Timed event triggered full duplex suspension

Abstract

A method and apparatus for allowing a UE to request termination of FD operation based on the timing difference between uplink and downlink receive timing. The apparatus communicates with at least one TRP in full-duplex operation. The apparatus measures the timing difference between uplink and downlink receive timing in full-duplex operation. The apparatus sends a request to at least one TRP to terminate full-duplex operation based at least on the timing difference.

Description

[0001] Cross-references to related applications

[0002] This application claims the rights and priorities of the following applications: U.S. Provisional Application No. 63 / 079,679, filed September 17, 2020, entitled “TimeEvent Trigger Full Duplex Abortion”, and U.S. Patent Application No. 17 / 473,866, filed September 13, 2021, entitled “Timing Event Trigger Full Duplex Abortion”, the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] In summary, this disclosure relates to communication systems, and more specifically, to configurations for triggering full-duplex (FD) aborts via timed events. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources. Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different wireless devices to communicate at the municipal, national, regional, and even global levels. An example of a telecommunications standard is 5G New Radio (NR). 5G NR is part of the Continuous Mobile Broadband Evolution (CMB) initiative released by the 3rd Generation Partnership Project (3GPP) to meet new requirements related to latency, reliability, security, scalability (e.g., the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard. Further improvements to 5G NR technology are needed. These improvements can also be applied to other multiple access technologies and telecommunications standards that employ these technologies. Summary of the Invention

[0006] The following is a brief overview of one or more aspects to provide a basic understanding of them. This overview is not a general description of all anticipated aspects, nor is it intended to identify key or important elements of all aspects, nor to depict the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed descriptions that follow.

[0007] In one aspect of this disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may be a device at a UE (User Equipment). The device may be a processor and / or modem at the UE, or the UE itself. The apparatus communicates with at least one Transmitter-Receiver Point (TRP) in full-duplex operation. The apparatus measures a timing difference between the uplink and downlink receive timings of the full-duplex operation. The apparatus sends a request to terminate the full-duplex operation to the at least one TRP, based at least on the timing difference.

[0008] In one aspect of this disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may be a device at a base station. The device may be a processor and / or modem at the base station or the base station itself. The apparatus communicates with a user equipment (UE) in full-duplex operation. The apparatus receives a request from the UE to terminate the full-duplex operation based at least on the timing difference between the uplink and downlink receive timings of the full-duplex operation. The apparatus sends an instruction to the UE to terminate the full-duplex operation.

[0009] To achieve the foregoing and related objectives, the one or more aspects include the features fully described below and specifically pointed out in the claims. The following description and drawings illustrate certain illustrative features of one or more aspects in detail. However, these features indicate only a few of the various ways in which the principles of the aspects can be employed, and this description is intended to include all such aspects and their equivalents. Attached Figure Description

[0010] Figure 1 This is a diagram illustrating an example of a wireless communication system and access network.

[0011] Figure 2A This is a diagram illustrating an example of the first frame of various aspects according to this disclosure.

[0012] Figure 2B This is a diagram illustrating an example of a DL channel within a subframe according to various aspects of this disclosure.

[0013] Figure 2C This is a diagram illustrating an example of the second frame according to various aspects of this disclosure.

[0014] Figure 2D This is a diagram illustrating an example of a UL channel within a subframe according to various aspects of this disclosure.

[0015] Figure 3 This is a diagram illustrating an example of a base station and user equipment (UE) in an access network.

[0016] Figure 4 This is a diagram showing the uplink receive timing and downlink receive timing.

[0017] Figure 5 This is a diagram showing the uplink receive timing and downlink receive timing.

[0018] Figure 6 This is a call flow diagram of signaling between the UE and the base station.

[0019] Figure 7 This is a flowchart of a wireless communication method.

[0020] Figure 8 This is a flowchart of a wireless communication method.

[0021] Figure 9 This is a diagram illustrating an example hardware implementation scheme for the example device.

[0022] Figure 10 This is a flowchart of a wireless communication method.

[0023] Figure 11 This is a flowchart of a wireless communication method.

[0024] Figure 12 This is a diagram illustrating an example hardware implementation scheme for the example device. Detailed Implementation

[0025] The specific embodiments described below with reference to the accompanying drawings are intended as descriptions of various configurations and are not intended to represent the only configuration in which the concepts described herein can be practiced. The specific embodiments include detailed descriptions to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0026] Several aspects of a telecommunications system will now be presented with reference to various apparatuses and methods. These apparatuses and methods will be described in the detailed embodiments below and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements” below). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0027] As an example, an element, any part of an element, or any combination of elements can be implemented as a "processing system" including one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, system-on-a-chip (SoCs), baseband processors, field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in a processing system can execute software. Software should be interpreted broadly as instruction sets, code, code segments, program code, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable programs, threads in execution, procedures, functions, etc., regardless of whether it is referred to as software, firmware, middleware, microcode, hardware description languages, or otherwise.

[0028] Therefore, in one or more exemplary embodiments, the described functionality can be implemented using hardware, software, firmware, or any combination thereof. If implemented in software, the functionality can be stored on or encoded as one or more instructions or code on a computer-readable medium. A computer-readable medium includes a computer storage medium. The storage medium can be any available medium accessible to a computer. By way of example and not limitation, such a computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disc storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer-executable code accessible to a computer in the form of instructions or data structures.

[0029] While aspects and implementations are described herein by way of illustration of some examples, those skilled in the art will understand that additional implementations and use cases may arise in many different arrangements and scenarios. The innovative solutions described herein can be implemented on many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations and / or uses may be implemented via integrated chip embodiments and other devices based on non-modular components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / procurement devices, medical devices, artificial intelligence (AI) enabled devices, etc.). While some examples may or may not be specific to a particular use case or application, a wide variety of applicability to the described innovative solutions is possible. The scope of implementations can extend from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or original equipment manufacturer (OEM) devices or systems that incorporate one or more aspects of the described innovative solutions. In some practical settings, devices incorporating the described aspects and features may also include additional components and features for implementing and enforcing the claimed and described aspects. For example, the transmission and reception of wireless signals require several components (e.g., hardware components, including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.) for analog and digital purposes. It is anticipated that the innovative solutions described herein can be implemented in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or non-aggregated components, end-user equipment, etc., with different sizes, shapes, and structures.

[0030] Figure 1 This diagram illustrates an example of a wireless communication system and access network 100. The wireless communication system (also known as a wireless wide area network (WWAN)) includes base station 102, UE 104, evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). Base station 102 may include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells include base stations. Small cells include femtocells, picocells, and microcells.

[0031] Base station 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with EPC 160 via a first backhaul link 132 (e.g., S1 interface). Base station 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) can interface with core network 190 via a second backhaul link 184. Among other functions, base station 102 can also perform one or more of the following functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and device tracking, RAN information management (RIM), paging, location, and delivery of warning messages. Base station 102 can communicate with each other directly or indirectly (e.g., via EPC 160 or core network 190) via third backhaul link 134 (e.g., X2 interface). First backhaul link 132, second backhaul link 184 and third backhaul link 134 can be wired or wireless.

[0032] Base station 102 can wirelessly communicate with UE 104. Each base station 102 can provide communication coverage for a corresponding geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. The heterogeneous network can also include evolved home node B (eNB) (HeNB), which can provide services to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 can include uplink (UL) (also known as reverse link) transmission from UE 104 to base station 102 and / or downlink (DL) (also known as forward link) transmission from base station 102 to UE 104. The communication link 120 can use multiple-input multiple-output (MIMO) antenna technologies, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link can carry one or more carriers. Base station 102 / UE 104 can use spectrum allocated in carrier aggregation of up to Y x MHz (x component carriers) for transmission in each direction, with a bandwidth of up to Y MHz per carrier (e.g., 5, 10, 15, 20, 100, 400, etc.). Carriers may be adjacent to each other or not. Carrier allocation may be asymmetric relative to DL and UL (e.g., more or fewer carriers may be allocated to DL than to UL). Component carriers may include primary component carriers and one or more secondary component carriers. The primary component carrier may be referred to as the primary cell (PCell), and the secondary component carriers may be referred to as secondary cells (SCells).

[0033] Some UEs 104 can communicate with each other using device-to-device (D2D) communication link 158. D2D communication link 158 can use DL / UL WWAN spectrum. D2D communication link 158 can use one or more sidelink channels, such as the Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Control Channel (PSCCH). D2D communication can be conducted through various wireless D2D communication systems, such as WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0034] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154, for example, in an unlicensed spectrum of 5 GHz. When communicating in unlicensed spectrum, the STA 152 / AP 150 may perform a free channel assessment (CCA) to determine whether the channel is available before communication begins.

[0035] Small cell 102' can operate in licensed and / or unlicensed spectrum. When operating in unlicensed spectrum, small cell 102' can employ NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) as used by Wi-Fi AP 150. Small cell 102' employing NR in unlicensed spectrum can improve access network coverage and / or increase access network capacity.

