WO2021237703A1

WO2021237703A1 - Distance based srs configuration

Info

Publication number: WO2021237703A1
Application number: PCT/CN2020/093373
Authority: WO
Inventors: Zhuoqi XU; Yuankun ZHU; Pan JIANG
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-12-02
Anticipated expiration: 2022-11-29

Abstract

In one aspect, a method of wireless communication includes receiving, by a network entity, a message from a user equipment (UE). The method also includes determining, by the network entity, a timing advance (TA) value based on the message, and determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds. The method further includes transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration. Other aspects and features are also claimed and described.

Description

DISTANCE BASED SRS CONFIGURATION

BACKGROUND

Field

Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to Sounding Reference Signal (SRS) operations. Certain embodiments of the technology discussed below can enable and provide enhanced configuration operations for SRS transmissions.

Background

Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources. One example of such a network is the Universal Terrestrial Radio Access Network (UTRAN) . The UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) . Examples of multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, and Single-Carrier FDMA (SC-FDMA) networks.

A wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) . A UE may communicate with a base station via downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

A base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE. On the downlink, a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters. On the uplink, a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.

As the demand for mobile broadband access continues to increase, the possibilities of interference and congested networks grows with more UEs accessing the long-range wireless communication networks and more short-range wireless systems being deployed in communities. Research and development continue to advance wireless technologies not only to meet the growing demand for mobile broadband access, but to advance and enhance the user experience with mobile communications.

SUMMARY

The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later.

In one aspect of the disclosure, a method of wireless communication includes receiving, by a network entity, a message from a user equipment (UE) ; determining, by the network entity, a timing advance (TA) value based on the message; determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes means for receiving, by a network entity, a message from a user equipment (UE) ; means for determining, by the network entity, a timing advance (TA) value based on the message; means for determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and means for transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to receive, by a network entity, a message from a user equipment (UE) ; determining, by the network entity, a timing advance (TA) value based on the message; determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to receive, by a network entity, a message from a user equipment (UE) ; determining, by the network entity, a timing advance (TA) value based on the message; determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.

In another aspect of the disclosure, a method of wireless communication includes transmitting, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and receiving, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes a transmitting, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and receiving, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to transmit, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and receive, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to transmit, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and receive, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.

The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. 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.

FIG. 1 is a block diagram illustrating details of a wireless communication system.

FIG. 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.

FIG. 3A is a diagram of a SRS Resource.

FIG. 3B is a diagram of a SRS bandwidth configuration table.

FIG. 3C is a diagram of SRS bandwidth configurations.

FIG. 4 is a block diagram illustrating an example of a wireless communications system (with a UE and base station) with TA based SRS configuration operations.

FIG. 5 is a ladder diagram of an example of TA based SRS configuration operations according to some embodiments of the present disclosure.

FIG. 6 is an example of a logic diagram for TA based SRS configuration determination.

FIG. 7 is a flow diagram illustrating example blocks executed by a UE configured according to an aspect of the present disclosure.

FIG. 8 is a flow diagram illustrating example blocks executed by a base station configured according to an aspect of the present disclosure.

FIG. 9 is a block diagram conceptually illustrating a design of a UE configured to perform precoding information update operations according to some embodiments of the present disclosure.

FIG. 10 is a block diagram conceptually illustrating a design of a base station configured to perform precoding information update operations according to some embodiments of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below, in connection with the appended drawings, is intended as a description of various configurations and is not intended to limit the scope of the disclosure. Rather, the detailed description includes specific details for the purpose of providing a thorough understanding of the inventive subject matter. It will be apparent to those skilled in the art that these specific details are not required in every case and that, in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks. In various embodiments, the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5 ^th Generation (5G) or new radio (NR) networks, as well as other communications networks. As described herein, the terms “networks” and “systems” may be used interchangeably.

An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of universal mobile telecommunication system (UMTS) . In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP) , and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) . These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project which was aimed at improving the universal mobile telecommunications system (UMTS) mobile phone standard. The 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.

In particular, 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. In order to achieve these goals, further enhancements to LTE and LTE-Aare considered in addition to development of the new radio technology for 5G NR networks. The 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ～1M nodes/km ²) , ultra-low complexity (e.g., ～10s of bits/sec) , ultra-low energy (e.g., ～10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ～99.9999%reliability) , ultra-low latency (e.g., ～ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ～ 10 Tbps/km ²) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.

The 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth. For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting with mmWave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500MHz bandwidth.

The scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.

Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect may comprise at least one element of a claim.

FIG. 1 is a block diagram illustrating 5G network 100 including various base stations and UEs configured according to aspects of the present disclosure. The 5G network 100 includes a number of base stations 105 and other network entities. A base station may be a station that communicates with the UEs and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point, and the like. Each base station 105 may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to this particular geographic coverage area of a base station and/or a base station subsystem serving the coverage area, depending on the context in which the term is used.

A base station may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell. A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) . A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station or a home base station. In the example shown in FIG. 1, the

base stations

105d and 105e are regular macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3 dimension (3D) , full dimension (FD) , or massive MIMO. Base stations 105a-105c take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station which may be a home node or portable access point. A base station may support one or multiple (e.g., two, three, four, and the like) cells.

The 5G network 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.

The UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like. A UE may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like. In one aspect, a UE may be a device that includes a Universal Integrated Circuit Card (UICC) . In another aspect, a UE may be a device that does not include a UICC. In some aspects, UEs that do not include UICCs may also be referred to as internet of everything (IoE) or internet of things (IoT) devices. UEs 115a-115d are examples of mobile smart phone-type devices accessing 5G network 100 A UE may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like. UEs 115e-115k are examples of various machines configured for communication that access 5G network 100. A UE may be able to communicate with any type of the base stations, whether macro base station, small cell, or the like. In FIG. 1, a lightning bolt (e.g., communication links) indicates wireless transmissions between a UE and a serving base station, which is a base station designated to serve the UE on the downlink and/or uplink, or desired transmission between base stations, and backhaul transmissions between base stations.

In operation at 5G network 100, base stations 105a-105c serve

UEs

115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. Macro base station 105d performs backhaul communications with base stations 105a-105c, as well as small cell, base station 105f. Macro base station 105d also transmits multicast services which are subscribed to and received by

UEs

115c and 115d. Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

5G network 100 also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such UE 115e, which is a drone. Redundant communication links with UE 115e include from

macro base stations

105d and 105e, as well as small cell base station 105f. Other machine type devices, such as UE 115f (thermometer) , UE 115g (smart meter) , and UE 115h (wearable device) may communicate through 5G network 100 either directly with base stations, such as small cell base station 105f, and macro base station 105e, or in multi-hop configurations by communicating with another user device which relays its information to the network, such as UE 115f communicating temperature measurement information to the smart meter, UE 115g, which is then reported to the network through small cell base station 105f. 5G network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with macro base station 105e.

FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be one of the base station and one of the UEs in FIG. 1. At the base station 105, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be for the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc. The data may be for the PDSCH, etc. The transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal. A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.

At the UE 115, the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.

On the uplink, at the UE 115, a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280. The transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115. The processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.

The controllers/

processors

240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller/processor 240 and/or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein. The controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIGS. 7 and 8, and/or other processes for the techniques described herein. The

memories

242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.

Wireless communications systems operated by different network operating entities (e.g., network operators) may share spectrum. In some instances, a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time. Thus, in order to allow network operating entities use of the full designated shared spectrum, and in order to mitigate interfering communications between the different network operating entities, certain resources (e.g., time) may be partitioned and allocated to the different network operating entities for certain types of communication.

For example, a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum. The network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum. These time resources, prioritized for use by the network operating entity, may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.

Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.

In some cases, UE 115 and base station 105 of the 5G network 100 (in FIG 1) may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum. For example, UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available. A CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter. A CCA also may include detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence. In some cases, an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.

In general, four categories of LBT procedure have been suggested for sensing a shared channel for signals that may indicate the channel is already occupied. In a first category (CAT 1 LBT) , no LBT or CCA is applied to detect occupancy of the shared channel. A second category (CAT 2 LBT) , which may also be referred to as an abbreviated LBT, a single-shot LBT, or a 25-μs LBT, provides for the node to perform a CCA to detect energy above a predetermined threshold or detect a message or preamble occupying the shared channel. The CAT 2 LBT performs the CCA without using a random back-off operation, which results in its abbreviated length, relative to the next categories.

A third category (CAT 3 LBT) performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the node may proceed to transmit. However, if the first CCA detects a signal occupying the shared channel, the node selects a random back-off based on the fixed contention window size and performs an extended CCA. If the shared channel is detected to be idle during the extended CCA and the random number has been decremented to 0, then the node may begin transmission on the shared channel. Otherwise, the node decrements the random number and performs another extended CCA. The node would continue performing extended CCA until the random number reaches 0. If the random number reaches 0 without any of the extended CCAs detecting channel occupancy, the node may then transmit on the shared channel. If at any of the extended CCA, the node detects channel occupancy, the node may re-select a new random back-off based on the fixed contention window size to begin the countdown again.

A fourth category (CAT 4 LBT) , which may also be referred to as a full LBT procedure, performs the CCA with energy or message detection using a random back-off and variable contention window size. The sequence of CCA detection proceeds similarly to the process of the CAT 3 LBT, except that the contention window size is variable for the CAT 4 LBT procedure.

Use of a medium-sensing procedure to contend for access to an unlicensed shared spectrum may result in communication inefficiencies. This may be particularly evident when multiple network operating entities (e.g., network operators) are attempting to access a shared resource. In the 5G network 100, base stations 105 and UEs 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.

FIGS. 3A, 3B, and 3C depict SRS and TA related diagrams. FIG. 3A is a diagram 300 of a SRS Resource. In FIG. 3A, the SRS-Resource includes a frequency hopping information element. The frequency hopping information element has a sequence of 3 sub-elements, a first sub-element of c-SRS, a first sub-element of b-SRS, and a first sub-element of b-hop. In the particular example, of FIG. 3A, the first sub-element c-SRS can have a value of 0 to 63 and occupies 8 bits, the second sub-element b-SRS can have a value of 0 to 3 and occupies 2 bits, and the third sub-element b-hop can have a value of 0 to 3 and occupies 2 bits.

The SRS-Resource is used to indicate a SRS configuration. For example, one or more sub-elements of the SRS-Resource may be used to indicate a portion of the SRS-configuration indirectly. To illustrate, one or more sub-elements of the SRS-Resource may be used to look-up /select a SRS configuration from a table, such as the example SRS bandwidth configuration table of FIG. 3B. Additionally, or alternatively, one or more sub-elements of the SRS-Resource may indicate a portion of the SRS-configuration directly. To illustrate, the third sub-element b-hop may indicate a hopping value (e.g., a frequency hopping value) of the SRS configuration. Referring to FIG. 3B, FIG. 3B is a diagram 310 of a portion of example of a SRS bandwidth configuration table. FIG. 3B depicts a five column, four row chart illustrating four columns and three rows of entries of a SRS bandwidth configuration table, or 12 entries.

A first row of the table corresponds to headers of the columns of the table, and the second through fourth rows correspond to entry rows of the table. A first column of the table depicts c-SRS values, and second through fifth columns depict corresponding entries for the particular c-SRS values. Specifically, the second through fifth columns depict corresponding m-srs values and n values for a given b-srs value and c-srs value combination.

The m-srs value indicates or corresponds to total number of SRS transmission in a slot. For example, a m-srs value of 272 indicates 272 resource blocks (RBs) of SRS’s in a SRS transmission, as illustrated in FIG. 3C. The n value indicates or corresponds to a spacing between the SRS’s of the SRS transmission. For example, an n value of 1 indicates no spacing between SRS’s and an n value of 2 indicates one “empty” RB space between each SRS or one SRS every for two RB’s of a particular SRS transmission. SRS transmission may be multiplexed and may multipole types of SRS’s woven in between each other.

Referring to FIG. 3C, FIG. 3C is a diagram 320 of SRS bandwidth configurations. FIG. 3C depicts four different SRS configurations each with an n value of 1. In FIG. 3C, a first SRS configuration has 272 RB’s of SRS’s , a second SRS configuration has 136 RB’s of SRS’s , a third SRS configuration has 68 RB’s of SRS’s , and a fourth SRS configuration has 1 RB of SRS. The SRS configurations shown in FIG. 3C have different bandwidths. To illustrate, the first SRS configuration has wideband bandwidth and the fourth SRS configuration has narrowband bandwidth. The second and third SRS configurations each have a partial wideband bandwidth (or partial narrowband bandwidth) .

