CN101056284B - A method for implementing the pure circuit switching in the next-generation network - Google Patents
A method for implementing the pure circuit switching in the next-generation network Download PDFInfo
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Abstract
The invention discloses a method that realizes pure circuit switching in network of future generation, which is used for the HAIRPIN calling procedure of the pure circuit switching between PSTN users under the control of soft switch SS, including steps: carrying out the structure extension of media descriptor in H.248 protocol; the professional side of soft switch judges a PSTN to PSTN user's calling, notifying the H.248 protocol module that this calling is a HAIRPI calling; during order mutual of H.248 protocol module with a gateway, the gateway judges the HAIRPIN calling according to the media descriptor sign, adds main called side information at media descriptor information bit, and carries out pure circuit switching call spicing. The invention makes the HAIRPIN call in the NGN network inheriting the original various new business of user, which achieves gateway cost reduction effect, saves gateway VoIP resource, and improves the utilization ratio of gateway VoIP resource.
Description
Technical field
The present invention relates to the next generation (NGN) network field, relate in particular to the technology that under soft switch (SS) control gateway is realized pure circuit switching (HAIRPIN) process.
Background technology
Soft switch (SS) development of internet technology is the basis of traditional exchange network evolution with practice; but, be badly in need of to solve a problem: how when taking into account network development, make full use of the legacy network resource for operator; the steady evolution of traditional exchange network is finished in the existing investment of protection.
It is a progressive process that the local switching network of PSTN is introduced soft switch, and its development tactics can adopt the overlay network mode, on broadband packet, sets up the flexible exchanging network that is independent of PSTN.Initial stage attracts the user with new business, promotes the market competitiveness; In at a specified future date, along with switching equipment moves back the lifting that net and professional ability require, PSTN user is progressively moved to flexible exchanging network, local network is progressively to the objective network evolution that with the soft switch is core.
In the NGN network, realized the intercommunication of public switch telephone network (PSTN) net and Packet Based Network.Like this, under SS control, generally, the calling meeting between two PSTN users transmits voice (VoIP) resource to Packet Based Network by the Internet, and then gets back to the PSTN net, arrives called.
And in fact, in this case fully can be without Packet Based Network, and directly finish calling in the PSTN side, existing method has caused the waste of VoIP resource, has increased equipment cost.For this reason, industry has proposed the pure Circuit-switched thought under SS control, is called HAIRPIN and calls out.And present conventional way is directly two physics destination nodes to be joined in the same association, and this way is changed each aspect that relates to the NGN network, implements cumbersomely, and new business realizes also very difficult.Therefore, the VoIP wasting of resources that causes to Packet Based Network by the VoIP resource at the calling between the PSTN user in the existing method, and new business realizes difficult problem, it is simple to the present invention proposes a kind of realization flow, the solution of clear thinking.
Summary of the invention
Technical problem to be solved by this invention is to be to provide a kind of based on the good autgmentability of agreement H.248, and the method for media descriptor handling (X-ZteHairpin) realizes that HAIRPIN calls out by expanding H.248.
In order to solve the problems of the technologies described above, the invention provides a kind of pure Circuit-switched method that in new generation network, realizes.The present invention is used for comprising the steps: at the pure Circuit-switched HAIRPIN calling procedure between the PSTN user under the soft switch SS control
(1) carry out the structural extended of media descriptor handling in agreement H.248, described structure comprises media descriptor handling sign position and information bit;
(2) the soft switch service side of next generation network NGN determines when taking place PSTN to PSTN user's calling, and notifying H.248 this calling of protocol module is the HAIRPIN calling;
(3) described H.248 protocol module with the command interaction of gateway in, by identifying this calling of notification gateway in described media descriptor handling sign position interpolation media descriptor handling is that HAIRPIN calls out, described gateway judges that according to this media descriptor handling sign HAIRPIN calls out, add Calling Side information and callee side information in described media descriptor handling information bit, and carry out pure circuit-switched call in view of the above and continue.
According to above-mentioned pure Circuit-switched method, the described information bit in the described step (1) comprises Calling Side information and callee side information respectively.
According to above-mentioned pure Circuit-switched method, described step (3) further comprises the steps:
(31) PSTN carries out the HAIRPIN calling to PSTN user, and notifying H.248 this calling of protocol module is that HAIRPIN calls out, and then H.248 protocol module is assigned interpolation caller medium order and carried media descriptor handling to gateway;
(32) described gateway is received the interpolation caller medium order that protocol module is H.248 assigned, and carry media descriptor handling, described gateway judges it is that HAIRPIN calls out according to the media descriptor handling sign, then take the caller medium to database, application caller circuit time slot, the application of caller medium successfully and with Calling Side information is inserted information bit, returns the order of caller media answer and gives SS;
(33) after SS receives that gateway adds the success response of caller medium, assign to gateway by protocol module H.248 and to add called medium order, and carry the media descriptor handling that comprises Calling Side information;
(34) after gateway is received and is added called medium order, judge it is that HAIRPIN calls out according to the media descriptor handling sign, then take called medium to database, apply for called circuit time slot, called medium application successfully and with callee side information is inserted information bit, return called media answer order and give SS, then the calling and called medium are continued by Circuit Switching Network, realize main the conversation.
