Method and terminal device for wireless communication

Abstract

Provided are a method for wireless communication and a terminal device, the method comprising: a terminal device determining whether to use a first timing parameter based on a first condition, the first timing parameter being a timing parameter provided by a first cell, the first condition is associated with one or more of the following: information associated with cell switching of the terminal equipment; a moment when the first cell stops serving the terminal device; and the position of the terminal device. According to the embodiment of the invention, whether the first timing parameter is used or not is determined through the first condition, so that the validity or use method of the offset parameter can be determined.

Description

Method and terminal device for wireless communication Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method and terminal device for wireless communication. Background Art

[0002] Related technologies introduce offset parameters (also known as timing parameters) to enhance timing in NTN systems. In this case, how terminal devices determine the validity of the offset parameters, or how terminal devices use the offset parameters, is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a method and terminal device for wireless communication. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, comprising: a terminal device determines whether to use a first timing parameter based on a first condition, where the first timing parameter is a timing parameter provided by a first cell, wherein the first condition is associated with one or more of the following: information associated with cell switching of the terminal device; the moment when the first cell stops serving the terminal device; and the location of the terminal device.

[0006] According to a second aspect, a terminal device is provided, comprising: a determination unit for determining whether to use a first timing parameter based on a first condition, wherein the first timing parameter is a timing parameter provided by a first cell, wherein the first condition is associated with one or more of the following: information associated with the cell switching of the terminal device; the moment when the first cell stops serving the terminal device; and the location of the terminal device.

[0007] In a third aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0008] In a fourth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device. In another possible design, the system may also include other devices that interact with the terminal device in the solution provided in the embodiment of the present application.

[0009] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a terminal to execute part or all of the steps in the method of the first aspect above.

[0010] In a sixth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a terminal to perform some or all of the steps of the method of the first aspect described above. In some implementations, the computer program product may be a software installation package.

[0011] In a seventh aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in any one of the first aspects.

[0012] In an eighth aspect, an embodiment of the present application provides a chip comprising a memory and a processor, wherein the processor can call and run a computer program from the memory to implement some or all of the steps described in the method of the first aspect above.

[0013] In the embodiment of the present application, determining whether to use the first timing parameter through the first condition helps to determine the validity or usage method of the offset parameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a wireless communication system used in an embodiment of the present application.

[0015] FIG2A is an example diagram of uplink transmission delay when the TA mechanism does not exist.

[0016] FIG2B is an example diagram of uplink transmission delay in the presence of the TA mechanism.

[0017] FIG3 is a schematic diagram of a timing relationship in an NTN system.

[0018] FIG4 is a schematic diagram of another timing relationship in the NTN system.

[0019] FIG5 is a flow chart of a method for wireless communication provided in an embodiment of the present application.

[0020] FIG6 is a schematic diagram of a terminal device according to an embodiment of the present application.

[0021] FIG7 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in this application will be described below with reference to the accompanying drawings. To facilitate understanding of this application, the following describes a communication system applicable to an embodiment of this application with reference to FIG1 .

[0023] Figure 1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0024] FIG1 exemplarily shows a network device and two terminals. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0025] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0026] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0027] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0028] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station can also refer to a communication module, modem, or chip used to be provided in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0029] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0030] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0031] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0032] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0033] To facilitate understanding, the following introduces the relevant concepts and communication processes involved in the embodiments of the present application.

[0034] Currently, with the increasing demand for speed, latency, high-speed mobility, and energy efficiency, coupled with the increasing diversity and complexity of future services, the 3GPP international standards organization has begun developing 5G. The main application scenarios for 5G are: enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and massive machine-type communications (mMTC).

[0035] eMBB still aims to provide users with multimedia content, services, and data, and demand for this technology is growing rapidly. However, since eMBB can be deployed in diverse scenarios, such as indoors, in urban areas, and in rural areas, its capabilities and requirements vary significantly. Therefore, it cannot be generalized and requires detailed analysis based on specific deployment scenarios. Typical applications of URLLC include industrial automation, power automation, remote medical operations (surgery), and traffic safety. Typical characteristics of mMTC include high connection density, small data volumes, latency-insensitive services, low module costs, and long service life.

[0036] NR can also be deployed independently. In order to reduce air interface signaling and quickly restore wireless connections and data services in the 5G network environment, a new RRC state is defined, namely RRC inactive state (RRC_INACTIVE). This state is different from RRC idle state (RRC_IDLE) and RRC active state (RRC_ACTIVE). The following introduces these three states respectively.

[0037] The RRC connection state may refer to the state in which the terminal device is in when the RRC release is not performed after the random access process is completed. An RRC connection exists between the terminal device and a network device (e.g., an access network device). In the RRC connection state, the terminal device can transmit data with the network device, such as downlink data transmission and / or uplink data transmission. Alternatively, the terminal device can also transmit terminal device-specific data channels and / or control channels with the network device to transmit specific information or unicast information of the terminal device.

[0038] In the RRC connected state, the network device can determine the cell-level location information of the terminal device, that is, the network device can determine the cell to which the terminal device belongs. In the RRC connected state, after the terminal device moves, such as from one cell to another, the network device can control the terminal device to perform cell handover. Therefore, it can be seen that the mobility management of the terminal device in the RRC connected state may include cell handover. In addition, the mobility management of the terminal device in the RRC connected state can be controlled by the network device. Accordingly, the terminal device can switch to a designated cell according to the instructions issued by the network device.

[0039] The RRC idle state refers to the state of the terminal device when it is resident in a cell but is not performing random access. The terminal device usually enters the RRC idle state after being powered on or after RRC is released. In the RRC idle state, there is no RRC connection between the terminal device and the network device (such as the resident network device), the network device does not store the context of the terminal device, and no connection is established between the network device and the core network for the terminal device. If the terminal device needs to enter the RRC connected state from the RRC idle state, it is necessary to initiate the RRC connection establishment process.

