CN101848509A

CN101848509A - Method and system for switching terminal from home node B to macrocell system

Info

Publication number: CN101848509A
Application number: CN200910128494A
Authority: CN
Inventors: 谢振华; 郝振武
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-03-23
Filing date: 2009-03-23
Publication date: 2010-09-29
Anticipated expiration: 2029-03-23
Also published as: CN101848509B

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, it is deployed in the place that macrocellular signal such as building is difficult to arrive and realizes that signal covers.

In the HNB framework, packet switch (PS:Packet Switch) network that HNB inserts circuit switching (CS:Circuit Switch) network of 2G/3G and 2G/3G by femto gateway (HNB-GW:Home NodeBGateway) is to realize business, and HNB and HNB-GW can be described as the HNB subsystem.If HNB also supports to insert 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 (promptly based on IMS family base station system), thereby also can provide the miscellaneous service service for the user 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 also is a kind of IP-based network framework that is proposed by 3GPP, has made up one opening and service environment flexibly, and supporting multimedia application can provide abundant multimedia service for the user.When subscriber equipment (User Equipment, be called for short UE) under the HNB-IMS subsystem during access network, HNB can insert the IMS network with it by HNB-GW, provide professional by the IMS network, exhales, exhales eventually etc. such as rising.When the user has session under it, move to then under the macrocellular of 2G/3G, thereby when switching, the HNB-IMS subsystem to be realized not interrupting of user conversation in this process.From the angle of contrast, the 2G/3G network system can be described as macrocell system.

In the IMS business system, key-course separates with operation layer, and key-course does not provide concrete business, and functions such as necessary triggering, route, charging only are provided to operation layer.Professional triggering and controlled function are CSCF (Call Session Control Function in the key-course, be called for short CSCF, be divided into that to act on behalf of Proxy be three types of P-CSCF, inquiry Interrogating I-CSCF and service Serving S-CSCF, wherein the type of I-CSCF is optional, that take the main responsibility is S-CSCF) finish, 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 an independent entity, also may reside among the S-CSCF.Key-course (S-CSCF) calls the business on the AS according to user's professional triggering of CAMEL-Subscription-Information control, realizes business function.In the service switchover of IMS, or cry in the business continuance business, business continuance AS (Service Continuity Control AS, abbreviation SCC AS) signaling paths of responsible grappling session, be referred to as the anchor point of signaling paths, make when switching, though UE to the signaling paths of SCC AS variation has taken place, 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 under the situation that HNB inserts, 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 filling with oblique line among the figure is as signal), and by this tunnel, HNB sends the 2G/3G signaling to the 2G/3G network, transmission 2G/3G medium; (dotted portion is represented signaling paths among the figure with transmission IMS medium to send the IMS signaling to the IMS network, entity thick line part presentation medium path), specifically be to connect 2G/3G network or IMS network, determine by HNB, in general, HNB uses the IMS network to realize communication, only at UE when the macrocellular in the CS territory of 2G/3G network switches to HNB and comes, HNB just uses the 2G/3G network.HNB is by interworking function (the Interworking Function of 2G/3G network, be called for short IWF) be connected with the 2G/3G network, IWF is exactly a MSC (Mobile Switch Center basically, mobile switching centre, be called for short MSC) server, but not exclusively be equal to MSC Server, this IWF may have some and the mutual ability in IMS territory, is used for UE and switches to macrocell system from the IMS territory.

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, the Iuh interface, after HNB and HNB-GW set up secure tunnel, the Iuh interface message was transmitted on this secure tunnel, made HNB and HNB-GW transmit the control signaling mutually; Still undefined flow process of this interface and message format;

Interface S206, the IuCS interface, the interface between HNB-GW and IWF is the interface between base station and MSC Server in the 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, then IWF is indirect and IMS network interaction by the 2G/3G network;

Interface S210, the HGm interface, HNB directly and the interface of IMS network interaction, be UE and internetwork interface in the 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 the Iuh interface protocol is transmitted as underlying protocol, the content that is about to the HGm interface message is encapsulated in the Iuh interface message form, transmits at the Iuh interface.

