CN102006643A

CN102006643A - Signaling optimization method and system for idle mode signaling reduction (ISR) functional deactivation executed by joint node

Info

Publication number: CN102006643A
Application number: CN2009100919231A
Authority: CN
Inventors: 王静; 梁爽; 陆光辉; 王志海
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-09-01
Filing date: 2009-09-01
Publication date: 2011-04-06

Abstract

The invention discloses a signaling optimization method and system for idle mode signaling reduction (ISR) functional deactivation executed by a joint node, wherein, a first serving gateway (S-GW) deletes the stored bearing information of the current user terminal (UE) according to a bearing deletion request sent by the joint node; and the first S-GW is triggered to a tunnel of a packet data network gateway (P-GW) and carries out bearing deletion. In the invention, the interoperability between the joint node and the S-GW can be simplified.

Description

Association node is carried out the signaling optimization method and system of ISR function deexcitation

Technical field

The present invention relates to communication technical field, be meant that especially a kind of association node application idle pulley signaling reduces the signaling optimization method and system of (ISR) function.

Background technology

In order to keep the competitiveness of 3-G (Generation Three mobile communication system) in the communications field, third generation partner program (3GPP, 3rd Generation Partnership Project) the standard operation group just is being devoted to the research of evolution grouping domain system (EPS, Evolved Packet System).

The EPS system configuration as shown in Figure 1, universal terrestrial access network (the E-UTRAN that mainly comprises evolution, Evolved Universal Terrestrial Radio Access Network) and packet-based core networks (EPC, Evolved Packet Core) two parts of evolution.EPC can support the user from global system for mobile communications (GSM, Global System for Mobile Communications)/enhanced data rates for gsm evolution technology (EDGE, Enhanced Data Rate for GSM Evolution) wireless access network (GERAN, GSM EDGE radio access network) and the access of universal land radio access web (UTRAN, UniversalTerrestrial Radio Access Network).

In EPC, mainly comprised home subscriber data server (HSS, Home SubscriberServer), Mobility Management Entity (MME, Mobility Management Entity), gateway (S-GW, Serving Gateway), grouped data network gateway (P-GW, PDN Gateway) and the service general packet radio service technical support node (SGSN, Serving GPRS Support Node), wherein:

HSS: the home subscriber data server is the permanent storage place of user contracting data, is positioned at the home network that the user contracts;

MME: Mobility Management Entity, be the storage place of user contracting data in current network, be responsible for Non-Access Stratum (NAS, Non-Access Stratum) signaling management, user tracking, paging management function and the bearer management under idle pulley of user terminal (UE) to network;

S-GW: gateway is the gateway of EPC to E-UTRAN, is responsible for UE to the user plane bearer of EPC, the metadata cache under the terminal idle pulley, function, Lawful Interception, grouped data route and the forwarding capability that network side is initiated service request;

P-GW: grouped data network gateway is the gateway of EPS system to external network, is responsible for the functions such as IP address assignment, billing function, grouping packet filtering and application of policies of UE;

SGSN: Serving GPRS Support Node, be the business support point that GERAN or UTRAN user insert the EPC network, similar on the function with MME, functions such as position renewal, paging management and the bearer management of responsible UE.

When the residing area of coverage of UE changes, for example from a kind of wireless access technology (RAT, when RadioAccess Technology) area of coverage moves to another RAT area of coverage, UE finds to have entered into a unregistered zone by monitoring broadcast channel, continuous in order to guarantee the business between UE and the EPC core net, UE need register at the new RAT area of coverage, therefore UE can initiate the tracing section updating (TAU of inter RAT, Tracking Area Update) or Routing Area Update (RAU, Routing Area Update) flow process.And for the overlapping region that is positioned at the UTRAN/GERAN area of coverage and the E-UTRAN area of coverage, the perhaps bimodulus UE of close region, may be owing between two overlay areas, frequently move, perhaps reason such as signal strength signal intensity causes UE frequent initiation TAU or RAU flow process in two registration areas in overlapping region, so can cause white elephant to empty port load-supporting.Therefore, in the EPS system,, introduced the function that the idle pulley signaling reduces (ISR, Idle modeSignaling Reduction) in order to reduce the space interface signaling between UE and the EPC core net.Activated after the ISR function, had the UE of UTRAN/GERAN and E-UTRAN access function simultaneously, can be registered to MME and SGSN simultaneously.So, the UE that has activated the ISR function the close region or the overlapping region of two kinds of areas of coverage just can not be frequent again initiation TAU or RAU flow process, thereby reduced unnecessary space interface signaling, saved valuable interface-free resources.In order to guarantee the normal use of ISR function, MME and SGSN need preserve the contextual information of UE respectively, and S-GW will keep the beared information of UE under two kinds of different radio access technologies.