[0040] In the RRC idle state, the core network (CN) can send a paging message to the terminal device, that is, the paging process can be triggered by the CN. Optionally, the paging area can also be configured by the CN. In some cases, for a terminal device in the RRC idle state, when the terminal device moves (for example, from one cell to another), the terminal device can initiate a cell reselection process. In other cases, for a terminal device in the RRC idle state, when the terminal device needs to access a cell, the terminal device can initiate a cell selection process. That is, the mobility management of the terminal device in the RRC idle state may include cell reselection and / or cell selection.

[0041] The RRC inactive state is defined to reduce air interface signaling, quickly restore wireless connections, and quickly resume data services. The RRC inactive state is a state between the connected and idle states. A terminal device previously entered the RRC connected state and then released the RRC connection with the network device, but the network device retained the terminal device's context. Furthermore, the connection established between the network device and the core network for the terminal device is not released. This means that the user plane and control plane bearers between the RAN and CN are still maintained, indicating a CN-NR connection.

[0042] In the RRC inactive state, the RAN can send a paging message to the terminal device, that is, the paging process can be triggered by the RAN. The RAN-based paging area is managed by the RAN, and the network equipment can know the location of the terminal device based on the RAN paging area level.

[0043] NTN

[0044] Currently, 3GPP is researching NTN technology. NTN generally uses satellite communications to provide communication services to users on the ground. Compared to terrestrial communication networks (for example, ground cellular networks), satellite communications offer many unique advantages.

[0045] First, satellite communications are not restricted by user geography. For example, conventional terrestrial communication networks cannot cover areas where network equipment cannot be deployed, such as oceans, mountains, and deserts. Similarly, terrestrial communication networks do not cover certain sparsely populated areas. However, because satellite communications can cover a large ground area and orbit the Earth, theoretically, every corner of the Earth can be covered by a satellite communication network.

[0046] Secondly, satellite communications have significant social value. They can provide low-cost coverage to remote, mountainous areas and impoverished countries and regions, enabling people in these areas to enjoy advanced voice communications and mobile internet technologies. From this perspective, satellite communications help narrow the digital divide with developed regions and promote their development.

[0047] Again, satellite communication has the advantage of long distance, and the increase in communication distance does not significantly increase the cost of communication.

[0048] Finally, satellite communications are highly stable and not affected by natural disasters.

[0049] Communication satellites are classified according to their orbital altitude into low Earth orbit (LEO), medium Earth orbit (MEO), geostationary Earth orbit (GEO), and high elliptical orbit (HEO). Currently, research focuses on LEO and GEO satellites.

[0050] LEO satellites typically operate at altitudes between 500 and 1500 km. Accordingly, their orbital period is approximately 1.5 to 2 hours. For LEO satellites, the signal propagation delay for single-hop communication between users is typically less than 20 milliseconds. The maximum satellite visibility time for LEO satellites is approximately 20 minutes. LEO satellites offer advantages such as short signal propagation distances, low link loss, and low transmit power requirements for user devices.

[0051] GEO satellites orbit at an altitude of 35,786 km. They orbit the Earth every 24 hours. For GEO satellites, the signal propagation delay for single-hop communication between users is typically about 250 milliseconds.

[0052] To ensure satellite coverage and increase the capacity of the entire satellite communication system, satellites typically use multiple beams to cover the ground. Therefore, a single satellite can form dozens or even hundreds of beams to cover the ground. A single satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0053] Timing Advance (TA)

[0054] Wireless communication systems (e.g., LTE / NR systems) can use orthogonal frequency division multiplexing (OFDM) transmission schemes. This is because wireless communication systems can only have good demodulation performance if the subcarriers maintain orthogonality. However, due to the existence of transmission delay, the downlink signal needs to be delayed before it can be received by the terminal device. Due to the different positions of different terminal devices relative to the network equipment, the time when the uplink signals sent by different terminal devices arrive at the network equipment will also be inconsistent, which will seriously affect the orthogonality between the subcarriers and reduce the demodulation performance of the OFDM transmission scheme.

[0055] Taking uplink transmission as an example, a key feature of uplink transmission is orthogonal multiple access (M2A) between different devices in time and frequency. This means that uplink transmissions from different devices in the same cell do not interfere with each other. Uplink transmissions are typically multi-device transmissions, so network equipment may receive signals from multiple devices simultaneously.

[0056] In order to ensure the orthogonality of uplink transmission and avoid intra-cell interference, the network equipment requires that the time when signals from different terminal devices at the same time but different frequency domain resources arrive at the network equipment is basically aligned. The reason why the network equipment requires that the time when signals from different terminal devices at the same time arrive at the network equipment is basically aligned is because as long as the network equipment receives the uplink data sent by the terminal device within the cyclic prefix range, it can correctly decode the uplink data. In addition, in order to maintain the orthogonality between uplink reference signals using different cyclic shifts, the network equipment also requires that the received uplink reference signals must be time-aligned. Therefore, in order to achieve uplink synchronization, or in other words, to ensure time synchronization on the network equipment side, the wireless communication system (for example, LTE / NR system) can support the uplink TA mechanism.

[0057] TA can be understood as a command sent by a network device to a terminal device to adjust the uplink transmission of the terminal device. The embodiment of the present application does not limit the uplink transmission of the terminal device. For example, the uplink transmission may include one or more of the following: physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), sounding reference signal (SRS), etc.

[0058] In a communication system that supports uplink TA, the uplink and downlink clocks on the network device are identical, while there is an offset between the uplink and downlink clocks on the terminal device. Different terminal devices have different uplink TA values. From the terminal device's perspective, the TA value is essentially the offset between the start time of the downlink frame received by the terminal device and the time it transmits the uplink frame. By appropriately controlling the offset for each terminal device, the network device can ensure that uplink signals from different terminal devices arrive at the network device at nearly the same time. Terminal devices farther from the network device experience greater transmission latency and therefore need to send uplink data earlier than terminal devices closer to the network device.

