CN102625397A - Handover method and system thereof - Google Patents

Abstract

Disclosed is a handover method, comprising: after a source access gateway (AG) receives a handover request, notifying a handover proxy function entity (HOPF) to carry out heterogeneous network handover processing; the HOPF notifying a mobile switching center (MSC) to prepare handover resources and establishing bearing needed for the handover; and the source AG notifying a radio network controller (RNC) to carry out handover. Besides, after a source MSC receives the handover request, the HOPF is notified to make preparation for the handover; the HOPF notifies a target AG to prepare the handover resources and establishes an IP bearer; and the HOPF notifies the source MSC that the handover preparation is completed and the source MSC notifies the RNC to carry out the handover. Meanwhile, disclosed is a handover system for realizing the method. According to the invention, a handover message flow is simplified; compared with the prior art, the technology employed in the invention enables efficiency of the system handover to be improved; and moreover, users will not notice any abnormity of service handover and there is no handover vibration, thereby improving the user experience effect of the service.

Description

Changing method and system

Technical field

The present invention relates to the handoff technique in IP Multimedia System (IMS, the IP Multimedia Subsystem) network architecture, relate in particular to a kind of changing method and switched system based on IMS centralized traffic (ICS, IMS Centralized Service).

Background technology

From the evolution and development of communication network, the development of the core net network architecture demonstrates two main trend: the one, and the IP of network (Internet Protocol) changes, and the 2nd, the fusion of diverse network.Therefore following core net will not be further divided into circuit switching (CS; Circuit Switched) territory, packet switching (PS; Packet Switching) multiple core net such as territory and IMS; And will be an IP-based unified service control system, all business (comprising speech business, supplementary service and value-added service etc.) are all realized by this unified service control system.

IP-based unified service control system (back literary composition is called unified IP kernel heart net) has two characteristics, and the one, business realization such as voice adopt session initiation protocol (SIP, Session Initiation Protocol); The 2nd, this service control system and access technology are irrelevant, and promptly the user can insert also and can insert through CS through PS.The PS access way here refers to the user can be linked into core net through GPRS (GPRS, General Packet Radio Service), WLAN packet networks such as (WLAN, Wireless Local Area Network).And referring to the user, the CS access way is linked into core net through circuit domain Radio Access Network such as base station sub-system (BSS, Base Station Subsystem) or RNS equipment such as (RNS, Radio Network Subsystem).No matter be to adopt which kind of access way, business is all provided by above-mentioned unified IP kernel heart net.

Fig. 1 is linked into the application scenarios sketch map of unified IP kernel heart net for adopting the CS access way; As shown in Figure 1; Subscriber equipment (UE; User Equipment) 101 be linked in the unified IP kernel heart net 104 through circuit domain access network (like BSS or RNS) 102 and signaling adaptation device 103, signaling adaptation device 103 plays necessary signaling transformation, and all business are provided by unified IP kernel heart net 104.

Fig. 2 is for the Organization Chart of the unified IP kernel heart net of CS access, and is as shown in Figure 2, and the framework that CS inserts unified IP kernel heart net comprises following network element: subscriber equipment (UE; User Equipment) 201, base station controller (BSC, Base Station Controller) or radio network controller (RNC; Radio Network Controller) 202, IAD (AG, Access Gateway) 203; Integrated service controlled function entity (ISCF; Integrated Service Control Function) 204, wherein, BSC and RNC202 comprise that the user who is used to realize the CS territory inserts and functions such as the management of Radio Resource and control.Interface between BSC and the AG203 adopts Base Station Subsystem Application Part (BSSAP; Base Station System Application Part) signaling; Interface between RNC and the AG203 adopts Radio Access Network Application Part (RANAP; Radio Access Network Application Part) signaling, BSSAP and RANAP signaling are referred to as the CS access signaling.Interface between AG203 and the equipment 202 adopts the CS access signaling, and the interface between the ISCF adopts Session Initiation Protocol, the translation function between AG203 realization CS access signaling and the sip message.In addition, AG also possesses the carrying of setting up the medium face, realizes continuing and function such as processing of Media Stream.ISCF204 realizes functions such as mobile management, professional route, calling control, professional control, storage.It can be realized by one or more functional entitys.

User equipment (UE) 201 is linked into AG 203 through BSC or RNC; AG203 receives and is converted into the SIP signaling after the CS access signaling that BSC or RNC send and sends to ISCF204; This moment, AG was equivalent to serve as the user agent; Replace subscriber equipment 201 to be linked into ISCF204, carry out professional route and call out control by ISCF204, thus user UE201 can with the remote subscriber words that work of going forward side by side that connect.

It more than is the framework description that CS is linked into unified IP kernel heart net.The evolution of network must need long time with development; Therefore; The above-mentioned IP core net can not accomplished in the short-term deployed, and the CS network is as main and sophisticated service platform at present, also long-term existence over a period to come; Therefore will inevitably have CS network and the network coexisted situation of above-mentioned background in one period, this section in period the user both can insert the CS network and also can insert the above-mentioned IP network.

When CS user in communication process during from the above-mentioned IP netsurfing to the traditional C network or from the traditional C netsurfing to the above-mentioned IP network; Also change with regard to the access channel that means the user, realize service switchover between this two heterogeneous networks for not interrupt communication needs core net this moment.

Service switchover in the above-mentioned IP network; The SIP signaling is all adopted in the foundation mutual and the medium face of its signaling plane; And the switching in the CS network, MAP (MAP, Mobile Application Part) signaling is adopted in its transmission of switching message; The medium face is the User Part (ISUP that adopts ISDN; ISDN User Part) or with calling control (BICC, Bearer Independent Call Control) signaling of bearer independent set up the interoffice carrying, the realization agreement and the method for the service switchover of two networks are completely different; Situation about therefore switching between above-mentioned IP network and CS network for the user need rethink that the transmission of switching message and the medium face after the switching carry problems such as foundation.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of changing method and switched system, and it is compatible to the communication service of other mobile network users to realize that ICS strengthens network.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of changing method comprises:

After source AG received handoff request, notice was switched agent functionality entity (HOPF, Handover Proxy Function) and is carried out the heterogeneous network hand-off process;

Said HOPF notification target mobile switching centre (MSC, Mobile Switching Center) prepares switchable resource and sets up to switch required carrying;

Said source AG notification source radio network controller (RNC, Radio Network Controller) switches.

Preferably, said notice HOPF carries out the heterogeneous network hand-off process and is specially:

Said source AG judge current switch to heterogeneous network and switch after, the address that obtains said HOPF notifies said HOPF to carry out the heterogeneous network hand-off process through sip message.

Preferably, carry the relevant parameter and/or the switching sign of switching in the said sip message.

Preferably, carry the relevant parameter of switching and/or switch sign and be specially in the said sip message:

Carry the relevant parameter that switches in the message body of said sip message and/or switch sign.

Preferably, the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

Preferably, carry the relevant parameter of switching and/or switch sign and be specially in the said sip message:

Carry in the message header of said sip message and switch sign.

Preferably, said sip message is a transfer request REFER message, and/or, the calling invitation INVITE.

Preferably, carrying the switching sign in the message header of said sip message is specially:

For said REFER message, said switching sign is carried in the Route header field or Request-URI header field of said REFER message.

Preferably, said notice HOPF carries out the heterogeneous network hand-off process and is specially:

Said source AG directly sends sip message to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process;

Perhaps, said AG sends sip message through said ISCF to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process.

