CN101646256B

CN101646256B - Method, equipment and network system for switching voice in cross wireless access technology

Info

Publication number: CN101646256B
Application number: CN2009101702091A
Authority: CN
Inventors: 顾炯炯; 聂鑫
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-09-04
Filing date: 2009-09-04
Publication date: 2012-06-27
Anticipated expiration: 2029-09-04
Also published as: CN101646256A; WO2011026438A1

Abstract

The embodiment of the invention provides a method, equipment and a network system for switching voice in cross wireless access technology, and the method for switching voice in the cross wireless access technology comprises the following steps: receiving information for instructing to increase ports by a media anchor point in an IMS network while the information for instructing to increase ports is used for instructing the media anchor point to increase ports which are used for communicating with the access network of the target side circuit; distributing a third port as a port for communicating with the access network of the target side circuit; receiving downlink media stream from a second UE through a second port; sending the downlink media stream to a source side IP access network through a first port and sending the downlink media stream to the target side circuit access network through the third port; and receiving information which instructs the unavailability of the first port by the media anchor point and controlling not to send the downlink media stream from the second UE to the source side IP access network. The technical scheme of the embodiment of the invention can reduce interrupted time of conversation caused by switch, and can improve experience for users.

Description

The method for switching languages of cross wireless access technology, equipment and network system

Technical field

The embodiment of the invention relates to communication technical field, particularly a kind of method for switching languages of cross wireless access technology, equipment and network system.

Background technology

To the various network carrying mechanism, can the audio call of mobile communication be divided into following two types: the first kind is circuit (Circuit Service, CS) session service of territory carrying; Second type is divide into groups (PacketService, PS) session service of territory carrying.The 3GPP normal structure has defined the single wireless continuous voice call, and (Single Radio Voice Call Continuity, SRVCC) flow process realize the switching of speech business from the PS territory to the CS territory.The SRVCC flow process comprises Inter-RAT handover (switching of cross wireless access technology) flow process and IMS session transfer (IP Multimedia System session switching) flow process.

Prior art can be carried out Inter-RAT handover earlier and carry out IMS session transfer again when realizing the switching of speech business from the PS territory to the CS territory, perhaps, carries out IMS sessiontransfer earlier and carries out Inter-RAT handover again.But no matter be to carry out Inter-RAT handover earlier to carry out IMS session transfer again; Still carry out IMS session transfer earlier and carry out Inter-RAThandover again; The interruption time delay that all causes speech business is the interruption time delay of the medium face that causes of Inter-RAT handover and the interruption time delay sum of the medium face that IMS session transfer causes, makes the user experience variation.

Summary of the invention

The embodiment of the invention provides a kind of method for switching languages, equipment and network system of cross wireless access technology, reduces the time of the conversation that is caused by switching, improves user experience.

In view of this, the embodiment of the invention provides:

A kind of method for switching languages of cross wireless access technology comprises:

Media anchor point in the IP Multimedia System IMS network receives the message that indication increases port, and the message that said indication increases port is used to indicate said media anchor point to increase the port of communicating by letter with target side circuit access network;

According to the message of said indication increase port, the port that distributes the 3rd port conduct to communicate by letter with target side circuit access network;

Receive downlink media stream through second port, said downlink media stream is sent to source IP access network through first port, and send to said target side circuit access network through said the 3rd port from the 2nd UE;

Media anchor point receives the disabled message of indication first port, and control is not sent the downlink media stream from the 2nd UE to said source IP access network.

A kind of media anchor point comprises:

The message sink unit is used to receive the message that indication increases port, and the message that said indication increases port is used to indicate said media anchor point to increase the port of communicating by letter with target side circuit access network; Receive the disabled message of indication first port;

The port assignment unit is used for the message according to said indication increase port, the port that distributes the 3rd port conduct to communicate by letter with target side circuit access network;

The Media Stream receiving element is used for receiving the downlink media stream from the 2nd UE through second port;

The first Media Stream transmitting element is used for said downlink media stream is sent to source IP access network through first port;

The second Media Stream transmitting element is used for said downlink media stream is sent to target side circuit access network through said the 3rd port;

Control unit is used for after receiving the disabled message of said indication first port, and control is not sent the downlink media stream from the 2nd UE to said source IP access network.

A kind of network system comprises: media anchor point control network element, media anchor point and SCC AS, wherein,

Said SCC AS; Be used for when a UE carries out the SRVCC switching; The request message of a UE at the first renewal conversation media information of the SDP of target side circuit access network carried in transmission; After a UE has switched in the target side circuit access network, do not carry the request message of a UE at the second renewal conversation media information of the SDP of source IP access network to the transmission of media anchor point control network element;

Said media anchor point control network element; Be used to receive the request message of the first renewal media information; From the request message of the first renewal media information, extract a UE and join in the message of indication increase port, send the message that said indication increases port to media anchor point at the SDP of target side circuit access network; After receiving the request message of the second renewal media information, judge that not carrying a UE in the request message that obtains the second renewal media information sends the disabled message of indication first port to media anchor point behind the SDP of source IP access network;

Said media anchor point is used to receive the message that indication increases port, increases the port that distribution of messages the 3rd port conduct of port is communicated by letter with target side circuit access network according to said indication; Receive downlink media stream through second port, said downlink media stream is sent to source IP access network through first port, and send to target side circuit access network through the 3rd port from the 2nd UE; After receiving the disabled message of indication first port, control is not sent the downlink media stream from the 2nd UE to source IP access network.

Media anchor point carries out will sending to source IP access network and target side circuit access network from the downlink media stream of the 2nd UE simultaneously in the SRVCC handoff procedure at a UE in the embodiment of the invention; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise the interruption time delay that IMS Session transfer causes, improve user experience.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention one;

Fig. 2 A be a UE that the embodiment of the invention one provides carry out SRVCC switch before media flow transmission situation sketch map between a UE and the 2nd UE;

Fig. 2 B is that a UE that the embodiment of the invention one provides carries out SRVCC media flow transmission situation sketch map between a UE and the 2nd UE when switching;

Fig. 2 C be a UE that the embodiment of the invention one provides carry out SRVCC switch after media flow transmission situation sketch map between a UE and the 2nd UE;

Fig. 3 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention two;

Fig. 4 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention three;

Fig. 5 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention four;

Fig. 6 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention five;

Fig. 7 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention six;

Fig. 8 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention seven;

Fig. 9 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention eight;

Figure 10 is the method for switching languages flow chart of the cross wireless access technology that provides of the embodiment of the invention nine;

Figure 11 is that the SCC AS that the embodiment of the invention provides knows whether media anchor point control network element supports the sketch map of SRVCC performance optimization.

Figure 12 is the media anchor point structure chart that the embodiment of the invention ten provides.

Embodiment

Embodiment one:

Consult Fig. 1, the embodiment of the invention one provides a kind of method for switching languages of cross wireless access technology, and this method comprises:

101, the media anchor point in the IP Multimedia System IMS network receives the message that indication increases port, and the message that said indication increases port is used to indicate said media anchor point to increase the port of communicating by letter with target side circuit access network.

