CN110958651B

CN110958651B - Core network reselection method and device

Info

Publication number: CN110958651B
Application number: CN201811126918.5A
Authority: CN
Inventors: 周志宏; 袁乃华; 范晨; 曹怡鹏; 孔胜淼
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2022-06-14
Anticipated expiration: 2038-09-26
Also published as: CN110958651A

Abstract

The application provides a core network reselection method and a core network reselection device, wherein the method comprises the following steps: receiving a first forward relocation request sent by source core network equipment, wherein the first forward relocation request is sent by the source core network equipment after receiving a core network switching trigger request sent by a source base station; determining second target core network equipment according to the first forward relocation request and preset core network configuration information; and sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, and the source base station is switched to the second target core network device. The target core network equipment can reselect the switched target core network equipment for the terminal according to the core network configuration information; the situation that the target core network equipment cannot provide network service for the terminal well is avoided; and the switched target core network equipment conforms to the load sharing principle of the MME POOL.

Description

Core network reselection method and device

Technical Field

The present application relates to network technologies, and in particular, to a method and an apparatus for reselecting a core network.

Background

In the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP for short), a core network device is provided, a base station is hung below the core network device, and a terminal resides in the core network through the base station. The terminal can be switched from one core network device to another core network device, and then the terminal can be accessed to another core network from one core network.

In the prior art, when a terminal performs core network switching, a source core network device may send a forward relocation request to a target core network device, and then the terminal is switched from the source core network device to the target core network device.

However, in the prior art, the carrying capacity of the core network device is limited, and when the terminal is switched from the source core network device to the target core network device, the target core network device may not provide network service for the terminal well; in addition, in the handover in the prior art, the load-bearing capability of the target core network device is not considered, so that the handed over target core network device does not conform to the load sharing principle of a network node (MME) POOL (POOL for short).

Disclosure of Invention

The application provides a core network reselection method and a core network reselection device, which are used for solving the problems that target core network equipment cannot provide network service for a terminal well and the switched target core network equipment does not conform to the load sharing principle of MME POOL.

In a first aspect, the present application provides a core network reselection method applied to a first target core network device, including:

receiving a first forward relocation request sent by a source core network device, wherein the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent when the source base station determines that a terminal under the source base station has a location change;

determining second target core network equipment according to the first forward relocation request and preset core network configuration information;

and sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

Further, the core network configuration information is load information of at least one target core network device;

determining a second target core network device according to the first forward relocation request and preset core network configuration information, including:

determining the target core network equipment with the minimum load amount in the at least one target core network equipment;

and determining the target core network equipment with the minimum load as the second target core network equipment.

Further, the core network configuration information is a user carrying capacity of at least one target core network device;

determining the target core network equipment with the maximum user bearing capacity in the at least one target core network equipment;

and determining the target core network equipment with the maximum user bearing capacity as the second target core network equipment.

Further, the core network configuration information is POOL configuration of at least one target core network device;

determining the optimal POOL configuration target core network equipment in the at least one target core network equipment;

and determining the target core network equipment with the optimal POOL configuration as the second target core network equipment.

Further, the first forward relocation request includes reselection times;

before determining a second target core network device according to the first forward relocation request and the preset core network configuration information, the method further includes:

judging whether the reselection times are zero or not;

if so, sending a core network switching failure message to the source core network equipment;

and if not, determining that the reselection frequency is subtracted by one, sending the reselection frequency after the subtraction to the source core network equipment, and determining a second target core network equipment according to the first forward relocation request and preset core network configuration information.

Further, the second forward relocation request includes a reselection number after subtracting one.

Further, sending the identifier of the second target core network device to the source core network device includes:

and sending a general packet radio service technology tunnel protocol control plane (GTPC-relocation) message to the source core network device, wherein the GTPC-relocation message comprises the identifier of the second target core network device and the second forward relocation request.

In a second aspect, the present application provides a core network reselection method applied to a source core network device, including:

receiving a core network switching trigger request sent by a source base station, wherein the core network switching trigger request is sent when the source base station determines that a terminal under the source base station has a position change;

sending a first forward relocation request to first target core network equipment according to the core network switching trigger request, so that the first target core network equipment selects second target core network equipment according to the first forward relocation request and preset core network configuration information;

receiving an identifier of a second target core network device sent by the first target core network device;

and sending a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

Further, the first forward relocation request includes reselection times;

after sending the first forward relocation request to the first target core network device according to the core network handover trigger request, the method further includes:

and receiving the reselection times after subtracting one, which is sent by the first target core network device, wherein the reselection times after subtracting one is sent by the first target core network device when the reselection times is determined to be not zero.