Preferably, said HOPF notifies said target MSC to prepare switchable resource and sets up the required carrying of switching and is specially:

Said HOPF sends MAP to said target MSC and prepares handoff request MAP_Prepare_Handover_req message, carries the received relevant parameter by the switching in the said sip message of said source AG transmission of said HOPF in the said MAP_Prepare_Handover_req message.

Preferably, the relevant parameter that carries switching in the said MAP_Prepare_Handover_req message is specially:

The Target cell parameter maps of the relevant parameter of the switching in the said sip message that said HOPF will be sent by said source AG is the Target Cell Id parameter in the said MAP_Prepare_Handover_req message, is the TargetRNC Id parameter in the said MAP_Prepare_Handover_req message with the Target RNC parameter maps.

Preferably, said HOPF notification target MSC prepares switchable resource and sets up to switch to be specially:

After said target MSC receives said MAP_Prepare_Handover_req message, send handoff request to said Target RNC; After said target MSC receives the switching request response of said Target RNC, send MAP to said HOPF and prepare handover request ack message;

Said HOPF sets up interoffice with said target MSC and carries after receiving the MAP preparation switching request response of said target MSC transmission, and notifies said target MSC to set up the interoffice carrying through initialization address message IAM;

Said target MSC and said HOPF notify said HOPF through Address Complete Message ACM after setting up the interoffice carrying.

Preferably, said method also comprises:

After said HOPF received said ACM message, the opposite end UE or the IP between the target AG that set up with to be switched user equipment (UE) session through sip message carried, and notify said ISCF or said source AG switching to be ready to complete through sip message.

Preferably, said method also comprises:

After said HOPF receives said ACM message; Send sip message notification call progress to said source AG; Wherein, The sip message of notification call progress is a call progress message 183, carries the medium face resource information that said HOPF reserves in the Session Description Protocol SDP field in the said call progress message 183.

Preferably, said HOPF notification target MSC prepares switchable resource and sets up the required carrying of switching to be specially:

Said HOPF is notified carry out sip message that heterogeneous network switches after, send MAP_Prepare_Handover_req message to said target MSC; Wherein, said HOPF relevant parameter that received said notice is carried out the switching in the sip message that heterogeneous network switches is mapped to the corresponding parameter in the said MAP_Prepare_Handover_req message.

Preferably, the relevant parameter of said switching comprises the coding/decoding information that Target cell and Target RNC relevant information and current business adopt.

Preferably, when said HOPF notifies the said source AG of said ISCF to switch to be ready to complete through sip message, said ISCF said HOPF carry with IP with the opposite end UE of to be switched UE session set up accomplish after, notify said source AG to switch and be ready to complete.

A kind of changing method comprises:

After source MSC received handoff request, notice HOPF prepared to switch;

Said HOPF notification target AG prepares switchable resource and sets up IP to carry;

Said HOPF notifies said source MSC to switch and is ready to complete, and said source MSC notification source RNC switches.

Preferably, said notice HOPF prepares to switch and is specially:

Source MSC obtains the address information of said HOPF; Send MAP_Prepare_Handover_req message to said HOPF; Carry switching-related parameters in the said MAP_Prepare_Handover_req message, the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

Preferably, said HOPF notification target AG prepares switchable resource and sets up the IP carrying to be specially:

After said HOPF receives the MAP_Prepare_Handover_req message of said source MSC; Obtain address information and the switching-related parameters of said target AG; Said switching-related parameters is mapped to notifies in the sip message that said target AG prepares to switch and send to said target AG, notify said target AG to prepare to switch.

Preferably, saidly notify said target AG to prepare to switch through sip message to be specially:

Said HOPF directly sends sip message to said target AG, notifies said target AG to prepare to switch;

Perhaps, said HOPF sends sip message through ISCF to said target AG, notifies said target AG to prepare to switch; Wherein, carry switching-related parameters in the notified SIP message and switch sign.

Preferably, said HOPF notification target AG prepares switchable resource and sets up the IP carrying to be specially:

After said target AG receives the notice of preparing to switch, send handoff request message RELOCATION REQUEST to Target RNC, notification target RNC prepares the wireless side resource;

After said target AG receives the switching request response of said Target RNC, notify said HOPF or said ISCF wireless side resource to be ready to complete through sip message.

Preferably, said method also comprises:

When said HOPF adopts the said target AG of REFER message informing to prepare to switch, said HOPF receive switch be ready to complete the notice NOTIFY after and set up IP between the said target AG and carry;

When said HOPF adopted INVITE to notify said target AG to prepare to switch, the IP between said HOPF and the said target AG was carried in the said INVITE conversation procedure and sets up.

Preferably, said method also comprises:

Said HOPF directly or indirectly with between the said target AG sets up the IP carrying through INVITE.

Preferably, said method also comprises:

After setting up the IP carrying between said HOPF and the said target AG, said HOPF is ready to complete through the said source MSC switching of MAP_Prepare_Handover_rsp message informing; Wherein, carry the Handover Number that said HOPF distributes in the said MAP_Prepare_Handover_rsp message.

Preferably, said method also comprises:

After the switching that said source MSC receives said HOPF is ready to complete notice, sets up interoffice with said HOPF and carry, and notify said HOPF to set up the interoffice carrying through IAM;

After said HOPF received said IAM, reserved resource and homology MSC set up interoffice and carry, and send ACM message to said source MSC;

After said source MSC receives ACM message, send switching command to said source RNC.

A kind of switched system is applied in the wireless communication system, said switched system comprise source AG, source RNC, Target RNC, target MSC, target AG, to be switched UE and with the opposite end UE of to be switched UE session, wherein:

Source AG, after being used to receive handoff request, notice HOPF carries out the heterogeneous network hand-off process; And after receiving the ready notice of switching, notification source RNC switches;

HOPF, after being used to receive the heterogeneous network switching notice of said source AG, notification target MSC prepares switchable resource and sets up to switch required carrying.

Preferably, said source AG is further used for directly sending sip message to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process;

Perhaps, said AG is further used for sending sip message through said ISCF to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process.

Preferably; Said HOPF further sends MAP_Prepare_Handover_req message to said target MSC, carries the received relevant parameter by the switching in the said sip message of said source AG transmission of said HOPF in the said MAP_Prepare_Handover_req message.

Preferably, said target MSC further sends handoff request to said Target RNC after receiving said MAP_Prepare_Handover_req message;

After said target MSC receives the switching request response of said Target RNC, further send MAP and prepare handover request ack message to said HOPF;

Said HOPF further sets up interoffice with said target MSC and carries after receiving the MAP preparation switching request response of said target MSC transmission, and notifies said target MSC to set up the interoffice carrying through initialization address message IAM;

Said target MSC and said HOPF further notify said HOPF through ACM after setting up the interoffice carrying.

Preferably, said HOPF is after receiving said ACM message, and further opposite end UE or the IP between the target AG through sip message foundation and to be switched user equipment (UE) session carries, and notifies said ISCF or said source AG switching to be ready to complete through sip message.

A kind of switched system is applied in the wireless communication system, said switched system comprise source AG, source RNC, Target RNC, target MSC, target AG, to be switched UE and with the opposite end UE of to be switched UE session, it is characterized in that:

Source MSC, after being used to receive handoff request, notice HOPF prepares to switch; And notification source RNC switches after the switching that receives HOPF is ready to complete;

HOPF, be used to receive prepare switching notice after, notification target AG prepares switchable resource and also sets up IP and carry; And, notify said source MSC to switch and be ready to complete.

Preferably; Said source MSC is further used for obtaining the address information of said HOPF; Send MAP_Prepare_Handover_req message to said HOPF; Carry switching-related parameters in the said MAP_Prepare_Handover_req message, the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

Preferably; Said HOPF is after receiving the MAP_Prepare_Handover_req message of said source MSC; Further obtain address information and the switching-related parameters of said target AG; Said switching-related parameters is mapped to notifies in the sip message that said target AG prepares to switch and send to said target AG, notify said target AG to prepare to switch.

