Uplink timing associated with the Uplink Transport Configuration Indicator (TCI) status

Abstract

A method for wireless communication by a UE (User Equipment) includes setting timing parameters based on an uplink TCI (Transmission Configuration Indication) state. The method further includes adjusting the uplink transmission timing for uplink transmission based on the timing parameters.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Patent Application No. 17 / 189,049, filed March 1, 2021, entitled “UPLINK TIMING ASSOCIATED WITH UPLINK TRANSMISSION CONFIGURATION INDICATION (TCI) STATE,” which claims the benefit of U.S. Provisional Patent Application No. 63 / 002,238, filed March 30, 2020, entitled “UPLINK TIMING ASSOCIATED WITH UPLINK TRANSMISSION CONFIGURATION INDICATION (TCI) STATE,” the disclosure of which is expressly incorporated herein by reference in its entirety. Technical Field

[0003] In summary, various aspects of this disclosure relate to wireless communications, and more specifically, various aspects of this disclosure relate to associating uplink timing with uplink transmission configuration indication (TCI) status. 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 (e.g., bandwidth, transmit power, etc.). 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, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / Improved LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0005] Wireless communication networks may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, and an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The multiple access technologies described above have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global levels. New Radio (NR) (which can also be referred to as 5G) is a set of enhancements to the LTE mobile standard released by the 3rd Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Spread Spectrum OFDM (DFT-s-OFDM)) on the uplink (UL), thereby better supporting mobile broadband internet access, as well as beamforming, multiple-input multiple-output (MIMO) antenna technologies, and carrier aggregation.

[0007] Uplink communication currently supports only one transmit timing for each timing advance group (TAG). However, when the UE transmit configuration changes, this can cause timing jitter at the receiver side (e.g., the base station). For example, when the uplink transmit beam switches, the receiver timing may shift due to differences in propagation delay. Timing jitter in the receiver can lead to inter-symbol interference and / or inter-carrier interference and degrade overall system performance. Providing more flexible uplink timing determination for 5G NR communication would be desirable. Summary of the Invention

[0008] In one aspect of this disclosure, a method for wireless communication by a UE (User Equipment) includes setting timing parameters based on an uplink TCI (Transmission Configuration Indication) state. The method further includes adjusting uplink transmission timing for uplink transmission based on the timing parameters.

[0009] In another aspect of this disclosure, a UE (User Equipment) for wireless communication includes: a memory, and at least one processor operatively coupled to the memory. The memory and the processor are configured to set timing parameters based on an uplink TCI (Transmission Configuration Indication) state. The memory and the processor are also configured to adjust uplink transmit timing for uplink transmission based on the timing parameters.

[0010] In another aspect of this disclosure, a base station for wireless communication includes: a memory, and at least one processor operatively coupled to the memory. The memory and the processor are configured to: set timing parameters for a user equipment (UE) based on an uplink TCI (Transmission Configuration Indication) state. The memory and the processor are also configured to: adjust uplink transmission timing for uplink transmission based on the timing parameters.

[0011] In another aspect of this disclosure, a UE (User Equipment) includes: a unit for setting timing parameters based on an uplink TCI (Transmission Configuration Indication) state. The UE further includes: a unit for adjusting uplink transmission timing for uplink transmission based on the timing parameters.

[0012] In general, the aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment, and processing systems as generally described with reference to the accompanying drawings and description and as shown by reference to the accompanying drawings and description.

[0013] The features and technical advantages of examples according to this disclosure have been outlined quite extensively above to facilitate a better understanding of the specific embodiments described below. Additional features and advantages will be described. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the disclosed concepts (both their organization and manner of operation) and their associated advantages will be better understood when considered in conjunction with the accompanying drawings, based on the description below. Each drawing in the accompanying drawings is provided for illustrative and descriptive purposes and is not intended to define a limitation of the claims. Attached Figure Description

[0014] A detailed description can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings, so that the features of this disclosure can be understood in detail. However, it should be noted that the drawings illustrate only certain aspects of this disclosure and are therefore not intended to limit the scope of this disclosure, as the description may acknowledge other equally valid aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0015] Figure 1 This is a block diagram that conceptually illustrates an example of a wireless communication network according to various aspects of this disclosure.

[0016] Figure 2 This is a block diagram conceptually illustrating an example of a base station communicating with a user equipment (UE) in a wireless communication network according to various aspects of this disclosure.

[0017] Figure 3 is a diagram illustrating beam pairing according to certain aspects of this disclosure.

[0018] Figure 4 This is a diagram illustrating the uplink timing based on the strongest path, according to various aspects of this disclosure.

[0019] Figure 5A and 5B The timing of various aspects based on business type is shown in this disclosure.

[0020] Figure 6 This is a diagram illustrating example processes performed by a user equipment (UE) according to various aspects of this disclosure. Detailed Implementation

[0021] Various aspects of this disclosure have been described more fully with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented herein. Rather, these aspects are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings, those skilled in the art should recognize that the scope of this disclosure is intended to cover any aspect of the disclosure, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods practiced using structures, functions, or structures and functions other than or different from the aspects of the disclosure set forth. It should be understood that any aspect of the disclosed disclosure may be embodied by one or more elements of the claims.