Further, the second forward relocation request includes a reselection number after subtracting one;

after sending a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, the method further includes:

receiving a core network switching failure message sent by the second target core network device, wherein the core network switching failure message is sent by the second target core network device when the reselection time after subtracting one is determined to be zero;

alternatively, the first and second electrodes may be,

and receiving the identifier of the third target core network device and the reselection frequency obtained after subtracting one from the identifier of the third target core network device, which are sent by the second target core network device, when it is determined that the reselection frequency obtained after subtracting one from the identifier of the third target core network device is not zero.

Further, receiving the identifier of the second target core network device sent by the first target core network device includes:

receiving a GTPC-relocation message sent by a first target core network device, wherein the GTPC-relocation message comprises an identifier of a second target core network device and the second forward relocation request.

In a third aspect, the present application provides a core network reselection apparatus applied to a first target core network device, including:

a receiving module, configured to receive a first forward relocation request sent by a source core network device, where the first forward relocation request is sent by a source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent by the source base station when a location change occurs in a terminal under the source base station;

a determining module, configured to determine a second target core network device according to the first forward relocation request and preset core network configuration information;

a first sending module, configured to send the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

the determining module is specifically configured to:

and determining the target core network equipment with the minimum load amount as the second target core network equipment.

the determining module is specifically configured to:

Further, the first forward relocation request includes reselection times;

the device, still include:

a determining module, configured to determine whether the reselection time is zero before the determining module determines a second target core network device according to the first forward relocation request and preset core network configuration information;

a second sending module, configured to send a core network handover failure message to the source core network device if the reselection time is zero;

and the execution module is used for determining that one is subtracted from the reselection frequency if the reselection frequency is not zero, sending the reselection frequency after the subtraction to the source core network equipment, and executing the determination module.

Further, the first sending module is specifically configured to:

In a fourth aspect, the present application provides a core network reselection apparatus applied to a source core network device, including:

a first receiving module, configured to receive a core network handover trigger request sent by a source base station, where the core network handover trigger request is sent when the source base station determines that a location of a terminal under the source base station changes;

a first sending module, configured to send a first forward relocation request to a first target core network device according to the core network handover trigger request, so that the first target core network device selects a second target core network device according to the first forward relocation request and preset core network configuration information;

a second receiving module, configured to receive an identifier of a second target core network device sent by the first target core network device;

a second sending module, configured to send a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

Further, the first forward relocation request includes reselection times;

the device, still include:

a third receiving module, configured to receive, after the first sending module sends the first forward relocation request to the first target core network device according to the core network handover trigger request, the reselection time after subtracting one sent by the first target core network device, where the reselection time after subtracting one is sent by the first target core network device when it is determined that the reselection time is not zero.

the device, still include:

a fourth receiving module, configured to receive a core network handover failure message sent by the second target core network device after the second sending module sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, where the core network handover failure message is sent when the reselection frequency obtained after subtracting one is determined to be zero by the second target core network device;

alternatively, the first and second electrodes may be,

a fifth receiving module, configured to receive an identifier of a third target core network device and the reselection time obtained after subtracting one from the identifier of the third target core network device, where the identifier of the third target core network device and the reselection time obtained after subtracting one from the identifier of the third target core network device are sent by the second target core network device when it is determined that the reselection time obtained after subtracting one from the identifier of the third target core network device is not zero.

Further, the second receiving module is specifically configured to:

In a fifth aspect, the present application provides a first target core network device comprising means (means) for performing the steps of any of the methods of the first aspect above.

In a sixth aspect, the present application provides a first target core network device comprising a processor, a memory, and a computer program, wherein the computer program is stored in the memory and configured to be executed by the processor to implement any of the methods of the first aspect.

In a seventh aspect, the present application provides a first target core network device comprising at least one processing element or chip configured to perform any of the methods of the first aspect above.

In an eighth aspect, the present application provides a computer program for performing any of the methods of the first aspect above when executed by a processor.

In a ninth aspect, the present application provides a computer readable storage medium having stored thereon the computer program of the eighth aspect.

In a tenth aspect, the present application provides a source core network device comprising means (means) for performing the steps of any of the methods of the second aspect above.

In an eleventh aspect, the present application provides a source core network device, comprising a processor, a memory, and a computer program, wherein the computer program is stored in the memory and configured to be executed by the processor to implement any of the methods of the second aspect.

In a twelfth aspect, the present application provides a source core network device comprising at least one processing element or chip for performing any of the methods of the second aspect above.

In a thirteenth aspect, the present application provides a computer program for performing any of the methods of the second aspect above when executed by a processor.

In a fourteenth aspect, the present application provides a computer readable storage medium having stored thereon the computer program of the thirteenth aspect.