Generally, when UE has good coverage from a serving cell with good channel condition, it is better for the UE to send a full wide-band SRS (e.g., first /wideband SRS configuration) at one time to the network for the fast channel estimation (e.g., generation of CSI) . However, when a UE has poor coverage, it is more precise for the UE to send a narrow-band SRS to the network. An inappropriate bandwidth of SRS configuration may cause the network to estimate channel conditions inaccurately.

Thus, networks and network devices should take care of the number of RB occupied by SRS based on UE coverage. Device location (e.g., distance between devices) is one large factor of UE coverage. Currently, networks do not take into account distance between the network devices and the UEs when determining SRS configurations. Accordingly, network performance can be improved by enhanced SRS configuration determination based on device location s can be (e.g., distance between devices)

As an example, a timing advance (TA) value can be used to determine distance. The TA value is an indication /approximation of the distance between the UE and a network device (e.g., base station) . To illustrate, the TA value indicates the offset needed for communications based on signal travel time, which is highly correlated to distance between the devices and a factor of channel condition.

To illustrate, a TA value sent by the network in MSG2 (RACH response, (RAR) ) can reflect the distance of UE from the network device. The network calculates the TA value based on MSG1 (e.g., RACH preamble) received from the UE, and the network can use the TA calculated based on MSG1 to estimate the location of the UE in the Cell (serving area of the network device) . The network can then reconfigure wide-band or narrow-narrow band SRS configuration to UE based on UE distance via the TA value. Such SRS configurations enable the network to better and more accurately set the SRS configuration. As explained above, a more accurate SRS configuration enables the network to more accurately estimate the channel. More precise channel estimates (e.g., CSI) enable better performance by the network, such as the ability to take advantage of available bandwidth and speeds and to reduce latency and failed transmissions.

FIG. 4 illustrates an example of a wireless communications system 400 that supports enhanced SRS configuration in accordance with aspects of the present disclosure. In some examples, wireless communications system 400 may implement aspects of wireless communication system 100. For example, wireless communications system 400 may include UE 115 and network entity 405. Enhanced SRS configuration operations, such as TA value dependent SRS configurations, may increase throughput and reliability by increasing channel estimation performance. Thus, network and device performance can be increased.

Network entity 405 and UE 115 UE 115 may be configured to communicate via frequency bands, such as FR1 having a frequency of 410 to 7125 MHz, FR2 having a frequency of 24250 to 52600 MHz for mm-Wave, and/or one or more other frequency bands. It is noted that sub-carrier spacing (SCS) may be equal to 15, 30, 60, or 120 kHz for some data channels. Network entity 405 and UE 115 may be configured to communicate via one or more component carriers (CCs) , such as representative first CC 481, second CC 482, third CC 483, and fourth CC 484. Although four CCs are shown, this is for illustration only, more or fewer than four CCs may be used. One or more CCs may be used to communicate control channel transmissions, data channel transmissions, and/or sidelink channel transmissions.

Such transmissions may include a Physical Downlink Control Channel (PDCCH) , a Physical Downlink Shared Channel (PDSCH) , a Physical Uplink Control Channel (PUCCH) , a Physical Uplink Shared Channel (PUSCH) , a Physical Sidelink Control Channel (PSCCH) , a Physical Sidelink Shared Channel (PSSCH) , or a Physical Sidelink Feedback Channel (PSFCH) . Such transmissions may be scheduled by aperiodic grants and/or periodic grants.

Each periodic grant may have a corresponding configuration, such as configuration parameters/settings. The periodic grant configuration may include configured grant (CG) configurations and settings. Additionally, or alternatively, one or more periodic grants (e.g., CGs thereof) may have or be assigned to a CC ID, such as intended CC ID.

Each CC may have a corresponding configuration, such as configuration parameters/settings. The configuration may include bandwidth, bandwidth part, HARQ process, TCI state, RS, control channel resources, data channel resources, or a combination thereof. Additionally, or alternatively, one or more CCs may have or be assigned to a Cell ID, a Bandwidth Part (BWP) ID, or both. The Cell ID may include a unique cell ID for the CC, a virtual Cell ID, or a particular Cell ID of a particular CC of the plurality of CCs. Additionally, or alternatively, one or more CCs may have or be assigned to a HARQ ID. Each CC may also have corresponding management functionalities, such as, beam management, BWP switching functionality, or both. In some implementations, two or more CCs are quasi co-located, such that the CCs have the same beam and/or same symbol.

In some implementations, control information may be communicated via network entity 405 and UE 115. For example, the control information may be communicated suing MAC-CE transmissions, RRC transmissions, DCI, transmissions, another transmission, or a combination thereof.

UE 115 can include a variety of components (e.g., structural, hardware components) used for carrying out one or more functions described herein. For example, these components can includes processor 402, memory 404, transmitter 410, receiver 412, encoder, 413, decoder 414, SRS configuration manager 415, and antennas 252a-r. Processor 402 may be configured to execute instructions stored at memory 404 to perform the operations described herein. In some implementations, processor 402 includes or corresponds to controller/processor 280, and memory 404 includes or corresponds to memory 282. Memory 404 may also be configured to store TA value data 406, TA threshold data 408, SRS configuration data 442, settings data 444, or a combination thereof, as further described herein.

The TA value data 406 includes or corresponds to data associated with or corresponding to a TA value. For example, the TA value data 406 may include a TA value received from a network entity. The TA value may include or correspond to a TA index value. The TA threshold data 408 includes or corresponds to data indicating or corresponding to one or more TA thresholds. For example, the TA thresholds may include 3 TA thresholds, such as TA_0 to TA_2. The TA thresholds may be expressed as TA index values or in a particular unit, such as seconds or minutes. As illustrative, non-limiting examples a first threshold (TA_0) may be 3, a second threshold (TA_1) may be 8, and a third threshold (TA_2) may be 16. The TA thresholds may be set by the network. Additionally, or alternatively, the TA thresholds may correspond to an operational setting of the network or devices thereof. To illustrate, a first set of thresholds may be used for rural networks, and a second set of thresholds may be used for urban settings. As another illustration, additional thresholds or adjustments may be based on elevation, temperature, population density, etc.

The SRS configuration data 442 includes or corresponds to data that indicates a determined or indicated SRS configuration. The SRS configuration data 442 may indicate a particular SRS configuration or bandwidth directly, such as by indicating a number of RB’s of SRS’s . The SRS configuration data 442 may also indicate the SRS configuration indirectly by indicating parameters and/or conditions for determining an SRS configuration, such as an evaluation of a TA value for SRS configuration determination. The settings data 444 includes or corresponds to data associated with TA based or dependent SRS configuration. The settings data 444 may include one or more type of enhanced SRS configuration modes and/or thresholds or conditions for selecting and/or implementing the SRS configurations or modes.

