CN117354879A

CN117354879A - Handover method, core network device, computer device, and readable storage medium

Info

Publication number: CN117354879A
Application number: CN202311480616.9A
Authority: CN
Inventors: 张伦泳
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2023-11-08
Filing date: 2023-11-08
Publication date: 2024-01-05

Abstract

The invention discloses a switching method, core network equipment, computer equipment and a readable storage medium, and relates to the technical field of base communication. The handover method is applied to a core network device and includes receiving a first set from a source base station. It is determined whether the first set includes a first session. If the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises the second fragments. And if the second fragments exist, sending first indication information to the first base station. When the terminal is in the RRC_CONNECTED state, under the condition that the source base station needs to switch the terminal to the adjacent base station, not only according to the measurement report of the terminal to the adjacent standard base station and the wireless resource management information, but also considering the fragmentation condition of the PDU session of the terminal, the continuity of the online network game related session is ensured as much as possible, and meanwhile, the delay consistency of the online network game related session is ensured by adjusting the delay, so that the substantial loss to the user caused by the interruption of the online network game related session is avoided.

Description

Handover method, core network device, computer device, and readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a handover method, a core network device, a computer device, and a readable storage medium.

Background

If the terminal is in the rrc_connected state in the radio resource control CONNECTED mode, the terminal needs to be switched from the source base station to the target base station if the terminal is about to exceed the coverage area of the source base station due to movement, i.e. the source base station is about to be unable to continue to provide services for the terminal. In the mobility process of the control plane of the related art, the source base station needs to configure a measurement process of the terminal, so that the terminal performs wireless signal measurement on the neighboring base station of the source base station according to the measurement configuration and sends a measurement report to the source base station, and therefore the source base station can determine the target base station from the neighboring base station based on the measurement report and the wireless resource management information. After determining the target base station, the source base station sends a handover request to the target base station, where the handover request carries information about the session of the protocol data unit PDU (Protocol Data Unit ). And PDU session information includes fragmentation information, quality of service QoS (Quality of Service ) flow class, qoS configuration information. After receiving the switching request, the target base station performs access control check on the terminal and sends a switching request response to the source base station. After receiving the switching request response, the source base station instructs the terminal to switch to the target base station through Radio Resource Control (RRC) signaling. And the terminal receives the indication to complete time-frequency synchronization with the target base station and sends RRC signaling to the target base station to complete the switching.

As can be seen, the source base station does not consider the fragmentation of the terminal PDU session when determining the target base station. That is, if the target base station does not support a certain piece of fragmentation information subscribed by the terminal, the target base station will refuse to provide service for the PDU session corresponding to the certain piece of fragmentation information not supported by the target base station. At this time, if the terminal is handed over to the target base station, the PDU session corresponding to a certain piece of fragmentation information that is not supported by the target base station is interrupted because it is not supported by the target base station. If the source base station keeps the PDU session corresponding to the piece of information not supported by the target base station at the source base station side, the PDU session corresponding to the piece of information not supported by the target base station is interrupted as the terminal moves beyond the coverage area of the source base station, so that the user experience is affected. Particularly for online gaming services, substantial losses may be incurred to the user if online gaming-related sessions are interrupted.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: in the process of terminal moving, if base station switching occurs, under the condition that a target base station does not support any piece of information, the PDU session corresponding to the piece of information which is not supported by the target base station may be interrupted, and the user experience is reduced.

Aiming at the defects in the prior art, the following scheme is provided:

in a first aspect, the present invention provides a handover method, applied to a core network device, where the method includes: a first set is received from a source base station. It is determined whether the first set includes a first session. If the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises the second fragments. And if the second fragments exist, sending first indication information to the first base station. Wherein the first set is forwarded by the source base station to the core network device in response to receiving the first response information from the first base station. The first base station is one of the neighboring base stations of the source base station. The first response information is sent by the first base station to the source base station in response to receiving the first handover request information from the source base station. The first handover request information includes information of a slice corresponding to a protocol data unit PDU session currently established by the terminal. The first response information includes a first set. The first set includes an identification of the first base station, a shard identification that is not supported by the first base station in the shards corresponding to the current established PDU session, and a session identification that is not supported by the first base station in the shards corresponding to the current established PDU session. The terminal is a terminal corresponding to the first handover request. The source base station is the base station currently providing network services for the terminal. The first session accords with a first preset condition, the first preset condition comprises that other sessions related to the first session exist at a server side of the first session, the other sessions are identical to initial time parameters of the first session, the time parameters comprise a time delay parameter and a sending time delay, and the time delay parameter is the time delay of network transmission. The transmission delay is the waiting time before the server transmits data to the terminal. The second segment meets a second preset condition, which includes that the service quality parameters of the second segment except the time delay parameters meet the service quality requirements of the first segment. The first shard is a shard corresponding to the first session. The service quality parameters comprise a time delay parameter and a packet loss rate parameter, or comprise a time delay parameter and a bandwidth parameter, or comprise a time delay parameter, a packet loss rate parameter and a bandwidth parameter. The first indication information is used for indicating the first base station to provide service for the first session by using the second fragment.

Optionally, the method further comprises: and acquiring the time delay difference, and if the time delay difference is greater than 0, transmitting the time delay difference to the server so that the server acquires the updated time parameters of the first session and the updated time parameters of other sessions according to the time delay difference and a preset rule. The delay difference is the difference between the initial delay parameter of the second segment and the initial delay parameter of the first segment.

Optionally, the updated time parameter of the first session includes an updated time delay parameter of the first session, where the updated time delay parameter of the first session is a first time delay parameter of the first session, and the first time delay parameter of the first session is a sum of an initial time delay parameter and a time delay difference value of the first session. The updated time parameters of the other sessions include updated transmission delays of the other sessions, the updated transmission delays of the other sessions are first transmission delays of the other sessions, and the first transmission delays of the other sessions are the sum of initial transmission delays and delay differences of the other sessions.

