CN101247638A - Method and device for multi-mode terminal registration in heterogeneous network - Google Patents

Abstract

The invention discloses a method and a device for registering a multi-mode terminal in a heterogeneous network. The method is as follows: after receiving a request from a multi-mode terminal, a network element of the first network sends a registration message to the HSS; and according to the multi-mode The request type of the terminal, carrying indication information in the registration message, instructing the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to retain the heterogeneous network element information related to the multi-mode terminal; HSS Perform corresponding registration processing according to the indication information. The invention also discloses a method and a device for deregistering a multi-mode terminal in a heterogeneous network. When the invention is used for registration, the HSS can perform different processing for different types of registration requests, and can delete unnecessary information in time while realizing dual-network registration. When the present invention is used for de-registration, the terminal related information on the heterogeneous network element and the heterogeneous network element information in the HSS can be deleted in time, and signaling overhead can be saved.

Description

Method and device for multi-mode terminal registration in heterogeneous network

technical field

The present invention relates to the field of wireless communication, in particular to a method and device for registering a multi-mode terminal in a heterogeneous network.

Background technique

After 3GPP (Third Generation Mobile Communications Standardization Organization) introduces SAE/LTE (System Architecture Evolution/Long Term Evolution) technology, the original 3GPP communication system will coexist with the new technology SAE/LTE for a period of time, and it is under construction In the early stage of the network and for a long period of time, it will be in the state of wide coverage of the original 3GPP communication system and hot spot coverage of the SAE/LTE system. In order to use network resources, in the original 3GPP system and SAE/LTE system, the terminal needs to initiate a registration process to the network, and the network element HSS (Home Subscriber Server, Home Subscriber Server) needs to record the terminal's subscription data and its current location information; After the use of network resources is stopped, the terminal deregisters from the network, and the HSS needs to identify the terminal in the deregistered state.

The registration process in the original 3GPP system (ie 2G/3G system) is as follows:

The terminal initiates an attach process to the SGSN (Serving GPRS Support Node, serving GPRS support node) for registration; the SGSN sends an update GPRS location message to the HSS to update the location information of the terminal in the HSS; the HSS sends the user's subscription data to the SGSN to notify the old The SGSN deletes the information related to the terminal, and replaces the old SGSN with a new SGSN.

If the terminal location moves to a new SGSN (routing area information RAI changes), the terminal initiates a RAU (Routing Area Update, routing area update) process to the new SGSN; the new SGSN also needs to send an update GPRS location message to the HSS, It is used to notify this change; after receiving the message, the HSS performs the same operation as in the above registration process, sends the user's subscription data to the new SGSN, and notifies the old SGSN to delete the information related to the terminal, and uses the new SGSN SGSN replaces the old SGSN. The terminal initiates the RAU process due to location movement, and the process of SGSN registering with the HSS is shown in Figure 1.

Referring to Fig. 1, it is a schematic diagram of the RAU process flow in the prior art 3GPP system, and the specific steps include:

1. The terminal detects a new wireless signal, performs idle state switching, and sends a routing area update request to New SGSN for location update.

2. The New SGSN sends an SGSN context request to the Old SGSN to obtain context information related to the terminal.

3. The Old SGSN returns the SGSN Context Response, carrying the context information of the terminal.

4. Authentication process.

5. New SGSN returns SGSN context confirmation to confirm the acquisition of terminal context information.

6. The New SGSN sends an update PDP (Packet Data Protocol, data packet protocol) context request to the GGSN, requesting to update the PDP context for user plane update.

7. The GGSN returns an update PDP context response.

8. New SGSN sends Update GPRS Location to HSS for location update.

9. The HSS sends Cancel Location to the Old SGSN to notify the Old SGSN to delete the information related to the terminal.

10. Old SGSN returns Cancel Location Ack for confirmation.

11. HSS sends Insert Subscriber Data to New SGSN, and inserts subscriber data into New SGSN.

12. New SGSN returns Insert Subscriber Data Ack to confirm the insertion of subscription data.

13. HSS returns Update GRPS Location Ack to confirm the location update.

14. The SGSN returns Routing Area Update Accept to the terminal to accept the routing area update.

15. The terminal returns Routing Area Update Complete to complete the routing area update.

The de-registration process in the original 3GPP system (ie 2G/3G system) is as follows:

For a terminal successfully registered in the network, it can withdraw from the 2G/3G network through the detach process initiated by the terminal or the network. Go to the registered terminal for identification. The detach process initiated by the terminal is shown in Figure 2.

Referring to FIG. 2, it is a schematic diagram of a Detach process initiated by a terminal in a prior art 3GPP system, and the specific steps include:

1. The terminal sends a Detach Request message to the SGSN, carrying the indication Switch Off, which indicates whether the terminal initiates a detach process due to shutdown.

2a-2b. The SGSN notifies the GGSN to delete the PDP context related to the terminal.

3. The SGSN returns a Detach Accept message to the terminal. If the terminal initiates the detach process due to shutdown, the SGSN does not send the DetachAccept message.

4. After deleting the MM (Mobility Management, mobility management) context and PDP context related to the terminal, the SGSN sends a Purge MS message to the HSS.

5. The HSS identifies the terminal as being purged on the 2G/3G network, and sets the "MS PS Purged for GPRS" flag. When a call or a short message needs to be routed to the identified terminal, the HSS will treat the terminal as unreachable when processing the routing request.

The HSS returns a Purge MS Ack message to the SGSN to confirm success.

The SAE/LTE network includes Evolved RAN (Evolved Radio Access Network), MME/UPE (Mobility Management Entity/User Plane Entity), intersystem mobility anchor (anchor between access systems) modules, where MME is the mobility management module, Responsible for mobility management on the control plane, including user context and mobility status management, assigning temporary user identities, security functions, etc.; UPE is the user plane entity, responsible for initiating paging for downlink data in the idle state, managing and saving IP bearer parameters and network Internal routing information, etc.; the intersystem mobility anchor is the anchor point between 2G/3G and LTE access systems. For 2G/3G networks, its role is equivalent to GGSN (Gateway GPRS Support Node, gateway GPRS support node).

In the SAE/LTE system, the terminal registration process is similar to the registration process in the original 2G/3G system: the terminal needs to initiate the attach process to the MME; the MME sends an update SAE location message to the HSS; the HSS sends the user's location to the new MME Subscription data, inform the old MME to delete the information related to the terminal, and replace the old MME with the new MME.

