CN101282582B

CN101282582B - Switch method straddling wireless access technique

Info

Publication number: CN101282582B
Application number: CN2008100818876A
Authority: CN
Inventors: 梁爽; 王静; 朱进国; 卢飞; 叶敏雅
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-05-16
Filing date: 2008-05-16
Publication date: 2011-11-30
Anticipated expiration: 2028-05-16
Also published as: CN101282582A

Abstract

The invention relates to a handoff method crossing the wireless access technology, comprising: when UE is switched over from source wireless access network to target wireless access network, a source mobile management unit of the source wireless access network receives a handoff request and then sends a forwarding relocating request to a target mobile management unit of the target wireless access network; the request comprises an indication that the source mobile management unit is provided with ISR ability; if the target mobile management unit is provided with ISR ability and judges that S-GW need not be chosen for the UE again, ISR function of the UE is activated or kept, and the mark activating the ISR function is comprised in corresponding forwarding relocating response; after receiving the forwarding relocating response, the source mobile management unit activates or keeps the ISR function of the UE; the wireless access network is: UTRAN or E-UTRAN; the source mobile management unit and the target mobile management unit are separately source SGSN and target MME, or source MME and target SGSN.

Description

A kind of changing method of cross wireless access technology

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of method of switching at different wireless access technology (RadioAccess Technology the is called for short RAT) area of coverage.

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 (Evolved Universal Terrestrial Radio Access Network, the universal land radio access web of evolution) and EPC (Evolved Packet Core, the packet-based core networks of evolution) two parts.The EPC of this system can support the user from GERAN (GSM EDGE radio accessnetwork, global system for mobile communications enhanced data rates for gsm evolution technology wireless access network) and the access of UTRAN (Universal Terrestrial Radio Access Network, universal land radio access web).

In the EPC packet-based core networks, mainly comprise: HSS (Home Subscriber Server, the home subscriber data server), MME (Mobiliyt Management Entity, mobility management unit), S-GW (Serving Gateway, gateway), P-GW (PDN Gateway, grouped data network gateway) and SGSN (Serving GPRS Support Node, service general grouping service wireless 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 the grouping domain system (EPS) of evolution and the gateway of this system's external network, functions such as IP (Internet Protocol, the Internet Protocol) 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.

When the residing area of coverage of UE (User Equipment, user terminal) changes, for example be moved to another RAT area of coverage following time from a kind of RAT area of coverage, UE finds to have entered a unregistered zone by monitoring broadcast channel; Continuous in order to guarantee the business between UE and the core net, need under the new RAT area of coverage, register, therefore UE can initiate TAU (Tracking Area Update, tracing section updating) or RAU (Routing Area Update, the Routing Area Update) flow process of inter RAT (between RAT).And for the bimodulus UE of overlapping region that is positioned at the UTRAN area of coverage and the E-UTRAN area of coverage or close region, may owing between two overlay areas frequent move or in overlapping region reason such as signal strength signal intensity cause UE frequent initiation TAU or RAU flow process in two registration areas, this can cause white elephant concerning eating dishes without rice or wine.

Therefore, in order in the EPS system, to reduce the space interface signaling between UE and the core net, introduced ISR (Idle mode Signaling Reduction, the idle pulley signaling reduces) function.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 among said circumstances, the UE that has activated ISR two kinds of coverings close on or overlapping region just can frequently not initiated TAU or RAU flow process again, thereby reduced unnecessary space interface signaling, saved valuable interface-free resources.

Only considered at present how under idle condition, to activate or keep ISR and activate in the prior art, and,, then do not considered how to set up or keep the ISR function if the switching of the technology that spans into has taken place for the UE of connection status.

Fig. 2 moves to the switching flow that the area of coverage caused of UTRAN from the E-UTRAN area of coverage for the UE of connection status; Switching flow and flow process shown in Figure 2 that the E-UTRAN area of coverage caused are similar for moving to from UTRAN, and this paper repeats no more.The flow process of Fig. 2 may further comprise the steps:

Step 201, because the power of wireless side signal, the perhaps reasons such as decision-making of source eNB (evolved Node B), UE initiates switching flow, and determines to switch to UTRAN.

Step 202, source eNB initiates handoff request to source MME, carries in this request to cause the reason switched, Target RNC (Radio Network Controller, radio network controller) sign, source eNB sign and the carrying that need carry out data forwarding are tabulated.

Step 203, source MME finishes EPS and is carried to PDP (Packet Data Protocol, packet data protocol) after the contextual mapping, send forwarding re-positioning request (ForwardRelocation Request) to target SGSN, comprise in this request: the IMSI of UE (International Mobile SubscriberIdentifier, international mobile subscriber identity), the target SGSN sign, mobile management context and PDP Context, the tunnel end sign and the address of MME chain of command, and whether sign directly transmits the sign of data.

Step 204, target SGSN sends re-positioning request to Target RNC, and request target RNC sets up radio bearer, carries in this request: the sign of UE, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 205 is returned re-positioning request to target SGSN after the Target RNC distributing radio resource and is replied, and comprises during this is replied: the radio bearer tabulation that success is set up and the radio bearer tabulation of foundation failure.

Step 206, target SGSN are returned to source MME and are transmitted relocation response (Forward RelocationResponse), carry SGSN chain of command tunnel end sign and address in this response, radio bearer setup message, and the tunnel end sign and the address of data forwarding.

Step 207, source MME sends switching command to source eNB, comprising the carrying tabulation of carrying out data forwarding.

Step 208, source eNB sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 209～211, source eNB transmits SRNS (SRNS Serving Radio Network Subsystem) context by source MME and target SGSN to Target RNC.