Preferably, said HOPF directly sends sip message to said target AG, notifies said target AG to prepare to switch;

Perhaps, said HOPF sends sip message through ISCF to said target AG, notifies said target AG to prepare to switch; Wherein, carry switching-related parameters in the notified SIP message and switch sign.

Preferably, after said target AG receives the notice of preparing to switch, send handoff request message RELOCATION REQUEST to Target RNC, notification target RNC prepares the wireless side resource;

After said target AG receives the switching request response of said Target RNC, notify said HOPF or said ISCF wireless side resource to be ready to complete through sip message.

Preferably, when said HOPF adopts the said target AG of REFER message informing to prepare to switch, said HOPF receive switch be ready to complete the notice NOTIFY after and set up IP between the said target AG and carry;

When said HOPF adopted INVITE to notify said target AG to prepare to switch, the IP between said HOPF and the said target AG was carried in the said INVITE conversation procedure and sets up.

Preferably, after setting up IP between said HOPF and the said target AG and carrying, said HOPF switches through the said source MSC of MAP_Prepare_Handover_rsp message informing and is ready to complete; Wherein, carry the Handover Number that said HOPF distributes in the said MAP_Prepare_Handover_rsp message.

Preferably, after the switching that said source MSC receives said HOPF is ready to complete notice, sets up interoffice with said HOPF and carry, and notify said HOPF to set up the interoffice carrying through IAM;

After said HOPF received said IAM, reserved resource and homology MSC set up interoffice and carry, and send ACM message to said source MSC;

After said source MSC receives ACM message, send switching command to said source RNC.

Among the present invention, after source AG received handoff request, notice HOPF carried out the heterogeneous network hand-off process; HOPF notification target MSC prepares switchable resource and sets up to switch required carrying; Source AG notification source radio network controller (RNC) switches.And after source MSC received handoff request, notice HOPF prepared to switch; HOPF notification target AG prepares switchable resource and sets up IP to carry; HOPF notifies said source MSC to switch and is ready to complete, and source MSC notification source RNC switches.With respect to prior art, the present invention has simplified the switching message flow, with respect to prior art, has improved the efficient that system is switched, and the user can not feel can not exist professional switch unusual and switch the concussion problem, has promoted professional user experience effect.

Description of drawings

Fig. 1 is linked into the application scenarios sketch map of unified IP kernel heart net for adopting the CS access way;

Fig. 2 inserts the Organization Chart of unified IP kernel heart net for CS;

Fig. 3 is the composition structural representation of the system of the present invention's switching;

Fig. 4 is the flow chart of the changing method embodiment one of the embodiment of the invention;

Fig. 5 is the flow chart of the changing method embodiment two of the embodiment of the invention;

Fig. 6 is the flow chart of the changing method embodiment three of the embodiment of the invention;

Fig. 7 is the flow chart of the changing method embodiment four of the embodiment of the invention;

Fig. 8 is the flow chart of the changing method embodiment five of the embodiment of the invention;

Fig. 9 is the flow chart of the changing method embodiment six of the embodiment of the invention.

Embodiment

Basic thought of the present invention is, receive the handoff request of source RNC as source SA after, be that to be switched UE prepares resource through sip message notification target SA; After receiving sip message, target SA is that to be switched UE prepares resource, and the carrying between foundation and the source SA, and notification source SA switches ready afterwards; Source SA notifies to be switched UE to switch to objective network.

For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.

Fig. 3 is for the composition structural representation of the system of the present invention's switching, and is as shown in Figure 3, and the system that the present invention is switched comprises: IP network is initiated network element, HOPF that switches and the target MSC that switches to.The above-mentioned IP network is initiated the network element of switching, and concrete network element can be ISCF or AG etc., and can know handoff request and judge is to switch to the CS territory, and selects appropriate H OPF according to carrier policy, and this request is sent to HOPF.Above-mentioned HOPF is a logical ne that increases newly; Between IP network and CS network; Relevant Session Initiation Protocol and the mutual translation function between the MAP signaling can realized switching between IP network and the CS network; Be termination SIP signaling promptly and convert thereof into the MAP signaling and send to CS territory related network elements, the CS network is termination MAP signaling and converts thereof into the related network elements that the SIP signaling sends to IP network HOPF also can be used as the switching flow between two networks of agent network element control simultaneously IP network.

Mutual and the various functions that realize are described through following flow process between the function of each network element and each network element in the system that the present invention is switched.It will be appreciated by those skilled in the art that the description through following Fig. 4 to Fig. 9, respectively form the function that network element and each network element can be realized in the system that the present invention is switched, is to understand easily.

Above-mentioned target MSC is existing MSC, can receive the handoff request that HOPF sends, and carries out service switchover.

The service switchover of the heterogeneous network that relates among the present invention is divided into two different service scenes, and being respectively the user switches to the CS network and the user switches to IP network from the CS network from IP network.The realization flow of these two business scenarios is also different, in order to make the object of the invention, technical scheme and advantage clearer, respectively the implementation method of these two kinds of business scenarios is described below in conjunction with accompanying drawing and specific embodiment.

The IP network that Fig. 4 to Fig. 6 is the embodiment of the invention to be provided switches to the flow chart of CS network.In above-mentioned flow chart shown in the present; UE1 and UE2 are the both sides of conversation; UE1 switches to the CS core net from the above-mentioned IP core net in communication process; Source RNC, source AG and source ISCF are respectively RNC, AG and the ISCF of UE1 before switching, and target MSC and Target RNC are the MSC and the RNC of the UE1 objective network that will switch to, and HOPF carries out the switching acting server that will use when heterogeneous network switches.Below, further illustrate the function of said network element and interacting message and the processing mode between these network elements through following handoff procedure.

Fig. 4 is the flow chart of the changing method embodiment one of the embodiment of the invention, and is as shown in Figure 4, and the changing method of this example specifically may further comprise the steps:

Step 401, UE sends measurement report (Measurement Report) to source RNC.

Step 402, source RNC judges that according to measurement report UE1 need switch.

Step 403, source RNC sends handoff request (RELOCATION REQUIRED) to source AG, carries the parameters such as Target cell that switch to.

Step 404; Source AG obtains the handoff parameters such as Target cell in the handoff request; After judging user's needs and switch to the CS network according to Target cell and carrier policy or other feasible methods; Source AG selects appropriate H OPF according to operator's collocation strategy; And convert the handoff request that receives to call transfer request (REFER) and send to ISCF, carry relevant handoff parameter in the message, comprise medium encoding and decoding relevant information that Target cell and Target RNC relevant information, Subscriber Number, said AG support etc.Carry in the REFER message and switch sign, can in the method for Refer-to header field parameter, carry, for example take following form: method=handover.Carry the HOPF address in the REFER message, can in the Request-URI header field, carry, promptly the Request-URI header field is filled in the HOPF address.

Step 405, ISCF accepts message (202Accepted) to source AG callback transfer request after receiving REFER.

Step 406, ISCF gives this HOPF with the REFER forwards.

Step 407, HOPF returns 202Accepted message to ISCF after receiving the REFER request.

