Network switching method, terminal and network side equipment

Abstract

The invention discloses a network switching method, a terminal and network side equipment, relates to the technical field of wireless communication, and is used for reducing network switching time delay and reducing network switching frequency. The method is applied to the terminal and comprises the following steps: triggering condition switching; and according to the switching command configuration indicated by the base station group, performing cell switching on a target service cell in the base station group by using the RRC connection configuration information multiplexed by the base station group.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a network switching method, a terminal, and a network-side device. Background Technology

[0002] To ensure network service continuity when terminals are mobile, communication systems have introduced handover procedures. Conditional handover is a new handover procedure introduced in non-terrestrial networks of the 5G (5th Generation Mobile Communication Technology) R16 standard. Unlike traditional handover, which is triggered by the network, conditional handover allows the terminal to decide to perform the handover itself when the conditions configured by the source station are met.

[0003] The main problems faced by non-terrestrial network handover include, but are not limited to: the large-scale spacing between nodes in non-terrestrial networks leads to large latency relative to terrestrial systems, resulting in an overall end-to-end latency increase; the high-speed movement of equipment on the non-terrestrial network side causes terminals to inevitably perform frequent network handovers; the large coverage area of ​​a single cell on the non-terrestrial network side equipment and the large number of service terminals may lead to random access congestion and affect service continuity due to a large number of user handovers. Summary of the Invention

[0004] This invention provides a network handover method, terminal, and network-side device to reduce network handover latency and decrease network handover frequency.

[0005] In a first aspect, an embodiment of the present invention provides a network switching method applied to a terminal, the method comprising:

[0006] Trigger condition switching;

[0007] Based on the handover command configuration indicated by the base station group, and utilizing the RRC connection configuration information reused by the base station group, a cell handover is performed to the target serving cell in the base station group.

[0008] The network handover method provided in this embodiment offers a new type of serving cell, treating the entire base station group as a new serving cell type to provide network services to the terminal. By pre-configuring the terminal's handover command settings and utilizing the RRC connection configuration information reused between different base stations, the terminal can autonomously handover between different serving cells. This effectively reduces the handover process and signaling interaction between different base stations within the base station group, reduces network handover latency, lowers network handover frequency, and reduces air interface signaling overhead.

[0009] Secondly, an embodiment of the present invention provides a network handover method applied to a network-side device, the method comprising:

[0010] The handover command configuration of the terminal is determined and indicated to the terminal, wherein the handover command configuration includes the RRC connection configuration information of the base station group multiplexing;

[0011] The terminal initiates cell handover using reused RRC connection configuration information.

[0012] Thirdly, embodiments of the present invention also provide a terminal, the terminal including a processor and a memory, the memory being used to store a program executable by the processor, and the processor being used to read the program in the memory and perform the following steps:

[0013] Trigger condition switching;

[0014] Based on the handover command configuration indicated by the base station group, and utilizing the RRC connection configuration information reused by the base station group, a cell handover is performed to the target serving cell in the base station group.

[0015] Fourthly, embodiments of the present invention also provide a network-side device, which includes a processor and a memory. The memory is used to store a program executable by the processor, and the processor is used to read the program from the memory and perform the following steps:

[0016] The handover command configuration of the terminal is determined and indicated to the terminal, wherein the handover command configuration includes the RRC connection configuration information of the base station group multiplexing;

[0017] The terminal initiates cell handover using reused RRC connection configuration information.

[0018] Fifthly, embodiments of the present invention also provide a network switching device, the device comprising:

[0019] The trigger switching module is used to trigger condition switching;

[0020] The handover execution module is used to perform cell handover to the target serving cell in the base station group according to the handover command configuration indicated by the base station group and using the RRC connection configuration information reused by the base station group.

[0021] Sixthly, embodiments of the present invention also provide a network switching device, the device comprising:

[0022] The handover configuration module is used to determine the handover command configuration of the terminal and instruct it to the terminal. The handover command configuration includes RRC connection configuration information for base station group reuse.

[0023] The handover execution module is used to execute cell handover initiated by the terminal using multiplexed RRC connection configuration information.

[0024] Seventhly, embodiments of the present invention also provide a network switching method, applied to a terminal, the method comprising:

[0025] Trigger a cell handover to the target serving cell in the base station group, where the target serving cell refers to the serving cell in the base station group that will soon serve the terminal.

[0026] Using uplink data carrying a user identifier, a cell handover is performed to the target serving cell; the user identifier represents the user identifier reused by the base station group.

[0027] Eighthly, embodiments of the present invention also provide a network handover method, applied to a network-side device, the method comprising:

[0028] Determine the user identifier that the terminal reuses in the base station group and indicate it to the terminal;

[0029] The terminal initiates a cell handover using uplink data carrying the user identifier.

[0030] In a ninth aspect, embodiments of the present invention also provide a computer storage medium having a computer program stored thereon, which, when executed by a processor, is used to implement the steps of the method described in any one of the first, second, seventh, or eighth aspects.

[0031] In a tenth aspect, this application provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to perform the method described in any one of the first, second, seventh, or eighth aspects.

[0032] These or other aspects of this application will become more apparent in the following description of embodiments. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a traditional switching process provided in an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of a condition switching process provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of transmission delay provided for an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of terminal switching provided in an embodiment of the present invention;

[0038] Figure 5 A schematic diagram illustrating a large number of user switching provided in an embodiment of the present invention;

[0039] Figure 6 This is a flowchart illustrating a network handover method according to an embodiment of the present invention.

[0040] Figure 7 A schematic diagram illustrating a base station group collaboratively providing continuous network services, provided as an embodiment of the present invention;

[0041] Figure 8 A control plane flowchart based on base station group handover is provided for an embodiment of the present invention;

[0042] Figure 9 This invention provides a flowchart for establishing an RRC connection.

[0043] Figure 10 This invention provides a flowchart for establishing an RRC connection.

[0044] Figure 11 An RRC connection reconstruction flowchart is provided as an embodiment of the present invention;

[0045] Figure 12 A flowchart illustrating the implementation of a network handover method according to an embodiment of the present invention;

[0046] Figure 13 A schematic diagram of a public user identifier provided in an embodiment of the present invention;

[0047] Figure 14 A flowchart for public user identifier management provided in an embodiment of the present invention;

[0048] Figure 15 A flowchart illustrating the implementation of a network handover method according to an embodiment of the present invention;

[0049] Figure 16 A flowchart illustrating the implementation of a network handover method according to an embodiment of the present invention;

[0050] Figure 17 A schematic diagram of a terminal provided in an embodiment of the present invention;

[0051] Figure 18 A schematic diagram of a network-side device provided in an embodiment of the present invention;

[0052] Figure 19 A schematic diagram of a network switching device provided in an embodiment of the present invention;

[0053] Figure 20A schematic diagram of a network switching device provided in an embodiment of the present invention;

[0054] Figure 21 A schematic diagram of a terminal provided in an embodiment of the present invention;

[0055] Figure 22 This is a schematic diagram of a network-side device provided in an embodiment of the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0057] In this embodiment of the invention, the term "and / or" describes the relationship between associated 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 associated objects have an "or" relationship.

[0058] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0059] The network switching method provided in this embodiment of the invention can be applied to terminals or network-side devices.

[0060] It should be noted that the terminal is a device with wireless communication capabilities, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as ships); and it can also be deployed in the air (such as airplanes, balloons, and satellites). The terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, VR (virtual reality) terminal, AR (augmented reality) terminal, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical care, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc.; it can also be various forms of UE (User Equipment), MS (Mobile Station), terminal device, etc., which are not limited in this embodiment.

[0061] The network-side equipment can be gNB (the next generation Node B), macro base station, micro base station, CU (Central Unit) or DU (Distributed Unit) in 5G; it can also be satellite, such as GEO (Geosynchronous Earth Orbit) satellite, LEO (Low Earth Orbit) satellite, MEO (Middle Earth Orbit) satellite or HEO (High Earth Orbit) satellite; it can also be a satellite-borne base station under an on-board regeneration architecture, etc. This embodiment does not impose too many limitations on this.

[0062] The application scenarios described in the embodiments of this invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of this invention, and do not constitute a limitation on the technical solutions provided by the embodiments of this invention. As those skilled in the art will know, with the emergence of new application scenarios, the technical solutions provided by the embodiments of this invention are also applicable to similar technical problems.

[0063] Before introducing a network switching method provided by the embodiments of this application, the technical background of the embodiments of this application will be described in detail below for ease of understanding.

