CN101657024B - Treatment method and treatment device of ISR mechanism - Google Patents

Abstract

The invention discloses a treatment method of an ISR mechanism, can ensure the continuity of a CS service under conditions of activation and inactivation of the ISR mechanism and relates to the field of the return treatment of a CS service to a traditional network. The treatment method of the ISR mechanism comprises that: an SGSN acquires SGs interface information; and SGSN determines whether to activate the ISR mechanism between the SGSN and an MME or not according to the SGs interface information to ensure the SGs association or Gs association established by a user terminal. The invention also discloses an SGSN device, which comprises an SGs interface information acquisition unit used for the SGSN to acquire the SGs interface information and an ISR mechanism selection unit used for the SGSN to determine whether to activate the ISR mechanism between the MME and the SGSN according to the SGs. The method is suitable to be used in the field of return treatment of the CS service to the traditional network.

Description

A processing method and device for an ISR mechanism

technical field

The invention relates to the field of mobile communication, in particular to the field of processing CS services back to traditional networks.

Background technique

GPRS/UMTS (General Packet Radio Service General Packet Radio Service, Universal Mobile Telecommunications System Universal Mobile Communication System) is a mobile communication network defined by 3GPP organization, including radio access network (Radio Access Network, RAN) and core network (Core Network , CN) in two parts. CN is logically divided into a circuit switched domain (Circuit Switched Domain, CS) that mainly processes voice services and a packet switched domain (Packet Switched Domain, PS) that mainly processes packet services. As shown in Figure 1, the signaling plane control entity of the CS domain is MSC/VLR (Mobility Management Entity, Visitor Location Register), and the signaling plane control entity of the PS domain is SGSN (Serving GPRS Support Node, serving GPRS support node), SGSN and MSC/VLR can be connected through the Gs interface. The SGSN is connected to the BSC through the A interface, and connected to the RNC through the Iu interface, and serves GPRS/UMTS data services.

3GPP formulated the long-term evolution plan (LTE, Long Term Evolution) at the end of 2004, under the guidance of the evolution plan, it defined the architecture of the new mobile communication network, as shown in Figure 2, the architecture is flatter than the current GPRS/UMTS , and only the packet field is reserved, so it can be called an evolved packet network (EPS, evolved packet system). Since many services of the operator run in the circuit domain of GPRS/UMTS, in order to reuse the existing CS services in the EPS network, a method of connecting to the CS domain of the GPRS/UMTS core network through the EPS network is proposed. As shown in Figure 3, the MME (MobilityManagement Entity) in the EPS network is connected to the MSC in the CS domain of the GPRS/UMTS core network through an SGs interface. Under this architecture, when the UE is about to initiate the CS MO (Mobile Originating) service, the UE needs to transfer to the GPRS/UMTS network first, select a 2G/3G cell to camp on, and then start the MO service. When the MSC receives a MT (Mobile Terminated) service, the MSC sends a paging message to the MME through the SGs interface, and the MME pages the UE through the EPS network. After receiving the paging message, the UE needs to go to the GPRS/UMTS network, select a 2G/3G cell to camp, and then complete the subsequent processing of the MT service. Therefore, this architecture and processing method can be called "CS fallback" (CS business returns to traditional network processing).

One requirement of the evolved network is to implement ISR (Idle mode signaling reduction, saving signaling or restricting signaling in idle mode), which is mainly to reduce the mobility management process of UE in idle mode between different access networks ( Such as reducing Inter3GPP Access System Mobility in Idle State processing between GERAN/UTRAN and EUTRAN). At present, the solution of the ISR mechanism between 3GPP access networks is the dual registration mechanism, that is, the UE registers in two different access networks, so that the UE in idle mode will not trigger when it moves between the two access networks. Inter 3GPP Access SystemMobility process, such as inter-system RAU/LAU process.

In an LTE network, when the UE initiates a joint registration or joint update process, if the MME supports the SGs interface, the MME will save the SGs association to the MSC for the UE during the process, and the state recorded by the MME is SGs-ASSOCIATED, and the MSC The status of the /VLR record is also SGs-ASSOCIATED. At the same time, the MME and the MSC/VLR also need to store addresses with each other. In the GPRS/UMTS access network GERAN/UTRAN network, when the UE initiates a joint registration or joint update process, if the SGSN supports the Gs interface, the SGSN will save the Gs association to the MSC for the UE in the process. At this time, the state of the SGSN record is Gs-ASSOCIATED, and the state of the MSC/VLR record is also Gs-ASSOCIATED. At the same time, the SGSN and the MSC/VLR also need to store addresses with each other. The access network elements of the GERAN/UTRAN network have two sets of different interfaces, that is, they can access the circuit domain and the packet domain.