After the SRNS context is received in step 212～214, Target RNC, return forwarding SRNS context by target SGSN and source MME to source eNB and reply.

Step 215, UE finishes and is linked into after the Target RNC, sends handoff completion message to Target RNC.

Step 216, Target RNC have been finished source eNB and finished message to target SGSN transmission reorientation after the reorientations of Target RNC.

Step 217, target SGSN send to transmit to be redirected to source MME finishes (Forward RelocationComplete) message, and notification target SGSN switching is finished.

Step 218, source MME send to transmit is redirected to finish to target SGSN and replys (ForwardRelocation Complete Acknowledge), and MME opens a timer, is used to determine when to discharge wireless and arrives the bearing resource of S-GW.

Step 219, target SGSN is carried in this request message to the request of S-GW starting update load bearing: source GTP-C (GPRS Tunnel Protocol chain of command) Tunnel Identifier and target GTP-C Tunnel Identifier, S-GW is the binding relationship of new bearer more.

Step 220, 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 221, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries the address of P-GW and Tunnel Identifier etc. in this message.

Step 222, S-GW returns more the new bearer response to target SGSN, and the target GTP-C Tunnel Identifier of S-GW appointment, self address and the address of P-GW and tunnel information etc. are returned to target SGSN.

Step 223, switching is finished, and the up-downgoing data transmit by the system after switching.

Step 224, UE finds to have inserted a unregistered route district by the monitoring wireless channel, therefore initiates the Routing Area Update request, request is in new route district registration, the sign of carrying UE in this request.

Step 225, target SGSN can be carried out authentication and licensing process to UE at this moment.

Step 226, target SGSN is by the change of this UE registered location of location update request message notice HSS.

Step 227, therefore HSS sends the canceling position request to source MME to single registration of UE holding position information, only safeguards the registration of target SGSN.

Step 228, source MME is to HSS home position cancellation response.

Step 229, HSS inserts user data to target SGSN.

Step 230, target SGSN is returned the insertion user data to HSS and is replied.

Step 231, HSS confirms the position updating request of target SGSN by send position renewal response to target SGSN.

Step 232 if target SGSN confirms that UE is effective in current route district, then sends Routing Area Update to UE and accepts message.

Step 233, if target SGSN is that UE has distributed a new P-TMSI (Packet-Temporary Mobile Subscriber Identity by the RAU flow process, packet domain mobile subscriber's temporary identifier), UE can return Routing Area Update and finishes message and confirm to target SGSN so.

As from the foregoing, in the prior art, if UE has activated the ISR function, owing to do not have related mechanism to safeguard or rebuild ISR when switching, so UE also need initiate TAU and rebulids ISR under idle condition after switching; In addition, if inactive I SR under two kinds of coverings of UE before and after switching and does not also carry out any processing to ISR in the handoff procedure, switch finish after UE also need under idle condition, initiate TAU and rebulid ISR; Thereby increased the signalling interactive process of UE and network, increased the burden of UE, wasted Internet resources simultaneously.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of changing method of cross wireless access technology is provided, by this method to ISR function activation or maintenance.

In order to address the above problem, the invention provides a kind of changing method of cross wireless access technology, when UE when the source Radio Access Network switches to target radio access network, this method comprises the steps:

After the source mobile management unit of described source Radio Access Network receives handoff request, transmit re-positioning request to the target mobile management unit transmission of described target radio access network; Comprise the indication that this source mobile management unit has the ISR ability in this request;

If described target mobile management unit has the ISR ability and judgement need not to reselect S-GW for this UE, then activate or keep the ISR function of this UE, and in the forwarding relocation response of correspondence, comprise the mark that activates the ISR function;

After receiving above-mentioned forwarding relocation response, described source mobile management unit activates or keeps the ISR function of this UE;

Above-mentioned Radio Access Network is: UTRAN or E-UTRAN; Above-mentioned source mobile management unit and target mobile management unit are respectively source SGSN and purpose MME, or source MME and purpose SGSN.

In addition, described target mobile management unit is receiving described forwarding re-positioning request, and after activating the ISR function of described UE, creates the ISR function that carrying request notice S-GW has activated described UE by sending.

In addition, described target mobile management unit sends described establishment carrying request before finishing message receiving reorientation; And send relevant more new bearer request to described S-GW after finishing message receiving described reorientation.

In addition, described UE finish be linked into described target radio access network after, further comprising the steps of:

Described target mobile management unit is after Routing Area Update request that receives described UE or tracing section updating request, by sending two login states that position updating request notice HSS safeguards described source mobile management unit and target mobile management unit.

In addition, described HSS is after receiving described position updating request, and the mobile management unit that is carrying out belonging to before the described switching to UE described in the described target radio access network sends the canceling position request.

Described target mobile management unit is accepted message or tracing section updating and is accepted the described UE of message informing and activated the ISR function by sending corresponding Routing Area Update after Routing Area Update request that receives described UE or tracing section updating request.

In addition, described target mobile management unit is judged and is write down described UE and whether activated the ISR function before carrying out described switching in described target mobile management unit after receiving described forwarding re-positioning request; If then keep the ISR function of described UE, otherwise activate the ISR function of described UE.

The method of in the switching flow of the technology that spans into when S-GW does not change that the present invention proposes the ISR state being handled, the improvement by to existing switching flow activates or has kept the ISR state.Avoid UE to set up by new flow process or reconstruction ISR, thereby reduced the burden of UE, saved Internet resources.

