CN101114985A - Coding/decoding transition system and method - Google Patents
Coding/decoding transition system and method Download PDFInfo
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Abstract
The invention discloses a coding-decoding conversion system, comprising a coding-decoding conversion control module and a coding-decoding conversion execution module, wherein, the coding-decoding conversion control module which is arranged on an intercommunicating session signaling path of an IP multimedia subsystem network and other IP networks or IP multimedia subsystem networks of different operators is used for triggering the coding-decoding conversion function, generating coding-decoding conversion information and controlling session participator media stream to route to the coding-decoding conversion execution module; the coding-decoding conversion execution module is used for executing the coding-decoding conversion function according to the coding-decoding conversion information. The invention also discloses a coding-decoding conversion method. By utilizing the invention, the coding-decoding conversion between intercommunicating IMS network and other IP networks can be realized; the IP multimedia subsystem network can intercommunicate with other networks by voice and video service, which ensures the business continuity in network evolution process.
Description
Technical field
The present invention relates to network communications technology field, be specifically related to a kind of coding-decoding switch system and method.
Background technology
IMS (IP Multimedia Subsystem, IP Multimedia System) is 3GPP (Third GenerationPartnership Projects, third generation partnership project) subsystem of the support IP multimedia service of Ti Chuing, its core characteristics are by SIP (Session Initiation Protocol, session initiation protocol) agreement realizes the foundation of IP multimedia service, functions such as maintenance and management, allow operator quick, dispose multimedia service efficiently, and the type of the access way of dependency network and terminal equipment not, support fixed network and 802.11,802.15,802.16, the session of any kind on CDMA (code division multiple access) or the GSM wireless networks such as (global system for mobile communicationss) allows the service provider that the multimedia service of a series of speeches and data fusion is provided to the user.
At present, many international and domestic organizing all at the network integration scheme of research based on IMS, wherein TISPAN (The Telecoms﹠amp; Internet converged Services﹠amp; Protocols for AdvancedNetworks) formulate following NGN network of network framework as international organizing, as shown in Figure 1, comprise following functional entity with European telecommunication standard:
P-CSCF (agent conversation control function) is the Xin Lingdaili entity of IMS terminal access to IMS network;
I/S-CSCF (inquiring/service call conversation control function) finishes call session control;
BGCF (Breakout Gateway Control Function) finishes the network egress selection function;
MRFC (Multimedia resource function controller (MRFC)) is a resource control function, is used for the control of MRFP (Multimedia resource function processor (MRFP));
MRFP mainly finishes the processing (as Multi-Party Conference, Audiocode conversion) of Media Stream;
MGCF (MGCF) is with circuit-domain network signalling interworking entity, by with the intercommunication of finishing IMS network and circuit-domain network that cooperates of T-MGF (Trunk Media Gateway function);
IBCF (Interconnection Border Control Function) is IMS network and IP network interconnection entity;
IBGF (Interconnection Border Gateway Function) is IMS network and IP network Interworking gateway;
IWF (Interworking Function, IWF) mainly finishes IMS network and other IP network signalling interworking functions in the intercommunication process.
Though the WeiLai Technology development trend be fix, the mobile network is unified, diverse network is to unified network architecture evolution, but network evolution is a long-term process, and the multiple network system will exist in the certain hour scope simultaneously, therefore needs the problem that interconnects between the consideration diverse network.For this reason, the model of a kind of IMS with the IP network intercommunication proposed in the prior art, as shown in Figure 2:
Wherein, interconnection entity IBCF is the functional entity on two carrier network borders of control, its function comprises: and transport layer resource function entity, be that IBGF is mutual, also may be indirect mutual, finish functions such as NAPT (Network Address and Port Translation, the network address and port numbers translation)/FW (FireWall, fire compartment wall), IP Qos (service quality) label distribution; When needs and non-SIP (SessionInitiation Protocol, Session initiation Protocol) territory intercommunication and entity IWF mutual, finish SIP to conversion, the THIG functions such as (topology hiding) of non-SIP (as H.323).IBGF is a Border Gateway Function, mainly finishes the execution function of IP version conversion, and RACS (resource admission control subsystem) finishes IBGF resource management, controlled function.Utilize IBCF, IBGF to carry out mutual model IP version conversion and signaling shielding problem when mainly having solved IMS with other IP network intercommunications as interconnection entity, when not solving IMS with other IP network intercommunications, user's face media stream code/decode transfer problem.