Generally in handoff procedure, require MSC on media path, it seems from MSC, the base station is connected to near-end to the medium of MSC, opposite side is a far-end, and MSC finishes handover operation after receiving the handoff request of base station, switch finish after, 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 is connected with the IMS that passes through the IMS network that remote equipment is set up by the HNB system carries out session, the MSC of IWF simulation is connected without any medium with HNB system and IMS system, if finish switching from HNB to the macrocell system by IWF, need 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) be not to use the IuCS interface to realize that PS territory session is to the switching of CS territory session, how to use the framework and the component devices (mainly being to use existing eMSC) of original system to finish switching, do not provide solution in the prior art.

Summary of the invention

Technical problem to be solved by this invention provides 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 the IMS session by Home eNodeB HNB system and remote equipment based on multimedia subsystem, IMS, and the connection that this session is set up comprises that described Home eNodeB HNB is connected M1 with IMS medium between described remote equipment; When described terminal need switch to macrocell system, described HNB by and femto gateway HNB-GW between the control signaling interface be that the Iuh interface sends switching controls message to described HNB-GW, described HNB-GW by and the control of single mode voice continuity to strengthen mobile switching centre be that data field session between eMSC for SRVCC is that Sv interface transmission handoff request message is to described eMSC for SRVCC to circuit domain session switching control signaling interface; Described eMSC forSRVCC is for after switching the preparation resource, return switching response message by described Sv interface to described HNB-GW, described HNB-GW sends the switching controls response message by described Iuh interface to described HNB, after described HNB notifies described terminal to carry out to switch, set up described terminal and be connected M2 with circuit switching between the described eMSC forSRVCC.

Further, said method also has following characteristics:

When the switching of macrocell system is carried out or after finishing, described eMSC for SRVCC carries out medium to described remote equipment to be upgraded, and specifically comprise: described eMSC for SRVCC is sent to business continuance server S CC AS with 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 medium upgrade.

Further, said method also has following characteristics:

Described eMSC for SRVCC carries out the medium renewal to described remote equipment before, described eMSCfor SRVCC is sent to described HNB by business continuance server S CC AS with eMSC for SRVCC side media resource information, and described HNB is sent to described eMSC for SRVCC by described SCC AS with HNB media resource information; Set up IMS between described HNB and the described eMSC for SRVCC and be connected M3; Described HNB couples together described M3 and described M1 at described HNB place, after described terminal is finished to the switching of macrocell system, be connected M2, IMS with described remote equipment by circuit switching and connect M3 and is connected the interim path that M1 constitutes with IMS and carries out session, finish up to medium renewal to described remote equipment.

Further, said method also has following characteristics:

Described eMSC for SRVCC carried out the medium renewal to described remote equipment before, described HNB consulted 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 is finished to the switching of macrocell system, be connected M2, IMS with described remote equipment by circuit switching and connect M3 and is connected the interim path that M1 constitutes with IMS and carries out session, finish up to medium renewal to described remote equipment.

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

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

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

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

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

Described eMSC for SRVCC also is used for described remote equipment being carried out medium upgrading when the switching of macrocell system is carried out or after finishing, and eMSC for SRVCC side media resource information is sent to business continuance server S CC AS;

Described SCC AS is used for sending the IMS update request of carrying described eMSC for SRVCC side media resource information to described remote equipment, described remote equipment is carried out medium upgrade.

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

Described HNB also is used for by described SCC AS HNB media resource information being sent to described eMSC for SRVCC; Also be used 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, be connected M2, IMS with described remote equipment by circuit switching after constituting described terminal and finishing and connect M3 and be connected the interim path that M1 carries out session with IMS to the switching of macrocell system.

Described eMSC for SRVCC also is used for described remote equipment is carried out consulting to set up IMS with described HNB and being connected M3 before medium upgrade;

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

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

When described terminal need switch 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 handoff request message to described eMSC for SRVCC to circuit domain session switching control signaling interface Sv interface;

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

Further, said method also has following characteristics:

Described eMSC for SRVCC carried out the medium renewal to described remote equipment before, described HNB consulted to set up IMS with described eMSC for SRVCC and is connected M3;

Described HNB is that the Iuh interface sends handoff completion message to described HNB-GW by the control signaling 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 is finished to the switching of macrocell system, be connected M2 with described remote equipment by circuit switching, IMS connection M3 is connected the M1 formation with IMS interim path carries out session, upgrades up to the medium to described remote equipment and finishes.