Description of drawings

Fig. 1 is evolution packet network of the prior art (EPS) system construction drawing;

Fig. 2 moves to the switching flow that the area of coverage caused of UTRAN from the E-UTRAN area of coverage for the UE of connection status;

Fig. 3 is first embodiment of the invention activates ISR the handoff procedure from the E-UTRAN network to the UTRAN network that UE initiates a method flow diagram;

Fig. 4 is second embodiment of the invention activates ISR the handoff procedure from the UTRAN network to the E-UTRAN network that UE initiates a method flow diagram;

Fig. 5 is third embodiment of the invention activates ISR the handoff procedure from the E-UTRAN network to the UTRAN network that UE initiates a method flow diagram;

Fig. 6 is fourth embodiment of the invention activates ISR the handoff procedure from the UTRAN network to the E-UTRAN network that UE initiates a method flow diagram;

Fig. 7 is a kind of method flow diagram of keeping ISR the handoff procedure of the UE that activates ISR from the E-UTRAN network to the UTRAN network of the present invention.

Embodiment

Describe the present invention below in conjunction with drawings and Examples.

Fig. 3 is first embodiment of the invention activates ISR the handoff procedure from the E-UTRAN network to the UTRAN network that UE initiates a method flow diagram.In the present embodiment, UE switches to a unregistered route district of UTRAN network.As shown in Figure 3, this method may further comprise the steps:

Step 301, because the power of wireless side signal, the perhaps reasons such as decision-making of source eNB, UE has initiated switching flow, and decision switches to UTRAN.

Step 302, source eNB initiates handoff request to source MME, carries in this request to cause the reason switched, the Target RNC sign, source eNB sign and the carrying that need carry out data forwarding are tabulated.

Step 303 after source MME finishes the mapping that EPS is carried to PDP Context, sends to target SGSN and to transmit re-positioning request; The IMSI that comprises UE in this request, the target SGSN sign, mobile management context and PDP Context, the tunnel end sign and the address of MME chain of command, and whether sign directly transmits the sign of data; In addition, comprise also in this request whether this MME has the indication of ISR ability.

After target SGSN receives and transmits re-positioning request, need judge and write down this UE and before switching, whether in this target SGSN, activate the ISR function.

Step 304, target SGSN sends re-positioning request to Target RNC, and request target RNC sets up radio bearer; Carry the sign of UE in this request, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 305 is returned re-positioning request to target SGSN after the Target RNC distributing radio resource and is replied; During replying, this comprises radio bearer tabulation of successfully setting up and the radio bearer tabulation of setting up failure.

Step 306, target SGSN is returned the forwarding relocation response to source MME; Comprise SGSN chain of command tunnel end sign and address in this response, radio bearer setup message, and the tunnel end sign and the address of data forwarding.

Target SGSN judges whether to reselect a S-GW, and the embodiment of the invention does not have situation about changing at S-GW, if S-GW changes, then can not activate ISR in this switching flow, and this situation is not done and given unnecessary details not in category of the present invention.If judging, target SGSN do not reselect S-GW, and source MME indicates it to have the ISR ability in the step 303, target SGSN also has the ISR ability simultaneously, and decision activates ISR, then target SGSN also is designated ISR state of activation with this UE at local activation ISR, and keeps address and the relevant information of MME; Target SGSN also comprises the ISR sign in the above-mentioned response that source MME sends, be used for notification source MMW and whether activate the ISR state.

It should be noted that because the information that writes down in the step 303 shows this UE and before switching, in target SGSN, do not activate ISR, therefore should judge the operation that activates ISR.

Step 307 if comprise ISR sign in the forwarding relocation response that source MME receives, then activates or keeps the ISR function (be the log-on message that source MME writes down this UE, and identify this UE activated ISR) of this UE; And source MME also preserves the address and the relevant information of target SGSN; Source MME sends switching command to source eNB, comprising the carrying tabulation of carrying out data forwarding.

Source MME and target SGSN are preserved address and relevant information each other, are used for follow-uply in other flow process (for example logout flow path) relevant with the UE of this activation ISR, notify the state etc. of this UE the other side this moment.

Step 308, source eNB sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 309～311, source eNB transmits the SRNS context by source MME and target SGSN to Target RNC.

After the SRNS context is received in step 312～314, Target RNC, return forwarding SRNS context by target SGSN and source MME to source eNB and reply.

Step 315, UE finishes and is linked into after the Target RNC, sends handoff completion message to Target RNC.

Step 316, Target RNC have been finished source eNB after the reorientation of Target RNC, send reorientation to target SGSN and finish message.

Step 317, target SGSN send to transmit to be redirected to source MME finishes message, and notification target SGSN switching is finished.

Step 318, source MME sends to transmit to be redirected to finish to target SGSN and replys.

Step 319, because target SGSN has activated ISR in step 306, and this UE does not activate ISR at this SGSN before switching, and therefore initiates to create the carrying request to S-GW; Carry the UE sign in this request, the tunnel end sign of the address of target SGSN and chain of command, the address of Target RNC and user's face tunnel end sign;

Above-mentioned establishment carrying request is used to allow the S-GW be new GTP-C Tunnel Identifier of GTP-C tunnel distributing new between target SGSN and the S-GW, notifies S-GW to switch simultaneously and finishes; And, should comprise also in the establishment bearing request message that ISR activates indication, this UE of notice S-GW has activated ISR.

Step 320, 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 321, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries information such as the address of P-GW and Tunnel Identifier in this message.

Step 322, S-GW returns to target SGSN and creates the carrying response, brings target SGSN with the newly assigned target GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.

Step 323, switching is finished, and the up-downgoing data transmit by the system after switching.

Step 324, UE finds to have inserted a unregistered route district by the monitoring wireless channel, therefore initiates the Routing Area Update request, request is in new route district registration, the sign of carrying UE in this request.

