CN115134801B

CN115134801B - Called domain selection method, electronic device and computer readable storage medium

Info

Publication number: CN115134801B
Application number: CN202110316245.5A
Authority: CN
Inventors: 张秀成; 张艳琼; 牛丽丽; 刘召阳; 和静; 杨亚红; 王玉星; 陈倩; 刘海瑞; 陈雪莉; 郑玮
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Henan Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Henan Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2023-10-27
Anticipated expiration: 2041-03-24
Also published as: CN115134801A

Abstract

The invention provides a called domain selection method, electronic equipment and a computer readable storage medium. The method comprises the following steps: when an attachment request or a cross-system area update request initiated by user equipment is received, determining whether an SGSN address is stored in a Home Subscriber Server (HSS); the attach request or the cross-system area update request carries 4G non-access stratum information; if yes, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 2/3/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

Description

Called domain selection method, electronic device and computer readable storage medium

Technical Field

The present document relates to the field of mobile communication core networks, and in particular, to a called domain selection method, an electronic device, and a computer readable storage medium.

Background

Currently, under the definition of the third generation partnership project 3GPP specifications, terminal diversity and complexity of the wireless network environment may cause 2/3/4G interaction anomalies. In the case of abnormal 2/3/4G interaction, for example, when the ue moves from the 4G network to the 2/3G network and returns to the 4G network, the home subscriber server HSS stores both the MME address and the SGSN address of the mobility management entity, and at this time, although the ue uses the 4G network, the HSS matches the 2/3G network according to the called domain selection result determined by the MME address and the SGSN address.

Therefore, the technical problem of low accuracy of the called domain selection result of the user equipment when 2/3/4G interaction is abnormal exists in the prior art.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a called domain selection method, an electronic device, and a computer readable storage medium, so as to solve the problem of how to improve the accuracy of a called domain selection result when a user equipment experiences 2/3/4G interaction abnormality.

In order to solve the technical problems, the embodiment of the invention is realized as follows:

In a first aspect, an embodiment of the present invention provides a called domain selection method, which is applied to a mobility management entity MME, where the method includes:

when an attachment request or a cross-system area update request initiated by user equipment is received, determining whether an SGSN address is stored in a Home Subscriber Server (HSS); the attach request or the cross-system area update request carries 4G non-access stratum information;

if yes, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information.

In a second aspect, an embodiment of the present invention provides a called domain selection method, applied to a home subscriber server HSS, including:

acquiring an address deleting instruction sent by a Mobility Management Entity (MME); the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores an SGSN address and an MME address;

Deleting the SGSN address according to the address deleting instruction;

and determining a called domain selection result according to the MME address, so that the called domain selection result is matched with the 4G non-access stratum information.

In a third aspect, an embodiment of the present invention provides a mobility management entity MME device, including:

the address determining module is used for determining whether the SGSN address is stored in the home subscriber server HSS or not when an attachment request or a cross-system area update request initiated by user equipment is received; the attach request or the cross-system area update request carries 4G non-access stratum information;

if yes, the instruction sending module is operated and used for sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information.

In a fourth aspect, an embodiment of the present invention provides a home subscriber server HSS, including:

the instruction acquisition module is used for acquiring an address deletion instruction sent by the mobility management entity MME; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores an SGSN address and an MME address;

The address deleting module is used for deleting the SGSN address according to the address deleting instruction;

and the called domain determining module is used for determining a called domain selection result according to the MME address so that the called domain selection result is matched with the 4G non-access stratum information.

In a fifth aspect, an embodiment of the present invention provides an electronic device, including: the device comprises a memory and a processor, wherein the memory stores computer executable instructions which, when executed by the processor, can implement the called domain selection method according to the first aspect or the second aspect.

In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, in which computer executable instructions are stored, which when executed by a processor, enable the called domain selection method according to the first aspect or the second aspect.

According to the technical scheme of the embodiment of the invention, when an attachment request or a cross-system area update request initiated by user equipment is received, whether an SGSN address is stored in a Home Subscriber Server (HSS) is determined; the attach request or the cross-system area update request carries 4G non-access stratum information; if yes, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 2/3/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a first called domain selection method according to an embodiment of the present invention;

fig. 2 is a flow chart of a second called domain selection method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an application scenario of a called domain selection method according to an embodiment of the present invention;

fig. 4 is a flow chart of a third called domain selection method according to an embodiment of the present invention;

fig. 5 is a flow chart of a fourth called domain selection method according to an embodiment of the present invention;

fig. 6 is a schematic block diagram of a mobility management entity MME device according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of a home subscriber server HSS according to an embodiment of the invention;

Fig. 8 is a schematic structural diagram of a first electronic device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

Fig. 1 is a flow chart of a called domain selection method according to an embodiment of the present invention.

