CN101489268A - Mobile terminal call fast switching method based on SIP - Google Patents
Mobile terminal call fast switching method based on SIP Download PDFInfo
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- CN101489268A CN101489268A CNA2008100561621A CN200810056162A CN101489268A CN 101489268 A CN101489268 A CN 101489268A CN A2008100561621 A CNA2008100561621 A CN A2008100561621A CN 200810056162 A CN200810056162 A CN 200810056162A CN 101489268 A CN101489268 A CN 101489268A
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Abstract
The present invention provides a mobile terminal session quick switching method based on session initiation protocol. In the method, the strength threshold of signal is firstly set. At the state that the wireless network is generated with sub-network switching, the adjacent access point is researched once the signal of present wireless access point fades below the threshold. If a new wireless access point obtains the requirement of accessing, a new wireless interface and a new wireless access point are used for calling under the precondition that the original calling between the original wireless interface and present wireless access point is reserved. After the new wireless interface is configured, the original wireless interface is released and the original calling is ended. The invention can effectively reduce or even eliminate the session interruption time when the node moves through minimum changing to the existing SIP protocol, and guarantees the real-time updating of position state of mobile node.
Description
Technical field
The present invention relates to a kind of when wireless network switches, make portable terminal realize the conversation fast switching method, relate in particular to a kind of at employing conversation initialized protocol (Session InitiationProtocol, be abbreviated as Session Initiation Protocol) in the wireless network that communicates, make portable terminal realize call fast switching method under the mobile status, belong to the wireless local area network technology field.
Background technology
Session Initiation Protocol and agreement H.323 are most widely used two big signaling protocol standards in VoIP at present.Session Initiation Protocol is described to generating, revise and terminate session between one or more participants.For the user, because Session Initiation Protocol combine closely with the Internet, and the support of multimedia access support, mobile communication all there is remarkable advantages, so more meets the requirement of following communication.
At the actual needs of mobile network's development, IETF (Internet engineering duty group) has proposed the Internet mobility solution-Mobile SIP based on application layer.Mobile SIP mainly is by signaling method, data flow and signaling flow is separated, and has realized mobility.But in this solution, for ambulant support, the SIP signaling must take the UDP mode to transmit, and has cancelled the support of SIP to TCP itself.And, move switching flow with reference to the caller of Mobile Session Initiation Protocol shown in Figure 1.If portable terminal has taken place to move in communication process, unavoidably can cause the temporary interruption of conversation, its break period is usually more than 10 seconds.And also there is delay issue in the register update mechanism of its portable terminal after moving.So how to transform the Mobile Session Initiation Protocol, make it support the TCP transmission means again and reduce even the dropped calls time when eliminating portable terminal and moving, accomplishing the real-time update of login mechanism, is a very important problem, it is furtherd investigate be significant.
On the other hand, carry out the inexorable trend that has become development communication technologies such as multimedia services such as voice and videos at portable terminal.Compare with technology such as 3G, IEEE 802.11 WLAN (wireless local area network) (Wi-Fi) technology can provide higher channel width and networking mode flexibly, and the application aspect the Internet wireless access more and more widely.Yet in traditional IP technology, different main frames need intercom with tcp port number mutually based on fixed IP addresses.During communication was carried out, IP address and tcp port number must remain unchanged, otherwise can't guarantee communication continuity.In addition, switching of the link layer of process and network layer handoff procedure can produce bigger time delay (generally in level second) when switching between subnet owing to portable terminal, and this also can't provide satisfied support for the voice and video business to time-sensitive.Particularly under foundation structure (infrastructure) pattern of Wi-Fi, because the handoff procedure of link layer does not provide enough information for network layer, make network layer can't in time understand the switch instances of link layer, caused the time delay of whole handoff procedure further to increase.
The handoff procedure of tradition WLAN is:
1. the portable terminal that need switch is by self scanning all channels, perhaps determines the target AP that will switch to by the information of the relevant neighbor AP that local AP provided;
2. this portable terminal disconnects and being connected of former AP, and authenticates with target AP, related;
3. this portable terminal after switching sends QoS to target AP asks to apply for resource.
Though the handoff procedure of tradition WLAN also can be successful, because handoff delay is big or not necessarily success of resource bid, can cause the interruption of transfer of data, cause whole network throughput sharply to descend.