According to above-mentioned pure Circuit-switched method, described Calling Side information is caller circuit gap information.
Further, described Calling Side information also comprises: the data field index information.
According to above-mentioned pure Circuit-switched method, described callee side information is called circuit gap information.
Further, described callee side information also comprises: the data field index information.
Compared with prior art, extended medium descriptor (X-ZteHairpin) has following advantage by introducing H.248 in the present invention:
1.SS the business realizing flow process of side is constant, has guaranteed the basic call of user under HAIRPIN and the inheritance that new business realizes.Common HAIRPIN needs the business side special processing, and new business realizes difficulty.
2. gateway side because the extended description symbol can carry callee side information to caller, also can be given the called Calling Side information of carrying, and gateway realizes that call proceeding is very convenient.Do not need to judge that by destination node topological relation in the context relation of continuing carries out call proceeding.
By adopting the method for the invention, compared with prior art, make that the realization flow that HAIRPIN calls out in the NGN network is simple, clear thinking, in calling out, HAIRPIN also can inherit the various new business of original user, reach reduction gateway cost effectiveness simultaneously, saved gateway VoIP resource, improved the utilance of gateway VoIP resource.
Description of drawings
Fig. 1 is the embodiment schematic flow sheet that the present invention realizes the pure circuit switching method that HAIRPIN calls out;
Fig. 2 is that the present invention realizes the SS of HAIRPIN calling and the Signalling exchange schematic flow sheet between the gateway.
Embodiment
The present invention is directed to the problem of the VoIP wasting of resources that the calling between the PSTN user in the existing method causes to Packet Based Network by the VoIP resource, proposed a solution.Its basic ideas are as follows:
To the SS business side, still adopt the flow process the same with needing the VoIP resource in form, but this VoIP is virtual VoIP resource, on software is realized is to have used the VoIP resource, but gateway is not applied for the VoIP resource on realizing, agreement generates virtual VoIP resource, guarantees that the business side flow process is constant.In calling procedure, if business side will be operated the VoIP resource, then H.248 protocol side is issued gateway side to relevant information by extended medium descriptor (X-ZteHairpin) by agreement H.248 then voip operation being changed into operation to physical entity.Like this, from the SS angle, being in business side physical entity and VoIP to be operated, and it seems from gateway side, all is that physical entity is operated.
The key of the inventive method is the H.248 media descriptor handling (X-ZteHairpin) that has defined a kind of expansion.Under this thinking, the calling/called information that HAIRPIN calls out all is to transmit mutually by this descriptor information, realizes that the called call circuit of caller continues.
Below in conjunction with Fig. 1 the enforcement of technical scheme being described in detail, is that the present invention realizes the pure Circuit-switched method that HAIRPIN calls out as shown in Figure 1 in the NGN network, may further comprise the steps:
101: carry out the structural extended of media descriptor handling in agreement H.248, described structure comprises media descriptor handling sign position and information bit;
It is the calling of PSTN to PSTN user that the SS business side of 102:NGN network is judged, notice H.248 this calling is that HAIRPIN calls out;
103:SS assigns to gateway by module H.248 and adds the order of caller medium, is with media descriptor handling (X-ZteHairpin;
104: gateway judges it is that HAIRPIN calls out according to extended medium descriptor (X-ZteHairpin) sign after receiving and adding the order of caller medium, then take the caller medium to database, application caller circuit time slot, caller medium application success, then Calling Side information is inserted information bit, and return the order of caller media answer and give SS;
After 105:SS receives that gateway adds the success response of caller medium, add called medium order, be with media descriptor handling (X-ZteHairpin), comprise the information bit of Calling Side information by H.248 assigning 3 to gateway;
106: after gateway is received and added called medium order, judge it is that HAIRPIN calls out according to extended medium descriptor (X-ZteHairpin) information, then take called medium to database, application is by called circuit time slot, called medium application success, then callee side information is inserted information bit, and return the order of caller media answer and give SS;
107:SS continues the calling and called medium after receiving that gateway adds called medium success response by Circuit Switching Network, realize main the conversation, finishes HAIRPIN and calls out.
Below in conjunction with Fig. 2 the enforcement of technical scheme being described in further detail, is to realize the SS of HAIRPIN calling and the Signalling exchange flow process between the gateway under this programme as shown in Figure 2.Wherein, the calling of user A and user B is set up by Tandem Gateway TG, and media gateway controller MGC is soft switch SS, and the treatment step of its flow process part is as follows:
At first, H.248 carrying out the media descriptor handling expansion in the agreement, descriptor is designated X-ZteHairpin.
