CN100550908C

CN100550908C - A kind of session ability information method of operating and network entity of carrying out

Info

Publication number: CN100550908C
Application number: CN200510134644.0A
Authority: CN
Inventors: 朱雷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-12-13
Filing date: 2005-12-13
Publication date: 2009-10-14
Anticipated expiration: 2025-12-13
Also published as: WO2007068206A1; CN1984135A

Abstract

The invention discloses a kind of session ability information method of operating and network entity of carrying out, this method comprises: after the network entity in the Session initiation Protocol SIP network receives the conversation message of the session ability information that carries, the session ability information that conversation message is entrained is operated.This method can be simplified the process that calling and called side carries out service capability negotiation, thereby reduces the time delay that session is set up.

Description

A kind of session ability information method of operating and network entity of carrying out

Technical field

Technology is set up in the session that the present invention relates in the Session Initiation Protocol network, and particularly a kind of foundation in session carried out session ability information method of operating and network entity in the process.

Background technology

Along with the development of broadband network, mobile communication not only is confined to traditional voice communication, and can be in conjunction with multiple media business such as audio frequency, video, picture and texts.Multiple media business by with present that business (presence), short message, webpage (WEB) are browsed, the combining of data service such as locating information, propelling movement business (PUSH) and file-sharing, can satisfy the multiple demand of subscriber equipment (UE).

Under the promotion of several data service application, normal structure such as 3GPP and 3GPP2 has all successively been released the IMS framework, purpose is to use a kind of standardization open architecture to realize diversified multimedia service application in the mobile network, offers more selection of UE and abundanter impression.

At 3GPP version 5 (R5, Release) stage, introduced IMS, IMS is superimposed upon on the packet field network, is made up of CCF (CSCF), MGCF (MGCF), media resource function (MRF) and home signature user server functional entitys such as (HSS).Wherein CSCF can be divided into serving CSCF (S-CSCF), proxy CSCF (P-CSCF) and three logic entities of inquiry CSCF (I-CSCF) again.S-CSCF is the service switching center of IMS, carries out session control, and peace preservation association's speech phase is in charge of UE information, produces charge information etc.; P-CSCF is the access point that UE inserts IMS, finishes the UE registration, is responsible for service quality (QoS) control and safety management etc.; I-CSCF is responsible for the intercommunication between the IMS territory, and network topology and configuration are externally hidden in distribution and the selection of management S-CSCF, produce metering data etc.The MGCF control gateway realizes the intercommunication of IMS and other network.MRF provides media resource.The subscription data of HSS storage UE and configuration information etc.

On the packet network that the IMS network of 3GPP definition also can be applied to define among the 3GPP2, provide the intercommunication with the polytype network, realize and use the independence of terminal type.Therefore do not limit IMS here and only be applied in relevant network of 3GPP and the application, the access network of other types and the business of bearer network also can realize with the IMS framework with using.

SIP is the IP phone signaling protocol that is proposed by Internet engineering duty group (IETF).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.In IMS, use the signaling control protocol of Session Initiation Protocol as IP multimedia session.

The business platform of IMS network is based on the business platform of Internet protocol (IP) telephone conversation of SIP foundation.When terminal will be enjoyed application service on the IMS network, need between terminal and terminal or AS, set up session, in setting up the process of session, the calling and called terminal need be carried out the negotiation of professional ability, and the network entity in the process of service capability negotiation on the IMS network might participate in the process of service capability negotiation.The professional ability of session is meant the ability of the service needed that realization is begun after session negotiation is finished.The information of professional ability can be carried by the message body (Content) of sip message, can pass through modes such as Content/sdp, Content/application or Content/mime.

In existing 3GPP IMS standard, when the calling and called terminal is carried out session negotiation by the IMS network, calling terminal sends session by the IMS network to terminal called and sets up request message, this request is adopted sip message and is carried session ability information, and this request is through the processing of the network entity in the IMS network.Network entity in the IMS network is transmitted to terminal called with this request, when the session ability information that terminal called carries according to this request judge self do not support the professional ability of calling terminal after, return to network entity or calling terminal error response message in the IMS network, network entity in the IMS network or calling terminal are received negotiation and the conversion of carrying out calling and called terminal traffic ability after the error response message again.

Professional ability described here refers to IMS network of network entity or calling and called terminal required various abilities that possess when realizing business, such as coding/decoding capability, multimedia processing capability, media parameter ability and application program etc., session ability information refers to the description to professional ability, be described such as the method that can use Session Description Protocol (SDP) regulation, can also use that in message body XML voice and SCRIPT method are described etc.

Fig. 1 assists two flow charts for the media parameter ability of existing IMS regulation and stipulation, the network entity that this flow process comprises has: S-CSCF#1, the terminal called UE2 under P-CSCF#1, the UE1 under calling terminal UE1, the UE1, the P-CSCF#2 under the terminal called UE2 and the S-CSCF#1 under the UE1, and its detailed process is:

Step 101, UE1 have increased coding parameter in the load of SDP, coding parameter has reflected the professional ability of UE1 and the coding parameter of expecting in session.

Step 102, set up in the request (INVITE) in session that UE1 sends and to have carried SDP, issue P-CSCF#1.

Step 103, P-CSCF#1 check the media parameter information of describing among the SDP, if owing to local policy reason or QoS mandate reason, P-CSCF#1 can not allow media parameter information to use in session, just refuses the negotiation of professional ability.In refuse information, can comprise enough information and be notified to UE1, so that UE1 initiates session negotiation next time according to these information.

Step 104, P-CSCF#1 allow media parameter information to use in session, and P-CSCF#1 is transmitted to S-CSCF#1 with INVITE.

Step 105, S-CSCF#1 are checked the media parameter information of describing among the SDP, if signatory owing to local policy reason or UE1, S-CSCF#1 can not allow media parameter information to use in session, just refuses the negotiation of professional ability.In refuse information, can comprise enough information and be notified to UE1, so that UE1 initiates session negotiation next time according to these information.

Step 106, S-CSCF#1 allow media parameter information to use in session, and S-CSCF#1 is transmitted to S-CSCF#2 with INVITE.

Step 107, S-CSCF#2 are checked the media parameter information of describing among the SDP, if signatory owing to local policy reason or UE2, S-CSCF#2 can not allow media parameter information to use in session, just refuses the negotiation of professional ability.In refuse information, can comprise enough information and be notified to UE1, so that UE1 initiates session negotiation next time according to these information.

Step 108, S-CSCF#2 allow media parameter information to use in session, and S-CSCF#2 is transmitted to P-CSCF#2 with INVITE.

Step 109, P-CSCF#2 check the media parameter information of describing among the SDP, if owing to local policy reason or QoS mandate, P-CSCF#2 can not allow media parameter information to use in session, just refuses the negotiation of professional ability.In refuse information, can comprise enough information and be notified to UE1, so that UE1 initiates session negotiation next time according to these information.

At this moment P-CSCF#2 generates authorization token (Authorization-Token).

Step 110, P-CSCF#2 allow media parameter information to use in session, and P-CSCF#2 is transmitted to UE#2 with INVITE, and authorization token is included among the INVITE.

One group of complete coding of session is finished in step 111, UE#2 decision, common factor with coded message among the SDP of contrast in message, just on the port numbers of this media description, be not made as 0 if which kind of medium is not supported, distribute a port numbers inserting on the port numbers of the media description of support media.

Step 112, UE2 return the SDP response to P-CSCF#2, i.e. the description of group media stream and coding.

Step 113, P-CSCF#2 authorize the QoS resource that keeps these Media Streams and coding.

Step 114, P-CSCF#2 transmit SDP and respond to S-CSCF#2.

Step 115, S-CSCF#2 transmit SDP and respond to S-CSCF#1.

Step 116, S-CSCF#1 transmit SDP and respond to P-CSCF#1.

Step 117, P-CSCF#1 authorize the QoS resource that keeps these Media Streams and coding.

Step 118, authorization token are included in the SDP description, and P-CSCF transmits SDP and responds to UE#1.

Which Media Stream step 119, UE1 decision use in session, which coding parameter the UE1 decision uses in Media Stream.If can select more than a kind of Media Stream in a session, if perhaps can select more than a kind of coding parameter in a Media Stream, UE1 needs to consult to reduce to one with the quantity with coding parameter with UE2 once more so.

Step 120～124, UE1 send the SDP (offered SDP) of proposal to UE2.

Make and can consult the coding parameter that obtains being used in this way in the session negotiation process in session, this coding parameter is the professional ability that the calling and called terminal is consulted.

In the process of session negotiation, the request whether network entity is accepted to consult according to reason decisions such as contracting of local policy, Quality of Service mandate or user, if network entity refusal session negotiation, just return refusal response, and in the response of refusal, provide enough information to offer calling terminal to make calling terminal decision how carrying out session negotiation next time.

Fig. 2 sets up the flow chart of the signaling moiety intercepting of MPTY session by the IMS network for prior art calling and called terminal.The IMS network entity that this flow process relates to comprises: the AS in S-CSCF, the IMS network, provide the MRF of IMS network media resource, its concrete steps are:

Step 200, calling terminal UE1 ask to the INVITE that S-CSCF sends the session ability information that carries UE1, and service identification is carried in this request, is used to identify the type of service of this service request.

Step 201, S-CSCF return to UE1 and receive this INVITE request responding, i.e. 100Trying message.

For each INVITE request, the response of a 100Trying message all can be arranged, Fig. 2 does not identify in following flow process.

Step 202, the S-CSCF service identification that request is carried according to INVITE determine to handle the AS of this service request, and the INVITE request of carrying the session ability information of UE1 is transmitted to determined AS.

Step 203, AS return the INVITE request responding and give S-CSCF.

The INVITE request that step 204, S-CSCF will carry the session ability information of UE1 sends to terminal called UE2.

The session ability information of step 205, the UE2 UE1 that request is carried according to INVITE, judge self and do not support the professional ability of UE1, return to S-CSCF and carry the error message of the session ability information that UE2 supports, this error message represents not support the UE1 professional ability, be 606 Response (Not Acceptable, UA SDP) in the 3GPP IMS standard.

Step 206, S-CSCF send the affirmation message that receives error message, i.e. ACK message to UE2.

Step 207, S-CSCF transmit error message to AS, i.e. 606-2 message.

After step 208, the AS that receives error message carry out the judgement of professional ability conversion, judge and to carry out the conversion of professional ability, change step 209 over to.

Step 209, AS return the affirmation message that receives error message, i.e. ACK-2 message to S-CSCF.

Step 210, AS send the INVITE request of carrying the session ability information that UE2 supports to S-CSCF, and the SDP of this UE2 is obtained from the error message of the session ability information that carries UE2 and support by AS.

The INVITE request that step 211, S-CSCF will carry the SDP of UE2 support is transmitted to MRF.

Step 212, MRF judge according to the session ability information that the media resource of self the storing UE2 that request is carried to INVITE supports, judge the session ability information that UE2 supports that the INVITE request is carried, transmission is carried the message of this INVITE of affirmation request of media parameter to S-CSCF, promptly carries the 200OK response of media parameter.

Step 213～214, S-CSCF send to AS with the 200OK response, and AS returns to the affirmation message that S-CSCF receives this 200OK message, i.e. ACK-3 message.

Step 215, S-CSCF return the affirmation message of receiving this 200OK message, i.e. ACK-3 message to MRF.

Step 216, determine that the data of being transmitted between UE1 and the UE2 all will be carried out the conversion of professional ability according to the professional ability that SDP and UE2 supported that UE1 supported after, continue to carry out the follow-up session step of setting up according to 3GPP IMS standard, between UE1 and UE2, set up session.

From Fig. 1 and the described scheme of Fig. 2 as can be seen, in the process of carrying out the calling and called terminal capability negotiation, when not supporting the professional ability of calling terminal or professional ability that the network entity on the session negotiation transmission path is not supported calling terminal, terminal called can not send error message, after the network entity on the session negotiation transmission path or calling terminal receive the error message of terminal called, can carry out the service capability negotiation between the calling and called terminal again, finish the session of this calling and called terminal.

