CN101083833A - Terminal and method for realizing seamless switching among different communication network - Google Patents
Terminal and method for realizing seamless switching among different communication network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
- H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
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- H—ELECTRICITY
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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Abstract
The present invention provides a terminal and method that realizes the seamlessly switch between the IMS network domain and the CS domain network, It could conducted real-time detection of the network condition and switch the communication network when the switching strategy is satisfied. So the continuous conversation during the switch could be ensured. It would also provide technical support to IMS domain network that orients at a variety of access technologies and uses SIP as a session control protocol, and provide the effective technical guarantee for the further development of FMC.
Description
Technical field
The present invention relates to the communication network handoff technique, be meant the terminal and the method that between different communication network, realize seamless switching especially.
Background technology
Along with development of Communication Technique, realize the fusion of communication service and the fusion of communication network by various puppy parcs, become the direction of development, its purpose makes that exactly telex network is convenient.
IP Multimedia System (IMS) towards multiple access technology, IP-based multimedia service and session control core network, possessed the convergent point " IP " of technological incorporation and the convergent point " multimedia " of integrated services simultaneously, and be suitable for fixing-move fusion (FMC), thereby become the core of integration technology of future generation.IMS is the common platform that is defined and developed the perfect various fused business of support by a plurality of normal structures, do not rely on any access technology and access way, and adopt Session Initiation Protocol and standardized open interface flexibly, irrelevant with access, support global system for mobile communications or GPRS (GSM/GPRS), Wideband Code Division Multiple Access (WCDMA) (WCDMA), code division multiple access to insert (CDMA2000), Wireless Fidelity (WiFi) technology and World Interoperability for Microwave Access, WiMax (WiMAX) and wait other broadband wireless technology.
In the prior art, unauthorized based on 3rd Generation Partnership Project (3GPP) general access network standard moves access (UMA) technology, support voice and data from mobile network to the WLAN (wireless local area network) or the bumpless transfer of metropolitan area network, thereby can and exempt to authorize spectrum technology to obtain mobile voice, data, services by the IP broadband access.UMA is the access technology that is applicable to that mobile/WiFi (IEEE802.11 standard) merges, can provide by non-authentication radio-frequency technique access GSM and GPRS and move the scheme of service, the standard of support comprises WiFi (IEEE802.11 standard) and bluetooth (IEEE802.15 standard) etc.
By the UMA technology, the user uses multi-module mobile terminal, can be implemented in free-roaming and conversion between mobile network and public and privately owned WLAN, can obtain consistent continuously mobile voice, data, services experience simultaneously when network switch.In connection procedure, portable terminal is by broadband IP Access Network contact UMA network controller (UNC), by being authorized to after the authentication by non-authenticate wireless access to netwoks GSM voice and GPRS data service; If checked and approved, the user's current position information that is stored in core net is updated, and all voice-and-data business that mail to the current point of mobile device by the mobile Access Network of non-authentication (UMAN) will be routed to wireless access network (RAN).
There is following shortcoming in the UMA technology:
1, the UMA technology is a kind of technology that inserts on the aspect, WLAN (wireless local area network) or metropolitan area network system are linked in the 2G core net of GSM/GPRS simply, therefore just to the repairing of existing GSM/GPRS 2G network, can't satisfy the user demand and the mobile service that enhancing is provided in future.
Integrality requirement when 2, having introduced UNC in the UMA scheme and handle authentication, encrypt and satisfy the voice-and-data transmission, described UNC is similar to the base station sub-system (BSS) in the gsm system.Above-mentioned UMA scheme has brought the lot of data flow for the GSM/GPRS core net, the main entity that causes existing GSM/GPRS network, as Mobile Switching Center Server (MSC), Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (GGSN) etc., must dilatation even more bring and satisfy extra demand, so just offset the UMA scheme to the existing few advantage of GSM/GPRS network change, caused carrying out that its cost exceeds much than IMS scheme on the contrary under the situation that large-scale consumer disposes.
3, UMA considers less for enterprise customer's demand.Places such as enterprises and public WiFi focus adopt WLAN (wireless local area network) or metro gateway and AAA model to insert usually, differ greatly with the UMA access way, thereby the user can't use local radio access node (AP) to insert.Though and the UMA scheme provides the switching between GSM/GPRS and the WiFi, do not support the switching between many AP, for using, large-scale enterprise has serious problem.
In addition, the handover scheme of UMA is to be based upon on the basis that terminal and network all meet the UMA framework, and end side and network side ensure the reliability and the continuity of handoff procedure.Than higher, but CS part and WiFi in the terminal partly are coupled tighterly the scheme of UMA to the requirement of terminal, and the general terminal that all needs to develop new support UMA agreement realizes.
Summary of the invention
In view of this, the invention provides a kind of terminal that between different communication network, realizes seamless switching, can realize the switching between CS territory network and the IMS territory network.
The present invention also provides a kind of method that realizes seamless switching between different communication network, can realize the switching between CS territory network and the IMS territory network.
Technical scheme provided by the invention is specific as follows:
The invention provides a kind of communication terminal of switching between the different communication network realized, comprise configuration management element, network communication unit and conversation and switch unit, wherein,
Configuration management element is used to preserve the configuration information of each unit, and carries out information interaction with each unit;
Converse and switch unit, the Man Machine Interface of CS and IMS phone is provided, finish the call function of CS and IMS phone, be used to receive the switching notice of network communication unit, and send hand off signaling to network side by network communication unit;
Network communication unit is handled signaling and speech data according to CS territory and IMS field network communication agreement, is used for determining switching time according to the switchover policy of detected communication network information and setting, and notice conversation and switch unit; The hand off signaling of conversing and switch unit sends is sent to network side.
In the described terminal, comprise handover module, circuit switching (CS) phone module and IP Multimedia System IMS phone module in described conversation and the switch unit, link to each other with configuration management element respectively, wherein,
Handover module is used for oneself state informing network communication unit with the control detection strategy, and after the switching notice of receiving from network communication unit, control CS phone module and IMS phone module communicate and handover operation; CS phone module and IMS phone module send by network communication unit hand off signaling to network side;
The CS phone module carries out information interaction by described network communication unit and CS territory network; And and the IMS phone module between realize the communication information share and mutual;
The IMS phone module carries out information interaction by described network communication unit and IMS territory network.
