WO2025073101A1

WO2025073101A1 - Doppler basis selection for multiple transmission reception points

Info

Publication number: WO2025073101A1
Application number: PCT/CN2023/123132
Authority: WO
Inventors: Jing Dai; Liangming WU; Wanshi Chen; Hao Xu
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2025-04-10
Anticipated expiration: 2026-04-07

Abstract

Methods, systems, and devices for wireless communications are described. The method may include receiving one or more reference signals from a set of multiple transmission reception points, generating, based on receiving the one or more reference signals, a coherent joint transmission precoding matrix indicator (PMI) associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points, and transmitting a report including an indication of the coherent joint transmission PMI.

Description

DOPPLER BASIS SELECTION FOR MULTIPLE TRANSMISSION RECEPTION POINTS

FIELD OF TECHNOLOGY

The following relates to wireless communications, including Doppler basis selection for multiple transmission reception points.

BACKGROUND

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support Doppler basis selection for multiple transmission reception points. For example, the described techniques provide for receiving one or more reference signals from a set of multiple transmission reception points, generating, based on receiving the one or more reference signals, a coherent joint transmission precoding matrix indicator (PMI) associated with the set of multiple transmission reception points, where the coherent joint transmission PMI may include one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points, and transmitting a report including an indication of the coherent joint transmission PMI.

A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the UE to receive one or more reference signals from a set of multiple transmission reception points, generate, based on receiving the one or more reference signals, a coherent joint transmission associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points, and transmit a report including an indication of the coherent joint transmission PMI.

Another UE for wireless communications is described. The UE may include means for receiving one or more reference signals from a set of multiple transmission reception points, means for generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points, and means for transmitting a report including an indication of the coherent joint transmission PMI.

A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by a processor to receive one or more reference signals from a set of multiple transmission reception points, generate, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points, and transmit a report including an indication of the coherent joint transmission PMI.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting a common Doppler basis selection for all transmission reception points of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting a Doppler offset value for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the Doppler offset value includes a non-oversampled Doppler offset value and a sample quantity for the non-oversampled Doppler offset value may be an integer value corresponding to a Doppler basis length.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the Doppler offset value includes a oversampled Doppler offset value and a sample quantity of the oversampled Doppler offset value may be a multiple value of Doppler basis length.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a quantity of values of the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be less than a total quantity of transmission reception points of the set of multiple transmission reception points and the quantity of values of the Doppler offset value represent a relative offset with respect to a reference transmission reception point of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be common for all layers of a set of multiple layers associated with the PMI.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be layer-specific for a set of multiple layers associated with the PMI.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting an independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting an oversampling group index for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting a quantity of oversampling group indices that may be less than a total quantity of transmission reception points of the set of multiple transmission reception points, where the oversampling group indices may be relative to an oversampling group index corresponding to a reference transmission reception point of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the oversampling group index for each transmission reception point of the set of multiple transmission reception points may be common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points, the oversampling group index for each transmission reception point of the set of multiple transmission reception points, or both, may be layer-specific for a set of multiple layers associated with the PMI.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator may be defined across all selected Doppler bases associated with the one or more Doppler-domain components.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator may be aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting a non-zero coefficient bitmap, where frequency domain and time domain components associated with the non-zero coefficient bitmap may be reported as a paired coefficient.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the report may include operations, features, means, or instructions for transmitting a first stage bitmap having a size that may be based on a quantity of the set of multiple transmission reception points and a quantity of layers associated with the PMI and transmitting a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that may be indicated as non-zero by the first stage bitmap.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one or more reference signals received from the set of multiple transmission reception points may be configured with a same transmission periodicity and an occasion offset difference between reference signal transmissions may be configured to be less than or equal to a offset threshold duration.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one or more reference signals received from the set of multiple transmission reception points may be configured with transmission triggers having a triggering offset difference that may be less than or equal to a trigger threshold duration.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the coherent joint transmission PMI includes a type-II channel state information PMI.

A method for wireless communications by a network entity is described. The method may include transmitting one or more reference signals to a UE, receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points, and scheduling one or more resources for communication with the UE based on receiving the report.

A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the network entity to transmit one or more reference signals to a UE, receive a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points, and schedule one or more resources for communication with the UE based on receiving the report.

Another network entity for wireless communications is described. The network entity may include means for transmitting one or more reference signals to a UE, means for receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points, and means for scheduling one or more resources for communication with the UE based on receiving the report.

A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by a processor to transmit one or more reference signals to a UE, receive a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points, and schedule one or more resources for communication with the UE based on receiving the report.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving a common Doppler basis selection for all transmission reception points of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving a Doppler offset value for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the Doppler offset value includes a non-oversampled Doppler offset value and a sample quantity for the non-oversampled Doppler offset value may be an integer value corresponding to a Doppler basis length.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the Doppler offset value includes a oversampled Doppler offset value and a sample quantity of the oversampled Doppler offset value may be a multiple value of Doppler basis length.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, a quantity of values of the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be less than a total quantity of transmission reception points of the set of multiple transmission reception points and the quantity of values of the Doppler offset value represent a relative offset with respect to a reference transmission reception point of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be common for all layers of a set of multiple layers associated with the PMI.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points may be layer-specific for a set of multiple layers associated with the PMI.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving an independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving an oversampling group index for each transmission reception point of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving a quantity of oversampling group indices that may be less than a total quantity of transmission reception points of the set of multiple transmission reception points, where the oversampling group indices may be relative to an oversampling group index corresponding to a reference transmission reception point of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the oversampling group index for each transmission reception point of the set of multiple transmission reception points may be common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points, the oversampling group index for each transmission reception point of the set of multiple transmission reception points, or both, may be layer-specific for a set of multiple layers associated with the PMI.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator may be defined across all selected Doppler bases associated with the one or more Doppler-domain components.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator may be aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving a non-zero coefficient bitmap, where frequency domain and time domain components associated with the non-zero coefficient bitmap may be reported as a paired coefficient.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the report may include operations, features, means, or instructions for receiving a first stage bitmap having a size that may be based on a quantity of the set of multiple transmission reception points and a quantity of layers associated with the PMI and receiving a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that may be indicated as non-zero by the first stage bitmap.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the one or more reference signals may be configured with a same transmission periodicity and an occasion offset difference between reference signal transmissions may be configured to be less than or equal to a offset threshold duration.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the one or more reference signals may be configured with transmission triggers having a triggering offset difference that may be less than or equal to a trigger threshold duration.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the coherent joint transmission PMI includes a type-II channel state information PMI.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGs. 1 and 2 show examples of wireless communications systems that support Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIG. 3 shows an example of a process flow that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIGs. 4 and 5 show block diagrams of devices that support Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIG. 6 shows a block diagram of a communications manager that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIG. 7 shows a diagram of a system including a device that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIGs. 8 and 9 show block diagrams of devices that support Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIG. 10 shows a block diagram of a communications manager that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIG. 11 shows a diagram of a system including a device that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

FIGs. 12 and 13 show flowcharts illustrating methods that support Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure.

DETAILED DESCRIPTION

A user equipment (UE) may establish communication with multiple transmission reception points (TRPs) , such as a first TRP and a second TRP, in a wireless communications system (e.g., a multi-TRP environment) . The communications between the UE and the TRPs may include reference signaling (e.g., channel state information reference signals (CSI-RSs) ) to support channel state information measurement and reporting. In the case that the communications are associated with multiple-input multiple-output (MIMO) transmission techniques, highly-accurate CSI-RSs may be beneficial for signal precoding and other processes associated with communications between the TRPs and the UE. For example, the UE may measure one or more CSI-RSs transmitted by the TRPs, use this measurement to determine a precoding matrix associated with a codebook, and may transmit an associated precoding matrix indicator (PMI) to the TRPs. However, in some examples, the UE may be moving relative to the TRPs. As such, one or more Doppler shifts may be associated with the communications between the UE and the TRPs, which may impact the accuracy of the CSI-RS measurements and thus prevent the UE from transmitting an accurate PMI. While various techniques have been employed to attempt to account for Doppler shift in communications between a moving UE and a single TRP, these techniques may not be suitable in the case where a UE is communicating with and moving relative to multiple TRPs.

To account for Doppler shift in communications between the UE and the multiple TRPs, the UE may determine a Doppler shift (or some other Doppler-domain components) associated with each of the TRPs, may utilize this determined Doppler shift to generate one or more Doppler-based PMIs, and may transmit these PMIs to one or more of the TRPs to increase future transmission effectiveness and efficiency. For example, a UE may receive one or more reference signals (e.g., CSI-RSs) from a first TRP and from a second TRP. Based on the received reference signals, the UE may estimate aspects of a channel associated with Doppler shift (e.g., Doppler spread or other Doppler-domain components) between the UE and each of the TRPs. For example, the UE may estimate a first Doppler shift associated with the first TRP based on a reference signal from the first TRP and may estimate a second Doppler shift associated with the second TRP based on a reference signal from the second TRP. The UE may utilize these estimated Doppler shifts to determine a Doppler-based PMI, and may transmit the PMI to one or more of the TRPs (or another network entity) . In some examples, the UE may transmit a common Doppler basis selection for all of the TRPs while, in other examples, the UE may transmit TRP-specific Doppler basis selection for each TRP. Additionally, or alternatively, the UE may also transmit TRP-specific information (e.g., Doppler offsets, group indices) associated with the determined PMIs.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to Doppler basis selection for multiple transmission reception points.