Because terminal called returns error response message to calling terminal when receiving that the session request of setting up can not be set up session, and notifies the reason that can not accept session and consult, calling terminal carries out session negotiation again according to the prompting of error response message.Calling terminal after receiving error response message, consultation business service ability again between the calling and called terminal again, the time delay that this can cause session to set up, thereby influence quality of the conversation between the calling and called terminal.Further, in some service application based on the IMS network, such as: based on the PTT (PoC of cellular network, PTT over Cellular) business, the time delay of setting up for session has strict requirement, when terminal called returns error message, the ability of consultation business service again between the calling and called terminal again, this has increased the time delay that session is handled, and has reduced the satisfaction that the user uses, and development in the IMS network has caused obstruction to PoC service for this.

Further, multimedia application development along with the packet switching network of dialogue-based initiation protocol (SIP), the foundation that a plurality of network entities participate in session simultaneously can appear, a plurality of network entities provide the situation of a business jointly, for example by different media resource processing entities difference processing audio and video media, at this moment the media parameter of bearing description by the SDP agreement may comprise a plurality of network entities of different operators network of the service that participates in or the media formats and the coding parameter of terminal, all will increase to some extent in quantity with on the kind.But the describing method that existing SDP agreement is supported, the description to medium to separate sources just can not distinguish in the description of SDP agreement to media parameter, and the SIP that uses the recipient of session negotiation is not supported in yet and carries the demand that a plurality of different SDP from heterogeneous networks entity or terminal describe in the sip message body.The demand that these display along with technical development, all making needs technically priority and attribute to the session ability information of a session describing to define, and SIP is carried out necessary expansion to the use of session ability information.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of session ability information method of operating of carrying out, and this method can be simplified the process of calling and called terminal carrying out service capability negotiation, thereby reduces the time delay that session is set up.Further, this method can also be simplified the service capability negotiation process when the SIP network provides PoC service, reduce the time delay that session is set up.

The present invention also provides a kind of session ability information network operating entity that carries out, and this network entity can be simplified the process of calling and called terminal carrying out service capability negotiation, thereby reduces the time delay that session is set up.Further, this method can also be simplified the service capability negotiation process when the SIP network provides PoC service, reduce the time delay that session is set up.

According to above-mentioned purpose, technical scheme of the present invention is achieved in that

A kind of session ability information method of operating of carrying out, this method comprises:

After network entity in the Session initiation Protocol SIP network receives the conversation message that carries session ability information, each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or its combination in any operation.

Described conversation message is that session is set up request message, session and set up that response message, session are set up negotiation message, session is set up and consulted acknowledge message, session updates message or session updates acknowledge message.

It is INVITE or REFER message that request message is set up in described session; It is 200OK message that response message is set up in described session; It is 183 message that negotiation message is set up in described session; Described session is set up and consulted acknowledge message is PRACK message; Described session updates message is UPDATE message or REINVITE message; Described session updates acknowledge message is a 200OK message.

Described session ability information is Session Description Protocol SDP, application program, positional information or presents presence information;

Wherein, SDP comprises one of description, the code rate of session information, session initiator contact details, temporal information, link information, code/decode type, bandwidth information, encapsulation password, transfer protocol session attribute, the speed of Media Stream, description of grouping inter-packet gap time, board and size and Orientation, multi-party conversation type, font setting, media description language, coding quality and formatting parameter medium property or its combination in any; Application program comprises one of text, the tinkle of bells, video media, audio frequency media, animation and executive program or its combination in any.

Described increase operating process is:

Network entity with the session ability information of SIP network support or/and configuration information be increased in the conversation message.

The session ability information of described SIP network support or/and the acquisition process of configuration information be: provide store session ability information among the function Capability Provide Function or/and configuration information in ability, network entity gets access to session ability information or/and configuration information by inquiry Capability Provide Function.

The session ability information of described SIP network support or/and the acquisition process of configuration information be:

Network entity is stored the session ability information of SIP network support in advance or/and configuration information, and network entity directly gets access to the session ability information and/or the configuration information of SIP network support.

Described each different piece information in the entrained session ability information of conversation message one of made amendment, increased and delete or the process of its combination in any operation is:

Network entity one of is made amendment, is increased and delete each different piece information in the attribute information of the entrained session ability information of conversation message or its combination in any operation.

Each different piece information in the described session ability information entrained to conversation message one of make amendment, increase and delete or its combination in any operation before, also comprise determining step:

Judge whether network entity one of is made amendment, increased and delete or its combination in any operation each different piece information in the entrained session ability information of conversation message, if carry out step to each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or its combination in any is operated; Otherwise, process ends.

Describedly judge that whether network entity one of is made amendment, increased and delete each different piece information in the entrained session ability information of conversation message or its combination in any operation is that one of the ability according to network entity, the session ability information of network entity and configuration information of network entity or its combination in any are judged, the session ability information of this network entity be obtain or storage in advance.

When conversation message is that session is set up request message, when negotiation message or session updates message are set up in session, described each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or the process of its combination in any operation is:

Session ability information that network entity affirmation conversation message carries and the attribute information in the session ability information confirm that the session ability information that carries is the SIP network support;

Network entity obtains the session ability information of storage or/and configuration information from self or other network entities, according to the session ability information that gets access to or/and configuration information, the session ability information that conversation message is carried and the attribute in the session ability information one of adds, deletes and revise or its combination in any operation.

When conversation message is that session is set up response message, when acknowledge message or session updates acknowledge message are set up in session, described each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or the process of its combination in any operation is:

Business support ability information that network entity affirmation conversation message carries and the attribute information in the business support ability information, selected session ability information of callee that the identification conversation message is entrained and the attribute information in the selected session ability information;

Network entity according to preset strategy or/and the ability of network, confirm that the attribute information in selected session ability information of callee and the selected session ability information is effective selection, revise or/and the deletion callee selected be not the session ability information effectively selected and the attribute information in the session ability information.

Described session ability information is or/and configuration information comprises one of the form of medium type, host-host protocol, medium, transport address, port numbers and attribute information of medium or its combination in any.

Described conversation message comprises one or more session ability information piece.

Described session ability information piece is concluded by attribute information, and the session ability information piece is discerned by network entity by the attribute information under it.

Described session ability information piece is distinguished by one of numbering, session ability information opening flag information, professional ability end mark information and length information or its combination in any.

Described attribute information comprises: one of the importance of the session ability information after operator's informaiton, network entity type information, the network entity sign of making amendment, session ability information action type, session ability information operation flag, the operation and precedence information or its combination in any.

Described attribute information is carried in the conversation message that adopts Session Description Protocol SDP, perhaps is carried in the message header or message body of the conversation message that adopts SIP.

The information of described attribute information sign session ability information piece belonging network entity is or/and the prior information of sign session ability information piece.

Described conversation message is for adopting the conversation message of SDP, and the session ability information that described conversation message carries adopts describes media information Language XML or script SCRIPT description.

Described network entity is application server AS, CCF CSCF, media resource function MRF or sip server;

Wherein AS controls PoC service function, MPTY server Conference Server, service capacity interactive managing device Service Capability InteractionManager (SCIM), presents service server Presence Server or Interworking gateway IWF for control PTT PoC service function, participation; CSCF is proxy-call session control function P-CSCF, serving-call session control function S-CSCF or query call controlled function I-CSCF; Sip server is the ALG SIP-ALG of CCF CSCF or exhalation borde gateway controlled function BGCF or Session Initiation Protocol; MRF is that media resource control MRFC or media resource are handled MRFP.

Described SIP network comprises the same SIP network under calling party and the callee;

Perhaps described SIP network comprises SIP network and the affiliated SIP network of callee under the calling party; Perhaps described SIP network comprises SIP network, the SIP network under the callee and the SIP network under the calling party and the middle one or more SIP network that passes through of the SIP network under the callee under the calling party.

A kind of session ability information network operating entity, this network entity comprises: the receiver module of Lian Jieing, tactful acquisition module and processing module, respond module that is connected with processing module and forwarding module respectively successively; Wherein, receiver module, respond module and forwarding module also are connected with each terminal in the Session initiation Protocol SIP network;

The calling party sends to receiver module with session message, after the strategy acquisition module gets access to the strategy of handling conversation message, the strategy that the conversation message that receiver module is received is transparent to processing module and will handles conversation message sends to processing module, after processing module adopts the strategy of handling conversation message that conversation message is handled, the generation session is set up request message and is sent to forwarding module, perhaps generating session sets up response message and sends to respond module, forwarding module is set up request message with session and is sent the callee, and respond module is set up response message with session and sent to the callee.

This network entity comprises that also ability provides function Capability provide Function, is connected with tactful acquisition module in the network entity, is used for providing the strategy of the processing conversation message of self preserving to the tactful acquisition module of network entity.

Wherein AS controls PoC service function, MPTY server Conference Server, service capacity interactive managing device Service Capability InteractionManager, Interworking gateway IWF or presents service server Presence Server for control PTT PoC service function, participation; CSCF is proxy-call session control function P-CSCF, serving-call session control function S-CSCF or query call controlled function I-CSCF; Sip server is the ALG SIP-ALG of exhalation borde gateway controlled function BGCF or Session Initiation Protocol; MRF is that media resource control MRFC or media resource are handled MRFP.

Described SIP network comprises the same SIP network under calling terminal and the terminal called;

Perhaps described SIP network comprises SIP network and the affiliated SIP network of terminal called under the calling terminal;

Perhaps described SIP network comprises SIP network, the SIP network under the terminal called and the SIP network under the calling terminal and the middle one or more SIP network that passes through of the SIP network under the terminal called under the calling terminal.

From such scheme as can be seen, the present invention is in calling and called terminal carrying out service capability negotiation process, when request message is set up in the session of sending the professional ability of carrying the calling party to the SIP network as the calling party, network entity in the SIP network can directly be changed session and set up content in the message body of request message, the session ability information of the SIP network support of its acquisition is carried in this request message sends to the callee, the session ability information that is sent out has attribute information to distinguish, attribute information can be used as the foundation of network entity to the session ability information operation, selected to send to after the professional ability of its support the network entity in the SIP network by the callee, the network entity in the SIP network carries out subsequent treatment according to the professional ability that the callee who is accepted supports.In addition, the present invention is in calling and called terminal carrying out service capability negotiation process, the callee also can set up response message to the session that the SIP network returns the professional ability of carrying the calling party, network entity in the SIP network can directly be changed session and set up content in the message body of request message, the session ability information of the SIP network support of its acquisition is carried in this request message sends to the calling party, selected to send to after the professional ability of its support the network entity in the SIP network by the calling party, the network entity in the SIP network carries out subsequent treatment according to the professional ability that the calling party who is accepted supports.

Because calling terminal of the present invention also waits until that unlike prior art terminal called returns the negotiation of carrying out professional ability between the calling and called terminal after the refuse information again, but directly provide the session ability information of SIP network to select for terminal called to terminal called, thereby simplified the process of calling and called terminal carrying out service capability negotiation, reduced the time delay that session is set up.

Because professional ability operational network entity of the present invention and method also can be set up in the process and used carrying out PoC session, therefore this method is when the SIP network provides PoC service, simplify the service capability negotiation process, reduce the time delay that session is set up, improve the experience that the user uses.

Description of drawings

Fig. 1 is the media parameter capability negotiation flow chart of existing IMS regulation and stipulation;

Fig. 2 sets up the flow chart of the signaling moiety intercepting of MPTY session by the IMS network for prior art calling and called terminal;

Fig. 3 carries out the signaling process figure of service capability negotiation for the present invention;

Fig. 4 for the present invention when the IMS network using PoC service, the signaling process figure of terminal carrying out service capability negotiation embodiment one;

Fig. 5 for the present invention when the IMS network using PoC service, the signaling process figure of terminal carrying out service capability negotiation embodiment two;

Fig. 6 provides the professional ability conversion schematic diagram of SDP that terminal called is supported jointly for the application server in the IMS network of the present invention;

Fig. 7 carries out the flow chart of the signaling embodiment of service capability negotiation in the IMS network for the present invention;

Fig. 8 carries out the flow chart of the signaling embodiment two of service capability negotiation in the IMS network for the present invention;

The message body that Fig. 9 sets up in the request message to session for the network entity in the SIP network of the present invention increases the tinkle of bells and the signaling process figure that revises the tinkle of bells;

Figure 10 sets up the signaling process figure that message body in the request message increases the description of the media information of supporting video type for the network entity in the SIP network of the present invention to session;

Figure 11 is the structural representation of session ability information operation of the present invention;

Figure 12 is the structural representation of network entity of the present invention.