In the described terminal, described network communication unit further comprises detection module, mixed-media network modules mixed-media and hardware module, link to each other with configuration management element respectively, wherein,
Detection module, be used to receive the state information that handover module is sent, adjust and detect strategy, regularly obtain the network signal situation to mixed-media network modules mixed-media by the operating system calling interface, and determine switching time according to the switchover policy of this network signal situation and setting, the notice handover module;
Mixed-media network modules mixed-media is handled signaling and speech data according to CS territory and IMS field network communication agreement; By the hardware module collection network information that is attached thereto, regularly obtain for detection module; Receive the hand off signaling of CS phone module or IMS phone module, and described hand off signaling is sent to network side by hardware module; The control command that receives handover module is operated network interface.
Described CS territory network is global system for mobile communications GSM network, general packet radio service (GPRS) network, Wideband Code Division Multiple Access (WCDMA) inserts the WCDMA network or code division multiple access inserts the CDMA2000 network.Described IMS territory network is Wireless Fidelity WiFi network, blueteeth network, World Interoperability for Microwave Access, WiMax WiMAX network or Ethernet fixed access network network.
The present invention also provides a kind of method that communication is switched that realizes between different communication network, be applicable to the switching between CS territory network and the IMS territory network, and this method may further comprise the steps:
The signal(l)ing condition of A, detection CS territory network and IMS territory network;
B, according to the testing result that steps A obtained and the switchover policy of setting, determine whether to satisfy switchover policy, when satisfying switchover policy, communicate network and switch.
Network condition is good if testing result described in the step B is the IMS territory, and the then described network that communicates switches to the switching of carrying out to IMS territory network, specifically may further comprise the steps:
B11, end side initiate and finish the flow process of IMS territory registration to network side, and network side returns the special service call number to end side;
B12, initiate and finish the flow process of registration CS territory forward-shifting service.
Special service call number described in the step B11 comprises special clothes transferred number ForwardNo, special clothes cancellation call number DeregisterNo and special clothes switch call number HOServiceNo; Step B12 is: adopt special clothes transferred number ForwardNo described in the step B11 to initiate and finish the flow process of registration CS territory forward-shifting service.
Initiate described in the step B12 also to finish, for: end side is initiated and finished or network side is initiated and finished to network side.
Before described step B11, can further comprise and detect the step whether user is in session status, if the user is in session status, then after step B11, further may further comprise the steps:
B111, end side are initiated special clothes Handover Number to the IMS territory of network side and are called out;
The session of IMS territory is set up by end side in the IMS territory of B112, network side.
After described step B112 or before, the CS territory that can further comprise network side is by the step of end side deletion CS territory session.
Network signal weakens gradually if testing result described in the step B is the IMS territory, and the then described network that communicates switches to the switching of carrying out to CS territory network, specifically may further comprise the steps:
The flow process that nullify in the IMS territory is initiated and finished to B21, end side to network side;
B22, initiate and finish the flow process of cancellation CS territory forward-shifting service.
Initiate described in the step B22 also to finish, for: end side is initiated and finished or network side is initiated and finished to network side.
Before described step B21, further comprise and detect the step whether user is in session status, if the user is in session status, then after detecting step, before the step B21, further may further comprise the steps:
B201, end side are initiated special clothes Handover Number to the CS territory of network side and are called out;
The session switching is prepared in B202, network side CS field notice IMS territory;
The session of CS territory is set up by end side in the CS territory of B203, network side.
After described step B203 or before, the IMS territory that further comprises network side is by the step of end side deletion IMS territory session.
Network signal suddenly disappears if testing result described in the step B is the IMS territory, and the then described network that communicates switches to the switching of carrying out to CS territory network, specifically may further comprise the steps:
B31, end side are initiated and are gone to the IMS territory to network side and carry out the cancellation of IMS territory;
B32, initiate and finish the flow process of cancellation CS territory forward-shifting service.
Step B31 can be: end side is initiated special clothes to network side CS territory and is nullified number call, and CS field notice IMS carries out in the territory IMS territory and nullifies;
Or be: end side sends to network side CS territory and comprises the cancellation short message that special clothes are nullified number, and CS field notice IMS carries out in the territory IMS territory and nullifies;
Whether or be: it is effective to detect the GPRS connection, connects effectively if detect GPRS, and then end side sends to network side CS territory by the GPRS service and comprises the cancellation signaling message that spy's clothes are nullified number, and CS field notice IMS carries out in the territory IMS territory and nullifies.
Initiate described in the step B32 and finish to: end side and initiate and finish or network side is initiated and finished to network side.
Before described step B31, further comprise and detect the step whether user is in session status, if the user is in session status, then after detecting step, before the step B31, further may further comprise the steps:
B301, end side are initiated special clothes Handover Number to the CS territory of network side and are called out;
The session switching is prepared in B302, network side CS field notice IMS territory;
The CS session is set up by end side in the CS territory of B303, network side.
After described step B303 or before, the IMS territory that further comprises network side is by the step of end side deletion IMS territory session.
Described CS territory network is: GSM network, GPRS network, WCDMA network or CDMA2000 network.Described IMS territory network is: WiFi network, blueteeth network, WiMAX network or Ethernet fixed access network network.
The invention provides the terminal and the method that between different communication network, realize seamless switching, detect in real time by communication network signal IMS territory and circuit switching (CS) territory, and when satisfying switchover policy, between different communication network, realize seamless switching, guaranteed the continuity of session between transfer period.This terminal and method based on the IMS technology can be supported in towards the SIP session of multiple access technology from operation layer and realize mobility, realize from the seamless switching between IMS territory and the CS territory.For providing technical support as the IMS network of session control protocol, for further developing of FMC provides the otherwise effective technique assurance towards multiple access technology, employing SIP.