[0064] To ensure network service continuity during terminal mobility, communication systems have introduced handover procedures. Mobile communication network handover technology refers to the process by which a mobile device switches from one base station (or cell) to another in a wireless communication network. Mobile communication network handover technology is a crucial means of ensuring communication quality and seamless connectivity, and is essential for improving communication efficiency and user experience. Conditional handover is a new handover procedure introduced in 5G R16 non-terrestrial networks. Unlike traditional handover, which is triggered by the network, conditional handover allows the terminal to decide to perform the handover itself when the conditions configured by the source station are met. For example... Figure 1 As shown in the figure, this embodiment provides a traditional handover process, which includes three parts: handover preparation, handover execution, and handover completion. The specific process is as follows:

[0065] Step 100: Mobility control information provided by AMF (Access and Mobility Management Function);

[0066] Step 101, Measurement Control and Reporting;

[0067] Step 102: Handover Decision;

[0068] Step 103: Switch request;

[0069] Step 104, Access Control;

[0070] Step 105: Confirm the switch request;

[0071] Step 106: RAN (Radio Access Network) handover begins;

[0072] During implementation, buffered and new data are transferred from the UPF (User Plane Function); data is separated from the old cell and synchronized to the new cell.

[0073] Step 107a, Early state transition;

[0074] Step 107: SN (Service Network) state transition;

[0075] Among them, buffered user data comes from the source gNB;

[0076] Step 108: RAN handover complete;

[0077] Step 108a: Switching successful;

[0078] Step 108b, SN state transition;

[0079] Step 109, Path Switching Request;

[0080] Step 110: Path switching in UPF;

[0081] End marker;

[0082] Step 111: Confirmation of path switching request;

[0083] Step 112: UE (User Equipment) context publication.

[0084] like Figure 2 As shown in the figure, this embodiment provides a conditional switching process, which includes three parts: switching preparation, switching execution, and switching completion. The specific process is as follows:

[0085] Step 200: Mobility control information provided by AMF;

[0086] Step 201, Measurement Control and Reporting;

[0087] Step 202: CHO (Conditional Handover) decision;

[0088] Step 203: Switch request;

[0089] Step 204, Access Control;

[0090] Step 205: Confirm the switch request;

[0091] Step 206: Reconfigure RRC (Radio Resource Control) protocol;

[0092] Step 207: RRC reconfiguration complete;

[0093] Step 207a, Early state transition;

[0094] Assess CHO conditions; separate from old communities and synchronize to new communities;

[0095] Step 208: CHO switching complete;

[0096] Step 208a: Switching successful;

[0097] Step 208b, SN state transition;

[0098] Step 208c: Switch Cancel.

[0099] The main challenges of non-terrestrial network handover are as follows:

[0100] Problem 1: Increased switching time.

[0101] like Figure 3 As shown in the diagram, this embodiment provides a transmission delay illustration. The large-scale spacing between nodes in a non-terrestrial network results in a large delay relative to the terrestrial system. The propagation delay between satellite and ground is distance-dependent, typically ranging from a few milliseconds to tens of milliseconds in one direction. The propagation delay between satellite and ground, and between satellites, affects the overall end-to-end handover delay.

[0102] Question 2: Frequent switching.

[0103] like Figure 4 As shown in the diagram, this embodiment provides a terminal handover schematic. Under the on-board regeneration architecture, the high-speed movement of the satellite-borne base station inevitably leads to UE handover. Every so often, the terminal's serving cell changes, as illustrated in the diagram. The handover cycle is related to the constellation configuration and is approximately the side length or diameter of the cell's coverage area divided by the relative speed between the satellite and the terminal. Assuming the cell's coverage diameter is approximately 10km-20km and the satellite's moving speed is 7.6km / s, the handover cycle is approximately 1-3 minutes. Frequent periodic handovers directly result in higher handover overhead compared to terrestrial networks. Frequent handovers also exacerbate other potential mobility-related problems, such as handover failures and service interruptions leading to a decline in service performance.

[0104] Question 3: Too many users switching between accounts.

[0105] like Figure 5 As shown in the diagram, this embodiment provides a schematic diagram of a large number of user handovers. The satellite-based base station has a large coverage area per cell and serves a large number of terminals. As shown in the diagram, the movement of the satellite-based base station results in a limited service duration for the corresponding single satellite on the ground. With the movement of the satellite-based base station, all UEs within the original coverage area need to be handed over at regular intervals. A large number of user handovers may lead to random access congestion and poor service continuity.

[0106] In the existing solution, the terminal can obtain the cell information and new user context configuration in advance and actively switch over. However, the handover process still requires random access, and the user context may also change. There is no optimization in terms of signaling and terminal processing.

[0107] To address the aforementioned issues, this embodiment provides a network handover method that fully leverages the characteristics of non-terrestrial networks, such as known constellation information, reportable terminal location information, predictable serving cells, and determinable cell service duration. This solves problems like frequent passive handovers and a large number of users switching. This embodiment provides a new type of serving cell, treating the entire base station group as a new serving cell type to provide network services to the terminal. By pre-configuring the RRC connection configuration information reused between different base stations in the base station group, the terminal can autonomously handover between target cells in each base station group. This effectively reduces the handover process and signaling interaction between different base stations within the base station group, lowers network handover frequency, reduces network handover latency, and reduces air interface signaling overhead.

[0108] like Figure 6 As shown, the network switching method provided in this embodiment is applied to a terminal, and the specific implementation process of the method is as follows:

[0109] Step 600: Switching trigger conditions;

[0110] It should be noted that conditional handover allows the terminal to decide to perform a handover when the conditions configured by the source server are met. This embodiment provides one or more of the following methods to trigger conditional handover:

[0111] Method a: The terminal can trigger condition switching based on existing process terminals. For example, the terminal can trigger condition switching based on current location information, signal quality, and other information.

[0112] Method b: The handover command configuration of the base station group in this application can be used to trigger conditional handover.

[0113] Method b1: In response to the service order and service time of the serving cells in the base station group meeting the first handover condition, a cell handover to the target serving cell in the base station group is triggered.

[0114] For example, a terminal can trigger conditional handover by configuring one or more of the following based on the service order, service time, and handover time to a serving cell in the base station group within the included base station group configuration.

[0115] In practice, if the service time of the terminal's current serving cell has reached the service time configured for that serving cell, the terminal can switch to the next target serving cell according to the service order.

[0116] Method b2: In response to the terminal's signal quality meeting the second handover condition, a cell handover is triggered to the target serving cell in the base station group.

[0117] In practice, if the terminal detects that the signal quality in the current serving cell is lower than the threshold, it will switch to the next target serving cell according to the service order of the serving cells in the base station group.

[0118] This embodiment does not impose too many restrictions on the specific triggering conditions for switching trigger conditions.

[0119] Step 601: According to the handover command configuration indicated by the base station group, use the RRC connection configuration information reused by the base station group to perform cell handover to the target serving cell in the base station group.

[0120] Specifically, utilizing the RRC connection configuration information reused by the base station group refers to using the RRC connection configuration information reused between different base stations in the base station group to perform cell handover to the target serving cell in the base station group. Within the base station group, the terminal has common RRC connection configuration information for reuse by different base stations in the group. Different base stations in the base station group share the same terminal's RRC connection configuration information.

[0121] In implementation, this embodiment provides cell handover services to terminals through a new serving cell in the form of a base station group. By configuring the terminal with RRC connection configuration information that is reused between different base stations in the base station group, the handover command configuration instruction containing the reused RRC connection configuration information between different base stations is given to the terminal. The terminal uses the reused RRC connection configuration information between different base stations to perform cell handover to the target serving cell, saving the interaction process of transmitting RRC connection configuration information when handover between different base stations. This allows the base station group to be treated as a whole serving cell, reducing the handover signaling interaction and handover process within the base station group.

[0122] In practice, the handover command configuration indicated by the base station group to the terminal includes RRC connection configuration information reused between different base stations.

[0123] Optionally, the base station group in this embodiment is used to provide network services to terminals in a preset area. The base stations in this embodiment include, but are not limited to, spaceborne base stations, satellite base stations, and terrestrial base stations; this embodiment does not impose excessive limitations on these. Optionally, the base station group in this embodiment includes multiple base stations, and the multiple base stations can be of the same type, for example, all base stations in the base station group are spaceborne base stations; or they can be different, for example, the base station group includes, but is not limited to, one or more of spaceborne base stations, satellite base stations, and terrestrial base stations, and each type of base station can be one or more.

[0124] Since the primary reason for handover to ground terminals is terminal movement, while in satellite-based base station scenarios the primary reason for handover is the high-speed movement of the base station, handover is unavoidable. Due to the determinism of ephemeris data, base stations and terminals can combine predictive information such as constellation, terminal location, beam management, and beam position to know in advance the target cell and the timing of handover. Therefore, this embodiment proposes a new type of serving cell for a base station group, defining a base station group as a set of base stations serving a fixed ground area over a period of time. The forms of base station groups include, but are not limited to, Satellite Cooperative Basestation Sets (SCBS), or combinations of SCBS and ground base stations.

