Method, device and readable storage medium for applying target satellite timing

Abstract

The application provides a method and device for applying target satellite timing and a readable storage medium, and relates to the technical field of communication. The method comprises the following steps: sending first indication information to a base station, wherein the first indication information is used for indicating that a UE acquires synchronization of a target satellite. The method solves the interference problem that may occur in a soft satellite switch scenario, thereby reducing the scheduling complexity of the base station.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a method, apparatus and readable storage medium for timing target satellites. Background Technology

[0002] In unchanged PCI scenarios (i.e., scenarios where the Physical Cell Identifier (PCI) remains unchanged), there is a situation called soft satellite switch. This occurs when sat1 (the source satellite) ceases service, while sat2 (the target satellite) has already begun coverage. Both sat1 and sat2 share coverage of a certain area of ​​the ground for a period of time. The time sat1 ceases service is t-service, and the time sat2 begins service is t-start. <t-service。

[0003] In soft satellite switch scenarios, between t-start and t-service, both the source and target satellites provide services to the UE simultaneously. During this period, the UE can perform synchronization with the target satellite. However, whether the UE can immediately apply the downlink timing and / or timing advance (TA) after obtaining the target satellite's downlink timing requires further discussion. Analysis suggests the following problems with immediate application: the timing at which each UE obtains synchronization with the target satellite is not consistent. For example, if a UE immediately sends a preamble according to the target satellite's timing after completing downlink synchronization; or, if the UE immediately performs uplink and downlink transmissions according to the target satellite's timing and TA after completing downlink synchronization and obtaining TA without RACH, the network (referring to the base station) is unaware of when the UE obtained downlink and / or uplink synchronization. If the UE decides to perform uplink and downlink transmissions according to the target satellite's timing, it may interfere with UEs performing uplink and downlink transmissions according to the source satellite's timing and TA, thereby increasing network scheduling complexity.

[0004] Therefore, existing technologies cannot effectively solve the interference problems that may occur in the soft satellite switch scenario, thereby increasing the scheduling complexity of the base station. Summary of the Invention

[0005] This application provides a method, apparatus, and readable storage medium for timing target satellites, which solves the interference problem that may occur in softsatellite switch scenarios, thereby reducing the scheduling complexity of base stations.

[0006] In a first aspect, this application provides a method for timing using a target satellite, the method being executed by a terminal UE, the method comprising:

[0007] Send a first indication message to the base station, the first indication message being used to instruct the UE to obtain synchronization with the target satellite.

[0008] Optionally, the first indication information includes any of the following:

[0009] Instruct the UE to obtain downlink synchronization from the target satellite;

[0010] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0011] Instruct the UE to obtain uplink synchronization from the target satellite.

[0012] In this embodiment, by sending a first indication message to the base station, the UE is instructed to obtain downlink synchronization and / or uplink synchronization of the target satellite. Specifically, obtaining downlink synchronization of the target satellite means obtaining the downlink timing of the target satellite, and obtaining uplink synchronization of the target satellite means obtaining the TA of the target satellite. Specifically, obtaining the downlink timing of the target satellite means obtaining the downlink timing for transparent forwarding by the base station through the target satellite, and obtaining the TA of the target satellite means obtaining the TA for accessing the base station through the target satellite. In this way, the network (here referring to the base station, which will not be elaborated further below) knows when the UE has obtained downlink synchronization (here referring to obtaining the downlink timing of the target satellite) and / or uplink synchronization (here including the TA). This solves the interference problem that may occur in the softsatellite switch scenario, thereby reducing the network scheduling complexity, as well as the network reception complexity and energy consumption.

[0013] Optionally, sending the first indication information to the base station includes any one of the following:

[0014] Upon obtaining the downlink timing of the target satellite, the first indication information is sent to the base station;

[0015] Upon obtaining the downlink timing and the timing advance (TA) of the target satellite, the first indication information is sent to the base station;

[0016] Upon obtaining the target satellite's TA, the first indication information is sent to the base station.

[0017] In this embodiment, the conditions under which the UE sends which indication, i.e., the conditions under which the UE sends the first indication information to the base station, can be implemented through at least three methods (or behaviors): Method 1: When the UE obtains the downlink timing of the target satellite, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained downlink synchronization of the target satellite, which here means obtaining the downlink timing of the target satellite; Method 2: When the UE obtains the downlink timing and the target satellite's TA, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained both downlink and uplink synchronization of the target satellite, which here means obtaining the downlink timing and the target satellite's TA; Method 3: When the UE obtains the target satellite's TA, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained uplink synchronization, which here means obtaining the target satellite's TA. Specifically, the first indication information can be sent to the base station in the form of RRC signaling, MAC CE, or UCI.

[0018] Optionally, sending the first indication information to the base station includes:

[0019] The first indication information is sent to the base station via the source satellite; or...

[0020] The first instruction information is sent to the base station via the target satellite.

[0021] In this embodiment, the UE can send the first indication information to the base station in at least two ways: Method 11: Send the first indication information to the base station according to the downlink timing and TA of the source satellite; specifically, send the first indication information to the base station according to the downlink timing and TA of the serving cell accessed by the source satellite. Method 12: Send the first indication information to the base station according to the downlink timing and TA of the target satellite; specifically, send the first indication information to the base station according to the downlink timing and TA of the serving cell accessed by the target satellite. Therefore, the UE can send the first indication information to the base station using any of the above methods.

[0022] Optionally, after sending the first indication information to the base station, the method further includes:

[0023] Receive second instruction information; wherein the second instruction information includes at least one of the following:

[0024] Indicates whether the UE applies the downlink timing of the target satellite;

[0025] Indicate whether the UE should perform a random access procedure;

[0026] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0027] Indicates whether the UE accesses the target satellite;

[0028] The specified time;

[0029] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0030] Specifically, the second instruction information can be sent to the UE via RRC signaling, MAC CE, or DCI.

[0031] Optionally, receiving the second indication information includes:

[0032] Receive the second indication information sent by the source satellite; or,

[0033] Receive the second instruction information sent by the target satellite.

[0034] In this embodiment of the application, the UE can receive the second indication information sent by the base station in at least two ways: Method 21, receiving the second indication information sent by the base station according to the downlink timing of the source satellite; Method 22, receiving the second indication information sent by the base station according to the downlink timing of the target satellite.

[0035] Optionally, before sending the first target indication information to the base station, the method further includes:

[0036] Receive the base station configuration information;

[0037] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0038] Optionally, the downlink timing of the target satellite can be applied in the following ways:

[0039] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or...

[0040] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform a random access procedure, the downlink timing of the target satellite is applied.

[0041] Optionally, the method of applying the downlink timing and TA of the target satellite includes any of the following:

[0042] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied.

[0043] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite.

[0044] The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

[0045] In this embodiment of the application, the downlink timing of the target satellite can be implemented in at least two ways: Method 31, after the UE sends an indication that it has obtained downlink synchronization through the target satellite to access the serving cell (here, the UE sends a first indication information for indicating that it has obtained downlink synchronization through the target satellite to access the serving cell), the UE performs the RACH procedure (i.e., random access procedure) using the downlink timing of the target satellite; Method 32, after the UE sends an indication that it has obtained downlink synchronization through the target satellite to access the serving cell and receives information from the base station instructing the UE to perform the RACH procedure using the downlink timing of the target satellite (here, the UE receives a second indication information from the base station instructing the UE to perform the random access procedure using the downlink timing of the target satellite), the UE performs the RACH procedure using the downlink timing of the target satellite.

[0046] The UE can apply the downlink timing and TA of the target satellite in at least three ways: Method 41: After the UE sends an indication that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell (here, the UE sends the first indication information indicating that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell), it applies the downlink timing and TA of the target satellite to perform uplink and downlink transmission; Method 42: After the UE sends an indication that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell, and receives information from the network base station instructing the UE to apply the timing and TA of the target satellite to perform uplink and downlink transmission (here, the UE receives the second indication information sent by the base station instructing the UE to apply the downlink timing and TA of the target satellite), it applies the downlink timing and TA of the target satellite to perform uplink and downlink transmission; Method 43: The UE starts applying the downlink timing and TA of the target satellite to perform uplink and downlink transmission at the time specified by the base station (here, the specified time indicated in the second indication information).

[0047] Optionally, the method may further include at least one of the following:

[0048] Trigger the random access procedure;

[0049] Apply the target satellite's TA;

[0050] Listen to the Physical Downlink Control Channel (PDCCH) of the target satellite;

[0051] Uplink and downlink transmissions are performed according to the downlink timing and TA of the target satellite;

[0052] Restart the timer advance timer TAT;

[0053] Read SIB1;

[0054] Read SIB19.

[0055] Optionally, the method further includes:

[0056] The system reports to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0057] In this embodiment, before sending the first indication information to the base station, the UE sends information to the base station indicating whether it supports the ability to obtain uplink synchronization with the target satellite without performing a random access procedure. Specifically, obtaining uplink synchronization without performing a random access procedure refers to the ability to obtain uplink synchronization with the target satellite without performing a random access procedure. This capability refers to the ability to obtain uplink synchronization without performing a random access procedure in an unchanged PCI scenario.

[0058] Optionally, before sending the first target indication information to the base station, the method further includes:

[0059] The transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or,

[0060] After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

[0061] In this embodiment of the application, before the UE sends the first indication information to the base station, the UE may send signals in at least two of the following ways: Method 51: At a preset time (e.g., t-start or a specified time), the UE stops sending SRS according to the source satellite's timing (here referring to downlink timing; the following timing refers to downlink timing, which will not be repeated below). After obtaining downlink synchronization with the target satellite (here referring to obtaining the target satellite's downlink timing), the UE sends SRS according to the target satellite's timing (here referring to obtaining the target satellite's downlink timing); (during this period, the UE uses the same set of SRS resources). Method 52: After obtaining downlink synchronization with the target satellite (here referring to obtaining the target satellite's downlink timing), the UE sends SRS resources configured for the target satellite according to the target satellite's timing (here referring to obtaining the target satellite's downlink timing), maintaining uplink and downlink transmission according to the source satellite's downlink timing; (a separate SRS resource is configured for the target satellite).

[0062] Optionally, the method of receiving the target satellite's TA before sending the first target indication information to the base station includes:

[0063] Receive the target satellite's TA (Transmission Address) from the source satellite; or,

[0064] Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

[0065] In this embodiment, the UE receives the TA (Telematics Message) of the target satellite in at least two ways: Method 61: The UE receives the TA of the target satellite sent by the base station according to the downlink timing of the source satellite; Method 62: The UE receives the TA of the target satellite sent by the base station according to the downlink timing of the target satellite. Specifically, the UE receives the TA value of the target satellite, such as MAC CE, through the source satellite; after applying the downlink timing of the target satellite, the UE listens for downlink transmissions on the target satellite and receives the TA value of the target satellite, such as the TA command sent by the target satellite.

