CN101448251A - Method for assigning tunnel identifier and service gateway thereof - Google Patents
Method for assigning tunnel identifier and service gateway thereof Download PDFInfo
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- CN101448251A CN101448251A CNA200810095619XA CN200810095619A CN101448251A CN 101448251 A CN101448251 A CN 101448251A CN A200810095619X A CNA200810095619X A CN A200810095619XA CN 200810095619 A CN200810095619 A CN 200810095619A CN 101448251 A CN101448251 A CN 101448251A
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Abstract
The invention discloses a method for assigning a tunnel identifier. The method comprises the steps as follows: after confirming that idle mode signaling reduction function (ISR function) is triggered, a mobile management unit sends a load-establishing request message to a serving gateway; and responding to the load-establishing request message, the serving gateway assigns a new tunnel identifier to a mobile management entity. In addition, the invention also discloses a serving gateway. By adopting the technical proposal, the serving gateway can distinguish from which mobile management entity a subsequent control surface singling comes, and updating or deleting operations on corresponding load can be realized.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of method for assigning tunnel identifier and gateway.
Background technology
In order to keep the competitiveness of 3-G (Generation Three mobile communication system) in the communications field, 3GPP (3rdGeneration Partnership Project, third generation partner program) the standard operation group just is being devoted to the research of EPS (Evolved Packet System, evolution grouping domain system).
Whole EPS system as shown in Figure 1, mainly comprise E-UTRAN (EvolvedUniversal Terrestrial Radio Access Network, the universal terrestrial access network of evolution) and EPC (Evolved Packet Core, the packet-based core networks of evolution) two parts.The EPC of this system can support the access of user from GERAN (GSM EDGE radio accessnetwork, GSM EDGE wireless access network) and UTRAN (Universal TerrestrialRadio Access Network, universal land radio access web).
In the EPC packet-based core networks, mainly comprised HSS (Home SubscriberServer, the home subscriber data server), MME (Mobility Management Entity, mobile management entity), S-GW (Serving Gateway, gateway), P-GW (PDNGateway, grouped data network gateway) and SGSN (Serving GPRS Support Node, Serving GPRS Support Node), wherein:
HSS is the permanent storage place of user contracting data, is positioned at the home network that the user contracts;
MME is the storage place of user contracting data in current network, is responsible for NAS layer (Non-Access Stratum, the Non-Access Stratum) signaling management of terminal to network, tracking and paging management function and the bearer management under user's idle pulley;
S-GW is the gateway that core net arrives wireless system, is responsible for terminal to the user plane bearer of core net, the metadata cache under the terminal idle pulley, function, legal eavesdropping and grouped data route and the forwarding capability that network side is initiated service request;
P-GW is functions such as the gateway of EPS and this system's external network, the IP address assignment of responsible terminal, billing function, grouping packet filtering, application of policies;
SGSN is the business support point that GERAN and UTRAN user insert the EPC network, and is similar with MME on the function, is responsible for user's functions such as position renewal, paging management and bearer management.
As UE (User Equipment, subscriber equipment) the residing area of coverage changes, for example, from a kind of RAT (Radio Access Technology, when wireless access 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 core net, then need under the new RAT area of coverage, register, therefore, UE can initiate TAU (Tracking Area Update, tracing section updating) or RAU (Routing AreaUpdate, the Routing Area Update) flow process of inter RAT.Fig. 2 is that the UE that is registered under the UTRAN area of coverage moves to the TAU flow process that causes under the E-UTRAN area of coverage.For moving to UTRAN and cause the RAU flow process from E-UTRAN, similar with Fig. 2, do not give unnecessary details so do not do.As shown in Figure 2, comprise following processing:
Step 201, UE moves to the E-UTRAN area of coverage under the MME, sends the tracing section updating request to MME, and request is registered in new zone, carries the P-TMSI that UE distributes under SGSN in the request message;
Step 202, new MME finds old SGSN according to the P-TMSI sign, sends the context request signaling and carries out the context acquisition process;
Step 203, old SGSN sends to new MME with user's mobile management and beared information,, carries out context response that is;
Step 204 confirms that to context request promptly, context is confirmed after new MME receives corresponding information;
Step 205, new MME carries source GTP-C Tunnel Identifier and purpose GTP-C Tunnel Identifier to the request of S-GW starting update load bearing in the request message, and S-GW is the binding relationship of new bearer more;
Step 206, S-GW sends more new bearer request to P-GW, and parameters such as the address information of S-GW, tunnel identification information, access technology type are sent to P-GW;
Step 207, P-GW upgrades the context of oneself and returns more new bearer response message to S-GW, and the information content comprises the address of P-GW and Tunnel Identifier etc.;
Step 208, S-GW returns more the new bearer response to new MME, brings MME with the purpose GTP-C Tunnel Identifier of S-GW appointment, self address and the address of P-GW and tunnel information etc.