[0125] In this embodiment, the determination of the base station group is based on ephemeris information. The specific number of base stations included in a base station group can be determined by the actual network deployment and operation. Taking a base station group including satellite-borne base stations as an example, the satellite-borne base stations that serve the fixed ground area sequentially over a period of time can be obtained by referring to ephemeris information and the distance between the satellite-borne base stations and the fixed ground area, and these satellite-borne base stations can be set as a base station group. For example, a base station group can be multiple consecutive adjacent base stations (satellite-borne base stations) on the same orbit that continuously serve the fixed ground area. Base station groups can serve as a new type of serving cell. When a terminal has the ability to access a base station group and the base stations have the ability to form a base station group, continuous multi-base station service can be achieved for the terminal.

[0126] In some embodiments, the handover command configuration includes the service order of the serving cells in the base station group; in this embodiment, the target serving cell can also be determined according to the service order of the serving cells in the base station group.

[0127] In implementation, the service order of serving cells in a base station group can be the service order of serving cells among different base stations in the base station group. Optionally, in this embodiment, a base station in a base station group can correspond to one or more serving cells. When one base station in the base station group provides multiple serving cells, the handover command configuration includes the service order of each serving cell in the base station group.

[0128] In some embodiments, this embodiment determines the target serving cell based on the service order of the serving cells in the base station group through any one or more of the following methods:

[0129] Method a: If the source base station is a base station outside the base station group, determine the target serving cell as the serving cell that is first in the service order;

[0130] Method b: If the source base station is a base station within the base station group, determine the target serving cell as the next serving cell in the service sequence.

[0131] In practice, the source base station refers to the base station where the terminal is currently serving the cell.

[0132] In some embodiments, the handover command configuration includes the service time of the serving cell in the base station group. In this embodiment, the target serving cell can be determined based on the service time of the serving cell in the base station group.

[0133] In some embodiments, the handover command configuration includes the time for handover to the serving cell in the base station group; in this embodiment, the target serving cell can also be determined based on the time for handover to the serving cell in the base station group.

[0134] Optionally, the base station group includes multiple base stations, each corresponding to a serving cell. The base station group can be used as a whole serving cell to provide services to the terminal. The terminal is configured to switch to the target serving cell according to the indicated handover command, and performs cell handover between different base stations in the order of service of the serving cells of each base station in the base station group.

[0135] During implementation, such as Figure 7 As shown in the diagram, this embodiment provides a schematic of a base station group cooperating to provide continuous network services. It is assumed that base station A, base station B, and base station C form a base station group, and the service order of the serving cells of each base station within the group for the terminal is base station A, base station B, and base station C, respectively. When the base station (source base station) where the terminal's current serving cell is located sends a handover request (carrying the terminal's session connection configuration) to base station A, base station A determines whether the terminal can access the network. If it can, it generates RRC connection configuration information multiplexed among the base stations and forwards the handover request, the RRC connection configuration information, and the estimated effective time to base stations B and C. If all base stations in the base station group can accept the handover, base station A sends a handover response to the source base station, which then sends the handover command configuration of the base station group to the terminal via a reconfiguration message. The terminal can switch between serving cells of different base stations within the base station group without triggering a handover process based on random access.

[0136] In some embodiments, the handover command configuration includes reserved resources of the base station group; in this embodiment, the terminal performs cell handover to the target serving cell through the following steps:

[0137] Uplink data is sent to the base station where the target serving cell is located using the reserved resources of the base station where the target serving cell is located;

[0138] Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

[0139] In practice, the terminal sends uplink data to the target serving cell on the reserved resources of the base station where the target serving cell is located. When the base station where the target serving cell is located successfully receives the uplink data, it is determined that the terminal has successfully switched to the target serving cell.

[0140] During implementation, the terminal performs downlink synchronization based on the service order of the serving cells among different base stations in the base station group and other configuration information reused between different base stations, using the primary and secondary synchronization information of the serving cells. Uplink synchronization is pre-synchronized by the terminal using its own location and ephemeris information. After pre-synchronization, the terminal transmits uplink data on reserved resources. When the base station correctly receives the uplink data, it considers the handover complete and can notify each base station terminal that it has switched to the target serving cell.

[0141] Optionally, the reserved resources include, but are not limited to, specified access resources or specified uplink shared resources. Optionally, the reserved resources may be dedicated time-frequency resources or public time-frequency resources for uplink transmission.

[0142] When the reserved resource is a designated access resource, by configuring the designated access resource for the terminal, the base station correctly receives the first uplink data reported by the terminal on the access resource, and considers the uplink synchronization to be complete.

[0143] When the reserved resources are designated uplink shared resources, the terminal is configured with dedicated PUSCH (Physical Uplink Shared Channel) resources or PUSCH resources shared by multiple users. This includes information such as PUSCH time-domain information, PUSCH frequency-domain information, and modulation scheme. After receiving the handover command configuration, the terminal uses the designated resource to send uplink data. If the base station correctly receives the data, it considers uplink synchronization complete. After uplink synchronization with the designated base station, the terminal sends a handover completion message to all base stations in the base station group except the designated base station, indicating that the terminal has successfully handed over to the target serving cell of the designated base station. The designated base station refers to the first base station in the base station group in terms of its order.

[0144] In practice, after a designated base station successfully receives uplink data from a terminal, it can also notify the terminal's source base station to release the terminal's context.

[0145] In some embodiments, this embodiment also provides a common user identifier (C-UEID) for the terminal across a base station group, which is used by the terminal to reuse the user identifier among different base stations in the base station group. Although the service duration of each cell in a non-terrestrial network is short, the serving cell is predictable. To improve the service continuity of the terminal across a series of serving cells, this embodiment also proposes a common user identifier (C-UEID) for a base station group. By introducing C-UEID, the terminal does not need to go through a handover procedure to obtain a new user identifier in the target serving cell (the cell to which it is about to hand over), thereby minimizing the handover process between different serving cells.

[0146] In some embodiments, the handover command configuration includes the user identifier reused by the base station group; the user identifier reused by the base station group means that the user identifier can be reused by different base stations in the base station group, and different base stations within the same base station group can share the same terminal's user identifier. This embodiment can also perform cell handover within a base station group in the following manner:

[0147] If the source base station is a base station within the base station group, send uplink data and the user identifier to the base station where the target serving cell is located;

[0148] Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

[0149] The user identifier reused in the base station group refers to the user identifier reused among different base stations within the base station group. The terminal has a common user identifier within the base station group, which is reused among different base stations within the user base station group.

[0150] In practice, when a terminal initially accesses or switches to the target serving cell of the base station group, the terminal obtains the user identifier reused between different base stations within the base station group. In this embodiment, when performing cell handover within the base station group, since the RRC connection configuration information of the terminal and the user identifier of the terminal are reused between each base station, cell handover can be achieved by sending uplink data and the user identifier, saving the cell handover process and handover signaling interaction between different base stations within the base station group.

[0151] The terminal determines the uplink data based on ephemeris information and current location information. Following the service order of serving cells in the base station group, the base station of the current serving cell uses reserved resources to send the uplink data and user identifier to the base station of the next serving cell. When the base station of the next serving cell successfully receives the uplink data, it can send an acknowledgment message to the terminal, confirming a successful handover. The terminal can also notify the base station of the current serving cell to release the terminal's context.

[0152] In some embodiments, the user identifier includes a cell identifier and a cell user identifier; the cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal; the cell user identifier is the identifier assigned to the terminal by the serving cell of the first base station.

[0153] In this embodiment, the terminal can perform signalless handover between base stations within the base station group. Specifically, the terminal actively triggers the handover according to the configured service order and service time, and / or the terminal's signal quality. The terminal estimates the uplink synchronization value based on ephemeris information and its current location, and sends the estimated uplink synchronization value and a user identifier multiplexed between different base stations to the base station where the target serving cell is located using pre-configured uplink resources. Upon receiving the uplink data and user identifier from the terminal, the base station where the target serving cell is located sends an acknowledgment message to the terminal, indicating a successful handover. The target serving cell refers to the next serving cell in the base station group according to the service order. After successfully receiving the uplink data from the terminal, the base station where the target serving cell is located notifies the source base station to release the terminal's context. The source base station refers to the base station where the terminal was serving the current serving cell before the handover. Optionally, the source base station in this embodiment can be a base station within the base station group or a base station outside the base station group; this embodiment does not impose excessive limitations on this.

[0154] Optionally, the handover command configuration in this embodiment can be reused among the base stations in the base station group. The handover command configuration includes, but is not limited to, any one or more of the following:

[0155] Option a: Reusable RRC connection configuration information;

[0156] This includes configuring a common RRC connection configuration for the terminal within the base station group, allowing each base station in the group to reuse the same RRC connection configuration.

[0157] Option b, session connection configuration;

[0158] This involves notifying each base station in the base station group of the terminal's session connection configuration for network handover between base stations.

[0159] Option c: Reusable user ID;

[0160] In this configuration, any base station in the base station group can configure a user identifier for the terminal, which can be reused among multiple base stations.

