CN101848509B

CN101848509B - Method and system for switching terminal from home node B to macrocell system

Info

Publication number: CN101848509B
Application number: CN200910128494.0A
Authority: CN
Inventors: 谢振华; 郝振武
Original assignee: ZTE Corp Nanjing Branch
Current assignee: ZTE Corp
Priority date: 2009-03-23
Filing date: 2009-03-23
Publication date: 2014-07-23
Anticipated expiration: 2029-03-23
Also published as: CN101848509A

Abstract

The invention discloses a method and a system for switching a terminal from a home node B (HNB) to a macrocell system. The method comprises the following steps of: establishing IP multimedia subsystem (IMS) session with remote equipment through an HNB system based on the IMS by using the terminal, wherein the connection established by the session comprises the IMS connection M1 between the HNB and the remote equipment; when the terminal needs to be switched into the macrocell system, transmitting a switching request message to an enhanced mobile switching center for single radio voice call continuity (eMSC for SRVCC) through an Sv interface between the HNB and the eMSC for SRVCC by using the HNB; and returning a switching response message to the HNB through the Sv interface after the eMSC for SRVCC prepares resources for switching, and establishing the circuit exchange connection M2 between the terminal and the eMSC for SRVCC after the HNB notifies the terminal of executing the switching. Due to the adoption of the method and the system, the terminal can be switched from the HNB to the macrocell system by using the conventional eMSC for SRVCC as an auxiliary point, so that the compatibility of the system is improved.

Description

A kind of method and system of switching terminal from home node B to macrocell system

Technical field

The present invention relates to the communications field, relate in particular to a kind of method and system of switching terminal from home node B to macrocell system.

Background technology

Home eNodeB (HNB:Home NodeB) is by third generation partner program (3rd GenerationPartnership Project, be called for short 3GPP) a kind of microcellulor access way of proposing, be deployed in place that the macrocellular signals such as building are difficult to arrive and realize signal and cover.

In HNB framework, HNB is by femto gateway (HNB-GW:Home NodeBGateway) access circuit switching (CS:Circuit Switch) network of 2G/3G and packet switch (PS:Packet Switch) network of 2G/3G to realize business, and HNB and HNB-GW can be described as HNB subsystem.If HNB also supports to access IP (network interconnection agreement by HNB-GW, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia Core NetworkSubsystem, be called for short IMS), we are called HNB-IMS subsystem (i.e. the family base station system based on IMS), thereby also can for user provides miscellaneous service, serve by IMS.The major function entity of 2G/3G network is MSC (MSC:Mobile Switch Center, mobile switching centre) server (Server) and SGSN (SGSN:Serving GPRS Supporting Node), wherein MSC is responsible for CS territory part, and SGSN is responsible for PS territory part.IMS is also a kind of IP-based network architecture being proposed by 3GPP, has built the opening of and service environment flexibly, and supporting multimedia application can provide abundant multimedia service for user.When subscriber equipment (User Equipment, be called for short UE) is under HNB-IMS subsystem during access network, HNB can access IMS network by HNB-GW, by IMS network, provides business, such as exhaling, exhale eventually etc.When user has session under it, then move under the macrocellular of 2G/3G, thereby while switching, HNB-IMS subsystem to be realized not interrupting of user conversation in this process.From the angle of contrast, 2G/3G network system can be described as macrocell system.

In IMS business system, key-course is separated with operation layer, and key-course does not provide concrete business, and the functions such as necessary triggering, route, charging are only provided to operation layer.In key-course, business triggering and control function are CSCF (Call Session Control Function, be called for short CSCF, be divided into that to act on behalf of Proxy be P-CSCF, inquiry Interrogating I-CSCF and service Serving S-CSCF three types, wherein the type of I-CSCF is optional, that take the main responsibility is S-CSCF) complete, operation layer is by a series of application servers (Application Server, be called for short AS) form, concrete business service can be provided, AS can be entity independently, also may reside in S-CSCF.Key-course (S-CSCF) triggers according to user's CAMEL-Subscription-Information service control, calls the business on AS, realizes business function.In the service switchover of IMS, or cry in business continuance business, business continuance AS (Service Continuity Control AS, abbreviation SCC AS) be responsible for the signaling paths of grappling session, be referred to as the anchor point of signaling paths, while making to switch, although UE, to the signaling paths of SCC AS, variation has occurred, but SCC AS still remains unchanged to the signaling paths of far-end, thus the generation that not perception of far-end is switched.

Fig. 1 is existing HNB system schematic, has described UE in the situation that HNB accesses, the signaling paths of session and media path.UE is mutual by wireless access and HNB, and HNB and HNB-GW set up secure tunnel (mode of the oblique line of usining in figure filling is as signal), and by this tunnel, HNB sends 2G/3G signaling to 2G/3G network, transmission 2G/3G media; (in figure, dotted portion represents signaling paths with transmission IMS media to IMS network, to send IMS signaling, entity thick line part presentation medium path), specifically connect 2G/3G network or IMS network, by HNB, determined, in general, HNB is used IMS network to realize communication, only at UE when the macrocellular in the CS territory of 2G/3G network is switched to HNB and comes, HNB is just used 2G/3G network.HNB is by interworking function (the Interworking Function of 2G/3G network, be called for short IWF) be connected with 2G/3G network, IWF is exactly a MSC (Mobile Switch Center substantially, mobile switching centre, be called for short MSC) server, but be not exclusively equal to MSC Server, this IWF may have the mutual ability in some and IMS territory, for UE, from IMS territory, is switched to macrocell system.