Description of drawings
Fig. 1 is a multimode terminal structural representation provided by the invention;
The embodiment signal flow schematic diagram of Fig. 2 for registering according to changing method provided by the invention;
The first embodiment signal flow schematic diagram of Fig. 3 for nullifying according to changing method provided by the invention;
The second embodiment signal flow schematic diagram of Fig. 4 for nullifying according to changing method provided by the invention;
Fig. 5 is the embodiment signal flow schematic diagram that is switched to the WiFi network by the GSM network according to during the changing method realization session provided by the invention;
Fig. 6 is the first embodiment signal flow schematic diagram that is switched to the GSM network by the WiFi network according to during the changing method realization session provided by the invention;
Fig. 7 is the second embodiment signal flow schematic diagram that is switched to the GSM network by the WiFi network according to during the changing method realization session provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is a multimode terminal structural representation provided by the invention.As shown in Figure 1, this terminal comprises configuration management element 100, conversation and switch unit 110 and network communication unit 120.Wherein, configuration management element 100 is used to preserve each module configuration information, and links to each other with other all modules and to carry out information interaction; Network communication unit 120 is determined switching time according to detected communication network information and switchover policy, and will switch message informing conversation and switch unit 110; Conversation and switch unit 110 send hand off signaling and send by network communication unit 120 after receiving the switching message of network communication unit 120.
Comprise CS phone module 111, IMS phone module 112 and handover module 113 in conversation and the switch unit 110, each module links to each other with configuration management element respectively; Comprise detection module 121, mixed-media network modules mixed-media 122 and hardware module 123 in the network communication unit 130, each module links to each other with configuration management element respectively.
Mixed-media network modules mixed-media 122 links to each other respectively with other all modules in the terminal and carries out information interaction, and supplies with detection module 121 and regularly obtain network related information, as information such as network identity, operator's informaiton, signal strength signal intensities.
As shown in Figure 1, in the terminal scheme provided by the invention, CS phone module 111 and IMS phone module 112 are two relatively independent parts, by public handover module 113 and detection module 121 both are combined.Handoff procedure is initiated by end side, provided support by network side, the continuity of switching is guaranteed by the handover module 113 and the network side of end side, switches by existing business (as forward-shifting service), realize simply, relative less to the change of terminal and network.
Terminal is finally carried out information interaction by hardware module 123 and outside.Mixed-media network modules mixed-media 122 will regularly send to detection module 121 from the information such as external network signal of hardware module 123.If detection module 121 is found network condition and need be switched, then with the message informing handover module 113 that switches, handover module 113 will be ordered accordingly according to actual conditions and will be dealt into CS phone module 111 and IMS phone module 112, to switch relevant signaling then and send to coupled mixed-media network modules mixed-media 122, and forward by hardware module 123, realize information interaction with network side.In needs, handover module 113 also can send to order mixed-media network modules mixed-media 122, controls it and some interface is carried out the operation of closing or entering resting state.
The invention provides the method that realizes seamless switching between different communication network, mainly is the seamless switching between CS territory network and the IMS territory network.The present invention detects the signal(l)ing condition of described CS territory network and IMS territory network, according to the testing result that obtains and the switchover policy of setting, determines whether to satisfy switchover policy then, communicates network and switch when satisfying switchover policy.
Described CS territory network is GSM network, GPRS network, WCDMA network or CDMA2000 network; Described IMS territory network is WiFi network, blueteeth network, WiMAX network or Ethernet fixed access network network, as IP-based voice (VoIP) telephone network.
In the method provided by the invention, mainly comprise register flow path, logout flow path and switching flow several sections.Described register flow path and logout flow path are all for the IMS territory.Wherein, when the user from CS territory network when IMS territory network switches, need carry out register flow path, comprise IMS territory registration and the professional two parts content of registration CS territory Call Forwarding Unconditional; When the user from IMS territory network when CS territory network switches, need carry out logout flow path, comprise that nullify in the IMS territory and the professional two parts content of cancellation CS territory Call Forwarding Unconditional.
Be that GSM network, IMS territory network are that the WiFi network is an example with CS territory network below, the switching flow between CS territory network and the IMS territory network is described, that is: switching related procedure with the communication between GSM network and the WiFi network is that example is analyzed and illustrated.
The embodiment signal flow schematic diagram of Fig. 2 for registering according to changing method provided by the invention.Present embodiment is an example explanation register flow path to switch to the WiFi network from the GSM network, and IMS phone module wherein is IMS sip user agent (UA), and the CS phone module is a gsm module.As shown in Figure 2, when GSM user enters the WiFi network, need carry out changeing registration before registration of IMS territory and the CS territory, switch to the WiFi network.By first kind of logon mode shown in the step 201-208A among Fig. 2, concrete steps are as follows:
Step 201, detection module regularly detects the WiFi signal of current all AP at bottom, selects one to satisfy and switch to the only AP of WiFi condition and be connected on this AP according to switchover policy, notifies handover module then;
Step 202, handover module is initiated IMS territory register flow path to IMS SIP UA;
Step 203A carries out the registration of IMS territory by IMS SIP UA to the IMS territory;
Step 204A after IMS succeeds in registration in the territory, returns to one group of special service number of terminal by the IMS territory, comprising: Call Forwarding Unconditional number (ForwardNo), cancellation number (DeregisterNo) and Handover Number (HOServiceNo);
Step 205A is initiated the flow process of registration forward-shifting service to gsm module by handover module;
Step 206A, to CS territory inquiry forward-shifting service, if the unregistered Call Forwarding Unconditional number of this user is then registered Call Forwarding Unconditional business and Call Forwarding Unconditional number ForwardNo, otherwise, finish;
Step 207A, the message of finishing the registration forward-shifting service is returned in the CS territory to gsm module.
Step 208A, the message of finishing registration is returned to IMS SIP UA in the IMS territory.
In above-mentioned first kind of logon mode, step 205A-207A represents to be initiated and finished by end side the flow process of registration CS territory forward-shifting service; And this flow process also can be initiated to finish by network side IMS territory, shown in step 204B-205B among Fig. 2.Therefore, correspondingly, present embodiment also provides second kind of logon mode, after step 201-202 as shown in Figure 2, execution in step 203B, 204B, 205B and 206B initiate and finish the flow process of registration CS territory forward-shifting service by network side IMS territory, and finish registration.Wherein, step 203B, 204B, 205B and 206B are specific as follows:
Step 203B carries out the registration of IMS territory by IMS SIP UA to the IMS territory;
Step 204B is initiated the flow process of registration forward-shifting service to the CS territory by the IMS territory at network side;
Step 205B, the message of finishing the registration forward-shifting service is returned in the CS territory to the IMS territory;
Step 206B after succeeding in registration, returns to one group of special service number of terminal IMS SIP UA by the IMS territory, comprising: Call Forwarding Unconditional number (ForwardNo), cancellation number (DeregisterNo) and Handover Number (HOServiceNo); And return the message of finishing registration.
