CN1874346A

CN1874346A - Intercommunication method between users' sides in SIP multimedia system

Info

Publication number: CN1874346A
Application number: CN 200510112064
Authority: CN
Inventors: 李辉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-12-27
Filing date: 2005-12-27
Publication date: 2006-12-06
Anticipated expiration: 2025-12-27
Also published as: CN100496049C

Abstract

The invention is provided for reducing time delay of interactive session between IP terminals with different IP version. In case of signaling layer intercommunication supported by IP network, the network at calling party doesn't make an IP address version conversion for the call connection, and meanwhile the proxy server at the called party makes the IP version estimation for the IP address of called party. Only in case of having different IP version, the ALG can make address conversion through TrGW to implement the intercommunication at subscriber layer.

Description

User's face interoperability methods in the SIP multimedia system

Technical field

The present invention relates to the SIP multimedia system, the interoperability methods of the terminal of particularly multiple different IP version on the SIP multimedia system.

Background technology

Session initiation Protocol (Session Initation Protocol is called for short " SIP ") is the standard of internet engineering task group (IETF) in a kind of VoIP of in March, 1999 issue.SIP has the unique user's addressing and the function of location with the important application of phone as internet (Internet).Recently the practical function of SIP head and shoulders above the application of VoIP.SIP is the agreement of telephone signaling, be used for initiation session, the foundation and the termination of the Multimedia session of can a plurality of participants of control participating in, and can dynamically adjust and revise session attribute: as the code/decode format of session bandwidth requirement, transmission medium type (voice, video, data etc.), medium, to support of multicast and clean culture or the like.Therefore, SIP helps combining with the internet value-added service of the multiple application of exploitation.

Session Initiation Protocol is being widely used in the foundation of Multimedia session.For example internet protocol multimedia subsystem (IP Multimedia Subsystem, be called for short " IMS "), next generation network (Next GenerationNetwork is called for short " NGN "), SIP network etc.

IMS is third generation partner program (3rd Generation Partnership Project, abbreviation " 3GPP ") system in the WCDMA network of R5/R6 standard definition, be that the 3G mobile network is realized packet voice and grouped data, the unified multimedia service and the objective network of application are provided.

IMS is by CSCF (Call Session Control Function, abbreviation " CSCF "), MGCF (Media Gateway Control Function, abbreviation " MGCF "), media resource function (Multimedia Resource Function, be called for short " MRF ") and home signature user server functional entity compositions such as (Home Subscriber Server are called for short " HSS ").CSCF can be divided into serving CSCF (Serving CSCF is called for short " S-CSCF "), proxy CSCF (ProxyCSCF is called for short " P-CSCF ") and three logic entities of inquiry CSCF (Interrogating CSCF is called for short " I-CSCF ") again.Wherein, S-CSCF is the service switching center of IMS, carries out session control, peace preservation association's speech phase, is in charge of user profile, produces charge information etc.; P-CSCF is the access point of terminal user access to IMS, finishes user's registration, is responsible for QoS control and safety management etc.; I-CSCF is responsible for the intercommunication between the IMS territory, the distribution of management S-CSCF, externally hides network topology and configuration, generation metering data etc.The MGCF control gateway realizes the intercommunication of IMS network and other network, and MRF provides media resource, as folding and unfolding sound, encoding and decoding and multimedia conferencing bridge.HSS is a customer data base, storage IMS user's subscription data and configuration information etc.

In order to realize that the three that service management, session control and carrying insert separates, IMS adopts the bearer path of IP packet domain as its control signaling and media delivery, adopt conversation initialized protocol (SessionInitation Protocol is called for short " SIP ") as call control signalling.Session Initiation Protocol is the IP phone signaling protocol that is proposed by the Internet engineering duty group (Internet Engineering Task Force is called for short " IETF ").As what its name implied, SIP is used for initiation session, it can control the foundation and the termination of the Multimedia session of a plurality of participants' participation, and can dynamically adjust and revise session attribute, as session bandwidth require, the code/decode format of the medium type (voice, video and text etc.) of transmission, medium, to the support of multicast and clean culture etc.