Fig. 2 is existing HNB system architecture schematic diagram, has described the signaling interface situation of each major function inter-entity of HNB system, is described below:

Interface S202, Uu interface, the wave point of UE and HNB; Standardization;

Interface S204, Iuh interface, HNB and HNB-GW set up after secure tunnel, and Iuh interface message is transmitted on this secure tunnel, makes the mutual transfer control signaling of HNB and HNB-GW; This interface is definitim flow and message format not yet;

Interface S206, IuCS interface, the interface between HNB-GW and IWF, is the interface between base station and MSC Server in existing 2G/3G network, standardization, from the character of this interface, IWF has simulated the function of part MSC Server;

Interface S208, I2 interface, IWF directly with the interface of IMS network interaction, standardization, this interface can not exist, IWF is and IMS network interaction indirect by 2G/3G network;

Interface S210, HGm interface, HNB directly and the interface of IMS network interaction, for UE and internetwork interface in existing IMS network, standardization, the information on this interface is to transmit by the secure tunnel between HNB and HNB-GW physically, can adopt independently secure tunnel, also can adopt Iuh interface protocol is transmitted as underlying protocol, the content that is about to HGm interface message is encapsulated in Iuh interface message form, at Iuh interface, transmits.

Generally, in handoff procedure, require MSC on media path, from MSC, it seems, base station is connected to near-end to the media of MSC, opposite side is far-end, and MSC receives after the handover request of base station, completes handover operation, after having switched, this MSC is still on media path, and far-end is constant.With system architecture of the prior art, before switching terminal from home node B to macrocell system, terminal and the remote equipment IMS that passes through IMS network by HNB system made is connected and carries out session, the MSC of IWF simulation is connected without any media with HNB system and IMS system, if complete the switching from HNB to macrocell system by IWF, need to upgrade to existing MSC, making MSC is HNB-IMS system customization specific function (comprising functions such as setting up media path).Existing enhancing (the Enhanced MSC of mobile switching centre, be called for short eMSC) not to use IuCS Interface realization PS territory session to the switching of CS territory session, how to use framework and the component devices (being mainly to use existing eMSC) of original system to complete switching, in prior art, do not provide solution.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of method and system of switching terminal from home node B to macrocell system, improves system compatibility.

In order to address the above problem, the invention provides a kind of method of switching terminal from home node B to macrocell system, comprise: terminal is set up IMS session by the Home eNodeB HNB system based on multimedia subsystem, IMS and remote equipment, the connection of this session establishment comprises that described Home eNodeB HNB is connected M1 with the IMS media between described remote equipment; When described terminal need be switched to macrocell system, described HNB by and femto gateway HNB-GW between control signal interface be that Iuh interface sends switching controls message to described HNB-GW, described HNB-GW by and single mode voice continuity control that to strengthen mobile switching centre be that data field session between eMSC for SRVCC is that Sv interface transmission handover request message is to described eMSC for SRVCC to circuit domain session switching control signaling interface; Described eMSC forSRVCC prepares after resource for switching, by described Sv interface, to described HNB-GW, return to switching response message, described HNB-GW sends switching controls response message by described Iuh interface to described HNB, described HNB notifies described terminal to carry out after switching, sets up described terminal and is connected M2 with the circuit switching between described eMSC forSRVCC.

Further, said method also has following characteristics:

When the switching to macrocell system is carried out or after completing, described eMSC for SRVCC carries out media renewal to described remote equipment, specifically comprises: described eMSC for SRVCC is sent to business continuance server S CC AS by eMSC forSRVCC side media resource information; Described SCC AS sends the IMS update request of carrying described eMSC for SRVCC side media resource information to described remote equipment, described remote equipment is carried out to media renewal.

Further, said method also has following characteristics:

At described eMSC for SRVCC, described remote equipment is carried out before media renewal, described eMSCfor SRVCC is sent to described HNB by business continuance server S CC AS by eMSC for SRVCC side media resource information, and described HNB is sent to described eMSC for SRVCC by described SCC AS by HNB media resource information; Between described HNB and described eMSC for SRVCC, set up IMS and be connected M3; Described HNB couples together described M3 and described M1 at described HNB place, after described terminal completes to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 is connected M1 formation Temporary access with IMS and carry out session, until the media of described remote equipment have been upgraded.

Further, said method also has following characteristics:

At described eMSC for SRVCC, described remote equipment is carried out before media renewal, described HNB consults to set up IMS with described eMSC for SRVCC and is connected M3; Described HNB sends handoff completion message to described HNB-GW by described Iuh interface, and carry described IMS and connect the media resource information of M1 and the media resource information that described IMS connects M3, described HNB-GW couples together described connection M3 at described HNB-GW place with the described M1 of connection, after described terminal completes to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 is connected M1 formation Temporary access with IMS and carry out session, until the media of described remote equipment have been upgraded.

In order to solve the problems of the technologies described above, the present invention also provides a kind of terminal switching system, comprise the Home eNodeB HNB system based on multimedia subsystem, IMS and set up the terminal of IMS session by the Home eNodeB HNB system based on multimedia subsystem, IMS and remote equipment, also comprising: it is eMSC for SRVCC that single mode voice continuity is controlled enhancing mobile switching centre;

Described HNB, for when described terminal need be switched to macrocell system, by and femto gateway HNB-GW between control signal interface be that Iuh interface sends switching controls message to described HNB-GW; Also for notifying described terminal to carry out after receiving the switching controls response message that described HNB-GW sends, switch;

Described HNB-GW, for after receiving the switching controls message that described HNB sends, by and described eMSC for SRVCC between data field session to circuit domain session switching control signaling interface, be that Sv interface transmission handover request message is to described eMSC for SRVCC; Also, for after receiving the switching response message of described eMSC for SRVCC, by described Iuh interface, to described HNB, send switching controls response message;

Described eMSC for SRVCC, for after receiving the handover request message that described HNB-GW sends, prepares resource for switching, and to described HNB-GW, returns to switching response message by described Sv interface.

