Transmission switching method, terminal and network side device

Abstract

The present application discloses a transmission switching method, a terminal, and a network side device belonging to the wireless communication technical field. The transmission switching method of an embodiment of the present application includes a step of a source base station sending a first instruction to a network side device, the network side device including a target base station and / or a core network function, wherein the first instruction is used to request the terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This invention claims priority to a Chinese patent application submitted to the China Patent Office on April 14, 2021, bearing application number 202110400020.8 and titled "Transmission switching method, terminal and network side equipment," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of wireless communication technology, and particularly to a transmission switching method, a terminal, and a network side device. [Background technology]

[0003] Fifth generation (5G) New Radio (NR) technology can support a variety of different types or characteristics of services. Here, we take the Local Multimedia Broadcast and Multicast Service (Local MBS) as an example. This Local MBS service provides groupcast or broadcast communication services that can only be used by terminals located within a local service area. In this case, research is needed to determine how to prevent a terminal from obtaining services that are only available in the local service area when the terminal leaves the local service area. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a transmission switching method, a terminal, and a network side device that can prevent a terminal from obtaining services that are only provided in a local service area after the terminal leaves the local service area. [Means for solving the problem]

[0005] According to a first aspect, there is provided a transmission switching method performed by a source base station, the method comprising: sending a first instruction to a network side device, the network side device comprising a target base station and / or a core network function, wherein the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction comprises business information of a first service for determining whether the target base station is located or not located in a service area corresponding to the first service.

[0006] According to a second aspect, there is provided a method for transmission switching performed by a target base station, the method including a step of receiving a first instruction sent by a source base station, wherein the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located or not located in a service area corresponding to the first service.

[0007] According to a third aspect, there is provided a method for transmission switching performed by a core network function, the method including at least one of the following steps: receiving a first instruction sent by a source base station, the first instruction used to request a terminal to switch from the source base station to a target base station, the first instruction including business information of the first service for determining whether the target base station is located in a service area corresponding to the first service; receiving a third instruction sent by the target base station, the third instruction used to indicate that the terminal does not belong to a service group corresponding to a first service, the third instruction being sent when the target base station receives the first instruction sent by the source base station and the target base station is not located in a service area corresponding to the first service; and receiving a path switch request sent by the target base station and, if a second condition is satisfied, sending a fourth instruction to the target base station, wherein the fourth instruction is used to indicate at least one of that the path switch corresponding to the first service has failed and that the terminal does not belong to a service group corresponding to the first service.

[0008] According to a fourth aspect, there is provided a method for transmission switching performed by a terminal, the method including at least one of the following steps: receiving an RRC reconfiguration message sent by a source base station, the RRC reconfiguration message being sent by the source base station after the source base station has sent a first instruction to a network side device, the first instruction being used to request the terminal to switch from the source base station to a target base station, the first instruction including business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not, the network side device including a target base station and / or a core network function; receiving a fifth instruction sent by the source base station, the fifth instruction being sent when the source base station has determined that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; and receiving an NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0009] According to a fifth aspect, there is provided a transmission switching device, the device including: a first sending module for sending a first instruction to a target base station and / or a network side device including a core network function, wherein the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction includes business information of a first service for determining whether the target base station is located or not located in a service area corresponding to the first service.

[0010] According to a sixth aspect, there is provided a transmission switching apparatus, the apparatus including: a first receiving module for receiving a first instruction sent by a source base station, wherein the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction includes business information of a first service for determining whether the target base station is located or not located in a service area corresponding to the first service.

[0011] According to a seventh aspect, there is provided an apparatus for transmission switching, the apparatus including: a third receiving module for at least one of: receiving a first instruction sent by a source base station, the first instruction used to request a terminal to switch from the source base station to a target base station, the first instruction including service information of a first service for determining whether the target base station is located in a service area corresponding to the first service; receiving a third instruction sent by the target base station, the third instruction used to indicate that the terminal does not belong to a service group corresponding to a first service, the third instruction being sent when the target base station receives the first instruction sent by the source base station and the target base station is not located in a service area corresponding to the first service; receiving a path switching request sent by the target base station and, if a second condition is satisfied, sending a fourth instruction to the target base station, wherein the fourth instruction is used to indicate at least one of: that the path switching corresponding to the first service has failed; and that the terminal does not belong to a service group corresponding to the first service.

[0012] According to an eighth aspect, there is provided an apparatus for transmission switching, the apparatus including: a fourth receiving module for receiving an RRC reconfiguration message sent by a source base station, the RRC reconfiguration message being sent by the source base station after the source base station has sent a first instruction to a network side device, the first instruction being used to request the terminal to switch from the source base station to a target base station, the first instruction including service information of a first service for determining whether the target base station is located in a service area corresponding to the first service or not, the network side device including a target base station and / or a core network function; a fifth instruction sent by the source base station, the fifth instruction being sent when the source base station has determined that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; and receiving an NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0013] According to a ninth aspect, there is provided a terminal including a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of the fourth aspect.

[0014] According to a tenth aspect, there is provided a terminal, the terminal including a processor and a communication interface, wherein the communication interface is coupled to the processor, the processor being used to run a program or instruction, and capable of implementing the method of the fourth aspect.

[0015] According to an eleventh aspect, there is provided a network side device, the network side device including a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method according to the first aspect, or implementing the steps of the method according to the second aspect, or implementing the steps of the method according to the third aspect.

[0016] According to a twelfth aspect, there is provided a network side device, the network side device including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the method according to the first aspect, or to implement the steps of the method according to the second aspect, or to implement the steps of the method according to the third aspect.

[0017] According to a thirteenth aspect, there is provided a readable storage medium having a program or instructions stored thereon, which, when executed by a processor, performs the steps of the method according to the first aspect, or the steps of the method according to the second aspect, or the steps of the method according to the third aspect, or the steps of the method according to the fourth aspect.

[0018] According to a fourteenth aspect, there is provided a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor running a program or instruction to implement the steps of the method according to the first aspect, or to implement the steps of the method according to the second aspect, or to implement the steps of the method according to the third aspect, or to implement the steps of the method according to the fourth aspect.