Be example explanation logout flow path to switch to the GSM network from the WiFi network below.When GSM user roams out the WiFi network, the WiFi signal will occur and weaken gradually and the WiFi signal two kinds of situations that suddenly disappear.
The first embodiment signal flow schematic diagram of Fig. 3 for nullifying according to changing method provided by the invention, the situation that illustrates the WiFi signal to switch to the GSM network when decaying gradually and nullify, IMS phone module wherein is IMS SIP UA, and the CS phone module is a gsm module.By first kind of cancellation mode shown in the step 301-306A among Fig. 3, concrete steps are as follows:
Step 301, detection module detect the WiFi signal and decay gradually, the notice handover module;
Step 302, handover module is initiated IMS territory logout flow path to IMS SIP UA;
Step 303 is carried out the IMS territory by IMS SIP UA to the IMS territory and is nullified;
Step 304A is initiated the flow process of cancellation forward-shifting service to gsm module by handover module;
Step 305A, gsm module is to CS territory inquiry forward-shifting service, if the registered Call Forwarding Unconditional number of this user is then cancelled the Call Forwarding Unconditional business and deleted the Call Forwarding Unconditional number;
Step 306A, the message of finishing the cancellation forward-shifting service and the message of finishing cancellation are returned to gsm module in the CS territory.
In above-mentioned first kind of cancellation mode, step 304A-306A represents to be initiated and finished by end side the flow process of cancellation CS territory forward-shifting service; And this flow process also can be initiated to finish by network side IMS territory, shown in step 304B-305B among Fig. 3.Therefore, correspondingly, present embodiment also provides second kind of cancellation mode, and after step 301-303 as shown in Figure 3, execution in step 304B, 305B and 306B initiate and finish the flow process of cancellation CS territory forward-shifting service by network side IMS territory, and finish cancellation.Wherein, step 304B, 305B and 306B are specific as follows:
Step 304B is initiated the flow process of cancellation forward-shifting service to the CS territory by the IMS territory at network side;
Step 305B, the message of finishing the cancellation forward-shifting service is returned in the CS territory to the IMS territory.
Step 306B, the message of finishing cancellation is returned in the CS territory to gsm module.
For above-mentioned situation of when the WiFi signal weakens gradually, nullifying, because this moment, terminal and WiFi network did not also disconnect, thereby above-mentioned two kinds of cancellation modes all are that terminal is passed through the WiFi network and initiatively initiated IMS territory logout flow path, and behind the forward-shifting service of cancellation CS territory, switch to the GSM network, these two kinds differences of nullifying mode are: first kind of cancellation mode is by the end side initiation and finishes the cancellation forward-shifting service, and second kind of cancellation mode is to initiate and finish the cancellation forward-shifting service by network side.
For the situation of nullifying when the WiFi signal suddenly disappears, owing to terminal and WiFi network are out of touch at this moment, so terminal can not directly realize the cancellation of IMS territory by the IMS territory.Though not under the WiFi network coverage, this User Status that network is preserved still is a login state to terminal in fact.If have this user of other IMS customer call this moment, network side can't route the call to terminal.In this case, can't directly nullify by above-mentioned method as shown in Figure 3, at this moment, terminal can take special cancellation method that the cancellation of special IMS territory is finished in message switching to the IMS territory, nullifies mode comprising following several special IMS territory:
Mode A: terminal is initiated special service number (DeregisterNo) and is called out from the CS territory, after this calling is routed to the IMS network, User Status is changed to unregistered by the IMS territory.
Mode B: terminal sends SMS message by short message (SMS) service, and by a particular gateway interface information needed is forwarded to the IMS territory, User Status is changed to unregistered by the IMS territory.
Mode C: terminal changes to User Status unregistered by IMS by GPRS (GPRS) Service Notification IMS territory then.
Like this, can be after finishing the cancellation of special IMS territory by the way, cancellation CS territory forward-shifting service switches to the GSM network.At this moment, when other user makes a call in the IMS network, just will change and handle, and be properly routed to the CS territory and find terminal by the unregistered services device.
For above-mentioned situation when the WiFi signal suddenly disappears, can adopt above-mentioned special IMS territory to nullify mode A, promptly go to the mode that the cancellation of special IMS territory is finished in the IMS territory, thereby finish special cancellation by initiate special service number (DeregisterNo) calling from the CS territory.Handling process as shown in Figure 4.
The second embodiment signal flow schematic diagram of Fig. 4 for nullifying according to changing method provided by the invention, the situation that illustrates the WiFi signal to switch to the GSM network when suddenly disappearing and carry out special cancellation, IMS phone module wherein is IMS SIP UA, and the CS phone module is a gsm module.Wherein, specific as follows by the special cancellation mode of first kind shown in the step 401-407A among Fig. 4:
Step 401, detection module detect the WiFi signal suddenly disappear unavailable, the notice handover module;
Step 401, handover module is initiated CS territory logout flow path to gsm module;
Step 403, gsm module sends special service number (DeregisterNo) to the CS territory and calls out;
Step 404, CS field notice IMS territory, the IMS territory changes to unregistered state with User Status;
Step 405A is initiated the flow process of cancellation forward-shifting service to gsm module by handover module;
Step 406A, gsm module is to CS territory inquiry forward-shifting service, if the registered Call Forwarding Unconditional number of this user is then cancelled the Call Forwarding Unconditional business and deleted the Call Forwarding Unconditional number;
Step 407A, the message of finishing the cancellation forward-shifting service and the message of finishing special cancellation are returned to gsm module in the CS territory.
In above-mentioned first kind of special cancellation mode, step 402-404 adopts aforementioned special IMS territory to nullify mode A to finish the cancellation of special IMS territory, and wherein, described special service number (DeregisterNo) has sent to terminal by network side when carrying out the registration of IMS territory; Step 405A-407A represents to be initiated and finished by end side the flow process of cancellation CS territory forward-shifting service; And this flow process also can be initiated to finish by network side, shown in step 405B among Fig. 4.Therefore, correspondingly, present embodiment also provides second kind of special cancellation mode, and after step 401-404 as shown in Figure 4, execution in step 405B and 406B initiate and finish the flow process of cancellation CS territory forward-shifting service by network side CS territory, and finish cancellation.Wherein, step 405B and 406B are specific as follows:
Step 405B is initiated and is finished the flow process of cancelling forward-shifting service at network side by the CS territory;
Step 406B, the message of finishing special cancellation is returned in the CS territory to gsm module.