[0022] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in detail below and illustrated in the accompanying drawings through various frames, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether such an element is implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0023] It should be noted that while this document may use terms commonly associated with 5G and subsequent wireless technologies to describe the aspects, the aspects of this disclosure can be applied to communication systems based on other generations, such as and including 3G and / or 4G technologies.

[0024] 5G NR supports the configuration of Transport Configuration Indication (TCI) states for Quasi-Co-location (QCL) indications of the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). Each TCI state consists of a set of downlink reference signals (RS) for different QCL types. Downlink reference signals can be synchronization signal blocks (SSBs), tracking reference signals (TRSs), and aperiodic / periodic / semi-persistent channel state information reference signals (CSI-RS). The QCL type indicates the time, frequency, and spatial relationship with the source reference signal. Exemplary QCL types are defined in Section 5.1.5 of 3GPP TR38.214 and include Type A (Doppler Shift, Doppler Spread, Average Delay, Delay Spread), Type B (Doppler Shift, Doppler Spread), Type C (Doppler Shift and Average Delay), and Type D (Spatial Rx (Receive) Parameters).

[0025] For DL ​​channel tracking, tracking reference signal (TRS) resources can be configured. Separate tracking loops (e.g., time, frequency, Doppler, and delay) can be maintained for each TRS. When configured in TCI state, each TRS can be used as a source reference signal (RS) (e.g., type A / C) for downlink (DL) timing.

[0026] 5G NR supports multiple DL timing references, with one DL timing reference per configured TRS. Each DL channel uses the appropriate timing reference as indicated by the TCI status. Multiple timing references are useful, for example, in multi-beam-based communication scenarios such as NR FR2 (frequency 2-millimeter wave). Each beampuppet link may experience different physical propagation paths and have different delays. Therefore, a separate TRS can be configured for each beampuppet link for time tracking.

[0027] Unlike DL, UL currently supports only one Tx (transmit) timing for each Timing Advance Group (TAG). However, when the UE Tx configuration changes, this can cause timing jitter at the receiver side (e.g., the base station). For example, when the UL Tx beams switch, the receiver timing may shift due to differences in propagation delay. Timing jitter in the receiver can lead to inter-symbol interference and / or inter-carrier interference and impair overall system performance. Advanced UE features supporting simultaneous transmission across multiple beams / panels may result in additional timing inaccuracies when using a single Timing Advance (TA) command (or transmit timing).

[0028] According to this disclosure, when the UL TCI framework is supported, UL timing determination for 5G NR is provided. More specifically, the UE adjusts its transmit timing based on the QCL type source RS indicated by the UL TCI state. That is, the UE adjusts its transmit timing according to the TCI. The UE can calculate the timing in different ways depending on the source reference signal. This disclosure contemplates any QCL type indicating time and frequency parameters, such as QCL types A, B, and C.

[0029] Figure 1 This diagram illustrates a network 100 in which various aspects of this disclosure can be practiced. Network 100 can be a 5G or NR network or some other wireless network (e.g., an LTE network). Wireless network 100 can include multiple base stations (BSs) 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and can also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0030] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a residential area) and can allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed User Group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femtocell BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably.

[0031] In some respects, the cell may not have to be stationary, and the geographical area of ​​the cell may be movable depending on the location of the mobile BS. In some respects, BSs may interconnect with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (e.g., direct physical connection using any suitable transport network, virtual network, etc.).

[0032] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit the data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions to other UEs. Figure 1 In the example shown, relay station 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay station can also be referred to as a relay BS, relay base station, repeater, etc.

[0033] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0034] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0035] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet device, camera, gaming device, netbook, smartbook, ultrabook, medical device or apparatus, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music or video device, or satellite wireless unit, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0036] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network such as the Internet or cellular networks) via wired or wireless communication links, for example. Some UEs can be considered Internet of Things (IoT) devices, and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be housed within a housing that contains the components of UE 120, such as processor components, memory components, etc.

[0037] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0038] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, mesh networks, etc.). In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere as being performed by base station 110.

[0039] As pointed out above, Figure 1 This is provided as an example only. Other examples may differ from those provided. Figure 1 The example described.

[0040] Figure 2 Base station 110 and UE 120 are shown (they can be...) Figure 1 The block diagram of design 200 (a base station 110 and a UE 120) is shown. Base station 110 may be equipped with T antennas 234a to 234t, and UE 120 may be equipped with R antennas 252a to 252r, wherein generally, T ≥ 1 and R ≥ 1.

[0041] At base station 110, transmitting processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from each UE, process (e.g., code and modulate) the data for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmitting processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI), etc.) and control information (e.g., CQI requests, permission, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmitting processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can (e.g., for OFDM, etc.) process its corresponding output symbol stream to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t respectively. According to the aspects described in more detail below, position coding can be used to generate synchronization signals to transmit additional information.

[0042] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor can determine the Received Reference Signal Power (RSRP), Received Signal Strength Indicator (RSSI), Received Reference Signal Quality (RSRQ), Channel Quality Indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in the housing.

[0043] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmitting processor 264 can also generate reference symbols for one or more reference signals. Symbols from the transmitting processor 264 can be pre-encoded (if applicable) by the TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 254, detected by MIMO detector 236 (if applicable), and further processed by receiving processor 238 to obtain decoded data and control information transmitted by UE 120. The receiver processor 238 can provide decoded data to the data sink 239 and decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicates with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0044] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2Any other components may perform one or more techniques associated with machine learning for nonlinearity, as described in more detail elsewhere. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can perform or direct, for example Figure 6 The operation of the process and / or other processes as described. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. Scheduler 246 may schedule the UE for data transmission on the downlink and / or uplink.