Summary of the invention
Main purpose of the present invention provides a kind of coding-decoding switch system, when overcoming existing IMS network and other IP network intercommunications, can not carry out the shortcoming of encoding and decoding conversion, guarantees that IMS network and other IP network carry out the intercommunication of voice, video traffic.
Another object of the present invention provides a kind of encoding and decoding conversion method, to guarantee in the network evolution process IMS network and other IP network service intercommunication.
For this reason, the invention provides following technical scheme:
A kind of coding-decoding switch system, the encoding and decoding conversion when being used to realize IP Multimedia System network and IP network intercommunication, described system comprises: encoding and decoding conversion control module, encoding and decoding conversion Executive Module, wherein,
The encoding and decoding conversion control module is positioned on the session signaling path of IP Multimedia System network and other IP network intercommunications or the network interworking of different operators IP Multimedia System, be used to trigger encoding and decoding conversion function, generate encoding and decoding conversion information, and control session participant Media Stream routes to the encoding and decoding conversion Executive Module;
The encoding and decoding conversion Executive Module is used for according to described encoding and decoding conversion information and executing encoding and decoding conversion function.
Preferably, the encoding and decoding conversion control module is carried out interacting message by session initiation protocol and IMS core net, by session initiation protocol or H.323 agreement and described other IP network to carry out signaling message mutual.
Alternatively, the header field or the message parameter of expansion session initiation protocol carry described encoding and decoding conversion information; Perhaps the property value of extended Diameter protocol carries described encoding and decoding conversion information to AVP.
Preferably, the encoding and decoding conversion Executive Module connects IMS network and other IP network user face Media Stream by the IP agreement.
Described encoding and decoding conversion control module comprises:
The codec functions trigger module, the session signaling of identification IP Multimedia System network and other IP network intercommunications triggers encoding and decoding conversion function, and generates encoding and decoding conversion information according to session signaling;
The Signalling exchange module, mutual with the encoding and decoding Executive Module, be used to finish the transmission of described encoding and decoding conversion information;
Session according to encoding and decoding conversion information, is set up, revised to the session processing module.
Described Signalling exchange module uses initial session protocol or Diameter and encoding and decoding Executive Module to carry out alternately.
Described encoding and decoding conversion control module is specially: have the borde gateway controlled function entity IBCF of encoding and decoding conversion controlled function, perhaps the IMS application server.
Described encoding and decoding Executive Module comprises:
The resource control module is used for the execution according to described encoding and decoding conversion information Control encoding and decoding conversion process;
Medium process module is accepted the control of resource processing module, finishes the encoding and decoding conversion of user's face Media Stream.
Adopt MGCP or internal agreement to carry out alternately between described resource control module and the medium process module.
Described resource control module is specially: have the IP Multimedia System resource admission control subsystem RACS of MGCF, perhaps IMS Multimedia resource function controller (MRFC) MRFC.
Described medium process module is specially: have the IMS Border Gateway Function entity B GF of encoding and decoding conversion ability, perhaps IMS Multimedia resource function processor (MRFP) MRFP.
Described encoding and decoding conversion information is the information of sign session participant media stream code/decode type.
Described encoding and decoding conversion information further comprises: encoding and decoding conversion function identification information or encoding and decoding conversion resource bid information or encoding and decoding conversion resource description information.