[0161] Option d: The service order of serving cells in the base station group;

[0162] The service order of each serving cell in the base station group is fixed after configuration.

[0163] Option e, service time of the serving cell in the base station group;

[0164] Option f specifies the time to switch to each serving cell in the base station group.

[0165] This indicates the relative or absolute time at which the terminal prepares to switch to the target serving cell; for example, the terminal switches to the target serving cell B at a certain time, or the terminal switches to the target serving cell B after the current serving cell has been in use for a certain period of time.

[0166] Option g: Reserved resources for different base stations in the base station group.

[0167] Reserved resources refer to pre-configured uplink resources; these pre-configured uplink resources can be dedicated time-frequency resources or common time-frequency resources used for uplink transmission. These uplink resources can be used by the terminal to report the first uplink data for uplink synchronization.

[0168] h option, other extended configurations.

[0169] During implementation, as a base station moves, it triggers a handover of the terminal's serving base station. The source base station sends a handover request to the designated base station in the base station group. The designated base station in the base station group determines whether it can accept the terminal based on the session connection configuration carried in the handover request sent by the source base station and the service order and service time of the serving cells in the base station group included in the handover command configuration configured for the terminal. If it can accept the terminal, it sends a handover response to the source base station, which then forwards the handover command configuration sent by the designated base station to the terminal. Base stations within the base station group reserve resources for the terminal sequentially according to the service order and expected service time. When the terminal determines that it needs service from the next serving cell in the base station group, it directly uses the reserved resources to send uplink data and a multiplexed user identifier to the base station where the next serving cell is located. After receiving the uplink data and user identifier, the base station where the next serving cell is located sends an acknowledgment message to the terminal. At the same time, it looks up the context corresponding to the terminal through the user identifier and notifies the base station where the source serving cell is located of the terminal's context release process. The terminal's serving cell changes to the next serving cell.

[0170] like Figure 8 As shown in the figure, this embodiment provides a control plane flow based on base station group handover, wherein the base station group includes base station A and base station B. The specific implementation steps of this flow are as follows:

[0171] Step 800: Base station group pre-configuration;

[0172] In practice, the base station group includes base station A and base station B. The service order of the target cells of the base stations in the base station group is the target cell of base station A, and then the target cell of base station B.

[0173] The network determines the base station group configured for the terminal based on ephemeris information and the terminal's location, and configures each base station within the base station group through operation and control or network management. Optionally, the configuration content for pre-configuring the base station group in this embodiment includes, but is not limited to, the base station group ID, the satellite IDs within the base station group, the base station IDs, the IP (Internet Protocol) addresses of the base stations within the base station group, and the service order of the base stations within the base station group.

[0174] Step 801: The source base station sends a handover request to the designated base station in the base station group;

[0175] During implementation, the terminal reports measurement information. As the base station moves, the terminal's target serving cell is the serving cell of the designated base station within its base station group. The designated base station is the first base station in the base station group to serve the terminal.

[0176] After receiving a handover request, the designated base station in the base station group forwards it to other base stations in the group. The other base stations then send a handover response to the first base station to notify the designated base station that they have received the handover request from the terminal.

[0177] Step 802: The designated base station of the base station group sends a handover response to the source base station, carrying the handover command configuration;

[0178] In practice, the designated base station in the base station group determines whether it can accept the terminal based on the session connection configuration carried in the handover request sent by the source base station, as well as the service order and service time of the serving cells of different base stations within the base station group. If it can accept the terminal, it sends a handover response to the source base station. The base stations within the base station group then configure reserved resources for the terminal in the order of service and service time.

[0179] Step 803: The source base station sends a handover command containing the handover command configuration to the terminal;

[0180] In practice, the source base station triggers a handover based on the measurement information reported by the terminal. The measurement information includes, but is not limited to, measurements of terminal signal quality and terminal location. This embodiment does not impose too many restrictions on this.

[0181] Step 804: The terminal sends a handover completion message to the base stations in the base station group;

[0182] After the terminal performs uplink synchronization with the designated base station in the base station group, it sends a handover completion message to the designated base station in the base station group, indicating that the terminal has successfully switched to the base station group.

[0183] Step 805: The designated base station of the base station group sends a handover completion message to the source base station;

[0184] The base station group sends a handover completion message to the source base station to notify the source base station to release the context of the terminal;

[0185] Step 806: The terminal sends the uplink synchronization value and user identifier to the base station where the next serving cell is located;

[0186] The terminal estimates the uplink synchronization value based on ephemeris information and current location, and sends the uplink synchronization value and user identifier to the base station where the next serving cell is located on the reserved resources within the base station group.

[0187] Step 807: The next serving cell's base station notifies the designated base station to release the terminal's context;

[0188] Among them, the next serving cell base station correctly receives the uplink synchronization value of the terminal and notifies the designated base station to release the context of the terminal;

[0189] Step 808: The base station of the next serving cell sends a confirmation message to the terminal;

[0190] In this process, the base station of the next serving cell correctly receives the uplink synchronization value from the terminal, sends an acknowledgment message to the terminal, and confirms that the terminal handover was successful.

[0191] Within the base station group of this embodiment, the terminal reports terminal identification information and uplink data through preset physical layer resources to achieve handover from base station A to base station B. However, in terms of air interface procedures, random access and a series of handover interactions can be omitted, reducing the signaling of interactions, thereby reducing the handover signaling plane latency and improving handover efficiency.

[0192] This embodiment also provides a method for configuring a new serving cell / base station group and a method for obtaining terminal capabilities. The terminal can obtain whether the UE has the capability to support the new serving cell type through system information, RRC connection establishment procedure or RRC connection reconfiguration message. When it is determined that the UE supports the new serving cell type, the handover command configuration can be obtained through system information, RRC connection establishment procedure or RRC connection reconfiguration message.

[0193] In some embodiments, this embodiment can obtain the switching command configuration through any one or more of the following methods:

[0194] Method 1) Send a request message to the base station group and receive a response message sent by the base station group, wherein the response message carries the handover command configuration.

[0195] In practice, a request message is sent to any one of the base stations in the base station group, and a response message is received from any one of the base stations, the response message carrying the handover command configuration; or,

[0196] A request message is sent to a designated base station in the base station group, and a response message is received from the designated base station, the response message carrying the handover command configuration. The designated base station refers to the base station in the base station group that is the first serving cell to provide service to the terminal according to the service order.

[0197] Optionally, the request message may carry whether the terminal has the ability to access the serving cell in the base station group.

[0198] Optionally, the request message includes any one or more of the following:

[0199] 1) Handover request; indicating whether the terminal has the ability to access the serving cell in the base station group.

[0200] In some embodiments, when the request message is a handover request, the base station in the base station group is a designated base station, which refers to the base station of the serving cell that first serves the terminal in the base station group according to the service order.

[0201] In practice, a handover request is sent to a designated base station in the base station group, where the designated base station represents the base station of the serving cell that first serves the terminal in the service order of the base station group; a response message is received from the designated base station, the response message carrying the handover command configuration.

[0202] The terminal sends a handover request to a designated base station in the base station group through the source base station. This handover request carries session connection configuration. The designated base station configures the terminal according to the session connection configuration and then sends the handover command configuration instruction to the terminal. In this embodiment, the source base station refers to the base station currently serving the terminal before cell handover. The source base station can be a base station in another base station group or a base station outside of a base station group; this embodiment does not impose excessive limitations on this.

[0203] During implementation, as a base station moves, it triggers a handover of the terminal's serving cell. The source base station sends a handover request to the designated base station in the base station group. The designated base station determines whether it can accept the terminal based on the session connection configuration carried in the handover request sent by the source base station, as well as the service order and service time of the serving cells of each base station in the base station group configured for the terminal. If it can accept the terminal, it sends a handover response to the source base station, which then forwards the handover command configuration sent by the designated base station to the terminal. Base stations within the base station group reserve resources for the terminal sequentially according to their service order and expected service time.

[0204] In practice, terminal capabilities and handover command configurations can also be obtained through the RRC connection establishment process. When the UE and the base station (which can be the source base station or the first base station in the base station group) establish an RRC connection, the UE can proactively report whether it supports the new serving cell type. When the serving cell is a target serving cell belonging to a base station group, the base station can also proactively inquire whether the UE supports the new serving cell type. Once the base station learns that the UE supports accessing the base station group, it can send the handover command configuration containing the base station group to the UE. If either the UE or the base station does not support the serving cell / new serving cell of the base station group, a traditional handover procedure will be performed during handover. This can be triggered by an RRC establishment request or an RRC establishment completion message.

[0205] 2) RRC establishment request; indicating whether the terminal has the ability to access the serving cell in the base station group.

[0206] During implementation, the terminal and the base station establish an RRC connection, and the terminal sends terminal capability information to the base station; in response to the terminal having the capability to access the serving cell corresponding to the base station group, the terminal receives the RRC connection establishment message sent by the base station.

