Techniques for channel state information buffering
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-08-13
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Figure CN2025075925_13082026_PF_FP_ABST
Abstract
Description
TECHNIQUES FOR CHANNEL STATE INFORMATION BUFFERINGFIELD OF TECHNOLOGY
[0001] The following relates to wireless communications, including techniques for channel state information (CSI) buffering.BACKGROUND
[0002] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .SUMMARY
[0003] 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.
[0004] A method for wireless communications by a user equipment (UE) is described. The method may include receiving control signaling that indicates a first set of parameters for transmission of a first channel state information (CSI) report and a second set of parameters for transmission of a second CSI report, generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE, generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report, and transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0005] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to receive control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report, generate, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE, generate, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report, and transmit either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0006] Another UE for wireless communications is described. The UE may include means for receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report, means for generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE, means for generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report, and means for transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0007] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report, generate, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE, generate, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report, and transmit either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0008] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for removing the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold and storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0009] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for removing the one or more first CSI metrics from the buffer based on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that may be lower than a second priority of the second CSI report and storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0010] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for removing the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold and on the first CSI report having a first priority that may be higher than a second priority of the second CSI report and storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0011] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for reducing a first priority of the first CSI report based on the buffer duration satisfying a second threshold, where transmitting either the first CSI report or the second CSI report may be based on the first priority of the first CSI report and a second priority of the second CSI report.
[0012] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the buffer duration begins at a start time of generating the one or more first CSI metrics using the first CSI processing unit.
[0013] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the buffer duration begins after a maximum processing time associated generating the one or more first CSI metrics using the first CSI processing unit.
[0014] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the buffer duration begins after a minimum processing time associated generating the one or more first CSI metrics using the first CSI processing unit.
[0015] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting either the first CSI report or the second CSI report may include operations, features, means, or instructions for transmitting the first CSI report based on the buffer duration being active during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, where the quantity of symbols may be based on a layer 1 processing time associated with communicating the first CSI report.
[0016] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for removing the one or more first CSI metrics from the buffer based on the buffer duration being inactive during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, where the quantity of symbols may be based on a layer 1 processing time associated with communicating the first CSI report, and where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on removing the one or more first CSI metrics from the buffer.
[0017] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the second CSI report includes one or more third CSI metrics different than the one or more second CSI metrics, the one or more third CSI metrics being generated in accordance with a dummy CSI format.
[0018] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting either the first CSI report or the second CSI report may include operations, features, means, or instructions for transmitting the first CSI report prior to the buffer duration satisfying the threshold and storing the one or more second CSI metrics to the buffer based on transmitting the first CSI report.
[0019] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting an indication of a capability of the UE, where the capability may be associated with a maximum quantity of CSI metrics supported by the buffer, and where the maximum quantity may be based on one or more reference parameters associated with a reference CSI report configuration.
[0020] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a total quantity of a set of multiple CSI metrics associated with the first CSI report may be greater than an available quantity of CSI metrics supported by the buffer and the one or more first CSI metrics stored to the buffer includes a subset of CSI metrics of the set of multiple CSI metrics based on the total quantity being greater than the available quantity of CSI metrics.
[0021] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a total quantity of a set of multiple CSI metrics associated with the first CSI report may be greater than an available quantity of CSI metrics supported by the buffer and the one or more first CSI metrics stored to the buffer may be associated with a lower rank than a rank indicated by the first set of parameters based on the total quantity being greater than the available quantity of CSI metrics.
[0022] 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
[0023] FIG. 1 shows an example of a wireless communications system that supports techniques for channel state information (CSI) buffering in accordance with one or more aspects of the present disclosure.
[0024] FIG. 2 shows an example of a wireless communications system that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0025] FIG. 3 shows examples of timing diagrams that support techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0026] FIG. 4 shows an example of a timing diagram that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0027] FIG. 5 shows an example of a process flow that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0028] FIGs. 6 and 7 show block diagrams of devices that support techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0029] FIG. 8 shows a block diagram of a communications manager that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0030] FIG. 9 shows a diagram of a system including a device that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure.
[0031] FIGs. 10 through 12 show flowcharts illustrating methods that support techniques for CSI buffering in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0032] In some wireless communications systems, a user equipment (UE) may receive and measure one or more reference signals to generate channel state information (CSI) metrics for estimating a wireless channel quality (e.g., channel quality indicator (CQI) , rank indicator (RI) , precoding matrix indicator (PMI) , signal-to-interference-plus-noise ratio (SINR) , reference signal received power (RSRP) , and other examples) . The UE may transmit these generated CSI metrics to a network entity via a CSI report. Various aspects of the CSI report may be configured by the network such as a type of CSI report (e.g., periodic-CSI (P-CSI) , semi-persistent-CSI (SP-CSI) , aperiodic-CSI (A-CSI) ) , resources for transmitting the CSI report, and a periodicity for the CSI report. In some cases, the UE may support active CSI-reference signal (CSI-RS) resource / ports counting (ARC) mechanisms to determine (e.g., count) a quantity of active CSI-RS resources.
[0033] The UE may also include one or more CSI processing units (CPUs) , which may perform respective CSI processing for a given CSI process (e.g., receiving CSI-RS signal (s) via a set of CSI-RS ports and calculating a set of corresponding CSI measurements) . However, some methods for determining an occupation of CSI-RS resources (e.g., across ARC and CPU mechanisms) may be inconsistent and inefficient. For instance, CPU occupation time (e.g., a time during which the CPU unavailable for subsequent CSI processing) may be defined differently for ARC and CPU mechanisms, which may result in underutilization of UE CSI processing capability. That is, the UE may determine that a periodic CSI-RS resource for CSI reporting is active in a duration even when the CPU for the CSI reporting is not in active use. Further, if the UE enables the CPUs to become available more often, the UE may not support mechanisms to manage concurrent CSI processing.
[0034] In accordance with one or more aspects described herein, the UE may be enabled to implement CSI buffer mechanisms to improve CSI processing efficiency. For example, after measuring a CSI-RS and generating the corresponding CSI metric (s) using a CPU, the UE may buffer (e.g., store, log, hold) the CSI metric (s) . As such, the UE may free the CPU for subsequent CSI processing (e.g., for another CSI process) . In some examples, the UE may share one or more CSI buffers across multiple CSI processes. Additionally, or alternatively, the UE may support various CSI buffer timing mechanisms as described herein. For example, the UE may utilize a buffer duration (e.g., a threshold) , a CSI report priority, or both to determine a duration that a set of CSI metrics is maintained in the CSI buffer.
[0035] In some examples, the UE may determine when a buffer duration begins based on (e.g., relative to) a start of a CSI processing time (e.g., in terms of a quantity of symbols) . In some examples, the UE may determine (e.g., based on the buffer duration) one or more conditions under which one or more buffered CSI metric are to be reported or removed (e.g., dropped, flushed) from the buffer. In some examples, the UE may indicate a buffer capability to the network and may support techniques for buffering CSI metrics when a given set of CSI report metrics exceed the buffer capability. Accordingly, by applying one or more techniques described herein, the UE may support more-efficient use of the CPUs with relatively low impact to processing complexity. As such, the UE may improve its CSI processing capability thereby supporting reduced latency, improved spectral efficiency, and improved communication reliability, among other benefits.
[0036] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to timing diagrams, process flows, apparatus diagrams, system diagrams, and flowcharts that relate to techniques for CSI buffering.
[0037] FIG. 1 shows an example of a wireless communications system 100 that supports techniques for CSI buffering 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.