A kind of encoding and decoding conversion method, the encoding and decoding conversion when being used to realize IP Multimedia System network and IP network intercommunication, described method comprises step:
According between IP Multimedia System network and other IP network or the call session signaling between the different operators IP Multimedia System network, trigger encoding and decoding conversion function, generate encoding and decoding conversion information;
According to described encoding and decoding conversion information conversation media stream is carried out encoding and decoding conversion.
Describedly the step that conversation media stream carries out encoding and decoding conversion is comprised according to described encoding and decoding conversion information:
Obtain the encoding and decoding conversion resource according to described encoding and decoding conversion information;
According to described encoding and decoding conversion resource conversation media stream is carried out encoding and decoding conversion.
Described encoding and decoding conversion information comprises:
Encoding and decoding conversion function identification information, and/or session participant media stream code/decode information, and/or border horse tts resource application information, and/or encoding and decoding conversion resource description information.
By above technical scheme provided by the invention as can be seen, system of the present invention discerns the session signaling of IMS network and other IP network by the encoding and decoding conversion control module on the session signaling path that is positioned at IMS network and other IP network intercommunications, determine when that according to session signaling needs carry out encoding and decoding conversion, and generation encoding and decoding conversion information passes to the encoding and decoding Executive Module, after the encoding and decoding Executive Module is received this information, distribute the encoding and decoding conversion resource, and these resource description information are passed to the Media Stream that the encoding and decoding conversion control module makes it to control the session participant route to the encoding and decoding conversion Executive Module, utilize this resource to finish the conversion of user media stream encoding and decoding by the encoding and decoding conversion Executive Module then.Utilize the present invention, not only can realize the intercommunication of IMS network and other IP network voice, video traffic effectively, guarantee the business continuance in the network evolution process; And can be in conjunction with the model of IMS network of the prior art and other IP network intercommunications, the function of each module of system of the present invention is integrated on the related entities of this model, increase the function of this mutual model, the conversion of IP version when making this model not only can realize the IMS network with other IP network intercommunications, and realize service intercommunication between heterogeneous networks.
Description of drawings
Fig. 1 is the system configuration schematic diagram of IMS;
Fig. 2 is the model schematic diagram of IMS and IP network intercommunication in the prior art;
Fig. 3 is the theory diagram of a kind of embodiment of system of the present invention;
Fig. 4 is the realization flow figure that system of the present invention is realized first embodiment of encoding and decoding conversion in conjunction with existing IMS network and IP network intercommunication framework;
Fig. 5 is the realization flow figure that system of the present invention is realized second embodiment of encoding and decoding conversion in conjunction with existing IMS network and IP network intercommunication framework;
Fig. 6 is the realization flow figure of the inventive method.
Embodiment
Core of the present invention is to discern by the encoding and decoding conversion control module on the session signaling path that is positioned at IMS network and other IP network intercommunications the session signaling of IMS network and other IP network, determine when that according to session signaling needs carry out encoding and decoding conversion, and generation encoding and decoding conversion information passes to the encoding and decoding conversion Executive Module, after the encoding and decoding Executive Module is received this information, distribute the encoding and decoding conversion resource, and these resource description information are passed to the Media Stream that the encoding and decoding conversion control module makes it to control the session participant route to the encoding and decoding conversion Executive Module, utilize this resource to finish the conversion of user media stream encoding and decoding by the encoding and decoding conversion Executive Module then.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
The present technique field personnel know, the voice that the terminal of different communication networks is supported, the coding/decoding capability difference of video traffic, as 3GPP (Third Generation Partnership Projects, third generation partnership project) having defined the default code/decode type of voice at the network terminal is AMR (Adaptive MultiRate, adaptive multi-rate) type, the video traffic code/decode type is for H.261, and existing IP network is as H.323, the code/decode type of the soft switchcall server voice that requirement is supported according to GB is for G.7xx serial, the coding and decoding video type is a H.XX series etc., therefore carry out voice at the IMS network with IP network, during the video traffic intercommunication, owing to participate in the difference of the terminal of session for the conversation media code/decode type, carry out the regular traffic intercommunication for business, the demand of encoding and decoding conversion in the time of will existing for the user plane intercommunication.
