CN101212387B - Method for interworking between circuit switching network and IP multimedia subsystem - Google Patents
Method for interworking between circuit switching network and IP multimedia subsystem Download PDFInfo
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- CN101212387B CN101212387B CN2006101722621A CN200610172262A CN101212387B CN 101212387 B CN101212387 B CN 101212387B CN 2006101722621 A CN2006101722621 A CN 2006101722621A CN 200610172262 A CN200610172262 A CN 200610172262A CN 101212387 B CN101212387 B CN 101212387B
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Abstract
The invention relates to a method for intercommunicating a circuit switching network and an IP multimedia subsystem, which includes the following steps: for a call sent to an IMS network by the circuit switching network, MGCF extracts domain name information of the IMS network included in a called number and searches for system configuration information according to the domain name information; the MGCF also applies for corresponding resource to a media gateway, sends a request on establishing the call to the CSCF and sends a response on establishing the call to the circuit switching network; for the call sent to the circuit switching network by the IMS network, the MGCF extracts the domain name information of the IMS network included in the called number and searches for the system configuration information according to the domain name information; if no corresponding system configuration information exists or the system configuration information is not consistent with an IP address or a port corresponding to the call request, wrong information returns; the MGCF also applies for the corresponding resource to the media gateway, sends the request on establishing the call to the circuit switching network and sends the response on establishing the call to the IMS network.
Description
Technical field
The present invention relates to IP (Internet Protocol, Internet Protocol) multimedia field, relate in particular to the interoperability methods of a kind of circuit-switched network and IP Multimedia System.
Background technology
Along with telecommunication technology and professional development, the competition of telecommunication market is more and more fierce.Current, the mobile operator of field of telecommunications and fixed operator are developed many new business just energetically in order to contend for markets, and attract and keep the client here, to obtain more revenue.Meanwhile, increasing user also wishes to obtain comprehensive and one-stop service.Therefore, the fusion of fixed communication network and mobile radio communication (FMC) just becomes one of future development trend of the communications industry.Network integration scheme based on IP Multimedia System (IMS, IP Multi-media Subsystem) has been described a fine network development prospect, therefore has been subjected to the extensive concern of industry.
Network will develop into the all-IP net needs a process, so the enforcement of IMS need be carried out step by step.At the initial stage that IMS implements, the communication network of traditional circuit exchange mode still can exist, so IMS need carry out intercommunication with the legacy circuit-switched networks network, make keep existing user here and carry out new business, the new user of development carries out simultaneously.Complete IMS structure can be divided into three logic regions: visit territory (VisitNetwork), gateway territory (Gateway Network) and home domain (Home Network).
The visit territory comprises SIP (Session Initiation Protocol, Session initiation Protocol) client and P-CSCF (Proxy Call Session Control Function, Proxy Call Session Control Function), P-CSCF essence is a sip agent, its effect is to accept the registration of all SIP clients and calling, according to caller/called SIP URI (Unified Resource Identifier, the unified resource sign) removes to locate its corresponding home domain, to finish registration process and call proceeding.The form of SIP URI is SIP:user@domain.A plurality of P-CSCF can coexist to realize load balancing, in planning network, can dispose (comprising local user and roamer) quantity of P-CSCF according to active user number in this zone.
The function in gateway territory is finished IMS and circuit-switched communications net exactly, comprise PSTN (PublicSwitched Telephone Network, public switch telephone network), ISDN (Integrated ServiceDigital Network, integrated services digital network), the intercommunication of PLMN (Public Land Mobile Network, public-land mobile network) etc.The gateway territory comprises media control function (MGCF), media gateway (IMS-MGW) and SGW (SGW).The function of MGCF for the connection of the media channel of control among the IMS-MGW, communicate by letter with CSCF (comprising S-CSCF and B-CSCF), according to routing number, for the incoming call of sending from the legacy circuit-switched networks network is selected CSCF (S-CSCF), is carried out the conversion between ISUP (Integrated Services Digital Network User Part, ISUP) agreement and IMS call control protocol.IMS-MGW can set up and stop from the Bearer Channel of Circuit Switching Network with from the Media Stream of Packet Based Network, can the support media conversion, carrying control and load handle.SGW (SGW) is mainly finished the SIP signaling of IMS and the signaling translation function between the Circuit-switched No.7 signaling (signalling system No.7).
Home domain and geographic area be relation not directly, but and the domain (territory) among the SIP URI (SIP:user@domain) corresponding relation is arranged.In general, each domain should have the home domain of oneself, but for the few domain of number of users, several in fact domain can share a cover home domain equipment, this means that also operator can give the enterprise customer with the home domain equipment leasing, so the enterprise customer does not need to purchase relatively costly home domain equipment.