Referring to fig. 1, the called domain selection method includes steps S102 and S104. The called domain selection method is applied to a Mobility Management Entity (MME). The called domain selection method in the exemplary embodiment of fig. 1 is described in detail as follows.

A mobility management entity, MME (Mobility Management Entity ). The MME is a key control node of a 3GPP (3 rd Generation Partnership Project, third generation partnership project) protocol LTE (Long Term Evolution ) access network, which is responsible for the positioning of idle mode user equipment, paging procedures including relay, simply called MME, responsible for the signaling handling part.

Step S102, when receiving an attachment request or a cross-system area update request initiated by user equipment, determining whether an SGSN address is stored in a Home Subscriber Server (HSS); the attach request or cross-system area update request carries 4G non-access stratum information.

The User Equipment is UE (User Equipment).

The Attach request is an Attach request in an Attach flow, which is attached to the 4G network. Attachment, it is understood that the UE registers in the PLMN (Public Land Mobile Network ) to establish its own profile.

Three cases of attachment were performed, including: the attachment after the UE is started, namely the initial attachment; the UE needs to attach when returning from coverage hole to coverage area; the UE has no SIM card before and later insertion of the SIM card requires attachment.

The cross-system area update request may be an RAU (Route Area Update, routing area update) request in an Inter-system RAU (Inter systemRoute Area Update, cross-system handover routing area update) flow. The Inter system RAU procedure is typically performed when the UE is handed over from the 2/3G network to the 4G network. The RAU request carries 4G NAS information.

The attach request or the cross-system area update request carries 4G non-access stratum information. The Non-Access-Stratum information is NAS (Non-Access-Stratum) information.

The home subscriber server, HSS (Home Subscriber Server), home subscriber server).

Addresses stored in the HSS in an application scenario of the called domain selection method are described below in connection with fig. 3.

Fig. 3 is a schematic diagram of an application scenario of a called domain selection method according to an embodiment of the present invention.

In some embodiments, the UE is located in a 4G network and has not previously passed through a 2/3G network, typically the HSS has only the MME address stored therein and has not the SGSN (Serving GPRS Support Node ) address stored therein, wherein GPRS is GPRS (General packet radio service ).

Referring to fig. 3, the user equipment, UE310, the mobility management entity 1, MME304, the home subscriber server, HSS302. When the UE310 is in the 4G network and does not pass through the 2/3G network, the UE310 interacts with the HSS302 through the MME304, and at this time, only the MME address and not the SGSN address are stored in the HSS302.

In some embodiments, when the UE is located in the 4G network first and then moves to the 2/3G network, the UE performs Attach procedure or Inter system TAU (Inter system Tracking Area Update, cross system handover tracking area update) procedure of the 2/3G network. When the flow conflict causes that the flow of the user in 2/3G is not completely ended, or the UE fails, namely 2/3/4G interaction abnormality occurs, the SGSN updates the SGSN address to the HSS, but the UE side cannot effectively exist 2/3G NAS information. At this time, the HSS does not need to send cancel location signaling to the MME since the user goes from 4G to 2/3G, so SGSN and MME addresses are simultaneously stored in the HSS at this time.

Referring to fig. 3, a serving general packet radio service support node, SGSN306. When the UE310 is located in the 4G network and then moves to the 2/3G network, the UE310 performs an Attach procedure or an Inter system TAU procedure of the 2/3G network. At this time, a 2/3/4G interworking abnormality occurs, which causes the SGSN306 to update the SGSN address to the HSS302, and the MME address is not deleted in the HSS302, so the SGSN address and the MME address are stored in the HSS302 at the same time.

In some embodiments, when the UE is located in the 4G network, moves to the 2/3G network, and returns to the 4G network, the UE performs Attach procedure or Inter system RAU procedure of the 4G network. Since the UE side cannot effectively have 2/3G NAS information, NAS information carried by the UE side still is initially acquired in the 4G network, that is, NAS information acquired by the UE before moving to the 2/3G network.