For this reason, the different demands of the encoding and decoding when the present invention is directed to the IMS network with the IP network intercommunication, the principle of a kind of embodiment of the system of encoding and decoding conversion is as shown in Figure 3 during the realization different IP networks intercommunication of proposition:
With reference to Fig. 3, between this system's connection and IMS network S01 and the IP network S02, comprising: encoding and decoding conversion control module S11, encoding and decoding conversion Executive Module S12.Wherein, encoding and decoding conversion control module S11 is positioned on the session signaling path of IP Multimedia System IMS network and other IP network intercommunications, perhaps on the session signaling path of different operators IMS (IP Multimedia System) network interworking, be used for generating encoding and decoding conversion information according to described session signaling, this information comprises: session participant medium codec type information can further include: encoding and decoding conversion function identification information or encoding and decoding conversion resource bid information or encoding and decoding conversion resource description information.
Then encoding and decoding conversion information is passed to encoding and decoding conversion Executive Module S12, obtain the encoding and decoding conversion resource description information from encoding and decoding conversion Executive Module S12 simultaneously, utilize the Media Stream of this resource description information control session participant to route to encoding and decoding conversion Executive Module S12.
Encoding and decoding conversion control module S11 links to each other with the IMS core net by the I0 interface, links to each other with IP network by the I1 interface, and the session control signaling by identification I0, I1 interface carries out the judgement of encoding and decoding conversion function.Encoding and decoding conversion control module S11 links to each other with the encoding and decoding conversion Executive Module by the I3 interface, transmits encoding and decoding conversion information, and the Media Stream of control session participant routes to the encoding and decoding conversion Executive Module.H.323 or other call session control protocols based on the IP agreement wherein, the I0 interface adopts Session Initiation Protocol, and the I1 interface adopts Session Initiation Protocol or, the I3 interface adopts Session Initiation Protocol or Diameter.
For the session control signaling of I0, I1 interface is judged in identification effectively, and trigger encoding and decoding conversion operation according to this signaling, encoding and decoding conversion control module S11 comprises: codec functions trigger module S21, Signalling exchange module S22 and session processing module S23.Wherein, codec functions trigger module S21 is used to discern the session signaling of IMS network and other IP network intercommunications, and generates encoding and decoding conversion information according to this signaling; Signalling exchange module S22 is used for sending the encoding and decoding conversion information that the codec functions trigger module generates to encoding and decoding conversion Executive Module S12, and obtains the encoding and decoding conversion resource description information from encoding and decoding conversion Executive Module S12; Session processing module S23 is used for according to the resource description that Signalling exchange module S22 is obtained session participant Media Stream being routed to encoding and decoding conversion Executive Module S12.
Encoding and decoding conversion Executive Module S12 is that codec functions is carried out entity, connects IP network user face media resource by the I2 interface, connects IMS network user's face media resource by the I5 interface.Wherein, I2, I5 interface are based on the IP agreement, as RTP (real time transport protocol), RTCP (RTCP Real-time Transport Control Protocol) etc.
In order to carry out encoding and decoding conversion function, encoding and decoding conversion Executive Module S12 comprises: resource control module S24 and medium process module S25.
Wherein, resource control module S24 use I3 interface and encoding and decoding conversion control module S11 are mutual, finish the execution control of codec functions according to the encoding and decoding conversion information of I3 interface transmission; Medium process module S24 is used to carry out the processing of user's face media stream code/decode conversion.
Resource control module S24 and medium process module S25 can be same physical entity, also can be different physical entities.When resource control module S24 and medium process module S25 are positioned at same physical entity, can adopt internal agreement to carry out alternately; When being positioned at different physical entities, can adopt MGCP to carry out alternately between resource control module S24 and the medium process module S25.
IP network S02 can be based on the network of IP agreement, also can be IMS network or H.323 network or SIP network.