Summary of the invention
In view of the existing in prior technology deficiency, the object of the present invention is to provide a kind of mobile terminal call fast switching method based on Session Initiation Protocol.It is quicker that this method can make the portable terminal such as mobile phone, palmtop PC converse when wireless network switches to switch, and state upgrades more timely.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of mobile terminal call fast switching method of dialogue-based initializtion protocol, described portable terminal have two wave points at least, it is characterized in that:
(1) signalization intensity threshold at first;
(2) in wireless network, occurred under the situation of subnet switching, in case the signal of current wireless access point is weak under described threshold value, near the WAP (wireless access point) then searching for;
(3), then under the prerequisite that keeps the original calling between original wave point and the described current wireless access point, enable new wave point and described new WAP (wireless access point) calls out if there is new WAP (wireless access point) to reach the requirement that inserts;
(4) treat that the configuration of described new wave point finishes after, discharge described original wave point and finish described original calling.
Wherein, in described step (3), in enabling the new calling that wave point carried out, call identification is associated with the call identification of described original calling.
In described step (4), after server is received described calling, discharge original calling passage, the conversation initialized protocol data flow with other end portable terminal is redirected to the current calling passage of described portable terminal then.
In addition, after described portable terminal moves to reposition, initiate the positional information in registration and the renewal location server at once.
The minimum change of mobile terminal call fast switching method provided by the present invention by existing Session Initiation Protocol is carried out can effectively reduce even the dropped calls time when eliminating node motion, and the real-time update of assurance positions of mobile nodes state.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is that the switching flow schematic diagram is moved in the caller of traditional Mobile Session Initiation Protocol;
Fig. 2 is that the switching flow schematic diagram is moved in the caller after the present invention improves;
Fig. 3 is the called mobile switching flow schematic diagram after the present invention improves.
Embodiment
The present invention adopts the technological thought that is similar to resource reservation, traditional Session Initiation Protocol that portable terminal is used when wireless network switches improves, dropped calls time when reduction even elimination portable terminal move, and the real-time update of assurance mobile terminal locations state.
Particularly, mainly this has carried out the necessary technology improvement aspect two at portable terminal switching mode and SIP conversation handoff protocol in the present invention.
Aspect the portable terminal switching mode, at first to make portable terminal have two wave points at least.This is that those of ordinary skills are easy to realize, does not repeat them here.
1) if the situation that subnet switches has taken place in wireless network, portable terminal keeps original wave point when switching, enable a new wave point in addition simultaneously and insert in the new subnet.After treating that the whole configurations of new wave point finish, discharge original wave point again.
2) in the process that subnet switches, not just to insert new network after waiting for original network connection failure, but a signal strength threshold is set.In case the signal of current access point is weak after to a certain degree, near the WAP (wireless access point) the search at once.If have WAP (wireless access point) to reach the requirement that inserts, directly use other wave point to be connected to this WAP (wireless access point).
Aspect SIP conversation handoff protocol, the present invention has carried out following modification to original conversation handoff protocol:
1) calls out switching and in original calling passage, do not carry out, substitute original calling but initiate a new calling.In the calling of new initiation, call identification is associated with original call identification, so that new calling of identification is that original terminal moves the back initiation.After server is received new calling, discharge original calling passage, the RTP data flow with other end portable terminal is redirected to the current calling passage of this portable terminal then.
2) after portable terminal moves to reposition, initiate the positional information in registration and the renewal location server at once, rather than upgrade positional information again after the Waiting for Call end.
Below, describe concrete implementation step of the present invention in detail by concrete calling procedure example.
Fig. 2 shows is that handoff procedure is moved in caller after the present invention improves, and this handoff procedure comprises the steps:
(1) caller sends INVITE to server, and CALLID is callid, and caller is caller, and called is callee;
(2) after server is received INVITE, reply 100 Trying message to caller at once;
(3) server is to called forwarding INVITE;
(4) called receive INVITE after, at once reply 100 Trying message to server;
(5) called beginning ring, and send 180 Ringing message to server;
(6) server is given caller with 180 forwards;
(7) called off-hook sends 200 OK response to server simultaneously;
(8) after server is received 200 OK, to called transmission ACK acknowledge message;
(9) server is transmitted 200 OK response to caller;
(10) after 200 OK are received in caller, send the ACK acknowledge message to server;
This moment, conversation was set up, and it not is direct connection that the RTP of calling and called connects, but transmits via server.
When calling mobile terminal has taken place to move, under the situation that original connection is not interrupted, because the quality of original connection has been lower than threshold value, the new wave point of portable terminal utilization has obtained new IP, and revised the default route of system, but original connection this moment continues still to keep.