FIG. 1 shows an example of a wireless communications system 100 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The wireless communications 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 communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via one or more communication links 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices, such as other UEs 115 or network entities 105, as shown in FIG. 1.

As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.

In some examples, network entities 105 may communicate with the core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via a backhaul communication link 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via a core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) , one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.

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

In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among 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, a network entity 105 may include one or more of 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 (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) 180 system, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .

The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or more RUs 170) . In some cases, a functional split between a CU 160 and a DU 165, or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to one or more DUs 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to one or more RUs 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 105 that are in communication via such communication links.

In wireless communications systems (e.g., wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as a donor entity or an IAB donor. One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140) . The one or more donor network entities 105 (e.g., IAB donors) may be in communication with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120) . IAB nodes 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by DUs 165 of a coupled IAB donor. An IAB-MT may include an independent set of antennas for relay of communications with UEs 115, or may share the same antennas (e.g., of an RU 170) of an IAB node 104 used for access via the DU 165 of the IAB node 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB nodes 104 may include DUs 165 that support communication links with additional entities (e.g., IAB nodes 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of IAB nodes 104) may be configured to operate according to the techniques described herein.

In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support per-TRP oversampled Doppler basis selection as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., IAB nodes 104, DUs 165, CUs 160, RUs 170, RIC 175, SMO 180) .

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the network entities 105 may wirelessly communicate with one another via one or more communication links 125 (e.g., an access link) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated 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 that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities 105) .

In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) ) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .

The communication links 125 shown in the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .

A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.

The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T_s=1/ (Δf_max·N_f) seconds, for which Δf_max may represent a supported subcarrier spacing, and N_f may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N_f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .

Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area 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, the overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base stations 140) may have similar frame timings, and transmissions from different network entities 105 may be approximately aligned in time. For asynchronous operation, network entities 105 may have different frame timings, and transmissions from different network entities 105 may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may be configured to support communicating directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.

In some systems, a D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) . In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., network entities 105, base stations 140, RUs 170) using vehicle-to-network (V2N) communications, or with both.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.

The network entities 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , for which multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , for which multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.

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

In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI- RS) ) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a PMI or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .

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

The UE 115 may establish communication with multiple TRPs 170, such as a first TRP and a second TRP, in a wireless communications system (e.g., a multi-TRP environment) . The communications between the UE 115 and the TRPs 170 may include reference signaling (e.g., CSI-RSs) , which may be used to support channel state information measurements and reporting. In the case that the communications are associated with MIMO transmission techniques, highly-accurate CSI-RSs may be beneficial for signal precoding and other processes associated with communications between the TRPs 170 and the UE 115. For example, the UE 115 may measure one or more CSI-RSs transmitted by the TRPs 170, use this measurement to determine a precoding matrix associated with a codebook, and may transmit an associated PMI (e.g., via a CSI report or similar signaling) to the TRPs 170. In some examples, the UE 115 may be moving relative to the TRPs 170. As such, one or more Doppler shifts may be associated with the communications between the UE 115 and the TRPs 170, which may impact the accuracy of the CSI-RS measurements and thus prevent the UE 115 from determining and reporting an accurate PMI. While various techniques have been employed to account for Doppler shift in communications between a moving UE and a single TRP, these techniques may not be suitable in the case where a UE is communicating with and moving relative to multiple TRPs. Furthermore, existing techniques may not account for variations in hardware at the TRPs (e.g., oscillator drift variations) , and these hardware variations may cause a relative frequency drift between the TRPs.

To account for Doppler shift (and/or hardware variations between TRPs) in communications between the UE 115 and the multiple TRPs 170, the UE 115 may determine a Doppler-based components associated with each of the TRPs 170 (e.g., Doppler basis selection, Doppler offsets, etc. ) , may utilize these determined Doppler-based components to generate one or more Doppler-based, multi-TRP PMIs, and may transmit these PMIs to one or more of the TRPs 170 (e.g., via uplink reporting, such as CSI reporting) . For example, the UE 115 may receive and measure one or more reference signals (e.g., CSI-RSs) from a first TRP and from a second TRP (e.g., of the TRPs 170) . Based on the received reference signals, the UE 115 may estimate aspects of a channel between the UE 115 and each of the TRPs 170, including Doppler-based components of the channel and relative Doppler differences between the TRPs 170. The UE 115 may utilize these estimated Doppler-based components to determine a Doppler-based PMI that takes into account Doppler-components of the channel for each TRP 170. The UE 115 may report (e.g., via a CSI report) TRP-specific Doppler-domain bases to a network entity (e.g., one or more of the TRPs 170) . In some examples, the UE 115 may report a common Doppler basis selection for all TRPs 170. Additionally or alternatively, the UE 115 may report TRP-specific Doppler basis selection for each TRP 170. In addition to the Doppler basis selection, the UE 115 may report one or more Doppler offsets (which may be oversampled or non-oversamples Doppler offsets) .

FIG. 2 shows an example of a wireless communication system 200 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The wireless communication system 200 may implement or may be implemented by aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a UE 115-a, a TRP 170-a, and a TRP 170-b, which may be examples of corresponding devices as described with reference to FIG. 1.

The wireless communication system 200 may be associated with Doppler-based effects such as Doppler shifts, Doppler spreads, and the like. For example, the UE 115-a may communicate with both the TRP 170-a and the TRP 170-b (and/or additional TRPs not shown) while moving at a velocity with respect to the TRPs 170, which may result in Doppler effects on communications between the UE 115-a and the TRPs 170. In some examples (e.g., when the UE 115-a moves at a velocity relative to the TRP 170-a that is different from the velocity relative to the TRP 170-b) , the Doppler effects on the communications between the UE 115-a and the TRP 170-a may not be the same as the Doppler effects on the communications between the UE 115-a and the TRP 170-b. In some examples, the Doppler effects on the communications may result in degraded, inaccurate, or inefficient communications between the UE 115-a and the TRPs 170.

Some techniques used to account for Doppler effects in communications between a single TRP 170 and a UE 115 may include the use of a Doppler-informed precoder matrix. For example, to account for Doppler effects in communications between a single TRP 170 and a UE 115, the UE 115 may provide feedback for beam selection in the form of a PMI or codebook-based feedback (e.g., a Doppler codebook for a single TRP) . For example, the UE 115 may measure CSI-RSs (or other reference signaling) over a period of time, and may use these measurements to prepare a precoder matrix that takes into account selected spatial domain (SD) bases, selected frequency domain (FD) bases, and a coefficient matrix. To account for the velocity of the UE 115, the UE may use the measured CSI-RS information over a period of time to predict (e.g., extrapolate) future precoders. The UE 115 may compress the extrapolated coefficient matrix into a Doppler domain (e.g., localized in time and frequency) , while one or more of the remaining matrices may be assumed constant over time. As such, the UE 115 may report a PMI that takes into account the Doppler effects of the channel for a single TRP 170. While these techniques may be beneficial in accounting for the Doppler effect in communications between a single TRP and a moving UE, they may not be suitable in the case of multiple TRPs.

Some other codebook techniques may be used in the case of a static (e.g., a velocity below some configured threshold) UE 115 to communicate with multiple TRPs. For example, the UE 115 may measure CSI-RSs (or other reference signaling) and utilize these measurements to generate one or more joint codebooks that account for the channel measurements associated with multiple TRPs. However, such joint codebooks may not be suitable for the case where the UE 115 is moving (e.g., above some configured velocity threshold) relative to the TRPs 170, as these techniques may not account for Doppler effects on the communications between the multiple TRPs 170 and the UE 115.

Doppler effects associated with the wireless communication system 200 may result from one or more sources. For example, the Doppler effects may be associated with the movement of the UE 115-a relative to the TRP 170-a and the TRP 170-b. The UE 115-a may be associated with a first velocity along a dominant propagation path of the TRP 170-a (e.g., a dominant transmission path between the UE 115-a and the TRP 170-a) , and the UE 115-a may be associated with a second velocity along a dominant propagation path of the TRP 170-b. These two velocities of the UE 115-a (e.g., relative to the TRPs 170) may result in a separate Doppler shift for each of the TRPs 170 (e.g., a per-TRP Doppler difference, a relative Doppler difference) . Additionally, or alternatively, the Doppler shift may be associated with a frequency drift of one or both of the TRPs 170 associated with or resulting from an oscillator (referred to herein as “XO” ) in one or both of the TRPs 170. As such, the TRP 170-a may be associated with a first frequency drift relative to the UE 115-a, and the TRP 170-b may be associated with a second frequency drift relative to the UE 115-a. These two frequency drifts of the TRPs 170 may contribute to the separate Doppler shifts for the TRPs 170 relative to the UE 115-a. Thus, it may be beneficial (e.g., to increase accuracy of channel state information compression in the time domain) to enable the TRPs 170 and the UE 115-a to account for Doppler shift (e.g., over time) associated with or resulting from the UE 115-a moving relative to more than one of the TRPs 170.