[0207] like Figure 9 As shown, this embodiment provides an RRC connection establishment procedure, which can be used to configure a new serving cell for a terminal (UE). The specific procedure is as follows:

[0208] Step 900: The terminal sends an RRC Setup Request message to the base station;

[0209] In this process, the terminal carries terminal capability information in the RRC establishment request message, which is used to report whether the terminal has the capability to access the serving cell corresponding to the base station group and request to establish an RRC connection.

[0210] Step 901: The base station sends an RRC setup message (RRCSetup message) to the terminal;

[0211] If the UE has the ability to access the serving cell corresponding to the base station group, the handover command configuration is carried in the RRCSetup message;

[0212] Step 902: The terminal sends an RRC setup complete message (RRCSetupComplete message) to the base station, indicating that the RRC connection has been successfully established.

[0213] The terminal capability information indicates whether the terminal has the ability to access the serving cell corresponding to the base station group; the terminal capability information is used to indicate whether the base station sends a handover command configuration to the terminal.

[0214] 3) RRC establishment complete message; carries whether the terminal has the ability to access the serving cell in the base station group.

[0215] In practice, the terminal and the base station establish an RRC connection. The terminal receives a capability reporting message sent by the base station and sends terminal capability information to the base station. In response to the terminal having the capability to access the serving cell corresponding to the base station group, the terminal receives an RRC connection establishment message sent by the base station.

[0216] like Figure 10 As shown, this embodiment provides an RRC connection establishment process, which can be used to configure a new serving cell for a terminal. The specific process is as follows:

[0217] Step 1000: The terminal sends an RRC setup request message to the base station;

[0218] In practice, the RRC establishment request message carries the UE's initial UE-Identity and establishment cause, requesting the establishment of an RRC connection;

[0219] Step 1001: The base station sends an RRC setup message (RRCSetup message) to the terminal. The RRC setup message carries information on whether the terminal has the ability to access the serving cell corresponding to the base station group.

[0220] Step 1002: The terminal sends an RRC setup complete message (RRCSetupComplete message) to the base station, carrying whether the terminal has the ability to access the serving cell corresponding to the base station group;

[0221] The RRC establishment completion message includes an added 1-bit indicator to inform the base station whether the terminal has the ability to access the serving cell corresponding to the base station group, indicating that the RRC connection has been successfully established.

[0222] Step 1003: If the terminal has the ability to access the serving cell corresponding to the base station group, the base station sends a handover command configuration to the terminal.

[0223] The terminal capability information indicates whether the terminal has the ability to access the serving cell corresponding to the base station group; the terminal capability information is used to indicate whether the base station sends a handover command configuration to the terminal.

[0224] 4) System message; indicating whether the terminal has the ability to access the serving cell in the base station group.

[0225] In practice, the terminal receives a terminal capability query message from the base station and sends terminal capability information to the base station. If the terminal has the capability to access the serving cell corresponding to the base station group, the terminal receives system information from the base station, which carries handover command configuration. The terminal capability information indicates whether the terminal has the capability to access the serving cell in the base station group.

[0226] In implementation, the base station sends a UE capability Enquiry message to the terminal, requesting the terminal to notify it of its capabilities. The terminal responds to the base station's request by sending a UE capabilityInformation message with a newly added field. Specifically, a "supportOfNewCellconfig" or "supportOfSCBS" field can be added to the NTN-Parameters IE (NTN (Non-Terrestrial Network) - Parameters information element) in this response message to indicate whether the terminal has the capability to support access to the serving cell corresponding to the base station group. When this field indicates "supported", it means that the UE supports access to the new serving cell type or the serving cell corresponding to the satellite group. When this field indicates other content, it means that the UE does not support access, and the subsequent process can be handled in the traditional way of UE accessing physical cells. The following is an example of the parameter information element specifically configured in the NTN-Parameters IE:

[0227]

[0228]

[0229] Method 2) Receive the RRC reconfiguration message sent by the base station group, the RRC reconfiguration message carrying the handover command configuration.

[0230] In implementation, an RRC reconfiguration message sent by a base station in the base station group is received, the RRC reconfiguration message carrying the handover command configuration. Optionally, an RRC reconfiguration message sent by any base station in the base station group is received; or, an RRC reconfiguration message sent by a designated base station in the base station group is received; the designated base station refers to the base station of the serving cell that first serves the terminal in the base station group according to the service order.

[0231] like Figure 11 As shown in the figure, this embodiment provides an RRC connection reconstruction process, which can be used to configure a new serving cell for the terminal. The specific process is as follows:

[0232] Step 1100: The base station sends an RRC reconfiguration message to the terminal, carrying the handover command configuration;

[0233] Step 1101a: The terminal sends an RRC reconfiguration complete message (RRCReconfigurationComplete message) to the base station, and the RRC reconfiguration process is completed;

[0234] If the terminal sends an RRC reconfiguration complete message to the base station, it means that the terminal has the ability to access the serving cell of the base station group. According to the received handover command configuration, it can access the serving cell of the corresponding base station group to realize network handover.

[0235] Step 1101b: If the RRC reconfiguration process fails, an RRC connection re-establishment process is performed between the terminal and the base station.

[0236] If the RRC reconfiguration process fails, one reason is that the terminal does not support the ability to access the serving cell of the base station group. Therefore, the terminal and the base station will perform an RRC connection re-establishment process, which will be executed according to the traditional handover process. Another reason is that the terminal supports the ability to access the serving cell of the base station group, but the reconfiguration fails for some reason. In this case, the RRC connection re-establishment process can be performed.

[0237] In some embodiments, this embodiment also provides a network switching method, such as... Figure 12 As shown, the specific implementation process of this method is as follows:

[0238] Step 1200: Trigger a cell handover to the target serving cell in the base station group, where the target serving cell refers to the serving cell in the base station group that will soon serve the terminal;

[0239] Step 1201: Using uplink data carrying a user identifier, perform a cell handover to the target serving cell, where the user identifier represents the user identifier reused by the base station group.

[0240] In some embodiments, this embodiment also provides a common user identifier for the terminal in a cell set, which the terminal reuses in the cell set. Although the service duration of each cell in a non-terrestrial network is short, the serving cell is predictable. To improve the service continuity of the terminal in a series of serving cells, this embodiment also proposes a cell set-oriented user identifier (C-UEID). The cell set in this embodiment includes, but is not limited to, some or all of the serving cells corresponding to a base station group; the cell set in this embodiment represents multiple cells that continuously provide network services to the terminal, and can be a series of cells serving the terminal sequentially. By introducing C-UEID, the terminal does not need to obtain a new user identifier in the target cell (the cell to which it is about to switch) through a handover procedure, thereby minimizing the handover process between cells.

[0241] In some embodiments, when a terminal initially accesses or switches to a cell set, the terminal obtains a user identifier; wherein the cell set represents multiple cells that continuously provide network services to the terminal; and the common user identifier represents a unique user identifier shared by the terminal among the cells in the cell set.

[0242] Optionally, in this embodiment, multiple cells in the cell set have unique cell identifiers. The cells in this embodiment may include cells corresponding to base stations outside the base station group, some or all of the serving cells corresponding to base station groups, and cells corresponding to base stations in the base station group and base stations outside the base station group.

[0243] As an optional implementation, this embodiment may also perform the following steps:

[0244] Send an access request to the first base station in the base station group, where the first base station represents the first base station in the base station group to establish a connection with the terminal.

[0245] Receive the user identifier sent by the first base station;

[0246] The user identifier is sent to all base stations in the base station group except for the first base station.

[0247] In practice, the terminal sends a random access request to the first base station, which then assigns a user identifier to the terminal. The first base station then sends the assigned public user identifier to the terminal for use during serving cell handover within the base station set. In this embodiment, the first base station refers to the first base station in the base station set to establish a connection with the terminal.

[0248] As an optional implementation, this embodiment may also perform the following steps:

[0249] Send a connection release request to the base station where the current serving cell is located, which is used by the base station where the current serving cell is located to request the first base station to release the user identifier.

[0250] Optionally, the user identifier in this embodiment includes a cell identifier and a cell user identifier; wherein the cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal; the cell user identifier is the identifier assigned to the terminal by the serving cell of the first base station.

[0251] like Figure 13 As shown in the diagram, this embodiment provides a schematic of a public user identifier, where the user identifier includes a cell identifier and a cell user identifier. The cell identifier is used to indicate the identifier of the cell of the first base station that establishes a connection for the terminal when the terminal initially accesses or switches to the cell set. Within the cell set, each cell has a unique identifier, which can be configured to the base station where the cell is located through network management and / or operation and control. The cell user identifier is used to indicate the unique identifier assigned to the terminal by the first base station within the cell of the first base station. The cell user identifier is unique only within the cell of the first base station. Different first base stations may assign the same cell user identifier to different users. In this case, the cell identifier can be combined with the public user identifier to ensure that the public user identifier assigned to the terminal is unique within the cell set.