[0059] Figures 2A and 2B respectively show the time delay of the uplink signal reaching the network device in the absence of TA and the time delay of the uplink signal reaching the network device in the presence of TA. As shown in Figure 2A, in the absence of TA, the time at which the uplink signals sent by different terminal devices (for example, terminal devices at different distances from the network device) arrive at the network device is inconsistent, which may cause interference within the cell. After the introduction of TA, referring to Figure 2B, different terminal devices are configured with different uplink TAs, so that the time at which the uplink signals sent by different terminal devices arrive at the network device is consistent, which is conducive to avoiding interference within the cell. Taking the different terminal devices shown in Figure 2B as terminal device 1 and terminal device 2 as an example, if terminal device 1 and terminal device 2 receive downlink signals and send uplink signals synchronously, the uplink signals sent by terminal device 1 and terminal device 2 will be offset by 2Tp1 and 2Tp2 respectively with the network device, thereby ensuring that the uplink signals of terminal device 1 and terminal device 2 arrive at the network device at the same time. In other words, if terminal device 1 and terminal device 2 receive downlink signals and send uplink signals synchronously, then the TA amounts corresponding to terminal device 1 and terminal device 2 are 2Tp1 and 2Tp2 respectively, thereby ensuring that the uplink signals of terminal device 1 and terminal device 2 reach the network device at the same time.

[0060] The network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device. The network device can send a TA command to the terminal device to notify the terminal device of its corresponding TA value. For example, the network device can send a TA command to the terminal device in two ways, as follows:

[0061] Method 1: Acquisition of the initial TA: The terminal device can achieve initial uplink synchronization through a random access process. During the random access process, the network device can determine the TA value by measuring the received preamble and send it to the terminal device through the TA command (Timing Advance Command, TAC) field of the random access response (RAR) message. For example, the network device can carry a 12-bit TAC in the RAR message to indicate the initial TA to the terminal device.

[0062] Method 2, adjustment of TA in radio resource control (RRC) connection state: Although the terminal device and the network device have achieved uplink synchronization during the random access process, the timing of the uplink signal reaching the network device may change over time. Therefore, the terminal device needs to continuously update its uplink TA amount to maintain uplink synchronization. If the TA of a terminal device needs to be corrected, the network device can send a TA command to the terminal device, requiring it to adjust the uplink timing. In some implementations, the TA command is sent by the network device to the terminal device through a media access control control element (MAC CE). This MAC CE can also be called a TA command MAC CE (i.e., a MAC CE carrying a TA command). That is, when the terminal device is in the RRC connection state, the terminal device can adjust the uplink transmission according to the MAC CE carrying the TA command.

[0063] In a CA scenario, a terminal device may need to use different TAs for different uplink carriers. Therefore, the standard introduces timing advance groups (TAGs). Network equipment can configure up to four TAGs for each cell group of a terminal device, and a TAG associated with that serving group for each serving cell. In some implementations, the terminal device can maintain a separate TA for each TAG.

[0064] Timing relationship of NR system

[0065] In terrestrial communication systems, signal propagation delay is typically less than 1ms. In NTN systems, due to the long distances between terminal devices and satellites (or network equipment), signal propagation delay is significantly greater. For example, propagation delay can range from tens to hundreds of milliseconds, depending on the satellite's orbital altitude and the type of satellite communication service. To address this significant propagation delay, the timing relationship of NTN systems needs to be enhanced compared to NR systems.

[0066] As in the NR system, in the NTN system, the terminal device needs to consider the impact of TA when performing uplink transmission. Due to the large propagation delay in the NTN system, the range of TA values ​​is also relatively large. When the terminal device is scheduled to perform uplink transmission in time slot n, the terminal device can determine the uplink transmission timing based on the round-trip propagation delay (such as transmitting in advance during uplink transmission) so that the signal arrives at the base station side in time slot n of the uplink on the base station side. Specifically, the timing relationship in the NTN system can include two cases, as shown in Figures 3 and 4 respectively.

[0067] One scenario is that, like in NR systems, the downlink and uplink timeslots on the base station side of the NTN system are aligned (as shown in timeslot n in Figure 3). In this case, to align the terminal device's uplink transmission with the base station's uplink and downlink timeslots, the terminal device needs to use a larger TA value. During uplink transmission, a larger offset value, such as Koffset, is also required.

[0068] Another scenario is that, unlike the NR system, there is an offset between the downlink and uplink timeslots on the base station side (as shown in Figure 4). In this case, to align the terminal device's uplink transmission with the base station's uplink timeslot, the terminal device only needs to use a smaller TA value. However, in this case, the base station may require additional scheduling complexity to handle the corresponding scheduling timing.

[0069] Timing relationship of NR system

[0070] To ensure communication quality, relevant technologies define the timing relationship in the NR system. The following describes the physical downlink shared channel (PDSCH) reception timing, PUSCH transmission timing, hybrid automatic repeat request-ACKnowledgement (HARQ-ACK) transmission timing, media access control element (MAC CE) activation timing, channel state information (CSI) transmission timing, CSI reference resource timing, and aperiodic sounding reference signal (SRS) transmission timing.

[0071] PDSCH reception timing: When a UE is scheduled to receive PDSCH by downlink control information (DCI), the DCI includes the indication information of K0, which is used to determine the time slot for transmitting the PDSCH. For example, if the scheduling DCI is received on time slot n, the time slot allocated for PDSCH transmission is time slot Among them, K0 is determined according to the subcarrier spacing of PDSCH, μ PDSCH and μ PDCCH Used to determine the subcarrier spacing configured for PDSCH and PDCCH respectively. The value range of K0 is 0 to 32.