3GPP is when formulating the IMS related specifications, consider the 4th edition (InternetProtocol version 4 of internetworking agreement, be called for short " IPv4 ") exist address space to be about to exhaust, problems such as routing table explosion, and the extensive use of IMS requires a large amount of available IP addresses, in realizing the next generation network that multiple medium type merges to the safety of network, quality and mobility are all had higher requirement, therefore, for the mobile network feature entity, the all functions entity of IMS, comprise subscriber equipment (UserEquipment, be called for short " UE "), CSCF, MGCF, MRF and application server (ApplicationServer, be called for short " AS ") all must support the 6th edition (Internet Protocol version6 of internetworking agreement, be called for short " IPv6 "), gateway GPRS supporting node (GGSN) (GPRS Gateway SupportNode, be called for short " GGSN ") with IMS interface is arranged, also must support IPv6, for supporting dynamic address resolution, GGSN also need support the DHCP (Dynamic Host ConfigurationProtocol is called for short " DHCP ") of IPv6.But along with the variation in market and the development of technology, the commercialization of IPv6 scale does not reach the speed of original expectation, lacking all supports based on the IPv6 product simultaneously will make the IMS based on IPv6 use and can not popularize, mobile operator is for by providing abundanter multimedia service to 3G subscription, promote the commercial as early as possible of IMS, attract more user, promote the development of 3G network, advise to 3GPP, consider in the realization of IMS, to support that IPv4 satisfies early stage commercial demand.Therefore, in the standard of 3GPP R5, the IMS network side adopts the IPv6 version, and in the standard of 3GPP R6, the IMS network side adopts the IPv4 version.So in a period of time of IPv4 and IPv6 coexistence, the actual networking of IMS need consider to support the intercommunication of IPv4 to IPv6.

The interworking technology of IPv6 and IPv4 is being mature on the whole at present, and main type has three kinds: the double-stack technology in the network equipment and the terminal, the tunneling technique in the network and message translation technology.Wherein two stacks and tunnel are main means, when only not having identical IP protocol version between equipment, just can use message translation.Therefore, at the IMS network design initial stage, the IMS network entity is generally all supported the two stacks of IP.

At present, the intercommunication scheme during the UE initiation session in the IMS network as shown in Figure 1.Because each IMS network entity and UE (A) side is identical in the network of UE (B) side, therefore omission in the drawings.

Among Fig. 1, IMS application level gateway (IMS Application Level Gateway is called for short " IMS-ALG ") refers to the ALG functional entity in the IMS network, and TrGW refers to transfer gateway (Translation Gateway is called for short " TrGW ").When the S-CSCF of UE (A) side receives the calling that session initiator UE (A) sends, earlier by DNS (DOMAINNAME SYSTEM, be called for short " DNS ") IP version of judging UE (A) support whether with the purpose network, the IP version unanimity of UE (B) side network just, if it is inconsistent, then by and IMS-ALG and TrGW mutual, replace the relevant information of IP version that UE (A) supports in the sip message, use the IP version and the UE (B) of UE (B) side network to continue the session negotiation process then, set up the media delivery path.If the IP version of UE (B) side network and the IP version of UE (B) are inconsistent, so, the S-CSCF of UE (B) side still need by and IMS-ALG and TrGW mutual, use the IP version of UE (B) and UE (B) to continue the session negotiation process, set up the media delivery path.

Above-described ins and outs can be referring to document 3GPP TS23.228 " IP MultimediaSubsystem " (Chinese name can be translated into: " IP Multimedia System ") and 3GPP TR23.981 " Interworking aspects and migration scenarios for IPv4 based " (Chinese name can be translated into " based on intercommunication and the migration summary of Ipv4 ").

In actual applications, there is following problem in such scheme: in the signaling handshaking procedure of calling and called, may need to carry out address transition repeatedly, thereby reduce service quality, and prolong the time delay of user's face intercommunication.

Cause the main cause of this situation to be,, just need carry out the IP version conversion if the IP type between the IMS network entity changes.Therefore, no matter the terminal of calling and called is owing to different Access Networks is introduced the different IP release type, also is to use same IP version type, all may insert IMS-ALG and TrGW at the home network of calling and called side and carry out the IP address transition.Such as the IP version type that the terminal of calling and called is used all is IPv4, and the IP version type of Calling Side network is IPv4, and the IP version type of callee side network is IPv6.After the S-CSCF of Calling Side network receives the calling that the calling subscriber sends, because the IP version type of callee side network is IPv6, therefore need by and IMS-ALG and TrGW mutual, be the version of IPv6 with the version conversion of IPv4, send to the S-CSCF of callee side network again.Because the IP version type of terminal called is IPv4, so, the S-CSCF of callee side network still need by and IMS-ALG and TrGW mutual, the version of IPv6 is converted to the version of IPv4 once more, realize the intercommunication of user's face then.Because the IP version intercommunication between the IMS network entity has particularity, if the IP version type between the IMS network entity changes, just need carry out the IP version conversion of Media Stream, thereby increased the propagation delay time of medium, therefore, address transition repeatedly can reduce service quality, and prolongs the time delay of user's face intercommunication.