Step 325, target SGSN can be carried out authentication and licensing process to UE at this moment.

Step 326, target SGSN changes by this UE registered location of location update request message notice HSS; Because target SGSN has activated ISR in step 306, therefore the updating type parameter value that carries in this position updating request is two registrations, keeps PS (Packet Swithed, packet switching) the territory registration of two kinds of different access technologies for this UE with notice HSS.

Step 327, if UE has activated ISR before, then HSS has preserved the information of this UE in source MME and two PS territory registrations of source SGSN; HSS keeps a PS territory registration according to two registration policy of the updating type that carries in the position updating request to UE executing location information to every kind of access technology, therefore sends the canceling position request to source SGSN, and safeguards the registration of target SGSN and source MME;

If do not activate ISR before the UE, HSS can not preserve the positional information of any SGSN so, and step 327～330 are skipped and are not performed so.

Step 328, source SGSN is to HSS home position cancellation response.

Step 329, source SGSN receives the canceling position request that HSS sends, the context of local this UE that preserves of deletion, and, wherein carry the tunnel end sign of cause value and chain of command to the request of S-GW transmission deleting bearing.

Step 330, S-GW deletes all carryings that this chain of command tunnel is set up, and returns the deleting bearing response to source SGSN.

Step 331, HSS inserts user data to target SGSN.

Step 332, target SGSN is returned the insertion user data to HSS and is replied.

Step 333, HSS confirms the position renewal of target SGSN by send position renewal response to target SGSN.

Step 334, effective in current route district if target SGSN is confirmed UE, then send Routing Area Update and accept message to UE, carry the ISR sign in this message, be used to notify UE to activate the ISR function.

Step 335, if target SGSN is that UE has distributed a new P-TMSI by the RAU flow process, UE can return Routing Area Update and finishes message and confirm to target SGSN so.

So far, switching is finished, and is follow-up when UE moves back to E-UTRAN, owing to activated the ISR function, then need not to activate the ISR function by initiating the TAU flow process again.

Fig. 4 is second embodiment of the invention activates ISR the handoff procedure from the UTRAN network to the E-UTRAN network that UE initiates a method flow diagram.In the present embodiment, UE switches to a unregistered tracking area of E-UTRAN network.As shown in Figure 4, this method may further comprise the steps:

Step 401, because the power of wireless side signal, the perhaps reasons such as decision-making of source RN C, UE has initiated switching flow, and decision switches to E-UTRAN.

Step 402, source RNC initiates handoff request to source SGSN, carries in this request to cause the reason switched, the target eNB sign, source RNC sign and the carrying that need carry out data forwarding are tabulated.

Step 403, source SGSN finishes PDP Context after the mapping of EPS carrying, sends to target MME and transmits re-positioning request; The IMSI that comprises UE in this request, target MME sign, mobile management context and bearer context, the tunnel end sign and the address of SGSN chain of command, and whether sign directly transmits the sign of data; In addition, comprise also in this request whether this SGSN has the indication of ISR ability.

After target MME receives and transmits re-positioning request, need judge and write down this UE and before switching, whether in this target MME, activate the ISR function.

Step 404, target MME sends re-positioning request to target eNB, and request target eNB sets up radio bearer, carries the sign of UE in this request, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 405 is returned re-positioning request to target MME after the target eNB distributing radio resource and is replied; During replying, this comprises radio bearer tabulation of successfully setting up and the radio bearer tabulation of setting up failure.

Step 406, target MME returns the forwarding relocation response to source SGSN; Comprise MME chain of command tunnel end sign and address in this response, radio bearer setup message, and the tunnel end sign and the address of data forwarding.

Target MME judges whether to reselect a S-GW, and present embodiment does not have situation about changing at S-GW, if S-GW changes, then can not activate ISR in this switching flow, and this situation is not done here and given unnecessary details not in category of the present invention.If judging, target MME do not reselect a S-GW, and source SGSN indicates it to have the ISR ability in the step 403, target MME also has the ISR ability simultaneously, and decision activates ISR, then target MME also is designated ISR state of activation with this UE at local activation ISR, and keeps address and the relevant information of SGSN.Target MME also comprises the ISR sign in the above-mentioned response that source SGSN sends, be used for notification source SGSN and whether activate the ISR state.

It should be noted that because the information that writes down in the step 403 shows this UE and before switching, in target MME, do not activate ISR, therefore should judge the operation that activates ISR.

Step 407 if comprise the ISR sign in the forwarding relocation response that source SGSN receives, then activates or keeps the ISR function of this UE; And source SGSN also preserves address and the relevant information of target MME; Source SGSN sends switching command to source RNC, comprising the carrying tabulation of carrying out data forwarding.

Source SGSN and target MME preserve address and relevant information each other, are used for follow-uply in other flow process (for example logout flow path) relevant with the UE of this activation ISR, notify the state etc. of this UE the other side this moment.

Step 408, source RNC sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 409～411, source RNC transmits the SRNS context by source SGSN and target MME to target eNB.

After the SRNS context is received in step 412～414, target eNB, return forwarding SRNS context by target MME and source SGSN to source RNC and reply.

Step 415, UE finishes and is linked into after the target eNB, sends handoff completion message to target eNB.

Step 416, target eNB have been finished source RNC and have been arrived after the reorientation of target eNB, send reorientation to target MME and finish message.

Step 417, target MME sends to transmit to be redirected to source SGSN and finishes message, and notification target MME has finished switching.

Step 418, source SGSN transmits to be redirected to finish to target MME and replys.