Wherein, the indication that media anchor point receiving media anchor point control network element sends increases the message of port, and media anchor point control network element sends the message that this indication increases port to media anchor point under the control of SCC AS.Wherein, Media anchor point control network element can be Proxy Call Session Control Function (Proxy-CSCF, P-CSCF) or interconnection boundary Control function (Interconnection Border Control Function, IBCF); This moment, media anchor point was border conversation controller (Session Border Controller; SBC), perhaps media anchor point control network element is MGCF, and this moment, media anchor point was the MGW of MGCF control.

102, increase the message of port according to said indication, the port that distributes the 3rd port conduct to communicate by letter with target side circuit access network.

Concrete; Media anchor point increases the message of port according to indication; The port that distributes the 3rd port (T3) conduct to communicate by letter with target side circuit access network, the direction that Media Stream between second port (T2) and the 3rd port (T3) is set is an one-way transmission, its media flow transmission direction is from the MGW of the 2nd UE to SRVCC IWF control; The direction that perhaps, Media Stream between second port (T2) and the 3rd port (T3) can be set is a transmitted in both directions.

103, receive downlink media stream through second port, said downlink media stream is sent to source IP access network through first port, and send to said target side circuit access network through said the 3rd port from the 2nd UE.

104, media anchor point receives the disabled message of indication first port, and control is not sent the downlink media stream from the 2nd UE to said source IP access network.

The disabled message of indication first port can be the message of indication deletion first port in this step; Control specifically can not be the information of deletion first port from the conversation context of a UE and the 2nd UE to the downlink media stream that source IP access network sends from the 2nd UE.

Wherein, source IP access network can comprise E-UTRAN network, MME, S-GW and PDNGW; Perhaps source IP access network can comprise PS territory, SGSN and the GGSN of UTRAN/GERAN network.Target side circuit access network comprises: and CS territory, MSC and the base station sub-system of UTRAN/GERAN network (Base Station Subsystem, BSS) or RNS.

Wherein, Media anchor point is the message that receives indication deletion first port from media anchor point control network element; Media anchor point control network element is under the control of SCC AS, to send the message that first port is deleted in indication to media anchor point; SCC AS is after receiving that a UE that SRVCC IWF sends accomplishes the notification message that Inter-RAT switches; Perhaps receive to be after indication that the P-CSCF of UE service sends discharges the message of switching preceding UE session in the IMS network, receive that perhaps expression the one UE that HSS sends has accomplished the notification message that Inter-RAT switches after, control media anchor point control network element sends the message that first port is deleted in indication to media anchor point.

Media anchor point in the IMS network in the embodiment of the invention one carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network and target side circuit access network simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise the interruption time delay that IMS Session transfer causes, improve user experience.

In order to make subsequent implementation example of the present invention clearer, divide three phases to describe the handoff procedure of conversation as follows:

Before a UE carries out the SRVCC switching; At call establishment stage, be that the S-CSCF of UE service need carry out grappling to SCC AS with call, it is the P-CSCF of the 2nd UE service that calling afterwards is routed to; P-CSCF control media anchor point by being the 2nd UE service is created context for this calling; Promptly create the conversation context of a UE and the 2nd UE, and add T1 and T2 port information in context, the media flow transmission direction that is provided with between T1 and the T2 port is a transmitted in both directions.T1 port is used for communicating by letter with source IP access network, and the T2 port is used for communicating by letter with the 2nd UE; Perhaps the 2nd UE is positioned at the CS territory, and it is the MGCF of the 2nd UE service that calling is routed to, and is that context is created in this calling by the MGCF control media anchor point that is the 2nd UE service; Perhaps the 2nd UE and a UE are positioned at different IMS territories or next generation network (Next Generation Network in the time of NGN) in the network, are this calling establishment context by the IBCF control media anchor point that is UE service.Media flow transmission situation between a UE and the 2nd UE is shown in Fig. 2 A at this moment.In actual networking; SRVCC IWF can realize that promptly SRVCC IWF and MSC server are the equipment (in-one device representes that SRVCC IWF and MSC server are positioned on the same physical entity) of unification through strengthening mobile exchange Control Server (MSC server).SRVCC IWF can also comprise the function of MGCF simultaneously; This moment SRVCCIWF; MSC server and MGCF three are positioned on the same physical entity, and the MGW of SRVCC IWF control can be positioned on the same physical entity with the MGW (being media anchor point) of MGCF like this, can reduce the time delay of medium face transmission.

After the SCC AS in the IMS network receives the IMS session transfer request that SRVCC IWF sends; Notice media anchor point control network element control media anchor point increases the T3 port and calls out in the corresponding context (i.e. the conversation context of a UE and the 2nd UE) to this; The media flow transmission direction be set between T3 and the T2 be transmitted in both directions or one-way transmission (the one-way transmission direction of Media Stream for from the direction of T2) to T3; Thereby (this moment, media access was: circuit domain (the Circuit Service of the MGW → purpose UTRAN/GERAN of the MGW of media anchor point T3 port → SRVCC IWF control → target MSC control to set up the medium face path of the target side circuit access network that media anchor point switches to SRVCC; CS)); And the downlink media stream of a near UE sends to source IP access network and target side circuit access network simultaneously, shown in Fig. 2 B.

After a UE switches to target side circuit access network; Its medium face path at target side circuit network and the 2nd UE is set up; SCC AS notice media anchor point is controlled the network element control media anchor point and is deleted the t1 port information in the conversation context of a UE and the 2nd UE at this moment; Stop to send downlink media stream to source IP access network; When if the media flow transmission direction between T2 and the T3 is one-way transmission, the media flow transmission direction that revise between T2 and the T3 port this moment is a transmitted in both directions, shown in Fig. 2 C.

Embodiment two:

Consult Fig. 3; The embodiment of the invention two provides a kind of method for switching languages of cross wireless access technology, and a UE will carry out the SRVCC switching in this method, and the 2nd UE and a UE are positioned at same IMS territory; The one UE is in E-UTRAN switches to the CS territory the UTRAN/GERAN, and this method specifically comprises:

301, at call establishment stage, be the S-CSCF of UE service according to the initial filter standard or norm of a UE (Initial Filter Criteria, iFC); Call is arrived SCC AS; And at call establishment stage, be that the S-CSCF of UE service routes the call to be the I-CSCF of the 2nd UE service, S-CSCF and P-CSCF; The P-CSCF that is the 2nd UE service sends out H.248ADD message to media anchor point; Having carried in this message increases port T1 and the indication information of port T2 and the remote descriptors (SDP of a UE in the IP access network of source) of T1, and the remote descriptors of T2 (SDP of the 2nd UE).Media anchor point is the call setup context of a UE to the two UE; The i.e. conversation context of a UE and the 2nd UE; The remote descriptors of T1 and the remote descriptors of T2 are joined in the conversation context of a UE and the 2nd UE, and the transmission direction that Media Stream between T1 and T2 is set is a transmitted in both directions.

In the embodiment of the invention and the subsequent implementation example; Media anchor point in can conversation context according to a UE and the 2nd UE between set first port and second port transmission direction of Media Stream and a UE will send to source IP access network through first port from the downlink media stream of the 2nd UE at the SDP of source IP access network.

302, a UE sends measurement report to E-UTRAN.

303, E-UTRAN confirms a UE is switched to the CS territory according to measurement report, sends handoff request (Handover Required) to MME.