[0066] Secondly, this application provides a method for timing using a target satellite, the method being executed by a base station, the method comprising:

[0067] The system receives a first indication message sent by the UE, which is used to instruct the UE to obtain synchronization with the target satellite.

[0068] Optionally, the first indication information includes any of the following:

[0069] Instruct the UE to obtain downlink synchronization from the target satellite;

[0070] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0071] Instruct the UE to obtain uplink synchronization from the target satellite.

[0072] In this embodiment, by receiving first indication information sent by the UE, the UE is instructed to obtain downlink synchronization and / or uplink synchronization of the target satellite. Specifically, obtaining downlink synchronization of the target satellite means obtaining the downlink timing of the target satellite, and obtaining uplink synchronization of the target satellite means obtaining the TA of the target satellite. Specifically, obtaining downlink timing of the target satellite means obtaining the downlink timing for transparent forwarding by the base station through the target satellite, and obtaining the TA of the target satellite means obtaining the TA for accessing the base station through the target satellite. In this way, the network knows when the UE has obtained downlink synchronization (here, obtaining the downlink timing of the target satellite) and / or uplink synchronization (here, including the TA). This solves the interference problem that may occur in the soft satellite switch scenario, thereby reducing the network scheduling complexity, as well as the network reception complexity and energy consumption.

[0073] Optionally, the method includes any of the following:

[0074] The first indication information is sent by the UE to the base station when it obtains the downlink timing of the target satellite;

[0075] The first indication information is sent by the UE to the base station when it obtains the downlink timing and TA of the target satellite;

[0076] The first indication information is sent by the UE to the base station when it obtains the TA of the target satellite.

[0077] In this embodiment of the application, the base station receives the first indication information sent by the UE, which can be achieved through at least three methods (or behaviors): Method 1: When the UE obtains the downlink timing of the target satellite, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 1, wherein the first indication information is used to indicate that the UE has obtained downlink synchronization of the target satellite, which means obtaining the downlink timing of the target satellite; Method 2: When the UE obtains the downlink timing and the target satellite's TA, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 2, wherein the first indication information is used to indicate that the UE has obtained both downlink synchronization and uplink synchronization of the target satellite, which means obtaining the downlink timing and the target satellite's TA; Method 3: When the UE obtains the target satellite's TA, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 3, wherein the first indication information is used to indicate that the UE has obtained uplink synchronization, which means obtaining the target satellite's TA.

[0078] Specifically, the first indication information can be sent to the base station via RRC signaling, MAC CE, or UCI.

[0079] Optionally, the first indication information sent by the receiving UE includes:

[0080] Receive the first indication information sent by the UE via the source satellite; or...

[0081] The first indication information sent by the UE is received by the target satellite.

[0082] In this embodiment, the base station can receive the first indication information sent by the UE in at least two ways: Method 11: Receive the first indication information sent by the UE according to the timing of the source satellite, specifically, receive the first indication information sent by the UE according to the timing of the serving cell accessed by the source satellite; Method 12: Receive the first indication information sent by the UE according to the timing of the target satellite, specifically, receive the first indication information sent by the UE according to the timing of the serving cell accessed by the target satellite. Therefore, the base station can receive the first indication information sent by the UE through any of the above methods.

[0083] Optionally, after receiving the first indication information sent by the UE, the method further includes:

[0084] Send a second indication message to the UE; wherein the second indication message includes at least one of the following:

[0085] Indicates whether the UE applies the downlink timing of the target satellite;

[0086] Indicate whether the UE should perform a random access procedure;

[0087] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0088] Indicates whether the UE accesses the target satellite;

[0089] The specified time;

[0090] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0091] Specifically, the second instruction information can be sent to the UE via RRC signaling, MAC CE, or DCI.

[0092] Optionally, sending the second indication information to the UE includes:

[0093] The second indication information is sent to the UE via the source satellite; or...

[0094] The second instruction information is sent to the UE via the target satellite.

[0095] In this embodiment of the application, the base station sends the second indication information to the UE in at least two ways: Method 21, the base station sends the second indication information to the UE according to the timing of the source satellite; Method 22, the base station sends the second indication information to the UE according to the timing of the target satellite.

[0096] Optionally, before receiving the first indication information sent by the UE, the method further includes:

[0097] Send configuration information to the UE;

[0098] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0099] Optionally, the method further includes:

[0100] Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0101] Specifically, obtaining uplink synchronization without performing a random access procedure refers to the ability to achieve uplink synchronization with a target satellite without performing a random access procedure. This capability refers to the ability to obtain uplink synchronization without performing a random access procedure in an unchanged PCI scenario.

[0102] Optionally, the method of sending the TA of the target satellite to the UE includes:

[0103] The target satellite's TA is transmitted to the UE via the source satellite; or...

[0104] The target satellite's TA is transmitted to the UE via the target satellite.

[0105] In this embodiment, the base station can send the target satellite's TA to the UE in at least two ways: Method 31, the base station sends the target satellite's TA to the UE according to the source satellite's timing; Method 32, the UE sends the target satellite's TA to the UE according to the target satellite's timing. Specifically, the TA value of the target satellite is sent through the source satellite, such as MAC CE; after the UE applies the downlink timing of the target satellite, it listens for downlink transmissions on the target satellite. The base station sends the target satellite's TA value through the target satellite, and the UE receives the target satellite's TA value through the target satellite, such as the TA command sent by the target satellite.

[0106] Thirdly, this application provides an apparatus for timing an application target satellite, the apparatus being executed by a UE, the apparatus comprising:

[0107] The transmitting unit is used to send first indication information to the base station, the first indication information being used to instruct the UE to obtain synchronization with the target satellite.

[0108] Fourthly, this application provides an apparatus for timing a target satellite, the apparatus being executed by a base station, the apparatus comprising:

[0109] The receiving unit is used to receive first indication information sent by the UE, the first indication information being used to instruct the UE to obtain synchronization with the target satellite.

[0110] Fifthly, this application provides an apparatus for timing a target satellite, the apparatus being executed by a UE, the apparatus including a memory, a transceiver, and a processor:

[0111] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0112] Send a first indication message to the base station, the first indication message being used to instruct the UE to obtain synchronization with the target satellite.

[0113] Optionally, the first indication information includes any of the following:

[0114] Instruct the UE to obtain downlink synchronization from the target satellite;

[0115] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0116] Instruct the UE to obtain uplink synchronization from the target satellite.

[0117] Optionally, the processor, when sending the first indication information to the base station, specifically includes any one of the following:

[0118] Upon obtaining the downlink timing of the target satellite, the first indication information is sent to the base station;

[0119] Upon obtaining the downlink timing and the timing advance (TA) of the target satellite, the first indication information is sent to the base station;

[0120] Upon obtaining the target satellite's TA, the first indication information is sent to the base station.

[0121] Optionally, the processor, when sending the first indication information to the base station, specifically includes any one of the following:

[0122] The first indication information is sent to the base station via the source satellite; or...

[0123] The first instruction information is sent to the base station via the target satellite.

[0124] Optionally, the processor is configured to perform the following operations after sending the first indication information to the base station:

[0125] Receive second instruction information; wherein the second instruction information includes at least one of the following:

[0126] Indicates whether the UE applies the downlink timing of the target satellite;

[0127] Indicate whether the UE should perform a random access procedure;

[0128] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0129] Indicates whether the UE accesses the target satellite;

[0130] The specified time;

[0131] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0132] Optionally, the processor is configured to perform the following operations before sending the first indication information to the base station:

[0133] Receive the base station configuration information;

[0134] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0135] Optionally, the processor, when applying downlink timing of the target satellite, specifically includes the following:

[0136] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or...

[0137] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform a random access procedure, the downlink timing of the target satellite is applied.

[0138] Optionally, the processor, when applying the downlink timing and TA of the target satellite, specifically includes any one of the following:

[0139] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied.

[0140] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite.

[0141] The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

[0142] Optionally, the processor is further configured to perform the following operations:

[0143] The system reports to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0144] Optionally, the processor is configured to perform the following operations before sending the first indication information to the base station:

[0145] The transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or,

[0146] After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

[0147] Optionally, the processor, when receiving the TA of the target satellite before sending the first indication information to the base station, specifically includes:

[0148] Receive the target satellite's TA (Transmission Address) from the source satellite; or,

[0149] Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

[0150] Sixthly, this application provides an apparatus for timing a target satellite, the apparatus being executed by a base station, the apparatus including a memory, a transceiver, and a processor:

[0151] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0152] The system receives a first indication message sent by the UE, which is used to instruct the UE to obtain synchronization with the target satellite.

[0153] Optionally, the first indication information includes any of the following:

[0154] Instruct the UE to obtain downlink synchronization from the target satellite;

[0155] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0156] Instruct the UE to obtain uplink synchronization from the target satellite.

[0157] Optionally, the first indication information is sent by the UE to the base station when it obtains the downlink timing of the target satellite; or,

[0158] The first indication information is sent by the UE to the base station when it obtains the downlink timing and TA of the target satellite; or,

[0159] The first indication information is sent by the UE to the base station when it obtains the TA of the target satellite.

[0160] Optionally, the processor is configured to perform the following operations after receiving the first indication information sent by the UE:

[0161] Send a second indication message to the UE; wherein the second indication message includes at least one of the following:

[0162] Indicates whether the UE applies the downlink timing of the target satellite;

[0163] Indicate whether the UE should perform a random access procedure;

[0164] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0165] Indicates whether the UE accesses the target satellite;

[0166] The specified time;

[0167] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0168] Optionally, the processor, when sending the second indication information to the UE, specifically includes:

[0169] The second indication information is sent to the UE via the source satellite; or...

[0170] The second instruction information is sent to the UE via the target satellite.

[0171] Optionally, the processor is configured to perform the following operations before receiving the first indication information sent by the UE:

[0172] Send configuration information to the UE;

[0173] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0174] Optionally, the processor is also configured to perform the following operations:

[0175] Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0176] Optionally, the processor, when sending the TA of the target satellite to the UE, specifically includes:

[0177] The target satellite's TA is transmitted to the UE via the source satellite; or...

[0178] The target satellite's TA is transmitted to the UE via the target satellite.

[0179] In a seventh aspect, this application provides a non-transitory readable storage medium storing a computer program for causing a processor to execute the method described in any of the preceding claims.

[0180] This application provides a method, apparatus, and readable storage medium for applying target satellite timing. The method involves sending a first indication message to a base station, whereby the first indication message instructs the UE to acquire synchronization with the target satellite. Specifically, by sending the first indication message to the base station, the UE is instructed to have acquired synchronization with the target satellite. This allows the network to clearly understand when the UE has acquired synchronization with the target satellite, effectively solving the problem that if the network does not know when the UE has acquired downlink and / or uplink synchronization, and the UE decides to perform uplink and downlink transmissions according to the target satellite's timing, it may cause interference to UEs performing uplink and downlink transmissions according to the source satellite's timing and TA. This further reduces the network's scheduling complexity.