(11) the new IP of caller utilization initiates the REGISTER request, to the reposition of server registration oneself;
(12) after server is received REGISTER message, reply 100 Trying message to caller at once;
(13) after server is found calling number in system, upgrade caller location, reply 200 OK response to caller;
(14) the new IP of caller utilization has initiated new INVITE request, and the CALLID of calling is callid_1, and caller is caller, and called is callee;
(15) after server is received INVITE, reply 100 Trying message to caller at once;
Whether server is searched to exist in system and is called out relevant calling (number of calling and called is identical, and CALLID only differs a suffix) therewith.After finding original calling, enter the calling switching flow of portable terminal.
(16) server is directly replied 200 OK message to caller;
(17) server is replied BYE message to original IP port of portable terminal;
After this step, server is forwarded to called RTP data flow on the new IP of portable terminal
(18) after the SIP listening port on the original IP of portable terminal is received BYE message, reply 200OK message.
After this step, portable terminal cuts off original calling, discharges original IP.
(19) after the SIP listening port on the new IP of portable terminal is received 200 OK, reply the ACK acknowledge message at once;
Like this, server carries out RTP the new IP of portable terminal and called to be transmitted, and calls out to switch to finish.
The called mobile handoff procedure that shown in Figure 3 is after the present invention improves.This process moves handoff procedure with caller shown in Figure 2 and compares, different only be that replacing has taken place for caller, called position, remaining each step comes down to consistent, has not just given unnecessary details in detail at this.
More than the mobile terminal call fast switching method of dialogue-based initializtion protocol provided by the present invention is had been described in detail.For one of ordinary skill in the art, any conspicuous change of under the prerequisite that does not deviate from connotation of the present invention it being done all will constitute to infringement of patent right of the present invention, with corresponding legal responsibilities.
Claims (4)
1. the mobile terminal call fast switching method of a dialogue-based initializtion protocol, described portable terminal has two wave points at least, it is characterized in that:
(1) signalization intensity threshold at first;
(2) in wireless network, occurred under the situation of subnet switching, in case the signal of current wireless access point is weak under described threshold value, near the WAP (wireless access point) then searching for;
(3), then under the prerequisite that keeps the original calling between original wave point and the described current wireless access point, enable new wave point and described new WAP (wireless access point) calls out if there is new WAP (wireless access point) to reach the requirement that inserts;
(4) treat that the configuration of described new wave point finishes after, discharge described original wave point and finish described original calling.
2. the mobile terminal call fast switching method of dialogue-based initializtion protocol as claimed in claim 1 is characterized in that:
In described step (3), in enabling the new calling that wave point carried out, call identification is associated with the call identification of described original calling.
3. the mobile terminal call fast switching method of dialogue-based initializtion protocol as claimed in claim 1 is characterized in that:
In described step (4), after server is received described calling, discharge original calling passage, the conversation initialized protocol data flow with other end portable terminal is redirected to the current calling passage of described portable terminal then.
4. the mobile terminal call fast switching method of dialogue-based initializtion protocol as claimed in claim 1 is characterized in that:
After described portable terminal moves to reposition, initiate the positional information in registration and the renewal location server at once.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100561621A CN101489268A (en) | 2008-01-14 | 2008-01-14 | Mobile terminal call fast switching method based on SIP |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100561621A CN101489268A (en) | 2008-01-14 | 2008-01-14 | Mobile terminal call fast switching method based on SIP |
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| CN101489268A true CN101489268A (en) | 2009-07-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102036201A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Incoming call prompting method and device |
| CN102118526A (en) * | 2009-12-30 | 2011-07-06 | 北京大唐高鸿数据网络技术有限公司 | VoIP (Voice over Internet Protocol) media communication method based on SIP (Session Initiation Protocol) |
| CN102573008A (en) * | 2011-12-20 | 2012-07-11 | 福建新大陆电脑股份有限公司 | Network connection method for electronic scales and electronic scale adopting same |
-
2008
- 2008-01-14 CN CNA2008100561621A patent/CN101489268A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102036201A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Incoming call prompting method and device |
| CN102118526A (en) * | 2009-12-30 | 2011-07-06 | 北京大唐高鸿数据网络技术有限公司 | VoIP (Voice over Internet Protocol) media communication method based on SIP (Session Initiation Protocol) |
| CN102573008A (en) * | 2011-12-20 | 2012-07-11 | 福建新大陆电脑股份有限公司 | Network connection method for electronic scales and electronic scale adopting same |
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Application publication date: 20090722 |