For the above-mentioned adoptable mode B of special cancellation that when the WiFi signal suddenly disappears, carries out, be that terminal goes to the mode that nullify in the IMS territory by the SMS service, implementation step and the above-mentioned step that mode A adopted are similar, unique difference is: in flow process as shown in Figure 4, step 403 becomes: send the cancellation short message that comprises DeregisterNo to network side CS territory, then after this CS territory can go to the IMS territory and finish special logout flow path.
For the above-mentioned adoptable mode C of special cancellation that when the WiFi signal suddenly disappears, carries out, it is the mode that terminal is nullified by GPRS Service Notification IMS territory, implementation step and the above-mentioned step that mode A adopted are similar, unique difference is: in flow process as shown in Figure 4, if it is available that GPRS connects, then step 403 becomes: send the cancellation signaling message that comprises DeregisterNo by GPRS to network side CS territory, after this CS territory can go to the IMS territory and finish special logout flow path.
Below in the analysis of switching between the different communication network, with the example that switches between GSM network and the WiFi network.No matter be to switch to WiFi, still switch to GSM that handoff procedure all is divided into two kinds of situations, promptly switch during idle period of time switching and the session by WiFi by GSM.
In the switching of idle period of time, its implementation procedure is fairly simple.For idle period of time by the switching of GSM to WiFi, then its implementation procedure is exactly aforementioned registration process as shown in Figure 2: no matter adopt which kind of logon mode, the IMS territory succeed in registration and finish the registration forward-shifting service after, promptly finished switching.For idle period of time by the switching of WiFi to GSM, then its implementation procedure is exactly aforementioned as Fig. 3 or log off procedure shown in Figure 4: if the WiFi signal weakens gradually, then adopt cancellation method as shown in Figure 3 to carry out cancellation of IMS territory and cancellation forward-shifting service, promptly finished switching; If the WiFi signal suddenly disappears, then adopt special cancellation method, carry out cancellation of special IMS territory and cancellation forward-shifting service, promptly finished switching, wherein, nullify in described special IMS territory, promptly go to the IMS territory and change User Status into unregistered state, this process can be by carrying out special service number (DeregisterNo) to the CS territory and call out as shown in Figure 4, and promptly aforesaid mode A realizes, also can be by the mode of SMS message or GPRS message, promptly foregoing mode B or mode C realize.
Switching during session, owing to need to guarantee the continuity of user conversation, thereby its implementation procedure more complicated, need to realize by the mode that special clothes Handover Numbers (HOServiceNo) are called out.
Fig. 5 is the embodiment signal flow schematic diagram that is switched to the WiFi network by the GSM network according to during the changing method realization session provided by the invention, and IMS phone module wherein is IMS SIP UA, and the CS phone module is a gsm module.As shown in Figure 5, detection module regularly detects current WiFi network condition, and when detecting the AP that satisfies condition, detection module is connected to this AP and sends and is notified to handover module, and handover module is initiated by the switching of GSM to WiFi.Concrete steps are as follows:
Step 501, during session, detection module detects signal and satisfies the condition that switches to WiFi, and notifies handover module with testing result;
Step 502, handover module is initiated IMS territory register flow path to IMS SIP UA;
Step 503 is carried out the registration of IMS territory by IMS SIP UA to the IMS territory;
Step 504 after IMS succeeds in registration in the territory, returns to one group of special service number of IMS SIP UA by the IMS territory;
Step 505, handover module is initiated the special clothes switch call of IMS territory to IMS SIP UA;
Step 506, IMS SIP UA carries out the switch call (HOServiceNo) of spy's clothes to the IMS territory;
Step 507, the WiFi session is set up to IMS SIP UA request in the IMS territory;
Step 508, IMS SIP UA returns to the IMS territory and finishes the message of setting up the WiFi session;
Step 509, the CS territory is to gsm module request deletion GSM session;
Step 510, gsm module are returned the message of finishing deletion GSM session to the CS territory;
Step 511A initiates to replenish register flow path by handover module, initiates the flow process of registration forward-shifting service to gsm module;
Step 512A, gsm module is to CS territory inquiry forward-shifting service, if the unregistered Call Forwarding Unconditional number of this user is then registered Call Forwarding Unconditional business and Call Forwarding Unconditional number ForwardNo; Otherwise, finish;
Step 513A, the message of finishing the registration forward-shifting service is returned in the CS territory to gsm module;
Step 514A, the IMS territory is returned to IMS SIP UA and is finished the message of replenishing registration.Finish and switch to WiFi.
During the session as shown in Figure 5 in the embodiment that the WiFi network switches, step 502-504 carries out the registration of IMS territory, after the spy shown in step 505-506 obeys Handover Number (HOServiceNo) calling, step 507-510 takes soft handoff to delete the GSM session after setting up the WiFi session, in fact, take hard handover approach, promptly the WiFi session is set up in deletion GSM session more earlier, also is feasible.After finishing to step 510, session service has been transferred to the WiFi network.
Shown in step 511A-514A among Fig. 5 is first kind of additional logon mode in the present embodiment, initiate and finish the flow process of registration CS territory forward-shifting service by end side, finish additional register flow path then, its process is the same with aforementioned process shown in step 205A-208A in first kind of logon mode among Fig. 2.
In the additional register flow path of present embodiment, also can initiate and finish registration CS territory forward-shifting service by network side IMS territory, finish additional register flow path then, shown in the 511B-513B among Fig. 5, its process is the same with aforementioned process shown in step 204B-206B in second kind of logon mode among Fig. 2.Second kind of additional logon mode that present embodiment provides, concrete steps are as follows:
Step 511B, the flow process of registration forward-shifting service is initiated in network side IMS territory to the CS territory;
Step 512B, the message of finishing the registration forward-shifting service is returned in the CS territory to the IMS territory;
Step 513B, the IMS territory is returned to IMS SIP UA and is finished the message of replenishing registration.Finish and switch to WiFi.