To accurately account for Doppler effects in communications, the wireless communication system 200 may account for the velocities of the UE 115-a relative to each of the TRPs 170 and the XO drift of the TRP 170-a and the TRP 170-b. For example, the XO drift of the TRP 170-a, the XO drift of the TRP 170-b, and the velocities of the UE 115-a relative to the TRPs 170 may result in a linear phase-ramp Doppler shift over time, where the XO drifts of the TRPs 170 may be exemplified by exponential functions and the velocities of the UE 115-a may be exemplified as functions of velocities along the propagation paths between the UE 115-a and the TRP 170-a and between the UE 115-a and the TRP 170-b. The wireless communication system 200 may also take the frequency domain, time domain, transmitted data, and attenuation coefficients associated with the paths between the UE 115-a and the TRPs 170 into account (e.g., along with the XO drifts and the UE 115-a relative velocities) . In some examples, differences in XO drift of each of the TRPs 170 may result in a first Doppler shift associated with the propagation path between the UE 115-a and the TRP 170-a, and a second Doppler shift associated with the propagation path between the UE 115-a and the TRP 170-b (e.g., TRP-specific Doppler shift) . In other examples, the Doppler shift associated with the propagation path between the UE 115-a and the TRP 170-a, and the Doppler shift associated with the propagation path between the UE 115-a and the TRP 170-b may be the same.

In accordance with aspects of the present disclosure, the UE 115-a may report channel state information (e.g., eType II CJT CSI) , including TRP-specific Doppler-domain (e.g., also referred to as time-domain) bases to a network entity of the wireless communications system 200. For example, the UE 115-a may report a common Doppler basis selection 205 for all the TRPs 170. The UE 115-a may report the common Doppler basis selection 205 via a set of bits according to the following equation:

where N₄ represents the Doppler basis length, and Q represents the selected number of bases from a total of N₄ bases. In some examples, basis #0 may be always selected) .

The UE 115-a may also report one or more Doppler offsets (e.g., as part of a CSI report or separately) . In some cases, the UE 115-a may report a TRP-specific non-oversampled Doppler offset ψ_n (e.g., a TRP-specific non-oversampled Doppler offset 220, a TRP-specific non-oversampled Doppler offset 225) . As referred to herein, a non-oversampled Doppler offset for a particular TRP n may be represented as ψ_n∈ {0, 1, ..., N₄-1} (e.g., as an integer) , where N₄ is the Doppler basis length. The UE 115-a may report the non-oversampled Doppler offset 220, 225 viabits.

In some cases, the UE 115-a may report a TRP-specific oversampled Doppler offset ψ_n (e.g., a TRP-specific oversampled Doppler offset 230, a TRP-specific oversampled Doppler offset 235) . As referred to herein, an oversampled Doppler offset for a particular TRP n may be represented as(e.g., fractional) , where O₄ represents a Doppler-domain oversampling factor (e.g., O₄=4) . The UE 115-a may report the oversampled Doppler offset 230, 235 via bits.

In either case of reporting a TRP-specific non-oversampled Doppler offset or reporting a TRP-specific oversampled Doppler offset, the UE 115-a may report fewer Doppler offsets than there are TRPs 170. For example, the UE 115-a may report N-1 Doppler offsets in total, where N represents the total number of the TRPs 170 associated with the report. In such cases, one of the TRPs 170 may be considered a reference TRP 170 (e.g., a numerically first TRP by default or some other configured default) , and the Doppler offset for the reference TRP may be assumed as a zero offset, and the other Doppler offsets may be reported and/or interpreted as being relative to the reference TRP.

In some examples, the UE 115-a may report a TRP-specific Doppler basis selection (e.g., a TRP-specific Doppler basis selection 210, a TRP-specific Doppler basis selection 215) . In such examples, the TRP-specific Doppler basis selection is a fully independent selection for each TRP 170. Similar to the common Doppler basis selection example, when reporting a TRP-specific Doppler basis selection, the UE 115 may also report either a TRP-specific non-oversampled Doppler offset or a TRP- specific oversampled Doppler offset. In such cases, the reported Doppler offset may be interpreted as an offset between each TRP’s local strongest Doppler basis.

In addition to reporting the TRP-specific Doppler basis selection, the UE 115-a may also report a TRP-specific Doppler oversampling group index g_4, _n (e.g., a TRP-specific Doppler oversampling group index 240, a TRP-specific Doppler oversampling group index 245) . For a particular TRP n, the TRP-specific Doppler oversampling group index g_4, _n may be represented as g_4, _n∈ {0, 1, ..., O₄-1} and may be reported via bits. The UE 115-a may report fewer Doppler oversampling group indices than there are TRPs. For example, the UE 115-a may report N-1 Doppler oversampling group indices in total, where N is the total number of the TRPs 170 associated with the report. In such cases, one of the TRPs 170 may be considered a reference TRP, and the TRP-specific oversampling group index for the reference TRP may be assumed as g₄=0.

In some examples, the TRP-specific Doppler offsets for each TRP 170, the TRP-specific oversampling group indices for each TRP 170, or both, may be reported as polarization-common. For example, a TRP-specific Doppler offset reported for each TRP 170 (e.g., the non-oversampled Doppler offset 220, the non-oversampled Doppler offset 225, the oversampled Doppler offset 230, the oversampled Doppler offset 235) or a TRP-specific oversampling group index reported for each TRP (e.g., TRP-specific Doppler oversampling group index 240, TRP-specific Doppler oversampling group index 245) may be common for both polarizations of one or more transmit antennas of each of the TRPs 170.

In some examples, the TRP-specific Doppler offsets that are reported with a common Doppler basis selection may be layer-common or layer-specific. In the case that the UE 115-a may be a MIMO device, the UE 115-a may transmit communications via more than one layer. In some examples, the TRP-specific Doppler offset (e.g., the non-oversampled Doppler offset 220, the non-oversampled Doppler offset 225, the oversampled Doppler offset 230, the oversampled Doppler offset 235) may be common for all layers associated with the PMI transmitted by the UE 115-a. In the case that the Doppler offsets are layer-common, the UE 115-a may implement a TRP-specific time domain phase rotation on measured channel matrices associated with each of the TRPs 170 prior to implementing one or more matrix decomposition techniques (e.g., singular value decomposition (SVD) , eigenvalue decomposition (EVD) ) .

In some examples, one or more TRP-specific Doppler offsets (e.g., the non-oversampled Doppler offset 220, the non-oversampled Doppler offset 225, the oversampled Doppler offset 230, the oversampled Doppler offset 235) may be specific to each layer associated with the PMI transmitted by the UE 115-a. In the case that the Doppler offsets are layer-specific, the UE 115-a may implement a TRP-specific time domain phase rotation on precoders associated with each of the TRPs 170 after implementing one or more matrix decomposition techniques (e.g., SVD, EVD) .

In some examples, when reporting a TRP-specific Doppler basis selection, the UE 115-a may perform the Doppler basis selection after implementing one or more matrix decomposition techniques (e.g., SVD, EVD) .

In some examples, when reporting a TRP-specific Doppler basis selection, the TRP-specific Doppler oversampling group indices may be layer-specific. For example, the TRP-specific Doppler oversampling group index (e.g., the TRP-specific Doppler oversampling group index 240, the TRP-specific Doppler oversampling group index 245) selected by the UE 115-a may be specific to separate layers associated with the PMI transmitted by the UE 115-a. In the case that the TRP-specific Doppler oversampling group indices are layer-specific, the UE 115-a may select the TRP-specific Doppler oversampling group index values after implementing one or more matrix decomposition techniques (e.g., SVD, EVD) . In some examples, the UE 115-a may utilize a same TRP of the TRPs 170 as a reference TRP associated with the TRP-specific Doppler oversampling group index g₄=0 for all layers, however the UE 115-a may not report this reference TRP.

