Method, user equipment and base station for dynamic automatic gain control (AGC) reference signaling

Abstract

A scheme, mechanism, and apparatus for automatic gain control (AGC) signaling are provided. According to one aspect of the present disclosure, a method of wireless communication performed by a user equipment (UE) includes: receiving a signal indicating an automatic gain control (AGC) reference signal resource from a base station (BS), wherein the AGC reference signal resource includes at least a first symbol of a time slot associated with scheduled downlink (DL) communication; receiving the scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; and performing AGC on the scheduled DL communication based on the AGC reference signal.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of U.S. patent application No. 17 / 559,044, filed on December 22, 2021, the disclosure of which is incorporated herein by reference in its entirety as if fully set forth below and for all applicable purposes. Technical Field

[0003] The following relates generally to wireless communications and, more particularly, to the use of reference signals for automatic gain control (AGC). Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless multiple-access communication system may include several base stations (BSs), each of which simultaneously supports communication for multiple communication devices (e.g., user equipment (UE)).

[0005] To meet the growing demand for expanded mobile broadband connectivity, wireless communication technology is evolving from Long Term Evolution (LTE) technology to the next generation New Radio (NR) technology, which may be referred to as fifth generation (5G). For example, NR is designed to provide lower latency, higher bandwidth or higher throughput, and higher reliability compared to LTE. NR is designed to operate on a wide array of frequency bands, for example, from low frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz to high frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum.

[0006] Typically, signals in the uplink (UL or reverse link) and signals in the downlink (DL or forward link) are transmitted in different frequency bands (e.g., through frequency domain duplexing (FDD)) or in the same frequency band but in different time slots (e.g., through time domain duplexing (TDD)). This approach of separating UL and DL transmissions is known as half-duplex (HD) communication. The separation of signals in the frequency or time domain eliminates the possibility of a strong transmit signal from a user drowning out a weak signal received by the same user. Recently, with technological improvements in interference cancellation techniques, true radio-grade full-duplex communication has become feasible, where two-way communication occurs simultaneously between devices using a single frequency channel. As the demand for mobile broadband access continues to increase, research and development continue to drive wireless communication technologies to not only meet the growing demand for mobile broadband access, but also to improve and enhance the user experience. Summary of the Invention

[0007] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not an exhaustive overview of all anticipated features of the present disclosure and is not intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to delineate the scope of any or all aspects of the present disclosure. Its sole purpose is to provide some concepts of one or more aspects of the present disclosure in a summarized form as a prelude to the more detailed embodiments presented later.

[0008] According to one aspect of the present disclosure, a method of wireless communication performed by a user equipment (UE) includes: receiving a signal indicating an automatic gain control (AGC) reference signal resource from a base station (BS), wherein the AGC reference signal resource includes at least a first codeword of a time slot associated with scheduled downlink (DL) communication; receiving the scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; and performing AGC on the scheduled DL communication based on the AGC reference signal.

[0009] According to another aspect of the present disclosure, a method for wireless communication performed by a base station (BS) includes: transmitting a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE), wherein the AGC reference signal resource includes at least a first codeword of a time slot associated with scheduled uplink (UL) communication; receiving the scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource; and performing AGC on the scheduled UL communication based on the AGC reference signal.

[0010] According to another aspect of the present disclosure, a user equipment (UE) includes: a transceiver; and a processor that communicates with the transceiver so that the transceiver and the processor are configured to: receive a signal indicating an automatic gain control (AGC) reference signal resource from a base station (BS), wherein the AGC reference signal resource includes at least a first codeword of a time slot associated with scheduled downlink (DL) communication; receive the scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; and perform AGC on the scheduled DL communication based on the AGC reference signal.

[0011] According to another aspect of the present disclosure, a base station (BS) includes: a transceiver; and a processor that communicates with the transceiver such that the transceiver and the processor are configured to: transmit a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE), wherein the AGC reference signal resource includes at least a first codeword of a time slot associated with scheduled uplink (UL) communication; receive the scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource; and perform AGC on the scheduled UL communication based on the AGC reference signal.

[0012] After reading the description of the following specific, exemplary embodiments in conjunction with the accompanying drawings, other aspects, features and embodiments will become apparent to those of ordinary skill in the art. Although features may be discussed with respect to certain embodiments and figures below, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more of such features may also be used according to the various embodiments discussed herein. In a similar manner, although exemplary embodiments may be discussed below as device, system or method embodiments, it should be understood that these exemplary embodiments may be implemented in various devices, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A wireless communication network according to some aspects of the present disclosure is illustrated.

[0014] Figure 2 A radio frame structure according to some aspects of the present disclosure is illustrated.

[0015] Figure 3 A wireless communication network including one or more devices experiencing interference is illustrated in accordance with some aspects of the present disclosure.

[0016] Figure 4 is a diagram illustrating a signal processing circuit according to some aspects of the present disclosure.

[0017] Figure 5A A resource grid including automatic gain control (AGC) reference signal resources according to some aspects of the present disclosure is illustrated.

[0018] Figure 5B A resource grid including automatic gain control (AGC) reference signal resources according to some aspects of the present disclosure is illustrated.

[0019] Figure 6 is a signaling diagram illustrating a method of wireless communication according to some aspects of the present disclosure.

[0020] Figure 7 is a signaling diagram illustrating a method of wireless communication according to some aspects of the present disclosure.

[0021] Figure 8 is a signaling diagram illustrating a method of wireless communication according to some aspects of the present disclosure.

[0022] Figure 9 is a block diagram of an exemplary base station (BS) according to aspects of the present disclosure.

[0023] Figure 10 is a block diagram of an example user equipment (UE) according to some aspects of the present disclosure.

[0024] Figure 11 A flow chart illustrating a method of wireless communication according to some aspects of the present disclosure is shown.

[0025] Figure 12 A flow chart illustrating a method of wireless communication according to some aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0026] The specific embodiments described below in conjunction with the accompanying drawings are intended to serve as descriptions of various configurations and are not intended to represent the only configurations with which the concepts described herein can be practiced. In order to provide a comprehensive understanding of the various concepts, the specific embodiments include specific details. However, it is apparent to those skilled in the art that these concepts can be practiced without these specific details. In some cases, in order to avoid ambiguity in such concepts, known structures and components are shown in block diagram form.

[0027] The present disclosure as a whole relates to wireless communication systems, which are also referred to as wireless communication networks. In various embodiments, various technologies and devices can 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, global system for mobile communications (GSM) networks, fifth generation (5G) or new radio (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0028] OFDMA networks can implement radio technologies such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA, and GSM are part of the Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization called the "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization called the "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between a group of telecommunications associations whose goal is to define a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the UMTS mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure relates to the evolution from LTE, 4G, 5G, NR, and beyond wireless technologies, where access to wireless spectrum is shared between networks using a range of new and different radio access technologies or radio air interfaces.

[0029] Specifically, 5G networks consider a variety of deployments, a variety of spectrums, and a variety of services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to (1) networks with ultra-high density (e.g., about 1M nodes / km) 2 (1) provide coverage for the massive Internet of Things (IoT) with ultra-low complexity (e.g., on the order of tens of bits / second), ultra-low energy (e.g., on the order of 10+ years battery life), and deep coverage with the ability to reach challenging locations; (2) provide coverage including mission-critical control with strong security to protect sensitive personal, financial, or classified information, ultra-high reliability (e.g., on the order of 99.9999% reliability), ultra-low latency (e.g., on the order of 1 ms), and for users with extensive mobility or lack of mobility; and (3) provide coverage with enhanced mobile broadband (including very high capacity (e.g., on the order of 10 Tbps / km 2 ), coverage of very high data rates (e.g., multi-Gbps rates, 100+Mbps user experienced rates), and deep awareness with advanced discovery and optimization).

[0030] The 5G NR communication system can be implemented using an optimized OFDM-based waveform with a scalable parameter set and transmit time interval (TTI). Additional technical features may also include a common, flexible framework to efficiently multiplex services and features using dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel decoding, and device-centric mobility. The scalability of the parameter set in 5G NR and the scaling of the subcarrier spacing can effectively address the operation of various services across different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing can appear at 15kHz on bandwidths (BWs) such as 5MHz, 10MHz, and 20MHz. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing can appear at 30kHz on 80 / 100MHz BWs. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing may occur at 60 kHz over 160 MHz BW. Finally, for various deployments transmitting with the mmWave component at 28 GHz TDD, subcarrier spacing may occur at 120 kHz over 500 MHz BW. In some aspects, 5G NR may be described as operating in two frequency ranges: FR1, which includes frequency bands around 7 GHz and lower (e.g., 410 MHz to 7125 MHz); and FR2, which includes frequency bands between approximately 24.25 GHz and approximately 52.6 GHz (which may be referred to as millimeter wave).

[0031] 5G NR's scalable parameter set facilitates scalable TTI for different latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start on symbol boundaries. 5G NR also envisions a self-contained integrated subframe design with UL / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL / downlink (which can be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet current traffic needs).

[0032] The various other aspects and features of the present disclosure are further described below. It should be apparent that the teachings herein can be embodied in various forms, and any specific structure, function, or both disclosed herein are merely representative and not restrictive. Based on the teachings herein, it should be understood by those of ordinary skill in the art that the aspects disclosed herein can be implemented independently of any other aspects, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, such a device can be implemented, or such a method can be implemented, using other structures, functions, or structures and functions other than or different from one or more of the aspects set forth herein. For example, the method can 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. In addition, an aspect can include at least one element of a claim.

[0033] As mentioned above, wireless communication devices can use duplexing schemes to separate DL and UL communications. Duplexing schemes include FDD (DL / UL communications on different frequency bands), TDD (DL / UL communications in different time windows), or half-duplex (DL / UL communications separated in frequency and time). Recently, with technological improvements in interference cancellation techniques, true radio-grade full-duplex (FD) communication has become feasible, in which bidirectional communication occurs simultaneously between devices using a single frequency channel. The benefits of FD communication include reduced latency and increased throughput. For example, simultaneous DL / UL communication capabilities can reduce potential DL / UL contention and, therefore, reduce communication latency, particularly in asymmetric links. In addition, FD communication can allow for increased throughput without having to change the modulation and coding scheme (MCS). For example, in FR2 and FR2+ frequencies, meeting the signal-to-noise ratio (SNR) criteria to use a higher-throughput MCS (such as 4096QAM) can be challenging or impractical. Therefore, compared to FDD or TDD communication schemes, even using the same MCS, FD communication can increase data throughput by two times.

[0034] There are challenges associated with FD communications. One challenge facing FD communications is to manage and reduce interference from the same node (self-interference) or interference from different nodes (cross-interference). Whether in FD communications, FDD communications or TDD communications, beam management techniques, antenna isolation and / or analog / digital interference cancellation can be used to manage or mitigate interference. For FD communications, the management of self-interference is particularly challenging. In addition, device mobility may pose additional challenges to FD interference management techniques such as digital / analog cancellation (e.g., digital interference cancellation (DIC)). For example, wireless communication devices such as BS or UE can use automatic gain control (AGC) to dynamically adjust the received signal gain to adapt to changes in signal strength over time due to changing device-to-device distance and / or changing communication medium characteristics. Appropriate AGC settings (e.g., gain states) can facilitate appropriate interference cancellation / reduction. On the other hand, incorrect AGC settings may degrade interference cancellation techniques.

[0035] In some cases, AGC can be implemented using a two-loop mechanism: an outer loop and an inner loop. The outer loop can control the gain state of the low-noise amplifier (LNA) in the RF (i.e., by increasing or decreasing the amplifier gain). The LNA gain state can compensate for coarse gain variations. Conversely, the inner loop can estimate and adjust the digital variable gain control (DVGA) to maintain a constant set point for signal power at the demodulator input. In relatively static environments, the receive antenna can use an AGC setting that is predicted and used by the LNA to adapt to changes in signal strength. If the gain setting / state is within a suitable range, so that the LNA output is not saturated and is above the noise floor, the wireless communication device can use digital interference cancellation (DIC), for example, to address self-interference and / or cross-interference. However, in more dynamic environments, more erratic signal power variations may cause the LNA to saturate. If the LNA saturates, the ability of wireless communications to use digital / analog cancellation for interference may be hampered, sub-band full-duplex (SBFD) orthogonality may be limited, and unnecessary bias may be introduced into Reference Signal Strength Indicator (RSSI) / Reference Signal Received Power (RSRP) measurements. In other words, current techniques for AGC may not be able to resolve rapid changes in signal power quickly enough to prevent LNA saturation. For example, LNA saturation may further reduce the ability of wireless communications devices to resolve signal interference using DIC.