If the terminal location moves to a new MME (TAI changes), the terminal needs to initiate a location update process TAU to the new MME; the new MME sends an update SAE location message to the HSS to notify the change; the HSS sends the new The old MME sends the subscription data of the user, notifies the old MME to delete the information related to the terminal, and replaces the old MME with a new MME.

In the SAE/LTE system, the de-registration process of the terminal is similar to the de-registration process in the original 2G/3G system: the SAE/LTE system can be exited through the detach process initiated by the terminal or the network. After the terminal exits the network, the MME Delete the information related to it, and notify the HSS to identify the terminal that has been deregistered through a deregistration message (similar to the Purge MS message sent by the SGSN to the HSS).

Dual-mode terminals will perform mobile switching between 2G/3G and SAE/LTE systems. During the handover process, in both 2G/3G and SAE/LTE systems, dual-mode terminals need to perform location registration update on the same HSS, and perform user plane update on the same intersystem mobility anchor. The process of performing location registration update in the HSS is similar to the above-mentioned flow of location registration update.

When the terminal moves between different RATs, the terminal will change and reside in different networks, which frequently causes the network registration process. The frequent network registration process is a great waste of the air interface. For example, if the terminal enters the 2G/3G routing area RA1, it will register with the 2G/3G SGSN; when the terminal enters the SAE/LTE tracking area TA1, it will register with the MME of the SAE/LTE system; RA1 needs to register with the 2G/3G SGSN. The purpose of registration is to enable the network to page the terminal in a certain RAT, but it brings a lot of registration signaling overhead. Therefore, it is necessary to impose signaling restrictions on the handover between different RATs (Radio Access Technology) between SAE/LTE and 2G/3G networks.

In the specification document TR23.882 of 3GPP SAE, a solution is proposed to reduce the impact on the air interface of the registration/update of the terminal in the idle mode under the inter RAT. The idea of this solution is that the terminal attaches and registers to an access network (2G/3G network or SAE/LTE system), and then the terminal moves to another access network and then registers to another access network. In this way, the terminal After being registered to two access systems at the same time, the terminal moves in the corresponding registration areas (RA or TA) of the two networks without initiating any registration process, but only initiates a common location update process. The two access systems (SGSN of 2G/3G or MME of SAE/LTE system) to which the terminal is registered have the context of the terminal.

Referring to FIG. 3 , it is a schematic flow diagram of a dual-mode terminal first attaching to the SAE/LTE system in the prior art, and then moving to the 2G/3G system. The specific steps include:

1. The terminal attaches to SAE/LTE and sends an attach request message to the MME.

2a-2b. The MME initiates an authentication process to the terminal, and the terminal returns an authentication response to the MME.

3a-3b. The MME registers with the HSS, that is, the MME sends the Update SAE Location location update process to the HSS.

4. The MME/UPE confirms that the terminal is successfully attached, and assigns the terminal S-TMSI and S-RA, as well as information about the default bearer IP.

5. The terminal initiates the RAU process after changing the RAT to 2G/3G, and carries the S-TMSI/S-RA allocated by the MME to the SGSN.

6a-6b. The SGSN initiates an SGSN Context Request message to the MME corresponding to the S-TMSI/S-RA to request the context information of the terminal; the MME sends the relevant context to the SGSN upon receiving it.

7. Possible certification process;

8a-8b. The SGSN registers with the HSS.

9. SGSN confirms context acceptance, which may trigger MME/UPE to transfer data.

10. The SGSN allocates both U-TMSI/U-RA and S-TMSI/S-RA to the terminal, and the terminal does not need to initiate an update registration message when moving between U-RA and S-RA.

11. RA update confirmation.

Referring to FIG. 4 , it is a schematic flow diagram of a terminal first registering to a 2G/3G system in the prior art, and then moving to an SAE/LTE system. This flow is similar to the flow shown in FIG. 3 , and is briefly described as follows:

The terminal first attaches to the SGSN, and the SGSN registers with the HSS; after that, the terminal enters the SAE/LTE, initiates the TAU process, obtains the context from the SGSN, registers with the MME to the HSS, and assigns the S-RA/S-TMSI to the terminal; Movement within RA and S-RA does not need to initiate location update/registration messages. When the terminal moves to an area other than the registered S-RA/RA, it needs to initiate an update message. Step 2 below step 14 in the above figure may not be initiated because the SGSN has not been replaced.

In the above process, the HSS needs to record the information of the MME and the SGSN at the same time. The specific operation process is: after receiving the update GPRS location message, the HSS replaces the old SGSN information with the new SGSN information, and notifies the old SGSN to delete the information; after receiving the update SAE location message, the HSS replaces the old SGSN information with the new MME information MME information, and notify the old MME to delete the information. That is, in HSS, the information of SGSN and MME is independent of each other, and there is no mutual replacement relationship between heterogeneous network elements. When HSS receives a location update message, it will only notify the corresponding old network element to delete the information, and will not notify the old heterogeneous network. element to delete information. The UE registers with the SGSN and changes the RA, which will trigger the SGSN to send an update GPRS location message to the HSS; similarly, the UE registers with the MME and changes the TA, and will trigger the MME to send an update SAE location message to the HSS. In the prior art, the HSS does not handle differently the location update messages received under two different situations of registration and location change.

When the UE in the dual-network registration state is located in the single network and shuts down abnormally without the detach process, after the UE is powered on, in the attach registration process initiated by the UE, the HSS uses only the network element that sent the location update message according to the location update message The information replaces the old network element information in the same system. At this time, the HSS also stores the network element information of another network, and the network element of the other network stores the information of the UE. When the UE in the dual-network registration state is located in the single network, it is normally shut down through the detach process, and after the UE is powered on in the network of the same system as when it was shut down, in the attach registration process initiated by the UE, the HSS updates the message according to the location, and only saves the The information of the network element that initiates the location update message. At this time, the HSS also stores the information of the network element of another network, and the network element of the other network stores the information of the UE.

In the above cases, the UE-related information is retained on the heterogeneous network element that the terminal registered last time. This information is invalid when the terminal re-attachs, and needs to be deleted to correctly reflect the routing information with the terminal. .

Regarding the de-registration process of the terminal in the dual-network registration mode, the current prior art does not pay much attention to the de-registration process of the terminal in the dual-network registration mode. The de-registration process in the single-network registration mode: HSS receives The Purge MS message from the SGSN will only mark the terminal as cleared on the 2G/3G network, and set the "MS PS Purged for GPRS" flag; after receiving the de-registration message (similar to Purge MS) from the MME, the HSS will Identified as being cleared in SAE/LTE networks. When a terminal in dual-network registration mode shuts down in a single-network coverage area, the terminal-related information stored on heterogeneous network elements cannot be deleted in time because the detach process is only initiated on The heterogeneous network element information cannot be deleted in time. At this time, the terminal is already in an unreachable state. When there is a call or a short message that needs to be routed to the terminal, the heterogeneous network element and the HSS cannot correctly and timely transfer the unreachable information of the terminal. to respond. In addition, if a terminal in the dual-network registration mode shuts down in the dual-network coverage area, it needs to initiate a similar detach process to both networks, which will cause signaling waste.