Summary of the invention

In view of this, main purpose of the present invention is to provide user's face interoperability methods in a kind of SIP multimedia system, makes terminal session time delay when the IP network intercommunication of different IP version reduce.

For achieving the above object, the invention provides user's face interoperability methods in a kind of SIP multimedia system, comprise following steps:

The A calling terminal makes a call, and the Calling Side network to the callee side network, keeps this to call out original IP address version this call proceeding in the handshaking procedure;

The network equipment in the B callee side network judges according to the IP address of calling and called terminal whether the IP address version is identical, if then the calling and called terminal directly realizes the intercommunication of user's face, otherwise enters step C;

The described network equipment of C to application level gateway, carries out caller and called users face IP address version type conversion by this application level gateway control transformation gateway with call proceeding, realizes the intercommunication of caller and called users face.

Wherein, described steps A comprises following substep,

Described calling terminal makes a call, and carries the IP address of this calling terminal in call request message;

Through Calling Side network of network equipment, described call request message is routed to described callee side network, keep the original IP version of this call request message in the handshaking procedure.

In this external described method, described step B comprises following substep,

The network equipment in the described callee side network is after receiving described call request message, described calling terminal IP address of carrying according to this call request message and described terminal called are in the IP address of home domain registration, whether the IP version of relatively judging the calling and called terminal is identical

If the IP version of calling and called terminal is identical, the then described network equipment to terminal called, is set up user's face intercommunication that link is realized calling and called according to the described call request message of normal process method route;

If the IP version difference of calling and called terminal then enters described step C.

In this external described method, described step C comprises following substep,

When the IP version of described calling and called terminal not simultaneously, described callee side network of network equipment is routed to described application level gateway with described call request message, by its forwarded call request message;

Described application level gateway is controlled described transfer gateway and is carried out caller and called users face address transition, and the address information after will changing adds described call request message, then the forwarded call request message;

After signaling continues and finishes, carry out address transition by described transfer gateway between the described calling and called terminal, realize the intercommunication of user's face.

In this external described method, among the described step B, described callee side network of network equipment is known its IP version information by resolving described terminal called domain name, and carries out the contrast judgement of IP version in view of the above.

In this external described method, among the described step C, when described calling and called terminal is carried out the intercommunication of user's face, described transfer gateway receives the user data of described calling terminal and be transmitted to described terminal called behind conversion IP address, receives the user data of described terminal called simultaneously and be transmitted to described calling terminal behind conversion IP address.

In this external described method, described call request message is the conversation request message of Session Initiation Protocol;

The address information of described calling terminal is carried by following any one territory of described conversation request message:

" Contact " territory or " via " territory.

In this external described method, among the described step C:

Described callee side network of network equipment is forwarded to described application level gateway by insert described application level gateway address in " Route " territory of described conversation request message with described conversation request message;

Described application level gateway is revised after the medium flow IP address in Session Description Protocol territory in the described conversation request message, transmits request message again.

In this external described method, described SIP multimedia system is one of following:

Internet protocol multimedia subsystem or next generation network.

In this external described method, the described network equipment is one of following:

Sip proxy server, application server, service call conversation control function and Proxy Call Session Control Function.

By relatively finding, the main distinction of technical scheme of the present invention and prior art is, support under the signaling plane intercommunication situation in IP network, the Calling Side network is not done IP address version type conversion to the call proceeding of terminal, acting server at the callee side network carries out the IP version judgement according to the IP address of calling and called terminal, only not simultaneously, just carry out address transition by TrGW, realize the intercommunication of user's face by ALG at IP version.

Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly because only carry out the conversion of IP address class type at the callee side network, so reduced the access times of the address transition face of ALG/TrGW, shortened the user's face intercommunication time delay between the different IP version terminal as much as possible, improve communication efficiency, improved user experience, promoted the development of IP operation of future generation.