Referring to fig. 3, the mobility management entity 2, i.e., MME308. When the UE310 is located in the 4G network, moves to the 2/3G network, and moves from the 2/3G network to the 4G network, the UE310 performs an Attach procedure or an Inter system RAU procedure of the 4G network. At this time, the Attach request or RAU request sent by the UE310 carries NAS information of 4G acquired before the UE310 moves to the 2/3G network. MME308 determines that the NAS information is still 4G information and considers UE310 to be a valid user in 4G. Thus, MME308 does not send a ULR (Update Location Request ) to HSS302, or MME308 sends a ULR but the target cell in the ULR corresponding to the Attach request or RAU request is not reset to the initial value, resulting in HSS302 not deleting the SGSN address. Therefore, the SGSN address and the MME address are stored in the HSS302 at the same time.

In this scenario, although the UE310 is in the 4G network, since the SGSN address and the MME address are stored in the HSS302 at the same time, the called domain selection result determined by the HSS302 according to the SGSN address and the MME address matches the 2/3G network, not the called domain selection result matching the 4G network.

The determination method of the called domain selection result needs to be described in a supplementary way:

(1) If there is registration information of the user at the SGSN, the called domain should select the CS domain regardless of whether the user is registered at the MME, which may be understood that if the SGSN address and the MME address are stored in the HSS at the same time, the called domain selection result matches with the 2/3G network.

(2) If there is no registration information of the user at the SGSN and there is registration information of the user at the MME, the HSS queries the MME for the user status and the terminal capability. If there is user attach information in the MME and the terminal supports SRVCC (Single Radio Voice Call Continuity ), the IMS domain should be selected. If the MME has no user attach information, the CS domain should be selected. It can be understood that if only the MME address is stored in the HSS and the HSS address is not stored, the HSS determines a called domain selection result according to the user status and the terminal capability queried from the MME, where the called domain selection result is matched with the 4G network.

(3) If there is no registration information of the user at the SGSN and no registration information of the user at the MME, the called domain should select the CS domain, which can be understood that if the SGSN address and the MME address are not stored in the HSS, the called domain selection result matches with the 2/3G network.

Referring to the method for determining the called domain selection result, if the UE is located in the 4G network and the SGSN address and the MME address are stored in the HSS at the same time under the condition that the 2/3/4G interaction anomaly occurs, the called domain selection result determined by the HSS is matched with the 2/3G network, and the called domain selection result is obviously inaccurate.

The MME may determine, when receiving a UE-initiated attach request or a cross-system area update request, whether an SGSN address is stored in the HSS through a preset system state variable.

Optionally, before determining whether the SGSN address is stored in the home subscriber server HSS, the method further includes: setting a system state variable, and setting the value of the system state variable as an initial value; the system state variable comprises an initial value and a target value, wherein when the system state variable is the initial value, the HSS does not store the SGSN address, and when the system state variable is the target value, the HSS stores the SGSN address; when receiving an SGSN context request or an identity authentication request sent by an SGSN, updating the value of a system state variable from an initial value to a target value; after sending the address deletion instruction to the HSS, further comprising: and updating the value of the system state variable from the target value to the initial value.

System state variables are set in the MME. The system state variable values include an initial value and a target value, where the initial value may take a value of 0 and the target value may take a value of 1, which is only an example, and the initial value and the target value may be other customized values or characters. When the value of the system state variable is 0, the SGSN address is not stored in the HSS; when the value of the system state variable is 1, the SGSN address is stored in the HSS.

In one embodiment, a boolean type variable may be set up within the MME as a SYSTEM state variable, which may be named inter_system_status, just to name one example. The system state variable may be another type of variable, and the present invention is not limited in particular. This variable is used to record whether the UE has reached the 2/3G state, i.e. whether the SGSN address is likely to be stored in the HSS. When judging that the UE goes to 2/3G before the signaling flow, namely the SGSN address is possibly stored in the HSS, the MME updates the variable to 1; when it is determined that the user has not reached 2/3G before this signaling flow, i.e. the SGSN address is not possible to store in the HSS, the MME updates the variable to 0.

