Occasion-level linkage between a sounding reference signal and channel state information reference signals for a coherent joint transmission phase report
By linking SRS and CSI-RS transmissions and receptions using the same antenna port, phase misalignment issues in CJT are addressed, improving communication reliability and efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2026-04-02
AI Technical Summary
In wireless communications systems, phase misalignment between uplink and downlink channels due to TRP-specific receive-transmit misalignment compromises coherent joint transmission (CJT) performance, leading to decoding errors and reduced communication efficiency.
Implementing an occasion-level linkage between sounding reference signal (SRS) and channel state information reference signal (CSI-RS) transmissions and receptions, ensuring the use of the same antenna port for both, based on a timing relationship to enforce phase alignment across multiple TRPs.
Enhances communication reliability and efficiency by better canceling out phase misalignment, leading to higher data rates, larger system capacity, and greater spectral efficiency.
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Figure CN2024120628_02042026_PF_FP_ABST
Abstract
Description
OCCASION-LEVEL LINKAGE BETWEEN A SOUNDING REFERENCE SIGNAL AND CHANNEL STATE INFORMATION REFERENCE SIGNALS FOR A COHERENT JOINT TRANSMISSION PHASE REPORT
[0001] FIELD OF TECHNOLOGY
[0002] The following relates to wireless communications, including occasion-level linkage between a sounding reference signal (SRS) and channel state information (CSI) reference signals (CSI-RSs) for a coherent joint transmission (CJT) phase report.BACKGROUND
[0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .
[0004] In some wireless communications systems, a UE may communicate with a network via multiple transmission and reception points (TRPs) . For example, one or more of the multiple TRPs may transmit downlink signaling to the UE and the UE may transmit uplink signaling to one or more of the multiple TRPs.SUMMARY
[0005] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0006] A method for wireless communications by a user equipment (UE) is described. The method may include transmitting, via an occasion of a sounding reference signal (SRS) resource, an SRS port using a first antenna port of the UE, receiving, via respective occasions of a set of multiple channel state information (CSI) reference signal (CSI-RS) resources associated with a set of multiple transmission and reception points (TRPs) , a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, and transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two TRPs of the set of multiple TRPs.
[0007] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, a transceiver, and one or more processors coupled with the one or more memories and the transceiver. The one or more processors may individually or collectively be operable to execute the code to cause the UE to transmit, via the transceiver and via an occasion of an SRS resource, an SRS port using a first antenna port of the UE, receive, via the transceiver and via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple TRPs, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, and transmit, via the transceiver, a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two TRPs of the set of multiple TRPs.
[0008] Another UE for wireless communications is described. The UE may include means for transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE, means for receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple TRPs, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, and means for transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two TRPs of the set of multiple TRPs.
[0009] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to transmit, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE, receive, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple TRPs, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, and transmit a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two TRPs of the set of multiple TRPs.
[0010] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a request for the measurement report, where the request indicates the respective occasions of the set of multiple CSI-RS resources via which the UE may be to measure the at least one phase offset, and where transmitting the measurement report may be further in association with receiving the request.
[0011] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first downlink control information (DCI) message that triggers the occasion of the SRS resource and receiving a second DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources.
[0012] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a single DCI message that triggers the occasion of the SRS resource and also triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources both being triggered by the single DCI message.
[0013] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a radio resource control (RRC) message or a medium access control (MAC) control element (MAC-CE) that configures or activates the SRS resource and receiving a DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the set of multiple CSI-RS resources.
[0014] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an RRC message or a MAC-CE that configures or activates the SRS resource and receiving a DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the set of multiple CSI-RS resources.
[0015] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource and receiving a second RRC message or a second MAC-CE that configures or activates the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the set of multiple CSI-RS resources.
[0016] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource and receiving a second RRC message or a second MAC-CE that configures or activates the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the set of multiple CSI-RS resources.
[0017] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the SRS resource may be a periodic or semi-persistent SRS resource and the UE transmits the measurement report including a valid phase offset quantization codepoint based on the respective occasions of the set of multiple CSI-RS resources being prior to a channel state information reference resource or the occasion of the SRS resource being prior to the channel state information reference resource.
[0018] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the UE transmits the measurement report in accordance with a channel state information report configuration, a serving cell activation, a bandwidth part change, an activation of a semi-persistent CSI-RS resource, or within discontinuous reception (DRX) active time.
[0019] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, to transmit the measurement report, the UE disregards a time restriction for a channel measurement parameter pertaining to the measurement report.
[0020] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, each TRP of the set of multiple TRPs may be associated with a respective CSI-RS resource of the set of multiple CSI-RS resources, the set of multiple CSI-RS resources may be located within a threshold time duration and without downlink or uplink switching in between the set of multiple CSI-RS resources, and the UE receives, from each TRP of the set of multiple TRPs, a respective CSI-RS of the set of multiple CSI-RSs via a respective occasion of the respective CSI-RS resource associated with that TRP.
[0021] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the measurement report may be an aperiodic measurement report and both the measurement report and the respective occasions of the set of multiple CSI-RS resources may be associated with the occasion of the SRS resource.
[0022] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the set of multiple CSI-RS resources may be a set of multiple aperiodic or semi-persistent CSI-RS resources and each CSI-RS resource of the set of multiple CSI-RS resources may be associated with a same periodicity.
[0023] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the SRS resource may be a periodic or semi-persistent SRS resource and the SRS resource may be associated with the same periodicity as the set of multiple CSI-RS resources.
[0024] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 shows an example of a wireless communications system that supports occasion-level linkage between a sounding reference signal (SRS) and channel state information (CSI) reference signals (CSI-RSs) for a coherent joint transmission (CJT) phase report in accordance with one or more aspects of the present disclosure.
[0026] FIGs. 2 and 3 show examples of inter-transmission and reception point (TRP) phase compensation schemes that support occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0027] FIG. 4 shows an example of a signaling diagram that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0028] FIGs. 5–7 show examples of communication timelines that support occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0029] FIGs. 8 and 9 show block diagrams of devices that support occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0030] FIG. 10 shows a block diagram of a communications manager that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0031] FIG. 11 shows a diagram of a system including a device that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.
[0032] FIGs. 12 and 13 show flowcharts illustrating methods that support occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0033] In some wireless communications systems, a user equipment (UE) may communicate with a network via multiple network entities or devices, such as multiple transmission and reception points (TRPs) . In some systems, each of multiple TRPs may transmit downlink signaling to the UE. In some examples, each of the multiple TRPs may transmit a same data message to the UE, which may increase a signal strength or spatial diversity associated with the data message. Such a transmission of a same data message to the UE by each of the multiple TRPs may be referred to herein as a coherent joint transmission (CJT) . A CJT may rely on close timing alignment between the TRPs to enable the UE to receive the data message from the multiple TRPs in a coherent way. Thus, to facilitate, enable, or support CJTs, the UE and the multiple TRPs may support one or more signaling schemes or mechanisms associated with inter-TRP time alignment, which may involve inter-TRP frequency / phase offset reporting. In some cases, such reporting may be understood as or include CJT calibration reporting, which may enable the multiple TRPs to obtain phase or time synchronization between each other and at the UE.
[0034] In scenarios in which there is TRP-specific receive-transmit (Rx-Tx) phase / timing misalignment, there may be a mismatch between an uplink channel from the UE and a downlink channel to the UE. To be able to cancel out the phase misalignment between uplink and downlink, the UE may be expected to use a same antenna port for both sounding reference signal (SRS) transmission and channel state information (CSI) reference signal (CSI-RS) reception. In some systems, however, a UE may support an autonomous (e.g., self-decided or implemented) mapping of an SRS port to a physical antenna of the UE and, in some cases, the UE may change the mapping over time (e.g., in accordance with antenna selection or switching decisions at the UE) . In accordance with such antenna selection or switching decisions at the UE, the UE may sometimes use a first physical antenna to transmit an SRS (e.g., an SRS port) and a second (different) physical antenna to receive a set of CSI-RSs, which may compromise a network ability to cancel out the phase misalignment between uplink and downlink, which may in turn adversely impact communication between the UE and the TRPs (due to, for example, a loss of coherency between downlink transmissions from the TRPs) . Thus, some systems may benefit from additional mechanisms according to which SRS transmissions and CSI-RS receptions can be linked at the UE, such as to enforce a rule according to which the UE may use a same physical antenna for both SRS transmission and CSI-RS reception as part of an inter-TRP phase offset reporting procedure.
[0035] Various aspects generally relate to an occasion-level linkage between SRS transmission and CSI-RS receptions to enforce or support a rule according to which a UE may use a same physical antenna for both the SRS transmission and the CSI-RS receptions as part of an inter-TRP phase offset reporting procedure. Some aspects more specifically relate to a linkage between an occasion of an SRS resource and a set of occasions of a set of CSI-RS resources where, in accordance with the linkage, a UE uses a same antenna port to transmit an SRS (e.g., an SRS port) via the occasion of the SRS resource and to receive a set of CSI-RSs via the set of occasions of the set of CSI-RS resources. For example, the UE may transmit an SRS port via an occasion of an SRS resource using a first antenna port and may receive a set of CSI-RSs via respective occasions of a set of CSI-RS resources using the same first antenna port in accordance with the linkage between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources.
[0036] In some implementations, the linkage between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources may be based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources, which may assist in enforcing the rule at the UE to refrain from performing a physical antenna switch between the SRS transmission and the CSI-RS receptions. In other words, in accordance with using the same first antenna port for the SRS transmission and the CSI-RS reception, the UE may also use a same physical antenna for the SRS transmission and the CSI-RS receptions. In some aspects, each CSI-RS resource of the set of CSI-RS resources may be associated with a respective TRP of a set of TRPs (such that the UE may receive a CSI-RS from each of the set of TRPs) .