[0036] The present disclosure provides schemes and mechanisms for facilitating AGC gain state selection in FD communications using dedicated reference signaling. In some aspects, a wireless communication device may be configured with dedicated reference signal (RS) resources associated with FD communications. When FD communications are scheduled in a time slot, the wireless communication device may be triggered or commanded to activate a dedicated RS. Dedicated RS resources may include the first codeword of the time slot to allow for rapid updates to the gain state and / or gain settings for the AGC. For example, a rapid update may include an update to the gain state or other AGC settings that may be formed hierarchically within the time slot. For example, a dedicated RS in the first codeword of a time slot may be used to update the LNA gain state, which is used to digitally sample the remaining codewords of the time slot. The dedicated RS may be a repetition of the immediately following (second) codeword, or a different signal based on a known pilot that is similar or identical to the RS used for RSSI, RSRP, and / or SNR calculations. The dedicated RS may occupy one, two, three, or any other suitable number of codewords. In some aspects, the dedicated RS may be referred to as an AGC-RS. In some aspects, AGC-RS resources can be semi-statically configured by radio resource control (RRC) signaling and / or medium access control (MAC) information elements (IEs). In other aspects, AGC-RS resources can be dynamically activated using control layer signaling (e.g., downlink control information (DCI)). In some aspects, AGC-RS resources can be configured using broadcast signaling (e.g., physical broadcast channel (PBCH)).

[0037] The dedicated RS may be triggered or activated based on one or more criteria. For example, in some aspects, the dedicated RS may be triggered or activated based on MCS, rank, SNR, and / or CQI reporting. In other aspects, the dedicated RS may be triggered or activated based on the mobility of the wireless communication device.

[0038] A wireless communication device may perform AGC based on a dedicated RS. For example, a wireless communication device may use a dedicated RS in the outer loop of the above-mentioned AGC. Dedicated RS may be used to replace or assist SBS, tracking reference signal (TRS) and / or physical downlink shared channel (PDSCH) resources. The techniques and mechanisms described herein may be employed by a BS, UE and / or any other wireless node. For example, a BS may configure dedicated RS resources for UE AGC and / or may request that a UE transmit an RS that may be used by the BS for AGC.

[0039] The AGC techniques disclosed herein can provide updated LNA gain states, which can increase the chances of correctly decoding signals in dynamic environments. Consequently, the mechanisms and devices described herein advantageously increase data throughput and reduce communication failures in dynamic environments. This improves the user experience. These advantages may be particularly significant for FD communications, which may experience self-interference in some environments.

[0040] Figure 1 A wireless communication network 100 according to some aspects of the present disclosure is illustrated. The network 100 may be a 5G network. The network 100 includes several base stations (BSs) 105 (labeled 105a, 105b, 105c, 105d, 105e, and 105f, respectively) and other network entities. The BSs 105 may be stations that communicate with the UEs 115 and may also be referred to as: evolved Node Bs (eNBs), next generation eNBs (gNBs), access points, etc. Each BS 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to that particular geographic coverage area of the BS 105 and / or a BS subsystem serving that coverage area, depending on the context in which the term is used.

[0041] BS105 can provide communication coverage for macro cells or small cells (such as pico cells or femto cells), and / or other types of cells. Macro cells generally cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions with the network provider. Small cells (such as pico cells) will generally cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions with the network provider. Small cells (such as femto cells) will generally also cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, can also provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, pico BS, femto BS, or home BS. In Figure 1 In the example shown, BSs 105d and 105e may be conventional macro BSs, while BSs 105a-105c may be macro BSs capable of one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. BSs 105a-105c may utilize their higher-dimensional MIMO capabilities to utilize 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. BS 105f may be a small cell BS, which may be a home node or a portable access point. BS 105 may support one or more (e.g., two, three, four, etc.) cells.

[0042] Network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

[0043] UEs 115 are dispersed throughout wireless network 100, and each UE 115 may be stationary or mobile. UEs 115 may also be referred to as terminals, mobile stations, subscriber units, stations, and the like. UEs 115 may be cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, tablet computers, laptop computers, cordless phones, wireless local loop (WLL) stations, and the like. In one aspect, UEs 115 may be devices that include a Universal Integrated Circuit Card (UICC). In another aspect, UEs may be devices that do not include a UICC. In some aspects, UEs 115 that do not include a UICC may also be referred to as IoT devices or Internet of Everything (IoE) devices. UEs 115a-115d are examples of mobile smartphone-type devices that access network 100. UEs 115 may also be machines specifically configured for connected communications, including machine-type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), and the like. UEs 115e-115h are examples of various machines configured for communication to access network 100. UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication to access network 100. UE 115 may be able to communicate with any type of BS, whether macro BS, small cell, etc. Figure 1 , lightning (e.g., communication link) indicates wireless transmission between UE 115 and serving BS 105 (which is a BS designated to serve UE 115 on downlink (DL) and / or uplink (UL)), desired transmission between BSs 105, backhaul transmission between BSs, or sidelink transmission between UE 115.

[0044] In operation, BSs 105a-105c use 3D beamforming and collaborative spatial techniques (such as coordinated multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro BS 105d can perform backhaul communications with BSs 105a-105c and small cell BS 105f. Macro BS 105d can also transmit multicast services that can be subscribed to and received by UEs 115c and 115d. Such multicast services can include mobile TV or streaming video, or can include other services for providing community information, such as weather emergencies or alerts, such as Amber Alerts or Gray Alerts.

[0045] The BSs 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the BSs 105 (e.g., which may be examples of gNBs or access node controllers (ANCs)) may interface with the core network via a backhaul link (e.g., NG-C, NG-U, etc.) and may perform radio configuration and scheduling for communications with the UEs 115. In various examples, the BSs 105 may communicate with each other directly or indirectly (e.g., through the core network) over a backhaul link (e.g., X1, X2, etc.), which may be a wired or wireless communication link.

[0046] The network 100 may also support mission-critical communications with ultra-reliable and redundant links for mission-critical devices (e.g., UE 115e, which may be a drone). The redundant communication links with UE 115e may include links from macro BSs 105d and 105e, as well as a link from small cell BS 105f. Other machine-type devices, such as UE 115f (e.g., a thermometer), UE 115g (e.g., a smart meter), and UE 115h (e.g., a wearable device), may communicate directly with BSs such as small cell BS 105f and macro BS 105e over the network 100, or communicate with another user device, such as UE 115f, which communicates temperature measurement information to a smart meter (UE 115g), which then reports to the network via small cell BS 105f, in a multi-hop configuration. The network 100 may also provide additional network efficiency through dynamic low-latency TDD / FDD communications, such as V2V, V2X, C-V2X communications between UE 115i, 115j, or 115k and other UEs 115 and / or vehicle-to-infrastructure (V2I) communications between UE 115i, 115j, or 115k and BS 105.

[0047] In some implementations, network 100 utilizes an OFDM-based waveform for communication. An OFDM-based system can divide the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, frequency tones, frequency bins, etc. Each subcarrier can be modulated with data. In some instances, the subcarrier spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system BW. The system BW can also be divided into subbands. In other instances, the subcarrier spacing and / or the duration of the TTI can be scalable.

[0048] In some aspects, BS 105 may assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) and uplink (UL) transmissions in network 100. DL refers to the transmission direction from BS 105 to UE 115, while UL refers to the transmission direction from UE 115 to BS 105. The communication may be in the form of a radio frame. A radio frame may be divided into a plurality of subframes or time slots, e.g., approximately 10. Each time slot may be further divided into micro-slots. In FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL band and a DL subframe in a DL band. In TDD mode, UL and DL transmissions occur in different time periods using the same frequency band. For example, a subset of subframes in a radio frame (e.g., a DL subframe) may be used for DL transmission, and another subset of subframes in a radio frame (e.g., a UL subframe) may be used for UL transmission.

[0049] DL subframes and UL subframes can also be divided into several areas. For example, each DL or UL subframe can have a predefined area for transmitting reference signals, control information and data. A reference signal is a predetermined signal that facilitates communication between BS105 and UE 115. For example, a reference signal can have a specific pilot pattern or structure, wherein the pilot tone can span an operational BW or frequency band, and each pilot tone is located at a predefined time and a predefined frequency. For example, BS105 can transmit a cell-specific reference signal (CRS) and / or a channel state information-reference signal (CSI-RS) to enable UE 115 to estimate the DL channel. Similarly, UE 115 can transmit a sounding reference signal (SRS) to enable BS105 to estimate the UL channel. Control information can include resource assignments and protocol control. Data can include protocol data and / or operational data. In some aspects, BS105 and UE 115 can communicate using self-contained subframes. A self-contained subframe can include a portion for DL communication and a portion for UL communication. A self-contained subframe may be DL-centric or UL-centric. A DL-centric subframe may include a duration longer than that used for DL communication. A UL-centric subframe may include a duration longer than that used for UL communication.

[0050] In some aspects, network 100 may be an NR network deployed on a licensed spectrum. BS 105 may transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in network 100 to facilitate synchronization. BS 105 may broadcast system information associated with network 100 (e.g., including a master information block (MIB), residual system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some instances, BS 105 may broadcast the PSS, SSS, and / or MIB in the form of synchronization signal blocks (SSBs) over a physical broadcast channel (PBCH), and may broadcast the RMSI and / or OSI over a physical downlink shared channel (PDSCH).

[0051] In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting the PSS from the BS 105. The PSS may enable synchronization of period timing and may indicate a physical layer identification value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identification value that may be combined with the physical layer identification value to identify the cell. The PSS and SSS may be located in the center portion of the carrier or at any suitable frequency within the carrier.

[0052] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESETs) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.

[0053] After obtaining the MIB, RMSI, and / or OSI, UE 115 may perform a random access procedure to establish a connection with BS 105. In some examples, the random access procedure may be a four-step random access procedure. For example, UE 115 may transmit a random access preamble, and BS 105 may respond with a random access response. The random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, an UL grant, a temporary cell radio network temporary identifier (C-RNTI), and / or a backoff indicator. Upon receiving the random access response, UE 115 may transmit a connection request to BS 105, and BS 105 may respond with a connection response. The connection response may indicate contention resolution. In some examples, the random access preamble, RAR, connection request, and connection response may be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission, and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.

[0054] After establishing the connection, the UE 115 and the BS 105 may enter a normal operation phase in which operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and / or DL communications. The BS 105 may transmit an UL and / or DL scheduling grant to the UE 115 via the PDCCH. The scheduling grant may be transmitted in the form of DL control information (DCI). The BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via the PDSCH based on the DL scheduling grant. The UE 115 may transmit an UL communication signal to the BS 105 via the PUSCH and / or PUCCH based on the UL scheduling grant.

[0055] In some aspects, the network 100 may operate on a system BW or a component carrier (CC) BW. The network 100 may divide the system BW into multiple BWPs (e.g., portions). The BS 105 may dynamically assign the UE 115 to operate on a specific BWP (e.g., a specific portion of the system BW). The assigned BWP may be referred to as an active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 to conduct UL or DL communications in the active BWP. In some aspects, the BS 105 may assign a pair of BWPs within a CC to the UE 115 for UL and DL communications. For example, the BWP pair may include one BWP for UL communications and one BWP for DL communications.

[0056] In some aspects, network 100 may support full-duplex (FD), half-duplex (HD), and or any other type of duplex communication to increase data throughput.

[0057] Figure 2 1 illustrates a radio frame structure 200 according to some aspects of the present disclosure. Radio frame structure 200 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100) for communication. Specifically, the BS may communicate with the UE using the time-frequency resources configured as shown in radio frame structure 200. Figure 2 In FIG. 2 , the x-axis represents time in some arbitrary units, and the y-axis represents frequency in some arbitrary units. Transmit frame structure 200 includes radio frame 201. The duration of radio frame 201 may vary depending on various aspects. In one example, radio frame 201 may have a duration of approximately ten milliseconds. Radio frame 201 includes M time slots 202, where M may be any suitable positive integer. In one example, M may be approximately 10.