In the existing 3GPP protocol (TS 23.272, TS 29.018), it is described that when the UE performs a single LAU process (user location area change or periodic location update in the circuit domain) instead of a joint update (joint circuit domain and packet domain location update), then the SGs association or Gs association previously held by the MSC for the UE will be released by the MSC. CS Fallback only involves UEs residing in the LTE network, provided that the state recorded by the MME is SGs-ASSOCIATED. When the service in the circuit domain reaches the MSC, the MSC sends the message to the MME through the SGs interface, and the MME pages the user in the packet domain. Since the access network elements of the LTE network cannot access the circuit domain, the user receives a paging from the LTE network and knows that it is a circuit domain service, so he can only switch to the GERAN/UTRAN network and connect to the network through their access network elements. Enter the circuit domain, and respond to complete the business of the circuit domain.

In the process of realizing the above-mentioned ISR processing method in which the CS service is returned to the traditional network processing scenario, the inventor finds that at least the following problems exist in the prior art:

Since the MSC can only maintain one of the SGs interface or the Gs interface at the same time: when the UE moves between the GERAN/UTRAN network and the LTE network, it performs a separate RAU (location update in the packet domain) or LAU (location update in the circuit domain) process. The SGs or Gs association previously held by the MSC for the UE will be released. The MME cannot perceive that the state of the MSC record changes to SGs-NULL (the SGs association of the UE is released), and cannot perceive whether the SGSN supports the establishment of a Gs association for the UE. And after the ISR mechanism is started, the characteristics of the ISR will not trigger the joint location update (through this process to re-create the SGs association for the UE). As a result, in the scenario where the CS service is returned to the traditional network for processing, after the ISR is activated, the CS domain service is interrupted, that is, the UE cannot receive the paging message. The network side also cannot receive the paging response from the UE.

Contents of the invention

Embodiments of the present invention provide a method and device for processing an ISR mechanism, which can ensure the continuity of CS services in scenarios where the ISR mechanism is activated or not activated.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A method for processing a signaling saving mechanism in an idle mode, the method comprising:

The serving GPRS support node SGSN obtains the SGs interface information;

The SGSN selects whether to activate the signaling saving mechanism in idle mode between the SGSN and the mobility management entity MME according to the SGs interface information, so as to maintain the SGs association or Gs association established for the user terminal;

Wherein, the SGSN selects according to the SGs interface information whether to activate the saving signaling mechanism in the idle mode between the SGSN and the MME, so as to maintain the SGs association or the Gs association for the user terminal includes:

If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN can establish a Gs association for the user terminal, the SGSN will process it according to the normal signaling saving mechanism in the active idle mode;

If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN cannot establish a Gs association for the user terminal, the SGSN will not activate the signaling saving mechanism in idle mode;

If the SGs interface information indicates that the MME has established SGs association for the UE, the SGSN does not activate the signaling saving mechanism in idle mode.

The present invention also provides a method for processing a signaling saving mechanism in idle mode, the method comprising:

The mobile management entity MME obtains the Gs interface information;

The MME selects according to the Gs interface information whether to activate the saving signaling mechanism in the idle mode between the MME and the serving GPRS support node SGSN, so as to maintain the SGs association or Gs association established for the user terminal;

Wherein, the MME selects according to the Gs interface information whether to activate the saving signaling mechanism in the idle mode between the MME and the SGSN, so as to maintain the SGs association or Gs association established for the user terminal includes:

If the Gs interface information is that the SGSN can establish the Gs association for the user terminal and the MME executes the establishment of the SGs association for the user terminal in the evolved packet network, the MME will handle it according to the normal signaling saving mechanism in the active idle mode;

If the Gs interface information is that the SGSN cannot establish a Gs association for the user terminal and the MME executes establishing an SGs association for the user terminal in the evolved packet network, the MME does not activate the saving signaling mechanism in idle mode.