As from the foregoing, MGCF is the functional entity that IMS network and legacy circuit-switched networks network are realized intercommunication.As shown in Figure 1, in order to realize the intercommunication of legacy circuit-switched networks network and IP multi-media network, the method of common employing is, adopt a MGCF to finish media gateway/SGW (MGW/SGW) registration, call out functions such as control and MGW/SGW resource management, finally reach the purpose of network interworking.
But the method for this legacy circuit-switched networks network of the prior art and IMS network interworking has following shortcoming:
One, cause the wasting of resources: owing to different phase in network development, the customer volume difference is also different to the requirement of gateway.Usually at the commercial initial stage of IMS, customer volume is little, comes relative higher with local voice switching network intercommunication cost to each IMS network with a MGCF.
Two, be unfavorable for the access of local voice switching network operator management different IMS Virtual network operator.IMS Virtual network operator and local voice switching network operator not simultaneously, the configuration management more complicated that local voice switching network operator carries out a plurality of MGCF.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiency of legacy circuit-switched networks network and IMS network intercommunication method in the prior art, proposes a kind of method that a MGCF realizes a plurality of IMS networks and circuit-switched network intercommunication of passing through.
In order to address the above problem, the invention provides the interoperability methods of a kind of circuit-switched network (IMS) and IP Multimedia System, for the calling that circuit-switched network is initiated to the IMS network, this method is carried out following steps:
Steps A: MGCF extracts the domain-name information of the IMS network that comprises in the called number, according to the dns query message system configuration information, obtains the IP address and the port information of CSCF correspondence in the described IMS network;
Step B:MGCF is to media gateway application respective resources;
Step C:MGCF uses the IP address of the CSCF correspondence in the described IMS network and port information to send to described CSCF and sets up call request, sets up to comprise the resource information of being applied in the call request;
Step D:MGCF sends the call setup response to described circuit-switched network, and finishes the follow-up handshaking procedure of calling.
In addition, when MGCF received the call release request that the side in circuit-switched network and the IMS network sends, MGCF sent call release request to the opposing party, and carried out following steps:
Step a:MGCF sends the release resource request to media gateway;
Step b:MGCF receives the release resource response that media gateway is sent, call release.
In addition, this method also comprises following steps:
When sending 180,183 message to CSCF transmission INVITE request message or to BGCF, MGCF is according to the ICID value in its machine name generation P-Charging-Vector header in the IMS of correspondence network; And generate orig-ioi value in the P-Charging-Vector header according to its machine name in the IMS of correspondence network and domain name.
In addition, described system configuration information can obtain by static mode.
In addition, described system configuration information can dynamically be obtained according to the office's numbering and the type information that comprise in caller or the called number.
The present invention passes through in MGCF according to the different corresponding domain informations of IMS network configuration, from the system configuration information storehouse, get access to the domain information of MGCF in corresponding IMS network in this session according to the IMS domain names information of going into or going out, realized realizing the intercommunication of a plurality of IMS networks and circuit-switched network by a MGCF, make operator's networking neatly, saved carrier network and disposed and management costs.
Description of drawings
Fig. 1 is the schematic network structure of IMS network and circuit-switched network (traditional local network) intercommunication in the prior art;
Fig. 2 adopts a plurality of IMS networks of interoperability methods of circuit-switched network of the present invention and IP Multimedia System and the schematic network structure of circuit-switched network (traditional local network) intercommunication;
Fig. 3 is the call setup and release flow chart that the circuit-switched network (traditional local network) of the interoperability methods of employing circuit-switched network of the present invention and IP Multimedia System is initiated to the IMS network;
Fig. 4 is the call setup and release flow chart that the IMS network of the interoperability methods of employing circuit-switched network of the present invention and IP Multimedia System is initiated to circuit-switched network (traditional local network);
Embodiment
Basic ideas of the present invention are, by in MGCF, disposing, dynamically obtain and preserve the domain-name information and the routing iinformation of coupled IMS network, and when initiating call request to the IMS network in Circuit Switching Network, determine purpose IMS network according to the domain-name information that comprises in the call request, realized intercommunication with a plurality of IMS networks.
Support that below in conjunction with accompanying drawing and with a MGCF intercommunication of two IMS networks and circuit-switched network is an example, describe the present invention.