[0045] In some aspects, UE 120 may include: a unit for setting, a unit for adjusting, a unit for indicating, a unit for receiving, a unit for derivation, a unit for calculation, and a unit for continuing application. Such units may include combinations of... Figure 2 One or more components of the UE 120 described.

[0046] As pointed out above, Figure 2 This is provided as an example only. Other examples may differ from those provided. Figure 2 The example described.

[0047] In some cases, different types of devices supporting different types of applications and / or services can coexist in a cell. Examples of different types of devices include UE handheld devices, Customer Premises Equipment (CPE), vehicles, Internet of Things (IoT) devices, etc. Examples of different types of applications include Ultra Reliable Low Latency Communication (URLLC) applications, Massive Machine-Type Communication (mMTC) applications, Enhanced Mobile Broadband (eMBB) applications, Vehicle-to-Everything (V2X) applications, etc. Furthermore, in some cases, a single device can simultaneously support different applications or services.

[0048] As described above, 5G NR supports the configuration of Transport Configuration Indication (TCI) states for quasi-co-location (QCL) indications of the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). Each TCI state consists of a set of downlink reference signals (RS) for different QCL types. Downlink reference signals can be synchronization signal blocks (SSBs), tracking reference signals (TRSs), and aperiodic / periodic / semi-persistent channel state information reference signals (CSI-RS). The QCL type indicates the time, frequency, and spatial relationship with the source reference signal. Exemplary QCL types are defined in Section 5.1.5 of 3GPP TR38.214 and include Type A (Doppler shift, Doppler spread, average delay, delay spread), Type B (Doppler shift, Doppler spread), Type C (Doppler shift and average delay), and Type D (spatial Rx range).

[0049] For DL ​​channel tracking, tracking reference signal (TRS) resources can be configured. Separate tracking loops (e.g., time, frequency, Doppler, and delay) can be maintained for each TRS. When configured in TCI state, each TRS can be used as a source reference signal (RS) (e.g., type A / C) for downlink (DL) timing.

[0050] 5G NR supports multiple DL timing references, with one DL timing reference per configured TRS. Each DL channel uses the appropriate timing reference as indicated by the TCI status. Multiple timing references are useful, for example, in multi-beam-based communication scenarios such as NR FR2 (Frequency 2-millimeter Wave). Each beampuppet link may experience different physical propagation paths and have different delays. Therefore, a separate TRS can be configured for each beampuppet link for time tracking.

[0051] Figure 3 is a diagram illustrating beam pairing according to certain aspects of this disclosure. Referring to Figure 3, a first transmit beam (Tx beam 1) from base station (BS) 110 is paired with a first receive beam (Rx beam 1) at user equipment (UE) 120. The first transmit beam (Tx beam 1) is associated with a first CSI-RS (CSI-RS1) for beam management and a first tracking reference signal (TRS1) for delay. In this example, TCI state 1 is defined as: (CSI-RS1 for QCL-type D, TRS1 for QCL-type A). A second transmit beam (Tx beam 2) from base station 110 is paired with a second receive beam (Rx beam 2) at UE 120. The second transmit beam (Tx beam 2) is associated with a second CSI-RS (CSI-RS2) for beam management and a second tracking reference signal (TRS2) for delay. In this example, TCI state 2 is defined as: (CSI-RS2 for QCL-type D, TRS2 for QCL-type A). If the PDCCH and PDSCH are configured with TCI state 1, the UE uses the first receive beam (Rx beam 1) and the receive timing estimate from TRS1 to receive the PDCCH and PDSCH.

[0052] For uplink (UL) beam management, configuration is performed via Radio Resource Control (RRC) and the spatial relationships (UL spatial Tx parameters) to be used for UL transmission are indicated in the downlink (DL) control information. This is similar to QCL-type D (assuming beam correspondence) in DL.

[0053] UL timing determination in 5G NR is similar to that in LTE. NR uses timing advance (TA) commands from the base station to adjust UL transmit timing, where multiple timing advance groups (TAGs) are supported in carrier aggregation and dual connectivity scenarios. The same timing is assumed for the Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sounding Reference Signal (SRS) within the same TAG.

[0054] The desired uplink TCI framework is similar to the downlink TCI framework. For the uplink, other QCL types and different source RSs can be supported. Signaling aspects are also expected to be more symmetrical between the uplink and downlink.

[0055] To have a unified DL / UL TCI framework, the UL TCI includes a source RS to indicate the UL Tx beam used for the target UL RS / channel. The source RS can be SRS, SSB, and CSI-RS. The target UL RS / channel can be PUCCH, SRS, Physical Random Access Channel (PRACH), and PUSCH. Other QCL types similar to DL are also possible. Table 1 shows the possible TCI states for uplink communication.

[0056]

[0057] Unlike DL, UL currently supports only one Tx timing for each Timing Advance Group (TAG). However, when the UE Tx configuration changes, this can cause timing jitter at the receiver side (e.g., the base station). For example, when UL Tx beam switching occurs, receiver timing may shift due to differences in propagation delay. Timing jitter in the receiver can lead to inter-symbol interference and / or inter-carrier interference and impair overall system performance. Advanced UE features supporting simultaneous transmission across multiple beams / panels may result in additional timing inaccuracies when using a single Timing Advance (TA) command (or transmit timing).