The method and the device for reselecting the core network receive a first forward relocation request sent by a source core network device, wherein the first forward relocation request is sent by the source core network device after receiving a core network switching trigger request sent by a source base station, and the core network switching trigger request is sent by the source base station when the position of a terminal under the source base station is determined to be changed; determining second target core network equipment according to the first forward relocation request and preset core network configuration information; and sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, and the source base station is switched to the second target core network device. Therefore, when the terminal needs to switch a new target core network device, the target core network device can reselect the switched target core network device for the terminal according to the core network configuration information; the situation that the target core network equipment cannot provide network service for the terminal well is avoided; and the switched target core network equipment conforms to the load sharing principle of MME POOL.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of an MME POOL scenario;

fig. 2 is a schematic flowchart of a core network reselection method according to an embodiment of the present application;

fig. 3 is a signaling interaction diagram of a core network reselection method according to an embodiment of the present application;

fig. 4 is a signaling interaction diagram of another core network reselection method according to an embodiment of the present application;

fig. 5 is a signaling interaction diagram of a handover procedure in another core network reselection method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a core network reselection apparatus applied to a first target core network device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another core network reselection apparatus applied to a first target core network device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a core network reselection apparatus applied to a source core network device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a first target core network device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a source core network device according to an embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The application has the specific application scenarios that:

when a 3rd Generation Partnership Project (3 GPP) Long Term Evolution (LTE) bears a single user Packet switched Domain (PS) service, load sharing between MMEs in a core network can be achieved through a network node (MME) POOL (POOL) technology. When the load of a core network device is higher and exceeds the processing capacity of the core network device, an MME POOL mechanism is introduced in the 3GPP standard, that is, a POOL is formed by multiple MMEs to realize resource sharing and load sharing. Fig. 1 is a schematic diagram of an MME POOL scenario, and as shown in fig. 1, at least one core network device 01 and at least one base station 02 are provided, and the base station and the core network device may form an MME POOL; the base station can be simultaneously connected to each set of MME in the MME POOL area, and the MME POOL can distribute services for the base station in proportion according to the capacity of each MME; the link state of the S1 interface is obtained through link state detection between the base station and the MME, for example, if the MME or the base station failure is detected, the MME accessed by the base station is adjusted between the base station and the core network device according to the available load balancing policies of the MME and the MME, and then the new access service request message is allocated to the MME in the other normal state.

It is known that, in the 3GPP technology, a core network device is provided, a base station is hung below the core network device, and a terminal resides in the core network through the base station. The terminal can be switched from one core network device to another core network device, and then the terminal can be accessed to another core network from one core network.

However, in the prior art, the carrying capacity of the core network device is limited, and when the terminal is switched from the source core network device to the target core network device, the target core network device may not provide network service for the terminal well; in addition, in the handover in the prior art, the load-bearing capability of the target core network device is not considered, so that the target core network device to be handed over conforms to the load sharing principle of the MME POOL.

The core network reselection method and the core network reselection device provided by the application aim to solve the above technical problems in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 2 is a flowchart illustrating a core network reselection method according to an embodiment of the present application. As shown in fig. 2, the method includes:

step 101, receiving a first forward relocation request sent by a source core network device, where the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent by the source base station when determining that a terminal under the source base station has a location change.

In this embodiment, specifically, the execution main body of this embodiment may be the first target core network device.

When the position of the terminal is changed, the source base station receives the position change information of the terminal; then, the source base station sends a core network switching trigger request to the source core network equipment, and the core network switching trigger request represents that the source base station requests to be a terminal switching target core network; then, the source core network device sends a first forward relocation request to the first target core network device, wherein the first forward relocation request is characterized in that the terminal switches the target core network.

And step 102, determining a second target core network device according to the first forward relocation request and preset core network configuration information.

Optionally, step 102 includes the following implementation manners:

first implementation of step 102: the core network configuration information is load information of at least one target core network device; determining the target core network equipment with the minimum load amount in at least one target core network equipment; and determining the target core network equipment with the minimum load amount as second target core network equipment.

Second implementation of step 102: the core network configuration information is the user carrying capacity of at least one target core network device; determining the target core network equipment with the maximum user bearing capacity in at least one target core network equipment; and determining the target core network equipment with the maximum user bearing capacity as second target core network equipment.

Third implementation of step 102: the core network configuration information is POOL configuration of at least one target core network device; determining the optimal target core network equipment configured by the POOL in at least one target core network equipment; and determining the target core network equipment with the optimal POOL configuration as second target core network equipment.

In this embodiment, specifically, the first target core network device may obtain core network configuration information, where the core network configuration information includes at least one of the following: load information of each target core network device, user carrying capacity of each target core network device, and POOL configuration of each target core network device.

After the first target core network device receives the first forward relocation request, the first target core network device selects a suitable second target core network device according to the core network configuration information. Specifically, the first target core network device selects a suitable target core network device as the second target core network device according to the POOL configuration and/or the load sharing condition of each candidate target core network device.

For example, the first target core network device analyzes the load of each candidate target core network device, and determines the target core network device with the minimum load, wherein the load represents the current load condition of the target core network device; then, the first target core network device determines the target core network device with the minimum load as a second target core network device.