[0019] According to a fifteenth aspect, there is provided a computer program product / program product, the computer program product / program product being stored on a non-volatile storage medium, the computer program product / program product being executable by at least one processor to implement the steps of the method according to the first aspect, or to implement the steps of the method according to the second aspect, or to implement the steps of the method according to the third aspect, or to implement the steps of the method according to the fourth aspect. [Effects of the Invention]

[0020] In an embodiment of the present application, the source base station sends a first instruction including business information of a first service, so that the target base station and / or core network function can determine whether the target base station is located in the service area corresponding to the first service based on the business information of the first service, and further effectively trigger the terminal to leave the service group corresponding to the first service when the terminal leaves the local service area corresponding to the first service, thereby preventing the terminal from acquiring this first service and ensuring wireless communication performance. [Brief explanation of the drawings]

[0021] [Figure 1a] 1 is a structural schematic diagram of a wireless communication system according to one exemplary embodiment of the present application; [Figure 1b] FIG. 2 is a schematic diagram of a transmission switching scenario according to one exemplary embodiment of the present application; [Figure 2] 3 is a flowchart of a transmission switching method according to one exemplary embodiment of the present application; [Figure 3] 4 is a flowchart of a transmission switching method according to another exemplary embodiment of the present application. [Figure 4] 4 is a flowchart of a transmission switching method according to another exemplary embodiment of the present application. [Figure 5] 4 is a flowchart of a transmission switching method according to another exemplary embodiment of the present application. [Figure 6] 4 is a flowchart of a transmission switching method according to another exemplary embodiment of the present application. [Figure 7] 4 is a flowchart of a transmission switching method according to another exemplary embodiment of the present application. [Figure 8] 1 is an interaction flowchart of a transmission switching method according to an exemplary embodiment of the present application; [Figure 9] 4 is an interaction flowchart of a transmission switching method according to another exemplary embodiment of the present application; [Figure 10] 1 is a block structure schematic diagram of a transmission switching device according to an exemplary embodiment of the present application; [Figure 11] FIG. 10 is a block structure schematic diagram of a transmission switching device according to another exemplary embodiment of the present application; [Figure 12] FIG. 10 is a block structure schematic diagram of a transmission switching device according to another exemplary embodiment of the present application; [Figure 13] FIG. 10 is a block structure schematic diagram of a transmission switching device according to another exemplary embodiment of the present application; [Figure 14] FIG. 2 is a block structure schematic diagram of a terminal according to one exemplary embodiment of the present application; [Figure 15] FIG. 2 is a block structure schematic diagram of a network-side device according to an exemplary embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0022] The following clearly describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application fall within the scope of protection of the present application.

[0023] The terms "first," "second," etc. in the specification and claims of this application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It should be understood that terms used in this manner are interchangeable where appropriate, so that embodiments of this application may be performed in orders other than those illustrated or described herein, and that objects distinguished by "first" and "second" are generally of the same type and do not limit the number of objects; for example, a first object may be one or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the related objects.

[0024] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be applied to other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are always used interchangeably, and the described techniques may be used in the above-mentioned systems and radio technologies as well as other systems and radio technologies. Although the following description describes an NR system for illustrative purposes and uses NR terminology in most of the following description, these techniques may be applied to applications other than NR system applications, such as sixth generation (6G) communication systems.

[0025] 1a shows a structural schematic diagram of a wireless communication system to which the embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. Here, the terminal 11 may be referred to as a terminal device or user equipment (UE), and may be a terminal-side device such as a mobile phone, a tablet personal computer (PDA), a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), a wearable device (WD), a vehicle-mounted equipment (VUE), a pedestrian-mounted equipment (PUE), etc., and wearable devices include smart watches, bracelets, earphones, glasses, etc. It should be noted that the specific type of the terminal 11 in the embodiments of the present application is not limited. The network side equipment 12 may be a base station or a core network, where the base station may be called a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting receiving point (TRP), or any other suitable term in the art, as long as the same technical effect is achieved. The base station is not limited to a specific technical term. For illustrative purposes, the embodiments of this application only take base stations in an NR system as examples, but do not limit the specific type of base station.

[0026] In addition, referring to Figure 1b in conjunction with the above, taking the Local MBS service in NR as an example, when a terminal leaves the service area corresponding to this Local MBS service, for example, when the terminal switches from a source base station located in the Local MBS service area to a target base station located outside the Local MBS service area, the embodiments of the present application provide a technical solution for determining whether the target base station is located in the service area corresponding to the Local MBS service or not, and for preventing the terminal from acquiring the Local MBS service in this Local MBS service area after leaving the Local MBS service area. Hereinafter, the technical solution according to the embodiments of the present application will be described in detail with reference to several embodiments and their application scenarios in conjunction with the drawings.

[0027] 2, which is a flowchart of a transmission switching method 200 according to an exemplary embodiment of the present application, which may be performed by, but is not limited to, a source base station, specifically, by hardware and / or software installed in the source base station. In this embodiment, the method 200 may include at least the following steps:

[0028] S210: Send a first instruction to the network side device.

[0029] Here, according to a handover scenario, the network side device includes a target base station (e.g., gNB) and / or a core network function, for example, for an N2 handover scenario, the network side device may include a core network function, and for an XN handover scenario, the network side device may include a target base station, where the core network function may be, but is not limited to, an Access and Mobility Management Function (AMF), such as an AMF with reinforced and MBS capabilities (MB-AMF).

[0030] The first instruction is used to request the terminal to switch from the source base station to the target base station, and the first instruction may include business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

[0031] The first service means that for vehicle-to-everything (V2X), public security and other services provided locally, there may be at least one of groupcast or broadcast communication services, such as Local MBS and MBS, that are available only in local service areas (e.g., per cellular, Timing Advance (TA) or other geographical measurements) and at specific times (e.g., event times, emergency times or operating hours).

[0032] In this embodiment, the first instruction may be understood as a switch request instruction, for example, according to a communication scenario, the first instruction may be a handover required message in an N2 switch scenario or a handover request message in an XN switch scenario. In one implementation, the source base station configures a terminal measurement process based on information related to roaming and access restriction included in the terminal context information, the terminal sends a measurement report based on the measurement configuration, and the source base station makes a decision on a transmission switch of the terminal based on the received measurement report and radio resource management (RRM) information. If a switch is required, the source base station sends a switch request instruction, and if not, does not send a switch instruction.