Embodiment

In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.

Method provided by the invention can be used for the IMS network, but is not limited to the IMS network, and the present invention can be used for any SIP network.

Calling party of the present invention is calling terminal, the AS that carries out customer's representative UA or the borde gateway of SIP network; Described callee is the network entity in terminal called or the SIP network.Certainly, as the entity in the IMS network of calling party SIP network and different as the entity in the IMS network of callee's SIP network.

The present invention is in the process of service capability negotiation, and network entity has comprised the operation of conversation message and setting and information reconciliation in the service capability negotiation process impelled the service capability negotiation process to carry out effectively.Network entity can be that the operation that request message is set up in session also can be the operation of session being set up response message to the operation of conversation message.

In the present invention, conversation message can be set up request message, session for session and set up that response message, session are set up negotiation message, session is set up and consulted acknowledge message, session updates message or session updates acknowledge message.Wherein, to set up request message be INVITE or REFER message in described session; It is 200OK message that response message is set up in described session; It is 183 message that negotiation message is set up in described session; Described session is set up and consulted acknowledge message is PRACK message; Described session updates message is UPDATE message or REINVITE message; Described session updates acknowledge message is a 200OK message.

Network entity in the SIP network is in the process of session negotiation, content in the session ability information in the conversation message that can send the calling party who receives is added, is deleted or/and revise, session ability information is provided with attribute information, network entity has also comprised interpolation to the attribute information of session ability information, deletion or/and revise to the modification of message, and conversation message is that request message is set up in session or response message is set up in session.Session ability information in the described conversation message can use the method for SDP agreement regulation to describe, and can also adopt and describe media information language (XML) or script (SCRIPT) description.The modification to session ability information to SDP agreement regulation can be carried out some expansions to the describing method of SDP agreement regulation.

The session ability information of describing with SDP is the example explanation in the present invention, network entity joins session with the session ability information of supporting in the SIP network and sets up in the message body of request message, session ability information use attribute data separation in the message offers the callee and selects.After the callee receives that request message is set up in session, can from this message, select the result of the professional ability of expectation as the service capability negotiation of this session.Carried the professional ability of the session of its selection in the response message that the callee returns, the network entity on the SIP network is set up the conversion that the professional ability of carrying in the response message determines whether needs carry out professional ability according to the session of returning.Network entity on the SIP network can also increase, delete or/and revise professional ability according to the professional ability that session is set up in the response message, and response message is set up in the session of returning is sent to the calling party.

Network entity joins session with the session ability information of supporting in the SIP network and sets up foundation in the request message, can be network setting in advance on network entity, add and modification session ability information and attribute information according to fixed form, can be the session ability tenability according to the network that obtains on the network entity, decision be added the session ability information of network and the modification session ability information.

Need to prove that in carrying out the session negotiation process, the SIP network of conversation message approach not only has only one, also has a plurality of.Described SIP network is the SIP network under calling party and the callee; Perhaps described SIP network is SIP network and the affiliated SIP network of callee under the calling party; Perhaps described SIP network is SIP network, the SIP network under the callee and the SIP network under the calling party and the middle one or more SIP networks that pass through of the SIP network under the callee under the calling party.The attribute information of session ability information can reflect the conversation message approach or participate in handling the information of the SIP network of session ability information, as called network, caller network, centrally controlled network, middle passing through network, can also reflect the flag information of the network of approach SIP network or participation processing session ability information

In the present invention, the professional ability of supporting on the SIP network can be kept on the SIP network of network entity in advance, also can be kept at independently on the capable server (Capability Server).CapabilityServer is logical functional entity on the SIP network, the professional ability of the network entity on the Capability Server on the in store SIP network, these professional abilities can be distinguished preservation according to different network entities on Capability Server.Network entity on the SIP network is set up request message or session when setting up session ability information in the response message revising session, the professional ability that network entity can be supported on Capability Server inquiry SIP network, Capability Server returns the network entity that session ability information is given inquiry.Network entity joins the session ability information that inquires that request message is set up in session or session is set up in the response message, offers callee or calling party and selects.

Certainly Capability Server also can be provided function (Capability ProvideFunction) to substitute by ability.

Session ability information of the present invention is that example describes with SDP, in the realization of reality, can be any protocol conversation information of consulting by SIP, the difference of the agreement that this information is used according to session and difference, such as when consult be Real-time Transport Protocol the time, this session ability information can be a code/decode type or/and code rate etc., and when consult be MSRP the time, this session ability information can be the speed of Media Stream etc.When consulting some application programs, this session ability information can also comprise positional information, present multiple information such as (presence) information and the tinkle of bells.SDP comprises that the speed, grouping inter-packet gap time, board direction, multi-party conversation type, font setting, media description language, coding quality of description, code rate, the Media Stream of session information, session initiator contact details, temporal information, link information, code/decode type, bandwidth information, encapsulation password, transfer protocol session attribute are or/and the description of formatting parameter medium property; Application program comprises that text, the tinkle of bells, video media, audio frequency media, animation are or/and executive program.

The present invention can revise the professional ability in the session negotiation on the SIP network network entity is that the network entity in the described SIP network is AS, CSCF, MRF, sip server.Wherein AS controls PoC service function PoC Server (Participating), MPTY server (Conference Server), service capacity interactive managing device (Service Capability Interaction Manager (SCIM)) or/and presence server (Presence Server) for control PTT PoC service function PoC Server (Controlling), participation; CSCF can for P-CSCF, S-CSCF or/and I-CSCF; Sip server can be for exhalation borde gateway controlled function (BGCF) or/and the ALG of Session Initiation Protocol (SIP-ALG).

In the present invention, the calling party who mainly consults as initiation session with UE is that example describes.In implementation procedure, the callee of the calling party of initiation session and termination session can be UE, also can be to carry out customer's representative's (UA) the AS or the borde gateway of SIP network.Promptly the calling and called UE in the SIP network can be used as the calling party and the callee uses service capability negotiation method of the present invention to carry out session negotiation; Calling UE in the SIP network and AS can be used as the calling party and the callee uses service capability negotiation method of the present invention to carry out session negotiation; Two AS in the SIP network also can be used as the calling party and the callee uses service capability negotiation method of the present invention to carry out session negotiation.

The SDP1 that uses among the following embodiment, descriptions such as SDP2 refer to the session ability information that uses SDP to describe, and can also comprise the attribute information of session ability information among SDP1 and the SDP2.

Fig. 3 carries out the signaling process figure of service capability negotiation for the present invention, the network entity that relates to comprises: calling party, callee, calling party's side network entity, session negotiation processing entities, Capability Server, callee's side network entity, and its concrete steps are:

Step 300, calling party send session to calling party's side network entity and set up request message, and this request message carries calling party's session ability information.

This session ability information can be described with SDP1, comprises the parameter about professional ability such as professional ability type, media parameter and coding parameter among the SDP1.The attribute information of SDP1 comprises that session ability information comes from the calling party, the operator logo under the priority of business information, business information etc.

Step 301, calling party's side network entity return the response that receives this request message to the calling party, i.e. 100Trying message.

Set up request message for each session, the response of a 100Trying message all can be arranged, the present invention does not identify in following flow process.

Step 302, calling party's side network entity determine that according to this request message how handling session sets up request message, determine how the session negotiation processing entities that request message offers the service capability negotiation function of supporting the present invention's regulation is set up in session, this request message is sent to the session negotiation processing entities.

The present invention can set up in session service identification is set in the request message, identify the service capability negotiation that this request message will carry out, calling party's side network entity is defined as the session negotiation processing entities of this session negotiation service according to the service identification that is provided with in this request message.

Similarly, which kind of service calling party's side network entity also can provide according to the calling party that the service identification that is provided with in this request message is defined as initiating this request message.

Step 303, session negotiation processing entities can send the professional ability query requests that the SIP network is supported to Capability Server.

Step 304, Capability Server return the professional ability query requests response that the SIP network is supported for the session negotiation processing entities, the session ability information that the SIP network is supported is carried in this response, for example description SDP1, SDP2, SDP3 and the SDP4 of the session ability information supported of SIP network.

Step 305, session negotiation processing entities, can add according to being arranged in the conversation message in advance, deletion is or/and revise session ability information and attribute information, carry the session ability information that the IMS network is supported to the transmission of calling party's side network entity, set up request message as the session of SDP1, SDP2, SDP3 and SDP4.

This session that step 306～307, calling party's side network entity will be received is set up request message and is sent to the callee by callee's side network entity, comprising session ability information SDP1, SDP2, SDP3 and SDP4, calling party's side network entity information that the session ability information need be set a property can constitute the attribute information of session ability information according to the source of a plurality of SDP, attributes such as priority that network is determined.

Step 308～309, receive this session and set up the callee of request message and carry session ability information according to this request message, the professional ability described of SDP1, SDP2, SDP3 and SDP4 for example, select the professional ability self supported, professional ability as SDP4 describes returns to the response that calling party's side network entity carries the description SDP4 of session ability information by callee's side network entity.

The response of the description SDP4 that carries session ability information that step 310, calling party's side network entity will receive is transmitted to the session negotiation processing entities.

The description SDP4 of the session ability information that step 311, session negotiation processing entities are carried response and the description SDP1 of the session ability information that the calling party supports compare, judge whether both are identical, if, determine that the data of transmitting between the calling and called side directly send to the other side by the session negotiation processing entities, execution in step 312; If not, determine that the data of transmitting between the calling and called side carry out sending to the other side, execution in step 312 after the professional ability conversion.

Step 312～313, session negotiation processing entities send the 200OK response by calling party's side network entity to the calling party, and the service capability negotiation between this calling and called side is finished.

Certainly, if the session negotiation processing entities self stores all professional abilities of SIP network support, then the present invention can omit step 303～304, and the session negotiation processing entities directly is carried at session with the professional ability of self storage and sets up in the request message and send in step 305.

Session negotiation processing entities described here can independently exist, also can be integrated in any one network entity in the SIP network, when the session negotiation processing entities was integrated in the network entity, this network entity promptly can carry out the session negotiation process according to the session negotiation optimization method of the present invention's regulation.

The professional ability reciprocal process of session negotiation of the present invention can be suitable for a plurality of scenes in, all support session service capability negotiation method of the present invention as calling party's network and callee's network; Calling party's network support session service capability negotiation of the present invention method, callee's network are not supported session service capability negotiation method of the present invention; Calling party's network is not supported session service capability negotiation method of the present invention, callee's network support session service capability negotiation of the present invention method; Do not distinguish calling and called side's network.

Network entity in calling party's network and the callee's network is the embodiment of supporting business capability negotiation all.

With in the IMS network, calling party's network and callee's network all situation of supporting business capability negotiation describe.The calling party here can be UE, also can be the network entity in the IMS network.When calling party and callee belong to different IMS network, CSCF in the different IMS network, AS and MRF etc. can use method of the present invention, session ability information in the message body of conversation message is made amendment, and add the session ability information of IMS network support.

In this example, the method that the network entity in the IMS network at calling party place and the IMS network at callee place can use the present invention to describe is revised the session ability information in the session negotiation, and is offered the callee.In the session ability information, can comprise the attribute information of handling session ability information, can comprise the attribute information of session ability information, can also be the information of handling the network entity of session ability information.The calling party sends session according to expectation to the IMS at its place network and sets up request message, has carried the description SDP1 of the session ability information of calling party's expectation in this request message.P-CSCF#1 in the IMS network at calling party place and S-CSCF#1 set up the description SDP1 of session ability information of request message and the local policy of operator according to the session of receiving, local policy comprises and setting in advance, can also be according to the ability of network, set up the description SDP2 that adds the session ability information of calling party's place IMS network support in the message body of request message in session, and the IMS network that request message sends to the callee place is set up in session.After P-CSCF#2 on the IMS network at callee place and S-CSCF#2 receive that request message is set up in the session of the description SDP1 that carries session ability information and SDP2, set up the description SDP3 and the SDP4 of the session ability information of the IMS network support that adds the callee place in the request message in session according to operator's local policy of the IMS network at callee place.Network entity on the IMS network at the IMS at calling party place network and callee place joins description SDP1, SDP2, SDP3 and the SDP4 that the session ability information in the request message is set up in session, offers the callee and selects.