Further, above-mentioned terminal switching system also has following characteristics:

Described eMSC for SRVCC, while also carrying out for the switching to macrocell system or after completing, carries out media renewal to described remote equipment, and eMSC for SRVCC side media resource information is sent to business continuance server S CC AS;

Described SCC AS, for send the IMS update request of carrying described eMSC for SRVCC side media resource information to described remote equipment, carries out media renewal to described remote equipment.

Described eMSC for SRVCC, also for described remote equipment is carried out before media renewal, is sent to described HNB by business continuance server S CC AS by eMSC for SRVCC side media resource information;

Described HNB, also for being sent to described eMSC for SRVCC by described SCC AS by HNB media resource information; Also for described eMSC for SRVCC between set up IMS and be connected M3, and at described HNB place, described M3 and described M1 are coupled together, after forming described terminal and completing to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 and be connected the Temporary access that M1 carries out session with IMS.

Described eMSC for SRVCC, also for described remote equipment is carried out before media renewal, consults to set up IMS with described HNB and is connected M3;

Described HNB, also for sending handoff completion message to described HNB-GW by described Iuh interface, and carries the media resource information of described IMS connection M1 and the media resource information that described IMS connects M3;

Described HNB-GW, also for described connection M3 being coupled together with the described M1 of connection at described HNB-GW place, after forming described terminal and completing to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 and be connected the Temporary access that M1 carries out session with IMS.

In order to solve the problems of the technologies described above, the present invention also provides a kind of method of switching terminal from home node B to macrocell system, comprising:

Terminal is set up IMS session by the Home eNodeB HNB system based on multimedia subsystem, IMS and remote equipment, and the connection of this session establishment comprises that described Home eNodeB HNB is connected M1 with the IMS media between described remote equipment;

When described terminal need be switched to macrocell system, described HNB by and single mode voice continuity control to strengthen mobile switching centre be that data field session between eMSC for SRVCC sends handover request message to described eMSC for SRVCC to circuit domain session switching control signaling interface Sv interface;

Described eMSC for SRVCC prepares, after resource, by described Sv interface, to described HNB, to return to switching response message for switching, and described HNB notifies described terminal to carry out after switching, sets up described terminal and is connected M2 with the circuit switching between described eMSC for SRVCC.

Further, said method also has following characteristics:

At described eMSC for SRVCC, described remote equipment is carried out before media renewal, described HNB consults to set up IMS with described eMSC for SRVCC and is connected M3;

Described HNB is that Iuh interface sends handoff completion message to described HNB-GW by the control signal interface between femto gateway HNB-GW, and carry described IMS and connect the media resource information of M1 and the media resource information that described IMS connects M3, described HNB-GW couples together described connection M3 at described HNB-GW place with the described M1 of connection, after described terminal completes to the switching of macrocell system, by circuit switching, be connected M2 with described remote equipment, IMS connection M3 is connected M1 formation Temporary access with IMS carries out session, until the media of described remote equipment have been upgraded.

Described HNB, for when described terminal need be switched to macrocell system, by and described eMSCfor SRVCC between data field session to circuit domain session switching control signaling interface Sv interface, send handover request message to described eMSC for SRVCC; Also, for after receiving the switching response message of described eMSC for SRVCC, notify described terminal to carry out and switch;

Described eMSC for SRVCC, is used to switch and prepares, after resource, by described Sv interface, to described HNB, to return to switching response message.

Described HNB, is also that Iuh interface sends handoff completion message to described HNB-GW for the control signal interface by between femto gateway HNB-GW, and carries the media resource information of described IMS connection M1 and the media resource information that described IMS connects M3;

Adopt method and system of the present invention, can use existing single mode voice continuity to control and strengthen mobile switching centre (eMSC for SRVCC:Enhanced MSC for Single Radio VoiceContinuity Control) for auxiliary magnet completes terminal from home node B to the switching of macrocell system, improve system compatibility.

Accompanying drawing explanation

Fig. 1 is HNB connecting system schematic diagram in prior art;

Fig. 2 is HNB-IMS system architecture schematic diagram in prior art;

Fig. 3 is HNB-IMS system architecture schematic diagram 1 in embodiment

Fig. 4 is HNB-IMS system architecture schematic diagram 2 in embodiment;

Fig. 5 switches in embodiment and the summary message flow chart of new technological process more;

Fig. 6 is the flow chart of embodiment mono-;

Fig. 7 is the flow chart of embodiment bis-;

Fig. 8 is the flow chart of embodiment tri-;

Fig. 9 is the flow chart of embodiment tetra-;

Figure 10 is the flow chart of embodiment five.

Embodiment

Below in conjunction with drawings and Examples, describe the present invention.In following embodiment and accompanying drawing, " 2G/3G " represents that the method for the present embodiment is applicable to CS territory or the PS territory in 2G or 3G system.

The first system framework

Fig. 3 is HNB-IMS system architecture schematic diagram 1 of the present invention, has described the signaling interface situation of each major function inter-entity of HNB-IMS system, is described below:

Interface S302, Uu interface, the wave point of UE and HNB;

Interface S304, Iuh interface (being HNB gateway control signaling interface), HNB and HNB-GW set up after secure tunnel, and Iuh interface message is transmitted on this secure tunnel, makes the mutual transfer control signaling of HNB and HNB-GW;

Interface S306, IuCS interface (being circuit domain base station signaling interface), interface between HNB-GW and CS core net, for the interface between MSC Server and CS base station in existing 2G/3G network, message on this interface can be that the effective carrier form of HNB using IuCS interface message as Iuh message is transferred to HNB-GW (content that is about to IuCS interface message is encapsulated in Iuh interface message form, in the transmission of Iuh interface), then by HNB-GW, take out and transmit, also after can deriving IuCS interface message according to Iuh message content by HNB-GW, transmit, concrete transmission form, the present invention is not limited to the method for mentioning in this step, adopt influence technique effects not of which kind of method,

Because CS core net refers to the network that MSC Server forms, HNB-GW is mutual by IuCS interface and one or more MSC Server, and eMSC for SRVCC is a kind of MSCServer of enhancing, therefore HNB-GW also can be configured to by IuCS interface and eMSC for SRVCC alternately, but is only limited to the funtion part of non-enhancing in use eMSC for SRVCC.