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

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

Described HNB, also being used for by the control signaling interface between femto gateway HNB-GW is that the Iuh interface sends handoff completion message to described 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 control to strengthen mobile switching centre (eMSC for SRVCC:Enhanced MSC for Single Radio VoiceContinuity Control) and finish the switching of terminal from home node B, improve system compatibility to macrocell system as auxiliary magnet.

Description of drawings

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

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

Fig. 3 is a HNB-IMS system architecture schematic diagram 1 among the embodiment

Fig. 4 is a HNB-IMS system architecture schematic diagram 2 among the embodiment;

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

Fig. 6 is the flow chart of embodiment one;

Fig. 7 is the flow chart of embodiment two;

Fig. 8 is the flow chart of embodiment three;

Fig. 9 is the flow chart of embodiment four;

Figure 10 is the flow chart of embodiment five.

Embodiment

Describe the present invention below in conjunction with drawings and Examples.The method of " 2G/3G " expression present embodiment is applicable to CS territory or the PS territory in 2G or the 3G system in following embodiment and the accompanying drawing.

First system architecture

Fig. 3 is a 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), after HNB and HNB-GW set up secure tunnel, the Iuh interface message was transmitted on this secure tunnel, made HNB and HNB-GW transmit the control signaling mutually;

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

Because the 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 among the use eMSC for SRVCC.

Interface S308, Sv interface (being the switching controls interface of packet domain session) to the circuit domain session, interface between HNB-GW and eMSC for SRVCC, be the interface of realizing between eMSC forSRVCC and SGSN in the existing 2G/3G network switching, the standardization of interface operation and flow process, but message format not standardization as yet, because the character of this interface, it seems that from eMSC for SRVCC switch when taking place, 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, then eMSC for SRVCC is indirect and IMS network interaction by the 2G/3G network;

Interface S312, the HGm interface, HNB directly and the interface of IMS network interaction, be UE and internetwork interface in the 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 the Iuh interface protocol is transmitted as underlying protocol, the content that is about to the HGm interface message is encapsulated in the Iuh interface message form, in the transmission of Iuh interface, and concrete transmission form, the present invention is not limited to the method mentioned in this step, adopts influence technique effects not of which kind of method.

Second system architecture

Fig. 4 is a 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 among Fig. 3 with interface S412 (HGm interface).Fig. 4 and Fig. 3 difference are that interface S408 is different from the interface S308 among Fig. 3.

Interface S408, the Sv interface, interface between HNB and eMSC for SRVCC, be the interface of realizing between eMSC for SRVCC and SGSN in the existing 2G/3G network switching, the standardization of interface operation and flow process, but message format is not standardization as yet, because the character of this interface, it seems from eMSC for SRVCC, switch when taking place, 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 when transmitting between HNB and HNB-GW (content that is about to the IuCS interface message is encapsulated in the 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 mentioned in this step, adopts influence technique effects not of which kind of method.

In order to simplify description, below abbreviate eMSC for SRVCC as eMSC.

Fig. 5 switches and the summary message flow chart of new technological process more, having described UE-A inserts IMS and session takes place by the HNB system, then switch to macrocell system, and finish and remote equipment between the conversation continuity renewal process, describe for convenient, among the figure CSCF and SCC AS are expressed as a functional entity, this does not influence the description to scheme; Step is described below:

The IMS that step 501, UE-A and UE-B (also can be other remote equipments) just setting up by the HNB system is connected and carries out session, the signaling paths of this session is an anchor point with SCC AS, session is set up in the process, SCC AS informs sign of UE-A and/or number, SCC AS discerns the generation of switching with this number (also being referred to as SCC AS number in the literary composition) and/or sign, and identifies by the signaling paths of this sign (also being referred to as SCC AS sign in the literary composition) index far-end session;

The media path of this moment has two sections: the CS wireless connections CS Bearer1 between UE-A and the HNB, and HNB is connected IMS Bearer1 by HNB-GW with IMS medium between the UE-B.