At the session ability information that the network entity on the IMS network at the IMS at calling party place network and callee place also can be supported on the inquiry of the Capability Server on the IMS network of its place IMS network, the description SDP of the session ability information of supporting on the IMS network that Capability Server returns.During session ability information that the network entity on the IMS network at place, calling and called side is supported on adding the IMS network, need follow the local policy of operator and under the control of operator, local policy derives from operator ground and is provided with, can be kept on the Capability Server, also can be kept on other network entities.

Description SDP1, SDP2, SDP3 and the SDP4 that has carried the session ability information that is added by the network entity on the IMS network of calling party and process in the request message set up in the session that the callee receives, the callee selects the description SDP2 of the session ability information of expectation according to the professional ability on the callee, and has carried the description SDP2 of session ability information in the response message that returns.Therefore, all support to have finished the process of service capability negotiation in the process of professional ability of the present invention at calling party IMS network and callee IMS network.

When calling party and callee belong to different SIP networks, and need AS to add the control of session and when handling, set up process the present invention is described in the IMS network, to carry out session.In the signalling interactive process that session is set up, there are P-CSCF#2, S-CSCF#2 and AS#2 in the IMS network at P-CSCF#1, S-CSCF#1 in the IMS network at calling party place and AS#1, callee place to participate in.S-CSCF#1 in the IMS network at calling party place can revise session that the calling party sends according to local policy and set up session ability information in the request message, the description SDP2 of the session ability information of calling party place IMS network support is joined in the message body, AS#1 in the IMS network at calling party place can set up session request message and change, in the description SDP3 of the session ability information of the IMS network support at the calling party place that AS#1 can be obtained and the message body that SDP4 joins session negotiation.

The description SDP3 of other session ability informations of the IMS network support that AS#1 obtains and the method for SDP4, can be kept in advance on the AS#1, can obtain from other AS that participate in session, also can obtain from the Capability Server inquiry of preserving these session ability informations.

During professional ability that the network entity on the IMS network of calling party place (comprising P-CSCF#1, S-CSCF#1 and AS#1) is supported on adding the IMS network, need follow the local policy of operator and under the control of operator, local policy derives from operator ground and is provided with, can be kept on the CapabilityServer, also can be kept on other network entities.S-CSCF#1 in the IMS network of calling party place is responsible for the session negotiation that AS#1 handled is forwarded on the IMS network of callee place, the description of the session ability information of session negotiation can comprise SDP1, SDP2, SDP3 and SDP4, and the attribute information of session ability information also can be set for SDP1, SDP2, SDP3 and SDP4.

P-CSCF#2 on the IMS network of callee place and S-CSCF#2 are responsible for checking session ability information and its attribute information of session negotiation, according to operator's local policy, the session ability information of forbidding on the IMS network of deletion callee place, according to operator's local policy the description SDP5 of the session ability information of callee place IMS network support being joined session sets up in the request message, and SDP5 is provided with attribute information for session ability information, according to the content of session negotiation session is set up on the AS#2 that request message is forwarded to callee place IMS network.AS#2 on the IMS network at callee place can set up session request message and change, the description SDP6 and the SDP7 of the session ability information of the IMS network support at the calling party place that AS#2 can be obtained join in the conversation message, session ability information SDP6 that is added into and the SDP7 information that sets a property.

The description SDP6 of other session ability informations of the IMS network support that AS#2 obtains and the method for SDP7 are, can be kept in advance on the AS#1, can obtain from other AS that participate in session at the IMS at callee place network, also can obtain from the CapabilityServer inquiry of preserving these session ability informations.

During professional ability that the network entity on the IMS network of callee place (comprising P-CSCF#2, S-CSCF#2 and AS#2) is supported on adding the IMS network, need follow the local policy of operator and under the control of operator, local policy derives from operator ground and is provided with, can be kept on the CapabilityServer, also can be kept on other network entities.At this moment description SDP1, SDP2, SDP3, SDP4, SDP5, SDP6 and the SDP7 of the session ability information that carries in the request message set up in session.These session ability informations use the method for SDP agreement regulation to be divided into a plurality of session ability information pieces in message, and a plurality of session ability information pieces use the session ability information attribute to distinguish.

Description SDP2, SDP3, SDP4, SDP5, SDP6 and the SDP7 of P-CSCF#2, the S-CSCF#2 of the IMS network at P-CSCF#1, the S-CSCF#1 of the IMS network at calling party place and AS#1 and callee place and the session ability information of AS#2 in message body select to offer the callee.

The IMS network at callee place is set up request message with session and is sent to the callee, the callee selects the description SDP1 of the session ability information of expectation according to session ability information and its professional ability that request message is set up in session, and carries the description SDP1 of the session ability information of its selection in the response message that returns.Therefore, all support if AS has participated in the process of session negotiation, to have finished the process of service capability negotiation in the session negotiation process of professional ability of the present invention at calling party IMS network and callee IMS network.

In last example, P-CSCF#2, the S-CSCF#2 of the IMS network at P-CSCF#1, the S-CSCF#1 of the IMS network at calling party place and AS#1 and callee place and AS#2 have changed the session ability information that request message is set up in session according to method of the present invention.

How below specify Capability Server uses in the professional ability of SIP network is mutual.

Capability Server has preserved the professional ability that can support in the SIP network, and concrete professional ability is preserved according to different functional entitys, is illustrated with the operating position in the IMS network.The network entity of preserving professional ability on the IMS network can be CSCF, and AS or MRF comprise these network entities but be not limited to these network entities.The professional ability that the present invention describes with SDP is how to use Capability Server in the preservation of example explanation session ability information and the service capability negotiation process.

Network entity on the SIP network can be kept at the professional ability that provides support for business on the Capability Server, professional ability is preserved according to different network entities, when other network entities on the SIP network when Capability Server inquiry provides professional needed session ability information, the professional ability that can support on the SIP network that Capability Server retrieval is preserved, and the local policy of following operator uses descriptor format that the SDP agreement stipulates that the description of session ability information is returned to the network entity of inquiring about in query response message.Different network entities all can be the network entity of supporting business ability in the inquiry IMS network in the IMS network.

In the negotiations process of IMS BlueDrama, network entities such as CSCF, AS and MRF are as follows to the use detailed process of CapabilityServer.

When calling party and callee belong to different SIP networks, with the operating position in the IMS network is example, in the signalling interactive process of session negotiation, there are P-CSCF#2, S-CSCF#2 and AS#2 in the IMS network at P-CSCF#1, S-CSCF#1 in the IMS network at calling party place and AS#1, callee place to participate in.P-CSCF#1, S-CSCF#1 in the IMS network at calling party place can revise the description SDP1 that the session ability information in the request message is set up in session that the calling party sends, description SDP2 with the session ability information of calling party place IMS network support joins in the message body according to the local policy of operator, and is provided with attribute information for session ability information SDP2.The method that P-CSCF#1, S-CSCF#1 obtain the session ability information of IMS network support can be to send the professional ability inquiry to Capability Server#1, carries out next step operation behind the professional ability Query Result in receiving Capability Server#1 return messages.AS#1 in the IMS network at calling party place can judge the message body change of session being set up request message according to setting in advance with the ability of AS#1, in the session ability information SDP3 of the IMS network support at the calling party place that AS#1 can be obtained and the message body that SDP4 joins session negotiation, and be provided with attribute information for session ability information SDP3 and SDP4.The description SDP3 and the SDP4 of other session ability informations of the IMS network support that AS#1 obtains, can be kept in advance on the AS#1, can obtain from other AS that participate in session, also can send the professional ability query requests to Capability Server#1, inquiry Capability Server#1 goes up the session ability information of the IMS network support of preservation, obtains the description SDP3 and the SDP4 of the session ability information of IMS network support in the message of being returned by CapabilityServer#1.CSCF#1 in the IMS network of calling party place is responsible for the session negotiation that AS#1 handled being forwarded on the IMS network of callee place description SDP1, SDP2, SDP3 and the SDP4 of the session ability information of session negotiation.

S-CSCF#2 on the IMS network of callee place is responsible for checking the session ability information of session negotiation, according to operator's local policy the description SDP5 of the session ability information of callee place IMS network support being joined session sets up in the request message, and SDP5 is provided with attribute information for session ability information, according to the content of session negotiation with forwards to the AS#2 of callee place IMS network.The local policy of operator can be to set in advance, and can be to judge according to the professional ability of network entity, can also be to judge in conjunction with setting in advance with the professional ability of network entity.The method that P-CSCF#2, S-CSCF#2 obtain the professional ability of IMS network support can be to send the professional ability inquiry to CapabilityServer#2, carries out next step operation behind the professional ability Query Result in receiving Capability Server#2 return messages.AS#2 on the IMS network at callee place can set up request message with session according to the local policy of operator and change, the local policy of operator, can be to set in advance, can be to judge according to the professional ability of network entity, can also be to judge in conjunction with setting in advance with the professional ability of network entity.In the description SDP6 of the session ability information of the IMS network support at the calling party place that AS#2 can be obtained and the message body that SDP7 joins session negotiation, and be provided with attribute information for session ability information SDP6 and SDP7.The description SDP6 and the SDP7 of other session ability informations of the IMS network support that AS#2 obtains, can be kept in advance on the AS#2, other AS that can participate in session from the IMS network at callee place obtain, also can send the professional ability query requests to the Capability Server#2 of the IMS at callee place network, inquiry Capability Server#2 goes up the professional ability of the IMS network support of preservation, obtains the description SDP6 and the SDP7 of the session ability information of IMS network support in the message of being returned by Capability Server#2.At this moment description SDP1, SDP2, SDP3, SDP4, SDP5, SDP6 and the SDP7 of the session ability information that carries in the request message set up in session.Session ability information can, be divided into a plurality of session ability information pieces according to the attribute of professional ability.

Description SDP2, SDP3, SDP4, SDP5, SDP6 and the SDP7 of the CSCF#2 of the IMS network at the CSCF#1 of the IMS network at calling party place and AS#1 and callee place and AS#2 session ability information in message body offer the callee and select.

S-CSCF#2 on the IMS network at callee place sets up request message with session and sends to the callee, the callee can set up the session ability information of request message and the description SDP1 of the session ability information that the selection of its professional ability is expected according to session, and carries the description SDP1 of the session ability information of its selection in the response message that returns.Network entity on the IMS network uses session service capability negotiation method of the present invention like this, the session ability information on Capability Server inquiry IMS network, thus finish the process of session negotiation.

MRF can be called by other network entities as the multimedia resource processing capacity entity of sharing in the IMS network, and MRF also can be used as SIP Proxy and the SIP B2BUA directly carries out Signalling exchange with calling and called side.Stipulate that MRF can directly carry out Signalling exchange with calling and called side in existing standard, MRF and calling and called side directly mutual scene mainly appear in the Ad-hoc meeting, and session and MRF that calling and called side adds MRF control require calling and called side to join in the session.Therefore, MRF also can revise session and set up professional ability in the request message in the session negotiation process.

In the present invention, network entity can also determine whether to carry out the setting of service media data route according to the situation that the entrained session ability information of conversation message is operated.

Determine whether that the setting up procedure that carries out service media data route is: network entity judges whether and can't operate the session ability information of the entrained terminal of conversation message, if, then carry out the setting of service media data route, be routed to media resource function MRF, the entrained session ability information of conversation message operated by MRF; Otherwise, then directly the entrained session ability information of conversation message is operated by network entity.

Method provided by the invention can also be applied in the PoC service, below lifts the application of specific embodiment explanation service capability negotiation in PoC service.