Step 209, new MME is by the change of location update message notice HSS registered location;
Step 210, HSS keeps single registration principle to UE, therefore sends the canceling position signaling to old SGSN, only safeguards the registration of new MME;
Step 211, old SGSN is to HSS home position cancellation response;
Step 212, HSS upgrades the position of new MME and confirms;
Step 213, effective in current tracking area if new MME confirms UE, then send tracing section updating and accept message to UE;
Step 214, if new MME is that UE has distributed a new GUTI sign by the TAU flow process, UE can the returning tracking district upgrades and finishes message and confirm to MME so.
Upgrade principle based on this position, if UE frequently moves between the UTRAN area of coverage or E-UTRAN, perhaps the frequent Acceditation Area that causes owing to reasons such as signal strength signal intensities in the area of coverage is selected all to cause a large amount of TAU or RAU flow process, and this can cause white elephant concerning eating dishes without rice or wine.Therefore, in the EPS system,, introduced the function of ISR (Idle mode SignalingReduction, space interface signaling reduces) in order to reduce the space interface signaling between UE and the core net.After having activated this function, have the UE of UTRAN and E-UTRAN access function simultaneously, can be registered to MME and SGSN simultaneously.Like this, frequent when mobile between two kinds of different access technologies as UE, UE just can not initiate TAU or the RAU of inter RAT, thereby has reduced unnecessary space interface signaling transmission.
UE activates the process of ISR and also finishes by TAU or RAU flow process, but different on some step.Below to adopt the TAU flow process to activate the ISR function be example that the two difference is highlighted with Fig. 3 situation is similar therewith owing to adopt the RAU flow process to activate the flow process of ISR function, does not give unnecessary details so do not do.As shown in Figure 3, comprise following processing:
Step 301, UE moves to the E-UTRAN area of coverage under the MME, except carry the P-TMSI that UE distributes under SGSN, also will carry the ability whether UE supports ISR in the tracing section updating request message that sends to MME;
Step 302, new MME finds old SGSN according to the P-TMSI sign, sends the context request signaling and carries out the context acquisition process;
Step 303, old SGSN sends to new MME with user's mobile management and beared information, and carries the ability of oneself whether supporting ISR in the context response information of returning;
Step 304, new MME judges whether to carry out ISR according to the contextual information of receiving from old SGSN and activates, activate if carry out ISR, so new MME in the context acknowledgement message of replying to old SGSN with on the ISR indication inform that old SGSN keeps the original contextual information of UE;
Step 305, new MME carries source GTP-C Tunnel Identifier and purpose GTP-C Tunnel Identifier to the request of S-GW starting update load bearing in the request message, and S-GW is the binding relationship of new bearer more.Upgrade in the bearing request message and also comprise the indication that activates ISR, the bearer context information that notice S-GW reservation UE has under old SGSN.
Step 306, because variation has taken place RAT, S-GW sends more new bearer request to P-GW;
Step 307, P-GW upgrades the context of oneself and returns more new bearer response message to S-GW;
Need to prove, if S-GW is constant, and RAT and the carrying all do not change, then step 306 and step 307 are not necessarily.
Step 308, S-GW returns more the new bearer response to new MME, brings MME with the purpose GTP-C Tunnel Identifier of S-GW appointment, self address and the address of P-GW and tunnel information etc.;
Step 309, new MME is by the change of location update message notice HSS position, and by the information notification HSS of respective identification with the ISR activation, HSS just keeps two log-on messages in E-UTRAN and two territories of UTRAN so, no longer sends canceling position information to old SGSN;
Wherein, for above-mentioned corresponding identification information, be to be designated as two registrations at present by existing position this message elements of updating type.
