CN1882119A

CN1882119A - Device, system and method for realizing inter-switching of circuit domain and packet domain

Info

Publication number: CN1882119A
Application number: CNA2005101062720A
Authority: CN
Inventors: 刘文宇; 尤昉; 徐杰; 李岩; 魏华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-09-26
Filing date: 2005-09-26
Publication date: 2006-12-20
Anticipated expiration: 2025-09-26
Also published as: CN100496137C

Abstract

The invention relates to a device fro switching circuit field to group field, and relative system and method, wherein said device comprises: circuit field network interface unit, group field network interface unit and switch control unit. Said method comprises: FBSC based on the circuit field mobile user mark searches for the attach field information of group field of mobile user; using said attach field network to initialize the traditional circuit field switch conversation process to the application server; the application server records said switch conversation and waits for switching conversation; the mobile station uses group field network to initialize the switch conversation to the application server and carry the mobile user circuit field mark; the application server, based on the mobile user circuit field mark searches for former record, to build conversation with mobile user. The invention can avoid the dependence on the intelligent network, avoid alternative route and save the network resource.

Description

A kind of realization circuit domain and the mutual device for switching of packet domain, system and method

Technical field

The present invention relates to the communications field, relate in particular to a kind of realization circuit domain and the mutual device for switching of packet domain, system and method.

Background technology

In communication process, when circuit domain user is conversed, if the user moves to the another one lane place from a lane place, circuit domain will take place switch, the purpose of switching can also keep professional continuity when being to use the family to move in the position, does not just interrupt user's conversation.Move the lane place crossed over as the user in a MSC compass of competency, being exactly that intra-office switches, when the user moves the scope that the lane place of being crossed over has surpassed a MSC administration, is exactly inter-office switchover, and crossed over two kinds of different networks when user's lane place, be exactly that inter-network is switched.

As shown in Figure 1, be the schematic flow sheet that the circuit domain intra-office switches, as seen from the figure, mainly may further comprise the steps:

Former side BSC1 initiates handover request;

MSC initiates handoff request to target BS C2;

Target BS C2 feeds back switching authentic to MSC after setting up air traffic channel, carries the air interface parameters of order side;

MSC initiates switching command, the air interface parameters of carrying destination to former side BSC1;

Former side BSC1 is destination parameter notice travelling carriage, and travelling carriage switches beginning by former side BSC1 to the MSC feedback;

Behind the switching mobile station to target channel, target BS C2 initiates to switch to MSC and finishes indication;

MSC removes the channel of former side BSC1.

As shown in Figure 2, be circuit domain inter-office switchover schematic flow sheet, as seen from the figure:

The flow process of inter-office switchover on MSC and BSC interface switched identical with intra-office;

Interoffice is by MAP signaling exchange handover relevant information;

After MSC1 receives handover request, initiate handoff request to target MSC 2;

MSC2 returns switching request response to MSC1 after receiving the switching authentic of BSC1;

After target MSC 2 receives that switching is finished, finish by the former side MSC1 switching of MSONCH message informing.

Switch to the inter-network of packet domain (PS territory) in order to realize circuit domain (CS territory), the prior art scheme realizes by the user is routed to packet domain at the all-calls that circuit domain took place: when the user when circuit domain makes a call, switch is routed to packet domain to the calling number of changing by intelligent network, carry out called number analysis again by packet domain, and be routed to called, if owing to moving of user switches, then the user directly forwards one of packet domain initiation to and calls out the switching controls entity, and be responsible for rebuliding and call out being connected of opposite end, and the calling of the original circuit domain of dismantling by the switching controls entity.

Prior art is switched to PS from CS in order to realize, the all-calls that allows the user take place in the CS territory all needs to go to turn around (DTF and MGCF can be remained in the call path) to IP Multimedia System (IMS) territory, causes the serious wasting of resources like this.This scheme has been used intelligent network, makes the operator that does not dispose intelligent network can't enjoy this business.

Summary of the invention

The invention provides a kind of realization circuit domain switches to packet domain, packet domain to circuit domain switches, and circuit domain and the mutual device for switching of packet domain, system and method, in order to solve switching to packet domain from circuit domain of existing in the prior art in order to realize, the mobile subscriber needs to be routed to packet domain at the all-calls that circuit domain takes place, and causes the problem of the wasting of resources.

The inventive method comprises:

A kind of realization circuit domain is characterized in that to packet domain device for switching (FBSC), comprising:

The circuit-domain network interface unit is used to receive the switching message from the circuit domain core network, and the handover information that parses is sent to switch control unit; Reception sends to the circuit domain core network from the switching controls instruction of switch control unit with the switching message of constructing;

The packet field network interface unit is used to receive the switching message from packet field network, will parse handover information and send to switch control unit; Reception sends to packet field network from the switching controls instruction of switch control unit with the switching message of constructing;

Switch control unit is used for:

The handoff request information that receiving circuit territory network interface unit sends, actuating logic are judged, arrive packet domain and circuit domain interface unit according to the judged result sending controling instruction; And by mutual with the follow-up hand off signaling of above-mentioned two interface units, the control handoff procedure.

Described device also comprises the media gateway interface unit, and switch control unit is mutual by this interface and MGW, finishes the operation to the MGW resource.

Described switch control unit also includes user attaching territory query unit, is used to inquire about mobile subscriber's home domain information.

Described user attaching territory query unit, by with the interface of E.164 Number server inquiry mobile subscriber's home domain information.

Described user attaching territory query unit, the allocation list unit of the number of comprising section and home domain also is used to inquire about mobile subscriber's home domain.

Described switch control unit also comprises packet domain switch call initiation unit, is used for initiating switch call by the packet field network interface unit to packet domain.

Described packet field network interface comprises the SIP Signaling Processing Unit, is used to handle packet domain SIP signaling.

Described device, can carry out one of following content or combination:

After receiving circuit domain handoff request message, to the circuit-domain network feedback response message;

Distribute two end points to MGW before sending response, one is used for the connecting circuit territory, and one is used to connect packet domain;

Search the travelling carriage home domain;

Search the step of travelling carriage home domain, comprise one of following content:

By the table lookup of configuration, inquire about by E.164 Number server;

FBSC is parameter with IMSI, to the user ID of E.164 Number server inquiring user in packet domain, is called with user ID then, initiate switch call, in calling, carry IMSI, packet domain session layer network, route calls to called home domain, and be triggered to the switching controls entity;

Initiate switch call by user attaching territory network to application server;

If receive the beared information that comprises travelling carriage in the response message of described calling, then switch and finish to the MSC feedback;

If receive the handover call request message that packet field network is sent, then switch and finish to the MSC feedback;

Beared information in the switch call message of sending according to packet domain upgrades the MGW carrying;

To packet field network feedback MSC beared information;

To packet field network feedback MGW beared information.