[0033] It should be noted that the source base station and the target base station may be conventional base stations or enhanced base stations. The difference between the conventional base station and the enhanced base station is that the enhanced base station is a network device with MBMS (or MBS) capability, i.e., can transmit MBMS (or MBS) data via a core network part in a shared delivery manner, whereas the conventional base station, i.e., a network device without MBMS (or MBS) capability, can only transmit MBMS or MBS in a protocol data unit session (PDU session) manner (or in an individual delivery manner via a core network part). Based on this, the actual types of the source base station and the target base station may be determined according to an actual communication scenario and are not limited herein.

[0034] In this embodiment, the source base station sends a first instruction including business information of a first service, so that the target base station and / or core network function can determine whether the target base station is located in the service area corresponding to the first service based on the business information of the first service, and further effectively trigger the terminal to leave the service group corresponding to the first service when the terminal leaves the local service area corresponding to the first service, thereby preventing the terminal from acquiring this first service and ensuring the characteristics of the first service, such as Local MBS.

[0035] 3, there is shown a flowchart of a transmission switching method 300 according to an exemplary embodiment of the present application, which may be performed by, but is not limited to, a source base station, specifically, by hardware and / or software installed in the source base station. In this embodiment, the method 300 may include at least the following steps:

[0036] S310: The source base station determines whether the target base station is located in the service area corresponding to the first service or not. If not, execute S320; if yes, execute S330.

[0037] S320, sending a first instruction to the network side device.

[0038] It can be understood that the implementation process of S320 can be referred to the relevant description in the method embodiment 200, and will not be further described here to avoid repetition.

[0039] S330, performing a first predetermined operation.

[0040] As can be understood from the description of the enhanced base station and the conventional base station in embodiment 200 of the above method, in this embodiment, if the source base station is a conventional base station, the source base station cannot determine whether the target base station is located in the service area corresponding to the first service, and in this case, the source base station performs the step of sending a first instruction to the network side equipment as described in S320, so that the network side equipment determines whether the target base station is located in the service area corresponding to the first service based on this first instruction.

[0041] If the source base station is an enhanced base station and the source base station determines that the target base station is not located in the service area corresponding to the first service, perform the first predetermined operation described in S330 to ensure that the transmission switching is performed smoothly.

[0042] Here, the first predetermined operation includes at least one of the following (1) to (3).

[0043] (1) Deciding not to transmit the first instruction to the network side device.

[0044] (2) The task information of the first task included in the first instruction is removed.

[0045] As can be understood from the above (1) to (2), considering that the source base station can determine whether the target base station is located in the service area corresponding to the first service or not, in order to improve network performance and reduce network overhead, the source base station does not need to send a first instruction, or only sends a first instruction that does not include service information of the first service to the network side device to instruct it to perform switching.

[0046] (3) Send a fifth instruction to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service, which may be, but is not limited to, a multicast service group corresponding to an MBS service.

[0047] In this embodiment, the source base station determines the flow of whether to trigger the terminal to leave the service group corresponding to the first service based on whether the source base station can determine whether the target base station is located in the service area corresponding to the first service, thereby further improving the flexibility of the transmission switching process and ensuring the characteristics of the first service such as Local MBS.

[0048] 4, there is shown a flowchart of a transmission switching method 400 according to an exemplary embodiment of the present application, which may be performed by, but is not limited to, a target base station, specifically, by hardware and / or software installed in the target base station. In this embodiment, the method 400 may include at least the following steps:

[0049] S410, receiving a first instruction sent by a source base station.

[0050] Here, the first instruction is used to request the terminal to switch from the source base station to the target base station, and the first instruction includes service information of the first service for determining whether the target base station is located in a service area corresponding to the first service. Optionally, the first service includes at least one of a Local MBS and an MBS.

[0051] It can be understood that the implementation process of S410 can be referred to the relevant descriptions in the above method embodiments 200 to 300, and will not be further described here to avoid repetition.

[0052] In this embodiment, based on the fact that the target base station is a conventional base station or an enhanced base station, the target base station can determine whether the target base station is located in the service area corresponding to the first service based on the service information of the first service included in the first instruction, and by transferring the service information of the first service to other network side equipment (e.g., a core network function), the other network side equipment can determine whether the target base station is located in the service area corresponding to the first service, thereby ensuring that the transmission switching is performed smoothly and that the terminal can be removed from the service group corresponding to the first service.

[0053] In addition, in this embodiment, the target base station not only receives a first instruction including business information of the first business, but also, if the source base station can determine whether the target base station is located in the business area corresponding to the first business or not, the first instruction received by the target base station may not include business information of the first business, and this embodiment does not limit this.

[0054] In this embodiment, the target base station receives a first instruction including business information of a first service, and the target base station and / or core network function can determine whether the target base station is located in the service area corresponding to the first service based on the business information of the first service, and further effectively trigger the terminal to leave the service group corresponding to the first service when the terminal leaves the local service area corresponding to the first service, thereby preventing the terminal from acquiring this first service and ensuring the characteristics of the first service, such as Local MBS.

[0055] 5, there is shown a flowchart of a transmission switching method 500 according to an exemplary embodiment of the present application, which may be performed by, but is not limited to, a target base station, specifically, by hardware and / or software installed in the target base station. In this embodiment, the method 500 may include at least the following steps:

[0056] S510, receiving a first instruction sent by a source base station.

[0057] Here, the first instruction is used to request the terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

[0058] It can be understood that the implementation process of S510 can refer to the relevant descriptions in embodiments 200 to 400 of the above method. In addition, a possible implementation method is that if the target base station is an enhanced base station, the target base station performs the following S520; if the target base station is a conventional base station, the target base station performs the following S530. For the specific implementation process, refer to the descriptions of S520 and S530.

[0059] S520, if it is determined that the target base station is not located in a service area corresponding to the first service, perform a second predetermined operation.

[0060] Here, the second predetermined operation includes at least one of the following (1) and (2).

[0061] (1) Reject the switching of the first service (which may be understood as the switching not being successful) and / or send a second instruction to the source base station to indicate that the terminal does not belong to the service group corresponding to the first service.

[0062] Here, taking an XN handover scenario as an example, after receiving the first instruction, if the target base station can determine based on the first instruction that the target base station is not located in a service area corresponding to the first service and the target base station rejects the handover of the terminal, the target base station can send a HANDOVER PREPARATION FAILURE message (i.e., a second instruction) to the source base station, where the HANDOVER PREPARATION FAILURE message may further carry a message that the terminal does not belong to a service group corresponding to the first service.