[0072] DCI-scheduled PUSCH transmission timing: When a UE is scheduled by DCI to transmit PUSCH, the DCI includes K2 indication information, which is used to determine the time slot for transmitting the PUSCH. For example, if the scheduling DCI is received on time slot n, the time slot allocated for PUSCH transmission is time slot Among them, K2 is determined according to the subcarrier spacing of PDSCH, μ PUSCH and μ PDCCH Used to determine the subcarrier spacing configured for PUSCH and PDCCH respectively. The value range of K2 is 0 to 32.

[0073] Transmission timing of PUSCH scheduled by RAR grant: For the time slot scheduled by RAR grant for PUSCH transmission, if after the UE initiates PRACH transmission, the UE receives the end position of the PDSCH including the corresponding RAR grant message in time slot n, then the UE transmits the PUSCH in time slot n+K2+Δ, where K2 and Δ are agreed upon by the protocol.

[0074] Timing of HARQ-ACK transmission on PUCCH: For the timeslots of PUCCH transmission, if a PDSCH reception ends in timeslot n or a PDCCH reception indicating a Semi-Persistent Scheduling (SPS) PDSCH release ends in timeslot n, the UE shall transmit the corresponding HARQ-ACK information on the PUCCH resources in timeslot n+K1, where K1 is the timeslot number and is indicated by the PDSCH-to-HARQ-timing-indicator information field in the DCI format or provided by the dl-DataToUL-ACK parameter. K1=0 corresponds to the last timeslot of PUCCH transmission overlapping with the timeslot of PDSCH reception or PDCCH reception indicating an SPS PDSCH release.

[0075] MAC CE activation timing: When the HARQ-ACK information corresponding to the PDSCH including the MAC CE command is transmitted on time slot n, the corresponding behavior indicated by the MAC CE command and the downlink configuration assumed by the UE should be activated from time slot n. The first time slot after Indicates the number of time slots in each subframe under the subcarrier spacing configuration μ.

[0076] CSI transmission timing on PUSCH: The CSI transmission timing on PUSCH is the same as the transmission timing of DCI-scheduled PUSCH transmission in general.

[0077] CSI reference resource timing: For CSI reporting in uplink time slot n′, the CSI reference resource is based on a single downlink time slot nn. CSI_ref Certain, among them, μ DL and μ UL The subcarrier spacing configurations for downlink and uplink respectively. CSI_ref The value of depends on the type of CSI reporting.

[0078] Aperiodic SRS transmission timing: If a UE receives a DCI triggering the transmission of aperiodic SRS in time slot n, the UE The aperiodic SRS in each triggered SRS resource set is transmitted on the network, where k is configured by the higher-layer parameter slotOffset in each triggered SRS resource set and is determined according to the subcarrier spacing corresponding to the triggered SRS transmission, μ SRS and μ PDCCH They are respectively the subcarrier spacing configuration of the triggered SRS transmission and the PDCCH carrying the triggering command.

[0079] Timing enhancement of NR systems

[0080] The PDSCH reception timing in the NR system is only affected by the timing of the downlink receiving side and is not affected by the large transmission round-trip delay in the NTN system. Therefore, the NTN system can reuse the PDSCH reception timing in the NR system.

[0081] For other timings affected by the interaction between downlink reception and uplink transmission, in order to work properly in the NTN system, or in order to overcome the large transmission delay in the NTN system, the timing relationship needs to be enhanced. A simple solution is to introduce an offset parameter K in the system. offset And apply this parameter to the relevant timing relationship. The following introduces how to use this offset parameter.

[0082] The transmission timing of the DCI-scheduled PUSCH (including the CSI transmitted on the PUSCH) is: If the scheduled DCI is received on time slot n, the time slot allocated for PUSCH transmission is time slot

[0083] RAR grant-scheduled PUSCH transmission timing: For the time slot scheduled by RAR grant for PUSCH transmission, the UE is in time slot n+K2+Δ+K offset The PUSCH is transmitted on the

[0084] Transmission timing of HARQ-ACK on PUCCH: For the time slot of PUCCH transmission, the UE should transmit HARQ-ACK in time slot n+K1+K offsetThe corresponding HARQ-ACK information is transmitted on the PUCCH resources within the HARQ-ACK channel.

[0085] MAC CE activation timing: When the HARQ-ACK information corresponding to the PDSCH including the MAC CE command is transmitted on time slot n, the corresponding behavior indicated by the MAC CE command and the downlink configuration assumed by the UE should be activated from time slot n. It takes effect from the first time slot after the UE is started, where X may be determined by the UE capability of the NTN and may not be 3.

[0086] CSI reference resource timing: For CSI reporting in uplink time slot n′, the CSI reference resource is based on a single downlink time slot. Sure.

[0087] Aperiodic SRS transmission timing: If a UE receives a DCI triggering the transmission of aperiodic SRS in time slot n, the UE The aperiodic SRS in each triggered SRS resource set is transmitted.

[0088] NTN cell system messages can broadcast a cell-level offset parameter, namely cell specific Koffset, K cell,offset In addition, for connected UEs, the network device can usually send a UE-specific offset parameter carried in the Differential Koffset MAC CE to the UE based on the TA reported by the UE. UE,offset , the offset parameter can be used to indicate the difference between the offset parameter used by the UE and the cell-level offset parameter. That is, the Koffset used by the UE is K offset =K cell,offset -K UE,offset For example, for PUSCH transmission scheduled by cell radio network temporary identifier (C-RNTI) PDCCH, K offset To determine the PUSCH transmission timing. In some other cases, such as for PUSCH transmission scheduled by random access response (RAR) UL grant, K cell,offset To determine the transmission timing of PUSCH.