A kind of realization packet domain to circuit domain device for switching (FBSC) is characterized in that, comprising:

Switch control unit is used for:

Receive the handoff request information that the packet field network interface unit sends, actuating logic is judged, arrives circuit domain and packet domain interface unit according to the judged result sending controling instruction; And by mutual with the follow-up hand off signaling of above-mentioned two interface units, the control handoff procedure.

Described device also comprises and the travelling carriage interface unit, is used for and the mutual signaling of travelling carriage.

Described user attaching territory query unit, the allocation list of the number of comprising section and home domain also is used for the home domain of inquiring user.

Described device also comprises and switches purpose sub-district and corresponding MSC query unit, is used for inquiry and switches the purpose sub-district, and corresponding MSC address, sub-district.

Described device switches purpose sub-district and corresponding MSC query unit and comprises that also frequency modulation information faces district's allocation list, and this unit switches purpose sub-district and corresponding MSC by this table lookup road.

Described switch control unit also comprises the Handover Number request unit, is used for to circuit domain request Handover Number.

Described switch control unit also comprises circuit domain switch call initiation unit, is used for initiating switch call by the circuit-domain network interface unit to circuit domain.

Described device, can carry out one of following step or combination:

After receiving packet domain handoff request message, initiating with the Handover Number to circuit-domain network is the calling of called number;

Before making a call, inquire about Handover Number to application server by packet network;

Packet domain sends in the handoff request message and carries Handover Number;

In the circuit domain calling procedure, if receive the circuit domain assignment message that MSC sends, then finish response, and send handoff request message to MSC to the assignment of MSC feedback, initiate the intra-office switching flow of circuit-domain network;

After receiving the switching command that MSC sends, send the command messages that switches to circuit domain from packet domain to travelling carriage by packet field network;

After receiving the removing channel command that MSC sends, send handoff completion message to the packet field network application server.

A kind of realization circuit domain and the mutual device for switching of packet domain (FBSC) is characterized in that, comprising:

Switch control unit is used for:

The handoff request information that receiving circuit territory or packet field network interface unit send, actuating logic is judged, arrive packet domain and circuit domain interface unit according to the judged result sending controling instruction, and by mutual with the follow-up hand off signaling of above-mentioned two interface units, the control handoff procedure.

A kind of circuit domain that realizes is used described FBSC to the system that packet domain is switched, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

FBSC is connected with MSC in circuit domain, is used for and the mutual signaling of circuit-domain network;

FBSC is connected with application server in packet domain, is used for and the mutual signaling of packet field network;

The handoff request that FBSC receiving circuit territory network sends realizes the function that circuit domain is switched to packet domain.

Described system, FBSC can also link to each other with media gateway, realizes the operation to media resource.

Described FBSC can also link to each other with E.164 Number server, is used to obtain user's packet domain information.

Described FBSC use SIP signaling and packet field network are mutual.

A kind of system that realizes that packet domain to circuit domain switches uses described FBSC, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

FBSC receives the handoff request that packet field network sends, and realizes the function that packet domain to circuit domain switches.

Described system, FBSC can also with the mutual signaling of travelling carriage.

A kind of system that realizes that packet domain and circuit domain are switched mutually uses described FBSC, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

The handoff request that FBSC receiving circuit territory network sends realizes the function that circuit domain is switched to packet domain; FBSC receives the handoff request that packet field network sends, and realizes the function that packet domain to circuit domain switches.

A kind of method of using above-mentioned FBSC realization circuit-domain network to switch to packet field network, described circuit-domain network comprises MSC and BSC, described packet field network comprises application server and wireless access network, it is characterized in that, may further comprise the steps:

A, Mobile Origination handoff request are triggered to FBSC by MSC with this handoff request;

B, FBSC search the home domain information of described mobile subscriber in packet domain according to the user ID of travelling carriage;

C, application server write down described switching session, and wait for that travelling carriage switches session;

D, described travelling carriage initiate to switch session to application server by packet field network, and the user ID of carrying described travelling carriage;

E, application server are searched precedence record according to the user ID of described travelling carriage, for described mobile subscriber sets up session.

Among the described step B, FBSC also switches to packet domain by MSC notice travelling carriage.

Among described step B and the step D, described mobile user identification is mobile subscriber's circuit domain sign.

Among the described step B, described mobile subscriber's circuit domain sign is mobile subscriber's international mobile subscriber identification code (IMSI) or temporary mobile subscriber identity (TMSI).

Among described step B and the step D, described mobile user identification is the packet domain sign that obtains by the E.164 Number server inquiry according to mobile subscriber's circuit domain sign.

Among the described step B, the user ID of described travelling carriage can be the packet domain sign that constructs in the circuit domain sign according to the user.

Among the described step C, described application server writes down described switching session content and comprises the session identification that switches session, the user ID and the type of call of travelling carriage.

Described step D receives behind the destination switching command at travelling carriage and to initiate.

In the described step e, further comprise according to described record sending conversational response message to FBSC.

Described method also comprises step:

F, application server provide the beared information of travelling carriage to FBSC.

Comprise also in the described step F that FBSC sends road MSC to described beared information.

Described method also comprises step:

G, application server are removed the former calling branch of travelling carriage in packet domain.

Described circuit domain also includes media gateway, among the described step B, also comprises the step of FBSC to two end points of media gateway increase, and described end points is connecting circuit territory and packet domain respectively.

Comprise also in the described step F that FBSC revises the packet domain end points of described media gateway, and be connected with the mobile subscriber.

A kind of method of using above-mentioned FBSC realization circuit-domain network to switch to packet field network, described circuit-domain network comprises MSC and BSC, described packet field network comprises application server and packet domain Access Network, it is characterized in that, may further comprise the steps:

A, FBSC receive handoff request from circuit-domain network;

B, FBSC switch by circuit domain;

C, travelling carriage access to packet field network by the packet domain access network, and by packet field network to the application server initiation session, destination sign and mobile user identification are carried in described session;

D, application server are searched described FBSC according to described destination sign, and to the FBSC initiation session, are carried described mobile user identification;

E, FBSC feed back beared information to application server, and finish session and set up.