[0037] Particular aspects of the present disclosure may be implemented to realize one or more of the following advantages. For example, by using the linkage between an SRS resource occasion and a set of CSI-RS resource occasions to enforce a rule according to which the UE uses a same antenna port (and, likewise, a same physical antenna) for both SRS transmission and CSI-RS receptions, the UE and the TRPs may be better able to cancel out a phase misalignment between uplink and downlink communications between the UE and the TRPs across various (e.g., diverse) deployment scenarios. By way of being better able to cancel out the phase misalignment between uplink and downlink communications, the UE and the TRPs may experience a higher likelihood of successful communications (e.g., fewer decoding errors or fewer message mis-detections due to timing or phase misalignment) , which may result in the higher data rates, larger system capacity, and greater spectral efficiency, among other benefits.
[0038] Aspects of the disclosure are initially described in the context of wireless communications systems. Additionally, aspects of the disclosure are further illustrated by and described with reference to inter-TRP phase compensation schemes, a signaling diagram, communication timelines, and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to occasion-level linkage between a sounding reference signal and channel state information reference signals for a coherent joint transmission phase report.
[0039] FIG. 1 shows an example of a wireless communications system 100 that supports occasion-level linkage between a sounding reference signal and channel state information reference signals for a coherent joint transmission phase report in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0040] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0041] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0042] 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.
[0043] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0044] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0045] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a 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 of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0046] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0047] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0048] 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 occasion-level linkage between a sounding reference signal and channel state information reference signals for a coherent joint transmission phase report as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0049] A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0050] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0051] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0052] 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.
[0053] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
[0054] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0055] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0056] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0057] A network entity 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a network entity 105 (e.g., using a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) . In some examples, a cell also may refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with coverage areas 110, among other examples.
[0058] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0059] The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base stations 140) may have similar frame timings, and transmissions from different network entities (e.g., different ones of the network entities 105) may be approximately aligned in time. For asynchronous operation, network entities 105 may have different frame timings, and transmissions from different network entities (e.g., different ones of network entities 105) may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.
[0060] 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.
[0061] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0062] 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.
[0063] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0064] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0065] 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.
[0066] 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.
[0067] 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) .
[0068] One or more wireless communication devices (e.g., one or more UEs 115, one or more network entities 105, one or more TRPs, or any combination thereof) of the wireless communications system 100 may support one or more signaling-or configuration-based mechanisms associated with UE reporting for CJT deployments under various conditions, including conditions involving a lack of synchronization or relatively poor backhaul conditions. Such UE reporting for CJT deployments may be associated with one or more frequency ranges (FRs) , such as FR1, and may be associated with one or both of FDD or TDD. Further, such UE reporting for CJT deployments may include inter-TRP time misalignment or frequency / phase offset measurement and reporting, with one or more of various CSI-RS designs, and with standalone aperiodic reporting via a physical uplink shared channel (PUSCH) .
[0069] In scenarios in which there is TRP-specific Rx-Tx phase / timing misalignment, there may be a mismatch between an uplink channel HUL (e.g., an uplink channel measured via SRS) and a downlink channel HDL (e.g., a downlink channel potentially for a physical downlink shared channel (PDSCH) ) . Such a mismatch may be denoted as HDL≠ (HUL) T. For example, a TDD system, SRS sounding for downlink channel measurement may be based on (e.g., associated with) reciprocity, which may be denoted or understood as HDL= (HUL) T, while channel reciprocity may become an issue for CJT-TDD. For CJT in a multi-TRP (mTRP) deployment scenario, channel reciprocity may be defined in accordance with Equation 1, shown below.
[0070] For distributed TRPs each with individual clock sources, the measured uplink channel via SRS (including transmit (Tx) and receive (Rx) phase) may be defined in accordance with Equation 2, shown below.
[0071] The downlink “channel” (including Tx and Rx phase) for a potential PDSCH may be defined in accordance with Equation 3, shown below.
[0072] In Equations 2 and 3, the Rx misalignment ψRx and the Tx misalignment ψTx (which may be for the TRPs or a UE 115, or any combination thereof) may include one or more terms or components, such as two terms or components. Such terms or components may include a time offset (denoted as τRx, τTx for Rx and Tx, respectively) and phase offset (denoted as φRx, φTx for Rx and Tx, respectively) . For example, ψRx may be defined in accordance with Equation 4, shown below, and ψTx may be defined in accordance with Equation 5, also shown below. ψRx (k) =exp (j2πkΔfτRx+jφRx) (4) ψTx (k) =exp (-j2πkΔfτTx+jφTx) (5)
[0073] To enable reciprocity-based SRS channel sounding, one or more wireless communication devices, individually or collectively, may perform one or more operations to achieve the relationship defined by Equation 6, shown below, where θmay be a TRP-common constant (with θ being known or unknown) .
[0074] One or more wireless communication devices, individually or collectively, may derive Equation 6 (or one or more aspects or components of Equation 6) in accordance with Equation 7, shown below.
[0075] Thus, to enable SRS-reciprocity in a CJT-TDD, one or more wireless communication devices, individually or collectively, may eliminate, mitigate, or reduce inter-TRP Rx-Tx timing offset (τTRP2to1) and phase offset (φTRP2to1) . For example, such one or more wireless communication devices may implement one or more signaling-or configuration-based mechanisms to achieve Equations 8 and 9, shown below.
[0076] In some aspects, the timing offset τTRP2to1 may not include a channel propagation delay. In some aspects, the phase offset φTRP2to1 may not include a channel phase.
[0077] For aperiodic standalone CJT calibration reporting in some systems, one or more wireless communication devices may support per-TRP downlink / uplink (DL / UL) Rx-Tx phase misalignment reporting. A wireless communication device may use such phase misalignment reporting for TRP selection or for inter-TRP Rx-Tx phase compensation at network side for reciprocity (e.g., using both CSI-RS and SRS for measurement) , or for both. Further, for aperiodic standalone CJT calibration reporting in some systems, given the NTRP configured non-zero power (NZP) CSI-RS resources / resource sets and the selected N resources / resource sets, a wireless communication device may support reporting, in one CSI reporting instance, where denotes the measured phase offset between the n-th CSI-RS resource / resource set and the reference CSI-RS resource / resource set nref for the frequency unit. In some systems, a wireless communication device may support Σ=1 (which may relate to, be associated with, or otherwise be indicative of wideband-averaged phase) . Additionally, or alternatively, a wireless communication device may support Σ>1 (which may relate to, be associated with, or otherwise be indicative of sub-band reporting) .
[0078] A UE 115 and multiple TRPs, such as two TRPs, may perform one or more signaling schemes according to which such wireless communication devices may facilitate measurement, reporting, and compensation of Rx phase, Tx phase, or channel phase. Such signaling schemes may involve precoding, such as Maximum Ratio Transmission (MRT) precoding, or may be absent of precoding. Additional details relating to such schemes are illustrated by and described with reference to FIGs. 2 and 3.
[0079] FIG. 2 shows an example of an inter-TRP phase compensation scheme 200 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The inter-TRP phase compensation scheme may implement or be implemented to realize one or more aspects of the wireless communications system 100. For example, a UE 115, a TRP 205-a, and a TRP 205-b may implement the inter-TRP phase compensation scheme 200. In some implementations, the inter-TRP phase compensation scheme 200 may be a scheme associated with precoded CSI-RS transmissions, such as MRT-precoded CSI-RS transmissions. For example, the CSI-RS transmissions by the TRP 205-a and the TRP 205-b may be precoded with to cancel out channel phase.
[0080] In the following description of the inter-TRP phase compensation scheme 200, the operations between the UE 115 and the TRPs may be performed in a different order than the order shown, or other operations may be added or removed from the inter-TRP phase compensation scheme 200. For example, some operations may also be left out of the inter-TRP phase compensation scheme 200 or may be performed in different orders or at different times. Further, although some operations or signaling may be shown to occur at different times for discussion purposes, these operations may actually occur at the same time. Although the UE 115 and the TRPs are shown performing the operations of the inter-TRP phase compensation scheme 200, some aspects of some operations may also be performed by one or more other wireless or network devices.
[0081] At 210, the UE 115 may transmit one or more SRSs to the TRP 205-a (denoted in the example of FIG. 2 as a TRP 1) and the TRP 205-b (denoted in the example of FIG. 2 as a TRP 2) . The TRP 205-a may determine, derive, measure, estimate, calculate, or identify an uplink channel in association with receiving an SRS transmitted by the UE 115. The TRP 205-b may determine, derive, measure, estimate, calculate, or identify an uplink channel in association with receiving an SRS (the same SRS or a different SRS as compared to the SRS received by the TRP 205-a) transmitted by the UE 115.
[0082] At 215 and 220, each TRP may transmit a precoded (single-port) CSI-RS, such as an MRT-precoded single-port CSI-RS. For example, at 215, the TRP 205-a may transmit a first precoded CSI-RS and, at 220, the TRP 205-b may transmit a second precoded CSI-RS. In some aspects, channel phase may be canceled out in accordance with the TRPs transmitting the precoded CSI-RSs. At 215, the UE 115 may determine, derive, measure, estimate, calculate, or identify a downlink channel y1 in association with receiving the precoded CSI-RS transmitted by the TRP 205-a and, at 220, the UE 115 may determine, derive, measure, estimate, calculate, or identify a downlink channel y2 in association with receiving the precoded CSI-RS transmitted by the TRP 205-b. y1and y2 may be defined in accordance with Equations 10 and 11, respectively, shown below.
[0083] At 225, the UE 115 may calculate y2*y1 on multiple subcarriers and derive an inter-TRP time alignment error (TAE) (τTRP2to1) and phase offset (φTRP2to1) . In some examples, the UE 115 may calculate y2*y1 in accordance with Equation 12, shown below.
[0084] If the TAE is less than or equal to a threshold value, such that the TAE is negligible or is relatively small, the UE 115 may directly average a wideband phase over subcarriers k in accordance with Equation 13, shown below. In other words, if TAE is relatively small, a directly wideband phase averaged over subcarriers k may be equal to φTRP2to1 as defined by Equation 13.