The encoding and decoding conversion control module can be carried encoding and decoding conversion information by the header field or the message parameter of expansion session initiation protocol, sends it to resource control module; Also can carry encoding and decoding conversion information to AVP, send it to resource control module by the property value of extended Diameter (a kind of new aaa protocol) agreement.
Described encoding and decoding conversion information comprises: session participant medium codec type information can further include: the information that can identify encoding and decoding conversion function.
System of the present invention can be used as an independent function entity and places between IMS network and the IP network or between two or more different operators IMS network, also can combine with the model of other IP network intercommunications with IMS network of the prior art, the function of each module of system of the present invention is integrated on the related entities of this model, increase the function of this mutual model, the conversion of IP version when making this model not only can realize the IMS network with other IP network intercommunications, and realize service intercommunication between heterogeneous networks.
In this case, encoding and decoding conversion control module S11 can be the IBCF (borde gateway controlled function entity) with encoding and decoding conversion controlled function, or the IMS application server; Middle resource control module S24 in the encoding and decoding conversion Executive Module can be IMS RACS (resource admission control subsystem), perhaps IMS MRFC (Multimedia resource function controller (MRFC)); Medium process module S25 in the encoding and decoding conversion Executive Module can be IMS BGF (Border Gateway Function) entity with encoding and decoding conversion function, perhaps IMS MRFP (Multimedia resource function processor (MRFP)).
Below with reference to IMS system configuration shown in Figure 1 this is described respectively for example, resource control module among the figure in the encoding and decoding conversion Executive Module and medium process module are two independent function entity.
With reference to flow process shown in Figure 4, in this embodiment, use IBCF as the encoding and decoding conversion control module, use Diameter as the I3 interface protocol:
1. the conversation request message SIP INVITE from IMS UE is routed to IBCF (Interconnection Border Gateway Function) by S-CSCF (service call conversation control function) or BGCF (Breakout Gateway Control Function), comprise the encoding and decoding description that UE initiates this conversation request during SDP in the message (Session Description Protocol) m is capable, abbreviate codec1 here as.
2.IBCF send the SIPINVITE of the coding/decoding capability (coding/decoding capability is the union of the codec1 of UE transmission with the coding/decoding capability of encoding and decoding conversion Executive Module support) that includes this session to the far-end IP network by the I1 interface, here abbreviate codec2 (when H.323 far-end network adopted agreement, coding/decoding information can be described) as in the relevant information unit such as Audiocapability, videocapability of serial protocols H.323.
3. far-end network uses 183 progress message response conversation request, and comprises the encoding and decoding description that remote subscriber is supported in message SDP, abbreviates codec3 here as.
4.IBCF judge that according to the coding/decoding capability description that calling and called terminal in the session signaling sends these session needs provide encoding and decoding conversion function (can certainly adopt other modes to judge, the CODEC that directly transmits the calling subscriber as IBCF in above-mentioned steps 2 equally can judge whether need carry out encoding and decoding conversion function by terminal called to the 4xx refuse information of this session to terminal called).For realizing that session routes to Border Gateway Function, need on Border Gateway Function, to apply for earlier related resource, IBCF is by the resource control module, and application is at the Resource Properties (A, B, C, D among flow process such as the figure) of calling and called code/decode type application on the Border Gateway Function entity.After obtaining resource capability, IBCF sends SIP 183progress message to caller IMS user, SDP describes at the media resource that the caller coding/decoding capability distributes for describing borde gateway in the message, and purpose makes the caller Media Stream route to encoding and decoding conversion and carries out functional module.
5.IBCF send SIP UPDATE message to the called subscriber, SDP is that the media resource at called coding/decoding capability that Border Gateway Function distributes is described in the message, makes called Media Stream route to Border Gateway Function.
6. far-end network uses 200OK responds SIP UPDATE message.
7. far-end network uses 200OK to reply session.
8.IBCF use 200OK to reply session, session this moment is set up, the calling and called Media Stream all routes to Border Gateway Function, and Border Gateway Function is finished the codec functions conversion of user's face Media Stream, makes business intercommunication be accomplished.