[0058] Each time slot 202 includes a number of subcarriers 204 in frequency and a number of symbols 206 in time. The number of subcarriers 204 and / or the number of symbols 206 in a time slot 202 may vary depending on various aspects (e.g., based on the channel BW, subcarrier spacing (SCS), and / or CP mode). One subcarrier 204 in frequency and one symbol 206 in time form one resource element (RE) 212 for transmission. A resource block (RB) 210 is formed by a number of consecutive subcarriers 204 in frequency and a number of consecutive symbols 206 in time.

[0059] In one example, a BS (e.g., Figure 1 The BS 105 in the embodiment may schedule the UE (e.g., Figure 1 1) for UL and / or DL communications with a UE 115 in the UE 115. Each time slot 202 may be time-divided into K mini-slots 208. Each mini-slot 208 may include one or more symbols 206. The mini-slots 208 in a time slot 202 may have variable lengths. For example, when a time slot 202 includes N symbols 206, a mini-slot 208 may have a length between one symbol 206 and (N-1) symbols 206. In some aspects, a mini-slot 208 may have a length of approximately two symbols 206, approximately four symbols 206, or approximately seven symbols 206. In some examples, the BS may schedule UEs at a frequency granularity of a resource block (RB) 210 (e.g., which includes approximately 12 subcarriers 204).

[0060] Figure 3is a diagram illustrating different types of interference in a wireless communication scheme 300 according to aspects of the present disclosure. In some aspects, Figure 3 The diagram illustrates self-interference caused by an aggressor node operating in a full-duplex (FD) communication configuration, as well as cross-interference between an aggressor UE 315a and a victim UE 315b. In FD mode, the aggressor UE 315a can be configured to simultaneously transmit and receive communication signals on the same frequency band. In half-duplex (HD) mode, the UE is configured to transmit and receive communication signals on different frequency bands. In FD mode, the aggressor UE 315a transmits communication signals using an aggressor Tx node 312 and receives communication signals using an aggressor Rx node 310. The aggressor Tx node 312 can include a first antenna or antenna array, and the aggressor Rx node 310 can include a second antenna or antenna array. The antennas of nodes 310 and 312 can be isolated from each other. The aggressor Tx node 312 can be configured to use directional beamforming to create a beam 304 directed toward the BS 305. Similarly, BS 305 can be configured to maintain a communication link 320 with an aggressor UE 315a using directional beamforming. In some aspects, the beam 304 generated by the aggressor Tx node 312 can include one or more side lobes 303. The side lobes 303 can travel in a tangential direction. In some aspects, the signal energy from one of the side lobes 303 can cause interference to the victim UE 315b. This type of interference can be referred to as cross interference. If the aggressor UE 315a is a mobile device (e.g., a smartphone), the interference caused by such side lobes can be highly dynamic.

[0061] In some instances, a reflector 302 in the cell area can reflect signal energy 306 from beam 304 toward the aggressor Rx node 310 of the aggressor UE 315a. Therefore, because the aggressor UE 315a operates in FD mode, the aggressor Rx node 310 may experience interference in the same frequency band. This type of interference cannot be eliminated by bandpass filtering. In some aspects, the reflector 302 can be a moving, dynamic obstacle, such as a vehicle in an urban environment. These types of reflectors 302 can cause highly dynamic, rapid changes in the signal energy received by the Rx node 310 and / or the victim UE 315b. This interference can be particularly problematic for FD communications. For example, rapid changes in received signal energy caused by dynamic reflectors, sidelobes from neighboring aggressor UEs, and / or any other type of interfering device can cause saturation of the low-noise amplifier (LNA), which can inhibit the UE's ability to digitize or digitally sample the signal during the time slot until the LNA's gain state can be updated.

[0062] Figure 4is a schematic diagram of a digital sampling circuit 400 of a wireless communication device according to aspects of the present disclosure. Figure 4 The digital sampling circuit 400 shown in FIG4 may be included in a UE, a BS, a relay device, and / or any other suitable wireless communication device. The digital sampling circuit 400 may be configured to receive analog signal energy from an antenna or an antenna array, convert the analog signal into a digital signal, and pass the digital signal to other components of a signal processing chain, such as an analog division multiplexing (MDM) circuit.

[0063] Circuit 400 includes a low-noise amplifier (LNA) 402 configured to receive a radio frequency (RF) signal from an antenna or antenna array. LNA 402 is configured to amplify the received signal based on a gain state. The gain state may be determined or provided by automatic gain control (AGC) circuitry 410. AGC 410 is configured to determine the gain state used by LNA 402 to amplify these signals based on signals provided by digital front end 408 and / or other parts of the processing chain. In some aspects, AGC 410 is configured to determine a reference signal strength indicator (RSSI) and determine an updated gain state based on the RSSI. AGC 410 may determine the RSSI based on a synchronization signal block (SSB), a tracking reference signal (TRS), PDSCH resources, and / or PUSCH resources. The amplified signal from LNA 402 is passed to analog front end circuitry 404. Analog front end circuitry 404 may include filters, oscillators, and / or other circuitry to prepare the amplified signal for digitization by ADS 406 and digital front end circuitry 408.

[0064] In some aspects, the gain state of LNA 402 may not be set correctly to saturate the amplified signal from LNA 402. This may be caused by dynamic or rapidly changing interference in the environment. For example, reflectors (such as vehicles in an urban environment) can quickly and instantaneously increase the amount of interference at the receiving device. This interference may include cross-interference or self-interference, as discussed above with respect to Figure 3 Managing interference can be particularly challenging for full-duplex communications where a wireless communication device simultaneously transmits and receives signals on the same frequency band. In some aspects, if a signal is saturated, the ability of the wireless communication device to cancel or compensate for interference may be limited. In some instances, a saturated signal from the LNA 402 may prevent a receiving device from decoding the communication. One factor causing an incorrect LNA gain state is the relatively sparse periodicity of the reference signals (e.g., SSB, TRS) used to update the LNA gain state. The relatively large periodicity of these signals may limit the ability of the LNA gain state to be updated quickly enough to account for sudden power changes due to cross-interference and / or self-interference.

[0065] This disclosure describes schemes, mechanisms, and devices for activating AGC reference signal resources for downlink (DL) and / or uplink (UL) communications, enabling more responsive gain state updates. For example, a wireless communication device, such as a base station (BS), may activate AGC reference signal resources that include at least the first symbol of a time slot associated with a scheduled communication. The BS may transmit or receive the scheduled communication, wherein at least the first symbol includes one or more AGC reference signals. For example, if the communication is a downlink (DL) communication, the UE may perform AGC based on the AGC reference signals in the reference signal resources and process the remaining symbols of the time slot using an updated LNA gain state determined based on the AGC.

[0066] Figure 5A and Figure 5B is a diagram illustrating a resource grid 500 including allocation of AGC reference signal resources according to aspects of the present disclosure. It should be understood that Figure 5A and Figure 5B The allocations illustrated in can be used for DL communication, UL communication, SL communication and / or any other suitable type of communication. In addition, it should be understood that Figure 5A and Figure 5B The allocation shown in is exemplary, and the present disclosure contemplates various assumptions on the allocation of AGC reference signal resources, including the number of symbols and the density of AGC reference signal resources in the frequency domain.

[0067] refer to Figure 5A , shows a time / frequency resource grid 500a spanning a time slot 502 having 14 codewords (including a first codeword 506). The grid 500a also shows 12 subcarriers in the frequency domain. These 12 subcarriers collectively form a resource block (RB) 504. The resource grid 500a can represent an allocation for DL communication and / or UL communication. However, in some aspects, the resource grid can be used for SL communication or any other suitable type of communication. In an exemplary embodiment, the resource grid 500a corresponds to a shared data channel, such as a PDSCH or PUSCH. The resource grid 500a includes an AGC reference signal 520 in the first codeword 506 and in each subcarrier of the RB 504. The remaining resource elements (REs) in the grid 500a include data REs (such as PDSCH or PUSCH REs 510) and DMRS resources 530. Figure 5AIn the example shown, the AGC reference signal includes a repetition or copy of the immediately following symbol for each subcarrier in the PDSCH / PUSCH RE. However, in other aspects, the AGC reference signal may include other types of reference signals, such as reference signals based on known pilots. For example, the AGC reference signal 520 may be similar to or the same as a DMRS signal, a CSI reference signal, a phase tracking reference signal, a tracking reference signal, and / or any other suitable type of signal.

[0068] refer to Figure 5B , resource grid 500b includes an AGC reference signal 520 in the first two symbols 508 of time slot 502. Thus, the AGC reference signal resources are contiguous and include the first symbol 506 of time slot 502. The AGC reference signal resources are distributed across RB 504 to include two AGCs, one for every six subcarriers. In other aspects, other frequency densities may be used. For example, an AGC reference signal resource may be allocated for every subcarrier, every other subcarrier, every third, fourth, or fifth subcarrier, etc. In some aspects, a single AGC reference signal resource for RB 504 may be provided in one of the subcarriers.

[0069] Can be modified in one or more ways Figure 5A and Figure 5B , without departing from the scope of the present disclosure. For example, it should be understood that the number of symbols of the AGC reference signal can be one, two, three, four, and / or any other suitable number of symbols. Thus, the AGC reference signal can include a first symbol and a second symbol, a third symbol, and / or a fourth symbol, and so on. Furthermore, in some aspects, other reference signals and / or data REs can be allocated within the first symbol and / or the second symbol. In some aspects, the resource grid 500 can include more than Figure 5A For example, the last two, three, or four symbols of slot 502 may include null symbols for one or more subcarriers of RB 504.

[0070] Figure 66 is a signaling diagram illustrating a wireless communication method 600 for activating and transmitting AGC reference signal resources according to aspects of the present disclosure. Method 600 is performed by a UE 615 and a BS 605. UE 615 605 may be one of UEs 115 in network 100, and BS 605 may be one of BSs 105 in network 100. Furthermore, UE 615 may include UE 615 1000, described below. Similarly, BS 605 may include BS 605 900, described below. As illustrated, method 600 includes several of the enumerated steps, although aspects of method 600 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order. In method 600, BS 605 may activate AGC reference signal resources based on the occurrence of one or more triggering conditions.

[0071] At action 602, BS 605 transmits and UE 615 receives an automatic gain control (AGC) reference signal configuration. Action 602 may include BS 605 transmitting a control signal indicating the AGC reference signal configuration. In some aspects, the control signal may include an RRC message or an RRC configuration. In other aspects, the control signal may include a MAC information element and / or a MAC control element (MAC-CE). The AGC reference signal configuration may indicate the time resources and frequency resources used for the AGC reference signal, including the first codeword of a time slot associated with a scheduled DL communication or UL communication. For example, the AGC reference signal configuration may indicate the number of codewords allocated for the AGC reference signal. The number of codewords allocated for the AGC reference signal may be one, two, three, and / or any other suitable number of codewords. In some aspects, the AGC reference signal configuration may indicate other parameters or characteristics of the AGC reference signal, such as a signal type. For example, the AGC reference signal configuration may indicate that the AGC reference signal is a copy or replication of the immediately following codeword. For another example, the AGC reference signal configuration may indicate a pilot signal so that the UE 615 can use the AGC reference signal to perform RSRP and / or SNR calculations. In some aspects, the AGC reference signal configuration may indicate the periodicity of the AGC reference signal. For example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated once every n time slots. For another example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated semi-persistently. For example, the AGC reference signal configuration may indicate that a first AGC reference signal resource is allocated in a first time slot with x repetitions and every y time slots. In other aspects, the AGC reference signal configuration and / or signal characteristics may be pre-configured at the UE.

[0072] At action 604, BS 605 monitors and detects one or more trigger conditions for activating AGC reference signal resources. The trigger conditions may be associated with communication conditions for which it is beneficial for UE 615 to sample, digitize, and / or otherwise process DL communications from BS 605 using AGC reference signal resources. For example, the trigger conditions used by BS 605 to activate AGC reference signal resources may include a modulation and coding scheme (MCS) configured for DL communications and / or UL communications between BS 605 and UE 615. For example, if BS 605 determines to use an MCS of n, BS 605 may determine to activate AGC reference signal resources for DL communications to UE 615. For example, for higher MCSs (e.g., 128QAM, 256QAM, etc.), BS 605 may activate AGC reference signal resources for DL communications and / or UL communications. In some aspects, the activation of the AGC reference signal resources may be implicitly indicated to UE 615 based on the MCS of the scheduled communications. For example, the UE 615 may be configured with a table that associates MCS values with AGC reference signal states (e.g., whether the AGC reference signal is activated / deactivated). In some aspects, the MCS value may be associated with a number of AGC reference signal symbols activated for DL communication and / or UL communication. For example, the UE 615 may determine a number of symbols (e.g., one, two, three, etc.) allocated for the AGC reference signal in a time slot based on the MCS value.