[0089] It can be seen that when the NTN cell broadcasts the cell-level offset parameter and sends the UE-specific offset parameter (such as sending Differential Koffset MAC CE), the connected UE maintains K at the same time. cell,offset and Koffset , and is used for the timing of PUSCH transmission in different scheduling scenarios. Differential Koffset MAC CE is adjusted by the network device based on the TA reported by the UE. In other words, the network device adjusts K based on the difference between the TA value reported by the UE and the maximum TA value supported by the cell. UE,offset .

[0090] The TA value of a terminal device in different cells may vary, which means that the terminal device-specific offset parameter may also be different. Furthermore, the cell-level offset parameter may also vary in different cells. How the terminal device determines the validity of the offset parameter, or how the terminal device uses the offset parameter, is an issue that needs to be addressed.

[0091] For example, during the handover process, the TA value of the UE in the target cell may be different from the TA value of the source cell, and the maximum TA value supported by the target cell may also be different from that of the source cell. So during the handover process, how to determine the validity of the terminal device-specific offset parameter, or how to use the offset parameter, is a problem that needs to be solved. If the terminal device continues to use the terminal device-specific offset parameter received from the source cell after the handover, it may cause the PUSCH transmission timing in the target cell to fail. For example, using the K received from the source cell UE,offset and K broadcast by the target cell cell,offset The calculated Koffset may be smaller than the TA value of the terminal device in the target cell, which may cause the calculated PUSCH transmission timing scheduled by the C-RNTI PDCCH to be unusable.

[0092] In response to the above problems, an embodiment of the present application provides a method for wireless communication. In the embodiment of the present application, whether to use a first timing parameter is determined by a first condition, which helps to determine the validity or usage method of an offset parameter.

[0093] FIG5 is a flow chart of a wireless communication method according to an embodiment of the present application. The wireless communication method according to an embodiment of the present application will be described below with reference to FIG5.

[0094] 5 , in step S510 , the terminal device determines whether to use the first timing parameter based on a first condition.

[0095] The first timing parameter can be used to determine the timing during the communication process, such as the reception timing and / or transmission timing. For example, the first timing parameter can be used to determine the PDSCH reception timing, the PUSCH transmission timing, the HARQ-ACK transmission timing, the MAC CE activation timing, the CSI transmission timing, the CSI reference resource timing, and the SRS transmission timing.

[0096] In some embodiments, the first timing parameter can be applied to an NTN system to enhance the NTN system. That is, the first timing parameter can be used for a terminal device to communicate with a network device in a non-terrestrial network (NTN).

[0097] In this case, the first timing parameter may be, for example, the terminal device specific offset parameter K mentioned above. UE,offset The first timing parameter can be the K mentioned above. offset .

[0098] As mentioned above, the terminal device-specific offset parameters are adjusted based on the TA value. Generally speaking, the terminal device also maintains parameters associated with the TA, such as N TA Value. For example, N TA The value may be maintained by the TA command in the random access response and the TA command MAC CE. Therefore, in some embodiments, the first timing parameter may also be the above-mentioned parameter associated with the TA.

[0099] It should be noted that the first timing parameter may include one or more of the following: a terminal device specific offset parameter; an offset parameter K offset ; and parameters associated with TA.

[0100] In some embodiments, the first timing parameter may be a timing parameter provided by the first cell. For example, the first cell may be a serving cell of the terminal device. In a cell handover scenario, the first cell may also be a source cell of the terminal device.

[0101] In step S510, the terminal device not using the first timing parameter may mean that the terminal device does not use the first timing parameter for communication. For example, if other timing parameters are used for communication, the first timing parameter is invalid. The terminal device using the first timing parameter may mean that when the terminal device needs to communicate, it can determine the reception or transmission timing based on the first timing parameter.

[0102] In different usage scenarios, the terminal device may determine whether to use the first timing parameter, or determine the validity of the first timing parameter, based on different first conditions.

[0103] In some embodiments, the first condition may be associated with one or more of the following: information associated with cell switching of the terminal device; the moment when the first cell stops serving the terminal device; and the location of the terminal device.

[0104] In some embodiments, the first condition may be associated with the time when the first cell ceases serving the terminal device. For example, when the first cell ceases serving the terminal device, i.e., when the first cell reaches the time when the first cell ceases serving the terminal device, the terminal device does not use the first timing parameter, which helps avoid communication timing errors. Before the first cell ceases serving, the time when the service ceases is typically broadcast in a broadcast message. Therefore, the time when the first cell ceases serving the terminal device can typically be determined based on the broadcast message of the first cell.

[0105] As mentioned above, the timing parameters of a terminal device in different cells may be different. During a cell handover, the timing parameters maintained by the terminal device may be the timing parameters of the target cell or the timing parameters of the source cell. Therefore, the first condition may also be related to information associated with the cell handover of the terminal device.

[0106] Generally speaking, when a terminal device switches to a target cell, the terminal device cannot use the timing parameters of the source cell to avoid timing errors caused by timing parameter errors. Therefore, the first condition may include, for example, the terminal device receiving a handover command. The handover command mentioned here may include an RRC reconfiguration message and / or a cell handover command. The RRC reconfiguration message may, for example, be an RRC reconfiguration message containing a synchronous reconfiguration (reconfigurationWithSync). The cell handover command may, for example, be a cell handover command MAC CE.

[0107] For another example, the first condition may include completion of random access of the terminal device. As an example, for cell switching based on a random access channel, if the first condition is met, that is, after the terminal device completes random access, the terminal device does not use the first timing parameter.

[0108] For another example, the first condition may include the terminal device receiving the first information sent by the network device, wherein the first information is a message for responding to the completion of the handover. As an example, for RACH less cell handover, the terminal device may not perform the random access process. Therefore, if the first condition is met, that is, after the terminal device receives the above-mentioned first information sent by the network device, the terminal device does not use the first timing parameter. As another example, the first condition can also be applied to cell handover based on random access. That is, for cell handover based on random access, after the terminal device receives the above-mentioned first information sent by the network device, the terminal device does not use the first timing parameter.