[0063] On the other hand, if the target base station, after receiving the first instruction, can determine based on the first instruction that the target base station is not located in the service area corresponding to the first service, and accepts the terminal to switch to this base station, the target base station can instruct the source base station by a second instruction that the terminal does not belong to the service group corresponding to the first service.

[0064] (2) Sending a third instruction to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0065] As can be seen, by performing the second predetermined operation, the target base station, the source base station, and the core network function can all have a unified understanding that the terminal is not located in a business area corresponding to the first business, thereby ensuring wireless communication performance.

[0066] S530, if it has not been determined or it is determined that the target base station is located in or not located in a service area corresponding to the first service, sending a path switch request (PATH SWITCH REQUEST message) to a core network function.

[0067] Here, the path switching request carries business information of the first business, whereby the core network function determines whether or not the target base station is located in the business area corresponding to the first business based on the business information of the first business, thereby triggering or not triggering the terminal to leave the service group corresponding to the first business.

[0068] Furthermore, as a possible implementation manner, in addition to the aforementioned source base station or target base station determining whether the target base station is located in the service area corresponding to the first service, if the terminal can determine whether the target base station is located in the service area corresponding to the first service, when the terminal determines that the target base station is not located in the service area corresponding to the first service, it can send a Radio Resource Control (RRC) message to the target base station, and based on this, when the target base station receives the RRC message sent by the terminal, it performs at least one of the following (1) to (2) based on the RRC message:

[0069] (1) If the RRC message instructs the target base station to release resources corresponding to the first service, release resources corresponding to the first service.

[0070] (2) If the RRC message indicates that the terminal does not belong to a service group corresponding to the first service, an N2 message is sent to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0071] Here, upon receiving the RRC message, the target base station can ensure that the terminal is removed from the service group corresponding to the first service, and can also ensure consistency of understanding between the target base station and the core network function, and avoid resource waste.

[0072] In this embodiment, the target base station determines whether to trigger the terminal to leave the service group corresponding to the first service based on whether the target base station can determine whether the target base station is located in the service area corresponding to the first service, thereby further improving the flexibility of the transmission switching process and ensuring the characteristics of the first service such as Local MBS.

[0073] 6, a flowchart of a transmission switching method 600 according to an exemplary embodiment of the present application, which may be performed by, but is not limited to, a core network function, specifically, by hardware and / or software installed in the core network function. In this embodiment, according to a switching scenario, the method 600 may include at least one of the following steps S610 to S630:

[0074] S610, receiving a first instruction sent by a source base station.

[0075] Here, the first instruction is used to request the terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

[0076] In this embodiment, the implementation process of S610 may refer to the relevant descriptions in embodiments 200-500 of the above method. In addition, a possible implementation is as follows: for an N2 handover scenario, when the source base station cannot determine whether the target base station is located in the service area corresponding to the first service, the source base station sends a first instruction to the core network function, the first instruction including service information of the first service. In this case, the core network function can determine whether the target base station is located in the service area corresponding to the first service based on the received first instruction. If the target base station determines that the target base station is not located in the service area corresponding to the first service, the core network function sends a Non Access Stratum (NAS) message to the terminal to trigger the terminal to leave the service group corresponding to the first service. Here, the NAS message is used to indicate that the terminal does not belong to the service group corresponding to the first service, ensuring smooth transmission handover.

[0077] In addition, if the core network function rejects the switching of the terminal (i.e., the switching is not successful), the core network function can further reject the switching of the first service by including the PDU session identifier (session ID) of the first service in the PDU Session Resources to Release List IE of the HANDOVER COMMAND message.

[0078] Another possible implementation method is, for an N2 switching scenario, if the source base station can determine whether the target base station is located in a service area corresponding to the first service or not, the source base station sends a first instruction to the core network function, which does not include service information of the first service, so that the core network function and the source base station have a unified understanding of the switching of the terminal and can ensure wireless communication performance.

[0079] As can be seen from the above, the transmission switching scheme provided by S610 is implemented in the N2 switching scenario, thereby ensuring that the transmission switching in the N2 switching scenario is performed smoothly.

[0080] S620, receiving a third instruction sent by the target base station.

[0081] Here, the third instruction is used to indicate that the terminal does not belong to a service group corresponding to a first service, and the third instruction is sent when the target base station receives the first instruction sent by the source base station and the target base station is not located in a service area corresponding to the first service.

[0082] In this embodiment, the implementation process of S620 refers to the relevant descriptions in embodiments 200 to 500 of the above-mentioned method, and as a possible implementation manner, for an XN switching scenario, if the target base station can determine that the target base station is not located in the service area corresponding to the first service, the target base station can send a third instruction to the core network function, so that the core network function determines that the terminal does not belong to the service group corresponding to the first service, and sends or does not send a NAS message to the terminal to indicate that the terminal does not belong to the service group corresponding to the first service.

[0083] As can be understood, whether or not the core network function sends an NAS message to the terminal may be determined by a protocol or configured by a higher layer, and is not limited thereto.

[0084] S630, receiving a path switch request sent by the target base station, and sending a fourth instruction to the target base station if a second condition is met.

[0085] In this embodiment, the implementation process of S630, in addition to referring to the relevant descriptions in embodiments 200 to 500 of the above-mentioned method, as a possible implementation manner, for an XN switching scenario, regardless of whether the target base station can determine whether the target base station is located in the service area corresponding to the first service, the target base station will send a path switching request to the core network function, and if the second condition is met, the core network function will determine whether the target base station is located in the service area corresponding to the first service, and send a fourth instruction to the target base station.

[0086] Optionally, the second condition includes at least one of the following (1) and (2):

[0087] (1) The route switching request includes the task information of the first task.

[0088] (2) The target base station is not located in a service area corresponding to the first service.

[0089] The fourth instruction is used to indicate at least one of the following (1) to (2):

[0090] (1) The route switching corresponding to the first task has failed (it may be understood that the route switching corresponding to the first task is not permitted).

[0091] (2) The terminal does not belong to a service group corresponding to the first service.

[0092] As can be seen from the above, the transmission switching schemes given in S620 and S630 are implemented in the XN switching scenario, thereby ensuring that the transmission switching in the XN switching scenario is performed smoothly.