Transmitter 410 is configured to transmit data to one or more other devices, and receiver 412 is configured to receive data from one or more other devices. For example, transmitter 410 may transmit data, and receiver 412 may receive data, via a network, such as a wired network, a wireless network, or a combination thereof. For example, UE 115 may be configured to transmit and/or receive data via a direct device-to-device connection, a local area network (LAN) , a wide area network (WAN) , a modem-to-modem connection, the Internet, intranet, extranet, cable transmission system, cellular communication network, any combination of the above, or any other communications network now known or later developed within which permits two or more electronic devices to communicate. In some implementations, transmitter 410 and receiver 412 may be replaced with a transceiver. Additionally, or alternatively, transmitter 410, receiver, 412, or both may include or correspond to one or more components of UE 115 described with reference to FIG. 2.

Encoder 413 and decoder 414 may be configured to encode and decode data for transmission. SRS configuration manager 415 may be configured to determine and perform SRS configuration management and selection operations. For example, SRS configuration manager 415 is configured to determine a SRS configuration mode based on a TA value. To illustrate, SRS configuration manager 415 may determine an SRS configuration based on a received TA value. As another illustration, SRS configuration manager 415 may determine an SRS configuration based on a received SRS configuration indication, which was itself determined based on using a TA value. Thus, either the network or the UE may determine the SRS configuration.

Network entity 405 includes processor 430, memory 432, transmitter 434, receiver 436, encoder 437, decoder 438, TA determiner 439, SRS configuration manager 440, and antennas 234a-t. Processor 430 may be configured to execute instructions stores at memory 432 to perform the operations described herein. In some implementations, processor 430 includes or corresponds to controller/processor 240, and memory 432 includes or corresponds to memory 242. Memory 432 may be configured to store TA value data 406, TA threshold data 408, SRS configuration data 442, settings data 444, or a combination thereof, similar to the UE 115 and as further described herein.

Transmitter 434 is configured to transmit data to one or more other devices, and receiver 436 is configured to receive data from one or more other devices. For example, transmitter 434 may transmit data, and receiver 436 may receive data, via a network, such as a wired network, a wireless network, or a combination thereof. For example, network entity 405 may be configured to transmit and/or receive data via a direct device-to-device connection, a local area network (LAN) , a wide area network (WAN) , a modem-to-modem connection, the Internet, intranet, extranet, cable transmission system, cellular communication network, any combination of the above, or any other communications network now known or later developed within which permits two or more electronic devices to communicate. In some implementations, transmitter 434 and receiver 436 may be replaced with a transceiver. Additionally, or alternatively, transmitter 434, receiver, 436, or both may include or correspond to one or more components of network entity 405 described with reference to FIG. 2.

Encoder 437, and decoder 438 may include the same functionality as described with reference to encoder 413 and decoder 414, respectively. TA determiner 439 may be configured to determine and perform TA determination operations. For example, TA determiner 415 is configured to calculate a TA value based on particular message, such a RACH message (e.g., MSG1 /RACH preamble) . To illustrate, TA determiner 439 may calculate a TA value for a particular UE responsive to and based on a RACH preamble message. In some implementations, the TA determiner 439 may calculate a TA index value based on the TA value. SRS configuration manager 440 may include similar functionality as described with reference to SRS configuration manager 415.

During operation of wireless communications system 400, devices of wireless communications system 400 perform dynamic selection and signaling of SRS configurations. For example, a UE 115 may generate a first message 462 MSG1 (e.g., RACH preamble) and transmit the first message 462 to the network entity 405.

After receiving the first message 462, the network entity 405 may generate a TA value. For example, the network entity 405 may calculate the TA value to generate the TA value data 406. TA value calculation may performed by conventional methods.

The network entity 405 then determines SRS configuration mode data 442 based on the TA value data 406 and the TA thresholds data 408. For example, the network entity 405 performs a series of evaluations using the TA value data 406 and the TA thresholds data 408. To illustrate, the network entity 405 compares the TA value or a distance value determined/calculated based on the TA value, such as a TA index value, to one or more thresholds of the TA thresholds data 408 to determine an SRS configuration parameter. The network entity 405 may use preset thresholds based on a particular operational setting.

After the network entity 405 determines an SRS configuration parameter, the network entity 405 may use the determined SRS configuration parameter to determine the SRS configuration or a bandwidth of the SRS configuration, such as described with reference to FIGS. 3A-3C, 5 or 6.

The network entity 405 then indicates the determined SRS configuration mode to the UE 115. For example, the network entity 405 generates and sends an SRS configuration indication 464 to the UE 115 which indicates the determined SRS configuration mode. The indicated SRS configuration mode is generated based on the SRS configuration mode data 442. Alternatively, the network entity 405 sends a SRS configuration parameter to the UE 115, and the UE 115 determines the SRS configuration mode based on the signaled parameter.

After the UE 115 obtains the SRS configuration mode based on the SRS configuration indication 464, the UE 115 generates and transmits a SRS transmission 466 based on the SRS configuration mode. The SRS transmission 466 includes a number of RBs of SRSs as indicated by the SRS configuration mode.

The network entity 405 and UE 115 perform data channel transmissions 468 based on the SRS transmission 466. For example, the network entity 405 performs channel estimation procedures based on the SRS transmission 366 and then transmit downlink data (e.g., DL symbols) based on the channel estimation information. Additionally, the network entity 405 may indicate channel estimation information to the UE 1115, and the UE 115 may transmit uplink data (UL symbols) based on the channel estimation information. Thus, the network entity may be able to configure SRS transmissions based on a distance to the UE by using the TA value.

Accordingly, FIG. 4 describes enhanced SRS configuration operations. Using TA based SRS bandwidth configurations may enable increased throughput and reduced latency and thus, enhanced UE and network performance.

FIG. 5 illustrates and example ladder diagram for enhanced SRS configuration operations. Specifically, a network may be able to dynamically set or modify an SRS configuration and may be able to modify the SRS configuration based on a distance metric. Referring to FIG. 5, FIG. 5 is a ladder diagram of an example of TA based SRS configuration.

At 510, a UE 115 generates and transmits a first message (e.g., . MSG1) . For example, the first UE 115 may generate and send a RACH occasion message, such as a RACH preamble.

At 515, a base station 105 determines a timing advance (TA) value based on the first message. For example, the base station 105 may calculate the TA value as known in the art.

