CN101217797B - A realization method of call starting in IP multimedia subsystem centralized control operation - Google Patents
A realization method of call starting in IP multimedia subsystem centralized control operation Download PDFInfo
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- CN101217797B CN101217797B CN2008100018264A CN200810001826A CN101217797B CN 101217797 B CN101217797 B CN 101217797B CN 2008100018264 A CN2008100018264 A CN 2008100018264A CN 200810001826 A CN200810001826 A CN 200810001826A CN 101217797 B CN101217797 B CN 101217797B
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Abstract
The invention provides a calling method of an IP multimedia sub-system integral control service. A calling terminal initiates a session request to a called terminal through a session control path and a carrying control path by using session information; after receiving the session request in the carrying control path, a VMSC redirects the session request to an ICCF; after receiving the session request of the carrying control path, the ICCF serves as a B2BUA of the calling terminal to send a call to the called terminal and associates the session request in the carrying control path by using the session information after receiving the session request in the session control path; the session information comprises a called terminal number. The invention uses the number of the called UE in the session request in the carrying control path, and redirects the session request to the ICCF through the VMSC; the ICCF directly sends a call to the called UE according to the number of the called UE and the establishment time of the call is reduced.
Description
Technical field
The present invention relates to the communications field, relate in particular to the call method that rises of a kind of IP (Internet Protocol, Internet Protocol) IP multimedia subsystem, IMS centralized control business.
Background technology
IP Multimedia System (IP Multimedia Subsystem, be called for short IMS) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, it has made up an opening and service environment flexibly, support multimedia application, can be the user abundant multimedia service is provided.
IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, GPRS), WLAN (Wireless LocalArea Network, WLAN (wireless local area network)) etc. packet access network provides outside the business, can also be GSM (Global System for Mobile communications, global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit switching (CircuitSwitched is called for short CS) territory, can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).
The IMS centralized traffic has the following advantages:
(1) IMS is that access waies such as circuit commutative field, packet switching (Packet Switch is called for short PS) territory provide consistent business, and network enabled merges;
(2) support the CS network to the evolution of IMS network;
(3) not only support to have ICS ability subscriber equipment, also support the existing subscriber equipment that does not possess the ICS ability.
According to the difference of session control path bearing mode, the implementation of IMS centralized traffic is divided into CS territory control mode (be called not only I1-cs mode) and PS territory control mode (but also being called the I1-ps mode).
1) I1-ps mode: this moment, user terminal inserted IMS by CS territory and PS territory.But its PS territory is inserted and is adopted low speed IP to insert, and speech business can not be provided.Fig. 1 is the Organization Chart of I1-ps mode.
2) I1-cs mode: this moment, UE only inserted IMS by the CS territory.Fig. 2 is the Organization Chart of I1-cs mode.
The implementation of above-mentioned two kinds of IMS centralized traffic comprises following network element:
101: user terminal (User Equipment is called for short UE);
102: Visited Mobile Switching Center (Visited Mobile Switch Center is called for short VMSC);
103: MGCF (Media Gateway Control Function is called for short MGCF);
104: CSCF (Call Session Control Function is called for short CSCF);
105: media gateway (Media Gateway is called for short MGW);
106:IMS circuit domain control function (IMS CS Control Function is called for short ICCF), in the IMS territory, ICCF is application server (Application Server is called for short AS) simultaneously;
107: home subscriber server (Home Subscriber Server is called for short HSS).
As shown in Figure 1, 2, UE inserts IMS and need set up 3 logical paths with ICCF: session control path, carrying control path and bearer path.
As mentioned above, there are following two kinds of bearing modes in the session control path:
(1) is carried on the PS territory, adopts session initiation protocol (Session Initial Protocol is called for short SIP), arrive ICCF, set up PS session control path, shown in the I1-ps mode of Fig. 1 through the CSCF in IP bearer network, the IMS territory;
(2) be carried on the CS territory, adopt unstructured supplementary service data (UnstructuredSupplementary Service Data is called for short USSD), arrive ICCF, set up CS session control path through VMSC and HSS; Shown in the I1-cs mode of Fig. 2.