[0093] It should also be noted that the core network functions provided in this embodiment may be used only in the N2 switching scenario (e.g., executing S610), only in the XN switching scenario (e.g., executing S620 and / or S630), or simultaneously in the N2 switching scenario and the XN switching scenario, and are not limited thereto.

[0094] Optionally, in the above implementation, the first service includes at least one of a Local MBS and an MBS.

[0095] In this embodiment, the core network function determines whether to trigger the terminal to leave the service group corresponding to the first service by determining whether the target base station is located in the service area corresponding to the first service, thereby further improving the flexibility of the transmission switching process and ensuring the characteristics of the first service such as Local MBS.

[0096] 7, there is shown a flowchart of a transmission switching method 700 according to an exemplary embodiment of the present application, which may be performed by a terminal, but is not limited thereto, and may specifically be performed by hardware and / or software installed in the terminal. In this embodiment, the method 700 may include at least one of the following steps S710 to S730:

[0097] S710, receiving an RRC reconfiguration message sent by a source base station.

[0098] Here, the RRC reconfiguration message is sent after the source base station sends a first instruction to a network side device, the first instruction is used to request the terminal to switch from the source base station to a target base station, the first instruction includes business information of a first service for determining whether the target base station is located in a service area corresponding to the first service or not, and the network side device includes a target base station and / or a core network function.

[0099] In this embodiment, as a possible implementation method, if the terminal determines based on the RRC reconfiguration message that the target base station is not located in a service area corresponding to the first service, it performs a third predetermined operation, including at least one of the following (1) to (2):

[0100] (1) Send a NAS message to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service (for example, the terminal initiates a session leave process).

[0101] (2) Transmit an RRC message used for one of the following (2a) to (2b) to the target base station.

[0102] (2a) Instruct the target base station to release resources corresponding to the first service.

[0103] (2b) Indicate that the terminal does not belong to the service group corresponding to the first service.

[0104] It can be understood that the implementation process of S710 can refer to the relevant descriptions in embodiments 200 to 600 of the above-mentioned method, and in addition, in the transmission switching method given in this embodiment S710, the terminal ensures that the target base station is located or not located in the service area corresponding to the first service, thereby triggering the terminal to leave the service group corresponding to the first service, thereby preventing the terminal from acquiring this first service and ensuring the characteristics of the first service such as Local MBS.

[0105] In addition, the terminal further sends an NAS message and an RRC message to ensure that the network side equipment and the terminal have a unified understanding that the target base station is not located in the service area corresponding to the first service, thereby ensuring that the transmission switching is carried out smoothly.

[0106] S720: Receive a fifth instruction sent by the source base station, where the fifth instruction is sent when the source base station determines that the target base station is not located in a service area corresponding to the first service, and the fifth instruction is used to indicate that the terminal does not belong to a service group corresponding to the first service.

[0107] Here, in S720, the fifth instruction is sent to the terminal when the source base station determines that the target base station is not located in a service area corresponding to the first service, and by instructing the terminal that it does not belong to a service group corresponding to the first service, it ensures that transmission switching is carried out smoothly.

[0108] S730, receiving a NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0109] Here, in S730, the NAS message is sent to the terminal when the core network function determines that the target base station is not located in a service area corresponding to the first service, and ensures that transmission switching is performed smoothly by indicating that the terminal does not belong to a service group corresponding to the first service.

[0110] Optionally, in the above implementation, the first service includes at least one of a Local MBS and an MBS.

[0111] It can also be understood that the transmission switching schemes in S710 to S730 given in this embodiment can be used in an N2 switching scenario or an XN switching scenario, and are not limited thereto.

[0112] In this embodiment, the terminal determines whether to trigger the terminal to leave the service group corresponding to the first service by determining whether the target base station is located in the service area corresponding to the first service, thereby further improving the flexibility of the transmission switching process and ensuring the characteristics of the first service, such as Local MBS.

[0113] Furthermore, based on the description of the above method embodiments 200-700, the transmission switching flow in the N2 switching scenario and the XN switching scenario will be further described below in conjunction with FIG. 8 and FIG. 9, as follows:

[0114] (1) XN switching scenario With reference to FIG. 8 in conjunction, in an XN switching scenario, a transmission switching flow 800 may include, but is not limited to, the following processes:

[0115] S801: When the source base station cannot determine whether the target base station is located in a service area corresponding to a first service or not, it sends a first instruction to the target base station, the first instruction including service information of the first service.

[0116] S802, sending a first instruction to a target base station, the first instruction including service information of a first service, and then sending an RRC reconfiguration message to the terminal.

[0117] S803: If the target base station receives the first instruction but cannot determine whether the target base station is located in a service area corresponding to the first service or not, send a path switching request to a core network function.

[0118] S804: if the target base station receives the first instruction and determines that the target base station is not located in a service area corresponding to a first service, perform a second predetermined operation.

[0119] S805: If the core network function receives the path switching request and determines that the target base station is not located in a service area corresponding to the first service, send a fourth instruction to the target base station.

[0120] S806, if the terminal receives an RRC reconfiguration message and determines that the target base station is not located in a service area corresponding to the first service, perform a third predetermined operation.

[0121] S807: if the source base station determines that the target base station is not located in a service area corresponding to the first service, perform a first predetermined operation.

[0122] (2) N2 switching scenario With reference in conjunction with FIG. 9, in an N2 switching scenario, a transmission switching flow 900 may include processes such as the following.

[0123] S901: When the source base station cannot determine whether the target base station is located in a service area corresponding to a first service or not, it sends a first instruction to a core network function, the first instruction including service information of the first service.

[0124] S902, sending a first instruction to a target base station, the first instruction including service information of a first service, and then sending an RRC reconfiguration message to the terminal.

[0125] S903, if the core network function receives the first instruction and determines that the target base station is not located in a service area corresponding to the first service, sending a NAS message to the terminal.

[0126] S904, if the terminal receives an RRC reconfiguration message and determines that the target base station is not located in a service area corresponding to a first service, perform a third predetermined operation.

[0127] S905, if the source base station determines that the target base station is not located in a service area corresponding to the first service, perform a first predetermined operation.