[0036] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc., based on frequency / wavelength. In 5G NR, two initial operating bands have been designated as frequency range names FR1 (410MHz-7.125GHz) and FR2 (24.25GHz-52.6GHz). Although a portion of FR1 is greater than 6GHz, FR1 is generally (interchangeably) referred to as the "sub-6GHz" band in various documents and articles. Similar naming issues sometimes arise regarding FR2; although FR2 differs from the Extremely High Frequency (EHF) band (30GHz-300GHz) designated as a "millimeter wave" band by the International Telecommunication Union (ITU), FR2 is generally (interchangeably) referred to as the "millimeter wave" band in documents and articles.

[0037] Frequencies between FR1 and FR2 are generally referred to as intermediate frequency (IF) bands. Recent 5G NR studies have designated the operating bands of these IF bands as the frequency range name FR3 (7.125 GHz – 24.25 GHz). Bands falling within FR3 can inherit FR1 and / or FR2 characteristics, and thus can effectively extend the characteristics of FR1 and / or FR2 to IF band frequencies. Furthermore, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating frequency bands have been designated as the frequency range names FR4a or FR4-1 (52.6 GHz – 71 GHz), FR4 (52.6 GHz – 114.25 GHz), and FR5 (114.25 GHz – 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0038] In light of the foregoing, unless otherwise specifically stated, it should be understood that when the term "sub-6GHz" is used herein, it can broadly refer to frequencies that are less than 6GHz, within FR1, or may include intermediate frequency band frequencies. Furthermore, unless otherwise specifically stated, it should be understood that when the term "millimeter wave" is used herein, it can broadly refer to frequencies that may include intermediate frequency band frequencies, within FR2, FR4, FR4-a or FR4-1 and / or FR5, or within the EHF band.

[0039] Base station 102 (whether a small cell 102' or a large cell (e.g., a macro base station)) may include and / or be referred to as an eNB, g-node B (gNB), or another type of base station. Some base stations (such as gNB 180) may operate in the conventional sub-6 GHz spectrum, in millimeter-wave frequencies, and / or near-millimeter-wave frequencies to communicate with UE 104. When gNB 180 operates at millimeter-wave frequencies or near-mmW frequencies, gNB 180 may be referred to as a millimeter-wave base station. Millimeter-wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. Base station 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0040] Base station 180 can transmit beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 can receive beamformed signals from base station 180 in one or more receive directions 182'. UE 104 can also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 can receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 can perform beam training to determine the optimal receive and transmit directions for each of base station 180 / UE 104. The transmit and receive directions of base station 180 can be the same or different. The transmit and receive directions of UE 104 can be the same or different.

[0041] EPC 160 may include Mobility Management Entity (MME) 162, other MMEs 164, Serving Gateway 166, Multimedia Broadcast Multicast Service (MBMS) Gateway 168, Broadcast Multicast Service Center (BM-SC) 170, and Packet Data Network (PDN) Gateway 172. MME 162 can communicate with Home Subscriber Server (HSS) 174. MME 162 is the control node that handles signaling between UE 104 and EPC 160. Typically, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through Serving Gateway 166, which is itself connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation and other functions. PDN Gateway 172 and BM-SC 170 are connected to IP Service 176. IP Service 176 may include the Internet, intranet, IP Multimedia Subsystem (IMS), PS streaming service, and / or other IP services. The BM-SC 170 can provide functions for MBMS user service provisioning and delivery. The BM-SC 170 can serve as an entry point for content provider MBMS transmissions, authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and schedule MBMS transmissions. The MBMS gateway 168 can allocate MBMS services to base station 102 belonging to a Multicast-Broadcast Single Frequency Network (MBSFN) area belonging to a broadcast-specific service, and can be responsible for session management (start / stop) and collecting billing information related to eMBMS.

[0042] Core network 190 may include Access and Mobility Management Functions (AMF) 192, other AMFs 193, Session Management Functions (SMF) 194, and User Plane Functions (UDP) 195. AMF 192 can communicate with Unified Data Management (UDM) 196. AMF 192 is the control node that handles signaling between UE 104 and core network 190. Typically, AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are transmitted via UPF 195. UPF 195 provides UE IP address allocation and other functions. UPF 195 connects to IP service 197. IP service 197 may include the Internet, intranet, IP Multimedia Subsystem (IMS), Packet Switched (PS) Streaming (PSS) service, and / or other IP services.

[0043] Base stations may include and / or be referred to as gNB, Node B, eNB, access point, basic transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit / receive point (TRP), or any other suitable term. Base station 102 provides UE 104 with access to EPC 160 or core network 190. Examples of UE 104 include cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, GPS devices, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, meters, air pumps, large or small kitchen appliances, healthcare devices, implants, sensors / brakes, displays, or any other similar functional devices. Some UE 104 may be referred to as IoT devices (e.g., parking timers, air pumps, toasters, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, radio terminal, remote terminal, mobile phone, user agent, mobile client, client, or any other suitable term. In some scenarios, the term UE may also be applied to one or more accompanying devices, such as in a device constellation arrangement. One or more of these devices may jointly access the network and / or individually access the network.

[0044] Refer again Figure 1 In some aspects, UE 104 can be configured to request termination of FD operation based on the timing difference between the uplink receive timing and the downlink receive timing. For example, UE 104 may include a measurement component 198 configured to measure the timing difference between the uplink receive timing and the downlink receive timing during full-duplex operation. UE 104 can communicate with at least one Transmit Receive Point (TRP) during full-duplex operation. UE 104 can measure the timing difference between the uplink receive timing and the downlink receive timing during full-duplex operation. UE 104 can send a request to terminate full-duplex operation to at least one TRP based at least on the timing difference.

[0045] Refer again Figure 1In some aspects, base station 180 can be configured to terminate FD operation with the UE based at least on the timing difference between the uplink receive timing and the downlink receive timing. For example, base station 180 may include a request component 199 configured to receive a request to terminate FD operation. Base station 180 can communicate with the UE in full-duplex operation. Base station 180 can receive a request from the UE to terminate full-duplex operation based at least on the timing difference between the uplink receive timing and the downlink receive timing in full-duplex operation. Base station 180 can send an indication to the UE to terminate full-duplex operation.

[0046] Although the following description may focus on 5G / NR, the concepts described herein can be applied to other similar fields, such as LTE, LTE-A, CDMA, GSM and other wireless technologies.

[0047] Figure 2A Figure 200 shows an example of the first subframe within a 5G NR frame structure. Figure 2B Figure 230 shows an example of a DL channel within a 5G NR subframe. Figure 2C Figure 250 shows an example of a second subframe within a 5G NR frame structure. Figure 2D Figure 280 illustrates an example of a UL channel within a 5G NR subframe. The 5G NR frame structure can be Frequency Division Duplex (FDD), where subframes within a specific set of subcarriers (carrier system bandwidth) are dedicated to either DL or UL; or the 5G NR frame structure can be Time Division Duplex (TDD), where subframes within a specific set of subcarriers (carrier system bandwidth) are dedicated to both DL and UL. Figure 2A , 2C In the provided example, the 5G NR frame structure is assumed to be TDD type, where subframe 4 is configured with slot format 28 (primarily DL), where D is DL, U is UL, and F is flexible for use between DL / UL, and subframe 3 is configured with slot format 1 (all UL). Although subframes 3 and 4 are shown with slot formats 1 and 28 respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are all DL and all UL, respectively. Other slot formats 2-61 include a mixture of DL symbols, UL symbols, and flexible symbols. The UE is configured with a slot format by the received Slot Format Indicator (SFI) (dynamically via DL Control Information (DCI) or semi-statically / statically via Radio Resource Control (RRC) signaling. Note that the following description also applies to TDD type 5G NR frame structures.

[0048] Figures 2A-2DThe frame structure is illustrated, and aspects of this disclosure are applicable to other wireless communication technologies that may have different frame structures and / or different channels. A frame (10 ms) can be divided into 10 equal-sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-time slots, which may include 7, 4, or 2 symbols. Depending on whether the cyclic prefix (CP) is ordinary or extended, each time slot may include 14 or 12 symbols. For ordinary CP, each time slot may include 14 symbols, and for extended CP, each time slot may include 12 symbols. Symbols on the DL may be CP Orthogonal Frequency Division Multiplexing (OFDM) (CP-OFDM) symbols. Symbols on the UL may be CP-OFDM symbols (for high-throughput scenarios) or Discrete Fourier Transform (DFT) Extended OFDM (DFT-s-OFDM) symbols (also known as Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols) (for power-constrained situations; limited to single-stream transmission). The number of time slots within a subframe is based on the CP and the numbering scheme. The digital scheme defines the subcarrier spacing (SCS) and effectively defines the symbol length / duration, which is equal to 1 / SCS.