[0085] If the TAE is greater than the threshold value, such that the TAE is not negligible or is relatively large, the UE 115 may first estimate TAE in accordance with Equation 14, shown below.
[0086] The UE 115 may calculate a wideband / initial phase conditioned on the TAE in accordance with Equation 15, shown below.
[0087] At 230, the UE 115 may transmit a report, such as a measurement report, to one or both of the TRPs. For example, the UE 115 may transmit the report to the TRP 205-b. In some examples, the UE Rx phase and the UE Tx phase may be canceled out, such as in accordance with the UE 115 calculating The report may include information indicative of τTRP2to1 or information indicative of φTRP2to1, or both.
[0088] At 235, the TRP 205-b may synchronize with the TRP 205-a in association with receiving the report from the UE 115. For example, the TRP 205-a and the TRP 205-b may synchronize in accordance with the reported values for one or both of τTRP2to1 and φTRP2to1.
[0089] FIG. 3 shows an example of an inter-TRP phase compensation scheme 300 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. For example, a UE 115, a TRP 205-a, and a TRP 205-b may implement the inter-TRP phase compensation scheme 300. In some implementations, the inter-TRP phase compensation scheme 300 may be a scheme associated with non-MRT-precoded (which may be understood as normal or regular) CSI-RS transmissions. For purpose of example, the inter-TRP phase compensation scheme 300 may illustrate scenarios in which inter-TRP TAE is negligible or relatively small.
[0090] In the following description of the inter-TRP phase compensation scheme 300, the operations between the UE 115 and the TRPs may be performed in a different order than the order shown, or other operations may be added or removed from the inter-TRP phase compensation scheme 300. For example, some operations may also be left out of the inter-TRP phase compensation scheme 300 or may be performed in different orders or at different times. Further, although some operations or signaling may be shown to occur at different times for discussion purposes, these operations may actually occur at the same time. Although the UE 115 and the TRPs are shown performing the operations of the inter-TRP phase compensation scheme 300, some aspects of some operations may also be performed by one or more other wireless or network devices.
[0091] At 305, the UE 115 may transmit one or more SRSs to the TRP 205-a (denoted in the example of FIG. 3 as a TRP 1) and the TRP 205-b (denoted in the example of FIG. 3 as a TRP 2) . The TRP 205-a may determine, derive, measure, estimate, calculate, or identify an uplink channel in association with receiving an SRS transmitted by the UE 115. The TRP 205-b may determine, derive, measure, estimate, calculate, or identify an uplink channel in association with receiving an SRS (the same SRS or a different SRS as compared to the SRS received by the TRP 205-a) transmitted by the UE 115.
[0092] At 310, devices or components on the network side may perform a calculation to cancel out UE Tx phase. For example, one or both of the TRP 205-a or the TRP 205-b may perform the calculation to cancel out the UE Tx phase. In some aspects, one or both of the TRP 205-a or the TRP 205-b may perform the calculation in accordance with Equation 16, shown below. In some implementations, one or both of the TRP 205-a or the TRP 205-b may calculate z1*z2 on multiple subcarriers and derive the inter-TRP wideband phase offset
[0093] At 315 and 320, the UE 115 may receive non-precoded CSI-RSs from the TRPs. For example, at 315, the UE 115 may receive a first non-precoded CSI-RS from the TRP 205-a and, at 320, the UE 115 may receive a second non-precoded CSI-RS from the TRP 205-b. The first and second non-precoded CSI-RSs may be examples of non-MRT-precoded single-port CSI-RSs. At 315, the UE 115 may determine, derive, measure, estimate, calculate, or identify a downlink channel y1 in association with receiving the non-precoded CSI-RS transmitted by the TRP 205-a and, at 320, the UE 115 may determine, derive, measure, estimate, calculate, or identify a downlink channel y2 in association with receiving the non-precoded CSI-RS transmitted by the TRP 205-b. y1 and y2 may be defined in accordance with Equations 17 and 18, respectively, shown below.
[0094] At 325, the UE 115 may calculate y2*y1 on multiple subcarriers and derive an inter-TRP time wideband phase offset In some examples, the UE 115 may calculate in accordance with Equation 19, shown below. In some examples, the calculation by the UE 115 of may cancel out UE Rx phase.
[0095] At 330, the UE 115 may transmit a report, such as a measurement report, to one or both of the TRPs. For example, the UE 115 may transmit the report to the TRP 205-b. The report may include information indicative of
[0096] At 335, the TRP 205-b may calculate an inter-TRP phase offset and synchronize with the TRP 205-a. For example, the TRP 205-b may derive and synchronize to the TRP 205-a with φTRP2to1. In such examples, the network calculation (e.g., the calculation by the TRP 205-b) may be based on its own measured and the UE-reported which may result in channel phase being canceled out. In some examples, the TRP 205-b may calculate φTRP2to1 in accordance with Equation 20, shown below.
[0097] As used in Equation 20, and may be define din accordance with Equations 21 and 22, shown below.
[0098] In some cases, to support channel phase being able to be canceled out between uplink and downlink (for either the inter-TRP phase compensation scheme 200 or the inter-TRP phase compensation scheme 300) , a UE 115 may use a same antenna port to perform both SRS transmission and CSI-RS receptions. In some systems, SRS for antenna switching may be configured or linked to a CJT phase report such that, for example, for an xTyR (e.g., 1T2R, 2T2R, 2T4R, 2T6R) UE 115, a set of Q=y / x SRS resources for antenna switching can be configured, each with x ports. One port of the x port (s) of one of the Q SRS resource (s) may be configured or linked to the CSI-RSs reception. In other words, for aperiodic standalone CJT calibration reporting, when ReportQuantity is ‘cjtc-P’ (DL / UL phase offset) , the UE antenna port (s) for receiving the CSI-RS configured for phase offset measurement may be the same as the UE antenna port (s) for transmitting the selected / configured port (s) from the associated SRS resource (s) . Further, for aperiodic standalone CJT calibration reporting, when ReportQuantity is ‘cjtc-P’ (DL / UL phase offset) , a selection of PSRS=1 SRS port corresponding to the ‘reference UE antenna port’ (out of available port (s) ) may be network-configured via higher-layer (e.g., RRC) signaling.
[0099] In some systems, however, for the mapping between SRS port and a physical antenna of a UE 115, it may be left to (autonomous) UE decision. In other words, different UEs 115 may employ different mappings between SRS ports and one or more physical antennas of the UE 115, and may update or change the mapping over time. For example, for periodic or semi-persistent SRS resources, for each SRS occasion over time, a UE 115 may not guarantee the mapping is unchanged (leaving some flexibility to the UE 115 for antenna selection / switching over time) . Thus, some systems may benefit from additional mechanisms for a linkage definition between an SRS transmission and a CSI-RS reception to enable or constrain a UE 115 to use a same physical of the UE 115 for both the SRS transmission and the CSI-RS reception.
[0100] Accordingly, in some implementations, a UE 115 may support one or more signaling-or configuration-based mechanisms according to which the UE 115, for a CJT inter-TRP phase offset report, may support an occasion-level linkage between SRS and NTRP>1 (e.g., multiple, such as NTRP = 2, 3, or 4) CSI-RSs. In accordance with such an occasion-level linkage between the SRS and the multiple CSI-RSs, the UE 115 may use a same antenna port for receiving CSI-RSs via a set of CSI-RS occasions and for transmitting a configured SRS port via an SRS occasion. For example, the UE 115 may transmit an SRS (e.g., an SRS port) via an occasion of an SRS resource (which may be an aperiodic, semi-persistent, or periodic SRS resource) using a first antenna port (or a first set of antenna ports) and may receive a set of CSI-RSs via respective occasions of a set of CSI-RS resources (which may be aperiodic, semi-persistent, or periodic CSI-RS resources) using the same first antenna port (or the same first set of antenna ports) . Additional details relating to such an occasion-level linkage between SRS and CSI-RSs are illustrated and described herein, including by and with reference to FIGs. 4–7.
[0101] FIG. 4 shows an example of a signaling diagram 400 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The signaling diagram 400 may implement or be implemented to realize one or more aspects of the wireless communications system 100, the inter-TRP phase compensation scheme 200, or the inter-TRP phase compensation scheme 300. For example, the signaling diagram 400 illustrates communication between a UE 115, a TRP 205-a, and a TRP 205-b, which may be examples of corresponding devices as illustrated and described herein.
[0102] The UE 115 may communicate with the TRP 205-a and the TRP 205-b via one or more communication links 405, which may include a first communication link between the UE 115 and the TRP 205-a and a second communication link between the UE 115 and the TRP 205-b. In the example of FIG. 4, communication to or from the TRP 205-a or the TRP 205-b may collectively be understood as communication to or from the network (abbreviated as “NW” in the example of FIG. 4) .
[0103] In some implementations, the UE 115, the TRP 205-a, and the TRP 205-b may support an occasion-level linkage between SRS and NTRP>1 (e.g., multiple) CSI-RSs. In accordance with such an occasion-level linkage between the SRS and the multiple CSI-RSs, the UE 115 may use a same antenna port for receiving CSI-RSs via a set of CSI-RS occasions and for transmitting a configured SRS port via an SRS occasion. In some examples, the set of CSI-RS occasions may be associated with or denoted as a named CSI-RS occasion group (as there may be NTRP occasions, such that each TRP transmits a respective CSI-RS via a respective occasion) . In some implementations, the UE 115 may use a first antenna port to transmit an SRS 410 (e.g., an SRS port) via an occasion of an SRS resource and may use the first antenna port to receive a set of CSI-RSs 415 via respective occasions of a set of CSI-RS resources. In some examples, the UE 115 may use the first antenna port to transmit the SRS 410 and to receive the set of CSI-RSs 415 in accordance with a linkage 420 between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources.