In the said process, the same RACS of IBCF (resource admission control subsystem) is mutual, RACS is as follows with the flow process that Border Gateway Function carries out codec functions control alternately:
Steps A: IBCF judges according to session signaling, session this time need be carried out encoding and decoding conversion, need respectively at the master, called coding/decoding capability, on borde gateway, apply for media resource, IBCF reaches this purpose by sending Diameter AA-Request message, property value carry respectively in to (AVP) Media-Component-Description call out main, the called medium type that makes both sides support (is voice in this example, also can be video) RR-bandwidth, the bandwidth information of RS-bandwidth indication request, in V6-Transport-Address AVP (or V4-Transport-Address AVP), carry the master, the IP address information that the called side of crying SDP describes is carried calling party's port numbers in Port-Number AVP.
In the present invention in order to make Diameter can carry the coding/decoding information of session, can extended Diameter AVP, make it in calling procedure, can carry the session coding/decoding information.Be exemplified below:
Attribute?Name：media-codec
AVP Code: the integer value, as 530, suggestion is carried among the AVP " V " bit, and suggestion is carried " M " bit, represent that this AVP is a vendor specific, be that the recipient must discern.Can carry out End-to-End Security encrypts.
Value?Type：Grouped
This AVP formal definition is as follows:
AVP?Format：
Globally-Unique-IP-Address::＝<AVP?Header:xxx?13019>
[audio-codec]
[video-codec]
Wherein, audio codec describes the encoding and decoding speech type of current application resource, and video-codec describes the coding and decoding video type of current application resource.
After step B:RACS receives this message, carry out decoding translation function to being judged as needs at the Media Stream of describing in the AA-Request message according to the media-code attribute, and need distribute relevant encoding and decoding conversion resource at the code/decode type of media-code attribute description, therefore RACS adopts the media gateway controlling control procedure, mutual by H.248 ordering with BGF, respectively at calling and called coding/decoding capability among the above-mentioned AVP, apply for the needed media resource of this session, and control BGF sets up binding relationship between these resources.
Step C:BGF carries out medium gateway function, according to the resource of the coding/decoding capability information distribution of carrying in the message H.248, and resource description information is fed back to RACS.
Step D:RACS is converted into Diameter AA-Answer message and sends to IBCF according to the Resources allocation information that BGF returns, and does further processing by IBCF.
After step e～H:IBCF receives called session response message, carry Flow-status AVP (flow status attribute to) by AA-Request, indication is revised encoding and decoding media conversion stream and is two-way connection, RACS then is relevant H.248 control procedure (adopting H.248modify message in this example) with this information translation, BGF is controlled, set up the connection of two-way media stream after taking orders by BGF, and execution is for the encoding and decoding conversion process (IBCF also can transmit Flow-status AVP in same AA-Request message directly in step B certainly) of medium stream information.
IBCF is for the application of calling and called media resource, can finish in an AA-request message, also can send two AA-request respectively and finish.When adopting two AA-request message of transmission, IBCF can promptly begin resource bid after receiving the caller conversation request message, can certainly obtain the master at the same time, be begun resource bid behind the coding/decoding capability, does not have strict sequential requirement.
Need to prove, above the expansion of describing about coding/decoding capability among Diameter and SIP embodiment below explanation can adopt this extended method to make RACS understand needed encoding and decoding conversion ability, and this does not also mean that describing coding/decoding information must expand according to the mode that above provides.
With reference to Fig. 5, in this embodiment, use MRFC as the resource control module:
The encoding and decoding conversion controlled function is carried out interacting message with MRFC by call session functions process with above-mentioned embodiment process, has been omitted in step 1～8 among the figure.
Steps A～D, the Border Gateway Function entity transmits coding/decoding information alternately with the media resource control module, and obtains the MRFP media resource, and the encoding and decoding conversion process is carried out in indication.Detailed process is as follows:
A: the encoding and decoding control module sends the SIP INVITE to MRFC, carrying calling and called SDP in the message body respectively describes, MRFC is at calling and called SDP allocation medium resource in indication, and the binding relationship of allocation medium resource with the calling and called media resource set up in control.