Step 310, judge whether UE has activated ISR, if HSS does not keep two registrations to UE, then send the canceling position signaling to SGSN, if activated ISR, therefore HSS keeps the registration in two PS territories to UE, so can not send the canceling position signaling to old SGSN, belongs to second kind of situation in this flow process;
Step 311, if SGSN receives the canceling position signaling, then SGSN can be to HSS home position cancellation response; Corresponding to step 310, in this flow process, need not home position cancellation response;
Step 312, HSS upgrades the position of new MME and confirms;
Step 313, effective in current tracking area if new MME confirms UE, then send tracing section updating and accept message to UE, MME activates by indication notice UEISR function in this message;
Step 314, if new MME is that UE has distributed a new GUTI sign by the TAU flow process, UE can the returning tracking district upgrades and finishes message and confirm to MME so.
When ISR activated, S-GW had kept the beared information of two access networks simultaneously, therefore need distinguish the chain of command information that comes from MME or SGSN, thereby guarantee the carrying under the correct access network is operated.Chain of command information between MME and the SGSN is transmitted by the GTP-C tunnel, and the source end in tunnel and destination adopt TEID to identify.
By above description as can be seen, at present, by the more new bearer request notice S-GW activation ISR function of step 305, this message indication S-GW is tied to new bearer information and former beared information on the GTP-C Tunnel Identifier of same destination.Like this, cause S-GW can not distinguish follow-up chain of command signaling, therefore, can not upgrade or deletion action corresponding carrying from which mobile management entity.
Summary of the invention
Consider it is from that S-GW can not distinguish follow-up chain of command signaling for which mobile management entity, and can not upgrade or the problem of deletion action and make the present invention corresponding carrying, for this reason, main purpose of the present invention is to provide a kind of method for assigning tunnel identifier and gateway, to address the above problem.
According to an aspect of the present invention, provide a kind of method for assigning tunnel identifier, be used to distribute Tunnel Identifier.
Method for assigning tunnel identifier comprises according to an embodiment of the invention: after confirming that carrying out space interface signaling minimizing function is the ISR function activation, mobility management unit sends to gateway and creates bearing request message; In response to creating bearing request message, gateway is that Mobility Management Entity distributes new Tunnel Identifier.
Preferably, said method further comprises: gateway returns to mobility management unit and creates carrying request response, and carries new Tunnel Identifier in creating carrying request response.
Wherein, carry ISR in the above-mentioned establishment bearing request message and activate indication, be used for indicating service gateway and activate the ISR function.
Based on foregoing, in response to above-mentioned establishment bearing request message, gateway obtains ISR and activates indication, and it is effective according to the Tunnel Identifier of the former mobility management unit of ISR activation indication maintenance, wherein, former mobility management unit is connected to the different wireless access system areas of coverage with mobility management unit.
Wherein, above-mentioned mobility management unit is a mobile management entity, and above-mentioned former mobility management unit is a Serving GPRS Support Node; Perhaps, above-mentioned mobility management unit is a Serving GPRS Support Node, and above-mentioned former mobility management unit is a mobile management entity.
Preferably, said method further comprises: gateway has activated the ISR function at local record.
Preferably, said method can further include: in response to the renewal/deleting bearing request from wireless access system, gateway judges that according to the purpose Tunnel Identifier that carries in the request of renewal/deleting bearing which mobility management unit the transmit leg of renewal/deleting bearing request is, and carries out corresponding bearer update/deletion action according to judged result.
Wherein, above-mentionedly carry out corresponding bearer update/deletion action according to judged result and be specially: judging under the situation of renewals/deleting bearing request from mobility management unit that gateway upgrades/deletion action the carrying of the tunnel foundation of the new Tunnel Identifier correspondence of using mobility management unit; Judging under the situation of renewal/deleting bearing request from former mobility management unit, gateway upgrades/deletion action the carrying that the tunnel of the Tunnel Identifier correspondence of using former mobility management unit is set up, wherein, former mobility management unit is connected to the different wireless access system areas of coverage with mobility management unit.
Preferably, under the situation that receives the deleting bearing request, said method further comprises: gateway in the local record deexcitation ISR function.
According to a further aspect in the invention, provide a kind of gateway.
Gateway according to the embodiment of the invention is used to the user who activates the ISR function to distribute Tunnel Identifier, wherein, Tunnel Identifier comprises first Tunnel Identifier and second Tunnel Identifier, first Tunnel Identifier be used to identify and Serving GPRS Support Node between the tunnel set up, second Tunnel Identifier be used to identify and mobile management entity between the tunnel set up, wherein, Serving GPRS Support Node is connected to the different wireless access system areas of coverage with mobile management entity.