[0038] 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) .
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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) .
[0043] 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) ) .
[0044] 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.
[0045] 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.
[0046] For instance, an access network (AN) or RAN may include communications between access nodes (e.g., an IAB donor) , IAB node (s) 104, and one or more UEs 115. The IAB donor may facilitate connection between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130) . That is, an IAB donor may refer to a RAN node with a wired or wireless connection to the core network 130. The IAB donor may include one or more of a CU 160, a DU 165, and an RU 170, in which case the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link) . The IAB donor and IAB node (s) 104 may communicate via an F1 interface according to a protocol that defines signaling messages (e.g., an F1 AP protocol) . Additionally, or alternatively, the CU 160 may communicate with the core network 130 via an interface, which may be an example of a portion of a backhaul link, and may communicate with other CUs (e.g., including a CU 160 associated with an alternative IAB donor) via an Xn-C interface, which may be an example of another portion of a backhaul link.
[0047] IAB node (s) 104 may refer to RAN nodes that provide IAB functionality (e.g., access for UEs 115, wireless self-backhauling capabilities) . A DU 165 may act as a distributed scheduling node towards child nodes associated with the IAB node (s) 104, and the IAB-MT may act as a scheduled node towards parent nodes associated with IAB node (s) 104. That is, an IAB donor may be referred to as a parent node in communication with one or more child nodes (e.g., an IAB donor may relay transmissions for UEs through other IAB node (s) 104) . Additionally, or alternatively, IAB node (s) 104 may also be referred to as parent nodes or child nodes to other IAB node (s) 104, depending on the relay chain or configuration of the AN. The IAB-MT entity of IAB node (s) 104 may provide a Uu interface for a child IAB node (e.g., the IAB node (s) 104) to receive signaling from a parent IAB node (e.g., the IAB node (s) 104) , and a DU interface (e.g., a DU 165) may provide a Uu interface for a parent IAB node to signal to a child IAB node or UE 115.
[0048] For example, IAB node (s) 104 may be referred to as parent nodes that support communications for child IAB nodes, or may be referred to as child IAB nodes associated with IAB donors, or both. An IAB donor may include a CU 160 with a wired or wireless connection (e.g., backhaul communication link (s) 120) to the core network 130 and may act as a parent node to IAB node (s) 104. For example, the DU 165 of an IAB donor may relay transmissions to UEs 115 through IAB node (s) 104, or may directly signal transmissions to a UE 115, or both. The CU 160 of the IAB donor may signal communication link establishment via an F1 interface to IAB node (s) 104, and the IAB node (s) 104 may schedule transmissions (e.g., transmissions to the UEs 115 relayed from the IAB donor) through one or more DUs (e.g., DUs 165) . That is, data may be relayed to and from IAB node (s) 104 via signaling via an NR Uu interface to MT of IAB node (s) 104 (e.g., other IAB node (s) ) . Communications with IAB node (s) 104 may be scheduled by a DU 165 of the IAB donor or of IAB node (s) 104.
[0049] 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 techniques for CSI buffering 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) .
[0050] 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.
[0051] 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.
[0052] 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) .
[0053] In some examples, such as in a carrier aggregation configuration, a carrier may have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) ) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different RAT) .
[0054] The communication link (s) 125 of the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
[0055] A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular RAT (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
[0056] 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.
[0057] One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
[0058] 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) .
[0059] 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.
[0060] 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) ) .
[0061] 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) .
[0062] 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.
[0063] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a network entity 105 operating with lower power (e.g., a base station 140 operating with lower power) relative to a macro cell, and a small cell may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A network entity 105 may support one or more cells and may also support communications via the one or more cells using one or multiple component carriers.
[0064] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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.
[0069] 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.
[0070] 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.
[0071] The wireless communications system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz, also known as the centimeter band, or using an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the network entities 105 (e.g., base stations 140, RUs 170) , and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, such techniques may facilitate using antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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) .
[0076] A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.
[0077] Some signals, such as data signals associated with a particular receiving device, may be transmitted by a transmitting device (e.g., a network entity 105 or a UE 115) along a single beam direction (e.g., a direction associated with the receiving device, such as another network entity 105 or UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted along one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the network entity 105 along different directions and may report to the network entity 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
[0078] In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a CSI-RS) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .
[0079] A receiving device (e.g., a UE 115) may perform reception operations in accordance with multiple receive configurations (e.g., directional listening) when receiving various signals from a transmitting device (e.g., a network entity 105) , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may perform reception in accordance with multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
[0080] The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
[0081] In some cases, a UE 115 may receive and measure one or more CSI-RSs from a network entity 105 to determine (e.g., measure, identify, generate, calculate) one or more CSI metrics (e.g., CQI, RI, PMI, SINR, RSRP, CSI-RS resource indicator (CRI) , and the like) for inclusion in a CSI report. In some cases, the UE 115 may support ARC mechanisms (e.g., associated with CSI-RS measurement capability) and CPU mechanisms (e.g., associated with CSI processing capability) . However, some methods for determining an occupation of CSI-RS resources for ARC and CPU purposes may be inconsistent and inefficient. For instance, CPU occupation time may be defined differently for ARC and CPU mechanisms, resulting in underutilization of the UE 115 CSI processing capability. Further, if the CPUs are enabled to be available more often, processing complexity may increase, and the UE 115 may not support mechanisms to manage the increased complexity.
[0082] As described herein, the UE 115 may be enabled to implement CSI buffer mechanisms to improve CSI processing efficiency. For example, the UE 115 may include a CSI buffer, which may be configured to store one or more CSI metrics for a given CSI process. Additionally, or alternatively, the UE 115 may support various CSI buffer timing mechanisms as described herein. For example, the UE 115 may utilize a buffer duration (e.g., a threshold) and CSI report priority to determine a duration that a set of CSI metrics is maintained in the CSI buffer. In some examples, the UE 115 may determine when a buffer duration begins based on a CSI processing start time. In some examples, the UE 115 may determine one or more conditions for which one or more buffered CSI metric are reported or removed from the CSI buffer. In some examples, the UE 115 may indicate a buffer capability to a network entity 105 and may support techniques for buffering CSI metrics when a given set of CSI report metrics are greater than the buffer capability. Accordingly, the UE 115 may support more-efficient use of the CPUs with relatively low impact to processing complexity, thereby improving CSI processing efficiency, reducing latency, and improving communication reliability in the wireless communications system 100.
[0083] FIG. 2 shows an example of a wireless communication system 200 that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure. The wireless communications system 200 may implement or be implemented by aspects of the wireless communications system 100 as described with reference to FIG. 1. For example, the wireless communications system 200 may include a UE 115 and a network entity 105, which may be examples of corresponding devices as described with reference to FIG. 1. The network entity 105 may communicate with the UE 115 (e.g., or multiple UEs 115) within a coverage area 110 via a link 205 and a link 210. The link 205 and the link 210 may be examples of downlink communication interfaces, uplink communication interfaces, or other communication interfaces. Although a network entity 105 and a UE 115 are shown as example devices of the wireless communications system 200, the techniques herein may be applied by one or more other devices described herein, including with reference to FIG. 1. In some examples, the UE 115 and the network entity 105 may communicate one or more CSI-RSs 220 and one or more CSI reports 225 in accordance with a timeline 250 (e.g., which may include other signaling such as downlink control information (DCI) messages) .