Step 502, UE-A periodically report the signal strength measurement information of each sub-district on every side to HNB by wave point (Uu), when UE-A moves to macrocellular following 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 decision switches to session under the macrocellular;

About the judgement of switching, the present invention is not limited to the method mentioned 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, carry out switching flow, UE-A is switched under the macrocell system, back extended meeting is done the handoff procedure of this step and is elaborated;

Switch finish after, set up the CS medium between UE-A and eMSC and be connected CS Bearer2 (wherein comprised the wireless connections between UE-A and the 2G/3G base station, reached the wired connection between 2G/3G base station and the eMSC), CS Bearer1 is released;

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

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

Among the following embodiment, establish secure tunnel between HNB and HNB-GW, the information on the Iuh interface between HNB and HNB-GW all need be by this secure tunnel transmission.

Emphasis is described among the following embodiment one, two is detailed step corresponding to the step 503 of Fig. 5, HNB has been described when handover operation is carried out in decision, how finish the handoff procedure of wireless channel with HNB-GW and eMSC, employing be the framework of the first framework embodiment or the second framework embodiment.

Embodiment one

Corresponding to the detailed step of step 503, adopt first system architecture among Fig. 6, after having described HNB decision and switching, how HNB, HNB-GW and eMSC switch to UE-A the process of macrocell system; This embodiment one is applicable to that eMSC or HNB-GW do not obtain the static number of the conversation continuity operation of SCC AS, and when SCC AS is not with the situation of SCC AS number notifying UE-A in the step 501, as shown in Figure 6, what describe is the process that HNB request SCC AS informs HNB with the dynamic number (being designated hereinafter simply as the dynamic number of SCC AS) of the conversation continuity operation of SCCAS to step 601 to 604.Wherein the static number of SCC AS, the dynamic number of SCC AS all are SCC AS numbers.

Concrete steps are as follows:

Step 601, the transfer request message of HNB structure HGm, request is arrived the CS territory with part or all of media transfer, reINVITE message such as INVITE or the IMS of IMS, message is target with the SCC AS identification information that obtains in the step 501, carry media resource information, wherein partly or entirely medium are designated as CS territory medium, HNB is encapsulated in this message in the Iuh interface message and sends to HNB-GW, (content that is about to transfer request message is encapsulated in the IMS Command message of Iuh interface such as the IMS Command message of Iuh interface, this IMS Command message is sent to HNB-GW), in other embodiments, can also with 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 with the transfer request message of HGm;

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

Step 604, HNB-GW are encapsulated in the agreement transfer response message of HGm in the Iuh interface message and send to HNB, for example are 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 initiated the switching controls message (such as Handover Notify message) of Iuh interface or the handoff request message of IuCS interface are encapsulated in the switching controls message of Iuh interface to HNB-GW by the secure tunnel set up with HNB-GW, 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;

After step 606, HNB-GW receive 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 handoff request message that generates the 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) that SCC AS distributes in step 603 by step 605;

Step 607, eMSC receive Sv interface handoff request message, process according to standard, CS inter-office switchover flow process according to wherein target cell information decision employing standard still be a CS intra-office switching flow, with the switch operation and prepare medium connection resource and the interface-free resources that it arrives eMSC of notification target sub-district;

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

After step 608, eMSC finish the CS handover operation process of standard, send Sv interface switching response message to HNB-GW, 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, then step 608 also can be carried out after the message of the step 1005 of the step 904 of the step 804 of receiving Fig. 8 or Fig. 9 or Figure 10 again.If eMSC more new technological process of setting up procedure 504 not when step 607 then 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 switches to Target cell after receiving this message, thereby uses the CS Bearer2 that sets up between ready medium connection and eMSC among Fig. 5.

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

In the change example two of embodiment one, if system does not dispose eMSC or HNB-GW can obtain the static number of the conversation continuity operation of SCC AS, and when SCC AS gives UE-A with SCC AS number notifying in the step 501, handoff procedure does not need step 601 to 604, only need step 605 can finish switching to 610, and the SCC AS number that carries in the handoff request message of step 605 switching controls message and step 606 is that SCC AS is notified to the SCC AS number of UE-A to finish switching in the step 501.