[0073] As another example, the triggering condition may include the UE's priority level, signal-to-noise ratio (SNR), spectral efficiency, and / or reported CQI. For example, the UE 615 may transmit a periodic report indicating the SNR, priority level, spectral efficiency, and / or CQI to the BS 605. If the BS 605 determines that any of these parameters does not meet a configured threshold, the BS 605 may determine to activate the AGC reference signal resources. As another example, the triggering condition may include the mobility of the UE 615. For example, in some aspects, the method 600 may include the UE 615 transmitting and the BS 605 receiving a CLI report including a mobility indicator (MI) associated with the UE 615. If the MI exceeds a threshold, the BS 605 may determine to activate the AGC reference signal resources. In other aspects, the triggering condition may include data channel type, detected beam switching from a neighboring UE, SRS reception for the CLI report, and / or geographic area. As described above, the triggering conditions can advantageously allow the BS 605 and / or UE 615 to activate AGC reference signal resources under conditions and circumstances where AGC reference signal resources may be more beneficial. On the other hand, if the conditions enable AGC to be performed and the LNA gain state can be updated based on SSB, TRS, and / or PDSCH resources, the BS 605 and / or UE 615 can avoid activating AGC reference signal resources. As a result, the AGC reference signal resources can be sparse and dynamically activated to reduce network costs.

[0074] At action 606, based on one or more trigger conditions detected at action 604, UE 615 receives a signal from BS 605 to activate AGC reference signal resources. The AGC reference signal resources include at least the first code element of the time slot associated with the scheduled downlink (DL) communication. In some embodiments, receiving a signal indicating the AGC reference signal resources includes receiving downlink control information indicating the AGC reference signal resources. For example, the DCI can indicate the activation of the AGC reference signal resources. In some aspects, the DCI can also indicate the time resources and frequency resources associated with the scheduled DL communication. For example, the DCI can carry both DL authorization and AGC reference signal resource activation. In some aspects, the DCI can indicate the time resources and frequency resources associated with the PDSCH.

[0075] In some aspects, AGC reference signal activation is associated with the AGC reference signal configuration transmitted at action 602. The signal transmitted at action 606 and / or the AGC reference signal configuration transmitted at action 602 can be transmitted using dedicated or non-dedicated signaling. For example, AGC reference signal resource activation can be a dedicated DCI transmitted in the PDCCH, or a group-common message (e.g., a DCI transmitted in the group-common PDCCH). As another example, AGC reference signal activation can be a broadcast message transmitted in the PBCH. In some aspects, the AGC reference signal configuration can include or indicate a mapping between different modulation and coding scheme (MCS) values and a number of allocated AGC reference signal symbols. Based on the mapping, the UE 615 can determine whether the allocated AGC reference signal exists and / or whether a number of symbols are allocated for the AGC reference signal in the scheduled DL communication. In this regard, as described above, the activation of the AGC reference signal for the scheduled DL communication can be based on the characteristics of the communication between the BS 605 and the UE 615. In this regard, higher throughput MCS may benefit from faster updates of the LNA gain state to adapt to rapid changes in interference.

[0076] At action 608, BS 605 transmits in the time slot and UE 615 receives the scheduled DL communication, wherein the scheduled DL communication includes the AGC reference signal in the indicated AGC reference signal resource. As described above, the AGC reference signal resource includes at least the first codeword of the time slot associated with the scheduled DL communication. However, in some aspects, the AGC reference signal can be transmitted in more than one codeword. For example, the scheduled DL communication can be transmitted by BS 605 in the time slot, wherein the first, second, or third codewords of the time slot include the AGC reference signal. In some aspects, receiving the AGC reference signal in the AGC reference signal resource includes receiving a copy or repetition of one or more codewords after the AGC reference signal. For example, receiving the AGC reference signal includes receiving a reference signal associated with a known pilot, such as a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a tracking reference signal (TRS), and / or a demodulation reference signal (DMRS).

[0077] In some aspects, the UE 615 may receive a single AGC reference signal in each resource block. In other aspects, more than one AGC reference signal may be received in each resource block. In other aspects, a single AGC reference signal may be received for each carrier frequency. In other aspects, more than one AGC reference signal may be received for each carrier frequency. For example, the UE 615 may receive an AGC reference signal in each subcarrier of each resource block. In some aspects, the UE 615 may use the AGC reference signal to calculate a received signal strength indicator (RSSI), a reference signal received power (RSRP), and / or a signal-to-noise ratio (SNR).

[0078] In some aspects, actions 602 through 608 may be based on a duplex mode of communication between the BS 605 and the UE 615. For example, in some aspects, based on the scheduled DL communication being full-duplex (FD) communication, the BS 605 is configured to transmit an AGC reference signal, and the UE 615 is configured to receive the AGC reference signal. In another aspect, based on the scheduled DL communication being half-duplex (HD) communication, the BS 605 is configured to transmit an AGC reference signal, and the UE 615 is configured to receive the AGC reference signal.

[0079] At act 610, UE 615 performs AGC on the scheduled DL communication based on the AGC reference signal. In some aspects, performing AGC includes determining an RSSI value based on the AGC reference signal. Because the AGC reference signal is located in the first symbol of the time slot, UE 615 can perform AGC to update the gain state of the LNA in the analog front end for at least some of the remaining symbols in the time slot that includes the DL communication. For example, if the AGC reference signal occupies only the first symbol of the time slot, UE 615 can perform AGC to update the LNA gain state to digitize / sample the second symbol and all other remaining symbols of the time slot. For another example, if UE 615 is not configured with an LNA switching time that enables single-symbol gain state updates, the AGC reference signal can occupy the first two, three, four, or any other suitable number of symbols of the time slot, where the symbols allocated to the AGC reference signal are consecutive and include the first symbol. More frequent updates of the LNA gain state can reduce the probability of LNA saturation and increase the probability that the LNA gain state has been correctly set or selected. Therefore, the UE 615 can more efficiently digitize or sample the signal for the remaining symbols in the slot.

[0080] At act 612, the UE 615 digitizes or samples the remaining symbols of the DL communication in the time slot based on the AGC performed at act 610. For example, the LNA of the UE 615 may amplify the RF signal associated with the remaining symbols of the time slot using the updated LNA gain state from the AGC performed based on the AGC reference signal of the first symbol, and pass the amplified signal to the analog front end circuit (e.g., Figure 4 The ADC may then digitally sample the signal and pass it to a digital front-end circuit (e.g., Figure 4 408) for further digital processing.

[0081] Figure 7 6 is a signaling diagram illustrating a wireless communication method 700 for activating and transmitting AGC reference signal resources according to aspects of the present disclosure. Method 700 is performed by UE 615 and BS 605. UE 615 605 may be one of UEs 115 in network 100, and BS 605 may be one of BSs 105 in network 100. Furthermore, UE 615 may include UE 615 1000, described below. Similarly, BS 605 may include BS 605 900, described below. As illustrated, method 700 includes several of the enumerated steps, although aspects of method 700 may include additional steps before, after, or between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order. In method 700, UE 615 may request an AGC reference signal or reference signal resource based on the occurrence of one or more triggering conditions.

[0082] At action 702, the BS 605 transmits and the UE 615 receives an automatic gain control (AGC) reference signal configuration. Action 702 may include the BS 605 transmitting a control signal indicating the AGC reference signal configuration. In some aspects, the control signal may include an RRC message or an RRC configuration. In other aspects, the control signal may include a MAC information element and / or a MAC control element (MAC-CE). The AGC reference signal configuration may indicate the time resources and frequency resources used for the AGC reference signal, including the first codeword of a time slot associated with a scheduled DL communication or UL communication. For example, the AGC reference signal configuration may indicate the number of codewords allocated for the AGC reference signal. The number of codewords allocated for the AGC reference signal may be one, two, three, and / or any other suitable number of codewords. In some aspects, the AGC reference signal configuration may indicate other parameters or characteristics of the AGC reference signal, such as a signal type. For example, the AGC reference signal configuration may indicate that the AGC reference signal is a copy or replication of the immediately following codeword. For another example, the AGC reference signal configuration may indicate a pilot signal so that the UE 615 can use the AGC reference signal to perform RSRP and / or SNR calculations. In some aspects, the AGC reference signal configuration may indicate the periodicity of the AGC reference signal. For example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated once every n time slots. For another example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated semi-persistently. For example, the AGC reference signal configuration may indicate that a first AGC reference signal resource is allocated in a first time slot with x repetitions and every y time slots. In other aspects, the AGC reference signal configuration and / or signal characteristics may be pre-configured at the UE.

[0083] At action 704, UE 615 monitors and detects one or more trigger conditions for requesting AGC reference signal resources. The trigger conditions may be associated with communication conditions for which it is beneficial for UE 615 to sample, digitize, and / or otherwise process DL communications from BS 605. For example, the trigger conditions for UE 615 to request AGC reference signal resources may include a modulation and coding scheme (MCS) configured for DL communications and / or UL communications between BS 605 and UE 615. For example, if UE 615 receives DCI indicating an MCS value of n, UE 615 may determine to request AGC reference signal resources for DL communications to UE 615. For example, for higher MCSs (e.g., 128QAM, 256QAM, etc.), UE 615 may request AGC reference signal resources for DL communications and / or UL communications.

[0084] For example, the triggering conditions may include priority level, signal-to-noise ratio (SNR), spectral efficiency, mobility, reported CQI, data channel type, beam switching detected from a neighboring UE, SRS reception for CLI reporting and / or geographic area, as similarly described above with respect to action 604 in method 600.

[0085] At act 706, based on one or more trigger conditions detected at act 704, UE 615 transmits a request for AGC reference signal resources to BS 605. For example, UE 615 may request AGC reference signal resources based on the MCS used by UE 615 and / or BS 605 for DL communication and / or UL communication. For example, UE 615 may be configured with a table that indicates, for each MCS value, whether UE 615 should request AGC reference signal resources and / or a number of symbols to use for AGC reference signal resources. For another example, UE 615 may transmit the request to BS 605 based on the mobility level of UE 615. For example, UE 615 may transmit the request for AGC reference signal resources to BS 605 based on a mobility indicator (MI) associated with UE 615. In some aspects, UE 615 may perform autonomous measurements to estimate characteristics of dynamic clutter reflections and transmit the request for AGC reference signal resources based on the autonomous measurements.

[0086] At action 708, BS 605 transmits a signal to UE 615 to activate AGC reference signal resources. The AGC reference signal resources include at least the first code element of the time slot associated with the scheduled downlink (DL) communication. In some embodiments, receiving a signal indicating the AGC reference signal resources includes receiving downlink control information indicating the AGC reference signal resources. For example, the DCI can indicate the activation of the AGC reference signal resources. In some aspects, the DCI can also indicate the time resources and frequency resources associated with the scheduled DL communication. For example, the DCI can carry both DL authorization and AGC reference signal resource activation. In some aspects, the DCI can indicate the time resources and frequency resources associated with the PDSCH.

[0087] In some aspects, the AGC reference signal activation is associated with the AGC reference signal configuration transmitted at act 702. The signal transmitted at act 708 and / or the AGC reference signal configuration transmitted at act 702 may be transmitted using dedicated or non-dedicated signaling. For example, the AGC reference signal resource activation may be a dedicated DCI transmitted in a PDCCH, or a group-common message (e.g., a DCI transmitted in a group-common PDCCH). For another example, the AGC reference signal activation may be a broadcast message transmitted in a PBCH.

[0088] At action 710, BS 605 transmits in the time slot and UE 615 receives the scheduled DL communication, wherein the scheduled DL communication includes the AGC reference signal requested by UE 615. As described above, the AGC reference signal resource includes at least the first codeword of the time slot associated with the scheduled DL communication. However, in some aspects, the AGC reference signal can be transmitted in more than one codeword. For example, the scheduled DL communication can be transmitted by BS 605 in the time slot, wherein the first, second, or third codewords of the time slot include the AGC reference signal. In some aspects, receiving the AGC reference signal in the AGC reference signal resource includes receiving a copy or repetition of one or more codewords after the AGC reference signal. For another example, receiving the AGC reference signal includes receiving a reference signal associated with a known pilot, such as a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a tracking reference signal (TRS), and / or a demodulation reference signal (DMRS).