Carrying control path: UE adopts the CS control signaling of standard to insert VMSC, and is linked into IMS by MGCF; Wherein, VMSC arrives MGCF by integrated digital service-user part signaling (ISDN User Part is called for short ISUP), and then adopts session initiation protocol (Session Initial Protocol is called for short SIP) signaling to arrive ICCF by CSCF.
Bearer path: UE is linked into IMS by VMSC and MGW, sets up bearer path, sets up medium with the remote user equipment of session and is connected.
The session control path is used for transmitting session control information between UE, CSCF and ICCF, and the CS control signaling of standard and the bear control information between SIP signaling transmission CS territory and the IMS territory are adopted in carrying control path, and these two control paths are associated in ICCF at last; ICCF carries out association with the session on these two paths, and becomes a session to the far-end transmission two merged session (combine).In addition, the foundation of bearer path and the management of bearing resource are also being controlled in carrying control path.
Fig. 3 is that ICS of the prior art plays the call method flow chart, specifically comprises following steps:
301) rise and exhale terminal UE-A on the session control path, to initiate a session request, send session control information to ICCF;
Comprise session information in the above-mentioned conversation request; Comprise in the session information: exhale the number of terminal UE-B eventually, or the number of the number of UE-A and UE-B.
Step 301 has been summarized the step of setting up calling under I1-cs and the I1-ps dual mode on the session control path.
302) UE-A sends setup requests in the CS territory to VMSC;
The called number of above-mentioned setup requests is the ICCF number, the number of ICCF be in configured in advance in UE-A, perhaps obtain in when registration by UE.
It should be noted that step 301 and 302 is concurrent execution.
303) after VMSC receives above-mentioned setup requests, send the ISUP initial address message to MGCF, the called number of this message is the ICCF number;
304) after MGCF receives the ISUP initial address message, send the SIP conversation request to CSCF;
305) CSCF is transmitted to ICCF according to initial filter standard or norm (initial Filter Criteria is called for short iFC) with above-mentioned SIP conversation request;
306) after the SIP conversation request that sends in conversation request on the session control path that in receiving step 301, sends of ICCF and the step 305, according to session information the session that path and carrying control on the path is controlled in session and carried out related; ICCF has served as the agency back-to-back (Back to BackUser Agent is called for short B2BUA) who exhales UE (UE-A), exhales UE (UE-B) to send the SIP conversation request to end, and this call request at first is forwarded to CSCF;
307) CSCF is forwarded to UE-B (subsequent step omission) with above-mentioned SIP conversation request.
Exhale flow process as can be seen from the ICS of above-mentioned prior art, session on the session control path (step 301) and carrying control path (step 302～305) though on session be concurrent initiation, but, therefore must after receiving session on the session control path, ICCF could continue calling because the session on the carrying control path lacks the number of exhaling UE eventually.When the session control path velocity is slow (adopt the GPRS of low speed to insert such as the I1-ps mode, perhaps the USSD speed of I1-cs mode is slow), the call establishment time can be long.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, proposes a kind of call method that rises of the IP Multimedia System centralized control business that reduces call set-up time.
In order to address the above problem, the invention provides a kind of call method that rises of IP Multimedia System centralized control business, rise and exhale terminal to use session information to exhale terminal to initiate a session request to end in session control path and carrying control path; VMSC is redirected to ICCF with it after receiving conversation request on the described carrying control path; ICCF serves as described and exhales the B2BUA of terminal to exhale terminal to make a call to end after receiving conversation request on the described carrying control path; And after the conversation request that receives on the described session control path, use described session information to carry out related with the conversation request on the described carrying control path it; Described session information comprises exhales termination number eventually.
In addition, VMSC adopts following steps that it is redirected to ICCF after having received the conversation request of exhaling on the described carrying control path that terminal sends:
A:VMSC sends initial monitoring point message to ICCF, comprises described session information in this message;
B:ICCF preserves described session information after receiving this initial monitoring point message, distributes the interim routing number of IMS of ICCF, and the connection message that will comprise the interim routing number of this IMS is sent to VMSC;
C:VMSC uses the interim routing number of described IMS that the conversation request on the described carrying control path is sent to ICCF.