For another example, the first target core network device analyzes the user carrying capacity of each candidate target core network device, and determines the target core network device with the maximum user carrying capacity, wherein the user carrying capacity represents the number of users that the target core network device can carry; then, the first target core network device determines the target core network device with the largest user carrying capacity as a second target core network device.

For another example, the first target core network device analyzes the POOL configuration of each candidate target core network device to determine a target core network device with the optimal POOL configuration; then, the first target core network device determines a target core network device with the optimal POOL configuration as a second target core network device.

For another example, the first target core network device analyzes the POOL configuration and the load amount of each candidate target core network device, and determines the target core network device with the optimal POOL configuration and the load amount smaller than a preset threshold; and then, the first target core network device determines the target core network device with the optimal POOL configuration and the load amount smaller than a preset threshold value as a second target core network device.

Step 103, sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

In this embodiment, specifically, the first target core network device sends the determined identifier of the second target core network device to the source core network device; the source core network device may send a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device, where the second forward relocation request represents a request to bring the terminal to the second target core network device; then, the core network handover procedure can be executed, and the source base station is handed over to the second target core network device, so that the terminal can be hung to the second target core network device.

Fig. 3 is a signaling interaction diagram of a core network reselection method provided in an embodiment of the present application, configured to execute the method shown in fig. 2, where as shown in fig. 3, the method includes:

s11, the terminal transmits the location change information to the source base station.

S12, the source base station sends a core network switching trigger request to the source core network device, and the core network switching trigger request represents that the source base station request is a terminal switching target core network.

S13, the source core network device sends a first forward relocation request to the first target core network device, where the first forward relocation request is characterized by a terminal switching target core network.

And S14, the first target core network device determines a second target core network device according to the first forward relocation request and the preset core network configuration information.

S15, the first target core network device sends the identifier of the second target core network device to the source core network device.

S16, the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

The steps S11-S17 can refer to the steps in fig. 2, and are not described again.

In this embodiment, a first forward relocation request sent by a source core network device is received, where the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent by the source base station when the source base station determines that a location of a terminal under the source base station has changed; determining second target core network equipment according to the first forward relocation request and preset core network configuration information; and sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, and the source base station is switched to the second target core network device. Therefore, when the terminal needs to switch a new target core network device, the target core network device can reselect the switched target core network device for the terminal according to the core network configuration information; the situation that the target core network equipment cannot provide network service for the terminal well is avoided; and the switched target core network equipment conforms to the load sharing principle of MME POOL.

Fig. 4 is a signaling interaction diagram of another core network reselection method according to an embodiment of the present application, as shown in fig. 4, including:

s21, the terminal transmits the location change information to the source base station.

In this embodiment, specifically, when the location of the terminal is changed, the terminal transmits location change information to the source base station.

S22, the source base station sends a core network switching trigger request to the source core network device, and the core network switching trigger request represents that the source base station request is a terminal switching target core network.

S23, the source core network device sends a first forward relocation request to the first target core network device, where the first forward relocation request is characterized by a terminal switching target core network, and the first forward relocation request includes a reselection time N, where N is an integer.

In this embodiment, specifically, the first forward relocation request is characterized as a terminal handover target core network; in order to avoid that the first target core network device reselects the second target core network device, and the second target core network device selects the first target core network device or other target core network devices, so that the handover request generates multiple reselection oscillations, the reselection times N may be carried in the first forward relocation request.

S24, the first target core network device determines whether the reselection time N is zero.

And S25, if the first target core network device determines that the reselection time N is zero, sending a core network switching failure message to the source core network device.

In this embodiment, specifically, after step S24, if the first target core network device determines that the reselection time N is zero, the first target core network device determines that the core network device cannot be switched for the terminal, so that the first target core network device sends a core network switching failure message to the source core network device. Then, step S26 and the following steps are not performed.

And S26, if the first target core network device determines that the reselection time N is not zero, determining a second target core network device according to the first forward relocation request and preset core network configuration information, acquiring the core network configuration information, and determining that the reselection time N minus one.

In this embodiment, specifically, after step S24, if the first target core network device determines that the reselection time N is not zero, the first target core network device may subtract one from the reselection time N to obtain N-1; and, the first target core network device has already obtained the core network configuration information, and may determine the second target core network device according to the core network configuration information.

S27, the first target core network device sends the identification of the second target core network device and the reselection times N-1 after subtracting one to the source core network device.

Optionally, step S27 includes: the first target core network device sends a General Packet Radio Service Tunnel Protocol Control plane (GTPC) -relocation message to the source core network device, where the GTPC-relocation message includes an identifier of the second target core network device, a second forward relocation request, and reselection times after subtracting one from the second forward relocation request.

In this embodiment, specifically, the first target core network device sends a GTPC-relocation message to the source core network device, where the GTPC-relocation message carries an identifier of the second target core network device, a second forward relocation request, and N-1.

S28, the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device, where the second forward relocation request includes reselection time N-1 after subtracting one.