At 520, the base station 105 optionally generates and transmits a second message (e.g., MSG2) . For example, the base station 105 sends a RACH occasion message, such as a RACH Request (RAR) . The second message may include or indicate the TA value in some implementations.

At 525, the base station 105 determines an SRS configuration based on the TA value. For example, the base station 105 determines a particular SRS configuration parameter based on the TA value and one or more thresholds, such as described further with reference to FIG. 6, and then selects a particular SRS configuration (e.g., bandwidth) from a SRS configuration table, as described with reference to FIGS. 3A-3C which was determined based on the TA value.

At 530, the base station 105 transmits an SRS configuration. For example, the base station 105 generates a message /transmission which indicates the SRS configuration. As another example, the base station generates a message /transmission which indicates an SRS configuration parameter. The message /transmission may include or correspond to a DCI transmission or MAC CE transmission.

At 535, the base station 105 receives an SRS transmission. For example, the UE 115 transmits a SRS transmission with a bandwidth indicated by the SRS configuration. To illustrate, the UE 115 transmits an SRS transmission with 272 RBs of SRSs.

At 540, the base station 105 performs channel estimation based on the received SRS transmission. For example, the base station 105 may determine channel state information (CSI) based on the SRSs of the SRS transmission. The base station 105 may use the CSI to send and/or receive data. For example, the base station 105 may use the CSI to adjust transmission and/or reception parameters, allocate bandwidth, adjust timings, etc. To illustrate, the base station and UE may operate as shown in FIG. 5.

At 545, the base station 105 generates and transmits downlink data based on the channel estimation. For example, the base station 105 generates and transmits downlink data based on the CSI. To illustrate, a transmission setting of the base station 105 or a reception setting of the UE 115 may be influenced by the CSI, which was determined based on the SRS configuration influenced by the TA value

At 550, the UE 115 generates and transmits uplink data based on the channel estimation. For example, the UE 115 generates and transmits uplink data based on the CSI. To illustrate, a transmission setting of the UE 115 or a reception setting of the base station 105 may be influenced by the CSI of the base station 105, which was determined based on the SRS configuration influenced by the TA value. Although the downlink and uplink transmissions of 545 and 550 are illustrated on separate lines /timing, such transmissions may be at least partially concurrent, such as simultaneous transmissions, in some implementations.

At 555, the UE generates and transmits an acknowledgement message (ACK) . For example, the UE 115 generates an ACK for the DL data and transmits the ACK to the base station 105.

Thus, in the example in FIG. 5, the UE and network entity employ dynamic SRS configuration based on a TA value. That is, the UE and network can modify SRS configurations dynamically, such as independent of RRC, and dependent on a TA based distance metric to improve channel estimation and network performance.

Referring to FIG. 6, FIG. 6 is an example of a logic diagram for TA based SRS configuration determination. Specifically, FIG. 6 is logic diagram for determining a particular SRS configuration parameter, b-srs, based on a calculated timing advance value. Determination of the particular SRS configuration parameter, b-srs, influences the overall SRS configuration. Additionally, the particular SRS configuration parameter, b-srs, of the example used in FIG. 6 may also be used to determine a bandwidth of the SRS transmission, as explained with reference to FIGS. 3A-3C. To illustrate, the SRS configuration parameter can be used to determine Msrs, i.e., the number of RBs of SRSs.

At 610, a network determines whether the calculated TA value is less than a threshold. For example, the gNB determines whether the calculated TA value is greater than a first threshold TA_0.

At 615, the network determines whether the calculated TA value is between two thresholds. For example, the gNB determines whether the calculated TA value is greater than the first threshold TA_0 and less than a second threshold TA_1.

At 620, the network determines whether the calculated TA value is between two thresholds. For example, the gNB determines whether the calculated TA value is greater than the second threshold TA_1 and less than a third threshold TA_2.

At 625, the network determines whether the calculated TA value is greater than a threshold. For example, the gNB determines whether the calculated TA value is greater than the third threshold TA_2.

Thus, in the example in FIG. 6, the UE and network entity employ a particular type of TA and TA threshold evaluation. Particular devices may be set to operate in one type of SRS configuration mode depending on hardware capabilities or may switch between the SRS configuration modes of FIGS. 4, 5, and/or 6 based on one or more conditions or inputs.

Additionally, or alternatively, one or more operations of FIGS. 4, 5, and/or 6 may be added, removed, substituted in other implementations. For example, additional evaluations for additional TA thresholds may be added to FIG. 6.

Although the determinations shown in FIG. 6 relate to a single parameter, in other implementations, the determinations may relate to multiple parameters to different parameters, or both. For example, one of the above determinations (e.g., 615) may indicate /set two parameters (e.g., b-srs =1 and c-srs = 1) in response to satisfying the corresponding condition. The other parameters may include c-SRS, m-SRS, b-SRS, b-hop, n, etc. Similarly, in addition to using multiple or different parameters, additional determinations may be made for other parameters. Such determinations may use different thresholds or similar thresholds. For example, a new set of determinations, with similar thresholds (TA_0 through TA_2) or different thresholds (TA_3 through TA_5) , may be used to determine a second parameter (c-srs) used to determine an SRS configuration (e.g., at least one parameter thereof) .

FIG. 7 is a flow diagram illustrating example blocks executed by a UE configured according to an aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIG. 9. FIG. 9 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure. UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2. For example, UE 115 includes controller/processor 280, which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115. UE 115, under control of controller/processor 280, transmits and receives signals via wireless radios 900a-r and antennas 252a-r. Wireless radios 900a-r includes various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266. As illustrated in the example of FIG. 9, memory 282 stores SRS configuration logic 902, TA determination logic 903, TA value data 904, TA thresholds data 905, SRS resource data 906, and settings data 907.

At block 700, a wireless communication device, such as a UE, transmits a message to a host node /network entity (e.g., gNB) , the message configured to cause the network entity to determine a timing advance (TA) value. For example, the UE 115 transmits a RACH preamble or MSG1, as described with reference to FIGS. 4-6.

At block 701, the UE 115 receives a SRS configuration message indicating a SRS configuration determined based on the TA value. For example, the UE 115 receives a message indicating or including a SRS configuration or SRS configuration parameter, as described with reference to FIGS. 4-6.

The UE 115 may execute additional blocks (or the UE 115 may be configured further to perform additional operations) in other implementations. For example, the UE 115 may perform one or more operations described above. As another example, the UE 115 may transmit an SRS transmission based on the SRS configuration received. To illustrate, the UE 115 may set a bandwidth of the SRS transmission based on the SRS configuration received. The UE 115 may further receive a data transmission generated based on the SRS transmission.

