CN101374356B - Method for switching VoIP in IMS domain, IMS system, terminal and VCC application server - Google Patents
Method for switching VoIP in IMS domain, IMS system, terminal and VCC application server Download PDFInfo
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- CN101374356B CN101374356B CN2008102244518A CN200810224451A CN101374356B CN 101374356 B CN101374356 B CN 101374356B CN 2008102244518 A CN2008102244518 A CN 2008102244518A CN 200810224451 A CN200810224451 A CN 200810224451A CN 101374356 B CN101374356 B CN 101374356B
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Abstract
The invention provides a switching method of VoIP in IMS domain, an IMS system, a terminal and a VCC application server. The method includes the following steps: step A, the terminal accesses, registers and loges on to IM core net through at least two different wireless IP access networks; step B, in the process for carrying a VoIP communication through at least one of two IP access networks, if the terminal meets the pre-set switching condition between the IP access network, a switching request in the IMS domain is initiated; step C, the speech calling continues application server receives the switching request, and switches the signaling between the terminal and the VCC application server to the other IP access network except the IP access network loading the VoIP communication at present in at least two IP access networks. Using the technical scheme can realize the VoIP seamless switching of the terminal in the IMS domain, thereby improving the experience of users.
Description
Technical field
The present invention relates to communication field, particularly relate to changing method, IMS system, terminal and the VCC application server of VoIP in a kind of IMS territory.
Background technology
3GPP R7 version has been issued audio call (VCC, Voice Call Continuous) function structure continuously, with the seamlessness of realizing that the across a network voice switch.Fig. 1 is the basic principle schematic of VCC.Among Fig. 1, terminal (UE, User Equipment) A is through WLAN (WLAN; Wireless LocalArea Network) is linked into IP Multimedia System (IMS like WiFi; IP MultimediaSubsystem), exemplarily, the access point through WiFi is linked into IMS; Through GSM or 3G mobile network access mobile core net, as being linked into mobile core network through relevant base station.< < when this communication link of-IMS was unimpeded, the user can dial or answer IP phone to-WiFi, and < < when this communication link of-CS territory was unimpeded, the user can dial or answer the CS phone to-GSM as UE A as UE A.Can find out that 3GPP VCC is actually the problem that solves voice two-way switching between two territories, comprises from the IMS territory switching to the CS territory, switches to the IMS territory from the CS territory.Development and application along with the WiMax technology; WiFi/>WiMax bimodulus or WiFi/WiMax/xG (x represents 2G, 2.5G, 3G) three mould mobile phones will obtain practical application; When this multimode terminal is linked into IMS through WiFi and WiMax so; The problem that certainly will bring VoIP in the IMS territory (networking telephone, Voice over Internet Protocol) voice continuity to switch.Fig. 2 has increased the VCC basic principle schematic of switching between the WLAN WLAN.And address this problem still do not have international norm at present can foundation.
Fig. 3 is the system principle sketch map of existing 3GPP VCC.From the technology angle aspect, be support terminal VCC function, 3GPP has increased a functional entity VCC application server (VCC Application) in the IMS architecture.All of UE are gone into to exhale and are gone out to exhale, and comprise that the signaling paths of going into to exhale and going out to exhale in CS territory and IMS territory all passes through VCC Application, carry out centralized control by VCC Application, can realize calling out the switching between CS territory and IMS territory.In the IMS territory, VCC Application is one provides VCC professional application server (AS, Application Server) for UE; In the CS territory; VCC Application utilizes the CAMEL in CS territory, and (mobile network strengthens the customized application logic; Customised Applications for Mobile network Enhanced Logic) all CS territories of function intercepting and capturing UE are gone into to exhale and are gone out to exhale, and then this call anchor (Anchor) are arrived the IMS territory.
Summary of the invention
The changing method, IMS system, terminal and the VCC application server that the purpose of this invention is to provide VoIP in a kind of IMS territory are to solve the technical problem that can't in the IMS territory, realize the VoIP seamless switching in the prior art.
To achieve these goals, the invention provides the changing method of VoIP in a kind of IMS territory, comprise the steps:
Steps A, the terminal inserts through at least two different wireless IP access networks and registration signs in to the IMS core net;
Step B carries out through one in said two IP Access Networks in the process of VoIP conversation at said terminal at least, if the switching condition between the preset IP Access Network is satisfied at said terminal, then initiates the handoff request in the IMS territory;
Step C; Audio call continuous application server receives said handoff request, and the signaling between said terminal and the said audio call continuous application server is switched on one of them the IP Access Network in said two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying at least.
Preferably, described changing method, wherein, in the said steps A, said terminal signs in to the IMS core net through at least two different IP Access Networks accesses and registration and is:
Said terminal obtains different IP addresses through said different wireless IP access network, and uses different privately owned sign PVI to sign in to said IMS core net with identical public identify PUI;
Said terminal obtains different IP addresses through said different wireless IP access network, and uses identical privately owned sign PVI to sign in to said IMS core net with different public identify PUI; Or,
Said terminal obtains different IP addresses through said different wireless IP access network, and uses identical privately owned sign PVI to sign in to said IMS core net with identical public identify PUI.