In this embodiment, specifically, the source core network device sends a second forward relocation request to the second target core network device, where the second forward relocation request includes reselection time N-1 after subtracting one.

S29, the second target core network device judges whether the reselection frequency N-1 after subtracting one is zero.

S210, if the reselection frequency N-1 after subtracting one is determined to be zero, the second target core network device sends a core network switching failure message to the source core network device.

In this embodiment, specifically, after step S29, if the second target core network device determines that N-1 is zero, the second target core network device determines that the second target core network device is not the terminal handover core network device, and then the second target core network device sends a core network handover failure message to the source core network device. At this time, step S211 and step S212 are not being executed.

S211, if the reselection time N-1 after subtracting one is determined not to be zero, the second target core network device executes a switching process of switching the source base station to the second target core network device.

In this embodiment, specifically, after step S29, if the second target core network device determines that N-1 is not zero, the second target core network device determines to execute a handover procedure of switching the source base station to the second target core network device, and then hangs down the terminal to the second target core network device.

S212, if the second target core network device determines that the reselection time N-1 after subtracting one is not zero and the second target core network device determines that the terminal is not accepted, the second target core network device determines a third target core network device according to the core network configuration information; the second target core network device sends the identifier of the third target core network device and the reselection times N-2 after subtracting one from the identifier of the third target core network device to the source core network device.

In this embodiment, specifically, after step S29, if the second target core network device determines that N-1 is not zero but the second target core network device does not accept the terminal, the second target core network device may subtract one from N-1 to obtain N-2; then, the second target core network device may determine a third target core network device according to the core network configuration information, and then the second target core network device sends the identifier of the third target core network device and N-2 to the source core network device; and the source core network device reselects the third target core network device.

Fig. 5 is a signaling interaction diagram of a handover procedure in another core network reselection method provided in this embodiment of the present application, and as shown in fig. 5, fig. 5 shows a signaling interaction process of a handover procedure in which a source base station is handed over to a second target core network device, where the signaling interaction process includes:

s31, the Source core network device (Source MME) sends a Forward Relocation Request (Forward Relocation Request) to the Target core network device (Target MME).

S32, the Target core network device sends a Create Session Request (Create Session Request) message to the Target Serving gateway (Target Serving GW).

S32a, the target service gateway sends a Create Session Response (Create Session Response) message to the target core network device.

S33, the Target core network device sends a Handover Request (Handover Request) to the Target base station (Target eNodeB).

S33a, the target base station sends a Handover Request response (Handover Request Acknowledge) message to the target core network device.

S34, the target core network device sends a Request (Create index Data Forwarding Tunnel Request) for creating an Indirect Data Forwarding Tunnel to the target service gateway.

S34a, the target service gateway sends a Create Indirect Data Forwarding Tunnel Response (Create Indirect Data Forwarding Tunnel Response) message to the target core network device.

S35, the target core network device sends a Forward Relocation Response (Forward Relocation Response) message to the source core network device.

S36, the Source core network device sends a Create Indirect Data Forwarding Tunnel Request (Create Indirect Data Forwarding Tunnel Request) to a Source Serving gateway (Source Serving GW).

S36a, the source service gateway sends a Create Indirect Data Forwarding Tunnel Response (Create Indirect Data Forwarding Tunnel Response) message to the source core network device.

S37, the Source core network device sends a Handover Command (Handover Command) to the Source base station (Source eNodeB).

S37a, the source base station sends a Handover Command (Handover Command) to the terminal.

S38, the source base station sends a base station state Transfer (eNB Status Transfer) message to the source core network device.

S38a, the source core network device sends a Forward Access Context Notification (Forward Access Context Notification) to the target core network device.

S38b, the target core network device sends a Forward Access Context notification response (Forward Access Context Acknowledge) message to the source core network device.

S38c, the target core network device sends an MME state Transfer (MME Status Transfer) message to the target base station.

S39a, the source base station sends a Direct Forwarding Of Data (Only For Direct Forwarding Of Data) message to the target base station.

S39b, the source base station sends a Direct Forwarding (Only For Direct Forwarding Of Data) message For Data to the target service gateway through the source service gateway. And, the separation From the Old Cell And the synchronization To the new Cell (Detach From Old Cell And synchronization To be Cell) are completed between the terminal And the target base station.

S310, the terminal transmits a Handover confirmation Downlink Data (Handover Confirm Downlink Data) message to the target base station. The terminal sends Uplink User Plane Data (Uplink User Plane Data) to a Packet Data Network Gateway (PDN GW) through the target base station and the target serving Gateway.

S311, the target base station sends a Handover notification (Handover notification) to the target core network device.

S312, the target core network device sends a Forward migration completion Notification (Forward Relocation Complete Notification) to the source core network device.

S312b, the source core network device sends a Forward migration completion notification response (Forward Relocation Complete Acknowledge) message to the target core network device.