Embodiment two

Corresponding to the detailed step of step 503, different with embodiment one is to adopt second system architecture among Fig. 7, and after having described the HNB decision and switching, how HNB, HNB-GW and eMSC switch to UE-A the process of macrocellular.Identical with enforcement one, when the system that is applicable to this embodiment two does not dispose 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 SCC AS is not with the situation of SCC AS number notifying UE-A in the step 501, as shown in Figure 7, concrete steps are as follows:

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

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

Step 706, HNB-GW transmit Sv interface handoff request message to eMSC;

Step 707, eMSC receive Sv handoff request message, process according to standard, CS inter-office switchover flow process according to wherein target cell information decision employing standard still be a CS intra-office switching flow, with the switch operation and prepare medium connection resource and the interface-free resources that it arrives eMSC of notification target sub-district;

After step 708, eMSC finish the CS handover operation process of standard, send the Sv switching response message to HNB-GW, 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, then step 708 also can be carried out after the message of the step 1005 of the step 904 of the step 804 of receiving Fig. 8 or Fig. 9 or Figure 10 again.If eMSC more new technological process of setting up procedure 504 not when step 707 then can start at this moment.

Step 709, HNB-GW transmit the 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 switches to Target cell after receiving this message, thereby uses the CS Bearer2 that sets up between ready medium connection and eMSC among Fig. 5.

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

Similar with the description of the change example two of embodiment one, in the change example two of embodiment two, if system does not dispose the static number that eMSC can obtain the conversation continuity operation of SCC AS, and when SCC AS gives UE-A with SCC AS number notifying in the step 501, handoff procedure does not need step 701 to 704, only need step 705 can finish switching to 710, and to carry SCC AS number in the handoff request message of the Sv interface of step 705 and step 706 be the SCC AS number that SCC AS is notified to UE-A in the step 501.

Emphasis is described among the following embodiment three, four, five is detailed step corresponding to the step 504 of Fig. 5, having described eMSC is learning when switching, how far-end is carried out medium and connect the process of upgrading, what adopt is the framework of the first framework embodiment or the second framework embodiment, and the step 503 among this embodiment adopts the foregoing description one or embodiment two described changing methods.

Embodiment three

As shown in Figure 8, the medium update method to remote equipment may further comprise the steps in the present embodiment:

Step 801, eMSC initiate the 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 the IMS call request;

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

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

So far, the medium connection IMS Bearer1 among UE-B renewal Fig. 5 is that UE-B connects IMS Bearer2 to the medium among 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 the changing method of the change example one, two of the change example one, two of employing embodiment one or embodiment two in the handoff procedure, then only need to send one and hang up message, such as sending BYE (hanging up) message, if adopt the changing method of embodiment one or embodiment two in the handoff procedure, then 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 a 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 with IMS and is encapsulated into that (for example IMS Command message of Iuh interface) sends to HNB in the Iuh interface message, perhaps in other embodiments, SCC AS by between SCC AS and the HNB independently secure tunnel directly send to HNB.

Embodiment four

As shown in Figure 9, different with medium update method among the embodiment three is, in order to prevent that SCC AS from carrying out the call drop that overlong time that media resource upgrades may cause to UE-B, UE-B is carried out before media resource upgrades at SCCAS among the embodiment four, HNB sets up the interim conversation path of UE-A and UE-B, prevent call drop, the medium update method to remote equipment in the present embodiment may further comprise the steps:

Step 901, eMSC initiate the 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 the IMS call request;

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

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

After step 904, SCC AS received the response updating message of HGm, the IMS call request of response of step 901 such as " 200 OK " message that sends IMS, was carried the media resource information of the HNB that obtains in the step 903;

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

Switching by HNB, the IMS Bearer1 of IMS Bearer3 and former session couples together, behind feasible the switching, UE-A can be by the CS Bearer2 among Fig. 5 and IMS Bearer3, IMS Bearer1 and UE-B conversation, though media path is long, kept IMS Bearer1, upgrade this long operation consuming time of far-end operation thereby not be used in to carry out in the handoff procedure, promptly 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 the 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 " 200 OK " 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 " 200 OK " 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 (affirmation) message, carry the media resource information of renewal of the UE-B of acquisition;

So far, SCC AS auxiliary down, the IMS Bearer1 among Fig. 5 is updated to UE-B among Fig. 5 and the IMS Bearer2 between eMSC, makes UE-A and UE-B to converse by CSBearer2 among Fig. 5 and IMS Bearer2, shorten media path.