FBSC also switches to packet domain by MSC notice travelling carriage among the described step B;

Described step C receives " switching to destination " order back initiation at travelling carriage.

Described circuit domain also includes media gateway, among the described step B, also comprises the step that increases by two end points to media gateway, and described end points is connecting circuit territory and packet domain respectively.

Described method also comprises step:

F, application server are initiated bearer update to calling out the opposite end.

Also comprise the packet domain end points of revising described media gateway in the described step F, and connect in the mobile subscriber.

A kind of method of using above-mentioned FBSC realization packet field network to switch to circuit-domain network, described packet field network comprises application server and packet domain Access Network, described circuit-domain network comprises MSC and BSC, it is characterized in that, may further comprise the steps:

To the FBSC initiation session, notice FBSC switches, and carries mobile user identification and handover information by packet field network for A, mobile subscriber;

B, FBSC obtain Handover Number according to described mobile user identification to application server;

C, FBSC are that called number makes a call to the MSC of circuit-domain network with described Handover Number;

D, MSC route the call to the packet domain application server according to described Handover Number, and connect, and MSC finishes the Calling Side flow process that continues;

E, FBSC initiate circuit domain and switch, and the wait circuit-domain network is set up the destination switching channels;

After F, circuit domain are set up the destination switching channels, by FBSC the parameter of destination switching channels is sent to mobile subscriber terminal from packet domain, mobile subscriber terminal carries out follow-up switching.

In the described steps A, described session comprises that also the caller relevant information is used for FBSC structure circuit domain caller message.

In the described steps A, the method that the mobile subscriber seeks FBSC comprises one of the following:

When the mobile subscriber inserts registration in packet domain, the mobile subscriber is handed down in the FBSC address by packet access network;

The mobile subscriber is to the IMS network registry time, and the positional information of network based access network is handed down to mobile mobile subscriber to the FBSC address.

Among the described step C, FBSC is that called number is initiated the caller session to MSC with the Handover Number.

In the described step e, when switching proceeds to when destination switches, FBSC utilizes the SIP signaling to send to the mobile subscriber this notice.

In the described step F, when FBSC receives that MSC removes former channel command, finish by the switching of SIP signaling application server.

Described method also comprises step:

G, application server are initiated bearer update to FBSC.

A, mobile subscriber initiate to switch to application server by packet field network and carry mobile user identification and handover information;

B, application server distribute Handover Number, and initiate switch call to FBSC, carry mobile user identification, handover information and Handover Number;

C, FBSC make a call according to the MSC of described Handover Number to circuit-domain network;

E, FBSC initiate circuit domain and switch.

Described method also comprises step:

F, user terminal carry out follow-up switching;

G, the original calling branch of removing.

Among the described step B, search the process of FBSC, comprise one of following content:

Directly use the address of having carried FBSC in mobile subscriber's the handoff request message;

The positional information of using when registering by the user is searched;

Search by the user position information of carrying in user's handoff request message.

The invention provides a kind of alternative handoff solution, avoided dependence, avoided route circuitous simultaneously, saved Internet resources intelligent network.

Description of drawings

Fig. 1 is the schematic flow sheet that the circuit domain intra-office switches in the prior art;

Fig. 2 is the schematic flow sheet of circuit domain inter-office switchover in the prior art;

Fig. 3, Fig. 4, Fig. 6 realize the structural representation of circuit domain to the packet domain device for switching for the present invention;

Fig. 5 is that the present invention is the schematic flow sheet of enum server lookup;

Fig. 7 realizes the structural representation of packet domain to circuit domain device for switching for the present invention;

Fig. 8 realizes the structural representation of circuit domain and the mutual device for switching of packet domain for the present invention;

Fig. 9--Figure 12 realizes the system schematic that circuit domain and packet domain are switched mutually for the present invention;

Figure 13--16 is the embodiment of the invention one---schematic flow sheet of embodiment four.

Embodiment

Below in conjunction with Figure of description the specific embodiment of the present invention is described.

Scheme one: realize from circuit domain to the packet domain device for switching:

As shown in Figure 3, be that the present invention program one realizes from circuit domain as seen from the figure, mainly comprising: circuit-domain network interface unit, packet domain interface unit, switch control unit to packet domain device for switching (FBSC).

This circuit-domain network interface unit provides wave point for core net, this device can be linked to each other with core net, that is to say, this interface in strict accordance with the agreement of radio network interface realize (as, with regard to the A interface of emulation GSM, the A interface of CDMA, the IU interface of WCDMA also is like this when linking to each other with the GSM core net), concerning equipment of the core network, equipment of the core network just thinks that FBSC is the access network equipment of a standard.

Switch control unit is used for:

The handoff request information that receiving circuit territory network interface unit sends, actuating logic are judged, arrive packet domain and circuit domain interface unit according to the judged result sending controling instruction.And by mutual with the follow-up hand off signaling of above-mentioned two interface units, the control handoff procedure.

As shown in Figure 4, be the further refined structure of FBSC, as seen from the figure:

Described circuit-domain network interface unit also comprises:

The circuit domain information resolution unit is used to resolve described circuit domain information;

First switches the message sink transmitting element, is used for:

Receiving circuit territory network send other switch message, and described message is sent to switch control unit;

Other are switched message send to circuit-domain network.

Described packet field network interface unit also comprises:

Packet domain information analysis unit is used to resolve described packet domain information;

The SIP Signaling Processing Unit is used to handle packet domain SIP signaling.

Described switch control unit also includes:

User attaching territory query unit is used to accept the query requests of switch control unit, by with the interface of E.164 Number server, to the packet network sign of E.164 Number server inquiring user.The home domain information that has comprised the user in the packet network sign.

This user attaching territory query unit number of being provided with section domain name correspondence table unit is used for the corresponding relation of home domain domain name of number section territory packet domain of configure user circuit domain sign, and switch control unit can find user's home domain according to this table.

As shown in Figure 5, be the schematic flow sheet of enum server lookup.

In this programme, the enum server lookup has method in common:

1, network node carries user's circuit domain sign (e.164 form) to the packet domain user sign of E.164 Number server inquiring user;

2, the enum server is to the packet domain user sign (uri form) of network node feedback user

Described user attaching territory query unit, the allocation list unit of the number of comprising section and home domain also is used for the home domain of inquiring user.