[0089] In some aspects, the UE 615 may receive a single AGC reference signal in each resource block. In other aspects, more than one AGC reference signal may be received in each resource block. In other aspects, a single AGC reference signal may be received for each carrier frequency. In other aspects, more than one AGC reference signal may be received for each carrier frequency. For example, the UE 615 may receive an AGC reference signal in each subcarrier of each resource block. In some aspects, the UE 615 may use the AGC reference signal to calculate a received signal strength indicator (RSSI), a reference signal received power (RSRP), and / or a signal-to-noise ratio (SNR).

[0090] It should be understood that in some aspects, BS 605 may not transmit a signal indicating activation of the AGC reference signal resource. For example, BS 605 may transmit a DL communication with the AGC reference signal based on the request. The DL communication with the AGC reference signal may implicitly indicate to UE 615 that AGC has been activated. In some aspects, actions 702 to 710 may be based on the duplex mode of the communication between BS 605 and UE 615. For example, in some aspects, based on the scheduled DL communication being full-duplex (FD) communication, BS 605 is configured to transmit the AGC reference signal, and UE 615 is configured to receive the AGC reference signal. On the other hand, based on the scheduled DL communication being half-duplex (HD) communication, BS 605 is configured to transmit the AGC reference signal, and UE 615 is configured to receive the AGC reference signal.

[0091] At act 712, UE 615 performs AGC on the scheduled DL communication based on the AGC reference signal. In some aspects, performing AGC includes determining an RSSI value based on the AGC reference signal. Because the AGC reference signal is located in the first symbol of the time slot, UE 615 can perform AGC to update the gain state of the LNA in the analog front end for at least some of the remaining symbols in the time slot that includes the DL communication. For example, if the AGC reference signal occupies only the first symbol of the time slot, UE 615 can perform AGC to update the LNA gain state to digitize / sample the second symbol and all other remaining symbols of the time slot. For another example, if UE 615 is not configured with an LNA switching time that enables single-symbol gain state updates, the AGC reference signal can occupy the first two, three, four, or any other suitable number of symbols of the time slot, where the symbols allocated to the AGC reference signal are consecutive and include the first symbol. More frequent updates of the LNA gain state can reduce the probability of LNA saturation and increase the probability that the LNA gain state has been correctly set or selected. Therefore, the UE 615 can more efficiently digitize or sample the signal for the remaining symbols in the slot.

[0092] At act 714, the UE 615 digitizes or samples the remaining symbols of the DL communication in the time slot based on the AGC performed at act 710. For example, the LNA of the UE 615 may amplify the RF signal associated with the remaining symbols of the time slot using the updated LNA gain state from the AGC performed based on the AGC reference signal of the first symbol, and pass the amplified signal to the analog front end circuit (e.g., Figure 4 The ADC may then digitally sample the signal and pass it to a digital front-end circuit (e.g., Figure 4 408) for further digital processing.

[0093] Figure 86 is a signaling diagram illustrating a wireless communication method 800 for activating and transmitting AGC reference signal resources according to aspects of the present disclosure. Method 800 is performed by UE 615 and BS 605. UE 615 605 may be one of UEs 115 in network 100, and BS 605 may be one of BSs 105 in network 100. Furthermore, UE 615 may include UE 615 1000, described below. Similarly, BS 605 may include BS 605 900, described below. As illustrated, method 800 includes several of the enumerated steps, but aspects of method 800 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order. In method 800, BS 605 may request AGC reference signals for UL communications based on the occurrence of one or more triggering conditions.

[0094] At action 802, the BS 605 transmits and the UE 615 receives an automatic gain control (AGC) reference signal configuration. Action 802 may include the BS 605 transmitting a control signal indicating the AGC reference signal configuration. In some aspects, the control signal may include an RRC message or an RRC configuration. In other aspects, the control signal may include a MAC information element and / or a MAC control element (MAC-CE). The AGC reference signal configuration may indicate the time resources and frequency resources used for the AGC reference signal, including the first codeword of a time slot associated with a scheduled DL communication or UL communication. For example, the AGC reference signal configuration may indicate the number of codewords allocated for the AGC reference signal. The number of codewords allocated for the AGC reference signal may be one, two, three, and / or any other suitable number of codewords. In some aspects, the AGC reference signal configuration may indicate other parameters or characteristics of the AGC reference signal, such as a signal type. For example, the AGC reference signal configuration may indicate that the AGC reference signal is a copy or replication of the immediately following codeword. For another example, the AGC reference signal configuration may indicate a pilot signal so that the UE 615 can use the AGC reference signal to perform RSRP and / or SNR calculations. In some aspects, the AGC reference signal configuration may indicate the periodicity of the AGC reference signal. For example, the AGC reference signal configuration may indicate that an AGC reference signal resource will be allocated once every n time slots. For another example, the AGC reference signal configuration may indicate that an AGC reference signal resource will be allocated semi-persistently. For example, the AGC reference signal configuration may indicate that a first AGC reference signal resource will be allocated in a first time slot with x repetitions and every y time slots. In other aspects, the AGC reference signal configuration and / or signal characteristics may be pre-configured at the UE. As further described below, the UE 615 may use the AGC reference signal configuration to transmit an AGC reference signal to the BS 605 in response to activation of the AGC reference signal for UL communication.

[0095] At action 804, BS 605 monitors and detects one or more trigger conditions for activating AGC reference signal resources for UL communications. The trigger conditions may be associated with communication conditions for which it is beneficial for BS 605 to sample, digitize, and / or otherwise process DL communications from UE 615. For example, the trigger conditions for BS 605 to activate AGC reference signal resources may include a modulation and coding scheme (MCS) configured for DL communications and / or UL communications between BS 605 and UE 615. For example, if BS 605 determines to use an MCS of n, BS 605 may determine to activate AGC reference signal resources for UL communications from UE 615. For example, for higher MCSs (e.g., 128QAM, 256QAM, etc.), BS 605 may activate AGC reference signal resources for DL communications and / or UL communications. In some aspects, the activation of the AGC reference signal may be implicitly indicated to UE 615 based on the MCS of the scheduled UL communications. For example, the UE 615 may be configured with a table that associates MCS values with AGC reference signal states (e.g., whether the AGC reference signal is activated / deactivated). In some aspects, the MCS value may be associated with a number of AGC reference signal symbols activated for DL communication and / or UL communication. For example, the UE 615 may determine a number of symbols (e.g., one, two, three, etc.) allocated for the AGC reference signal in a time slot based on the MCS value.

[0096] For example, the triggering conditions may include priority level, signal-to-noise ratio (SNR), spectral efficiency, mobility, reported CQI, data channel type, beam switching detected from a neighboring UE, SRS reception for CLI reporting and / or geographic area, as similarly described above with respect to action 604 in method 600.

[0097] At action 806, based on one or more triggering conditions detected at action 804, UE 615 receives a signal from BS 605 to activate AGC reference signal resources for UL communication. The AGC reference signal resources include at least the first code element of the time slot associated with the scheduled UL communication. In some embodiments, receiving the signal indicating the AGC reference signal resources includes receiving downlink control information indicating the AGC reference signal resources. For example, the DCI can indicate the activation of the AGC reference signal resources. In some aspects, the DCI can also indicate the time resources and frequency resources associated with the scheduled UL communication. For example, the DCI can carry both the UL grant and the activation of the AGC reference signal resources. In some aspects, the DCI can indicate the time resources and frequency resources associated with the PUSCH.

[0098] In some aspects, AGC reference signal activation is associated with the AGC reference signal configuration transmitted at action 802. The signal transmitted at action 806 and / or the AGC reference signal configuration transmitted at action 802 can be transmitted using dedicated or non-dedicated signaling. For example, AGC reference signal resource activation can be a dedicated DCI transmitted in a PDCCH, or a group-common message (e.g., a DCI transmitted in a group-common PDCCH). As another example, AGC reference signal activation can be a broadcast message transmitted in a PBCH. In some aspects, the AGC reference signal configuration can include or indicate a mapping between different modulation and coding scheme (MCS) values and a number of allocated AGC reference signal symbols. Based on this mapping, the UE 615 can determine whether to transmit the AGC reference signal using the scheduled UL communication and / or whether a number of symbols are allocated for the AGC reference signal in the scheduled UL communication. In this regard, as described above, the activation of the AGC reference signal for the scheduled UL communication can be based on the characteristics of the communication between the BS 605 and the UE 615.

[0099] At action 808, the UE 615 transmits in the time slot and the BS 605 receives the scheduled UL communication, wherein the scheduled UL communication includes the AGC reference signal in the indicated AGC reference signal resource. As described above, the AGC reference signal resource includes at least the first codeword of the time slot associated with the scheduled UL communication. However, in some aspects, the AGC reference signal can be transmitted in more than one codeword. For example, the scheduled UL communication can be transmitted by the UE 615 in the time slot, wherein the first, second, or third codewords of the time slot include the AGC reference signal. In some aspects, receiving the AGC reference signal in the AGC reference signal resource includes receiving a copy or repetition of one or more codewords after the AGC reference signal. For another example, receiving the AGC reference signal includes receiving a reference signal associated with a known pilot, such as a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a tracking reference signal (TRS), and / or a demodulation reference signal (DMRS).

[0100] In some aspects, the UE 615 may transmit a single AGC reference signal in each resource block. In other aspects, more than one AGC reference signal may be transmitted in each resource block. In other aspects, a single AGC reference signal may be transmitted for each carrier frequency. In other aspects, more than one AGC reference signal may be transmitted for each carrier frequency. For example, the UE 615 may transmit an AGC reference signal in each subcarrier of each resource block. In some aspects, the BS 605 may use the AGC reference signal to calculate a received signal strength indicator (RSSI), a reference signal received power (RSRP), and / or a signal-to-noise ratio (SNR).

[0101] In some aspects, actions 802 through 808 may be based on a duplex mode of communication between the BS 605 and the UE 615. For example, in some aspects, based on the scheduled UL communication being full-duplex (FD) communication, the UE 615 is configured to transmit an AGC reference signal, and the BS 605 is configured to receive the AGC reference signal. In another aspect, based on the scheduled UL communication being half-duplex (HD) communication, the UE 615 is configured to transmit an AGC reference signal, and the BS 605 is configured to receive the AGC reference signal.

[0102] At act 810, BS 605 performs AGC on the scheduled UL communication based on the AGC reference signal. In some aspects, performing AGC includes determining an RSSI value based on the AGC reference signal. Because the AGC reference signal is located in the first symbol of the time slot, BS 605 can perform AGC to update the gain state of the LNA in the analog front end for at least some of the remaining symbols in the time slot that includes the UL communication. For example, if the AGC reference signal occupies only the first symbol of the time slot, BS 605 can perform AGC to update the LNA gain state to digitize / sample the second symbol and all other remaining symbols of the time slot. For another example, if BS 605 is not configured with an LNA switching time that enables single-symbol gain state updates, the AGC reference signal can occupy the first two, three, four, or any other suitable number of symbols of the time slot, where the symbols allocated to the AGC reference signal are consecutive and include the first symbol. More frequent updates of the LNA gain state can reduce the probability of LNA saturation and increase the probability that the LNA gain state has been correctly set or selected. Therefore, BS 605 can more efficiently digitize or sample the signal for the remaining symbols in the time slot.

[0103] At act 812, BS 605 digitizes or samples the remaining symbols of the UL communication in the time slot based on the AGC performed at act 810. For example, the LNA of BS 605 may amplify the RF signal associated with the remaining symbols of the time slot using the updated LNA gain state from the AGC performed based on the AGC reference signal of the first symbol and pass the amplified signal to the analog front end circuit (e.g., Figure 4 The ADC may then digitally sample the signal and pass it to a digital front-end circuit (e.g., Figure 4 408) for further digital processing.

[0104] Figure 9 is a block diagram of an exemplary base station (BS) 900 according to some aspects of the present disclosure. BS 900 may be the above Figure 1As shown, BS 900 may include a processor 902, a memory 904, an AGC reference signal module 908, a transceiver 910 including a modem subsystem 912 and a radio frequency (RF) unit 914, and one or more antennas 916. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0105] The processor 902 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 902 may also be implemented as a combination of computing devices, for example, 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.