[0058] According to this disclosure, when the UL TCI framework is supported, UL timing determination for 5G NR is provided. More specifically, the UE adjusts its transmit timing based on the QCL type source RS indicated by the UL TCI status. That is, the UE adjusts its transmit timing according to the TCI. The UE can calculate the timing in different ways depending on the source reference signal. This disclosure is intended for any QCL type indicating time and frequency parameters, such as QCL types A, B, and C.

[0059] Now consider two scenarios. If the QCL type source reference signal in the UL TCI is an SRS in the configured SRS resource set, then the UE follows the same transmission timing as the SRS resource set.

[0060] In the second case, the QCL-type source reference signal in the UL TCI is a DL RS, such as an SSB. In this second case, if the DL RS is a TRS (e.g., configurations 2, 3, and 4 in Table 1), the UE can calculate beam-specific delay adjustments based on the DL RS. The tracking reference signal (TRS) allows the UE to define timing parameters. Beam-specific delay adjustments can be applied to a common TA (timing advance) value to determine beam-specific transmit timing.

[0061] Different transmit timings can be calculated and applied for different uplink channels / SRS (e.g., UL TCI states). Each uplink beam can have its own uplink TCI state. However, the TCI state does not need to be different for each beam. Multiple beams can have the same uplink timing parameters. Channel / SRS (ULTCI State) i Launch timing The calculation is as follows:

[0062] ,

[0063] in, It is a common reference timing calculated / adjusted through the timing advance (TA) command used for timing advance groups (TAGs), and It is an adjustment for each channel / SRS (UL TCI state). The initial value can be zero (e.g., the same timing for all channels / SRS (UL TCI state) in TAG).

[0064] Each UL channel or SRS has a spatial QCL assumption, as shown in Table 2.

[0065]

[0066] According to various aspects of this disclosure, sub-TAG definitions are supported within a timing advance group (TAG). These sub-TAG definitions can be configured via RRC or updated / activated more dynamically using a Media Access Control-Control Element (MAC-CE). The UE can indicate support for sub-TAGs via capability signaling that includes a maximum number of sub-TAGs. The exchange of capability information between the base station and the UE occurs prior to the timing adjustment process. Each UL TCI state can be tagged using a sub-TAG index, and each sub-TAG can contain one or more UL TCI states.

[0067] New TA commands can be defined (e.g., carried in the MAC-CE or Downlink Control Information (DCI)). In the first option, the new Timing Advance (TA) command can include one or more sub-TAG indices to which the command is applied. Alternatively, a single MAC-CE can use multiple octets within the same MAC-CE to update multiple sub-TAG TA values. Traditional TA commands can still be universally applied to all sub-TAGs.

[0068] According to a further aspect of this disclosure, a new higher-layer parameter can be defined. This new parameter may be referred to as "timingReferenceRS". The new higher-layer parameter can indicate the SSB, CSI-RS (desirably, TRS), or SRS to which the TA command is applied. The UE measures the timingReferenceRS and estimates delay, spread, etc. The estimate is then applied to the UE timing.

[0069] For example, TRS1 and TRS2 can be configured for QCL-type C in UL TCI1 and TCI2, respectively. Assume TRS1 is configured as timingReferenceRS. Assume TRS1 and TRS2 have Δ based on the UE timing tracking loop. T Rx timing difference. Therefore, when the UE transmits a UL beam with TCI2, the UE applies compensation (e.g., T+Δ) above the current TA value T. T Assuming beam reciprocity. Details regarding TA compensation for timingReferenceRS are specified based on the UE implementation.

[0070] If the UL Tx beam is quasi-co-located with the DL RS (SSB or Non-Zero Power (NZP)-CSI-RS), timing adjustments can be calculated based on the Rx timing of the DL RS. If the UE is configured with a Tracking Reference Signal (TRS) that is spatially quasi-co-located with the same DL RS, Rx timing adjustments can be derived based on the time tracking loop or channel power delay profile (PDP) estimate associated with the TRS.

[0071] Figure 4 This is a diagram illustrating uplink timing based on the strongest path according to various aspects of this disclosure. An example for codebook-based PUSCH will now be provided. Along with the scheduling DCI, the UL beam is indicated by a QCL reference to the DL NZP-CSI-RS or SSB. The UE is configured with a TRS quasi-co-located with the same NZP-CSI-RS or SSB. The UE estimates the power delay profile (PDP) of the DL multipath channel based on the TRS, such as... Figure 4 As shown. The Rx reference time (time 0) is determined based on the Rx Fast Fourier Transform (FFT) timing. The strongest path delay or root mean square (RMS) delay spread can be used for UL timing adjustment based on the estimated PDP. ,in It is a scaling factor. For example, the estimated PDP can be scaled and used to adjust the timing parameters used for beamforming.