[0104] In association with transmitting the SRS 410 using the first antenna port and receiving the set of CSI-RSs 415 using the first antenna port, the UE 115 may transmit a measurement report 425. The measurement report 425 may be an example of a report transmitted at 230 or at 330 as illustrated by and described with reference to the inter-TRP phase compensation scheme 200 and the inter-TRP phase compensation scheme 300, respectively. For example, the measurement report 425 may include information pertaining to at least one phase offset between at least two TRPs (e.g., at least the TRP 205-a and the TRP 205-b) of a set of two or more TRPs. The measurement report 425 may include additional, or alternative, information as described herein. The UE 115 may transmit the measurement report 425 via a PUSCH, such as via a PUSCH resource indicated or scheduled by a triggering or scheduling downlink control information (DCI) message.
[0105] In some examples, the linkage 420 may be based on or otherwise associated with a timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources. Such a timing relationship may define which SRS resource occasion (s) is (are) linked with which CSI-RS resource occasion (s) and, in some implementations, may depend on a type of the SRS resource (s) or the type of the CSI-RS resource (s) . For example, the linkage 420 may be based on a first timing relationship or a second timing relationship depending on the types of the SRS resource (s) or the type of the CSI-RS resource (s) . As described herein, a type of a resource (e.g., an SRS resource or a CSI-RS resource) may refer to an aperiodic resource, a semi-persistent resource, or a periodic resource. Further, an aperiodic resource may be triggered by a DCI format, a semi-persistent resource may be activated by a DCI format or a MAC control element (MAC-CE) , and a periodic resource may be configured by RRC signaling. Further, as described herein, an “occasion” of a resource may refer to a distinct instance of the resource, such as a distinct time and / or frequency location of the resource via which a signal is transmitted or received.
[0106] For example, in scenarios in which the SRS 410 is associated with an aperiodic SRS resource and in which the set of CSI-RSs 415 is associated with aperiodic CSI-RS resources, the linkage 420 may be based on a first timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources. In examples in which an aperiodic SRS and aperiodic CSI-RSs are trigged by two separate DCIs, respectively, the measurement report 425 (e.g., an aperiodic report, which may be triggered by the same DCI that triggers the aperiodic CSI-RSs) and the aperiodic CSI-RSs may be linked to a most recent (in time) aperiodic SRS in accordance with the first timing relationship. In such examples, the aperiodic CSI-RSs (and the DCI triggering the aperiodic CSI-RSs) may appear (e.g., be located or positioned in time) after the aperiodic SRS (and the DCI triggering the aperiodic SRS) .
[0107] Such a timing between the aperiodic SRS and the aperiodic CSI-RSs may provide benefits for MRT-precoding of the aperiodic CSI-RSs, as the TRP 205-a and the TRP 205-b may expect to receive SRS first (e.g., before CSI-RS transmission) to be able to perform MRT-precoding. Additional details relating to such an example first timing relationship are illustrated and described herein, including by and with reference to FIG. 5. Alternatively, in examples in which the aperiodic SRS and the aperiodic CSI-RSs are triggered by a same DCI, the first timing relationship may define or indicate that an aperiodic SRS occasion and a set of aperiodic CSI-RS occasions are linked (such that the UE 115 uses a same antenna port for both) in accordance with the aperiodic SRS occasion and the aperiodic CSI-RS occasions being triggered by a same DCI.
[0108] By way of further example, in scenarios in which the SRS 410 is associated with an aperiodic SRS resource and the set of CSI-RSs 415 is associated with periodic or semi-persistent CSI-RS resources, the linkage 420 may be based on a second timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources. In some aspects, such scenarios may be associated with an error case. In other words, the UE 115, the TRP 205-a, and the TRP 205-b may not expect a linkage 420 in scenarios in which the SRS 410 is an aperiodic SRS and the set of CSI-RSs 415 are periodic or semi-persistent CSI-RSs. Thus, in such aspects, the second timing relationship may indicate that no linking between the SRS 410 and the set of CSI-RSs 415 can or is expected to occur. In some examples, a network specification may prohibit a linkage 420 in scenarios in which the SRS 410 is an aperiodic SRS and the set of CSI-RSs 415 are periodic or semi-persistent CSI-RSs, as it may not be meaningful for MRT-precoded CSI-RSs (periodic CSI-RSs occasion groups over time may not always be precoded by the network based on a same previously received aperiodic SRS, as the same previously received aperiodic SRS may become outdated) . Further, for non-MRT-precoded CSI-RSs, it may not be meaningful to allow the UE 115 to calculate a phase offset over time linked to a potentially outdated aperiodic SRS.
[0109] By way of further example, in scenarios in which the SRS 410 is associated with a periodic or semi-persistent SRS resource and the set of CSI-RSs 415 is associated with aperiodic CSI-RS resources, the linkage 420 may be based on a third timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources. Such a third timing relationship may define or indicate that a set of aperiodic CSI-RSs are linked to a nearest in time (before or after) occasion of a periodic or semi-persistent SRS. Additionally, or alternatively, such a third timing relationship may define or indicate that a set of aperiodic CSI-RSs are linked to a most recent SRS satisfying a time gap before an initial or first in time symbol of the set of aperiodic CSI-RSs. Such a time gap may be denoted as δ. The time gap δ may be a quantity of one or more symbols or a quantity of one or more slots, or any combination thereof, such as a few (e.g., 2, 3, or 4) symbols or 1 or 2 slots. The time gap δ may define or indicate a (lower limit) time duration used by the TRP 205-a or the TRP 205-b, or both, to MRT-precode the CSI-RSs. Additional details relating to such example third timing relationships are illustrated and described herein, including by and with reference to FIGs. 6 and 7.
[0110] By way of further example, in scenarios in which the SRS 410 is associated with a periodic or semi-persistent SRS resource and the set of CSI-RSs 415 is associated with periodic or semi-persistent CSI-RS resources, the linkage 420 may be based on a fourth timing relationship between the occasion of the SRS resource and the respective occasions of the set of CSI-RS resources. In some examples, such a fourth timing relationship may define or indicate that each periodic or semi-persistent CSI-RS occasion group is linked to a nearest in time (before or after) occasion of the periodic or semi-persistent SRS. Additionally, or alternatively, such a fourth timing relationship may define or indicate that each periodic or semi-persistent CSI-RS occasion group is linked to a most recent occasion of the periodic or semi-persistent SRS resource satisfying a time gap (e.g., δ) before an initial or first in time symbol of the CSI-RSs (e.g., the periodic or semi-persistent CSI-RS occasion group) . For example, the fourth timing relationship may define or indicate that the set of CSI-RSs 415 is linked with the SRS 410 in accordance with the SRS 410 being a most recent in time SRS transmission that is also earlier in time than the set of CSI-RSs 415 by at least the time gap δ. The time gap δ may be a quantity of one or more symbols or a quantity of one or more slots, or any combination thereof, such as a few (e.g., 2, 3, or 4) symbols or 1 or 2 slots. The time gap δ may define or indicate a (lower limit) time duration used by the TRP 205-a or the TRP 205-b, or both, to MRT-precode the CSI-RSs.
[0111] In some examples in which the set of CSI-RSs 415 are periodic or semi-persistent CSI-RSs, each of the NTRP periodic or semi-persistent CSI-RSs may have or be associated with (e.g., in accordance with a rule or expectation) a same periodicity such that, for example, a CSI-RS occasion group is associated with a same (e.g., a common) periodicity. Additionally, in some examples, a set of periodic or semi-persistent SRSs may have or be associated with (e.g., in accordance with a rule or expectation) a same periodicity as the periodic or semi-persistent CSI-RSs.
[0112] In some aspects, in scenarios in which the SRS 410 is a periodic or semi-persistent SRS and the set of CSI-RSs 415 include aperiodic CSI-RSs, or in which the SRS 410 is a periodic or semi-persistent SRS and the set of CSI-RSs 415 include periodic or semi-persistent CSI-RSs, the CSI-RSs of the set of CSI-RSs 415 may be located (in accordance with a rule or expectation) within a threshold time duration of each other (e.g., within a same slot, within two adjacent slots, or otherwise within a threshold quantity of symbols or slots of each other) . In some examples, there (in accordance with a rule or expectation) may be an absence of a downlink / uplink switch between the CSI-RSs of the set of CSI-RSs 415. In other words, from the first symbol to the last symbol of the CSI-RSs of the set of CSI-RSs 415, there may be an absence or lack (in accordance with the rule or expectation) of switching between downlink and uplink.
[0113] In some systems, after a CSI report (re) configuration, serving cell activation, bandwidth part (BWP) change, or activation of semi-persistent CSI, the UE 115 may report (e.g., transmit) a CSI report in accordance with (e.g., after) receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI interference measurement (CSI-IM) occasion for interference measurement no later than a CSI reference resource and may drop the report otherwise. Further, in some systems, when discontinuous reception (DRX) is configured, the UE 115 may report a CSI report if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement in DRX active time no later than a CSI reference resource and may drop the report otherwise.
[0114] In some implementations, if the UE 115 is configured with a linkage to a periodic or semi-persistent SRS, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of semi-persistent CSI, or when DRX is configured, the UE 115 may report (e.g., transmit) a phase offset report with a “valid” phase offset quantization codepoint on one or more conditions. Such a condition may be associated with (e.g., dependent on) CSI-RSs or may be associated with (e.g., dependent on) SRS, or both. For example, a first condition may specify, define, or indicate that the associated CSI-RSs are received via the two or more CSI-RS occasions before the CSI reference resource (within a DRX active time) . In such examples, while CSI-RS occasions via which CSI-RSs are not received may be reported as an “invalid” codepoint, otherwise (e.g., a CSI-RS is received via none or one of the CSI-RS occasions) the UE 115 may report all the NTRP-1 phase offsets as an “invalid” codepoint (e.g., an invalid codepoint for each of the reported NTRP-1 phase offsets) . By way of further example, a second condition may specify, define, or indicate that an SRS (e.g., an SRS port) is transmitted via at least one linked SRS occasion before the CSI reference resource (within a DRX active time) , otherwise the UE 115 may report all the NTRP-1 POs as an “invalid” codepoint (e.g., an invalid codepoint for each of the reported NTRP-1 phase offsets) or the UE 115 may autonomously select or decide to use which antenna ports to receive the CSI-RSs and report “valid” phase offset codepoint (s) .