This switch control unit also comprises:

The Handover Number request unit is used for to circuit domain or packet domain request Handover Number.

The packet domain handoff request is initiated the unit, is used for initiating switch call by the packet field network interface unit to packet domain.

As shown in Figure 5, above-mentioned FBSC can also be provided with as required:

The media gateway interface unit is used to accept switch control unit control, to media gateway new bearer more.

With travelling carriage by the signaling interface that packet domain is connected, be used for and the mutual signaling of travelling carriage.

This device in network system to external world incident make following action:

1, receive circuit domain handoff request message after, to the circuit-domain network feedback response message;

Also arrive two end points of MGW distribution send response in first step if 2 FBSC control MGW before, one is used for the connecting circuit territory, and one is used to connect packet domain;

If 3, behind first step, receive the handover call request message that packet field network is sent, then switch and finish to the MSC feedback; Jump to 6 steps

Perhaps: search the travelling carriage home domain;

Wherein search the step of travelling carriage home domain, comprise one of following content:

By the table lookup of configuration, inquire about by E.164 Number server;

FBSC is parameter with IMSI, to the user ID of E.164 Number server inquiring user in packet domain, be called with user ID then, initiate switch call, in calling, carry IMSI, packet domain session layer network routes calls to called home domain with the mechanism of prior art, and is triggered to the switching controls entity;

4, initiate switch call by user attaching territory network to application server;

If 5 receive the beared information that comprises travelling carriage in the response message of described calling, then switch and finish to the MSC feedback;

6, the beared information in the switch call message of sending according to packet domain upgrades the MGW carrying;

7, to packet field network feedback MSC beared information;

8, to packet field network feedback MGW beared information.

Scheme two: realize from the packet domain to circuit domain device for switching

As shown in Figure 6, be that the present invention realizes as seen from the figure, mainly comprising: circuit-domain network interface unit, packet field network interface unit and switch control unit from the FBSC of packet domain to circuit domain switching.

Switch control unit is used for:

Receive the handoff request information that the packet field network interface unit sends, actuating logic is judged, arrives circuit domain and packet domain interface unit according to the judged result sending controling instruction.And by mutual with the follow-up hand off signaling of above-mentioned two interface units, the control handoff procedure.

As shown in Figure 7, described circuit-domain network interface unit also comprises:

Second switches the message sink transmitting element, is used for:

Other are switched message send to circuit-domain network.

Described packet field network interface unit also comprises:

Described switch control unit also includes:

User attaching territory query unit, the home domain information that is used to inquire about the mobile subscriber.

Described user attaching territory query unit, by with the interface of E.164 Number server inquiry mobile subscriber's home domain information.Described user attaching territory query unit, the allocation list unit of the number of comprising section and home domain also is used for the home domain of inquiring user.

The unit is initiated in the circuit domain switch call, is used for initiating switch call by the circuit-domain network interface unit to circuit domain.

Above-mentioned FBSC can also be provided with as required and switch purpose sub-district and corresponding MSC query unit, and be used for inquiry and switch the purpose sub-district, and corresponding MSC address, sub-district.Being provided with of this unit can also can be provided with as follows with reference to the method to set up of facing the cell relation table among the BSC in the prior art:

Switch purpose sub-district and corresponding MSC query unit and comprise that also frequency modulation information faces district's allocation list, this unit by this table lookup to switching purpose sub-district and corresponding MSC.

Following relation list is arranged in the form:

The packet domain sub-district	The circuit domain pilot number	The circuit domain sub-district	The MSC sign
The packet domain sub-district	The circuit domain pilot number	The circuit domain sub-district	The MSC sign	0203	110	0303	46129

This form is an index with packet domain sub-district and circuit domain pilot number, and FBSC can come enquiry form just can obtain circuit domain sub-district and MSC according to these two parameters to have identified

This FBSC can also be provided with as required:

With the travelling carriage interface unit, link to each other by packet domain with travelling carriage, be used for and the mutual signaling of travelling carriage.

FBSC device in the scheme two response of incident to external world is as follows:

Search the travelling carriage home domain;

By the table lookup of configuration, inquire about by E.164 Number server;

Initiate switch call by user attaching territory network to application server;

To packet field network feedback MSC beared information;

To packet field network feedback MGW beared information.

Scheme three: realize packet domain and the mutual device for switching of circuit domain:

As shown in Figure 8, be that the present invention realizes the FBSC that packet domain and circuit domain are switched mutually, as seen from the figure, mainly comprise: circuit-domain network interface unit, packet field network interface unit, switch control unit.

Switch control unit is used for:

At above-mentioned FBSC, the multiple network structure can be arranged, as Fig. 9--shown in 12, be that the present invention realizes the system configuration schematic diagram that circuit domain and packet domain are switched mutually, wherein:

The circuit-domain network of Fig. 9 is a soft-exchange construction, and FBSC controls MGW simultaneously;

The circuit-domain network of Figure 10 is a soft-exchange construction, and FBSC does not control MGW;

The circuit-domain network of Figure 11 is non-soft-exchange construction, and FBSC controls MGW;

If only need switch from packet domain to circuit domain, then can be simplified to Figure 12 shown in structure chart.

Above-mentioned Fig. 9--in the network configuration shown in Figure 12, all standard compliant networking requirement of each interface such as A1, A2.

The following describes the scheme that the present invention realizes that circuit-domain network and packet field network switch mutually.

Scheme four: realize the method that circuit-domain network is switched to packet field network.

In the scheme four, travelling carriage switches to packet domain from circuit domain, in the process of switching, finishes whole process from circuit domain to packet domain device for switching FBSC control by the realization among the present invention program one, comprises following content.

1, FBSC links to each other with circuit domain call controlled entity (MSC), and when the switching of being initiated by the circuit domain Access Network when travelling carriage was delivered to FBSC by MSC, FBSC found the home domain of mobile subscriber in packet domain according to the circuit domain user sign.Home domain network by the mobile subscriber initiates to switch session to application server, proceeds switching flow according to the traditional circuit domain switch method simultaneously.

Described mobile user identification is mobile subscriber's circuit domain sign.It also can be the packet domain sign that obtains by the E.164 Number server inquiry according to mobile subscriber's circuit domain sign.

Described mobile subscriber's circuit domain sign can be mobile subscriber's international mobile subscriber identification code (IMSI) or temporary mobile subscriber identity (TMSI).It also can be the packet domain sign that constructs in the circuit domain sign according to the user.