In addition, above-mentioned gateway also is used to receive the renewal/deleting bearing request from wireless access system, and judge the transmission main body of renewal/deleting bearing request, and carry out corresponding bearer update/deletion action according to judged result according to the purpose Tunnel Identifier that carries in the request of renewal/deleting bearing.
Particularly, if judge that the transmission main body of renewal/deleting bearing request is a Serving GPRS Support Node, then gateway carrying that the tunnel that utilizes the first Tunnel Identifier correspondence is set up is upgraded/deletion action, if judge that the transmission main body of renewals/deleting bearing request is a mobile management entity, then gateway upgrades/deletion action the carrying of the tunnel foundation that utilizes the second Tunnel Identifier correspondence.
By technique scheme of the present invention, which mobile management entity can make gateway distinguish follow-up chain of command signaling is from, and has realized the operation that can upgrade or delete corresponding carrying.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of evolution packet network system configuration in the correlation technique;
Fig. 2 is the signaling process figure that carries out normal tracing section updating in the correlation technique;
Fig. 3 activates the signaling process figure that space interface signaling reduces function by the tracing section updating flow process in the correlation technique;
Fig. 4 is the flow chart according to the method for assigning tunnel identifier of the inventive method embodiment;
Fig. 5 is the signaling process figure that the tracing section updating flow process activates the ISR function that passes through according to the inventive method embodiment;
Fig. 6 is the signaling process figure that Routing Area Update activates the ISR function that passes through according to the inventive method embodiment;
Fig. 7 is the signaling process figure that carries out bearer update behind the ISR function activation according to the inventive method embodiment;
Fig. 8 is the signaling process figure that carries out deleting load-bearing behind the ISR function activation according to the inventive method embodiment; And
Fig. 9 is the schematic diagram according to the gateway of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Method embodiment
In the present embodiment, provide a kind of method for assigning tunnel identifier, be used to distribute Tunnel Identifier, as mentioned above, Tunnel Identifier comprises source Tunnel Identifier and purpose Tunnel Identifier.Fig. 4 is the flow chart according to the method for assigning tunnel identifier of the inventive method embodiment.
As shown in Figure 4, the method for assigning tunnel identifier according to the embodiment of the invention comprises:
S402, after confirming that carrying out the ISR function is the ISR function activation, mobility management unit (MME or SGSN) sends to S-GW and creates bearing request message, and S-GW is the new GTP-C Tunnel Identifier of distribution of messages in view of the above;
S404, in response to creating bearing request message, S-GW is that mobility management unit is distributed new GTP-C Tunnel Identifier, and has activated the ISR function at local record.
That is to say that S-GW has distributed 2 GTP-C Tunnel Identifiers simultaneously for the user who activates the ISR function, one be used for mutual with SGSN, one be used for MME mutual.Mobility management unit (MME or SGSN) adopts creates bearing request message notice S-GW activation ISR function, and distributes a new GTP-C Tunnel Identifier to give new mobility management unit.
After step S404, S-GW can return to mobility management unit and create carrying request response, and carries new GTP-C Tunnel Identifier in creating carrying request response.
In addition, carry ISR in the above-mentioned establishment bearing request message and activate indication, be used to indicate S-GW to activate the ISR function.This can realize by the mode that increases new information unit.Like this, S-GW can obtain ISR and activate indication, and keeps the GTP-C of former mobility management unit effective according to ISR activation indication, and wherein, former mobility management unit is connected to the different wireless access system areas of coverage with mobility management unit.Here, mobility management unit is MME, and former mobility management unit is SGSN; Perhaps, mobility management unit is SGSN, and former mobility management unit is MME.
That is to say, S-GW receives the establishment carrying request that has the ISR sign, for current mobility management unit is distributed a new GTP-C Tunnel Identifier, and be that the GTP-C Tunnel Identifier of mobility management unit of another network is effective before keeping, and activated the ISR state of this UE at local record.Like this, S-GW can distinguish this control signaling and by which kind of connecting system be sent, thereby corresponding carrying is operated according to the renewal that the has various objectives GTP-C Tunnel Identifier/deleting bearing request of receiving.Under the ISR state of activation, if S-GW receives the deleting bearing request from either party, all will be in the local record deexcitation ISR state of this UE.