[0128] It should be noted that the implementation processes of the above S801 to S807 and S901 to S905 can be referred to the relevant descriptions in the above method embodiments 200 to 700, and will not be further described here to avoid repetition. In addition, the transmission switching flow from 800 to 900 may include more or fewer steps than those described above, and is not limited here.

[0129] As shown in Figure 10, this is a block structure schematic diagram of a transmission switching device 1000 according to one exemplary embodiment of the present application, which includes a first sending module 1010 for sending a first instruction to a target base station and / or a network side device including a core network function, where the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

[0130] Optionally, the first sending module 1010 is used to perform the step of sending the first instruction to the target base station when the source base station has not determined whether the target base station is located or not in the service area corresponding to the first service.

[0131] Optionally, the first sending module 1010 is further used to perform at least one of the following when the source base station determines that the target base station is not located in a service area corresponding to the first service: deciding not to send the first instruction to the network side equipment; removing service information of the first service included in the first instruction; and sending a fifth instruction to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

[0132] Optionally, the source base station is an enhanced base station.

[0133] Optionally, the first service includes at least one of a Local MBS and an MBS.

[0134] As shown in Figure 11, this is a block structure schematic diagram of a transmission switching device 1100 according to one exemplary embodiment of the present application, which includes a first receiving module 1110 for receiving a first instruction sent by a source base station, where the first instruction is used to request a terminal to switch from the source base station to the target base station, and the first instruction includes business information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not.

[0135] Optionally, the apparatus 1100 further includes a second receiving module 1120 for performing at least one of rejecting switching of the first service and / or sending a second instruction to the source base station to indicate that the terminal does not belong to a service group corresponding to the first service, and sending a third instruction to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service, when it determines that the target base station is not located in a service area corresponding to the first service.

[0136] Optionally, the apparatus 1100 further includes a second sending module 1130 for sending a path switching request, in which business information of the first business is carried, to a core network function.

[0137] Optionally, the target base station is an enhanced base station.

[0138] Optionally, the first service includes at least one of a Local MBS and an MBS.

[0139] Optionally, the first receiving module 1110 is further used to perform at least one of the following when receiving an RRC message sent by the terminal: based on the RRC message, if the RRC message instructs the target base station to release resources corresponding to the first service, releasing resources corresponding to the first service; and if the RRC message indicates that the terminal does not belong to a service group corresponding to the first service, sending an N2 message to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0140] As shown in FIG. 12, it is a block structure schematic diagram of a transmission switching device 1200 according to an exemplary embodiment of the present application, the transmission switching device 1200 includes the steps of: receiving a first instruction sent by a source base station, the first instruction is used to request a terminal to switch from the source base station to a target base station, the first instruction includes service information of the first service for determining whether the target base station is located in a service area corresponding to the first service or not; and receiving a third instruction sent by the target base station, the third instruction is used to indicate that the terminal does not belong to a service group corresponding to the first service. and a third receiving module 1210 for receiving a path switching request sent by the target base station and, if a second condition is satisfied, sending a fourth instruction to the target base station, wherein the fourth instruction is used to indicate at least one of that the path switching corresponding to the first service has failed and that the terminal does not belong to a service group corresponding to the first service.

[0141] Optionally, the apparatus 1200 further includes a third sending module 1220 for sending an NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service when it determines that the target base station is not located in a service area corresponding to the first service.

[0142] Optionally, the apparatus 1200 further includes a fourth sending module 1230 for sending or not sending a NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

[0143] Optionally, the second condition includes at least one of the following: the path switching request includes business information of the first business; and the target base station is not located in a business area corresponding to the first business.

[0144] Optionally, the first service includes at least one of a Local MBS and an MBS.

[0145] As shown in FIG. 13, it is a block structure schematic diagram of a transmission switching device 1300 according to an exemplary embodiment of the present application, the transmission switching device 1300 receiving an RRC reconfiguration message sent by a source base station, the RRC reconfiguration message being sent after the source base station sends a first instruction to a network side device, the first instruction being used to request the terminal to switch from the source base station to a target base station, the first instruction including business information of a first service for determining whether the target base station is located in a service area corresponding to the first service or not, and the network side device receiving the RRC reconfiguration message; a fourth receiving module 1310 used for at least one of: receiving a fifth instruction sent by the source base station, the fifth instruction being sent when the source base station determines that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; and receiving an NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0146] Optionally, when it is determined based on the RRC reconfiguration message that the target base station is not located in a service area corresponding to the first service, the fourth receiving module 1310 is further used to perform at least one of: sending an NAS message to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service; instructing the target base station to release resources corresponding to the first service; and sending an RRC message to the target base station to indicate that the terminal does not belong to a service group corresponding to the first service.

[0147] Optionally, the first service includes at least one of a Local MBS and an MBS.

[0148] It should be noted that in the transmission switching methods 200 to 900 according to the embodiments of the present application, the execution body may be a transmission switching device or a control module for executing the transmission switching method in the transmission switching device. In the embodiments of the present application, the transmission switching device according to the embodiments of the present application will be described by taking the execution of the transmission switching method by the transmission switching device as an example.

[0149] The transmission switching device in the embodiment of the present application may be a device, a device or electronic equipment having an operating system, or a component, integrated circuit, or chip in a terminal. The device or electronic equipment may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include, but is not limited to, the types of terminals 11 listed above. The non-mobile terminal may be, for example, a server, a network-attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, a self-service machine, etc., and the embodiment of the present application is not specifically limited thereto.

[0150] The transmission switching device according to the embodiment of the present application can realize each process realized by the method embodiments of Figures 2 to 9 and achieve the same technical effects, and will not be further described here to avoid repetition of description.

[0151] An embodiment of the present application further provides a terminal, including a processor and a communication interface, the communication interface being coupled to the processor, and the processor running a program or instruction to implement the method described in the above method embodiment 700. This terminal embodiment corresponds to the above terminal-side method embodiment, and the implementation processes and implementation methods of the above method embodiment can all be applied to this terminal embodiment, and the same technical effects can be achieved. Specifically, Figure 14 is a schematic diagram of the hardware structure of a terminal implementing the embodiment of the present application.

[0152] The terminal 1400 includes at least some components such as, but not limited to, a radio frequency unit 1401, a network module 1402, an audio output unit 1403, an input unit 1404, a sensor 1405, a display unit 1406, a user input unit 1407, an interface unit 1408, a memory 1409, and a processor 1410.