[0106] The memory 904 may include cache memory (e.g., cache memory of the processor 902), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, a solid-state memory device, a hard drive, other forms of volatile and non-volatile memory, or a combination of different types of memory. In one aspect, the memory 904 includes a non-transitory computer-readable medium. The memory 904 may store or have recorded thereon instructions 906. The instructions 906 may include instructions that, when executed by the processor 902, cause the processor 902 to perform the various aspects described herein in conjunction with the present disclosure (e.g., Figures 4 to 8 、 Figure 11 and Figure 12 The instructions 906 may also be referred to as program code, which may be broadly interpreted as including any type of computer-readable statements.

[0107] The AGC reference signal module 908 can be implemented via hardware, software, or a combination thereof. For example, the AGC reference signal module 908 can be implemented as a processor, circuitry, and / or instructions 906 stored in the memory 904 and executed by the processor 902. In some examples, the AGC reference signal module 908 can be integrated within the modem subsystem 912. For example, the AGC reference signal module 908 can be implemented by a combination of software components (e.g., executed by a DSP or general-purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 912.

[0108] The AGC reference signal module 908 may be used in various aspects of the present disclosure, for example, Figures 4 to 8 、 Figure 11 and Figure 12 Aspects of the present invention. The AGC reference signal module 908 can be configured to transmit a signal indicating an AGC reference signal resource to a user equipment (UE), wherein the AGC reference signal resource includes at least the first symbol of a time slot associated with scheduled uplink (UL) communication. The AGC reference signal module 908 can be further configured to receive a scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource. The AGC reference signal module 908 can be further configured to perform AGC on the scheduled UL communication based on the AGC reference signal.

[0109] In some aspects, the AGC reference signal module 908 may be configured to transmit a system information block (SIB) to the UE, the system information block (SIB) including an RS configuration for a periodic RS opportunity for receiving the periodic RS. In some aspects, the AGC reference signal module 908 may be configured to receive a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the received activation command from the UE, the periodic RS opportunity for receiving the periodic RS falling within a time window that begins at least a threshold duration after transmitting the HARQ-ACK.

[0110] In some aspects, the AGC reference signal module 908 may be configured to transmit an SSB for activating the SCell to the UE within the time window but before the periodic RS opportunity. In some aspects, the periodic RS opportunity includes multiple RS opportunities, and the AGC reference signal module 908 may be configured to transmit an indication to the UE indicating an RS opportunity of the multiple RS opportunities via which the periodic RS is received at the UE.

[0111] In some aspects, the AGC reference signal module 908 may be configured to transmit an indication to the UE that the UE performs a tracking loop using a periodic RS to activate the SCell. In some aspects, the transceiver is further configured to transmit an indication indicating whether the BS transmits an aperiodic RS to the UE to activate the SCell.

[0112] As shown, transceiver 910 may include a modem subsystem 912 and an RF unit 914. Transceiver 910 may be configured to communicate bidirectionally with other devices, such as BS 105. Modem subsystem 912 may be configured to modulate and / or encode data from memory 904 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.). RF unit 914 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., PUSCH signals, UL data, SRS, UE capability reports, RI reports) from modem subsystem 912 (for outbound transmissions) or from another source, such as UE 115 or BS 105. RF unit 914 may further be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in transceiver 910, modem subsystem 912 and RF unit 914 may be separate devices that are coupled together at BS 900 to enable BS 900 to communicate with other devices.

[0113] The RF unit 914 can provide modulated and / or processed data, such as data packets (or more generally, data messages that can include one or more data packets and other information), to the antenna 916 for transmission to one or more other devices. The antenna 916 can also receive data messages transmitted from other devices. The antenna 916 can provide the received data messages for processing and / or demodulation at the transceiver 910. The transceiver 910 can provide demodulated and decoded data (e.g., PDSCH signals, PDCCH, DL data, activation commands, availability indicator signaling, etc.) to the AGC reference signal module 908. The antenna 916 can include multiple antennas of similar or different designs to maintain multiple transmit chains. The RF unit 914 can configure the antenna 916.

[0114] In one aspect, the BS 900 may include multiple transceivers 910 that implement different RATs (e.g., NR and LTE). In one aspect, the BS 900 may include a single transceiver 910 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 910 may include various components, where different combinations of components may implement different RATs.

[0115] Figure 10 is a block diagram of an exemplary UE 1000 according to some aspects of the present disclosure. The UE 1000 may be Figure 11000. As shown, UE 1000 may include a processor 1002, a memory 1004, an AGC reference signal module 1008, a transceiver 1010 including a modem subsystem 1012 and an RF unit 1014, and one or more antennas 1016. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0116] The processor 1002 may have various characteristics that are specific to the type of processor. For example, these characteristics may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 1002 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0117] The memory 1004 may include cache memory (e.g., cache memory of the processor 1002), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid-state memory device, one or more hard disk drives, a memristor-based array, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 1004 may include a non-transitory computer-readable medium. The memory 1004 may store instructions 1006. The instructions 1006 may include instructions that, when executed by the processor 1002, cause the processor 1002 to perform the operations described herein, such as Figures 4 to 8 、 Figure 11 and Figure 12 Instructions 1006 may also be referred to as program code. The program code may be code for causing the wireless communication device to perform the operations (e.g., by causing one or more processors (such as processor 1002) to control or command the wireless communication device to do so). The terms "instructions" and "code" should be broadly interpreted to include any type of computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, procedures, etc. "Instructions" and "code" may include a single computer-readable statement or many computer-readable statements.

[0118] The AGC reference signal module 1008 may be implemented via hardware, software, or a combination thereof. For example, the AGC reference signal module 1008 may be implemented as a processor, circuitry, and / or instructions 1006 stored in the memory 1004 and executed by the processor 1002. In some examples, the AGC reference signal module 1008 may be integrated within the modem subsystem 1012. For example, the AGC reference signal module 1008 may be implemented by a combination of software components (e.g., executed by a DSP or general-purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 1012. The AGC reference signal module 1008 may be used in various aspects of the present disclosure, for example, Figures 4 to 8 、 Figure 11 and Figure 12 For example, the AGC reference signal module 1008 may be configured to receive a signal indicating an AGC reference signal resource from a base station (BS), wherein the AGC reference signal resource includes at least the first symbol of a time slot associated with scheduled downlink (DL) communication. The AGC reference signal module 1008 may be further configured to receive a scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource. The AGC reference signal module 1008 may be further configured to perform AGC on the scheduled DL communication based on the AGC reference signal.

[0119] As shown, transceiver 1010 may include a modem subsystem 1012 and an RF unit 1014. Transceiver 1010 may be configured to communicate bidirectionally with other devices, such as UE 115 and / or another core network element. Modem subsystem 1012 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC decoding scheme, a Turbo decoding scheme, a convolutional decoding scheme, a digital beamforming scheme, etc.). RF unit 1014 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., PSBCH, sidelink RMSI, PSSCH, PSCCH, PSFCH, PC5-RRC configuration, control commands) from modem subsystem 1012 (for outbound transmissions) or from another source, such as UE 115. RF unit 1014 may be further configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in the transceiver 1010, the modem subsystem 1012 and / or the RF unit 1014 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

[0120] The RF unit 1014 can provide modulated and / or processed data, such as data packets (or more generally, data messages that can include one or more data packets and other information), to the antenna 1016 for transmission to one or more other devices. This can include, for example, information transmission for completing attachment to the network and communication with the camped UE 115 according to some aspects of the present disclosure. The antenna 1016 can also receive data messages transmitted from other devices and provide the received data messages for processing and / or demodulation at the transceiver 1010. The transceiver 1010 can provide demodulated and decoded data (e.g., PSCCH, PSSCH, PSFCH, measurement data, sensor data records, activation commands, availability indicator signaling, etc.) to the AGC reference signal module 1008 for processing. The antenna 1016 can include multiple antennas of similar or different designs to maintain multiple transmit chains.

[0121] In some aspects, the transceiver 1010 is configured to communicate with a base station (BS) to receive a signal indicating activation of an AGC reference signal resource from the base station (BS) and to receive an AGC reference signal in the AGC reference signal resource from the BS.

[0122] In one aspect, the UE 1000 may include multiple transceivers 1010 that implement different RATs (e.g., NR and LTE). In one aspect, the UE 1000 may include a single transceiver 1010 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 1010 may include various components, where different combinations of components may implement different RATs.

[0123] Figure 11 10 is a flow chart of a wireless communication method 1100 according to some aspects of the present disclosure. Aspects of method 1100 may be performed by a computing device (e.g., a processor, processing circuitry, and / or another suitable component) of a wireless communication device or another suitable means for performing steps. For example, a wireless communication device (such as UE 115) may utilize one or more components (such as processor 1002, memory 1004, AGC reference signal module 1008, transceiver 1010, modem 1012, and one or more antennas 1016) to perform the steps of method 1100. As illustrated, method 1100 includes several of the enumerated steps, but aspects of method 1100 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0124] At block 1110, a user equipment (UE) receives a signal indicating an automatic gain control (AGC) reference signal resource from a base station (BS). The AGC reference signal resource includes at least the first symbol of a time slot associated with a scheduled downlink (DL) communication. In some embodiments, receiving a signal indicating an AGC reference signal resource includes receiving downlink control information (DCI) indicating the AGC reference signal resource. For example, the DCI may indicate activation of the AGC reference signal resource. In some aspects, the DCI may also indicate time resources and frequency resources associated with the scheduled DL communication. For example, the DCI may carry both a DL grant and activation of the AGC reference signal resource. In some aspects, the DCI may indicate time resources and frequency resources associated with a PDSCH.

[0125] In some aspects, AGC reference signal activation is associated with AGC reference signal configuration. For example, method 1100 may include receiving a first control signal from the BS indicating the AGC reference signal configuration. Block 1110 may also include receiving a second control signal indicating activation of the AGC reference signal configuration. In some aspects, the first control signal may include an RRC message or an RRC configuration. In other aspects, the first control signal may include a MAC information element and / or a MAC control element (MAC-CE). The AGC reference signal configuration may indicate time resources and frequency resources used for the AGC reference signal, including the first codeword of a time slot associated with the scheduled DL communication. For example, the AGC reference signal configuration may indicate a number of codewords allocated for the AGC reference signal. The number of codewords allocated for the AGC reference signal may be one, two, three, and / or any other suitable number of codewords. In some aspects, the AGC reference signal configuration may indicate other parameters or characteristics of the AGC reference signal, such as a signal type. For example, the AGC reference signal configuration may indicate that the AGC reference signal is a copy or replication of the immediately following codeword. For another example, the AGC reference signal configuration may indicate a pilot signal so that the UE can use the AGC reference signal for RSRP and / or SNR calculations. In some aspects, the AGC reference signal configuration may indicate the periodicity of the AGC reference signal. For example, the AGC reference signal configuration may indicate that the AGC reference signal resource will be allocated once every n time slots. For another example, the AGC reference signal configuration may indicate that the AGC reference signal resource will be allocated semi-persistently. For example, the AGC reference signal configuration may indicate that the first AGC reference signal resource will be allocated in the first time slot with x repetitions and every y time slots. In other aspects, the AGC reference signal configuration and / or signal characteristics may be pre-configured at the UE.

[0126] The signal and / or AGC reference signal configuration transmitted at block 1110 may be transmitted using dedicated or non-dedicated signaling. For example, the signal indicating the AGC reference signal resources may be a dedicated DCI transmitted in a PDCCH, or a group-common message (e.g., a DCI transmitted in a group-common PDCCH). As another example, the signal indicating the AGC reference signal resources and / or the AGC reference signal configuration may be a broadcast message transmitted in a PBCH. In some aspects, the AGC reference signal configuration may include or indicate a mapping between different modulation and coding scheme (MCS) values and a number of allocated AGC reference signal symbols. Based on this mapping, the UE may determine whether an allocated AGC reference signal exists and / or whether a number of symbols are allocated for the AGC reference signal in the scheduled DL communication. In this regard, as described above, activation of the AGC reference signal for the scheduled DL communication may be based on characteristics of the communication between the BS and the UE. In this regard, a higher throughput MCS may benefit from faster updates to the LNA gain state to accommodate rapid changes in interference.