In some examples, the UE 115-a may also report a strongest coefficient indicator (SCI) associated with the determined Doppler components. For example, the UE 115-a may (e.g., for each layer) define the SCI across all selected Doppler bases (e.g., TRP-specific bases, common Doppler bases) , and may report the SCI according to the following payload:

where L_n represents the quantity of beams (e.g., SD bases) selected for each TRP n and where Q represents the quantity of selected Doppler bases. In some other examples, the UE 115-a may align the SCI according to a reference Doppler basis (e.g., Doppler basis 0) , and may report the SCI according to the following payload:

The UE 115-a may take various actions to reduce the size of the non-zero coefficient (NZC) bitmap associated with the CSI reporting to decrease overhead and increase efficiency and throughput of the wireless communication system 200. In some examples, the UE 115-b may reduce a dimension (e.g., the spatial dimension, the frequency dimension, the time or Doppler dimension) associated with the NZC bitmap. For example, for each layer a FD&TD pairing (e.g., delay-Doppler pairing) bitmap is reported based on which NZC bitmap is obtained additionally with path-selection bitmap in SD. In some cases, the FD&TD pairing (e.g., delay-Doppler pairing) bitmap is TRP-common, which results in a bitmap size according to M*Q, where Q is the selected number of Doppler bases and where M is the selected number of FD bases. The baseline 3D bitmap may be sized according to (where L_n represents the quantity of beams (e.g., SD bases) selected for each TRP-n) . However, a reduced NZC bitmap size based on a FD&TD pairing (e.g., delay-Doppler pairing) may be sized according to (where γ<1 may represent a percentage of non-zero FD&TD pairing (e.g., delay-Doppler pairing) , which may be configured by control signaling such as RRC) . Thus, the UE 115-a may reduce the size of the NZC bitmap by maintaining (e.g., such that ) .

In some other cases, a FD&TD pairing (e.g., delay-Doppler pairing) bitmap may be used and may be reported as TRP-specific. A FD&TD pairing (e.g., delay-Doppler pairing) bitmap may be sized according to bits, where N represents the number of TRPs, NMQ represents the size of the FD&TD pairing (e.g., delay-Doppler pairing) bitmap and where represents the size of the path-selection bitmap in SD.

Additionally, or alternatively, the UE 115-a may implement a TRP-/layer-dimension reduction by reporting a subset of the NZC bitmap based on transmitting a first-stage bitmap. For example, the UE 115-a may report a first-stage bitmap representing a block wise coefficient bitmap having a size based on N*rank, where layers of TRPs that have relatively small coefficients (e.g., close to 0 by some threshold amount) are reported as 0 value and layers having larger coefficients are reported as 1 values. In such a scheme, the subsequently transmitted NZC bitmap is reported only for layers/TRPs where a “1” was reported in the first-stage bitmap, thereby reducing the overhead associated with transmitting NZC bitmap values for layers/TRPs where a “0” was reported in the first-stage bitmap. In some examples, the described NZC bitmap size reduction techniques described herein may be combined, such as implementing the two-stage bitmap schemed for TRP/layer reduction along with a FD&TD pairing (e.g., delay-Doppler pairing) bitmap.

The reference signaling (e.g., CSI-RS) being transmitted by the TRPs 170 may be configured in a coordinated way so that the UE 115-a is measuring CSI-RS that are transmitted at the same time or near in time to each other. For example, periodic CSI-RSs (P-CSI-RS) and semi-persistent CSI-RSs (SP-CSI-RS) associated with the UE 115-a and the TRPs 170 may be configured with a same periodicity. Additionally, or alternatively, the P-CSI-RSs and the SP-CSI-RSs may be associated with occasion offsets having a difference no larger than a threshold duration (e.g., 2 consecutive slots) . In some examples, aperiodic CSI-RS (AP-CSI-RSs) bursts associated with the UE 115-a and the TRPs 170 may be configured with triggering offsets characterized by differences no larger than a threshold duration (e.g., 2 consecutive slots) .

FIG. 3 shows an example of a process flow 300 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The process flow 300 may include a UE 115-b, a TRP 170-c, and a TRP 170-d, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2. Although only two TRPs 170 are shown, it is to be understood that the techniques described herein may apply to additional TRPs 170. Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some examples, steps may include additional features not mentioned below, or further steps may be added.

At 305, the UE 115-b may receive one or more reference signals transmitted by the TRP 170-d and/or one or more reference signals transmitted by the TRP 170-c. The reference signals may be examples of CSI-RSs. The reference signals may be configured as periodic CSI-RSs (P-CSI-RSs) or semi-persistent CSI-RSs (SP-CSI-RSs) , and may be associated with a same periodicity, and may be configured with an occasion offset difference (e.g., between transmission of each of the reference signals) that is less than or equal to a threshold duration of time. In some examples, one or more of the reference signals may be configured as aperiodic CSI-RSs (AP-CSI-RSs) , and may include transmission triggers associated with a triggering offset difference that is less than or equal to a trigger threshold.

At 310, the UE 115-b may generate one or more coherent joint transmission PMIs associated with the TRP 170-c and the TRP 170-d. For example, based on receiving the one or more reference signals from the TRP 170-c and the TRP 170-d, the UE 115-b may generate one or more PMIs which may include one or more Doppler-domain (e.g., Doppler-based) components for both the TRP 170-c and the TRP 170-d. In some examples, the UE 115-b may report a common Doppler basis selection associated with both of the TRPs 170 (or all of the TRPs if more than two are included) while, in some other examples, the UE 115-b may report a TRP-specific (e.g., an independent Doppler basis selection) for each of TRP 170-c and TRP 170-d, as further described with reference to FIG. 2. In some examples, the one or more PMIs may include a type-II CSI PMI.

At 315, the UE 115-b may transmit the one or more PMIs to the network (e.g., one or more network entities such as one or both of the TRP 170-c and the TRP 170-d) . For example, the UE 115-b may transmit a report including the generated PMI (e.g., the coherent joint transmission PMI) to the TRPs 170. In some examples, the UE 115-b may transmit a report that includes a common Doppler basis selection for the TRPs 170 (e.g., a Doppler basis that is the same for both of the TRPs 170) . In some examples, the report transmitted by the UE 115-b may also include a Doppler offset value for one or more of the TRPs 170. Each Doppler offset value may be an example of an oversampled Doppler offset value or a non-oversampled Doppler offset value, and each Doppler offset value may be associated with a length of the common Doppler basis. For example, an oversampled Doppler offset value may be associated with a multiple value of the length of the common Doppler basis, while a non-oversampled Doppler offset value may be associated with an integer value of the length of the common Doppler basis. The UE 115-b may transmit N-1 Doppler offset values in total, where N is the total quantity of the TRPs 170, where the quantity of transmitted Doppler offset values may represent a relative Doppler offset relative to a reference TRP of the TRPs 170. Each transmitted Doppler offset may also be common to both polarizations of the transmit antennas of the associated TRPs 170. Each transmitted Doppler offset may additionally be common to all layers associated with transmission of the PMI, or specific to each layer of the layers associated with the transmission of the PMI.

In some examples, the UE 115-b may transmit a report to the TRPs 170 that includes an independent Doppler basis selection (e.g., a TRP-specific Doppler basis selection) for each of the TRPs 170. In some examples, the report transmitted by the UE 115-b may also include an oversampled group index for each of the TRPs 170. The UE 115-b may transmit N-1 oversampled group indices in total, where N is the total quantity of the TRPs 170, where the transmitted oversampled group indices may be relative to a reference oversampled group index associated with one of the TRPs 170. Each transmitted oversampled group index may also be common to both polarizations of the transmit antennas of the associated TRPs 170. Each transmitted TRP-specific Doppler basis selection and each oversampled group index may each be specific to each layer of the layers associated with the transmission of the PMI.

In some examples, the report transmitted by the UE 115-b to the TRPs 170 may include an SCI. The SCI may indicate (e.g., to the TRPs 170) a strongest coefficient that may correspond to a coefficient matrix associated with the transmitted PMI. In some examples, the SCI may be defined across each of the selected Doppler bases (e.g., a common Doppler basis, one or more TRP-specific Doppler bases) associated with the one or more Doppler offset values or the oversampled group indices. In some examples, the SCI may be aligned with a reference (e.g., zero) Doppler basis associated with the one or more Doppler offset values or the oversampled group indices.

In some examples, the report transmitted by the UE 115-b may also include one or more bitmaps. For example, the report transmitted by the UE 115-b to the TRPs 170 may include a non-zero coefficient bitmap. The non-zero coefficient bitmap may be associated with frequency-domain and time-domain components that may be reported by the UE 115-b as a delay-Doppler pair. In some examples, transmitting the report may include the UE 115-b transmitting a first stage bitmap that may be characterized by a size that is based on a quantity of the TRPs 170 and a quantity of layers associated with the PMI. The UE 115-b may also transmit a second stage bitmap that may be characterized by one or more non-zero coefficients associated with an indicated, non-zero subset of components of the first stage bitmap.

At 320, one or both of the TRPs 170 may schedule one or more resources for communication with the UE 115-b. For example, in response to receiving the one or more PMIs transmitted from the UE 115-b, the TRPs 170 may schedule various PDSCH resources based on the received PMI. At 325 the TRPs 170 may transmit, and the UE 115-b may receive, the PDSCH resources.