During the session as shown in Figure 5 in the present embodiment that the WiFi network switches, handover module calls IMS SIP UA finish the registration of IMS territory after, initiate special clothes Handover Numbers (HOServiceNo) by the IMS territory and call out, switch to the IMS network.Network side inquires former session channel according to call information, and distributes new session channel, behind the switching destination that continued, discharges the handover source end.Behind the session handover success, can carry out the additional register flow path shown in step 511A-514A or step 511B-513B at once, carry out described additional register flow path again after also can waiting for this end of conversation.
Fig. 6 is the first embodiment signal flow schematic diagram that is switched to the GSM network by the WiFi network according to during the changing method realization session provided by the invention, and IMS phone module wherein is IMS SIP UA, and the CS phone module is a gsm module.As shown in Figure 6, detection module regularly detects current WiFi network condition, when detecting the WiFi poor signal and weaken gradually, and detection module notice handover module, handover module is initiated by the switching of WiFi to GSM.Concrete steps are as follows:
Step 601, during session, detection module detects the WiFi signal to be weakened gradually, then notifies handover module with testing result;
Step 602, handover module is initiated the special clothes switch call of CS territory to gsm module;
Step 603, gsm module carries out the switch call (HOServiceNo) of spy's clothes to the CS territory;
Step 604, CS field notice IMS territory prepare to carry out the session switching;
Step 605, the GSM session is set up to the gsm module request in the CS territory;
Step 606, gsm module are returned to the CS territory and are finished the message of setting up the GSM session;
Step 607, the IMS territory is to IMS SIP UA request deletion WiFi session;
Step 608, IMS SIP UA returns the message of finishing deletion WiFi session to the IMS territory;
Step 609A, handover module initiates to replenish logout flow path to IMS SIP UA;
Step 610A, IMS SIP UA carry out the IMS territory to the IMS territory and nullify;
Step 611A, handover module is initiated cancellation forward-shifting service flow process to gsm module;
Step 612A, gsm module is to CS territory inquiry forward-shifting service, if the registered Call Forwarding Unconditional number of this user is then cancelled the Call Forwarding Unconditional business and deleted the Call Forwarding Unconditional number;
Step 613A, the CS territory is returned the message of finishing the cancellation forward-shifting service and is finished the message of replenishing cancellation to gsm module.Finish and switch to GSM.
During the session as shown in Figure 6 because the WiFi signal weakens gradually in the present embodiment that the GSM network switches, step 602-604 obeys Handover Number (HOServiceNo) by the spy to call out the GSM network, network side CS receives in the territory that calling back and switch application server (HO_AS) communicate, the Handover Number that carries according to calling identifies the operation that the terminal that will switch and needs carry out, and goes to the IMS territory and finish special cancellation; Step 605-608 takes soft handoff to delete the WiFi session after setting up the GSM session, in fact, takes hard handover approach, and promptly the GSM session is set up in deletion WiFi session more earlier, also is feasible.After finishing to step 608, session service has been transferred to the GSM network.
Shown in step 609-613A among Fig. 6 is first kind of additional cancellation mode in the present embodiment, its process is the same with aforementioned process shown in step 302-306A in first kind of cancellation mode among Fig. 3, promptly carrying out the IMS territory earlier nullifies, shown in step 609-610, initiate and finish the flow process of cancellation CS territory forward-shifting service then by end side, shown in step 611A-613A.
In the additional logout flow path of present embodiment, also can initiate and finish cancellation CS territory forward-shifting service by network side IMS territory.Therefore, correspondingly, present embodiment also provides second kind of additional cancellation mode, shown in step 609-613B, its process with aforementioned as among Fig. 3 second kind to nullify the process shown in the mode kind step 302-306B be the same, promptly carry out the cancellation of IMS territory earlier, shown in step 609-610, initiate and finish the flow process of cancellation CS territory forward-shifting service then by network side IMS territory, shown in step 611B-612B, nullify thereby finish to replenish.Wherein step 611B, 612B and 613B are specific as follows:
Step 611B, the flow process of cancellation forward-shifting service is initiated in network side IMS territory to the CS territory;
Step 612B, the message of finishing the cancellation forward-shifting service is returned in the CS territory to the IMS territory;
Step 613B, the CS territory is returned to finish to gsm module and is replenished the message of nullifying.Finish and switch to GSM.
During the session as shown in Figure 6 because the WiFi signal weakens gradually in the present embodiment that the GSM network switches, handover module calls gsm module and initiates special clothes Handover Numbers (HOServiceNo) calling in the CS territory, and this number sends to terminal by network side by signaling when registration.Owing to switch from initiating a new calling to network by terminal, network side need will this new calling and former session association get up, substitute calling in the past with this new calling, therefore, network side inquires former session channel according to call information, and distribute new session channel, behind the switching destination that continued, discharge the handover source end.Behind the session handover success, can carry out the additional logout flow path shown in step 609-613A or step 609-613B at once, carry out described additional logout flow path again after also can waiting for this end of conversation.
Fig. 7 is the second embodiment signal flow schematic diagram that is switched to the GSM network by the WiFi network according to during the changing method realization session provided by the invention, and IMS phone module wherein is IMS SIP UA, and the CS phone module is a gsm module.As shown in Figure 7, detection module regularly detects current WiFi network condition, when detecting the WiFi signal and suddenly disappear, and detection module notice handover module, handover module is initiated by the switching of WiFi to GSM.Concrete steps are as follows:
Step 701, during session, detection module detects the WiFi signal and suddenly disappears, and then notifies handover module with testing result;
Step 702, handover module is initiated the special clothes switch call of CS territory to gsm module;
Step 703, gsm module carries out the switch call (HOServiceNo) of spy's clothes to the CS territory;
Step 704, CS field notice IMS territory prepare to carry out the session switching;
Step 705, the GSM session is set up to the gsm module request in the CS territory;
Step 706, gsm module are returned to the CS territory and are finished the message of setting up the GSM session;
Step 707, the IMS territory is to IMS SIP UA request deletion WiFi session;
Step 708, IMS SIP UA returns the message of finishing deletion WiFi session to the IMS territory;
Step 709, handover module initiates to replenish special logout flow path to gsm module;
Step 710, gsm module sends special service number (DeregisterNo) to the CS territory and calls out;
Step 711, CS field notice IMS territory, the IMS territory changes to unregistered state with User Status;
Step 712A, handover module initiate the flow process of cancellation forward-shifting service to gsm module;
Step 713A, gsm module is to CS territory inquiry forward-shifting service, if the registered Call Forwarding Unconditional number of this user is then cancelled the Call Forwarding Unconditional business and deleted the Call Forwarding Unconditional number;
Step 714A, the CS territory is returned the message of finishing the cancellation forward-shifting service and is finished the message of replenishing special cancellation to gsm module.Finish and switch to GSM.
