CN1937802A

CN1937802A - Method for speeding up wireless one-key-through calling establishment

Info

Publication number: CN1937802A
Application number: CN 200510029812
Authority: CN
Inventors: 田兴银; 吕玲; 许佰魁
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2005-09-20
Filing date: 2005-09-20
Publication date: 2007-03-28
Anticipated expiration: 2025-09-20
Also published as: CN100566440C

Abstract

The invention provides an accelerating method to establish the call of the wireless one-key done. In the non-call time, the server of the wireless one-key can get the information of the called users and remember it, When the called user location changes it can update the memory information; The program has the following advantages: 1. the call establishing speed is accelerated because the it can save the alternation between the call establishment and the user location server and the inquiring time; 2. it needn't change the original network structure, Using the ISC between the IP multimedia and the application server can finish the process after changing; 3. it has less change to the Wireless one-key done server.

Description

Accelerate the method for Push to talk over Cellular call setup

Technical field

The present invention relates to a kind of method of accelerating the Push to talk over Cellular call setup, relate to the Push to talk over Cellular technology of IP multimedia domain, MMD (IMS) technology of 3GPP definition.

Background technology

Push to talk over Cellular is a kind of business relatively harsher to delay requirement, the size of time delay directly influences the development of Push-to-talk over Cellular, the Push-to-talk over Cellular time-delay analysis is found, although its time delay is mainly from the air interface part, the time delay that core net produced also quite big (account for whole time delay 1/3).Especially seek the process of called subscriber's positional information, bigger to the time delay contribution of core net.

Fig. 1 is that the Push to talk over Cellular that this flow process of a typical called flow (core net part) based on 3GPP version 5 (3GPP/R5) IP multimedia domain, MMD Push-to-talk over Cellular has been described under the 1-1 pattern is called out, wherein caller is in different networks with called, by different Push to talk over Cellular server services, whole flow process is described below:

1: for Push to talk over Cellular server while in this is called out of caller service is also served as control Push to talk over Cellular server (Control PoC Server).Control Push to talk over Cellular server is according to the called user information of receiving, begin to seek called, determine called service Push to talk over Cellular server, because the Push to talk over Cellular server is as a kind of application server (Application Server) of 3GPP regulation, itself does not possess the number analysis function, control Push to talk over Cellular server sends by the CSCF (CSCF) to its service and invites (Inivte) message, removes to carry out signalling route by IP multimedia domain, MMD (IMS);

2, the 3:IP multimedia domain, MMD is responsible for correct called service Push to talk over Cellular server B that the Push to talk over Cellular call request is routed to;

4: after called service Push to talk over Cellular server B is received invitation message, need know called current position information, service call conversation control function (S-CSCF) the Push to talk over Cellular server B that is its service sends these information of information query to home subscriber server (HSS);

5: home subscriber server sends to the Push to talk over Cellular server B with the customer position information that inquiry obtains by message;

6: the Push to talk over Cellular server B sends to call request the service call conversation control function of serving into the called subscriber;

7, the 8:IP multimedia domain, MMD sends to terminal called according to the flow process of 3GPP with request.

Analyze this call flow, can find, per call is called, called service Push to talk over Cellular server B all must be gone the called positional information of home subscriber server inquiry, and user position information (mainly referring to service call conversation control function here, the notions such as route district of data field (PS)) has such characteristics:

1: the user can change in the process that moves, but its variation is not frequent.

2: positional information is stored in the home subscriber server (HSS).

Push to talk over Cellular server B calling procedure all is that per call is all gone the home subscriber server inquiry once to called subscriber's obtaining of positional information, this information of end of calling also is dropped, and the time delay that this query script causes accounts for suitable proportion in the time Yanzhong that whole core net causes.

If the Push to talk over Cellular server B can be known called positional information before calling, this calling mutual and home subscriber server that will save Push to talk over Cellular server B and home subscriber server is done the time that data query is handled so, accelerates whole call establishment.

Summary of the invention

Technical problem to be solved by this invention provides a kind of method of accelerating the Push to talk over Cellular call setup.

In order to solve the problems of the technologies described above the technical solution adopted in the present invention be: a kind of method of accelerating the Push to talk over Cellular call setup is provided, comprises the steps:

Step 1, in non-call time, the Push to talk over Cellular server obtains called subscriber's information and buffer memory in advance, renewable this cache information after called subscriber's positional information changes;

Step 2: control Push to talk over Cellular server is according to the called user information of receiving, begin to seek called, determine called service Push to talk over Cellular server, control Push to talk over Cellular server sends invitation message by the CSCF to its service, removes to carry out signalling route by the IP multimedia domain, MMD;

Step 3:IP multimedia domain, MMD is responsible for the correct Push to talk over Cellular server call request of will controlling and is routed to called service Push to talk over Cellular server;

Step 4: after called service Push to talk over Cellular server is received and invited request,, directly call request is sent to service call conversation control function into called subscriber's service according to the called current position information of its buffer memory;

Step 5:IP multimedia domain, MMD sends to terminal called according to the flow process of 3GPP with request.