304, MME carries separation (Bearer Splitting), sends forward direction re-positioning request (Forward Reloc Req) to SRVCC IWF.

Concrete, the carrying separation is that the PS carrying of voice-bearer is come out with the PS bearing identification that carries non-voice, this is for after the SRVCC switching is complete, will comprise the PS carrying release of voice composition.

305, SRVCC IWF send to prepare handoff request (Prepare HO Req) to MSC, and it is ready to be with request MSC that the conversation of a UE switches to the CS territory.

306, MSC is to RNS or base station sub-system (Base Station Subsystem; BSS) send handoff request (Handover Req); It is ready to be with request RNS or BSS that the conversation of a UE switches to the CS territory, and MSC receives the handoff response (Handover Ack) that RNS or BSS send.Be example with RNS among the figure.

307, MSC sends to SRVCC IWF and prepares handoff response (Prepare Handover Resp) message.

308, set up carrying between SRVCC IWF and the MSC.

309, a UE initiates to send session transfer request message to SCCAS.

310, SCC AS returns the affirmation message to session transfer request to SRVCC IWF.

311, SRVCC IWF sends forward direction relocation response message (Forward RelocResp) to MME, starts the Inter-RAT Handover process of a UE.

Do like this and can avoid beginning after switching in Inter-RAT Handover owing to starting too early medium face that Inter-RAT Handover causes session transfer to cause.

312, MME sends switching command to E-UTRAN.

313, E-UTRAN sends switching command to a UE, is used to indicate a UE to switch to the CS territory of UTRAN/GERAN from E-UTRAN.

314, SCC AS sends reINVITE message to ask the more media information of new session to the 2nd UE, and this reINVITE message is the request message of the first renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

SDP Offer=the one UE is at the SDP of source IP access network, the SDP of SRVCC IWF/MGW.

Wherein, STN-SR is the Handover Number of SRVCC; SRVCC IWF/MGW representes the MGW of SRVCCIWF control, and the SDP of SRVCC IWF/MGW is the SDP of a UE at target side circuit access network; SDP Offer=the one UE is at the SDP of source IP access network, and the SDP of SRVCCIWF/MGW representes: the descriptor of the WMG that needs will be conversed is updated to the SDP of UE IP access network in the source and the SDP of the MGW that SRVCC IWF controls.

315, be after the P-CSCF of the 2nd UE service receives the reINVITE message that SCC AS sends; According to STN-SR; Judging reINVITE message is that the medium face that a SRVCC switches upgrades request; Send H.248ADD message to media anchor point, it is this SRVCC handoff request Resources allocation that this message is used to control media anchor point, and the remote descriptors of the T3 port of appointment media anchor point distribution is the SDP of SRVCCIWF/MGW.Media anchor point joins the remote descriptors of T3 in the conversation context of the one UE and the 2nd UE, and the topological relation that T1, T2 be set is { T1, T2; Isolate, promptly T1 is set, T2 does not connect, the topological relation that T2, T3 are set is { T2; T3, one-way transmission }, T2, T3 connection promptly are set; And the transmission direction of Media Stream is an one-way transmission between T2, T3, and its direction is the direction from the 2nd UE to SRVCC IWF/MGW.

316, be that the P-CSCF that the 2nd UE serves sends 200OK as replying to SCC AS, the SDP answer that carries among the 200OK is the related media information of T3.

317, SCC AS sends conversation shift to SRVCC IWF and accomplishes message (End of SessionTransfer).Conversation shift is accomplished among the SDP answer that carries in the message and is carried T3 related media information; SRVCC IWF accomplishes the SDP answer that carries in the message through message H.248 with the session migration and notifies the MGW to SRVCC IWF control, and the medium face of accomplishing from the media anchor point to MGW is consulted.

At this moment; From the MGW → MGW → RNS of MSC control of the 2nd UE → media anchor point → SRVCC IWF control or the medium face path setting of BSS, the subsequent media anchor point will send to E-UTRAN and RNS or E-UTRAN and BSS simultaneously from the downlink media stream of the 2nd UE.

Whether 318, SCC AS sends subscribe message SUBSCRIBE to SRVCC IWF, and the Inter-RAT that pulls subscription switches the completion incident, promptly ask SRVCC IWF indication Inter-RAT to switch and accomplish.

Concrete, the incident package definition is following:

Event?package?name:srvcc-status

MIME?type:application/srvcc-status+xml

XML?schema:

<?xml?version＝″1.0″encoding＝″UTF-8″?>

<xs:schema?targetNamespace＝″urn:oma:params:xml:ns:srvcc-status-request″

xmlns＝″urn:oma:params:xml:ns:srvcc-status-request″

xmlns:xs＝″http://www.w3.org/2001/XMLSchema″elementFormDefault＝″qualified″

attributeFormDefault＝″unqualified″>

<xs:element?name＝“msisdn″type＝“xs:string”/>

</xs:schema>

<?xml?version＝″1.0″encoding＝″UTF-8″?>

<xs:schema?targetNamespace＝″urn:oma:params:xml:ns:srvcc-status-response″

xmlns＝″urn:oma:params:xml:ns:srvcc-status-response″

attributeFormDefault＝″unqualified″>

<xs:element?name＝“msisdn″type＝“xs:string”/>

<xs:element?name＝“srvcc-status″>

<xs:simpleType>

<xs:restriction?base＝″xs:string″>

<xs:enumeration?value＝“complete″/>

<xs:enumeration?value＝“incomplete″/>

</xs:restriction>

</xs:simpleType>

</xs:element>

</xs:schema>

Because SCC AS sends SUBSCRIBE to SRVCC IWF; So SRVCC IWF should be arranged on the physical entity with MGCF, avoid MGCF between SRVCC IWF and SCC AS and cause SUBSCRIBE to take place by the situation that MGCF be transmitted to SRVCC IWF.

319, SRVCC IWF sends 200OK as replying to SCC AS.

320, the voice call of a UE is Inter-RAT handover process from the CS territory that E-UTRAN switches to UTRAN/GERAN.

321, RNS or BSS send handoff completion message (HO Complete) to MSC, with the Inter-RAT Handover completion of notice MSC the one UE.

322, (send end signal SES), accomplishes with the Inter-RAT Handover that notifies MSC the one UE MSC to SRVCC IWF transmission end signal.

323, SRVCC IWF sends forward location to MME and accomplishes message (Forward RelocComplete/ACK).

324, after SRVCC IWF receives end signal, send a notification message (Notify) to SCC AS, the Inter-RAT Handover of notice SCC AS the one UE accomplishes, and SCC AS sends 200OK as replying to SRVCC IWF.

325, after the notified message of SCCAS (Notify), send reINVITE message, ask the more media information of new session to the 2nd UE.Wherein, this reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

SDP?Offer＝SRVCC?IWF/MGW?SDP

326, P-CSCF receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point; This message is used to control media anchor point deletion t1 port, and the transmission direction with the Media Stream between T2, T3 simultaneously changes transmitted in both directions into.Media anchor point receives this H.248SUB after the message, the information of deletion t1 port in the conversation context of a UE and the 2nd UE, and the transmission direction that the Media Stream between T2, T3 is set changes transmitted in both directions into.