[0072] If the UL Tx beam is quasi-co-located with the DL RS, but there is no TRS quasi-co-located with the DL RS, or if the UL Tx beam is not quasi-co-located with the DL RS, then the UL is spatially quasi-co-located with the SRS resource. In some cases, the SRS (except for SRS-SetUse='nonCodebook') is not configured with a spatial relationship, for example, SRS-SpatialRelationInfo. For example, the UE may have performed autonomous beam selection (e.g., no prior SRS transmission). In this case, according to another aspect of this disclosure, timing adjustments can be calculated based on the Rx timing of one or more DL RSs. If the UE is configured with N ≥ 1 TRS resource, the UL timing adjustment can be determined as follows: .parameter This can be the average or median of the strongest path delay (or RMS delay spread) of N PDPs estimated through N TRSs. Parameter This can be the minimum of the strongest path delay (or RMS delay spread) of N PDPs estimated by N TRSs. In another configuration, the parameter... It could be the strongest path delay (or RMS delay spread) of a composite PDP of N PDPs, or a default value notified by the base station via signaling or specified in the 3GPP standard (possibly, ).

[0073] In some cases, the UE may not be able to apply different UL Tx timings to different UL channels and SRS (e.g., due to UE capability limitations). In such cases, the UE can use a single timing adjustment value. Applicable to all UL channels and SRS. Parameters It can be derived from the SSB or a configured DL RS (e.g., a TRS resource). Similar calculations as discussed above can be used. The UE can be configured by the base station to use a specific DL RS (or set of RSs) for timing calculations. Alternatively, a default DL RS can be specified in the 3GPP standard. In one example, the default DL RS is the TRS resource with the lowest ID.

[0074] According to another aspect of this disclosure, when UCI is transmitted on PUSCH (instead of PUCCH), PUSCH timing can be applied. That is, the PUSCH beam (e.g., TCI state) can be different from the PUCCH beam (e.g., TCI state). In this case, the TCI state (e.g., timing information) used for PUSCH is used for control information transmitted on PUSCH.

[0075] According to another aspect of this disclosure, timing can be altered when a Bandwidth Part (BWP) handover occurs. Therefore, the UE can use the timing from the original BWP during a grace period. The grace period is a time interval until the UE calculates a new reliable timing adjustment in the new BWP. The grace period can be part of the UE's capabilities or a configured parameter for BWP handover.

[0076] A further aspect of this disclosure addresses situations where an unpermitted ultra-reliable low-latency communication (URLLC) transmission from a UE punctures its own ongoing enhanced mobile broadband (eMBB) PUSCH transmission. In some cases, the UL Tx timing can differ between the original UL transmission and the unpermitted transmission. In such cases, to prevent puncturing, the unpermitted transmission can follow the timing of the original PUSCH.

[0077] Figure 5A and 5B The timeline based on business type is shown according to various aspects of this disclosure. For example... Figure 5A As shown, the URLLC Tx timing has a timing offset or timing difference relative to the eMBB transmission. The URLLC is transmitted at time t1, while symbol 2 of the eMBB transmission is transmitted at time t2. In this example, the timing offset (e.g., timing difference) is less than a threshold. According to various aspects of this disclosure, the URLLC Tx timing is shifted (shifted by the timing offset or timing difference) to follow the same Tx timing as the original eMBB Tx timing because the timing offset is less than the threshold. Therefore, in this aspect, the URLLC symbol is transmitted at time t2 instead of time t1.

[0078] Alternatively, if the time offset between two uplink transmissions is greater than a threshold, some samples of the original PUSCH can be discarded, such as... Figure 5B As shown. In the first example (a), symbol 2 of the Enhanced Mobile Broadband (eMBB) service is punctured by the Ultra Reliable Low Latency Communication (URLLC) service. In the first example (a), the URLLC Tx timing is shifted by a timing offset to follow the same Tx timing as the original eMBB Tx timing. In the second example (b), some samples of eMBB symbol 1, in addition to symbol 2, are discarded to fit the URLLC Tx timing. That is, in the second example (b), the URLLC timing is not shifted.

[0079] As noted above, Figure 3-5B is provided as an example. Other examples may differ from those described with respect to Figure 3-5B.

[0080] Figure 6This is a diagram illustrating, for example, an example procedure 600 performed by a UE according to various aspects of this disclosure. Example procedure 600 is an example of setting uplink timing associated with the uplink transmission configuration indication (TCI) state.

[0081] like Figure 6 As shown, in some aspects, process 600 may include setting timing parameters based on the uplink TCI (Transmission Configuration Indication) state (block 602). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) may set the timing parameters, or the base station (e.g., using antenna 234, MOD 232, TXMIMO processor 230, transmit processor 220, controller / processor 240, memory 242, etc.) may set the timing parameters.

[0082] like Figure 6 As shown, in some aspects, process 600 may include adjusting the uplink transmission timing for uplink transmission based on timing parameters (block 604). For example, a UE (e.g., using antenna 252, MOD 254, TX MIMO processor 266, controller / processor 280, memory 282, etc.) may adjust the uplink transmission timing, or a base station (e.g., using antenna 234, MOD 232, TX MIMO processor 230, transmit processor 220, controller / processor 240, memory 242, etc.) may adjust the uplink transmission timing.

[0083] Examples of implementation methods are described in the numbered clauses below:

[0084] 1. A method for wireless communication by a UE (User Equipment), comprising:

[0085] Timing parameters are set based on the uplink TCI (Transmission Configuration Indicator) status; and

[0086] The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

[0087] 2. The method according to Clause 1 further includes: setting the timing parameters based on a quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI state.

[0088] 3. The method according to Clause 1 or 2, wherein the QCL source reference signal includes SRS in a configured SRS (Probe Reference Signal) resource set, and wherein setting the timing parameters includes setting the timing parameters to match the timing advance of the SRS resource set.

