domain bases, the rank associated with the one or more spatial domain bases, channel quality information associated with the one or more spatial domain bases, or any combination thereof. The one or more spatial domain bases are at least partially based on the one or more reference signal measurements, each spatial domain base in the set of spatial domain bases is eligible to be selected independently of each other spatial domain base in the set of spatial domain bases, and the number of the one or more spatial domain bases is at least partially based on the rank, which is determined at least partially based on the one or more reference signal measurements.

52. The method of claim 51, wherein the one or more spatial domain bases comprise a layer pair, the layer pair comprising a first layer associated with a first spatial domain base and a second layer associated with the first spatial domain base, wherein a first cophase value associated with the first layer associated with the first spatial domain base is a transpolarization cophase opposite to a second cophase value associated with the second layer associated with the first spatial domain base, and wherein the first cophase value and the second cophase value are specific to the layer pair.

53. The method of claim 52, wherein the one or more spatial domain bases comprise spatial domain bases that are at least partially based on the number of rank.

54. The method according to claim 51, wherein: The rank is two; The first layer associated with the first spatial domain basis in the one or more spatial domain bases is associated with the first co-phase value; and The second layer associated with the second spatial domain basis in the one or more spatial domain bases is associated with the second co-phase value.

55. The method of claim 51, wherein: The rank has an odd value; and The first spatial domain basis in the one or more spatial domain bases is associated with a single layer, and one or more other spatial domain bases in the one or more spatial domain bases are associated with corresponding layer pairs.

56. The method of claim 51, wherein: A first subset of the one or more spatial domain bases is associated with a specific cophase value of the spatial domain base; and A second subset of the one or more spatial domain bases is associated with one or more cophase values ​​defined by a codebook.

57. The method of claim 51, wherein: A first subset of the one or more spatial domain bases is associated with a specific cophase value of the spatial domain base; and A second subset of the one or more spatial domain bases is associated with one or more shared cophase values ​​common to at least two layers.

58. The method of claim 51, wherein: A first subset of the one or more spatial domain bases is associated with subband-specific cophase values; and A second subset of the one or more spatial domain bases is associated with a common cophase value of one or more subbands.

59. The method according to claim 51, further comprising: The receiving layer indicator parameter indicates a first spatial domain basis to which at least one of the one or more spatial domain bases, either a spatial domain base-specific co-phase value or a subband-specific co-phase value, is to be applied.

60. The method of claim 51, wherein the one or more spatial domain bases are subband common.

61. The method according to claim 51, further comprising: Send an indication that the user equipment (UE) will select one or more co-phase parameters on a per-band basis or on a per-subband basis.

62. The method according to claim 51, further comprising: The channel quality information is received, which is at least partially based on a pre-decoding matrix, which is at least partially based on the one or more spatial domain bases and the one or more co-phase parameters.

63. The method according to claim 51, wherein: The number of the one or more spatial domain bases is greater than or equal to the smallest integer value that is greater than half the value of the rank; and The number of the one or more spatial domain bases is less than or equal to the value of the rank.

64. The method of claim 51, wherein: The report includes selection indications for the one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate the one or more spatial domain bases; and The report does not include sorting indications associated with the one or more spatial domain bases.

65. The method of claim 51, wherein: The report includes selection indications for the one or more spatial domain bases, or two one-dimensional selection indications that jointly indicate the one or more spatial domain bases; and The report also includes a common ordering indication associated with the one or more spatial domain bases, or multiple individual ordering indications associated with the respective individual spatial domain bases in the one or more spatial domain bases.

66. The method of claim 51, wherein the channel state information of the type associated with a spatial domain basis at each layer is type I channel state information.

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