[0181] It should be understood that the description in the foregoing summary section is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0182] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0183] Figure 1 A schematic diagram of an unchanged PCI scenario provided in an embodiment of this application;

[0184] Figure 2 An interactive schematic diagram of the method for timing target satellites provided in the embodiments of this application;

[0185] Figure 3 An interactive schematic diagram of a method for timing a target satellite provided in another embodiment of this application;

[0186] Figure 4 A schematic diagram of the structure of the device for timing the target satellite provided in the embodiments of this application;

[0187] Figure 5 This is a schematic diagram of the structure of a device for timing a target satellite provided in another embodiment of this application. Detailed Implementation

[0188] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0189] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0190] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0191] To clearly understand the technical solution of this application, the existing technical solutions will first be described in detail. In the 3GPPR17 / R18 study, the satellite acts as a transparent relay unit, connecting to the ground base station through a gateway station. The cell coverage provided by the satellite depends on the configuration of the base station. For quasi-earth fixed cells, through network architecture design and deployment, it is possible to achieve the effect that changes in the satellite coverage area do not affect the cell coverage itself; that is, the PCI and frequency of the cells serving that area do not change. Figure 1 As shown, at time T1, gNB1 provides service to area A through sat1 (referring to satellite 1, i.e., the source satellite). At time T2, gNB1 continues to provide service to area A through sat2 (referring to satellite 1, i.e., the target satellite). gNB1 can be designed to implement the PCI and frequency point (i.e., ...) of the cell serving area A when switching from sat1 to sat2. Figure 1 The F1 (cell configuration) and UE configuration remain unchanged. From the UE's perspective, the cell has not changed, and there is no need for handover, conditional handover, or cell reselection.

[0192] In unchanged PCI scenarios, there is a situation called a soft satellite switch, where satellite 2 starts providing coverage before satellite 1 stops service, and satellite 1 and satellite 2 share a common coverage area A for a period of time. The time when satellite 1 stops service is t-service, and the time when satellite 2 starts service is t-start. <t-service。

[0193] In soft satellite switch scenarios, between t-start and t-service, both the source and target satellites provide services to the UE simultaneously. During this period, the UE performs a synchronization process with the target satellite. However, whether the UE can immediately apply the downlink timing and / or timing advance (TA) after obtaining the target satellite's downlink timing requires further discussion. Analysis suggests that immediate application presents the following problems: the timing at which each UE obtains synchronization with the target satellite is not consistent. For example, if a UE immediately sends a preamble according to the target satellite's timing after completing downlink synchronization; or, if the UE immediately performs uplink and downlink transmissions according to the target satellite's timing and TA after completing downlink synchronization and obtaining TA without RACH, the network (referring to the base station) is unaware of when the UE obtained downlink and / or uplink synchronization. If the UE decides to perform uplink and downlink transmissions according to the target satellite's timing, it may interfere with UEs performing uplink and downlink transmissions according to the source satellite's timing and TA, thereby increasing network scheduling complexity.

[0194] Therefore, existing technologies cannot effectively solve the interference problems that may occur in the soft satellite switch scenario, thereby increasing the scheduling complexity of the base station.

[0195] Further research by the inventors revealed that, in order to solve the interference problem that may occur in the soft satellite switch scenario and thus reduce the scheduling complexity of the base station, after the UE obtains downlink synchronization and / or uplink synchronization of the target satellite, it can report indication information (here referring to the first indication information) to the network. In this way, the network knows when the UE has obtained downlink synchronization and / or uplink synchronization.

[0196] Therefore, based on the inventors' inventive research, the method and apparatus for timing with the target satellite proposed in this application are proposed. In this application, by sending a first indication information to the base station, the UE is instructed to obtain synchronization with the target satellite. In this way, the network knows when the UE has obtained downlink synchronization and / or uplink synchronization, which solves the interference problem that may occur in the soft satellite switch scenario, thereby reducing the scheduling complexity of the network, as well as reducing the receiving complexity and energy consumption of the network.

[0197] The method and apparatus are based on the same concept of the application. Since the methods and apparatus solve problems in similar ways, the implementation of the apparatus and methods can refer to each other, and the repeated parts will not be described again.

[0198] The embodiments of this application will now be described with reference to the accompanying drawings.

[0199] It should be noted that, based on the method by which the UE obtains uplink synchronization, there are two schemes: RACH-based (i.e., performing a random access procedure) and without RACH (i.e., not performing a random access procedure). RACH-based means that after the UE obtains downlink synchronization from the target satellite, it applies the target satellite's timings to perform the RACH procedure to obtain the TA. Without RACH means that after the UE obtains downlink synchronization from the target satellite, it calculates the target satellite's TA itself based on auxiliary parameters configured by the network. The following will elaborate on these two methods respectively.

[0200] In this application, after the UE obtains downlink synchronization and / or uplink / downlink synchronization of the target satellite, it sends first indication information to the base station.

[0201] Optionally, the base station may, based on the first indication information sent by the UE, instruct the UE whether to apply the downlink timing and / or TA of the target satellite, or instruct the UE whether to perform data transmission in the target cell.

[0202] Specifically, in the RACH-based scenario, after completing downlink synchronization, the UE reports a first indication to the base station based on the timing of the source satellite. Optionally, one approach is that after receiving the first indication from the UE, the base station determines whether the UE can perform uplink and downlink transmissions according to the target satellite's timing (e.g., perform a RACH procedure) based on interference and other factors. If the UE receives a second indication from the base station instructing it to perform a random access procedure, the UE performs the RACH procedure according to the target satellite's timing, obtains a TA, and can then begin using the target satellite's timing and TA. Alternatively, the UE can begin using the target satellite's timing and TA after receiving the second indication from the network (instructing the UE to access the target satellite), or, after obtaining the TA, begin using it at a specified time (e.g., t-service). Another approach is that after sending the indication, the UE triggers RACH using the target satellite's timing, obtains a TA, and can then begin using the target satellite's timing and TA. Alternatively, after obtaining the TA, the UE can begin using it at a specified time (which could be an agreed-upon time or a time pre-configured by the network) (e.g., t-service).

[0203] In the case of without RACH, after the UE completes downlink synchronization and calculates the target satellite's timing (TA) based on the auxiliary information configured by the base station, the UE reports the timing to the base station based on the source satellite's timing. Upon receiving the UE's report, the base station determines whether the UE can use the target satellite's timing and TA for uplink and downlink transmission based on factors such as interference. If the UE receives a network confirmation message, it can begin using the target satellite's timing and TA from that point, or start using them at a specified time (e.g., t-service). Alternatively, the UE can use the target satellite's timing and TA after sending the auxiliary information without waiting for network confirmation.

[0204] In the case of without RACH, after the UE completes downlink synchronization and calculates the TA of the target satellite based on the auxiliary information configured by the base station, the UE reports to the target satellite. This refers to reporting to the base station using the timing and TA of the target satellite. Optionally, after receiving the UE's report information and determining that the UE has accessed the target satellite, the base station stops scheduling the UE on the source satellite and begins scheduling the UE through the target satellite. Optionally, the target satellite sends back confirmation information to the UE. The UE can perform data transmission on the target satellite after reporting the indication information, or it can perform data transmission on the target satellite after receiving confirmation information from the network side (e.g., the base station). Specifically, the indication information can be the Radio Network Temporary Identifier (C-RNTI) or the UE's SAE Temporary Mobile Station Identifier (S-TMSI).

[0205] The following section provides a detailed explanation of the method for applying target satellite timing during the period from the start of service by the target satellite to the end of service by the source satellite, specifically for soft satellite conversion scenarios.

[0206] This application provides a method for applying target satellite timing, wherein the execution subject of the method is a terminal UE; the method for applying target satellite timing provided in this application includes the following steps:

[0207] Send a first indication message to the base station, the first indication message being used to instruct the UE to obtain synchronization with the target satellite.

[0208] The UE indicates to the base station that it has achieved synchronization with the target satellite by sending a first indication message.

[0209] Optionally, the first indication information includes any of the following:

[0210] Instruct the UE to obtain downlink synchronization from the target satellite;

[0211] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0212] Instruct the UE to obtain uplink synchronization from the target satellite.

[0213] In this embodiment, by sending a first indication message to the base station, the UE is instructed to obtain downlink synchronization and / or uplink synchronization of the target satellite. Specifically, obtaining downlink synchronization of the target satellite means obtaining the downlink timing of the target satellite, and obtaining uplink synchronization of the target satellite means obtaining the TA of the target satellite. Specifically, obtaining the downlink timing of the target satellite means obtaining the downlink timing for transparent forwarding by the base station through the target satellite, and obtaining the TA of the target satellite means obtaining the TA for accessing the base station through the target satellite. In this way, the network (here referring to the base station, which will not be elaborated further below) knows when the UE has obtained downlink synchronization (here referring to obtaining the downlink timing of the target satellite) and / or uplink synchronization (here including the TA). This solves the interference problem that may occur in the softsatellite switch scenario, thereby reducing the network scheduling complexity, as well as the network reception complexity and energy consumption.

[0214] Optionally, sending the first indication information to the base station includes any one of the following:

[0215] Upon obtaining the downlink timing of the target satellite, the first indication information is sent to the base station;

[0216] Upon obtaining the downlink timing and the timing advance (TA) of the target satellite, the first indication information is sent to the base station;

[0217] Upon obtaining the target satellite's TA, the first indication information is sent to the base station.

[0218] In this embodiment of the application, the conditions under which the UE sends which indication, i.e., the conditions under which the UE sends the first indication information to the base station, can be implemented through at least three methods (or behaviors): Method 1: When the UE obtains the downlink timing of the target satellite, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained the downlink synchronization of the target satellite, which here means that the downlink timing of the target satellite has been obtained; Method 2: When the UE obtains the downlink timing and the target satellite's TA, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained both the downlink synchronization and uplink synchronization of the target satellite, which here means that the downlink timing and the target satellite's TA have been obtained; Method 3: When the UE obtains the target satellite's TA, it sends the first indication information to the base station, wherein the first indication information is used to indicate that the UE has obtained uplink synchronization, which here means that the target satellite's TA has been obtained.

[0219] Specifically, the first indication information can be sent to the base station via RRC signaling, MAC CE, or UCI.

[0220] Optionally, sending the first indication information to the base station includes:

[0221] The first indication information is sent to the base station via the source satellite; or...

[0222] The first instruction information is sent to the base station via the target satellite.