[0089] 4. The method according to any of the preceding clauses, wherein setting the timing parameters includes setting the timing parameters by calculating beam-specific timing advance, wherein the QCL source reference signal includes a downlink reference signal, and the downlink reference signal includes a TRS (tracking reference signal), an SSB (synchronization block), or a CSI-RS (channel state information reference signal).

[0090] 5. The method according to any one of the preceding clauses further comprises: adjusting the uplink transmit timing for multiple uplink beams, each uplink beam having its own uplink TCI state.

[0091] 6. The method according to any of the preceding clauses further includes: indicating the maximum number of sub-timing advance groups (TAGs) supported by the UE.

[0092] 7. The method according to any of the preceding clauses further includes: receiving an indication of the number of sub-timing advance groups (TAGs) to be supported.

[0093] 8. The method according to any of the preceding clauses, wherein the timing advance command includes at least one sub-timing advance group (TAG) index, each sub-TAG including at least one uplink TCI state.

[0094] 9. The method according to any of the preceding clauses, wherein the Media Access Control-Control Element (MAC-CE) includes multiple Sub-Timing Advance Group (TAG) updates.

[0095] 10. The method according to any one of the foregoing clauses further comprises:

[0096] Receive indication of timing reference RS (reference signal);

[0097] Derive the timing estimation used for the timing reference RS; and

[0098] The timing parameters are adjusted based on the timing estimation.

[0099] 11. The method according to any one of the preceding clauses further comprises: adjusting the timing based on a time tracking loop or channel power delay profile estimate of a TRS (tracking reference signal) that is spatially quasi-co-located with the source downlink RS, wherein the source downlink RS is quasi-co-located with the uplink transmission.

[0100] 12. The method according to any one of the preceding clauses further comprises: calculating the timing adjustment based on timing estimates of at least one downlink reference signal when the source reference signal is not a tracking reference signal, or the source reference signal is a spatially quasi-co-located SRS (probe reference signal) with the uplink transmission and the SRS is not configured with spatial relation information.

[0101] 13. The method according to any of the preceding clauses, wherein the calculation is based on the minimum of timing estimates from a plurality of downlink reference signals or the average of timing estimates from the plurality of downlink reference signals.

[0102] 14. The method according to any one of the preceding clauses further comprises: adjusting the uplink timing for the Physical Uplink Shared Channel (PUSCH) based on parameters different from those used to adjust the timing for the Physical Uplink Control Channel (PUCCH), wherein the TCI state for the PUCCH is different from the TCI state for the PUSCH.

[0103] 15. The method described in any of the preceding clauses further includes: continuing to apply the adjusted uplink transmit timing for a period of time following the switching bandwidth portion (BWP).

[0104] 16. The method according to any of the preceding clauses, wherein the timing offset is less than a threshold, the method further comprising adjusting the timing parameters according to the timing offset and the transmission mode, the timing offset being between high-priority exempt transmission and low-priority transmission.

[0105] 17. The method according to any one of the foregoing clauses further comprises:

[0106] The timing parameters are set by measuring the source reference signal indicated by the uplink TCI status; and

[0107] The adjustment also includes adjusting all uplink beams using a single timing adjustment based on the measured source reference signal.

[0108] 18. An apparatus for a UE (User Equipment) for wireless communication, comprising:

[0109] Memory, and

[0110] At least one processor operatively coupled to the memory, the memory and the at least one processor being configured to:

[0111] Timing parameters are set based on the uplink TCI (Transmission Configuration Indicator) status; and

[0112] The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

[0113] 19. The apparatus according to Clause 18, wherein the at least one processor is further configured to set the timing parameters based on a quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI state.

[0114] 20. The apparatus according to clause 18 or 19, wherein the QCL source reference signal includes an SRS in a configured set of SRS (probe reference signals) resources, and wherein the at least one processor is further configured to set the timing parameters by setting the timing parameters to match the timing advance of the SRS resource set.

[0115] 21. The apparatus according to any one of claims 18-20, wherein the at least one processor is further configured to set the timing parameters by calculating a beam-specific timing advance, wherein the QCL source reference signal includes a downlink reference signal, the downlink reference signal including a TRS (tracking reference signal), an SSB (synchronization block), or a CSI-RS (channel state information reference signal).

[0116] 22. The apparatus according to any one of clauses 18-21, wherein the at least one processor is further configured to: adjust the uplink transmit timing for a plurality of uplink beams, each uplink beam having its own uplink TCI state.

[0117] 23. The apparatus according to any one of clauses 18-22, wherein the at least one processor is further configured to: indicate the maximum number of sub-timing advance groups (TAGs) supported by the UE.

[0118] 24. The apparatus according to any one of clauses 18-23, wherein the at least one processor is further configured to:

[0119] The timing parameters are set by measuring the source reference signal indicated by the uplink TCI status; and

[0120] Adjustments are made by adjusting the entire uplink beam using a single timing adjustment based on the measured source reference signal.

[0121] 25. An apparatus for a base station for wireless communication, comprising:

[0122] Memory, and

[0123] At least one processor operatively coupled to the memory, the memory and the at least one processor being configured to:

[0124] Setting timing parameters for the User Equipment (UE) based on the uplink TCI (Transmission Configuration Indication) state; and

[0125] The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

[0126] 26. The apparatus according to Clause 25, wherein the at least one processor is configured to receive from the UE an indication of the maximum number of sub-timing advance groups (TAGs) supported by the UE before setting the timing parameters.