S313, the target core network equipment sends a Request (Modify Bearer Request) for modifying the ticket holder to the target service gateway.

S314, the target serving gateway sends a Modify Bearer Request (Modify Bearer Request) to a Home Subscriber Server (HSS).

S314a, the home subscriber server sends a Modify Bearer Response (Modify Bearer Response) message to the target service gateway.

S315, the target service gateway sends a modified Bearer Response (modified Bearer Response) message to the target core network device. And the packet Data gateway transmits Downlink User Plane Data (Downlink User Plane Data) to the terminal through the target serving gateway and the target base station.

S316, the terminal completes the Tracking Area Update process (Tracking Area Update Procedure).

S317c, the source core network device sends a Delete Session Request (Delete Session Request) to the source service gateway.

S317a, the source core network device sends a terminal Context Release Command (UE Context Release Command) to the source base station.

S317b, the source base station sends a terminal Context Release Complete (UE Context Release Complete) message to the source core network device.

S317d, the source service gateway sends a Delete Session Response (Delete Session Response) message to the source core network device.

S318a, the source core network device sends a Delete Indirect Data Forwarding Tunnel Request (Delete index Data Forwarding Tunnel Request) to the source service gateway.

S318b, the source service gateway sends a Delete Indirect Data Forwarding Tunnel Response (Delete index Data Forwarding Tunnel Response) message to the source core network device.

S319a, the target core network device sends a Request for deleting an Indirect Data Forwarding Tunnel (Delete index Data Forwarding Tunnel Request) to the target serving gateway.

S319b, the target serving gateway sends a Delete Indirect Data Forwarding Tunnel Response (Delete index Data Forwarding Tunnel Response) message to the target core network device.

In this embodiment, a first forward relocation request sent by a source core network device is received, where the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent by the source base station when the source base station determines that a location of a terminal under the source base station has changed; determining second target core network equipment according to the first forward relocation request and preset core network configuration information; and sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, and the source base station is switched to the second target core network device. Therefore, when the terminal needs to switch a new target core network device, the target core network device can reselect the switched target core network device for the terminal according to the core network configuration information; the situation that the target core network equipment cannot provide network service for the terminal well is avoided; and the switched target core network equipment conforms to the load sharing principle of MME POOL. And, by judging whether the reselection times is the other, frequent oscillation of the handover request between the source core network and the target core network can be avoided.

Fig. 6 is a schematic structural diagram of a core network reselection apparatus applied to a first target core network device according to an embodiment of the present application, as shown in fig. 6, the apparatus of this embodiment may include:

the receiving module 61 is configured to receive a first forward relocation request sent by a source core network device, where the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent by the source base station when the source base station determines that a location of a terminal under the source base station changes.

The determining module 62 is configured to determine the second target core network device according to the first forward relocation request and the preset core network configuration information.

A first sending module 63, configured to send the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

The core network reselection apparatus applied to the first target core network device in this embodiment may perform the actions of the first target core network device in the core network reselection method applied to the first target core network device shown in fig. 2 to fig. 3, and the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 7 is a schematic structural diagram of another core network reselection apparatus applied to a first target core network device according to an embodiment of the present application, where on the basis of the embodiment shown in fig. 6, as shown in fig. 7, in the apparatus according to this embodiment, core network configuration information is load information of at least one target core network device; the determining module 62 is specifically configured to: determining the target core network equipment with the minimum load amount in at least one target core network equipment; and determining the target core network equipment with the minimum load amount as second target core network equipment.

Or the core network configuration information is the user carrying capacity of at least one target core network device; the determining module 62 is specifically configured to: determining the target core network equipment with the maximum user bearing capacity in at least one target core network equipment; and determining the target core network equipment with the maximum user bearing capacity as second target core network equipment.

Or the core network configuration information is POOL configuration of at least one target core network device; the determining module 62 is specifically configured to: determining the optimal target core network equipment configured by the POOL in at least one target core network equipment; and determining the target core network equipment with the optimal POOL configuration as second target core network equipment.

The first forward relocation request comprises reselection times; the apparatus provided in this embodiment further includes:

a determining module 71, configured to determine whether the reselection time is zero before the determining module 62 determines the second target core network device according to the first forward relocation request and the preset core network configuration information.

A second sending module 72, configured to send a core network handover failure message to the source core network device if the reselection time is zero.

And an executing module 73, configured to determine that the reselection time is subtracted by one if the reselection time is not zero, send the reselection time after the subtraction by one to the source core network device, and execute the determining module 62.

The second forward relocation request includes the number of reselections after subtracting one.

The first sending module 63 is specifically configured to: and sending a general packet radio service technology tunnel protocol control plane GTPC-relocation message to the source core network equipment, wherein the GTPC-relocation message comprises the identifier of the second target core network equipment and a second forward relocation request.