The present invention also provides a SGSN device, and the SGSN device includes:

SGs interface information acquiring unit, used for serving GPRS support node SGSN to acquire SGs interface information;

The saving signaling mechanism selection unit in idle mode is used for the SGSN to select whether to activate the saving signaling mechanism in the idle mode between the SGSN and the mobility management entity MME according to the SGs interface information, so as to maintain the SGs association established for the user terminal or Gs association;

Wherein, the SGSN selects according to the SGs interface information whether to activate the saving signaling mechanism in the idle mode between the SGSN and the MME, so as to maintain the SGs association or Gs association established for the user terminal includes:

If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN can establish a Gs association for the user terminal, the SGSN will process it according to the normal signaling saving mechanism in the active idle mode;

If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN cannot establish a Gs association for the user terminal, the SGSN will not activate the signaling saving mechanism in idle mode;

If the SGs interface information indicates that the MME has established SGs association for the UE, the SGSN does not activate the signaling saving mechanism in idle mode.

The present invention also provides an MME device, the MME device comprising:

The Gs interface information obtaining unit is used for the mobile management entity MME to obtain the Gs interface information;

The saving signaling mechanism selection unit in idle mode is used for MME to select whether to activate the saving signaling mechanism in idle mode between the serving GPRS support node SGSN and MME according to the Gs interface information, so as to maintain the SGs established for the user terminal Association or Gs Association;

Wherein, the MME selects according to the Gs interface information whether to activate the saving signaling mechanism in the idle mode between the SGSN and the MME, so as to maintain the SGs association or Gs association established for the user terminal includes:

If the Gs interface information is that the SGSN can establish the Gs association for the user terminal and the MME executes the establishment of the SGs association for the user terminal in the evolved packet network, the MME will handle it according to the normal signaling saving mechanism in the active idle mode;

If the Gs interface information is that the SGSN cannot establish a Gs association for the user terminal and the MME executes establishing an SGs association for the user terminal in the evolved packet network, the MME does not activate the saving signaling mechanism in idle mode.

The processing method of the ISR mechanism provided by the embodiment of the present invention can select whether to activate the ISR mechanism according to the Gs interface information or the SGs interface information in the scenario where the CS service is returned to the traditional network for processing. The SGs or Gs association established for the UE can be maintained in the case of activating the ISR mechanism or not activating the ISR mechanism, so as to ensure the continuity of the CS service in the scenario where the CS service returns to the traditional network for processing by the UE.

Description of drawings

FIG. 1 is a prior art GPRS/UMTS network architecture diagram;

FIG. 2 is a prior art wireless evolution network architecture diagram (non-roaming scenario);

FIG. 3 is a schematic diagram of an EPS network architecture in the prior art;

FIG. 4 is a flow chart of processing method 1 of the ISR mechanism according to an embodiment of the present invention;

FIG. 5 is a flow chart of an embodiment of processing method 1 of the ISR mechanism of the embodiment of the present invention;

6 is a flow chart of the second processing method of the ISR mechanism of the embodiment of the present invention;

7 is a flow chart of an embodiment of the second processing method of the ISR mechanism of the embodiment of the present invention;

FIG. 8 is a schematic diagram of a processing device 1 of an ISR mechanism according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a processing device 2 of an ISR mechanism according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a method and device for processing an ISR mechanism, which can ensure the continuity of CS services in scenarios where the ISR mechanism is activated or not activated.

A method and device for processing an ISR mechanism according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 4, the embodiment of the present invention provides a kind of processing method of ISR mechanism, and described method comprises:

S11. The SGSN obtains the SGs interface information;

S12. The SGSN selects whether to activate the ISR mechanism between the SGSN and the MME according to the SGs interface information, so as to maintain the SGs association or Gs association established for the user terminal.

Embodiment one

As shown in FIG. 5, the embodiment of the present invention is a processing method of ISR under the scenario where the CS service is returned to the traditional network processing when the UE is registered with the MME, including steps:

S10. The UE moves to the SGSN1 and initiates a route update; wherein, the route update request message carries a GUTI (Globally Unique Temporary Identity) allocated by the MME. After the UE successfully attaches to the MME, if the UE indicates the CSfallback indicator in the Attach Request (attach request message), the MME also needs to register the UE with the MSC. At this time, the MME establishes an SGs association for the UE, and the MME and MSC record status is SGs-ASSOCIATED .