Media anchor point in the IMS network in the embodiment of the invention two carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (comprising E-TURAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby the interruption time delay that SRVCC is switched does not comprise that IMS Session transfer causes interruption time delay, improves user experience.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology; The difference of this method and the foregoing description two is: the 2nd UE is positioned at the CS territory; In step 315, be to be the MGCF reception reINVITE message of the 2nd UE service, send H.248ADD message to media anchor point; Be to send 200OK as replying to SCC AS in the step 316, carry SDPanswer among the 200OK by MGCF; Be to receive reINVITE message in the step 326 by MGCF; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point, this message is used to control media anchor point deletion T1, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.Other steps and embodiment two are similar, repeat no more.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology; This method is with the difference of the foregoing description two: the 2nd UE is arranged in the IMS territory different with a UE; In step 315; Be to be the IBCF reception reINVITE message of the 2nd UE service, send H.248ADD message to media anchor point; Be to send 200OK as replying to SCC AS in the step 316, carry SDP answer among the 200OK by IBCF; Be to receive reINVITE message in the step 326 by IBCF; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point, this message is used to control media anchor point deletion T1, changes the transmission direction between T2, T3 into transmitted in both directions simultaneously.Other steps and embodiment two are similar, repeat no more.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology, and the difference of this method and embodiment two is: SRVCC IWF and MSC are positioned on the same physical entity, are promptly carried out the function of SRVCC IWF by the MSC of increased functionality type.

Among above-mentioned each embodiment; Media flow transmission direction in the handoff procedure between media anchor point and the target side circuit access network is an one-way transmission; When the one UE accomplished inter-RAT Handover, SCC AS need control media anchor point and change the media flow transmission direction of itself and target side circuit access network into transmitted in both directions.

Embodiment three:

Consult Fig. 4; The embodiment of the invention three provides a kind of method for switching languages of cross wireless access technology; This method and implement two difference part and be: media anchor point is a transmitted in both directions with regard to the transmission direction that Media Stream between T2, T3 is set when distribution T 3 ports, and this method comprises:

401-414 and 301-314 are similar, repeat no more at this.

415, be after the P-CSCF of the 2nd UE service receives the reINVITE message that SCC AS sends; According to STN-SR; Judging reINVITE message is that the medium face that a SRVCC switches upgrades request; Send H.248ADD message to media anchor point, it is this SRVCC handoff request Resources allocation that this message is used to control media anchor point, and the remote descriptors of the T3 port of appointment media anchor point distribution is SRVCCIWF/MGW SDP.Media anchor point joins the remote descriptors of T3 in the conversation context of the one UE and the 2nd UE, and the topological relation that T1, T2 be set is { T1, T2; Isolate, promptly T1 is set, T2 does not connect, the topological relation that T2, T3 are set is { T2; T3; Two-way }, T2, T3 promptly are set connect, and the transmission direction of Media Stream is a transmitted in both directions between T2, T3.

416, be that the P-CSCF that the 2nd UE serves sends 200OK as replying to SCC AS, the SDP answer that carries among the 200OK is the related media information of T3.

417, SCC AS sends conversation shift to SRVCC IWF and accomplishes message (End of SessionTransfer).Conversation shift is accomplished among the SDP answer that carries in the message and is carried T3 related media information, and SRVCC IWF accomplishes the SDP answer that carries in the message through message H.248 with the session migration and notifies to MGW, and the medium face of accomplishing from the media anchor point to MGW is consulted.

At this moment; The 2nd UE is to the MGW of SRVCC IWF control; The MGW of SRVCC IWF control is to the MGW of MSC control; The MGW of MSC control is to the medium face path setting of RNS or BSS, and the subsequent media anchor point will send to E-UTRAN and RNS or E-UTRAN and BSS simultaneously from the downlink media stream of the 2nd UE, will send to the 2nd UE from the up Media Stream of a UE.

318-324 among 418-424 and the embodiment two is similar, repeats no more at this.

425, after the notified message of SCC AS (Not's), send reINVITE message, ask the more media information of new session to the 2nd UE.Wherein, this reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

SDP?Offer＝SRVCC?IWF/MGW?SDP

426, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message, find that a UE is deleted at the SDP of source IP access network, send H.248SUB message to media anchor point, this message is used to control media anchor point deletion t1 port.

Media anchor point in the embodiment of the invention three carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (comprising E-TURAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMSSession transfer causes; Thereby make SRVCC handoff time delay not comprise that IMSSession transfer causes interruption time delay, improve user experience; And when distribution T 3 ports; With regard to the transmission direction that Media Stream between T2 and T3 is set is transmitted in both directions; Need, not revise a UE transmission direction of Media Stream between T2 and T3 after switching to target side circuit access network; Make the SRVCC handover delay be merely the time delay of Inter-RAT Handover, improve user experience.

Need to prove; The technical scheme that the foregoing description three provides is not only applicable to the 2nd UE and a UE is in same IMS territory, is applicable to that also a UE is in the IMS territory, and the 2nd UE is in the CS territory; Perhaps a UE does not influence realization of the present invention with in the 2nd UE is in different IMS territories.

Embodiment four:

Consult Fig. 5; The embodiment of the invention four provides a kind of method for switching languages of cross wireless access technology; This method is with the difference part of implementing two: the P-CSCF that is UE service receives "Policy and Charging Rules Function entity (Policy and Charging Rules Function; After the disabled message of voice bearer of indication the one UE in source IP access network of PCRF) sending; Send indication to SCCAS and discharge the message of the preceding UE of switching in the session of IMS network, this method comprises:

301-323 among 501-523 and the embodiment two is similar, repeats no more at this.

524, after MME receives that message (Forward RelocComplete) is accomplished in forward direction reorientation that SRVCC IWF sends; Send deexcitation voice bearer request (Request BearerDeactivation) to S-GW, S-GW sends deexcitation voice bearer request (Request BearerDeactivation) to P-GW.

525, P-GW sends credit control request (Credit Control Request to PCRF; CCR); Indicating a UE unavailable at the voice bearer of source IP access network, PCRF to P-GW send Credit Control Answer (Credit Control Answer, CCA).

526, PCRF sends session abnormal terminals request (AbortSession Request to the P-CSCF that is UE service; ASR); To indicate the voice bearer of a UE in source IP access network unavailable; Be UE service P-CSCF to PCRF send the session abnormal terminals reply (Abort SessionRequest, ASA).

527, be that the P-CSCF that a UE serves sends BYE message to SCC AS; Need session and a switching preceding UE the session in IMS network of a UE in source IP access network be discharged with indication, SCCAS sends 200OK as response to the P-CSCF that is UE service.

528, after SCC AS receives BYE, send reINVITE message to the 2nd UE, ask the more media information of new session, wherein, this reINVITE message is the request message of the second renewal media information, and this this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

The SDP of SDP Offer=SRVCC IWF/MGW

529, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point; This message is used to control media anchor point deletion t1 port, and the transmission direction with data flow between T2, T3 port simultaneously changes transmitted in both directions into.

Media anchor point in the embodiment of the invention four carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (comprising E-UTRAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMSSession transfer causes; Thereby make SRVCC handoff time delay not comprise that IMSSession transfer causes interruption time delay, improve user experience.