[0223] In this embodiment, the UE can send the first indication information to the base station in at least two ways: Method 11: Send the first indication information to the base station according to the downlink timing and TA of the source satellite; specifically, send the first indication information to the base station according to the downlink timing and TA of the serving cell accessed by the source satellite. Method 12: Send the first indication information to the base station according to the downlink timing and TA of the target satellite; specifically, send the first indication information to the base station according to the downlink timing and TA of the serving cell accessed by the target satellite. Therefore, the UE can send the first indication information to the base station using any of the above methods.

[0224] Optionally, after sending the first indication information to the base station, the method further includes:

[0225] Receive second instruction information; wherein the second instruction information includes at least one of the following:

[0226] Indicates whether the UE applies the downlink timing of the target satellite;

[0227] Indicate whether the UE should perform a random access procedure;

[0228] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0229] Indicates whether the UE accesses the target satellite;

[0230] The specified time;

[0231] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0232] In this embodiment of the application, after the UE sends the first indication information to the base station, it receives the second indication information. Specifically, the UE receives the second indication information sent by the base station. The second indication information is used to indicate whether the UE applies the downlink timing of the target satellite, whether the UE performs a random access procedure, whether the UE applies the TA of the target satellite for uplink transmission, whether the UE accesses the target satellite, and at least one of the following: the specified time includes the time when the UE performs the random access procedure, the time when the UE applies the downlink timing of the target satellite, and the time when the UE applies the TA of the target satellite.

[0233] Specifically, the second instruction information can be sent to the UE via RRC signaling, MAC CE, or DCI.

[0234] Optionally, receiving the second indication information includes:

[0235] Receive the second indication information sent by the source satellite; or,

[0236] Receive the second instruction information sent by the target satellite.

[0237] In this embodiment of the application, the UE can receive the second indication information sent by the base station in at least two ways: Method 21, receiving the second indication information sent by the base station according to the downlink timing of the source satellite; Method 22, receiving the second indication information sent by the base station according to the downlink timing of the target satellite.

[0238] Optionally, before sending the first target indication information to the base station, the method further includes:

[0239] Receive the base station configuration information;

[0240] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0241] In this embodiment of the application, the UE receives information configured by the base station. This configuration information is used to instruct the UE to obtain uplink synchronization indication information of the target satellite, to instruct the UE to apply downlink timing of the target satellite, to instruct the UE to apply downlink timing and TA of the target satellite, to instruct the UE to use preamble resources dedicated to the target satellite, to instruct the uplink reference signal resources dedicated to the source satellite, to instruct the uplink reference signal resources dedicated to the target satellite, and to instruct the UE whether to report the first indication information.

[0242] Among them, the instruction information for instructing the UE to obtain uplink synchronization of the target satellite is used to instruct the UE to obtain uplink synchronization of the target satellite by performing a random access procedure, instruct the UE to calculate and obtain TA (calculate TA based on the propagation delay difference between the source satellite and the target satellite), instruct the UE to obtain TA by random access, or instruct the UE to obtain TA by sending SRS.

[0243] Specifically, the base station configuration information can be sent to the UE via dedicated signaling (such as RRC reconfiguration messages) or via broadcast to the UE.

[0244] Optionally, the downlink timing of the target satellite can be applied in the following ways:

[0245] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or...

[0246] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform RACH, the downlink timing of the target satellite is applied.

[0247] Optionally, the method of applying the downlink timing and TA of the target satellite includes any of the following:

[0248] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied.

[0249] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite.

[0250] The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

[0251] In this embodiment of the application, the downlink timing of the target satellite can be implemented in at least two ways: Method 31, after the UE sends an indication that it has obtained downlink synchronization through the target satellite to access the serving cell (here, the UE sends a first indication information for indicating that it has obtained downlink synchronization through the target satellite to access the serving cell), the UE performs the RACH procedure (i.e., random access procedure) using the downlink timing of the target satellite; Method 32, after the UE sends an indication that it has obtained downlink synchronization through the target satellite to access the serving cell and receives information from the base station instructing the UE to perform the RACH procedure using the downlink timing of the target satellite (here, the UE receives a second indication information from the base station instructing the UE to perform the random access procedure using the downlink timing of the target satellite), the UE performs the RACH procedure using the downlink timing of the target satellite.

[0252] The UE can apply the downlink timing and TA of the target satellite in at least three ways: Method 41: After the UE sends an indication that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell (here, the UE sends the first indication information indicating that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell), it applies the downlink timing and TA of the target satellite to perform uplink and downlink transmission; Method 42: After the UE sends an indication that it has obtained downlink synchronization and uplink synchronization through the target satellite to access the serving cell, and receives information from the network base station instructing the UE to apply the timing and TA of the target satellite to perform uplink and downlink transmission (here, the UE receives the second indication information sent by the base station instructing the UE to apply the downlink timing and TA of the target satellite), it applies the downlink timing and TA of the target satellite to perform uplink and downlink transmission; Method 43: The UE starts applying the downlink timing and TA of the target satellite to perform uplink and downlink transmission at the time specified by the base station (here, the specified time indicated in the second indication information).

[0253] Optionally, the method may further include at least one of the following:

[0254] Trigger the random access procedure;

[0255] Apply the target satellite's TA;

[0256] Listen to the Physical Downlink Control Channel (PDCCH) of the target satellite;

[0257] Uplink and downlink transmissions are performed according to the downlink timing and TA of the target satellite;

[0258] Restart the timer advance timer TAT;

[0259] Read SIB1;

[0260] Read SIB19.

[0261] In this embodiment, before or after the UE applies the downlink timing of the target satellite or the downlink timing and TA of the target satellite, the UE may also perform at least one of the following operations: triggering a random access procedure, applying the TA of the target satellite, listening to the physical downlink control channel (PDCCH) of the target satellite, performing uplink and downlink transmission according to the downlink timing and TA of the target satellite, restarting the timing advance timer (TAT), reading SIB1, and reading SIB19 (to obtain the ephemeris of the target satellite, common TA, and other configurations). It should be noted that the specific order of execution of the above operations is not limited.

[0262] Optionally, the method further includes:

[0263] The UE reports to the base station whether it supports obtaining uplink synchronization without performing a random access procedure. In this embodiment, before sending the first indication information to the base station, the UE reports to the base station whether it supports obtaining uplink synchronization with the target satellite without performing a random access procedure.

[0264] Specifically, obtaining uplink synchronization without performing a random access procedure refers to the ability to achieve uplink synchronization with a target satellite without performing a random access procedure. This capability refers to the ability to obtain uplink synchronization without performing a random access procedure in an unchanged PCI scenario.

[0265] Optionally, before sending the first target indication information to the base station, the method further includes:

[0266] The transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or,

[0267] After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

[0268] In this embodiment of the application, before the UE sends the first indication information to the base station, the UE may send signals in at least two of the following ways: Method 51: At a preset time (e.g., t-start or a specified time), the UE stops sending SRS according to the source satellite's timing (here referring to downlink timing). After obtaining downlink synchronization with the target satellite (here referring to obtaining the target satellite's downlink timing), the UE sends SRS according to the target satellite's timing (here referring to obtaining the target satellite's downlink timing); (during this period, the UE uses the same set of SRS resources). Method 52: After obtaining downlink synchronization with the target satellite (here referring to obtaining the target satellite's downlink timing), the UE sends SRS resources configured for the target satellite according to the target satellite's timing (here referring to obtaining the target satellite's downlink timing), maintaining uplink and downlink transmission according to the source satellite's downlink timing; (a separate SRS resource is configured for the target satellite).

[0269] It should be noted that timing refers to downlink timing, which will not be elaborated further below.

[0270] Optionally, the method of receiving the target satellite's TA before sending the first target indication information to the base station includes:

[0271] Receive the target satellite's TA (Transmission Address) from the source satellite; or,

[0272] Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

[0273] In this embodiment, the UE receives the TA (Telematics Message) of the target satellite in at least two ways: Method 61: The UE receives the TA of the target satellite sent by the base station according to the downlink timing of the source satellite; Method 62: The UE receives the TA of the target satellite sent by the base station according to the downlink timing of the target satellite. Specifically, the UE receives the TA value of the target satellite, such as MAC CE, through the source satellite; after applying the downlink timing of the target satellite, the UE listens for downlink transmissions on the target satellite and receives the TA value of the target satellite, such as the TA command sent by the target satellite.

[0274] Therefore, the embodiments of this application solve the interference problem that may occur in the soft satellite switch scenario, and reduce the network reception complexity and energy consumption.

[0275] Another embodiment of this application provides a method for timing with a target satellite. The method for timing with a target satellite is executed by a base station and may include the following steps:

[0276] The system receives a first indication message sent by the UE, which is used to instruct the UE to obtain synchronization with the target satellite.

[0277] The base station instructs the UE to achieve synchronization with the target satellite by receiving the first indication information sent by the UE. This allows the network to determine when the UE achieved synchronization (referring to downlink and / or uplink synchronization), eliminating the need for the network to monitor the uplink data sent by the UE according to the time intervals of the source and target satellites starting from t-start (the time when the target satellite begins service). This reduces network monitoring complexity and energy consumption. Simultaneously, it resolves potential interference issues in soft satellite switching scenarios, further reducing network scheduling complexity.

[0278] Optionally, the first indication information includes any of the following:

[0279] Instruct the UE to obtain downlink synchronization from the target satellite;

[0280] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0281] Instruct the UE to obtain uplink synchronization from the target satellite.

[0282] In this embodiment, by receiving first indication information sent by the UE, the UE is instructed to obtain downlink synchronization and / or uplink synchronization of the target satellite. Specifically, obtaining downlink synchronization of the target satellite means obtaining the downlink timing of the target satellite, and obtaining uplink synchronization of the target satellite means obtaining the TA of the target satellite. Specifically, obtaining the downlink timing of the target satellite means obtaining the downlink timing for transparent forwarding by the base station through the target satellite, and obtaining the TA of the target satellite means obtaining the TA for accessing the base station through the target satellite. In this way, the network knows when the UE has obtained downlink synchronization (including downlink timing) and / or uplink synchronization (including downlink timing of the target satellite) and / or uplink synchronization (including TA). This solves the interference problem that may occur in the soft satellite switch scenario, thereby reducing the network scheduling complexity, as well as the network reception complexity and energy consumption.

[0283] Optionally, the method includes any of the following:

[0284] The first indication information is sent by the UE to the base station when it obtains the downlink timing of the target satellite;

[0285] The first indication information is sent by the UE to the base station when it obtains the downlink timing and TA of the target satellite;

[0286] The first indication information is sent by the UE to the base station when it obtains the TA of the target satellite.