In addition, step C is divided into following substep:
C1:VMSC sends the ISUP initial address message to MGCF, and the called number of this message is the interim routing number of described IMS;
C2:MGCF sends the SIP conversation request by CSCF to ICCF after receiving the ISUP initial address message, and the called number of this request is the interim routing number of described IMS;
Also comprise following steps after the step C2:
D:ICCF obtains the described session information of preservation after receiving the SIP conversation request of described MGCF transmission according to the interim routing number of described IMS that wherein comprises;
E:ICCF uses exhale the called number of termination number as described SIP conversation request the described end that comprises in the described session information, exhales terminal to make a call to described end.
In addition, also comprise following steps between step D and the E:
D1:ICCF judges whether to receive the conversation request on the relevant described session control path of described session information, if receive, then use described session information to carry out related with the SIP conversation request that described MGCF sends the conversation request on the described session control path.
In addition, also comprise following steps after the step e:
After F:ICCF receives conversation request on the described session control path, use the described session information that wherein comprises to carry out its SIP conversation request related with paid-in described MGCF transmission.
In addition, in the steps A, VMSC triggers the intelligent dialing trigger, sends described initial monitoring point message by gsmSCF to ICCF by this intelligent dialing trigger;
Among the step B, ICCF is sent to VMSC by gsmSCF with described connection message after receiving this initial monitoring point message.
In addition, exhale terminal when circuit domain is registered for described, VMSC downloads described intelligent dialing trigger from HLR.
In addition, described session information also comprises described number of exhaling terminal.
In addition, described session control path is I1-cs or I1-ps.
In addition, exhaling termination number described end is the number of TEL form E.164.
In sum, the present invention is by using the number of exhaling UE eventually in the conversation request on carrying control path, and this conversation request being redirected to ICCF by VMSC, ICCF has reduced the time of call establishment according to exhaling the number of UE directly to exhale UE to make a call to end eventually.
Description of drawings
The professional I1-ps Organization Chart of the IMS centralized control that Fig. 1 is;
The professional I1-cs Organization Chart of the IMS centralized control that Fig. 2 is;
Fig. 3 is the professional call method flow chart that rises of IMS centralized control in the prior art;
Fig. 4 adopts a call method flow chart of I1-ps mode for first embodiment of the invention;
Fig. 5 adopts a call method flow chart of I1-cs mode for second embodiment of the invention.
Embodiment
Core concept of the present invention is, rises and exhales the called number of the session (callings) that UE initiates in session control path and carrying control path all to use the number of exhaling UE eventually, and the sequencing difference according to above-mentioned two sessions arrival ICCF is divided into following two kinds of situations:
If a) session on the session control path arrives earlier ICCF, after then the session on the control to be lifted path such as ICCF arrives, association is carried out in two sessions, and become a session to exhale UE to make a call two merged session to end;
B) if the session on the carrying control path arrives ICCF earlier, because the session control path is mainly used in supplementary service, so ICCF need not to wait for the session in session control path, directly exhales UE to make a call to end; After the session in session control path arrived, ICCF carried out association with these 2 sessions and gets final product.
Describe the present invention below in conjunction with drawings and Examples.
Fig. 4 adopts a call method flow chart of I1-ps mode for first embodiment of the invention.As shown in Figure 4, this method comprises following steps:
401) ICS user terminal UE-A exhales user terminal UE-B to make a call in the CS territory to end; Be that UE-A sends setup requests to VMSC on carrying control path, the called number of this request is the number of UE-B;
402) after VMSC receives above-mentioned setup requests, trigger the intelligent dialing trigger of UE-A, this intelligent dialing trigger sends initial monitoring point message to gsmSCF; GsmSCF gives ICCF with this forwards;
Above-mentioned initial monitoring point message is carried session information, and session information can be called number (number of UE-B), also can be called number and calling number (number of UE-A);
Above-mentioned called number is the number of TEL form E.164;
Above-mentioned intelligent dialing trigger is that UE-A VMSC when circuit domain is registered downloads from HLR (HomeLocation Register, attaching position register).