Need to prove; The technical scheme that the foregoing description four provides is not only applicable to the 2nd UE and a UE is in same IMS territory, is applicable to that also a UE is in the IMS territory, and the 2nd UE is in the CS territory; Perhaps a UE does not influence realization of the present invention with in the 2nd UE is in different IMS territories.

Embodiment five:

Consult Fig. 6; The embodiment of the invention five provides a kind of method for switching languages of cross wireless access technology, and a UE will carry out SRVCC and switch, and a UE and the 2nd UE are positioned at same IMS territory; The one UE will be at universal land radio access web (Universal Terrestrial Radio Access Network; UTRAN) access way in inserts (HSPA, High Speed Packet Access) from high-speed packet and changes the circuit access into, and this method specifically comprises:

601, at call establishment stage, be the S-CSCF of UE service according to the initial filter standard or norm of a UE (Initial Filter Criteria, iFC); Call is arrived SCC AS; And at call establishment stage, be that the S-CSCF of UE service routes the call to be the I-CSCF of the 2nd UE service, S-CSCF and P-CSCF; The P-CSCF that is the 2nd UE service sends out H.248ADD message to media anchor point; Having carried in this message increases port T1 and the indication information of port T2 and the remote descriptors (SDP of a UE in the IP access network of source) of T1, and the remote descriptors of T2 (SDP of the 2nd UE).Media anchor point is the call setup context of a UE to the two UE; The i.e. conversation context of a UE and the 2nd UE; The remote descriptors of T1 and the remote descriptors of T2 are joined in the conversation context of a UE and the 2nd UE, and the transmission direction that Media Stream between T1 and T2 is set is a transmitted in both directions.

602, a UE sends measurement report to UTRAN.

603, UTRAN confirms a UE is switched to the CS territory according to measurement report, and (Serving GPRS Support Node SGSN) sends handoff request (HandoverRequired) to the service GPRS support node.

604, SGSN carries separation (Bearer Splitting), sends forward direction re-positioning request (Forward Reloc Req) to SRVCC IWF.

605, SRVCC IWF send to prepare handoff request (Prepare HO Req) to MSC, and it is ready to be with request MSC that the conversation of a UE switches to the CS territory.

606, MSC sends handoff request (Handover Req) to RNS or BSS, and it is ready to be with request RNS or BSS that the conversation of a UE switches to the CS territory, and MSC receives the handoff response (Handover Ack) that RNS or BSS send, and is example with RNS among the figure.

607, MSC sends to SRVCC IWF and prepares handoff response (Prepare Handover Resp) message.

608, set up carrying between SRVCC IWF and the MSC.

609, SRVCC UE initiates to send session transfer request message to SCC AS.

610, SCC AS returns the affirmation message to session transfer request to SRVCC IWF.

611, SRVCC IWF sends forward location response message (Forward Reloc Resp) to SGSN, starts the Inter-RAT Handover process of a UE.

612, SGSN sends switching command to UTRAN.

613, UTRAN sends switching command to a UE, is used to indicate a UE to change the circuit access way into from the high-speed packet access way of UTRAN.

614, SCC AS sends reINVITE message asking the more media information of new session to the 2nd UE, and this reINVITE message is first request message of new media call-information more, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

The SDP of SDP Offer=the one UE IP access network in the source, the SDP of SRVCC IWF/MGW.

615, be after the P-CSCF of the 2nd UE service receives the reINVITE message that SCCAS sends; According to STN-SR; Judging reINVITE message is that the medium face that a SRVCC switches upgrades request; Send H.248ADD message to media anchor point, it is this SRVCC handoff request Resources allocation that this message is used to control media anchor point, and the remote descriptors of the T3 port of appointment media anchor point distribution is the SDP of SRVCCIWF/MGW.Media anchor point joins the remote descriptors of T3 in the conversation context of the one UE and the 2nd UE, and the topological relation that T1, T2 be set is { T1, T2; Isolate, promptly T1 is set, T2 does not connect, the topological relation that T2, T3 are set is { T2; T3, one-way transmission }, T2, T3 connection promptly are set; And the voice transfer direction is an one-way transmission between T2, T3, and its direction is the direction from the 2nd UE to SRVCC IWF/MGW.

616, be that the P-CSCF that the 2nd UE serves sends 200OK as replying to SCC AS, carry SDP answer among the 200OK, SDP answer is the related media information of T3, and it comprises: the remote descriptors of T3 (SDP of SRVCC IWF/MGW).

617, SCC AS sends conversation shift to SRVCC IWF and accomplishes message (End of SessionTransfer).Conversation shift is accomplished among the SDP answer that carries in the message and is carried T3 related media information, and SRVCC IWF accomplishes the SDP answer that carries in the message through message H.248 with the session migration and notifies to MGW, and the medium face of accomplishing from the media anchor point to MGW is consulted.

At this moment, from the MGW → MGW → RNS of MSC control of media anchor point → SRVCC IWF control or the medium face path setting of BSS, the subsequent media anchor point will send to PS territory and the CS territory of UTRAN simultaneously from the downlink media stream of the 2nd UE.

Whether 618, SCC AS sends subscribe message SUBSCRIBE to SRVCC IWF, and the Inter-RAT that pulls subscription switches the completion incident, promptly ask SRVCC IWF indication Inter-RAT to switch and accomplish.

Because SCC AS sends SUBSCRIBE to SRVCC IWF; So SRVCC IWF should be arranged on the physical entity with MGCF, avoid MGCF between SRVCC IWF and SCCAS and cause SUBSCRIBE to take place by the situation that MGCF be transmitted to SRVCC IWF.

619, SRVCC IWF sends 200OK as replying to SCC AS.

620, a UE changes the circuit access into by the high-speed packet access in UTRAN, is the Inter-RAThandover process.

621, RNS or BSS send handoff completion message (HO Complete) to MSC, with the Inter-RAT Handover completion of notice MSC the one UE.

622, (send end signal SES), accomplishes with the Inter-RAT Handover that notifies MSC the one UE MSC to SRVCC IWF transmission end signal.

623, SRVCC IWF sends forward location to SGSN and accomplishes message (Forward RelocComplete/ACK).

624, after SRVCC IWF receives handoff completion message, send a notification message (Notify) to SCC AS, notice SCC AS switches completion, and SCC AS sends 200OK as replying to SRVCC IWF.

625, after the notified message of SCC AS (Notify), send reINVITE message, ask the more media information of new session to the 2nd UE.Wherein, this reINVITE message is second request message of media information more, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

SDP?Offer＝SRVCC?IWF/MGW?SDP

626, P-CSCF receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point, this message is used to control media anchor point deletion t1 port, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology; The difference of itself and the foregoing description five is: the 2nd UE is in the CS territory; In step 615, be to be the MGCF reception reINVITE message of the 2nd UE service, send H.248ADD message to media anchor point; Be to send 200OK as replying to SCC AS in the step 616, carry SDPanswer among the 200OK by MGCF; Be to receive reINVITE message in the step 626 by MGCF; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point, this message is used to control media anchor point deletion T1, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.Other steps and embodiment five are similar, repeat no more at this.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology; Its difference with the foregoing description five is: the 2nd UE is in the IMS territory different with a UE; In step 615; Be to be the IBCF reception reINVITE message of the 2nd UE service, send H.248ADD message to media anchor point; Be to send 200OK as replying to SCCAS in the step 616, carry SDP answer among the 200OK by IBCF; Be to receive reINVITE message in the step 626 by IBCF; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point, this message is used to control media anchor point deletion T1, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.Other steps and embodiment five are similar, repeat no more at this.