Fig. 2 is the schematic network structure of a plurality of IMS networks and circuit-switched network intercommunication.As shown in Figure 2, MGCF links to each other with the CSCF network element with BGCF in 2 IMS networks, communicates with user's face of circuit-switched network by media gateway (IMS-MGW), communicates with the signaling plane of circuit-switched network by SGW (SGW).By Fig. 1 and Fig. 2 more as can be seen, the present invention can save N-1 (N represents the number with the IMS network of circuit-switched network intercommunication) cover MGCF/MGW/SGW equipment.
Call setup and release flow chart that Fig. 3 is to use the circuit-switched network of the interoperability methods of circuit-switched network of the present invention and IP Multimedia System to initiate to the IMS network.As shown in Figure 3, Circuit Switching Network's (traditional local network) comprises following steps to the call establishment and the release of the initiation of IMS network:
Step 301:MGCF receives the set up call request of Circuit Switching Network to the initiation of IMS1 network;
Receive set up call request after, MGCF analyzes the called number that comprises in the call request, extracts the domain-name information information of @ ' character back (be in the number ') of the IMS network that comprises in the called number; MGCF is according to the dns query message system configuration information, obtains the information such as IP address, port of CSCF in the IMS1 network;
Step 302:MGCF communicates with user's face of circuit-switched network to media gateway IMS-MGW application resource, applies for resource and IMS1 network interworking simultaneously;
Step 303:MGCF receives the application resource response that media gateway IMS-MGW sends;
The IP address of the CSCF of step 304:MGCF in the IMS1 network and port send sets up call request, sets up to comprise the resource information of being applied in the call request;
Step 305:MGCF receives the call setup response message of IMS1 network, and that calls out continues;
Step 306:MGCF sends the call setup response to circuit-switched network; Finish the follow-up handshaking procedure of calling; If continue successfully, then begin to converse;
Step 307:MGCF receives the call release request that telephone-switching network sends, end of conversation;
Above-mentioned call release request also can be that the IMS1 network sends;
Step 308:MGCF sends call release request to the IMS1 network;
Step 309:MGCF sends the release resource request that discharges user's face resource to media gateway IMS-MGW;
Step 310:MGCF receives the release resource response that media gateway IMS-MGW sends, call release.
In addition, when MGCF sends INVITE (invitation) request message to CSCF or sends 180,183 message to BGCF, need fill in P-Charging-Vector header (P-Charging-Vector head) information according to the requirement of Session Initiation Protocol.
Comprise in the P-Charging-Vector header information: ICID (IMS Charging Identity, IMS fills identifier) value, produce the address information and the IOI (Inter OperatorIdentifiers, identifier between the operator) of the sip agent of above-mentioned ICID value.Comprise orig-ioi (starting point IOI) and term-ioi (terminal point IOI) among the IOI again.
Wherein, for the calling that Circuit Switching Network initiates to the IMS network, MGCF needs to generate the ICID value according to its information such as machine name in the IMS of correspondence network; And according to its machine name and domain name generation orig-ioi value in the IMS of correspondence network.
Call setup and release flow chart that Fig. 4 is to use the IMS network of the interoperability methods of circuit-switched network of the present invention and IP Multimedia System to initiate to circuit-switched network.As shown in Figure 4, the IMS network comprises following steps to the call establishment and the release of circuit-switched network initiation:
The BGCF of step 401:IMS2 network analyzes call request, and judgement need be sent to circuit-switched network with call request, then sends to MGCF and sets up call request;
For fear of illegal network insertion, MGCF is according to the dns query message system configuration information in the calling number that comprises in the call request; If there is not corresponding system configuration information, or system configuration information IP address and the port corresponding with call request is inconsistent; Then return error message, this method finishes;
Step 402:MGCF is to media gateway IMS-MGW application resource and IMS2 network and circuit-switched network intercommunication;
Step 403:MGCF receives the application resource response of media gateway IMS-MGW;
Step 404:MGCF sends to circuit-switched network and sets up call request;
Step 405:MGCF receives the call of setting up of circuit-switched network;
Step 406:MGCF sends to the IMS2 network and sets up call;
Step 407: when MGCF receives the call release request that circuit-switched network sends, finish conversation, charge, and the output Original CDR;
Above-mentioned call release request also can be that the IMS2 network sends;
Step 408:MGCF sends call release request to the BGCF of IMS2 network;
Step 409:MGCF sends the release resource request to IMS-MGW, and the notice media gateway discharges user's face resource;
Step 410:MGCF receives the release resource response that media gateway IMS-MGW sends, call release.
In addition, when MGCF sends 180,183 message to BGCF, need to fill in P-Charging-Vector header information according to the requirement of Session Initiation Protocol.