When in the IMS network, realizing PoC service, also can adopt method of the present invention to carry out service capability negotiation.The PoC server provides PoC service as AS for UE in the IMS platform, the PoC server, can be that PoC Server (Controlling) and PoC Server (Participating) are when receiving the service negotiation request message, here after being referred to as the INVITE request, the professional ability of adding the support of PoC server in the INVITE request offers the callee and selects.PoC Server (Controlling) can belong to same IMS network with PoC Server (Participating) also can belong to different IMS networks, PoC Server (Controlling) and PoC Server (Participating) can one the operation of content of description SDP that changes the session ability information of call request of PoC server also can successively all change the operation of content of description SDP of the session ability information of call request.After the callee receives the INVITE request, according to the professional ability of oneself, the professional ability of selecting SDP to describe, and in the 200OK response, carry the professional ability of describing among the SDP that has selected.After the PoC server is received the 200OK response that the callee sends, obtain the description SDP of the session ability information that the callee selects, judge whether to carry out the conversion of professional ability, carry out subsequent processing steps.

Fig. 4 for the present invention when the IMS network using PoC service, the signaling process figure of terminal carrying out service capability negotiation embodiment one, the entity that relates to comprises: calling terminal UE1, terminal called UE2, S-CSCF1 under the UE1 in the IMS network, S-CSCF2 under the UE2 in the IMS network, the control PoC service function (PoC Server (Controlling)) of administration UE1 and UE2 place group in this session, the participation control PoC service functional entity (PoC Server (Participating)) of administration UE2, suppose the description SDP of the session ability information that PoC Server (Controlling) storage is supported to some extent, its concrete steps are:

Step 400, UE1 send the PoC session request of setting up to S-CSCF1, i.e. INVITE request, and the session ability information SDP1 of UE1 has been carried in this request, can comprise attribute information.

Step 401, S-CSCF1 are handled by PoC Server (Controlling) according to definite this business of this INVITE request, and this INVITE request is transmitted to PoC Server (Controlling).

Step 402, PoC Server (Controlling) send the INVITE request of the attribute of description SDP1, the SDP2, SDP3 and the SDP4 that carry the session ability information that PoC Server (Controlling) supported and session ability information according to PoC service to S-CSCF1, wherein the professional ability support information comprises, the information of PoC Server (Controlling) belonging network, the information of mark P oC server, precedence information and other are used to identify the information of session ability information.

Step 403, S-CSCF1 send to S-CSCF2 with the INVITE request of receiving.

Step 404～405, S-CSCF2 send to the PoCServer (Participating) that administers UE2 with the INVITE request of receiving, PoC Server (Participating) returns and receives the INVITE request responding to S-CSCF2.

Step 406, S-CSCF2 send to UE2 with the INVITE request.

Description SDP1, SDP2, SDP3 and the SDP4 of the session ability information that step 407, the UE2 that receives INVITE request carry according to this request selects the SDP that self supports, as SDP4, return the 200OK response of the description SDP4 that carries session ability information to S-CSCF2.

The 200OK response that step 408～409, S-CSCF2 will carry the description SDP4 of session ability information sends to PoC Server (Participating), and PoC Server (Participating) returns the response that receives the 200OK response and gives S-CSCF2.

The 200OK response that step 410, S-CSCF2 will carry the description SDP4 of session ability information sends to S-CSCF1.

The 200OK response of the description SDP4 that carries session ability information that step 411, S-CSCF1 will receive is transmitted to PoC Server (Controlling).

The description SDP4 of the session ability information that step 412, PoC Server (Controlling) are carried the 200OK response and the description SDP1 of the session ability information that UE1 supports compare, judge whether both are identical, if, PoC Server (Controlling) determines that the data of transmitting between UE1 and the UE2 directly send to distant terminal by PoC Server (Controlling), execution in step 413; Otherwise PoC Server (Controlling) determines that the data of transmitting between UE1 and the UE2 carry out sending to distant terminal, execution in step 413 after the professional ability conversion.

Step 413～414, PoC Server (Controlling) send 200OK response by S-CSCF1 to UE1 according to the flow process of PoC service regulation and stipulation, and the service capability negotiation between this UE1 and the UE2 is finished.

Like this, use the interaction optimizing flow process of the service capability negotiation among the present invention, PoC Server (Controlling) has realized the PoC service capability negotiation process based on IMS.

Fig. 5 for the present invention when the IMS network using PoC service, the signaling process figure of terminal carrying out service capability negotiation embodiment two, the entity that relates to comprises: calling terminal UE1, terminal called UE2, S-CSCF1 under the UE1 in the IMS network, S-CSCF2 under the UE2 in the IMS network, the PoC Server (Controlling) of administration UE1 and UE2 place group in this session, the PoC Server (Participating) of administration UE2, suppose the SDP that PoC Server (Participating) storage is supported to some extent, session ability information has attribute information in the present embodiment, and the PoC server is handled session ability information according to attribute information.Its concrete steps are:

Step 500, UE1 send the PoC session request of setting up to S-CSCF1, i.e. INVITE request, and the description SDP1 of the session ability information of UE1 has been carried in this request.SDP1 can comprise attribute information, and attribute information has been described SDP1 and come from initiator's terminal, and priority is highest.Because UE1 sends out initiator's terminal, can stipulate that also SDP1 does not add attribute information.

Step 501, S-CSCF1 are handled by PoC Server (Controlling) according to definite this business of this INVITE request, and this INVITE request is transmitted to PoC Server (Controlling).In this process, P-CSCF and S-CSCF can check session ability information.

Step 502, PoC Server (Controlling) send to S-CSCF1 and receive this INVITE request responding.

Step 503, according to the PoC service standard, S-CSCF1 is according to the PoC service standard, and this INVITE request is sent to S-CSCF2.

Step 504, S-CSCF2 send to this INVITE request the PoC Server (Participating) of administration UE2.

Step 505, PoC Server (Participating) send the INVITE request of description SDP1, the SDP2, SDP3 and the SDP4 that carry the professional ability that PoC Server (Participating) supported to S-CSCF2.

Certainly, the description SDP of the description SDP of the session ability information supported of PoC Server (Participating) and the session ability information that PoC Server (Controlling) is supported can be inequality.

Step 506, S-CSCF2 send to UE2 with the INVITE request.

Description SDP1, SDP2, SDP3 and the SDP4 of the session ability information that step 507, the UE2 that receives INVITE request carry according to this request selects the SDP that self supports, as SDP4, the 200OK that returns the description SDP4 that carries session ability information to S-CSCF2 responds to S-CSCF2.

The 200OK response that step 508, S-CSCF2 will carry SDP4 sends to PoC Server (Participating).

The description SDP4 of the session ability information that step 509, PoC Server (Participating) are carried the 200OK response and the description SDP1 of the session ability information that UE1 supports compare, judge whether both are identical, if, PoC Server (Participating) determines that the data of transmitting between UE1 and the UE2 directly send to distant terminal by PoC Server (Controlling), execution in step 510; Otherwise PoC Server (Participating) determines that the data of transmitting between UE1 and the UE2 carry out sending to distant terminal, execution in step 510 after the professional ability conversion.

Step 510, PoC Server (Participating) return the response that receives the 200OK response and give S-CSCF2.

Step 511, S-CSCF2 send to S-CSCF1 with the 200OK response.

Step 512, S-CSCF1 are transmitted to PoC Server (Controlling) with the 200OK response.

Step 513～514, PoC Server (Controlling) send 200OK response by S-CSCF1 to UE1 according to the flow process of PoC service regulation and stipulation, and the service capability negotiation between this UE1 and the UE2 is finished.

Like this, use the interaction optimizing flow process of the service capability negotiation among the present invention, PoC Server (Participating) has realized the PoC service capability negotiation process based on IMS.

PoC Server (Controlling) and PoC Server (Participating) belong to the AS of control PoC service place network and the AS of calling and called terminal place network respectively.It should be noted that PoCServer (Controlling) and PoC Server (Participating) after receiving INVITE, all the description SDP of the session ability information of its place network support can be joined and offer terminal called in the INVITE request and select.When PoC Server (Controlling) and PoC Server (Participating) add session ability information, attribute information that can the descriptive session ability information, PoC Server (Controlling) can add the attribute of session ability information for belonging to sponsor network and control meeting telephone network, and priority is lower than the session ability information of terminal.PoC Server (Participating) can add the attribute of session ability information for belonging to callee's network, can be higher than or be lower than the priority of the session ability information of PoC Server (Controlling) interpolation according to the priority that session ability information is set.After the PoC server is received a conversation request message of carrying a plurality of session ability informations and a plurality of attribute informations, can at first check the attribute information of a plurality of session ability informations, according to the network information and other information of precedence information, ownership, from a plurality of session ability informations, select one of them or a plurality of session ability information.In one or more session ability information of selecting, select the parameter of corresponding descriptive session ability information.

Below lift several specific embodiments method provided by the invention is described.

The professional ability conversion schematic diagram that Fig. 6 provides terminal called to support for the server in the IMS network of the present invention jointly, as shown in the figure: the session between UE1 and the UE2 is set up by the AS of IMS network, AS can be according to providing professional type and the professional ability that self provides to determine whether that the needs server provides the professional ability support, if, then the transfer of data between UE1 and the UE2 is carried out professional ability conversion back transmission by AS and server respectively.

This shows, the professional ability conversion that the data of transmitting between UE1 of the present invention and the UE2 carry out sending in the other side's process after the professional ability conversion can independently be finished by AS, also can authorize in the IMS network other to have the entity of professional ability translation function to finish, can also have the entity of professional ability translation function to finish jointly by in AS and the IMS network other by AS.

Illustrate, during SDP that the description SDP of the inequality and selected session ability information of callee of the description SDP of the session ability information of supporting as the description SDP of the selected session ability information of callee and calling party supports for other servers, then provide the professional ability of data that transmit calling and called side to change by other servers; As the description SDP of the session ability information that the description SDP of the selected session ability information of callee and calling party support among the inequality and selected SDP of callee, the description SDP that the session ability information of AS support is arranged, when the description SDP of the session ability information that other servers support is also arranged, then provide the professional ability of data that transmit calling and called side to change jointly by AS and other servers.

Below specific embodiment of act illustrates finally and provides professional transfer capability ground service capability negotiation process jointly by other servers and AS.Fig. 7 carries out the flow chart of the signaling embodiment of service capability negotiation in the IMS network for terminal of the present invention, the network entity that relates to comprises: S-CSCF2, the AS in the IMS network under S-CSCF1, the UE2 in the IMS network under the UE1 in calling terminal UE1, terminal called UE2, the IMS network, provide the CapabilityServer of IMS network institute supporting business ability, its concrete steps are:

Step 700, UE1 consult to the S-CSCF1 initiation session, i.e. INVITE request, and the description SDP1 of the session ability information of UE1 is carried in this request, comprises the parameter about professional ability such as professional ability type, media parameter and coding parameter among the SDP1.

Step 701, S-CSCF1 return to UE1 and receive this INVITE request responding, i.e. 100Trying message.

For each INVITE request, the response of a 100Trying message all can be arranged, the present invention does not identify in following flow process.

Step 702, S-CSCF1 are transmitted to AS according to the AS that this INVITE asks to determine to provide the service capability negotiation function with this INVITE request.

Step 703, AS send the professional ability query requests to Capability Server.

Step 704, Capability Server return the response of professional ability query requests to AS, and the description SDP of the session ability information of IMS network support, for example SDP1, SDP2, SDP3 and SDP4 are carried in this response.

Wherein, SDP1 and SDP2 are the description of the professional ability of AS support, and SDP1, SDP2, SDP3 and SDP4 are the description of the professional ability of other servers supports.

Step 705, AS send the INVITE request of description SDP1, the SDP2, SDP3 and the SDP4 that carry professional ability to S-CSCF1.

Step 706～707, S-CSCF1 send to UE2 with the INVITE request of receiving by S-CSCF2.

Description SDP1, SDP2, SDP3 and the SDP4 of the session ability information that step 708～709, the UE2 that receives INVITE request carry according to this request selects the professional ability self supported, as SDP4 and SDP2, return to the 200OK response that S-CSCF1 carries SDP4 and SDP2 by S-CSCF2.

Wherein, the professional ability that selected SDP4 describes is the professional ability that application server is supported, the professional ability that selected SDP2 describes is the professional ability that AS supports.