Below, in conjunction with the accompanying drawings, be that example is described in detail technique scheme to activate the ISR function by the TAU flow process and to activate the ISR function by the RAU flow process.
Example 1: activate the ISR function by the TAU flow process
Fig. 5 is the signaling process figure that TAU activates the ISR function that passes through according to the inventive method embodiment.As shown in Figure 5, under the ISR unactivated state, carry out the ISR activation by the TAU flow process and may further comprise the steps:
Step 502, when UE moves to following time of coverage of E-UTRAN from UTRAN, the ability that UE supports ISR is carried in the request of UE initiating updating of tracking area in request message;
Step 504, the new MME under the E-UTRAN finds original SGSN, request contexts information according to old P-TMSI that carries in the tracing section updating request and old RAI information;
Step 506, SGSN originally carries the context of UE in the context response information of returning to new MME, and whether oneself supports the ability of ISR;
Step 508, new MME judges whether to carry out ISR and activates according to the indication whether SGSN from the context response information that old SGSN receives supports the ISR ability.Activate if carry out ISR, so new MME carries the ISR indication in the context acknowledgement message of replying to old SGSN, inform that old SGSN has activated ISR, and keeps the original contextual information of UE;
Step 510 activates if new MME confirms to carry out ISR, and it initiates to create the carrying request to S-GW so, allows the S-GW be the new GTP-C Tunnel Identifier of GTP-C tunnel distributing another one new between MME and the S-GW.And, also should comprise the indication that activates ISR in the establishment bearing request message, the GTP-C tunnel of setting up between notice S-GW reservation and the SGSN, and pass through the bearer context information that this tunnel is set up;
Step 512, S-GW sends more new bearer request to P-GW, and parameters such as the address information of S-GW, tunnel identification information, access technology type are sent to P-GW;
Step 514, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, and message content comprises the address of P-GW and Tunnel Identifier etc.; Need to prove, if S-GW is constant, and RAT and the carrying all do not change, then need not execution in step 512 and 514;
Step 516, S-GW returns to new MME and creates the carrying response, brings MME with the newly assigned purpose GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.;
Step 518, new MME is by the change of location update message notice HSS position, and by the information notification HSS of respective identification with the ISR activation, HSS just keeps two log-on messages in E-UTRAN and two territories of UTRAN so, no longer sends canceling position information to old SGSN; Wherein, above-mentioned corresponding identification information includes but are not limited to following mode: can be that special-purpose information unit indication ISR activates, or be designated as two registrations by existing position this message elements of updating type;
Step 520, HSS upgrades acknowledge message by the position and notifies the renewal of new MME position to finish;
Step 522, effective in current tracking area if new MME confirms UE, then send tracing section updating and accept message to UE, MME is by indication notice UE, ISR function activation in this message;
Step 524, if new MME is that UE has distributed a new GUTI sign by the TAU flow process, UE can the returning tracking district upgrades and finishes message and confirm to MME so.
By the example that provides above, realized the distribution of Tunnel Identifier by the TAU flow process.
Example 2: activate the ISR function by the RAU flow process
Fig. 6 is the signaling process figure that RAU activates the ISR function that passes through according to the inventive method embodiment.As shown in Figure 6, under the ISR unactivated state, the processing of carrying out the ISR activation by the RAU flow process may further comprise the steps:
Step 602, when UE moves to from E-UTRAN under the coverage of UTRAN, UE initiates the Routing Area Update request, carries the ability that UE supports ISR in request message;
Step 604, the old GUTI information that request is carried according to Routing Area Update of the new SGSN under the UTRAN finds original MME, request contexts information;
Step 606, MME originally carries the contextual information of UE in the context response information of returning to new SGSN, and whether oneself supports the ability of ISR;
Step 608, whether new SGSN supports the indication of ISR ability according to the MME from the context response information that old MME receives, judging whether to carry out ISR activates, if carried out the ISR activation, so new SGSN is in the context acknowledgement message of replying for old MME, carry the ISR indication and inform that old MME has activated ISR, and keep the original contextual information of UE;
Step 610 activates if new SGSN confirms to carry out ISR, and it initiates to create the carrying request to S-GW so, allows the S-GW be the new purpose GTP-C Tunnel Identifier of GTP-C tunnel distributing another one new between SGSN and the S-GW.Create in the bearing request message and also should comprise the indication that activates ISR, the GTP-C tunnel of setting up between notice S-GW reservation and the MME, and the bearer context information of passing through this tunnel foundation;
Step 612, S-GW sends more new bearer request to P-GW, and parameters such as the address information of S-GW, tunnel identification information, access technology type are sent to P-GW;