Wherein, for the calling that the IMS network is initiated to Circuit Switching Network, MGCF needs to generate the term-ioi value according to its machine name and domain name in the IMS of correspondence network.
The system configuration information of above-mentioned MGCF comprises the information such as IP address, port and domain name of CSCF in the coupled IMS network.This system configuration information can obtain by the mode of backstage with order line configuration or other static configuration.
In addition, the said system configuration information also can obtain by dynamical fashion.For example, for the calling of Circuit Switching Network to the initiation of IMS network, MGCF according to number analysis as can be known this calling initiate to which office direction, after obtaining the numbering and type of this office direction, if office's type is BGCF or CSCF, then obtain configuration informations such as corresponding domain name, IP address, port according to this numbering.
Claims (5)
1. the interoperability methods of circuit-switched network and IP Multimedia System (IMS), for the calling that circuit-switched network is initiated to the IMS network, this method is carried out following steps:
Steps A: MGCF extracts the domain-name information of the IMS network that comprises in the called number, according to the dns query message system configuration information, obtains the IP address and the port information of CSCF correspondence in the described IMS network;
Step B:MGCF is to media gateway application respective resources;
Step C:MGCF uses the IP address of the CSCF correspondence in the described IMS network and port information to send to described CSCF and sets up call request, sets up to comprise the resource information of being applied in the call request;
Step D:MGCF sends the call setup response to described circuit-switched network, and finishes the follow-up handshaking procedure of calling.
2. the interoperability methods of circuit-switched network as claimed in claim 1 and IP Multimedia System, it is characterized in that, when MGCF received the call release request that the side in circuit-switched network and the IMS network sends, MGCF sent call release request to the opposing party, and carried out following steps:
Step a:MGCF sends the release resource request to media gateway;
Step b:MGCF receives the release resource response that media gateway is sent, call release.
3. the interoperability methods of circuit-switched network as claimed in claim 1 and IP Multimedia System is characterized in that, this method also comprises following steps:
When sending 180,183 message to CSCF transmission INVITE request message or to BGCF, MGCF is according to the ICID value in its machine name generation P-Charging-Vector header in the IMS of correspondence network; And generate orig-ioi value in the P-Charging-Vector header according to its machine name in the IMS of correspondence network and domain name.
4. the interoperability methods of circuit-switched network as claimed in claim 1 and IP Multimedia System is characterized in that described system configuration information obtains by static mode.
5. the interoperability methods of circuit-switched network as claimed in claim 1 and IP Multimedia System is characterized in that, described system configuration information is dynamically obtained according to the office's numbering and the type information that comprise in caller or the called number.
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| CN2006101722621A CN101212387B (en) | 2006-12-30 | 2006-12-30 | Method for interworking between circuit switching network and IP multimedia subsystem |
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| CN2006101722621A CN101212387B (en) | 2006-12-30 | 2006-12-30 | Method for interworking between circuit switching network and IP multimedia subsystem |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101521615B (en) * | 2009-03-31 | 2013-03-13 | 深圳创维数字技术股份有限公司 | Communication method for different networks and internetwork for smart machine |
| CN101695073B (en) * | 2009-09-30 | 2013-01-09 | 华为技术有限公司 | Method and equipment for processing IMS network call |
| JP6074781B2 (en) * | 2012-12-26 | 2017-02-08 | ▲ホア▼▲ウェイ▼技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Method and apparatus for preventing unauthorized service access |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20050076921A (en) * | 2004-01-26 | 2005-07-29 | 삼성전자주식회사 | Method for providing quality of service by interworking ip multimedia subsystem network and circuit switch network in a mobile communication system |
| CN1838649A (en) * | 2005-03-25 | 2006-09-27 | 华为技术有限公司 | Building method for calling route from circuit switching network to IMS network |
| WO2006099813A1 (en) * | 2005-03-25 | 2006-09-28 | Huawei Technologies Co., Ltd. | A method , system and number transform entity for establishing a call route from circuit switched network to ims network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20050076921A (en) * | 2004-01-26 | 2005-07-29 | 삼성전자주식회사 | Method for providing quality of service by interworking ip multimedia subsystem network and circuit switch network in a mobile communication system |
| CN1838649A (en) * | 2005-03-25 | 2006-09-27 | 华为技术有限公司 | Building method for calling route from circuit switching network to IMS network |
| WO2006099813A1 (en) * | 2005-03-25 | 2006-09-28 | Huawei Technologies Co., Ltd. | A method , system and number transform entity for establishing a call route from circuit switched network to ims network |
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