Step 419, because target MME has activated ISR in step 406, and this UE does not activate ISR at target MME before switching.Therefore initiate to create the carrying request to S-GW; Carry the UE sign in this request, MME control plane address and tunnel end sign, the address of target eNB and user's face tunnel end sign.

Above-mentioned establishment carrying request is used to allow the S-GW be new GTP-C Tunnel Identifier of GTP-C tunnel distributing new between target MME and the S-GW, notifies S-GW to switch simultaneously and finishes.And, should comprise also in the establishment bearing request message that ISR activates indication, this UE of notice S-GW has activated ISR.

Step 420, 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 421, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries information such as the address of P-GW and Tunnel Identifier in this message.

Step 422, S-GW returns to target MME and creates the carrying response, brings target MME with the newly assigned target GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.

Step 423, switching is finished, and the up-downgoing data are transmitted by the system after switching.

Step 424, UE finds to have inserted a unregistered tracking area by the monitoring wireless channel, so the initiating updating of tracking area request, and request is in new tracking area registration, the sign of carrying UE in this request.

Step 425, target MME can carry out authentication and licensing process to UE at this moment.

Step 426, target MME changes by this UE registered location of location update request message notice HSS.Because target MME has activated ISR in step 406, therefore the updating type parameter value that carries in this position updating request is two registrations, keeps the PS territory registration of two kinds of different access technologies for this UE with notice HSS.

Step 427, if UE has activated ISR before, then HSS has preserved the information of this UE in two PS territory registrations of source MME and source SGSN.HSS keeps a PS territory registration according to two registration policy of the updating type that carries in the position updating request to UE executing location information to every kind of access technology, therefore sends the canceling position request to source MME, and safeguards the registration of target MME and source SGSN;

If do not activate ISR before the UE, HSS can not preserve the positional information of any MME so, and step 427～430 are skipped and are not performed so.

Step 428, source MME is to HSS home position cancellation response.

Step 429, source MME receives the canceling position request that HSS sends, the context of local this UE that preserves of deletion, and, wherein carry the tunnel end sign of cause value and chain of command to the request of S-GW transmission deleting bearing.

Step 430, S-GW deletes all carryings that this chain of command tunnel is set up, and returns the deleting bearing response to source MME.

Step 431, HSS inserts user data to target MME.

Step 432, target MME returns the insertion user data to HSS and replys.

Step 433, HSS confirms the position renewal of target MME by send position renewal response to target MME.

Step 434, effective in current tracking area if target MME confirms UE, then send tracing section updating and accept message to UE, carry the ISR sign in this message, be used to notify UE to activate the ISR function.

Step 435, if target MME is that UE has distributed a new GUTI (global unique temporary identity) by the TAU flow process, so UE can returning tracking the district upgrade and finish message and confirm to MME.

So far, switching is finished, and is follow-up when UE moves back to UTRAN, owing to activated the ISR function, need not to activate ISR by initiating the RAU flow process again.

Fig. 5 is third embodiment of the invention activates ISR the handoff procedure from the E-UTRAN network to the UTRAN network that UE initiates a method flow diagram.In the present embodiment, UE switches to a unregistered route district of UTRAN network.As shown in Figure 5, this method may further comprise the steps:

Step 501, because the power of wireless side signal, the perhaps reasons such as decision-making of source eNB, UE has initiated switching flow, and decision switches to UTRAN.

Step 502, source eNB initiates handoff request to source MME, carries in this request to cause the reason switched, the Target RNC sign, source eNB sign and the carrying that need carry out data forwarding are tabulated.

Step 503, after source MME finishes the mapping that EPS is carried to PDP Context, send the forwarding re-positioning request to target SGSN, the IMSI that comprises UE in this request, the target SGSN sign, mobile management context and PDP Context, the tunnel end sign and the address of MME chain of command, and whether sign directly transmits the sign of data; In addition, comprise also in this request whether this MME has the indication of ISR ability.

Step 504, target SGSN judge whether to reselect a S-GW, and the embodiment of the invention does not have situation about changing at S-GW, if S-GW changes, then can not activate ISR in this switching flow, and this situation is not done and given unnecessary details not in category of the present invention; If judging, target SGSN do not reselect S-GW, and source MME indicates it to have the ISR ability in the step 503, target SGSN also has the ISR ability simultaneously, and decision activates ISR, then target SGSN also is designated ISR state of activation with this UE at local activation ISR, and keeps address and the relevant information of source MME.

In addition, activated ISR, and UE does not activate ISR in target SGSN before switching flow, therefore initiate to create the carrying request to S-GW because target SGSN is judged; Carry the UE sign in this request, the tunnel end sign of SGSN chain of command.This request is used to allow the S-GW be new GTP-C Tunnel Identifier of GTP-C tunnel distributing new between target SGSN and the S-GW.And, should comprise also in the establishment bearing request message that ISR activates indication, this UE of notice S-GW has activated ISR.

Step 505, S-GW returns to target SGSN and creates the carrying response, brings target SGSN with the newly assigned target GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.

Step 506, target SGSN sends re-positioning request to Target RNC, and request target RNC sets up radio bearer; Carry the sign of UE in this request, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 507 is returned re-positioning request to target SGSN after the Target RNC distributing radio resource and is replied; During replying, this comprises radio bearer tabulation of successfully setting up and the radio bearer tabulation of setting up failure.

Step 508, target SGSN is returned the forwarding relocation response to source MME; Comprise SGSN chain of command tunnel end sign and address in this response, radio bearer setup message, the tunnel end sign and the address of data forwarding, and ISR sign are used for notification source MME and whether activate the ISR state.