Step 408; HOPF switches according to the sign of the switching in REFER message judgement needs; HOPF obtains target MSC; And generation MAP prepares handoff request (MAP_Prepare_Handover_req); Simultaneously the switching-related parameters in the REFER message that gets access to is mapped to MAP message and prepares corresponding parameters in the handoff request (MAP_Prepare_Handover_req message); Concrete mapping method can for example become MAP to prepare the Target Cell Id parameter in the handoff request Target cell parameter maps of carrying in the REFER message with reference to the concrete implication of each parameter in the message, and the Target RNC parameter maps becomes MAP to prepare the Target RNC Id parameter in the handoff request.Certainly need the parameter of mapping to be not limited to this parameter, but all can take said method to carry out corresponding mapping according to the implication of parameter.HOPF will prepare handoff request message and send to target MSC afterwards.

The method that HOPF obtains target MSC can be to select according to Target cell and operator's collocation strategy, can certainly adopt other feasible modes.

Step 409, target MSC are distributed Handover Number after receiving and preparing handoff request, send handoff request (RELOCATION REQUEST) to Target RNC simultaneously.

Step 410, Target RNC begin the access network resource reservation procedure after receiving handoff request, distribute corresponding radio resource for UE1 inserts 3G network from Target RNC.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target MSC afterwards.

Step 411, target MSC are sent preparation switching request response (MAP_Prepare_Handover_rsp) to HOPF after receiving switching request response.

Step 412, beginning was set up the interoffice carrying with target MSC after HOPF received and prepares switching request response.HOPF sends initialization address (IAM) message to target MSC.

Step 413, target MSC sends complete (ACM) message in address to HOPF

Step 414 after HOPF receives Address Complete Message, knows that promptly switching is ready, and HOPF converts it into notice (NOTIFY) message and sends to ISCF, and notice ISCF switches ready.Switch in the reason parameter of Subscription-State header field that the sign be ready to complete can be placed on NOTIFY and carry.

Step 415 after ISCF receives notification message, is returned acknowledge message (200OK) to HOPF.

The handling process that following steps 416～step 421 relates to is the process that UE2 upgrades distant end media, this process has numerous embodiments, and this example has only illustrated wherein a kind of, is not to be used for qualification of the present invention.

Step 416, ISCF carries the media information of UE2 to the HOPF invitation (INVITE) that makes a call in SDP.

Step 417, HOPF is updated to the media information of UE2 with the distant end media surface information, sends response message (200OK) to ISCF afterwards, carries the local terminal media information of reservation in the message.

Step 418, ISCF sends to HOPF and replys acknowledge message (ACK).

Step 419, ISCF makes a call to UE2 and heavily invites (REINVITE), in SDP, carries the media information of HOPF.

Step 420, UE2 is updated to the media information of HOPF with the distant end media surface information, sends response message (200OK) to ISCF afterwards, carries the local terminal media information in the message.

Step 421, ISCF sends to UE2 and replys acknowledge message (ACK).

Above-mentioned steps 416 and the no strict ordinal relation of step 415 can be carried out simultaneously.

Step 422, ISCF sends a notification message (NOTIFY) to AG, and notification source AG switches ready.

Step 423 after AG receives notification message, is returned acknowledge message (200OK) to ISCF.

Step 424, AG sends switching command (Relocation Command) to source RNC.

Step 425, source RNC transmits switching command to UE1.

Step 426, Target RNC switches, and UE1 begins the Radio Resource of access destination RNC.

Step 427, RNC detects after the UE1, sends to target MSC and switches probe message (Relocation Detect).

Step 428, Target RNC receive after the handover success message of UE1 transmission, change to target MSC and accomplish message (Relocation Complete).

Step 429, target MSC switches completion through MAP message to the HOPF notice.

Step 430, target MSC sends response message (ANM) to HOPF, and the interoffice of connecting between target MSC and the HOPF carries.

Step 431, HOPF sends a notification message (NOTIFY) to ISCF, and notice ISCF switching is accomplished.The sign of switch accomplishing can be placed in the reason parameter of Subscription-State header field of NOTIFY and carry.

Step 432 after ISCF receives notification message, is returned acknowledge message (200OK) to HOPF.

Step 433, ISCF transmits notification message (NOTIFY) notice AG to AG and switches and accomplish, and release and the AG session of before switching, setting up.

Step 434 after AG receives notification message, is returned acknowledge message (200OK) to ISCF.

Step 435, link of AG notification source RNC release signaling and bearing resource.

Through above step, UE1 has accomplished the handoff procedure from the above-mentioned IP network to the CS network.

Fig. 5 is the flow chart of the changing method embodiment two of the embodiment of the invention; As shown in Figure 5; The main distinction of embodiment one among present embodiment and above-mentioned Fig. 4 is; Switching relevant message among the embodiment one is to issue HOPF (seeing step 404～step 407) by AG through ISCF, is directly to issue HOPF (seeing step 504～step 505) by AG and switch relevant message among the embodiment two.In addition, among the embodiment two UE2 carry out process that the distant end media face upgrades adopted with embodiment one in different embodiment (seeing step 416～step 421 and step 512～step 517).

As shown in Figure 5, the changing method of example of the present invention specifically may further comprise the steps:

Step 501～step 503, AG receives the process of handoff request, with aforementioned step 401～step 403.

Step 504; AG obtains the handoff parameters such as Target cell in the handoff request; After judging user's needs and switch to the CS network according to Target cell and carrier policy or other feasible methods; AG selects appropriate H OPF according to operator's collocation strategy; And convert the handoff request that receives to call transfer request (REFER) and send to HOPF, carry relevant handoff parameter in the message, as comprise medium encoding and decoding relevant information that Target cell and Target RNC relevant information, Subscriber Number, said AG support etc.Carry in the REFER message and switch sign, can in the method for Refer-to header field parameter, carry, for example take following form: method=handover.Carry the HOPF address in the REFER message, can in the Request-URI header field, carry, promptly the Request-URI header field is filled in the HOPF address.

Step 505, HOPF accepts message (202Accepted) to the AG callback transfer request after receiving REFER.

Step 506～step 511, objective network are switched the process of preparation and resource reservation, with step 408-413.

Following steps 512～step 517 is processes that UE2 upgrades distant end media, and this process has numerous embodiments, and that lists here is just wherein a kind of.

Step 512, HOPF obtains the ISCF address in the REFER message that AG sends, and to this ISCF invitation (INVITE) that makes a call, in SDP, carries the media information of local terminal.Wherein carrying the number that switches sign and UE1 in the INVITE is used for notifying ISCF user terminal UE1 to initiate service switchover.The mode of carrying of switching sign can be taked through in the Request-URI header field, increasing the mode of expansion, and for example Request-URI can take following form: destination address; Method=handover.The method=handover here switches sign exactly.Certainly switch the multiple mode that carries of sign, more than just provide an example, but be not limited thereto.The number of UE1 also can be placed among the Request-URI and carry through the mode of parameter expansion, for example can take following form: userNumber=XXXX.

Step 513, ISCF makes a call to UE2 and heavily invites (REINVITE), in SDP, carries the media information of HOPF.

Step 514 after UE2 receives REINVITE, is updated to the media information of HOPF with the distant end media surface information, sends response message (200OK) to ISCF afterwards, carries the local terminal media information in the message.

Step 515 after ISCF receives and replys, is replied acknowledge message (ACK) to the UE2 transmission.

Step 516, ISCF obtains the UE2 media information in the response message, sends response message (200OK) to HOPF, wherein carries the media information of UE2.

Step 517, HOPF is updated to the media information of UE2 with the media information of far-end, sends to ISCF afterwards and replys acknowledge message (ACK).

Step 518 after HOPF receives and replys acknowledge message, sends a notification message (NOTIFY) to AG, and notification source AG switches ready.Switch in the reason parameter of Subscription-State header field that the sign be ready to complete can be placed on NOTIFY and carry.