Association node also claims the Combo node, is a kind of special physical node that produces in the network evolution process.The function of it is integrated SGSN and MME, with the interface conversion between two network elements be internal interface, as interface S3 among Fig. 1, sharing users data and physical memory can reduce the number of times of network element information interaction.The Combo node is simple and can reduce Signalling exchange time delay between network element in the network upgrade deploy, and most operators can adopt this mode when disposing the EPS system.

The Combo node is used and to be used the ISR function under ISR function and the distributed deployment scene and compared more superiority, the EPC core net need be preserved the contextual information (comprising mobility context and bearer context) of UE simultaneously in order to support the ISR function on SGSN and MME.When initiating ISR activation, deexcitation, carrying synchronizing process, all can increase the transmission of messages between SGSN and the MME, and for the Combo node, it is integrated in SGSN and MME on the unified physical node, the use of inner S3 interface can reduce the interoperability between SGSN and the MME, comprises the mutual of information.

Reasons such as UE shutdown, network cancellation, S-GW change can cause that all the ISR function can't keep (being the deexcitation of ISR function), the EPC core net needs mechanism to guarantee to discharge useless UE contextual information and beared information, and the ISR state of synchronous UE and EPC core-network side mobility management unit (MME, SGSN) is in case the asynchronous flow process mistake that causes of the waste of information resources and ISR state.

In disposing the application of Combo node, ISR function deactivating operation flow process wherein, had been bound the ISR function between the old MME of Combo intra-node and the old SGSN as shown in Figure 2 when S-GW changed at present.

Step 201, because position change has taken place in UE, be registered to a new MME/SGSN (new MME and new SGSN have bound the ISR function), reasons such as this new MME/SGSN topology Network Based, protocol type may be reselected a new S-GW and be this user's service, in this case, the ISR function of binding between old MME of standard protocol specifies and the old SGSN can't keep.In order to make the customer service maintenance continuously, in the TAU/RAU process, need to carry out the mutual of contextual information between new MME/SGSN and the old MME/SGSN, can learn by the old MME/SGSN of this process and for the S-GW that UE serves change take place this moment.

When old MME/SGSN learns the S-GW for the UE service change has taken place, so current old MME or old SGSN are the deexcitation of ISR function with the ISR state recording of self just, and send the deleting bearing request to old S-GW, ask old S-GW to discharge useless beared information.Can not keep owing to the ISR function this moment, therefore current old MME or old SGSN just increase the deleting load-bearing indication in the deleting bearing request message, notify old S-GW to be initiated to the deleting bearing request of the old mobility management unit of Combo intra-node another one (MME or SGSN).If current old mobility management unit is MME, then the old mobility management unit of another one is the SGSN that has bound the ISR function with this MME.

Step 202～203, old S-GW deletes and current old MME or the relevant beared information of old SGSN according to the deleting bearing request; Execution in step 203 then, reply the deleting bearing response to current old MME or old SGSN, and old S-GW is the deexcitation of ISR function with self ISR state recording.

Step 204, if have the deleting load-bearing indication in the deleting bearing request that old S-GW receives, it will initiate the deleting bearing request to the old mobility management unit of another one (MME or SGSN) so, and at this locality deletion beared information relevant with this mobility management unit.

Step 205, the old mobility management unit of another one (MME or SGSN) is replied the deleting bearing response to old S-GW after information such as the beared information of relevant this UE of this locality deletion and context.

Step 206 after the beared information of upward relevant this UE of old S-GW is all deleted, is initiated the deleting bearing request to P-GW, tunnel and beared information between deletion S-GW and the P-GW.

Step 207, P-GW returns the deleting bearing response to S-GW, confirms that the beared information in this section tunnel is deleted.

Above-mentioned mechanism is used not enough optimization for the ISR under the Combo node deployment situation, when S-GW oppositely triggers the deexcitation of mobility management unit ISR function, increased the Signalling exchange between Combo node and S-GW: promptly will be initiated to the deleting bearing request of another mobility management unit of Combo intra-node, so just make the interoperability more complicated between Combo node and the S-GW.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of association node to carry out the signaling optimization method and system of ISR function deexcitation, can simplify the interoperability between association node and the S-GW.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides a kind of association node and carry out the signaling optimization method of ISR function deexcitation, this method comprises:

The first gateway S-GW deletes the beared information of active user's terminal UE of self storing according to the deleting bearing request that association node sends;

A described S-GW is toggled to tunnel and the deleting load-bearing of packet data gateway P-GW.