Description SDP4 that carries professional ability that step 710, S-CSCF1 will receive and the 200OK of SDP2 response are transmitted to AS.

The SDP1 that the description SDP4 of the session ability information that step 711, AS are carried the 200OK response and SDP2 and UE1 support compares, judge whether both are identical, if, AS determines that the data of transmitting between UE1 and the UE2 directly send to distant terminal by AS and application server, execution in step 712; If not, determine that the data of transmitting between UE1 and the UE2 carry out sending to distant terminal after the professional ability conversion, promptly carry out jointly sending to distant terminal, execution in step 712 after the professional ability conversion through AS and other servers.

Step 712～713, AS send the 200OK response by S-CSCF1 to UE1, and the service capability negotiation between this UE1 and the UE2 is finished.

Below lift a specific embodiment and illustrate that SIP network of network entity is set up request message to the session that is used for session foundation and the operation that response message increases, deletes or/and revises is set up in session, to realize session ability information operation of the present invention.

Fig. 8 carries out the flow chart of the signaling embodiment two of service capability negotiation in the IMS network for the present invention.The network entity that relates to comprises: the processing entities 1 in the network entity 1 in the SIP network under calling terminal UE1, terminal called UE2, the UE1, the network entity 2 under the UE2, the SIP network under the UE1, the processing entities 2 in the SIP network under the UE2.In the present embodiment, processing entities 1 and processing entities 2 are set up the session ability information that request message and session set up in the message body of response message to session respectively and have been carried out increase, deletion and modification, have realized the session negotiation process.Wherein processing entities can be a network entity independently, also can be that a logic function is integrated on the network entity, and network entity can be AS, CSCF, MRF, SIP-ALG etc.Its concrete steps are:

Step 800, UE1 send the INVITE request message to network entity 1, have carried the session ability information of UE1 in the request message.

Step 801, network entity 1 are transmitted to processing entities 1 with the INVITE request message.

Session ability information in the message body of step 802～803, processing entities 1 inspection INVITE request message, and after having added the session ability information of UE1 place SIP network support, the INVITE request message is sent to network entity 1.

Step 804, network entity 1 send the INVITE request message to processing entities 2.

Step 805～806, processing entities 2, session ability information in the message body of inspection INVITE request message, the unsupported session ability information of SIP network under the deletion UE2, add the session ability information of the affiliated SIP network support of UE2, after can also revising the session ability information in the message body of INVITE request message, the INVITE request message is sent to network entity 2.

Step 807, network entity 2 are transmitted to UE2 with the INVITE request message.

Step 808～809, UE2 receive the INVITE request message, session ability information in the message body of inspection INVITE request message, after selecting the session ability information of UE2 support, response message is set up in the session of carrying the session ability information of UE2 support sent to network entity 2.

The session that step 810, network entity 2 will carry the session ability information that UE2 supports is set up the response message response and is sent to processing entities 2.

The session ability information in the response message is set up in step 811, processing entities 2 inspection sessions, increases, deletes or/and the session ability information in the response message is set up in the modification session according to predefined strategy.

Step 812, processing entities 2 are set up response message with session and are sent to processing entities 1.

Step 813～814, processing entities 1 increase, deletion is or/and after revising session and setting up session ability information in the response message, set up response message with session and send to network entity 1.

Step 815, network entity 1 send response message to UE1, and the process of service capability negotiation is finished.

The machinery of consultation of professional ability provided by the invention can be not limited to the network of its use, promptly, but being used on the functional entity in the network at calling party place, can be CSCF, AS, MRF and SIP-ALG, can be above network entity is not limited to these network entities; The SIP network that also can be used for the callee place.The machinery of consultation of professional ability of the present invention can be used simultaneously at the business network at calling party and callee place, also can use respectively, in addition, in some applications, does not distinguish calling and called side's network, also can use the method for this service capability negotiation.

The present invention carries out in the service capability negotiation process in calling and called side, when request message is set up in the session of sending the professional ability of carrying the calling party to the SIP network as the calling party, network entity in the SIP network can directly be changed session and set up content in the request message, the information of the professional ability of the SIP network support of its acquisition is carried in this request message sends to the callee, select after the professional ability of its support to set up response message by the callee and send to network entity in the SIP network by session, network entity in the SIP network carries out subsequent treatment according to the professional ability that the callee that accepted supports, the network entity in the SIP network can also increase the professional ability that response message is set up in session, deletion and modification.Because calling terminal of the present invention also waits until that unlike prior art terminal called returns the negotiation of just carrying out professional ability between the calling and called terminal after the refuse information again, but directly provide the session ability information of SIP network to select for terminal called, thereby simplified the process of calling and called terminal carrying out service capability negotiation, reduced the time delay that session is set up.

It is as described below how to carry business support ability information in conversation message.

Session ability information can use the SDP protocol description, and promptly conversation message adopts SDP.The present invention can divide the session ability information that carries in the session message a plurality of session ability information pieces, SDP has increased the definition of numbering and attribute to the session ability information piece, make the entrained a plurality of session ability information pieces of conversation message to be identified, and can determine to select which session ability information piece to handle according to the numbering and the attribute of session ability information piece.

Session ability information piece number-mark, for example this number definition is Series or is defined as SDP ID etc., uses the numbering of series as the session ability information piece.Numbering can allow a plurality of session ability information pieces in the message body of same conversation message can be distinguished each other.Behind the version information of the session ability information piece of SDP definition, use number-mark, the method for sign can for:

In the v field of the version information of session ability information piece, increase numbering.As: v=0 series:＜seriesnumber from 0-n 〉.

Concrete using method is: if current session ability information piece is the 3rd a session ability information piece in the current sessions message, so this session ability information piece is identified.The sequence number definition is from 0-n, do not support in the present invention to comprise in the message body of a conversation message more than n different session ability information piece, do not wish that in the present invention a conversation message is excessive, therefore wish that the session ability information piece in the message body of a conversation message can not surpass a scope, such as not surpassing n=10, can certainly determine the scope of numbering according to the disposal ability of SIP network.

The present invention is provided with end mark information can for the session ability information piece: owing to can comprise a plurality of session ability information pieces in the message body of conversation message, therefore need make SIP network of network entity can discern the end mark information of session ability information piece in the end mark information of the last increase session ability information piece of each session ability information piece.End mark information is defined as the end mark of a complete session ability information piece, and in a single day SIP network of network entity finds end mark, just can judge that a session ability information piece is through with.The present invention can adopt the f=finished mode to define the end mark of session ability information piece.

The present invention is provided with opening flag information can also for the session ability information piece, and opening flag information can be first character string V=of session ability information BOB(beginning of block), also can be the opening flag of session ability information piece.

It is as follows that the present invention has the form of conversation message of a complete session ability information piece:

v＝0?series：3

o＝mhandley?28908445262890842807?IN?IP4?126.16.64.4

s＝SDP?Seminar

i＝A?Seminar?on?the?session?description?protocol

u＝http://www.cs.ucl.ac.uk/staff/M.Handley/sdp.03.ps

e＝mjh@isi.edu(Mark?Handley)

c＝IN?IP?4?224.2.17.12/127

t＝28733974962873404696

a＝recvonly

m＝audio?49170?RTP/AVP?0

m＝video?51372?RTP/AVP?31

m＝application?32416?udp?wb

a＝orient：portrait

f＝finished

Embodiment 1, and the present invention is defined as follows described to the message body content in the conversation message.

The present invention increases the definition to the message body contents attribute newly in the message header of conversation message, the message body content attribute description contents attribute of message body content of conversation message, the message body content attribute is offered network entity, session initiator or/and message receiver.The description of message body content attribute can have a plurality of, the description correspondence of a plurality of contents attributes the session ability information piece in the message body of conversation message, network entity can determine all to carry in the message body of conversation message the attribute and the priority level of which session ability information piece, these session ability information pieces by the message content attribute in the message header of conversation message.The present invention to the definition of the message body content attribute of conversation message in the following way, the message header that has defined conversation message is Content, and the Content field is defined as follows:

Content：series1：<belong<which?network?belong?to>|entity<which?entitybelong?to>|priority<value>

Content：series2：<belong<which?network?belong?to>|entity<which?entitybelong?to>|priority<value>

Content：series3：<belong<which?network?belong?to>|entity<which?entitybelong?to>|priority<value>

Wherein, message header Content represent in this field will message body to conversation message in entrained session ability information piece be described.Series[x] represented the numbering of session ability information piece, at each series[x] after, all need to comprise the description ownership attribute of media information of ownership attribute, priority and this session ability information piece of this session ability information piece.

Which network entity ownership attribute-bit this session ability information piece belongs to, the ownership attribute of session ability information piece be terminal, session initiator, network calling terminal place network, place, session control side or/and terminal called place network.Used following define method in the present invention:

The ownership attribute of definition session ability information piece, promptly Belong is that endpoint, originationnetwork, focus network are or/and termination network.

The description ownership attribute of the media information of session ability information piece, be that Entity has stipulated which network entity the description of media information belongs to, can belong to AS, Session Controller, as PoC CF, Conference Server etc. are or/and resouce controller, as MRF, media gateway etc.Used following define method in the present invention:

Definition Entity is that Application Server, Session Controller are or/and ResourceController.

The priority deterministic process of session ability information piece is as described below.

In the message body content attribute that in the message header of conversation message, is provided with, can comprise priority.Because the callee determines the session ability information piece and belongs to which network and belong to which network entity, by analysis session ability information piece, just can judge the priority of a plurality of session ability information pieces in the conversation message body, and the priority of each session ability information piece is arranged in the message body content attribute in the message header of conversation message.

The present invention also defines the content-length in the message body of conversation message.

After the attribute description to the session ability information piece in the message body in the conversation message finishes, should identify the session ability information piece, the method for sign is: decimally number is added up byte number.Concrete definition is, is 518 bytes as a session ability information block length, and length is defined as so: Content-length:518.

The concrete grammar that the present invention expands the message header of conversation message is as described below.

The message header of conversation message of the present invention has carried out the contents attribute setting to the content part in the message body of conversation message, thereby has expanded message header.The method of expansion is, every increase session ability information piece or other message body content in the message body of conversation message, will in the message header of conversation message, increase the description Content field of message body content attribute, and in the Content field, the type of this part message body content, form, content-length etc. will be described.Like this, all session ability information pieces or message body content in the message body of conversation message all are provided with contents attribute in the message header of conversation message, contents attribute has defined the type of the numbering of session ability information piece or message body content, affiliated network or terminal, affiliated which kind of network entity, option priority, content, as SDP, picture or audio frequency etc., coded format or/and message body content length etc.

Exist the form of message header of complete conversation message of a plurality of session ability information pieces and message body content as described below in conversation message:

Content：series：0<belong：endpoint|entity：|priority：0>

Content-type：Application/SDP

c：text/html；charset＝ISO-8859-4

Content-length：333

Content：series：1<belong：endpoint|entity：|priority：0>

Content-type：Image/jpeg

Content-length：1024

Content：series：2<belong：origination?network|entity：MRFx|priority：1|

Content-type：Application/SDP

Content-length：412

Content：series：3<belong：focus?network|entity：controller|priority：0|

Content-type：Application/SDP

Content-length：388

Wherein, first message body content that this conversation message carries is the desired session ability information piece of calling party, second message body content is that the calling party has added individual photo in conversation message, the session ability information piece that the SIP network that the 3rd message body content is the calling party place provides; The 4th message body content is the session ability information piece that place, session control side network provides.After the callee receives conversation message like this, just can obtain the message body content that calling party and network entity add in conversation message.From these message body content, the callee selects the message body content supported, and can continue to handle other steps of relevant conversation message.

Embodiment 2, increased the definition to the message body type in the message body of conversation message, expanded the message body content attribute of conversation message, and remainder is identical with embodiment 1.

In the Content-type field of the message header of conversation message, can use existing message body content type, i.e. Content-type:Application/MIME.

The using method of message body content attribute in conversation message that comprises the message body type is as described below.

Can comprise a plurality of session ability information pieces in the message body of conversation message, the type of the sign of the Content-type in the message header of conversation message should be Content-type:Application/MIME so.