Preferably, described changing method, wherein, among the said step B, if switching condition between the preset IP Access Network is satisfied at said terminal, the step of then initiating the handoff request in the IMS territory comprises:
The signal energy value of the wireless access network of current carrying VoIP conversation is detected at said terminal;
The said detected signal energy value of said terminal judges whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
Preferably, described changing method, wherein, among the said step B, if switching condition between the preset IP Access Network is satisfied at said terminal, the step of then initiating the handoff request in the IMS territory comprises:
Judge that the signal whether said terminal receives the Target IP Access Network of desiring to switch in IP Access Network switching command and the said switching command of user input has reached the second preset network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
Preferably, described changing method, wherein, among the said step B, confirm said terminal satisfy preset IP Access Network switching condition after, initiate also to comprise before the said handoff request:
The IP Access Network desiring to switch to is confirmed at said terminal according to preset switching priority.
Preferably, described changing method, wherein, in the said steps A, said terminal also comprises after signing in to the IMS core net through at least two different IP Access Networks accesses and registration:
Said audio call continuous application server writes down the presence at said terminal as major key with said privately owned sign and public identify; Or,
Said audio call continuous application server is inquired about said terminal presence as major key from home subscriber server with said privately owned sign and public identify.
Preferably, described changing method wherein, when said terminal is the callee of VoIP conversation, after said steps A, before the said step B, also comprises:
Said audio call continuous application server through exhaling routing strategy the end of v3 interface setting, selects an Access Network to carry said VoIP conversation according in advance at least from said two IP Access Networks.
Preferably, described changing method wherein, among the said step C, before carrying out said switching, also comprises:
Said audio call continuous application server is determined the step of the target access network of desiring to switch to according to being arranged on the switchover policy from one's body through the v3 interface in advance.
Preferably, described changing method, wherein, said audio call continuous application server provides different voice to call out continuous domain in said at least two different IP Access Networks each to switch unified resource identifier VDI; Carry the VDI of the target access network of desiring to switch in the handoff request in the IMS territory of said initiation; Among the said step C, before carrying out said switching, said audio call continuous application server carries out said switching according to the VDI of the said target access network that carries in the said handoff request.
Preferably, described changing method, wherein,
Among the said step B, said terminal is invited through making a call and is initiated said handoff request, and the VDI of the said target access network of desiring to switch to carries through the request unified resource identifier in the said calling invitation;
Among the said step C; Said audio call continuous application server is from the calling invitation that initiate at said terminal; Take out described request unified resource identifier, and with the signaling between said terminal and the said audio call continuous application server switch to described request unified resource identifier in the corresponding target access network of said VDI that carries.
On the other hand, a kind of IMS is provided system, has comprised: the continuous server of terminal and audio call, it is characterized in that,
Said terminal comprises:
AM access module is used for signing in to the IMS core net through at least two different wireless IP access networks access and registrations;
Audio call continuous control module; Be used for carrying out in the process of VoIP conversation said terminal through said at least two IP Access Networks; Judge whether said terminal satisfies the switching condition between the preset IP Access Network, and when satisfying said switching condition, initiate the handoff request in the IMS territory;
The continuous server of said audio call comprises:
IMS territory handover module; Be used to receive the handoff request in the IMS territory of initiating at said terminal, and the signaling between said terminal and the continuous server of said audio call is switched on one of them the IP Access Network in said two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying at least.
Preferably, described IMS system, wherein, said audio call continuous control module comprises:
The signal energy detection module is used to detect the signal energy value of the wireless IP access network of current carrying VoIP conversation;
The signal energy judge module, be used to judge said detected said signal energy value whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
Preferably, described IMS system, wherein, said audio call continuous control module comprises:
The manual switchover control module; Be used to receive the IP Access Network switching command of user's input; And the signal of the Target IP Access Network of in said switching command that receives user input and said switching command, desiring to switch to is initiated the handoff request in the IMS territory when having reached the preset second network signal intensity threshold value.
Another aspect provides a kind of terminal, wherein, comprising:
AM access module is used for signing in to the IMS core net through at least two different wireless IP access networks access and registrations;
Audio call continuous control module; Be used for carrying out in the process of VoIP conversation said terminal through said at least two IP Access Networks; Judge whether said terminal satisfies the switching condition between the preset IP Access Network, and when satisfying said switching condition, initiate the handoff request in the IMS territory.
Another aspect provides a kind of audio call continuous server, wherein, comprising:
Redundant registration module is used at the terminal inserting through at least two different wireless IP access networks and registration when signing in to the IMS core net, writes down the mulitpath presence at said terminal;
IMS territory handover module; Be used in said terminal through said at least two IP Access Networks carries out the process of VoIP conversation, receiving the handoff request in the IMS territory of initiating at said terminal; And according to the said terminal mulitpath presence of said redundant registration module records, will and said terminal between signaling switch on one of them the IP Access Network in said at least two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying.