Step 509 if comprise the ISR sign in the forwarding relocation response that source MME receives, then activates or keeps the ISR function of this UE; And source MME also preserves the address and the relevant information of target SGSN; Source MME sends switching command to source eNB, comprising the carrying tabulation of carrying out data forwarding.

Step 510, source eNB sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 511～513, source eNB transmits the SRNS context by source MME and target SGSN to Target RNC.

After the SRNS context is received in step 514～516, Target RNC, return forwarding SRNS context by target SGSN and source MME to source eNB and reply.

Step 517, UE finishes and is linked into after the Target RNC, sends handoff completion message to Target RNC.

Step 518, Target RNC have been finished source eNB after the reorientation of Target RNC, send reorientation to target SGSN and finish message.

Step 519, target SGSN send to transmit to be redirected to source MME finishes message, and notification target SGSN switching is finished.

Step 520, source MME sends to transmit to be redirected to finish to target SGSN and replys.

Step 521, target SGSN are to the request of S-GW starting update load bearing, and notice S-GW switching is finished.Carry source GTP-C Tunnel Identifier and target GTP-C Tunnel Identifier in this request message, the user's face tunnel end sign and the address of Target RNC, S-GW is the binding relationship of new bearer more.

Step 522, 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 523, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries the address of P-GW and Tunnel Identifier etc. in this message.

Step 524, S-GW returns more the new bearer response to target SGSN, and the address of the target GTP-C Tunnel Identifier of S-GW and address and P-GW and tunnel information etc. are returned to target SGSN.

Step 525, switching is finished, and the up-downgoing data are transmitted by the system after switching.

Step 526, UE finds to have inserted a unregistered route district by the monitoring wireless channel, therefore initiates the Routing Area Update request, request is in new route district registration, the sign of carrying UE in this request.

Step 527, target SGSN can be carried out authentication and licensing process to UE at this moment.

Step 528, target SGSN changes by this UE registered location of location update request message notice HSS; Because target SGSN has activated ISR in step 504, therefore the updating type parameter value that carries in this position updating request is two registrations, keeps the PS territory registration of two kinds of different access technologies for this UE with notice HSS.

Step 529, if UE has activated ISR before, then HSS has preserved the information of this UE in two PS territory registrations of source MME and source SGSN; HSS keeps a PS territory registration according to two registration policy of the updating type that carries in the position updating request to UE executing location information to every kind of access technology, therefore sends the canceling position request to source SGSN, and safeguards the registration of target SGSN and source MME;

If do not activate ISR before the UE, HSS can not preserve the positional information of any SGSN so, and step 529～532 are skipped and are not performed so.

Step 530, source SGSN is to HSS home position cancellation response.

Step 531, source SGSN receives the canceling position request that HSS sends, the context of local this UE that preserves of deletion, and, wherein carry the tunnel end sign of cause value and chain of command to the request of S-GW transmission deleting bearing.

Step 532, S-GW deletes all carryings that this chain of command tunnel is set up, and returns the deleting bearing response to source SGSN.

Step 533, HSS inserts user data to target SGSN.

Step 534, target SGSN is returned the insertion user data to HSS and is replied.

Step 535, HSS confirms the position renewal of target SGSN by send position renewal response to target SGSN.

Step 536, effective in current route district if target SGSN is confirmed UE, then send Routing Area Update and accept message to UE, carry the ISR sign in this message, be used to notify UE to activate the ISR function.

Step 537, if target SGSN is that UE has distributed a new P-TMSI by the RAU flow process, UE can return Routing Area Update and finishes message and confirm to target SGSN so.

So far, switching is finished, and is follow-up when UE moves back to E-UTRAN, owing to activated the ISR function, need not to activate ISR by initiating the TAU flow process again.

Fig. 6 is fourth embodiment of the invention activates ISR the handoff procedure from the UTRAN network to the E-UTRAN network that UE initiates a method flow diagram.In the present embodiment, UE switches to a unregistered tracking area of E-UTRAN network.As shown in Figure 6, this method may further comprise the steps:

Step 601, because the power of wireless side signal, the perhaps reasons such as decision-making of source RNC, UE has initiated switching flow, and decision switches to E-UTRAN.

Step 602, source RNC initiates handoff request to source SGSN, carries in this request to cause the reason switched, the target eNB sign, source RNC sign and the carrying that need carry out data forwarding are tabulated.

Step 603, source SGSN finishes PDP Context after the mapping of EPS carrying, sends to target MME and transmits re-positioning request; The IMSI that comprises UE in this request, target MME sign, mobile management context and bearer context, the tunnel end sign and the address of SGSN chain of command, and whether sign directly transmits the sign of data; In addition, comprise also in this request whether this SGSN has the indication of ISR ability.

Step 604, target MME judges whether to reselect a S-GW, and the embodiment of the invention does not have situation about changing at S-GW, if S-GW changes, then can not activate ISR in this switching flow, and this situation is not done and is given unnecessary details not in category of the present invention.If judging, target MME do not reselect S-GW, and source SGSN indicates it to have the ISR ability in the step 603, target MME also has the ISR ability simultaneously, and decision activates ISR, then target MME also is designated ISR state of activation with this UE at local activation ISR, and keeps address and the relevant information of source SGSN.

In addition, activated ISR, and UE does not activate ISR at target MME before switching flow, therefore initiate to create the carrying request to S-GW because target MME judges; Carry the UE sign in this request, the tunnel end sign of MME chain of command.This request is used to allow the S-GW be new GTP-C Tunnel Identifier of GTP-C tunnel distributing new between target MME and the S-GW.And, should comprise also in the establishment bearing request message that ISR activates indication, this UE of notice S-GW has activated ISR.

Step 605, S-GW returns to target MME and creates the carrying response, brings target MME with the newly assigned target GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.