Below the Content-type field, should each the session ability information piece in the message body of conversation message be described, need accomplish the every session ability information piece all useful Content-type field description message body type in message header in the message body of conversation message.

The form of the message header of a conversation message that has comprised 4 session ability information pieces is as follows:

Content-type：Application/MIME

Content：series1：<belong：endpoint|entity：|priority：0

Content：series2：<belong：origination?network|entity：session?controller|priority：

Content：series3：<belong：focus?network|entity：application?server|priority

Content：series3：<belong：focus?network|entity：resource?controller|priority

The callee to the use of the message body type in the message header of conversation message is: carried Content-type=Application/MIME in the callee receives message header at conversation message, represented so to carry a plurality of complete session ability information pieces in the message body of the conversation message that the callee receives.The callee need check the content of Content field in the message header of conversation message, and according to the contents attribute of each session ability information piece in the Content field, determines at which session ability information piece to select the media parameter of callee's expectation.

In embodiment 2, the content in the message body of conversation message comprises:

v＝0 series：1

o＝caller?2890844526?2890842807?IN?IP4?126.16.64.4

s＝SDP?Seminar

i＝A?Seminar?on?the?session?description?protocol

u＝http://www.huawei.com

e＝caller@huawei.com(Caller)

c＝IN?IP4?10.1.1.10/127

t＝2873397496?2873404696

a＝sendrecv

m＝audio?49170?RTP/AVP?0

m＝video?51372?RTP/AVP?31

m＝application?XXXXX?XXX?XX

a＝orient：portrait

f＝finished

v＝0 series：2

o＝caller?2890844526?2890842807

s＝SDP?Seminar

i＝A?Seminar?on?the?session?description?protocol

u＝http://www.huawei.com

e＝caller@huawei.com(caller)

c＝IN?IP4?11.1.1.10/127

t＝2873397496?2873404696

a＝sendrecv

m＝audio?XXXX?RTP/AVP?0

m＝video?XXXX?RTP/AVP?31

m＝application?32416?udp?wb

a＝orient：portrait

f＝finished

v＝0 series：3

o＝caller?2890844526?2890842807

s＝SDP?Seminar

i＝A?Seminar?on?the?session?description?protocol

u＝http://www.huawei.com

e＝caller@huawei.com(caller)

c＝IN?IP4?192.168.1.10/127

t＝2873397496?2873404696

a＝sendrecv

m＝audio?XXXX?RTP/AVP?0

m＝video?XXXX?RTP/AVP?31

m＝application?XXXXX?XXX?XX

a＝orient：portrait

f＝finished

v＝0 series：4

o＝caller?2890844526?2890842807

s＝SDP?Seminar

i＝A?Seminar?on?the?session?description?protocol

u＝http://www.huawei.com

e＝caller@huawei.com(caller)

c＝IN?IP4?193.168.1.10/127

t＝2873397496?2873404696

a＝sendrecv

m＝audio?XXXX?RTP/AVP?0

m＝video?XXXX?RTP/AVP?31

m＝application?XXXXX?XXX?XX

a＝orient：portrait

f＝finished

Embodiment 3, a plurality of media parameter can appear in a session ability information piece, therefore, in the session ability information piece that conversation message carries, increased description to media parameter attribute and precedence information, can obtain this media parameter according to the description of media parameter attribute and belong to which class network entity or terminal, according to the precedence information of media parameter, determine the priority level of media parameter.Like this, the callee of conversation message can obtain the business attribute information of medium by checking the media parameter attribute, can the effective choice media parameter.

The media parameter of session ability information piece comprises three classes: the first kind belongs to session information, comprises session identification and other session level parameters, as session initiator's IP address, theme, session or founder's contact details etc.; Second class belongs to regularly descriptor, comprises start and stop time, number of repetition and one and the description of a plurality of media-level; The 3rd class belongs to medium type and format description information, comprises host-host protocol and transport address, as type, type of coding and other media parameter of IP address and port numbers, medium.

The present invention has increased the definition of media parameter ownership attribute and priority in the media parameter of session ability information piece is described, and provides the callee how according to the ownership attribute of media parameter and the method for priority selection media parameter.

The present invention will add from a plurality of media parameter of heterogeneous networks and network entity in the session ability information piece, in order to allow the callee can discern these network entities, need the description with media parameter distinguish in different media parameter.The description of media parameter can be media parameter belong to which network in the session negotiation process, media parameter belongs to priority parameters which kind of network entity, that network entity or callee add or/and the description of other attributes.

The callee receives the description of the media parameter in the message body of conversation message, comprised media parameter belong to which network in the session negotiation process, media parameter belongs to priority parameters which kind of network entity, that network entity or recipient add or/and the description of other attributes, the callee uses the description of these media parameter can select the media parameter of this session negotiation.

The form of the message body of conversation message is as follows.

v＝(protocol?version)

o＝(owner/creator?and?session?identifier).

s＝(session?name)

i＝*(session?information)

u＝*(URI?of?description)

e＝*(email?address)

p＝*(phone?number)

c＝*(connection?information-not?required?if?included?in?all?media)

b＝*(bandwidth?information)

One?or?more?time?descriptions(see?below)

z＝*(time?zone?adjustments)

k＝*(encryption?key)

a＝*(zero?or?more?session?attribute?lines)

Zero?or?more?media?descriptions(see?below)

Regularly the parameter of level definition is:

t＝(time?the?session?is?active)

r＝*(zero?or?more?repeat?times)

The parameter of media-level definition is:

m＝(media?name?and?transport?address)

i＝*(media?title)

c＝*(connection?information-optional?if?included?at?session-level)

b＝*(bandwidth?information)

k＝*(encryption?key)

a＝*(zero?or?more?media?attribute?lines

Concrete implication about the media parameter of session ability information piece can be with reference to RFC 2327 standards.

In the media-level parametric description, the present invention uses a parameter, has increased media parameter ownership attribute, media parameter type and media parameter priority definition.

Media parameter ownership attribute definition is the network entity or the terminal at this media parameter place.The form of definition is:

a*＝belong：<value＝which?entity?belong?to>

Wherein, belong can be for the network at the network at the terminal point of session, session initiator place, message receiver place or/and the network at controlling party place etc., concrete definition can be that endpoint, originationnetwork, termination network are or/and focus network.Wherein endpoint is expressed as the media parameter that the calling party provides; Origination network represents the media parameter that calling party place network provides; Termination network represents the media parameter that callee place network provides; The media parameter that focus network sign place, session control side network provides.

The media parameter priority attribute is defined as the priority level ordering of media parameter that network provides, and illustrates, and the more little priority of numeral is high more between the regulation 0-n.The form of regulation can be:

a*＝priority：<value＝priority?property?from?0?to?n>

Priority is the value from 0-n.On behalf of this media parameter, parameter 0 belong to provide the preferential class media parameter of supporting of professional institute, and belongs to the most frequently used media parameter, and the media parameter of parameter 0 can be one or more, is the media parameter of network entity recommendation.Parameter 1 representative, except the media parameter of recommending, other media parameter that network provides.

A plurality of media parameter of it should be noted that the session ability information piece can be regarded as the interior a plurality of media parameter of a group.Because in the RFC 3388 that describes media parameter grouping definition, the group of acquiescence is unique in the session ability information piece, so expand on this basis, makes to comprise a plurality of media parameter groups in the session ability information piece.

When comprising a plurality of media parameter group in the session ability information piece, media parameter ownership attribute and priority attribute can be that the unit defines with the media parameter group.Can be at a=group:＜next line just add media parameter group ownership attribute and priority attribute.As:

a＝group：LS?12

a＝belong：<>

a＝priority：<>

m＝audio?30000?RTP/AVP?0

a＝mid：1

m＝video?30002?RTP/AVP?31

a＝mid：2

m＝audio?30004?RTP/AVP?0

i＝This?media?stream?contains?the?Spanish?translation

a＝mid：3

Medium ownership attribute and the using method of priority of calling party in the message body of conversation message is as described below.

The calling party is the promoter of session, send in the session ability information piece that session sets up request message at network to its place, carried the media parameter of session initiator's expectation, in media parameter, except normal media parameter attribute, also comprised media parameter ownership attribute (a=belong:endpoint), because the media parameter that the session ability information piece carries has only one or one group, so do not need to carry priority attribute.

Network side is as described below to the using method of ownership attribute of the media parameter in the message body of conversation message and priority.

Network side adds media parameter ownership attribute and priority attribute can be divided into three part execution, promptly adds at the network at calling party place, the network at controlling party place and the network at callee place respectively.This three subnetwork can add the media parameter of place network support respectively, the also media parameter that can provide this network to support by some networks, and the schematic diagram of network is as shown in Figure 6.

After the network at calling party place receives that request message is set up in session, handle according to the content that the normal flow of IMS standard is set up in the request message session, the professional ability that calling party place network can be supported joins session and sets up in the request message in addition.At this moment the session ability information piece that request message is set up in session has been added into a plurality of or many group medias parameter, and session initiator place network need be provided with media parameter ownership attribute and priority attribute for a plurality of or many group medias parameter.

At this moment, comprise the calling party media parameter in the session ability information piece, increased a=belong:endpoint and a=priority:0; Media parameter a=belong:origination network and a=priority:0 that one or more calling partys place network is recommended have been comprised; The media parameter a=belong:origination network and the a=priority:1 that have comprised one or more calling partys place network support.

Calling party place network is handled session according to the normal flow of IMS standard and is set up request message.

After the network at professional controlling party place receives that request message is set up in session, handle according to the content that the normal flow of IMS standard is set up in the request message session, the professional ability that professional controlling party place network can be supported joins in the session foundation request in addition.At this moment the session ability information piece that request message is set up in session has been added into a plurality of or many group medias parameter, and controlling party place network need be provided with media parameter ownership attribute and priority attribute for a plurality of or many group medias parameter that adds.

At this moment, comprised media parameter a=belong:focus network and the a=priority:0 that one or more controlling parties place network is recommended in the session ability information piece; The media parameter a=belong:focus network and the a=priority:1 that have comprised the place network support of one or more controlling parties.Need to prove, under a part of application scenarios such as PoC service, the network at the network at calling party place and controlling party place can be same network, promptly the network at PoC server (Controlling) place be the network at calling party place be again the network at controlling party place.

Controlling party place network is handled session according to the normal flow of IMS standard and is set up request message.

After the network at callee place receives that request is set up in session, handle according to the content that the normal flow of IMS standard is set up in the request session, the professional ability that callee place network can be supported joins in the session foundation request in addition.At this moment the SDP description that request is set up in session has been added into a plurality of or many group medias parameter, and message receiver place network need be provided with media parameter ownership attribute and priority attribute for a plurality of or many group medias parameter.Because the judgement of priority is made on AS, and other network entities can't be determined the priority of current media parameter, so can think that the standard of the priority that AS judges is unified and can not clashes.

At this moment, comprised media parameter a=belong:termination network and the a=priority:0 that one or more callees place network is recommended in the session ability information piece; The media parameter a=belong:termination network and the a=priority:1 that have comprised one or more callees place network support.

Callee place network is handled session according to the normal flow of IMS standard and is set up request message.

The process that adds the media parameter of network side support in call setup request message can be selectable, and the network at the network at calling party place, controlling party place and the network at callee place all can select whether to add the media parameter that present networks is supported.Judging whether to add the condition of present networks institute support media parameter, can be business need etc.

The processing procedure that AS sets up the session ability information piece in the request message to session is as described below.

AS is as the Business Processing network entity in the IMS network, can in the IMS network, be responsible for the media parameter that inquiry IMS network is supported, and set up the media parameter that adds inquiry in the request in session, at this moment need in the media parameter that adds, add media parameter ownership attribute and priority parameters for these media parameter.

Before AS inquired the media parameter that the IMS network supported, these media parameter were kept on the network entity on the IMS platform, and media parameter did not need to carry parameter ownership attribute and priority parameters before sending to AS.After the media parameter that obtains to support on the IMS network at AS, the business that will provide according to AS is respectively the priority attribute of the media parameter interpolation media parameter of acquisition.AS determines that the method for media parameter priority attribute can be definite according to the description of the media parameter attribute in the message body of session negotiation message.