Optionally, the updated time parameter of the first session further comprises an updated transmission delay of the first session. In response to the minimum value of the initial transmission delay of the first session and the first transmission delays of the other sessions being other than 0, the updated transmission delay of the first session is the first transmission delay of the first session and the updated transmission delays of the other sessions are the second transmission delays of the other sessions. The first transmission delay of the first session is the difference between the initial transmission delay of the first session and the minimum value, and the second transmission delay of the other sessions is the difference between the first transmission delay of the other sessions and the minimum value.

Optionally, the method further comprises: a first handoff duration is received from a source base station. And forwarding the first switching duration to the server, so that the server waits for the updated transmission delay of the first session and then transmits data to the terminal, and waits for the updated transmission delay of other sessions and then transmits data to the other sessions respectively after waiting for the first switching duration and then waiting for the updated transmission delay of the other sessions. The first switching duration is a duration required by the terminal to switch from the source base station to the first base station.

Optionally, the method further comprises: and receiving notification information from the first base station, wherein the notification information is used for notifying the core network equipment that the service quality parameters of the first session are recovered. The notification information is sent by the first base station in response to switching the terminal to the second base station and in case the second base station supports the first fragmentation. The second base station is one of the neighboring base stations of the first base station. And sending second indication information to the server in response to receiving the notification information. The second indication information is used for indicating the server to restore the delay parameter of the first session to the initial delay parameter of the first session, and/or restore the transmission delay of the first session to the initial transmission delay of the first session, and restore the delay parameter of other sessions to the initial delay parameter of other sessions, and/or restore the transmission delay of other sessions to the initial transmission delay of other sessions.

Optionally, the method further comprises: a second handoff duration is received from the first base station. The second switching duration is a duration required by the terminal to switch from the first base station to the second base station. And forwarding the second switching duration to the server, so that the server waits for the initial transmission delay of the first session and then transmits data to the terminal after waiting for the second switching duration, and waits for the initial transmission delay of other sessions and then transmits data to other sessions respectively after waiting for the initial transmission delay of the second switching duration.

In a second aspect, the present invention provides a core network device, including a first set receiving module, a first session judging module, a second fragment judging module and a first indication information sending module. The first set receiving module is configured to: a first set is received from a source base station. The first set is forwarded by the source base station to the core network device in response to receiving the first response information from the first base station. The first base station is one of the neighboring base stations of the source base station. The first response information is sent by the first base station to the source base station in response to receiving the first handover request information from the source base station. The first handover request information includes information of a slice corresponding to a protocol data unit PDU session currently established by the terminal. The first response information includes a first set. The first set includes an identifier of the first base station, a fragment identifier that is not supported by the first base station in the fragments corresponding to the current established PDU session, and a session identifier that is not supported by the first base station in the fragments corresponding to the current established PDU session. The terminal is a terminal corresponding to the first handover request. The source base station is the base station currently providing network services for the terminal. The first session judgment module is configured to: judging whether the first set comprises a first session or not, wherein the first session meets a first preset condition, the first preset condition comprises that other sessions related to the first session exist at a server side of the first session, the other sessions are identical to time parameters of the first session, the time parameters comprise a time delay parameter and a sending time delay, and the time delay parameter is the time delay of network transmission. The transmission delay is the waiting time before the server transmits data to the terminal. The second segment judgment module is set as follows: if the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises the second fragments. The second segment meets a second preset condition, which includes that the service quality parameters of the second segment except the time delay parameters meet the service quality requirements of the first segment. The first shard is a shard corresponding to the first session. The service quality parameters comprise a time delay parameter and a packet loss rate parameter, or a time delay parameter and a bandwidth parameter, or a time delay parameter, a packet loss rate parameter and a loan parameter. The first indication information sending module is set as follows: and if the second fragments exist, sending first indication information to the first base station. The first indication information is used for indicating the first base station to provide service for the first session by using the second fragment.

In a third aspect, the present invention provides a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor performing the above-described handover method when the processor runs the computer program stored in the memory.

In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the above-described handover method.

The switching method, the core network device, the computer device and the readable storage medium provided by the invention have the beneficial effects that: when the terminal is in the RRC_CONNECTED state, under the condition that the source base station needs to switch the terminal to the adjacent base station, not only according to the measurement report of the terminal to the adjacent base station and the wireless resource management information, but also considering the fragmentation condition of the PDU session of the terminal, the continuity of the online network game related session is ensured as much as possible, and meanwhile, the delay consistency of the online network game related session is ensured by adjusting the delay, so that the substantial loss to the user caused by the interruption of the online network game related session is avoided, and better network service is provided for the user.

Drawings

Fig. 1 is a schematic diagram of an application scenario of a switching method in an embodiment of the present invention;

FIG. 2 is a flow chart of a switching method according to an embodiment of the invention;

FIG. 3 is a flowchart of another switching method according to an embodiment of the present invention;

FIG. 4 is a flowchart of another method for switching according to an embodiment of the present invention;

FIG. 5 is a flowchart of another switching method according to an embodiment of the present invention;

FIG. 6 is a flowchart of another switching method according to an embodiment of the present invention;

FIG. 7 is a flowchart of another switching method according to an embodiment of the present invention;

fig. 8 is a block diagram of a core network device according to an embodiment of the present invention;

fig. 9 is a block diagram of another core network device according to an embodiment of the present invention;

fig. 10 is a block diagram of a core network device according to still another embodiment of the present invention;

fig. 11 is a block diagram of a core network device according to another embodiment of the present invention;

fig. 12 is a block diagram of a core network device according to still another embodiment of the present invention;

fig. 13 is a block diagram of a computer device according to an embodiment of the present invention.

Detailed Description

In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.

It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.

It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.

It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.

It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.

It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.

It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.

It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.

Some embodiments of the present invention provide a handover method, which may be applied in the scenario shown in fig. 1, where as shown in fig. 1, the base station 10 is a base station that currently provides network services for the terminal 20 of the user. Base stations 11, 12, 13 are adjacent to the coverage area of base station 10, respectively. That is, when the base station 10 is a source base station, the base stations 11, 12, and 13 are adjacent base stations to the source base station, respectively. The terminal 20 may move away from the base station 10 and enter the coverage of the base station 11, or the base station 12, or the base station 13 as the user moves, during which a handover of the base station providing network services for the terminal 20 will occur. The core network device 30 is connected to the base station 10, the base station 11, the base station 12, and the base station 13, respectively, and the core network device 30 can perform information interaction with the base station 10, the base station 11, the base station 12, and the base station 13, respectively.