Interface S308, Sv interface (being that packet domain session is to the switching controls interface of circuit domain session), interface between HNB-GW and eMSC for SRVCC, for realizing the interface switching, the standardization of interface operation and flow process, but not yet standardization of message format in existing 2G/3G network between eMSC forSRVCC and SGSN, character due to this interface, from eMSC for SRVCC, it seems, switch while occurring, HNB-GW is exactly a SGSN;

Interface S310, I2 interface, eMSC for SRVCC directly with the interface of IMS network interaction, this interface can not exist, eMSC for SRVCC is and IMS network interaction indirect by 2G/3G network;

Interface S312, HGm interface, HNB directly and the interface of IMS network interaction, for UE and internetwork interface in existing IMS network, standardization, information on this interface is to transmit by the secure tunnel between HNB and HNB-GW physically, can adopt independently secure tunnel, also can adopt Iuh interface protocol is transmitted as underlying protocol, the content that is about to HGm interface message is encapsulated in Iuh interface message form, at Iuh interface, transmit, concrete transmission form, the present invention is not limited to the method for mentioning in this step, adopt influence technique effects not of which kind of method.

Second system framework

Fig. 4 is HNB-IMS system architecture schematic diagram 2 of the present invention, the signaling interface situation of each major function inter-entity of HNB system has been described, wherein, interface S402 (Uu interface), interface S404 (Iuh interface), interface S406 (IuCS interface), interface S410 (I2 interface) are identical with the interface of correspondence position in Fig. 3 with interface S412 (HGm interface).Fig. 4 and Fig. 3 difference be, interface S408 is different from the interface S308 in Fig. 3.

Interface S408, Sv interface, interface between HNB and eMSC for SRVCC, for realizing the interface switching in existing 2G/3G network between eMSC for SRVCC and SGSN, the standardization of interface operation and flow process, but message format is standardization not yet, character due to this interface, from eMSC for SRVCC, it seems, switch while occurring, HNB is exactly a SGSN, information on this interface is to transmit by the secure tunnel between HNB and HNB-GW physically, message on this interface can be used as the effective carrier form transmission of Iuh message while transmitting between HNB and HNB-GW (content that is about to IuCS interface message is encapsulated in Iuh interface message form, in the transmission of Iuh interface), also can adopt independently secure tunnel transmission of logic, concrete transmission form, the present invention is not limited to the method for mentioning in this step, adopt influence technique effects not of which kind of method.

For simplified characterization, below by eMSC for SRVCC referred to as eMSC.

Fig. 5 switches and the summary message flow chart of new technological process more, described UE-A by HNB system access IMS and session has occurred, then be switched to macrocell system, and complete and remote equipment between conversation continuity renewal process, for convenience of describing, in figure, CSCF and SCC AS are expressed as to a functional entity, this does not affect the description to scheme; Step is described below:

Step 501, UE-A and UE-B (can be also other remote equipments) the just IMS by HNB system made be connected and carry out session, the signaling paths of this session be take SCC AS as anchor point, in session establishment process, SCC AS informs sign of UE-A and/or number, the generation that this number for SCC AS (being also referred to as SCC AS number in literary composition) and/or sign identification are switched, and by the signaling paths sign of this sign (being also referred to as SCC AS sign in literary composition) index far-end session;

Media path now has two sections: the CS wireless connections CS Bearer1 between UE-A and HNB, and HNB is connected IMS Bearer1 by HNB-GW with the IMS media between UE-B.

Step 502, UE-A periodically report the signal strength measurement information of each community around to HNB by wave point (Uu), when UE-A moves to macrocellular lower time, in the cell signal strength metrical information that HNB judgement UE-A reports, the signal strength signal intensity of macrocellular reaches switching threshold, so determine session to be switched under macrocellular;

About the judgement of switching, the present invention is not limited to the method for mentioning in this step, adopts influence technique effects not of which kind of decision method.

Step 503, HNB, HNB-GW, eMSC, even also may comprise SCC AS, carries out switching flow, and UE-A is switched under macrocell system, and rear extended meeting elaborates the handoff procedure of this step;

After having switched, set up CS media and be connected CS Bearer2 (wherein comprised the wireless connections between UE-A and 2G/3G base station, and the wired connection between 2G/3G base station and eMSC) between UE-A and eMSC, CS Bearer1 is released;

Step 504, eMSC initiate the IMS conversation continuity renewal process of standard, by the renewal that the IMS media of far-end UE-B are connected that helps through of SCC AS, make IMS Bearer1 be updated to eMSC and be connected IMS Bearer2 with the IMS media between UE-B, rear extended meeting elaborates the renewal process of this step, according to the difference of the specific embodiment of this process, the correlation of step 503 and step 504 can be different;

After switching completes with renewal process, UE-A just can continue call by new media path CS Bearer2, IMSBearer2 and UE-B.

In following embodiment, between HNB and HNB-GW, set up and have secure tunnel, the information on the Iuh interface between HNB and HNB-GW all needs to transmit by this secure tunnel.

What in following embodiment mono-, two, emphasis was described is the detailed step corresponding to the step 503 of Fig. 5, HNB has been described when determining to carry out handover operation, how to complete the handoff procedure of wireless channel together with HNB-GW and eMSC, employing be the framework of the first framework embodiment or the second framework embodiment.