The core network reselection apparatus applied to the first target core network device in this embodiment may perform the actions of the first target core network device in the core network reselection method applied to the first target core network device shown in fig. 4 to 5, and the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 8 is a schematic structural diagram of a core network reselection apparatus applied to a source core network device according to an embodiment of the present application, and as shown in fig. 8, the apparatus according to this embodiment may include:

a first receiving module 81, configured to receive a core network handover trigger request sent by a source base station, where the core network handover trigger request is sent when the source base station determines that a location of a terminal under the source base station changes;

a first sending module 82, configured to send a first forward relocation request to a first target core network device according to a core network handover trigger request, so that the first target core network device selects a second target core network device according to the first forward relocation request and preset core network configuration information;

a second receiving module 83, configured to receive an identifier of a second target core network device sent by a first target core network device;

a second sending module 84, configured to send a second forward relocation request to a second target core network device corresponding to an identifier of a second target core network device according to the identifier of the second target core network device, so that the source base station is switched to the second target core network device.

The first forward relocation request comprises reselection times; the apparatus provided in this embodiment further includes: the third receiving module 91 is configured to receive, after the first sending module 82 sends the first forward relocation request to the first target core network device according to the core network handover trigger request, the reselection time after subtracting one from the first target core network device, where the reselection time after subtracting one is sent by the first target core network device when it is determined that the reselection time is not zero.

The second forward relocation request comprises reselection times after subtracting one; the apparatus provided in this embodiment further includes: a fourth receiving module 92, configured to receive a core network handover failure message sent by the second target core network device after the second sending module 84 sends the second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, where the core network handover failure message is sent by the second target core network device when it is determined that the reselection frequency after subtracting one is zero.

Alternatively, the first and second electrodes may be,

a fifth receiving module 93, configured to receive, after the second sending module 84 sends the second forward relocation request to the second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, the identifier of the third target core network device sent by the second target core network device and the reselection time obtained after subtracting one from the identifier of the third target core network device are sent by the second target core network device when it is determined that the reselection time obtained after subtracting one from the identifier of the third target core network device is not zero.

The second receiving module 83 is specifically configured to: and receiving a GTPC-relocation message sent by the first target core network device, wherein the GTPC-relocation message comprises the identifier of the second target core network device and a second forward relocation request.

The core network reselection apparatus applied to the source core network device in this embodiment may perform the actions of the source core network device in the core network reselection method applied to the source core network device shown in fig. 2 to fig. 5, and the implementation principle and the technical effect are similar, and are not described herein again.

Fig. 9 is a schematic structural diagram of a first target core network device provided in an embodiment of the present application, and as shown in fig. 9, an embodiment of the present application provides a first target core network device, which may be used to execute actions or steps of the first target core network device in the embodiments shown in fig. 2 to fig. 5, and specifically includes: a processor 2701, memory 2702, and a communication interface 2703.

The memory 2702 is used to store computer programs.

The processor 2701 is configured to execute the computer program stored in the memory 2702 to implement the actions of the first target core network device in the embodiments shown in fig. 2 to fig. 5, which is not described again.

Optionally, the first target core network device may further include a bus 2704. The processor 2701, the memory 2702, and the communication interface 2703 may be connected to each other via a bus 2704; the bus 2704 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 2704 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.

In the embodiments of the present application, the above embodiments may be referred to and referred to by each other, and the same or similar steps and terms are not repeated.

Alternatively, part or all of the above modules may also be implemented by being embedded on a certain chip of the first target core network device in the form of an integrated circuit. And they may be implemented separately or integrated together. That is, the above modules may be configured as one or more integrated circuits implementing the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others.

In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as the memory 2702 comprising instructions, executable by the processor 2701 of the first target core network device to perform the method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Fig. 10 is a schematic structural diagram of a source core network device provided in an embodiment of the present application, and as shown in fig. 10, an embodiment of the present application provides a source core network device, which may be used to execute actions or steps of the source core network device in the embodiments shown in fig. 2 to fig. 5, and specifically includes: a processor 2801, memory 2802, and a communication interface 2803.

A memory 2802 for storing computer programs.

The processor 2801 is configured to execute a computer program stored in the memory 2802 to implement the actions of the source core network device in the embodiments shown in fig. 2 to fig. 5, which are not described again.

Optionally, the source core network device may also include a bus 2804. The processor 2801, the memory 2802, and the communication interface 2803 may be connected to one another by a bus 2804; the bus 2804 may be a PCI bus, an EISA bus, or the like. The bus 2804 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

Alternatively, part or all of the above modules may be implemented by being embedded in a chip of the source core network device in the form of an integrated circuit. And they may be implemented separately or integrated together. That is, the above modules may be configured as one or more integrated circuits implementing the above methods, for example: one or more ASICs, or one or more DSPs, or one or more FPGAs, etc.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 2802 comprising instructions, executable by the processor 2801 of the source core network device to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

A non-transitory computer readable storage medium, wherein instructions, when executed by a processor of a first target core network device, enable the first target core network device to perform the actions of the first target core network device in the above core network reselection method.