403) after ICCF receives above-mentioned initial monitoring point message, preserve the session information that carries in this message, distribute IMRN (the interim routing number of IMS), this IMRN is included in the connection message sends to VMSC then by gsmSCF;
404) VMSC uses the IMRN in the connection message of receiving, sends the ISUP initial address message to MGCF, and the called number of this message is the IMRN of this ICCF;
405) after MGCF receives the ISUP initial address message, send the SIP conversation request message to CSCF, the called number of this request is above-mentioned IMRN;
406) after CSCF receives above-mentioned SIP conversation request message, give ICCF with this forwards;
407) ICCF takes out the session information of preserving in the step 403 according to the IMRN in the above-mentioned SIP conversation request message, judges whether to receive the conversation request on the session control path relevant with this session information:
If do not receive the conversation request on the session control path relevant with this session information, then ICCF serves as B2BUA, and the called number in the above-mentioned SIP conversation request is replaced to UE-B, continues to send conversation request to UE-B;
If received the conversation request on the session control path relevant with this session information, then ICCF gets up these two session associations, and serve as B2BUA, the called number in the above-mentioned SIP conversation request is replaced to UE-B, continue to send conversation request to UE-B;
Send to the above-mentioned conversation request of UE-B and at first send to CSCF.
408) the CSCF above-mentioned conversation request that will receive is transmitted to UE-B;
409) when carry out step 401, on the session control path, promptly on the PS territory, UE-A sends conversation request to UE-B, and this request at first sends to CSCF;
Comprise session information (number of UE-B, or the number of UE-A and UE-B) in this conversation request.
410) CSCF is transmitted to ICCF with the conversation request of receiving; After ICCF receives this conversation request, judge whether to receive conversation request on the relevant carrying control path according to the session information that wherein comprises:
If do not receive, the then arrival of the SIP conversation request on the control to be lifted path such as ICCF; If receive, then to use session information that this session control path and the session on the sessions carry path are carried out related for ICCF, and session is controlled session on the path as the session control branch of the session on the carrying control path.
Fig. 5 adopts a call method flow chart of I1-cs mode for second embodiment of the invention.As shown in Figure 5, this method comprises following steps:
501) ICS user terminal UE-A exhales user terminal UE-B to make a call in the CS territory to end; Be that UE-A sends setup requests to VMSC on carrying control path, the called number of this request is the number of UE-B;
502) after VMSC receives above-mentioned setup requests, trigger the intelligent dialing trigger of UE-A, this intelligent dialing trigger sends initial monitoring point message to gsmSCF; GsmSCF gives ICCF with this forwards;
Above-mentioned initial monitoring point message is carried session information, and session information can be called number (number of UE-B), also can be called number and calling number (number of UE-A);
Above-mentioned intelligent dialing trigger is that UE-A VMSC when circuit domain is registered downloads from HLR (HomeLocation Register, attaching position register).
503) after ICCF receives above-mentioned initial monitoring point message, preserve the session information that carries in this message, distribute IMRN (the interim routing number of IMS), this IMRN is included in the connection message sends to VMSC then by gsmSCF;
504) VMSC uses the IMRN in the connection message of receiving, sends the ISUP initial address message to MGCF, and the called number of this message is the IMRN of this ICCF;
505) after MGCF receives the ISUP initial address message, send the SIP conversation request message to CSCF, the called number of this request is above-mentioned IMRN;
506) after CSCF receives above-mentioned SIP conversation request message, give ICCF with this forwards;
507) ICCF takes out the session information of preserving in the step 503 according to the IMRN in the above-mentioned SIP conversation request message, judges whether to receive the conversation request on the session control path relevant with this session information:
If do not receive the conversation request on the session control path relevant with this session information, then ICCF serves as B2BUA, and the called number in the above-mentioned SIP conversation request is replaced to UE-B, continues to send conversation request to UE-B;
If received the conversation request on the session control path relevant with this session information, then ICCF gets up these two session associations, and serve as B2BUA, the called number in the above-mentioned SIP conversation request is replaced to UE-B, continue to send conversation request to UE-B;
Send to the above-mentioned conversation request of UE-B and at first send to CSCF.