In a first aspect, the base station 105 receives an SRS transmission responsive to the SRS configuration message and based on the determined SRS configuration.

In a second aspect, alone or in combination with one or more of the above aspects, the determined SRS configuration identifies a bandwidth of the SRS transmission (e.g., number of RBs of SRSs) .

In a third aspect, alone or in combination with one or more of the above aspects, the base station 105 determining the SRS configuration includes: determining a first parameter (e.g., c-SRS) based on an SRS-resource; determining a second parameter (e.g., b-SRS) based the TA value; and selecting the SRS configuration (e.g., Msrs) from a SRS bandwidth configuration table based on the first parameter and the second parameter.

In a fourth aspect, alone or in combination with one or more of the above aspects, the base station 105 determining the SRS configuration further includes: determining the second parameter independent of the SRS-resource.

In a fifth aspect, alone or in combination with one or more of the above aspects, the first parameter is c-SRS, and the second parameter is b-SRS.

In a sixth aspect, alone or in combination with one or more of the above aspects, the SRS-resource is RRC configured, and indicates values for the first parameter, the second parameter, and a third parameter (e.g., b-hop) .

In a seventh aspect, alone or in combination with one or more of the above aspects, the base station 105 transmits an RRC message indicating the SRS-resource.

In an eighth aspect, alone or in combination with one or more of the above aspects, the base station 105 determining the SRS configuration includes: determining whether the TA value is less than a first TA threshold of the one or more thresholds; determining whether the TA value is between the first TA threshold and a second TA threshold of the one or more thresholds; determining whether the TA value is between the second TA threshold and a third TA threshold of the one or more thresholds; or determining whether the TA value is greater than the third TA threshold.

In a ninth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is less than the first TA threshold, sets a b-SRS value to a first value (e.g., reconfiguring the SRS with b-SRS=0) , wherein the b-SRS value is used to determine the SRS configuration from a SRS bandwidth configuration table.

In a tenth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is less than the first TA threshold, determines the SRS configuration to be a first SRS configuration (e.g., the full-band SRS configuration) .

In an eleventh aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is between the first TA threshold and the second TA threshold, sets a b-SRS value to a second value (e.g., reconfiguring the SRS with b-SRS=1) .

In a twelfth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is between the first TA threshold and the second TA threshold, determines the SRS configuration to be a second SRS configuration (e.g., a first partial wideband configuration) .

In a thirteenth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is between the second TA threshold and the third TA threshold, sets a b-SRS value to a third value (e.g., reconfiguring the SRS with b-SRS=2) .

In a fourteenth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is between the second TA threshold and the third TA threshold, determines the SRS configuration to be a third SRS configuration (e.g., a first partial wideband configuration) .

In a fifteenth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is greater than the third TA threshold, sets a b-SRS value to a fourth value (e.g., reconfiguring the SRS with b-SRS=3) .

In a sixteenth aspect, alone or in combination with one or more of the above aspects, the base station 105, in response to determining that the TA value is greater than the third TA threshold, determines the SRS configuration to be a fourth SRS configuration (e.g., narrowband configuration) .

In a seventeenth aspect, alone or in combination with one or more of the above aspects, the one or more TA thresholds includes three TA thresholds, and wherein at least one threshold of the three thresholds is set by the network entity, determined based on an operating scenario, or both.

In an eighteenth aspect, alone or in combination with one or more of the above aspects, the TA value corresponds to a TA index value, further comprising calculating, by the network entity, a distance between the network entity and the UE based on the TA index value.

In a nineteenth aspect, alone or in combination with one or more of the above aspects, the SRS configuration message is a DCI message or an RRC message.

In a twentieth aspect, alone or in combination with one or more of the above aspects, the SRS configuration message indicates a SRS bandwidth (e.g., number of SRS RB’s /Msrs) .

In a twenty-first aspect, alone or in combination with one or more of the above aspects, the SRS configuration message indicates a SRS bandwidth determination parameter (e.g., b-srs) .

In a twenty-second aspect, alone or in combination with one or more of the above aspects, the message is message1 (MSG1) .

In a twenty-third aspect, alone or in combination with one or more of the above aspects, the message is RACH occasion message (e.g., PRACH transmission /RACH preamble) .

In a twenty-fourth aspect, alone or in combination with one or more of the above aspects, the base station 105 transmits a second message to the UE responsive to the message, the second message indicating the TA value.

In a twenty-fifth aspect, alone or in combination with one or more of the above aspects, the second message is message2 (MSG2) .

In a twenty-sixth aspect, alone or in combination with one or more of the above aspects, the second message is Random Access Channel Response (RAR) (i.e., RACH Response message) .

In a twenty-seventh aspect, alone or in combination with one or more of the above aspects, the base station 105, prior to receiving the message: determines a prior SRS configuration for the UE based on a prior TA value and the one or more TA thresholds; transmits a prior SRS configuration message to the UE indicating the determined prior SRS configuration; and receives a prior SRS transmission responsive to the prior SRS configuration message and based on the determined prior SRS configuration, the prior SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.

In a twenty-eighth aspect, alone or in combination with one or more of the above aspects, the base station 105, after transmitting the SRS configuration: determines a second SRS configuration for the UE based on a second TA value and the one or more TA thresholds; transmits a second SRS configuration message to the UE indicating the determined second SRS configuration; and receives a second SRS transmission responsive to the second SRS configuration message and based on the determined second SRS configuration, the second SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.

In a twenty-ninth aspect, alone or in combination with one or more of the above aspects, the TA value indicates an approximation of distance between the UE and the network entity.

Accordingly, a UE and a base station may perform TA based SRS configuration operations. By performing TA based SRS configuration operations, throughput and reliability may be increased.

FIG. 8 is a flow diagram illustrating example blocks executed by wireless communication device configured according to another aspect of the present disclosure. The example blocks will also be described with respect to base station 105 (e.g., gNB) as illustrated in FIG. 10. FIG. 10 is a block diagram illustrating base station 105 configured according to one aspect of the present disclosure. Base station 105 includes the structure, hardware, and components as illustrated for base station 105 of FIG. 2. For example, base station 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of base station 105 that provide the features and functionality of base station 105. Base station 105, under control of controller/processor 240, transmits and receives signals via wireless radios 1001a-t and antennas 234a-t. Wireless radios 1001a-t includes various components and hardware, as illustrated in FIG. 2 for base station 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230. As illustrated in the example of FIG. 15, memory 242 stores SRS configuration logic 1002, TA determination logic 1003, TA value data 1004, TA thresholds data 1005, SRS resource data 1006, and settings data 1007. One of more of 1002-1007 may include or correspond to one of 902-907.