It will be appreciated that in fig. 1, the terminal 20 may be any form of mobile smart device, such as a vehicle-mounted terminal, a smart phone, and embodiments of the present invention are not limited to the form of the terminal 20.

Some embodiments of the present invention provide a handover method applied to a core network device, as shown in fig. 2, where the method includes steps 201 to 204.

Step 201, a first set is received from a source base station.

In step 201, the first set is forwarded by the source base station to the core network device in response to receiving the first response information from the first base station. The first base station is one of the neighboring base stations of the source base station. The first response information is sent by the first base station to the source base station in response to receiving the first handover request information from the source base station. The first handover request information includes information of a slice corresponding to a protocol data unit PDU session currently established by the terminal. The first response information includes a first set. The first set includes an identification of the first base station, a shard identification that is not supported by the first base station in the shards corresponding to the current established PDU session, and a session identification that is not supported by the first base station in the shards corresponding to the current established PDU session. The terminal is a terminal corresponding to the first handover request. The source base station is the base station currently providing network services for the terminal.

In some embodiments, as shown in fig. 3, before step 201, the interaction between the source base station, the terminal and the first base station may further comprise steps 205 to 207.

Step 205, the source base station performs measurement configuration for the terminal and sends a measurement instruction to the terminal.

In step 205, the measurement instruction is used to instruct the terminal to perform wireless signal measurement according to the measurement configuration and send the measurement result to the source base station.

It can be understood that when the source base station performs measurement configuration for the terminal, the terminal may be designated to perform radio signal measurement on one base station (such as the first base station) in the neighboring base stations, if the measurement result meets the handover requirement, it is determined that the one base station is the target base station (i.e. the first base station) to perform handover, and if not, it is designated to re-measure the one base station. The source base station may also designate the terminal to measure a plurality of base stations among the neighboring base stations, and determine a target base station (i.e., the first base station) among the plurality of base stations according to the measurement result.

Illustratively, as shown in fig. 1, the base station 10 recognizes that the terminal 20 is about to go beyond the coverage area of the base station 10 as the user moves, the source base station may instruct the terminal 20 to make wireless signal measurements on neighboring base stations of the source base station (e.g., one or more of the base stations 11, 12, 13).

Step 206, the source base station receives the measurement result from the terminal, and determines the first base station in the neighboring base stations of the source base station based on the measurement result and the radio resource management information.

Illustratively, after performing radio signal measurements on the base station 11, the base station 12, and the base station 13, the terminal 20 transmits the results of performing radio signal measurements on the base station 11, the base station 12, and the base station 13, respectively, to the neighboring base stations of the base station 10, that is, transmits the measurement results to the base station 10. After receiving the measurement result, the base station 10 may select a base station with the best measurement result (i.e., the best signal) from the measurement results as the first base station. For example, if the measurement result is the best result of the terminal performing radio signal measurement on the base station 11, the first base station may be determined to be the base station 11.

Step 207, the source base station sends first handover request information to the first base station, so that the first base station sends first response information to the source base station.

In step 207, the first handover request information includes information of a PDU session that the terminal has currently established. The information of the PDU session currently established by the terminal includes the fragment information corresponding to the PDU session currently established by the terminal, the quality of service QoS flow class corresponding to the PDU session currently established by the terminal, and QoS configuration information corresponding to the PDU session currently established by the terminal. Thus, the first base station can receive the first switching request information from the source base station, and send out the first response information according to the fragmented information corresponding to the PDU session carried in the first switching request information.

For example, the base station 10 sends first handover request information to the base station 11, after the base station 11 receives the first handover request information, acquires the piece of information corresponding to the PDU session currently established by the terminal carried in the first handover request information, and confirms whether there is a piece of information not supported by the base station 11, if so, the base station 11 can acquire the piece of information not supported by the base station 11 in the piece of information corresponding to the PDU session currently established by the terminal carried in the first handover request information. It may be understood that, the first set may include not only the information of the fragments that are not supported by the base station 11 in the information of the fragments corresponding to the PDU session currently established by the terminal carried in the first handover request information, but also the identifier of the base station 11 and the session identifier corresponding to the fragments that are not supported by the base station 11 in the fragments corresponding to the PDU session currently established.

It will be appreciated that the first response information may comprise the first set, or may comprise other information that is needed to interact with the source base station or core network device. After receiving the first response information from the first base station, the source base station may send only the first set included in the first response information to the core network device, or may send the first response information to the core network device, and acquire the first set from the first response information.

Step 202, determining whether the first set includes a first session.

In step 202, the first session meets a first preset condition, where the first preset condition includes that the server side of the first session has other sessions related to the first session, and the other sessions are the same as the initial time parameters of the first session, the time parameters include a delay parameter and a transmission delay, and the delay parameter is a delay of network transmission. The transmission delay is the waiting time before the server transmits data to the terminal. It can be understood that the server in this embodiment refers to the server of the first session and other sessions.

It may be understood that the delay parameter of the first session refers to the maximum transmission delay guaranteed for the first session when the network provides the service, that is, the duration of time required for the data to be sent from the server to reach the terminal of the first session may be equal to or less than the delay parameter of the first session. The sending delay of the first session, that is, when the server sends data to the terminal of the first session, the action of sending data to the terminal is completed within the range of the delay parameter of the first session after waiting for the sending delay of the first data.

It will be appreciated that if there are other sessions associated with the first session at the server, these sessions require the same time parameters in order to ensure a consistent business experience on the terminal side of the first session and the other sessions (e.g., networked gamers).

Step 203, if the first session exists, searching the first base station according to the identifier of the first base station and inquiring whether the first base station includes the second fragment.

In step 203, the second slice meets a second preset condition, where the second preset condition includes that a quality of service parameter of the second slice, except for the delay parameter, meets a quality of service requirement of the first slice. The first shard is a shard corresponding to the first session. The service quality parameters comprise a time delay parameter and a packet loss rate parameter, or comprise a time delay parameter and a bandwidth parameter, or comprise a time delay parameter, a packet loss rate parameter and a bandwidth parameter.