[0049]

[0050] For a standard CP (14 symbols / slot), different digital schemes μ0 through 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For an extended CP, digital scheme 2 allows 4 slots per subframe. Therefore, for both the standard CP and digital scheme μ, there are 14 symbols per slot and 2 slots per subframe. μ One time slot. The subcarrier spacing can be equal to 2. μ *15kHz, where μ represents digital schemes 0 through 4. Therefore, digital scheme μ = 0 has a subcarrier spacing of 15kHz, and digital scheme μ = 4 has a subcarrier spacing of 240kHz. The symbol length / duration is inversely proportional to the subcarrier spacing. Figures 2A-2D Examples of standard CP and digital scheme μ=2 are provided, where each time slot has 14 symbols and each subframe has 4 time slots. The time slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a set of frames, there can be one or more different bandwidth portions (BWPs) that are frequency-division multiplexed (see [link to relevant documentation]). Figure 2B Each BWP can have a specific numerical scheme and CP (normal or extended).

[0051] A resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also known as a physical RB (PRB)) extending for 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0052] like Figure 2A As shown, some REs carry reference (pilot) signals (RS) for the UE. RSs may include demodulation RS (DM-RS) (although indicated as an R for a specific configuration, other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. RSs may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0053] Figure 2B Examples of various DL channels within a subframe of a frame are shown. The Physical Downlink Control Channel (PDCCH) carries DCI in one or more Control Channel Elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE comprising 6 RE Groups (REGs), each REG comprising 12 consecutive REs in the OFDM symbol of the RB. A PDCCH within a BWP can be referred to as a Control Resource Set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., a common search space, a UE-specific search space) during PDCCH monitoring on the CORESET, where PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs can be located at higher and / or lower frequencies on the channel bandwidth. The Primary Synchronization Signal (PSS) can be within symbol 2 of a specific subframe of the frame. UE 104 uses the PSS to determine subframe timing / symbol timing and physical layer identity. The Secondary Synchronization Signal (SSS) can be within symbol 4 of a specific subframe of the frame. The UE uses the SSS to determine the Physical Layer Cell Identifier Group Number and radio frame timing. Based on the Physical Layer Identifier and the Physical Layer Cell Identifier Group Number, the UE can determine the Physical Cell Identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The Physical Broadcast Channel (PBCH) carrying the Master Information Block (MIB) can be logically grouped with the PSS and SSS to form a Synchronization Signal (SS) / PBCH block (also known as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the System Frame Number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information not transmitted via the PBCH (such as System Information Block (SIB)), and paging messages.

[0054] like Figure 2CAs shown, some REs carry DM-RS for channel estimation at the base station (although indicated as Rs for a specific configuration, other DM-RS configurations are possible). The UE can transmit DM-RS for the Physical Uplink Control Channel (PUCCH) and DM-RS for the Physical Uplink Shared Channel (PUSCH). PUSCH DM-RS can be transmitted in the first one or two symbols preceding the PUSCH. PUCCH DM-RS can be transmitted in different configurations depending on whether a short or long PUCCH is transmitted and the specific PUCCH format used. The UE can transmit a Sounding Reference Signal (SRS). SRS can be transmitted in the last symbol of a subframe. SRS can have a comb structure, and the UE can transmit SRS on one of the combs. SRS can be used by the base station for channel quality estimation to implement frequency-dependent scheduling on the UL.

[0055] Figure 2D Examples of individual UL channels within a subframe of a frame are shown. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and / or negative ACKs (NACK)). The PUCCH carries data and may also be used to carry buffer status reports (BSR), power clearance reports (PHR), and / or UCI.

[0056] Figure 3This is a block diagram illustrating communication between base station 310 and UE 350 in the access network. In the DL, IP packets from EPC 160 can be provided to controller / processor 375. Controller / processor 375 implements Layer 3 and Layer 2 functions. Layer 3 includes the Radio Resource Control (RRC) layer, and Layer 2 includes the Service Data Adaptation Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Media Access Control (MAC) layer. The controller / processor 375 provides RRC layer functions associated with broadcasting system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with upper-layer packet data unit (PDU) transmission, error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, reporting of scheduling information, error correction via HARQ, priority processing, and logical channel priority allocation.

[0057] Transmit (TX) processor 316 and receive (RX) processor 370 implement Layer 1 functions associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. TX processor 316 processes the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), and M-quadrature amplitude modulation (M-QAM)). The encoded and modulated symbols can then be divided into parallel streams. Each stream can then be mapped to OFDM subcarriers, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domains, and then combined using inverse fast Fourier transform (IFFT) to produce a physical channel carrying a stream of time-domain OFDM symbols. The OFDM streams are spatially precoded to produce multiple spatial streams. The channel estimate from channel estimator 374 can be used to determine coding and modulation schemes, as well as for spatial processing. The channel estimate can be derived from reference signals and / or channel condition feedback transmitted by UE 350. Each spatial stream can then be provided to different antennas 320 via separate transmitters 318TX. Each transmitter 318TX can modulate a radio frequency (RF) carrier with the corresponding spatial stream for transmission.

[0058] At UE 350, each receiver 354RX receives signals through its respective antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides this information to the receive (RX) processor 356. The TX processor 368 and RX processor 356 implement Layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for UE 350. If multiple spatial streams are destined for UE 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then uses a Fast Fourier Transform (FFT) to transform the OFDM symbol stream from the time domain to the frequency domain. The frequency domain signal consists of a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are recovered and demodulated by determining the most probable signal constellation point transmitted by base station 310. These soft decisions can be based on channel estimates calculated by channel estimator 358. The soft decision is then decoded and deinterleaved to recover the data and control signals originally transmitted by base station 310 on the physical channel. The data and control signals are then provided to controller / processor 359, which implements layer 3 and layer 2 functions.

[0059] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing, packet reassembly, decryption, header decompression, and control signal processing between transport and logical channels to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operation.

[0060] Similar to the functions described in conjunction with DL transmission performed by base station 310, controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with upper-layer PDU transmission, error correction via ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs to TBs, demultiplexing of MAC SDUs from TBs, reporting of scheduling information, error correction via HARQ, priority processing, and logical channel priority allocation.

[0061] The channel estimate derived by the channel estimator 358 from the reference signal transmitted by the base station 310 or feedback can be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial stream generated by the TX processor 368 can be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX can use the corresponding spatial stream to modulate an RF carrier for transmission.

[0062] UL transmission is processed at base station 310 in a manner similar to that described in conjunction with the receiver function at UE 350. Each receiver 318RX receives signals through its corresponding antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides that information to RX processor 370.

[0063] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing, packet reassembly, decryption, header decompression, and control signal processing between transport and logical channels to recover IP packets from the UE 350. IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operation.

[0064] At least one of the TX processor 368, RX processor 356, and controller / processor 359 can be configured to perform operations related to... Figure 1 The relevant aspects of 198.

[0065] At least one of the TX processor 316, RX processor 370, and controller / processor 375 can be configured to perform operations related to... Figure 1 The relevant aspects of 199.

[0066] In wireless communication systems supporting full-duplex (FD) communication, self-interference can be a problem that can affect FD communication. Self-interference can occur if the transmitted signal leaks to the receiving port of the transmitting device. Furthermore, the transmitted signal may be reflected back to the receiving port by objects, which can be referred to as clutter echo. Self-interference, and especially clutter echo, can be reduced by appropriately selecting transmit and receive beams, or more advanced transmit / receive beamforming, via spatial isolation, which can help support FD communication. FD communication allows simultaneous UL and DL transmissions in FR2, as well as different associated aspects of the process. Flexible TDD capabilities can exist at the base station (e.g., gNB or TRP) or the UE, or both. For example, in FD communication, a UE can transmit UL from one antenna panel and receive DL from another. FD communication can be conditioned on UL / DL beam separation. FD communication can result in reduced latency, allowing DL signals to be received in UL-only time slots. At least one other benefit is that FD communication can provide enhanced spectral efficiency (e.g., per-cell or per-UE), which can allow for more efficient resource utilization.

[0067] Downlink and uplink timing in FD communication should be aligned to mitigate or avoid inter-symbol interference or leakage in FD transmission. For example, when the base station is in FD operation, it can utilize the conventional timing advance (TA) mechanism to align timing. When the UE is in FD operation, or both at the UE and the base station, improper timing alignment at both the UE and the base station can lead to interference in FD transmission.

[0068] The aspects presented herein provide a configuration for triggering termination of FD operations based on timing events. For example, the aspects presented herein may allow the UE to request termination (e.g., abort) of the FD operation based on the timing difference between the uplink receive timing and the downlink receive timing. The aspects may also allow the base station to terminate (e.g., abort) the FD operation with the UE based at least on the timing difference between the uplink receive timing and the downlink receive timing.

[0069] Figure 4 Example 400 of uplink and downlink receive timing for half-duplex operation is shown. The base station can transmit and receive from a UE (e.g., UE1 or UE2). On the base station side, timing boundaries 402 should be aligned for downlink and uplink transmissions for all UEs communicating with the base station. For example, for downlink, timing boundary 402 could be time 0, which could be the start of a downlink subframe, and a propagation delay δ1 404 could be incurred for the UE to receive the downlink transmission. The round-trip time delay is twice the propagation delay δ1 404 used by the base station to receive the uplink transmission from the UE. Timing advance for the UE can be twice the propagation delay δ1 404, and the timing advance can be sent to the UE. The UE can apply the timing advance to its uplink transmissions to the base station based on the reception time of the downlink transmissions received by the UE. The timing advance can be based on the distance between the UE and the base station. UEs closer to the base station can have a smaller timing advance than UEs farther from the base station. For example, since a UE with timing advance δ2 406 is closer to the base station than a UE with timing advance δ1 404, timing advance δ2 406 can be less than timing advance δ1 404.