[0109] For another example, the first condition may include that the terminal device is connected to the second cell. That is, when the terminal device is connected to a cell other than the first cell, the terminal device does not use the first timing parameter provided by the first cell.

[0110] For another example, the first condition may include that the terminal device completes handover from the first cell to the second cell. That is, when the terminal device completes handover from the first cell to the second cell, the terminal device does not use the first timing parameter provided by the first cell.

[0111] If a terminal device communicates with network equipment in an NTN, the terminal device's serving cell typically changes when the terminal device's serving satellite switches. Therefore, when the terminal device's serving satellite switches, the terminal device does not use the first timing parameters. In other words, when the terminal device switches from a first cell to a second cell, where the satellite corresponding to the first cell is different from the satellite corresponding to the second cell, the terminal device does not use the first timing parameters.

[0112] If a terminal device communicates with network equipment in an NTN, the terminal device's serving cell typically changes when the feeder link of the satellite to which the terminal device is connected switches, such as from gateway 1 to gateway 2. Therefore, when the feeder link of the satellite to which the terminal device is connected switches, the terminal device does not use the first timing parameters. In other words, when the terminal device switches from a first cell to a second cell where the feeder link of the satellite corresponding to the second cell is different from the feeder link of the satellite corresponding to the first cell, the terminal device does not use the first timing parameters.

[0113] In some embodiments, the first condition may be associated with the location of the terminal device.

[0114] For example, the first condition may be associated with the absolute position of the terminal device. As an example, when the absolute position of the terminal device is within the coverage of the second cell, the terminal device may not use the first timing parameter.

[0115] For another example, the first condition may be associated with the distance between the terminal device and a reference point. As an example, the reference point may be the cell center of the first cell for ease of implementation; the reference point may also be a cell edge of the first cell (e.g., a point on the edge of the first cell close to the second cell).

[0116] As an example, if the first condition is associated with the distance between the terminal device and the reference point, in response to the distance between the terminal device and the reference point being greater than a preset threshold, the terminal device does not use the first timing parameter.

[0117] To improve reliability, the reference point may further include a reference point of the first cell and a reference point of the second cell. When the distance between the terminal device and the reference point of the first cell and the distance between the terminal device and the reference point of the second cell both meet a preset threshold, the terminal device does not use the first timing parameter.

[0118] The above-mentioned preset threshold can be determined according to the usage scenario of the terminal device, and this application does not limit this.

[0119] It should be noted that the first condition may be any one of the above-mentioned first conditions, or may include multiple of the above-mentioned first conditions. For example, the first condition may include that the terminal device receives a handover command and that the distance between the terminal device and the reference point satisfies a preset threshold. For another example, the first condition may include that the terminal device receives a handover command and that the terminal device is connected to the second cell. When the first condition includes multiple conditions, when the contents of the first conditions are all met, the terminal device does not use the first timing parameter to improve reliability.

[0120] In some embodiments, the terminal device may further receive first indication information, such as first indication information sent by a network device, to determine whether a first timing parameter can be used, or a usage scheme for the timing parameter. For example, the first indication information is used to indicate one or more of the following: timing parameters used by the terminal device before cell handover; timing parameters used by the terminal device during cell handover; and timing parameters used by the terminal device after cell handover is completed.

[0121] In some embodiments, the first indication information may be carried in an RRC reconfiguration message or a cell switching command.

[0122] In some cases, when a terminal device switches from a first cell to a second cell, the terminal device can still use the first timing parameters. For example, for cell switching under the same satellite and network equipment, since the TA of the terminal device remains unchanged, the cell-level offset parameters may not change before and after the switch. Therefore, in this scenario, the terminal device can still use the timing parameters of the source cell. In other words, if the first cell and the second cell correspond to the same satellite and the same network equipment, then the terminal device can still use the first timing parameters provided by the first cell when switching from the first cell to the second cell.

[0123] If the cell switching is performed under different satellites, that is, the first cell and the second cell correspond to different satellites, then the terminal device does not use the first timing parameter.

[0124] Therefore, the first indication information can be used to determine the usage scheme of the timing parameters of the terminal device in the above two situations to ensure the accuracy of the transmission timing.

[0125] In addition, determining the timing parameters used by the terminal device through the first indication information is simple to implement and helps reduce the judgment overhead of the terminal device.

[0126] In some embodiments, if the first timing parameter is carried in the second information, then in response to the terminal device not using the first timing parameter, the RRC layer of the terminal device notifies the lower layer, such as the physical layer, to stop using the information contained in the second information. UE,offset For example, the second information may be Differential Koffset MAC CE. When the terminal device does not use the first timing parameter, the RRC layer of the terminal device may notify the physical layer to stop using the information included in the Differential Koffset MAC CE.

[0127] For example, the RRC layer of the terminal device notifying the lower layer to stop using the information included in the second information can be executed through a synchronous reconfiguration message. As an example, some operations of the terminal device performing synchronous reconfiguration are given below.

[0128] 1> If the access stratum (AS) security is not activated, perform the actions upon going to RRC_IDLE as specified in 5.3.11 with the release cause 'other' upon which the procedure ends;

[0129] 1> If timer T430 is running, stop timer T430 (stop timer T430 if running);

[0130] …

[0131] 2> If NTN-Config is configured for the target cell:

[0132] 3> start timer T430 with the timer value set to ntn-UlSyncValidityDuration from the subframe indicated by epochTime, according to the target cell NTN-Config;

[0133] 3>Indicates to lower layers to stop using / suspend / release the information regarding the Differential Koffset MAC CE.

[0134] As mentioned above, the timing parameter Koffset used by the UE can be K offset =K cell,offset -K UE,offset The K in this formula is defined in the related art as cell,offset Provided by the cell-level offset parameter (cellSpecificKoffset), K UE,offset Provided by Differential Koffset MAC CE signaling.