In one embodiment, when the user initially attaches to the MME, the value of the system state variable is set to an initial value, i.e., 0; when the UE performs an inter system TAU procedure or an atach procedure of 2/3G, which is interacted with the MME, that is, when the MME receives the SGSN sending SGSN context request SGSN context request or the identity authentication request Identification request, the value of the system state variable is updated from the initial value 0 to the target value 1.

It will be appreciated that when the MME receives the SGSN send SGSN context request SGSN context request or the identity authentication request Identification request, the UE is located in the 2/3G network, and the SGSN address is stored in the HSS, so that the value of the system state variable is updated from the initial value 0 to the target value 1.

It should be noted that when the MME receives the SGSN context request or the identity authentication request sent by the SGSN, the SGSN address may not be actually stored in the HSS, but the time interval between the step of receiving the SGSN context request or the identity authentication request by the MME and the step of obtaining the SGSN address by the HSS is very short and can be ignored, so it can be considered that when the value of the system state variable is updated from the initial value 0 to the target value 1, the SGSN address is stored in the HSS.

When the UE returns to 4G again, the UE performs an inter system RAU procedure interacted with the MME or an atach procedure of 4G. When the UE executes the ATTACH flow of 4G, if the MME is determined to send ULR carrying the target cell Initial-ATTACH-Indicator corresponding to the ATTACH request after reset to the HSS, the value of the system state variable is updated from the target value 1 to the Initial value 0. Or when the UE executes the inter system RAU flow, if the MME is determined to send ULR carrying a target cell Single-registration-Indication corresponding to the RAU request after reset to the HSS, the value of the system state variable is updated from a target value 1 to an initial value 0.

It can be understood that, when the MME sends the ULR carrying the reset target cell Initial-Attach-Indicator corresponding to the Attach request or the reset target cell Single-registration-Indication corresponding to the RAU request to the HSS, the target cell is used to trigger the HSS to delete the SGSN address originally stored, and after deleting the SGSN address, the SGSN address is not stored in the HSS, so that the value of the system state variable is updated from the target value 1 to the Initial value 0. Reset is understood to mean the updating of a target cell to its initial value.

It should be noted that, although the HSS has not deleted the SGSN address when the MME transmits the ULR, the time interval between the step of the MME transmitting the ULR and the step of the HSS deleting the SGSN address is very small and can be ignored, so that it can be considered that the SGSN address is not stored in the HSS when the value of the system state variable is updated from the target value 1 to the initial value 0.

Optionally, determining whether the SGSN address is stored in the home subscriber server HSS includes: reading a system state variable; if the value of the system state variable is an initial value, determining that the SGSN address is not stored in the HSS; if the value of the system state variable is the target value, determining that the SGSN address is stored in the HSS.

The MME may determine whether the SGSN address is stored in the HSS by reading the value of the system state variable. For example, when the value of the system state variable is an initial value of 0, determining that the SGSN address is not stored in the HSS; when the value of the system state variable is the target value 1, determining that the SGSN address is stored in the HSS.

If the MME determines that the SGSN address is not stored in the HSS, the MME can process according to the current 4G internal standard flow, and the obtained called domain selection result is accurate. If the MME determines that the SGSN address is stored in the HSS, step S104 is executed.

In another embodiment, if the attachment request or the cross-system area update request initiated by the user equipment and received by the MME is not NAS information of 4G but NAS information of 2/3G, the processing is performed according to the current specification 23/4G interoperation procedure, and the obtained called domain selection result is accurate.

Step S104, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information.

In one embodiment, if the value of the system state variable read by the MME is the target value 1, it is determined that the SGSN address is stored in the HSS. In combination with the application scenario shown in fig. 3, both MME addresses and SGSN addresses are stored in the HSS. The MME sends an address deletion instruction to the HSS, which instructs the HSS to delete the SGSN address. After deleting the SGSN address by the address deleting instruction, the HSS only stores the MME address, and the called domain selection result determined by the HSS according to the MME address is matched with the 4G network, namely, the 4G NAS information.

By deleting the SGSN address stored in the HSS, the called domain selection result determined by the HSS according to the MME address can be matched with the 4G network, and the problem of low switching-on success rate of the VOLTE user caused by the fact that the called domain selection result determined in the 4G network is matched with the 2/3G network is avoided.