The first step: PSTN user A dials PSTN user B, the soft switch service side find called after, just notifying H.248 protocol module is that HAIRPIN calls out, and H.248 assigns to gateway and adds 201 caller medium orders, is with media descriptor handling (X-ZteHairpin);
Second step: gateway judges it is that HAIRPIN calls out according to extended medium descriptor (X-ZteHairpin) sign position information after receiving and adding 201 caller medium orders, then take the caller medium to database, application caller circuit time slot, caller medium application success, and Calling Side information such as the circuit time slot of caller and data field index are inserted the media descriptor handling information bit take back, and return 202 caller media answer orders and give SS to SS;
After the 3rd step: SS receives that gateway adds the success response of caller medium, add 203 called medium orders, be with media descriptor handling (X-ZteHairpin), comprise the caller time slot, information such as data field index by H.248 assigning to gateway;
The 4th step: after gateway is received and added 203 called medium orders, judge it is that HAIRPIN calls out according to extended medium descriptor (X-ZteHairpin) sign position information, then take called medium to database, apply for called circuit time slot, called medium application success, and callee side information such as called circuit time slot and data field index are inserted the media descriptor handling information bit to be taken back to SS, and return 204 called media answer orders and give SS, then the calling and called medium are continued by Circuit Switching Network, realize main the conversation;
The 5th step: after SS receives that gateway adds called medium success response, finish HAIRPIN and call out.
Claims (6)
1. in next generation network, realize pure Circuit-switched method for one kind, be used for it is characterized in that, comprise the steps: at the pure Circuit-switched HAIRPIN calling procedure between the PSTN user under the soft switch SS control
(1) carry out the structural extended of media descriptor handling in agreement H.248, described structure comprises media descriptor handling sign position and information bit;
(2) the soft switch service side of next generation network NGN determines when taking place PSTN to PSTN user's calling, and notifying H.248 this calling of protocol module is the HAIRPIN calling;
(3) described H.248 protocol module with the command interaction of gateway in, by identifying this calling of notification gateway in described media descriptor handling sign position interpolation media descriptor handling is that HAIRPIN calls out, described gateway judges that according to this media descriptor handling sign HAIRPIN calls out, add Calling Side information and callee side information in described media descriptor handling information bit, and carry out pure circuit-switched call in view of the above and continue.
2. the method for claim 1 is characterized in that, described step (3) specifically realizes by following steps:
(31) PSTN carries out the HAIRPIN calling to PSTN user, and notifying H.248 this calling of protocol module is that HAIRPIN calls out, and then H.248 protocol module is assigned interpolation caller medium order and carried media descriptor handling to gateway;
(32) described gateway is received the interpolation caller medium order that protocol module is H.248 assigned, and carry media descriptor handling, described gateway judges it is that HAIRPIN calls out according to the media descriptor handling sign, then take the caller medium to database, application caller circuit time slot, the application of caller medium successfully and with Calling Side information is inserted information bit, returns the order of caller media answer and gives SS;
(33) after SS receives that gateway adds the success response of caller medium, assign to gateway by protocol module H.248 and to add called medium order, and carry the media descriptor handling that comprises Calling Side information;
(34) after gateway is received and is added called medium order, judge it is that HAIRPIN calls out according to the media descriptor handling sign, then take called medium to database, apply for called circuit time slot, called medium application successfully and with callee side information is inserted information bit, return called media answer order and give SS, then the calling and called medium are continued by Circuit Switching Network, realize main the conversation.
3. method as claimed in claim 2 is characterized in that, described Calling Side information is caller circuit gap information.
4. method as claimed in claim 3 is characterized in that, described Calling Side information further comprises: the data field index information.
5. method as claimed in claim 2 is characterized in that, described callee side information is called circuit gap information.
6. method as claimed in claim 5 is characterized in that, described callee side information further comprises: the data field index information.
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| CN2007101106357A CN101056284B (en) | 2007-06-06 | 2007-06-06 | A method for implementing the pure circuit switching in the next-generation network |
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| CN2007101106357A CN101056284B (en) | 2007-06-06 | 2007-06-06 | A method for implementing the pure circuit switching in the next-generation network |
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| CN101056284B true CN101056284B (en) | 2011-08-24 |
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| CN103634193A (en) * | 2012-08-24 | 2014-03-12 | 中兴通讯股份有限公司 | Pure circuit switching realizing method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852358A (en) * | 2005-07-01 | 2006-10-25 | 华为技术有限公司 | A method for controlling multiple forwarding and dialing of services |
| CN1953447A (en) * | 2005-10-21 | 2007-04-25 | 华为技术有限公司 | A method for processing media resource |
| CN1968515A (en) * | 2006-05-10 | 2007-05-23 | 华为技术有限公司 | Realization method for soft switch equipment managing roaming gateway in NGN network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852358A (en) * | 2005-07-01 | 2006-10-25 | 华为技术有限公司 | A method for controlling multiple forwarding and dialing of services |
| CN1953447A (en) * | 2005-10-21 | 2007-04-25 | 华为技术有限公司 | A method for processing media resource |
| CN1968515A (en) * | 2006-05-10 | 2007-05-23 | 华为技术有限公司 | Realization method for soft switch equipment managing roaming gateway in NGN network |
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