[0127] 27. The apparatus according to clause 25 or 26, wherein the at least one processor is configured to: send an indication of the number of sub-timing advance groups (TAGs) to be supported.

[0128] 28. The apparatus according to any one of clauses 25-27, wherein the at least one processor is configured to: send a timing advance command including at least one sub-timing advance group (TAG) index, each sub-TAG including at least one uplink TCI state.

[0129] 29. The apparatus according to any one of clauses 25-28, wherein the at least one processor is configured to: send a Media Access Control-Control Element (MAC-CE) comprising multiple Sub-Timing Advance Group (TAG) updates.

[0130] 30. A UE (User Equipment) for wireless communication, comprising: a unit for performing the method according to any one of clauses 1 to 17.

[0131] 31. A non-transitory computer-readable medium storing code for wireless communication, said code comprising instructions executable by a processor to perform a method according to any one of clauses 1 to 17.

[0132] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made based on the foregoing disclosure, or modifications and variations may be derived from practice in the aspects.

[0133] As used, the term "component" is intended to be interpreted broadly as hardware, firmware, and / or a combination of hardware and software. As used, a processor is implemented in a combination of hardware, firmware, and / or hardware and software.

[0134] Some aspects are described in conjunction with thresholds. As used, depending on the context, satisfying a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0135] It will be apparent that the described systems and / or methods can be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The specific control hardware or software code used to implement these systems and / or methods is not limiting in any way. Therefore, while the operation and behavior of the systems and / or methods are described without reference to specific software code, it is to be understood that the software and hardware can be designed to implement the systems and / or methods, at least in part, based on the description.

[0136] Even specific combinations of features recited in the claims and / or disclosed in the specification are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways that are not specifically recited in the claims and / or specifically disclosed in the specification. While each dependent claim listed below may be directly dependent on only one claim, the disclosure of the aspects includes combinations of each dependent claim with every other claim in the claim set. The phrase “at least one of” in the list of items refers to any combination of those items, including single members. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0137] None of the elements, actions, or instructions used should be interpreted as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Additionally, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with “one or more.” Where only one item is anticipated, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “has,” “have,” “having,” etc., are intended to be open-ended terms. Additionally, unless explicitly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.”

Claims

1. A method for wireless communication by a UE (User Equipment), comprising: Timing parameters are set based on the quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI (Transmission Configuration Indication) state, which is marked by utilizing the sub-TAG index corresponding to the sub-TAG within the timing advance group (TAG); and The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

2. The method according to claim 1, wherein, The QCL source reference signal includes SRS in a configured SRS (sound reference signal) resource set, and wherein setting the timing parameters includes setting the timing parameters to match the timing advance of the SRS resource set.

3. The method according to claim 1, wherein, Setting the timing parameters includes setting the timing parameters by calculating beam-specific timing advance, wherein the QCL source reference signal includes a downlink reference signal, and the downlink reference signal includes a TRS (tracking reference signal), an SSB (synchronization block), or a CSI-RS (channel state information reference signal).

4. The method according to claim 1, further comprising: Adjust the uplink transmit timing for multiple uplink beams, each with its own uplink TCI state.

5. The method according to claim 1, further comprising: Indicates the maximum number of sub-TAGs supported by the UE.

6. The method according to claim 1, further comprising: Receive an instruction on the number of sub-TAGs to be supported.

7. The method according to claim 1, wherein, The timing advance command includes at least one sub-TAG index, and each sub-TAG includes at least one uplink TCI state.

8. The method according to claim 1, wherein, The Media Access Control-Control Element (MAC-CE) includes multiple sub-TAG updates.

9. The method according to claim 1, further comprising: Receive indication of timing reference RS (reference signal); Derive the timing estimation used for the timing reference RS; as well as The timing parameters are adjusted based on the timing estimation.

10. The method according to claim 1, further comprising: The timing is adjusted based on the time tracking loop or channel power delay profile estimate of the TRS (Tracking Reference Signal) that is spatially quasi-co-located with the source downlink RS, which is quasi-co-located with the uplink transmission.

11. The method according to claim 1, further comprising: When the source reference signal is not a tracking reference signal, or when the source reference signal is a spatially quasi-co-located SRS (probe reference signal) with the uplink transmission and the SRS is not configured with spatial relation information, the timing adjustment is calculated based on the timing estimate of at least one downlink reference signal.

12. The method according to claim 11, wherein, The calculation is based on the minimum of the timing estimates from multiple downlink reference signals or the average of the timing estimates from the multiple downlink reference signals.

13. The method according to claim 1, further comprising: The uplink timing for the Physical Uplink Shared Channel (PUSCH) is adjusted based on parameters that are different from those used to adjust the timing for the Physical Uplink Control Channel (PUCCH), wherein the TCI state for the PUCCH is different from the TCI state for the PUSCH.

14. The method according to claim 1, further comprising: The adjusted uplink transmit timing will continue to be applied for the period following the Bandwidth Switching Part (BWP).

15. The method according to claim 1, wherein, If the timing offset is less than a threshold, the method further includes adjusting the timing parameters based on the timing offset and the transmission mode, wherein the timing offset is between high-priority unpermitted transmission and low-priority transmission.