Step 606, target MME sends re-positioning request to target eNB, and request target eNB sets up radio bearer, carries the sign of UE in this request, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 607 is returned re-positioning request to target MME after the target eNB distributing radio resource and is replied; During replying, this comprises radio bearer tabulation of successfully setting up and the radio bearer tabulation of setting up failure.

Step 608, target MME returns the forwarding relocation response to source SGSN; Comprise MME chain of command tunnel end sign and address in this response, radio bearer setup message, the tunnel end sign and the address of data forwarding, and ISR sign are used for notification source SGSN and whether activate the ISR state.

Step 609 if comprise the ISR sign in the forwarding relocation response that source SGSN receives, then activates or keeps the ISR function of this UE; And source SGSN also preserves address and the relevant information of target MME; Source SGSN sends switching command to source RNC, comprising the carrying tabulation of carrying out data forwarding.

Step 610, source RNC sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 611～613, source RNC transmits the SRNS context by source SGSN and target MME to target eNB.

After the SRNS context is received in step 614～616, target eNB, return forwarding SRNS context by target MME and source SGSN to source RNC and reply.

Step 617, UE finishes and is linked into after the target eNB, sends handoff completion message to target eNB.

Step 618, target eNB have been finished source RNC and have been arrived after the reorientation of target eNB, send reorientation to target MME and finish message.

Step 619, target MME sends to transmit to be redirected to source SGSN and finishes message, and notification target MME has finished switching.

Step 620, source SGSN transmits to be redirected to finish to target MME and replys.

Step 621, target MME is to the request of S-GW starting update load bearing, and notice S-GW switching is finished.Carry source GTP-C Tunnel Identifier and target GTP-C Tunnel Identifier in the request message, the user's face tunnel end sign and the address of target eNB, S-GW is the binding relationship of new bearer more.

Step 622, 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 623, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries the address of P-GW and Tunnel Identifier etc. in this message.

Step 624, S-GW returns more the new bearer response to target MME, and the address of the target GTP-C Tunnel Identifier of S-GW and address and P-GW and tunnel information etc. are returned to target MME.

Step 625, switching is finished, and the up-downgoing data are transmitted by the system after switching.

Step 626, UE finds to have inserted a unregistered tracking area by the monitoring wireless channel, so the initiating updating of tracking area request, and request is in new tracking area registration, the sign of carrying UE in this request.

Step 627, target MME can carry out authentication and licensing process to UE at this moment.

Step 628, target MME changes by this UE registered location of location update request message notice HSS.Because target MME has activated ISR in step 608, therefore the updating type parameter value that carries in this position updating request is two registrations, keeps the PS territory registration of two kinds of different access technologies for this UE with notice HSS.

Step 629, if UE has activated ISR before, then HSS has preserved the information of this UE in two PS territory registrations of source MME and source SGSN.HSS keeps a PS territory registration according to two registration policy of the updating type that carries in the position updating request to UE executing location information to every kind of access technology, therefore sends the canceling position request to source MME, and safeguards the registration of target MME and source SGSN;

If do not activate ISR before the UE, HSS can not preserve the positional information of any MME so, and step 629～632 are skipped and are not performed so.

Step 630, source MME is to HSS home position cancellation response.

Step 631, source MME receives the canceling position request that HSS sends, the context of local this UE that preserves of deletion, and, wherein carry the tunnel end sign of cause value and chain of command to the request of S-GW transmission deleting bearing.

Step 632, S-GW deletes all carryings that this chain of command tunnel is set up, and returns the deleting bearing response to source MME.

Step 633, HSS inserts user data to target MME.

Step 634, target MME returns the insertion user data to HSS and replys.

Step 635, HSS confirms the position renewal of target MME by send position renewal response to target MME.

Step 636, effective in current tracking area if target MME confirms UE, then send tracing section updating and accept message to UE, carry the ISR sign in this message, be used to notify UE to activate the ISR function.

Step 637, if target 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.

Fig. 7 is a kind of method flow diagram of keeping ISR the handoff procedure of the UE that activates ISR from the E-UTRAN network to the UTRAN network of the present invention.In the present embodiment, UE switches (a registered route district that promptly switches to the UTRAN network) in activating two overlay areas of ISR.As shown in Figure 7, this method comprises the steps:

Step 701, because the power of wireless side signal, the perhaps reasons such as decision-making of source eNB, UE has initiated switching flow, and decision switches to UTRAN.

Step 702, source eNB initiates handoff request to source MME, carries in this request to cause the reason switched, the Target RNC sign, source eNB sign and the carrying that need carry out data forwarding are tabulated.

Step 703 after source MME finishes the mapping that EPS is carried to PDP Context, sends to target SGSN and to transmit re-positioning request; The IMSI that comprises UE in this request, the target SGSN sign, mobile management context and PDP Context, the tunnel end sign and the address of MME chain of command, and whether sign directly transmits the sign of data; In addition, comprise also in this request whether this MME has the indication of ISR ability.

Step 704, target SGSN sends re-positioning request to Target RNC, and request target RNC sets up radio bearer; Carry the sign of UE in this request, the cause value of reorientation, the needed relevant information of authentication and integrity protection needs the radio bearer tabulation of setting up.

Step 705 is returned re-positioning request to target SGSN after the Target RNC distributing radio resource and is replied; During replying, this comprises radio bearer tabulation of successfully setting up and the radio bearer tabulation of setting up failure.

Step 706, target SGSN is returned the forwarding relocation response to source MME; Comprise SGSN chain of command tunnel end sign and address in this response, radio bearer setup message, and the tunnel end sign and the address of data forwarding.