Technique effect of the present invention is:
The changing method of VoIP in the IMS territory of the embodiment of the invention; Through accomplish redundant many registrations at the preceding terminal of switching; Promptly accomplish through at least two different wireless IP access networks access and registrations and sign in to the IMS core net; Make the signaling of incoming terminal can have mulitpath to select, when satisfying between the preset IP Access Network switching condition like this at the terminal, the handoff request in the IMS territory can be initiated in the terminal; The VCC application server then can switch to the signaling between terminal and the VCC application server on above-mentioned one of them Access Network except that the Access Network of the said VoIP conversation of current carrying according to handoff request.Like this, realize the seamless switching of terminal VoIP in the IMS territory, reached the effect of the voice continuity of IMS VoIP between different WLAN, strengthened user experience.
Description of drawings
Fig. 1 is the VCC basic principle schematic;
Fig. 2 has increased the VCC basic principle schematic of switching between the WLAN;
Fig. 3 is the system principle sketch map of 3GPP VCC;
Fig. 4 is the schematic flow sheet of the changing method of VoIP in the IMS territory of one embodiment of the invention;
Fig. 5 is the schematic flow sheet of the changing method of VoIP in the IMS territory of another embodiment of the present invention;
Fig. 6 is the signaling process sketch map with the corresponding terminal of changing method embodiment illustrated in fig. 5 first intra in the IMS territory;
Fig. 7 is the structural representation of the IMS system of the embodiment of the invention;
Fig. 8 is the structural representation at the terminal of the embodiment of the invention;
Fig. 9 is the structural representation of the VCC application server of the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.
Fig. 4 is the schematic flow sheet of the changing method of VoIP in the IMS territory of one embodiment of the invention.Like Fig. 4, the changing method of this embodiment comprises:
Step 402 is carried out through one in above-mentioned two IP Access Networks in the process of VoIP conversation at the terminal at least, if the switching condition between the preset IP Access Network is satisfied at the terminal, then initiates the handoff request in the IMS territory;
The handover scheme of VoIP is the function expansion on 3GPP VCC scheme basis and strengthens in the IMS territory that the embodiment of the invention proposes, through terminal and VCC application server are two functions entity improvement of VCC Application and strengthen the seamless switching of realizing VoIP in the IMS territory.Seamless for realizing that the VoIP voice switch; Promptly realize the voice continuity of VoIP in the IMS territory, before the opportunity of switching, the terminal must be carried out following preparation in advance: sign in to IMS through different WLAN registrations; Redundant many registrations have promptly been accomplished; Exemplarily, as use identical or different public identify (PUI, Pulbic User Identity) registration signs in to IMS through different WLAN.Redundant many registrations make many connections of setting up when the signaling that arrives this terminal can have mulitpath promptly to register to select, for realizing that in the VoIP communication process seamless switching provides assurance in the terminal.The IMS core net of the embodiment of the invention is supported the redundancy registration at above-mentioned terminal.
Exemplarily, the wireless IP access network in the foregoing description can be WiFi and/or WiMax.The multimode terminals of above-mentioned terminal in the embodiment of the invention for supporting redundancy is registered more, exemplarily, like WiFi/WiMax dual-mode terminal or WiFi/WiMax/xG (x represents 2G, 2.5G, 3G) three mould terminals.
Exemplarily, in the step 401 in the foregoing description, the terminal is inserted and is registered the step that signs in to the IMS core net through at least two different IP Access Networks and comprises following several kinds of situations:
First kind of situation, the terminal obtains different IP addresses through different wireless IP access networks, and uses different privately owned sign (PVI, Private User Identity) to sign in to said IMS core net with identical PUI.
In this case, the terminal need at least two PVI number, can regard the user as and have at least two ISIM cards.Signing in to the IMS core net with the terminal through two different WLAN access net registrations is that example describes: the terminal need two PVI number, can be that a double-terminal such as mobile phone carry out voice and switch between two WLAN such as WiFi and WiMax; This situation also can be amplified between two terminals, carrying out voice and switched, such as, the user uses the WiFi terminal to dial voip phone earlier, under the condition of dropped calls not, voice is switched on another WiMax terminal on demand.
Second kind of situation, the terminal obtains different IP addresses through different WLAN Access Networks, and uses identical PVI to sign in to the IMS core net with different PUI.
The third situation, the terminal obtains different IP addresses through different WLAN Access Networks, and uses identical PVI to sign in to the IMS core net with identical PUI.
When signing in to the IMS core net for the terminal through above-mentioned several kinds of situations access and registration, the prerequisite that the method for the embodiment of the invention is implemented is that IMS core net support terminal carries out the redundancy registration through above-mentioned several kinds of situations.