[0135] As can be seen from the above analysis, the first timing parameter, such as a terminal device-specific timing parameter, can be used in some cases but not in others. Therefore, to clarify how the first timing parameter is used, in some embodiments, the timing parameter used by the terminal device can be the timing parameter provided by the current serving cell. In other words, the terminal device uses the second timing parameter to communicate with the network device, and the second timing parameter is provided by the terminal device's current serving cell.

[0136] That is, the timing parameter Koffset used by the UE can be K offset =K cell,offset -K UE,offset Among them, K cell,offset Provided by the cell-level offset parameter (cellSpecificKoffset), K UE,offset Provided by the Differential Koffset MAC CE signaling of the serving cell.

[0137] The embodiments of the present application help avoid transmission failures of terminal devices by limiting whether to use the first timing parameters in different scenarios. For example, in a cell handover scenario, the embodiments of the present application help avoid PUSCH transmission timing failures of terminal devices in the target cell by limiting the use of the timing parameters provided by the source cell (i.e., the first cell).

[0138] It should be noted that the second timing parameter may be the first timing parameter or other timing parameters.

[0139] It should be noted that the aforementioned terminal device not using the first timing parameter can be replaced by the terminal device stopping using, ignoring, clearing, suspending or terminating the use of the first timing parameter.

[0140] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 5 . The device embodiment of the present application is described in detail below in conjunction with Figures 6 and 7 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0141] FIG6 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device shown in FIG6 includes: a determining unit 610 .

[0142] The determination unit 610 is used to determine whether to use a first timing parameter based on a first condition, where the first timing parameter is a timing parameter provided by the first cell, wherein the first condition is associated with one or more of the following: information associated with the cell switching of the terminal device; the moment when the first cell stops serving the terminal device; and the location of the terminal device.

[0143] In some embodiments, if the first condition is associated with information associated with the cell switching of the terminal device, the first condition includes one or more of the following: the terminal device receives a switching command; the random access of the terminal device is completed; the terminal device receives the first information sent by the network device; the terminal device is connected to the second cell; and the terminal device completes the switching from the first cell to the second cell; wherein the first information is a message used to respond to the completion of the switching.

[0144] In some embodiments, the handover command includes a radio resource control (RRC) reconfiguration message and / or a cell handover command.

[0145] In some embodiments, the satellite corresponding to the second cell is different from the satellite corresponding to the first cell.

[0146] In some embodiments, a feeder link of a satellite corresponding to the second cell is different from a feeder link of a satellite corresponding to the first cell.

[0147] In some embodiments, the first condition is associated with the position of the terminal device, including: the first condition is associated with the absolute position of the terminal device, and / or the first condition is associated with the distance between the terminal device and a reference point.

[0148] In some embodiments, if the first condition is associated with the distance between the terminal device and the reference point, the terminal device determines whether to use the first timing parameter based on the first condition, including: in response to the distance between the terminal device and the reference point being greater than a preset threshold, the terminal device does not use the first timing parameter.

[0149] In some embodiments, the reference point is the cell center of the first cell.

[0150] In some embodiments, the device also includes: a receiving unit for receiving first indication information, wherein the first indication information is used to indicate one or more of the following: the timing parameters used by the terminal device before cell switching; the timing parameters used by the terminal device during the cell switching process; and the timing parameters used by the terminal device after the cell switching is completed.

[0151] In some embodiments, the first indication information is carried in an RRC reconfiguration message or a cell switching command.

[0152] In some embodiments, the first timing parameter is carried in the second information, and the device further includes: a notification unit for, in response to the terminal device not using the first timing parameter, the RRC layer of the terminal device notifying the bottom layer to stop using the information contained in the second information.

[0153] In some embodiments, the device further comprises: a communication unit configured to communicate with a network device using a second timing parameter, where the second timing parameter is provided by a current serving cell of the terminal device.

[0154] In some embodiments, the first timing parameter includes an offset parameter specific to the terminal device and / or a parameter associated with a timing advance TA of the terminal device.

[0155] In some embodiments, the first timing parameter is used for the terminal device to communicate with a network device in a non-terrestrial network NTN.

[0156] Figure 7 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 7 indicate that the unit or module is optional. The device 700 may be used to implement the method described in the above method embodiment. The device 700 may be a chip or a terminal device.

[0157] The device 700 may include one or more processors 710. The processor 710 may support the device 700 to implement the method described in the method embodiment above. The processor 710 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0158] The apparatus 700 may further include one or more memories 720. The memories 720 store programs that can be executed by the processor 710, causing the processor 710 to perform the methods described in the above method embodiments. The memories 720 may be independent of the processor 710 or integrated into the processor 710.

[0159] The apparatus 700 may further include a transceiver 730. The processor 710 may communicate with other devices or chips via the transceiver 730. For example, the processor 710 may transmit and receive data with other devices or chips via the transceiver 730.

[0160] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal device provided in the present invention, and the program enables a computer to execute the method performed by the terminal device in each embodiment of the present invention.

[0161] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device provided in the present application, and the program causes a computer to execute the method performed by the terminal device in each embodiment of the present application.

[0162] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal device provided in the embodiments of the present application, and the computer program enables a computer to execute the method executed by the terminal device in each embodiment of the present application.

[0163] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0164] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0165] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0166] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0167] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0168] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0169] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0170] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0171] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0172] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0173] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0174] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0175] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for wireless communication, characterized in that: include: The terminal device determines whether to use a first timing parameter based on a first condition, where the first timing parameter is a timing parameter provided by the first cell, wherein the first condition is associated with one or more of the following: Information associated with cell switching of the terminal device; The time when the first cell stops serving the terminal device; and The location of the terminal device.