Embodiment mono-

In Fig. 6, corresponding to the detailed step of step 503, adopt the first system framework, after having described HNB and determining to switch, how HNB, HNB-GW and eMSC are switched to UE-A the process of macrocell system; This embodiment mono-is applicable to the static number that eMSC or HNB-GW do not obtain the conversation continuity operation of SCC AS, and when in step 501, SCC AS is not by the situation of SCC AS number notifying UE-A, as shown in Figure 6, step 601 is processes that HNB request SCC AS informs HNB by the dynamic number (being designated hereinafter simply as the dynamic number of SCC AS) of the conversation continuity operation of SCCAS to 604 descriptions.Wherein the static number of SCC AS, the dynamic number of SCC AS are all SCC AS numbers.

Concrete steps are as follows:

Step 601, the transfer request message of HNB structure HGm, request is arrived CS territory by part or all of media transfer, reINVITE message such as INVITE or the IMS of IMS, it is target that message be take the SCC AS identification information obtaining in step 501, carry media resource information, wherein partly or entirely media are designated as CS territory media, HNB is encapsulated in this message in Iuh interface message and sends to HNB-GW, such as the IMS Command message of Iuh interface, (content that is about to transfer request message is encapsulated in the IMS Command message of Iuh interface, this IMS Command message is sent to HNB-GW), in other embodiments, can also by the transfer request message of this HGm by the logic set up independently secure tunnel send to SCC AS,

Step 602, HNB-GW are transmitted to SCC AS by the transfer request message of HGm;

Step 603, SCC AS receive the transfer request message of HGm, according to the IMS process of standard, send the agreement transfer response message of HGm, such as " 183Session Progress " message of IMS, in message, carry SCC AS for the current dynamic number of SCC AS distributing that shifts;

Step 604, HNB-GW are encapsulated in the agreement transfer response message of HGm in Iuh interface message and send to HNB, for example, be encapsulated in the IMS Command message of Iuh interface;

In other embodiments, SCC AS can also by the logic set up independently secure tunnel directly the agreement transfer response message of HGm is sent to HNB;

Step 605, HNB are by initiating the switching controls message (such as Handover Notify message) of Iuh interface or the handover request message of IuCS interface be encapsulated in the switching controls message of Iuh interface to HNB-GW with the secure tunnel of HNB-GW foundation, and in this switching controls message, carry number information and/or the identification information of UE-A, the dynamic number of SCC AS that target cell information and SCC AS distribute in step 603;

Step 606, HNB-GW receive after the switching controls message of Iuh interface, extract number and/or identification information, target cell information and other information that may need of UE-A, the handover request message that generates Sv interface is sent to eMSC, such as PS to CS Handover Request message, and in this message, carry the dynamic number of SCC AS (obtaining by step 605) that SCC AS distributes in step 603;

Step 607, eMSC receive Sv interface handover request message, according to the process of standard, according to target cell information wherein, determine CS inter-office switchover flow process or the CS intra-office switching flow of employing standard, with notification target community, switch and operate and prepare it to media connection resource and the interface-free resources of eMSC;

EMSC now can setting up procedure 504 more new technological process, can not start yet.

Step 608, eMSC complete after the CS handover operation process of standard, to HNB-GW, send Sv interface switching response message, and such as PS to CS Handover response message, notice HNB-GW switching is ready to complete;

If the more new technological process of eMSC setting up procedure 504 when step 607, step 608 also can be carried out after the message of step 1005 of receiving the step 804 of Fig. 8 or the step 904 of Fig. 9 or Figure 10 again.If eMSC more new technological process of setting up procedure 504 not when step 607, can start at this moment.

Step 609, HNB-GW send the switching controls response message of Iuh interface to HNB, such as Handover Notify response message;

Step 610, HNB send to switch to UE-A by wave point (Uu) and carry out message, such as sending Handover Command message, UE-A is switched to Target cell after receiving this message, thereby use between ready media connection and eMSC, sets up the CS Bearer2 in Fig. 5.

In the change example one of embodiment mono-, eMSC or HNB-GW are by obtaining alternately the static number of the conversation continuity operation of SCC AS with home subscriber server HSS (Home Subscriber Server), or when system configuration, the static number of SCC AS is configured into eMSC or HNB-GW, handoff procedure does not need to perform step 601 to 604, only need step 605 can complete switching to 610, and do not need to carry SCC AS number in step 605 switching controls message; If be configured to the static number that HNB-GW does not obtain SCC AS, in the handover request message of step 606, to be with SCC AS number, if be configured to the static number that eMSC obtains SCC AS, in the handover request message of step 606, be not with SCC AS number.

In the change example two of embodiment mono-, if system does not configure eMSC or HNB-GW can obtain the static number of the conversation continuity operation of SCC AS, and in step 501, SCC AS is by SCC AS number notifying during to UE-A, handoff procedure does not need step 601 to 604, only need step 605 can complete switching to 610, and the SCC AS number carrying in the handover request message of step 605 switching controls message and step 606 is that in step 501, SCC AS notifies SCC AS number to UE-A to complete switching.