Contents of the invention

The embodiment of the present invention provides a method for registering a multi-mode terminal in a heterogeneous network, so as to implement different processing for different types of registration requests by the HSS, and delete unnecessary information in time while realizing dual-network registration. The method includes the following steps:

After receiving the request from the multi-mode terminal, the network element of the first network sends a registration message to the HSS; and according to the request type of the multi-mode terminal, carries indication information in the registration message, instructing the HSS to notify the heterogeneous network element to delete Information related to the multi-mode terminal, or instructing the HSS to retain heterogeneous network element information related to the multi-mode terminal; the HSS receives the registration message, and performs corresponding registration processing according to the indication information.

Another embodiment of the present invention provides a device for initiating registration, which includes:

a receiving unit, configured to receive a detach request message sent by a multimode terminal;

An indication information setting unit, configured to determine the reason for the detachment of the multimode terminal according to the detachment request message received by the receiving unit, and set indication information according to the reason, and instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to retain heterogeneous network element information related to the multi-mode terminal;

A sending unit, configured to carry the indication information set by the indication information setting unit in a de-registration message sent to the HSS, and send the de-registration message.

Another embodiment of the present invention provides an HSS registration device, which includes:

The receiving unit is configured to receive a registration message, the registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiates the registration process, or instructs the HSS to retain information related to the multi-mode terminal Terminal-related heterogeneous network element information;

an obtaining unit, configured to obtain the indication information from the receiving unit;

The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for notifying heterogeneous network elements to delete information related to the multi-mode terminal:

Notify the network element in the same network as the network element that sent the registration message and the network element in the heterogeneous network that the multimode terminal registered last time, delete the information related to the multimode terminal; delete the Information about the network elements in the same network and the network elements in the heterogeneous network in the HSS; and saving the information about the network element sending the registration message;

The second processing unit is configured to perform the following processing according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal obtained by the obtaining unit:

Notify the network element in the same network as the network element that sent the registration message that the multimode terminal registered last time, delete the information related to the multimode terminal; delete the network element in the same network in the HSS and save the information of the network element that sends the registration message.

In the above embodiments of the present invention, the HSS can register in the heterogeneous network according to the type of the registration request, and at the same time prevent the terminal-related information stored on the old network element related to the terminal from being deleted in time , and prevent the HSS from storing unnecessary information.

Another embodiment of the present invention provides a method for de-registering a multi-mode terminal in a heterogeneous network to timely delete terminal-related information on heterogeneous network elements and heterogeneous network element information in the HSS, and save Signaling overhead. The method includes the following steps:

After receiving the detachment request from the multimode terminal, the network element of the first network sends a deregistration message to the HSS; and

According to the reason for the de-attachment of the multi-mode terminal, carry indication information in the de-registration message, instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to keep the information related to the multi-mode terminal Relevant heterogeneous network element information;

The HSS receives the de-registration message, and performs corresponding de-registration processing according to the indication information.

Another embodiment of the present invention provides a device for de-registration, which includes:

a receiving unit, configured to receive a detach request message sent by a multimode terminal;

An indication information setting unit, configured to determine the reason for the detachment of the multimode terminal according to the detachment request message received by the receiving unit, and set indication information according to the reason, and instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to retain heterogeneous network element information related to the multi-mode terminal;

A sending unit, configured to carry the indication information set by the indication information setting unit in a de-registration message sent to the HSS, and send the de-registration message.

Another embodiment of the present invention provides an HSS de-registration processing device, which includes:

The receiving unit is configured to receive a de-registration message, the de-registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiated the de-registration process, or instruct the HSS to retain information related to the multi-mode terminal that initiated the de-registration process. Describe the heterogeneous network element information related to the multi-mode terminal;

an obtaining unit, configured to obtain the indication information from the receiving unit;

The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for notifying heterogeneous network elements to delete information related to the multi-mode terminal:

Notify the network element in the heterogeneous network that the multimode terminal registered last time to delete the information related to the multimode terminal; delete the information of the heterogeneous network element in the HSS; identify the multimode terminal as being in In the heterogeneous network, and in the network where the network element sending the de-registration message is located is cleared;

The second processing unit is configured to perform the following processing according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal obtained by the obtaining unit:

Identifying the multi-mode terminal as being cleared in the network where the network element sending the de-registration message is located.

In the above-mentioned embodiments of the present invention, the HSS can, according to the reason for the de-registration request, realize timely deletion of the relevant information of the terminal on the heterogeneous network element during the process of de-registration of the multi-mode terminal in the heterogeneous network, and timely delete The information of network elements in the HSS is heterogeneous, and it can save signaling overhead when the terminal in the dual-network registration mode shuts down in the dual-network coverage area.

Description of drawings

FIG. 1 is a schematic diagram of the RAU process in the prior art 3GPP system;

FIG. 2 is a schematic diagram of a Detach process initiated by a terminal in a 3GPP system in the prior art;

FIG. 3 is a schematic flow diagram of a dual-mode terminal first attaching to the SAE/LTE system and then moving to the 2G/3G system in the prior art;

FIG. 4 is a schematic flow diagram of a dual-mode terminal first attaching to a 2G/3G system and then moving to an SAE/LTE system in the prior art;

5 is a schematic flow diagram of a dual-mode terminal first attaching to the 2G/3G system and then moving to the SAE/LTE system in Embodiment 1 of the present invention;

6 is a schematic flow diagram of a dual-mode terminal first attaching to the SAE/LTE system and then moving to the 2G/3G system in Embodiment 1 of the present invention;

FIG. 7 is a schematic diagram of a process in which a dual-mode terminal initiates detachment to an SGSN in Embodiment 4 of the present invention;

FIG. 8 is a schematic structural diagram of a device for initiating registration/de-registration according to Embodiment 6 of the present invention;

FIG. 9 is a schematic structural diagram of an HSS registration/de-registration processing device according to Embodiment 7 of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

This embodiment describes the process of a dual-mode terminal (hereinafter referred to as the terminal) first attaching to the 2G/3G system and then moving to the SAE/LTE system, and the process of first attaching to the SAE/LTE system and then moving to the 2G/3G system. According to the Digister Inhomogenous Network Entity, the HSS realizes the parallel registration of the terminal on the dual network.