2. The method according to claim 1, characterized in that: If the first condition is associated with the information associated with the cell handover of the terminal device, the first condition includes one or more of the following: The terminal device receives a switching command; Random access of the terminal device is completed; The terminal device receives first information sent by the network device; The terminal device is connected to the second cell; and The terminal device completes handover from the first cell to the second cell; The first information is a message used to respond to the completion of the switching.

3. The method according to claim 2, characterized in that The handover command includes a radio resource control (RRC) reconfiguration message and / or a cell handover command.

4. The method according to claim 2 or 3, characterized in that: The satellite corresponding to the second cell is different from the satellite corresponding to the first cell.

5. The method according to claim 2 or 3, characterized in that: A feeder link of a satellite corresponding to the second cell is different from a feeder link of a satellite corresponding to the first cell.

6. The method according to any one of claims 1 to 5, characterized in that The first condition is associated with the location of the terminal device, including: The first condition is associated with the absolute position of the terminal device, and / or The first condition is associated with a distance between the terminal device and a reference point.

7. The method according to claim 6, characterized in that If the first condition is associated with the distance between the terminal device and the reference point, the terminal device determines whether to use the first timing parameter based on the first condition, including: In response to the distance between the terminal device and the reference point being greater than a preset threshold, the terminal device does not use the first timing parameter.

8. The method according to claim 7, characterized in that The reference point is the cell center of the first cell.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: The terminal device receives first indication information, where the first indication information is used to indicate one or more of the following: The timing parameters used by the terminal device before cell switching; Timing parameters used by the terminal device during cell switching; and The timing parameters used by the terminal device after the cell switching is completed.

10. The method according to claim 9, characterized in that The first indication information is carried in an RRC reconfiguration message or a cell switching command.

11. The method according to any one of claims 1 to 10, characterized in that The first timing parameter is carried in the second information, and the method further includes: In response to the terminal device not using the first timing parameter, the RRC layer of the terminal device notifies the lower layer to stop using the information included in the second information.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: The terminal device communicates with the network device using a second timing parameter, where the second timing parameter is provided by a current serving cell of the terminal device.

13. The method according to any one of claims 1 to 12, characterized in that The first timing parameter includes an offset parameter specific to the terminal device and / or a parameter associated with the timing advance TA of the terminal device.

14. The method according to any one of claims 1 to 13, characterized in that The first timing parameter is used for the terminal device to communicate with a network device in a non-terrestrial network NTN.

15. A terminal device, characterized in that: include: A determining unit, configured to determine whether to use a first timing parameter based on a first condition, where the first timing parameter is a timing parameter provided by the first cell, wherein the first condition is associated with one or more of the following: Information associated with cell switching of the terminal device; The time when the first cell stops serving the terminal device; and The location of the terminal device.

16. The device according to claim 15, characterized in that If the first condition is associated with the information associated with the cell handover of the terminal device, the first condition includes one or more of the following: The terminal device receives a switching command; Random access of the terminal device is completed; The terminal device receives first information sent by the network device; The terminal device is connected to the second cell; and The terminal device completes handover from the first cell to the second cell; The first information is a message used to respond to the completion of the switching.

17. The device according to claim 16, characterized in that The handover command includes a radio resource control (RRC) reconfiguration message and / or a cell handover command.

18. The device according to claim 16 or 17, characterized in that The satellite corresponding to the second cell is different from the satellite corresponding to the first cell.

19. The device according to claim 16 or 17, characterized in that A feeder link of a satellite corresponding to the second cell is different from a feeder link of a satellite corresponding to the first cell.

20. The device according to any one of claims 15 to 19, characterized in that The first condition is associated with the location of the terminal device, including: The first condition is associated with the absolute position of the terminal device, and / or The first condition is associated with a distance between the terminal device and a reference point.

21. The device according to claim 20, characterized in that If the first condition is associated with the distance between the terminal device and the reference point, the terminal device determines whether to use the first timing parameter based on the first condition, including: In response to the distance between the terminal device and the reference point being greater than a preset threshold, the terminal device does not use the first timing parameter.

22. The device according to claim 21, characterized in that The reference point is the cell center of the first cell.

23. The device according to any one of claims 15 to 22, characterized in that The device also includes: A receiving unit, configured to receive first indication information, where the first indication information is used to indicate one or more of the following: The timing parameters used by the terminal device before cell switching; Timing parameters used by the terminal device during cell switching; and The timing parameters used by the terminal device after the cell switching is completed.

24. The device according to claim 23, characterized in that The first indication information is carried in an RRC reconfiguration message or a cell switching command.

25. The device according to any one of claims 15 to 24, characterized in that The first timing parameter is carried in the second information, and the device further includes: A notification unit, used for, in response to the terminal device not using the first timing parameter, the RRC layer of the terminal device notifying the lower layer to stop using the information included in the second information.

26. The device according to any one of claims 15 to 25, characterized in that The device also includes: A communication unit is used to communicate with a network device using a second timing parameter, where the second timing parameter is provided by a current serving cell of the terminal device.

27. The device according to any one of claims 15 to 26, characterized in that The first timing parameter includes an offset parameter specific to the terminal device and / or a parameter associated with the timing advance TA of the terminal device.

28. The device according to any one of claims 15 to 27, characterized in that The first timing parameter is used for the terminal device to communicate with a network device in a non-terrestrial network NTN.

29. A terminal device, characterized in that: The invention comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory to execute the method according to any one of claims 1 to 14.

30. A device, characterized in that: The invention comprises a processor, which is used to call a program from a memory to execute the method according to any one of claims 1 to 14.

31. A chip, characterized in that: The device comprises a processor, which is used to call a program from a memory so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 14.

32. A computer-readable storage medium, characterized in that: A program is stored thereon, and the program enables a computer to execute the method according to any one of claims 1 to 14.

33. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 14.

34. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 14.

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