Illustratively, the second shard meeting the quality of service requirement of the first shard with the quality of service parameter other than the delay parameter may refer to: the bandwidth parameter of the second fragment is larger than or equal to the bandwidth parameter of the first fragment, and the packet loss rate parameter of the second fragment is smaller than or equal to the packet loss rate parameter of the first fragment.

Step 204, if the second fragment exists, the first indication information is sent to the first base station.

In step 204, the first indication information is used to instruct the first base station to use the second fragment to serve the first session.

It can be understood that, the parameters of the second slice and the first slice except the time delay parameter meet the service quality requirement of the first slice, and then the second slice can be used to provide services for the first session, and then the time parameters of the first session and other sessions are adjusted to solve the problem that the time parameters of the first session change after the second slice is used to provide services for the first session.

It will be appreciated that after the first base station receives the first indication information, the first base station may send a response message to the source base station, so that the source base station switches the terminal to the first base station. For example, the first base station may send the second response information to the source base station, so that the source base station sends the radio resource control RRC signaling to the terminal after receiving the second response information, and sends the RRC signaling to the first base station to complete the handover after the terminal completes time-frequency synchronization with the first base station. The second response information is used for indicating the source base station to send RRC signaling to the terminal.

In some embodiments, as shown in FIG. 4, step 208 is also included.

Step 208, acquiring a time delay difference value, and if the time delay difference value is greater than 0, transmitting the time delay difference value to the server, so that the server acquires the updated time parameters of the first session and the updated time parameters of other sessions according to a preset rule according to the time delay difference value.

In step 208, the delay difference is the difference between the initial delay parameter of the second slice and the initial delay parameter of the first slice.

In some embodiments, the updated time parameter of the first session includes an updated time delay parameter of the first session, the updated time delay parameter of the first session being a first time delay parameter of the first session, the first time delay parameter of the first session being a sum of an initial time delay parameter of the first session and a time delay difference value. The updated time parameters of the other sessions include updated transmission delays of the other sessions, the updated transmission delays of the other sessions are first transmission delays of the other sessions, and the first transmission delays of the other sessions are the sum of initial transmission delays and delay differences of the other sessions.

Illustratively, taking any one of the session 1, the session 2 and the session 3 as a first session and the other two as a second session as an example, the time parameters of the session 1, the session 2 and the session 3 are shown in table 1.

Table 1 time parameters for session 1, session 2 and session 3 when no handoff occurs

If the terminal of session 1 is handed over from the current serving base station of session 1 to a neighboring base station of the current serving base station of session 1, the first session may be session 1, and the other sessions may include session 2 and session 3. As shown in table 1, the first session initiation time parameters include a transmission delay of session 1 (0 ms) and a delay parameter of session 1 (20 ms), and the other session initiation time parameters may include a transmission delay of session 2 (0 ms), a delay parameter of session 2 (20 ms), a transmission delay of session 3 (0 ms), and a delay parameter of session 3 (20 ms).

According to steps 201 to 208, taking the delay difference of step 208 at the time of session 1 transmission handover as an example, it is 30 ms. It may be appreciated that the updated time parameter of the root first session includes an updated time delay parameter of the first session, the updated time delay parameter of the first session being a first time delay parameter of the first session, the first time delay parameter of the first session being a sum of an initial time delay parameter of the first session and a time delay difference value. The updated delay parameter of session 1 is the first delay parameter of session 1, and according to the delay parameter (20 ms) and the delay difference (30 ms) of session 1 in table 1, the first delay parameter of session 1 is 50ms, as shown in table 2, the updated delay parameter of session 1 is 50ms.

It may be appreciated that the updated time parameters of the other sessions include updated transmission delays of the other sessions, where the updated transmission delays of the other sessions are first transmission delays of the other sessions, and the first transmission delays of the other sessions are a sum of initial transmission delays of the other sessions and a delay difference value. The updated transmission delays of the other sessions are the first transmission delays of the other sessions, and according to the initial transmission delays (0 ms) and the delay difference values (30 ms) of the other sessions (session 2 and session 3) in table 1, the first transmission delays of the session 2 and the session 3 are 30ms, as shown in table 2, and the updated transmission delays of the session 2 and the session 3 are 30ms.

Table 2 time parameters of session 1, session 2, session 3 after terminal handover of session 1

According to table 2, the server may send data directly to the terminal of session 1, and send data to the terminal of session 2 and the terminal of session 3 at the same time after waiting for 30ms, respectively, so that the terminal of session 1, the terminal of session 2 and the terminal of session 3 may receive data from the server almost simultaneously within 50 ms.

In some embodiments, a situation may occur in which multiple session terminals are switched, for example, after the terminal corresponding to session 1 is switched, the terminal corresponding to session 2 or session 3 needs to be switched, and in this case, adjustment needs to be performed based on the time parameters of session 1, session 2, and session 3 in table 2.

For example, after the terminal of session 1 is handed over, if the terminal of session 2 needs to be handed over from the current serving base station to its neighboring base station of the current serving base station, the first session may include session 2, while the other sessions may include session 1 and session 3. It will be appreciated that, after the terminal of session 1 is switched, before the terminal of session 2 is switched, and in the case where the time parameters need to be calculated, the initial time parameters of session 1, session 2 and session 3 may refer to the time parameters of session 1, session 2 and session 3 in table 2. That is, as shown in Table 2, the first session initiation time parameters include the transmit delay of Session 2 (30 ms) and the delay parameter of Session 2 (20 ms), and the other session initiation time parameters may include the transmit delay of Session 2 (0 ms), the delay parameter of Session 2 (50 ms), the transmit delay of Session 3 (30 ms), and the delay parameter of Session 3 (20 ms)

According to steps 201 to 208, taking the delay difference in step 208 as an example when the terminal of session 2 is handed over to be 40 ms.

It may be appreciated that the updated time parameter of the first session includes an updated time delay parameter of the first session, where the updated time delay parameter of the first session is a first time delay parameter of the first session, and the first time delay parameter of the first session is a sum of an initial time delay parameter and a time delay difference value of the first session. The updated delay parameter of session 2 is the first delay parameter of session 2, and according to the delay parameter (20 ms) and the delay difference (40 ms) of session 2 in table 2, the first delay parameter of session 2 is 60ms, that is, as shown in table 3, the updated delay parameter of session 2 is 60ms.