FIG. 4 shows a block diagram 400 of a device 405 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 405 may be an example of aspects of a UE 115 as described herein. The device 405 may include a receiver 410, a transmitter 415, and a communications manager 420. The device 405, or one or more components of the device 405 (e.g., the receiver 410, the transmitter 415, and the communications manager 420) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 410 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to Doppler basis selection for multiple transmission reception points) . Information may be passed on to other components of the device 405. The receiver 410 may utilize a single antenna or a set of multiple antennas.

The transmitter 415 may provide a means for transmitting signals generated by other components of the device 405. For example, the 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 Doppler basis selection for multiple transmission reception points) . In some examples, the transmitter 415 may be co-located with a receiver 410 in a transceiver module. The transmitter 415 may utilize a single antenna or a set of multiple antennas.

The communications manager 420, the receiver 410, the transmitter 415, or various combinations thereof or various components thereof may be examples of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

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

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

In some examples, the communications manager 420 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 410, the transmitter 415, or both. For example, the communications manager 420 may receive information from the receiver 410, send information to the transmitter 415, or be integrated in combination with the receiver 410, the transmitter 415, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 420 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 420 is capable of, configured to, or operable to support a means for receiving one or more reference signals from a set of multiple transmission reception points. The communications manager 420 is capable of, configured to, or operable to support a means for generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points. The communications manager 420 is capable of, configured to, or operable to support a means for transmitting a report including an indication of the coherent joint transmission PMI.

By including or configuring the communications manager 420 in accordance with examples as described herein, the device 405 (e.g., at least one processor controlling or otherwise coupled with the receiver 410, the transmitter 415, the communications manager 420, or a combination thereof) may support techniques for reduced processing and more efficient utilization of communication resources.

FIG. 5 shows a block diagram 500 of a device 505 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 505 may be an example of aspects of a device 405 or a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. The device 505, or one or more components of the device 505 (e.g., the receiver 510, the transmitter 515, and the communications manager 520) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 510 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to Doppler basis selection for multiple transmission reception points) . Information may be passed on to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.

The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the 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 Doppler basis selection for multiple transmission reception points) . In some examples, the transmitter 515 may be co-located with a receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.

The device 505, or various components thereof, may be an example of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 520 may include a reference signaling manager 525, a PMI manager 530, a report manager 535, or any combination thereof. The communications manager 520 may be an example of aspects of a communications manager 420 as described herein. In some examples, the communications manager 520, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 520 may support wireless communications in accordance with examples as disclosed herein. The reference signaling manager 525 is capable of, configured to, or operable to support a means for receiving one or more reference signals from a set of multiple transmission reception points. The PMI manager 530 is capable of, configured to, or operable to support a means for generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points. The report manager 535 is capable of, configured to, or operable to support a means for transmitting a report including an indication of the coherent joint transmission PMI.

FIG. 6 shows a block diagram 600 of a communications manager 620 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The communications manager 620 may be an example of aspects of a communications manager 420, a communications manager 520, or both, as described herein. The communications manager 620, or various components thereof, may be an example of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 620 may include a reference signaling manager 625, a PMI manager 630, a report manager 635, a common Doppler basis selection manager 640, an independent Doppler basis selection manager 645, a strongest coefficient indicator manager 650, a bitmap manager 655, a Doppler offset value manager 660, an oversampling group index manager 665, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. The reference signaling manager 625 is capable of, configured to, or operable to support a means for receiving one or more reference signals from a set of multiple transmission reception points. The PMI manager 630 is capable of, configured to, or operable to support a means for generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points. The report manager 635 is capable of, configured to, or operable to support a means for transmitting a report including an indication of the coherent joint transmission PMI.

In some examples, to support transmitting the report, the common Doppler basis selection manager 640 is capable of, configured to, or operable to support a means for transmitting a common Doppler basis selection for all transmission reception points of the set of multiple transmission reception points.

In some examples, to support transmitting the report, the Doppler offset value manager 660 is capable of, configured to, or operable to support a means for transmitting a Doppler offset value for each transmission reception point of the set of multiple transmission reception points.

In some examples, the Doppler offset value includes a non-oversampled Doppler offset value. In some examples, a sample quantity for the non-oversampled Doppler offset value is an integer value corresponding to a Doppler basis length.

In some examples, the Doppler offset value includes a oversampled Doppler offset value. In some examples, a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.

In some examples, a quantity of values of the Doppler offset value for each transmission reception point of the set of multiple transmission reception points is less than a total quantity of transmission reception points of the set of multiple transmission reception points. In some examples, the quantity of values of the Doppler offset value represents a relative offset with respect to a reference transmission reception point of the set of multiple transmission reception points.

In some examples, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points are common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points are common for all layers of a set of multiple layers associated with the PMI.

In some examples, the Doppler offset value for each transmission reception point of the set of multiple transmission reception points are layer-specific for a set of multiple layers associated with the PMI.

In some examples, to support transmitting the report, the independent Doppler basis selection manager 645 is capable of, configured to, or operable to support a means for transmitting an independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points.

In some examples, to support transmitting the report, the oversampling group index manager 665 is capable of, configured to, or operable to support a means for transmitting an oversampling group index for each transmission reception point of the set of multiple transmission reception points.

In some examples, to support transmitting the report, the oversampling group index manager 665 is capable of, configured to, or operable to support a means for transmitting a quantity of oversampling group indices that is less than a total quantity of transmission reception points of the set of multiple transmission reception points, where the oversampling group indices are relative to an oversampling group index corresponding to a reference transmission reception point of the set of multiple transmission reception points.

In some examples, the oversampling group index for each transmission reception point of the set of multiple transmission reception points is common for both polarizations of one or more transmit antennas of the set of multiple transmission reception points.

In some examples, the independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points, the oversampling group index for each transmission reception point of the set of multiple transmission reception points, or both, are layer-specific for a set of multiple layers associated with the PMI.

In some examples, to support transmitting the report, the strongest coefficient indicator manager 650 is capable of, configured to, or operable to support a means for transmitting, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator is defined across all selected Doppler bases associated with the one or more Doppler-domain components.

In some examples, to support transmitting the report, the strongest coefficient indicator manager 650 is capable of, configured to, or operable to support a means for transmitting, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator is aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

In some examples, to support transmitting the report, the bitmap manager 655 is capable of, configured to, or operable to support a means for transmitting a non-zero coefficient bitmap, where frequency domain and time domain components associated with the non-zero coefficient bitmap are reported as a paired coefficient.

In some examples, to support transmitting the report, the bitmap manager 655 is capable of, configured to, or operable to support a means for transmitting a first stage bitmap having a size that is based on a quantity of the set of multiple transmission reception points and a quantity of layers associated with the PMI. In some examples, to support transmitting the report, the bitmap manager 655 is capable of, configured to, or operable to support a means for transmitting a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that is indicated as non-zero by the first stage bitmap.

In some examples, the one or more reference signals received from the set of multiple transmission reception points are configured with a same transmission periodicity. In some examples, an occasion offset difference between reference signal transmissions is configured to be less than or equal to an offset threshold duration.

In some examples, the one or more reference signals received from the set of multiple transmission reception points are configured with transmission triggers having a triggering offset difference that is less than or equal to a trigger threshold duration.

In some examples, the coherent joint transmission PMI includes a type-II channel state information PMI.

FIG. 7 shows a diagram of a system 700 including a device 705 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 705 may be an example of or include the components of a device 405, a device 505, or a UE 115 as described herein. The device 705 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 705 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications 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 be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 745) .

The I/O controller 710 may manage input and output signals for the device 705. The I/O controller 710 may also manage peripherals not integrated into the device 705. In some cases, the I/O controller 710 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 710 may utilize an operating system such as or another known operating system. Additionally or alternatively, the I/O controller 710 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 710 may be implemented as part of one or more processors, such as the 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.

In some cases, the device 705 may include a single antenna 725. However, in some other cases, the device 705 may have more than one antenna 725, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 715 may communicate bi-directionally, via the one or more antennas 725, wired, or wireless links as described herein. For example, the transceiver 715 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 715 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 725 for transmission, and to demodulate packets received from the one or more antennas 725. The transceiver 715, or the transceiver 715 and one or more antennas 725, may be an example of a transmitter 415, a transmitter 515, a receiver 410, a receiver 510, or any combination thereof or component thereof, as described herein.

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

The at least one processor 740 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the at least one processor 740 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 740. The at least one processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 730) to cause the device 705 to perform various functions (e.g., functions or tasks supporting Doppler basis selection for multiple transmission reception points) . For example, the device 705 or a component of the device 705 may include at least one processor 740 and at least one memory 730 coupled with or to the at least one processor 740, the at least one processor 740 and at least one memory 730 configured to perform various functions described herein. In some examples, the at least one processor 740 may include multiple processors and the at least one memory 730 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 740 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 740) and memory circuitry (which may include the at least one memory 730) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 740 or a processing system including the at least one processor 740 may be configured to, configurable to, or operable to cause the device 705 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 730 or otherwise, to perform one or more of the functions described herein.