Step 519 after AG receives notification message, is returned acknowledge message (200OK) to HOPF.

Step 520～step 526, description be that core net notice UE1 switches and accomplishes the process that HOPF is notified in the back switching, with aforementioned step 424～step 430.

Step 527, HOPF receives and carries after the MAP message of switching completion information, sends a notification message (NOTIFY) to AG, and notice AG switches and accomplishes, and release and the AG session of before switching, setting up.The sign of switch accomplishing can be placed in the reason parameter of Subscription-State header field of NOTIFY and carry.

Step 528 after AG receives notification message, is returned acknowledge message (200OK) to HOPF.

Step 529, link of AG notification source RNC release signaling and bearing resource.

Through said process, UE1 has accomplished the switching from the above-mentioned IP network to the CS network.

Fig. 6 is the flow chart of the changing method embodiment three of the embodiment of the invention; As shown in Figure 6; The main distinction of present embodiment and earlier figures 4 figure and two embodiment shown in 5 is: AG or ISCF adopt REFER message informing HOPF to switch (seeing step 406 and step 504) among preceding two embodiment, and present embodiment is to adopt INVITE notice HOPF to switch (seeing step 604); Media Stream after switching among preceding two embodiment is to be anchored on the HOPF; And no longer through source AG (step 416～step 421; And; Step 512～step 517), and present embodiment is that the Media Stream after switching is anchored on the AG, and the Media Stream that UE1 sends after promptly switching is to issue UE2 (step 612～step 614) again through HOPF and AG.

As shown in Figure 6, the changing method of present embodiment specifically may further comprise the steps:

Step 601～step 603, AG receives the process of handoff request, with step 401～step 403.

Step 604; AG obtains the handoff parameters such as Target cell in the handoff request; After judging user's needs and switch to the CS network according to Target cell and carrier policy or other feasible methods; AG selects appropriate H OPF according to operator's collocation strategy; And convert the handoff request that receives to calling invitation request (INVITE) and send to this HOPF, carry relevant handoff parameter in the message, comprise medium encoding and decoding relevant information that Target cell and Target RNC relevant information, Subscriber Number, said AG support etc.Carry in the message and switch sign, the mode of carrying of switching sign can be taked through in the Request-URI header field, increasing the mode of expansion, and for example Request-URI can take following form: destination address; Method=handover.The method=handover here switches sign exactly.Certainly switch the multiple mode that carries of sign, more than just provide an example, but be not limited thereto.Carry the HOPF address in the REFER message, can in the Request-URI header field, carry, promptly the Request-URI header field is filled in the HOPF address.In addition, also carry the medium face resource information that AG reserves among the SDP of INVITE.

Step 605; After HOPF receives INVITE; Switching sign judgement needs according to wherein switch, and HOPF obtains target MSC, and produce MAP preparation handoff request (MAP_Prepare_Handover_req); HOPF is mapped to MAP message with the switching-related parameters in the INVITE that gets access to and prepares corresponding parameters in the handoff request; Concrete mapping method can for example become MAP to prepare the Target Cell Id parameter in the handoff request Target cell parameter maps of carrying in the INVITE with reference to the concrete implication of each parameter in the message, becomes MAP to prepare the Target RNC Id parameter in the handoff request Target RNC parameter maps.Certainly need the parameter of mapping to be not limited to this parameter, but all can take said method to carry out corresponding mapping according to the implication of parameter.HOPF will prepare handoff request message and send to target MSC afterwards.

The mode that HOPF obtains target MSC can be to be selected to be placed on afterwards by AG to bring HOPF in the INVITE, also can be that HOPF oneself selects according to Target cell and operator's collocation strategy.

Step 606～step 610 is with step 507～step 511.

Step 611, HOPF receives Address Complete Message (ACM) afterwards, sends call progress message (183Call Progress) to AG.In addition, also carry the medium face resource information that HOPF reserves among the SDP of 183 message.

Step 612 after AG receives call progress message, is sent switching command (RelocationCommand) to source RNC.

Step 613～step 618 is with step 521～step 526.

Step 619 after HOPF receives the response message (ANM) of target MSC transmission, is sent response message (200OK) to AG.

Step 620 after AG receives response message, is answered acknowledge message (200OK) to the HOPF response.

Step 621, link of AG notification source RNC release signaling and bearing resource, and notice ISCF user equipment (UE) 1 has switched to objective network.

Through said process, UE1 has accomplished the switching from the above-mentioned IP network to the CS network.

Fig. 7 to Fig. 9 is the flow chart that CS network that the embodiment of the invention provides switches to IP network; UE1 and UE2 are the both sides of conversation in said flow chart; UE1 switches to IP kernel heart net from above-mentioned CS core net in communication process; Source RNC, source MSC are RNC and the MSC of UE1 before switching, and ISCF, target AG and Target RNC are ISCF, AG and the RNC of the UE1 objective network that will switch to, and HOPF carries out the switching acting server that will use when heterogeneous network switches.

Fig. 7 is the flow chart of the changing method embodiment four of the embodiment of the invention, and is as shown in Figure 7, and the changing method of present embodiment specifically may further comprise the steps:

Step 701, UE sends measurement report (Measurement Report) to source RNC.

Step 702, source RNC judges that according to measurement report UE1 need switch.

Step 703, source RNC sends handoff request (RELOCATION REQUIRED) to source MSC.

Step 704; After source MSC receives handoff request; Judging according to Target cell is that needs switch to IP network, and selects appropriate H OPF according to target cell information and carrier policy, sends MAP to this HOPF and prepares handoff request (MAP_Prepare_Handover_req); Carry switching-related parameters in the message, like Target cell, Target RNC relevant information and encoding and decoding relevant information etc.

Step 705; HOPF distributes Handover Number after receiving and preparing handoff request, and according to Target cell and carrier policy or other suitable manner select target ISCF and target AG; HOPF becomes call transfer request (REFER) message to send to target ISCF the MAP message conversion that receives; What fill in destination address (Refer-To) header field that requires in the REFER message to get in touch is the address of target AG, carries in the message and switches sign, like method=handover.Carry switching-related parameters in the message, switching-related parameters is to prepare mapping the handoff request message from MAP, comprises Target cell, Target RNC relevant information and encoding and decoding relevant information etc.The method that switching-related parameters carries is not limit, and can be placed among the SDP (Session Description Protocol, Session Description Protocol) of REFER to carry through XML (extensible markup language, extend markup language) expansion etc.

Step 706, ISCF accepts (202Accepted) message to the HOPF callback transfer request after receiving call transfer request message.

Step 707, ISCF obtains target AG address, to target AG forwarded call transfer request (REFER).The method that ISCF obtains target AG can be to obtain target AG according to the Target cell that carries in the REFER message or Target RNC information and carrier policy, also can be to be placed in the REFER message after HOPF obtains to bring ISCF.This step and step 706 do not have strict sequencing relation, can carry out simultaneously.

Step 708, target AG receives call transfer request (REFER) back and accepts (202Accepted) message to the HOPF callback transfer request.

Step 709, target AG converts call transfer request (REFER) to handoff request (RELOCATION REQUEST) message, sends to Target RNC.It is prior art that target AG becomes the method for RELOCATION REQUEST with the REFER message conversion, does not give unnecessary details at this.

Step 710, Target RNC begin the access network resource reservation procedure after receiving handoff request, distribute corresponding radio resource for UE1 inserts 3G network from Target RNC.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target MSC afterwards.

Step 711, target AG receives this response back and sends a notification message (NOTIFY) to ISCF, and notice AG switches ready.