[0153] As will be understood by those skilled in the art, the terminal 1400 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 1410 by a power management system, thereby enabling the power management system to realize functions such as charge / discharge management and power consumption management. The terminal structure shown in Figure 14 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than those shown, or a combination of some components, or a different arrangement of components, which will not be further described here.

[0154] It should be understood that in the embodiment of the present application, the input unit 1404 may include a graphics processing unit (GPU) 14041 and a microphone 14042, and the graphics processor 14041 processes image data of still or video images captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 1406 may include a display panel 14061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1407 includes a touch panel 14071 and other input devices 14072. The touch panel 14071 is also called a touch screen. The touch panel 14071 may include two parts: a touch detection device and a touch controller. The other input devices 14072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and a control lever, which will not be further described herein.

[0155] In the embodiment of the present application, the radio frequency unit 1401 receives downlink data from the network side device, and then processes the data in the processor 1410, and transmits uplink data to the network side device. Generally, the radio frequency unit 1401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0156] The memory 1409 may be used to store software programs or instructions and various data. The memory 1409 may primarily include a program or instruction storage area and a data storage area, where the program or instruction storage area can store an operating system, an application program or instructions required for at least one function (e.g., audio playback function, image playback function, etc.), etc. The memory 1409 may include high-speed random access memory or nonvolatile memory, where the nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, the memory 1409 may be at least one magnetic disk memory device, flash memory device, or other nonvolatile solid-state memory device.

[0157] The processor 1410 may include one or more processing units. Optionally, the processor 1410 may integrate an application processor and a modem processor. Here, the application processor mainly processes an operating system, a user interface, and application programs or instructions, and the modem processor mainly processes wireless communication, such as a baseband processor. As can be appreciated, the modem processor does not have to be integrated into the processor 1410.

[0158] Here, the processor 1410 is used for at least one of receiving an RRC reconfiguration message sent by a source base station, the RRC reconfiguration message being sent by the source base station after the source base station has sent a first instruction to a network side device, the first instruction being used to request the terminal to switch from the source base station to a target base station, the first instruction including business information of a first service for determining whether the target base station is located in a service area corresponding to the first service or not, the network side device including a target base station and / or a core network function; receiving a fifth instruction sent by the source base station, the fifth instruction being sent when the source base station has determined that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; and receiving an NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

[0159] Optionally, when the processor 1410 determines based on the RRC reconfiguration message that the target base station is not located in a service area corresponding to the first service, it performs at least one of sending an NAS message to a core network function to indicate that the terminal does not belong to a service group corresponding to the first service, instructing the target base station to release resources corresponding to the first service, and sending an RRC message to the target base station used for one of indicating that the terminal does not belong to a service group corresponding to the first service.

[0160] Optionally, the first service includes at least one of a Local MBS and an MBS.

[0161] In this embodiment, the terminal determines, based on the received RRC reconfiguration message, whether the target base station is located in the service area corresponding to the first service or not, and when the terminal leaves the local service area corresponding to the first service, effectively triggers the terminal to leave the service group corresponding to the first service, thereby preventing the terminal from acquiring this first service and ensuring the characteristics of the first service, such as Local MBS.

[0162] An embodiment of the present application further provides a network-side device, including a processor and a communication interface, the communication interface being coupled to the processor, and the processor running programs or instructions to realize the methods described in the above-mentioned method embodiments 200 to 600. This embodiment of the network-side device corresponds to the above-mentioned method embodiments of the network-side device, and the implementation processes and realization methods of the above-mentioned method embodiments can all be applied to this embodiment of the network-side device, and the same technical effects can be achieved.

[0163] Specifically, an embodiment of the present application further provides a network side device. As shown in Fig. 15, the network side device 1500 includes an antenna 1501, a radio frequency device 1502, and a baseband device 1503. The antenna 1501 and the radio frequency device 1502 are connected to each other. In the uplink direction, the radio frequency device 1502 receives information through the antenna 1501 and transmits the received information to the baseband device 1503 for processing. In the downlink direction, the baseband device 1503 processes the information to be transmitted and transmits it to the radio frequency device 1502, and the radio frequency device 1502 processes the received information and then transmits it through the antenna 1501.

[0164] The above frequency band processing device may be located in a baseband device 1503, and the method performed by the network side equipment in the above embodiments may be implemented in the baseband device 1503, which includes a processor 1504 and a memory 1505.

[0165] The baseband device 1503 may include, for example, at least one baseband board, on which multiple chips are installed, and as shown in FIG. 15, one of the chips is, for example, a processor 1504, which is connected to a memory 1505, and calls a program in the memory 1505 to perform the operations of the network equipment shown in the above method embodiments.

[0166] The baseband device 1503 may further include a network interface 1506, which is used to exchange information with the radio frequency device 1502, and this interface is, for example, a common public radio interface (abbreviated as CPRI).

[0167] Specifically, the network side device of the embodiment of the present invention further includes instructions or programs stored in memory 1505 and capable of running on processor 1504, and processor 1504 can call the instructions or programs in memory 1505 to execute the methods performed by each module shown in Figures 10-12, and achieve the same technical effects, which will not be further described here to avoid repetition.

[0168] The embodiments of the present application further provide a readable storage medium, on which a program or instruction is stored, which, when executed by a processor, can realize each process of the above transmission switching method embodiments 200-700 and achieve the same technical effects. In order to avoid repetition, no further description will be given here.

[0169] The processor may be the processor in the terminal described in the above embodiment. The readable storage medium may include a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0170] The embodiments of the present application further provide a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor running a program or instruction of the network side device to implement each process of the embodiments of the transmission switching method, and can achieve the same technical effects. In order to avoid repetition, no further description will be given here.

[0171] It should be understood that the chips referred to in the embodiments of this application may be referred to as system level chips, system chips, chip systems, or system-on-chips.

[0172] An embodiment of the present application further provides a computer program product, which includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor, and when the program or instruction is executed by the processor, the process of the above-mentioned transmission switching method embodiment can be realized and the same technical effect can be achieved. In order to avoid repetition, no further description will be given here.