The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving one or more reference signals from a set of multiple transmission reception points. The communications manager 720 is capable of, configured to, or operable to support a means for generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting a report including an indication of the coherent joint transmission PMI.

By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 may support techniques for improved communication reliability, reduced latency, improved user experience related to reduced processing, more efficient utilization of communication resources, and improved coordination between devices.

In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 715, the one or more antennas 725, or any combination thereof. Although the communications manager 720 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 720 may be supported by or performed by the at least one processor 740, the at least one memory 730, the code 735, or any combination thereof. For example, the code 735 may include instructions executable by the at least one processor 740 to cause the device 705 to perform various aspects of Doppler basis selection for multiple transmission reception points as described herein, or the at least one processor 740 and the at least one memory 730 may be otherwise configured to, individually or collectively, perform or support such operations.

FIG. 8 shows a block diagram 800 of a device 805 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 805 may be an example of aspects of a network entity 105 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, and the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 810 may provide a means for obtaining (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) . Information may be passed on to other components of the device 805. In some examples, the receiver 810 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 810 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

The transmitter 815 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 805. For example, the transmitter 815 may output 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) . In some examples, the transmitter 815 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the 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, the transmitter 815 and the receiver 810 may be co-located in a transceiver, which may include or be coupled with a modem.

The communications manager 820, the receiver 810, the transmitter 815, or various combinations thereof or various components thereof may be examples of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

In some examples, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .

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

In some examples, the communications manager 820 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 is capable of, configured to, or operable to support a means for transmitting one or more reference signals to a UE. The communications manager 820 is capable of, configured to, or operable to support a means for receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points. The communications manager 820 is capable of, configured to, or operable to support a means for scheduling one or more resources for communication with the UE based on receiving the report.

By including or configuring the communications manager 820 in accordance with examples as described herein, the device 805 (e.g., at least one processor controlling or otherwise coupled with the receiver 810, the transmitter 815, the communications manager 820, or a combination thereof) may support techniques for reduced processing and more efficient utilization of communication resources.

FIG. 9 shows a block diagram 900 of a device 905 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 905 may be an example of aspects of a device 805 or a network entity 105 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communications manager 920. The device 905, or one or more components of the device 905 (e.g., the receiver 910, the transmitter 915, and the communications manager 920) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 910 may provide a means for obtaining (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) . Information may be passed on to other components of the device 905. In some examples, the receiver 910 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 910 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

The transmitter 915 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 905. For example, the transmitter 915 may output 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) . In some examples, the transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the 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, the transmitter 915 and the receiver 910 may be co-located in a transceiver, which may include or be coupled with a modem.

The device 905, or various components thereof, may be an example of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 920 may include a reference signaling manager 925, a PMI indicator 930, a downlink resource manager 935, or any combination thereof. The communications manager 920 may be an example of aspects of a communications manager 820 as described herein. In some examples, the communications manager 920, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 910, the transmitter 915, or both. For example, the communications manager 920 may receive information from the receiver 910, send information to the transmitter 915, or be integrated in combination with the receiver 910, the transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The reference signaling manager 925 is capable of, configured to, or operable to support a means for transmitting one or more reference signals to a UE. The PMI indicator 930 is capable of, configured to, or operable to support a means for receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points. The downlink resource manager 935 is capable of, configured to, or operable to support a means for scheduling one or more resources for communication with the UE based on receiving the report.

FIG. 10 shows a block diagram 1000 of a communications manager 1020 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The communications manager 1020 may be an example of aspects of a communications manager 820, a communications manager 920, or both, as described herein. The communications manager 1020, or various components thereof, may be an example of means for performing various aspects of Doppler basis selection for multiple transmission reception points as described herein. For example, the communications manager 1020 may include a reference signaling manager 1025, a PMI indicator 1030, a downlink resource manager 1035, a common Doppler basis selection manager 1040, an independent Doppler basis selection manager 1045, a strongest coefficient indicator manager 1050, a bitmap manager 1055, a Doppler offset value manager 1060, an oversampling group index manager 1065, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) which may include communications within a protocol layer of a protocol stack, communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105) , or any combination thereof.

The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. The reference signaling manager 1025 is capable of, configured to, or operable to support a means for transmitting one or more reference signals to a UE. The PMI indicator 1030 is capable of, configured to, or operable to support a means for receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points. The downlink resource manager 1035 is capable of, configured to, or operable to support a means for scheduling one or more resources for communication with the UE based on receiving the report.

In some examples, to support receiving the report, the common Doppler basis selection manager 1040 is capable of, configured to, or operable to support a means for receiving a common Doppler basis selection for all transmission reception points of the set of multiple transmission reception points.

In some examples, to support receiving the report, the Doppler offset value manager 1060 is capable of, configured to, or operable to support a means for receiving a Doppler offset value for each transmission reception point of the set of multiple transmission reception points.

In some examples, the Doppler offset value includes an oversampled Doppler offset value. In some examples, a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.

In some examples, to support receiving the report, the independent Doppler basis selection manager 1045 is capable of, configured to, or operable to support a means for receiving an independent Doppler basis selection for each transmission reception point of the set of multiple transmission reception points.

In some examples, to support receiving the report, the oversampling group index manager 1065 is capable of, configured to, or operable to support a means for receiving an oversampling group index for each transmission reception point of the set of multiple transmission reception points.

In some examples, to support receiving the report, the oversampling group index manager 1065 is capable of, configured to, or operable to support a means for receiving a quantity of oversampling group indices that is less than a total quantity of transmission reception points of the set of multiple transmission reception points, where the oversampling group indices are relative to an oversampling group index corresponding to a reference transmission reception point of the set of multiple transmission reception points.

In some examples, to support receiving the report, the strongest coefficient indicator manager 1050 is capable of, configured to, or operable to support a means for receiving, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator is defined across all selected Doppler bases associated with the one or more Doppler-domain components.

In some examples, to support receiving the report, the strongest coefficient indicator manager 1050 is capable of, configured to, or operable to support a means for receiving, for each layer of a set of multiple layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, where the strongest coefficient indicator is aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

In some examples, to support receiving the report, the bitmap manager 1055 is capable of, configured to, or operable to support a means for receiving a non-zero coefficient bitmap, where frequency domain and time domain components associated with the non-zero coefficient bitmap are reported as a paired coefficient.

In some examples, to support receiving the report, the bitmap manager 1055 is capable of, configured to, or operable to support a means for receiving a first stage bitmap having a size that is based on a quantity of the set of multiple transmission reception points and a quantity of layers associated with the PMI. In some examples, to support receiving the report, the bitmap manager 1055 is capable of, configured to, or operable to support a means for receiving a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that is indicated as non-zero by the first stage bitmap.

In some examples, the one or more reference signals are configured with a same transmission periodicity. In some examples, an occasion offset difference between reference signal transmissions is configured to be less than or equal to an offset threshold duration.

In some examples, the one or more reference signals are configured with transmission triggers having a triggering offset difference that is less than or equal to a trigger threshold duration.

FIG. 11 shows a diagram of a system 1100 including a device 1105 that supports Doppler basis selection for multiple transmission reception points in accordance with one or more aspects of the present disclosure. The device 1105 may be an example of or include the components of a device 805, a device 905, or a network entity 105 as described herein. The device 1105 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, which may include communications over one or more wired interfaces, over one or more wireless interfaces, or any combination thereof. The device 1105 may include components that support outputting and obtaining communications, such as a communications manager 1120, a transceiver 1110, an antenna 1115, at least one memory 1125, code 1130, and at least one processor 1135. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1140) .

The transceiver 1110 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1110 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1110 may include a wireless transceiver and may communicate bi-directionally with another wireless transceiver. In some examples, the device 1105 may include one or more antennas 1115, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently) . The transceiver 1110 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1115, by a wired transmitter) , to receive modulated signals (e.g., from one or more antennas 1115, from a wired receiver) , and to demodulate signals. In some implementations, the transceiver 1110 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1115 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1115 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1110 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1110, or the transceiver 1110 and the one or more antennas 1115, or the transceiver 1110 and the one or more antennas 1115 and one or more processors or one or more memory components (e.g., the at least one processor 1135, the at least one memory 1125, or both) , may be included in a chip or chip assembly that is installed in the device 1105. In some examples, the transceiver 1110 may be operable to support communications via one or more communications links (e.g., a communication link 125, a backhaul communication link 120, a midhaul communication link 162, a fronthaul communication link 168) .