In the above embodiment of the present invention, above-mentioned terminal can be the calling party of voip conversation, callee that also can voip conversation.Among this embodiment, the terminal is during as the calling party, and the terminal can select a kind of WLAN in above-mentioned at least two different wireless IP access networks to initiate voip phone, rises and exhales signaling to be anchored into VCC Application; The terminal is during as the callee, and the terminal can select a kind of WLAN in above-mentioned at least two different wireless IP access networks to answer voip phone.
In the above embodiment of the present invention; In the step 402; Handoff request in the IMS territory can be when switching condition is satisfied between the preset IP Access Network at the terminal, by the handoff request that initiate according to preset switchover policy automatically at the terminal, also can be the handoff request that the user manually initiates.Exemplarily, the WLAN Access Network that can cut at the terminal is two when above, and the terminal can be selected the Access Network of desire incision according to the switching priority that is provided with in advance.Exemplarily, if the Access Network that current terminal can be cut comprises: WiFi, WiMax and GSM, it is WiFi that the switching priority then can be set in advance>WiMax>GSM, promptly when above-mentioned three kinds of Access Networks all can be cut, preferred selection switched to WiFi.
In the above embodiment of the present invention; In the step 402; Preset access switching condition can be: the signal energy value such as the signal strength weakening of the wireless IP access network of current carrying VoIP conversation for example are attenuated to less than the first preset network signal intensity threshold value, also keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value.If satisfy this condition, then initiate the handoff request in the IMS territory.Concrete; Carry switching condition for this; In the step 402; Carry out through one in above-mentioned at least two IP Access Networks in the process of VoIP conversation at the terminal, the signal energy value of the wireless IP access network of current carrying VoIP conversation is detected at the terminal, and judge detected signal energy value whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal; Otherwise above-mentioned handoff request is not initiated at said terminal, or further judges whether to satisfy other preset switching condition.
In the above embodiment of the present invention, in the step 402, switching condition can also be between the preset IP Access Network: the terminal receives the order of the manual switchover IP Access Network of user's input.Should carry switching condition when satisfying; And when the network signal of the current Target IP Access Network of desiring to switch to satisfies predetermined condition; The user can be according to the wish of oneself; At any time between different Access Networks, switch, as between mobile network, WiFi or WiMax, switching, and guarantee to switch the continuity of back VoIP voice.Particularly; In the step 402; Carry out through one in above-mentioned at least two IP Access Networks in the process of VoIP conversation at the terminal, judge that the signal whether terminal receives the Target IP Access Network of desiring to switch in wireless IP access network switching command that the user imports and the said switching command has reached the second preset network signal intensity threshold value; In this way, then the handoff request in the IMS territory is initiated at the terminal.Exemplarily; In concrete the realization; Can on the terminal that possesses the VCC function, increase the operation interface of a manual switchover; This interface provides the option of user-operable, as network handover operation menu or button are provided, and the user can select between the current Target IP Access Network that can switch to through operating above-mentioned menu or button.For example; If user VoIP current IP Access Network is WiFi; Then switching menu perhaps can show " WiMax " through action button; Showing promptly that the user is current can switch to WiMax with the signaling between terminal and the VCC application server, and the user chooses " WiMax " option, realizes that so the VCC control module of VCC function will notify VoIP on the Target IP Access Network of desire incision, to rebulid calling.
When realizing the VCC function at terminal in the prior art, usually, the VCC service end is the login maintenance information that the service end of VCCApplication can be set up the terminal in the memory field, the presence at record terminal.Embodiments of the invention improve this function, increase to support redundant registration function, as through writing down the redundant registration function that the presence at terminal comes support terminal with PVI and PUI as the major key word.Second kind of situation with in the redundant registration of above-mentioned 3 kinds of the mentioning situation is example; Be that the user adopts same PVI and different PUI registered ims core net, pass through IMS core net third-party registration function so, registration message all is forwarded to the VCC application server; In the login tabulation that the VCC application server is safeguarded; In section sometime, then have two online records, represent different PUI registration respectively.Other situation is similar.In another embodiment, the VCC application server can also be with PVI and PUI as the presence of major key from home subscriber server (HSS, Home Subscriber Server) inquiry terminal.
About the indication of the objective network after switching, switch to the IMS territory in the CS territory of the 3GPP VCC norm-setting of prior art, be through switching the territory when rebuliding call signaling, carries differentiation through request unified resource identifier Request-URI.Because the embodiment of the invention relates in same IMS territory and switches, need expand new interface scheme at terminal and VCC application server.The embodiment of the invention can be switched the indication of back objective network through following two kinds of schemes:
Scheme one, the VCC application server decides in the IMS territory and switches, and change to another kind of target access network according to being arranged on the switchover policy on the VCC application server by the user through the v3 interface in advance;
Scheme two; The VCC application server increases IMS territory access network type; For the terminal can provide audio call continuous domain switching unified resource identifier separately through the every kind of Access Network that inserts the IMS core net is that URI (VDI, VCC Domain Transfer URI) is switched in the VCC territory; When the user was switched between different IP Access Networks, Request-URI was provided with different VDI.