It may be appreciated that the updated time parameters of the other sessions include updated transmission delays of the other sessions, where the updated transmission delays of the other sessions are first transmission delays of the other sessions, and the first transmission delays of the other sessions are a sum of initial transmission delays of the other sessions and a delay difference value. The updated transmission delay of session 1 is the first transmission delay of session 1, which is 40ms according to the transmission delay (0 ms) and the delay difference (40 ms) of session 1 in table 2. The updated transmission delay of session 3 is the first transmission delay of session 3, which is 70ms according to the initial transmission delay (30 ms) and the delay difference (40 ms) of session 3 in table 2. As shown in table 3, the updated transmission delay of session 1 is 40ms, and the updated transmission delay of session 3 is 70ms.

Table 3 time parameters of session 1, session 2, session 3 after terminal of session 1 and terminal of session 2 are switched

In some embodiments, the updated time parameter of the first session further comprises an updated transmission delay of the first session. And under the condition that the minimum value of the initial transmission delay of the first session and the first transmission delays of other sessions is not 0, the updated transmission delay of the first session is the first transmission delay of the first session, and the updated transmission delays of other sessions are the second transmission delays of other sessions. The first transmission delay of the first session is the difference between the initial transmission delay of the first session and the minimum value, and the second transmission delay of the other sessions is the difference between the first transmission delay of the other sessions and the minimum value.

It will be appreciated that, according to table 3, the minimum value of the transmission delay of the session 2, the transmission delay of the session 1, and the transmission delay of the session 3 is 30ms, and obviously, the minimum value is not 0, that is, the minimum value of the initial transmission delay of the first session and the first transmission delays of other sessions is not 0.

In this case, the updated time parameter of the first session further comprises an updated transmission delay of the first session. The updated transmission delay of the first session is the first transmission delay of the first session, and the updated transmission delays of the other sessions are the second transmission delays of the other sessions. The first transmission delay of the first session is the difference between the initial transmission delay of the first session and the minimum value, and the second transmission delay of the other sessions is the difference between the first transmission delay of the other sessions and the minimum value. As shown in table 3, the first transmission delay of session 2 is a difference between the initial transmission delay (30 ms) and the minimum value (30 ms) of session 2 of 0ms, the second transmission delay of session 1 is a difference between the first transmission delay (40 ms) and the minimum value (30 ms) of session 1 of 10ms, and the second transmission delay of session 3 is a difference between the first transmission delay (70 ms) and the minimum value (30 ms) of session 3 of 40ms. The updated transmission delay for session 2 is 0ms as shown in table 4. The updated transmission delay of session 1 is 10ms. The updated two-transmission delay of session 3 is 40ms.

Table 4 time parameters of session 1, session 2, session 3 after terminal of session 1 and terminal of session 2 are switched

In some embodiments, as shown in fig. 5, the method further comprises steps 209 to 210.

Step 209, receiving a first switching duration from a source base station.

In step 209, the first switching duration is a duration required for the terminal to switch from the source base station to the first base station.

Step 210, forwarding the first switching duration to the server, so that the server waits for the updated transmission delay of the first session and then transmits data to the terminal, and waits for the updated transmission delay of other sessions and then transmits data to the other sessions respectively after waiting for the first switching duration.

It will be appreciated that the time at which the data is received by the terminal of the first session and the terminals of the other sessions may remain consistent, in accordance with step 210.

In some embodiments, as shown in fig. 6, the method further comprises steps 211 to 212.

Step 211, receiving notification information from the first base station.

In step 211, the notification information is used to notify the core network device that the quality of service parameters of the first session have been restored. The notification information is sent by the first base station in response to switching the terminal to the second base station and in case the second base station supports the first fragmentation. The second base station is one of the neighboring base stations of the first base station.

Step 212, in response to receiving the notification information, sending second indication information to the server.

In step 212, the second indication information is used to instruct the server to restore the delay parameter of the first session to the initial delay parameter of the first session, and/or restore the transmission delay of the first session to the initial transmission delay of the first session, and restore the delay parameter of the other session to the initial delay parameter of the other session, and/or restore the transmission delay of the other session to the initial transmission delay of the other session.

It can be appreciated that steps 211 to 212 may enable the server to learn that the qos parameters of the first session have been restored to the qos parameters that can be provided by the first slice, so that the time parameters of the first session and the time parameters of other sessions need to be restored, which may reduce the network burden of the server.

For example, the method for the server to recover the delay parameter of the first session and/or the delay parameters of other sessions according to the second indication information may refer to the related descriptions of tables 1 to 4, which are not described herein again.

In some embodiments, as shown in fig. 7, the method further comprises steps 213 to 214.

Step 213, receiving a second handover duration from the first base station.

In step 213, the second handover duration is a duration required for the terminal to handover from the first base station to the second base station.

Step 214, forwarding the second switching duration to the server, so that the server waits for the initial transmission delay of the first session and then transmits data to the terminal after waiting for the second switching duration, and waits for the initial transmission delay of the other sessions and then transmits data to the other sessions respectively after waiting for the initial transmission delay of the second switching duration.

It will be appreciated that the times at which the terminals of the first session and the terminals of the other sessions receive data may remain consistent, in accordance with step 214.

According to the switching method provided by some embodiments of the invention, when the terminal is in the RRC_CONNECTED state, the source base station can ensure the delay consistency of the online network game related session by adjusting the delay while ensuring the continuity of the online network game related session as much as possible according to the measurement report of the terminal to the adjacent standard base station and the wireless resource management information and considering the fragmentation condition of the PDU session of the terminal under the condition that the source base station needs to switch the terminal to the adjacent base station, thereby avoiding substantial loss to the user due to the interruption of the online network game related session, and providing better network service for the user.

The following is an example of some embodiments of the invention.

In the prior art, when a terminal is switched between base stations in an rrc_connected state, the mobility process of the control plane includes:

(1) The source base station configures a UE measurement process, and the UE performs wireless signal measurement according to the measurement configuration and sends a measurement report to the source base station.