Referring to FIG. 5 , it is a schematic flow diagram of a dual-mode terminal attaching to a 2G/3G system and then moving to an SAE/LTE system according to an embodiment of the present invention. The specific steps include:

1. The terminal initiates an attach request to the SGSN, and carries the IMSI in the Attach Request message;

2a-2b. If the identity brought by the terminal is not an IMSI, the new SGSN requests the IMSI from the old SGSN;

3a-3b. If the new SGSN fails to request the IMSI from the old SGSN, the new SGSN will request the IMSI from the terminal;

4. The new SGSN authenticates the identity of the terminal;

5a-5h. The new SGSN sends a registration message to the HSS, carrying the indication to register the heterogeneous network entity in the registration message, and setting the indication value to yes; after the HSS receives the registration message, according to the indication to de-register the heterogeneous network entity , trigger old SGSN and old MME to delete the information of the terminal, delete the addresses of old SGSN and old MME on HSS at the same time, record the address of new SGSN, that is, replace the addresses of old SGSN and old MME with the address of new SGSN; then HSS returns Register response messages.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of new SGSN.

6. The new SGSN sends an Attach Accept message to the terminal;

7. The terminal returns an attach complete message to the new SGSN;

8. The terminal sends a tracking area update message (Track area update) to the new MME, and initiates registration with the SAE/LTE network;

9a-9b. After receiving the message, the MME finds the new SGSN according to the RAI (routing area information), and obtains the context information of the terminal from the new SGSN;

10. The new MME initiates identity authentication for the terminal;

11. The new MME returns a response message after obtaining the context information of the terminal from the new SGSN;

12. The new MME sends a registration message to the HSS, carries an instruction to register a heterogeneous network entity in the registration message, and sets the value of the instruction to no; after receiving the registration message, the HSS triggers the oldMME to delete the terminal information according to the instruction, At the same time, the HSS replaces the old MME address with the new MME address, and returns a registration response message.

If the HSS does not have any MME information before (for example, the terminal moves to the SAE network for the first time), the HSS only needs to record the address of the new MME that initiated the registration request. If the HSS has oldMME information, then the HSS notifies the old MME to delete the information related to the terminal, and replaces the old MME address with the new MME address. The related process is not shown in the figure.

13. The HSS returns a location update response message to the new MME;

14. The new MME sends a tracking area update acceptance message (TA update Accept) to the terminal;

15. The terminal sends a tracking area update complete message (TA update Complete) to the new MME, and the terminal completes the dual-network registration.

Referring to FIG. 6, it is a schematic flow diagram of a dual-mode terminal attaching to an SAE/LTE system and then moving to a 2G/3G system according to an embodiment of the present invention. The specific steps include:

1. The terminal initiates an attach request to the new MME, and carries the IMSI in the Attach Request message;

2a-2b. If the identity identifier brought by the terminal is not IMSI, the new MME requests the IMSI from the old MME;

3a-3b. If the new MME fails to request the IMSI from the old MME, the new MME will request the IMSI from the terminal;

4. The new MME authenticates the identity of the terminal;

5a-5h. The new MME sends a registration message to the HSS, carries the instruction to register the heterogeneous network entity in the registration message, and sets the value of the instruction to yes; after receiving the registration message, the HSS will follow the instruction to register the heterogeneous network entity , trigger old SGSN and old MME to delete the information of the terminal, delete the addresses of old SGSN and old MME on HSS at the same time, record the address of new MME, that is, replace the addresses of old SGSN and old MME with the address of new MME; then HSS returns Register response messages.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of the new MME.

6. The new MME sends an Attach Accept message to the terminal;

7. The terminal returns an attachment completion message to the new MME;

8. The terminal sends a routing area update message (Routing area update) to the new SGSN, and initiates registration with the UMTS network;

9a-9b. After receiving this message, the new SGSN finds the new MME according to the TAI, and obtains the context information of the terminal from the new MME;

10. The new SGSN initiates identity authentication for the terminal;

11. The new SGSN returns a response message after obtaining the context information of the terminal from the new MME;

12. The new SGSN initiates a registration message to the HSS, carries in the registration message the instruction to register the heterogeneous network entity, and sets the value of the instruction to no; after the HSS receives the registration message, it triggers the oldSGSN to delete the terminal information according to the instruction, At the same time, HSS replaces the old SGSN address with the new SGSN address, and returns a registration response message.

If the HSS does not have any SGSN information before (for example, the terminal moves to the 2G/3G network for the first time), the HSS only needs to record the new SGSN information that initiated the registration message. If the HSS has old SGSN information, then the HSS notifies the old SGSN to delete the information related to the terminal, and replaces the old SGSN address with the newSGSN address. The related process is not shown in the figure.

13. The HSS returns a location update response message to the new SGSN;

14. The new SGSN sends a tracking area update acceptance message to the terminal;

15. The terminal sends a tracking area update completion message to the new SGSN, and the terminal completes the dual-network registration.

It can be seen from the process of Embodiment 1 that if the terminal initiates the attach process, the HSS will notify the old network element and heterogeneous The old network element in the network deletes the information related to the terminal, and replaces the information of the old network element in the same network and the old network element in the heterogeneous network with the information of the new network element sending the registration message in the HSS. In this way, the terminal-related information saved on the old network element can be deleted in time, and unnecessary information of the HSS can also be deleted in time.

If the terminal initiates a location update process, the HSS will notify the old network element in the same network as the network element that sent the registration message to delete the information related to the terminal according to the indication of de-registering the heterogeneous network entity with a value of no, and keep the information in the heterogeneous network element. The information related to the terminal, and replace the information of the old network elements in the network with the information of the new network elements in the HSS, and retain the information of the heterogeneous network elements. In this way, frequent network registration can be avoided when the terminal moves in the dual network.

Embodiment two

This embodiment describes the process of the terminal first attaching to the 2G/3G system and then moving to the SAE/LTE system, and the process of first attaching to the SAE/LTE system and then moving to the 2G/3G system. , to realize the parallel registration of the terminal on the dual network.