Step 614, P-GW upgrades the context of oneself and returns more new bearer response message to S-GW, and the information content comprises the address of P-GW and Tunnel Identifier etc.; Need to prove, if S-GW is constant, and RAT and the carrying all do not change, then need not execution in step 612 and 614;
Step 616, S-GW returns to new SGSN and creates the carrying response, brings SGSN with the newly assigned purpose GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.;
Step 618, new SGSN is by the change of location update message notice HSS position, and by the information notification HSS of respective identification with the ISR activation, HSS just keeps two log-on messages in E-UTRAN and two territories of UTRAN so, no longer sends canceling position information to old MME; Wherein, above-mentioned corresponding identification information includes but are not limited to following mode: can be that special-purpose information unit indication ISR activates, or be designated as two registrations by existing position this message elements of updating type;
Step 620, HSS upgrades acknowledge message by the position and notifies the renewal of new SGSN position to finish;
Step 622, effective in current route district if new SGSN confirms UE, then send Routing Area Update and accept message to UE, SGSN is by indication notice UE ISR function activation in this message;
Step 624, if new SGSN is that UE has distributed a new P-TMSI sign by the RAU flow process, UE can return Routing Area Update and finishes message and confirm to SGSN so.
By the example that provides above, realized the distribution of Tunnel Identifier by the RAU flow process.
Except above-mentioned processing, method for assigning tunnel identifier according to present embodiment can further include: in response to the renewal/deleting bearing request from wireless access system, S-GW judges that according to the purpose GTP-C Tunnel Identifier that carries in the request of renewal/deleting bearing which mobility management unit the transmit leg of renewal/deleting bearing request is, and carries out corresponding bearer update/deletion action according to judged result.Particularly, under the situation of judging the mobility management unit that the request of renewal/deleting bearing is made a fresh start, S-GW upgrades/deletion action the carrying that the tunnel of the new GTP-C Tunnel Identifier correspondence of use mobility management unit is set up; Judging under the situation of renewals/deleting bearing request from former mobility management unit that S-GW upgrades/deletion action the carrying of the tunnel foundation of the GTP-C Tunnel Identifier correspondence of using former mobility management unit.Wherein, former mobility management unit is connected to the different wireless access system areas of coverage with mobility management unit.In addition, under the situation that receives the deleting bearing request, S-GW also in the local record deexcitation ISR function.
Below, will be in conjunction with the accompanying drawings, and to carry out bearer update behind the ISR function activation and deletion action is an example, technique scheme is illustrated.
Carry out bearer update behind the example 3:ISR function activation
Fig. 7 is the signaling process figure that carries out bearer update behind the ISR function activation according to the inventive method embodiment.Need to prove, cause under the ISR state of activation that the triggering reason of the bearer update between MME and the S-GW comprises: service request flow process, S1 that TAU flow process, UE initiate in the MME area of coverage that ISR activates discharge flow process etc.
As shown in Figure 7, carrying out bearer update behind the ISR function activation mainly may further comprise the steps:
Step 702 is carried out the information interaction that TAU flow process, service request flow process, S1 discharge flow process etc. between UE and the MME, cause the bearer update between MME and the S-GW;
Step 704, new MME sends more new bearer request to S-GW, at this moment, no matter UE before had been under the UTRAN coverage of SGSN or had been under the E-UTRAN coverage of MME, the purpose GTP-C Tunnel Identifier (in this example be the purpose GTP-C Tunnel Identifier of distributing to old MME) of distributing to old Mobility Management Entity (in this example for old MME) when all activating with ISR carries out multiplexing, and notice S-GW binds the carrying of this purpose GTP-C and new MME;
Step 706, S-GW sends more new bearer request to P-GW, and parameters such as the address information of S-GW, tunnel identification information, access technology type are sent to P-GW;
Step 708, P-GW upgrades the context of oneself and returns more new bearer response message to S-GW, and the information content comprises the address of P-GW and Tunnel Identifier etc.; Need to prove, constant at S-GW, and under RAT and the carrying situation about all not changing, need not execution in step 706 and step 708;
Step 710, S-GW returns more the new bearer response to new MME, brings new MME with the address of the address of S-GW self, P-GW and tunnel identification information etc.;
Step 712 after more new bearer finishes, is carried out the mutual of response messages such as TAU flow process, service request flow process, S1 release flow process between UE and the MME;
In addition, behind the ISR function activation, it is also similar that service request flow process of initiating in the SGSN area of coverage that ISR activates by RAU flow process, UE and Iu mouth discharge SGSN and the more new bearer request processing mode between the S-GW that reason such as flow process causes, do not do at this and give unnecessary details.