Fig. 5 is the schematic flow sheet of the changing method of another embodiment of the present invention.In this embodiment, initiate to switch to example with calling party terminal first.The changing method of this embodiment comprises the steps:
Step 501, the terminal first is carried out the IMS registration respectively through two kinds of WLAN Access Networks, and this terminal first is that the WiFi/WiMax/GSM three that possesses the VCC function touches the terminal.
For realizing the VCC function in the IMS territory; The terminal first need be registered to IMS respectively through two kinds of IP Access Networks (IP-CAN, IP-Connectivity Access Network), and twice registration not necessarily accomplished simultaneously; As long as guarantee that when VCC switched, the terminal first signed in to IMS at purpose IP-CAN.
Step 502; The terminal nail root is chosen a kind of IP-CAN among above-mentioned two kinds of IP-CAN according to preset strategy, and WiFi for example is based on this Access Network; Initiation IMS rises and exhales invitation (INVITE) message; This message is anchored into VCC Application, supposes that the callee terminal use is second, and this moment, second used VoIP to receive calls.
In this step 502, preset strategy can adopt pre-configured mode, the mode that also can adopt the user manually to select.Exemplarily; Above-mentioned pre-configured mode; Can be that the user is that interface between VCC application server and the user terminal is arranged on the network configured priority among the VCCApplication through the v3 interface in advance; According to the priority of configuration, from above-mentioned two different WLAN Access Networks, select a carrying VoIP phone at least.
Step 503, sometime, if the terminal first satisfies the switching condition by WiFi → WiMax, exemplarily, as the user who holds the terminal first walks out the coverage of WiFi, and this terminal first is still covered by the WiMax signal, then IMS territory handoff request is initiated at the terminal; Exemplarily; Handoff request is initiated through the VCC control module notice VoIP client that is provided with on it in the terminal; The VoIP client is initiated INVITE again and is called out on WiMax, and the indication of switching target network adopts above-mentioned second kind of scheme, and promptly the VCC application server provides different VDI in above-mentioned at least two different radio IP Access Networks each; And carry the VDI of the target access network of desiring to switch in the handoff request in the IMS territory of initiating; Be the VDI that carries the target access network of desiring to switch at the Request-URI of the INVITE message related to calls of initiating again in this example, this VDI representes that aiming field still is IMS, in this example; The target access network of desiring to switch to is WiMax, and the VDI that the Request-URI of the INVITE message related to calls that this is initiated again carries is the corresponding VDI of WiMax.
Step 504; The INVITE message related to calls that VCC application server receiving terminal is initiated again; And from this INVITE message related to calls, take out the Request-URI value; And judge this INVITE that initiates again according to the switchover policy that is provided with in advance and call out and be handoff request, and the Access Network of current carrying VoIP being conversed according to the VDI value in the Request-URI value of taking out switches to target access network WiMax, and the VCC application server is pressed back-to-back user agent (B2BUA; Back-to-Back User Agent) function is revised message, is mapped to the other end from an end.
Step 505, the Access Network of terminal first carries out media consultation process with terminal second after switching again, and accomplishes the media protocol process between first, second two terminals.
Step 506, the INVITE that the VCC application server is initiated step 504 is again replied 200Ok and is replied, and the terminal first is returned final acknowledge message ACK.
Step 507, calling terminal first are accomplished the voice switching, continue to carry out voice communication course in the WiMax and the terminal second of new incision.Like this, realized between terminal first and the terminal second carrying out the seamless switching of VoIP exactly, guaranteed the voice continuity of VoIP conversation in the IMS territory.
Fig. 6 is the signaling process sketch map with the corresponding terminal of changing method embodiment illustrated in fig. 5 first intra in the IMS territory.Like Fig. 6, signaling process step 601 expression user terminal first and user terminal second are set up voip conversation through the IP Access Network, and exemplarily, this step is corresponding to above-mentioned steps 501 and 502; The expression of signaling process step 602 is determined the terminal first and is satisfied the condition of switching between the VoIP Access Network; Need switch; And pass through signaling process step 603 to IM CN subsystem entity (IM CNsubsystem entities) initiation session initiation protocol invite message related to calls (SIP INVITE again; Session Initiation Protocol INVITE); To VCC Application, exemplarily, 602-603 is corresponding to above-mentioned steps 503 for this signaling process step by anchor for this signaling; After signaling process step 604 expression terminal first is accomplished Access Network and switched, carry out the process of media negotiation again with terminal second, this step is corresponding to above-mentioned steps 505; Signaling process step 605-608 representes that the SIPINVITE message related to calls that the VCC application server is initiated the terminal first again replys, and returns final acknowledge message, corresponding to above-mentioned steps 606; The switching of VoIP voice is accomplished in step 607 expression, calling party's first, continues to utilize the Access Network after switching to carry out voice communication, and this step is corresponding to above-mentioned steps 507.