[0070] Figure 5 Example 500 of uplink receive timing and downlink receive timing for full-duplex operation is shown. Example 500 may include UE 502 and a first TRP (e.g., TRP1 504) and a second TRP (e.g., TRP2 504). UE 502 can communicate with TRP1 and TRP2 in full-duplex operation. UE 502 can receive downlink transmissions from TRP2 504, and UE 502 can send uplink transmissions to TRP1 504. TRP1 504 and TRP2 504 each have a timing boundary 506.

[0071] In full-duplex communication, the timing difference of beam pairs (e.g., uplink and downlink beam pairs) on the UE side should have been aligned in timing so that uplink transmission and downlink transmission can occur simultaneously. Misaligned timing may cause inter-symbol interference, which may degrade the quality of full-duplex communication. The sum of the receive timing of the uplink signal and the receive timing of the downlink signal should be less than the cyclic prefix (CP) length at the UE.

[0072] For example, the TRP1 504 may have a downlink symbol sent from the TRP1 504 or the associated base station, and the TRP1 504 may receive a transmission from the UE after the propagation delay b1 508. The TRP1 504 has a downlink receive timing t1_1. The TRP1 504 may determine the timing advance relative to the UE based on the combination of the propagation delay b1 508 and a1 510. Based on the combination of the propagation delays b2 516 and a2 518, the TRP2 504 may have a timing advance relative to the UE. The propagation delay a1 510 is the uplink transmission from the UE to the TRP1 504. The TRP1 504 may receive the uplink transmission from the UE near the timing boundary 506 plus the delta (increment) 512. At the UE, the UE may also receive its own uplink transmission to the TRP1 504 or the TRP2 504, which may be detected as direct leakage or may be detected as a reflected signal reflected back to the UE, and this reception may have a propagation delay c1 514 or c2 520.

[0073] The UE 502 may receive a downlink transmission from the TRP2 504 and may have a downlink receive timing b2 516. The sum of the downlink receive timing b2 516 at the UE 502 and the uplink receive timing c1 514 (e.g., the reflected signal) at the UE 502 should be less than the CP length at the UE 502. This is to ensure that OFDM orthogonality is maintained during FD operation, which minimizes inter-symbol interference or leakage to different frequency bands. The downlink receive time minus the uplink receive time or b2 + c1 – delta < CP. Delta is the one on the base station side and can help reduce the value of b2 + c1. The base station may provide a buffer amount or delta within the CP to help maintain timing in FD operation. Delta may allow the uplink transmission to be sent later in time compared to the original timing advance, such that the transmission can occur at the timing advance minus delta 512. The reception of its own uplink signal by the UE 502 may be c1 – delta 512. The value of delta 512 should be less than the CP so that the base station maintains orthogonality. However, if delta is not within the CP, the timing of FD communication may not be aligned.

[0074] If the uplink receive timing and downlink receive timing are not aligned, the UE can be configured to request a new TA or a new delta. However, if the delta within the base station's allowed timing is not available to satisfy the UE-side receive timing difference between the downlink and uplink signals, the UE can be configured to request termination of FD operation and switch to half-duplex. The UE can send a new TA request based on its timing measurements of uplink and downlink receive. The UE can perform the measurement via Layer 1 (L1) signal-to-interference-plus-noise ratio (SINR) (L1-SINR) measurement. In some aspects, the UE can be configured to wait for a period of time after a previous TA request to submit a new TA request. The period of time during which the UE can wait after a previous TA request to submit a new TA request can be pre-configured or signaled to the UE via Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI). In some aspects, if a new TA request is triggered multiple times by the UE during the period following a previous TA request while waiting to submit a new TA request (e.g., based on L1-SINR resource reception timing measurements), the UE can be configured to request termination of FD operation and switch to half-duplex. The UE can send a termination request to the base station, and in response to the base station receiving the request for termination of FD operation from the UE, the base station can provide the UE with an indication to terminate FD operation and switch to half-duplex.

[0075] Figure 6 This is a call flowchart 600 showing the signaling between UE 602 and base station 604. Base station 604 can be configured to provide at least one cell. UE 602 can be configured to communicate with base station 604. For example, in Figure 1 In the context of UE 604, base station 604 may correspond to base station 102 / 180, and therefore, a cell may include a geographical coverage area 110 in which communication coverage is provided and / or a small cell 102' having coverage area 110'. Furthermore, UE 602 may at least correspond to UE 104. In another example, in Figure 3 In the context of UE 604, UE 604 can correspond to UE 310, and UE 602 can correspond to UE 350.

[0076] As shown at 606, UE 602 communicates with at least one TRP in full-duplex (FD) operation. The at least one TRP may be associated with base station 604. In some aspects, UE 602 may communicate with a first TRP in FD operation. In some aspects, UE 602 may communicate with both a first TRP and a second TRP in FD operation. For example, in FD operation, the UE can receive downlink transmissions from the first TRP and can send uplink transmissions to the second TRP. In some aspects, the first TRP and the second TRP may be associated with corresponding base stations. In some aspects, the first TRP and the second TRP may be associated with base station 604.

[0077] As shown at 608, UE 602 can measure the timing difference between the uplink receive timing and the downlink receive timing during FD operation. In some aspects, the uplink receive timing can be measured in the sounding reference signal (SRS) transmitted from the uplink beam of UE 602 and received by the downlink beam of UE 602. In some aspects, the downlink receive timing can be measured in the channel state information reference signal (CSI-RS) transmitted from the TRP and received by the downlink beam of the UE.

[0078] As shown at 610, UE 602 can determine whether the timing difference exceeds a threshold. In some aspects, the threshold may include a cyclic prefix (CP) condition. In some aspects, the threshold includes a CP condition plus a delta timing advance (TA) value. The delta TA value may be within the CP condition on at least one TRP side. The delta TA value can be configured to reduce the timing difference between uplink receive timing and downlink receive timing to maintain full-duplex operation.

[0079] As shown at 612, UE 602 can send a request for an updated TA. UE 602 can send the request for the updated TA based on the timing difference between the uplink receive timing and the downlink receive timing. UE 602 can send the request for the updated TA to at least one base station 604. At least one base station 604 can receive the request for the updated TA. The request for the updated timing advance can be based at least on L1-SINR measurements. In some aspects, the transmission of the request for the updated TA can be sent after a period of time following the transmission of a previous request for the updated TA. The period of time for sending the request after the previous request can be pre-configured or configured by at least one base station. In some aspects, at least one base station 604 can signal to UE 602 via RRC signaling, MAC-CE, or DCI that the period of time for sending the request after the previous request is used. If multiple requests for an updated timing advance are triggered within a time period following the transmission of a previous request for an updated timing advance, a request to terminate full-duplex operation can be sent. Transmission of multiple requests for an updated timing advance can be avoided within a time period, which can be pre-configured from the base station to the UE via RRC, MAC-CE, or DCI signaling or signaled notification.

[0080] As shown at 614, UE 602 can send a request to terminate FD operation. UE 602 can send the request to terminate FD operation based at least on the timing difference. UE 602 can send the request to terminate FD operation to at least one TRP. The at least one TRP can be associated with base station 604. Base station 604 can receive the request to terminate FD operation. The base station can receive the request to terminate FD operation based at least on the timing difference between the uplink and downlink receive timings of the FD operation. In some aspects, the request to terminate full-duplex operation may include a request to switch to half-duplex operation. In some aspects, the reception of the request to terminate full-duplex operation by base station 604 may be based on the timing difference exceeding a threshold. The threshold may include a CP condition. In some aspects, the threshold may include a CP condition plus a delta TA value. The delta TA value may be within the CP condition on the base station side. The delta TA value may be configured to reduce the timing difference between the uplink and downlink receive timings to maintain full-duplex operation. In some aspects, uplink receive timing can be measured in the SRS transmitted from the uplink beam of UE 602 and received by the downlink beam of UE 602. In some aspects, downlink receive timing can be measured in the CSI-RS transmitted from the base station and received by the downlink beam of UE 602.

[0081] As shown at 616, base station 604 can send an indication to terminate FD operation. Base station 604 can send an indication to UE 602 to terminate FD operation. In response to receiving the FD termination request at 614, base station 604 can send an indication to terminate FD operation.

[0082] As shown at 618, UE 602 can switch to half-duplex (HD) operation. UE 602 can switch to HD operation in response to sending a request to terminate FD operation. In some aspects, UE 602 can switch to HD operation in response to receiving an FD termination indication from at least one TRP at 616. The FD termination indication may include an indication to terminate FD operation and switch to HD operation. Base station 604 can switch to HD operation in response to sending an indication to terminate FD operation. Base station 604 can switch to HD operation in response to sending an indication to UE 602 to terminate FD operation. After FD operation is terminated, UE 602 and base station 604 can communicate with each other in HD operation.