Above step 905～909 also can be carried out by the step 1006 among 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 one in the handoff procedure, two or the change example one of embodiment two, two changing method, then only need to send one and hang up message, such as sending BYE (hanging up) message, this will discharge IMSBearer3, if adopt embodiment one or embodiment two changing methods in the handoff procedure, and SCC AS sends the updating message of HGm in the step 902 to UE-A on the session path of step 602 or step 702 initiation, then 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 a BYE message of hanging up the session of step 601 or step 702 initiation, when hanging up message through HNB-GW, HNB-GW is hung up message with IMS and is sent to HNB as the effective carrier of Iuh interface message, such as the IMS Command message of Iuh interface, or by the logic set up independently secure tunnel send to HNB.

Embodiment five

As shown in figure 10, what present embodiment was different with update method among the embodiment four is, by HNB-GW rather than the interim conversation path of setting up UE-A and UE-B by HNB, prevents call drop; May further comprise the steps the medium update method of remote equipment in the present embodiment:

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

After step 1004, SCC AS received the response updating message of HGm, the IMS call request of response of step 1001 such as " 200 OK " message that sends IMS, was carried the media resource information of the HNB that obtains in the step 1003;

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

Medium link address, receiving port tabulation and corresponding HNB that the last new media of consulting by step 1001～1003 of HNB is connected on the HNB go up medium link address and the receiving port tabulation that former conversation media is connected 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 the IMS Bearer1 is transmitted to eMSC by IMS Bearer3, the media data that mails to HNB on the IMS Bearer3 is transmitted to far-end by IMS Bearer1, this switching/forwarding is to realize by the address port mapping table that obtains in the step 1005, after this makes and switches, UE-A can be by CS Bearer2 and the IMS Bearer3 among Fig. 5, IMS Bearer1 and UE-B conversation, though media path is long, but kept IMS Bearer1, thereby not be used in to carry out in the handoff procedure and upgrade this long operation consuming time of far-end operation, promptly keep 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 the far-end request on former session path, such as sending reINVITE message, be not with any media resource;

Step 1007, far-end send response message so that media resource information to be provided, and such as sending " 200 OK " 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 " 200 OK " 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 (affirmation) 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 among 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 one in the handoff procedure, two become one of example or embodiment two, two become the changing method of example, then only need to send one and hang up message, such as sending BYE (hanging up) message, this will discharge IMSBearer3, if adopt embodiment one or embodiment two changing methods in the handoff procedure, and SCC AS sends the updating message of HGm in the step 1002 to UE-A on the session path of step 602 or step 702 initiation, then 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 a BYE message of hanging up the session of step 601 or step 701 initiation, when hanging up message through HNB-GW, HNB-GW is hung up message with IMS and is sent to HNB as the effective carrier of Iuh interface message, such as the IMS Command message of Iuh interface, or by the logic set up independently secure tunnel send to HNB.

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

Claims

1. the method for a switching terminal from home node B to macrocell system comprises:

When described terminal need switch to macrocell system, described HNB by and femto gateway HNB-GW between the control signaling interface be that the Iuh interface sends switching controls message to described HNB-GW, described HNB-GW by and the control of single mode voice continuity to strengthen mobile switching centre be that data field session between eMSC forSRVCC is that Sv interface transmission handoff request message is to described eMSC for SRVCC to circuit domain session switching control signaling interface;

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

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

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

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 is finished to the switching of macrocell system, be connected M2, IMS with described remote equipment by circuit switching and connect M3 and is connected the interim path that M1 constitutes with IMS and carries out session, finish up to medium renewal to described remote equipment.

5. terminal switching system, comprise based on the Home eNodeB HNB system of multimedia subsystem, IMS with by Home eNodeB HNB system and remote equipment and set up the terminal of IMS session based on multimedia subsystem, IMS, it is characterized in that, also comprise: it is eMSC for SRVCC that the control of single mode voice continuity strengthens 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. the method for a switching terminal from home node B to macrocell system comprises:

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

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

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

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

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

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

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