At block 800, a wireless communication device, such as a base station, receives a message from a UE. For example, the base station 105 receives a RACH preamble or a MSG1, as described with reference to FIGS. 4-6.

At block 801, the base station 105 determines a TA value based on the message. For example, the base station 105 determines a TA value based on the RACH preamble or MSG1, as described with reference to FIGS. 4-6. The base station 105 may optionally generate a TA index based on the TA value.

At block 802, the base station 105 determine a SRS configuration for the UE based on the TA value and one or more TA thresholds. For example, the base station 105 compares the TA value, or TA index, to the one or more TA thresholds, as described with reference to FIGS. 4-6.

At block 803, the base station 105 transmits a SRS configuration message to the UE indicating the determined SRS configuration. For example, the base station 105 transmits a message indicating an SRS configuration, as described with reference to FIGS. 4-6.

The base station 105 may execute additional blocks (or the base station 105 may be configured further to perform additional operations) in other implementations. For example, the base station 105 may perform one or more operations described above. As another example, the base station 105 may perform one or more of the aspects described below.

Accordingly, a UE and a base station may perform TA based SRS configuration. By performing TA based SRS configuration, throughput and reliability may be increased.

Those of skill in the art would understand that information and signals 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 above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The functional blocks and modules in FIGS. 7 and 8 may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Skilled artisans will also readily recognize that the order or combination of components, methods, or interactions that are described herein are merely examples and that the components, methods, or interactions of the various aspects of the present disclosure may be combined or performed in ways other than those illustrated and described herein.

The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (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 conventional 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, a connection may be 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, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

As used herein, including in the claims, the term “and/or, ” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of” indicates a disjunctive 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) or any of these in any combination thereof.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A method of wireless communication comprising:

receiving, by a network entity, a message from a user equipment (UE) ;

determining, by the network entity, a timing advance (TA) value based on the message;

determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and

transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.
The method of claim 1, further comprising:

receiving, by the network entity, an SRS transmission responsive to the SRS configuration message and based on the determined SRS configuration.
The method of claim 1, wherein the determined SRS configuration identifies a bandwidth of the SRS transmission.
The method of claim 1, wherein determining the SRS configuration includes:

determining a first parameter based on an SRS-resource;

determining a second parameter based the TA value; and

selecting the SRS configuration from a SRS bandwidth configuration table based on the first parameter and the second parameter.
The method of claim 4, wherein determining the SRS configuration further includes:

determining the second parameter independent of the SRS-resource.
The method of claim 5, wherein the first parameter is c-SRS, and wherein the second parameter is b-SRS.
The method of claim 4, wherein the SRS-resource is RRC configured, and indicates values for the first parameter, the second parameter, and a third parameter.
The method of claim 7, further comprising transmitting, by the network entity, a Radio Resource Control (RRC) message indicating the SRS-resource.
The method of claim 1, wherein determining the SRS configuration includes:

determining whether the TA value is less than a first TA threshold of the one or more thresholds;

determining whether the TA value is between the first TA threshold and a second TA threshold of the one or more thresholds;

determining whether the TA value is between the second TA threshold and a third TA threshold of the one or more thresholds; or

determining whether the TA value is greater than the third TA threshold.
The method of claim 9, further comprising:

in response to determining that the TA value is less than the first TA threshold, setting a b-SRS value to a first value, wherein the b-SRS value is used to determine the SRS configuration from a SRS bandwidth configuration table.
The method of claim 9, further comprising:

in response to determining that the TA value is less than the first TA threshold, determining the SRS configuration to be a first SRS configuration.
The method of claim 9, further comprising:

in response to determining that the TA value is between the first TA threshold and the second TA threshold, setting a b-SRS value to a second value.
The method of claim 9, further comprising:

in response to determining that the TA value is between the first TA threshold and the second TA threshold, determining the SRS configuration to be a second SRS configuration.
The method of claim 9, further comprising:

in response to determining that the TA value is between the second TA threshold and the third TA threshold, setting a b-SRS value to a third value.
The method of claim 9, further comprising:

in response to determining that the TA value is between the second TA threshold and the third TA threshold, determining the SRS configuration to be a third SRS configuration.
The method of claim 9, further comprising:

in response to determining that the TA value is greater than the third TA threshold, setting a b-SRS value to a fourth value.
The method of claim 9, further comprising:

in response to determining that the TA value is greater than the third TA threshold, determining the SRS configuration to be a fourth SRS configuration.
The method of claim 9, wherein the one or more TA thresholds includes three TA thresholds, and wherein at least one threshold of the three thresholds is set by the network entity, determined based on an operating scenario, or both.
The method of claim 18, wherein the TA value corresponds to a TA index value, further comprising calculating, by the network entity, a distance between the network entity and the UE based on the TA index value.
The method of claim 1, wherein the SRS configuration message is a Radio Resource Control (RRC) message.
The method of claim 1, wherein the SRS configuration message indicates a SRS bandwidth.
The method of claim 1, wherein the SRS configuration message indicates a SRS bandwidth determination parameter.
The method of claim 1, wherein the message is message1 (MSG1) .
The method of claim 1, wherein the message is RACH occasion message.
The method of claim 1, further comprising transmitting, by the network entity, a second message to the UE responsive to the message, the second message indicating the TA value.
The method of claim 25, wherein the second message is message2 (MSG2) .
The method of claim 25, wherein the second message is Random Access Channel Response (RAR) .
The method of claim 1, further comprising, prior to receiving the message:

determining, by the network entity, a prior SRS configuration for the UE based on a prior TA value and the one or more TA thresholds;

transmitting, by the network entity, a prior SRS configuration message to the UE indicating the determined prior SRS configuration; and

receiving, by the network entity, a prior SRS transmission responsive to the prior SRS configuration message and based on the determined prior SRS configuration, the prior SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.
The method of claim 1, further comprising, after transmitting the SRS configuration:

determining, by the network entity, a second SRS configuration for the UE based on a second TA value and the one or more TA thresholds;

transmitting, by the network entity, a second SRS configuration message to the UE indicating the determined second SRS configuration; and