During the session as shown in Figure 7 because the WiFi signal suddenly disappears in the present embodiment that the GSM network switches, step 702-704 obeys Handover Number (HOServiceNo) by the spy to call out the GSM network, network side CS receives in the territory that calling back and switch application server (HO_AS) communicate, the Handover Number that carries according to calling identifies the operation that the terminal that will switch and needs carry out, and notice IMS territory is prepared to carry out session and switched; Step 705-708 takes soft handoff to delete the WiFi session after setting up the GSM session, in fact, takes hard handover approach, and promptly the GSM session is set up in deletion WiFi session more earlier, also is feasible.After finishing to step 708, session service has been transferred to the GSM network.
In present embodiment as shown in Figure 7, because the WiFi signal suddenly disappears, can't carry out the IMS territory by the IMS territory nullifies, therefore the IMS territory log off procedure in the additional logout flow path that carries out after step 708 is different with common IMS territory cancellation mode shown in step 609-610 among Fig. 6.IMS territory log off procedure in the additional logout flow path described in the present embodiment, can only adopt foregoing special IMS territory to nullify mode, go to the IMS territory and finish the cancellation of IMS territory, thereby the described additional cancellation of carrying out after step 708 is called as additional special cancellation.
In the present embodiment, the described special IMS territory log off procedure that replenishes in the special logout flow path, adopted foregoing special IMS territory to nullify mode A, promptly go to the IMS territory by initiate special service number (DeregisterNo) calling from the CS territory, by the IMS territory User Status is become unregistered state, nullify thereby finish special IMS territory, concrete steps are shown in step 402-404 among Fig. 4.The described in the present embodiment additional special logout flow path that carries out after step 708 both can adopt first kind of special cancellation mode shown in step 402-407A among Fig. 4, also can adopt second kind of special cancellation mode shown in step 402-406B among Fig. 4.
Shown in step 709-714A among Fig. 7 is first kind of additional special logout flow path in the present embodiment, wherein adopted aforementioned first kind of special cancellation mode shown in step 402-407A among Fig. 4 to finish special cancellation, promptly finish the cancellation of special IMS territory by going to the IMS territory earlier from CS territory initiation special service number (DeregisterNo) calling, shown in step 709-711, initiate and finish the flow process of cancellation CS territory forward-shifting service then by end side, shown in step 712A-714A, replenish special logout flow path thereby finish.
Shown in step 709-713B among Fig. 7 is second kind of additional special logout flow path in the present embodiment, wherein adopted aforementioned second kind of special cancellation mode shown in step 402-406B among Fig. 4 to finish special cancellation, promptly finish the cancellation of special IMS territory by going to the IMS territory earlier from CS territory initiation special service number (DeregisterNo) calling, shown in step 709-711, initiate and finish the flow process of cancellation CS territory forward-shifting service then by network side, shown in step 712B, replenish special logout flow path thereby finish.Wherein step 712B and 713B are specific as follows:
Step 712B is initiated and is finished the flow process of cancelling forward-shifting service at network side by the CS territory;
Step 713B, the CS territory is returned to gsm module and is finished the message of replenishing special cancellation.Finish and switch to GSM.
During the session as shown in Figure 7 because the WiFi signal suddenly disappears in the present embodiment that the GSM network switches, handover module calls gsm module and initiates special clothes Handover Numbers (HOServiceNo) calling in the CS territory, and this number sends to terminal by signaling by network side when registering.Owing to switch from initiating a new calling to network by terminal, network side need will this new calling and former session association get up, substitute calling in the past with this new calling, therefore, network side inquires former session channel according to call information, and distribute new session channel, behind the switching destination that continued, discharge the handover source end.Behind the session handover success, can carry out the additional special logout flow path shown in step 709-714A or step 709-713B at once, also can wait for and carry out the described special logout flow path that replenishes behind this end of conversation again.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (22)
1, a kind of communication terminal of switching between the different communication network realized is characterized in that, comprises configuration management element, network communication unit and conversation and switch unit, wherein,
Configuration management element is used to preserve the configuration information of each unit, and carries out information interaction with each unit;
Converse and switch unit, the Man Machine Interface of CS and IMS phone is provided, finish the call function of CS and IMS phone, be used to receive the switching notice of network communication unit, and send hand off signaling to network side by network communication unit;
Network communication unit is handled signaling and speech data according to CS territory and IMS field network communication agreement, is used for determining switching time according to the switchover policy of detected communication network information and setting, and notice conversation and switch unit; The hand off signaling of conversing and switch unit sends is sent to network side.
2, terminal as claimed in claim 1 is characterized in that, comprises handover module, circuit switching (CS) phone module and IP Multimedia System IMS phone module in described conversation and the switch unit, link to each other with configuration management element respectively, wherein,
Handover module is used for oneself state informing network communication unit with the control detection strategy, and after the switching notice of receiving from network communication unit, control CS phone module and IMS phone module communicate and handover operation; CS phone module and IMS phone module send by network communication unit hand off signaling to network side;
The CS phone module carries out information interaction by described network communication unit and CS territory network; And and the IMS phone module between realize the communication information share and mutual;
The IMS phone module carries out information interaction by described network communication unit and IMS territory network.
3, terminal as claimed in claim 2 is characterized in that: described network communication unit further comprises detection module, mixed-media network modules mixed-media and hardware module, link to each other with configuration management element respectively, wherein,
Detection module, be used to receive the state information that handover module is sent, adjust and detect strategy, regularly obtain the network signal situation to mixed-media network modules mixed-media by the operating system calling interface, and determine switching time according to the switchover policy of this network signal situation and setting, the notice handover module;
Mixed-media network modules mixed-media is handled signaling and speech data according to CS territory and IMS field network communication agreement; By the hardware module collection network information that is attached thereto, regularly obtain for detection module; Receive the hand off signaling of CS phone module or IMS phone module, and described hand off signaling is sent to network side by hardware module; The control command that receives handover module is operated network interface.