The flow of the dual-mode terminal in this embodiment first attaching to the 2G/3G system and then moving to the SAE/LTE system is similar to that shown in FIG. 5 , except that the indication information carried in the location update message is an update type identifier. The specific process is similar to that shown in Figure 5, and the different steps are:

In steps 5a-5h, the new SGSN sends a registration message to the HSS, carries the update type identifier in the registration message, and sets the update type as attachment; after receiving the message, the HSS triggers the old SGSN according to the indication that the update type is attachment and old MME delete the information of the terminal, delete the addresses of old SGSN and old MME on the HSS at the same time, record the address of new SGSN, that is, replace the addresses of old SGSN and old MME with the address of new SGSN; then HSS returns a registration response message.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of new SGSN.

In step 12, the MME sends a registration message to the HSS, carries the update type identifier in the registration message, and sets the update type as location update; after the HSS receives the registration message, it triggers the old MME to delete the terminal's location according to the update type. At the same time, the HSS replaces the old MME address with the new MME address, and returns a registration response message.

If the HSS does not have any MME information before (for example, the terminal moves to the SAE network for the first time), the HSS only needs to record the address of the new MME that initiated the registration request.

The flow of the dual-mode terminal in this embodiment first attaching to the SAE/LTE system and then moving to the 2G/3G system is similar to that shown in FIG. 6 , except that the indication information carried in the location update message is an update type identifier. The specific process is similar to that shown in Figure 6, and the different steps are:

Step 5a-5h, the new MME sends a registration message to the HSS, carries the update type identifier in the registration message, and sets the update type identifier as attachment; after receiving the registration message, the HSS triggers the old SGSN and old SGSN according to the update type as attachment. The MME deletes the information of the terminal, and replaces the addresses of the old SGSN and the old MME with the address of the new MME on the HSS; then the HSS returns a registration response message.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of the new MME.

In step 12, the new SGSN initiates a registration message to the HSS, carries the update type identifier in the registration message, and sets the update type identifier as location update; after the HSS receives the registration message, it triggers the deletion of the old SGSN according to the update type as location update Terminal information, and the HSS replaces the old SGSN address with the new SGSN address.

It can be seen from the process of Embodiment 2 that if the terminal initiates the attach process, the HSS will notify the old network element in the same network as the network element sending the registration message and the old network element in the heterogeneous network according to the update type indication of the value. The network element deletes the information related to the terminal, and replaces the information of the old network element in the same network and the information of the old network element in the heterogeneous network with the information of the new network element in the HSS. In this way, the terminal-related information saved on the old network element can be deleted in time, and unnecessary information on the HSS can also be deleted in time.

If the terminal initiates a location update process, the HSS will notify the old network element in the same network as the network element sending the registration message to delete the information related to the terminal according to the update type indication whose value is updated, and keep the information related to the terminal in the heterogeneous network element. information, and replace the information of the old network elements in the network with the information of the new network elements in the HSS, and retain the information of the heterogeneous network elements. In this way, frequent network registration can be avoided when the terminal moves in the dual network.

Embodiment three

This embodiment describes the process of the terminal first attaching to the 2G/3G system and then moving to the SAE/LTE system, and the process of first attaching to the SAE/LTE system and then moving to the 2G/3G system, the HSS registers the network element address as needed , to realize the parallel registration of the terminal on the dual network.

The flow of the dual-mode terminal in this embodiment first attaching to the 2G/3G system and then moving to the SAE/LTE system is similar to the flow shown in Figure 5, the difference is that the indication information carried in the location update message is the network element that needs to be registered address. The specific process is similar to the process shown in Figure 5, and the different steps are:

In steps 5a-5h, the new SGSN sends a registration message to the HSS, carries the address of the network element to be registered in the registration message, and sets this address as the address of the new SGSN; after the HSS receives the registration message, it triggers the deletion of the old SGSN and old MME For the terminal information, delete the old SGSN and old MME addresses on the HSS at the same time, record the new SGSN address, that is, replace the old SGSN and old MME addresses with the new SGSN address; then the HSS returns a registration response message.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of new SGSN.

In step 12, the new MME sends a registration message to the HSS, carries the address of the network element to be registered in the registration message, and sets the address as the address of the new MME and the address of the new SGSN; after receiving the registration message, the HSS triggers the deletion of the old MME For the terminal information, the terminal information on the new SGSN is retained, and at the same time, the HSS replaces the old MME address with the new MME address, and retains the new SGSN address in the HSS.

The flow of the dual-mode terminal in this embodiment first attaching to the SAE/LTE system and then moving to the 2G/3G system is similar to the flow shown in Figure 6, the difference is that the indication information carried in the location update message is the network element that needs to be registered address. The specific process is similar to the process in Figure 6, and the different steps are:

Step 5a-5h, the new MME sends a registration message to the HSS, carries the address of the network element to be registered in the registration message, and sets the address as the address of the new MME; after receiving the registration message, the HSS triggers the old SGSN and old MME to delete the For terminal information, delete the addresses of old SGSN and old MME on the HSS at the same time, record the address of new MME, that is, replace the addresses of old SGSN and old MME with the address of new MME; then HSS returns a registration response message.

If the terminal in the dual-network registration state is located in the 2G/3G single network, if it is abnormally shut down without the detach process, the old SGSN of the terminal in the 2G/3G system and the oldMME of the terminal in the SAE/LTE system will save the terminal information, and the addresses of the old SGSN and old MME will also be stored in the HSS. If it is normally shut down after the detach process, the old SGSN of the terminal in the 2G/3G system and the old MME of the terminal in the SAE/LTE system will delete the information of the terminal, and the old SGSN and old MME will also be deleted in the HSS Address, at this time, HSS only records the address of the new MME.

In step 12, the new SGSN initiates a registration message to the HSS, carries the address of the network element to be registered in the registration message, and sets the address as the address of the new SGSN and the address of the new MME; after receiving the registration message, the HSS triggers the deletion of the old SGSN For the terminal information, the terminal information on the new MME is retained, and at the same time, the HSS replaces the old SGSN address with the new SGSN address, and the new MME address on the HSS is retained.

It can be seen from the process of Embodiment 3 that if the terminal initiates the attach process, the HSS notifies the old network element in the same network and the old network in the heterogeneous network according to the address of the network element sending the registration message carried in the registration message (the addresses of the above-mentioned network elements are all outside the address range carried in the registration message) delete the information related to the terminal, and replace the information of the old network element and the heterogeneous network element in the same network with the information of the network element that sent the registration message in the HSS Information about old network elements in the network. In this way, the terminal-related information saved on the old network element can be deleted in time, and unnecessary information on the HSS can also be deleted in time.