Embodiment bis-

In Fig. 7, corresponding to the detailed step of step 503, different from embodiment mono-is adopts second system framework, and after having described HNB and determining to switch, how HNB, HNB-GW and eMSC are switched to UE-A the process of macrocellular.Identical with enforcement one, when this embodiment bis-is applicable to system and does not configure the static number (eMSC or HNB-GW are by obtaining or static configuration with home subscriber server HSS is mutual) that eMSC or HNB-GW can obtain the conversation continuity operation of SCC AS, and in step 501, SCC AS is not by the situation of SCC AS number notifying UE-A, as shown in Figure 7, concrete steps are as follows:

Step 701 to 704 with step 601 in Fig. 6 to 604 identical, description be also the process that SCC AS informs HNB by the dynamic number of SCC AS;

Step 705, HNB by the logic set up with HNB-GW independently secure tunnel to HNB-GW, initiate the handover request message (such as PS to CS Handover Request message) of Sv interface or the handover request message of Sv interface be encapsulated in the message of Iuh interface, in the handover request message of this Sv interface, carry number information and/or the identification information of UE-A, the dynamic number of SCC AS that target cell information and SCC AS distribute in step 703;

Step 706, HNB-GW forward Sv interface handover request message to eMSC;

Step 707, eMSC receive Sv handover request message, according to the process of standard, according to target cell information wherein, determine CS inter-office switchover flow process or the CS intra-office switching flow of employing standard, with notification target community, switch and operate and prepare it to media connection resource and the interface-free resources of eMSC;

Step 708, eMSC complete after the CS handover operation process of standard, to HNB-GW, send Sv switching response message, and such as PS to CS Handover response message, notice HNB switching is ready to complete;

If the more new technological process of eMSC setting up procedure 504 when step 707, step 708 also can be carried out after the message of step 1005 of receiving the step 804 of Fig. 8 or the step 904 of Fig. 9 or Figure 10 again.If eMSC more new technological process of setting up procedure 504 not when step 707, can start at this moment.

Step 709, HNB-GW forward Sv switching response message to HNB;

Step 710, HNB send to switch to UE-A by wave point (Uu) and carry out message, such as sending Handover Command message, UE-A is switched to Target cell after receiving this message, thereby use between ready media connection and eMSC, sets up the CS Bearer2 in Fig. 5.

Similar with the description of the change example one of embodiment mono-, in the change example one of embodiment bis-, if system configuration eMSC can obtain the static number of the conversation continuity operation of SCC AS, handoff procedure does not need step 701 to 704, only need step 705 can complete switching to 710, and do not need to carry SCC AS number in the Sv interface handover request message of step 705 and step 706.

Similar with the description of the change example two of embodiment mono-, in the change example two of embodiment bis-, if system does not configure the static number that eMSC can obtain the conversation continuity operation of SCC AS, and in step 501, SCC AS is by SCC AS number notifying during to UE-A, handoff procedure does not need step 701 to 704, only need step 705 can complete switching to 710, and in the handover request message of the Sv interface of step 705 and step 706, to carry SCC AS number be that in step 501, SCC AS notifies the SCC AS number to UE-A.

What in following embodiment tri-, four, five, emphasis was described is the detailed step corresponding to the step 504 of Fig. 5, having described eMSC is learning while switching, how far-end is carried out to media and connect the process of upgrading, what adopt is the framework of the first framework embodiment or the second framework embodiment, and the changing method described in the employing above-described embodiment one of the step 503 in this embodiment or embodiment bis-.

Embodiment tri-

As shown in Figure 8, in the present embodiment, the media update method to remote equipment comprises the following steps:

Step 801, eMSC initiate IMS call request to SCC AS, such as sending INVITE (invitation) message, target is static number or the dynamic number of SCC AS, and carry number and/or the identification information of the UE-A in step 606 or 706, identification information can obtain from step 606 or 706, also can generate by number information, this message can be carried out by the arbitrary suitable time point behind step 606 or 706, also carries the media resource information (can be described as eMSC side media resource) of the media gateway of eMSC or its control in IMS call request;

Step 802, SCC AS receive IMS call request, it is that conversation continuity operates that target by this message identifies, so find the session path of UE-A, by this session path, to remote equipment, send IMS update request, such as sending reINVITE (heavily inviting) message or UPDATE (renewal) message, carry the media resource information in step 801;

Step 803, UE-B receive update request, send and upgrade response, such as sending " 200OK " message, carry the media resource information of the renewal of UE-B;

Step 804, SCC AS receive and upgrade response, send IMS call message to eMSC, such as sending " 200OK " message, carry the media resource information of the renewal of UE-B;

So far, the media connection IMS Bearer1 in UE-B renewal Fig. 5 is that UE-B connects IMS Bearer2 to the media in the Fig. 5 between eMSC.

Step 608 or 708 can be carried out after this step, and also step is irrelevant therewith.

Step 805, SCC AS send IMS and hang up the former session that message is hung up HNB, if adopt the changing method of the change example one, two of embodiment mono-or the change example one, two of embodiment bis-in handoff procedure, only need to send one and hang up message, such as sending BYE (hanging up) message, if adopt the changing method of embodiment mono-or embodiment bis-in handoff procedure, SCC AS will send two IMS and hang up message, one is the BYE message of hanging up the session of former HNB, and another is CANCEL or the BYE message of hanging up the session of step 601 or step 701 initiation;

Step 806, hang up message through HNB-GW, HNB-GW is hung up message by IMS and is encapsulated into (for example IMS Command message of Iuh interface) in Iuh interface message and sends to HNB, or in other embodiments, SCC AS by between SCC AS and HNB independently secure tunnel directly send to HNB.