Carry out deleting load-bearing behind the example 4:ISR function activation
Fig. 8 is the signaling process figure that carries out deleting load-bearing behind the ISR function activation according to the inventive method embodiment.Need to prove that under the ISR state of activation, cause that the reason of deleting bearing request between MME and the S-GW comprises TAU flow process, ISR deexcitation flow process, logout flow path etc., the process of deleting bearing request all adopts the processing mode of corresponding steps in this example.
As shown in Figure 8, carrying out deleting load-bearing behind the ISR function activation mainly may further comprise the steps:
Step 802 is carried out the information interaction of TAU flow process, ISR deexcitation flow process etc. between UE and the MME, these flow processs can cause the deleting load-bearing between old SGSN/MME and the S-GW;
Step 804, new MME is by the change of location update message notice HSS UE Location Registration, and indication HSS is to the maintenance or the deexcitation of ISR function;
Step 806, HSS judges whether to send the canceling position signaling to old SGSN or old MME according to principle that keeps registration and ISR state information (activating or deactivation); If keep the ISR function activation then do not send the canceling position signaling, if deexcitation ISR function then send the canceling position signaling;
Step 808, if old SGSN or old MME receive canceling position message, and the context request process finishes, the mobile management context of old SGSN or old MME deletion self is also confirmed to the cancellation of HSS home position; Need to prove that deletion action can be carried out immediately, perhaps by the mode of opening timing device, deletes behind the timer expiry after the request of receiving;
Step 810, HSS upgrades acknowledge message by the position and notifies the renewal of new MME position to finish;
Step 812, if old SGSN has been deleted the mobile management context in step 808, so only initiate the deleting bearing signaling to S-GW, wherein carrying S-GW is the destination sign in the GTP-C tunnel of SGSN distribution, if old MME has deleted the mobile management context in step 808, so old MME does not need to carry out this step.This be because, the GTP-C tunnel that uses between old MME and new MME and the S-GW is identical, and the TEID of multiplexing same destination, by step 802, old carrying has been updated to new carrying, does not then need to initiate the deleting bearing request;
Step 814, S-GW distinguishes that according to the destination sign in the GTP-C tunnel that carries in the deleting bearing request this request comes from that mobility management unit, the carrying that the S-GW deletion is set up by this GTP-C tunnel is made as deexcitation with the ISR state, and returns the deleting bearing response;
Step 816 after deleting bearing finishes, is carried out the mutual of response messages such as TAU flow process, logout flow path, ISR deexcitation flow process between UE and the MME.
In addition, behind the ISR function activation, by the RAU flow process carry out the flow process of deleting load-bearing and SGSN and the deleting bearing request processing mode between the S-GW that other reason causes also similar, do not do at this and to give unnecessary details.
Device embodiment
In the present embodiment, provide a kind of gateway.Fig. 9 is the schematic diagram according to the gateway of the embodiment of the invention.
Gateway according to the embodiment of the invention is used to the user who activates the ISR function to distribute Tunnel Identifier, wherein, Tunnel Identifier comprises first Tunnel Identifier (GTP-C1 comprises: source GTP-C1, purpose GTP-C1) and second Tunnel Identifier (GTP-C2 comprises: source GTP-C2, purpose GTP-C2), wherein, GTP-C1 is used to identify the tunnel of setting up between the SGSN, GTP-C2 be used to identify and MME between the tunnel set up, wherein, SGSN is connected to the different wireless access system areas of coverage with MME.Particularly, can be with reference to Fig. 9.
In addition, above-mentioned S-GW also is used to receive the renewal/deleting bearing request from wireless access system, and judge the transmission main body of renewal/deleting bearing request, and carry out corresponding bearer update/deletion action according to judged result according to the purpose Tunnel Identifier that carries in the request of renewal/deleting bearing.