receiving, by the network entity, a second SRS transmission responsive to the second SRS configuration message and based on the determined second SRS configuration, the second SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.
The method of claim 1, wherein the TA value indicates an approximation of distance between the UE and the network entity.
A method of wireless communication comprising:

transmitting, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and

receiving, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.
The method of claim 31, further comprising:

receiving, by the network entity, an SRS transmission responsive to the SRS configuration message and based on the determined SRS configuration.
The method of claim 31, wherein the determined SRS configuration identifies a bandwidth of the SRS transmission.
The method of claim 31, wherein determining the SRS configuration includes:

determining a first parameter based on an SRS-resource;

determining a second parameter based the TA value; and

selecting the SRS configuration from a SRS bandwidth configuration table based on the first parameter and the second parameter.
The method of claim 34, wherein determining the SRS configuration further includes:

determining the second parameter independent of the SRS-resource.
The method of claim 35, wherein the first parameter is c-SRS, and wherein the second parameter is b-SRS.
The method of claim 34, wherein the SRS-resource is RRC configured, and indicates values for the first parameter, the second parameter, and a third parameter.
The method of claim 37, further comprising transmitting, by the network entity, a Radio Resource Control (RRC) message indicating the SRS-resource.
The method of claim 31, wherein determining the SRS configuration includes:

determining whether the TA value is less than a first TA threshold of the one or more thresholds;

determining whether the TA value is between the first TA threshold and a second TA threshold of the one or more thresholds;

determining whether the TA value is between the second TA threshold and a third TA threshold of the one or more thresholds; or

determining whether the TA value is greater than the third TA threshold.
The method of claim 39, further comprising:

in response to determining that the TA value is less than the first TA threshold, setting a b-SRS value to a first value, wherein the b-SRS value is used to determine the SRS configuration from a SRS bandwidth configuration table.
The method of claim 39, further comprising:

in response to determining that the TA value is less than the first TA threshold, determining the SRS configuration to be a first SRS configuration.
The method of claim 39, further comprising:

in response to determining that the TA value is between the first TA threshold and the second TA threshold, setting a b-SRS value to a second value.
The method of claim 39, further comprising:

in response to determining that the TA value is between the first TA threshold and the second TA threshold, determining the SRS configuration to be a second SRS configuration.
The method of claim 39, further comprising:

in response to determining that the TA value is between the second TA threshold and the third TA threshold, setting a b-SRS value to a third value.
The method of claim 39, further comprising:

in response to determining that the TA value is between the second TA threshold and the third TA threshold, determining the SRS configuration to be a third SRS configuration.
The method of claim 39, further comprising:

in response to determining that the TA value is greater than the third TA threshold, setting a b-SRS value to a fourth value.
The method of claim 39, further comprising:

in response to determining that the TA value is greater than the third TA threshold, determining the SRS configuration to be a fourth SRS configuration.
The method of claim 39, wherein the one or more TA thresholds includes three TA thresholds, and wherein at least one threshold of the three thresholds is set by the network entity, determined based on an operating scenario, or both.
The method of claim 48, wherein the TA value corresponds to a TA index value, further comprising calculating, by the network entity, a distance between the network entity and the UE based on the TA index value.
The method of claim 31, wherein the SRS configuration message is a Radio Resource Control (RRC) message.
The method of claim 31, wherein the SRS configuration message indicates a SRS bandwidth.
The method of claim 31, wherein the SRS configuration message indicates a SRS bandwidth determination parameter.
The method of claim 31, wherein the message is message1 (MSG1) .
The method of claim 31, wherein the message is RACH occasion message.
The method of claim 31, further comprising transmitting, by the network entity, a second message to the UE responsive to the message, the second message indicating the TA value.
The method of claim 55, wherein the second message is message2 (MSG2) .
The method of claim 55, wherein the second message is Random Access Channel Response (RAR) .
The method of claim 31, further comprising, prior to receiving the message:

determining, by the network entity, a prior SRS configuration for the UE based on a prior TA value and the one or more TA thresholds;

transmitting, by the network entity, a prior SRS configuration message to the UE indicating the determined prior SRS configuration; and

receiving, by the network entity, a prior SRS transmission responsive to the prior SRS configuration message and based on the determined prior SRS configuration, the prior SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.
The method of claim 31, further comprising, after transmitting the SRS configuration:

determining, by the network entity, a second SRS configuration for the UE based on a second TA value and the one or more TA thresholds;

transmitting, by the network entity, a second SRS configuration message to the UE indicating the determined second SRS configuration; and

receiving, by the network entity, a second SRS transmission responsive to the second SRS configuration message and based on the determined second SRS configuration, the second SRS transmission having a second bandwidth different from a first bandwidth of the SRS transmission.
The method of claim 31, wherein the TA value indicates an approximation of distance between the UE and the network entity.
An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

receive, by a network entity, a message from a user equipment (UE) ;

determine, by the network entity, a timing advance (TA) value based on the message;

determine, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and

transmit, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.
The apparatus of claim 61, wherein the apparatus is configured to perform a method as in any of claims 1-30.
An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

transmit, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and

receive, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.
The apparatus of claim 63, wherein the apparatus is configured to perform a method as in any of claims 31-60.
An apparatus configured for wireless communication, comprising:

means for receiving, by a network entity, a message from a user equipment (UE) ;

means for determining, by the network entity, a timing advance (TA) value based on the message;

means for determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and

means for transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.
The apparatus of claim 65, wherein the apparatus is configured to perform a method as in any of claims 1-30.
An apparatus configured for wireless communication, comprising:

means for transmitting, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and

means for receiving, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.
The apparatus of claim 67, wherein the apparatus is configured to perform a method as in any of claims 31-60.
A non-transitory, computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

receiving, by a network entity, a message from a user equipment (UE) ;

determining, by the network entity, a timing advance (TA) value based on the message;

determining, by the network entity, a sounding reference signal (SRS) configuration for the UE based on the TA value and one or more TA thresholds; and

transmitting, by the network entity, a SRS configuration message to the UE indicating the determined SRS configuration.
The non-transitory, computer-readable medium of claim 69, wherein the apparatus is configured to perform a method as in any of claims 1-30.
A non-transitory, computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

transmitting, by a user equipment (UE) , a message to a network entity, the message configured to cause the network entity to determine a timing advance (TA) value; and

receiving, by the UE, a SRS configuration message indicating a SRS configuration determined based on the TA value.
The non-transitory, computer-readable medium of claim 71, wherein the apparatus is configured to perform a method as in any of claims 31-60.