[0083] Figure 7 This is a flowchart 700 of a wireless communication method. The method can be performed by a UE or a component of a UE (e.g., UE104, 502, 602; device 902; cellular baseband processor 904; which may include memory 360, and which may be the entire UE 350 or components of UE 350, such as TX processor 368, RX processor 356, and / or controller / processor 359). One or more of the operations shown can be omitted, transposed, or performed simultaneously. The method allows the UE to request termination of FD operation based on the timing difference between the uplink receive timing and the downlink receive timing.

[0084] At point 702, the UE can communicate with at least one TRP in full-duplex (FD) operation. For example, 702 can be performed by the FD component 940 of device 902. In some aspects, the UE can communicate with a first TRP in FD operation. In some aspects, the UE can communicate with both a first and a second TRP in FD operation. For example, in FD operation, the UE can receive downlink transmissions from the first TRP and can send uplink transmissions to the second TRP.

[0085] At point 704, the UE can measure the timing difference between the uplink and downlink receive timings during FD operation. For example, 704 can be performed by the measurement component 942 of device 902. In some aspects, the uplink receive timing can be measured in the SRS transmitted from the UE's uplink beam and received by the UE's downlink beam. In some aspects, the downlink receive timing can be measured in the CSI-RS transmitted from the TRP and received by the UE's downlink beam.

[0086] At point 706, the UE may send a request to terminate FD operation. For example, 706 may be executed by the request component 946 of device 902. The UE may send the request to terminate FD operation based at least on a timing difference. The UE may send the request to terminate FD operation to at least one TRP. In some aspects, the request to terminate full-duplex operation may include a request to switch to half-duplex operation.

[0087] Figure 8 This is a flowchart 800 of a wireless communication method. The method can be performed by a UE or a component of a UE (e.g., UE104, 502, 602; device 902; cellular baseband processor 904; which may include memory 360, and which may be the entire UE 350 or components of UE 350, such as TX processor 368, RX processor 356, and / or controller / processor 359). One or more of the operations shown can be omitted, transposed, or performed simultaneously. The method allows the UE to request termination of FD operation based on the timing difference between the uplink receive timing and the downlink receive timing.

[0088] At point 802, the UE can communicate with at least one TRP in full-duplex (FD) operation. For example, 802 can be performed by the FD component 940 of device 902. In some aspects, the UE can communicate with a first TRP in FD operation. In some aspects, the UE can communicate with both a first and a second TRP in FD operation. For example, in FD operation, the UE can receive downlink transmissions from the first TRP and can send uplink transmissions to the second TRP.

[0089] At point 804, the UE can measure the timing difference between the uplink and downlink receive timings during FD operation. For example, 804 can be performed by the measurement component 942 of device 902. In some aspects, the uplink receive timing can be measured in the SRS transmitted from the UE's uplink beam and received by the UE's downlink beam. In some aspects, the downlink receive timing can be measured in the CSI-RS transmitted from the TRP and received by the UE's downlink beam.

[0090] At point 806, the UE can determine whether the timing difference exceeds a threshold. For example, 806 can be performed by the determining component 944 of device 902. In some aspects, the threshold may include a CP condition. In some aspects, the threshold includes the CP condition plus a deltaTA value. The deltaTA value may be within the CP condition on at least one TRP side. The deltaTA value can be configured to reduce the timing difference between the uplink receive timing and the downlink receive timing to maintain full-duplex operation.

[0091] At point 808, the UE can send a request for the updated timing advance. For example, 808 can be performed by the request component 946 of device 902. The UE can send the request for the updated timing advance based on the timing difference between the uplink receive timing and the downlink receive timing. The UE can send the request for the updated timing advance to at least one base station. The request for the updated timing advance can be based at least on L1-SINR measurements. In some aspects, the transmission of the request for the updated timing advance can be sent after a period of time following the transmission of a previous request for the updated timing advance. The period of time for sending the request after the previous request can be pre-configured or configured by at least one base station. In some aspects, at least one base station can signal to the UE via RRC signaling, MAC-CE, or DCI to the period of time for sending the request after the previous request. If multiple requests for the updated timing advance are triggered within a period of time following the transmission of a previous request for the updated timing advance, a request to terminate full-duplex operation can be sent. The transmission of multiple requests for an updated timing advance can be avoided within a time period, which can be pre-configured from the base station to the UE or signaled via RRC, MAC-CE, or DCI signaling.

[0092] At point 810, the UE may send a request to terminate FD operation. For example, 810 may be executed by the request component 946 of device 902. The UE may send the request to terminate FD operation based at least on a timing difference. The UE may send the request to terminate FD operation to at least one TRP. In some aspects, a request to terminate full-duplex operation may include a request to switch to half-duplex operation.

[0093] At point 812, the UE can switch to half-duplex (HD) operation. For example, 812 can be performed by the HD component 948 of device 902. The UE can switch to HD operation in response to sending a request to terminate FD operation. In some aspects, the UE can switch to HD operation in response to receiving an FD termination indication from at least one TRP. The FD termination indication may include an indication to terminate FD operation and switch to HD operation.

[0094] Figure 9 Figure 900 illustrates an example of a hardware implementation of device 902. Device 902 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, device 902 may include a cellular baseband processor 904 (also referred to as a modem) coupled to a cellular RF transceiver 922. In some aspects, device 902 may also include one or more Subscriber Identity Module (SIM) cards 920, an application processor 906 coupled to a Secure Digital Card (SD) card 908 and a screen 910, a Bluetooth module 912, a Wireless Local Area Network (WLAN) module 914, a Global Positioning System (GPS) module 916, or a power supply 918. Cellular baseband processor 904 communicates with UE 104 and / or BS 102 / 180 via cellular RF transceiver 922. Cellular baseband processor 904 may include computer-readable media / memory. The computer-readable media / memory may be non-transitory. Cellular baseband processor 904 is responsible for general processing, including executing software stored on the computer-readable media / memory. When executed by the cellular baseband processor 904, the software causes the cellular baseband processor 904 to perform the various functions described above. The computer-readable medium / memory can also be used to store data manipulated by the cellular baseband processor 904 during software execution. The cellular baseband processor 904 also includes a receiving component 930, a communication manager 932, and a transmitting component 934. The communication manager 932 includes one or more components shown. The components within the communication manager 932 can be stored in a computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 904. The cellular baseband processor 904 can be a component of the UE 350 and can include a memory 360 and / or at least one of a TX processor 368, an RX processor 356, and a controller / processor 359. In one configuration, the device 902 can be a modem chip and only includes the baseband processor 904, and in another configuration, the device 902 can be the entire UE (e.g., see...). Figure 3 (350), and includes an additional module of device 902.

[0095] Communication manager 932 includes FD component 940, which is configured to communicate with at least one TRP under FD operation, for example, as in combination Figure 7 702 or Figure 8 As described in 802. The communication manager 932 also includes a measurement component 942 configured to measure the timing difference between the uplink receive timing and the downlink receive timing of the FD operation, for example, as in conjunction with Figure 7 704 or Figure 8 As described in 804. The communication manager 932 also includes a determining component 944 configured to determine whether the timing difference exceeds a threshold, for example, as in conjunction with Figure 8As described in 806. The communication manager 932 also includes a request component 946 configured to send a request for terminating the FD operation, for example, as in conjunction with Figure 7 706 or Figure 8 As described in 810. The request component 946 can also be configured to send a request for the updated TA, for example, as in conjunction with... Figure 8 As described in 808. The communication manager 932 also includes an HD component 948, which is configured to switch to HD operation, for example, as in combination with Figure 8 As described in 812.

[0096] The apparatus may include execution Figure 7 and 8 Additional components for each box of the algorithm in the flowchart. Therefore, Figure 7 and 8 Each block in the flowchart can be executed by a component, and the apparatus can include one or more of these components. These components can be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for processor implementation, or a combination of the various methods described above.

[0097] As shown in the figure, device 902 may include various components for various functional configurations. In one configuration, device 902 (particularly cellular baseband processor 904) includes a unit for communicating with at least one TRP in full-duplex operation. The device includes a unit for measuring the timing difference between the uplink and downlink receive timings in full-duplex operation. The device includes a unit for sending a request to at least one TRP to terminate full-duplex operation based at least on the timing difference. The device also includes a unit for determining whether the timing difference exceeds a threshold. The device also includes a unit for sending a request for an updated timing advance to at least one base station based on the timing difference between the uplink and downlink receive timings. The device also includes a unit for switching to half-duplex operation in response to sending the request to terminate full-duplex operation. The device may be one or more components of device 902 configured to perform the functions described by the units. As described above, device 902 may include TX processor 368, RX processor 356, and controller / processor 359. Thus, in one configuration, the unit may be a TX processor 368, an RX processor 356, and a controller / processor 359, which are configured to perform the functions described by the unit.