FBSC also switches to packet domain by MSC notice travelling carriage in the step 1.

The process of searching application server can adopt one of following two kinds of methods:

Method 1: for example user's IMSI is: 460030988889999, FBSC finds this number correspondence in allocation list user attaching territory is: chinaunicom.com, FBSC is called address with 460030988889999@chinaunicom.com so, initiate switch call, packet domain session layer network is with the mechanism of prior art, route calls to called home domain, and be triggered to the switching controls entity: application server.

Method 2:FBSC is parameter with IMSI, to the user ID of E.164 Number server inquiring user in packet domain, be called with user ID then, initiate switch call, in calling, carry IMSI, packet domain session layer network routes calls to called home domain with the mechanism of prior art, and is triggered to the switching controls entity: application server.

Here home domain is a notion of IMS network, be meant user's signatory network, the network of user profile storage, the network of customer service control, in other words: when the user registers, be to carry out alternately with home domain, finish registration process, the user's data of home network storage, the most business of user except local service are controlled by the home domain network, for instance: the user in Shenzhen roams into Guangzhou, be connected to feature capabilitys such as finishing registration and professional control on the network in Shenzhen by the access network in Guangzhou.

Foregoing circuit territory user ID is IMSI in CDMA2000, is IMSI and TMSI among the GSM, as: 460030911112222.

2, application server writes down this switching session, waits for user's switching session.

Application server is responsible in packet domain user's switch call being routed to FBSC, and the content that writes down this switching session is the session id that switches session, user's sign, type of call etc.As: session id is 11111111, and user ID is 460030911112222@huawei.com, and type of call is for switching.

When 3, receiving the order of " switching " to destination when the switching of carrying out according to conventional method proceeds to travelling carriage, travelling carriage inserts packet field network by the packet domain access network, and initiate one by packet field network to application server and switch session, and carry user's circuit domain user sign.

The order that should " switch " to destination, send by MSC, MSC is according to the destination air traffic channel parameter in the handoff request acknowledgement message of destination feedback, the structure switching command message, be delivered to the access network of former side, former side joint is gone into network and is converted into HANDOFF DIRECTION message and issues the mobile subscriber, the mobile subscriber just can switch to the destination network according to the parameter in this message in original technology, but the mobile subscriber directly initiates a caller to packet field network in the present invention, and packet field network utilizes prior art just can be called to application server.

4, application server is searched previous record according to mobile user identification, finishes the session that FBSC initiates.

Mobile Server finds previous record, and this record comprises session identification etc., just can be according to session identification to the opposite end of calling out, and just FBSC sends 200OK message, and FBSC just thinks that having finished session sets up after receiving 200OK message.

5, FBSC finishes according to switching to the MSC feedback, and application server is initiated bearer update to calling out the opposite end simultaneously.Application server is removed the former calling branch of travelling carriage in packet domain.

The more new bearer here, can followingly understand:

Call out for packet domain, calling terminal and called end all have IP address, port numbers to be used to receive the medium that the other side sends over, so for calling both sides, must allow the other side know oneself IP address and port numbers, just can receive the medium that the other side sends, and the requirement of knowing the other side's media resource type is all arranged, so just can be correctly decoded the other side's media information.For instance, the process of media negotiation is such: mobile subscriber A is the IP address, and port, medium type are told the mobile subscriber B, and mobile subscriber B is the IP address, and port, medium type are told the mobile subscriber A, and both sides just can communication like this.

In the such scheme four, if described circuit domain also includes media gateway, then in described step 1, also need to comprise the step of FBSC to two end points of media gateway increase, described end points is connecting circuit territory and packet domain respectively.

The Dui Ying FBSC that also comprises in described step 5 revises the packet domain end points of described media gateway with it, and connects in the mobile subscriber.

Scheme five: realize the method that circuit-domain network is switched to packet field network.

Scheme five has realized that circuit-domain network switches to packet field network, uses and realizes among the present invention program one comprising following content from packet domain to circuit domain device for switching FBSC:

1, FBSC receives handoff request from circuit-domain network, is switched by the circuit domain changing method by FBS, and FBSC switches to packet domain by MSC notice travelling carriage.

When 2, receiving the order of " switching " to destination when switching proceeds to travelling carriage, travelling carriage inserts packet field network by the packet domain access network, and initiate a session to application server by packet field network, and carry and switch the destination sign, and mobile user identification.

Wherein the destination sign is generated by FBSC, is delivered to BSC by MSC, and BSC brings the mobile subscriber by air interface, and network can find FBSC by this destination sign.

Described mobile user identification is mobile subscriber's circuit domain sign, perhaps the packet domain sign that obtains by the E.164 Number server inquiry according to mobile subscriber's circuit domain sign.

3, application server finds FBSC according to switching the destination sign, to the FBSC initiation session, carries mobile user identification.

4, FBSC finishes according to switching to the MSC feedback, feeds back the beared information of MGW simultaneously to application server, and finishes session and set up.

This step is divided into two kinds of situations, 1, FBSC control MGW, in this case, FBSC is distributed in the end points towards packet network among the MGW in the first step, and obtained the beared information of this end points, this step will be notified application server this information, and application server can be notified the mobile subscriber after receiving this information, in order to new bearer more.

5, application server is initiated bearer update to the mobile subscriber, and application server is initiated bearer update to calling out the opposite end.

In the such scheme five, if described circuit domain also includes media gateway, then in the step 1, also comprise the step that increases by two end points to media gateway, described end points is connecting circuit territory and packet domain respectively.Also comprise the packet domain end points of revising described media gateway in the described step 5, and connect in the mobile subscriber.

Scheme six: realize the method that packet field network switches to circuit-domain network.

Scheme six has realized that packet field network switches to circuit-domain network, uses and realizes among the present invention program two comprising following content from packet domain to circuit domain device for switching FBSC:

1, the mobile subscriber to the FBSC initiation session, notifies FBSC to switch by packet field network, carries mobile user identification and handover information.

This step is initiated a SIP session by packet field network to FBSC by the mobile subscriber, and notice FBSC switches, and carries handover relevant information.

Described session can also comprise that the caller relevant information is used for FBSC structure circuit domain caller message.

In this step, the method that the mobile subscriber seeks FBSC comprises one of the following:

2, FBSC obtains Handover Number by packet field network to application server according to mobile user identification.

FBSC searches the method for application server with two methods in the step 1 in the scheme four in this step.