Optionally, the address deletion instruction includes a location update request ULR; transmitting an address deletion instruction to the HSS, the address deletion instruction being configured to instruct the HSS to delete the SGSN address, including: determining a target cell corresponding to the attach request or the cross-system area update request and resetting; transmitting ULR to HSS; ULR carries the target cell after reset; the reset target cell is used for triggering the HSS to send a position cancel request to the SGSN, and the HSS deletes the SGSN address according to the position cancel response information returned by the SGSN.

When the UE returns to 4G again, the UE performs an inter system RAU procedure interacted with the MME or an atach procedure of 4G.

According to the ATTACH request in the ATTACH process of 4G, determining the target cell corresponding to the ATTACH request as an Initial-ATTACH-Indicator. According to the RAU request in the inter system RAU flow, the target cell corresponding to the RAU request is determined to be Single-registration-Indication.

The target cell is reset, i.e., updated to its Initial value, by either the Initial-Attach-Indicator or the Single-registration-Indicator.

When the UE executes the ATTACH flow of 4G, the MME transmits ULR carrying the reset target cell Initial-ATTACH-Indicator corresponding to the ATTACH request to the HSS, or when the UE executes the inter system RAU flow, the MME transmits ULR carrying the reset target cell Single-registration-Indicator corresponding to the RAU request to the HSS.

The reset target cell Initial-Attach-Indicator, or the reset target cell Single-registration-Indication, is used for triggering the HSS to send a location Cancel request Cancel Lotion Request to the SGSN, and the HSS deletes the SGSN address according to location Cancel response information cancer Lock returned by the SGSN.

According to the called domain selection method in the example embodiment of fig. 1, when an attach request or a cross-system area update request initiated by a user equipment is received, it is determined whether an SGSN address is stored in a home subscriber server HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; if yes, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 23/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

Fig. 2 is a flow chart of a second called domain selection method according to an embodiment of the present invention.

The called domain selection method is applied to a home subscriber server HSS. Referring to fig. 2, the called domain selection method includes step S202, step S204 and step S206, and the called domain selection method in the exemplary embodiment of fig. 2 is described in detail below.

Step S202, an address deleting instruction sent by a mobility management entity MME is obtained; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores SGSN addresses and MME addresses.

The User Equipment is UE (User Equipment).

In connection with the application scenario shown in fig. 3, in some embodiments, the UE is located in a 4G network and has not previously passed through a 2/3G network, typically the HSS has only an MME address stored therein and has not stored therein an SGSN (Serving GPRS Support Node ) address, wherein GPRS is GPRS (General packet radio service ).

In one embodiment, the HSS moves from the 4G network to the 2/3G network and then from the 2/3G network to the 4G network, and due to the occurrence of the 2/3/4G interaction anomaly in the middle, the HSS stores the MME address and the SGSN address at the same time, and the Attach request in the 4Gd Attach procedure or the RAU request in the Inter system RAU procedure initiated by the user equipment received by the MME carries the 4G NAS information. At this time, the MME acquires an address deletion instruction sent by the MME for instructing the HSS to delete the SGSN address from the HSS.

Step S204, deleting the SGSN address according to the address deleting instruction.

And when receiving an address deleting instruction sent by the MME, the HSS deletes the stored SGSN address.

Optionally, the address deletion instruction includes a location update request ULR; the ULR carries a reset target cell corresponding to an attach request or a cross-system area update request; deleting the SGSN address according to the address deleting instruction comprises the following steps: transmitting a position cancel request to the SGSN according to the reset target cell; acquiring position cancellation response information returned by the SGSN; and deleting the SGSN address according to the position cancellation response information.

When the request received by the MME is an Attach request, the ULR (Update Location Request ) carries a target cell Initial-Attach-Indicator corresponding to the Attach request. When the request received by the MME is an RAU request, the ULR carries a target cell Single-registration-Indication corresponding to the RAU request.

The HSS sends a location cancel request to the SGSN according to the reset target cell, and it can be understood that the HSS sends a location cancel request Cancel Lotion Request to the SGSN when receiving the target cell. After transmitting the location cancel request to the SGSN, the HSS acquires location cancel response information Cancel Lotion Ack returned by the SGSN. The HSS deletes the SGSN address according to the location cancel response information, which may be understood as deleting the SGSN address originally stored when the HSS receives the location cancel response information.

Step S206, the called domain selection result is determined according to the MME address, so that the called domain selection result is matched with the 4G non-access stratum information.