For in sip message, transmitting this information, can adopt following method:
(1) in sip message request row, increase the keyword that identifies codec functions, as:
INVITE?SIP：media_alloc.transcode@MRFC.OPERTOR1.HU?SIP/2.0
Wherein the Media_alloc.Transcode keyword has identified encoding and decoding conversion information, and indication needs to carry out encoding and decoding conversion function, and need distribute the encoding and decoding conversion media resource at the calling and called media description in the message body, and sets up binding relationship for it.
(2) carry parameter in the SIP INVITE and indicate, need dispense needles to SDP allocation medium resource among the SIP INVITE, and set up binding relationship.Can realize that as newly-increased Transcoding-function header field, and new medium type is realized by newly-increased SIP header field.Dummy message is described below:
INVITE?SIP：transcode@MRFC.operator1.hu?SIP/2.0
Transcoeding-function:<alloc?media>
Wherein, SIP header field Transcoding-function value [alloc media] sign encoding and decoding control information, sign indication allocation medium resource, and carry out at the media resource that distributes and carry out encoding and decoding conversion function.
After B, resource control module (being MRFC) are received INVITE, describe according to the calling and called SDP that carries in the message body, mutual with MRFP (Multimedia resource function processor (MRFP)) as the encoding and decoding conversion Executive Module, at calling and called SDP allocation medium resource, and set up the binding relationship of institute's Resources allocation with the calling and called medium.
C, encoding and decoding conversion Executive Module MRFP return the media description of distribution to MRFC in REPLY message.
D, MRFC use 200OK message to respond, and carry the media resource SDP that distributes at the calling and called coding/decoding capability respectively in the message body and describe.
E～F, MRFC receive connection control information in the re-invite message of encoding and decoding controlled function, and indication encoding and decoding conversion Media Stream is set up two-way connection, and H.248 MRFC is converted into that MODIFY message modification connection attribute is two-way connection.
After G～H, MRFC receive the response message of MRFP, reply the SIP request of MRFC.
As seen, apply the present invention on existing IMS network and other IP network intercommunication frameworks, need not to increase new network element device, can realize encoding and decoding conversion to the conversation media stream of IMS network and other IP network intercommunications, realize IMS network and the real intercommunication of other IP network, thereby guarantee the business continuance in the network evolution process.
With reference to Fig. 6, Fig. 6 shows the realization flow of the inventive method, may further comprise the steps:
Step 601: obtain between IMS network and other IP network or the call session signaling between the different operators IMS network.
Step 602: judge whether to carry out encoding and decoding conversion.If desired, then enter step 403; Otherwise, enter step 406.
Step 603: generate encoding and decoding conversion information according to the call session signaling.Described encoding and decoding conversion information comprises: encoding and decoding conversion function identification information, and/or session participant media stream code/decode information, and/or border horse tts resource application information, and/or encoding and decoding conversion resource description information.
Step 604: obtain the encoding and decoding conversion resource according to encoding and decoding conversion information.
Step 605: utilize the encoding and decoding conversion resource to finish the conversion of user media stream encoding and decoding.
Step 606: carry out signaling process.
Utilize the present invention, encoding and decoding conversion in the time of can realizing the IMS network with other IP network intercommunications and different operators IMS network interworking, make the IMS network can carry out the intercommunication of voice, video traffic, guarantee the business continuance in the network evolution process with other networks.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (16)
1. coding-decoding switch system, the encoding and decoding conversion when being used to realize IP Multimedia System network and IP network intercommunication is characterized in that, described system comprises: encoding and decoding conversion control module, encoding and decoding conversion Executive Module, wherein,
The encoding and decoding conversion control module is positioned on the session signaling path of IP Multimedia System network and other IP network intercommunications or the network interworking of different operators IP Multimedia System, be used to trigger encoding and decoding conversion function, generate encoding and decoding conversion information, and control session participant Media Stream routes to the encoding and decoding conversion Executive Module;
The encoding and decoding conversion Executive Module is used for according to described encoding and decoding conversion information and executing encoding and decoding conversion function.