[0252] In practice, non-terrestrial networks have the characteristic of wide cell coverage, and their number of cells is relatively small compared to terrestrial cells. However, with the high-speed movement of base stations, even if the terminal does not move, the serving cell of the terminal will change. Using "cell" as the dimension for terminal identification management will directly lead to a large signaling process overhead. By introducing a common user identifier for the cell set, it is possible to better adapt to the characteristics of non-terrestrial networks, transforming the relatively changing terminal identifier within a cell into a relatively static common user identifier for the cell set. This reduces the impact of the high dynamism of the base station on terminal connection management and terminal context maintenance, and can further reduce control plane interaction signaling.

[0253] In some embodiments, the terminal receives a user identifier sent by a first base station, where the first base station represents the first base station to establish a connection for the terminal; and / or, triggers a handover to a target serving cell, and the terminal sends the user identifier to the target serving cell.

[0254] Optionally, in this embodiment, the cell identifier is used to instruct the first base station in the cell set to release the user identifier. In practice, in addition to identifying the terminal, the cell identifier in this embodiment is also used by the base station of the target serving cell to notify the first base station to release the user identifier.

[0255] In implementation, this embodiment provides user identifier (C-UEID) management within the cell set. C-UEID management specifically includes: C-UEID allocation, C-UEID notification, and C-UEID release. C-UEID allocation refers to the process where the first base station assigns a common user identifier to the terminal when a connection is established for the first time. C-UEID notification refers to the process where the serving cell notifies the terminal of its C-UEID during initial access, or when the terminal changes its serving cell within the cell set, and the terminal with a C-UEID actively reports its C-UEID to the current serving cell. C-UEID release refers to the network releasing the C-UEID when the RRC connection is released, so that it can be used for subsequent terminal C-UEID allocation.

[0256] In this embodiment, user identifier management mainly includes the following process:

[0257] Procedure 1) The first base station that receives the terminal's random access request within the cell set, i.e., the first base station, assigns a user identifier (C-UEID) to the terminal. The first part of the C-UEID is the cell identifier, and the second part is the cell user identifier that the first base station assigns to the terminal, which is unique within the cell of the first base station.

[0258] Process 2) The first base station sends the C-UEID to the terminal as the terminal's public user identifier within the cell set.

[0259] (Step 3) When a handover occurs in a cell serving the terminal within the cell set, the terminal sends the common user identifier in the uplink data to the new serving cell (i.e., the cell being handed over).

[0260] Step 4) When the terminal releases the connection, the currently serving cell determines the source base station that allocated the user identifier through the cell identifier in the public user identifier, and sends the user identifier release message to the source base station.

[0261] Step 5) After receiving the user identifier release information, the source base station releases the user identifier.

[0262] like Figure 14 As shown in the figure, this embodiment also provides a user identifier management process, as detailed below:

[0263] Step 1400: The terminal sends a random access request to the first base station where the first cell in the cell set is located;

[0264] The cell set includes cell A, cell B, and cell C; the first base station is the first base station to receive the terminal's random access request, and the first cell is cell A.

[0265] Step 1401: The first base station assigns a user identifier to the terminal;

[0266] Step 1402: The first base station sends the user identifier to the terminal;

[0267] Step 1403: The terminal notifies other cells in the cell set of the received user identifier;

[0268] The terminal notifies its public user identifier to both cell B and cell C.

[0269] Step 1404: The terminal sends an RRC connection release request to the base station where cell C is located;

[0270] Step 1405: The base station where cell C is located sends an RRC link release message to the terminal;

[0271] Step 1406: The base station where cell C is located sends a public user identifier release message to the first base station;

[0272] Step 1407: The first base station releases the public user identifier.

[0273] This embodiment ensures that each terminal within a cell set has a unique public user identifier (C-UEID), reducing signaling interactions between terminals. On the other hand, the public user identifier can carry information about the cell that allocated the C-UEID. By adopting a strategy of "whoever allocates it releases it," the problem of C-UEID being exhausted during network operation is avoided, thus improving the robustness of the system.

[0274] This embodiment, by introducing the definition of base station groups, can fully utilize the predictable characteristics of non-terrestrial network serving cells and predictable changes in serving cells, thereby reducing the number of handovers, reducing the number of signaling messages corresponding to changes in serving cells, reducing signaling interactions and signaling plane latency caused by changes in serving cells, improving handover efficiency, and further enhancing the continuity of terminal services.

[0275] Based on the same inventive concept, embodiments of the present invention also provide a network switching method, applied to network-side devices, such as... Figure 15 As shown, the specific implementation process of this method is as follows:

[0276] Step 1500: Determine the handover command configuration of the terminal and instruct it to the terminal. The handover command configuration includes the RRC connection configuration information of the base station group multiplexing.

[0277] Step 1501: The terminal initiates a cell handover using the reused RRC connection configuration information.

[0278] As an optional implementation, determining the terminal's handover command configuration includes:

[0279] Based on the terminal location and ephemeris information, the switching command configuration of the terminal is determined.

[0280] As an optional implementation, the switching command configuration further includes any one or more of the following:

[0281] The service order of each serving cell in the base station group;

[0282] The service time of each serving cell in the base station group;

[0283] The time to switch to each serving cell in the base station group.

[0284] Optionally, in this embodiment, the base stations in the base station group correspond to one or more serving cells.

[0285] In practice, the base station group in this embodiment has the following characteristics:

[0286] Feature 1: In this embodiment, any two base stations in the base station group have a transmission link, which is used to transmit configuration information multiplexed between the two base stations.

[0287] In practice, taking a base station group including SCBS as an example, there is an inter-satellite link between any two base stations within SCBS, which means that there is an inter-station interface between any two base stations within SCBS.

[0288] Optionally, the configuration information in this embodiment includes, but is not limited to, UE context, session connection configuration, RRC connection configuration information, and user identifier reused among base stations. Through the transmission link between any two base stations in the base station group, configuration information such as UE context, session connection configuration, RRC connection configuration, and user identifier can be reused between any two base stations in the base station group, thereby reducing the overhead of air interface signaling within the base station group.

[0289] Feature 2: In order to further reduce the number of handovers, when the terminal is about to switch to a base station group, the network-side device configures the handover command to the terminal. This handover command configuration includes the configuration information of the base station group where the target serving cell is located, determined according to the ephemeris information.

[0290] Optionally, the handover command configuration in this embodiment includes, but is not limited to, one or more of the following: RRC connection configuration information reused between different base stations, service order of serving cells in the base station group, service time of serving cells in the base station group, time to handover to serving cells in the base station group, reserved resources of different base stations in the base station group, and user identifiers reused between different base stations in the base station group.

[0291] Feature 3: The terminal has common RRC connection configuration information and a common user identifier within the base station group. The terminal can calculate the uplink TA (Timing Advance) value according to the ephemeris and report it to the network through pre-reserved common resources or dedicated resources within the base station group configured for the UE. After the network confirms receipt of the TA value, it considers the RRC connection between the terminal and the target cell of the first base station in the base station group to be successfully established, and at the same time notifies the source cell to release the RRC connection of the terminal.

[0292] Feature 4: Handover between base stations and terminals within a base station group is achieved through pre-set base station groups and their shared configurations and common C-RNTI (Cell Radio Network Temporary Identifier). The base station group configuration is at the UE level; UEs in different geographical locations can be configured with different base station groups. Optionally, base station groups can be configured based on the UE's geographical location and mobility characteristics (e.g., path planning).

[0293] As an optional implementation, determining the terminal's handover command configuration and instructing it to the terminal includes:

[0294] Receive a request message sent by the terminal, and send a response message to the terminal, the response message carrying the handover command configuration; or,

[0295] An RRC reconfiguration message is sent to the terminal, the RRC reconfiguration message carrying the handover command configuration.

[0296] As an optional implementation, the request message carries the information of whether the terminal has the capability to access the serving cell in the base station group; the request message includes any one or more of the following:

[0297] Switching requests;

[0298] RRC establishment request;

[0299] RRC setup complete message;

[0300] System message.

[0301] As an optional implementation, a designated base station in the base station group receives the handover request sent by the terminal. The designated base station refers to the base station in the base station group that is the first serving cell to serve the terminal according to the service order. The designated base station sends a response message to the terminal, and the response message carries the handover command configuration.

[0302] As an optional implementation, the handover command configuration further includes reserved resources for the base station group; wherein, the reserved resources of the base station group include reserved resources of different base stations in the base station group, and one or more base stations in the base station group can provide reserved resources for the terminal to send uplink data for uplink data synchronization. The specific implementation process is as follows:

[0303] The receiving terminal transmits uplink data using the reserved resources of the base station where the target serving cell is located;

[0304] A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

[0305] As an optional implementation, the handover command configuration further includes the user identifier reused by the base station group; the method further includes:

[0306] The receiving terminal sends uplink data and the user identifier;

[0307] A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

[0308] As an optional implementation method,

[0309] The user identifier includes the cell identifier and the cell user identifier;

[0310] The cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal;

[0311] The cell user identifier is an identifier assigned to the terminal by the serving cell of the first base station.