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

The at least one processor 1135 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, discrete gate or transistor logic, a discrete hardware component, or any combination thereof) . In some cases, the at least one processor 1135 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1135. The at least one processor 1135 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1125) to cause the device 1105 to perform various functions (e.g., functions or tasks supporting Doppler basis selection for multiple transmission reception points) . For example, the device 1105 or a component of the device 1105 may include at least one processor 1135 and at least one memory 1125 coupled with one or more of the at least one processor 1135, the at least one processor 1135 and the at least one memory 1125 configured to perform various functions described herein. The 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 operating systems, virtual machines, or container instances) that may host the functions (e.g., by executing code 1130) to perform the functions of the device 1105. The 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 the device 1105 (such as within one or more of the at least one memory 1125) . In some examples, the at least one processor 1135 may include multiple processors and the at least one memory 1125 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1135 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1135) and memory circuitry (which may include the at least one memory 1125) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 1135 or a processing system including the at least one processor 1135 may be configured to, configurable to, or operable to cause the device 1105 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1125 or otherwise, to perform one or more of the functions described herein.

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

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

The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1120 is capable of, configured to, or operable to support a means for transmitting one or more reference signals to a UE. The communications manager 1120 is capable of, configured to, or operable to support a means for receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points. The communications manager 1120 is capable of, configured to, or operable to support a means for scheduling one or more resources for communication with the UE based on receiving the report.

By including or configuring the communications manager 1120 in accordance with examples as described herein, the device 1105 may support techniques for improved communication reliability, reduced latency, improved user experience related to reduced processing, more efficient utilization of communication resources, and improved coordination between devices.

In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1110, the one or more antennas 1115 (e.g., where applicable) , or any combination thereof. Although the communications manager 1120 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1120 may be supported by or performed by the transceiver 1110, one or more of the at least one processor 1135, one or more of the at least one memory 1125, the code 1130, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1135, the at least one memory 1125, the code 1130, or any combination thereof) . For example, the code 1130 may include instructions executable by one or more of the at least one processor 1135 to cause the device 1105 to perform various aspects of Doppler basis selection for multiple transmission reception points as described herein, or the at least one processor 1135 and the at least one memory 1125 may be otherwise configured to, individually or collectively, perform or support such operations.

FIG. 12 shows a flowchart illustrating a method 1200 that supports Doppler basis selection for multiple transmission reception points in accordance with aspects of the present disclosure. The operations of the method 1200 may be implemented by a UE or its components as described herein. For example, the operations of the method 1200 may be performed by a UE 115 as described with reference to FIGs. 1 through 7. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.

At 1205, the method may include receiving one or more reference signals from a set of multiple transmission reception points. The operations of block 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a reference signaling manager 625 as described with reference to FIG. 6.

At 1210, the method may include generating, based on receiving the one or more reference signals, a coherent joint transmission PMI associated with the set of multiple transmission reception points, where the coherent joint transmission PMI includes one or more Doppler-domain components for each transmission reception point of the set of multiple transmission reception points. The operations of block 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by a PMI manager 630 as described with reference to FIG. 6.

At 1215, the method may include transmitting a report including an indication of the coherent joint transmission PMI. The operations of block 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by a report manager 635 as described with reference to FIG. 6.

FIG. 13 shows a flowchart illustrating a method 1300 that supports Doppler basis selection for multiple transmission reception points in accordance with aspects of the present disclosure. The operations of the method 1300 may be implemented by a network entity or its components as described herein. For example, the operations of the method 1300 may be performed by a network entity as described with reference to FIGs. 1 through 3 and 8 through 11. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.

At 1305, the method may include transmitting one or more reference signals to a UE. The operations of block 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a reference signaling manager 1025 as described with reference to FIG. 10.

At 1310, the method may include receiving a report including an indication of a coherent joint transmission PMI, where the coherent joint transmission PMI is based on the one or more reference signals and includes one or more Doppler-domain components for each transmission reception point of a set of multiple transmission reception points. The operations of block 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a PMI indicator 1030 as described with reference to FIG. 10.

At 1315, the method may include scheduling one or more resources for communication with the UE based on receiving the report. The operations of block 1315 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by a downlink resource manager 1035 as described with reference to FIG. 10.

The following provides an overview of aspects of the present disclosure:

Aspect 1: A method for wireless communications at a UE, comprising: receiving one or more reference signals from a plurality of transmission reception points; generating, based at least in part on receiving the one or more reference signals, a coherent joint transmission precoding matrix indicator (PMI) associated with the plurality of transmission reception points, wherein the coherent joint transmission PMI comprises one or more Doppler-domain components for each transmission reception point of the plurality of transmission reception points; and transmitting a report comprising an indication of the coherent joint transmission PMI.

Aspect 2: The method of aspect 1, wherein transmitting the report comprises: transmitting a common Doppler basis selection for all transmission reception points of the plurality of transmission reception points.

Aspect 3: The method of aspect 2, wherein transmitting the report comprises: transmitting a Doppler offset value for each transmission reception point of the plurality of transmission reception points.

Aspect 4: The method of aspect 3, wherein the Doppler offset value comprises a non-oversampled Doppler offset value, a sample quantity for the non-oversampled Doppler offset value is an integer value corresponding to a Doppler basis length.

Aspect 5: The method of any of aspects 3 through 4, wherein the Doppler offset value comprises a oversampled Doppler offset value, a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.

Aspect 6: The method of any of aspects 3 through 5, wherein a quantity of values of the Doppler offset value for each transmission reception point of the plurality of transmission reception points is less than a total quantity of transmission reception points of the plurality of transmission reception points, the quantity of values of the Doppler offset value represent a relative offset with respect to a reference transmission reception point of the plurality of transmission reception points.

Aspect 7: The method of any of aspects 3 through 6, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.

Aspect 8: The method of any of aspects 3 through 7, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for all layers of a plurality of layers associated with the PMI.

Aspect 9: The method of any of aspects 3 through 8, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are layer-specific for a plurality of layers associated with the PMI.

Aspect 10: The method of any of aspects 1 through 9, wherein transmitting the report comprises: transmitting an independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points.

Aspect 11: The method of aspect 10, wherein transmitting the report comprises: transmitting an oversampling group index for each transmission reception point of the plurality of transmission reception points.

Aspect 12: The method of aspect 11, wherein transmitting the report comprises: transmitting a quantity of oversampling group indices that is less than a total quantity of transmission reception points of the plurality of transmission reception points, wherein the oversampling group indices are relative to an oversampling group index corresponding to a reference transmission reception point of the plurality of transmission reception points.

Aspect 13: The method of any of aspects 11 through 12, wherein the oversampling group index for each transmission reception point of the plurality of transmission reception points is common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.

Aspect 14: The method of any of aspects 11 through 13, wherein the independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points, the oversampling group index for each transmission reception point of the plurality of transmission reception points, or both, are layer-specific for a plurality of layers associated with the PMI.

Aspect 15: The method of any of aspects 1 through 14, wherein transmitting the report comprises: transmitting, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is defined across all selected Doppler bases associated with the one or more Doppler-domain components.

Aspect 16: The method of any of aspects 1 through 15, wherein transmitting the report comprises: transmitting, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

Aspect 17: The method of any of aspects 1 through 16, wherein transmitting the report comprises: transmitting a non-zero coefficient bitmap, wherein frequency domain and time domain components associated with the non-zero coefficient bitmap are reported as a paired coefficient.

Aspect 18: The method of any of aspects 1 through 17, wherein transmitting the report comprises: transmitting a first stage bitmap having a size that is based on a quantity of the plurality of transmission reception points and a quantity of layers associated with the PMI; and transmitting a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that is indicated as non-zero by the first stage bitmap.

Aspect 19: The method of any of aspects 1 through 18, wherein the one or more reference signals received from the plurality of transmission reception points are configured with a same transmission periodicity, and an occasion offset difference between reference signal transmissions is configured to be less than or equal to a offset threshold duration.

Aspect 20: The method of any of aspects 1 through 19, wherein the one or more reference signals received from the plurality of transmission reception points are configured with transmission triggers having a triggering offset difference that is less than or equal to a trigger threshold duration.

Aspect 21: The method of any of aspects 1 through 20, wherein the coherent joint transmission PMI comprises a type-II channel state information PMI.

Aspect 22: A method for wireless communications at a network entity, comprising: transmitting one or more reference signals to a UE; receiving a report comprising an indication of a coherent joint transmission precoding matrix indicator (PMI) , wherein the coherent joint transmission PMI is based at least in part on the one or more reference signals and comprises one or more Doppler-domain components for each transmission reception point of a plurality of transmission reception points; and scheduling one or more resources for communication with the UE based at least in part on receiving the report.

Aspect 23: The method of aspect 22, wherein receiving the report comprises: receiving a common Doppler basis selection for all transmission reception points of the plurality of transmission reception points.

Aspect 24: The method of aspect 23, wherein receiving the report comprises: receiving a Doppler offset value for each transmission reception point of the plurality of transmission reception points.

Aspect 25: The method of aspect 24, wherein the Doppler offset value comprises a non-oversampled Doppler offset value, a sample quantity for the non- oversampled Doppler offset value is an integer value corresponding to a Doppler basis length.

Aspect 26: The method of any of aspects 24 through 25, wherein the Doppler offset value comprises a oversampled Doppler offset value, a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.