2. system according to claim 1 is characterized in that,
The encoding and decoding conversion control module is carried out interacting message by session initiation protocol and IMS network, by session initiation protocol or H.323 agreement and described other IP network to carry out signaling message mutual.
3. system according to claim 2 is characterized in that,
The header field or the message parameter of expansion session initiation protocol carry described encoding and decoding conversion information; Perhaps
The property value of extended Diameter protocol carries described encoding and decoding conversion information to AVP.
4. system according to claim 1 is characterized in that,
The encoding and decoding conversion Executive Module connects IMS network and other IP network user face Media Stream by the IP agreement.
5. system according to claim 1 is characterized in that, described encoding and decoding conversion control module comprises:
The codec functions trigger module, the session signaling of identification IP Multimedia System network and other IP network intercommunications triggers encoding and decoding conversion function, and generates encoding and decoding conversion information according to session signaling;
The Signalling exchange module, mutual with the encoding and decoding Executive Module, be used to finish the transmission of described encoding and decoding conversion information;
Session according to encoding and decoding conversion information, is set up, revised to the session processing module.
6. system according to claim 5 is characterized in that,
Described Signalling exchange module uses initial session protocol or Diameter and encoding and decoding Executive Module to carry out alternately.
7. system according to claim 5 is characterized in that, described encoding and decoding conversion control module is specially: have the borde gateway controlled function entity IBCF of encoding and decoding conversion controlled function, perhaps the IMS application server.
8. system according to claim 1 is characterized in that, described encoding and decoding Executive Module comprises:
The resource control module is used for the execution according to described encoding and decoding conversion information Control encoding and decoding conversion process;
Medium process module is accepted the control of resource processing module, finishes the encoding and decoding conversion of user's face Media Stream.
9. system according to claim 8 is characterized in that,
Adopt MGCP or internal agreement to carry out alternately between described resource control module and the medium process module.
10. system according to claim 8 is characterized in that, described resource control module is specially: have the IP Multimedia System resource admission control subsystem RACS of MGCF, perhaps IMS Multimedia resource function controller (MRFC) MRFC.
11. system according to claim 8 is characterized in that, described medium process module is specially: have the IMS Border Gateway Function entity B GF of encoding and decoding conversion ability, perhaps IMS Multimedia resource function processor (MRFP) MRFP.
12. system according to claim 1 is characterized in that, described encoding and decoding conversion information is the information of sign session participant media stream code/decode type.
13. system according to claim 12 is characterized in that, described encoding and decoding conversion information further comprises: encoding and decoding conversion function identification information or encoding and decoding conversion resource bid information or encoding and decoding conversion resource description information.
14. an encoding and decoding conversion method, the encoding and decoding conversion when being used to realize IP Multimedia System network and IP network intercommunication is characterized in that, described method comprises step:
According between IP Multimedia System network and other IP network or the call session signaling between the different operators IP Multimedia System network, trigger encoding and decoding conversion function, generate encoding and decoding conversion information;
According to described encoding and decoding conversion information conversation media stream is carried out encoding and decoding conversion.
15. method according to claim 14 is characterized in that, describedly according to described encoding and decoding conversion information the step that conversation media stream carries out encoding and decoding conversion is comprised:
Obtain the encoding and decoding conversion resource according to described encoding and decoding conversion information;
According to described encoding and decoding conversion resource conversation media stream is carried out encoding and decoding conversion.
16. method according to claim 14 is characterized in that, described encoding and decoding conversion information comprises:
Encoding and decoding conversion function identification information, and/or session participant media stream code/decode information, and/or border horse tts resource application information, and/or encoding and decoding conversion resource description information.
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