16. The method according to claim 1, further comprising: The timing parameters are set by measuring the source reference signal indicated by the uplink TCI status; as well as The adjustment also includes adjusting all uplink beams using a single timing adjustment based on the measured source reference signal.

17. An apparatus for a UE (User Equipment) for wireless communication, comprising: Memory, and At least one processor operatively coupled to the memory, the memory and the at least one processor being configured to: Timing parameters are set based on the quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI (Transmission Configuration Indication) state, which is marked by utilizing the sub-TAG index corresponding to the sub-TAG within the timing advance group (TAG); and The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

18. The apparatus according to claim 17, wherein, The QCL source reference signal includes SRS in a configured SRS (Probe Reference Signal) resource set, and wherein the at least one processor is further configured to set the timing parameters by setting the timing parameters to match the timing advance of the SRS resource set.

19. The apparatus according to claim 17, wherein, The at least one processor is further configured to set the timing parameters by calculating a beam-specific timing advance, wherein the QCL source reference signal includes a downlink reference signal, which includes a TRS (Tracking Reference Signal), an SSB (Synchronization Block), or a CSI-RS (Channel State Information Reference Signal).

20. The apparatus according to claim 17, wherein, The at least one processor is further configured to: adjust the uplink transmit timing for multiple uplink beams, each uplink beam having its own uplink TCI state.

21. The apparatus according to claim 17, wherein, The at least one processor is also configured to indicate the maximum number of sub-TAGs supported by the UE.

22. The apparatus according to claim 17, wherein, The at least one processor is further configured to: Receive an instruction on the number of sub-TAGs to be supported.

23. The apparatus according to claim 17, wherein, The timing advance command includes at least one sub-TAG index, and each sub-TAG includes at least one uplink TCI state.

24. The apparatus according to claim 17, wherein, The Media Access Control-Control Element (MAC-CE) includes multiple sub-TAG updates.

25. The apparatus according to claim 17, wherein, The at least one processor is further configured to: Receive indication of timing reference RS (reference signal); Derive the timing estimation used for the timing reference RS; and The timing parameters are adjusted based on the timing estimation.

26. The apparatus according to claim 17, wherein, The at least one processor is further configured to: The timing is adjusted based on the time tracking loop or channel power delay profile estimate of the TRS (Tracking Reference Signal) that is spatially quasi-co-located with the source downlink RS, which is quasi-co-located with the uplink transmission.

27. The apparatus according to claim 17, wherein, The at least one processor is further configured to: When the source reference signal is not a tracking reference signal, or when the source reference signal is a spatially quasi-co-located SRS (probe reference signal) with the uplink transmission and the SRS is not configured with spatial relation information, the timing adjustment is calculated based on the timing estimate of at least one downlink reference signal.

28. The apparatus according to claim 27, wherein, The calculation is based on the minimum of the timing estimates from multiple downlink reference signals or the average of the timing estimates from the multiple downlink reference signals.

29. The apparatus according to claim 17, wherein, The at least one processor is further configured to: The uplink timing for the Physical Uplink Shared Channel (PUSCH) is adjusted based on parameters that are different from those used to adjust the timing for the Physical Uplink Control Channel (PUCCH), wherein the TCI state for the PUCCH is different from the TCI state for the PUSCH.

30. The apparatus according to claim 17, wherein, The at least one processor is further configured to: The adjusted uplink transmit timing will continue to be applied for the period following the Bandwidth Switching Part (BWP).

31. The apparatus according to claim 17, wherein, The timing offset is less than a threshold, and the at least one processor is further configured to: The timing parameters are adjusted based on the timing offset and transmission mode, wherein the timing offset is between high-priority unpermitted transmission and low-priority transmission.

32. The apparatus according to claim 17, wherein, The at least one processor is further configured to: The timing parameters are set by measuring the source reference signal indicated by the uplink TCI status; and Adjustments are made by adjusting the entire uplink beam using a single timing adjustment based on the measured source reference signal.

33. An apparatus for a base station for wireless communication, comprising: Memory, and At least one processor operatively coupled to the memory, the memory and the at least one processor being configured to: Timing parameters for the User Equipment (UE) are set based on the quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI (Transmission Configuration Indication) state, which is marked by utilizing the sub-TAG index corresponding to the sub-TAG within the Timing Advance Group (TAG); and The uplink transmission timing for uplink transmission is adjusted based on the timing parameters.

34. The apparatus according to claim 33, wherein, The at least one processor is configured to receive from the UE an indication of the maximum number of sub-TAGs supported by the UE before setting the timing parameters.

35. The apparatus according to claim 33, wherein, The at least one processor is configured to send an indication of the number of sub-TAGs to be supported.

36. The apparatus according to claim 33, wherein, The at least one processor is configured to send a timing advance command including at least one sub-TAG index, each sub-TAG including at least one uplink TCI state.

37. The apparatus according to claim 33, wherein, The at least one processor is configured to send a Media Access Control-Control Element (MAC-CE) that includes updates to multiple sub-TAGs.

38. A UE (User Equipment) for wireless communication, comprising: A unit for setting timing parameters based on the quasi-co-located (QCL) source reference signal (RS) specified by the uplink TCI (Transmission Configuration Indication) state, which is marked by utilizing the sub-TAG index corresponding to the sub-TAG within the timing advance group (TAG); as well as A unit for adjusting the uplink transmission timing for uplink transmission based on the timing parameters.

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