Aspect 27: The method of any of aspects 24 through 26, wherein a quantity of values of the Doppler offset value for each transmission reception point of the plurality of transmission reception points is less than a total quantity of transmission reception points of the plurality of transmission reception points, the quantity of values of the Doppler offset value represent a relative offset with respect to a reference transmission reception point of the plurality of transmission reception points.

Aspect 28: The method of any of aspects 24 through 27, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.

Aspect 29: The method of any of aspects 24 through 28, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for all layers of a plurality of layers associated with the PMI.

Aspect 30: The method of any of aspects 24 through 29, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are layer-specific for a plurality of layers associated with the PMI.

Aspect 31: The method of any of aspects 22 through 30, wherein receiving the report comprises: receiving an independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points.

Aspect 32: The method of aspect 31, wherein receiving the report comprises: receiving an oversampling group index for each transmission reception point of the plurality of transmission reception points.

Aspect 33: The method of aspect 32, wherein receiving the report comprises: receiving a quantity of oversampling group indices that is less than a total quantity of transmission reception points of the plurality of transmission reception points, wherein the oversampling group indices are relative to an oversampling group index corresponding to a reference transmission reception point of the plurality of transmission reception points.

Aspect 34: The method of any of aspects 32 through 33, wherein the oversampling group index for each transmission reception point of the plurality of transmission reception points is common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.

Aspect 35: The method of any of aspects 32 through 34, wherein the independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points, the oversampling group index for each transmission reception point of the plurality of transmission reception points, or both, are layer-specific for a plurality of layers associated with the PMI.

Aspect 36: The method of any of aspects 22 through 35, wherein receiving the report comprises: receiving, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is defined across all selected Doppler bases associated with the one or more Doppler-domain components.

Aspect 37: The method of any of aspects 22 through 36, wherein receiving the report comprises: receiving, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is aligned with a zero Doppler basis associated with the one or more Doppler-domain components.

Aspect 38: The method of any of aspects 22 through 37, wherein receiving the report comprises: receiving a non-zero coefficient bitmap, wherein frequency domain and time domain components associated with the non-zero coefficient bitmap are reported as a paired coefficient.

Aspect 39: The method of any of aspects 22 through 38, wherein receiving the report comprises: receiving a first stage bitmap having a size that is based on a quantity of the plurality of transmission reception points and a quantity of layers associated with the PMI; and receiving a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that is indicated as non-zero by the first stage bitmap.

Aspect 40: The method of any of aspects 22 through 39, wherein the one or more reference signals are configured with a same transmission periodicity, and an occasion offset difference between reference signal transmissions is configured to be less than or equal to a offset threshold duration.

Aspect 41: The method of any of aspects 22 through 40, wherein the one or more reference signals are configured with transmission triggers having a triggering offset difference that is less than or equal to a trigger threshold duration.

Aspect 42: The method of any of aspects 22 through 41, wherein the coherent joint transmission PMI comprises a type-II channel state information PMI.

Aspect 43: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 21.

Aspect 44: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 21.

Aspect 45: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of aspects 1 through 21.

Aspect 46: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 22 through 42.

Aspect 47: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 22 through 42.

Aspect 48: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of aspects 22 through 42.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.

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

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “acomponent” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”

The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A user equipment (UE) , comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:

receive one or more reference signals from a plurality of transmission reception points;

generate, based at least in part on receiving the one or more reference signals, a coherent joint transmission precoding matrix indicator (PMI) associated with the plurality of transmission reception points, wherein the coherent joint transmission PMI comprises one or more Doppler-domain components for each transmission reception point of the plurality of transmission reception points; and

transmit a report comprising an indication of the coherent joint transmission PMI.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a common Doppler basis selection for all transmission reception points of the plurality of transmission reception points.
The UE of claim 2, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a Doppler offset value for each transmission reception point of the plurality of transmission reception points.
The UE of claim 3, wherein:

the Doppler offset value comprises a non-oversampled Doppler offset value, and

a sample quantity for the non-oversampled Doppler offset value is an integer value corresponding to a Doppler basis length.
The UE of claim 3, wherein:

the Doppler offset value comprises an oversampled Doppler offset value, and

a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.
The UE of claim 3, wherein:

a quantity of values of the Doppler offset value for each transmission reception point of the plurality of transmission reception points is less than a total quantity of transmission reception points of the plurality of transmission reception points, and

the quantity of values of the Doppler offset value represent a relative offset with respect to a reference transmission reception point of the plurality of transmission reception points.
The UE of claim 3, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.
The UE of claim 3, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are common for all layers of a plurality of layers associated with the PMI.
The UE of claim 3, wherein the Doppler offset value for each transmission reception point of the plurality of transmission reception points are layer-specific for a plurality of layers associated with the PMI.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit an independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points.
The UE of claim 10, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit an oversampling group index for each transmission reception point of the plurality of transmission reception points.
The UE of claim 11, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a quantity of oversampling group indices that is less than a total quantity of transmission reception points of the plurality of transmission reception points, wherein the oversampling group indices are relative to an oversampling group index corresponding to a reference transmission reception point of the plurality of transmission reception points.
The UE of claim 11, wherein the oversampling group index for each transmission reception point of the plurality of transmission reception points is common for both polarizations of one or more transmit antennas of the plurality of transmission reception points.
The UE of claim 11, wherein the independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points, the oversampling group index for each transmission reception point of the plurality of transmission reception points, or both, are layer-specific for a plurality of layers associated with the PMI.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is defined across all selected Doppler bases associated with the one or more Doppler-domain components.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit, for each layer of a plurality of layers associated with the PMI, a strongest coefficient indicator that indicates a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is aligned with a zero Doppler basis associated with the one or more Doppler-domain components.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a non-zero coefficient bitmap, wherein frequency domain and time domain components associated with the non-zero coefficient bitmap are reported as a paired coefficient.
The UE of claim 1, wherein, to transmit the report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a first stage bitmap having a size that is based on a quantity of the plurality of transmission reception points and a quantity of layers associated with the PMI; and

transmit a second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap that is indicated as non-zero by the first stage bitmap.
The UE of claim 1, wherein:

the one or more reference signals received from the plurality of transmission reception points are configured with a same transmission periodicity, and

an occasion offset difference between reference signal transmissions is configured to be less than or equal to a offset threshold duration.
The UE of claim 1, wherein the one or more reference signals received from the plurality of transmission reception points are configured with transmission triggers having a triggering offset difference that is less than or equal to a trigger threshold duration.
A network entity, comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:

transmit one or more reference signals to a user equipment (UE) ;

receive a report comprising an indication of a coherent joint transmission precoding matrix indicator (PMI) , wherein the coherent joint transmission PMI is based at least in part on the one or more reference signals and comprises one or more Doppler-domain components for each transmission reception point of a plurality of transmission reception points; and

schedule one or more resources for communication with the UE based at least in part on receiving the report.
The network entity of claim 21, wherein, to receive the report, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

receive a common Doppler basis selection for all transmission reception points of the plurality of transmission reception points.
The network entity of claim 22, wherein, to receive the report, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

receive a Doppler offset value for each transmission reception point of the plurality of transmission reception points.
The network entity of claim 23, wherein:

the Doppler offset value comprises a non-oversampled Doppler offset value, and

a sample quantity for the non-oversampled Doppler offset value is an integer value corresponding to a Doppler basis length.
The network entity of claim 23, wherein:

the Doppler offset value comprises a oversampled Doppler offset value, and

a sample quantity of the oversampled Doppler offset value is a multiple value of Doppler basis length.
The network entity of claim 21, wherein, to receive the report, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

receive an independent Doppler basis selection for each transmission reception point of the plurality of transmission reception points.
A user equipment (UE) , comprising:

a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the UE to:

receive one or more reference signals from a plurality of transmission reception points;

generate, based at least in part on receiving the one or more reference signals, a coherent joint transmission precoding matrix indicator (PMI) associated with the plurality of transmission reception points, wherein the coherent joint transmission PMI comprises one or more Doppler-domain components for each transmission reception point of the plurality of transmission reception points; and

transmit a report comprising an indication of the coherent joint transmission PMI.
The UE of claim 27, wherein, to transmit the report, the processing system is configured to cause the UE to:

transmit a common Doppler basis selection for all transmission reception points of the plurality of transmission reception points.
The UE of claim 28, wherein, to transmit the report, the processing system is configured to cause the UE to:

transmit a Doppler offset value for each transmission reception point of the plurality of transmission reception points.
A network entity, comprising:

a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the network entity to:

transmit one or more reference signals to a user equipment (UE) ;

receive a report comprising an indication of a coherent joint transmission precoding matrix indicator (PMI) , wherein the coherent joint transmission PMI is based at least in part on the one or more reference signals and comprises one or more Doppler-domain components for each transmission reception point of a plurality of transmission reception points; and

schedule one or more resources for communication with the UE based at least in part on receiving the report.