Embodiment tetra-

As shown in Figure 9, different from media update method in embodiment tri-is, in order to prevent that SCC AS from carrying out to UE-B the call drop that the overlong time of media resource renewal may cause, in embodiment tetra-, at SCCAS, UE-B is carried out before media resource renewal, HNB sets up the interim conversation path of UE-A and UE-B, prevent call drop, the media update method to remote equipment in the present embodiment comprises the following steps:

Step 901, eMSC initiate IMS call request to SCC AS, such as sending INVITE (invitation) message, target is static number or the dynamic number of SCC AS, and carry number and/or the identification information of the UE-A in step 606 or 706, identification information can obtain from step 606 or 706, also can generate by number information, this message can be carried out by the arbitrary suitable time point behind step 606 or 706, also carries the media resource information of the media gateway of eMSC or its control in IMS call request;

Step 902, SCC AS receives IMS call request, it is that conversation continuity operates that target by this message identifies, so find the session path of UE-A, and on former session path, to UE-A, send the updating message of HGm, such as sending reINVITE or the UPDATE message of IMS, carry the media resource information that in the message of step 901, eMSC provides, if use enforcement one or implement two changing method, on the session path that SCC AS also can initiate in step 602 or step 702, to UE-A, send the updating message of HGm, such as sending the UPDATE message of IMS, message is carried the media resource information that in the message of step 901, eMSC provides, during message approach HNB-GW, HNB-GW by media resource Information encapsulation in Iuh interface message (such as the IMS Command message of Iuh interface) be sent to HNB, or, also can directly by the independently secure tunnel between SCC AS and HNB, be sent to HNB by SCC AS,

Step 903, HNB will send and upgrade response message by standard, such as sending " 200OK " message, message is carried the media resource information of HNB, HNB is encapsulated in (such as the IMS Command message of Iuh interface) in Iuh interface message by this renewal response message and sends to HNB-GW, by HNB-GW, send to SCC AS again, or, also can directly by the independently secure tunnel between SCC AS and HNB, be sent to SCC AS by HNB;

Step 904, SCC AS receive after the response updating message of HGm, and the IMS call request of response of step 901, such as sending " 200OK " message of IMS, is carried the media resource information of the HNB obtaining in step 903;

So far, under SCC AS auxiliary, between eMSC and HNB, set up new media and be connected IMS Bearer3.

By the switching of HNB, the IMS Bearer1 of IMS Bearer3 and former session couples together, after making to switch, UE-A can converse by the CS Bearer2 in Fig. 5 and IMS Bearer3, IMS Bearer1 and UE-B, although media path is long, kept IMS Bearer1, thereby not be used in handoff procedure, carry out and upgrade this longer operation consuming time of far-end operation, keep the very low dropped calls time, also kept very low switching time.

Step 905, with step 904 simultaneously, SCC AS provides media resource information to eMSC request, such as sending reINVITE message, is not with any media resource;

Step 906, eMSC send response message so that media resource information to be provided, and such as sending " 200OK " message, carry the media resource information that eMSC provides;

Step 907, SCC AS send updating message to UE-B on former session path, such as sending reINVITE or UPDATE message, carry the media resource information that eMSC provides;

Step 908, UE-B respond updating message, such as sending " 200OK " message, carry the media resource information of the renewal of UE-B;

Step 909, SCC AS send it back the message of answering media resource to eMSC, such as sending ACK (confirmation) message, carry the media resource information of renewal of the UE-B of acquisition;

So far, under SCC AS auxiliary, the IMS Bearer1 in Fig. 5 is updated to UE-B in Fig. 5 and the IMS Bearer2 between eMSC, and UE-A and UE-B can be conversed by the CSBearer2 in Fig. 5 and IMS Bearer2, has shortened media path.

Above step 905～909 also can be carried out by the step 1006 in Figure 10～1010.

Step 910, SCC AS sends IMS and hangs up the former session that message is hung up HNB, if adopt the change example one of embodiment mono-in handoff procedure, two or the change example one of embodiment bis-, two changing method, only need to send one and hang up message, such as sending BYE (hanging up) message, this will discharge IMSBearer3, if adopt embodiment mono-or embodiment bis-changing methods in handoff procedure, and in step 902, SCC AS sends the updating message of HGm on the session path of step 602 or step 702 initiation to UE-A, SCC AS will send two IMS and hang up message, one is the BYE message of hanging up the session of former HNB, another is CANCEL or the BYE message of hanging up the session of step 601 or step 702 initiation, while hanging up message through HNB-GW, HNB-GW is hung up message using IMS and is sent to HNB as the effective carrier of Iuh interface message, IMS Command message such as Iuh interface, or by the logic set up independently secure tunnel send to HNB.

Embodiment five

As shown in figure 10, the present embodiment is different from the update method in embodiment tetra-, by HNB-GW rather than the interim conversation path of setting up UE-A and UE-B by HNB, prevents call drop; Comprising the following steps the media update method of remote equipment in the present embodiment:

Step 1001～1003, identical with step 901～903 of Fig. 9;

Step 1004, SCC AS receive after the response updating message of HGm, and the IMS call request of response of step 1001, such as sending " 200OK " message of IMS, is carried the media resource information of the HNB obtaining in step 1003;

Step 1005, HNB send the handoff completion message of Iuh interface to HNB-GW, such as sending Handover Complete message, carry the upper former conversation media of HNB and be connected to the new media of consulting in media link address on HNB, receiving port list and corresponding step 1001～1003 and be connected to media link address and the receiving port list on eMSC, carry the media resource information of the IMSBearer1 between UE-B and HNB and the media resource information that the media between eMSC and HNB are connected IMS Bearer3.

Media link address, receiving port list and corresponding HNB that the upper new media of consulting by step 1001～1003 of HNB is connected on HNB go up media link address and the receiving port list that former conversation media is connected to far-end, and image is expressed as:

(reception) (forwarding)

Former conversation media data → HNB address and port → eMSC address and port

New session media data → HNB address and port → far-end address and port;

Switching by HNB-GW couples together the IMS Bearer1 of IMS Bearer3 and former session, the media data that mails to HNB on IMS Bearer1 is transmitted to eMSC by IMS Bearer3, the media data that mails to HNB on IMS Bearer3 is transmitted to far-end by IMS Bearer1, this switching/forwarding is that the address port mapping table by obtaining in step 1005 is realized, after this makes to switch, UE-A can be by CS Bearer2 and IMS Bearer3 in Fig. 5, IMS Bearer1 and UE-B call, although media path is long, but kept IMS Bearer1, thereby not be used in handoff procedure, carry out and upgrade this longer operation consuming time of far-end operation, kept the very low dropped calls time, also kept very low switching time.