A non-transitory computer readable storage medium, wherein instructions, when executed by a processor of a source core network device, enable the source core network device to perform actions of the source core network device in the above core network reselection method.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, core network reselection device, or data center to another website, computer, core network reselection device, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated core network reselection devices, data centers, and the like. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A core network reselection method applied to a first target core network device is characterized by comprising the following steps:

receiving a first forward relocation request sent by source core network equipment, wherein the first forward relocation request is sent by the source core network equipment after receiving a core network switching trigger request sent by a source base station, and the core network switching trigger request is sent when the source base station determines that a terminal under the source base station has a position change; the first forward relocation request comprises reselection times;

sending the identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device;

judging whether the reselection times are zero or not;

if not, determining that the reselection frequency is subtracted by one, sending the reselection frequency after the subtraction to the source core network equipment, and determining a second target core network equipment according to the first forward relocation request and preset core network configuration information;

sending the identifier of the second target core network device to the source core network device, including:

2. The method of claim 1, wherein the core network configuration information is load information of at least one target core network device;

3. The method of claim 1, wherein the core network configuration information is a user bearer of at least one target core network device;

4. The method of claim 1, wherein the core network configuration information is a POOL configuration of at least one target core network device;

5. The method according to claim 1, wherein the second forward relocation request comprises a number of reselections after subtracting one.

6. A core network reselection method applied to a source core network device is characterized by comprising the following steps:

sending a first forward relocation request to first target core network equipment according to the core network switching trigger request, so that the first target core network equipment selects second target core network equipment according to the first forward relocation request and preset core network configuration information; the first forward relocation request comprises reselection times;

sending a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device according to the identifier of the second target core network device, so that the source base station is switched to the second target core network device;

after the sending the first forward relocation request to the first target core network device according to the core network handover trigger request, the method further includes:

receiving the reselection times after subtracting one, which is sent by the first target core network device, wherein the reselection times after subtracting one is sent by the first target core network device when the reselection times is determined not to be zero;

receiving the identifier of the second target core network device sent by the first target core network device, including:

7. The method according to claim 6, wherein the second forward relocation request includes a number of reselections after subtracting one;

alternatively, the first and second electrodes may be,

8. A core network reselection apparatus applied to a first target core network device, comprising:

a receiving module, configured to receive a first forward relocation request sent by a source core network device, where the first forward relocation request is sent by the source core network device after receiving a core network handover trigger request sent by a source base station, and the core network handover trigger request is sent when the source base station determines that a location of a terminal under the source base station has changed; the first forward relocation request comprises reselection times;

a first sending module, configured to send an identifier of the second target core network device to the source core network device, so that the source core network device sends a second forward relocation request to a second target core network device corresponding to the identifier of the second target core network device, so that the source base station is switched to the second target core network device;

an executing module, configured to determine that one is subtracted from the reselection frequency if the reselection frequency is not zero, send the reselection frequency after the subtraction to the source core network device, and execute the determining module;

the first sending module is specifically configured to send a GTPC-relocation message for a gprs control plane to the source core network device, where the GTPC-relocation message includes an identifier of the second target core network device and the second forward relocation request.

9. The apparatus of claim 8, wherein the core network configuration information is load information of at least one target core network device;

the determining module is specifically configured to:

10. The apparatus of claim 8, wherein the core network configuration information is a user bearer of at least one target core network device;

the determining module is specifically configured to:

11. The apparatus of claim 8, wherein the core network configuration information is a POOL configuration of at least one target core network device;

the determining module is specifically configured to:

12. The apparatus of claim 8, wherein the second forward relocation request comprises a number of reselections after subtracting one.

13. A core network reselection apparatus applied to a source core network device, comprising:

a first sending module, configured to send a first forward relocation request to a first target core network device according to the core network handover trigger request, so that the first target core network device selects a second target core network device according to the first forward relocation request and preset core network configuration information; the first forward relocation request comprises reselection times;

a second sending module, configured to send a second forward relocation request to a second target core network device corresponding to an identifier of the second target core network device according to the identifier of the second target core network device, so that the source base station is switched to the second target core network device;

a third receiving module, configured to receive, after the first sending module sends a first forward relocation request to a first target core network device according to the core network handover trigger request, a reselection time after subtracting one from the first target core network device, where the reselection time after subtracting one is sent by the first target core network device when it is determined that the reselection time is not zero;

the second receiving module is specifically configured to receive a GTPC-relocation message sent by a first target core network device, where the GTPC-relocation message includes an identifier of the second target core network device and the second forward relocation request.

14. The apparatus according to claim 13, wherein the second forward relocation request includes a number of reselections after subtracting one;

the device, still include:

alternatively, the first and second electrodes may be,