[0098] Figure 10This is a flowchart 1000 of a wireless communication method. The method can be performed by a base station or a component of a base station (e.g., base station 102 / 180, 504, 604; device 1202; baseband unit 1204; which may include memory 376, and may be the entire base station 310 or components of base station 310, such as TX processor 316, RX processor 370, and / or controller / processor 375). One or more of the operations shown can be omitted, transposed, or performed simultaneously. The method allows the base station to terminate FD operation with the UE based at least on the timing difference between the uplink receive timing and the downlink receive timing.

[0099] At point 1002, the base station can communicate under FD operation. For example, 1002 can be performed by the FD component 1240 of device 1202. The base station can communicate with the UE under FD operation.

[0100] At point 1004, the base station can receive a request to terminate FD operation. For example, 1004 can be executed by the request component 1242 of device 1202. The base station can receive a request to terminate FD operation based at least on the timing difference between the uplink and downlink receive timings of the FD operation. The base station can receive the request to terminate FD operation from the UE. In some aspects, the request to terminate full-duplex operation may include a request to switch to half-duplex operation. In some aspects, the reception of the request to terminate full-duplex operation may be based on the timing difference exceeding a threshold. The threshold may include a CP condition. In some aspects, the threshold may include a CP condition plus a delta TA value. The delta TA value may be within the CP condition on the base station side. The delta TA value can be configured to reduce the timing difference between the uplink and downlink receive timings to maintain full-duplex operation. In some aspects, the uplink receive timing can be measured in the SRS transmitted from the uplink beam of the UE and received by the downlink beam of the UE. In some aspects, downlink reception timing can be measured in CSI-RS transmitted from the base station and received by the downlink beam of the UE.

[0101] At point 1006, the base station can send an indication to terminate the FD operation. For example, point 1008 can be executed by the indication component 1244 of device 1202. The base station can send an indication to the UE to terminate the FD operation.

[0102] Figure 11A flowchart 1100 illustrates a method for wireless communication. This method can be performed by a base station or components of a base station (e.g., base station 102 / 180, 504, 604; device 1202; baseband unit 1204; which may include memory 376, and may be the entire base station 310 or components of base station 310, such as TX processor 316, RX processor 370, and / or controller / processor 375). One or more of the operations shown may be omitted, transposed, or performed simultaneously. This method allows the base station to terminate FD operation with the UE based at least on the timing difference between the uplink receive timing and the downlink receive timing.

[0103] At 1102, the base station can communicate under FD operation. For example, 1102 can be performed by the FD component 1240 of device 1202. The base station can communicate with the UE under FD operation.

[0104] At 1104, the base station can receive a request to terminate FD operation. For example, 1104 can be executed by the request component 1242 of device 1202. The base station can receive the request to terminate FD operation based at least on the timing difference between the uplink and downlink receive timings of the FD operation. The base station can receive the request to terminate FD operation from the UE. In some aspects, the request to terminate full-duplex operation may include a request to switch to half-duplex operation. In some aspects, the reception of the request to terminate full-duplex operation may be based on the timing difference exceeding a threshold. The threshold may include a CP condition. In some aspects, the threshold may include a CP condition plus a delta TA value. This delta TA value may be within the CP condition at the base station side. This delta TA value may be configured to reduce the timing difference between the uplink and downlink receive timings to maintain full-duplex operation. In some aspects, the uplink receive timing can be measured in the SRS transmitted from the UE's uplink beam and received by the UE's downlink beam. In some aspects, downlink reception timing can be measured in CSI-RS transmitted from the base station and received by the downlink beam of the UE.

[0105] At 1106, the base station can receive a request for the updated timing advance. For example, 1106 can be executed by the request component 1242 of device 1202. The base station can receive the request for the updated timing advance based on the timing difference between the uplink and downlink receive timings. The base station can receive the request for the updated timing advance from the UE. The request for the updated timing advance can be based at least on L1-SINR measurements. In some aspects, the request for the updated timing advance can be sent after a period of time following the transmission of a previous request for the updated timing advance. The period of time for sending the request after the previous request can be pre-configured or configured by the base station. The base station can signal to the UE via RRC signaling, MAC-CE, or DCI that the period of time for sending the request after the previous request is used. In some aspects, if multiple requests for the updated timing advance from the UE are triggered within a period of time following the transmission of a previous request for the updated timing advance, the base station can receive a request to terminate full-duplex operation. The transmission of multiple requests for an updated timing advance can be avoided within a time period, which can be pre-configured from the base station to the UE or signaled via RRC, MAC-CE, or DCI signaling.

[0106] At point 1108, the base station can send an indication to terminate the FD operation. For example, 1108 can be performed by the indication component 1244 of device 1202. The base station can send an indication to the UE to terminate the FD operation.

[0107] At 1110, the base station can switch to HD operation. For example, 1110 can be performed by the HD component 1246 of device 1202. The base station can switch to HD operation in response to sending an instruction to terminate FD operation. The base station can switch to HD operation in response to sending an instruction to the UE to terminate FD operation.

[0108] Figure 12Figure 1200 illustrates an example of a hardware implementation scheme for device 1202. Device 1202 may be a base station, a component of a base station, or may implement base station functions. In some aspects, device 1002 may include a baseband unit 1204. Baseband unit 1204 may communicate with UE 104 via cellular RF transceiver 1222. Baseband unit 1204 may include computer-readable medium / memory. Baseband unit 1204 is responsible for general processing, including executing software stored on computer-readable medium / memory. When executed by baseband unit 1204, the software causes baseband unit 1202 to perform the various functions described above. Computer-readable medium / memory may also be used to store data manipulated by baseband unit 1204 during software execution. Baseband unit 1204 also includes a receiving component 1230, a communication manager 1232, and a transmitting component 1234. Communication manager 1232 includes one or more of the components shown. The components within the communication manager 1232 may be stored in a computer-readable medium / memory and / or configured as hardware within the baseband unit 1204. The baseband unit 1204 may be a component of the base station 310 and may include at least one of a memory 376, and / or a TX processor 316, an RX processor 370, and a controller / processor 375.

[0109] Communication manager 1232 includes FD component 1240, which can communicate under FD operation, for example, as in combination Figure 10 1002 or Figure 11 As described in 1102. The communication manager 1232 also includes a request component 1242, which can receive a request to terminate the FD operation, for example, as in conjunction with Figure 10 1004 or Figure 11 As described in 1104. Request component 1242 can also be configured to receive requests for the updated TA, for example, as in conjunction with... Figure 11 As described in 1106. The communication manager 1232 also includes an indication component 1244, which can send an indication for terminating FD operation, for example, as in conjunction with Figure 10 1006 or Figure 11 As described in 1108. The communication manager 1232 also includes an HD component 1246, which can be switched to HD operation, for example, as in combination with Figure 11 As stated in 1110.

[0110] The apparatus may include execution Figure 10 and 11 Additional components for each box of the algorithm in the flowchart. Therefore, Figure 10 and 11Each block in the flowchart can be executed by a component, and the apparatus can include one or more of these components. These components can be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for processor implementation, or a combination of the various methods described above.

[0111] As shown in the figure, device 1202 may include various components for various functional configurations. In one configuration, device 1202 (particularly baseband unit 1204) includes units for communicating with a UE in full-duplex operation. The device includes units for receiving from the UE a request to terminate full-duplex operation based at least on the timing difference between the uplink and downlink receive timings for full-duplex operation. The device includes units for sending an indication to the UE to terminate full-duplex operation. The device also includes units for receiving from the UE a request for updated timing advance based on the timing difference between the uplink and downlink receive timings. The device also includes units for switching to half-duplex operation in response to sending the indication to terminate full-duplex operation. These units may be one or more components of device 1202 configured to perform the functions described by the units. As described above, device 1202 may include a TX processor 316, an RX processor 370, and a controller / processor 375. Therefore, in one configuration, the unit may be a TX processor 316, an RX processor 370, and a controller / processor 375, which are configured to perform the functions described by the unit.

[0112] It should be understood that the specific order or hierarchy of the boxes in the disclosed process / flowchart is illustrative of an exemplary manner. Based on design preferences, it should be understood that the specific order or hierarchy of the boxes in the process / flowchart can be rearranged. Furthermore, some boxes may be combined or omitted. The appended method claims present the elements of the various boxes in an exemplary order and are not intended to limit one to the specific order or hierarchy presented.

[0113] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are to be consistent with the full scope of the language claims, wherein elements referenced in the singular are not intended to mean “one and only one” (unless specifically stated otherwise), but rather “one or more.” Terms such as “if,” “when,” and “while,” should be interpreted as “under the condition of,” rather than implying a direct temporal relationship or reaction. That is, these phrases (e.g., “when”) do not imply a response to the occurrence of the action or an immediate action taken during the occurrence of the action, but simply mean that the action will occur if a certain condition is met, without requiring a specific or immediate time limit for the occurrence of the action. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous to other aspects. Unless specifically stated otherwise, the term “some” means one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B, or C. All structural and functional equivalents of the elements throughout the various aspects described in this disclosure are known to or will subsequently be known to those skilled in the art, are expressly incorporated herein by reference, and are intended to be covered by the claims. Moreover, nothing disclosed herein is intended to be offered to the public, whether or not such disclosure is expressly recited in the claims. The terms “module,” “mechanism,” “element,” and “device” may not replace the word “unit.” Therefore, no claim can be made that an element should be interpreted as a functional module unless the element is explicitly described using the phrase “unit for…”.