If the terminal initiates a location update process, the HSS will notify the old network element in the same network as the network element that sent the registration message based on the address of the new network element that sent the registration message carried in the registration message and the address of the heterogeneous network element that the terminal registered last time. The network element (the address of the network element is outside the address range carried in the registration message) deletes the information related to the terminal, retains the information related to the terminal in the heterogeneous network element specified by the address, and uses the new network element's address in the HSS The information replaces the information of the old network element in the local network, and retains the information of the heterogeneous network element specified by the address. In this way, frequent network registration can be avoided when the terminal moves in the dual network.

Embodiment four

This embodiment describes that in the detach (detach) process initiated by the dual-mode terminal, the HSS implements parallel de-registration of the terminal on the dual network according to whether it is turned off (switch off).

Referring to FIG. 7 , it is a schematic diagram of a process of de-registration initiated by a dual-mode terminal through a 2G/3G network in Embodiment 4 of the present invention. The specific steps include:

1. The terminal shuts down, and sends a detach request message (Detach Request) to the SGSN, and the message carries a "switch off" shutdown instruction (the value is yes). Because it is a shutdown, the SGSN does not need to respond.

2. The SGSN sends a message to clear the terminal (Purge MS) to the HSS, carrying a "switch off" indication (the value is yes);

3a-3b. The HSS identifies the terminal as being cleared on both networks, and sends a Cancel Location message to the MME, notifying the MME to delete information related to the terminal.

4. The HSS responds to the SGSN.

The process of de-registration initiated by the terminal through the SAE/LTE network is similar to the above-mentioned process. The "switch off" shutdown instruction is carried in the de-registration message (similar to Purge MS) sent by the MME to the HSS, and the specific process will not be described in detail.

In this embodiment, when the terminal in the dual-network registration mode is powered off in a single network, the terminal initiates a detach process to the SGSN or MME, and the de-registration message sent by the SGSN or MME to the HSS carries the shutdown indication "switch off" value setting is "yes"; according to the instruction, the HSS notifies the other network to delete the information related to the terminal, and marks the terminal as being cleared on both networks.

When a terminal in dual-network registration mode shuts down in a dual-network overlapping coverage area, the terminal can only initiate a detach process to one of the SGSN or MME, and the de-registration message sent by the SGSN or MME to the HSS carries the terminal shutdown instruction "switch off ", the value is set to "yes"; according to the instruction, the HSS notifies the other network to delete the information related to the terminal, and marks the terminal as being cleared on both networks.

When a terminal in the dual-network registration mode initiates a detachment process due to a reason other than shutdown, the SGSN or MME learns that the terminal is detached due to a reason other than shutdown according to the detachment request sent by the terminal, and the deregistration message sent to the HSS carries a shutdown instruction "switch off" and set the value to "no"; HSS retains information related to the terminal in another network according to the instruction, and marks the terminal as cleared in the current network.

Embodiment five

This embodiment describes that in the detachment process initiated by the dual-mode terminal, the HSS implements parallel de-registration of the terminal on the dual network according to whether to de-register the heterogeneous network entity indication (Digister Inhomogenous Network Entity).

When a terminal in the dual-network registration mode shuts down in a single network, the terminal initiates a detach process to the SGSN or MME, and the de-registration message sent by the SGSN or MME to the HSS carries the Digister Inhomogenous Network Entity value of de-registering heterogeneous network entity indication Set it to "yes"; according to the instruction, the HSS notifies the other network to delete the information related to the terminal, and marks the terminal as cleared on both networks.

When a terminal in dual-network registration mode shuts down in a dual-network overlapping coverage area, the terminal can only initiate a detach process to one of the SGSN or MME, and the de-registering heterogeneous network entity instruction sent by the SGSN or MME to the HSS Digister Inhomogenous Network Entity The value is set to "yes"; according to the instruction, the HSS notifies the other network to delete the information related to the terminal, and marks the terminal as cleared on both networks.

When a terminal in the dual-network registration mode initiates a detachment process due to a reason other than shutdown, the SGSN or MME learns that the terminal is detached due to a reason other than shutdown according to the detachment request sent by the terminal, and carries the deregistration message in the deregistration message sent to the HSS Heterogeneous network entity indication, and set the value to "no"; HSS retains information related to the terminal in another network according to the indication, and identifies the terminal as being cleared in the current network.

It can be seen from the fourth and fifth embodiments above that the de-registration message sent by the SGSN/MME to the HSS carries an indication that when a terminal in dual-network registration mode shuts down in a single network, the HSS can promptly notify the other network to delete the Information related to the terminal, and the HSS identifies the terminal as cleared in both networks; when a terminal in dual-network registration mode shuts down in a dual-network overlapping coverage area, the terminal only needs to initiate a detach process to one network, through which The HSS is instructed to de-register the terminal with another network, thereby saving signaling overhead.

Embodiment six

The embodiment of the present invention also provides a registration initiating device and a de-registration initiating device.

Referring to FIG. 8 , it is a schematic structural diagram of a registration initiating device according to Embodiment 6 of the present invention. In the 2G/3G system, the device is integrated in the SGSN, and in the SAE/LTE system, the device is integrated in the MME. The device includes: a receiving unit, an indication information setting unit and a sending unit.

The receiving unit is configured to receive a request message from a multi-mode terminal, including an attach request or a location update request from the multi-mode terminal;

The indication information setting unit is used to set the indication information according to the type of the request message received by the receiving unit, specifically: according to the attachment request received by the receiving unit, the setting indication information is to notify the heterogeneous network element to delete information related to the multi-mode terminal ; According to the location update request received by the receiving unit, set the indication information to keep the heterogeneous network element information related to the multi-mode terminal;

The sending unit is configured to carry the indication information set by the indication information setting unit in the registration message sent to the HSS, and send the registration message.

Referring to FIG. 8 , it is a schematic structural diagram of a device for initiating deregistration according to Embodiment 6 of the present invention. In the 2G/3G system, the device is integrated in the SGSN, and in the SAE/LTE system, the device is integrated in the MME. The device includes: a receiving unit, an indication information setting unit and a sending unit.

The receiving unit is used to receive the detachment request message sent by the multimode terminal, including receiving the detachment request message sent by the multimode terminal due to shutdown or non-shutdown reasons;

The indication information setting unit is used to determine the reason for the detachment of the multi-mode terminal according to the detachment request message received by the receiving unit, and set the indication information according to the reason, specifically: according to the detachment received by the receiving unit due to shutdown Request, set the instruction information to notify the heterogeneous network element to delete the information related to the multi-mode terminal; according to the detachment request received by the receiving unit due to non-shutdown reasons, set the instruction information to keep the information related to the multi-mode terminal heterogeneous network element information;

The sending unit is configured to carry the indication information set by the indication information setting unit in the de-registration message sent to the HSS, and send the de-registration message.