Step 712～step 713, ISCF is transmitted to HOPF with notice after receiving notice, and sends notification acknowledgement (200OK) to target AG.Step 712 and 713 can be carried out simultaneously, does not have strict sequencing relation.

Step 714, HOPF receives the notice back and returns notification acknowledgement (200OK) to ISCF.

Following step 715-720 is that HOPF sets up the process that IP carries through ISCF and target AG.This process has multiple implementation, and what describe in the present embodiment only is wherein a kind of implementation.

The flow process that step 715～step 716 relates to, what relate to is the HOPF reserved resource, sends calling invitation (INVITE) to ISCF, carries the medium face resource information that local terminal is reserved among the SDP.After receiving, ISCF gives target AG with this forwards.

Step 717～step 718, target AG carries the media information of local terminal to ISCF echo reply message (200OK), and ISCF is transmitted to HOPF with it.

Step 719～step 720, HOPF sends to ISCF and replys acknowledge message (ACK), and ISCF is transmitted to target AG with it.

Step 721, HOPF sends MAP to source MSC and prepares handoff response (MAP_Prepare_Handover_rsp) message, carries the parameters such as Handover Number that HOPF distributes.

Step 722～step 723 and step 734 are that source MSC and HOPF set up the process that interoffice carries; Can adopt signalings such as ISUP or BICC to set up interoffice between source MSC and the HOPF carries; Different signaling message flow processs according to adopting can be different; Here be that this interoffice of example carries process and the principle of setting up with the isup message, other signalings are also similar.

Step 722, source MSC sends initialization address message (IAM) to HOPF.

Step 723, HOPF sends Address Complete Message (ACM) to source MSC.

Step 724～step 726 is sent switching command to source RNC after source MSC receives, and source RNC is transmitted to UE1 with it.UE1 switches to Target RNC after receiving switching command.

Step 727～step 728, UE1 switches to Target RNC, and UE1 begins the Radio Resource of access destination RNC.RNC detects after the UE1, sends to target AG and switches probe message (Relocation Detect).Target RNC receives after the handover success message of UE1 transmission, sends handoff completion message (Relocation Complete) to target AG.

Step 729, target AG sends a notification message (NOTIFY) to ISCF after receiving handoff completion message, and notice ISCF switching is accomplished.

Step 730～step 731 after ISCF receives notification message, is returned acknowledge message (200OK) to target AG.And notification message is transmitted to HOPF.Step 730-731 does not have strict ordinal relation.

Step 732～step 733, HOPF returns acknowledge message (200OK) to ISCF after receiving notification message, and sends switching to source MSC through the AP signaling and accomplish notice.In the present embodiment, there is not strict ordinal relation between the step 732 and 733.

Step 734, HOPF sends the interexchange circuit between response message (ANM) connection and the source MSC to source MSC.

Step 735, link of source MSC notification source RNC release signaling and bearing resource.

Through said process, UE1 has accomplished the switching from the CS network to the above-mentioned IP network.

Fig. 8 is the flow chart of the changing method embodiment five of the embodiment of the invention; As shown in Figure 8; The main distinction of embodiment shown in present embodiment and Fig. 7 is; In the handling process among Fig. 7, switch relevant message and be the ISCF of HOPF through objective network and issue target AG (seeing step 705～step 708), and set up IP between follow-up HOPF and the target AG and carry also and realize (seeing step 714～step 720) as the agency through ISCF.And be the address that directly gets access to target AG by HOPF in the present embodiment, switching relevant message is directly to issue target AG (seeing step 805～step 806) by HOPF, follow-up by HOPF directly and set up IP between the target AG and carry (seeing step 811～step 813).

As shown in Figure 8, the changing method of present embodiment specifically may further comprise the steps:

What step 801～step 804 was described is that source RNC sends handoff request to source MSC, and source MSC sends the process of preparing handoff request to HOPF, with step 701～step 704.

Step 805; After HOPF receives and prepares handoff request; Distribute Handover Number, and obtain target AG address according to Target cell and carrier policy or other suitable manner, HOPF becomes call transfer request (REFER) message to send to target AG the MAP message conversion that receives.What fill in destination address (Refer-To) header field that requires in the REFER message to get in touch is the address of target AG, carries in the message and switches sign, like method=handover.Carry switching-related parameters in the message, switching-related parameters is to prepare mapping the handoff request message from MAP, comprises Target cell, Target RNC relevant information and encoding and decoding relevant information etc.The method that switching-related parameters carries is not limit, and can be placed among the SDP (Session Description Protocol, Session Description Protocol) of REFER to carry through XML (extensible markup language, extend markup language) expansion etc.

Step 806, target AG accepts (202Accepted) message to the HOPF callback transfer request after receiving call transfer request message.

Step 807, target AG converts call transfer request (REFER) to handoff request (RELOCATION REQUEST) message simultaneously, sends to Target RNC.It is prior art that target AG becomes the method for RELOCATION REQUEST with the REFER message conversion, does not give unnecessary details at this.

Step 808, Target RNC begin the access network resource reservation procedure after receiving handoff request, distribute corresponding radio resource for UE1 inserts 3G network from Target RNC.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target AG afterwards.

Step 809, target AG sends a notification message (NOTIFY) to HOPF after receiving switching request response, and notice HOPF switches ready.

Step 810, HOPF receives the notice back and sends notification acknowledgement (200OK) to target AG.

Following steps 811～step 813 is to set up the process that IP carries between HOPF and the target AG.This process has multiple implementation, and what describe in the present embodiment only is wherein a kind of.

Step 811, the HOPF reserved resource, and to target AG transmission calling invitation (INVITE).

Step 812, target AG reserved resource, the medium face resource negotiation process of completion and HOPF is afterwards to HOPF echo reply message (200OK).

Step 813, HOPF sends to target AG and replys acknowledge message (ACK).

Step 814, HOPF sends to source MSC and prepares handoff response (MAP_Prepare_Handover_rsp) message, carries the parameters such as Handover Number that HOPF distributes.

Step 815～step 821 is that source MSC and HOPF set up the process of interoffice carrying and the process that UE1 begins to switch, with step 722～step 728.

Step 822, target AG sends a notification message (NOTIFY) to HOPF after receiving handoff completion message, and notice HOPF switching is accomplished.

Step 823～step 824 after HOPF receives notification message, is returned acknowledge message (200OK) to target AG.And send switching to source MSC through the MAP signaling and accomplish notice.

Step 825, HOPF sends the interexchange circuit between response message (ANM) connection and the source MSC to source MSC.

Step 826, link of source MSC notification source RNC release signaling and bearing resource.

Through said process, UE1 has accomplished the switching from the CS network to the above-mentioned IP network.

Fig. 9 is the flow chart of the changing method embodiment six of the embodiment of the invention; As shown in Figure 9; The main distinction of the embodiment that relates among present embodiment and Fig. 7 and Fig. 8 is: HOPF adopts REFER message informing target network element to switch (seeing step 705 and step 805) among two embodiment that relate among Fig. 7 and Fig. 8; Follow-up HOPF set up through the calling invitation flow process again and target AG between IP carry (see step 713～step 720, and, step 811～step 813).And the embodiment among Fig. 9 adopts calling invitation (INVITE) message informing target AG to switch (seeing step 905); Setting up between the follow-up and target AG that IP carries also is through this message flow (step 905, step 908, step 917, step 918); Be among preceding two embodiment the notification target network to be switched the IP that sets up target AG with HOPF to carry these two processes and separately realized, and these two processes are to realize through an INVITE flow process in the present embodiment.

As shown in Figure 9, the changing method of present embodiment specifically may further comprise the steps:

What step 901～step 904 was described is that source RNC sends handoff request to source MSC, and source MSC sends the process of preparing handoff request to HOPF, and is identical with step 701～step 704.