508) the CSCF above-mentioned conversation request that will receive is transmitted to UE-B;
509) when carry out step 501, on the session control path, UE-A uses USSD to send conversation request to ICCF, comprises session information (number of UE-B, or the number of UE-A and UE-B) (concrete steps that this conversation request is forwarded on the ICCF are omitted) in this conversation request;
After ICCF receives this conversation request, judge whether to receive conversation request on the relevant carrying control path according to the session information that wherein comprises:
If do not receive, the then arrival of the SIP conversation request on the control to be lifted path such as ICCF; If receive, then to use session information that this session control path and the session on the sessions carry path are carried out related for ICCF, and session is controlled session on the path as the session control branch of the session on the carrying control path.
Claims (9)
1. a call method of an IP Multimedia System centralized control business is characterized in that,
Rise and exhale terminal to use session information to exhale terminal to initiate a session request to end in session control path and carrying control path;
VMSC is redirected to ICCF with it after receiving conversation request on the described carrying control path, comprises the steps: that A:VMSC sends initial monitoring point message to ICCF, comprises described session information in this message; B:ICCF preserves described session information after receiving this initial monitoring point message, distributes the interim routing number of IMS of ICCF, and the connection message that will comprise the interim routing number of this IMS is sent to VMSC; C:VMSC uses the interim routing number of described IMS that the conversation request on the described carrying control path is sent to ICCF;
ICCF serves as described and exhales the back-to-back user agent B2BUA of terminal to exhale terminal to make a call to end after receiving conversation request on the described carrying control path; And after the conversation request that receives on the described session control path, use described session information to carry out related with the conversation request on the described carrying control path it;
Described session information comprises exhales termination number eventually.
2. the method for claim 1 is characterized in that,
Step C is divided into following substep:
C1:VMSC sends the ISUP initial address message to MGCF, and the called number of this message is the interim routing number of described IMS;
C2:MGCF sends the SIP conversation request by CSCF to ICCF after receiving the ISUP initial address message, and the called number of this request is the interim routing number of described IMS;
Also comprise following steps after the step C2:
D:ICCF obtains the described session information of preservation after receiving the SIP conversation request of described MGCF transmission according to the interim routing number of described IMS that wherein comprises;
E:ICCF uses exhale the called number of termination number as described SIP conversation request the described end that comprises in the described session information, exhales terminal to make a call to described end.
3. method as claimed in claim 2 is characterized in that, also comprises following steps between step D and the E:
D1:ICCF judges whether to receive the conversation request on the relevant described session control path of described session information, if receive, then use described session information to carry out related with the SIP conversation request that described MGCF sends the conversation request on the described session control path.
4. method as claimed in claim 2 is characterized in that, also comprises following steps after the step e:
After F:ICCF receives conversation request on the described session control path, use the described session information that wherein comprises to carry out its SIP conversation request related with paid-in described MGCF transmission.
5. the method for claim 1 is characterized in that,
In the steps A, VMSC triggers the intelligent dialing trigger, sends described initial monitoring point message by gsmSCF to ICCF by this intelligent dialing trigger;
Among the step B, ICCF is sent to VMSC by gsmSCF with described connection message after receiving this initial monitoring point message.
6. method as claimed in claim 5 is characterized in that, exhales terminal when circuit domain is registered for described, and VMSC downloads described intelligent dialing trigger from HLR.
7. the method for claim 1 is characterized in that, described session information also comprises described number of exhaling terminal.
8. the method for claim 1 is characterized in that, described session control path is I1-cs or I1-ps.
9. the method for claim 1 is characterized in that, exhaling termination number described end is the number of form E.164TEL.
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| CN103546459A (en) * | 2013-09-22 | 2014-01-29 | 中兴通讯股份有限公司 | Method, terminal and server for carrying out session on basis of session initiation protocols |
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