Embodiment seven

The embodiment of the present invention also provides an HSS registration device and a de-registration device.

Referring to FIG. 9 , it is a schematic structural diagram of an HSS registration processing device according to Embodiment 7 of the present invention. The device includes: a receiving unit, an acquiring unit, a first processing unit and a second processing unit.

The receiving unit is configured to receive a registration message, the registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiated the registration process, or instruct the HSS to retain the heterogeneous information related to the multi-mode terminal. Network element information;

The acquiring unit is configured to acquire indication information from the receiving unit;

The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit to notify the heterogeneous network element to delete the information related to the multi-mode terminal:

Notify the network element in the same network as the network element that sent the registration message and the network element in the heterogeneous network that the multimode terminal registered last time, delete the information related to the multimode terminal; delete the information in the same network in the HSS Information about the network element and the network element in the heterogeneous network; and save the information of the network element sending the registration message;

The second processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for retaining heterogeneous network element information related to the multi-mode terminal:

Notify the network element that the multimode terminal registered last time and in the same network as the network element that sent the registration message, delete the information related to the multimode terminal; delete the information of the network element in the same network in the HSS, and save the sending registration Information about the network element of the message.

Referring to FIG. 9 , it is a schematic structural diagram of an HSS de-registration processing device according to Embodiment 7 of the present invention. The device includes: a receiving unit, an acquiring unit, a first processing unit and a second processing unit.

The receiving unit is used to receive a de-registration message, the de-registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiated the de-registration process, or instruct the HSS to retain information related to the multi-mode terminal Heterogeneous network element information;

The obtaining unit is used to obtain indication information from the receiving unit;

The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit to notify the heterogeneous network element to delete the information related to the multi-mode terminal:

Notify the network element in the heterogeneous network that the multimode terminal registered last time to delete the information related to the multimode terminal; delete the information of the heterogeneous network element in the HSS; identify the multimode terminal as being in the heterogeneous network, And the network element where the network element that sent the de-registration message is located is cleared;

The second processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for retaining heterogeneous network element information related to the multi-mode terminal:

The multimode terminal is identified as being cleared in the network where the network element sending the de-registration message is located.

To sum up, in the embodiment of the present invention, by setting the instruction information, the HSS can perform different registration processing for the registration messages received under the two different situations of attachment and location update, and can delete them in time while realizing dual-network registration. Some terminal-related information saved on old network elements can delete unnecessary information saved on HSS in time.

In the embodiment of the present invention, the HSS performs different de-registration processes for the reasons for the de-registration of the terminal, so that when the terminal in the dual-network registration mode is shut down in a single network, the HSS can promptly notify the other network to delete the information related to the terminal. And the HSS can correctly identify the terminal as cleared in both networks; when a terminal in dual-network registration mode shuts down in a dual-network overlapping coverage area, the terminal only needs to initiate a detach process to one network, which can effectively save signaling .

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (21)