Preferably, if judge that the transmission main body of renewal/deleting bearing request is SGSN, then S-GW carrying that the tunnel that utilizes the GTP-C1 correspondence is set up is upgraded/deletion action, if judge that the transmission main body of renewals/deleting bearing request is MME, then S-GW upgrades/deletion action the carrying of the tunnel foundation that utilizes the GTP-C2 correspondence.
In sum, by means of technical scheme of the present invention, which mobility management unit is the relevant chain of command signaling of renewal/deleting bearing that gateway is distinguished be from, thus the operation that can upgrade or delete corresponding carrying.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a method for assigning tunnel identifier is used to distribute Tunnel Identifier, it is characterized in that, described method comprises:
After confirming that carrying out space interface signaling minimizing function is the ISR function activation, mobility management unit sends to gateway and creates bearing request message;
In response to described establishment bearing request message, described gateway is that described Mobility Management Entity distributes described new Tunnel Identifier.
2. method according to claim 1 is characterized in that, further comprises:
Described gateway returns to described mobility management unit and creates carrying request response, and carries described new Tunnel Identifier in described establishment carrying request response.
3. method according to claim 1 is characterized in that, carries ISR in the described establishment bearing request message and activates indication, is used to indicate described gateway to activate the ISR function.
4. method according to claim 3 is characterized in that,
In response to described establishment bearing request message, described gateway obtains described ISR and activates indication, and it is effective according to the Tunnel Identifier of the former mobility management unit of described ISR activation indication maintenance, wherein, described former mobility management unit is connected to the different wireless access system areas of coverage with described mobility management unit.
5. method according to claim 4 is characterized in that, described mobility management unit is a mobile management entity, and described former mobility management unit is a Serving GPRS Support Node; Perhaps, described mobility management unit is a Serving GPRS Support Node, and described former mobility management unit is a mobile management entity.
6. method according to claim 3 is characterized in that, further comprises: described gateway has activated the ISR function at local record.
7. according to each described method in the claim 1 to 6, it is characterized in that, further comprise:
In response to renewal/deleting bearing request from wireless access system, described gateway judges according to the purpose Tunnel Identifier that carries in described renewal/deleting bearing request whether the transmit leg of described renewal/deleting bearing request is described mobility management unit, and carries out corresponding bearer update/deletion action according to judged result.
8. method according to claim 7 is characterized in that, describedly carries out corresponding bearer update/deletion action according to judged result and is specially:
Judging under the described renewal/situation of deleting bearing request that described gateway upgrades/deletion action the carrying that the tunnel of the described new Tunnel Identifier correspondence of using described mobility management unit is set up from described mobility management unit;
Judging under the described renewal/situation of deleting bearing request from former mobility management unit, described gateway upgrades/deletion action the carrying that the tunnel of the Tunnel Identifier correspondence of using described former mobility management unit is set up, wherein, described former mobility management unit is connected to the different wireless access system areas of coverage with described mobility management unit.
9. method according to claim 8 is characterized in that, under the situation that receives described deleting bearing request, described method further comprises:
Described gateway in the local record deexcitation ISR function.
10. gateway, it is characterized in that, described gateway is used to the user who activates the ISR function to distribute Tunnel Identifier, wherein, described Tunnel Identifier comprises first Tunnel Identifier and second Tunnel Identifier, described first Tunnel Identifier be used to identify and Serving GPRS Support Node between the tunnel set up, described second Tunnel Identifier be used to identify and mobile management entity between the tunnel set up, wherein, described Serving GPRS Support Node is connected to the different wireless access system areas of coverage with described mobile management entity.
11. gateway according to claim 10, it is characterized in that, described gateway also is used to receive the renewal/deleting bearing request from wireless access system, and judge the transmission main body of described renewal/deleting bearing request, and carry out corresponding bearer update/deletion action according to judged result according to the purpose Tunnel Identifier that carries in described renewal/deleting bearing request.
12. gateway according to claim 11, it is characterized in that, if judging the transmission main body of described renewal/deleting bearing request is described Serving GPRS Support Node, then described gateway upgrades/deletion action the carrying that the tunnel that utilizes the described first Tunnel Identifier correspondence is set up, if judging the transmission main body of described renewal/deleting bearing request is described mobile management entity, then described gateway upgrades/deletion action the carrying that the tunnel that utilizes the described second Tunnel Identifier correspondence is set up.
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