Target SGSN judges whether to reselect a S-GW, and the embodiment of the invention does not have situation about changing at S-GW, if S-GW changes, then can not keep ISR in this switching flow, and whether this situation or not in category of the present invention, do not done and given unnecessary details.If judging, target SGSN do not reselect S-GW, and source MME indicates it to have the ISR ability in the step 703, target SGSN also has the ISR ability simultaneously, and decision keeps ISR, then target SGSN keeps ISR and continues UE is designated ISR state of activation in this locality, and keeps address and the relevant information of MME.Target SGSN also comprises the ISR sign in the above-mentioned response that source MME sends, be used for notification source MME and whether keep the ISR state.

It should be noted that because the information that writes down in the step 703 shows that this UE has activated ISR before switching in target SGSN, therefore should judge the operation that keeps ISR.

Step 707 if comprise the ISR sign in the forwarding relocation response that source MME receives, then keeps the ISR state of activation; And source MME also preserves the address and the relevant information of target SGSN; Source MME sends switching command to source eNB, comprising the carrying tabulation of carrying out data forwarding.

Step 708, source eNB sends switching command to UE and notifies UE to carry out switching, and the UE acquisition needs the beared information of switching, and stops at upward transmission upstream data of these carryings.

Step 709～711, source eNB transmits the SRNS context by source MME and target SGSN to Target RNC.

After the SRNS context is received in step 712～714, Target RNC, return forwarding SRNS context by target SGSN and source MME to source eNB and reply.

Step 715, UE finishes and is linked into after the Target RNC, sends handoff completion message to Target RNC.

Step 716, Target RNC have been finished source eNB after the reorientation of Target RNC, send reorientation to target SGSN and finish message.

Step 717, target SGSN send to transmit to be redirected to source MME finishes message, and notification target SGSN switching is finished.

Step 718, source MME sends to transmit to be redirected to finish to target SGSN and replys.

Step 719 just activated ISR if target SGSN is judged before switching, and (step 706) has kept the ISR state of activation in handoff procedure, then to the request of S-GW starting update load bearing; Carry source GTP-C Tunnel Identifier and target GTP-C Tunnel Identifier in the request message, the user's face tunnel end sign and the address of Target RNC, S-GW is the binding relationship of new bearer more.

Step 720, 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 721, P-GW upgrades the context of oneself and returns the renewal bearing response message to S-GW, carries information such as the address of P-GW and Tunnel Identifier in this message.

Step 722, S-GW returns more the new bearer response to target SGSN, brings target SGSN with the newly assigned target GTP-C Tunnel Identifier of S-GW, self address and the address of P-GW and tunnel information etc.

Step 723, switching is finished, and the up-downgoing data are transmitted by the system after switching.

So far switch and finish, because therefore UE can initiatively not initiate the Routing Area Update request in the registration of current route district.

For the UE that activates ISR in activating two overlay areas of ISR, switching flow and above-mentioned execution mode from the UTRAN network to the E-UTRAN network are similar, just the transmission of the decision logic of target network element and the different execution of source network element and message is similar, repeats no more here.

Claims

1. the changing method of a cross wireless access technology is characterized in that, when UE when the source Radio Access Network switches to target radio access network, this method comprises the steps:

After the source mobile management unit of described source Radio Access Network receives handoff request, transmit re-positioning request to the target mobile management unit transmission of described target radio access network; Comprise this source mobile management unit in this request and have the indication that the idle pulley signaling reduces (ISR) ability;

The idle pulley signaling reduces (ISR) ability and judgement need not to reselect gateway (S-GW) for this UE if described target mobile management unit has, then activate or keep idle pulley signaling minimizing (ISR) function of this UE, and in the forwarding relocation response of correspondence, comprise the mark that activates idle pulley signaling minimizing (ISR) function;

After receiving above-mentioned forwarding relocation response, described source mobile management unit activates or keeps the idle pulley signaling of this UE to reduce (ISR) function;

2. the method for claim 1 is characterized in that,

Described target mobile management unit is receiving described forwarding re-positioning request, and after activating idle pulley signaling minimizing (ISR) function of described UE, create idle pulley signaling minimizing (ISR) function that carrying request notification service gateway (S-GW) has activated described UE by sending.

3. method as claimed in claim 2 is characterized in that,

Described target mobile management unit sends described establishment carrying request before finishing message receiving reorientation; And send relevant more new bearer request to described gateway (S-GW) after finishing message receiving described reorientation.

4. the method for claim 1 is characterized in that,

Described UE finish be linked into described target radio access network after, further comprising the steps of:

Described target mobile management unit is safeguarded two login states of described source mobile management unit and target mobile management unit by sending position updating request notifying home user data server (HSS) after Routing Area Update request that receives described UE or tracing section updating request.

5. method as claimed in claim 4 is characterized in that,

Described home subscriber data server (HSS) is after receiving described position updating request, and the mobile management unit that is carrying out belonging to before the described switching to UE described in the described target radio access network sends the canceling position request.

6. the method for claim 1 is characterized in that,

Described target mobile management unit is accepted message or tracing section updating and is accepted the described UE of message informing and activated the idle pulley signaling and reduce (ISR) function by sending corresponding Routing Area Update after Routing Area Update request that receives described UE or tracing section updating request.

7. the method for claim 1 is characterized in that,

Described target mobile management unit is judged and is write down described UE and whether activated the idle pulley signaling reduce (ISR) function before carrying out described switching in described target mobile management unit after receiving described forwarding re-positioning request; If then keep the idle pulley signaling of described UE to reduce (ISR) function, otherwise activate idle pulley signaling minimizing (ISR) function of described UE.