Wherein, comprise in the described association node: first mobility management unit and second mobility management unit;

When described first mobility management unit was Mobility Management Entity MME, described second mobility management unit was service universal grouping wireless service technology support node SGSN; When described first mobility management unit was SGSN, described second mobility management unit was MME.

First mobility management unit in the described association node sends the deleting bearing request to a described S-GW, is specially:

Routing Area Update request or tracing section updating request that the 3rd mobility management unit sends according to UE send context request to described first mobility management unit, obtain the contextual information of UE;

Described first mobility management unit feeds back to described the 3rd mobility management unit by context response with described contextual information;

Described the 3rd mobility management unit is served for it for the user selects the 2nd S-GW after obtaining the contextual information of UE, and confirms to inform that by context described first mobility management unit is that the S-GW of UE service changes;

Described first mobility management unit confirms that according to described context the idle pulley signaling minimizing ISR state recording with self is the deexcitation of ISR function, and sends the deleting bearing request to a described S-GW.

When described first mobility management unit and second mobility management unit shared overlapped the contextual information of UE, this method further comprised:

Described first mobility management unit learns that described first mobility management unit and second mobility management unit were the deexcitation of ISR function with the ISR state recording of self simultaneously when the S-GW that serves for UE changed.

UE sends Routing Area Update request or tracing section updating request to the 3rd mobility management unit, is specially:

When UE moves to new route district, described Routing Area Update request is sent to described the 3rd mobility management unit by radio network controller (RNC);

Perhaps, when UE moves to tracking area outside the tracking area tabulation of self storage, described tracing section updating request is sent to described the 3rd mobility management unit by the base station.

When described the 3rd mobility management unit was MME, described first mobility management unit was MME; When described the 3rd mobility management unit was described SGSN, described first mobility management unit was SGSN.

The beared information of the current UE of described S-GW deletion self storage is specially:

When the ISR function that a described S-GW does not write down described association node has activated, cause value according to the association node ISR function deexcitation of carrying in the described deleting bearing request, judge that described first mobility management unit is arranged in the described association node that the ISR function has activated, and delete the beared information of the UE that self stores.

When the ISR function that a described S-GW has write down described association node has activated,, when judging described deleting bearing request, delete the beared information of the UE of self storage from described association node according to the bearing tunnel sign of carrying in the described deleting bearing request.

The beared information of described UE comprises: the beared information that described first mobility management unit is relevant with second mobility management unit.

A described S-GW is toggled to tunnel and the deleting load-bearing of packet data gateway P-GW, is specially:

After the beared information of described S-GW deletion UE, send the deleting bearing request to described P-GW; Described P-GW deletes a described S-GW and tunnel between self and beared information according to the tunnel between deletion the one S-GW and the P-GW and the indication of beared information in the described deleting bearing request, and returns the deleting bearing response to a described S-GW.

Described P-GW is after a S-GW returns the deleting bearing response, and this method further comprises:

After deleting bearing response confirmation self that a described S-GW returns according to P-GW and the tunnel between the P-GW and the beared information deletion, notify the beared information of the first mobility management unit UE and tunnel and the beared information between a S-GW and the P-GW all to delete by the deleting bearing response.

When the contextual information of UE is overlapped in the common use one of first mobility management unit and second mobility management unit, and first mobility management unit knows that this method further comprises: described association node is finished the deexcitation of ISR function after the beared information and tunnel between a S-GW and the P-GW and the whole deletions of beared information of UE;

When first mobility management unit and second mobility management unit are used the contextual information of a cover UE separately, and first mobility management unit is known after the beared information and tunnel between a S-GW and the P-GW and the whole deletions of beared information of UE, this method further comprises: the contextual information that described first mobility management unit is informed the UE of second mobility management unit deletion self storage by notice of cancellation, described association node is finished the deexcitation of ISR function.