[0287] In this embodiment of the application, the base station receives the first indication information sent by the UE, which can be achieved through at least three methods (or behaviors): Method 1: When the UE obtains the downlink timing of the target satellite, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 1, wherein the first indication information is used to indicate that the UE has obtained downlink synchronization of the target satellite, which means obtaining the downlink timing of the target satellite; Method 2: When the UE obtains the downlink timing and the target satellite's TA, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 2, wherein the first indication information is used to indicate that the UE has obtained both downlink synchronization and uplink synchronization of the target satellite, which means obtaining the downlink timing and the target satellite's TA; Method 3: When the UE obtains the target satellite's TA, it sends the first indication information to the base station, and the base station receives the first indication information sent by the UE in this method 3, wherein the first indication information is used to indicate that the UE has obtained uplink synchronization, which means obtaining the target satellite's TA.

[0288] Specifically, the first indication information can be sent to the base station via RRC signaling, MAC CE, or UCI.

[0289] Optionally, the first indication information sent by the receiving UE includes:

[0290] Receive the first indication information sent by the UE via the source satellite; or...

[0291] The first indication information sent by the UE is received by the target satellite.

[0292] In this embodiment, the base station can receive the first indication information sent by the UE in at least two ways: Method 11: Receive the first indication information sent by the UE according to the timing of the source satellite, specifically, receive the first indication information sent by the UE according to the timing of the serving cell accessed by the source satellite; Method 12: Receive the first indication information sent by the UE according to the timing of the target satellite, specifically, receive the first indication information sent by the UE according to the timing of the serving cell accessed by the target satellite. Therefore, the base station can receive the first indication information sent by the UE through any of the above methods.

[0293] Optionally, after receiving the first indication information sent by the UE, the method further includes:

[0294] Send a second indication message to the UE; wherein the second indication message includes at least one of the following:

[0295] Indicates whether the UE applies the downlink timing of the target satellite;

[0296] Indicate whether the UE should perform a random access procedure;

[0297] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0298] Indicates whether the UE accesses the target satellite;

[0299] The specified time;

[0300] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0301] In this embodiment, after receiving the first indication information sent by the UE, the base station sends a second indication information to the UE. This second indication information is used to indicate whether the UE applies the downlink timing of the target satellite, whether the UE performs a random access procedure, whether the UE applies the target satellite's TA for uplink transmission, whether the UE accesses the target satellite, and at least one of the following: the specified time includes the time when the UE performs the random access procedure, the time when the UE applies the target satellite's downlink timing, and the time when the UE applies the target satellite's TA. Specifically, the second indication information can be sent to the UE via RRC signaling, MAC CE, or DCI.

[0302] Optionally, sending the second indication information to the UE includes:

[0303] The second indication information is sent to the UE via the source satellite; or...

[0304] The second instruction information is sent to the UE via the target satellite.

[0305] In this embodiment of the application, the base station sends the second indication information to the UE in at least two ways: Method 21, the base station sends the second indication information to the UE according to the timing of the source satellite; Method 22, the base station sends the second indication information to the UE according to the timing of the target satellite.

[0306] Optionally, before receiving the first indication information sent by the UE, the method further includes:

[0307] Send configuration information to the UE;

[0308] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0309] In this embodiment of the application, the base station sends configuration information to the UE. This configuration information is used to instruct the UE to obtain uplink synchronization indication information of the target satellite, instruct the UE to apply downlink timing of the target satellite at a certain time, instruct the UE to apply downlink timing and TA of the target satellite at a certain time, instruct the UE to use preamble resources dedicated to the target satellite, instruct the UE to use uplink reference signal resources dedicated to the source satellite, instruct the UE to use uplink reference signal resources dedicated to the target satellite, and instruct the UE to report the first indication information. Among them, the indication information instructing the UE to obtain uplink synchronization of the target satellite includes any one of instructing the UE to obtain uplink synchronization of the target satellite by performing a random access procedure, instructing the UE to calculate and obtain the TA by itself (calculating the TA based on the propagation delay difference between the source satellite and the target satellite), instructing the UE to obtain the TA by random access, and instructing the UE to obtain the TA by sending SRS.

[0310] Specifically, the base station configuration information can be sent to the UE via dedicated signaling (such as RRC reconfiguration messages) or via broadcast to the UE.

[0311] Optionally, the method further includes:

[0312] Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0313] In this embodiment of the application, before receiving the first indication information sent by the UE, the base station receives a report from the UE indicating whether it supports the ability to obtain uplink synchronization with the target satellite without performing a random access procedure. Specifically, obtaining uplink synchronization without performing a random access procedure refers to the ability to obtain uplink synchronization with the target satellite without performing a random access procedure. This capability refers to the ability to obtain uplink synchronization without performing a random access procedure in an unchanged PCI scenario.

[0314] Optionally, the method of sending the TA of the target satellite to the UE includes:

[0315] The target satellite's TA is transmitted to the UE via the source satellite; or...

[0316] The target satellite's TA is transmitted to the UE via the target satellite.

[0317] In this embodiment, the base station can send the target satellite's TA to the UE in at least two ways: Method 31, the base station sends the target satellite's TA to the UE according to the source satellite's timing; Method 32, the UE sends the target satellite's TA to the UE according to the target satellite's timing. Specifically, the TA value of the target satellite is sent through the source satellite, such as MAC CE; after the UE applies the downlink timing of the target satellite, it listens for downlink transmissions on the target satellite. The base station sends the target satellite's TA value through the target satellite, and the UE receives the target satellite's TA value through the target satellite, such as the TA command sent by the target satellite.

[0318] Therefore, the embodiments of this application solve the interference problem that may occur in the soft satellite switch scenario, and reduce the network reception complexity and energy consumption.

[0319] The following detailed description of the method for timing the target satellite is provided through specific embodiments.

[0320] Example 1 (overall flow of the method for applying target satellite timing in a scenario where random access is performed via RACH)

[0321] See Figure 2 As shown, Figure 2 This is an interactive schematic diagram illustrating the method for timing an application target satellite provided in this embodiment. The method for timing an application target satellite provided in this embodiment includes the following steps:

[0322] Step 0. Network (referring to the base station, i.e., gNB, which will not be elaborated further below) configuration information (the information configured here includes at least one of the following: indication information for the UE to obtain uplink synchronization of the target satellite, indication time for the UE to apply downlink timing of the target satellite, indication time for the UE to apply downlink timing and TA of the target satellite, preamble resources dedicated to the target satellite, uplink reference signal resources dedicated to the source satellite, uplink reference signal resources dedicated to the target satellite, and indication for the UE to report the first indication information). This configured information can be sent to the UE through system information broadcast (e.g., broadcast in SIB19) or through dedicated signaling.

[0323] Step 1. The UE obtains downlink synchronization by reading the SSB sent by the target satellite, that is, it obtains the downlink timing of the target satellite, but it is not used at this time.

[0324] Step 2. The UE, according to the downlink timing and TA reporting indication information (here referring to the first indication information) of the source satellite, instructs the network that the UE has obtained downlink synchronization to the serving cell through the target satellite.

[0325] Alternatively, if in step 0, the network configures the UE to report the synchronization indication information of the target satellite (i.e., the information in the network configuration of the UE includes an indication of whether the UE should report the first indication information), then the UE executes step 2; otherwise, step 2 is not executed.

[0326] Step 3 (optionally). The UE receives indication information from the network (here referring to the second indication information). This process is performed according to the timing of the source satellite. The indication information is used to indicate whether the UE allows the RACH process to be performed according to the timing of the target satellite. For example, the network indicates that the UE can use the timing of the target satellite to send uplink signals.

[0327] Step 4. If step 3 is present (i.e., if step 3 is executed), the UE will apply the target satellite's timed RACH procedure after receiving the network's instruction information; otherwise, the UE can apply the target satellite's timed RACH procedure after obtaining downlink synchronization through the uplink reporting in step 2. Through this step, the UE obtains the target satellite's TA.

[0328] Step 5 (optionally). The UE receives indication information from the network (here referring to the second indication information), which instructs the UE to begin applying the downlink timing and TA of the target satellite.

[0329] Step 6. If step 5 is performed, the UE begins applying the downlink timing and TA of the target satellite after receiving the network's instruction information. Otherwise, the UE begins applying the downlink timing and TA of the target satellite immediately after obtaining the TA of the target satellite. Alternatively, it may begin applying the downlink timing and TA of the target satellite at a specified time (e.g., when the source satellite ceases service t-service).

[0330] Among them, the UE application of the target satellite's downlink timing and TA means that the UE performs uplink and downlink transmission and measurement according to the target satellite's downlink timing and TA; in addition, when the UE starts to apply the target satellite's downlink timing and TA, it no longer maintains the source satellite's downlink timing and TA.

[0331] In addition, steps 3 and 4 above can be: Step 3 (optionally). The UE receives indication information from the network. This process is performed according to the timing of the source satellite. The indication information is used to indicate whether the UE is allowed to send uplink reference signals, such as sounding reference signals (SRS), according to the timing of the target satellite.

[0332] This allows configuring two sets of SRS resources for the UE: one set transmitted according to the source satellite's timing, and the other according to the target satellite's timing. Step 3 specifies whether to allow the transmission of the latter set of SRS resources according to the target satellite's timing; or...

[0333] The system is configured to stop transmitting SRS according to the source satellite's timing after the target satellite begins providing service. After obtaining downlink synchronization, the terminal transmits SRS according to the target satellite's timing. Step 3 indicates whether to allow the transmission of this SRS resource according to the target satellite's timing.

[0334] Step 4. If step 3 is performed (i.e., if step 3 is executed), the UE, after receiving the network's indication information, will use the target satellite's timed SRS transmission; otherwise, the UE can use the target satellite's timed SRS transmission after obtaining downlink synchronization through the reporting in step 2. Through this step, the UE obtains the target satellite's TA.

[0335] Example 2 (overall flow of the method for applying target satellite timing in a scenario without RACH, i.e., without performing a random access procedure)

[0336] See Figure 3 As shown, Figure 3 This is an interactive schematic diagram illustrating a method for timing an application target satellite according to another embodiment of this application. The method for timing an application target satellite provided in this embodiment includes the following steps:

[0337] Step 0. Network configuration information (the information configured here includes at least one of the following: indication information for the UE to obtain uplink synchronization of the target satellite, indication time for the UE to apply downlink timing of the target satellite, indication time for the UE to apply downlink timing and TA of the target satellite, preamble resources dedicated to the target satellite, uplink reference signal resources dedicated to the source satellite, uplink reference signal resources dedicated to the target satellite, and indication for the UE to report the first indication information). This configured information can be sent to the UE via system information broadcast (e.g., broadcast in SIB19) or via dedicated signaling.

[0338] Step 1. The UE obtains downlink synchronization by reading the SSB transmitted by the target satellite, i.e., it obtains the target satellite's timing. Based on the UE's location, the source satellite's ephemeris, the target satellite's ephemeris, and one or more of the network-configured N_TA, the UE calculates the target satellite's TA. At this point, the UE does not apply the target satellite's downlink timing and TA.