3, FBSC makes a call to MSC according to Handover Number.

FBSC is that called number is initiated the caller session to MSC with the Handover Number.

4, MSC routes calls to packet domain according to Handover Number, and packet domain routes calls to application server, and application server is finished MSC to continuing between the application server, simultaneously the MSC Calling Side of finishing the calling that FBSC the initiates flow process that continues.

5, FBSC utilizes the circuit domain changing method to initiate to switch subsequently, and when switching proceeded to MSC notice FBSC " to the destination switching ", FBSC utilized this notice the SIP signaling to issue the mobile subscriber.

6, the mobile subscriber carries out follow-up switching according to the circuit domain changing method, when switching flow proceeds to FBSC and receives the former channel command of removing of MSC, " switches and finishes " by SIP signaling application server.

FBSC receives that the former channel command of the removing of MSC is a mechanism in the existing handoff technique, this programme utilizes existing handoff technique exactly and interspersed other flow processs realize switching in the centre, so is the same with prior art at FBSC just with signaling between the MSC, only, FBSC is in handling these signaling procedures, carried out alternately in packet domain interface unit and media gateway interface unit and packet domain and media gateway, the purpose of doing like this is need not change existing network just can realize switching.

The switching of notice application server has been finished and can have been passed through a SIP:MESSAGE message informing application server, carry message that switching finished in this message to application server, application server is notified by the bearer update ability of prior art and is called out the opposite end, finishes and calls out the loading establishing process of opposite end to circuit domain.

7, application server is initiated bearer update to calling out the opposite end.

Scheme seven: realize the method that circuit-domain network is switched to packet field network.

Scheme seven has realized that circuit-domain network switches to packet field network, uses among the present invention program one and realizes from packet domain to circuit domain device for switching FBSC.

When the wireless side interface right and wrong IPization of MSC, need to use MGW in the described network configuration.

In scheme four or scheme five, when MSC when FBSC initiate to switch, FBSC, is used for being connected with the carrying of MSC to the MGW specified endpoint according to the circuit number in the message, distributes an end points towards packet domain simultaneously, is used for being connected with the carrying of packet field network.

When receiving or send session with packet domain, with described packet domain end points as beared information.

MSC initiates to switch to BSC, if the A interface is not an IPization, will carry circuit number.

Here MGW is the media gateway device of a standard, as long as FBSC is by the mechanism notice MGW of prior art, MGW just can distribute end points, the requirement of this end points is partly consistent with the circuit number that MSC carries in circuit domain, in packet domain partly is the IP address and the port numbers of a grouping, effect as top narration: one is used for and packet domain is set up carrying, a carrying that is used to set up with circuit domain.

Described packet domain end points can be the IP address as the beared information particular content, port numbers, and medium type.

Scheme eight: the FBSC of operational version one realizes the method that packet field network switches to circuit-domain network.

1, the mobile subscriber initiates to switch to application server by packet field network and carries mobile user identification and handover information.

Described session can also comprise the caller relevant information, is used for FBSC structure circuit domain caller message.

2, application server distributes Handover Number, and initiates switch call to FBSC, carries mobile user identification, handover information and Handover Number.

In this step, search the process of FBSC, comprise one of following content:

The positional information of using when registering by the user is searched;

3, FBSC makes a call according to the MSC of described Handover Number to circuit-domain network.

4, MSC routes the call to the packet domain application server according to described Handover Number, and connects, and MSC finishes the Calling Side flow process that continues.

5, FBSC initiates the circuit domain switching.

When switching proceeds to when destination switches, FBSC utilizes the SIP signaling to send to the mobile subscriber this notice.

6, user terminal carries out follow-up switching.

When FBSC receives that MSC removes former channel command, finish by the switching of SIP signaling application server.

7, application server is initiated bearer update to FBSC, removes original calling branch.

Such scheme four of the present invention---in the scheme eight, also can use among the present invention program three and to realize that packet domain and the mutual device for switching FBSC of circuit domain finish, flow process can same treatment, specifically no longer describes in detail.

See under such scheme of the present invention the example that can specifically implement below.Can use among this embodiment and realize among the present invention program three that packet domain and the mutual device for switching FBSC of circuit domain finish, also can use the FBSC of corresponding scheme one and scheme two to finish separately, no longer segmentation explanation.

Example one: by the process of circuit domain to the packet domain switching.

The network configuration of embodiment one includes MGW, and the mobile subscriber is switched to packet domain from circuit domain.As shown in figure 13, embodiment one mainly may further comprise the steps:

S11, MSC report the measurement result of wireless channel;

S12, BSC initiate to switch to MSC according to facing the order sub-district that district's configuration relation finds;

S13, MSC be to according to the address of purpose cell search to FBSC, and initiate handoff request;

S14, FBSC increase by two end points to MGW, and one is used to connect MSC, and one is used to connect packet domain;

S15, MGW return the media resource allocation result;

S16, FBSC according to user ID IMSI to the application server initiation session; Here this application server can be interoperability gateway IWGW.

S17, application server return Temporary Response;

S18, FBSC feed back switching authentic information to MSC;

S19, MSC initiate switching command message to BSC;

S110, carry out mobile subscriber's packet domain access process;

S111, travelling carriage carry mobile subscriber's circuit domain sign to the application server initiation session;

S112, application server send 200OK message to FBSC and are used to finish the session that FBSC initiates;

S113, FBSC revise the packet domain end points of MGW, are used for being connected with travelling carriage;

S114, MGW feedback is revised the result;

S115, FBSC are to the response of application server feedback 200OK;

S116, FBSC finish to the switching of MSC feedback simultaneously;

S117, MSC initiate former channel and remove flow process;

S118, BSC feedback is removed the result;

S119, application server send 200OK message to travelling carriage and are used to finish Mobile Originated session;

S120, travelling carriage respond to 200OK.

Example two: packet domain to circuit domain switches.

As shown in figure 14, mainly may further comprise the steps:

S21, travelling carriage initiate to switch to FBSC by packet network;

To the application server request and obtain Handover Number, the method for searching application server is with example one by packet network for S22-S25, FBSC;

S26, FBSC are that called number is initiated the caller session to MSC with the Handover Number;

S27, S211, S212, S214, MSC route calls to the application server of packet domain according to Handover Number, and continuing between finishing from MSC to the application server;

S28, S29, MSC be parallel to be finished Calling Side and continues;

S215, S216, S217, S218, S219, FBSC initiate to switch according to the circuit domain changing method, when proceeding to FBSC and receive switching command, by SIP signaling travelling carriage;

S220, S221, S222, S223 are the follow-up flow processs of circuit domain changing method;

S224, FBSC finish to the switching of application server notice by packet field network;

S226, S227, S228, S229, S230, to be application server initiate bearer update to the opposite end of session;

S231 connects circuit domain network partly by the ANC signaling;

S233, the session that FBSC is initiated are replied.

Example three: packet domain to circuit domain switches.

The network architecture of embodiment three is a soft-exchange construction, as shown in figure 15, mainly may further comprise the steps:

S31, travelling carriage by packet network to the application server request and obtain Handover Number;

S32, application server feed back Handover Number to travelling carriage by packet network;

S33, travelling carriage structure caller message are called number with the Handover Number, carry a 1X handover relevant information simultaneously, send to FBSC by packet domain;

Here the method for travelling carriage searching FBSC can have multiple:

Method 1: when travelling carriage inserts registration in packet domain, travelling carriage is handed down in the FBSC address by packet access network.

Method 2: travelling carriage is to the IMS network registry time, and the positional information of network based access network (as cell information) is handed down to travelling carriage to the FBSC address.

Method 3: travelling carriage according to user position information, finds the FBSC address by application server, and is handed down to travelling carriage by response message when the request Handover Number.

S36, FBSC are that called number is initiated the caller session to MSC with the Handover Number;

S37,11,12,14, MSC route calls to the application server of packet domain according to Handover Number, and continuing between finishing from MSC to the application server;

S38, S39, MSC be parallel to be finished Calling Side and continues;

S315, S316, S317, S318, S319, FBSC initiate to switch according to the circuit domain changing method, when proceeding to FBSC and receive switching command, by SIP signaling travelling carriage;

S320, S321, S322, S323 are the follow-up flow processs of circuit domain changing method;

S324, FBSC finish to the switching of application server notice by packet field network;

S326, S327, S328, S329, S330, to be application server initiate bearer update to the opposite end of session;

S331 connects circuit domain network partly by the ANC signaling.

S333, the session that FBSC is initiated are replied

Example four: switch to packet domain by circuit domain.

The network architecture of embodiment four is a soft-exchange construction.As shown in figure 16, mainly may further comprise the steps:

S41, S42, S43, S44, S45, S46, be the switching flow that carries out according to the circuit domain changing method;

S47, after receiving switching command, travelling carriage is linked into packet network by the packet domain access network;

S48, travelling carriage initiate to switch session by packet network to application server;

S49, application server find FBSC according to the information that travelling carriage reports, and send the switching session to FBSC;

S410, S411, S411a, S412, S413, S414, FBSC be to upgrading beared information by MSC to MGW, and the result is reported application server;

S415, S416, S417, be the former channel flow process of removing of circuit domain changing method;

S418, S419 are that application server is replied to finish the Mobile Originated Handover session to travelling carriage.

The invention provides a kind of alternative handoff solution, avoided dependence, avoided route circuitous, saved Internet resources greatly intelligent network.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1, a kind of realization circuit domain is characterized in that to packet domain device for switching (FBSC), comprising:

Switch control unit is used for:

2, device as claimed in claim 1 is characterized in that, also comprises the media gateway interface unit, and switch control unit is mutual by this interface and MGW, finishes the operation to the MGW resource.

3, device as claimed in claim 2 is characterized in that, described switch control unit also includes user attaching territory query unit, is used to inquire about mobile subscriber's home domain information.

4, device as claimed in claim 3 is characterized in that, described user attaching territory query unit, by with the interface of E.164 Number server inquiry mobile subscriber's home domain information.

5, device as claimed in claim 3 is characterized in that, described user attaching territory query unit, and the allocation list unit of the number of comprising section and home domain also is used to inquire about mobile subscriber's home domain.

As claim 1,2 described devices, it is characterized in that 6, described switch control unit also comprises packet domain switch call initiation unit, is used for initiating switch call by the packet field network interface unit to packet domain.

As claim 1,2 described devices, it is characterized in that 7, described packet field network interface comprises the SIP Signaling Processing Unit, be used to handle packet domain SIP signaling.

8, device as claimed in claim 1 is characterized in that, can carry out one of following content or combination:

Search the travelling carriage home domain;

By the table lookup of configuration, inquire about by E.164 Number server;

Initiate switch call by user attaching territory network to application server;

To packet field network feedback MSC beared information;

To packet field network feedback MGW beared information.

9, a kind of realization packet domain to circuit domain device for switching (FBSC) is characterized in that, comprising:

Switch control unit is used for:

10, device as claimed in claim 9 is characterized in that, also comprises the media gateway interface unit, and switch control unit is mutual by this interface and MGW, finishes the operation to the MGW resource.

11, device as claimed in claim 9 is characterized in that, also comprises and the travelling carriage interface unit, is used for and the mutual signaling of travelling carriage.

As claim 9,10 or 11 described devices, it is characterized in that 12, described switch control unit also includes user attaching territory query unit, is used to inquire about mobile subscriber's home domain information.

13, device as claimed in claim 12 is characterized in that, described user attaching territory query unit, by with the interface of E.164 Number server inquiry mobile subscriber's home domain information.

14, device as claimed in claim 13 is characterized in that, described user attaching territory query unit, and the allocation list of the number of comprising section and home domain also is used for the home domain of inquiring user.

15, device as claimed in claim 9 is characterized in that, also comprises switching purpose sub-district and corresponding MSC query unit, be used for inquiry and switch the purpose sub-district, and corresponding MSC address, sub-district.

16, device as claimed in claim 15 is characterized in that, switches purpose sub-district and corresponding MSC query unit and comprises that also frequency modulation information faces district's allocation list, and this unit switches purpose sub-district and corresponding MSC by this table lookup road.

As claim 9,10 or 11 described devices, it is characterized in that 17, described switch control unit also comprises the Handover Number request unit, be used for to circuit domain request Handover Number.

As claim 9,10 or 11 described devices, it is characterized in that 18, described switch control unit also comprises circuit domain switch call initiation unit, is used for initiating switch call by the circuit-domain network interface unit to circuit domain.