[0115] In some systems, if the UE 115 is not configured with a higher layer parameter (e.g., an RRC parameter) timeRestrictionForChannelMeasurements, the UE 115 may derive the channel measurements for computing the CSI value reported in uplink slot n based on (only) the NZP CSI-RS, no later than the CSI reference resource, associated with the CSI resource setting. If the UE 115 is configured with the higher layer parameter timeRestrictionForChannelMeasurements in CSI-ReportConfig, the UE 115 may derive the channel measurements for computing the CSI reported in uplink slot n based on (only) the most recent, no later than the CS reference resource, occasion of NZP CSI-RS associated with the CSI resource setting. In some implementations, the RRC parameter timeRestrictionForChannelMeasurements may not be applicable (or may be constrained or limited to be set as “configured” ) for the measurement report 425 (e.g., the phase offset report associated with occasion-level linking between the SRS 410 and the set of CSI-RSs 415) .
[0116] FIG. 5 shows an example of a communication timeline 500 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The communication timeline 500 may implement or be implemented to realize one or more aspects of the wireless communications system 100, the inter-TRP phase compensation scheme 200, the inter-TRP phase compensation scheme 300, or the signaling diagram 400. For example, the communication timeline 500 illustrates communication between a UE 115 and the network (abbreviated as “NW” in the example of FIG. 5) , which may include or be associated with a TRP 205-a and a TRP 205-b. Thus, as used herein, the “network” may refer to the TRP 205-a or the TRP 205-b, or both, potentially among one or more other network devices.
[0117] The communication timeline 500 illustrates an example scenario of a DCI mis-detection at the UE 115 for aperiodic SRS. In other words, the communication timeline 500 illustrates an example scenario in which the SRS 410 is an aperiodic SRS and in which the set of CSI-RSs 415 are aperiodic CSI-RSs triggered by separate DCIs, with a mis-detection of a DCI triggering the aperiodic SRS. For example, at 505, the network may transmit an aperiodic SRS DCI (e.g., a DCI message triggering an SRS resource occasion) and the aperiodic SRS DCI may be mis-detected at the UE 115. Thus, at 510, the network may fail to receive an SRS from the UE 115 (as the UE 115 may not transmit the SRS in accordance with the mis-detection of the DCI triggering the aperiodic SRS. In some implementations, the network may implement a signaling mechanism to resolve such cases of a mis-detection of the SRS triggering DCI.
[0118] For example, at 515, the network may trigger another aperiodic SRS. In other words, the network may re-transmit the aperiodic SRS DCI to the UE 115. In some examples, the UE 115 may continuously trigger aperiodic SRS transmissions from the UE 115 until the UE 115 successfully transmits an aperiodic SRS. In the example of FIG. 5, the UE 115 may receive the aperiodic SRS DCI at 515 and, at 520, may transmit an aperiodic SRS accordingly. At 525, in association with receiving the SRS at 520, the network may transmit an aperiodic report DCI. The aperiodic report DCI may be a DCI that triggers a set of aperiodic CSI-RSs or that triggers transmission of a report (e.g., a measurement report) from the UE 115, or both. Thus, in some examples, the network may expect to trigger an aperiodic SRS transmission before triggering aperiodic CSI-RSs and the aperiodic report of the inter-TRP phase offset.
[0119] At 530, the UE 115 may receive the set of CSI-RSs (via respective occasions of a set of aperiodic CSI-RS resources associated with the multiple TRPs) . The UE 115 may determine that the SRS transmitted at 520 is linked with the CSI-RSs transmitted at 530 in accordance with a linkage between the occasion via which the SRS is transmitted and the respective occasions via which the CSI-RSs are transmitted (which may be based on the first timing relationship, such as based on the SRS occasion being a most recent SRS occasion to the CSI-RSs) . In accordance with determining the linkage, the UE 115 may use a same antenna port to receive the CSI-RSs at 530 as the UE 115 used for transmitting the SRS at 520.
[0120] At 535, the UE 115 may transmit a measurement report to the network. The measurement report that the UE 115 transmits at 535 may include at least an indication of a phase offset between two or more TRPs, such as between the TRP 205-a and the TRP 205-b. The measurement report that the UE 115 transmits at 535 may be an example of the measurement report 425 as illustrated by and described with reference to FIG. 4.
[0121] FIG. 6 shows an example of a communication timeline 600 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The communication timeline 600 may implement or be implemented to realize one or more aspects of the wireless communications system 100, the inter-TRP phase compensation scheme 200, the inter-TRP phase compensation scheme 300, or the signaling diagram 400. For example, the communication timeline 600 illustrates communication between a UE 115 and the network (abbreviated as “NW” in the example of FIG. 6) , which may include or be associated with a TRP 205-a and a TRP 205-b. Thus, as used herein, the “network” may refer to the TRP 205-a or the TRP 205-b, or both, potentially among one or more other network devices.
[0122] The communication timeline 600 illustrates an example scenario in which the SRS 410 is a periodic or semi-persistent SRS and the set of CSI-RSs 415 includes aperiodic CSI-RSs. Accordingly, a linkage between an SRS occasion and respective occasions of a set of CSI-RSs may be based on or otherwise associated with the third timing relationship between the SRS occasion and the respective occasions of the set of CSI-RSs. In the example of the communication timeline 600, the third timing relationship may define or indicate that the aperiodic CSI-RSs are linked to a nearest in time (before or after) occasion of the periodic or semi-persistent SRS.
[0123] At 605, the UE 115 may transmit a first SRS via a first occasion of a periodic or semi-persistent SRS resource using a first antenna port of the UE 115. At 610, the UE 115 may receive, from the network, a DCI message. The DCI message may be an aperiodic report DCI that triggers a set of aperiodic CSI-RSs or that triggers transmission of a report (e.g., a measurement report) from the UE 115, or both. At 615, the UE 115 may receive, via respective occasions of a set of the triggered aperiodic CSI-RS resources, a set of CSI-RSs. In some implementations, the UE 115 may determine that the respective occasions of the set of the triggered aperiodic CSI-RS resources are linked (in accordance with the linkage 420) with the first occasion of the periodic or semi-persistent SRS resource. The UE 115 may determine the linkage 420 in accordance with the first SRS occasion being a nearest in time SRS occasion to the CSI-RSs transmitted at 615. Further, in examples in which the linked SRS is transmitted prior to the linked CSI-RSs, the CSI-RSs may be MRT-precoded CSI-RSs or non-MRT-precoded CSI-RSs.
[0124] In accordance with the linkage 420 between the respective occasions of the set of the triggered aperiodic CSI-RS resources and the first occasion of the periodic or semi-persistent SRS resource, the UE 115 may use a first antenna port for both transmission of the SRS at 605 and reception of the CSI-RSs at 615. At 620, the UE 115 may transmit a measurement report to the network. The measurement report that the UE 115 transmits at 620 may include at least an indication of a phase offset between two or more TRPs, such as between the TRP 205-a and the TRP 205-b. The measurement report that the UE 115 transmits at 620 may be an example of the measurement report 425 as illustrated by and described with reference to FIG. 4.
[0125] At 625, the UE 115 may transmit a second SRS via a second occasion of the periodic or semi-persistent SRS resource. The UE 115 may use the first antenna port or a different antenna port to perform the second SRS transmission at 625. The UE 115 may transmit the second SRS in accordance with a periodicity 650 associated with the periodic or semi-persistent SRS resource.
[0126] At 630, the UE 115 may receive, from the network, a DCI message. The DCI message may be an aperiodic report DCI that triggers a set of aperiodic CSI-RSs or that triggers transmission of a report (e.g., a measurement report) from the UE 115, or both. At 635, the UE 115 may receive, via respective occasions of a set of the triggered aperiodic CSI-RS resources, a set of CSI-RSs. The UE 115 may use a second antenna port (which may be the same as or different from the first antenna port) to receive the set of CSI-RSs. At 640, the UE 115 may transmit a third SRS via a third occasion of the periodic or semi-persistent SRS resource. The UE 115 may transmit the third SRS in accordance with the periodicity 650 associated with the periodic or semi-persistent SRS resource. In some implementations, the UE 115 may determine that the respective occasions of the set of the triggered aperiodic CSI-RS resources are linked (in accordance with the linkage 420) with the third occasion of the periodic or semi-persistent SRS resource. In scenarios in which the SRS is after the CSI-RSs, the CSI-RSs transmitted at 635 may be non-MRT-precoded CSI-RSs. In other words, the CSI-RSs may be non-MRT-precoded CSI-RSs based on or otherwise in accordance with the CSI-RSs preceding the linked SRS occasion.
[0127] The UE 115 may determine the linkage 420 in accordance with the third SRS occasion being a nearest in time SRS occasion to the CSI-RSs transmitted at 635. In accordance with determining the linkage 420, the UE 115 may use the second antenna port to perform the third SRS transmission at 640 (e.g., the same antenna port that the UE 115 uses to receive the CSI-RSs at 635) . In other words, in accordance with the linkage 420 between the respective occasions of the set of the triggered aperiodic CSI-RS resources and the third occasion of the periodic or semi-persistent SRS resource, the UE 115 may use the second antenna port for both transmission of the SRS at 640 and reception of the CSI-RSs at 635.
[0128] At 645, the UE 115 may transmit a measurement report to the network. The measurement report that the UE 115 transmits at 645 may include at least an indication of a phase offset between two or more TRPs, such as between the TRP 205-a and the TRP 205-b. The measurement report that the UE 115 transmits at 645 may be an example of the measurement report 425 as illustrated by and described with reference to FIG. 4.