Description of drawings

Fig. 1 is according to the intercommunication schematic flow sheet during the UE initiation session in the IMS network of prior art;

Fig. 2 be according to of the present invention in the IMS calling and called terminal IP version type system construction drawing of user's face intercommunication simultaneously not;

Fig. 3 is the principle flow chart according to user's face intercommunication in the IP network of the present invention;

Fig. 4 is the callee side process chart of user's face intercommunication among the IMS of one better embodiment according to the present invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Be that example illustrates principle of the present invention below with IMS, be appreciated that method of the present invention also is applicable to other SIP multimedia system, in NGN.In IMS, after calling terminal was making a call, the S-CSCF of Calling Side network and P-CSCF kept this to call out original IP version in the handshaking procedure of this calling, up to this call proceeding to the callee side network.The S-CSCF of callee side network judges at first whether the IP address of calling and called terminal is identical after receiving this call request message, if identical, then directly realize user's face intercommunication of calling and called terminal; If different, then S-CSCF to IMS-ALG, carries out this call proceeding the conversion of caller and called users face IP address version type by this IMS-ALG by control TrGW, and by P-CSCF this calling is sent to terminal called, finishes continuing of signaling.Signaling continue finish after, still need between the calling and called terminal to carry out address transition by TrGW, realize the intercommunication of user's face.Therefore, when the IP version type of calling and called terminal is consistent, need not to carry out address transition at all, when the IP version Type-Inconsistencies of calling and called terminal, in the handshaking procedure of call signaling, also only need carry out primary address conversion (its system configuration as shown in Figure 2), thereby the session time delay when having shortened user's face intercommunication among the IMS has improved service quality, has improved user experience.

As shown in Figure 3, in step 310, calling terminal makes a call.Specifically, calling terminal makes a call by sending call request message, and carries the IP address of this calling terminal in this call request message.Wherein, call request message is the conversation request message of Session Initiation Protocol, and therefore, the address information of this calling terminal can be carried by any one territory in " Contact " territory, " address " territory or " via " territory of conversation request message.

Then, enter step 320, the Calling Side network keeps this to call out original IP version in the handshaking procedure of this calling.Specifically, after the P-CSCF in the Calling Side network received the calling that this calling terminal initiates, the IP version to this call request message in processing procedure was not changed, and with the S-CSCF of this call proceeding in the Calling Side network.After the S-CSCF in the Calling Side network receives this calling, in processing procedure, equally the IP version of this call request message is not changed, and with the S-CSCF of this call proceeding in the callee side network.

Then, enter step 330, the S-CSCF in the callee side network judges whether the IP version type of calling and called terminal is consistent.Specifically, S-CSCF in the callee side network is after receiving the call request message that carries this calling terminal IP address, in the IP address of home domain registration, judge whether the IP version of calling and called terminal is identical according to the entrained IP address that this calling terminal arranged and terminal called.Perhaps, by resolving the domain name of this terminal called, thereby know its IP version information, and carry out the judgement of the IP version type of calling and called terminal in view of the above.If the IP version of calling and called terminal is inequality, then enter step 340; If the IP version of calling and called terminal is identical, then enter step 360, directly realize the intercommunication of user's face.

In step 340, IMS-ALG sends to terminal called by the P-CSCF in the callee side network with call request message after IP version is changed.Specifically, after the S-CSCF in the callee side network judges the IP version Type-Inconsistencies of calling and called terminal, with the IMS-ALG of this call proceeding in the callee side network.Such as, before the P-CSCF address of S-CSCF by the callee side network in call request message " Route " territory, insert this IMS-ALG address, thereby this call request message is forwarded to IMS-ALG.IMS-ALG is after receiving this call request message, TrGW carries out the conversion of the IP address version type of caller and called users face by control, and the address information after will changing adds this call request message, simultaneously, with (the Session Description Protocol of Session Description Protocol in this call request message, abbreviation " SDP ") medium flow IP address is revised as the medium flow IP address after the conversion, is transmitted to the P-CSCF of callee side network then.At last, will send to terminal called from the call request message that this IMS-ALG receives, finish continuing of signaling, set up the calling and called link of terminal by this P-CSCF.Then, enter step 350.

In the step 350, the calling and called terminal realizes the intercommunication of user's face by TrGW.Specifically, signaling continue finish after, when the calling and called terminal is carried out the intercommunication of user's face, TrGW is after receiving the user data of calling terminal, need behind conversion IP address, to be transmitted to terminal called, simultaneously, after receiving the user data of terminal called, need behind conversion IP address, to be transmitted to calling terminal, thereby realize the intercommunication of user's face.

If in step 330, the S-CSCF in the callee side network judges the IP version type unanimity of calling and called terminal, then enters step 360, directly realizes the intercommunication of user's face.That is to say that if the IP version of calling and called terminal is identical, then the S-CSCF in the callee side network directly is routed to this call request message the P-CSCF of callee side network, set up user's face intercommunication that link is realized calling and called.

According to principle of the present invention, user's face interoperability methods among the better embodiment IMS of the present invention is described below.In the present embodiment, the IP version type of calling terminal is IPv6, and the IP version type of terminal called is IPv4.