19, device as claimed in claim 9 is characterized in that, can carry out one of following step or combination:

Packet domain sends in the handoff request message and carries Handover Number;

20, a kind of realization circuit domain and the mutual device for switching of packet domain (FBSC) is characterized in that, comprising:

Switch control unit is used for:

21, a kind of circuit domain that realizes is used the described FBSC of claim 1 to the system that packet domain is switched, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

22, system as claimed in claim 21 is characterized in that, FBSC can also link to each other with media gateway, realizes the operation to media resource.

23, system as claimed in claim 21 is characterized in that, described FBSC can also link to each other with E.164 Number server, is used to obtain user's packet domain information.

24, system as claimed in claim 21 is characterized in that, described FBSC use SIP signaling and packet field network are mutual.

25, a kind of system that realizes that packet domain to circuit domain switches uses the described FBSC of claim 9, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

26, system as claimed in claim 25 is characterized in that, FBSC can also link to each other with media gateway, realizes the operation to media resource.

27, system as claimed in claim 25 is characterized in that, FBSC can also with the mutual signaling of travelling carriage.

28, system as claimed in claim 25 is characterized in that, described FBSC can also link to each other with E.164 Number server, is used to obtain user's packet domain information.

29, a kind of system that realizes that packet domain and circuit domain are switched mutually uses the described FBSC of claim 20, and described circuit domain comprises MSC and BSC, and described packet domain comprises application server and wireless access network, it is characterized in that:

30, a kind of described device of claim 1 that uses is realized the method that circuit-domain network is switched to packet field network, described circuit-domain network comprises MSC and BSC, described packet field network comprises application server and wireless access network, it is characterized in that, may further comprise the steps:

31, method as claimed in claim 30 is characterized in that, among the described step B, FBSC also switches to packet domain by MSC notice travelling carriage.

32, method as claimed in claim 30 is characterized in that, among described step B and the step D, described mobile user identification is mobile subscriber's circuit domain sign.

33, method as claimed in claim 32 is characterized in that, among the described step B, described mobile subscriber's circuit domain sign is mobile subscriber's international mobile subscriber identification code (IMSI) or temporary mobile subscriber identity (TMSI).

34, method as claimed in claim 30 is characterized in that, among described step B and the step D, described mobile user identification is the packet domain sign that obtains by the E.164 Number server inquiry according to mobile subscriber's circuit domain sign.

35, method as claimed in claim 30 is characterized in that, among the described step B, the user ID of described travelling carriage can be the packet domain sign that constructs in the circuit domain sign according to the user.

36, method as claimed in claim 30 is characterized in that, among the described step C, described application server writes down described switching session content and comprises the session identification that switches session, the user ID and the type of call of travelling carriage.

37, method as claimed in claim 30 is characterized in that, described step D receives behind the destination switching command at travelling carriage and to initiate.

38, method as claimed in claim 30 is characterized in that, in the described step e, further comprises according to described record sending conversational response message to FBSC.

39, method as claimed in claim 38 is characterized in that, also comprises step:

40, method as claimed in claim 39 is characterized in that, comprises also in the described step F that FBSC sends road MSC to described beared information.

41, method as claimed in claim 30 is characterized in that, also comprises step:

42, method as claimed in claim 30 is characterized in that, described circuit domain also includes media gateway, among the described step B, also comprises the step of FBSC to two end points of media gateway increase, and described end points is connecting circuit territory and packet domain respectively.

43, method as claimed in claim 41 is characterized in that, comprises also in the described step F that FBSC revises the packet domain end points of described media gateway, and is connected with the mobile subscriber.

44, a kind of described device of claim 1 that uses is realized the method that circuit-domain network is switched to packet field network, described circuit-domain network comprises MSC and BSC, described packet field network comprises application server and packet domain Access Network, it is characterized in that, may further comprise the steps:

A, FBSC receive handoff request from circuit-domain network;

B, FBSC switch by circuit domain;

45, method as claimed in claim 44 is characterized in that, FBSC also switches to packet domain by MSC notice travelling carriage among the described step B.

46, method as claimed in claim 44 is characterized in that, among described step B and the step D, described mobile user identification is mobile subscriber's circuit domain sign.

47, method as claimed in claim 44 is characterized in that, among described step B and the step D, described mobile user identification is the packet domain sign that obtains by the E.164 Number server inquiry according to mobile subscriber's circuit domain sign.

48, method as claimed in claim 44 is characterized in that, described step C receives " switching to destination " order back initiation at travelling carriage.

49, method as claimed in claim 44 is characterized in that, described circuit domain also includes media gateway, among the described step B, also comprises the step that increases by two end points to media gateway, and described end points is connecting circuit territory and packet domain respectively.

50, method as claimed in claim 44 is characterized in that, also comprises step:

51, method as claimed in claim 50 is characterized in that, also comprises the packet domain end points of revising described media gateway in the described step F, and connects in the mobile subscriber.

52, a kind of described device of claim 9 that uses is realized the method that packet field network switches to circuit-domain network, described packet field network comprises application server and packet domain Access Network, described circuit-domain network comprises MSC and BSC, it is characterized in that, may further comprise the steps:

53, method as claimed in claim 52 is characterized in that, in the described steps A, described session comprises that also the caller relevant information is used for FBSC structure circuit domain caller message.

54, method as claimed in claim 52 is characterized in that, in the described steps A, the method that the mobile subscriber seeks FBSC comprises one of the following:

55, method as claimed in claim 52 is characterized in that, among the described step C, FBSC is that called number is initiated the caller session to MSC with the Handover Number.

56, method as claimed in claim 52 is characterized in that, in the described step e, when switching proceeds to when destination switches, FBSC utilizes the SIP signaling to send to the mobile subscriber this notice.

57, method as claimed in claim 52 is characterized in that, in the described step F, when FBSC receives that MSC removes former channel command, finishes by the switching of SIP signaling application server.

58, method as claimed in claim 52 is characterized in that, also comprises step:

G, application server are initiated bearer update to FBSC.

59, a kind of described device of claim 1 that uses is realized the method that packet field network switches to circuit-domain network, described packet field network comprises application server and packet domain Access Network, described circuit-domain network comprises MSC and BSC, it is characterized in that, may further comprise the steps:

E, FBSC initiate circuit domain and switch.

60, method as claimed in claim 59 is characterized in that, also comprises step:

F, user terminal carry out follow-up switching;

G, the original calling branch of removing.

61, method as claimed in claim 59 is characterized in that, among the described step B, searches the process of FBSC, comprises one of following content:

The positional information of using when registering by the user is searched;