[0129] FIG. 7 shows an example of a communication timeline 700 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The communication timeline 700 may implement or be implemented to realize one or more aspects of the wireless communications system 100, the inter-TRP phase compensation scheme 200, the inter-TRP phase compensation scheme 300, or the signaling diagram 400. For example, the communication timeline 700 illustrates communication between a UE 115 and the network (abbreviated as “NW” in the example of FIG. 7) , which may include or be associated with a TRP 205-a and a TRP 205-b. Thus, as used herein, the “network” may refer to the TRP 205-a or the TRP 205-b, or both, potentially among one or more other network devices.
[0130] The communication timeline 700 illustrates an example scenario in which the SRS 410 is a periodic or semi-persistent SRS and the set of CSI-RSs 415 includes aperiodic CSI-RSs. Accordingly, a linkage between an SRS occasion and respective occasions of a set of CSI-RSs may be based on or otherwise associated with the third timing relationship between the SRS occasion and the respective occasions of the set of CSI-RSs. In the example of the communication timeline 700, the third timing relationship may define or indicate that the aperiodic CSI-RSs are linked to a most recent SRS satisfying a time gap δ (e.g., a quantity of symbols or a quantity of slots, or any combination thereof) before a first (e.g., initial, such as first in time) symbol of the CSI-RSs. In some aspects, the TRP 205-a and the TRP 205-b may use such a time gap δ to precode, such as MRT-precode, the CSI-RSs.
[0131] At 705, the UE 115 may transmit a first SRS (e.g., a first SRS port) via a first occasion of a periodic or semi-persistent SRS resource using a first antenna port of the UE 115. At 710, the UE 115 may transmit a second SRS via second occasion of the periodic or semi-persistent SRS resource. The UE 115 may transmit the second SRS using a second antenna port, which may be the same as or different from the first antenna port. The UE 115 may transmit the second SRS via the second occasion of the periodic or semi-persistent SRS resource in accordance with a periodicity 735 associated with the periodic or semi-persistent SRS resource.
[0132] At 715, the UE 115 may receive, from the network, a DCI message. The DCI message may be an aperiodic report DCI that triggers a set of aperiodic CSI-RSs or that triggers transmission of a report (e.g., a measurement report) from the UE 115, or both. At 720, the UE 115 may receive, via respective occasions of a set of the triggered aperiodic CSI-RS resources, a set of CSI-RSs. In some implementations, the UE 115 may determine that the respective occasions of the set of the triggered aperiodic CSI-RS resources are linked (in accordance with the linkage 420) with the second occasion of the periodic or semi-persistent SRS resource. The UE 115 may determine the linkage 420 in accordance with the second SRS occasion being a most recent SRS occasion that satisfies a time gap 740 (e.g., the time gap δ) . In other words, the second SRS occasion via which the UE 115 transmits the SRS at 710 may be at least the time gap 740 prior to an earliest symbol of the CSI-RSs transmitted at 720.
[0133] In accordance with determining the linkage 420, the UE 115 may use the second antenna port to receive the CSI-RSs at 720 (e.g., the same antenna port that the UE 115 uses to transmit the SRS at 710) . In other words, in accordance with the linkage 420 between the respective occasions of the set of the triggered aperiodic CSI-RS resources and the second occasion of the periodic or semi-persistent SRS resource, the UE 115 may use the second antenna port for both transmission of the SRS at 710 and reception of the CSI-RSs at 720.
[0134] At 725, the UE 115 may transmit a measurement report to the network. The measurement report that the UE 115 transmits at 725 may include at least an indication of a phase offset between two or more TRPs, such as between the TRP 205-a and the TRP 205-b. The measurement report that the UE 115 transmits at 725 may be an example of the measurement report 425 as illustrated by and described with reference to FIG. 4.
[0135] At 730, the UE 115 may transmit a third SRS via a third occasion of the periodic or semi-persistent SRS resource. The UE 115 may transmit the third SRS using a third antenna port, which may be the same as or different from the first antenna port, or which may be the same as or different from the second antenna port. The UE 115 may transmit the third SRS via the third occasion of the periodic or semi-persistent SRS resource in accordance with the periodicity 735 associated with the periodic or semi-persistent SRS resource.
[0136] Further, as described herein, an SRS port may mean, refer to, or be an example of a time resource, a frequency resource, a code resource (e.g., a cyclic shift) , or any combination thereof that is transmitted or is used to transmit an SRS via an antenna port of the UE 115. Such a time resource, frequency resource, code resource (e.g., cyclic shift) , or any combination thereof may be a component of an SRS resource and hence may be considered a partial resource. For example, an SRS port may be a specific time domain resource (of potentially multiple time domain resources) , a specific frequency domain resource (of potentially multiple frequency domain resources) , a specific code domain resource (of potentially multiple code domain resources) , or any combination thereof associated with an SRS resource. Thus, in some aspects, transmitting an SRS port may be equivalently understood as or may refer to transmitting an SRS using, via, or in accordance with such a partial resource of an SRS resource (e.g., the partial resource of the SRS resource corresponding to the SRS port) .
[0137] FIG. 8 shows a block diagram 800 of a device 805 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The device 805 may be an example of aspects of a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to, 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) .
[0138] The receiver 810 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to occasion-level linkage between an SRS and CSI-RSs for a CJT phase report) . Information may be passed on to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.
[0139] The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to occasion-level linkage between an SRS and CSI-RSs for a CJT phase report) . In some examples, the transmitter 815 may be co-located with a receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.
[0140] The communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be examples of means for performing various aspects of occasion-level linkage between an SRS and CSI-RSs for a CJT phase report 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.
[0141] 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 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) .
[0142] 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 (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 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) .
[0143] 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.
[0144] 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, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. In some aspects, an SRS port may mean or refer to the time / frequency and / or code (e.g., cyclic shift) resource (e.g., a partial resource of the SRS resource) transmitted by or using the first antenna port. Thus, in some aspects, transmitting an SRS port may be equivalently understood as or refer to transmitting an SRS using, via, or in accordance with the partial resource of the SRS resource (e.g., the partial resource of the SRS resource corresponding to the SRS port) . The communications manager 820 is capable of, configured to, or operable to support a means for receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The communications manager 820 is capable of, configured to, or operable to support a means for transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points.
[0145] 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, reduced power consumption, and more efficient utilization of communication resources.
[0146] FIG. 9 shows a block diagram 900 of a device 905 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report 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 UE 115 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, 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) .
[0147] The receiver 910 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 occasion-level linkage between an SRS and CSI-RSs for a CJT phase report) . Information may be passed on to other components of the device 905. The receiver 910 may utilize a single antenna or a set of multiple antennas.
[0148] The transmitter 915 may provide a means for transmitting signals generated by other components of the device 905. For example, the transmitter 915 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 occasion-level linkage between an SRS and CSI-RSs for a CJT phase report) . In some examples, the transmitter 915 may be co-located with a receiver 910 in a transceiver module. The transmitter 915 may utilize a single antenna or a set of multiple antennas.
[0149] The device 905, or various components thereof, may be an example of means for performing various aspects of occasion-level linkage between an SRS and CSI-RSs for a CJT phase report as described herein. For example, the communications manager 920 may include an SRS transmission component 925, a CSI-RS reception component 930, a measurement reporting component 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.
[0150] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The SRS transmission component 925 is capable of, configured to, or operable to support a means for transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. The CSI-RS reception component 930 is capable of, configured to, or operable to support a means for receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The measurement reporting component 935 is capable of, configured to, or operable to support a means for transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points.
[0151] FIG. 10 shows a block diagram 1000 of a communications manager 1020 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report 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 occasion-level linkage between an SRS and CSI-RSs for a CJT phase report as described herein. For example, the communications manager 1020 may include an SRS transmission component 1025, a CSI-RS reception component 1030, a measurement reporting component 1035, a L1 component 1040, a L2 / L3 component 1045, 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) .
[0152] The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. The SRS transmission component 1025 is capable of, configured to, or operable to support a means for transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. The CSI-RS reception component 1030 is capable of, configured to, or operable to support a means for receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The measurement reporting component 1035 is capable of, configured to, or operable to support a means for transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points.
[0153] In some examples, the measurement reporting component 1035 is capable of, configured to, or operable to support a means for receiving a request for the measurement report, where the request indicates the respective occasions of the set of multiple CSI-RS resources via which the UE is to measure the at least one phase offset, and where transmitting the measurement report is further in association with receiving the request.
[0154] In some examples, the L1 component 1040 is capable of, configured to, or operable to support a means for receiving a first DCI message that triggers the occasion of the SRS resource. In some examples, the L1 component 1040 is capable of, configured to, or operable to support a means for receiving a second DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources.
[0155] In some examples, the L1 component 1040 is capable of, configured to, or operable to support a means for receiving a single DCI message that triggers the occasion of the SRS resource and also triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources both being triggered by the single DCI message.
[0156] In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving an RRC message or a MAC-CE that configures or activates the SRS resource. In some examples, the L1 component 1040 is capable of, configured to, or operable to support a means for receiving a DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the set of multiple CSI-RS resources.
[0157] In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving an RRC message or a MAC-CE that configures or activates the SRS resource. In some examples, the L1 component 1040 is capable of, configured to, or operable to support a means for receiving a DCI message that triggers the respective occasions of the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the set of multiple CSI-RS resources.
[0158] In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource. In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving a second RRC message or a second MAC-CE that configures or activates the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the set of multiple CSI-RS resources.
[0159] In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource. In some examples, the L2 / L3 component 1045 is capable of, configured to, or operable to support a means for receiving a second RRC message or a second MAC-CE that configures or activates the set of multiple CSI-RS resources, where the timing relationship includes the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the set of multiple CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the set of multiple CSI-RS resources.