(2) The source base station decides to handover the UE to another base station based on the measurement report and the radio resource management information.

(3) The source base station sends a switching request to the target base station, wherein the switching request comprises the following steps: PDU session related information. The PDU session information further includes: fragmentation information, qoS flow class, qoS configuration information.

(4) And the target base station performs access control check on the terminal. If a slice associated with a certain PDU session at the terminal is not supported at the target base station, the target base station will refuse to serve the corresponding PDU session.

(5) And the target base station sends a switching request response to the source base station.

(6) The source base station instructs the terminal to switch to the target base station through RRC signaling.

(7) And the terminal completes time-frequency synchronization with the target base station, and sends RRC signaling to the target base station to complete the switching.

The basic method of the handover method provided in this example is as follows:

1. and the target base station sends the unsupported fragment list 1 to the source base station according to the fragment information corresponding to the terminal PDU session sent by the source base station.

2. And the source base station sends the fragment identification of each fragment in the list 1, the session identification corresponding to each fragment and the target base station identification to the core network equipment.

● The core network device may be a device for managing sessions or may be a dedicated service device.

3. The core network inquires the server side of each session (relative to the terminal) whether the session meets the preset condition.

● Presetting conditions: the session has other sessions related to the session at the server side, and the sessions need the same time parameter in order to ensure that the terminal side (such as a networking game player) of each session has a consistent service experience.

The time parameter consists of two parts, namely a delay parameter and a transmission delay:

the delay parameter is the expected delay of the transmission part of the network

The transmission delay is the waiting time before transmitting data to the terminal

If a certain session meets the preset condition, then

[1] Inquiring the target base station according to the fragment identifier A corresponding to the session identifier: and whether a fragment B matched with the fragment A exists or not, wherein the service quality parameters of the fragment B are in accordance with the service quality parameter requirements corresponding to the fragment A except the time delay parameters (such as bandwidth, packet loss rate and the like) (for example, the bandwidth parameters of the fragment B are not less than the bandwidth parameters of the fragment A, and the packet loss rate parameters of the fragment B are not more than the packet loss rate parameters of the fragment A).

[2] And obtaining a difference value D between the delay parameter of the fragment B and the delay parameter of the fragment A from the target base station.

[3] If the difference D is positive (the delay of the slice B is greater than the delay of the slice a), the difference D is sent to the server of the session.

Optionally, the simultaneous transmission to the server also comprises a time period T for which the terminal is expected to complete the handover from the source base station to the target base station. This duration is typically an empirical value.

[4] The target base station is instructed to provide service for this session using the quality of service parameters corresponding to fragment B.

4. The server performs the following operations according to the difference parameter from the core network.

[1] D is added to the delay parameter of the session and D is added to the transmission delay of other sessions requiring the same time parameter as the session.

[2] If the transmission delay of all the sessions is not 0 and the minimum transmission delay value is D1, subtracting D1 from the transmission delay of all the sessions.

[3] And waiting for the duration corresponding to each transmission delay parameter before transmitting data to the terminal corresponding to each session.

[4] If a time period T is received from the core network, then [3] is performed after a waiting time T (from the reception of T).

5. If the terminal is switched again after that, namely, when the target base station is switched to the second target base station, the second target base station supports the fragment A, the target base station informs the core network that the service quality parameters are recovered.

6. The core network instructs the server to recalculate the transmit delay parameter.

[1] D is subtracted from the delay parameter for the session and D is added to the transmit delay parameter.

[2] If the transmission delay of all sessions is not 0, and the minimum transmission delay value is D1,

the transmission delay for all sessions is subtracted by D1.

[4] Likewise, if a time period T (of which handover from the target base station to the second target base station is expected) is received from the core network at this time (the empirical value of the time period of the terminal between base stations within the same network is generally the same), then the execution is performed after a waiting time T (from the reception of T) [3].

One specific example is shown below:

i. the session identification is 1, and the other session identifications requiring the same time parameters as the session are 2 and 3, respectively. In the initial state, the time parameters are shown in the following table:

if the difference D is 30ms, the time parameter table at this time becomes:

when data is sent to the terminal corresponding to the session 1, the terminal does not need to wait;

it is necessary to wait 30ms for data to be sent to both session 2 and session 3. Because the transmission delay of the session 1 is 50ms and the transmission delay of the session 2 and the session 3 are 20ms, when data are transmitted to the session 2 and the session 3, the three terminals can receive the data simultaneously by waiting for 30ms, thereby eliminating the extra 30ms delay introduced by the fact that the target base station does not support the delay parameter of 20ms after the terminal corresponding to the session 1 is switched to the target base station. if, on the basis of B, the terminal corresponding to session 2 introduces an additional 40ms delay parameter due to the handover, then the time parameter table of the server side corresponding to step 4.[1] becomes:

Then the time parameter table of the service side [ corresponding to step 4 ] [2] becomes:

that is, the transmission delay of session 2 is minimum, 30ms, so the transmission delays of all sessions are subtracted by 30ms, the transmission delay of the final session 1 is 10ms, the transmission delay of session 2 is not the transmission delay, and the transmission delay of session 3 is 40ms.

And v. if after D, the terminal corresponding to the session 1 is switched to the second target base station supporting the fragment a due to the switching again, so that the time parameter table of the server side [ corresponding to step 6 ] [1] becomes:

i.e. the delay parameter of session 1 is restored to the state before introducing an additional 30ms delay (20 ms) and then this 20ms is added to the transmission delay.

If after E, the terminal corresponding to session 2 switches to the third target base station supporting fragment a due to the switching again, and then the time parameter table of the server first becomes:

since the transmission delay is not 0 at this time, the time parameter table of the server side corresponding to step 6.[2] finally becomes:

the "delay parameter" in this example is a value recorded in the server, and the server may test by sending a test packet to obtain an actual delay parameter between the server and the terminal, or may estimate the delay parameter between the server and the terminal by using a quality of service parameter provided by the network side. Therefore, the delay parameter is modified here, and only the value recorded by the server is modified, so that the service quality assurance parameter provided by the network in practice is not affected.

The "delay" in the "delay parameter of the fragment a" in step 3 refers to the maximum transmission delay value guaranteed for the session when the network provides the service.

Some embodiments of the present invention provide a core network device, as shown in fig. 8, where the core network device 800 includes a first set receiving module 801, a first session judging module 802, a second fragment judging module 803, and a first indication information sending module 804.

The first set receiving module 801 is configured to: a first set is received from a source base station. The first set is forwarded by the source base station to the core network device in response to receiving the first response information from the first base station. The first base station is one of the neighboring base stations of the source base station. The first response information is sent by the first base station to the source base station in response to receiving the first handover request information from the source base station. The first handover request information includes information of a slice corresponding to a protocol data unit PDU session currently established by the terminal. The first response information includes a first set. The first set includes an identifier of the first base station, a fragment identifier that is not supported by the first base station in the fragments corresponding to the current established PDU session, and a session identifier that is not supported by the first base station in the fragments corresponding to the current established PDU session. The terminal is a terminal corresponding to the first handover request. The source base station is the base station currently providing network services for the terminal.

The first session determination module 802 is configured to: judging whether the first set comprises a first session or not, wherein the first session meets a first preset condition, the first preset condition comprises that other sessions related to the first session exist at a server side of the first session, the other sessions are identical to time parameters of the first session, the time parameters comprise a time delay parameter and a sending time delay, and the time delay parameter is the time delay of network transmission. The transmission delay is the waiting time before the server transmits data to the terminal.

The second slice judgment module 803 is configured to: if the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises the second fragments. The second segment meets a second preset condition, which includes that the service quality parameters of the second segment except the time delay parameters meet the service quality requirements of the first segment. The first shard is a shard corresponding to the first session. The service quality parameters comprise a time delay parameter and a packet loss rate parameter, or a time delay parameter and a bandwidth parameter, or a time delay parameter, a packet loss rate parameter and a loan parameter.

The first indication information sending module 804 is configured to: and if the second fragments exist, sending first indication information to the first base station. The first indication information is used for indicating the first base station to provide service for the first session by using the second fragment.

In some embodiments, as shown in fig. 9, the core network device 800 further includes a delay difference value acquisition module 805. The delay difference value obtaining module 805 is configured to: and acquiring the time delay difference, and if the time delay difference is greater than 0, transmitting the time delay difference to the server so that the server acquires the updated time parameters of the first session and the updated time parameters of other sessions according to the time delay difference and a preset rule. The delay difference is the difference between the initial delay parameter of the second segment and the initial delay parameter of the first segment.

In some embodiments, as shown in fig. 10, the core network device 800 further includes a first switching duration receiving module 806 and a first switching duration forwarding module 807.

The first switching duration receiving module 806 is configured to: a first handoff duration is received from a source base station. The first switching duration is a duration required for the terminal to switch from the source base station to the first base station.

The first switching duration forwarding module 807 is configured to: and forwarding the first switching time length to the server, so that the server waits for the updated transmission delay of the first session and then transmits data to the terminal, and waits for the updated transmission delay of other sessions and then transmits data to other sessions respectively after waiting for the first switching time length.

In some embodiments, as shown in fig. 11, the core network device 800 further includes a notification information receiving module 808 and a second indication information transmitting module 809.

The notification information receiving module 808 is configured to: and receiving notification information from the first base station, wherein the notification information is used for notifying the core network equipment that the service quality parameters of the first session are recovered. The notification information is sent by the first base station in response to switching the terminal to the second base station and in case the second base station supports the first fragmentation. The second base station is one of the neighboring base stations of the first base station.

The second instruction information transmission module 809 is configured to: and sending second indication information to the server in response to receiving the notification information. The second indication information is used for indicating the server to restore the delay parameter of the first session to the initial delay parameter of the first session, and/or restore the transmission delay of the first session to the initial transmission delay of the first session, and restore the delay parameter of other sessions to the initial delay parameter of other sessions, and/or restore the transmission delay of other sessions to the initial transmission delay of other sessions.

In some embodiments, as shown in fig. 12, the core network device 800 further includes a second handover duration receiving module 810 and a second handover duration forwarding module 811.

The second switching duration receiving module 810 is configured to: a second handoff duration is received from the first base station. The second switching duration is a duration required by the terminal to switch from the first base station to the second base station.

The second switching duration forwarding module 811 is configured to: and forwarding the second switching time length to the server, so that the server waits for the initial transmission delay of the first session and then transmits data to the terminal after waiting for the second switching time length, and waits for the initial transmission delay of other sessions and then transmits data to other sessions respectively after waiting for the initial transmission delay of the second switching time length.

The specific solution and the beneficial effects of a core network device provided by some embodiments of the present invention may refer to the related description of a handover method provided by some embodiments of the present invention, which is not described herein again.

Some embodiments of the present invention provide a computer apparatus, as shown in fig. 13, where a computer apparatus 1300 includes a memory 1301 and a processor 1302, where the memory 1301 stores a computer program, and when the processor 1302 runs the computer program stored in the memory 1301, the processor 1302 performs the above-mentioned handover method.

The specific solution and the beneficial effects of a computer device provided by some embodiments of the present invention may refer to the related description of a switching method provided by some embodiments of the present invention, which is not described herein again.

Some embodiments of the present invention provide a computer readable storage medium having a computer program stored thereon, which when executed by a processor, the processor performs the handover method described above.