The present invention also provides a kind of association node to use the signaling optimization system of ISR function, and this system comprises: association node, a S-GW and P-GW, wherein,

Described association node is used for sending the deleting bearing request to a described S-GW;

A described S-GW is used for deleting the beared information of the current UE of self storing according to described deleting bearing request; Also be used to be toggled to tunnel and the deleting load-bearing of described P-GW;

Described P-GW is used to carry out tunnel and the deleting load-bearing of a described S-GW to self.

Described association node comprises first mobility management unit; This system further comprises: the 3rd mobility management unit, UE and the 2nd S-GW;

Described the 3rd mobility management unit is used for Routing Area Update request or tracing section updating request according to the UE transmission, serves for it for UE selects the 2nd S-GW, and informs that described first mobility management unit is that the S-GW that UE serves changes;

Accordingly, described first mobility management unit is used for when the S-GW that is known as UE service changes, and is the deexcitation of ISR function with self ISR state recording, and sends the deleting bearing request to a described S-GW.

Described association node further comprises second mobility management unit;

When described second mobility management unit and described first mobility management unit shared overlapped the contextual information of UE, and when the S-GW that described first mobility management unit is known as UE service changed, the ISR state recording that described second mobility management unit is used for self was the deexcitation of ISR function.

A described S-GW is further used for, and executes a described S-GW to the tunnel of self with during deleting load-bearing at described P-GW, notifies the beared information of the first mobility management unit UE and tunnel and the beared information between a S-GW and the P-GW all to delete;

Accordingly, when described second mobility management unit and described first mobility management unit are used the contextual information of a cover UE separately, the contextual information of the UE that the notice of cancellation deletion that second mobility management unit sends according to described first mobility management unit self is stored.

Association node of the present invention is used in the signaling optimization scheme of ISR function, when the ISR function that does not write down association node at old S-GW has activated, in the deleting bearing request that old S-GW sends, carry the cause value of indication Combo node ISR function deexcitation in the first old mobility management unit, make old S-GW can directly delete the beared information (comprising the beared information that first, second old mobility management unit is relevant) of the UE that self stores according to this cause value; When the ISR function that has write down association node at old S-GW has activated, old S-GW can be directly according to the bearing tunnel sign of carrying in the deleting bearing request, when judging the deleting bearing request from association node, the beared information that can directly delete the UE that self stores comprises the beared information that first, second old mobility management unit is relevant), so, old S-GW just can be initiated to the deleting bearing request of the second old mobility management unit, has simplified the Signalling exchange between old S-GW and the Combo node.

Description of drawings

Fig. 1 is an EPS system configuration schematic diagram;

Fig. 2 is during prior art Combo node is used, ISR function deactivating operation schematic flow sheet when S-GW changes;

Fig. 3 carries out the signaling optimization method flow schematic diagram of ISR function deexcitation for association node of the present invention;

Fig. 4 initiates the Signalling exchange schematic diagram of ISR function deactivating operation embodiment one for SGSN in the Combo node of the present invention;

Fig. 5 initiates the Signalling exchange schematic diagram of ISR function deactivating operation embodiment one for MME in the Combo node of the present invention;

When Fig. 6 activates the ISR function for Combo node of the present invention, the Signalling exchange figure between each network element;

Fig. 7 initiates the Signalling exchange schematic diagram of ISR function deactivating operation embodiment two for SGSN in the Combo node of the present invention;

Fig. 8 initiates the Signalling exchange schematic diagram of ISR function deactivating operation implementation column two for MME in the Combo node of the present invention;

Fig. 9 uses the signaling optimization system configuration schematic diagram of ISR function for association node of the present invention.

Embodiment

The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.

The flow process of the signaling optimization method of Combo node application ISR function of the present invention comprises as shown in Figure 3:

Step 301, a S-GW deletes the beared information of the current UE of self storing according to the deleting bearing request that association node sends.

Step 302, a S-GW is toggled to tunnel and the deleting load-bearing of P-GW.

Association node comprises first mobility management unit and second mobility management unit among the present invention, and when first mobility management unit was MME, second mobility management unit was SGSN; When first mobility management unit was SGSN, second mobility management unit was MME.In addition, in optimization flow process of the present invention, also be applied to the 3rd mobility management unit, when initiating Routing Area Update or tracing section updating for UE, radio network controller (RNC, Radio Network Controller) or base station are the mobility management unit that UE selects; With first mobility management unit and second mobility management unit Comparatively speaking, the 3rd mobility management unit can be referred to as new mobility management unit, then first and second mobility management unit are referred to as old mobility management unit.