[0160] In some examples, the SRS resource is a periodic or semi-persistent sounding reference signal resource. In some examples, the UE transmits the measurement report including a valid phase offset quantization codepoint based on the respective occasions of the set of multiple CSI-RS resources being prior to a channel state information reference resource or the occasion of the SRS resource being prior to the channel state information reference resource.
[0161] In some examples, the UE transmits the measurement report in accordance with a channel state information report configuration, a serving cell activation, a bandwidth part change, an activation of a semi-persistent CSI-RS resource, or within a DRX active time.
[0162] In some examples, to transmit the measurement report, the UE disregards a time restriction for a channel measurement parameter pertaining to the measurement report.
[0163] In some examples, each transmission and reception point of the set of multiple transmission and reception points is associated with a respective CSI-RS resource of the set of multiple CSI-RS resources. In some examples, the set of multiple CSI-RS resources is located within a threshold time duration and without downlink or uplink switching in between the set of multiple CSI-RS resources. In some examples, the UE receives, from each transmission and reception point of the set of multiple transmission and reception points, a respective CSI-RS of the set of multiple CSI-RSs via a respective occasion of the respective CSI-RS resource associated with that transmission and reception point.
[0164] In some examples, the measurement report is an aperiodic measurement report. In some examples, both the measurement report and the respective occasions of the set of multiple CSI-RS resources are associated with the occasion of the SRS resource.
[0165] In some examples, the set of multiple CSI-RS resources is a set of multiple aperiodic or semi-persistent CSI-RS resources. In some examples, each CSI-RS resource of the set of multiple CSI-RS resources is associated with a same periodicity.
[0166] In some examples, the SRS resource is a periodic or semi-persistent sounding reference signal resource. In some examples, the SRS resource is associated with the same periodicity as the set of multiple CSI-RS resources.
[0167] FIG. 11 shows a diagram of a system 1100 including a device 1105 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The device 1105 may be an example of or include components of a device 805, a device 905, or a UE 115 as described herein. The device 1105 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 1105 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 1120, an input / output (I / O) controller, such as an I / O controller 1110, a transceiver 1115, one or more antennas 1125, at least one memory 1130, code 1135, and at least one processor 1140. 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 1145) .
[0168] The I / O controller 1110 may manage input and output signals for the device 1105. The I / O controller 1110 may also manage peripherals not integrated into the device 1105. In some cases, the I / O controller 1110 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 1110 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 1110 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 1110 may be implemented as part of one or more processors, such as the at least one processor 1140. In some cases, a user may interact with the device 1105 via the I / O controller 1110 or via hardware components controlled by the I / O controller 1110.
[0169] In some cases, the device 1105 may include a single antenna. However, in some other cases, the device 1105 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1115 may communicate bi-directionally via the one or more antennas 1125 using wired or wireless links as described herein. For example, the transceiver 1115 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1115 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1125 for transmission, and to demodulate packets received from the one or more antennas 1125. The transceiver 1115, or the transceiver 1115 and one or more antennas 1125, may be an example of a transmitter 815, a transmitter 915, a receiver 810, a receiver 910, or any combination thereof or component thereof, as described herein.
[0170] The at least one memory 1130 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 1130 may store computer-readable, computer-executable, or processor-executable code, such as the code 1135. The code 1135 may include instructions that, when executed by the at least one processor 1140, cause the device 1105 to perform various functions described herein. The code 1135 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1135 may not be directly executable by the at least one processor 1140 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1130 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0171] The at least one processor 1140 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1140 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 1140. The at least one processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 1130) to cause the device 1105 to perform various functions (e.g., functions or tasks supporting occasion-level linkage between an SRS and CSI-RSs for a CJT phase report) . For example, the device 1105 or a component of the device 1105 may include at least one processor 1140 and at least one memory 1130 coupled with or to the at least one processor 1140, the at least one processor 1140 and the at least one memory 1130 configured to perform various functions described herein.
[0172] In some examples, the at least one processor 1140 may include multiple processors and the at least one memory 1130 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 1140 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 1140) and memory circuitry (which may include the at least one memory 1130) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1140 or a processing system including the at least one processor 1140 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 1135 (e.g., processor-executable code) stored in the at least one memory 1130 or otherwise, to perform one or more of the functions described herein.
[0173] 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, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. The communications manager 1120 is capable of, configured to, or operable to support a means for receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The communications manager 1120 is capable of, configured to, or operable to support a means for transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points.
[0174] 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, reduced power consumption, more efficient utilization of communication resources, improved coordination between devices, longer battery life, and improved utilization of processing capability.
[0175] In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 1115, the one or more antennas 1125, or any combination thereof. For example, the communications manager 1120 may be configured to receive or transmit messages or other signaling as described herein via the transceiver 1115. 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 at least one processor 1140, the at least one memory 1130, the code 1135, or any combination thereof. For example, the code 1135 may include instructions executable by the at least one processor 1140 to cause the device 1105 to perform various aspects of occasion-level linkage between an SRS and CSI-RSs for a CJT phase report as described herein, or the at least one processor 1140 and the at least one memory 1130 may be otherwise configured to, individually or collectively, perform or support such operations.
[0176] FIG. 12 shows a flowchart illustrating a method 1200 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more 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 11. 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.
[0177] At 1205, the method may include transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. The operations of 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by an SRS transmission component 1025 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1205 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0178] At 1210, the method may include receiving, via respective occasions of a set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The operations of 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by a CSI-RS reception component 1030 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1210 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0179] At 1215, the method may include transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points. The operations of 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by a measurement reporting component 1035 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1215 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0180] FIG. 13 shows a flowchart illustrating a method 1300 that supports occasion-level linkage between an SRS and CSI-RSs for a CJT phase report in accordance with one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE or its components as described herein. For example, the operations of the method 1300 may be performed by a UE 115 as described with reference to FIGs. 1 through 11. 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.
[0181] At 1305, the method may include transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE. The operations of 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by an SRS transmission component 1025 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1305 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0182] At 1310, the method may include receiving a request for a measurement report, where the request indicates respective occasions of a set of multiple CSI-RS resources via which the UE is to measure at least one phase offset. The operations of 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a measurement reporting component 1035 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1310 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0183] At 1315, the method may include receiving, via the respective occasions of the set of multiple CSI-RS resources associated with a set of multiple transmission and reception points, a set of multiple CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources, where the linkage is based on a timing relationship between the occasion of the SRS resource and the respective occasions of the set of multiple CSI-RS resources. The operations of 1315 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by a CSI-RS reception component 1030 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1315 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0184] At 1320, the method may include transmitting the measurement report in association with transmitting the SRS port using the first antenna port and receiving the set of multiple CSI-RSs using the first antenna port, where the measurement report includes information pertaining to the at least one phase offset between at least two transmission and reception points of the set of multiple transmission and reception points. The operations of 1320 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1320 may be performed by a measurement reporting component 1035 as described with reference to FIG. 10. Additionally, or alternatively, means for performing 1320 may, but not necessarily, include, for example, one or more antennas 1125, a transceiver 1115, a communications manager 1120, at least one memory 1130 (including code 1135) , at least one processor 1140, and / or a bus 1145.
[0185] The following provides an overview of aspects of the present disclosure:
[0186] Aspect 1: A method for wireless communications at a UE, comprising: transmitting, via an occasion of an SRS resource, an SRS port using a first antenna port of the UE; receiving, via respective occasions of a plurality of CSI-RS resources associated with a plurality of TRPs, a plurality of CSI-RSs using the first antenna port of the UE in accordance with a linkage between the occasion of the SRS resource and the respective occasions of the plurality of CSI-RS resources, wherein the linkage is based at least in part on a timing relationship between the occasion of the SRS resource and the respective occasions of the plurality of CSI-RS resources; and transmitting a measurement report in association with transmitting the SRS port using the first antenna port and receiving the plurality of CSI-RSs using the first antenna port, wherein the measurement report comprises information pertaining to at least one phase offset between at least two TRPs of the plurality of TRPs.
[0187] Aspect 2: The method of aspect 1, further comprising: receiving a request for the measurement report, wherein the request indicates the respective occasions of the plurality of CSI-RS resources via which the UE is to measure the at least one phase offset, and wherein transmitting the measurement report is further in association with receiving the request.
[0188] Aspect 3: The method of any of aspects 1–2, further comprising: receiving a first DCI message that triggers the occasion of the SRS resource; and receiving a second DCI message that triggers the respective occasions of the plurality of CSI-RS resources, wherein the timing relationship comprises the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the plurality of CSI-RS resources.
[0189] Aspect 4: The method of any of aspects 1–3, further comprising: receiving a single DCI message that triggers the occasion of the SRS resource and also triggers the respective occasions of the plurality of CSI-RS resources, wherein the timing relationship comprises the occasion of the SRS resource and the respective occasions of the plurality of CSI-RS resources both being triggered by the single DCI message.
[0190] Aspect 5: The method of any of aspects 1–4, further comprising: receiving an RRC message or a MAC-CE that configures or activates the SRS resource; and receiving a DCI message that triggers the respective occasions of the plurality of CSI-RS resources, wherein the timing relationship comprises the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the plurality of CSI-RS resources.
[0191] Aspect 6: The method of any of aspects 1–5, further comprising: receiving an RRC message or a MAC-CE that configures or activates the SRS resource; and receiving a DCI message that triggers the respective occasions of the plurality of CSI- RS resources, wherein the timing relationship comprises the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the plurality of CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the plurality of CSI-RS resources.
[0192] Aspect 7: The method of any of aspects 1–6, further comprising: receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource; and receiving a second RRC message or a second MAC-CE that configures or activates the plurality of CSI-RS resources, wherein the timing relationship comprises the occasion of the SRS resource being, within a time domain, a nearest occasion of the SRS resource to the respective occasions of the plurality of CSI-RS resources.