Another embodiment of the present invention provides a kind of method for switching languages of cross wireless access technology, and the difference of this method and embodiment six is: SRVCC IWF and MSC are positioned on the same physical entity, are promptly carried out the function of SRVCC IWF by the MSC of increased functionality type.

Media anchor point in the embodiment of the invention five carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (the PS territory that comprises UTRAN/GERAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise that IMS Session transfer causes interruption time delay, improve user experience.

Embodiment six:

Consult Fig. 7; The embodiment of the invention seven provides a kind of method for switching languages of cross wireless access technology; In this method; The one UE is positioned at UTRAN, this method and implement six difference part and be: media anchor point is a transmitted in both directions with regard to the transmission relation that Media Stream between T2, T3 is set when distribution T 3 ports, and this method comprises:

701-714 and 601-614 are similar, repeat no more at this.

715, be after the P-CSCF of the 2nd UE service receives the reINVITE message that SCCAS sends; According to STN-SR; Judging reINVITE message is that the medium face that a SRVCC switches upgrades request; Send H.248ADD message to media anchor point, it is this SRVCC handoff request Resources allocation that this message is used to control media anchor point, and the remote descriptors of the T3 port of appointment media anchor point distribution is SRVCC

IWF/MGW?SDP。Media anchor point joins the remote descriptors of T3 in the conversation context of the one UE and the 2nd UE, and the topological relation that T1, T2 be set is { T1, T2; Isolate, promptly T1 is set, T2 does not connect, the topological relation that T2, T3 are set is { T2; T3; Two-way }, T2, T3 promptly are set connect, and the media flow transmission direction is a transmitted in both directions between T2, T3.

716, be that the P-CSCF that the 2nd UE serves sends 200OK message as response to SCCAS, carry SDP answer among the 200OK, SDP answer is the related media information of T3, and it comprises: the remote descriptors of T3 (SDP of SRVCC IWF/MGW).

717, SCC AS sends conversation shift to SRVCC IWF and accomplishes message (End of SessionTransfer).Conversation shift is accomplished among the SDP answer that carries in the message and is carried T3 related media information, and SRVCC IWF accomplishes the SDP answer that carries in the message through message H.248 with the session migration and notifies to MGW, and the medium face of accomplishing from the media anchor point to MGW is consulted.

At this moment; The MGW-RNS of the MGW-MSC control of the 2nd UE-SRVCC IWF control or the medium face path setting of BSS; The subsequent media anchor point will send to PS territory and the CS territory of UTRAN simultaneously from the downlink media stream of the 2nd UE, will send to the 2nd UE from the up Media Stream of a UE.

618-624 among 718-724 and the embodiment six is similar, repeats no more at this.

725, after the notified message of SCC AS (Notify), send reINVITE message, ask the more media information of new session to the 2nd UE.Wherein, this reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

SDP?Offer＝SRVCC?IWF/MGW?SDP

726, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message, find that a UE is deleted at the SDP of source IP access network, send H.248SUB message to media anchor point, this message is used to control media anchor point deletion t1 port.

Need to prove; The technical scheme that the foregoing description six provides is not only applicable to the 2nd UE and a UE is in same IMS territory, is applicable to that also a UE is in the IMS territory, and the 2nd UE is in the CS territory; Perhaps a UE does not influence realization of the present invention with in the 2nd UE is in different IMS territories.

Media anchor point in the embodiment of the invention six carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (the PS territory that comprises UTRAN/GERAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise that IMS Session transfer causes interruption time delay, improve user experience; And when distribution T 3 ports; With regard to the transmission direction that Media Stream between T2 and T3 is set is transmitted in both directions; Need, not revise a UE transmission direction of Media Stream between T2 and T3 after switching to target side circuit access network; Make the SRVCC handover delay be merely the time delay of Inter-RAT Handover, improve user experience.

Embodiment seven:

Consult Fig. 8; The embodiment of the invention seven provides a kind of method for switching languages of cross wireless access technology; A UE is positioned at UTRAN in this method; This method is with the difference part of implementing five: PCRF sends to the P-CSCF that is UE service and indicates the voice bearer disabled message of a UE in source IP access network, is that the P-CSCF of UE service sends the message that indication discharges the preceding UE of switching session in the IMS network to SCC AS, and this method comprises:

601-623 among 801-823 and the embodiment five is similar, repeats no more at this.

824, after SGSN receives that forward location that SRVCC IWF sends is accomplished message (Forward RelocComplete); Send deletion PDP Context request (Delete PDP ContextRequest) to GGSN; With request deexcitation voice bearer, GGSN sends the deletion PDP Context to SGSN and replys (Delete PDP Context Response).

825, GGSN sends credit control request (Credit Control Request to PCRF; CCR); Indicating the voice bearer of a UE in source IP access network unavailable, PCRF to GGSN send Credit Control Answer (Credit Control Answer, CCA).

826, PCRF sends session abnormal terminals request (AbortSession Request to the P-CSCF that is UE service; ASR); To indicate the voice bearer of a UE in source IP access network unavailable; Be UE service P-CSCF to PCRF send the session abnormal terminals reply (Abort SessionRequest, ASA).

827, be that the P-CSCF that a UE serves sends BYE message to SCC AS; Need session and a switching preceding UE the session in IMS network of a UE in source IP access network be discharged with indication, SCC AS sends 200OK as response to the P-CSCF that is UE service.

828, after SCC AS receives BYE, send reINVITE message to the 2nd UE, ask the more media information of new session, wherein, this reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

The SDP of SDP Offer=SRVCC IWF/MGW

829, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point; This message is used to control media anchor point deletion t1 port, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.

Media anchor point in the embodiment of the invention seven carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (the PS territory that comprises UTRAN/GERAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Sessiontransfer causes; Thereby make SRVCC handoff time delay not comprise that IMS Session transfer causes interruption time delay, improve user experience.

Need to prove; The technical scheme that the foregoing description seven provides is not only applicable to the 2nd UE and a UE is in same IMS territory, is applicable to that also a UE is in the IMS territory, and the 2nd UE is in the CS territory; Perhaps a UE does not influence realization of the present invention with in the 2nd UE is in different IMS territories.

In the foregoing description two, four and embodiment five, seven; SCCAS knows through handover event from a UE to SRVCC IWF that subscribe to whether a UE has accomplished Inter-RAT Handover; After Inter-RAT Handover accomplished, SCC AS changed the transmission direction of Media Stream between T2 on the media anchor point and T3 into transmitted in both directions.Therefore, require SRVCC IWF and MGCF on same physical entity, and support Session Initiation Protocol, avoid MGCF between SRVCC IWF and SCC AS and cause relevant information can't be transmitted to the situation generation of SCCAS by MGCF.When if SRVCC IWF is deployed on the different physical entities respectively with MGCF, the technical scheme that can adopt following embodiment eight and embodiment nine to provide realizes the present invention.