Calling terminal sends the conversation request message of Session Initiation Protocol as call request message, makes a call, and the IP address that this calling terminal is carried in any one territory in " Contact " territory, " address " territory or " via " territory of conversation request message.S-CSCF in the Calling Side network and P-CSCF keep this to call out original IP version, just IPv6 in the handshaking procedure of this calling.

The handling process of callee side as shown in Figure 4.

In step 401, after S-CSCF in the callee side network receives the call request message of Calling Side network transmission, according to the IP address of this calling terminal that carries in this message and terminal called IP address in the home domain registration, the IP version that can know calling terminal is IPv6, and the IP version of terminal called is IPv4.Perhaps, S-CSCF also can pass through to resolve the domain name of this terminal called, thereby the IP version of knowing this terminal called is IPv4.

Because the S-CSCF in the callee side network is inconsistent through the IP version that judgement draws the calling and called terminal, therefore, in step 402, S-CSCF is with the IMS-ALG of this call proceeding in the callee side network.That is to say, before the P-CSCF address of the callee side network of S-CSCF in call request message " Route " territory, insert the IMS-ALG address, thereby this call request message is forwarded to IMS-ALG.

Then, enter step 403, the TrGW of the IMS-ALG in the callee side network in this network sends the address transition request.

Then, enter step 404, TrGW responds this address transition request to IMS-ALG.

In step 403 and step 404, IMS-ALG carries out the conversion of the IP address version type of caller and called users face by control TrGW, just the release type of IPv6 is converted to the release type of IPv4, and the address information after will changing adds this call request message, simultaneously, the medium flow IP address of SDP in this call request message is revised as medium flow IP address after the conversion.

In step 405, IMS-ALG will send to the P-CSCF of callee side network through IP address version type conversion and this call request message of revising the medium flow IP address.

Then, in step 406, P-CSCF sends to terminal called with this call request message.

In step 407, terminal called is responded 183 SessionProgress (conversation procedure) message to the P-CSCF of callee side network.In step 408, P-CSCF will receive the IMS-ALG that 183 SessionProgress message send to the callee side network.In step 409, the TrGW of IMS-ALG in this network sends the address transition request.Then, in step 410, TrGW responds this address transition request to IMS-ALG.Then, in step 411, IMS-ALG will send to the S-CSCF of callee side network through 183 Session Progress message after the IP address transition, send to calling terminal by S-CSCF by the Calling Side network.

After this, the user face data intercommunication between the calling and called terminal all needs the IP address class type conversion through IMS-ALG/TrGW.

This shows, support under the signaling plane intercommunication situation at IMS, when the terminal of different IP version is passed through the IMS intercommunication, only need to carry out the conversion of IP address class type at the callee side network, the access times of the address transition face of IMS-ALG/TrGW are dropped to minimum level, thereby shortened the user's face intercommunication time delay between the different IP version terminal as much as possible, improved communication efficiency, improve user experience, promoted the development of IP operation of future generation.In addition, even the network entity among the IMS is not supported the two stacks of IP, as long as support can use the method in the present embodiment under the signaling plane intercommunication situation at IMS yet, only carry out the conversion of IP address class type, thereby reach the effect and the effect of present embodiment at the callee side network.

Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims

1. user's face interoperability methods in the SIP multimedia system is characterized in that, comprises following steps:

2. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 1, and described steps A comprises following substep,

3. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 2, and described step B comprises following substep,

4. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 3, and described step C comprises following substep,

5. user's face interoperability methods in the SIP multimedia system according to claim 4, it is characterized in that, among the described step B, described callee side network of network equipment is known its IP version information by resolving described terminal called domain name, and carries out the contrast judgement of IP version in view of the above.

6. user's face interoperability methods in the SIP multimedia system according to claim 4, it is characterized in that, among the described step C, when described calling and called terminal is carried out the intercommunication of user's face, described transfer gateway receives the user data of described calling terminal and be transmitted to described terminal called behind conversion IP address, receives the user data of described terminal called simultaneously and be transmitted to described calling terminal behind conversion IP address.

7. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 4, and described call request message is the conversation request message of Session Initiation Protocol;

The address information of described calling terminal is carried by following any one territory of described conversation request message: " Contact " territory or " via " territory.

8. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 7, among the described step C:

9. according to user's face interoperability methods in each described SIP multimedia system in the claim 1 to 8, it is characterized in that described SIP multimedia system is one of following:

Internet protocol multimedia subsystem or next generation network.

10. user's face interoperability methods is characterized in that in the SIP multimedia system according to claim 9, and the described network equipment is one of following: