CN101321375B

CN101321375B - Method and server for controlling conversation switch

Info

Publication number: CN101321375B
Application number: CN2007101104474A
Authority: CN
Inventors: 刘壮; 姚忠辉; 侯保花
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-06-06
Filing date: 2007-06-06
Publication date: 2012-12-19
Anticipated expiration: 2027-06-06
Also published as: CN101321375A

Abstract

This invention discloses a method and a server for controlling session switch, belonging to the communication field. The method comprises: collecting session information of a network interface; receiving related information of the switch of the network interface and/or a spare network interface; judging whether it is satisfied with the preparation condition of the switch according to the related informant of the switch, if it is, reserving resource for the session switch according to the collected session information to; judging whether it is satisfied with the switch condition based on the related information of the switch, if it is, then controlling the session to switch between the network interface and/or the spare network interface, and controlling the switched session to use the reserved resource. The server includes: a collecting module of session information, a receiving module, a switch preparation module and a controlling module of session switch. This invention directly uses the reserved preparation to process the session switch when the session is switched through preparing the condition before the session is switched, which realizes the better seamless switch, reduces the delay time and improves the efficiency of session switch.

Description

Method and server that the control session is switched

Technical field

The present invention relates to the communications field, particularly the method and the server of control session switching.

Background technology

Along with developing rapidly and IP and the combination of communicating by letter of communication network; The future communications grid will comprise the complete IP network of various isomery access technologies and heterogeneous network; The network interface of isomery comprises GSM (Global System of Mobile Communication; Global system for mobile communications), GPRS (General Packet Radio Service; GPRS), WCDMA (Wideband Code Division Multiple Access; Broadband demal multiplex (MUX) access), CDMA2000, TD-SCDMA, B3G/4G air interface, IEEE 802 serial radio network interfaces, self-organizing network (Ad Hoc) interface, and satellite and Internet, PSTN (Public Switched Telephon Network, public switch telephone network), ADSL (Asymmetric Digital Subscriber Line; Asymmetrical Digital Subscriber Line) network interface such as; And the overlay area of heterogeneous network tends to overlap each other, and continuity and the omnipresent property of service for realizing customer service need a perfect link layer handoff technique.IEEE 802.21 is in order to address this problem; Make the standard that link layer intelligence can be provided to high level, standard is introduced a MIH (Media Independent Handover, media independent handovers) layer between network layer and data link layer; Through with low layer isomery medium between effect shield the medium isomerism with communicating by letter with reciprocity MIH layer; Make the isomery of lower layer network transparent, and unit's language is provided, be used to formulate handover mechanism high level.

In realizing process of the present invention; The inventor finds at present because the access network of multiple isomery respectively has characteristics; For example authentication mechanism, bandwidth, mobility management mechanism, QoS (Quality of Service; Service quality) mechanism etc., the condition more complicated that session is switched, the time that makes session between distinct interface, switch is long.

Summary of the invention

In order to shorten the time that session is switched, the embodiment of the invention provides a kind of method and server that session is switched of controlling.Said technical scheme is following:

A kind of method of controlling the session switching, said method comprises:

The session information of the mobile management server collection network interface that switches through the control session;

Said mobile management server receives the handover relevant information that send through said network interface and/or idle network interface at first terminal;

Said first terminal judges whether to satisfy the handover preparation condition according to said handover relevant information; If; Then notify said mobile management server to arrive said handover preparation condition, and said mobile management server is a session handoff reservation resource according to collected session information informing network equipment;

Said first terminal judges whether to satisfy switching condition according to said handover relevant information; If; Then notify said mobile management server to reach said switching condition; And the session of said mobile management server controls is switching to the said network equipment through said network interface and/or idle network interface, and said reserved resource is used in the session after control is switched.

Further, the embodiment of the invention also provides a kind of server, and said server is used to control session and switches, and specifically comprises:

The session information collection module is used for the session information of collection network interface;

Receiver module is used to receive the handover relevant information that send through said network interface and/or idle network interface at first terminal;

The handover preparation module is used for when handover relevant information that said receiver module receives satisfies the handover preparation condition, is session handoff reservation resource according to corresponding network device in the collected session information informing network;

Session switching controls module; Be used for when handover relevant information that said receiver module receives satisfies switching condition; Control said network interface of conversation informing and/or idle network interface switch to the said network equipment, and said reserved resource is used in the session after control is switched.

The embodiment of the invention is provided with the server that a control session is switched on network;, session makes resource reservation preparation before switching through this server; When session is switched, directly utilize pre-prepd resource to carry out session and switch, can realize more excellent seamless switching; Reduce time of delay, improve the efficient that session is switched.

Description of drawings

Fig. 1 is the sketch map that business that the embodiment of the invention 1 provides is switched between different terminals;

Fig. 2 is the another kind of sketch map that business that the embodiment of the invention 1 provides is switched between different terminals;

Fig. 3 is the sketch map that business that the embodiment of the invention 1 provides is switched between the network interface of the different mode at same terminal;

Fig. 4 is the method flow diagram that the control session that provides of the embodiment of the invention 1 is switched;

Fig. 5 is the network structure based on the Internet application that the embodiment of the invention 2 provides;

Fig. 6 is the information interaction figure that the control session that provides of the embodiment of the invention 2 is switched;

Fig. 7 is that the another kind that the embodiment of the invention 2 provides is controlled the information interaction figure that session is switched;

Fig. 8 is the session mobility control structure figure based on the IMS network that the embodiment of the invention 3 provides;

Fig. 9 is the information interaction figure that the control session that provides of the embodiment of the invention 3 is switched;

Figure 10 is that the another kind that the embodiment of the invention 3 provides is controlled the information interaction figure that session is switched;

Figure 11 is the server architecture figure that the embodiment of the invention 4 provides.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.

The embodiment of the invention is switched the previous crops preparatory condition through session, when carrying out the session switching, directly utilizes the condition of preparing to switch, and has shortened the time that session is switched.

Embodiment 1

Present embodiment provides a kind of method that session is switched of controlling, and session is switched between distinct interface and had 3 kinds of situation:

Referring to Fig. 1, business is switched between 2 different terminals, and 2 terminals have the SIM of oneself;

Referring to Fig. 2, business is switched 1 SIM of 2 terminals share between 2 different terminals;

Referring to Fig. 3, multimode terminal, business is switched between the interface of 2 different modes at same terminal.

The method that this control session is switched comprises:

The session information of collection network interface; Receive the handover relevant information of network interface and/or idle network interface;

Judge whether to satisfy the handover preparation condition according to handover relevant information, if be session handoff reservation resource then according to collected session information; Judge whether to satisfy switching condition according to handover relevant information, if, then to control session and between network interface and/or idle network interface, switch, reserved resource is used in the session after control is switched.

The handover relevant information here comprises: the success that network interface and/or idle network interface are sent is provided with the notification message of handover preparation condition and switching condition, the incident that the handover preparation condition of setting and switching condition are corresponding etc.

When realizing said method; At first in network, increase the server that a control session is switched, present embodiment is specially session mobility management server SMM-SERVER (SMM, Session Mobility Management); Referring to Fig. 4, this conversation switching method specifically may further comprise the steps:

Step 101: after starting up of terminal was reached the standard grade, registration oneself was online in SMM-SERVER.

Step 102: when the initiation session of terminal; SMM-SERVER collects the information of this session through network; The information of session comprises the session self-information, and for example session identification or addressing etc. also comprises SDP (the Session DescribeProtocol that consult at the session two ends; Session Description Protocol) information, for example media combination mode, host-host protocol or port numbers etc.

Step 103:SMM-SERVER promptly subscribes to session handover preparation condition and switching condition to information and data that terminal subscribes needs.

The subscription here is specifically to send out information and the data that the request mode subscription needs; The terminal is transmitted to request the purpose network interface of subscription; The purpose network interface can be the present networks interface; Also can be the network interface that leaves unused or the network interface of current sessions, also can subscribe to simultaneously to the idle network interface and the network interface of current sessions.Dual-mode terminal for example, server also can be to the pattern subscription information of not carrying out session, at this moment, need the network interface of current sessions to transmit the information and the data of subscription needs.Present embodiment adopts to the network interface of current sessions and subscribes to.

The handover preparation condition that SMM-SERVER subscribes to is two different threshold values with switching condition; This threshold values can be when the signal strength signal intensity threshold values of front port, preset network bandwidth threshold values, preset service quality threshold values, preset network cost performance threshold values or preset service ability threshold values etc.; Perhaps new interface detects the network of better signal quality; And it is better to a degree than original signal; Perhaps new interface finds that a network satisfies user's hobby setting, the perhaps combination in any of above factor.Certainly the threshold values degree of switching condition will be higher than the threshold values of handover preparation condition.

The information that SMM-SERVER subscribes to can be MIH information, i.e. the information of 802.21 media independent handovers, and the broadcast message of perhaps subscribing to access device or gateway triggers the threshold values information of each service logic etc.

Illustrate, the information that present embodiment SMM-SERVER subscribes to is MIH link-going-down (the signal strength signal intensity dropping signal that is connecting), MIH link-down (connection interrupt signal) or MIH link-up (connection commencing signal) information of signal strength signal intensity.

The mechanism of subscribing notification, switching controls are accomplished to MIH layer subscription information through SMM-SERVER and are switched the triggering of preparing, switching, and then do corresponding operation.

This subscription procedure can be responsible for by the MIH layer, utilizes the mechanism of MIH itself, is responsible for sending subscribe message and receiving notice message by the MIH layer that is:, triggers the application layer operation then; Also can directly send subscribe message and receiving notice message, that is: transmit through the mode of application layer encapsulation MIH information by application layer; Also can the MIH information mapping be become the application layer protocol parameter, transmit through the mode of expanded application layer protocol.Perhaps with the combination in any of upper type.

Step 104: the terminal judges whether to satisfy session handover preparation condition through detection, if satisfy execution in step 105; Otherwise execution in step 112 continues original session.This detection can also can be accomplished by idle network interface by just accomplishing at the network interface of session in the terminal, and mainly by the subscription procedure decision, the session handover preparation condition that SMM-SERVER to which network interface subscribes to just by which interface is detected.So present embodiment is just detected at the network interface of session by current.

Session handover preparation condition refers to network condition and changes, and the information in this variation is subscribed to by SMM-SERVER in advance.

Step 105: terminal notice SMM-SERVER has arrived session handover preparation condition.

This notice can be by just accomplishing at the network interface of session in the terminal; Also can accomplish by idle network interface; Mainly by the decision of the testing process in the step 104, if the detection in the step 104 by just carrying out at the network interface of session, then this notice is also undertaken by this interface; If the detection in the step 104 is undertaken by idle network interface, then this notice is undertaken by this idle network interface.So present embodiment is just notified at the network interface of session by current.

After step 106:SMM-SERVER is notified, initiate to switch preparation, promptly notify the corresponding network device reserved resource.The network equipment here comprises access device or gateway etc.

SMM-SERVER will take all factors into consideration session information collected in the step 102; And user preference information and operator's information configured; Predict next can switch after a period of time, then be beforehand with preparation at network side for this session switching, to reduce the delay of switching.For example, can do the preparation of resource reservation in advance.

The concrete implementation procedure of the step 104 in the present embodiment to step 106 is:

At first the interface at terminal detects network conditions and changes, and MIH link-going-down information has for example taken place because SMM-SERVER to terminal subscribes this information, terminal notice SMM-SERVER then, this information of being about to sends to SMM-SERVER;

If the process of subscription information is responsible for by the MIH layer, after this information is notified SMM-SERVER, be responsible for the notification applications layer by the MIH layer of SMM-SERVER, trigger and prepare change action accordingly in advance; If directly subscribed to this information through application layer protocol to the application layer at terminal by the application layer of SMM-SERVER; The then subscription of this information, notification procedure can encapsulate MIH information by application layer and accomplish; Also can accomplish through the expanded application layer protocol through MIH unit language being mapped to the parameter of application layer protocol.

It is that example describes that the subscription procedure of present embodiment is subscribed to the MIH layer.

Step 107: the terminal detects whether satisfy the session switching condition, if, execution in step 108; Otherwise, execution in step 111.

This detection can be by just accomplishing at the network interface of session in the terminal; Also can accomplish by idle network interface; Mainly by the decision of the testing process in the step 104, if the detection in the step 104 by just carrying out at the network interface of session, then the detection in this step is also undertaken by this interface; If the detection in the step 104 is undertaken by idle network interface, then the detection in this step is undertaken by this idle network interface.So present embodiment is just detected at the network interface of session by current.

Usually set ageing time T second as the case may be; If passed through T second, still do not satisfy the session switching condition, not think that then need carry out session switches; Notice MIH event-rollback message is given SMM-SERVER, requires SMM-SERVER to carry out the state rollback.Change the session handoff trigger condition that reaches the SMM-SERVER subscription if T detects network condition in second, then notify SMM-SERVER to carry out session and switch.

Network condition variation in the present embodiment is specially MIH link-down or MIH link-up information, and MIH link-down or MIH link-up information are sent to SMM-SERVER.Because the subscription procedure of present embodiment is subscribed to for the MIH layer,, trigger corresponding warming-up exercise so after above-mentioned information is notified SMM-SERVER, be responsible for the notification applications layer by the MIH layer of SMM-SERVER;

If the process of subscribing to above-mentioned information is directly subscribed to through application layer protocol to the application layer at terminal by the application layer of SMM-SERVER; Then the notification procedure of this moment can encapsulate MIH information by application layer and accomplishes; Perhaps, accomplish through the expanded application layer protocol through MIH unit language being mapped to the parameter of application layer protocol.

Step 108: terminal notice SMM-SERVER has arrived the session switching condition.

After step 109:SMM-SERVER is notified, initiate and control session switching, the notice corresponding network device is used reserved resource.

Step 110: session is broken off original session after switching completion, and the notice corresponding network device discharges the resource that original session takies.

Step 111: return to and switch preparation state before, for example, the notice corresponding network device discharges reserved resource.

Step 112: continue original session.

Embodiment 2

The method that present embodiment provides another kind of control session to switch; Below to be applied as example based on Internet; When portable terminal uses the Internet service, possibly switch to another AP from an AP (Access Point, access point); Perhaps switch to another AR from an AR (Access Router, couple in router).When if 2 layers (link layer) switching only takes place, possibly need to initiate new resource reservation process; Switch if 3 layers (network layer) only takes place, move IP if use, it is transparent that IP changes session, does not move IP if do not use, and then the session addressing needs to change; If 2 layers, 3 layers switching take place simultaneously, then possibly need to initiate new resource reservation process, move IP if use, then the variation of IP is transparent to session, does not move IP if do not use, then the session addressing needs to change.

Can referring to Fig. 5, be the network structure of using based on Internet through controlling the handoff procedure of session under above situation at SMM-SERVER of adding on the network; SMM-SERVER links to each other with network, links to each other with access device through network, and access point mainly is the inlet of information; Make the user can revise the setting of the user preferences of oneself, two Access Networks are arranged among the figure, be respectively Access Network 1 and Access Network 2; Session will switch to interface 1 from interface 2, by interface 1 and Correspondent Node session.Wherein, application layer can be HTTP (Hyper Text Transport Protocol, a Hypertext Transfer Protocol); RTSP (Real Time Streaming Protocol; Real-time streaming protocol), FTP application layer protocols such as (File Transport Protocol, FTPs); Transport layer can be TCP (a Transport Control Protocol transmission control protocol), UDP (User Data Protocol, User Data Protocol), RTP transport layer protocols such as (Real-time Transport Protocol, RTPs).

The network configuration that provides with Fig. 5 is an example, and referring to Fig. 6 and Fig. 7, the method step that concrete control session is switched is following:

Step 201: interface 2 carries out session with Correspondent Node.

Step 202:SMM-SERVER through receiving and transmitting the information that the mode of setting up session signaling is collected current session, comprises session identification, session addressing information, information such as session SDP in the process that current session is initiated.

Step 203:SMM-SERVER sends the request that subscribed network detects incident to interface 2.

Specifically can directly send the request that subscribed network detects incident, also can send the request that subscribed network detects incident to interface 1, or send the request that subscribed network detects incident to interface 1 and interface simultaneously through interface 2 to interface 2.It is that example describes to the request that interface 1 sends subscribed network detection incident that present embodiment adopts through interface 2.Because be the network measuring incident of subscribing to, so the detection of back, notice will be by interface 1 completion to interface 1; Otherwise, accomplish by interface 2.

SMM-SERVER becomes the MIH information description form of XML (EXtensible Markup Language, extensible markup language) earlier, subscribes to through the mode of these information of application layer protocol encapsulation.SMM-SERVER also can transmit the solicited message that subscribed network detects incident through the mode of expanded application layer protocol; The perhaps registration of the MIH interlayer through two entities mechanism of the subscribing to incident of subscribing to the detection network itself; When receiving the request of subscribing to the detection network event; Through the MIH layer notice is sent to the MIH message processing module of SMM-SERVER, the application layer that triggers SMM-SERVER by the MIH layer of SMM-SERVER is then handled according to service logic accordingly.The present embodiment events subscribed is a MIH link-going-down information, and MIH link-going-down information description is become the XML form.

Step 204: interface 1 is provided with after receiving that subscribed network detects the request of incident, will subscribe to success response and send to SMM-SERVER.

Step 205: interface 1 detects the incident that satisfies the handover preparation condition, sends the notice of the incident generation of handover preparation condition to SMM-SERVER.

MIH link-going-down information for having taken place in the handover preparation condition in the present embodiment.

After the notice that the incident of handover preparation condition of obtaining step 206:SMM-SERVER takes place, the request access device carries out resource reservation.

After SMM-SERVER obtains the notice of handover preparation conditional event generation; Judge that session can take place in the following certain hour switches; Take all factors into consideration session information collected in the step 202; And after the information such as user preferences, operator's network configured selection, SMM-SERVER reserves to the access device request resource.

Step 207: after access device is received above-mentioned request, carry out resource reservation, will give SMM-SERVER to the resource reservation sign notice of new session then.

Step 208: whether interface 1 detects to satisfy in ageing time and switches occurrence condition, if satisfy execution in step 209; Otherwise, execution in step 209 '.

Step 209: interface 1 will notify SMM-SERVER to satisfy the switching occurrence condition.

After step 210:SMM-SERVER is notified, initiates and control session and switch, notice is used reserved resource, the session of setting up Correspondent Node and interface 1, and after completion is switched in session, execution in step 211.

The session of step 211:SMM-SERVER de-interfaced 2 and Correspondent Node, and notice discharges the shared resource of former session.

Step 209 ': interface 1 will notify SMM-SERVER to carry out the incident rollback.

Step 210 ': after SMM-SERVER receives the notice of incident rollback, will apply for just now that to the access device request reserved resource discharges.

Step 211 ': after access device is received the request that discharges resource, discharge reserved resource, and send the release response of successful to SMM-SERVER.

Embodiment 3

To use SIP (Session Initiated Protocol; Session initiation Protocol) is applied as example; Can on IMS (IP Multimedia Subsystem, IP Multimedia System) network, add SMM-AS (Application Server, application server) and realize session mobility control.IMS is a standards system based on SIP that is independent of access technology, and it provides a kind of and Access Network core network independently mutually.Referring to Fig. 8; Be session mobility control structure figure based on the IMS network; Comprising terminal UE, P-CSCF (Proxy Call Session Control Function; Proxy Call Session Control Function), I-CSCF (Interrogating Call Session Control Function; The critical point CSCF), HSS (Home Subscriber Server, home subscriber server), S-CSCF (Serving Call Session Control Function, service call conversation control function), SMM-AS and DB (Date Base database).

Present embodiment provides a kind of conversation switching method based on the IMS network; Should on the IMS network, add the server that SMM-AS switches as the control session; The terminal UE post-registration of reaching the standard grade; SMM-AS will know the terminal interface addressing information, terminal UE authentication information etc., and the terminal UE registration process is the same with existing IMS flow process.

Referring to Fig. 9, Figure 10, concrete session switch step is following:

Step 301: after the terminal UE registration is accomplished; To carry out session through interface 2 and Correspondent Node, SMM-AS through receiving and transmitting the information that the signaling method of setting up session is collected current session, comprises session identification in the process that current session is initiated; The session addressing information, information such as session SDP.

Step 302:SMM-AS is to the incident of the interface 2 subscribed networks detection of terminal UE.Events subscribed comprises detection to network state, signal strength signal intensity etc.

The present embodiment employing is that example describes to the request that interface 2 sends subscribed networks detection incidents, also can send the request of subscribed network detection incident to interface 1 through interface 2, or detects the request of incident simultaneously to interface 1 and interface transmission subscribed network.

Can shine upon MIH information through the field that expansion SDP describes attribute, or subscribe to, the incident that the mechanism that the registration of MIH interlayer that also can be through two entities itself is subscribed to is subscribed to the detection network through these information of SIP encapsulation.

Step 303: interface 2 sends subscribes to success response to SMM-AS.

Step 304: the interface 2 of terminal UE detects in real time, when detecting the incident that satisfies the handover preparation condition, sends the notice that satisfies the handover preparation condition to SMM-AS.

After step 305:SMM-AS receives the notice that satisfies the handover preparation condition; Be combined in switching laws such as the user preferences that disposes among the SMM-AS, network selecting etc.; Judge that session can take place in the following certain hour switches; SMM-AS can will comprise that the resource reservation request of SDP sends to PDF according to the information of this session of collecting and keeping;

This request of step 306:PDF authentication, and SDP is mapped to the IP qos parameter, to new gateway GW application resource reservation.

Step 307: after gateway GW receives application, carry out resource reservation.

Step 308: after the reserved resource success, gateway GW sends the resource reservation sign to PDF.

Step 309:PDF transmits the resource reservation sign to new session to SMM-AS.

Step 310: interface 2 detects the incident that satisfies switching condition in ageing time.

Step 311: the incident that interface 2 will satisfy switching condition sends to SMM-AS.

Step 312:SMM-AS can initiate and control the process that session is switched; Set up the session of Correspondent Node and interface 1; And notify the use reserved resource, session is broken off the original interface and the session of Correspondent Node after switching completion, and notifies the release resource that former session takies.

Step 310 ': interface 2 does not detect the incident that satisfies switching condition in ageing time.

Step 311 ': interface 2 sends to SMM-AS with the message of state rollback.

Step 312 ': SMM-AS can discharge the reserved resource of applying for according to session just now through PDF to gateway requests.

When step 302 is during to incident that interface 1 subscribed network detects, the detection of back and notice then are responsible for execution by interface 1, when step 302 be during to incident that interface 2 subscribed networks detect, and the detection of back and notifying then by interface 2 responsible execution.If when all subscribed network detected incident, the detection of back and notice were by interface 1 and interface 2 common responsible execution to interface 1, interface 2.

The method that the control session that above embodiment provides is switched is prepared through before session is switched, making resource reservation, when session is switched; Directly utilize the resource of preparation in advance to carry out the session switching; Can realize more excellent seamless switching, reduce time of delay, improve the efficient that session is switched.

Embodiment 4

Referring to Figure 11, present embodiment provides a kind of server, comprising:

Session information collection module 401 is used for the session information of collection network interface;

Receiver module 402 is used to receive the handover relevant information of network interface and/or idle network interface;

Handover preparation module 403 is used for when the handover relevant information of receiver module 402 receptions satisfies the handover preparation condition, is session handoff reservation resource according to corresponding network device in the collected session information informing network; The network equipment here comprises access device or gateway etc.

Session switching controls module 404 is used for when the handover relevant information of receiver module 402 receptions satisfies switching condition, and the control session is switched between above-mentioned network interface and/or idle network interface, and reserved resource is used in the session after control is switched.

Further, server also comprises:

The resource release module when being used in Preset Time, not satisfying switching condition, is notified above-mentioned network equipment cancellation reserved resource; And break off former session after the session switching completion, notify the above-mentioned network equipment to discharge the resource that former session takies.

Further, server also comprises:

Setting module is used to set handover preparation condition and switching condition.

Wherein, this server also comprises:

The subscribe request transmitting element is used for sending the request of subscribing to handover preparation condition and switching condition to network interface and/or idle network interface.

Above-mentioned server also comprises:

Memory cell is used for the session information that store session information gathering module is collected, and session handover preparation condition in the setting module and switching condition information.

Handover preparation module 403 is specifically responsible for session switching controls module 404 and is resolved signaling, the data of collecting, and calculates the data that need.Specifically also be responsible for to other network element initiation session handover preparation request like handover preparation module 403, receive the session that other network elements return and switch replying of preparation etc.