[0127] In some aspects, the actions of block 1110 described above may be based on the duplex mode of communication between the BS and the UE. For example, in some aspects, based on the scheduled DL communication being full-duplex (FD) communication, the BS is configured to transmit an AGC reference signal, and the UE is configured to receive the AGC reference signal. In another aspect, based on the scheduled DL communication being half-duplex (HD) communication, the BS is configured to transmit an AGC reference signal, and the UE is configured to receive the AGC reference signal.

[0128] At box 1120, the UE receives the scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes the AGC reference signal in the indicated AGC reference signal resource. As described above, the AGC reference signal resource includes at least the first codeword of the time slot associated with the scheduled DL communication. However, the AGC reference signal may be transmitted in more than one codeword. For example, the scheduled DL communication may be transmitted by the BS in the time slot, wherein the first, second, or third codewords of the time slot include the AGC reference signal. In some aspects, receiving the AGC reference signal in the AGC reference signal resource includes receiving a copy or repetition of one or more codewords after the AGC reference signal. For another example, receiving the AGC reference signal includes receiving a reference signal associated with a known pilot, such as a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a tracking reference signal (TRS), and / or a demodulation reference signal (DMRS).

[0129] In some aspects, the UE may receive a single AGC reference signal in each resource block. In other aspects, more than one AGC reference signal may be received in each resource block. In other aspects, a single AGC reference signal may be received for each carrier frequency. In other aspects, more than one AGC reference signal may be received for each carrier frequency. For example, the UE may receive an AGC reference signal in each subcarrier of each resource block. In some aspects, the UE may use the AGC reference signal to calculate a received signal strength indicator (RSSI), a reference signal received power (RSRP), and / or a signal-to-noise ratio (SNR).

[0130] At block 1130, the UE performs AGC on the scheduled DL communication based on the AGC reference signal. In some aspects, performing AGC includes determining an RSSI value based on the AGC reference signal. Because the AGC reference signal is located in the first symbol of the time slot, the UE can perform AGC to update the gain state of the LNA in the analog front end for at least some of the remaining symbols in the time slot that includes the DL communication. For example, if the AGC reference signal occupies only the first symbol of the time slot, the UE can perform AGC to update the LNA gain state to digitize / sample the second symbol and all other remaining symbols of the time slot. For another example, if the UE is not configured with an LNA switching time that enables single-symbol gain state updates, the AGC reference signal can occupy the first two, three, four, or any other suitable number of symbols of the time slot, where the symbols allocated to the AGC reference signal are consecutive and include the first symbol. Updating the LNA gain state more frequently can reduce the probability of LNA saturation and increase the probability that the LNA gain state has been correctly set or selected. Therefore, the UE can more efficiently digitize or sample the signal for the remaining symbols in the time slot.

[0131] In some aspects, the indication of AGC reference signal resources and the reception of AGC reference signals in scheduled DL communications may be based on a request from the UE. For example, the UE may request AGC reference signal resources based on the MCS used by the UE and / or the BS for DL communications and / or UL communications. For example, the UE may be configured with a table that indicates, for each MCS value, whether the UE should request AGC reference signal resources and / or a number of symbols for AGC reference signal resources. For another example, the UE may transmit a request to the BS based on the UE's mobility level. For example, the UE may transmit a request for AGC reference signal resources to the BS based on a mobility indicator (MI) associated with the UE. In some aspects, the UE may perform autonomous measurements to estimate characteristics of dynamic clutter reflections and transmit a request for AGC reference signal resources based on the autonomous measurements.

[0132] On the other hand, the UE may receive a signal indicating the AGC reference signal resources based on the UE's MI. For example, the UE may transmit a sum indicating the UE's MI to the BS. Based on the MI, the BS may transmit a signal indicating the AGC reference signal resources. Transmitting the MI may include transmitting an RSRP report and / or an RSSI report. In some aspects, the signal indicating the AGC reference signal resources may be an implicit indication rather than an explicit indication. For example, receiving the signal indicating the AGC reference signal resources may include receiving control information indicating whether the DL communication is full-duplex communication, half-duplex communication, or any other type of duplex communication. In other aspects, the implicit indication may include receiving control information indicating the MCS index used for the DL communication.

[0133] Figure 12 1 is a flow chart of a wireless communication method 1200 according to some aspects of the present disclosure. Aspects of method 1200 may be performed by a computing device (e.g., a processor, processing circuitry, and / or another suitable component) of a wireless communication device, or another suitable means for performing steps. For example, a wireless communication device (such as BS 105) may utilize one or more components (such as processor 902, memory 904, AGC reference signal module 908, transceiver 910, modem 912, and one or more antennas 916) to perform the steps of method 1200. In some aspects, method 1200 described below may include the BS transmitting a request or indication to a UE for the UE to transmit an AGC reference signal. The BS may then use the received AGC reference signal to update the gain state of the LNA, similar to what the UE performed in method 1100 described above. As illustrated, method 1200 includes several of the enumerated steps, but aspects of method 1200 may include additional steps before, after, or between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0134] At block 1210, a base station (BS) transmits a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE). The AGC reference signal resource includes at least the first symbol of a time slot associated with a scheduled uplink (UL) communication. In some embodiments, transmitting a signal indicating the AGC reference signal resource includes transmitting downlink control information indicating the AGC reference signal resource. For example, the DCI may indicate activation of the AGC reference signal resource. In some aspects, the DCI may also indicate time resources and frequency resources associated with the scheduled UL communication. For example, the DCI may carry both a UL grant and activation of the AGC reference signal resource. In some aspects, the DCI may indicate time resources and frequency resources associated with the PDSCH. In other aspects, transmitting a signal indicating the AGC reference signal resource includes transmitting an RRC message, a MAC information element, and / or a MAC-CE.

[0135] In some aspects, AGC reference signal activation is associated with AGC reference signal configuration. For example, method 1200 may include the BS transmitting a first control signal indicating the AGC reference signal configuration to the UE. Block 1210 may include transmitting a second control signal indicating activation of the AGC reference signal configuration. In some aspects, the first control signal may include an RRC message or an RRC configuration. In other aspects, the first control signal may include a MAC information element and / or a MAC control element (MAC-CE). The AGC reference signal configuration may indicate time resources and frequency resources used for the AGC reference signal, including the first codeword of a time slot associated with the scheduled UL communication. For example, the AGC reference signal configuration may indicate a number of codewords allocated for the AGC reference signal. The number of codewords allocated for the AGC reference signal may be one, two, three, and / or any other suitable number of codewords. In some aspects, the AGC reference signal configuration may indicate other parameters or characteristics of the AGC reference signal, such as a signal type. For example, the AGC reference signal configuration may indicate that the AGC reference signal is a copy or replication of the immediately following codeword. For another example, the AGC reference signal configuration may indicate a pilot signal so that the BS can use the AGC reference signal to perform RSRP and / or SNR calculations. In some aspects, the AGC reference signal configuration may indicate the periodicity of the AGC reference signal. For example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated once every n time slots. For another example, the AGC reference signal configuration may indicate that an AGC reference signal resource is allocated semi-persistently. For example, the AGC reference signal configuration may indicate that a first AGC reference signal resource is allocated in a first time slot with x repetitions and every y time slots. In other aspects, the AGC reference signal configuration and / or signal characteristics may be pre-configured at the UE.

[0136] The signal and / or AGC reference signal configuration transmitted at block 1110 may be transmitted using dedicated or non-dedicated signaling. For example, the signal indicating the AGC reference signal resources may be a dedicated DCI transmitted in a PDCCH, or a group-common message (e.g., a DCI transmitted in a group-common PDCCH). As another example, the signal indicating the AGC reference signal resources and / or the AGC reference signal configuration may be a broadcast message transmitted in a PBCH. In some aspects, the AGC reference signal configuration may include or indicate a mapping between different modulation and coding scheme (MCS) values and a number of allocated AGC reference signal symbols. Based on this mapping, the UE may determine whether an allocated AGC reference signal exists and / or whether a number of symbols are allocated for the AGC reference signal in the scheduled DL communication. In this regard, as described above, activation of the AGC reference signal for the scheduled DL communication may be based on characteristics of the communication between the BS and the UE. In this regard, a higher throughput MCS may benefit from faster updates to the LNA gain state to accommodate rapid changes in interference.

[0137] In some aspects, the actions of block 1210 described above may be based on the duplex mode of communication between the BS and the UE. For example, in some aspects, based on the scheduled UL communication being full-duplex (FD) communication, the BS is configured to transmit an AGC reference signal resource indication, and the UE is configured to receive the AGC reference signal resource indication. In another aspect, based on the scheduled UL communication being half-duplex (HD) communication, the BS is configured to transmit an AGC reference signal resource indication, and the UE is configured to receive the AGC reference signal resource indication.

[0138] At block 1220, the BS receives the scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the indicated AGC reference signal resource. As described above, the AGC reference signal resource includes at least the first codeword of the time slot associated with the scheduled UL communication. However, in some aspects, the AGC reference signal may be received in more than one codeword. For example, the scheduled UL communication may be transmitted by the UE in the time slot, wherein the first, second, or third codewords of the time slot include the AGC reference signal. In some aspects, receiving the AGC reference signal in the AGC reference signal resource includes receiving a copy or repetition of one or more codewords after the AGC reference signal. For another example, receiving the AGC reference signal includes receiving a reference signal associated with a known pilot, such as a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), a tracking reference signal (TRS), and / or a demodulation reference signal (DMRS).

[0139] In some aspects, the BS may receive a single AGC reference signal in each resource block. In other aspects, more than one AGC reference signal may be received in each resource block. In other aspects, a single AGC reference signal may be received for each carrier frequency. In other aspects, more than one AGC reference signal may be received for each carrier frequency. For example, the BS may receive an AGC reference signal in each subcarrier of each resource block. In some aspects, the BS may use the AGC reference signal to calculate a received signal strength indicator (RSSI), a reference signal received power (RSRP), and / or a signal-to-noise ratio (SNR).

[0140] At block 1230, the BS performs AGC on the scheduled UL communication based on the AGC reference signal. In some aspects, performing AGC includes determining an RSSI value based on the AGC reference signal. Because the AGC reference signal is located in the first symbol of the time slot, the BS can perform AGC to update the gain state of the LNA in the analog front end for at least some of the remaining symbols in the time slot that includes the UL communication. For example, if the AGC reference signal occupies only the first symbol of the time slot, the BS can perform AGC to update the LNA gain state to digitize / sample the second symbol and all other remaining symbols of the time slot. For another example, if the BS is not configured with an LNA switching time that enables single-symbol gain state updates, the AGC reference signal can occupy the first two, three, four, or any other suitable number of symbols of the time slot, where the symbols allocated to the AGC reference signal are consecutive and include the first symbol. More frequent updates of the LNA gain state can reduce the probability of LNA saturation and increase the probability that the LNA gain state has been correctly set or selected. Therefore, the BS can more efficiently digitize or digitally sample the signal for the remaining symbols in the time slot.

[0141] In some aspects, transmitting the AGC reference signal resource indication includes transmitting a request for the UE to transmit an AGC reference signal in the indicated AGC reference signal resource. For example, the BS may request the AGC reference signal resource based on an MCS used by the UE and / or the BS for downlink and / or uplink communications. For example, the BS may be configured with a table that indicates, for each MCS value, whether the BS should request the AGC reference signal resource and / or a number of symbols to use for the AGC reference signal resource.

[0142] In another aspect, the BS may request AGC reference signal resources based on the MI of the UE. For example, the UE may transmit an indication of the MI of the UE to the BS. Based on the MI, the BS may transmit a signal indicating the AGC reference signal resources.

[0143] Citation of Some Aspects of the Disclosure

[0144] Aspect 1. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving a signal indicating an automatic gain control (AGC) reference signal resource from a base station (BS), wherein the AGC reference signal resource includes at least a first code element of a time slot associated with scheduled downlink (DL) communication; receiving the scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; and performing AGC on the scheduled DL communication based on the AGC reference signal.

[0145] Aspect 2. The method according to aspect 1, wherein the receiving the signal indicating the AGC comprises receiving downlink control information (DCI) indicating the AGC reference signal resource.

[0146] Aspect 3. The method according to aspect 2, wherein the DCI further indicates time resources and frequency resources associated with the scheduled DL communication.