Embodiment eight:

Consult Fig. 9, the embodiment of the invention eight provides a kind of method for switching languages of cross wireless access technology, and a UE will carry out the SRVCC switching in this method, and a UE and the 2nd UE are positioned at same IMS territory, and a UE is positioned at E-UTRAN, and this method specifically comprises:

301-322 among 901-922 and the embodiment two is similar, repeats no more at this.

923, SRVCC IWF is to home subscriber server (Home Subscriber Server; HSS) send non-structured supplementary service data (Unstructured Supplementary Service Data; USSD) message; This message is carried the completed user's of Inter-RAT Handover mobile subscriber's international number (The Mobile Station ISDN number, MSISDN) sign.

924, HSS sends a notification message (Sh-Notify) to SCC AS through Sh interface, carries the completed user's of Inter-RAT Handover MSISDN sign in this message.

925, SCC AS is according to the MSISDN sign of carrying in the notification message; Confirm that a UE has accomplished Inter-RAT Handover; Send reINVITE message to the 2nd UE, ask the more media information of new session, wherein; This reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

The SDP of SDP Offer=SRVCC IWF/MGW

926, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point; This message is used to control media anchor point deletion t1 port, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.

927, SRVCC IWF sends the forward direction reorientation to MME and accomplishes message (Forward RelocComplete/ACK).

Need to prove; The technical scheme that the foregoing description eight provides is not only applicable to the 2nd UE and a UE is in same IMS territory, is applicable to that also a UE is in the IMS territory, and the 2nd UE is in the CS territory; Perhaps a UE does not influence realization of the present invention with in the 2nd UE is in different IMS territories.

Media anchor point in the embodiment of the invention eight carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (comprising E-UTRAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMSSession transfer causes; Thereby make SRVCC handoff time delay not comprise that IMSSession transfer causes interruption time delay, improve user experience.

Embodiment nine:

Consult Figure 10; The embodiment of the invention nine provides a kind of method for switching languages of cross wireless access technology; A UE will be at universal land radio access web (Universal Terrestrial Radio AccessNetwork in this method; UTRAN) access way in inserts (HSPA, High Speed PacketAccess) from high-speed packet and changes the circuit access into, and this method specifically comprises:

1001-1022 and 601-622 are similar, repeat no more at this.

1023, SRVCC IWF sends non-structured supplementary service data to HSS (UnstructuredSupplementary Service Data, USSD) message, this message is carried the completed user's of Inter-RAT Handover MSISDN sign.

1024, HSS sends a notification message (Sh-Notify) to SCC AS through Sh interface, carries the completed user's of Inter-RAT Handover MSISDN sign in this message.

1025, SCC AS is according to the MSISDN sign of carrying in the notification message; Confirm that a UE has accomplished Inter-RAT Handover; Send reINVITE message to the 2nd UE, ask the more media information of new session, wherein; This reINVITE message is the request message of the second renewal media information, and this reINVITE message comprises:

Request-URI=STN-SR (SRVCC Handover Number)

The SDP of SDP Offer=SRVCC IWF/MGW

1026, be that the P-CSCF that the 2nd UE serves receives above-mentioned reINVITE message; Find that a UE is deleted at the SDP of source IP access network; Send H.248SUB message to media anchor point; This message is used to control media anchor point deletion t1 port, and the transmission direction with Media Stream between T2, T3 simultaneously changes transmitted in both directions into.

1027, SRVCC IWF sends the forward direction reorientation to SGSN and accomplishes message (Forward RelocComplete/ACK).

Media anchor point in the embodiment of the invention nine carries out in the SRVCC handoff procedure downlink media stream of the 2nd UE is sent to source IP access network (the PS territory that comprises UTRAN/GERAN) and target side circuit access network (the CS territory that comprises UTRAN/GERAN) simultaneously at a UE; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise that IMS Session transfer causes interruption time delay, improve user experience.

In above-mentioned each embodiment of the present invention; SCC AS sends reINVITE message requires its control media anchor point modification port to the control network element (P-CSCF/MGCF/IBCF) of media anchor point topological relation; What carry among the Request-URI in the reINVITE message is STN-SR (Handover Number); If the control network element (P-CSCF/MGCF/IBCF) of media anchor point is not supported scheme of the present invention, then this reINVITE message can can't continue route and goes down to cause IMS session transfer failure.To this, can detect P-CSCF/MGCF/IBCF and whether support SRVCC performance optimization function by SCC AS at call establishment stage.SRVCC performance optimization function refers to that P-CSCF/MGCF/IBCF can discern STN-SR (Handover Number), and topological relation is set up or revised to the notice media anchor point.

Participate in Figure 11, whether the control network element (P-CSCF/MGCF/IBCF) of describing SCC AS detection media anchor point as follows supports the process of SRVCC performance optimization:

1101, after the session between a UE and the 2nd UE is set up, SCC AS sends SIP option message (SIP Option) message, whether supports the SRVCC performance optimization with the control network element (P-CSCF/MGCF/IBCF) of inquiry media anchor point.

1102, the control network element (P-CSCF/MGCF/IBCF) of media anchor point returns 200OK message as replying, and carries the indication information of whether supporting the SRVCC performance optimization in this message.

After follow-up SCC AS receives that trigger request (Initiation of session transfer) is shifted in session; If the control network element (P-CSCF/MGCF/IBCF) of media anchor point is supported SRVCC performance optimization function; Then SCC AS sends reINVITE; Request-URI=STN-SR, SDP=the one UE be in the SDP information of source IP access network, SRVCC IWF/MGW SDP).If the control network element (P-CSCF/MGCF/IBCF) of media anchor point is not supported SRVCC performance optimization function, then SCC AS sends reINVITE, Request-URI=the 2nd UE URI, the SDP of SDP=SRVCC IWF/MGW).

Consult 12, the embodiment of the invention ten provides a kind of media anchor point, and this media anchor point can be MGW or SBC, and this media anchor point comprises:

Message sink unit 1201 is used to receive the message that indication increases port, and the message that said indication increases port is used to indicate said media anchor point to increase the port of communicating by letter with target side circuit access network; Receive the disabled message of indication first port;

Port assignment unit 1202 is used for the message according to said indication increase port, the port that distributes the 3rd port conduct to communicate by letter with target side circuit access network;

Media Stream receiving element 1203 is used for receiving the downlink media stream from the 2nd UE through second port;

The first Media Stream transmitting element 1204 is used for said downlink media stream is sent to source IP access network through first port;

The second Media Stream transmitting element 1205 is used for said downlink media stream is sent to target side circuit access network through said the 3rd port;

Control unit 1206 is used for after receiving the disabled message of said indication first port, and control is not sent the downlink media stream from the 2nd UE to said source IP access network.

Wherein, carry the Session Description Protocol SDP of a UE in the message of said indication increase port at target side circuit access network; Said port assignment unit 1202 is used for adding the 3rd port information at the conversation context of a UE and the 2nd UE, and said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is the direction from second port to the, three ports; Perhaps, in the conversation context of a UE and the 2nd UE, add the 3rd port information, said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is a transmitted in both directions.