[0114] The following aspects are illustrative only and may be combined with, but are not limited to, other aspects described or taught herein.

[0115] Aspect 1 is an apparatus for wireless communication at a UE, comprising at least one processor coupled to a memory and configured to: communicate with at least one TRP in full-duplex operation; measure a timing difference between uplink and downlink receive timing of the full-duplex operation; and send a request to the at least one TRP to terminate the full-duplex operation based at least on the timing difference.

[0116] Aspect 2 is the apparatus according to aspect 1, further comprising a transceiver coupled to the at least one processor.

[0117] Aspect 3 is the apparatus according to either aspect 1 or 2, further comprising: the request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

[0118] Aspect 4 is an apparatus according to any one of aspects 1-3, further comprising: the at least one processor being configured to determine whether the timing difference exceeds a threshold.

[0119] Aspect 5 is the apparatus according to any one of aspects 1-4, further comprising: the threshold including the CP condition.

[0120] Aspect 6 is an apparatus according to any one of aspects 1-5, further comprising: the threshold comprising a CP condition plus a delta TA value, wherein the delta TA value is within the CP condition at the at least one TRP, wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing to maintain the full-duplex operation.

[0121] Aspect 7 is the apparatus according to any one of aspects 1-6, further comprising: the UE communicating with a first TRP in the full-duplex operation, wherein the UE communicating with the first TRP and a second TRP in the full-duplex operation.

[0122] Aspect 8 is the apparatus according to any one of aspects 1-7, further comprising: the uplink reception timing being measured in an SRS transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

[0123] Aspect 9 is the apparatus according to any one of aspects 1-8, further comprising: the downlink reception timing being measured in CSI-RS transmitted from the TRP and received by the downlink beam of the UE.

[0124] Aspect 10 is an apparatus according to any one of aspects 1-9, further comprising: the at least one processor being configured to send a request for an updated timing advance to at least one base station based on the timing difference between the uplink reception timing and the downlink reception timing.

[0125] Aspect 11 is the apparatus according to any one of aspects 1-10, further comprising: the request for the updated timing advance is based at least on L1-SINR measurements.

[0126] Aspect 12 is the apparatus according to any one of aspects 1-11, further comprising: the transmission of the request for the updated timing advance is sent after a period of time following the transmission of the previous request for the updated timing advance.

[0127] Aspect 13 is an apparatus according to any one of aspects 1-12, further comprising: the time period for sending the request after the previous request is pre-configured or configured by the at least one base station, wherein the time period for sending the request after the previous request is signaled to the UE by the at least one base station via RRC signaling, MAC-CE or DCI.

[0128] Aspect 14 is an apparatus according to any one of aspects 1-13, further comprising: if, within the time period following the transmission of the previous request for the updated timing advance, a plurality of requests for the updated timing advance are triggered, then the request to terminate the full-duplex operation is sent, wherein the transmission of the plurality of requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled from the base station to the UE via RRC / MAC-CE / DCI signaling.

[0129] Aspect 15 is an apparatus according to any one of aspects 1-14, further comprising: the at least one processor being configured to switch to half-duplex operation in response to sending the request to terminate the full-duplex operation.

[0130] Aspect 16 is a method for implementing wireless communication in any of aspects 1-15.

[0131] Aspect 17 is a device for wireless communication, including units for implementing any of aspects 1-15.

[0132] Aspect 18 is a computer-readable medium storing computer-executable code, wherein when executed by a processor, the code causes the processor to implement any one of aspects 1-15.

[0133] Aspect 19 is an apparatus for wireless communication at a base station, comprising at least one processor coupled to a memory and configured to: communicate with a UE in full-duplex operation; receive from the UE a request to terminate the full-duplex operation based at least on a timing difference between an uplink reception timing and a downlink reception timing of the full-duplex operation; and send an instruction to the UE to terminate the full-duplex operation.

[0134] Aspect 20 is the apparatus according to aspect 19, and further includes a transceiver coupled to the at least one processor.

[0135] Aspect 21 is the apparatus according to any one of aspects 19 and 20, further comprising: the request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

[0136] Aspect 22 is the apparatus according to any one of aspects 19-21, further comprising: receiving the request to terminate the full-duplex operation based on the timing difference exceeding a threshold.

[0137] Aspect 23 is the apparatus according to any one of aspects 19-22, further comprising: the threshold including a CP condition or a CP condition plus a delta TA value, wherein the delta TA value is within the CP condition at the base station, wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing to maintain the full-duplex operation.

[0138] Aspect 24 is the apparatus according to any one of aspects 19-23, further comprising: the uplink reception timing being measured in an SRS transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

[0139] Aspect 25 is the apparatus according to any one of aspects 19-24, further comprising: the downlink reception timing being measured in CSI-RS transmitted from the base station and received by the downlink beam of the UE.

[0140] Aspect 26 is an apparatus according to any one of aspects 19-25, further comprising: the at least one processor being configured to receive from the UE a request for an updated timing advance based on the timing difference between the uplink reception timing and the downlink reception timing.

[0141] Aspect 27 is the apparatus according to any one of aspects 19-26, further comprising: the request for the updated timing advance is based at least on L1-SINR measurements.

[0142] Aspect 28 is the apparatus according to any one of aspects 19-27, further comprising: the request for the updated timing advance is sent after a period of time following the transmission of a previous request for the updated timing advance.

[0143] Aspect 29 is an apparatus according to any one of aspects 19-28, further comprising: the time period for sending the request after the previous request is pre-configured or configured by the base station, wherein the time period for sending the request after the previous request is signaled to the UE by the base station via RRC signaling, MAC-CE or DCI.

[0144] Aspect 30 is an apparatus according to any one of aspects 19-29, further comprising: if, during the time period following the transmission of the previous request for the updated timing advance, a plurality of requests from the UE for the updated timing advance are triggered, the request to terminate the full-duplex operation is received by the base station, wherein the transmission of the plurality of requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled from the base station to the UE via RRC signaling, MAC-CE, or DCI.

[0145] Aspect 31 is an apparatus according to any one of aspects 19-30, further comprising: the at least one processor being configured to switch to half-duplex operation in response to sending the instruction to terminate the full-duplex operation.

[0146] Aspect 32 is a set of methods for implementing wireless communication in any of aspects 19-31.

[0147] Aspect 33 is a device for wireless communication, including units for implementing any of aspects 19-31.

[0148] Aspect 34 is a computer-readable medium storing computer-executable code, wherein when executed by a processor, the code causes the processor to implement any one of aspects 19-31.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; as well as At least one processor, coupled to the memory and configured to: The UE communicates with at least one Transmit-Receive Point (TRP) in full-duplex operation. For the full-duplex operation at the UE, the timing difference between the uplink receive timing and the downlink receive timing at the UE is measured, wherein the uplink receive timing is associated with a sounding reference signal (SRS) transmitted by the uplink beam of the UE and received by the downlink beam of the UE. Determine whether the timing difference exceeds a threshold; and A request to terminate the full-duplex operation is sent to at least one TRP, based at least on the timing difference exceeding the threshold.

2. The apparatus of claim 1, further comprising a transceiver coupled to the at least one processor.

3. The apparatus according to claim 1, wherein, The request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

4. The apparatus according to claim 1, wherein, The threshold includes the cyclic prefix (CP) condition.

5. The apparatus according to claim 1, wherein, The threshold includes a cyclic prefix (CP) condition plus a delta timing advance (TA) value, wherein the delta TA value is within the CP condition at the at least one TRP, and wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing at the UE to maintain the full-duplex operation.

6. The apparatus according to claim 1, wherein, In order to communicate with at least one Transmitter-Receiver Point (TRP) in full-duplex operation at the UE, the at least one processor is configured to: Uplink transmission is sent to a first TRP associated with the full-duplex operation at the UE, wherein the uplink receive timing is based on timing advance (TA) associated with the first TRP; and Downlink transmissions are received from a second TRP associated with the full-duplex operation at the UE, wherein the downlink reception timing is based on the propagation delay associated with the second TRP.

7. The apparatus according to claim 1, wherein, The uplink receive timing at the UE is based on the SRS measurement transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

8. The apparatus according to claim 1, wherein, The downlink reception timing at the UE is measured based on a Channel State Information Reference Signal (CSI-RS) transmitted from the first TRP of the at least one TRP and received by the downlink beam of the UE.

9. The apparatus according to claim 1, wherein, The at least one TRP includes at least one base station, and wherein the at least one processor is further configured to: Based on the timing difference exceeding the threshold, a request for an updated timing advance is sent to the at least one base station to reduce the timing difference to below the threshold.