[0147] Aspect 4. According to the method described in any one of Aspects 1 to 3, the method further includes: receiving a first control signal indicating an AGC reference signal configuration from the BS, wherein the receiving of the signal indicating the AGC reference signal resource includes receiving a second control signal activating the AGC reference signal configuration.

[0148] Aspect 5. A method according to any one of aspects 1 to 4, wherein the scheduled DL communication includes full-duplex (FD) DL communication, and wherein the receiving the signal indicating the AGC reference signal resource includes receiving downlink control information (DCI) indicating the FD DL communication.

[0149] Aspect 6. A method according to any one of Aspects 1 to 4, wherein the scheduled DL communication includes half-duplex (HD) DL communication, and wherein receiving the signal indicating the AGC reference signal resource includes receiving downlink control information (DCI) indicating the HDDL communication.

[0150] Aspect 7. A method according to any one of aspects 1 to 6, wherein the time slot includes the first codeword and a plurality of remaining codewords, and wherein the performing the AGC includes performing the AGC on the plurality of remaining codewords of the time slot.

[0151] Aspect 8. The method according to any one of aspects 1 to 7, wherein the AGC reference signal resource includes the first codeword and at least a second codeword of the time slot, wherein the second codeword is adjacent to the first codeword.

[0152] Aspect 9. The method according to any one of aspects 1 to 8, further comprising: updating a low noise amplifier (LNA) gain state based on the AGC.

[0153] Aspect 10. The method according to aspect 9, further comprising: digitally sampling the data signal in the time slot based on the updated LNA gain state.

[0154] Aspect 11. The method according to any one of aspects 1 to 10, further comprising: transmitting a request for the AGC reference signal resource to the BS.

[0155] Aspect 12. The method of aspect 11, wherein the request is based on a modulation and coding scheme (MCS) used for the scheduled DL communication.

[0156] Aspect 13. The method of aspect 11, wherein the request is based on a mobility indicator (MI) based cross-link interference (CLI) report associated with the UE.

[0157] Aspect 14. The method according to aspect 1, further comprising: transmitting a mobility indicator (MI) to the BS, wherein the AGC reference signal is based on the MI.

[0158] Aspect 15. A method for wireless communication performed by a base station (BS), the method comprising: transmitting a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE), wherein the AGC reference signal resource includes at least a first codeword of a time slot associated with a scheduled uplink (UL) communication; receiving the scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource; and performing AGC on the scheduled UL communication based on the AGC reference signal.

[0159] Aspect 16. The method of aspect 15, wherein the transmitting the signal indicating the AGC comprises transmitting downlink control information (DCI) indicating the AGC reference signal resource.

[0160] Aspect 17. The method of aspect 16, wherein the DCI further indicates time resources and frequency resources associated with the scheduled UL communication.

[0161] Aspect 18. The method according to any one of Aspects 15 to 17 further includes: transmitting a first control signal indicating an AGC reference signal configuration to the UE, wherein the transmitting the signal indicating the AGC reference signal resource includes transmitting a second control signal activating the AGC reference signal configuration.

[0162] Aspect 19. A method according to any one of Aspects 15 to 18, wherein the scheduled UL communication includes full-duplex (FD) UL communication, and wherein transmitting the signal indicating the AGC reference signal resource includes transmitting downlink control information (DCI) indicating the FD UL communication.

[0163] Aspect 20. The method of any one of aspects 15 to 18, wherein the scheduled UL communication comprises half-duplex (HD) UL communication, and wherein transmitting the signal indicating the AGC reference signal resource comprises transmitting downlink control information (DCI) indicating the HD UL communication.

[0164] Aspect 21. A user equipment (UE), comprising: a transceiver; and a processor in communication with the transceiver such that the transceiver and the processor are configured to perform actions according to any one of aspects 1 to 14.

[0165] Aspect 22. A base station (BS), comprising: a transceiver; and a processor in communication with the transceiver such that the transceiver and the processor are configured to perform actions according to any one of aspects 15 to 20.

[0166] Aspect 23. A non-transitory computer-readable medium having program code recorded thereon, wherein the program code comprises instructions executable by a processor of a user equipment (UE) to perform actions according to any one of aspects 1 to 14.

[0167] Aspect 24. A non-transitory computer-readable medium having program code recorded thereon, wherein the program code comprises instructions executable by a processor of a base station (BS) to perform actions according to any one of aspects 15 to 20.

[0168] Aspect 25. A user equipment (UE), comprising means for performing the steps according to any one of aspects 1 to 14.

[0169] Aspect 26. A base station (BS), comprising means for performing the steps of any one of aspects 15 to 20.

[0170] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0171] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and the terminology of LTE, LTE-A, LTE-A Pro, or NR may be used throughout much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0172] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips referred to throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0173] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0174] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features that implement the functions may also be physically located at different locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0175] Computer-readable medium includes both non-transient computer storage media and communication media, and it includes any medium that facilitates a computer program to be transferred from one place to another.Non-transient storage medium can be any available medium that can be accessed by a general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used for carrying or storing required program code unit and can be accessed by a general or special-purpose computer or a general or special-purpose processor in the form of an instruction or data structure.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwave are used to transmit software from a website, server or other remote source, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0176] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0177] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0178] The description set forth herein in conjunction with the accompanying drawings describes example configurations and does not represent all examples that can be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." The detailed description includes specific details to provide an understanding of the technology. However, the technology can be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to suppress obscuring the concepts of the examples.

[0179] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not 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

1. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving a signal from a base station BS indicating an automatic gain control, AGC, reference signal resource, wherein the AGC reference signal resource comprises at least a first symbol of a time slot associated with a scheduled downlink, DL, communication, wherein the time slot comprises the first symbol and a plurality of remaining symbols; receiving a scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; performing AGC on the scheduled DL communications based on the AGC reference signal, wherein the performing the AGC comprises performing the AGC on at least some of the plurality of remaining symbols of the time slot; as well as Based on the performing the AGC, a low noise amplifier (LNA) gain state is updated for at least some of the plurality of remaining symbols of the time slot. 2 . The method of claim 1 , wherein the receiving the signal indicating the AGC comprises receiving downlink control information (DCI) indicating the AGC reference signal resource.

3. The method of claim 2, wherein the DCI further indicates time resources and frequency resources associated with the scheduled DL communication.

4. The method according to claim 1, further comprising: receiving a first control signal indicating an AGC reference signal configuration from the BS, Wherein receiving the signal indicating the AGC reference signal resource includes receiving a second control signal activating the AGC reference signal configuration. 5 . The method of claim 1 , wherein the scheduled DL communication comprises full-duplex FDDL communication, and wherein receiving the signal indicating the AGC reference signal resource comprises receiving downlink control information (DCI) indicative of the FD DL communication. 6 . The method of claim 1 , wherein the scheduled DL communication comprises half-duplex HDDL communication, and wherein receiving the signal indicating the AGC reference signal resource comprises receiving downlink control information (DCI) indicative of the HDDL communication.

7. The method of claim 1, wherein the AGC reference signal resource comprises the first symbol and at least a second symbol of the time slot, wherein the second symbol is adjacent to the first symbol.

8. The method according to claim 1, further comprising: The data signal in the time slot is digitally sampled based on the updated LNA gain state.

9. The method according to claim 1, further comprising: A request for the AGC reference signal resources is transmitted to the BS.

10. The method of claim 9, wherein the request is based on a modulation and coding scheme (MCS) used for the scheduled DL communication.

11. The method of claim 9, wherein the request is based on a cross-link interference (CLI) report based on a mobility indicator (MI) associated with the UE.

12. The method according to claim 1, further comprising: A mobility indicator (MI) is transmitted to the BS, wherein the AGC reference signal is based on the MI.

13. A method for wireless communication performed by a base station BS, the method comprising: transmitting a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE), wherein the AGC reference signal resource comprises at least a first symbol of a time slot associated with a scheduled uplink (UL) communication, wherein the time slot comprises the first symbol and a plurality of remaining symbols; receiving a scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource; performing AGC on the scheduled UL communications based on the AGC reference signal, wherein the performing the AGC comprises performing the AGC on at least some of the plurality of remaining symbols of the time slot; as well as Based on the performing the AGC, a low noise amplifier (LNA) gain state is updated for at least some of the plurality of remaining symbols of the time slot. 14 . The method of claim 13 , wherein the transmitting the signal indicating the AGC comprises transmitting downlink control information (DCI) indicating the AGC reference signal resource.

15. The method of claim 14, wherein the DCI further indicates time resources and frequency resources associated with the scheduled UL communication.

16. The method according to claim 13, further comprising: transmitting a first control signal indicating an AGC reference signal configuration to the UE, Wherein, transmitting the signal indicating the AGC reference signal resource comprises transmitting a second control signal activating the AGC reference signal configuration.

17. The method of claim 13, wherein the scheduled UL communication comprises full-duplex FD UL communication, and wherein transmitting the signal indicating the AGC reference signal resource comprises transmitting downlink control information (DCI) indicative of the FD UL communication.

18. The method of claim 13, wherein the scheduled UL communication comprises half-duplex (HDUL) communication, and wherein transmitting the signal indicative of the AGC reference signal resource comprises transmitting downlink control information (DCI) indicative of the HD UL communication.

19. A user equipment (UE), comprising: one or more transceivers; and one or more processors, the one or more processors in communication with the one or more transceivers, such that the UE is configured to: receiving a signal from a base station BS indicating an automatic gain control, AGC, reference signal resource, wherein the AGC reference signal resource comprises at least a first symbol of a time slot associated with a scheduled downlink, DL, communication, wherein the time slot comprises the first symbol and a plurality of remaining symbols; receiving a scheduled DL communication from the BS in the time slot, wherein the scheduled DL communication includes an AGC reference signal in the AGC reference signal resource; performing AGC on the scheduled DL communications based on the AGC reference signal, wherein the performing the AGC comprises performing the AGC on at least some of the plurality of remaining symbols of the time slot; and Based on the AGC, a low noise amplifier (LNA) gain state is updated for at least some of the plurality of remaining symbols of the time slot. 20 . The UE according to claim 19 , wherein the UE is further configured to receive downlink control information (DCI) indicating the AGC reference signal resource.

21. The UE according to claim 19, wherein the UE is further configured to: receiving a first control signal indicating an AGC reference signal configuration from the BS; and A second control signal is received to activate the AGC reference signal configuration.

22. The UE of claim 19, wherein the AGC reference signal resource comprises the first symbol and at least a second symbol of the time slot, wherein the second symbol is adjacent to the first symbol.

23. The UE according to claim 19, wherein the UE is further configured to: A request for the AGC reference signal resources is transmitted to the BS.

24. A base station BS, comprising: one or more transceivers; and one or more processors in communication with the one or more transceivers such that the BS is configured to: transmitting a signal indicating an automatic gain control (AGC) reference signal resource to a user equipment (UE), wherein the AGC reference signal resource comprises at least a first symbol of a time slot associated with a scheduled uplink (UL) communication, wherein the time slot comprises the first symbol and a plurality of remaining symbols; receiving a scheduled UL communication from the UE in the time slot, wherein the scheduled UL communication includes an AGC reference signal in the AGC reference signal resource; performing AGC on the scheduled UL communications based on the AGC reference signal, wherein the performing the AGC comprises performing the AGC on at least some of the plurality of remaining symbols of the time slot; and Based on the AGC, a low noise amplifier (LNA) gain state is updated for at least some of the plurality of remaining symbols of the time slot. 25 . The BS according to claim 24 , wherein the BS is further configured to transmit downlink control information (DCI) indicating the AGC reference signal resource.

26. The BS of claim 25, wherein the DCI further indicates time resources and frequency resources associated with the scheduled UL communication.

27. The BS according to claim 24, wherein the BS is further configured to: transmitting a first control signal indicating an AGC reference signal configuration to the UE; and A second control signal is transmitted to activate the AGC reference signal configuration.

28. An apparatus for wireless communication executed at a user equipment (UE), the apparatus comprising means for executing the method according to any one of claims 1 to 12.

29. An apparatus for wireless communication executed at a base station BS, the apparatus comprising means for executing the method according to any one of claims 13 to 18.

30. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a user equipment (UE) to cause the processors to perform the method according to any one of claims 1 to 12.

31. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a base station BS to cause the processors to perform the method according to any one of claims 13 to 18.

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