This media anchor point also comprises:

Contextual information is set up the unit; Be used at call establishment stage; Set up the conversation context of a UE and the 2nd UE; In the conversation context of a said UE and the 2nd UE, add the information of first port and the information of second port; And be provided with that the media flow transmission direction is a transmitted in both directions between first port and second port, and the information of said first port comprises the SDP at source IP access network as a UE of the remote descriptors of first port, the information of second port comprises the SDP as the 2nd UE of the remote descriptors of second port;

Contextual information is revised the unit, is used for transmission direction that conversation context at a UE and the 2nd UE is provided with Media Stream between second port and the 3rd port and changes transmitted in both directions into by the direction of second port to the, three ports.

Concrete; In the conversation context of the first Media Stream transmitting element 1204 according to a UE and the 2nd UE between set first port and second port transmission direction of Media Stream and a UE at the SDP of source IP access network said downlink media stream is sent to source IP access network through first port.

Wherein, indicating the disabled message of first port is the message of indication deletion first port; Control unit 1206 is used for from the information of conversation context deletion first port of a UE and the 2nd UE.

Media anchor point carries out will sending to source IP access network and target side circuit access network from the downlink media stream of the 2nd UE simultaneously in the SRVCC handoff procedure at a UE in the embodiment of the invention ten; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminated the medium face interruption that IMS Session transfer causes; Thereby make SRVCC handoff time delay not comprise the interruption time delay that IMS Session transfer causes, improve user experience.

Embodiment 11:

The embodiment of the invention 11 provides a kind of network system, and it comprises: media anchor point control network element, media anchor point and SCCAS, wherein,

Carry out in the SRVCC handoff procedure at a UE in the embodiment of the invention 11; Media anchor point is under the control of media anchor point control network element; To send to source IP access network and target side circuit access network from the downlink media stream of the 2nd UE simultaneously; Guarantee to receive immediately when a UE switches to target side circuit access network the downlink media stream of the 2nd UE; Eliminate the medium face interruption that IMS Session transfer causes, thereby made SRVCC handoff time delay not comprise the interruption time delay that IMS Session transfer causes, improved user experience.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; Read-only memory for example, disk or CD etc.

More than method for switching languages, equipment and the network system of the cross wireless access technology that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims

1. the method for switching languages of a cross wireless access technology is characterized in that, comprising:

2. method according to claim 1 is characterized in that,

Carry a UE in the Session Description Protocol SDP of target side circuit access network information in the message of said indication increase port;

The port that said distribution the 3rd port conduct is communicated by letter with target side circuit access network is specially:

In the conversation context of a UE and the 2nd UE, add the 3rd port information, said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is the direction from second port to the, three ports;

Perhaps,

In the conversation context of a UE and the 2nd UE, add the 3rd port information, said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is a transmitted in both directions.

3. method according to claim 2 is characterized in that,

Media anchor point is after receiving indication first port disabled message, and this method also comprises: in the conversation context of a UE and the 2nd UE, change the transmission direction of Media Stream between second port and the 3rd port into transmitted in both directions by the direction of second port to the, three ports.

4. method according to claim 1 is characterized in that,

Receive in media anchor point before the message of indication increase port, this method also comprises:

Media anchor point control network element receives the request message that media information is upgraded in first of service set and application server for continuity SCC AS transmission;

Upgrade the single wireless continuous voice call SRVCC Handover Number that carries in the request message of media information according to said first and confirm that a UE will carry out SRVCC and switch; From the request message of the said first renewal media information, obtain a UE and join in the message of indication increase port, send the message that said indication increases port to said media anchor point in the SDP information of target side circuit access network.

5. method according to claim 4 is characterized in that,

Also comprise the SDP information of a UE in the request message of the said first renewal media information at source IP access network;

After the request message of the first renewal media information that media anchor point control network element reception SCC AS sends; This method also comprises: media anchor point control network element is received the request message of the second renewal media information that SCC AS sends; Confirm that said second upgrades in the request message of media information and do not comprise a UE when the SDP information of source IP access network, send the disabled message of indication first port to said media anchor point.

6. method according to claim 5 is characterized in that,

Send at SCCAS before the request message of the second renewal media information, this method also comprises:

Single wireless continuous voice call interworking function entity SRVCC IWF sends the completed message of switching of notifying a UE wireless access technology to SCC AS;

Perhaps; Be after the Proxy Call Session Control Function P-CSCF of UE service receives the disabled message of voice bearer of indication the one UE in source IP access network that "Policy and Charging Rules Function entity PCRF sends, to send indication to said SCCAS and discharge the message of switching preceding UE session in the IMS network;

Perhaps, SRVCC IWF sends to SCC AS through home subscriber server HSS and notifies a said UE to accomplish the message that wireless access technology is switched.

7. method according to claim 4 is characterized in that, before SCC AS sent the request message of the first renewal media information to the 2nd UE, this method also comprised:

SCC AS obtains the indication information whether said media anchor point control of expression network element has SRVCC performance optimization ability from media anchor point control network element.

8. method according to claim 1 is characterized in that,

This method also comprises: at call establishment stage; Media anchor point adds the information of first port and the information of second port in the conversation context of a said UE and the 2nd UE; And be provided with that the media flow transmission direction is a transmitted in both directions between first port and second port; The information of said first port comprises the SDP information at source IP access network as a UE of the remote descriptors of first port, and the information of second port comprises the SDP information as the 2nd UE of the remote descriptors of second port;

Said downlink media stream is specially to the transmission of source IP access network through first port:

In the conversation context according to a UE and the 2nd UE between set first port and second port transmission direction of Media Stream and a UE in the SDP information of source IP access network said downlink media stream is sent to source IP access network through first port.

9. method according to claim 1 is characterized in that,

The disabled message of said indication first port is the message of indication deletion first port;

Said control does not comprise to the downlink media stream that said source IP access network sends from the 2nd UE:

The information of deletion first port from the conversation context of a UE and the 2nd UE.

10. a media anchor point is characterized in that, comprising:

11. media anchor point according to claim 10 is characterized in that,

Said port assignment unit is used for adding the 3rd port information at the conversation context of a UE and the 2nd UE, and said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is the direction from second port to the, three ports; Perhaps, in the conversation context of a UE and the 2nd UE, add the 3rd port information, said the 3rd port information comprises the SDP information at target side circuit access network as a UE of the 3rd port remote descriptors; The transmission direction that Media Stream between second port and the 3rd port is set in the conversation context of a UE and the 2nd UE is a transmitted in both directions.

12. media anchor point according to claim 11 is characterized in that, also comprises:

13. media anchor point according to claim 10 is characterized in that, also comprises:

The said first Media Stream transmitting element; Be used for according to the transmission direction of Media Stream between set first port of the conversation context of a UE and the 2nd UE and second port and a UE said downlink media stream being sent to source IP access network through first port at the SDP of source IP access network.

14. media anchor point according to claim 10 is characterized in that,

Said control unit is used for from the information of conversation context deletion first port of a UE and the 2nd UE.

15. a network system is characterized in that, comprising: media anchor point control network element, media anchor point and service set and application server for continuity SCC AS, wherein,

Said SCC AS; Be used for when a UE carries out single wireless continuous voice call SRVCC switching; The request message of a UE at the first renewal conversation media information of the Session Description Protocol SDP of target side circuit access network carried in transmission; After a UE has switched in the target side circuit access network, do not carry the request message of a UE at the second renewal conversation media information of the SDP of source IP access network to the transmission of media anchor point control network element;