Fig. 5, the foregoing description shown in Figure 6 switch to example with caller, and in the time need switching the WLAN Access Network for terminal called second, situation is similar.That is, terminal second has been set up the VoIP conversation through two kinds of IP access net registrations to IMS core net and terminal first, second after, as judge terminal second and satisfy switching condition, then the step of its switching with above-mentioned step 503 to step 507.
Further; The VoIP changing method comprises that also VCCApplication exhales routing function eventually in the IMS territory of the embodiment of the invention; The user can be through the v3 interface with exhaling end the selected strategy in path to be kept at VCC Application; When the user had been registered to IMS through two kinds of perhaps two or more WLAN logins as called and user, VCC Application exhaled according to exhaling the end of user preset a kind of WLAN of Path selection to carry eventually.
Further; The method of VoIP seamless switching also comprises the whole routing function of exhaling in terminal in the described IMS of the embodiment of the invention territory; When the user has been registered to IMS through two kinds of perhaps two or more WLAN logins as called and user; VCC Application outbound call is handled through IMS core net bifurcated (Forking), and promptly for exhaling eventually respectively based on different WLAN links, a certain WLAN Access Network can be selected according to configuration preference in the terminal.
Fig. 7 is the structural representation of the IMS system of the embodiment of the invention.Like Fig. 7, the IMS system of this embodiment comprises: the continuous server of terminal and audio call (VCC Application), and this terminal comprises: AM access module is used for signing in to the IMS core net through at least two different wireless IP access networks access and registrations; The continuous VCC control module of audio call; Be used for carrying out in the process of VoIP conversation said terminal through said at least two Access Networks; Judge whether said terminal satisfies switching condition between the preset IP Access Network, and when satisfying said switching condition, initiate the handoff request in the IMS territory; The VCC application server comprises: IMS territory handover module; Be used to receive the handoff request in the IMS territory of initiating at said terminal, and the signaling between said terminal and said VCC application server is switched on one of them the IP Access Network in said two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying at least.
In the IMS system of this embodiment, the VCC control module at terminal comprises: the signal energy detection module is used to detect the signal energy value of the wireless IP access network of current carrying VoIP conversation; The signal energy judge module, be used to judge said detected said signal energy value whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
In the IMS system of this embodiment; Audio call continuous control module comprises: the manual switchover control module; Be used to receive the IP Access Network switching command of user's input; And the signal of the Target IP Access Network of in said switching command that receives user input and said switching command, desiring to switch to is initiated the handoff request in the IMS territory when having reached the preset second network signal intensity threshold value.
Fig. 8 is the structural representation at the terminal of the embodiment of the invention.The terminal of this embodiment comprises: AM access module is used for signing in to the IMS core net through at least two different wireless access networks access and registrations; The VCC control module; Be used for carrying out in the process of VoIP conversation said terminal through said at least two IP Access Networks; Judge whether said terminal satisfies the switching condition between the preset IP Access Network, and when satisfying said switching condition, initiate the handoff request in the IMS territory.
Fig. 9 is the structural representation of the VCC application server of the embodiment of the invention.The VCC application server of this embodiment comprises: redundant registration module, be used at the terminal inserting and registration when signing in to the IMS core net through at least two different wireless access networks, and write down the mulitpath presence at said terminal; IMS territory handover module; Be used in said terminal through said at least two IP Access Networks carries out the process of VoIP conversation, receiving the handoff request in the IMS territory of initiating at said terminal; And according to the said terminal mulitpath presence of said redundant registration module records, will and said terminal between signaling switch on one of them the IP Access Network in said at least two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying.
Preferably, the VCC application server of this embodiment writes down the presence at terminal as major key with privately owned sign and public identify.
Preferably, the VCC application server of this embodiment with privately owned sign and public identify as major key from home subscriber server inquiry terminal presence; Exemplarily, can be the presence at immediate inquiring terminal.
In the concrete realization of the embodiment of the invention, exemplarily, can bring in the seamless switching of accomplishing VoIP through the VCC control module and the VoIP software client that on the terminal, are provided with.The VCC control module is used for accomplishing the switching controls between the wireless access network, as accomplishing the switching controls between mobile network, WiFi, the WiMax.The VCC control module is obtained WiFi, WiMax, mobile network's signal energy value, judges whether to carry out handover operation through the switchover policy that is provided with in advance, as need to judge whether notice VoIP client to carry out handover operation.Particularly, if after the VCC control module is judged through switchover policy, need to switch, the VCC control module will notify the VoIP client on the target access network of desire incision, to rebulid calling so.