1. A method for registering a multimode terminal in a heterogeneous network, comprising the following steps: After receiving the request from the multi-mode terminal, the network element of the first network sends a registration message to the home subscriber server HSS; and According to the request type of the multi-mode terminal, carry indication information in the registration message, instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to retain the information related to the multi-mode terminal Heterogeneous network element information; The HSS receives the registration message, and performs corresponding registration processing according to the indication information. 2. The method according to claim 1, wherein the network element of the first network sends a registration message to the HSS after receiving the attachment request of the multi-mode terminal, carrying the indication information, indicating The HSS notifies the heterogeneous network element to delete the information related to the multimode terminal; Or, after receiving the location update request of the multi-mode terminal, the network element of the first network sends a registration message to the HSS, carrying the indication information, instructing the HSS to reserve the location information related to the multi-mode terminal. Heterogeneous NE information. 3. The method according to claim 2, wherein the instruction information is whether to register the network element identification; According to the attachment request sent by the multi-mode terminal, the network element of the first network carries the identifier of whether to de-register the network element in the registration message sent to the HSS, and sets the identifier value to yes; Or, according to the location update request sent by the multi-mode terminal, the network element of the first network carries the identification of whether to de-register the network element in the registration message sent to the HSS, and sets the identification value to No . 4. The method according to claim 2, wherein the indication information is an update type identification; The network element of the first network carries the update type identifier in the registration message sent to the HSS according to the attach request sent by the multi-mode terminal, and sets the update type as attach; Or, the network element of the first network carries the update type identifier in the registration message sent to the HSS according to the location update request sent by the multi-mode terminal, and sets the update type as location update. 5. The method according to claim 2, wherein the HSS performs a process of corresponding registration processing according to the indication information notifying the heterogeneous network element to delete the information related to the multi-mode terminal, including step: Notifying the network elements in the first network and the network elements in the heterogeneous network that the multimode terminal registered last time, and deleting information related to the multimode terminal; deleting information about network elements in the first network and network elements in the heterogeneous network in the HSS, and storing information about network elements in the first network that send the registration message; Alternatively, the HSS performs a corresponding registration process according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal, including the steps of: Notifying the network element in the first network with which the multimode terminal registered last time, to delete the information related to the multimode terminal; Delete the information of the network element of the first network in the HSS, and save the information of the network element of the first network that sends the registration message. 6. The method according to claim 2, wherein the indication information is network element address information; The network element of the first network carries network element address information in the registration message sent to the HSS according to the attach request sent by the multi-mode terminal, and the network element address information is the an address of a network element of the first network; The HSS notifies the last registered network element of the multi-mode terminal that is outside the address information, deletes the information related to the multi-mode terminal, and saves the information of the network element specified by the address information; Or, the network element of the first network carries network element address information in the registration message sent to the HSS according to the location update request sent by the multi-mode terminal, and the network element address information is used to send the registration message The address of the network element of the first network, and the address of the network element in the heterogeneous network that the multi-mode terminal registered last time; The HSS deletes information about network elements other than the address information registered by the multimode terminal last time, and saves information about network elements specified by the address information. 7. The method according to any one of claims 1-2, wherein the first network and the heterogeneous network are respectively one of 2G/3G networks and SAE/LTE networks; The network element of the 2G/3G network is a serving GPRS support node SGSN, and the network element of the SAE/LTE network is a mobility management entity MME. 8. A method for de-registering a multimode terminal in a heterogeneous network, comprising the following steps: After receiving the detachment request from the multimode terminal, the network element of the first network sends a deregistration message to the HSS; and According to the reason for the de-attachment of the multi-mode terminal, carry indication information in the de-registration message, instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to keep the information related to the multi-mode terminal related heterogeneous network element information; The HSS receives the de-registration message, and performs corresponding de-registration processing according to the indication information. 9. The method according to claim 8, wherein the network element of the first network sends a de-registration message to the HSS according to the de-attachment request sent by the multi-mode terminal due to shutdown, carrying the indication information, instructing the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal; Or, the network element of the first network sends a deregistration message to the HSS according to the detachment request sent by the multi-mode terminal due to a reason other than shutdown, carrying the indication information, and instructing the HSS to retain the connection with the multi-mode terminal. Heterogeneous network element information related to the terminal. 10. The method according to claim 9, wherein the indication information is an indication of whether to shut down the machine; The network element of the first network sends the de-registration message to the HSS according to the detachment request sent by the multi-mode terminal due to the reason of shutdown, carrying the indication flag of whether to shut down, and setting the flag value to for yes; Or, the network element of the first network sends the de-registration message to the HSS according to the detachment request sent by the multi-mode terminal due to a non-shutdown reason, carrying the indication of whether to shut down, and sending The flag value is set to No. 11. The method according to claim 9, wherein the instruction information is whether to register the network element identification; The network element of the first network sends a de-registration message to the HSS according to the de-attachment request sent by the multi-mode terminal due to a shutdown reason, carrying the whether to de-register network element identifier, and setting the identifier value to yes ; Or, the network element of the first network sends a de-registration message to the HSS according to the detachment request sent by the multi-mode terminal due to non-shutdown reasons, carrying the network element identification of whether to de-register, and setting the identification value Set to No. 12. The method according to claim 9, wherein the HSS performs a corresponding de-registration process according to the indication information notifying the heterogeneous network element to delete the information related to the multi-mode terminal, Include steps: Notifying network elements in the heterogeneous network registered by the multi-mode terminal to delete information related to the multi-mode terminal; deleting the information of the heterogeneous network element registered by the multimode terminal in the HSS; identifying the multimode terminal as cleared in the first network and a heterogeneous network; Alternatively, the HSS performs a corresponding processing process according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal, including steps: Identifying the multimode terminal as cleared in the first network. 13. The method according to any one of claims 8-9, wherein the first network and the heterogeneous network are respectively one of 2G/3G networks and SAE/LTE networks; The network element of the 2G/3G network is a serving GPRS support node SGSN, and the network element of the SAE/LTE network is a mobility management entity MME. 14. A registration initiation device, characterized in that, comprising: a receiving unit, configured to receive a request message from a multimode terminal; An indication information setting unit, configured to set indication information according to the request type of the multi-mode terminal received by the receiving unit, instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to keep Heterogeneous network element information related to the multimode terminal; A sending unit, configured to carry the indication information set by the indication information setting unit in a registration message sent to the HSS, and send the registration message. 15. The device according to claim 14, wherein the receiving unit receives an attach request or a location update request of a multimode terminal; According to the attachment request received by the receiving unit, the indication information setting unit sets the indication information to notify the heterogeneous network element to delete the information related to the multi-mode terminal; according to the location update request received by the receiving unit , setting the indication information as retaining heterogeneous network element information related to the multi-mode terminal. 16. The device according to claim 14, wherein in the 2G/3G network, the device is integrated in the SGSN; in the SAE/LTE network, the device is integrated in the MME. 17. A de-registration initiation device, characterized in that, comprising: a receiving unit, configured to receive a detach request message sent by a multimode terminal; An indication information setting unit, configured to determine the reason for the detachment of the multi-mode terminal according to the detachment request message received by the receiving unit, and set indication information according to the reason, and instruct the HSS to notify the heterogeneous network element to delete the information related to the multi-mode terminal, or instruct the HSS to retain heterogeneous network element information related to the multi-mode terminal; A sending unit, configured to carry the indication information set by the indication information setting unit in a de-registration message sent to the HSS, and send the de-registration message. 18. The device according to claim 17, wherein the receiving unit receives the detachment request message sent by the multimode terminal due to shutdown or non-shutdown reasons; The instruction information setting unit sets the instruction information to notify the heterogeneous network element to delete the information related to the multi-mode terminal according to the detachment request received by the receiving unit due to shutdown; according to the receiving unit In the received detachment request sent due to a reason other than shutdown, set the indication information as retaining heterogeneous network element information related to the multi-mode terminal. 19. The device according to claim 17, wherein in the 2G/3G network, the device is integrated in the SGSN; in the SAE/LTE network, the device is integrated in the MME. 20. A registration processing device for HSS, characterized in that, comprising: The receiving unit is configured to receive a registration message, the registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiates the registration process, or instructs the HSS to retain information related to the multi-mode terminal Terminal-related heterogeneous network element information; an obtaining unit, configured to obtain the indication information from the receiving unit; The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for notifying heterogeneous network elements to delete information related to the multi-mode terminal: Notify the network element in the same network as the network element that sent the registration message and the network element in the heterogeneous network that the multimode terminal registered last time, delete the information related to the multimode terminal; delete the Information about the network elements in the same network and the network elements in the heterogeneous network in the HSS; and saving the information about the network element sending the registration message; The second processing unit is configured to perform the following processing according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal obtained by the obtaining unit: Notify the network element in the same network as the network element that sent the registration message that the multimode terminal registered last time, delete the information related to the multimode terminal; delete the network element in the same network in the HSS and save the information of the network element that sends the registration message. 21. A de-registration processing device of HSS, characterized in that, comprising: The receiving unit is configured to receive a de-registration message, the de-registration message carries indication information, and the indication information instructs the HSS to notify the heterogeneous network element to delete information related to the multi-mode terminal that initiated the de-registration process, or instruct the HSS to retain information related to the multi-mode terminal that initiated the de-registration process. Describe the heterogeneous network element information related to the multi-mode terminal; an obtaining unit, configured to obtain the indication information from the receiving unit; The first processing unit is configured to perform the following processing according to the indication information obtained by the obtaining unit for notifying heterogeneous network elements to delete information related to the multi-mode terminal: Notify the network element in the heterogeneous network that the multimode terminal registered last time to delete the information related to the multimode terminal; delete the information of the heterogeneous network element in the HSS; identify the multimode terminal as being in In the heterogeneous network, and in the network where the network element sending the de-registration message is located is cleared; The second processing unit is configured to perform the following processing according to the indication information for retaining heterogeneous network element information related to the multi-mode terminal obtained by the obtaining unit: Identifying the multi-mode terminal as being cleared in the network where the network element sending the de-registration message is located.

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