[0193] Aspect 8: The method of any of aspects 1–7, further comprising: receiving a first RRC message or a first MAC-CE that configures or activates the SRS resource; and receiving a second RRC message or a second MAC-CE that configures or activates the plurality of CSI-RS resources, wherein the timing relationship comprises the occasion of the SRS resource being a most recent occasion of the SRS resource prior to the respective occasions of the plurality of CSI-RS resources and being at least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the plurality of CSI-RS resources.
[0194] Aspect 9: The method of any of aspects 1–8, wherein the SRS resource is a periodic or semi-persistent SRS resource, and the UE transmits the measurement report comprising a valid phase offset quantization codepoint based at least in part on the respective occasions of the plurality of CSI-RS resources being prior to a channel state information reference resource or the occasion of the SRS resource being prior to the channel state information reference resource.
[0195] Aspect 10: The method of aspect 9, wherein the UE transmits the measurement report in accordance with a channel state information report configuration, a serving cell activation, a bandwidth part change, an activation of a semi-persistent CSI-RS resource, or within DRX active time.
[0196] Aspect 11: The method of any of aspects 1–10, wherein to transmit the measurement report, the UE disregards a time restriction for a channel measurement parameter pertaining to the measurement report.
[0197] Aspect 12: The method of any of aspects 1–11, wherein each TRP of the plurality of TRPs is associated with a respective CSI-RS resource of the plurality of CSI-RS resources; the plurality of CSI-RS resources is located within a threshold time duration and without downlink or uplink switching in between the plurality of CSI-RS resources; and the UE receives, from each TRP of the plurality of TRPs, a respective CSI-RS of the plurality of CSI-RSs via a respective occasion of the respective CSI-RS resource associated with that TRP.
[0198] Aspect 13: The method of any of aspects 1–12, wherein the measurement report is an aperiodic measurement report, and both the measurement report and the respective occasions of the plurality of CSI-RS resources are associated with the occasion of the SRS resource.
[0199] Aspect 14: The method of any of aspects 1–13, wherein the plurality of CSI-RS resources is a plurality of aperiodic or semi-persistent CSI-RS resources, and each CSI-RS resource of the plurality of CSI-RS resources is associated with a same periodicity.
[0200] Aspect 15: The method of aspect 14, wherein the SRS resource is a periodic or semi-persistent SRS resource, and the SRS resource is associated with the same periodicity as the plurality of CSI-RS resources.
[0201] Aspect 16: A UE for wireless communications, comprising one or more memories storing processor-executable code, a transceiver, and one or more processors coupled with the one or more memories and the transceiver and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1–15.
[0202] Aspect 17: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1–15.
[0203] Aspect 18: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1–15.
[0204] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0205] 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.
[0206] 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.
[0207] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0208] 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.
[0209] 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.
[0210] 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. ”
[0211] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0212] 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.
[0213] 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.
[0214] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0215] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:one or more memories storing processor-executable code;a transceiver; andone or more processors coupled with the one or more memories and the transceiver, the one or more processors individually or collectively operable to execute the code to cause the UE to:transmit, via the transceiver and via an occasion of a sounding reference signal resource, a sounding reference signal port using a first antenna port of the UE;receive, via the transceiver and via respective occasions of a plurality of channel state information reference signal resources associated with a plurality of transmission and reception points, a plurality of channel state information reference signals using the first antenna port of the UE in accordance with a linkage between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources, wherein the linkage is based at least in part on a timing relationship between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources; andtransmit, via the transceiver, a measurement report in association with transmitting the sounding reference signal port using the first antenna port and receiving the plurality of channel state information reference signals using the first antenna port, wherein the measurement report comprises information pertaining to at least one phase offset between at least two transmission and reception points of the plurality of transmission and reception points.2.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a request for the measurement report, wherein the request indicates the respective occasions of the plurality of channel state information reference signal resources via which the UE is to measure the at least one phase offset, and wherein the one or more processors are individually or collectively operable to execute the code to cause the UE to transmit the measurement report further in association with receiving the request.3.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a first downlink control information message that triggers the occasion of the sounding reference signal resource; andreceive, via the transceiver, a second downlink control information message that triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being a most recent occasion of the sounding reference signal resource prior to the respective occasions of the plurality of channel state information reference signal resources.4.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a single downlink control information message that triggers the occasion of the sounding reference signal resource and also triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources both being triggered by the single downlink control information message.5.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a radio resource control message or a medium access control (MAC) control element that configures or activates the sounding reference signal resource; andreceive, via the transceiver, a downlink control information message that triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being, within a time domain, a nearest occasion of the sounding reference signal resource to the respective occasions of the plurality of channel state information reference signal resources.6.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a radio resource control message or a medium access control (MAC) control element that configures or activates the sounding reference signal resource; andreceive, via the transceiver, a downlink control information message that triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being:a most recent occasion of the sounding reference signal resource prior to the respective occasions of the plurality of channel state information reference signal resources, andat least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the plurality of channel state information reference signal resources.7.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a first radio resource control message or a first medium access control (MAC) control element that configures or activates the sounding reference signal resource; andreceive, via the transceiver, a second radio resource control message or a second MAC control element that configures or activates the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being, within a time domain, a nearest occasion of the sounding reference signal resource to the respective occasions of the plurality of channel state information reference signal resources.8.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the transceiver, a first radio resource control message or a first medium access control (MAC) control element that configures or activates the sounding reference signal resource; andreceive, via the transceiver, a second radio resource control message or a second MAC control element that configures or activates the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being:a most recent occasion of the sounding reference signal resource prior to the respective occasions of the plurality of channel state information reference signal resources, andat least a time gap prior to an initial symbol of an earliest occasion from among the respective occasions of the plurality of channel state information reference signal resources.9.The UE of claim 1, wherein:the sounding reference signal resource is a periodic or semi-persistent sounding reference signal resource, andthe one or more processors are individually or collectively operable to execute the code to cause the UE to transmit the measurement report comprising a valid phase offset quantization codepoint based at least in part on the respective occasions of the plurality of channel state information reference signal resources being prior to a channel state information reference resource or the occasion of the sounding reference signal resource being prior to the channel state information reference resource.10.The UE of claim 9, wherein the one or more processors are individually or collectively operable to execute the code to cause the UE to transmit the measurement report in accordance with a channel state information report configuration, a serving cell activation, a bandwidth part change, an activation of a semi-persistent channel state information reference signal resource, or within a discontinuous reception (DRX) active time.11.The UE of claim 1, wherein to transmit the measurement report, the one or more processors are individually or collectively operable to execute the code to cause the UE to disregard a time restriction for a channel measurement parameter pertaining to the measurement report.12.A method for wireless communications at a user equipment (UE) , comprising:transmitting, via an occasion of a sounding reference signal resource, a sounding reference signal port using a first antenna port of the UE;receiving, via respective occasions of a plurality of channel state information reference signal resources associated with a plurality of transmission and reception points, a plurality of channel state information reference signals using the first antenna port of the UE in accordance with a linkage between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources, wherein the linkage is based at least in part on a timing relationship between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources; andtransmitting a measurement report in association with transmitting the sounding reference signal port using the first antenna port and receiving the plurality of channel state information reference signals using the first antenna port, wherein the measurement report comprises information pertaining to at least one phase offset between at least two transmission and reception points of the plurality of transmission and reception points.13.The method of claim 12, further comprising:receiving a request for the measurement report, wherein the request indicates the respective occasions of the plurality of channel state information reference signal resources via which the UE is to measure the at least one phase offset, andwherein transmitting the measurement report is further in association with receiving the request.14.The method of claim 12, further comprising:receiving a first downlink control information message that triggers the occasion of the sounding reference signal resource; andreceiving a second downlink control information message that triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource being a most recent occasion of the sounding reference signal resource prior to the respective occasions of the plurality of channel state information reference signal resources.15.The method of claim 12, further comprising:receiving a single downlink control information message that triggers the occasion of the sounding reference signal resource and also triggers the respective occasions of the plurality of channel state information reference signal resources,wherein the timing relationship comprises the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources both being triggered by the single downlink control information message.16.The method of claim 12, wherein:each transmission and reception point of the plurality of transmission and reception points is associated with a respective channel state information reference signal resource of the plurality of channel state information reference signal resources, and the plurality of channel state information reference signal resources is located within a threshold time duration and without downlink or uplink switching in between the plurality of channel state information reference signal resources; andthe UE receives, from each transmission and reception point of the plurality of transmission and reception points, a respective channel state information reference signal of the plurality of channel state information reference signals via a respective occasion of the respective channel state information reference signal resource associated with that transmission and reception point.17.The method of claim 12, wherein:the measurement report is an aperiodic measurement report, andboth the measurement report and the respective occasions of the plurality of channel state information reference signal resources are associated with the occasion of the sounding reference signal resource.18.The method of claim 12, wherein:the plurality of channel state information reference signal resources is a plurality of aperiodic or semi-persistent channel state information reference signal resources, andeach channel state information reference signal resource of the plurality of channel state information reference signal resources is associated with a same periodicity.19.The method of claim 18, wherein:the sounding reference signal resource is a periodic or semi-persistent sounding reference signal resource, andthe sounding reference signal resource is associated with the same periodicity as the plurality of channel state information reference signal resources.20.A user equipment (UE) for wireless communications, comprising:means for transmitting, via an occasion of a sounding reference signal resource, a sounding reference signal port using a first antenna port of the UE;means for receiving, via respective occasions of a plurality of channel state information reference signal resources associated with a plurality of transmission and reception points, a plurality of channel state information reference signals using the first antenna port of the UE in accordance with a linkage between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources, wherein the linkage is based at least in part on a timing relationship between the occasion of the sounding reference signal resource and the respective occasions of the plurality of channel state information reference signal resources; andmeans for transmitting a measurement report in association with transmitting the sounding reference signal port using the first antenna port and receiving the plurality of channel state information reference signals using the first antenna port, wherein the measurement report comprises information pertaining to at least one phase offset between at least two transmission and reception points of the plurality of transmission and reception points.
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