Step 1006, with step 1004 simultaneously, SCC AS provides media resource information to far-end request on former session path, such as sending reINVITE message, is not with any media resource;

Step 1007, far-end send response message so that media resource information to be provided, and such as sending " 200OK " message, carry the media resource information that far-end UE-B provides;

Step 1008, SCC AS send updating message to eMSC, such as sending reINVITE or UPDATE message, carry the media resource information that far-end UE-B provides;

Step 1009, eMSC respond updating message, such as sending " 200OK " message, carry the media resource information of the renewal of eMSC;

Step 1010, SCC AS send it back the message of answering media resource to far-end on former session path, such as sending ACK (confirmation) message, carry the media resource information of renewal of the eMSC of acquisition;

Above step 1006～1010 also can be carried out by the step 905 in Figure 10～909.

Step 1011, SCC AS sends IMS and hangs up the former session that message is hung up HNB, if adopt one of embodiment mono-in handoff procedure, two become one of example or embodiment bis-, two become routine changing method, only need to send one and hang up message, such as sending BYE (hanging up) message, this will discharge IMSBearer3, if adopt embodiment mono-or embodiment bis-changing methods in handoff procedure, and in step 1002, SCC AS sends the updating message of HGm on the session path of step 602 or step 702 initiation to UE-A, SCC AS will send two IMS and hang up message, one is the BYE message of hanging up the session of former HNB, another is CANCEL or the BYE message of hanging up the session of step 601 or step 701 initiation, while hanging up message through HNB-GW, HNB-GW is hung up message using IMS and is sent to HNB as the effective carrier of Iuh interface message, IMS Command message such as Iuh interface, or by the logic set up independently secure tunnel send to HNB.

Certainly; be more than some concrete implementation methods of the present invention; the present invention is also not only confined on above-mentioned concrete grammar; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. a method for switching terminal from home node B to macrocell system, comprising:

When described terminal need be switched to macrocell system, described HNB by and femto gateway HNB-GW between control signal interface be that Iuh interface sends switching controls message to described HNB-GW, described HNB-GW is by controlling and strengthen mobile switching centre with single mode voice continuity

Data field session between eMSC for SRVCC is that Sv interface sends handover request message to described eMSC for SRVCC to circuit domain session switching control signaling interface;

Described eMSC for SRVCC prepares after resource for switching, by described Sv interface, to described HNB-GW, return to switching response message, described HNB-GW sends switching controls response message by described Iuh interface to described HNB, described HNB notifies described terminal to carry out after switching, sets up described terminal and is connected M2 with the circuit switching between described eMSC for SRVCC.

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

When the switching to macrocell system is carried out or after completing, described eMSC for SRVCC carries out media renewal to described remote equipment, specifically comprises: described eMSC for SRVCC will

EMSC for SRVCC side media resource information is sent to business continuance server S CC AS; Described SCC AS sends the IMS update request of carrying described eMSC for SRVCC side media resource information to described remote equipment, described remote equipment is carried out to media renewal.

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

At described eMSC for SRVCC, described remote equipment is carried out before media renewal,

Described eMSC for SRVCC is sent to described HNB by business continuance server S CC AS by eMSC for SRVCC side media resource information, and described HNB is sent to described eMSC for SRVCC by described SCC AS by HNB media resource information; Between described HNB and described eMSC for SRVCC, set up IMS and be connected M3; Described HNB couples together described M3 and described M1 at described HNB place, after described terminal completes to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 is connected M1 formation Temporary access with IMS and carry out session, until the media of described remote equipment have been upgraded.

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

Described HNB sends handoff completion message to described HNB-GW by described Iuh interface, and carry described IMS and connect the media resource information of M1 and the media resource information that described IMS connects M3, described HNB-GW couples together described connection M3 at described HNB-GW place with the described M1 of connection, after described terminal completes to the switching of macrocell system, by circuit switching, be connected M2, IMS with described remote equipment and connect M3 is connected M1 formation Temporary access with IMS and carry out session, until the media of described remote equipment have been upgraded.

5. a terminal switching system, comprise the Home eNodeB HNB system based on multimedia subsystem, IMS and set up the terminal of IMS session by the Home eNodeB HNB system based on multimedia subsystem, IMS and remote equipment, it is characterized in that, also comprise: it is eMSC for SRVCC that single mode voice continuity is controlled enhancing mobile switching centre;

6. terminal switching system as claimed in claim 5, is characterized in that,

7. terminal switching system as claimed in claim 6, is characterized in that,

8. terminal switching system as claimed in claim 6, is characterized in that,

9. a method for switching terminal from home node B to macrocell system, comprising:

10. method as claimed in claim 9, is characterized in that,

11. methods as claimed in claim 10, is characterized in that,

12. methods as claimed in claim 10, is characterized in that,

13. 1 kinds of terminal switching systems, comprise the Home eNodeB HNB system based on multimedia subsystem, IMS and set up the terminal of IMS session by the Home eNodeB HNB system based on multimedia subsystem, IMS and remote equipment, it is characterized in that, also comprise: it is eMSC for SRVCC that single mode voice continuity is controlled enhancing mobile switching centre;

Described HNB, for when described terminal need be switched to macrocell system, by with described

Data field session between eMSC for SRVCC sends handover request message to described eMSC for SRVCC to circuit domain session switching control signaling interface Sv interface; Also, for after receiving the switching response message of described eMSC for SRVCC, notify described terminal to carry out and switch;

14. terminal switching systems as claimed in claim 13, is characterized in that,

15. terminal switching systems as claimed in claim 14, is characterized in that,

16. terminal switching systems as claimed in claim 14, is characterized in that,