[0312] As an optional implementation method,

[0313] There is a transmission link between any two base stations in the base station group, and the transmission link is used to transmit configuration information multiplexed between the two base stations.

[0314] Based on the same inventive concept, embodiments of the present invention also provide a network switching method, applied to network-side devices, such as... Figure 16 As shown, the specific implementation process of this method is as follows:

[0315] Step 1600: Determine the user identifier that the terminal reuses in the base station group and indicate it to the terminal;

[0316] Step 1601: The terminal initiates a cell handover using uplink data carrying the user identifier.

[0317] As an optional implementation, this embodiment also performs the following process:

[0318] The user identifier that the terminal reuses among different base stations in the base station group is determined based on the first base station in the base station group and indicated to the terminal.

[0319] The first base station refers to the first base station in the base station group that establishes a connection with the terminal.

[0320] As an optional implementation, this embodiment also performs the following process:

[0321] Receive connection release request sent by the terminal;

[0322] The connection release request is forwarded to the first base station to instruct the first base station to release the user identifier.

[0323] Based on the same inventive concept, this embodiment of the invention also provides a terminal. Since this terminal is the same as the terminal in the method of this embodiment of the invention, and the principle of the terminal in solving the problem is similar to that of the method, the implementation of the terminal can refer to the implementation of the method, and the repeated parts will not be described again.

[0324] like Figure 17 As shown, the terminal includes a processor 1700 and a memory 1701. The memory 1701 is used to store programs executable by the processor 1700. The processor 1700 is used to read the programs in the memory 1701 and perform the following steps:

[0325] Trigger condition switching;

[0326] Based on the handover command configuration indicated by the base station group, and utilizing the RRC connection configuration information reused by the base station group, a cell handover is performed to the target serving cell in the base station group.

[0327] As an optional implementation, the handover command configuration includes the service order of the serving cells in the base station group; the processor 1700 is further configured to execute:

[0328] The target serving cell is determined based on the service order of the serving cells in the base station group.

[0329] As an optional implementation, the processor 1700 is specifically configured to perform:

[0330] If the source base station is a base station outside the base station group, the target serving cell is determined to be the serving cell ranked first in the service order; or...

[0331] If the source base station is a base station within the base station group, the target serving cell is determined to be the next serving cell in the service sequence.

[0332] As an optional implementation, the handover command configuration includes the service time of the serving cell in the base station group, and / or the time for handover to the serving cell in the base station group; the processor 1700 is further configured to execute:

[0333] The target serving cell is determined based on the service time of the serving cell in the base station group and / or the time of handover to the serving cell in the base station group.

[0334] As an optional implementation, the processor 1700 is further configured to perform:

[0335] Send a request message to the base station group, and receive a response message from the base station group, the response message carrying the handover command configuration; or,

[0336] The system receives an RRC reconfiguration message sent by the base station group, the RRC reconfiguration message carrying the handover command configuration.

[0337] As an optional implementation, the request message carries the information of whether the terminal has the capability to access the serving cell in the base station group; the request message includes any one or more of the following:

[0338] Switching requests;

[0339] RRC establishment request;

[0340] RRC establishment complete message;

[0341] System message.

[0342] As an optional implementation, the processor 1700 is specifically configured to perform:

[0343] Send a handover request to a designated base station in the base station group, where the designated base station is the base station of the serving cell that first serves the terminal in the service order of the base station group.

[0344] Receive a response message sent by the designated base station, the response message carrying the handover command configuration.

[0345] As an optional implementation, the handover command configuration includes reserved resources for the base station group; the processor 1700 is further configured to execute:

[0346] Uplink data is sent to the base station where the target serving cell is located using the reserved resources of the base station where the target serving cell is located;

[0347] Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

[0348] As an optional implementation, the handover command configuration includes the user identifier multiplexed by the base station group; the processor 1700 is further configured to execute:

[0349] If the source base station is a base station within the base station group, send uplink data and the user identifier to the base station where the target serving cell is located;

[0350] Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

[0351] As an optional implementation method,

[0352] The user identifier includes the cell identifier and the cell user identifier;

[0353] The cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal;

[0354] The cell user identifier is an identifier assigned to the terminal by the serving cell of the first base station.

[0355] Based on the same inventive concept, this embodiment of the invention also provides a network-side device. Since this network-side device is the same as the network-side device in the method of this embodiment of the invention, and the principle of solving the problem by this network-side device is similar to that of this method, the implementation of this network-side device can refer to the implementation of the method, and the repeated parts will not be described again.

[0356] like Figure 18 As shown, the network-side device includes a processor 1800 and a memory 1801. The memory 1801 is used to store programs executable by the processor 1800. The processor 1800 is used to read the programs in the memory 1801 and perform the following steps:

[0357] The handover command configuration of the terminal is determined and indicated to the terminal, wherein the handover command configuration includes the RRC connection configuration information of the base station group multiplexing;

[0358] The terminal initiates cell handover using reused RRC connection configuration information.

[0359] As an optional implementation, the processor 1800 is specifically configured to perform:

[0360] Based on the terminal location and ephemeris information, the switching command configuration of the terminal is determined.

[0361] As an optional implementation, the switching command configuration further includes any one or more of the following:

[0362] The service order of each serving cell in the base station group;

[0363] The service time of each serving cell in the base station group;

[0364] The time to switch to each serving cell in the base station group.

[0365] As an optional implementation, the processor 1800 is specifically configured to perform:

[0366] Receive a request message sent by the terminal, and send a response message to the terminal, the response message carrying the handover command configuration; or,

[0367] An RRC reconfiguration message is sent to the terminal, the RRC reconfiguration message carrying the handover command configuration.

[0368] As an optional implementation, the request message carries the information of whether the terminal has the capability to access the serving cell in the base station group; the request message includes any one or more of the following:

[0369] Switching requests;

[0370] RRC establishment request;

[0371] RRC setup complete message;

[0372] System message.

[0373] As an optional implementation, the processor 1800 is further configured to perform:

[0374] The designated base station in the base station group receives the handover request sent by the terminal. The designated base station refers to the base station in the base station group that is the first serving cell to serve the terminal according to the service order.

[0375] The designated base station sends a response message to the terminal, and the response message carries the handover command configuration.

[0376] As an optional implementation, the handover command configuration also includes reserved resources for the base station group; the processor 1800 is further configured to execute:

[0377] The receiving terminal transmits uplink data using the reserved resources of the base station where the target serving cell is located;

[0378] A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

[0379] As an optional implementation, the handover command configuration further includes the user identifier multiplexed by the base station group; the processor 1800 is specifically configured to execute:

[0380] The receiving terminal sends uplink data and the user identifier;

[0381] A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

[0382] As an optional implementation method,

[0383] The user identifier includes the cell identifier and the cell user identifier;

[0384] The cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal;

[0385] The cell user identifier is an identifier assigned to the terminal by the serving cell of the first base station.

[0386] As an optional implementation method,

[0387] There is a transmission link between any two base stations in the base station group, and the transmission link is used to transmit configuration information multiplexed between the two base stations.

[0388] Based on the same inventive concept, embodiments of the present invention also provide a network switching device, such as... Figure 19 As shown, the device includes:

[0389] Trigger switching module 1900 is used to trigger condition switching;

[0390] The handover execution module 1901 is configured to perform cell handover to the target serving cell in the base station group according to the handover command configuration indicated by the base station group and using the RRC connection configuration information reused by the base station group.

[0391] Based on the same inventive concept, embodiments of the present invention also provide a network switching device, such as... Figure 20 As shown, the device includes:

[0392] The handover configuration module 2000 is used to determine the handover command configuration of the terminal and instruct it to the terminal. The handover command configuration includes RRC connection configuration information for base station group multiplexing.

[0393] The handover execution module 2001 is used to execute cell handover initiated by the terminal using multiplexed RRC connection configuration information.

[0394] Based on the same inventive concept, this embodiment of the invention also provides a terminal. Since this terminal is the same as the terminal in the method of this embodiment of the invention, and the principle of the terminal in solving the problem is similar to that of the method, the implementation of the terminal can refer to the implementation of the method, and the repeated parts will not be described again.

[0395] like Figure 21 As shown, the terminal includes a processor 2100 and a memory 2101. The memory 2101 is used to store programs executable by the processor 2100. The processor 2100 is used to read the programs in the memory 2101 and perform the following steps:

[0396] Trigger a cell handover to the target serving cell in the base station group, where the target serving cell refers to the serving cell in the base station group that will soon serve the terminal.