Can deposit a database in the memory cell, be used to allow the relevant switching hobby rule of application of user's modification oneself, for example expense is regular, service regulation; Allow operator to revise dependency rules such as network selecting.The information that initialization module receives comprises the announcement information that other modules are sent; Session identification, addressing information and the SDP information of collecting; And to the resource description information of other module applications.

Database is specifically responsible for bank switching preparation block 403 and session switching controls module 404 calculated result data; The perhaps data of pilot process, the perhaps data that send over of other network elements, perhaps need buffer memory and etc. pending data; And user preference data, operator's data; These data comprise information such as user terminal identification, terminal ability information, network identity, type, attribute; Can also comprise that user preference information, carrier network select the information and the data of relative dynamic such as relatively-stationary information such as dependency rule and data, session label information, session addressing information, session SDP, new session addressing information; That also can the buffer memory initialization module send but the signaling of failing in time to handle, data etc., or buffer memory need mail to other module but the order of the new generation of failing in time to handle, data etc.

After the server that present embodiment provides is arranged on the network; Before session is switched, can make resource reservation through this server prepares; When session is switched, directly utilize the resource of preparation in advance to carry out the session switching, can realize more excellent seamless switching; Reduce time of delay, improve the efficient that session is switched.

Above embodiment is through when reaching the handover preparation condition, and the session handoff reservation resource for taking place waits when reaching switching condition earlier, directly carries out session and switches, and use reserved resource.Improve switching efficiency like this, realized more excellent seamless switching, reduced time of delay.

All or part of step in the said method can be accomplished through the commands for controlling relevant hardware, and this instruction can be stored in the storage medium, in the hard disk and internal memory of storage medium such as computer or server.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. control the method that session is switched for one kind, it is characterized in that said method comprises:

2. the method that control session as claimed in claim 1 is switched is characterized in that, also comprises before judging whether to satisfy the switching condition step according to said handover relevant information said:

Judge whether to surpass the scheduled time,, then discharge said reserved resource if surpass.

3. the method that control session as claimed in claim 1 is switched is characterized in that the session information step of said collection network interface specifically comprises:

The session information of the mode collection network interface of mode through extensible markup language form, expanded application layer protocol or expansion Session Description Protocol.

4. the method that control session as claimed in claim 1 is switched is characterized in that said session information specifically comprises:

Session identification, addressing information or session description information.

5. the method that control session as claimed in claim 4 is switched is characterized in that the step of the handover relevant information of said network interface of said reception and/or idle network interface comprises:

Send the request of subscribing to handover preparation condition and switching condition to said network interface and/or idle network interface;

After said network interface and/or idle network interface are received described request, from described request, extract said handover preparation condition and switching condition, as monitor message, and notify said server to subscribe to success said handover preparation condition and switching condition.

6. the method that control session as claimed in claim 5 is switched; It is characterized in that the step of the request of said transmission subscription handover preparation condition and switching condition is specifically transmitted the request of subscribing to handover preparation condition and switching condition through the mode of extensible markup language form, expanded application layer protocol or the mode of expansion Session Description Protocol.

7. the method that described control session is switched like arbitrary claim in the claim 1 to 6 is characterized in that said handover preparation condition and switching condition comprise:

In preset signal strength signal intensity threshold values, preset network bandwidth threshold values, preset service quality threshold values, preset network cost performance threshold values or the preset service ability threshold values one or multinomial.

8. a server is characterized in that, said server is used to control session and switches, and specifically comprises:

9. server as claimed in claim 8 is characterized in that, said server also comprises:

The resource release module when being used in Preset Time, not satisfying switching condition, notifies the said network equipment to discharge said reserved resource; And break off former session after the session switching completion, notify the said network equipment to discharge the resource that former session takies.

10. server as claimed in claim 8 is characterized in that, said server also comprises:

11. server as claimed in claim 8 is characterized in that, said server also comprises:

12. server as claimed in claim 10 is characterized in that, said server also comprises:

Memory cell is used to store the session information that said session information collection module is collected, and session handover preparation condition in the setting module and switching condition information.