Entity in the SIP network is except the session ability information of session being set up request message and carrying is made amendment, can also edit or additions and deletions the application information that this request message carries, application information comprises contents such as the tinkle of bells, picture, message, video, executive program.The callee can carry out or delete these application informations according to being provided with of callee after receiving this request message.

The message body that Fig. 9 sets up in the request message to session for the network entity in the SIP network of the present invention increases the tinkle of bells and the signaling process figure that revises the tinkle of bells, the entity that relates to comprises: calling terminal UE1, terminal called UE2, S-CSCF#1 in the SIP network under the UE1 in the SIP network, S-CSCF#2 in the SIP network under the UE2, AS#1 under the UE1 in the SIP network, AS#2 under the UE2 in the SIP network, suppose that AS#1 stores the tinkle of bells playing program Sound#1 that supports in the SIP network of UE1 place, the tinkle of bells playing program Sound#2 that supports in the SIP network of AS#2 storage UE2 place, its concrete steps are:

Step 900, UE1 send session to S-CSCF#1 and set up request message, i.e. INVITE request, and the session ability information of UE1 has been carried in this request, and UE1 can also add the tinkle of bells playing program Sound in the message body of this request message.

Step 901, S-CSCF#1 are handled by AS#1 according to definite this business of this INVITE request, and this INVITE request is transmitted to AS#1.

Whether step 902, AS#1 increase, revise or delete the tinkle of bells playing program Sound that preserves of SIP network support according to the strategy decision of operator on AS#1 in the message body of conversation message.If the strategy of operator requires AS#1 to add the tinkle of bells playing program Sound#1, and deletes original the tinkle of bells playing program Sound, AS#1 sends the INVITE request of carrying Sound#1 to S-CSCF#1.

Step 903, S-CSCF#1 send to S-CSCF#2 with the INVITE request of receiving.

Step 904～905, S-CSCF#2 send to AS#2 with the INVITE request of receiving, AS#2 can select whether to increase, change or delete the content in the message body of conversation request message according to the strategy of operator, return and receive the INVITE request responding, at this moment can comprise Sound#1 and/or Sound#2 in the message body of conversation request message to S-CSCF#2.

Step 906, S-CSCF#2 send to UE2 with the INVITE request.

Step 907～908, receive the tinkle of bells playing program that the UE2 of INVITE request carries according to this request, except session negotiation, also play the tinkle of bells to the user who uses UE2.At this moment, UE2 returns other operating procedures that 200OK responds the guild's words negotiations process of going forward side by side to S-CSCF#2.

In such session negotiation process, AS#1 and AS#2 according to the strategy modification of operator session set up the content of the message body of request message, can increase, revise or delete the tinkle of bells playing program Sound in the message body of this request message, except the session negotiation mechanism that provides in the request message is provided in session, also provide other application informations.

Network entity from additions and deletions application information to session that set up the message body inediting of request message or can be one or more among S-CSCF, P-CSCF, AS, the MRF, is not limited to above network entity.The application information of network entity editor or additions and deletions application information can comprise the tinkle of bells, picture, message, video, executive program content, but is not limited to these contents.The process of network entity editor or additions and deletions application information can be carried out simultaneously with the process of session negotiation, does not influence the process of service capability negotiation.

Figure 10 sets up the signaling process figure that message body in the request message increases the description of the media information of supporting video type for the network entity in the SIP network of the present invention to session, the network entity that relates to is: the AS#2 under AS#1 under session initiator terminal UE 1, the session side of access terminal UE 2, the UE1 in the SIP network and the UE2 in the SIP network, and its concrete steps are:

Step 1000, UE1 send session to AS#1 and set up request message, because UE1 only supports audio frequency, so the description of setting up the media information that only carries the audio media type that UE1 supports in the message in conversation request.

After step 1001～1003, AS#1 receive that request message is set up in session, after the description of the media information of the video media type that interpolation AS#1 supports in this message, by AS#2 request message is set up in session and sent to UE2.

AS#1 can also set up the description of giving each media information in the request message in session increases priority level and attribute information, offers UE2 as a reference.

After step 1004, UE2 receive that request message is set up in session,, will select session to set up audio and video medium type in the description of the media information that request message carries, the result who sets up as this session because UE2 supports Voice ﹠ Video.

Increase priority level and attribute information because AS#1 sets up the description of giving each media information in the request message in session, so at first UE2 can determine that UE1 only supports audio frequency, UE2 must select audio media type; UE2 can determine that AS#2 supports video then, and UE2 selects video media type, can set up video communication between AS#2 and the AS#1.

If also have the terminal of other AS#1 belonging network of supporting video administration to add this session, just can carry out having communicated by letter of Voice ﹠ Video with AS#1 with UE2 by AS#2.

Step 1005～1006, UE2 return 200OK message by AS#2, and this message is carried the description of the media information of the audio and video medium type that UE2 selects.

After step 1007, AS#1 receive 200OK message, determine that UE2 has selected the medium type of audio and video medium type as this session, AS#1 sets up being connected of audio media type between AS#1 and UE1, at AS#1 through AS#2 to the connection of setting up the audio and video medium type between the UE2, return 200OK message to UE1, this message is carried the description of the media information of the audio media type that UE1 supports.

In the described method of Figure 10, return to the description that also can carry or not carry the media information of the selected audio and video medium type of UE2 in the 200OK message of UE1 at AS#1, when carrying, UE1 can determine the medium type of this session, if do not carry, do not influence UE1 yet and in this session, audio frequency is used as medium type.

In order to realize the operation to session ability information, the present invention has also increased the session ability information operated system, and as shown in figure 11, the terminal in the SIP network connects by the one or more network entity that the present invention is provided with.

Terminal in the SIP network can be recipient or transmit leg.

Figure 12 is the structural representation of the network entity that the present invention is provided with, and this network entity comprises: the receiver module 120 of Lian Jieing, tactful acquisition module 121 and processing module 122, respond module 123 that is connected with processing module 122 and forwarding module 124 respectively successively; Wherein, receiver module 120, respond module 123 and forwarding module 124 also are connected with each terminal in the SIP network.

Terminal, the transmit leg that is conversation message sends to receiver module 120 with session message, after strategy acquisition module 121 gets access to the strategy of handling conversation message, the strategy that the conversation message that receiver module 120 is received is transparent to processing module 122 and will handles conversation message sends to processing module 122, after processing module 122 adopts the strategy of handling conversation message that conversation message is handled, the generation session is set up request message and is sent to forwarding module 124, perhaps generating session sets up response message and sends to respond module 123, forwarding module 124 is set up request message with session and is sent terminal, respond module 123 is set up response message with session and is sent to corresponding terminal, the i.e. recipient of conversation message.

Network entity of the present invention comprises that also Capability Provide Function is connected with tactful acquisition module, is used for the strategy of stores processor conversation message, and the strategy of the processing conversation message stored is sent to tactful acquisition module.This Capability Provide Function can also not be arranged in network entity, and independent the existence.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1, a kind of session ability information method of operating of carrying out is characterized in that this method comprises:

2, the method for claim 1, it is characterized in that described conversation message is that session is set up request message, session and set up that response message, session are set up negotiation message, session is set up and consulted acknowledge message, session updates message or session updates acknowledge message.

3, method as claimed in claim 2 is characterized in that, it is INVITE or REFER message that request message is set up in described session; It is 200OK message that response message is set up in described session; It is 183 message that negotiation message is set up in described session; Described session is set up and consulted acknowledge message is PRACK message; Described session updates message is UPDATE message or REINVITE message; Described session updates acknowledge message is a 200OK message.

4, the method for claim 1 is characterized in that, described session ability information is Session Description Protocol SDP, application program, positional information or presents presence information;

5, the method for claim 1 is characterized in that, described increase operating process is:

6, method as claimed in claim 5, it is characterized in that, the session ability information of described SIP network support or/and the acquisition process of configuration information be: provide store session ability information among the function Capability Provide Function or/and configuration information in ability, network entity gets access to session ability information or/and configuration information by inquiry Capability ProvideFunction.

7, method as claimed in claim 5 is characterized in that, the session ability information of described SIP network support or/and the acquisition process of configuration information be:

8, the method for claim 1 is characterized in that, described each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or the process of its combination in any operation is:

9, the method for claim 1 is characterized in that, each different piece information in the described session ability information entrained to conversation message one of make amendment, increase and delete or its combination in any operation before, also comprise determining step:

10, method as claimed in claim 9, it is characterized in that, describedly judge that whether network entity one of is made amendment, increased and delete each different piece information in the entrained session ability information of conversation message or its combination in any operation is that one of the ability according to network entity, the session ability information of network entity and configuration information of network entity or its combination in any are judged, the session ability information of this network entity be obtain or storage in advance.

11, the method for claim 1, it is characterized in that, when conversation message is that session is set up request message, when negotiation message or session updates message are set up in session, described each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or the process of its combination in any operation is:

12, the method for claim 1, it is characterized in that, when conversation message is that session is set up response message, when acknowledge message or session updates acknowledge message are set up in session, described each different piece information in the entrained session ability information of conversation message one of is made amendment, increased and delete or the process of its combination in any operation is:

13, as claim 5,6,7,10 or 11 described methods, it is characterized in that described session ability information is or/and configuration information comprises one of the form of medium type, host-host protocol, medium, transport address, port numbers and attribute information of medium or its combination in any.

14, the method for claim 1 is characterized in that, described conversation message comprises one or more session ability information piece.

15, method as claimed in claim 14 is characterized in that, described session ability information piece is concluded by attribute information, and the session ability information piece is discerned by network entity by the attribute information under it.

16, method as claimed in claim 14 is characterized in that, described session ability information piece is distinguished by one of numbering, session ability information opening flag information, professional ability end mark information and length information or its combination in any.

17, as claim 8,11,12 or 15 described methods, it is characterized in that described attribute information comprises: one of the importance of the session ability information after operator's informaiton, network entity type information, the network entity sign of making amendment, session ability information action type, session ability information operation flag, the operation and precedence information or its combination in any.

As claim 8,11,12 or 15 described methods, it is characterized in that 18, described attribute information is carried in the conversation message that adopts Session Description Protocol SDP, perhaps be carried in the message header or message body of the conversation message that adopts SIP.

19, method as claimed in claim 15 is characterized in that, the information of described attribute information sign session ability information piece belonging network entity is or/and the prior information of sign session ability information piece.

20, method as claimed in claim 14 is characterized in that, described conversation message is for adopting the conversation message of SDP, and the session ability information that described conversation message carries adopts describes media information Language XML or script SCRIPT description.

21, the method for claim 1 is characterized in that, described network entity is application server AS, CCF CSCF, media resource function MRF or sip server;

Wherein AS controls PoC service function, MPTY server Conference Server, service capacity interactive managing device Service Capability InteractionManager, presents service server Presence Server or Interworking gateway IWF for control PTT PoC service function, participation; CSCF is proxy-call session control function P-CSCF, serving-call session control function S-CSCF or query call controlled function I-CSCF; Sip server is the ALG SIP-ALG of CCF CSCF or exhalation borde gateway controlled function BGCF or Session Initiation Protocol; MRF is that media resource control MRFC or media resource are handled MRFP.

22, the method for claim 1 is characterized in that, described SIP network comprises the same SIP network under calling party and the callee;

23, a kind of session ability information network operating entity is characterized in that this network entity comprises: the receiver module of Lian Jieing, tactful acquisition module and processing module, respond module that is connected with processing module and forwarding module respectively successively; Wherein, receiver module, respond module and forwarding module also are connected with each terminal in the Session initiation Protocol SIP network;

24, network entity as claimed in claim 23, it is characterized in that, this network entity comprises that also ability provides function Capability provide Function, be connected with the tactful acquisition module in the network entity, be used for providing the strategy of the processing conversation message of self preserving to the tactful acquisition module of network entity.

25, network entity as claimed in claim 23 is characterized in that, described network entity is application server AS, CCF CSCF, media resource function MRF or sip server;

26, network entity as claimed in claim 23 is characterized in that, described SIP network comprises the same SIP network under calling terminal and the terminal called;