[0084] In some cases, the UE 115 may support ARC mechanisms, which may be associated with a CSI-RS measurement capability of the UE 115. For instance, in any given slot, the UE 115 may be not expected to have more active CSI-RS ports or active CSI-RS resources (e.g., in active BWPs) than its reported capability (e.g., a quantity of simultaneous active resources or ports per component carrier (CC) and / or across all CCs) . The UE 115 may determine (e.g., count) whether a resource (e.g., non-zero power (NZP) CSI-RS resources) is active in a duration based on a type of CSI-RS.
[0085] For instance, for periodic CSI-RS, the active duration may start when the periodic CSI-RS is configured by higher layer signaling (e.g., RRC signaling) and may terminate when the periodic CSI-RS configuration is released (e.g., “always ON” during the configured duration) . For semi-persistent CSI-RS, the active duration may start from the end of when an activation command is applied and may terminate at the end of when a deactivation command is applied (e.g., “always ON” between the activation and deactivation commands) . For aperiodic CSI-RS, the active duration may start from the end of a physical downlink control channel (PDCCH) message containing a request (e.g., a CSI request) and may terminate at the end of the scheduled physical uplink shared channel (PUSCH) message containing the report (e.g., the CSI report) associated with this aperiodic CSI-RS. Moreover, if a CSI-RS resource is referred “N” times by one or more CSI report configuration settings, the CSI-RS resource and the CSI-RS ports within the CSI-RS resource may be counted N times (e.g., by the UE 115) .
[0086] The UE 115 may also support one or more CPUs 215 (e.g., CPU 215-a to CPU 215-n) , which may be associated with a CSI processing capability of the UE 115. In some cases, each CPU 215 may support a single CSI process at a time. A CSI process may include, for example, receiving one or more CSI-RSs 220 via one or more ports, performing one or more measurements based on the CSI-RSs 220, and generating one or more CSI metrics for a CSI report 225 based on the measurements. In some cases, the UE 115 may indicate a quantity of simultaneous CSI processes (e.g., CSI calculations, NCPU) supported in a CC and an aggregate limit across all CCs (e.g., when carrier aggregation is applied) .
[0087] If a quantity (e.g., N) of CSI processes (e.g., CSI reports) start to occupy respective CPUs 215 (e.g., where each CSI process n = 0, ..., N-1 corresponds to OCPU (n) ) on a same OFDM symbol on which a quantity of unoccupied CPUs 215 (e.g., NCPU –L) is less than a quantity of expected CPUs 215 (e.g., ) , the UE 115 may not update one or more requested CSI processes (e.g., N-M CSI reports) with a lowest priority (e.g., where 0 ≤ M ≤ N is the largest value such that is true) . That is, a CPU occupation (e.g., OCPU (n) ) may be based on a type of CSI metric (e.g., reportQuantity) and a quantity of CSI-RS resources in a CSI-RS resource set (e.g., different values may be specified for the quantity types of ‘none, ’ RSRP / SINR, CQI / PMI / RI, and other types) .
[0088] However, some mechanisms (e.g., such as CPU occupation time assumptions) at the UE 115 for ARC and CPUs 215 may be somewhat inconsistent and inefficient. For instance, with reference to the CSI timeline 250, a CPU occupation for P-CSI reporting based on periodic CSI-RS resources (e.g., associated with a CSI-RS periodicity 265) may be considered active during durations 255 (e.g., from the CSI-RS to the P-CSI reporting) . Additionally, a CPU occupation for A-CSI reporting based on periodic resources may be considered active during durations 260 (e.g., a duration of one CSI reporting, from the DCI to the A-CSI reporting) . However, periodic resources may be considered as “always ON” during the configured duration independent of the configuration periodicity. This may be due to ARC mechanisms that address non-causal CSI-RS before a CSI trigger, because the UE 115 may be expected to pre-process and buffer CSI on each CSI-RS occasion (e.g., preparing for a subsequent A-CSI reporting as requested, if any) . However, potential buffering considerations for ARC may cause the UE to underreport a large quantity of simultaneously active CSI-RS resources (e.g., and a low UE capability may, in turn, restrict the network operation) .
[0089] In some cases, a CPU 215 may include (e.g., may be defined as) resources for CSI processing. However, it may be unclear as to whether a CPU 215 includes CSI computation resources or buffering resources. Moreover, an industry standard may define CSI processing timeline expectations (e.g., Z and / or Z’ ) , and for a CSI report 225, a tradeoff for CSI processing between quantity of occupied CPUs 215 and processing timeline may be considered (e.g., concurrency versus latency) . In some cases, a CPU occupation time for A-CSI report with P-CSI-RS may be defined differently from ARC (e.g., from DCI to PUSCH) , and the inconsistency may cause the UE 115 to underutilize its CSI processing capability (e.g., when a same value reported for ARC capability and CPU capability) .
[0090] In some cases, to avoid under-reporting (e.g., conservative reporting) of CSI processing capability, a UE 115 may not consider (e.g., count) a periodic CSI-RS as “always active” (e.g., may limit the active duration to a threshold duration) . That is, processing of periodic CSI-RS may be similar to aperiodic CSI-RS (e.g., CPU 215 processing resources are occupied during the timeline of CSI reporting, and then may be released to other CSI-RSs during the inactive time) . However, if such periodic resources are not considered as “always active, ” the UE 115 may not support mechanisms to address non-causal CSI reporting (e.g., to properly handle the DCI for A-CSI report received during the inactive time of the associated CSI-RS) . In some cases, the UE 115 may support CSI buffering (e.g., storing precomputed CSI, or CSI metrics, into a buffer) , and a DCI message (e.g., for A-CSI reporting) may trigger UE to multiplex the buffered CSI on a scheduled PUSCH (e.g., include the buffered CSI as part of a CSI report 225 via PUSCH transmission) . In other words, the CSI measurement and the CSI reporting may be decoupled, where the CSI measurement may be automatically triggered by each received CSI-RS, and the reporting (e.g., multiplex CSI on a PUCCH / PUSCH (PUXCH) ) may be based on a trigger from the network entity 105.
[0091] In accordance with techniques described herein, the UE 115 may include one or more CSI buffers 230 (e.g., local memory, one or more registers) to support CSI buffering. In some examples, the UE 115 may indicate a quantity (e.g., a maximum quantity) of buffered CSI reports (e.g., or of buffered CSI metrics) support by the CSI buffer 230 via capability signaling (e.g., a capability indication 235) . The CSI buffer 230 may not be limited to one CSI process or CSI report 225 (e.g., to avoid a similar underutilization CSI processing capability) and may be dynamically shared across multiple CSI processes or multiple CSI reports 225. As such, the techniques described herein may enable an efficient implementation of dynamic CSI buffer sharing across multiple CSI reports 225 and support corresponding timeline designs.
[0092] In some examples, the UE 115 may receive one or more sets of parameters 240 (e.g., one or more CSI-ReportConfig parameters) , which may configure measurement of one or more CSI-RSs 220 and transmission of one or more CSI reports 225 (e.g., that include the corresponding CSI measurements) . Based on the parameters 240, the UE 115 may generate one or more corresponding CSI metrics (e.g., CSI measurement) using one or more CPUs 215. In some examples, each set of CSI metrics (e.g., each CSI report 225) may be buffered in the CSI buffer 230 for a threshold duration (e.g., a buffer duration, predefined, or indicated by the UE 115, using a buffer timer) .
[0093] In some examples, when the threshold duration is satisfied (e.g., the timer expires) , the CSI buffer 230 may be released for a subsequent CSI report 225 (e.g., for newly generated CSI reports) . That is, after the threshold is satisfied for a first CSI report 225, one or more CSI metrics for a second CSI report 225 may be stored to the CSI buffer 230 (e.g., and measurements for the first CSI report may be removed, flushed, or overwritten) . In some examples, for periodic CSI reporting, a newly generated CSI of a same CSI report configuration (e.g., at next period, in accordance with a periodicity 265) may automatically replace the previously buffered CSI. That is, in some examples, the buffer duration may be upper limited by a periodicity of the associated CSI-RS (e.g., the periodicity 265) .
[0094] Additionally, or alternatively, the UE 115 may determine a buffer duration associated with a given CSI report 225 (e.g., a duration during which CSI metrics of the CSI report 225 are stored in the CSI buffer 230) , which may be based on CSI report priority. The buffer duration may be compared to a threshold (e.g., a time value, which may be configured by the network entity 105 or the UE 115, or indicated by UE 115 or the network entity 105) . When a buffer duration fails to satisfy (e.g., is less than) the threshold, a higher priority CSI report 225 may flush out (e.g., remove, replace, overwrite) a lower priority CSI report 225 from the CSI buffer 230 (e.g., may cause the lower priority CSI measurements to be removed from the CSI buffer 230) . Alternatively, when the buffer duration satisfies the threshold (e.g., is equal to or larger than the time value) , a lower priority CSI report 225 may flush out a higher priority CSI report 225 from the CSI buffer 230.
[0095] In some examples, the threshold may be an infinite value (e.g., or set such that the threshold may not be satisfied) , and the buffered CSI report data may be flushed out by a new CSI report 225 of the same CSI report 225 or by another higher priority CSI report 225 (e.g., if there is a buffer limit) . In such examples, a higher priority CSI report 225 may not be flushed out by a lower priority CSI report 225. In some examples, a CSI priority definition may be based on a serving cell index, a reporting type (e.g., periodic or aperiodic) , an associated CSI reporting configuration index, or other parameters (e.g., including CSI priority as defined by 5G NR standards) . In some examples, when a priority of two or more CSI reports 225 is the same, the old CSI report 225 (e.g., the previously buffered CSI metrics) may be flushed out (e.g., if there is a buffer limit) .
[0096] In some examples, the UE 115 may utilize a priority updating (e.g., down-grading) mechanism. For example, for every “x” slots that one or more metrics of a given CSI report 225 are stored to the CSI buffer 230, the priority of the given CSI report 225 may be reduced (e.g., may decrement by one, for satisfying a time varying priority rule) . As such, data for CSI reports 225 that is stored to the CSI buffer 230 for relatively long durations may be associated with a relatively low priority (e.g., the priority may be inversely proportional to the buffer duration) . In some examples, a buffer duration (e.g., a buffer timer) may start (or restart) at each CSI-RS occasion when an associated CSI buffer timeline starts. Additional details related to a timeline of the CSI buffer 230 may be described in greater detail herein, including with reference to FIGs. 3 and 4.
[0097] In some examples, the UE 115 may indicate (e.g., to the network entity 105) a capability associated with the CSI buffer 230 via a capability indication 235. The capability indication 235 may include a capacity of the CSI buffer 230, such as a quantity (e.g., a maximum quantity) of buffered CSI reports 225 (e.g., of or buffered CSI metrics) supported by the CSI buffer 230. In some examples, the buffer capability of the UE 115 may be based on a reference CSI report configuration, which may include a reference CSI-RS port number, a codebook configuration, reporting bandwidth, and other parameters. In some examples, the CSI buffer capability may include one or more values per CC (e.g., a value in one CC) and / or an aggregated value across two or more CCs.
[0098] For a CSI report configuration, an expected capacity of the CSI buffer 230 (e.g., or expected quantity of CSI buffers 230) may be greater than or equal to a threshold (e.g., one) based on a comparison of a maximum CSI payload for the CSI report configuration and the reference configuration (e.g., a maximum CSI payload of the reference CSI report configuration) . In some examples, when an available capacity of the CSI buffer 230 is less than an expected capacity (e.g., an indicated CSI buffer capacity for a CSI report 225) , the UE 115 may buffer a subset (e.g., a portion) of CSI metrics for the CSI report 225 (e.g., in accordance with a CSI omission rule, such as dropping half of sub-band PMI values or CQI values) .
[0099] Additionally, or alternatively, when the available buffer capacity is less than expected, one or more relatively lower rank CSI metrics may be computed and buffered, and the rank may be selected such that a full set CSI metrics can be stored to the CSI buffer 230 (e.g., the available capacity, without puncturing) . In some examples, CSI buffering may be supported based on a type of CSI reporting. For example, the UE 115 may support CSI buffering for CSI reporting based on periodic CSI-RS and semi-persistent CSI-RS (e.g., and not for aperiodic CSI-RS) . In some examples, such as for AP CSI with aperiodic CSI-RS, computed CSI (e.g., generated CSI metrics) may be directly multiplexed on a PUSCH for transmission (e.g., and buffering may not be performed) .
[0100] Accordingly, by utilizing the CSI buffer 230 in accordance with techniques herein, the UE 115 may support more-efficient use of the CPUs 215. For example, the UE 115 may support mechanisms (e.g., rules, behaviors) to determine whether CSI report data is to be maintained or removed from the CSI buffer 230, enabling flexible use of the CSI buffer 230 across multiple (e.g., different) CSI processes. The CSI buffer 230 may further enable a CPU 215 to become available for subsequent CSI processing, which may increase an ability of the UE 115 to perform CSI measurements. Additionally, by transmitting the capability indication 235, the UE 115 may increase coordination with the network entity 105. As such, the wireless communications system 200 may support reduced latency, improved spectral efficiency, and improved communication reliability, among other benefits.
[0101] FIG. 3 show examples of timing diagrams 300 that support techniques for CSI buffering in accordance with one or more aspects of the present disclosure. In some examples, a UE 115, a network entity 105, or some other device described herein (e.g., including as described with reference to FIGs. 1 and 2) may support communications and / or operations in accordance with one or more of the timing diagrams 300. Each timing diagram 300 may include multiple durations 305 (e.g., slots, each including one or more symbols) that include resources for communicating (e.g., receiving, transmitting, obtaining, outputting) various signaling and other messages. For example, a UE 115 may receive a CSI-RS 220 via one or more first durations 305, receive PDCCH signaling 310 (e.g., a DCI message) via one or more second durations 305, transmit PUSCH signaling 315 (e.g., including CSI report data) via one or more third durations 305, and transmit PUCCH signaling 320 (e.g., including CSI report data) via one or more fourth durations 305.
[0102] The timing diagrams 300 may illustrate options for determining a start time for a buffer duration 325 (e.g., a CSI buffer duration) . The buffer duration 325 may be associated with a duration during which a set of CSI metrics (e.g., CSI measurements, CSI report data) is stored to a CSI buffer 230. In some examples, a starting time of the buffer duration 325 (e.g., for CSI buffering) may be based on a CSI processing duration 330 (e.g., a CSI processing time) . For example, the start time of a buffer duration 325 may be configured as a quantity of symbols (e.g., N) after a start of a CSI processing duration 330. In some examples, a CSI processing duration 330 may be defined as a first symbol of an earliest one of each CSI-RS or CSI interference measurement (CSI-IM) associated with a CSI report configuration.
[0103] In accordance with the example illustrated by the timing diagram 300-a, the quantity of symbols may be equal to zero (e.g., N = 0) . That is, the start time for the buffer duration 325 may be aligned with (e.g., in a time domain, the same as) the start time of the CSI processing duration 330. Additionally, or alternatively, in accordance with the example illustrated by the timing diagram 300-b, the quantity of symbols may be equal to a maximum CSI processing time (e.g., when an associated CSI-RS or CSI-IM are referred by multiple CSI reporting configurations) . That is, the buffer duration 325 may start after the corresponding CSI processing duration 330 is finished.
[0104] Additionally, or alternatively, in accordance with the example illustrated by the timing diagram 300-c, the quantity of symbols may be equal to a duration 335, which may be a minimum CSI processing time. In some examples, the duration 335 may be defined based on a reference NZP CSI-RS, a codebook configuration, or both. In some examples, a buffer duration 325-a, a CSI processing duration 330-a, and / or a duration 335-a (e.g., associated with a first CSI-RS 220) may respectively be the same as, or different than, a buffer duration 325-b, a CSI processing duration 330-b, and / or a duration 335-b (e.g., associated with a second CSI-RS 220) .
[0105] FIG. 4 shows an example of a timing diagram 400 that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure. In some examples, a UE 115, a network entity 105, or some other device described herein (e.g., including as described with reference to FIGs. 1 and 2) may support communications and / or operations in accordance with the timing diagram 400. The timing diagram 400 may include multiple durations 405 (e.g., durations 305, slots, each including one or more symbols) that include resources for communicating (e.g., receiving, transmitting, obtaining, outputting) various signaling and other messages. For example, a UE 115 may receive a CSI-RS 220 via one or more first durations 405 and may transmit PUXCH signaling 420 (e.g., uplink signaling, carrying CSI report data) via one or more second durations 405.
[0106] The timing diagram 400 may illustrate one or more options for transmission timing for communicating data stored to a CSI buffer 230 (e.g., for determining a time to report buffered CSI) . In some examples, the UE 115 may report the buffered CSI (e.g., one or more CSI metrics, CSI measurements, or other data stored to the CSI buffer 230) if a buffer duration 325 is active (e.g., the associated buffering timer is running) during a duration 410. The duration 410 may be associated with a quantity of symbols (e.g., K) before a first symbol of a PUXCH message that includes (e.g., carries) the CSI report. In some examples, the quantity of symbols (e.g., K) may denote a layer one (L1) processing time for multiplexing CSI on the PUXCH signaling 420. In some examples, a duration 410-a (e.g., associated with a first CSI-RS 220) may respectively be the same as, or different than, a duration 410-b (e.g., associated with a second CSI-RS 220) .
[0107] In some examples, when the buffer duration 325 is not active (e.g., the timer expires or is stopped by a higher priority CSI report) , the UE 115 may drop the CSI report (e.g., for PUCCH based CSI reporting, may remove the corresponding CSI data from the CSI buffer 230 without transmitting) . Additionally, or alternatively, the UE 115 may report a dummy CSI report (e.g., for PUSCH based CSI reporting) . In some examples, the “dummy” CSI report may be associated with a known (e.g., predefined) format (e.g., including all zeros or all ones, a vector with a predefined size) .
[0108] In some examples (e.g., for timer based CSI buffer sharing) , the UE 115 may release the CSI buffer 230 after CSI (e.g., the one or more CSI metrics) is reported and before the buffer duration 325 (e.g., the timer) expires. For example, when the buffer duration 325 ends after a start of a subsequent CSI-RS occasion or a subsequent CSI buffer timeline, the CSI buffer 230 (e.g., the buffer contents) may be released after CSI reporting (e.g., for periodic CSI reporting) . Additionally, or alternatively, the CSI buffer 230 (e.g., the buffer contents) may be released after CSI reporting based on a configuration from a network entity 105 or based on UE capability signaling (e.g., for aperiodic CSI reporting) .
[0109] FIG. 5 shows an example of a process flow 500 that supports techniques for CSI buffering in accordance with one or more aspects of the present disclosure. In some examples, the process flow 500 may implement aspects of the wireless communications system 100, the wireless communications system 200, the timing diagrams 300, and the timing diagram 400. The UE 115 and the network entity 105 of the process flow 500 may be examples of corresponding devices herein, including with reference to FIGs. 1 through 4. In the following description of the process flow 500, the operations between the UE 115 and the network entity 105 may be performed in a different order than the order shown, or other operations may be added or removed from the process flow 500. For example, some operations may also be left out of the process flow 500, 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 network entity 105 are shown performing the operations of the process flow 500, some aspects of some operations may also be performed by one or more other wireless or network devices.
[0110] At 505, the UE 115 may transmit an indication of a capability of the UE 115. In some examples, the capability may be associated with a maximum quantity of buffered CSI reports or buffered CSI metrics (e.g., reporting data for a CSI report 225) supported by a buffer (e.g., CSI buffer 230) . In some examples, the maximum quantity may be based on one or more reference parameters associated with a reference CSI report configuration.
[0111] At 510, the UE 115 may receive control signaling (e.g., RRC signaling, or some other signaling) that indicates a first set of parameters (e.g., parameters 240) for transmission of a first CSI report and a second set of parameters (e.g., parameters 240) for transmission of a second CSI report. In some examples, the first set of parameters and the second set of parameters may be received via a same message or via different messages. At 515, the UE 115 may receive one or more CSI-RSs (e.g., one or more CSI-RSs 220) , which may correspond to one or more CSI reports including the first CSI report and the second CSI report) . For example, the UE 115 may perform one or more measurements of the CSI-RSs to obtain (e.g., generate) one or more CSI metrics to be included in a CSI report.
[0112] At 520, the UE 115 may generate one or more CSI metrics for the first CSI report using a first CPU (e.g., a CPU 215) of the UE 115. In some examples, the one or more first CSI metrics may be stored to or in a buffer (e.g., CSI buffer 230) . In some examples, when a total quantity of CSI metrics associated with a CSI report is greater than an available quantity of CSI metrics (e.g., an available capacity) supported by the buffer, the one or more buffered CSI metrics may include a subset of CSI metrics (e.g., including a quantity that is less than the total quantity) . Alternatively, when the total quantity of CSI metrics is greater than an available quantity of CSI metrics supported by the buffer, the one or more buffered CSI metrics may be associated with a lower rank than a rank indicated by one or more CSI report configuration parameters.
[0113] In some examples, a buffer duration (e.g., a buffer duration 325) may begin at a start time of generating the one or more first CSI metrics using the first CPU. In some examples, the buffer duration may begin after a maximum processing time associated generating the one or more first CSI metrics using the first CPU. In some examples, the buffer duration may begin after a minimum processing time associated generating the one or more first CSI metrics using the first CPU.
[0114] In some examples, the UE 115 may generate one or more second CSI metrics for the second CSI report (e.g., using a second CPU of the UE 115) . For example, the UE 115 may receive one or more second CSI-RSs (e.g., during generation of the first CSI metrics) and may initiate CSI processing to generate the second CSI report based on receiving the second set of CSI-RSs.
[0115] At 525, the UE 115 may adjust one or more priorities for one or more CSI reports. For example, the UE 115 may reduce a priority of a CSI report based on a buffer duration satisfying a threshold. Accordingly, the CSI report priority may be used by the UE 115 to determine whether to stop a buffer duration associated with a given CSI report.
[0116] At 530, the UE 115 may remove the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold. Additionally, or alternatively, the UE 115 may remove the one or more first CSI metrics from the buffer based on the buffer duration failing to satisfy the threshold and / or on the first CSI report having a first priority that is lower than a second priority of the second CSI report. Additionally, or alternatively, the UE 115 may remove the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold and / or on the first CSI report having a first priority that is higher than a second priority of the second CSI report.
[0117] In some examples, the UE 115 may remove the one or more first CSI metrics from the buffer based on the buffer duration being inactive during a quantity of symbols prior to a first symbol of an uplink channel resource (e.g., PUSCH, PUCCH) configured for transmission of the first CSI report. In some examples, the quantity of symbols may be based on an L1 processing time associated with communicating the first CSI report. In some examples, the UE 115 may transmit one or more third CSI metrics generated in accordance with a dummy CSI format based on the buffer duration being inactive.
[0118] At 535, the UE 115 may store the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, and may transmit (e.g., at 540) the second CSI report based on storing the one or more second CSI metrics to the buffer. For example, the one or more second CSI metrics may replace (e.g., flush out, overwrite) the one or more first CSI metrics in accordance with various techniques herein. In some examples, the UE 115 may store the one or more second CSI metrics to the buffer based on transmission of the first CSI report
[0119] At 540, the UE 115 may transmit either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold. For example, the UE 115 may transmit the first CSI report based on the buffer duration being active during a quantity of symbols (e.g., based on an L1 processing time) prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report. Additionally, or alternatively, the UE 115 may transmit the first CSI report prior to the buffer duration satisfying the threshold. Alternatively, the UE 115 may transmit the second CSI report based on the buffer duration failing to satisfy a threshold and / or other factors as described herein (e.g., based on removing the one or more first CSI metrics, on storing the one or more second CSI metrics to the buffer, or both) .
[0120] FIG. 6 shows a block diagram 600 of a device 605 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605, or one or more components of the device 605 (e.g., the receiver 610, the transmitter 615, the communications manager 620) , 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) .
[0121] The receiver 610 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 techniques for channel state information buffering) . Information may be passed on to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.
[0122] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 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 techniques for channel state information buffering) . In some examples, the transmitter 615 may be co-located with a receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.
[0123] The communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be examples of means for performing various aspects of techniques for channel state information buffering as described herein. For example, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0124] In some examples, the communications manager 620, the receiver 610, the transmitter 615, 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, 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) .
[0125] Additionally, or alternatively, the communications manager 620, the receiver 610, the transmitter 615, 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 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a central processing unit, 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) .
[0126] In some examples, the communications manager 620 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated in combination with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.
[0127] The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 620 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The communications manager 620 is capable of, configured to, or operable to support a means for generating, using a first CPU of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. The communications manager 620 is capable of, configured to, or operable to support a means for generating, using a second CPU of the UE, one or more second CSI metrics for the second CSI report. The communications manager 620 is capable of, configured to, or operable to support a means for transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0128] By including or configuring the communications manager 620 in accordance with examples as described herein, the device 605 (e.g., at least one processor controlling or otherwise coupled with the receiver 610, the transmitter 615, the communications manager 620, or a combination thereof) may support techniques for reduced processing and more efficient utilization of communication resources, among other benefits.
[0129] FIG. 7 shows a block diagram 700 of a device 705 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a device 605 or a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0130] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for channel state information buffering) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.
[0131] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for channel state information buffering) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.
[0132] The device 705, or various components thereof, may be an example of means for performing various aspects of techniques for channel state information buffering as described herein. For example, the communications manager 720 may include a control signaling component 725, a CSI generation component 730, a CSI report component 735, or any combination thereof. The communications manager 720 may be an example of aspects of a communications manager 620 as described herein. In some examples, the communications manager 720, 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 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.
[0133] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. The control signaling component 725 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The CSI generation component 730 is capable of, configured to, or operable to support a means for generating, using a first CPU of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. The CSI generation component 730 is capable of, configured to, or operable to support a means for generating, using a second CPU of the UE, one or more second CSI metrics for the second CSI report. The CSI report component 735 is capable of, configured to, or operable to support a means for transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0134] FIG. 8 shows a block diagram 800 of a communications manager 820 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The communications manager 820 may be an example of aspects of a communications manager 620, a communications manager 720, or both, as described herein. The communications manager 820, or various components thereof, may be an example of means for performing various aspects of techniques for channel state information buffering as described herein. For example, the communications manager 820 may include a control signaling component 825, a CSI generation component 830, a CSI report component 835, a CSI buffer component 840, a CSI priority component 845, a capability component 850, 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) .
[0135] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The control signaling component 825 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The CSI generation component 830 is capable of, configured to, or operable to support a means for generating, using a first CPU of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. In some examples, the CSI generation component 830 is capable of, configured to, or operable to support a means for generating, using a second CPU of the UE, one or more second CSI metrics for the second CSI report. The CSI report component 835 is capable of, configured to, or operable to support a means for transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0136] In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for removing the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold. In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0137] In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for removing the one or more first CSI metrics from the buffer based on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that is lower than a second priority of the second CSI report. In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0138] In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for removing the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold and on the first CSI report having a first priority that is higher than a second priority of the second CSI report. In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer.
[0139] In some examples, the CSI priority component 845 is capable of, configured to, or operable to support a means for reducing a first priority of the first CSI report based on the buffer duration satisfying a second threshold, where transmitting either the first CSI report or the second CSI report is based on the first priority of the first CSI report and a second priority of the second CSI report.
[0140] In some examples, the buffer duration begins at a start time of generating the one or more first CSI metrics using the first CPU.
[0141] In some examples, the buffer duration begins after a maximum processing time associated generating the one or more first CSI metrics using the first CPU.
[0142] In some examples, the buffer duration begins after a minimum processing time associated generating the one or more first CSI metrics using the first CPU.
[0143] In some examples, to support transmitting either the first CSI report or the second CSI report, the CSI report component 835 is capable of, configured to, or operable to support a means for transmitting the first CSI report based on the buffer duration being active during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, where the quantity of symbols is based on a L1 processing time associated with communicating the first CSI report.
[0144] In some examples, the CSI buffer component 840 is capable of, configured to, or operable to support a means for removing the one or more first CSI metrics from the buffer based on the buffer duration being inactive during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, where the quantity of symbols is based on a layer 1 processing time associated with communicating the first CSI report, and where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on removing the one or more first CSI metrics from the buffer.
[0145] In some examples, the second CSI report includes one or more third CSI metrics different than the one or more second CSI metrics, the one or more third CSI metrics being generated in accordance with a dummy CSI format.
[0146] In some examples, to support transmitting either the first CSI report or the second CSI report, the CSI report component 835 is capable of, configured to, or operable to support a means for transmitting the first CSI report prior to the buffer duration satisfying the threshold. In some examples, to support transmitting either the first CSI report or the second CSI report, the CSI buffer component 840 is capable of, configured to, or operable to support a means for storing the one or more second CSI metrics to the buffer based on transmitting the first CSI report.
[0147] In some examples, the capability component 850 is capable of, configured to, or operable to support a means for transmitting an indication of a capability of the UE, where the capability is associated with a maximum quantity of CSI metrics supported by the buffer, and where the maximum quantity is based on one or more reference parameters associated with a reference CSI report configuration.
[0148] In some examples, a total quantity of a set of multiple CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer. In some examples, the one or more first CSI metrics stored to the buffer includes a subset of CSI metrics of the set of multiple CSI metrics based on the total quantity being greater than the available quantity of CSI metrics.
[0149] In some examples, a total quantity of a set of multiple CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer. In some examples, the one or more first CSI metrics stored to the buffer are associated with a lower rank than a rank indicated by the first set of parameters based on the total quantity being greater than the available quantity of CSI metrics.
[0150] FIG. 9 shows a diagram of a system 900 including a device 905 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 920, an input / output (I / O) controller, such as an I / O controller 910, a transceiver 915, one or more antennas 925, at least one memory 930, code 935, and at least one processor 940. 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 945) .
[0151] The I / O controller 910 may manage input and output signals for the device 905. The I / O controller 910 may also manage peripherals not integrated into the device 905. In some cases, the I / O controller 910 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 910 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 910 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 910 may be implemented as part of one or more processors, such as the at least one processor 940. In some cases, a user may interact with the device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.
[0152] In some cases, the device 905 may include a single antenna. However, in some other cases, the device 905 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bi-directionally via the one or more antennas 925 using wired or wireless links as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 915 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 925 for transmission, and to demodulate packets received from the one or more antennas 925. The transceiver 915, or the transceiver 915 and one or more antennas 925, may be an example of a transmitter 615, a transmitter 715, a receiver 610, a receiver 710, or any combination thereof or component thereof, as described herein.
[0153] The at least one memory 930 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 930 may store computer-readable, computer-executable, or processor-executable code, such as the code 935. The code 935 may include instructions that, when executed by the at least one processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 935 may not be directly executable by the at least one processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 930 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.
[0154] The at least one processor 940 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more central processing units, 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 940 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 940. The at least one processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting techniques for channel state information buffering) . For example, the device 905 or a component of the device 905 may include at least one processor 940 and at least one memory 930 coupled with or to the at least one processor 940, the at least one processor 940 and the at least one memory 930 configured to perform various functions described herein.
[0155] In some examples, the at least one processor 940 may include multiple processors and the at least one memory 930 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 940 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 940) and memory circuitry (which may include the at least one memory 930) ) , 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 940 or a processing system including the at least one processor 940 may be configured to, configurable to, or operable to cause the device 905 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 935 (e.g., processor-executable code) stored in the at least one memory 930 or otherwise, to perform one or more of the functions described herein.
[0156] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 920 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The communications manager 920 is capable of, configured to, or operable to support a means for generating, using a first CPU of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. The communications manager 920 is capable of, configured to, or operable to support a means for generating, using a second CPU of the UE, one or more second CSI metrics for the second CSI report. The communications manager 920 is capable of, configured to, or operable to support a means for transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0157] By including or configuring the communications manager 920 in accordance with examples as described herein, the device 905 may support techniques for improved communication reliability, reduced latency, improved user experience related to reduced processing, more efficient utilization of communication resources, improved coordination between devices, and improved utilization of processing capability, among other benefits.
[0158] In some examples, the communications manager 920 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 915, the one or more antennas 925, or any combination thereof. Although the communications manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 920 may be supported by or performed by the at least one processor 940, the at least one memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the at least one processor 940 to cause the device 905 to perform various aspects of techniques for channel state information buffering as described herein, or the at least one processor 940 and the at least one memory 930 may be otherwise configured to, individually or collectively, perform or support such operations.
[0159] FIG. 10 shows a flowchart illustrating a method 1000 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The operations of the method 1000 may be implemented by a UE or its components as described herein. For example, the operations of the method 1000 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. 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.
[0160] At 1005, the method may include receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The operations of 1005 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1005 may be performed by a control signaling component 825 as described with reference to FIG. 8.
[0161] At 1010, the method may include generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. The operations of 1010 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed by a CSI generation component 830 as described with reference to FIG. 8.
[0162] At 1015, the method may include generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report. The operations of 1015 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed by a CSI generation component 830 as described with reference to FIG. 8.
[0163] At 1020, the method may include transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold. The operations of 1020 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1020 may be performed by a CSI report component 835 as described with reference to FIG. 8.
[0164] FIG. 11 shows a flowchart illustrating a method 1100 that supports techniques for channel state information buffering in accordance with one or more aspects of the present disclosure. The operations of the method 1100 may be implemented by a UE or its components as described herein. For example, the operations of the method 1100 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. 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.
[0165] At 1105, the method may include receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The operations of 1105 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed by a control signaling component 825 as described with reference to FIG. 8.
[0166] At 1110, the method may include generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. The operations of 1110 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed by a CSI generation component 830 as described with reference to FIG. 8.
[0167] At 1115, the method may include removing the one or more first CSI metrics from the buffer based on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that is lower than a second priority of the second CSI report. The operations of 1115 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed by a CSI buffer component 840 as described with reference to FIG. 8.
[0168] At 1120, the method may include generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report. The operations of 1120 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1120 may be performed by a CSI generation component 830 as described with reference to FIG. 8.
[0169] At 1125, the method may include storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer. The operations of 1125 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1125 may be performed by a CSI buffer component 840 as described with reference to FIG. 8.
[0170] At 1130, the method may include transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold. The operations of 1130 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1130 may be performed by a CSI report component 835 as described with reference to FIG. 8.
[0171] FIG. 12 shows a flowchart illustrating a method 1200 that supports techniques for channel state information buffering 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 9. 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.
[0172] At 1205, the method may include receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report. The operations of 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a control signaling component 825 as described with reference to FIG. 8.
[0173] At 1210, the method may include generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, where the one or more first CSI metrics are stored in a buffer of the UE. 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 generation component 830 as described with reference to FIG. 8.
[0174] At 1215, the method may include removing the one or more first CSI metrics from the buffer based on the buffer duration satisfying the threshold and on the first CSI report having a first priority that is higher than a second priority of the second CSI report. 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 CSI buffer component 840 as described with reference to FIG. 8.
[0175] At 1220, the method may include generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report. The operations of 1220 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1220 may be performed by a CSI generation component 830 as described with reference to FIG. 8.
[0176] At 1225, the method may include storing the one or more second CSI metrics to the buffer based on removing the one or more first CSI metrics, where transmitting either the first CSI report or the second CSI report includes transmitting the second CSI report based on storing the one or more second CSI metrics to the buffer. The operations of 1225 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1225 may be performed by a CSI buffer component 840 as described with reference to FIG. 8.
[0177] At 1230, the method may include transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based on whether a buffer duration of the one or more first CSI metrics satisfies a threshold. The operations of 1230 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1230 may be performed by a CSI report component 835 as described with reference to FIG. 8.
[0178] The following provides an overview of aspects of the present disclosure:
[0179] Aspect 1: A method for wireless communications at a UE, comprising: receiving control signaling that indicates a first set of parameters for transmission of a first CSI report and a second set of parameters for transmission of a second CSI report; generating, using a first CPU of the UE, one or more first CSI metrics for the first CSI report, wherein the one or more first CSI metrics are stored in a buffer of the UE; generating, using a second CPU of the UE, one or more second CSI metrics for the second CSI report; and transmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based at least in part on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.
[0180] Aspect 2: The method of aspect 1, further comprising: removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold; and storing the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.
[0181] Aspect 3: The method of any of aspects 1 through 2, further comprising: removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that is lower than a second priority of the second CSI report; and storing the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.
[0182] Aspect 4: The method of any of aspects 1 through 3, further comprising: removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold and on the first CSI report having a first priority that is higher than a second priority of the second CSI report; and storing the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.
[0183] Aspect 5: The method of any of aspects 1 through 4, further comprising: reducing a first priority of the first CSI report based at least in part on the buffer duration satisfying a second threshold, wherein transmitting either the first CSI report or the second CSI report is based at least in part on the first priority of the first CSI report and a second priority of the second CSI report.
[0184] Aspect 6: The method of any of aspects 1 through 5, wherein the buffer duration begins at a start time of generating the one or more first CSI metrics using the first CPU.
[0185] Aspect 7: The method of any of aspects 1 through 5, wherein the buffer duration begins after a maximum processing time associated generating the one or more first CSI metrics using the first CPU.
[0186] Aspect 8: The method of any of aspects 1 through 5, wherein the buffer duration begins after a minimum processing time associated generating the one or more first CSI metrics using the first CPU.
[0187] Aspect 9: The method of any of aspects 1 through 8, wherein transmitting either the first CSI report or the second CSI report comprises: transmitting the first CSI report based at least in part on the buffer duration being active during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, wherein the quantity of symbols is based at least in part on an L1 processing time associated with communicating the first CSI report.
[0188] Aspect 10: The method of any of aspects 1 through 9, further comprising: removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration being inactive during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, wherein the quantity of symbols is based at least in part on an L1 processing time associated with communicating the first CSI report, and wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on removing the one or more first CSI metrics from the buffer.
[0189] Aspect 11: The method of aspect 10, wherein the second CSI report comprises one or more third CSI metrics different than the one or more second CSI metrics, the one or more third CSI metrics being generated in accordance with a dummy CSI format.
[0190] Aspect 12: The method of any of aspects 1 through 11, wherein transmitting either the first CSI report or the second CSI report comprises: transmitting the first CSI report prior to the buffer duration satisfying the threshold; and storing the one or more second CSI metrics to the buffer based at least in part on transmitting the first CSI report.
[0191] Aspect 13: The method of any of aspects 1 through 12, further comprising: transmitting an indication of a capability of the UE, wherein the capability is associated with a maximum quantity of CSI metrics supported by the buffer, and wherein the maximum quantity is based at least in part on one or more reference parameters associated with a reference CSI report configuration.
[0192] Aspect 14: The method of aspect 13, wherein a total quantity of a plurality of CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer, and the one or more first CSI metrics stored to the buffer comprises a subset of CSI metrics of the plurality of CSI metrics based at least in part on the total quantity being greater than the available quantity of CSI metrics.
[0193] Aspect 15: The method of any of aspects 13 through 14, wherein a total quantity of a plurality of CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer, and the one or more first CSI metrics stored to the buffer are associated with a lower rank than a rank indicated by the first set of parameters based at least in part on the total quantity being greater than the available quantity of CSI metrics.
[0194] Aspect 16: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 15.
[0195] Aspect 17: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 15.
[0196] 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 through 15.
[0197] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0198] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
[0199] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0200] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a central processing unit, a graphics processing unit (GPU) , a neural processing unit (NPU) , an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0201] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0202] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0203] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0204] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0205] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0206] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0207] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0208] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:receive control signaling that indicates a first set of parameters for transmission of a first channel state information (CSI) report and a second set of parameters for transmission of a second CSI report;generate, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, wherein the one or more first CSI metrics are stored in a buffer of the UE;generate, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report; andtransmit either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based at least in part on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.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:remove the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold; andstore the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.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:remove the one or more first CSI metrics from the buffer based at least in part on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that is lower than a second priority of the second CSI report; andstore the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.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:remove the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold and on the first CSI report having a first priority that is higher than a second priority of the second CSI report; andstore the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.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:reduce a first priority of the first CSI report based at least in part on the buffer duration satisfying a second threshold, wherein transmitting either the first CSI report or the second CSI report is based at least in part on the first priority of the first CSI report and a second priority of the second CSI report.6.The UE of claim 1, wherein the buffer duration begins at a start time of generating the one or more first CSI metrics using the first CSI processing unit.7.The UE of claim 1, wherein the buffer duration begins after a maximum processing time associated generating the one or more first CSI metrics using the first CSI processing unit.8.The UE of claim 1, wherein the buffer duration begins after a minimum processing time associated generating the one or more first CSI metrics using the first CSI processing unit.9.The UE of claim 1, wherein, to transmit either the first CSI report or the second CSI report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:transmit the first CSI report based at least in part on the buffer duration being active during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, wherein the quantity of symbols is based at least in part on a layer 1 processing time associated with communicating the first CSI report.10.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:remove the one or more first CSI metrics from the buffer based at least in part on the buffer duration being inactive during a quantity of symbols prior to a first symbol of an uplink channel resource configured for transmission of the first CSI report, wherein the quantity of symbols is based at least in part on a layer 1 processing time associated with communicating the first CSI report, and wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on removing the one or more first CSI metrics from the buffer.11.The UE of claim 10, wherein the second CSI report comprises one or more third CSI metrics different than the one or more second CSI metrics, the one or more third CSI metrics being generated in accordance with a dummy CSI format.12.The UE of claim 1, wherein, to transmit either the first CSI report or the second CSI report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:transmit the first CSI report prior to the buffer duration satisfying the threshold; andstore the one or more second CSI metrics to the buffer based at least in part on transmitting the first CSI report.13.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:transmit an indication of a capability of the UE, wherein the capability is associated with a maximum quantity of CSI metrics supported by the buffer, and wherein the maximum quantity is based at least in part on one or more reference parameters associated with a reference CSI report configuration.14.The UE of claim 13, wherein:a total quantity of a plurality of CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer, andthe one or more first CSI metrics stored to the buffer comprises a subset of CSI metrics of the plurality of CSI metrics based at least in part on the total quantity being greater than the available quantity of CSI metrics.15.The UE of claim 13, wherein:a total quantity of a plurality of CSI metrics associated with the first CSI report is greater than an available quantity of CSI metrics supported by the buffer, andthe one or more first CSI metrics stored to the buffer are associated with a lower rank than a rank indicated by the first set of parameters based at least in part on the total quantity being greater than the available quantity of CSI metrics.16.A method for wireless communications at a user equipment (UE) , comprising:receiving control signaling that indicates a first set of parameters for transmission of a first channel state information (CSI) report and a second set of parameters for transmission of a second CSI report;generating, using a first CSI processing unit of the UE, one or more first CSI metrics for the first CSI report, wherein the one or more first CSI metrics are stored in a buffer of the UE;generating, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report; andtransmitting either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based at least in part on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.17.The method of claim 16, further comprising:removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold; andstoring the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.18.The method of claim 16, further comprising:removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration failing to satisfy the threshold and on the first CSI report having a first priority that is lower than a second priority of the second CSI report; andstoring the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.19.The method of claim 16, further comprising:removing the one or more first CSI metrics from the buffer based at least in part on the buffer duration satisfying the threshold and on the first CSI report having a first priority that is higher than a second priority of the second CSI report; andstoring the one or more second CSI metrics to the buffer based at least in part on removing the one or more first CSI metrics, wherein transmitting either the first CSI report or the second CSI report comprises transmitting the second CSI report based at least in part on storing the one or more second CSI metrics to the buffer.20.A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to:receive control signaling that indicates a first set of parameters for transmission of a first channel state information (CSI) report and a second set of parameters for transmission of a second CSI report;generate, using a first CSI processing unit of a user equipment (UE) , one or more first CSI metrics for the first CSI report, wherein the one or more first CSI metrics are stored in a buffer of the UE;generate, using a second CSI processing unit of the UE, one or more second CSI metrics for the second CSI report; andtransmit either the first CSI report in accordance with the first set of parameters or the second CSI report in accordance with the second set of parameters based at least in part on whether a buffer duration of the one or more first CSI metrics satisfies a threshold.