The technical scheme of the embodiment of the invention is applicable to the WLAN multi-module mobile terminal of GSM, WCDMA, TD-SCDMA standard, comprises smart mobile phone, PDA, PPC, MID etc.The WLAN multimode terminal of the embodiment of the invention is an example with WiFi, WiMax, but is not limited to this, is applicable to all WLAN access network types that 3GPP IMS is supported.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (13)
1. the changing method of VoIP in the IMS territory is characterized in that, comprises the steps:
Steps A, the terminal inserts through at least two different wireless IP access networks and registration signs in to the IMS core net;
Step B carries out through one in said two IP Access Networks in the process of VoIP conversation at said terminal at least, if the switching condition between the preset IP Access Network is satisfied at said terminal, then initiates the handoff request in the IMS territory;
Step C; Audio call continuous application server receives said handoff request, and the signaling between said terminal and the said audio call continuous application server is switched on one of them the IP Access Network in said two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying at least;
Wherein, said audio call continuous application server provides different voice to call out continuous domain in said at least two different IP Access Networks each to switch unified resource identifier VDI;
Among the said step B, carry the VDI of the target access network of desiring to switch in the handoff request in the IMS territory of said initiation; Be specially: said terminal is invited through making a call and is initiated said handoff request, and the VDI of the said target access network of desiring to switch to carries through the request unified resource identifier in the said calling invitation;
Among the said step C, said audio call continuous application server carries out said switching according to the VDI of the said target access network that carries in the said handoff request; Be specially: said audio call continuous application server is from the calling invitation that initiate at said terminal; Take out described request unified resource identifier, and with the signaling between said terminal and the said audio call continuous application server switch to described request unified resource identifier in the corresponding target access network of said VDI that carries.
2. changing method according to claim 1 is characterized in that, in the said steps A, said terminal signs in to the IMS core net through at least two different IP Access Networks accesses and registration and is:
Said terminal obtains different IP addresses through said different wireless IP access network, and uses different privately owned sign PVI to sign in to said IMS core net with identical public identify PUI;
Said terminal obtains different IP addresses through said different wireless IP access network, and uses identical privately owned sign PVI to sign in to said IMS core net with different public identify PUI; Or,
Said terminal obtains different IP addresses through said different wireless IP access network, and uses identical privately owned sign PVI to sign in to said IMS core net with identical public identify PUI.
3. changing method according to claim 1 is characterized in that, among the said step B, if switching condition between the preset IP Access Network is satisfied at said terminal, the step of then initiating the handoff request in the IMS territory comprises:
The signal energy value of the wireless access network of current carrying VoIP conversation is detected at said terminal;
The said detected signal energy value of said terminal judges whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
4. changing method according to claim 1 is characterized in that, among the said step B, if switching condition between the preset IP Access Network is satisfied at said terminal, the step of then initiating the handoff request in the IMS territory comprises:
Judge that the signal whether said terminal receives the Target IP Access Network of desiring to switch in IP Access Network switching command and the said switching command of user input has reached the second preset network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
5. according to claim 1 or 3 described changing methods, it is characterized in that, among the said step B, confirm said terminal satisfy preset IP Access Network switching condition after, initiate also to comprise before the said handoff request:
The IP Access Network desiring to switch to is confirmed at said terminal according to preset switching priority.
6. changing method according to claim 2 is characterized in that, in the said steps A, said terminal also comprises after signing in to the IMS core net through at least two different IP Access Networks accesses and registration:
Said audio call continuous application server writes down the presence at said terminal as major key with said privately owned sign and public identify; Or,
Said audio call continuous application server is inquired about said terminal presence as major key from home subscriber server with said privately owned sign and public identify.
7. changing method according to claim 1 is characterized in that, when said terminal is the callee of VoIP conversation, after said steps A, before the said step B, also comprises:
Said audio call continuous application server through exhaling routing strategy the end of v3 interface setting, selects an Access Network to carry said VoIP conversation according in advance at least from said two IP Access Networks.
8. changing method according to claim 1 is characterized in that, among the said step C, before carrying out said switching, also comprises:
Said audio call continuous application server is determined the step of the target access network of desiring to switch to according to being arranged on the switchover policy from one's body through the v3 interface in advance.
9. IMS system comprises: the continuous server of terminal and audio call, it is characterized in that,
Said terminal comprises:
AM access module is used for signing in to the IMS core net through at least two different wireless IP access networks access and registrations;
Audio call continuous control module; Be used for carrying out in the process of VoIP conversation said terminal through said at least two IP Access Networks; Judge whether said terminal satisfies the switching condition between the preset IP Access Network, and when satisfying said switching condition, initiate the handoff request in the IMS territory; Wherein, each in said at least two different IP Access Networks provides different voice and calls out continuous domain switching unified resource identifier VDI; Carry the VDI of the target access network of desiring to switch in the handoff request in the IMS territory of said initiation; Said audio call continuous control module is specially: invite through making a call and initiate said handoff request, the VDI of the said target access network of desiring to switch to carries through the request unified resource identifier in the said calling invitation;
The continuous server of said audio call comprises: IMS territory handover module; Be used to receive the handoff request in the IMS territory of initiating at said terminal, and the signaling between said terminal and the continuous server of said audio call is switched on one of them the IP Access Network in said two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying at least: be specially: the VDI according to the said target access network that carries in the said handoff request carries out said switching; More specifically be: from the calling invitation that initiate at said terminal; Take out described request unified resource identifier, and with the signaling between said terminal and the said audio call continuous application server switch to described request unified resource identifier in the corresponding target access network of said VDI that carries.