S11. The SGSN obtains the SGs interface information;

S12. The SGSN selects whether to activate the ISR mechanism between the SGSN and the MME according to the SGs interface information, so as to maintain the SGs association or Gs association established for the user terminal;

S13, the SGSN and the Serving GW interactively confirm the update bearer; wherein, the SGSN sends an update bearer request message to the Serving GW, and the Serving GW returns an update bearer response to the SGSN after updating the bearer context.

S14, the SGSN and the HSS interact to complete the process of location registration and subscription data acquisition;

S15, the SGSN interacts with the UE to complete the routing update;

The SGSN sends a routing update acceptance message to the UE, and the message includes the newly allocated temporary identity P-TMSI and information indicating ISR activation. Afterwards, the UE sends a routing update complete message to the SGSN;

S16, UE performs periodic location update in SGSN and MME;

After the ISR is activated, the UE uses the GUTI and P-TMSI (IPacket Temporary Mobile Subscriber Identity) assigned by the two systems to identify itself, and carries the above identification in the uplink request message. The UE not only performs normal SGSN internal routing update and periodic routing update under the SGSN, but also performs normal MME internal tracking area update and periodic tracking area update under the MME. Both the SGSN and the MME start the corresponding user reachable timer to monitor the periodic location update of the UE. If the MME records the status as SGs-ASSOCIATED, the periodic tracking area update will not be accompanied by the location area update (Location Area Update). If the SGSN record status is Gs-ASSOCIATED, the periodic routing area update will not be accompanied by the location area update (Location Area Update). If the update is performed aperiodically, a joint update needs to be performed to ensure the SGs association or Gs association of the UE.

S17. The MME performs bearer update;

When the UE is in the GERAN/UTRAN system, the bearer is established, modified or deleted, and the bearer context on the UE, SGSN, Serving GW, and PDN GW is updated accordingly, but the bearer saved on the MME is still unchanged. context. At this time, the UE will modify the status of the GUTI to be not updated, and record that a bearer update needs to be initiated. The specific steps for the MME to update the bearer are as follows:

S17A, the UE moves to the MME, sends a tracking area update request message to the MME, the message carries the S-TMSI and the P-TMSI, and indicates that the bearer needs to be updated;

S17B, the MME interacts with the SGSN to complete the bearer update;

S17C, the MME initiates a bearer update to the Serving GW, and updates information in the bearer context on the Serving GW;

S17D. The MME sends a routing update acceptance message to the UE, indicating information about ISR activation.

In this embodiment, step S10: the SGSN obtains the SGs interface information specifically as follows:

S10A, the SGSN obtains the SGs interface information through the message provided by the user terminal;

or,

S10B, the SGSN obtains the SGs interface information through the context message provided by the MME.

The specific implementation of step S10A may be that the UE carries the information element "CS fallback indicator" in the routing update request message to indicate the SGSN: whether the UE has SGs association. If it is not carried, or the information element takes an invalid value, it indicates that the UE does not have SGs association.

The specific implementation of step S10B may be that the SGSN carries information elements in the context request message (context request) to ask the MME whether to establish SGs association for the UE, that is, whether the SGs interface information held in the MME is SGs-ASSOCIATED. The MME records the SGs information as SGs-ASSOCIATED (the SGs association has been established for the UE), then in the Context Response message, according to the query or actively provide the information that the SGs association has been established for the UE, the form of expression is that a Context Response message is carried The information element (such as: CSfallback indicator) indicates that the SGs association has been established for the UE at this time or indicates that the UE has successfully executed the joint EPS/IMSI attach process, that is, the SGs association has been established for the UE, which can be reflected in the information element itself or It is a value embodiment of a cell.

In step S11 of this embodiment, the SGSN selects whether to activate the ISR mechanism between the SGSN and the MME according to the SGs interface information, thereby maintaining the SGs association or Gs association established for the user terminal includes the following situations:

(1) If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN can establish a Gs association for the user terminal, the SGSN will handle it according to the normal activation ISR mechanism;

(2) If the SGs interface information is that the MME has established an SGs association for the user terminal and the SGSN cannot establish a Gs association for the user terminal, the SGSN does not activate the ISR mechanism;

(3) If the SGs interface information is that the MME has established SGs association for the user terminal, the SGSN does not activate the ISR mechanism;

or,

(4) If the SGs interface information is that the MME has not established an SGs association for the user terminal, the SGSN chooses to activate the ISR mechanism according to the normal ISR activation processing mechanism;

(5) If the SGs interface information is that the MME has established SGs association for the user terminal, and the SGSN has not established the Gs association for the user terminal after activating the ISR mechanism, the SGSN sends the user terminal location information or MSC address to the MME. After that, the MME sends a message to the MSC to re-establish the SGs association for the user terminal according to the location information of the user terminal or the MSC address provided by the SGSN; at the same time, the SGSN instructs the user terminal to perform a circuit domain update in the 2G/3G network and trigger the packet domain execution of updates;

(6) If the SGs interface information is that the MME has established SGs association for the user terminal, the SGSN activates the ISR mechanism and establishes a Gs connection for the user terminal.

In the above two cases (5) and (6), every time the UE executes RAU, if it finds that the ISR has been started, it needs to send a message to notify the MME that establishes the ISR association of the UE's Gs interface association information. This association information includes: a1, whether the SGSN has established a Gs interface association for the UE; b1, if the SGSN has not established a Gs interface association for the UE, the SGSN needs to provide the UE's location information (such as: LAI or RAI) to the MME, so that the MME can find it The MSC where the UE is currently camping restores the SGs interface. At this time, the SGSN may also provide the MSC address to the MME. After receiving the Gs association information provided by the SGSN, the MME performs the following processing: a2. If the SGSN establishes a Gs association for the UE, the MME does not perform any processing; b2. If the SGSN does not establish a Gs interface association for the UE, the MME considers the ISR while maintaining the ISR When the UE may have executed the LAU process, and the UE's SGs association may have been released by the MSC, it is necessary to actively send a message to the MSC to re-establish the SGs association for the UE.

In addition, when the SGSN does not activate the ISR mechanism, the message sent to the MME does not carry the instruction to activate the ISR mechanism; when the SGSN activates the ISR mechanism, the message sent to the MME carries the instruction to activate the ISR mechanism.

The embodiment of the present invention provides the ISR processing method in the scenario where the CS service is returned to the traditional network for processing. In the scenario where the CS service is returned to the traditional network for processing, the SGSN can choose whether to activate the ISR mechanism according to the SGs interface information provided by the MME or the user terminal. The SGs or Gs association established for the UE can be maintained in the case of activating the ISR mechanism or not activating the ISR mechanism, so as to ensure the continuity of the CS service in the scenario where the CS service returns to the traditional network for processing by the UE.

As shown in Figure 6, the embodiment of the present invention also provides a processing method of the ISR mechanism, the method comprising:

S21. The MME obtains the Gs interface information

S22. The MME selects whether to activate the ISR mechanism between the MME and the SGSN according to the Gs interface information, so as to keep the SGs association or the Gs association established for the user terminal.

Embodiment two

As shown in FIG. 7 , the embodiment of the present invention is an ISR processing method in which the CS service returns to the traditional network processing scenario when the UE is registered in the SGSN, including steps:

S20. The UE moves to the MME and initiates a tracking area update;

S21. The MME obtains the Gs interface information;

S22. The MME selects whether to activate the ISR mechanism between the MME and the SGSN according to the Gs interface information, so as to maintain the SGs association or Gs association established for the user terminal;

S23. The MME and the Serving GW interactively confirm the update bearer; wherein, the SGSN sends an update bearer request message to the Serving GW, and the Serving GW returns an update bearer response to the MME after updating the bearer context.

S24, the MME and the HSS interact to complete location registration and subscription data acquisition;

S25. The MME interacts with the UE to update the tracking area;

S26, UE performs periodic location update in SGSN and MME;

After the ISR is activated, the UE uses the GUTI and P-TMSI allocated by the two systems to identify itself, and carries the above identification in the uplink request message. The UE not only performs normal SGSN internal routing update and periodic routing update under the SGSN, but also performs normal MME internal tracking area update and periodic tracking area update under the MME. Both SGSN and MME start the corresponding user reachable timer to monitor the periodic location update of the UE. If the MME records the status as SGs-ASSOCIATED, the periodic tracking area update will not be accompanied by the location area update (Location Area Update); SGSN If the record status is Gs-ASSOCIATED, the periodic routing area update will not be accompanied by location area update. If the update is performed aperiodically, a joint update needs to be performed to ensure the SGs association or Gs association of the UE.

S27. The SGSN performs bearer update.

When the UE is in the GERAN/UTRAN system, the bearer is established, modified or deleted, and the bearer context on the UE, MME, Serving GW, and PDN GW is updated accordingly, but the bearer saved on the SGSN is still unchanged. context. At this time, the UE will modify the status of the GUTI to be not updated, and record that a bearer update needs to be initiated. The specific steps for the SGSN to perform bearer update are as follows:

S27A, the UE moves to the SGSN, sends a tracking area update request message to the SGSN, the message carries the S-TMSI and the P-TMSI, and indicates that the bearer needs to be updated;

S27B, SGSN and MME interact to complete bearer update;

S27C, the MME initiates a bearer update to the Serving GW, and updates information in the bearer context on the Serving GW.

S27D. The MME sends a routing update acceptance message to the UE, indicating information about ISR activation.

In this embodiment, step S20MME obtains the Gs interface information as follows:

S20A, the MME obtains the Gs interface information through the message provided by the user terminal;

or,

S20B. The MME obtains the Gs interface information through the context message provided by the MME.

The specific implementation of step S20A may be that the UE carries the information element "CSfallback indicator" in the tracking area update request message to indicate the SGSN: whether the UE has SGs association. If it is not carried, or the information element takes an invalid value, it indicates that the UE does not have SGs association.

The specific implementation of step S20B may be that the MME carries information elements (such as: Gs CapabilityNeeded) in the message to inquire whether the SGSN can establish a Gs association for the UE (the SGSN maintains the Gs interface information of the UE). The information provided by the SGSN may be: the Gs interface information provided by the SGSN may be: the Gs association cannot be established for the UE; the GS association can be established for the UE, but the current Gs interface information held by the SGSN is Gs-NULL; the Gs interface information held by the SGSN is Gs-ASSOCIATED (Gs association has been established for UE).

In step S21 of this embodiment, the MME selects whether to activate the ISR mechanism according to the Gs interface information of the SGSN, so as to maintain the SGs association or Gs association established for the user terminal, including the following situations:

(1) If the Gs interface information is that the SGSN can establish the Gs association for the user terminal and the MME executes the establishment of the SGs association for the user terminal in the evolved packet network, the MME will handle it according to the normal activation ISR mechanism;

(2) If the Gs interface information is that the SGSN cannot establish a Gs association for the user terminal and the MME executes establishing an SGs association for the user terminal in the evolved packet network, the MME does not activate the ISR mechanism;

or,

(3) If the Gs interface information is that the SGSN cannot establish a Gs association for the user terminal and the MME establishes an SGs association for the user terminal in the evolved packet network, the MME activates the ISR mechanism and instructs the user terminal to perform circuit domain update in the 2G/3G network. Execution of packet field updates;

(4) If the MME establishes SGs association for the user terminal in the evolved packet network, the MME does not activate the ISR mechanism;

or,

(5) If the MME does not establish SGs association for the user terminal in the evolved packet network, the MME handles it according to the normal activation ISR mechanism.

In addition, when the MME does not activate the ISR mechanism, the message sent to the SGSN does not carry the indication of activating the ISR mechanism; when the MME activates the ISR mechanism, the message sent to the SGSN does not carry the indication of activating the ISR mechanism.

The embodiment of the present invention provides an ISR processing method in the scenario where the CS service is returned to the traditional network for processing. In the case of the CS service returning to the traditional network for processing, the MME can choose whether to activate the ISR mechanism according to the Gs interface information provided by the SGSN or the user terminal. One of the SGs and Gs associations established for the UE can be maintained in the case of activating the ISR mechanism or not activating the ISR mechanism, so as to ensure the continuity of the CS service in the scenario where the CS service returns to the traditional network for processing by the UE.

As shown in Figure 8, the present invention also provides a SGSN device, the SGSN includes:

SGs interface information acquiring unit 1, used for SGSN to acquire SGs interface information;

The ISR mechanism selection unit 2 is used for the SGSN to select whether to activate the ISR mechanism between the SGSN and the MME according to the SGs interface information, so as to maintain the SGs association or Gs association established for the user terminal.

The SGs interface information acquisition unit 1 acquires the SGs interface information through the context message provided by the MME or the message provided by the user. The method for obtaining the SGs interface information and the method for the ISR mechanism selection unit 2 to select the ISR mechanism have been described in detail in the first method example. This will not be repeated here.

As shown in Figure 9, the present invention also provides an MME device, the MME includes:

Gs interface information acquiring unit 3, used for MME to acquire Gs interface information;

The ISR mechanism selection unit 4 is used for the MME to select whether to activate the ISR mechanism between the SGSN and the MME according to the Gs interface information, so as to maintain the SGs association or Gs association established for the user terminal.

The Gs interface information obtaining unit 3 obtains the Gs interface information through the context message provided by the SGSN or the message provided by the user. The method for obtaining the SGs interface information and the method for the ISR mechanism selection unit 2 to select the ISR mechanism have been described in detail in the above method example two. This will not be repeated here.

In the processing device for the ISR mechanism provided by the embodiment of the present invention, according to the SGs or Gs interface information provided by the interface information acquisition unit, whether the ISR mechanism selection unit activates the ISR mechanism can be kept as One of the SGs and Gs associations established by the UE, so as to ensure the continuity of the CS service in the scenario where the CS service returns to the traditional network for processing by the UE.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (13)

1. A method for processing a saving signaling mechanism in an idle mode, the method comprising:

a Serving GPRS Support Node (SGSN) acquires SGs interface information;

the SGSN selects whether to activate a signaling saving mechanism in an idle mode between the SGSN and a Mobile Management Entity (MME) according to the SGs interface information so as to keep the SGs association or Gs association established for the user terminal;

wherein, the SGSN selects whether to activate a signaling saving mechanism in an idle mode between the SGSN and the MME according to the SGs interface information, so that maintaining SGs association or Gs association for the user terminal includes:

if the SGs interface information is that the MME establishes SGs association for the user terminal and the SGSN can establish Gs association for the user terminal, the SGSN carries out processing according to a normal signaling saving mechanism in the activated idle mode;

if the SGs interface information is that the MME establishes SGs association for the user terminal and the SGSN can not establish Gs association for the user terminal, the SGSN does not activate a signaling saving mechanism in an idle mode;

if the SGs interface information is that the MME establishes SGs association for the user terminal, the SGSN does not activate a signaling saving mechanism in an idle mode.

2. The method as claimed in claim 1, wherein the acquiring the SGs interface information by the SGSN includes:

the SGSN acquires SGs interface information through the context information provided by the MME; or,

the SGSN acquires the SGs interface information through the information provided by the user terminal.

3. The method according to claim 2, wherein the SGSN selects whether to activate the idle-mode power-saving signaling mechanism between the SGSN and the MME according to the SGs interface information, so as to maintain SGs association or Gs association for the ue, further comprising:

if the SGs interface information is that the MME does not establish SGs association for the user terminal, the SGSN processes according to a normal signaling saving mechanism under the activated idle mode.

4. The method according to claim 2, wherein the SGSN selects whether to activate the idle-mode power-saving signaling mechanism between the SGSN and the MME according to the SGs interface information, so as to maintain SGs association or Gs association for the ue, further comprising:

if the SGs interface information is that the MME establishes SGs association for the user terminal, the SGSN establishes Gs association for the user terminal after activating a signaling saving mechanism in an idle mode;

if the SGs interface information is that the MME establishes SGs association for the user terminal, the SGSN does not establish Gs association for the user terminal after activating a signaling saving mechanism in an idle mode, and the SGSN sends user terminal position information or an MSC address to the MME.

5. The method according to claim 4, wherein if the SGs interface information is to establish an SGs association for the UE, the SGSN does not establish a Gs association for the UE after activating the idle-mode signaling saving mechanism, and after the SGSN sends the UE location information or the MSC address to the MME, the method comprises:

the MME sends a message to the MSC according to the position information of the user terminal or the MSC address provided by the SGSN to reestablish SGs association for the user terminal;

the SGSN instructs the user terminal to perform the circuit domain update in the 2G/3G network while triggering the execution of the packet domain update.