After deleting the SGSN address by the address deleting instruction, the HSS only stores the MME address, and the called domain selection result determined by the HSS according to the MME address is matched with the 4G network, namely, the 4G NAS information.

According to the called domain selection method in the example embodiment of fig. 2, an address deletion instruction sent by a mobility management entity MME is obtained; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores an SGSN address and an MME address; deleting the SGSN address according to the address deleting instruction; and determining a called domain selection result according to the MME address, so that the called domain selection result is matched with the 4G non-access stratum information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 23/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

Fig. 4 is a flow chart of a third called domain selection method according to an embodiment of the present invention.

Step S402, judging whether the mobility management entity receives the context request or the identity authentication request.

If yes, go to step S404; if not, go to step S406.

In step S404, the value of the system state variable is updated to 1.

In step S406, the value of the system state variable remains unchanged.

Step S408, it is determined whether the mobility management entity sends a location update request carrying the reset target cell to the home subscriber server.

If yes, go to step S410; if not, go to step S412.

In step S410, the value of the system state variable is updated to 0.

In step S412, the value of the system state variable is kept constant at 1.

The called domain selection method provided by the embodiment shown in fig. 4 can implement the respective processes in the foregoing called domain selection method embodiment, and achieve the same functions and effects, which are not repeated here.

Fig. 5 is a flowchart of a fourth called domain selection method according to an embodiment of the present invention.

Step S502, judging whether an attach request or a cross-system area update request initiated by user equipment carrying 4G non-access layer information is received.

If yes, go to step S504.

Step S504, judging whether the value of the system state variable is 1.

If yes, go to step S506.

Step S506, the position updating request carrying the reset target cell is sent to the home subscriber server.

The called domain selection method provided by the embodiment shown in fig. 5 can implement the respective processes in the foregoing called domain selection method embodiment, and achieve the same functions and effects, which are not repeated here.

Fig. 6 is a schematic block diagram of a mobility management entity MME device according to an embodiment of the present invention.

Referring to fig. 6, the MME apparatus includes:

an address determining module 602, configured to determine, when an attach request or a cross-system area update request initiated by a user equipment is received, whether an SGSN address is stored in a home subscriber server HSS; the attach request or the cross-system area update request carries 4G non-access stratum information;

if yes, the instruction sending module 604 is operated, and the instruction sending module 604 is used for sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information.

In some embodiments of the present invention, based on the above scheme, the MME device further includes:

the variable setting module is used for setting a system state variable and setting the value of the system state variable as an initial value; the system state variable comprises an initial value and a target value, wherein when the system state variable is the initial value, the HSS does not store the SGSN address, and when the system state variable is the target value, the HSS stores the SGSN address;

the target value updating module is used for updating the value of the system state variable from an initial value to a target value when receiving an SGSN context request or an identity authentication request sent by an SGSN;

and the initial value updating module is used for updating the value of the system state variable from the target value to the initial value.

In some embodiments of the present invention, based on the above scheme, the address determining module 602 is specifically configured to:

reading a system state variable;

if the value of the system state variable is an initial value, determining that the SGSN address is not stored in the HSS;

if the value of the system state variable is the target value, determining that the SGSN address is stored in the HSS.

In some embodiments of the invention, based on the above-described scheme, the address deletion instruction includes a location update request ULR; the instruction sending module 604 is specifically configured to:

Determining a target cell corresponding to the attach request or the cross-system area update request and resetting;

transmitting ULR to HSS; ULR carries the target cell after reset; the reset target cell is used for triggering the HSS to send a position cancel request to the SGSN, and the HSS deletes the SGSN address according to the position cancel response information returned by the SGSN.

According to the technical scheme of the embodiment of the invention, when an attachment request or a cross-system area update request initiated by user equipment is received, whether an SGSN address is stored in a Home Subscriber Server (HSS) is determined; the attach request or the cross-system area update request carries 4G non-access stratum information; if yes, sending an address deleting instruction to the HSS; the HSS stores MME address and SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 23/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

The MME device provided in an embodiment of the present invention can implement each process in the foregoing called domain selection method embodiment, and achieve the same functions and effects, which are not repeated here.

Fig. 7 is a schematic block diagram of a home subscriber server HSS according to an embodiment of the invention.