10. IMS according to claim 9 system is characterized in that said audio call continuous control module comprises:
The signal energy detection module is used to detect the signal energy value of the wireless IP access network of current carrying VoIP conversation;
The signal energy judge module, be used to judge said detected said signal energy value whether less than the first preset network signal intensity threshold value, and keep reaching Preset Time length less than the time span of the said first network signal intensity threshold value; In this way, the handoff request in the IMS territory is initiated at then said terminal.
11. IMS according to claim 9 system is characterized in that said audio call continuous control module comprises:
The manual switchover control module; Be used to receive the IP Access Network switching command of user's input; And the signal of the Target IP Access Network of in said switching command that receives user input and said switching command, desiring to switch to is initiated the handoff request in the IMS territory when having reached the preset second network signal intensity threshold value.
12. a terminal is characterized in that, comprising:
AM access module is used for signing in to the IMS core net through at least two different wireless IP access networks access and registrations;
Audio call continuous control module; Be used for carrying out in the process of VoIP conversation said terminal through said at least two IP Access Networks; Judge whether said terminal satisfies the switching condition between the preset IP Access Network; And when satisfying said switching condition, initiate the handoff request in the IMS territory: wherein, each in said at least two different IP Access Networks provides different voice and calls out continuous domain switching unified resource identifier VDI; Carry the VDI of the target access network of desiring to switch in the handoff request in the IMS territory of said initiation; Said audio call continuous control module is specially: invite through making a call and initiate said handoff request, the VDI of the said target access network of desiring to switch to carries through the request unified resource identifier in the said calling invitation.
13. the continuous server of audio call is characterized in that, comprising:
Redundant registration module is used at the terminal inserting through at least two different wireless IP access networks and registration when signing in to the IMS core net, writes down the mulitpath presence at said terminal;
IMS territory handover module; Be used in said terminal through said at least two IP Access Networks carries out the process of VoIP conversation, receiving the handoff request in the IMS territory of initiating at said terminal; And according to the said terminal mulitpath presence of said redundant registration module records, will and said terminal between signaling switch on one of them the IP Access Network in said at least two IP Access Networks, except that the IP Access Network of the said VoIP conversation of current carrying; In said at least two different IP Access Networks each provides different voice and calls out continuous domain switching unified resource identifier VDI; Said IMS territory handover module is specially: the VDI according to the said target access network that carries in the said handoff request carries out said switching; More specifically be: from the calling invitation that initiate at said terminal; Take out described request unified resource identifier, and with the signaling between said terminal and the said audio call continuous application server switch to described request unified resource identifier in the corresponding target access network of said VDI that carries.
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| EP2346299A1 (en) * | 2008-11-07 | 2011-07-20 | Panasonic Corporation | Handover method and mobile terminal and home agent used in the method |
| CN102238676B (en) | 2010-04-30 | 2014-02-19 | 华为技术有限公司 | Method for switching from circuit switching domain to packet switching domain, equipment and communication system |
| CN102740387B (en) * | 2012-07-06 | 2014-12-10 | 大唐移动通信设备有限公司 | Access point switching method and system |
| CN102984158B (en) * | 2012-12-04 | 2015-12-23 | 优视科技有限公司 | VOIP method for switching network, system and device |
| CN103957135A (en) * | 2014-04-24 | 2014-07-30 | 北京佳讯飞鸿电气股份有限公司 | Method for no-break conversation in IP address switching process |
| CN104168278A (en) * | 2014-08-15 | 2014-11-26 | 中国联合网络通信集团有限公司 | IMS intra-domain voice service switching method, device and system |
| CN105611578B (en) * | 2015-10-29 | 2019-04-12 | 东莞酷派软件技术有限公司 | Handle the method for switching network and network switching system when talk business |
| US10609613B2 (en) * | 2016-08-19 | 2020-03-31 | Qualcomm Incorporated | UE network mobility during IMS |
| SG11201903311XA (en) * | 2016-11-09 | 2019-05-30 | Mediatek Inc | Enhanced multimedia call control in next generation mobile communication systems |
| CN106804051B (en) * | 2016-12-30 | 2020-03-10 | 贵州财富之舟科技有限公司 | VoLTE and VoWiFi switching method and system |
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| WO2019084758A1 (en) * | 2017-10-31 | 2019-05-09 | Qualcomm Incorporated | Indirect single radio voice call continuity |
| CN110557789B (en) * | 2018-05-30 | 2021-12-24 | 展讯通信（上海）有限公司 | IMS (IP multimedia subsystem) implementation method and device supporting double IP (Internet protocol) bearers |
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