[0339] Step 2. The UE, according to the downlink timing and TA reporting indication information (here referring to the first indication information) of the source satellite, instructs the network to obtain downlink synchronization and uplink synchronization for connecting to the serving cell via the target satellite. Specifically, this indication information can be indicated by 1 bit.

[0340] Optionally, if in step 0, the network configures the UE to report the synchronization indication information of the target satellite, then the UE executes step 2; otherwise, step 2 is not executed.

[0341] Alternatively, the UE may instruct the network, based on the downlink timing and TA reporting indication information from the target satellite, that it has obtained downlink and uplink synchronization for connecting to the serving cell via the target satellite. This indication information may include the UE's C-RNTI, S-TMSI, demodulation reference signal (DMRS), SRS, or preamble information. This is an implicit form of indication; if the target satellite receives this indication information, it is considered that the terminal (UE) has obtained uplink synchronization with the target satellite.

[0342] Step 3 (optionally). The UE receives indication information from the network (here referring to the second indication information), which instructs the UE to begin applying the downlink timing and TA of the target satellite.

[0343] Step 4 (optional). If step 3 is present (i.e., if step 3 is executed), the UE begins applying the downlink timing and TA of the target satellite after receiving the network's instruction information; otherwise, the UE begins applying the downlink timing and TA of the target satellite immediately after obtaining the TA of the target satellite. Alternatively, the UE begins applying the downlink timing and TA of the target satellite when the source satellite ceases service (or at a specified time). Furthermore, the UE no longer maintains the downlink timing and TA of the source satellite when it begins applying the downlink timing and TA of the target satellite.

[0344] For example, Embodiment 3 (based on Embodiments 1 and 2, further refining the process of UE reporting indication information (here referring to the first indication information) and network instructing UE to apply downlink synchronization or downlink synchronization and uplink synchronization of the target satellite)

[0345] The method for timing target satellites provided in this embodiment includes the following steps:

[0346] Step 1. The terminal (UE) sends an indication to the network that it has obtained downlink synchronization or uplink synchronization (i.e., downlink synchronization and uplink synchronization) through the target satellite access serving cell. (This refers to the UE sending the first indication information to the base station that it has obtained downlink synchronization through the target satellite access serving cell or the UE sending the first indication information to the base station that it has obtained both downlink synchronization and uplink synchronization through the target satellite access serving cell.)

[0347] This instruction can be reported to the network via RRC messages, MAC CE, or UCI.

[0348] The terminal can send this instruction according to the downlink timing and TA of the source satellite. Alternatively, in the withoutRACH mode, the terminal can also send it to the network according to the downlink timing and TA of the acquired target satellite.

[0349] The specific implementation of this indication information (referring to the first indication information) can be as follows: Option 1 indicates to the UE that downlink synchronization or uplink / downlink synchronization has been completed using one indication information (e.g., one bit); Option 2 indicates to the UE that downlink synchronization or uplink / downlink synchronization has been completed using two indication information pieces (e.g., two bits each). Specifically:

[0350] Option 1: Before step 1, the UE reports whether it supports the ability to obtain uplink synchronization with the target satellite via without RACH. If the UE supports the without RACH method, then the UE should default to obtaining uplink synchronization with the target satellite via without RACH. If a UE that supports this capability reports this indication information, the network considers that the UE has completed downlink and uplink synchronization with the target satellite. Otherwise, the network considers that the UE has completed downlink synchronization with the target satellite.

[0351] Option 2: The UE reports indication information 1, indicating that the network considers the UE to have completed downlink and uplink synchronization with the target satellite. The UE reports indication information 2, indicating that the network considers the UE to have completed downlink synchronization with the target satellite. Indication information 1 and indication information 2 are two different first indication messages in Option 2.

[0352] Step 2. The terminal receives an indication from the network indicating whether the target satellite can be used to send uplink and downlink messages at regular intervals (this refers to the second indication information).

[0353] The network can provide information (referring to the second indication information) to the UE in the following ways:

[0354] Specialized signaling, such as RRC messages, MAC CE, or DCI;

[0355] In the form of broadcasting, for example, the network will broadcast an instruction message to all terminals that have completed step 1;

[0356] The terminal may receive the instruction (here referring to the second instruction information) according to the timing of the source satellite. Alternatively, if in step 1 the terminal receives the uplink information (here referring to the first instruction information) sent according to the downlink timing of the target satellite and the TA, then in step 2 the terminal may also receive the instruction (here referring to the second instruction information) according to the timing of the target satellite.

[0357] Specifically, the implementation of the indication information (here referring to the second indication information) is as follows: option 1 is indicated by one indication information (e.g., one bit), and option 2 is indicated by two indication information pieces (e.g., two bits each). Specifically:

[0358] Option 1: If the UE reports the indication information of step 1 after completing downlink synchronization, it receives the indication information sent by the network in step 2 and the UE believes that the target satellite's timing can be used to perform the RACH procedure; if the UE reports the indication information of step 1 after completing downlink and uplink synchronization, it receives the indication information sent by the network in step 2 and the UE believes that the target satellite's downlink timing and TA can be used for uplink and downlink transmission.

[0359] Option 2: When the UE receives indication information A, the UE believes that the timing of the target satellite can be used to perform the RACH procedure. When the UE receives indication information B, the UE believes that the down-timing and TA of the target satellite can be used for uplink and downlink transmission. Indication information A and indication information B are two different second indication information in Option 2.

[0360] In addition, the instruction information (referring to the second instruction information here) may also carry the network instruction for the UE to perform the RACH procedure or the downlink timing and TA of the target satellite for uplink and downlink transmission, such as Coordinated Universal Time (UTC) time, or how long after the procedure will be performed.

[0361] Whether the UE reports indication information (here referring to the first indication information) is determined based on network configuration and is communicated via broadcast or dedicated signaling.

[0362] Example 4 (further detailing the process by which the network instructs the UE to obtain uplink synchronization with the target satellite by performing RACH)

[0363] The method for timing target satellites provided in this embodiment includes the following steps:

[0364] The UE reports to the network whether it supports the ability to obtain uplink synchronization with the target satellite via without RACH.

[0365] The network indicates whether the UE obtains uplink synchronization with the target satellite by performing RACH. This indication information (referring to the indication information in the configuration information) can be sent to the UE via system information broadcast (e.g., broadcast in SIB19) or via dedicated signaling.

[0366] If the network is configured to obtain uplink synchronization with the target satellite via without RACH, and if the UE supports obtaining uplink synchronization with the target satellite via without RACH, then the UE obtains uplink synchronization with the target satellite via without RACH; if the network is configured to obtain uplink synchronization with the target satellite via without RACH, and if the UE does not support obtaining uplink synchronization with the target satellite via without RACH, then the UE obtains uplink synchronization with the target satellite via RACH-based method.

[0367] If the network is not configured to obtain uplink synchronization with the target satellite via without RACH, the UE obtains uplink synchronization with the target satellite via RACH-based method.

[0368] Therefore, through any of the above embodiments, the interference problem that may occur in the soft satellite switch scenario is solved, and the network reception complexity and energy consumption are reduced.

[0369] It should be noted that the specific implementation process of the application target satellite timing method, where the UE or base station is the executing entity, can be found in [reference needed]. Figures 2-3 The specific implementation process of the embodiments shown, as well as embodiments three to five, will not be described in detail here.

[0370] Another embodiment of this application provides a method for timing using a target satellite, the method comprising:

[0371] If the RACH-based uplink synchronization method is used, the terminal stops TAT ​​in the t-service.

[0372] If the RACH-based uplink synchronization method is used, the terminal will enable or restart TAT when it receives the TA command.

[0373] If the uplink synchronization method without RACH is used, the terminal performs at least one of the following on the t-service: enables or restarts TAT, and applies N_TA (the timing advance parameter configured in the network).

[0374] If the uplink synchronization method without RACH is used, the terminal performs at least one of the following at t-start: enables or restarts TAT, or applies N_TA (the timing advance parameter configured in the network configuration).

[0375] After obtaining downlink synchronization with the target satellite, the UE performs at least one of the following: enables or restarts T430 (uplink synchronization timer), and the RRC layer notifies the MAC layer that uplink synchronization has been obtained.

[0376] Figure 4 This is a schematic diagram of the structure of the device for timing the target satellite provided in the embodiments of this application, as shown below. Figure 4 As shown, the device for timing the target satellite provided in this embodiment is executed by the terminal UE. The device for timing the target satellite provided in this embodiment includes: a transceiver 400, used to receive and transmit data under the control of the processor 410.

[0377] Among them, Figure 4In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 410 and memory represented by memory 420 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 400 can be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. The user interface 430 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0378] The processor 410 is responsible for managing the bus architecture and general processing, while the memory 420 can store the data used by the processor 410 when performing operations.

[0379] Alternatively, the processor 410 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0380] In this embodiment, the memory 420 is used to store computer programs; the transceiver 400 is used to send and receive data under the control of the processor; and the processor 410 is used to read the computer programs from the memory and perform the following operations:

[0381] Send a first indication message to the base station, the first indication message being used to instruct the UE to obtain synchronization with the target satellite.

[0382] Optionally, the first indication information includes any of the following:

[0383] Instruct the UE to obtain downlink synchronization from the target satellite;

[0384] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0385] Instruct the UE to obtain uplink synchronization from the target satellite.

[0386] Optionally, the processor 410, when sending the first indication information to the base station, specifically includes any one of the following:

[0387] Upon obtaining the downlink timing of the target satellite, the first indication information is sent to the base station;

[0388] Upon obtaining the downlink timing and the timing advance (TA) of the target satellite, the first indication information is sent to the base station;

[0389] Upon obtaining the target satellite's TA, the first indication information is sent to the base station.

[0390] Optionally, the processor 410, when sending the first indication information to the base station, specifically includes any one of the following:

[0391] The first indication information is sent to the base station via the source satellite; or...

[0392] The first instruction information is sent to the base station via the target satellite.

[0393] Optionally, the processor 410 is configured to perform the following operations after sending the first indication information to the base station:

[0394] Receive second instruction information; wherein the second instruction information includes at least one of the following:

[0395] Indicates whether the UE applies the downlink timing of the target satellite;

[0396] Indicate whether the UE should perform a random access procedure;

[0397] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0398] Indicates whether the UE accesses the target satellite;

[0399] The specified time;

[0400] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0401] Optionally, the processor 410, when receiving the second indication information sent by the base station, specifically includes:

[0402] Receive the second indication information sent by the source satellite; or,

[0403] Receive the second instruction information sent by the target satellite.

[0404] Optionally, the processor 410 is configured to perform the following operations before sending the first indication information to the base station:

[0405] Receive the base station configuration information;

[0406] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0407] Optionally, the processor 410, when applying downlink timing of the target satellite, specifically includes the following:

[0408] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or...

[0409] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform a random access procedure, the downlink timing of the target satellite is applied.