4, terminal as claimed in claim 2 is characterized in that: described CS territory network is global system for mobile communications GSM network, general packet radio service (GPRS) network, Wideband Code Division Multiple Access (WCDMA) inserts the WCDMA network or code division multiple access inserts the CDMA2000 network.
5, terminal as claimed in claim 2 is characterized in that: described IMS territory network is Wireless Fidelity WiFi network, blueteeth network, World Interoperability for Microwave Access, WiMax WiMAX network or Ethernet fixed access network network.
6, a kind of method that realizes the communication switching between different communication network is applicable to the switching between CS territory network and the IMS territory network, and it is characterized in that: this method may further comprise the steps:
The signal(l)ing condition of A, detection CS territory network and IMS territory network;
B, according to the testing result that steps A obtained and the switchover policy of setting, determine whether to satisfy switchover policy, when satisfying switchover policy, communicate network and switch.
7, method as claimed in claim 6 is characterized in that: testing result described in the step B is that IMS territory network condition is good, and the described network that communicates switches to the switching of carrying out to IMS territory network, specifically may further comprise the steps:
B11, end side initiate and finish the flow process of IMS territory registration to network side, and network side returns the special service call number to end side;
B12, initiate and finish the flow process of registration CS territory forward-shifting service.
8, method as claimed in claim 7 is characterized in that: the special service call number described in the step B11 comprises special clothes transferred number ForwardNo, special clothes cancellation call number DeregisterNo and special clothes switch call number HOServiceNo; Step B12 is: adopt special clothes transferred number ForwardNo described in the step B11 to initiate and finish the flow process of registration CS territory forward-shifting service.
9, method as claimed in claim 7 is characterized in that: initiate described in the step B12 also to finish, for: end side is initiated and finished or network side is initiated and finished to network side.
10, as claim 7 or 9 described methods, it is characterized in that: before described step B11, further comprise and detect the step whether user is in session status,, then after step B11, further may further comprise the steps if the user is in session status:
B111, end side are initiated special clothes Handover Number to the IMS territory of network side and are called out;
The session of IMS territory is set up by end side in the IMS territory of B112, network side.
11, method as claimed in claim 10 is characterized in that: after described step B112 or before, the CS territory that further comprises network side is by the step of end side deletion CS territory session.
12, method as claimed in claim 6 is characterized in that: testing result described in the step B is that IMS territory network signal weakens gradually, and the described network that communicates switches to the switching of carrying out to CS territory network, specifically may further comprise the steps:
The flow process that nullify in the IMS territory is initiated and finished to B21, end side to network side;
B22, initiate and finish the flow process of cancellation CS territory forward-shifting service.
13, method as claimed in claim 12 is characterized in that: initiate described in the step B22 also to finish, for: end side is initiated and finished or network side is initiated and finished to network side.
14, as claim 12 or 13 described methods, it is characterized in that: before described step B21, further comprise and detect the step whether user is in session status, if the user is in session status, then after detecting step, before the step B21, further may further comprise the steps:
B201, end side are initiated special clothes Handover Number to the CS territory of network side and are called out;
The session switching is prepared in B202, network side CS field notice IMS territory;
The session of CS territory is set up by end side in the CS territory of B203, network side.
15, method as claimed in claim 14 is characterized in that: after described step B203 or before, the IMS territory that further comprises network side is by the step of end side deletion IMS territory session.
16, method as claimed in claim 6 is characterized in that: testing result described in the step B is that IMS territory network signal suddenly disappears, and the described network that communicates switches to the switching of carrying out to CS territory network, specifically may further comprise the steps:
B31, end side are initiated and are gone to the IMS territory to network side and carry out the cancellation of IMS territory;
B32, initiate and finish the flow process of cancellation CS territory forward-shifting service.
17, method as claimed in claim 16 is characterized in that:
Step B31 is: end side is initiated special clothes to network side CS territory and is nullified number call, and CS field notice IMS carries out in the territory IMS territory and nullifies;
Or be: end side sends to network side CS territory and comprises the cancellation short message that special clothes are nullified number, and CS field notice IMS carries out in the territory IMS territory and nullifies;
Whether or be: it is effective to detect the GPRS connection, connects effectively if detect GPRS, and then end side sends to network side CS territory by the GPRS service and comprises the cancellation signaling message that spy's clothes are nullified number, and CS field notice IMS carries out in the territory IMS territory and nullifies.
18, as claim 16 or 17 described methods, it is characterized in that: initiate described in the step B32 and finish to: end side and initiate and finish or network side is initiated and finished to network side.
19, as claim 16 or 17 described methods, it is characterized in that: before described step B31, further comprise and detect the step whether user is in session status, if the user is in session status, then after detecting step, before the step B31, further may further comprise the steps:
B301, end side are initiated special clothes Handover Number to the CS territory of network side and are called out;
The session switching is prepared in B302, network side CS field notice IMS territory;
The CS session is set up by end side in the CS territory of B303, network side.
20, method as claimed in claim 19 is characterized in that: after described step B303 or before, the IMS territory that further comprises network side is by the step of end side deletion IMS territory session.
21, method as claimed in claim 6 is characterized in that: described CS territory network is: GSM network, GPRS network, WCDMA network or CDMA2000 network.
22, method as claimed in claim 6 is characterized in that: described IMS territory network is: WiFi network, blueteeth network, WiMAX network or Ethernet fixed access network network.
Priority Applications (2)
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| CNA2006100836606A CN101083833A (en) | 2006-06-02 | 2006-06-02 | Terminal and method for realizing seamless switching among different communication network |
| PCT/CN2007/070058 WO2007140722A1 (en) | 2006-06-02 | 2007-05-28 | A terminal and method for seamless switching among different communication networks |
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| CNA2006100836606A CN101083833A (en) | 2006-06-02 | 2006-06-02 | Terminal and method for realizing seamless switching among different communication network |
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| CN1297124C (en) * | 2004-09-30 | 2007-01-24 | 华为技术有限公司 | System and method for carrying service using circuit switching in IP multimedia subsystem |
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