10. The apparatus according to claim 9, wherein, The request for the updated timing advance is based at least on the Layer 1 (L1) signal-to-interference-plus-noise ratio (SINR) (L1-SINR) measurement.

11. The apparatus according to claim 9, wherein, The transmission of the request for the updated timing advance is sent a period of time after the transmission of the previous request for the updated timing advance.

12. The apparatus according to claim 11, wherein, The time period for sending the request after the previous request is pre-configured or configured by the at least one base station, wherein the time period is signaled to the UE by the at least one base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

13. The apparatus according to claim 11, wherein, If, during the time period, multiple requests for the updated timing advance are triggered, then a request to terminate the full-duplex operation is sent, wherein the transmission of the multiple requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled to the UE by the at least one base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

14. The apparatus according to claim 1, wherein, The at least one processor is further configured to: In response to sending the request to terminate the full-duplex operation, switch to half-duplex operation.

15. A method for wireless communication at a user equipment (UE), comprising: The UE communicates with at least one Transmit-Receive Point (TRP) in full-duplex operation. For the full-duplex operation at the UE, the timing difference between the uplink receive timing and the downlink receive timing at the UE is measured, wherein the uplink receive timing is associated with a sounding reference signal (SRS) transmitted by the uplink beam of the UE and received by the downlink beam of the UE. Determine whether the timing difference exceeds a threshold; and A request to terminate the full-duplex operation is sent to at least one TRP, based at least on the timing difference exceeding the threshold.

16. The method according to claim 15, wherein, The request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

17. The method according to claim 15, wherein, The threshold includes the cyclic prefix (CP) condition.

18. The method according to claim 15, wherein, The threshold includes a cyclic prefix (CP) condition plus a delta timing advance (TA) value, wherein the delta TA value is within the CP condition at the at least one TRP, and wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing to maintain the full-duplex operation.

19. The method according to claim 15, wherein, The communication with at least one Transmitter-Receiver Point (TRP) in full-duplex operation at the UE also includes: Uplink transmission is sent to a first TRP associated with the full-duplex operation at the UE, wherein the uplink receive timing is based on timing advance (TA) associated with the first TRP; and Downlink transmissions are received from a second TRP associated with the full-duplex operation at the UE, wherein the downlink reception timing is based on the propagation delay associated with the second TRP.

20. The method of claim 15, wherein, The uplink receive timing at the UE is based on the SRS measurement transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

21. The method according to claim 15, wherein, The downlink reception timing at the UE is measured in the Channel State Information Reference Signal (CSI-RS) transmitted from the first TRP of the at least one TRP and received by the downlink beam of the UE.

22. The method according to claim 15, wherein, The at least one TRP includes at least one base station, and the method further includes: Based on the timing difference exceeding the threshold, a request for an updated timing advance is sent to the at least one base station to reduce the timing difference to below the threshold.

23. The method according to claim 22, wherein, The request for the updated timing advance is based at least on the Layer 1 (L1) signal-to-interference-plus-noise ratio (SINR) (L1-SINR) measurement.

24. The method according to claim 22, wherein, The transmission of the request for the updated timing advance occurs a period of time after the transmission of the previous request for the updated timing advance.

25. The method according to claim 24, wherein, The time period for sending the request after the previous request is pre-configured or configured by the at least one base station, wherein the time period is signaled to the UE by the at least one base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

26. The method according to claim 24, wherein, If, during the time period, multiple requests for the updated timing advance are triggered, then a request to terminate the full-duplex operation is sent, wherein the transmission of the multiple requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled to the UE by the at least one base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

27. The method of claim 15, further comprising: In response to sending the request to terminate the full-duplex operation, switch to half-duplex operation.

28. An apparatus for wireless communication at a base station, comprising: Memory; as well as At least one processor, coupled to the memory and configured to: Communicating with user equipment (UE) operating in full-duplex mode; At least based on the timing difference between the uplink receive timing and the downlink receive timing at the UE exceeding a threshold, in connection with the full-duplex operation at the UE, a request to terminate the full-duplex operation is received from the UE, wherein the uplink receive timing is associated with a sounding reference signal (SRS) transmitted by the uplink beam of the UE and received by the downlink beam of the UE; as well as Send an instruction to the UE to terminate the full-duplex operation.

29. The apparatus of claim 28, further comprising a transceiver coupled to the at least one processor.

30. The apparatus according to claim 28, wherein, The request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

31. The apparatus according to claim 28, wherein, The threshold includes a cyclic prefix (CP) condition or a cyclic prefix (CP) condition plus a delta timing advance (TA) value, wherein the delta TA value is within the CP condition at the base station, and wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing at the UE to maintain the full-duplex operation.

32. The apparatus according to claim 28, wherein, The uplink receive timing at the UE is based on the SRS measurement transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

33. The apparatus according to claim 28, wherein, The downlink reception timing at the UE is measured based on the Channel State Information Reference Signal (CSI-RS) transmitted from the base station and received by the downlink beam of the UE.

34. The apparatus according to claim 28, wherein, The at least one processor is further configured to: Based on the timing difference exceeding the threshold, the UE receives a request for an updated timing advance to reduce the timing difference to below the threshold.

35. The apparatus according to claim 34, wherein, The request for the updated timing advance is based at least on the Layer 1 (L1) signal-to-interference-plus-noise ratio (SINR) (L1-SINR) measurement.

36. The apparatus according to claim 34, wherein, The request for the updated timing advance is received a period of time after the previous request for the updated timing advance has been received.

37. The apparatus according to claim 36, wherein, The time period for sending the request after the previous request is pre-configured or configured by the base station, wherein the time period is signaled to the UE by the base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

38. The apparatus according to claim 36, wherein, If, during the time period, multiple requests from the UE for the updated timing advance are triggered, the request to terminate the full-duplex operation is received by the base station, wherein the transmission of the multiple requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled from the base station to the UE via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

39. The apparatus according to claim 28, wherein, The at least one processor is further configured to: In response to sending the instruction to terminate the full-duplex operation, switch to half-duplex operation.

40. A method for wireless communication at a base station, comprising: Communicating with user equipment (UE) operating in full-duplex mode; At least based on the timing difference between the uplink receive timing and the downlink receive timing at the UE exceeding a threshold, in connection with the full-duplex operation at the UE, a request to terminate the full-duplex operation is received from the UE, wherein the uplink receive timing is associated with a sounding reference signal (SRS) transmitted by the uplink beam of the UE and received by the downlink beam of the UE; as well as Send an instruction to the UE to terminate the full-duplex operation.

41. The method according to claim 40, wherein, The request to terminate the full-duplex operation includes a request to switch to half-duplex operation.

42. The method according to claim 40, wherein, The threshold includes a cyclic prefix (CP) condition or a cyclic prefix (CP) condition plus a delta timing advance (TA) value, wherein the delta TA value is within the CP condition at the base station, and wherein the delta TA value is configured to reduce the timing difference between the uplink receive timing and the downlink receive timing at the UE to maintain the full-duplex operation.

43. The method according to claim 40, wherein, The uplink receive timing at the UE is based on the SRS measurement transmitted from the uplink beam of the UE and received by the downlink beam of the UE.

44. The method of claim 40, wherein, The downlink reception timing at the UE is measured based on the Channel State Information Reference Signal (CSI-RS) transmitted from the base station and received by the downlink beam of the UE.

45. The method of claim 40, further comprising: Based on the timing difference exceeding the threshold, the UE receives a request for an updated timing advance to reduce the timing difference to below the threshold.

46. ​​The method according to claim 45, wherein, The request for the updated timing advance is based at least on the Layer 1 (L1) signal-to-interference-plus-noise ratio (SINR) (L1-SINR) measurement.

47. The method according to claim 45, wherein, The request for the updated timing advance is received a period of time after the previous request for the updated timing advance has been received.

48. The method according to claim 47, wherein, The time period for sending the request after the previous request is pre-configured or configured by the base station, wherein the time period is signaled to the UE by the base station via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

49. The method according to claim 47, wherein, If, during the time period, multiple requests from the UE for the updated timing advance are triggered, the request to terminate the full-duplex operation is received by the base station, wherein the transmission of the multiple requests for the updated timing advance is avoided during the time period, wherein the time period is pre-configured or signaled from the base station to the UE via at least one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE) (MAC-CE), or Downlink Control Information (DCI).

50. The method of claim 40, further comprising: In response to sending the instruction to terminate the full-duplex operation, switch to half-duplex operation.

51. A computer-readable medium storing computer-executable code, wherein, When the code is executed by the processor, the code causes the processor to implement the method according to any one of claims 15-27.

52. A computer-readable medium storing computer-executable code, wherein, When the code is executed by the processor, the code causes the processor to implement the method according to any one of claims 40-50.

53. An apparatus for wireless communication, comprising units for implementing the method according to any one of claims 15-27.

54. An apparatus for wireless communication, comprising units for implementing the method according to any one of claims 40-50.

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