Referring to fig. 7, the HSS includes:

an instruction obtaining module 702, configured to obtain an address deletion instruction sent by a mobility management entity MME; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores an SGSN address and an MME address;

an address deleting module 704, configured to delete the SGSN address according to the address deleting instruction;

the called domain determining module 706 is configured to determine a called domain selection result according to the MME address, so that the called domain selection result matches with the 4G non-access stratum information.

In some embodiments of the invention, based on the above-described scheme, the address deletion instruction includes a location update request ULR; the ULR carries a reset target cell corresponding to an attach request or a cross-system area update request; the address deletion module 704 is specifically configured to:

Transmitting a position cancel request to the SGSN according to the reset target cell;

acquiring position cancellation response information returned by the SGSN;

and deleting the SGSN address according to the position cancellation response information.

According to the technical scheme of the embodiment of the invention, an address deleting instruction sent by a Mobility Management Entity (MME) is obtained; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that the SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores an SGSN address and an MME address; deleting the SGSN address according to the address deleting instruction; and determining a called domain selection result according to the MME address, so that the called domain selection result is matched with the 4G non-access stratum information. By the technical scheme of the embodiment of the invention, the accuracy of user source positioning can be improved under the condition that the user equipment experiences 23/4G interaction abnormality, so that the accuracy of the called domain selection result is improved, the called domain selection result of the user equipment in the 4G network is matched with the 4G network, and the success rate of switching on the long term evolution voice-bearing VOLTE user is improved.

The HSS provided by an embodiment of the present invention can implement each process in the foregoing called domain selection method embodiment, and achieve the same functions and effects, which are not repeated here.

Further, in the embodiment of the present application, an electronic device is further provided, and fig. 8 is a schematic structural diagram of a first electronic device provided in an embodiment of the present application, as shown in fig. 8, where the device includes a memory 801, a processor 802, a bus 803, and a communication interface 804. The memory 801, processor 802, and communication interface 804 communicate over bus 803, and communication interface 804 may include input output interfaces including, but not limited to, a keyboard, mouse, display, microphone, loudspeaker, and the like.

In fig. 8, memory 801 has stored thereon computer executable instructions that, when executed by processor 802, enable the following flow to be achieved:

Optionally, the computer executable instructions, when executed by the processor 802, before determining whether the SGSN address is stored in the home subscriber server HSS, further comprise:

setting a system state variable, and setting the value of the system state variable as an initial value; the system state variable comprises an initial value and a target value, wherein when the system state variable is the initial value, the HSS does not store the SGSN address, and when the system state variable is the target value, the HSS stores the SGSN address;

when receiving an SGSN context request or an identity authentication request sent by an SGSN, updating the value of a system state variable from an initial value to a target value;

after sending the address deletion instruction to the HSS, further comprising:

and updating the value of the system state variable from the target value to the initial value.

Optionally, the computer executable instructions, when executed by the processor 802, determine whether the SGSN address is stored in the home subscriber server HSS, comprising:

reading a system state variable;

Optionally, the computer-executable instructions, when executed by the processor 802, the address deletion instructions comprise a location update request ULR; transmitting an address deletion instruction to the HSS, the address deletion instruction being configured to instruct the HSS to delete the SGSN address, including:

The electronic device provided by the embodiment of the application can realize each process in the called domain selection method embodiment and achieve the same functions and effects, and is not repeated here.

Further, embodiments of the present application also provide a computer readable storage medium having stored therein computer executable instructions that, when executed by the processor 802, enable the following flow to be achieved:

after sending the address deletion instruction to the HSS, further comprising:

reading a system state variable;

The computer readable storage medium according to an embodiment of the present invention can implement the processes in the foregoing called domain selection method embodiment, and achieve the same functions and effects, which are not repeated here.

Among them, the computer readable storage medium is Read-Only Memory (ROM), random access Memory (Random Access Memory RAM), magnetic disk or optical disk, etc.

The embodiment of the present application further provides another electronic device, and fig. 9 is a schematic structural diagram of a second electronic device according to an embodiment of the present application, where, as shown in fig. 9, the device includes a memory 901, a processor 902, a bus 903, and a communication interface 904. The memory 901, processor 902, and communication interface 904 communicate over a bus 903, and the communication interface 904 may include input-output interfaces including, but not limited to, a keyboard, mouse, display, microphone, loudspeaker, and the like.