Following steps 905, step 908, step 917, step 918 have realized that notification target AG switches, and while and target AG set up the process that IP carries.

Step 905; After HOPF receives and prepares handoff request; Distribute Handover Number, and obtain target AG address according to Target cell and carrier policy or other suitable manner, HOPF becomes calling invitation message (INVITE) message to send to target AG the MAP message conversion that receives.Carry in this calling invitation request message and switch sign, it can be to realize through the method that method parameter in the route header field is expanded that INVITE carries the method for switching sign, for example can adopt following form, route: destination address; Method=handover.It can also be to realize through the method to the parameter expansion in the Request-URI header field that INVITE carries the method for switching sign, for example can adopt following form: destination address; Method=handover.According to switching sign, target AG can confirm follow-uply will carry out hand-off process.Carry switching-related parameters in the INVITE, switching-related parameters is to prepare mapping the handoff request message from MAP, comprises Target cell, Target RNC relevant information and encoding and decoding relevant information etc.The method that switching-related parameters carries is not limit, and can be placed among the SDP (Session Description Protocol, Session Description Protocol) of INVITE to carry through XML (extensible markup language, extend markup language) expansion etc.In addition, also carry the medium face resource information that HOPF reserves among the SDP of INVITE.

Step 906 after target AG receives INVITE, is sent handoff request RELOCATION REQUEST message to Target RNC, carries necessary switching-related parameters in the message.

Step 907, Target RNC begin the access network resource reservation procedure after receiving handoff request, distribute corresponding radio resource for UE1 inserts 3G network from Target RNC.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target AG afterwards.

Step 908, target AG sends call progress message (183Call Progress), the medium face resource information of carrying target AG among the SDP of this message to HOPF after receiving switching request response.

Step 909, HOPF sends MAP preparation switching response message (MAP_Prepare_Handover_rsp) to source MSC after receiving 183 message, carries the parameters such as Handover Number that HOPF distributes.

Step 910, after source MSC received and prepares switching request response, source MSC begins to set up the interoffice carrying with HOPF and notice UE1 begins to switch.

Step 910～step 916 is identical with step 722～step 728.

Step 917 after target AG receives handoff completion message, is replied (ACK) message to the HOPF transmission.

Step 918, HOPF receives after the response message to target AG echo reply acknowledge message (200OK).

Step 919, HOPF sends to switch through the MAP signaling to source MSC and accomplishes notice

Step 920, HOPF sends the interexchange circuit between response message (ANM) connection and the source MSC to source MSC.

Step 921, link of source MSC notification source RNC release signaling and bearing resource.

Through said process, UE1 has accomplished the switching from the CS network to the above-mentioned IP network.

More than, be merely preferred embodiment of the present invention, be not to be used to limit protection scope of the present invention.

Claims (39)

1. a changing method is characterized in that, said method comprises:

After source access gateway AG received handoff request, notice was switched agent functionality entity HOPF and is carried out the heterogeneous network hand-off process;

Said HOPF notification target moving exchanging center MSC is prepared switchable resource and sets up to switch required carrying;

Said source AG notification source radio network controller (RNC) switches.

2. method according to claim 1 is characterized in that, said notice HOPF carries out the heterogeneous network hand-off process and is specially:

Said source AG judge current switch to heterogeneous network and switch after, obtain the address information of said HOPF, notify said HOPF to carry out the heterogeneous network hand-off process through sip message.

3. method according to claim 2 is characterized in that, carries the relevant parameter of switching in the said sip message and/or switches sign.

4. method according to claim 3 is characterized in that, carries the relevant parameter of switching in the said sip message and/or switch sign to be specially:

Carry the relevant parameter that switches in the message body of said sip message and/or switch sign.

5. according to claim 3 or 4 described methods, it is characterized in that the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

6. method according to claim 3 is characterized in that, carries the relevant parameter of switching in the said sip message and/or switch sign to be specially:

Carry in the message header of said sip message and switch sign.

7. according to claim 1,2,3,4 or 6 described methods, it is characterized in that said sip message is a transfer request REFER message, and/or, the calling invitation INVITE.

8. method according to claim 7 is characterized in that, carries in the message header of said sip message to switch to identify to be specially:

For said REFER message, said switching sign is carried in the Route header field or Request-URI header field of said REFER message.

9. method according to claim 7 is characterized in that, said notice HOPF carries out the heterogeneous network hand-off process and is specially:

Said source AG directly sends sip message to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process;

Perhaps, said source AG sends sip message through ISCF to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process.

10. method according to claim 5 is characterized in that, said HOPF notifies said target MSC to prepare switchable resource and sets up the required carrying of switching and is specially:

Said HOPF sends MAP to said target MSC and prepares handoff request MAP_Prepare_Handover_req message, carries the received relevant parameter by the switching in the said sip message of said source AG transmission of said HOPF in the said MAP_Prepare_Handover_req message.

11. method according to claim 10 is characterized in that, the relevant parameter that carries switching in the said MAP_Prepare_Handover_req message is specially:

The Target cell parameter maps of the relevant parameter of the switching in the said sip message that said HOPF will be sent by said source AG is the Target Cell Id parameter in the said MAP_Prepare_Handover_req message, is the TargetRNC Id parameter in the said MAP_Prepare_Handover_req message with the Target RNC parameter maps.

12. method according to claim 11 is characterized in that, said HOPF notification target MSC prepares switchable resource and sets up to switch to be specially:

After said target MSC receives said MAP_Prepare_Handover_req message, send handoff request to said Target RNC; After said target MSC receives the switching request response of said Target RNC, send MAP to said HOPF and prepare handover request ack message;

Said HOPF sets up interoffice with said target MSC and carries after receiving the MAP preparation switching request response of said target MSC transmission, and notifies said target MSC to set up the interoffice carrying through initialization address message IAM;

Said target MSC and said HOPF notify said HOPF through Address Complete Message ACM after setting up the interoffice carrying.

13. method according to claim 12 is characterized in that, said method also comprises:

After said HOPF received said ACM message, the opposite end UE or the IP between the target AG that set up with to be switched user equipment (UE) session through sip message carried, and notify said ISCF or said source AG switching to be ready to complete through sip message.

14. method according to claim 12 is characterized in that, said method also comprises:

After said HOPF receives said ACM message; Send sip message notification call progress to said source AG; Wherein, The sip message of notification call progress is a call progress message 183, carries the medium face resource information that said HOPF reserves in the Session Description Protocol SDP field in the said call progress message 183.

15. method according to claim 5 is characterized in that, said HOPF notification target MSC prepares switchable resource and sets up the required carrying of switching to be specially:

Said HOPF is notified carry out sip message that heterogeneous network switches after, send MAP_Prepare_Handover_req message to said target MSC; Wherein, said HOPF relevant parameter that received said notice is carried out the switching in the sip message that heterogeneous network switches is mapped to the corresponding parameter in the said MAP_Prepare_Handover_req message.

16. method according to claim 15 is characterized in that, the relevant parameter of said switching comprises the coding/decoding information that Target cell and Target RNC relevant information and current business adopt.

17. method according to claim 13; It is characterized in that; When said HOPF notifies the said source AG switching of said ISCF to be ready to complete through sip message; Said ISCF said HOPF carry with IP with the opposite end UE of to be switched UE session set up accomplish after, notify said source AG to switch and be ready to complete.

18. a changing method is characterized in that, said method comprises:

After source MSC received handoff request, notice HOPF prepared to switch;

Said HOPF notification target AG prepares switchable resource and sets up IP to carry;

Said HOPF notifies said source MSC to switch and is ready to complete, and said source MSC notification source RNC switches.

19. method according to claim 17 is characterized in that, said notice HOPF prepares to switch and is specially:

Source MSC obtains the address information of said HOPF; Send MAP_Prepare_Handover_req message to said HOPF; Carry switching-related parameters in the said MAP_Prepare_Handover_req message, the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

20. method according to claim 19 is characterized in that, said HOPF notification target AG prepares switchable resource and sets up the IP carrying to be specially:

After said HOPF receives the MAP_Prepare_Handover_req message of said source MSC; Obtain address information and the switching-related parameters of said target AG; Said switching-related parameters is mapped to notifies in the sip message that said target AG prepares to switch and send to said target AG, notify said target AG to prepare to switch.

21. method according to claim 20 is characterized in that, saidly notifies said target AG to prepare to switch to be specially:

Said HOPF directly sends sip message to said target AG, notifies said target AG to prepare to switch;

Perhaps, said HOPF sends sip message through ISCF to said target AG, notifies said target AG to prepare to switch; Wherein, carry switching-related parameters in the notified SIP message and switch sign.

22. method according to claim 18 is characterized in that, said HOPF notification target AG prepares switchable resource and sets up the IP carrying to be specially:

After said target AG receives the notice of preparing to switch, send handoff request message RELOCATION REQUEST to Target RNC, notification target RNC prepares the wireless side resource;

After said target AG receives the switching request response of said Target RNC, notify said HOPF or said ISCF wireless side resource to be ready to complete through sip message.

23. method according to claim 22 is characterized in that, said method also comprises:

When said HOPF adopts the said target AG of REFER message informing to prepare to switch, said HOPF receive switch be ready to complete the notice NOTIFY after and set up IP between the said target AG and carry;

When said HOPF adopted INVITE to notify said target AG to prepare to switch, the IP between said HOPF and the said target AG was carried in the said INVITE conversation procedure and sets up.

24. method according to claim 23 is characterized in that, said method also comprises:

Said HOPF directly or indirectly with between the said target AG sets up the IP carrying through INVITE.

25. method according to claim 24 is characterized in that, said method also comprises:

After setting up the IP carrying between said HOPF and the said target AG, said HOPF is ready to complete through the said source MSC switching of MAP_Prepare_Handover_rsp message informing; Wherein, carry the Handover Number that said HOPF distributes in the said MAP_Prepare_Handover_rsp message.

26. method according to claim 24 is characterized in that, said method also comprises:

After the switching that said source MSC receives said HOPF is ready to complete notice, sets up interoffice with said HOPF and carry, and notify said HOPF to set up the interoffice carrying through IAM;

After said HOPF received said IAM, reserved resource and homology MSC set up interoffice and carry, and send ACM message to said source MSC;

After said source MSC receives ACM message, send switching command to said source RNC.

27. a switched system is applied in the wireless communication system, said switched system comprise source AG, source RNC, Target RNC, target MSC, target AG, to be switched UE and with the opposite end UE of to be switched UE session, it is characterized in that:

Source AG, after being used to receive handoff request, notice HOPF carries out the heterogeneous network hand-off process; And after receiving the ready notice of switching, notification source RNC switches;

HOPF, after being used to receive the heterogeneous network switching notice of said source AG, notification target MSC prepares switchable resource and sets up to switch required carrying.

28. system according to claim 27 is characterized in that, said source AG is further used for directly sending sip message to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process;

Perhaps, said AG is further used for sending sip message through said ISCF to said HOPF, notifies said HOPF to carry out the heterogeneous network hand-off process.

29. system according to claim 27; It is characterized in that; Said HOPF further sends MAP_Prepare_Handover_req message to said target MSC, carries the received relevant parameter by the switching in the said sip message of said source AG transmission of said HOPF in the said MAP_Prepare_Handover_req message.

30. system according to claim 29 is characterized in that, said target MSC further sends handoff request to said Target RNC after receiving said MAP_Prepare_Handover_req message;

After said target MSC receives the switching request response of said Target RNC, further send MAP and prepare handover request ack message to said HOPF;

Said HOPF further sets up interoffice with said target MSC and carries after receiving the MAP preparation switching request response of said target MSC transmission, and notifies said target MSC to set up the interoffice carrying through initialization address message IAM;

Said target MSC and said HOPF further notify said HOPF through ACM after setting up the interoffice carrying.

31. system according to claim 30; It is characterized in that; Said HOPF is after receiving said ACM message; Further opposite end UE or the IP between the target AG through sip message foundation and to be switched user equipment (UE) session carries, and notifies said ISCF or said source AG switching to be ready to complete through sip message.

32. a switched system is characterized in that, be applied in the wireless communication system, said switched system comprise source AG, source RNC, Target RNC, target MSC, target AG, to be switched UE and with the opposite end UE of to be switched UE session, it is characterized in that:

Source MSC, after being used to receive handoff request, notice HOPF prepares to switch; And notification source RNC switches after the switching that receives HOPF is ready to complete;

HOPF, be used to receive prepare switching notice after, notification target AG prepares switchable resource and also sets up IP and carry; And, notify said source MSC to switch and be ready to complete.

33. system according to claim 32; It is characterized in that; Said source MSC is further used for obtaining the address information of said HOPF; Send MAP_Prepare_Handover_req message to said HOPF, carry switching-related parameters in the said MAP_Prepare_Handover_req message, the relevant parameter of said switching comprises the medium coding/decoding information of the information of switching target small area and Target RNC, said source AG support and the coding/decoding information that current business adopts.

34. system according to claim 33; It is characterized in that; Said HOPF is after receiving the MAP_Prepare_Handover_req message of said source MSC; Further obtain address information and the switching-related parameters of said target AG, said switching-related parameters is mapped to notifies in the sip message that said target AG prepares to switch and send to said target AG, notify said target AG to prepare to switch.

35. system according to claim 34 is characterized in that, said HOPF directly sends sip message to said target AG, notifies said target AG to prepare to switch;

Perhaps, said HOPF sends sip message through ISCF to said target AG, notifies said target AG to prepare to switch; Wherein, carry switching-related parameters in the notified SIP message and switch sign.

36. system according to claim 32 is characterized in that, after said target AG receives the notice of preparing to switch, sends handoff request message RELOCATION REQUEST to Target RNC, notification target RNC prepares the wireless side resource;

After said target AG receives the switching request response of said Target RNC, notify said HOPF or said ISCF wireless side resource to be ready to complete through sip message.

37. system according to claim 36 is characterized in that, when said HOPF adopts the said target AG of REFER message informing to prepare to switch, said HOPF receive switch be ready to complete the notice NOTIFY after and set up IP between the said target AG and carry;

When said HOPF adopted INVITE to notify said target AG to prepare to switch, the IP between said HOPF and the said target AG was carried in the said INVITE conversation procedure and sets up.

38. system according to claim 36 is characterized in that, after setting up IP between said HOPF and the said target AG and carrying, said HOPF switches through the said source MSC of MAP_Prepare_Handover_rsp message informing and is ready to complete; Wherein, carry the Handover Number that said HOPF distributes in the said MAP_Prepare_Handover_rsp message.

39., it is characterized in that, after the switching that said source MSC receives said HOPF is ready to complete notice, sets up interoffice with said HOPF and carry, and notify said HOPF to set up the interoffice carrying through IAM according to the described system of claim 38;

After said HOPF received said IAM, reserved resource and homology MSC set up interoffice and carry, and send ACM message to said source MSC;

After said source MSC receives ACM message, send switching command to said source RNC.

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