In addition, an above-mentioned S-GW is that UE initiates before Routing Area Update or the tracing section updating, the S-GW of service is provided for UE, and UE initiates after Routing Area Update or the tracing section updating, above-mentioned new mobility management unit need be selected one the 2nd S-GW for the UE gravity treatment and serve for it, therefore, the relative S-GW of the 2nd S-GW is new S-GW, and then a S-GW is old S-GW.

Below, by specific embodiment the scheme that the present invention is shown in Figure 3 is described.

Figure 4 shows that the Signalling exchange schematic diagram of SGSN initiation ISR function deactivating operation embodiment one in the Combo node, comprising:

Step 401, UE initiates the Routing Area Update request to new SGSN.

The district will initiate the Routing Area Update request if UE moves to new route, and radio network controller (RNC, Radio Network Controller) can be routed to new SGSN with the Routing Area Update request.Temporary mark (TIN, Temporary Identity used in Next update) the value setting that UE uses according to next update reports casual user's identification information of new SGSN, is carried in the Routing Area Update request.

Step 402, the old SGSN of new SGSN in the Combo node sends context request.

Casual user's identification information that new SGSN reports according to UE finds the old SGSN in the Combo node, and concurrent serving hereinafter asked, to obtain the contextual information of UE.

Step 403, old SGSN returns context response to new SGSN.

Old SGSN in the Combo node feeds back to new SGSN by context response with contextual informations such as user's permanent identification, authentication parameter, old S-GW address and Tunnel Identifier, user EPC core net abilities.

Step 404, new SGSN returns context to old SGSN and confirms.

Reasons such as new SGSN topology Network Based, network protocol type are reselected a new S-GW and are this user's service to repeat no more herein for prior art; In this case, new SGSN confirms the old SGSN of informing in the Combo node is indicated in the S-GW change by context.

Step 405, old SGSN sends the deleting bearing request to old S-GW, carries a cause value in this request and is used to indicate the deexcitation of Combo node ISR function.

Old SGSN in the Combo node is confirmed by context, learn that change has taken place the S-GW for the UE service, then old SGSN is the deexcitation of ISR function with the ISR state recording of self, simultaneously send the deleting bearing request to old S-GW, carry a cause value, be used to indicate the deexcitation of Combo node ISR function, be arranged in the Combo node that the ISR function has activated to inform this old SGSN of old S-GW.Old S-GW is according to Combo node ISR function deexcitation cause value, at the beared information (comprising the beared information relevant with old MME) of local this UE that stores of deletion, do not need another mobility management unit (being old MME herein) to send the deleting bearing request to the Combo intra-node with old SGSN.But so just simplify the interoperability between Combo node and the S-GW.

Step 406, old S-GW sends the deleting bearing request to P-GW.

Among the old S-GW about the beared information of this UE all deleted after, initiate the deleting bearing request to P-GW, the cause value of association node ISR function deexcitation is not carried in deleting bearing request in this step, can inform that by this deleting bearing request P-GW need delete tunnel and the beared information between S-GW and the P-GW, concrete, can in the deleting bearing request, carry an indication as required, be used to inform P-GW deletion S-GW and tunnel between self and beared information.

Step 407, P-GW returns the deleting bearing response to old S-GW.

The response of this deleting bearing is used for confirming that to old S-GW the beared information in this section tunnel deletes.

Step 408, old S-GW sends the deleting bearing response to old SGSN.

The old SGSN of old S-GW in the Combo node replied the deleting bearing response, informs the old SGSN beared information relevant with the ISR function of this Combo node (tunnel and beared information between the beared information of UE and old S-GW and the P-GW) all deletions.

Step 409, old SGSN sends notice of cancellation to old MME.

When old SGSN and old MME use the contextual information of a cover UE separately, the contextual information that the old SGSN of Combo intranodal is informed the old MME deletion UE of Combo intranodal by notice of cancellation (sending notice of cancellation by internal interface), this moment, association node was finished the deexcitation of ISR function.

If the contextual information of the shared cover UE of the SGSN of Combo intra-node and MME, so when old SGSN learns that the S-GW that serves into UE changes, old MME and old SGSN are the deexcitation of ISR function with the ISR state recording of self simultaneously, the contextual information of shared UE is not deleted, and does not just need the notifying operation of internal interface yet.Then old SGSN knows that when the beared information relevant with the ISR function of this Combo node all deleted, association node was finished the deexcitation of ISR function in step 408.

Therefore step 409 is optional.

Step 410 is finished follow-up Routing Area Update process.