[0397] Using uplink data carrying a user identifier, a cell handover is performed to the target serving cell; the user identifier represents the user identifier reused by the base station group.

[0398] Based on the same inventive concept, this embodiment of the invention also provides a network-side device. Since this network-side device is the same as the network-side device in the method of this embodiment of the invention, and the principle of solving the problem by this network-side device is similar to that of this method, the implementation of this network-side device can refer to the implementation of the method, and the repeated parts will not be described again.

[0399] like Figure 22 As shown, the terminal includes a processor 2200 and a memory 2201. The memory 2201 is used to store programs executable by the processor 2200. The processor 2200 is used to read the programs in the memory 2201 and perform the following steps:

[0400] Determine the user identifier that the terminal reuses in the base station group and indicate it to the terminal;

[0401] The terminal initiates a cell handover using uplink data carrying the user identifier.

[0402] Based on the same inventive concept, this disclosure provides a computer storage medium comprising: computer program code, which, when executed on a computer, causes the computer to perform any of the network switching methods described above. Since the principle by which the computer storage medium solves the problem is similar to that of the network switching method, the implementation of the computer storage medium can be referred to the implementation of the method, and repeated details will not be elaborated further.

[0403] In specific implementation, computer storage media can include: Universal Serial Bus Flash Drive (USB), portable hard drive, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disk or optical disk, and other storage media that can store program code.

[0404] Based on the same inventive concept, this disclosure also provides a computer program product, which includes computer program code that, when executed on a computer, causes the computer to perform any of the network switching methods discussed above. Since the principle by which the above-described computer program product solves the problem is similar to that of the network switching method, the implementation of the above-described computer program product can be referred to the implementation of the method, and repeated details will not be elaborated further.

[0405] Computer program products may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0406] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0407] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 program instructions. These computer program 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 Devices that specify the functions in one or more boxes.

[0408] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction device, which is implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0409] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment 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.

[0410] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A network handover method, characterized in that, Applied to a terminal, the method includes: Trigger condition switching; Based on the handover command configuration indicated by the base station group, and utilizing the RRC connection configuration information reused by the base station group, a cell handover is performed to the target serving cell in the base station group.

2. The method according to claim 1, characterized in that, The handover command configuration includes the service order of the serving cells in the base station group; the method further includes: The target serving cell is determined based on the service order of the serving cells in the base station group.

3. The method according to claim 2, characterized in that, Determining the target serving cell based on the service order of the serving cells in the base station group includes: If the source base station is a base station outside the base station group, the target serving cell is determined to be the serving cell ranked first in the service order; or... If the source base station is a base station within the base station group, the target serving cell is determined to be the next serving cell in the service sequence.

4. The method according to claim 1, characterized in that, The handover command configuration includes the service time of the serving cell in the base station group, and / or the time for handover to the serving cell in the base station group; The method also includes: The target serving cell is determined based on the service time of the serving cell in the base station group and / or the time of handover to the serving cell in the base station group.

5. The method according to claim 1, characterized in that, The method also includes: Send a request message to the base station group, and receive a response message from the base station group, the response message carrying the handover command configuration; or, The system receives an RRC reconfiguration message sent by the base station group, the RRC reconfiguration message carrying the handover command configuration.

6. The method according to claim 5, characterized in that, The request message carries whether the terminal has the capability to access the serving cell in the base station group; the request message includes any one or more of the following: Switching requests; RRC establishment request; RRC establishment complete message; System message.

7. The method according to claim 5, characterized in that, Sending a request message to the base station group and receiving a response message from the base station group, including: Send a handover request to a designated base station in the base station group, where the designated base station is the base station of the serving cell that first serves the terminal in the service order of the base station group. Receive a response message sent by the designated base station, the response message carrying the handover command configuration.

8. The method according to claim 1, characterized in that, The handover command configuration includes the reserved resources of the base station group; performing a cell handover to the target serving cell in the base station group includes: Uplink data is sent to the base station where the target serving cell is located using the reserved resources of the base station where the target serving cell is located; Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

9. The method according to claim 1, characterized in that, The handover command configuration includes the user identifier reused by the base station group; performing a cell handover to the target serving cell in the base station group includes: If the source base station is a base station within the base station group, send uplink data and the user identifier to the base station where the target serving cell is located; Upon receiving a confirmation message from the base station where the target serving cell is located that it has successfully received the uplink data, the system determines to switch to the target serving cell.

10. The method according to claim 9, characterized in that, The user identifier includes the cell identifier and the cell user identifier; The cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal; The cell user identifier is an identifier assigned to the terminal by the serving cell of the first base station.

11. A network handover method, characterized in that, Applied to network-side devices, the method includes: The handover command configuration of the terminal is determined and indicated to the terminal, wherein the handover command configuration includes the RRC connection configuration information of the base station group multiplexing; The terminal initiates cell handover using reused RRC connection configuration information.

12. The method according to claim 11, characterized in that, Determine the terminal's handover command configuration, including: Based on the terminal location and ephemeris information, the switching command configuration of the terminal is determined.

13. The method according to claim 11, characterized in that, The switching command configuration also includes any one or more of the following: The service order of each serving cell in the base station group; The service time of each serving cell in the base station group; The time to switch to each serving cell in the base station group.

14. The method according to claim 11, characterized in that, Determine the terminal's handover command configuration and instruct it to the terminal, including: Receive a request message sent by the terminal, and send a response message to the terminal, the response message carrying the handover command configuration; or, An RRC reconfiguration message is sent to the terminal, the RRC reconfiguration message carrying the handover command configuration.

15. The method according to claim 14, characterized in that, The request message carries whether the terminal has the capability to access the serving cell in the base station group; the request message includes any one or more of the following: Switching requests; RRC establishment request; RRC setup complete message; System message.

16. The method according to claim 14, characterized in that, Receiving a request message sent by the terminal and sending a response message to the terminal, including: The designated base station in the base station group receives the handover request sent by the terminal. The designated base station refers to the base station in the base station group that is the first serving cell to serve the terminal according to the service order. The designated base station sends a response message to the terminal, and the response message carries the handover command configuration.

17. The method according to claim 11, characterized in that, The handover command configuration also includes reserved resources for the base station group; the method further includes: The receiving terminal transmits uplink data using the reserved resources of the base station where the target serving cell is located; A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

18. The method according to claim 11, characterized in that, The handover command configuration also includes the user identifier reused by the base station group; the method further includes: The receiving terminal sends uplink data and the user identifier; A confirmation message is sent to the terminal to acknowledge successful receipt of the uplink data, which is used to notify the terminal that the cell handover was successful.

19. The method according to claim 18, characterized in that, The user identifier includes the cell identifier and the cell user identifier; The cell identifier is the identifier of the serving cell of the first base station in the base station group, and the first base station represents the first base station in the base station group to establish a connection with the terminal; The cell user identifier is an identifier assigned to the terminal by the serving cell of the first base station.

20. The method according to any one of claims 11 to 19, characterized in that, There is a transmission link between any two base stations in the base station group, and the transmission link is used to transmit configuration information multiplexed between the two base stations.

21. A network handover method, characterized in that, Applied to a terminal, the method includes: Trigger a cell handover to the target serving cell in the base station group, where the target serving cell refers to the serving cell in the base station group that will soon serve the terminal. Using uplink data carrying a user identifier, a cell handover is performed to the target serving cell; the user identifier represents the user identifier reused by the base station group.

22. The method according to claim 21, characterized in that, The method also includes: Send an access request to the first base station in the base station group, where the first base station represents the first base station in the base station group to establish a connection with the terminal. Receive the user identifier sent by the first base station; The user identifier is sent to all base stations in the base station group except for the first base station.

23. The method according to claim 22, characterized in that, The method also includes: Send a connection release request to the base station where the current serving cell is located, which is used by the base station where the current serving cell is located to request the first base station to release the user identifier.

24. A network handover method, characterized in that, Applied to network-side devices, the method includes: Determine the user identifier that the terminal reuses in the base station group and indicate it to the terminal; The terminal initiates a cell handover using uplink data carrying the user identifier.

25. The method according to claim 24, characterized in that, The method also includes: The user identifier that the terminal reuses in the base station group is determined based on the first base station in the base station group and indicated to the terminal; the first base station refers to the first base station in the base station group that establishes a connection with the terminal.

26. The method according to claim 25, characterized in that, The method also includes: Receive connection release request sent by the terminal; The connection release request is forwarded to the first base station to instruct the first base station to release the user identifier.

27. A terminal, characterized in that, The terminal includes a processor and a memory, the memory being used to store a program executable by the processor, and the processor being used to read the program in the memory and execute the steps of any of the methods described in claims 1-10 and 21-23.

28. A network-side device, characterized in that, It includes a processor and a memory, the memory being used to store a program executable by the processor, and the processor being used to read the program in the memory and execute the steps of the method according to any one of claims 11-20, 24-26.

29. A non-transient computer storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1 to 26.

Images