[0410] Optionally, the processor 410, when applying the downlink timing and TA of the target satellite, specifically includes any one of the following:

[0411] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied.

[0412] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite.

[0413] The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

[0414] Optionally, the processor 410 is further configured to perform at least one of the following operations:

[0415] Trigger the random access procedure;

[0416] Apply the target satellite's TA;

[0417] Listen to the Physical Downlink Control Channel (PDCCH) of the target satellite;

[0418] Uplink and downlink transmissions are performed according to the downlink timing and TA of the target satellite;

[0419] Restart the timer advance timer TAT;

[0420] Read SIB1;

[0421] Read SIB19.

[0422] Optionally, the processor 410 is further configured to perform the following operations:

[0423] The system reports to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0424] Optionally, the processor 410 is configured to perform the following operations before sending the first indication information to the base station:

[0425] The transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or,

[0426] After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

[0427] Optionally, the processor 410, when receiving the TA of the target satellite before sending the first indication information to the base station, specifically includes:

[0428] Receive the target satellite's TA (Transmission Address) from the source satellite; or,

[0429] Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

[0430] It should be noted that the device for timing target satellites provided in this application can implement all the method steps described in the embodiments of the first aspect above, and its specific implementation process can be referred to Figures 2-3 The embodiments shown, as well as embodiments three to five, can achieve the same technical effects. Therefore, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail here.

[0431] Another embodiment of this application provides an apparatus for applying target satellite timing. The apparatus for applying target satellite timing provided in this embodiment is executed by a UE. The apparatus for applying target satellite timing provided in this embodiment includes:

[0432] The transmitting unit is used to send first indication information to the base station, the first indication information being used to instruct the UE to obtain synchronization with the target satellite.

[0433] Optionally, the first indication information includes any of the following:

[0434] Instruct the UE to obtain downlink synchronization from the target satellite;

[0435] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0436] Instruct the UE to obtain uplink synchronization from the target satellite.

[0437] Optionally, the sending unit is specifically configured to perform any of the following:

[0438] Upon obtaining the downlink timing of the target satellite, the first indication information is sent to the base station;

[0439] Upon obtaining the downlink timing and the timing advance (TA) of the target satellite, the first indication information is sent to the base station;

[0440] Upon obtaining the target satellite's TA, the first indication information is sent to the base station.

[0441] Optionally, the sending unit is specifically used for:

[0442] The first indication information is sent to the base station via the source satellite; or...

[0443] The first instruction information is sent to the base station via the target satellite.

[0444] Optionally, the apparatus further includes: a receiving unit; the receiving unit is configured to receive second indication information after sending the first indication information to the base station; wherein the second indication information includes at least one of the following:

[0445] Indicates whether the UE applies the downlink timing of the target satellite;

[0446] Indicate whether the UE should perform a random access procedure;

[0447] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0448] Indicates whether the UE accesses the target satellite;

[0449] The specified time;

[0450] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0451] Optionally, the receiving unit is specifically used for:

[0452] Receive the second indication information sent by the source satellite; or,

[0453] Receive the second instruction information sent by the target satellite.

[0454] Optionally, the receiving unit is further configured to:

[0455] Before sending the first target indication information to the base station, the information configured by the base station is received;

[0456] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0457] Optionally, the device further includes an application unit; the application unit is configured to:

[0458] Apply the downlink timing of the target satellite, or apply the downlink timing of the target satellite and the target satellite's TA.

[0459] Optionally, the application unit is specifically used to perform the following operations:

[0460] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or...

[0461] After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform RACH, the downlink timing of the target satellite is applied.

[0462] Optionally, the application unit is specifically used to perform any of the following:

[0463] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied.

[0464] After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite.

[0465] The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

[0466] Optionally, the apparatus further includes a processing unit; the processing unit is configured to perform at least one of the following:

[0467] Trigger the random access procedure;

[0468] Apply the target satellite's TA;

[0469] Listen to the Physical Downlink Control Channel (PDCCH) of the target satellite;

[0470] Uplink and downlink transmissions are performed according to the downlink timing and TA of the target satellite;

[0471] Restart the timer advance timer TAT;

[0472] Read SIB1;

[0473] Read SIB19.

[0474] Optionally, the sending unit is further configured to: before sending the first indication information to the base station, report to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0475] Optionally, the transmitting unit is further configured to:

[0476] Before sending the first target indication information to the base station, the transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or,

[0477] After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

[0478] Optionally, the receiving unit is further configured to: receive the target satellite's TA before sending the first target indication information to the base station;

[0479] Specifically, the receiving unit is used for:

[0480] Receive the target satellite's TA (Transmission Address) from the source satellite; or,

[0481] Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

[0482] It should be noted that the device for timing target satellites provided in this application can implement all the method steps described in the embodiments of the first aspect above, and its specific implementation process can be referred to Figures 2-3 The embodiments shown, as well as embodiments three to five, can achieve the same technical effects. Therefore, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail here.

[0483] Figure 5 A schematic diagram of the structure of an application target satellite timing device provided in another embodiment of this application is shown below. Figure 5 As shown, the device for timing the target satellite provided in this embodiment is executed by the base station. The device for timing the target satellite provided in this embodiment includes: a transceiver 500, used to receive and send data under the control of the processor 510.

[0484] Among them, Figure 5 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processor 510) and memory (memory 520). The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 500 can be multiple elements, including transmitters and receivers, providing units for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, etc. The processor 510 is responsible for managing the bus architecture and general processing, and the memory 520 can store data used by the processor 510 during operation.

[0485] The processor 510 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

[0486] In this embodiment, the memory 520 is used to store computer programs; the transceiver 500 is used to send and receive data under the control of the processor; and the processor 510 is used to read the computer programs from the memory and perform the following operations:

[0487] The system receives a first indication message sent by the UE, which is used to instruct the UE to obtain synchronization with the target satellite.

[0488] Optionally, the first indication information includes any of the following:

[0489] Instruct the UE to obtain downlink synchronization from the target satellite;

[0490] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0491] Instruct the UE to obtain uplink synchronization from the target satellite.

[0492] Optionally, the first indication information is sent by the UE to the base station when it obtains the downlink timing of the target satellite; or,

[0493] The first indication information is sent by the UE to the base station when it obtains the downlink timing and TA of the target satellite; or,

[0494] The first indication information is sent by the UE to the base station when it obtains the TA of the target satellite.

[0495] Optionally, the processor, when receiving the first indication information sent by the UE, specifically includes:

[0496] Receive the first indication information sent by the UE via the source satellite; or...

[0497] The first indication information sent by the UE is received by the target satellite.

[0498] Optionally, the processor is configured to perform the following operations after receiving the first indication information sent by the UE:

[0499] Send a second indication message to the UE; wherein the second indication message includes at least one of the following:

[0500] Indicates whether the UE applies the downlink timing of the target satellite;

[0501] Indicate whether the UE should perform a random access procedure;

[0502] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0503] Indicates whether the UE accesses the target satellite;

[0504] The specified time;

[0505] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0506] Optionally, the processor, when sending the second indication information to the UE, specifically includes:

[0507] The second indication information is sent to the UE via the source satellite; or...

[0508] The second instruction information is sent to the UE via the target satellite.

[0509] Optionally, the processor is configured to perform the following operations before receiving the first indication information sent by the UE:

[0510] Send configuration information to the UE;

[0511] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0512] Optionally, the processor is also configured to perform the following operations:

[0513] Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0514] Optionally, the processor, when sending the TA of the target satellite to the UE, specifically includes:

[0515] The target satellite's TA is transmitted to the UE via the source satellite; or...

[0516] The target satellite's TA is transmitted to the UE via the target satellite.

[0517] It should be noted that the device for timing target satellites provided in this application can implement all the method steps described in the embodiments of the second aspect above, and its specific implementation process can be referred to Figures 2-3The embodiments shown, as well as embodiments three to five, can achieve the same technical effects. Therefore, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail here.

[0518] Another embodiment of this application provides an apparatus for timing a target satellite. The apparatus for timing a target satellite provided in this embodiment is executed by a base station. The apparatus for timing a target satellite provided in this embodiment includes:

[0519] The receiving unit is used to receive first indication information sent by the UE, the first indication information being used to instruct the UE to obtain synchronization with the target satellite.

[0520] Optionally, the first indication information includes any of the following:

[0521] Instruct the UE to obtain downlink synchronization from the target satellite;

[0522] Instruct the UE to obtain downlink and uplink synchronization from the target satellite;

[0523] Instruct the UE to obtain uplink synchronization from the target satellite.

[0524] Optionally, the first indication information is sent to the base station by the UE when it obtains the downlink timing of the target satellite;

[0525] The first indication information is sent by the UE to the base station when it obtains the downlink timing and TA of the target satellite;

[0526] The first indication information is sent by the UE to the base station when it obtains the TA of the target satellite.

[0527] Optionally, the receiving unit is specifically used for:

[0528] Receive the first indication information sent by the UE via the source satellite; or...

[0529] The first indication information sent by the UE is received by the target satellite.

[0530] Optionally, the apparatus further includes: a transmitting unit; the transmitting unit is configured to transmit second indication information to the UE after receiving the first indication information transmitted by the UE; wherein the second indication information includes at least one of the following:

[0531] Indicates whether the UE applies the downlink timing of the target satellite;

[0532] Indicate whether the UE should perform a random access procedure;

[0533] Indicates whether the UE uses the target satellite's TA for uplink transmission;

[0534] Indicates whether the UE accesses the target satellite;

[0535] The specified time;

[0536] The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

[0537] Optionally, the sending unit is specifically used for:

[0538] The second indication information is sent to the UE via the source satellite; or...

[0539] The second instruction information is sent to the UE via the target satellite.

[0540] Optionally, the sending unit is further configured to: send configuration information to the UE before receiving the first indication information sent by the UE;

[0541] The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

[0542] Optionally, the receiving unit is further configured to:

[0543] Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

[0544] Optionally, the transmitting unit is specifically used for:

[0545] The target satellite's TA is transmitted to the UE via the source satellite; or...

[0546] The target satellite's TA is transmitted to the UE via the target satellite.

[0547] It should be noted that the device for timing target satellites provided in this application can implement all the method steps described in the embodiments of the second aspect above, and its specific implementation process can be referred to Figures 2-3The embodiments shown, as well as embodiments three to five, can achieve the same technical effects. Therefore, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail here.

[0548] It should be noted that the division of units in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0549] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0550] This application also provides a non-transitory readable storage medium. The non-transitory readable storage medium stores a computer program that causes a processor to execute any of the above-described method embodiments.