Be existing procedure herein, repeat no more.

Figure 5 shows that the Signalling exchange schematic diagram of MME initiation ISR function deactivating operation embodiment one in the Combo node, comprising:

Step 501, UE is to the request of new MME initiating updating of tracking area.

If UE moves to the tracking area outside the tracking area tabulation of self storing, then UE just needs the initiating updating of tracking area request, and the base station can be routed to the tracing section updating request new MME.UE is provided with the casual user's identification information report new MME according to the TIN value, is carried in the more capable request of tracking area.

Step 502, the old MME of new MME in the Combo node sends context request.

Casual user's identification information that new MME reports according to UE finds the old MME in the Combo node, and concurrent serving hereinafter asked, to obtain the contextual information of UE.

Step 503, old MME returns context response to new MME.

Old MME in the Combo node feeds back to new MME by context response with contextual informations such as user's permanent identification, authentication parameter, old S-GW address and Tunnel Identifier, user EPC core net abilities.

Step 504, new MME returns context to old MME and confirms.

New MME is according to the contextual information of UE, and reasons such as topology Network Based, protocol type reselect a new S-GW and serve for this user, repeats no more for prior art herein; In this case, new MME confirms the old MME that informs in the Combo node is indicated in the S-GW change by context.

Step 505, old MME sends the deleting bearing request to old S-GW, carries a cause value in this request and is used to indicate the deexcitation of Combo node ISR function.

Old MME in the Combo node confirms by context, learn that change has taken place the S-GW for the UE service, then old MME is the deexcitation of ISR function with the ISR state recording of self, simultaneously send the deleting bearing request to old S-GW, carry a cause value, be used to indicate the deexcitation of Combo node ISR function.Old S-GW is according to Combo node ISR function deexcitation cause value, at the beared information (comprising the beared information relevant with old MME) of local this UE that stores of deletion, do not need another mobility management unit (being old SGSN herein) to send the deleting bearing request to the Combo intra-node with old SGSN.

Step 506, old S-GW sends the deleting bearing request to P-GW.

This step is identical with step 406 processing, repeats no more.

Step 507, P-GW returns the deleting bearing response to old S-GW.

This step is identical with step 407 processing, repeats no more.

Step 508, old S-GW sends the deleting bearing response to old MME.

The old MME of old S-GW in the Combo node replys the deleting bearing response, informs the old MME beared information relevant with the ISR function of this Combo node (tunnel and beared information between the beared information of UE and old S-GW and the P-GW) all deletions.

Step 509, old MME sends notice of cancellation to old SGSN.

The processing of this step repeats no more with step 409 herein.

Step 509 also is optional.

Step 510 is finished follow-up Routing Area Update process.

Be existing procedure herein, repeat no more.

When being illustrated in figure 6 as Combo node activation ISR function, the Signalling exchange figure between each network element comprises:

Step 601, MME or the SGSN of UE in the Combo node sends tracking area or Routing Area Update request.

If UE moves to the tracking area outside the tracking area tabulation of self storing, perhaps move to new route district, UE will initiate tracking area or Routing Area Update request; Accordingly, base station or RNC can be routed to a MME or a SGSN in the Combo node with tracking area or Routing Area Update request.UE is provided with the casual user's identification information report MME or SGSN according to the TIN value, is carried in tracking area or the Routing Area Update request.

Step 602, current MME or SGSN another SGSN or the MME in the Combo node sends context request.

Casual user's identification information that MME reports according to UE finds the SGSN in the Combo node, obtains the contextual information of UE;

Casual user's identification information that SGSN reports according to UE finds the MME in the Combo node, obtains the contextual information of UE.

This step was adhered in this EPC core net based on UE, and stored the contextual information of this UE among the MME of EPC core-network side or the SGSN.

Step 603, another SGSN or MME in the Combo node return context response to current MME or SGSN.

Another SGSN in the Combo node or MME be by context response, gives current MME or SGSN with feedback information such as user's permanent identification, authentication parameter, S-GW address and Tunnel Identifier, user EPC core net abilities.

Step 604, current MME or SGSN another SGSN or the MME in the Combo node returns the context affirmation.

Current MME or SGSN are according to the ISR activation condition, when judgement can activate the ISR function, current MME or SGSN activate the ISR function of self, and the ISR that carries the Combo node in context is confirmed activates indication, and send to another SGSN or MME in the Combo node, this moment the Combo intra-node another SGSN or the MME ISR function that also activated self, then the ISR of Combo intra-node activates and finishes; Simultaneously, current MME or SGSN can keep the contextual information of this UE.Wherein, judge that whether the ISR function can activate to existing normal process, repeats no more herein.

Step 605, current MME or SGSN send the bearing modification request to S-GW.

If the ISR function activation of Combo intra-node, so current MME or SGSN can carry a cause value in the bearing modification request, are used to indicate the ISR of Combo node to activate.This moment, S-GW was when receiving the bearing modification request, and according to the active information of this cause value in the ISR function of self record Combo node, be about to cause value: the ISR of Combo node activates in the bearer context information that is kept at the UE that self generates.

When the S-GW for UE service does not change (in the process that association node ISR activates, the S-GW that serves for UE can not change), according to the needs of network, can select whether execution in step 606～607:S-GW is by the bearing modification request, the positional information of current UE is sent to P-GW; P-GW returns the bearing modification response to S-GW, has acknowledged receipt of the positional information of UE, and execution in step 608 then.The positional information of UE can report current MME or SGSN by the tracking area or the Routing Area Update request of step 601, and the bearing modification request by step 505 reports S-GW again.

Step 608, S-GW returns the bearing modification response to current MME or SGSN.

The request of corresponding step 605 bearing modification, S-GW returns the bearing modification response to current MME or SGSN, activate with the ISR function that confirms the Combo node, and preserve the beared information (beared information that comprise MME and SGSN correspondence) of UE under two kinds of wireless access technologys.

Step 609 is finished follow-up tracking area or Routing Area Update process.

Can inform UE by this process, the ISR function of Combo node activates, and then UE can reset the TIN value according to the ISR state of activation.

Fig. 7 is the Signalling exchange schematic diagram that SGSN initiates ISR function deactivating operation embodiment two in the Combo node, comprising:

Step 701 during Combo node ISR function activation, adopts method shown in Figure 6 active information in old S-GW record Combo node ISR function, and the processing of step 605 repeats no more herein in the processing corresponding diagram 6 of this step.

The processing of step 702～step 711 repeats no more with the processing of step 401～step 410 herein.

It is to be noted, old SGSN is in the deleting bearing request that old S-GW sends in the step 405, carried the cause value of indication Combo node ISR function deexcitation, to inform that this old SGSN of old S-GW is arranged in the Combo node that the ISR function has activated, old S-GW needs to delete according to above-mentioned cause value the beared information (beared information that comprises old MME and old SGSN correspondence) of this UE of local storage; And old SGSN does not carry the cause value of indication Combo node ISR function deexcitation in the step 706 in the deleting bearing request that old S-GW sends, old S-GW only need identify by the bearing tunnel in the deleting bearing request, judge that this request comes from the Combo node and gets final product, because old S-GW has write down the active information of Combo node ISR function in the step 701, the ISR function of promptly having learnt the Combo node is activated, therefore, old S-GW can directly delete the beared information (beared information that comprises old MME and old SGSN correspondence) of this UE of local storage, do not need the old MME transmission deleting bearing request in the Combo node again, so simplified the interoperability between Combo node and S-GW.

Fig. 8 is the Signalling exchange schematic diagram that MME initiates ISR function deactivating operation embodiment two in the Combo node, comprising:

Step 801 during Combo node ISR function activation, adopts method shown in Figure 6 active information in old S-GW record Combo node ISR function, and the processing of step 605 repeats no more herein in the processing corresponding diagram 6 of this step.

The processing of step 802～step 811 repeats no more with the processing of step 501～step 510 herein.

It is to be noted, it is to be noted, old MME is in the deleting bearing request that old S-GW sends in the step 505, carried the cause value of indication Combo node ISR function deexcitation, to inform that this old MME of old S-GW is arranged in the Combo node that the ISR function has activated, old S-GW needs to delete according to above-mentioned cause value the beared information (beared information that comprises old MME and old SGSN correspondence) of this UE of local storage; And old MME does not carry the cause value of indication Combo node ISR function deexcitation in the step 806 in the deleting bearing request that old S-GW sends, old S-GW only need identify by the bearing tunnel in the deleting bearing request, judge that this request comes from the Combo node and gets final product, because old S-GW has write down the active information of Combo node ISR function in the step 801, the ISR function of promptly having learnt the Combo node is activated, therefore, old S-GW can directly delete the beared information (beared information that comprises old MME and old SGSN correspondence) of this UE of local storage, do not need again the old SGSN in the Combo node to send the deleting bearing request, so simplified the interoperability between Combo node and S-GW.

In order to realize above-mentioned signaling optimization method, the present invention also provides a kind of association node to use the signaling optimization system of ISR function, and this system comprises as shown in Figure 9: association node 10, a S-GW 20 and a P-GW

30, wherein,

Association node 10 is used for sending the deleting bearing request to a S-GW 20;

The one S-GW 20 is used for according to the deleting bearing request, deletes the beared information of the current UE of self storing; Also be used to be toggled to tunnel and the deleting load-bearing of P-GW 30;

P-GW 30, are used to carry out tunnel and the deleting load-bearing of a S-GW 20 to self.

Association node 10 comprises first mobility management unit 11; This system further comprises: the 3rd mobility management unit 40, UE 50 and the 2nd S-GW 60;

The 3rd mobility management unit 40 is used for Routing Area Update request or tracing section updating request according to UE 50 transmissions, serves for it for UE 50 selects the 2nd S-GW 60, and informs that first mobility management unit 11 changes for the S-GW of UE 50 services;

Accordingly, first mobility management unit 11 is used for when the S-GW that is known as UE 50 service changes, and is the deexcitation of ISR function with self ISR state recording, and sends the deleting bearing requests to a S-GW 20.

Association node 10 further comprises second mobility management unit 12;

When second mobility management unit 12 and first mobility management unit 11 shared are overlapped the contextual information of UE 50, and when the S-GW that first mobility management unit 11 is known as UE 50 service changed, the ISR state recording that second mobility management unit 12 is used for self was the deexcitation of ISR function.

The one S-GW 20 is further used for, execute a S-GW 20 to the tunnel of self with during deleting load-bearing at P-GW 30, notify the beared information of the first mobility management unit 11UE 50 and tunnel and the beared information between a S-GW20 and the P-GW 30 all to delete;

Accordingly, when second mobility management unit 12 and first mobility management unit 11 are used the contextual information of a cover UE 50 separately, the contextual information of the UE 50 that the notice of cancellation deletion that second mobility management unit 12 sends according to first mobility management unit 11 self is stored.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1. an association node is carried out the signaling optimization method of ISR function deexcitation, it is characterized in that this method comprises:

2. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 1, it is characterized in that, comprise in the described association node: first mobility management unit and second mobility management unit;

3. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 2, it is characterized in that first mobility management unit in the described association node sends the deleting bearing request to a described S-GW, is specially:

4. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 3, it is characterized in that, when described first mobility management unit and second mobility management unit shared overlapped the contextual information of UE, this method further comprised:

5. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 3, it is characterized in that UE sends Routing Area Update request or tracing section updating request to the 3rd mobility management unit, is specially:

6. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 5, it is characterized in that when described the 3rd mobility management unit was MME, described first mobility management unit was MME; When described the 3rd mobility management unit was described SGSN, described first mobility management unit was SGSN.

7. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 6, it is characterized in that, the beared information of the current UE of described S-GW deletion self storage is specially:

8. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 6, it is characterized in that, the beared information of the current UE of described S-GW deletion self storage is specially:

9. according to the signaling optimization method of claim 7 or 8 described association nodes execution ISR function deexcitations, it is characterized in that the beared information of described UE comprises: the beared information that described first mobility management unit is relevant with second mobility management unit.

10. according to the signaling optimization method of claim 7 or 8 described association nodes execution ISR function deexcitations, it is characterized in that a described S-GW is toggled to tunnel and the deleting load-bearing of packet data gateway P-GW, is specially:

11. the signaling optimization method according to the deexcitation of the described association node execution of claim 10 ISR function is characterized in that described P-GW is after a S-GW returns the deleting bearing response, this method further comprises:

12. the signaling optimization method according to the deexcitation of the described association node execution of claim 11 ISR function is characterized in that,

13. an association node is used the signaling optimization system of ISR function, it is characterized in that this system comprises: association node, a S-GW and P-GW, wherein,

14. the signaling optimization system according to the described association node application of claim 13 ISR function is characterized in that described association node comprises first mobility management unit; This system further comprises: the 3rd mobility management unit, UE and the 2nd S-GW;

15. the signaling optimization system according to the described association node application of claim 14 ISR function is characterized in that described association node further comprises second mobility management unit;

16. the signaling optimization system according to claim 14 or 15 described association nodes application ISR functions is characterized in that,