In fig. 9, memory 901 has stored thereon computer executable instructions that, when executed by processor 902, enable the following flow to be achieved:

deleting the SGSN address according to the address deleting instruction;

Optionally, the computer-executable instructions, when executed by the processor 902, the address deletion instructions comprise a location update request ULR; the ULR carries a reset target cell corresponding to an attach request or a cross-system area update request; deleting the SGSN address according to the address deleting instruction comprises the following steps:

acquiring position cancellation response information returned by the SGSN;

Further, embodiments of the present application also provide a computer readable storage medium having stored therein computer executable instructions that, when executed by the processor 902, enable the following flow to be achieved:

deleting the SGSN address according to the address deleting instruction;

acquiring position cancellation response information returned by the SGSN;

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a computer readable storage medium (such as ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method of the above-mentioned embodiments of the present invention.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims

1. The called domain selection method is applied to a Mobility Management Entity (MME), and is characterized by comprising the following steps:

setting a system state variable, and setting the value of the system state variable as an initial value; the system state variable value comprises the initial value and a target value, wherein when the system state variable value is the initial value, the SGSN address is not stored in the HSS, and when the system state variable value is the target value, the SGSN address is stored in the HSS;

when receiving an SGSN context request or an identity authentication request sent by an SGSN, updating the value of the system state variable from the initial value to the target value;

If yes, sending an address deleting instruction to the HSS; the HSS stores an MME address and the SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information;

2. The method of claim 1, wherein determining whether the SGSN address is stored in the home subscriber server HSS comprises:

reading the system state variable;

if the value of the system state variable is the initial value, determining that the SGSN address is not stored in the HSS;

and if the value of the system state variable is the target value, determining that the SGSN address is stored in the HSS.

3. The method of claim 1, wherein the address deletion instruction comprises a location update request ULR; sending an address deletion instruction to the HSS, where the address deletion instruction is configured to instruct the HSS to delete the SGSN address, and includes:

Transmitting the ULR to the HSS; the ULR carries the reset target cell; and the reset target cell is used for triggering the HSS to send a position cancel request to the SGSN, and the HSS deletes the SGSN address according to position cancel response information returned by the SGSN.

4. A called domain selection method applied to a home subscriber server HSS, comprising:

acquiring an address deleting instruction sent by a Mobility Management Entity (MME); the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that an SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores the SGSN address and the MME address;

deleting the SGSN address according to the address deleting instruction;

5. The method of claim 4, wherein the address deletion instruction comprises a location update request ULR; the ULR carries a reset target cell corresponding to the attach request or the cross-system area update request; deleting the SGSN address according to the address deleting instruction, including:

acquiring position cancellation response information returned by the SGSN;

6. A mobility management entity MME device, comprising:

the variable setting module is used for setting a system state variable and setting the value of the system state variable as an initial value; the system state variable value comprises the initial value and a target value, wherein when the system state variable value is the initial value, the SGSN address is not stored in the HSS, and when the system state variable value is the target value, the SGSN address is stored in the HSS;

a target value updating module, configured to update, when receiving an SGSN context request or an identity authentication request sent by an SGSN, a value of the system state variable from the initial value to the target value;

If yes, an instruction sending module is operated, and the instruction sending module is used for sending an address deleting instruction to the HSS; the HSS stores an MME address and the SGSN address; the address deleting instruction is used for indicating the HSS to delete the SGSN address, so that the called domain selecting result determined by the HSS according to the MME address after deleting the SGSN address is matched with the 4G non-access layer information;

7. A home subscriber server, HSS, comprising:

the instruction acquisition module is used for acquiring an address deletion instruction sent by the mobility management entity MME; the address deleting instruction is sent when the MME receives an attachment request or a cross-system area updating request initiated by user equipment and the MME determines that an SGSN address is stored in the HSS; the attach request or the cross-system area update request carries 4G non-access stratum information; the HSS stores the SGSN address and the MME address;

and the called domain determining module is used for determining a called domain selection result according to the MME address so that the called domain selection result is matched with the 4G non-access layer information.

8. An electronic device comprising a memory and a processor, the memory having stored thereon computer executable instructions that, when executed by the processor, are capable of implementing the called domain selection method of any of the preceding claims 1-3 or any of the preceding claims 4-5.

9. A computer readable storage medium having stored therein computer executable instructions which, when executed by a processor, are capable of implementing the called domain selection method of any of the preceding claims 1-3 or any of the preceding claims 4-5.