This programme has following advantage:

1: speed call is set up speed, and the Push to talk over Cellular server upgrades user position information and buffer memory by obtaining in non-call time, has saved when call setup and home subscriber server mutual, and query script has shortened call set-up time;

2: do not change the legacy network structure, utilize the flow process after interface (ISC) between IP multimedia domain, MMD and the application server can be finished change.

3: change little to the Push to talk over Cellular server.

Description of drawings

Fig. 1 is the interacting message figure of existing Push to talk over Cellular call setup.

Fig. 2 is the interacting message figure of the registration of Push to talk over Cellular terminal of the present invention on service call conversation control function.

Fig. 3 is that called subscriber's letter of the present invention is put after the information change interacting message figure to the renewal of cache information.

Fig. 4 is the interacting message figure of the deletion of cache user information of the present invention.

Fig. 5 is the interacting message figure of Push to talk over Cellular call setup of the present invention.

Embodiment

In order to make the Push to talk over Cellular server obtain called subscriber's positional information fast, accelerate whole call establishment, following steps are proposed:

1: obtain called subscriber's information in advance and be buffered in the Push to talk over Cellular server B

As shown in Figure 2: the Push to talk over Cellular terminal is finished after the registration on the service call conversation control function, the service call conversation control function of its service this user's of notice (NOTIFY) message informing service Push to talk over Cellular server B, the Push to talk over Cellular server B is inquired about this user position information to home subscriber server, and for this user creates the positional information buffer area, the positional information that buffer memory obtains from home subscriber server.

2: called subscriber's positional information changes the renewal of back to cache information

Because user's mobility, for the service call conversation control function of its service can change, the IP multimedia domain, MMD can upgrade the service call conversation control function address that is stored in the home subscriber server, originally be service call conversation control function notice Push to talk over Cellular server B after user position information changes of this user's service, the Push to talk over Cellular server B goes home subscriber server to fetch new positional information of user and buffer memory (as shown in Figure 3) once more.

3. the deletion of cache user information

Behind user's shutdown or the cancellation Push-to-talk over Cellular, can be at the notes (Deregister) that disappear for the service call conversation control function of its service, service call conversation control function is after finishing user's the notes (Deregister) that disappear, notice Push to talk over Cellular server B, the Push to talk over Cellular server B is with this user position information deletion (as shown in Figure 4) in the buffer memory.

4. the Push to talk over Cellular call setup after the cache user information

As shown in Figure 5: the Push to talk over Cellular that this flow process has been described under the 1-1 pattern is called out, and wherein caller is in different networks with called, and by different Push to talk over Cellular server services, whole flow process is described below:

1: for Push to talk over Cellular server while in this is called out of caller service is also served as control Push to talk over Cellular server.Control Push to talk over Cellular server is according to working the called user information of receiving, begin to seek called, determine called service Push to talk over Cellular server B, because the Push to talk over Cellular server B is as a kind of application server (Application Server) of 3GPP regulation, itself does not possess the number analysis function, control Push to talk over Cellular server sends by the CSCF to its service and invites (Inivte) message, removes to carry out signalling route by the IP multimedia domain, MMD;

2, the 3:IP multimedia domain, MMD is responsible for the correct Push to talk over Cellular server call request of will controlling and is routed to called service Push to talk over Cellular server B;

4: after called service Push to talk over Cellular server B is received and invited request,, directly call request is sent to service call conversation control function into called subscriber's service according to the called current position information of its buffer memory;

5, the 6:IP multimedia domain, MMD sends to terminal called according to the flow process of 3GPP with request.

Claims

1, a kind of method of accelerating the Push to talk over Cellular call setup is characterized in that, comprises the steps:

2, the method for quickening Push to talk over Cellular call setup according to claim 1, it is characterized in that, described step 1 is specially: the Push to talk over Cellular terminal is finished after the registration on the service call conversation control function, the service call conversation control function of its service is notified this user's service Push to talk over Cellular server with notification message, the Push to talk over Cellular server is inquired about this user position information to home subscriber server, and for this user creates the positional information buffer area, the positional information that buffer memory obtains from home subscriber server; Service call conversation control function is notice Push to talk over Cellular server after user position information changes, and the Push to talk over Cellular server goes home subscriber server to fetch new positional information of user and buffer memory once more.

3, the method for quickening Push to talk over Cellular call setup according to claim 1, it is characterized in that, described step 1 also comprises: service call conversation control function is after finishing user's the notes that disappear, notice Push to talk over Cellular server, the Push to talk over Cellular server is with this user position information deletion in the buffer memory.