[0551] The non-transiently readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memory (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MOs), etc.), optical memory (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (such as ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0552] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0553] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0554] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0555] These processors can execute instructions that can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0556] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for timing target satellites, applied to soft satellite conversion in an unchanged PCI scenario, characterized in that, The method is executed by the terminal UE, and the method includes: When the downlink timing of the target satellite is obtained and / or the timing advance (TA) of the target satellite is obtained, a first indication information is sent to the base station. The first indication information is used to instruct the UE to obtain the synchronization of the target satellite. After sending the first indication information to the base station, the method further includes: Receive second instruction information; wherein the second instruction information includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

2. The method according to claim 1, characterized in that, The first indication information includes any of the following: Instruct the UE to obtain downlink synchronization from the target satellite; Instruct the UE to obtain downlink and uplink synchronization from the target satellite; Instruct the UE to obtain uplink synchronization from the target satellite.

3. The method according to any one of claims 1-2, characterized in that, Sending the first indication information to the base station includes: The first indication information is sent to the base station via the source satellite; or... The first instruction information is sent to the base station via the target satellite.

4. The method according to claim 1, characterized in that, The receipt of the second indication information includes: Receive the second indication information sent by the source satellite; or, Receive the second instruction information sent by the target satellite.

5. The method according to claim 1, characterized in that, Before sending the first target indication information to the base station, the method further includes: Receive the base station configuration information; The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

6. The method according to any one of claims 1-2, characterized in that, The methods for applying downlink timing from the target satellite include: After sending a first indication message to the base station indicating that downlink synchronization has been obtained through access to the serving cell via the target satellite, the downlink timing of the target satellite is applied; or... After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform a random access procedure, the downlink timing of the target satellite is applied.

7. The method according to any one of claims 1-2, characterized in that, The method of applying the downlink timing and TA of the target satellite includes any of the following: After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied. After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite. The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

8. The method according to claim 7, characterized in that, The method further includes at least one of the following: Trigger the random access procedure; Apply the target satellite's TA; Listen to the Physical Downlink Control Channel (PDCCH) of the target satellite; Uplink and downlink transmissions are performed according to the downlink timing and TA of the target satellite; Restart the timer advance timer TAT; Read SIB1; Read SIB19.

9. The method according to claim 1, characterized in that, The method further includes: The system reports to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

10. The method according to claim 1, characterized in that, Before sending the first indication information to the base station, the method further includes: The transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped at a preset time. After obtaining the downlink timing of the target satellite, the SRS is transmitted according to the downlink timing of the target satellite; or, After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

11. The method according to claim 1, characterized in that, The method of receiving the target satellite's TA before sending the first target indication information to the base station includes: Receive the target satellite's TA (Transmission Address) from the source satellite; or, Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

12. A method for applying target satellite timing, used in soft satellite conversion scenarios in unchanged PCI scenarios, characterized in that... The method is executed by a base station, and the method includes: The system receives a first indication message sent by the UE, the first indication message being used to instruct the UE to obtain synchronization with the target satellite, the first indication message being sent to the base station by the UE when it obtains the downlink timing and / or the TA of the target satellite; After receiving the first indication information sent by the UE, the method further includes: Send a second indication message to the UE; wherein the second indication message includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

13. The method according to claim 12, characterized in that, The first indication information includes any of the following: Instruct the UE to obtain downlink synchronization from the target satellite; Instruct the UE to obtain downlink and uplink synchronization from the target satellite; Instruct the UE to obtain uplink synchronization from the target satellite.

14. The method according to any one of claims 12-13, characterized in that, The first indication information received by the UE includes: Receive the first indication information sent by the UE via the source satellite; or... The first indication information sent by the UE is received by the target satellite.

15. The method according to claim 12, characterized in that, Sending the second indication information to the UE includes: The second indication information is sent to the UE via the source satellite; or... The second instruction information is sent to the UE via the target satellite.

16. The method according to claim 12, characterized in that, Before receiving the first indication information sent by the UE, the method further includes: Send configuration information to the UE; The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

17. The method according to claim 12, characterized in that, The method further includes: Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

18. The method according to claim 12, characterized in that, The method of sending the TA of the target satellite to the UE includes: The target satellite's TA is transmitted to the UE via the source satellite; or... The target satellite's TA is transmitted to the UE via the target satellite.

19. A device for applying target satellite timing, used in soft satellite conversion scenarios in unchanged PCI scenarios, characterized in that, The device is executed by the UE, and the device includes: The transmitting unit is configured to send first indication information to the base station when it obtains the downlink timing of the target satellite and / or the timing advance (TA) of the target satellite, wherein the first indication information is used to instruct the UE to obtain synchronization of the target satellite; The receiving unit is configured to receive second indication information after sending the first indication information to the base station; wherein the second indication information includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

20. A device for applying target satellite timing, used in soft satellite conversion scenarios in unchanged PCI scenarios, characterized in that, The device is executed by a base station, and the device includes: A receiving unit is configured to receive first indication information sent by a UE, the first indication information being used to instruct the UE to acquire synchronization with the target satellite, the first indication information being sent to the base station by the UE when it acquires the downlink timing and / or the TA of the target satellite; The transmitting unit is configured to transmit second indication information to the UE after receiving the first indication information transmitted by the UE; wherein the second indication information includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

21. A device for timing target satellites, applied to soft satellite conversion in an unchanged PCI scenario, characterized in that, The device is executed by the UE, and the device includes a memory, a transceiver, and a processor. Memory, used to store computer programs; Transceiver, used to send and receive data under the control of the processor; Processor, configured to read the computer program in the memory and perform the following operations: When the downlink timing of the target satellite is obtained and / or the timing advance (TA) of the target satellite is obtained, a first indication information is sent to the base station. The first indication information is used to instruct the UE to obtain the synchronization of the target satellite. The processor is configured to perform the following operations after sending the first indication information to the base station: Receive second instruction information; wherein the second instruction information includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

22. The apparatus according to claim 21, characterized in that, The first indication information includes any of the following: Instruct the UE to obtain downlink synchronization from the target satellite; Instruct the UE to obtain downlink and uplink synchronization from the target satellite; Instruct the UE to obtain uplink synchronization from the target satellite.

23. The apparatus according to any one of claims 21-22, characterized in that, The processor, when sending first indication information to the base station, specifically includes any one of the following: The first indication information is sent to the base station via the source satellite; or... The first instruction information is sent to the base station via the target satellite.

24. The apparatus according to claim 21, characterized in that, The processor is configured to perform the following operations before sending the first indication information to the base station: Receive the base station configuration information; The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

25. The apparatus according to any one of claims 21-21, characterized in that, The processor, used for downlink timing of the target satellite, specifically includes the following: After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite to access the serving cell, the downlink timing of the target satellite is applied; or, After sending a first indication message to the base station indicating that downlink synchronization has been obtained through the target satellite access serving cell, and receiving a second indication message from the base station instructing the UE to apply the downlink timing of the target satellite to perform a random access procedure, the downlink timing of the target satellite is applied.

26. The apparatus according to any one of claims 21-22, characterized in that, The processor, when applying the downlink timing and TA of the target satellite, specifically includes any one of the following: After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, the downlink timing and TA of the target satellite are applied. After sending a first indication message to the base station indicating that downlink synchronization and uplink synchronization have been obtained through access to the serving cell via the target satellite, and receiving a second indication message from the base station instructing the UE to apply the downlink timing and TA of the target satellite, the UE applies the downlink timing and TA of the target satellite. The downlink timing and TA of the target satellite are applied according to the time specified in the second indication information sent by the base station.

27. The apparatus according to claim 21, characterized in that, The processor is also configured to perform the following operations: The system reports to the base station whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

28. The apparatus according to claim 21, characterized in that, The processor is configured to perform the following operations before sending the first indication information to the base station: At a preset time, the transmission of the Sounding Reference Signal (SRS) according to the downlink timing of the source satellite is stopped. After the downlink timing of the target satellite is obtained, the SRS is transmitted according to the downlink timing of the target satellite. or, After obtaining the downlink timing of the target satellite, the SRS resources configured for the target satellite are sent according to the downlink timing of the target satellite.

29. The apparatus according to claim 21, characterized in that, The processor, when receiving the TA of the target satellite before sending the first indication information to the base station, specifically includes: Receive the target satellite's TA (Transmission Address) from the source satellite; or, Receive the target satellite's TA (Target Information Transfer) sent by the target satellite.

30. A device for timing target satellites, applied to soft satellite conversion in an unchanged PCI scenario, characterized in that, The device is executed by a base station, and the device includes a memory, a transceiver, and a processor. Memory, used to store computer programs; The transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations: The system receives a first indication message sent by the UE, the first indication message being used to instruct the UE to obtain synchronization with the target satellite, the first indication message being sent to the base station by the UE when it obtains the downlink timing and / or the TA of the target satellite; The processor is configured to perform the following operations after receiving the first indication information sent by the UE: Send a second indication message to the UE; wherein the second indication message includes at least one of the following: Indicates whether the UE applies the downlink timing of the target satellite; Indicate whether the UE should perform a random access procedure; Indicates whether the UE uses the target satellite's TA for uplink transmission; Indicates whether the UE accesses the target satellite; The specified time; The specified time is used to indicate at least one of the following: the time when the UE performs a random access procedure, the time when the downlink timing of the target satellite is applied, and the time when the TA of the target satellite is applied.

31. The apparatus according to claim 30, characterized in that, The first indication information includes any of the following: Instruct the UE to obtain downlink synchronization from the target satellite; Instruct the UE to obtain downlink and uplink synchronization from the target satellite; Instruct the UE to obtain uplink synchronization from the target satellite.

32. The apparatus according to any one of claims 30-31, characterized in that, The processor, when receiving first indication information sent by the UE, specifically includes: Receive the first indication information sent by the UE via the source satellite; or... The first indication information sent by the UE is received by the target satellite.

33. The apparatus according to claim 30, characterized in that, The processor is configured to perform the following operations before receiving the first indication information sent by the UE: Send configuration information to the UE; The configured information includes at least one of the following: an instruction for the UE to obtain uplink synchronization information of the target satellite; an instruction for the UE to apply downlink timing of the target satellite; an instruction for the UE to apply downlink timing and TA of the target satellite; a preamble resource dedicated to the target satellite; uplink reference signal resources dedicated to the source satellite; uplink reference signal resources dedicated to the target satellite; and an instruction for the UE to report the first instruction information.

34. The apparatus according to claim 30, characterized in that, The processor is also used to perform the following operations: Receive the UE's report on whether it supports the ability to obtain uplink synchronization without performing a random access procedure.

35. The apparatus according to claim 30, characterized in that, The processor, when sending the TA of the target satellite to the UE, specifically includes: The target satellite's TA is transmitted to the UE via the source satellite; or... The target satellite's TA is transmitted to the UE via the target satellite.

36. A non-transiently readable storage medium, characterized in that, The non-transiently readable storage medium stores a computer program that causes a processor to perform the method according to any one of claims 1 to 18.

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