The specific embodiments and advantageous effects of a computer readable storage medium according to some embodiments of the present invention may refer to the relevant descriptions of a handover method according to some embodiments of the present invention, which are not described herein.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims

1. A handover method, applied to a core network device, the method comprising:

receiving a first set from a source base station; the first set is forwarded by the source base station to the core network device in response to receiving first response information from a first base station; the first base station is one base station in adjacent base stations of the source base station; the first response information is sent to the source base station by the first base station in response to receiving first switching request information from the source base station; the first switching request information comprises the information of the fragments corresponding to the protocol data unit PDU session which is currently established by the terminal; the first response information includes a first set; the first set comprises the identification of the first base station, the fragment identification which is not supported by the first base station in the fragments corresponding to the PDU session which is currently established, and the session identification which is not supported by the first base station in the fragments corresponding to the PDU session which is currently established; the terminal is a terminal corresponding to the first switching request; the source base station is a base station which provides network service for the terminal currently;

Judging whether the first set comprises a first session or not; the first session meets a first preset condition, the first preset condition comprises that other sessions related to the first session exist at a server side of the first session, the other sessions are identical to initial time parameters of the first session, the time parameters comprise a time delay parameter and a sending time delay, and the time delay parameter is the time delay of network transmission; the transmission delay is the waiting time before the server transmits data to the terminal;

if the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises a second fragment or not; the second fragments meet a second preset condition, wherein the second preset condition comprises that the service quality parameters of the second fragments except the time delay parameters meet the service quality requirements of the first fragments; the first fragments are fragments corresponding to the first session; the service quality parameters comprise a time delay parameter and a packet loss rate parameter, or comprise a time delay parameter and a bandwidth parameter, or comprise a time delay parameter, a packet loss rate parameter and a bandwidth parameter; and

if the second fragments exist, sending first indication information to the first base station; the first indication information is used for indicating the first base station to provide service for the first session by using a second fragment.

2. The handover method according to claim 1, further comprising:

acquiring a time delay difference value, if the time delay difference value is greater than 0, sending the time delay difference value to the server so that the server acquires updated time parameters of the first session and updated time parameters of the other sessions according to a preset rule according to the time delay difference value; the delay difference is the difference between the initial delay parameter of the second slice and the initial delay parameter of the first slice.

3. The handover method according to claim 2, wherein,

the updated time parameter of the first session comprises an updated time delay parameter of the first session, wherein the updated time delay parameter of the first session is the first time delay parameter of the first session, and the first time delay parameter of the first session is the sum of the initial time delay parameter of the first session and the time delay difference value;

the updated time parameters of the other sessions comprise updated transmission delays of the other sessions, the updated transmission delays of the other sessions are first transmission delays of the other sessions, and the first transmission delays of the other sessions are the sum of initial transmission delays of the other sessions and the delay difference value.

4. The handover method according to claim 3, wherein the updated time parameter of the first session further comprises an updated transmission delay of the first session;

under the condition that the minimum value of the initial transmission delay of the first session and the first transmission delays of other sessions is not 0, the updated transmission delay of the first session is the first transmission delay of the first session, and the updated transmission delay of the other sessions is the second transmission delay of the other sessions; the first transmission delay of the first session is the difference between the initial transmission delay of the first session and the minimum value, and the second transmission delay of the other session is the difference between the first transmission delay of the other session and the minimum value.

5. The handover method according to claim 4, further comprising:

receiving a first switching duration from a source base station; the first switching duration is a duration required by the terminal to switch from the source base station to the first base station; and

and forwarding the first switching duration to the server, so that the server waits for the updated transmission delay of the first session and then transmits data to the terminal after waiting for the updated transmission delay of the other sessions, and after waiting for the first switching duration, the server waits for the updated transmission delay of the other sessions and then transmits data to the other sessions respectively.

6. The switching method according to any one of claims 1 to 5, further comprising:

receiving notification information from the first base station, wherein the notification information is used for notifying the core network equipment that the service quality parameters of the first session are recovered; the notification information is sent by the first base station in response to switching the terminal to a second base station and is sent under the condition that the second base station supports the first fragmentation; the second base station is one of adjacent base stations of the first base station; and

transmitting second indication information to the server in response to receiving the notification information; the second indication information is used for indicating the server to restore the delay parameter of the first session to the initial delay parameter of the first session, and/or restore the transmission delay of the first session to the initial transmission delay of the first session, and restore the delay parameter of the other session to the initial delay parameter of the other session, and/or restore the transmission delay of the other session to the initial transmission delay of the other session.

7. The handover method according to claim 6, further comprising:

Receiving a second switching duration from the first base station; the second switching duration is the duration required by the terminal to switch from the first base station to the second base station; and

and forwarding the second switching duration to the server, so that the server waits for the initial transmission delay of the first session after waiting for the second switching duration, and then transmits data to the other sessions after waiting for the initial transmission delay of the other sessions after waiting for the second switching duration.

8. A core network device, comprising:

a first set receiving module configured to: receiving a first set from a source base station; the first set is forwarded by the source base station to the core network device in response to receiving first response information from a first base station; the first base station is one base station in adjacent base stations of the source base station; the first response information is sent to the source base station by the first base station in response to receiving first switching request information from the source base station; the first switching request information comprises the information of the fragments corresponding to the protocol data unit PDU session which is currently established by the terminal; the first response information includes a first set; the first set comprises the identification of the first base station, the fragment identification which is not supported by the first base station in the fragments corresponding to the PDU session which is currently established, and the session identification which is not supported by the first base station in the fragments corresponding to the PDU session which is currently established; the terminal is a terminal corresponding to the first switching request; the source base station is a base station which provides network service for the terminal currently;

A first session judgment module configured to: judging whether the first set comprises a first session or not, wherein the first session accords with a first preset condition, the first preset condition comprises that other sessions related to the first session exist at a server side of the first session, the other sessions are identical to time parameters of the first session, the time parameters comprise a time delay parameter and a sending time delay, and the time delay parameter is the time delay of network transmission; the transmission delay is the waiting time before the server transmits data to the terminal;

a second segment judgment module configured to: if the first session exists, searching the first base station according to the identification of the first base station and inquiring whether the first base station comprises a second fragment or not; the second fragments meet a second preset condition, wherein the second preset condition comprises that the service quality parameters of the second fragments except the time delay parameters meet the service quality requirements of the first fragments; the first fragments are fragments corresponding to the first session; the service quality parameters comprise a time delay parameter and a packet loss rate parameter, or a time delay parameter and a bandwidth parameter, or a time delay parameter, a packet loss rate parameter and a loan parameter; and

A first indication information transmitting module configured to: if the second fragments exist, sending first indication information to the first base station; the first indication information is used for indicating the first base station to provide service for the first session by using a second fragment.

9. A computer device comprising a memory and a processor, the memory having stored therein a computer program, which when executed by the processor performs the handover method according to any of claims 1 to 7.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the handover method according to any of claims 1 to 7.