6. A method for processing a saving signaling mechanism in an idle mode, the method comprising:

a mobile management entity MME acquires Gs interface information;

the MME selects whether to activate a signaling saving mechanism in an idle mode between the MME and a serving GPRS supporting node SGSN according to the Gs interface information so as to keep SGs association or Gs association established for the user terminal;

wherein, the MME selects whether to activate a signaling saving mechanism in an idle mode between the MME and the SGSN according to the Gs interface information, so that the keeping of the SGs association or the Gs association established for the user terminal comprises:

if the Gs interface information is that the SGSN can establish Gs association for the user terminal and the MME executes the SGs association established for the user terminal in an evolved packet network, the MME carries out processing according to a signaling saving mechanism under a normal activated idle mode;

if the Gs interface information is that the SGSN can not establish Gs association for the user terminal and the MME executes to establish SGs association for the user terminal in an evolved packet network, the MME does not activate a signaling saving mechanism in an idle mode.

7. The method of claim 6, wherein the MME acquires Gs interface information by the method for processing the idle-mode signaling saving mechanism, comprising:

the MME acquires Gs interface information through context information provided by the SGSN; or,

and the MME acquires the Gs interface information through the message provided by the user terminal.

8. The method according to claim 6, wherein the MME selects whether to activate the idle-mode power-saving signaling mechanism between the MME and the SGSN according to the Gs interface information, so as to maintain the SGs association or the Gs association for the UE, further comprising:

if the Gs interface information is that the SGSN can not establish Gs association for the user terminal and the MME establishes SGs association for the user terminal in an evolved packet network, the MME activates a signaling saving mechanism in an idle mode and simultaneously indicates the user terminal to execute circuit domain update in the 2G/3G network and simultaneously triggers the execution of the packet domain update.

9. The method according to claim 6, wherein the MME selects whether to activate the idle-mode power-saving signaling mechanism between the MME and the SGSN according to the Gs interface information, so as to maintain the SGs association or the Gs association for the UE, further comprising:

if the MME establishes SGs association for the user terminal in an evolved packet network, the MME does not activate a signaling saving mechanism in an idle mode;

if the MME does not establish SGs association for the user terminal in the evolved packet network, the MME performs processing according to a normal signaling saving mechanism in the activated idle mode.

10. An SGSN apparatus, comprising:

an SGs interface information obtaining unit, configured to obtain SGs interface information by a serving GPRS support node SGSN;

a saving signaling mechanism selection unit in idle mode, configured to select, by the SGSN, whether to activate a saving signaling mechanism in idle mode between the SGSN and the mobility management entity MME according to the SGs interface information, so as to maintain an SGs association or a Gs association established for the user terminal;

wherein, the SGSN selects whether to activate a signaling saving mechanism in an idle mode between the SGSN and the MME according to the SGs interface information, so as to maintain the SGs association or Gs association established for the user terminal, including:

if the SGs interface information is that the MME establishes SGs association for the user terminal and the SGSN can establish Gs association for the user terminal, the SGSN carries out processing according to a normal signaling saving mechanism in the activated idle mode;

if the SGs interface information is that the MME establishes SGs association for the user terminal and the SGSN can not establish Gs association for the user terminal, the SGSN does not activate a signaling saving mechanism in an idle mode;

if the SGs interface information is that the MME establishes SGs association for the user terminal, the SGSN does not activate a signaling saving mechanism in an idle mode.

11. The SGSN apparatus of claim 10, wherein the SGs interface information obtaining unit obtains the SGs interface information through a context message provided by an MME or a message provided by a user.

12. An MME apparatus, wherein the MME apparatus comprises:

a Gs interface information acquiring unit, configured to acquire Gs interface information by a mobility management entity MME;

an idle mode saving signaling mechanism selecting unit, configured to select, by the MME, whether to activate a saving signaling mechanism in the idle mode between the serving GPRS support node SGSN and the MME according to the Gs interface information, so as to maintain an SGs association or a Gs association established for the user terminal;

wherein, the MME selects whether to activate a signaling saving mechanism in an idle mode between the SGSN and the MME according to the Gs interface information, so that keeping the SGs association or the Gs association established for the user terminal comprises:

if the Gs interface information is that the SGSN can establish Gs association for the user terminal and the MME executes the SGs association established for the user terminal in an evolved packet network, the MME carries out processing according to a signaling saving mechanism under a normal activated idle mode;

if the Gs interface information is that the SGSN can not establish Gs association for the user terminal and the MME executes to establish SGs association for the user terminal in an evolved packet network, the MME does not activate a signaling saving mechanism in an idle mode.

13. The MME apparatus of claim 12, wherein the Gs interface information acquiring unit acquires Gs interface information via a context message provided by SGSN or a message provided by a user.

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