[0173] It should be noted that, in this specification, the terms "comprise," "include," "includes," or any other variations thereof are intended to cover the non-exclusive "comprise," whereby a process, method, article, or apparatus comprising a set of elements not only includes those elements, but also other elements not expressly listed or inherent in such process, method, article, or apparatus. Absent further limitations, an element defined by the phrase "comprises one of" does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising that element. It should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions in an essentially simultaneous manner or in the reverse order based on the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

[0174] As will be apparent to those skilled in the art from the above description of the embodiments, the methods of the above embodiments can be realized in the form of software and a necessary general-purpose hardware platform. Of course, they can also be realized in hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical proposal of the present application, in substance or in part contributing to the prior art, may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes a number of instructions for causing a terminal (which may be a mobile phone, computer, server, air conditioner, network device, etc.) to execute the methods described in each embodiment of the present application.

[0175] Although the embodiments of the present application have been described above in conjunction with the drawings, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not limiting. Those skilled in the art can take the teachings of the present application into account and implement many forms without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present application.

Claims

1. A method of transmission switching applied to a core network function, comprising: a step of receiving, by the core network function, a first instruction sent by a source base station, the first instruction being used to request a terminal to switch from the source base station to a target base station, the first instruction including business information of a first service for determining whether the target base station is located in a service area corresponding to a first service; a step in which the core network function receives a third instruction sent by the target base station, the third instruction being used to indicate that the terminal does not belong to a service group corresponding to a first service, and the third instruction being sent when the target base station receives the first instruction sent by the source base station and the target base station is not located in a service area corresponding to the first service; receiving, by the core network function, a path switch request sent by the target base station, and sending, if a second condition is satisfied, a fourth instruction to the target base station; Here, the fourth instruction is: A failure in route switching corresponding to the first task; the terminal does not belong to a service group corresponding to the first service.

2. After the step of the core network function receiving a first indication sent by the source base station, the method further comprises:

2. The method of claim 1, further comprising: when determining that the target base station is not located in a service area corresponding to the first service, the core network function sending a non-access stratum NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

3. After the step of the core network function receiving a third indication sent by the target base station, the method further comprises:

2. The method of claim 1, further comprising the step of: the core network function sending or not sending a NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

4. The second condition is: The route switching request includes task information of the first task; The method of claim 1 , comprising at least one of: the target base station not being located in a service area corresponding to the first service.

5. The method according to any one of claims 1 to 4, wherein the first service comprises at least one of a local multimedia broadcast multicast service (Local MBS) and an MBS.

6. A transmission switching method applied to a communication system including a terminal, a source base station, and a network side device, a step of receiving, by the terminal, a radio resource control (RRC) reconfiguration message transmitted by the source base station, the RRC reconfiguration message being transmitted after the source base station transmits a first instruction to the network side device, the first instruction being used to request the terminal to switch from the source base station to a target base station, the first instruction including business information of a first service for determining whether the target base station is located in a service area corresponding to a first service or not, the network side device including a target base station and / or a core network function; a step of receiving, by the terminal, a fifth instruction transmitted by the source base station, the fifth instruction being transmitted when the source base station determines that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; and a step of receiving, by the terminal, a non-access stratum NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service.

7. After the terminal receives an RRC reconfiguration message sent by the source base station, the method further comprises: If it is determined based on the RRC reconfiguration message that the target base station is not located in a service area corresponding to the first service, the terminal: sending a NAS message to the core network function to indicate that the terminal does not belong to a service group corresponding to the first service; instructing the target base station to release resources corresponding to the first service; and indicating to the target base station that the terminal does not belong to a service group corresponding to the first service.

8. The method according to claim 6 or 7, wherein the first service comprises at least one of a local multimedia broadcast multicast service (Local MBS) and an MBS.

9. A transmission switching device, comprising: receiving a first instruction sent by a source base station, the first instruction being used to request a terminal to switch from the source base station to a target base station, and the first instruction including service information of a first service for determining whether the target base station is located in a service area corresponding to a first service; receiving a third instruction transmitted by the target base station, the third instruction being used to indicate that the terminal does not belong to a service group corresponding to a first service, and the third instruction being transmitted when the target base station receives the first instruction transmitted by the source base station and the target base station is not located in a service area corresponding to the first service; a third transceiver module for receiving a path switch request sent by the target base station, and sending a fourth instruction to the target base station when a second condition is satisfied; Here, the fourth instruction is: A failure in route switching corresponding to the first task; a transmission switching device used to indicate at least one of: that the terminal does not belong to a service group corresponding to the first service;

10. The device comprises:

10. The apparatus of claim 9, further comprising: a third sending module for, when determining that the target base station is not located in a service area corresponding to the first service, sending a non-access stratum NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

11. The device comprises:

10. The apparatus of claim 9, further comprising a fourth sending module for sending or not sending a NAS message to the terminal to indicate that the terminal does not belong to a service group corresponding to the first service.

12. The second condition is: The route switching request includes task information of the first task; The apparatus of claim 9 , comprising at least one of: the target base station not being located in a service area corresponding to the first service.

13. 13. The apparatus according to claim 9, wherein the first service comprises at least one of a local multimedia broadcast multicast service (Local MBS) and an MBS.

14. A transmission switching device applied to a communication system including a terminal, a source base station, and a network side device, receiving a radio resource control (RRC) reconfiguration message sent by the source base station, the RRC reconfiguration message being sent after the source base station has sent a first instruction to the network side device, the first instruction being used to request a terminal to switch from the source base station to a target base station, the first instruction including business information of a first service for determining whether the target base station is located in a service area corresponding to a first service, and the network side device including a target base station and / or a core network function; receiving a fifth instruction transmitted by the source base station, the fifth instruction being transmitted when the source base station determines that the target base station is not located in a service area corresponding to the first service, and the fifth instruction being used to indicate that the terminal does not belong to a service group corresponding to the first service; a fourth receiving module used for receiving a non-access stratum NAS message sent by the core network function to indicate that the terminal does not belong to a service group corresponding to the first service;

15. The fourth receiving module further determines, based on the RRC reconfiguration message, that the target base station is not located in a service area corresponding to the first service; sending a NAS message to the core network function to indicate that the terminal does not belong to a service group corresponding to the first service; instructing the target base station to release resources corresponding to the first service; and instructing the terminal that the terminal does not belong to a service group corresponding to the first service. The apparatus of claim 14 , wherein the first service includes at least one of a local multimedia broadcast multicast service (Local MBS) and an MBS.

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