CN101330507B - Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation - Google Patents
Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation Download PDFInfo
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Abstract
The invention provides a realization method for narrow-band adaptive multi-rate encoding and decoding negotiation. The method comprises the following steps: (a) an initiating point of encoding and decoding negotiation sends an encoding and decoding negotiation message, and the encoding and decoding negotiation message includes encoding and decoding information and information whether optimization is permitted; (b) a stopping point of the encoding and decoding negotiation receives the encoding and decoding negotiation message, then decodes the message, and determines whether optimization is permitted in the received message and local strategy encoding and decoding modifying information with permission; (c) the initiating point of the encoding and decoding negotiation obtains encoding and decoding negotiation results after receiving an encoding and decoding negotiation response message, and accomplishes one-time encoding and decoding negotiation process. The method has the advantages that the method is concise and highly effective, can correctly accomplish the parametric description of AMR information in an IMS network, and reduce the unnecessary expenses.
Description
Technical field
The present invention relates to IP multimedia system (IMS), especially a kind of IMS network carries out the implementation method that narrowband self-adaption multi-speed (Adaptive Multi-Rate AMR-NB is called for short AMR below) encoding and decoding speech is consulted.
Background technology
IMS introduces in 3GPP R5 version, is superimposed upon on the packet field network, is made up of CCF (CSCF), medium webmaster controlled function (MGCF), media resource controlled function (MRF), home signature user server functional entitys such as (HSS).Wherein MGCF realizes the IWF of IMS network and other network.In the IMS network with SIP (Session Initiation Protocol session initiation protocol)/SDP (Session Description Protocol Session Description Protocol) as the chain of command signaling.
Narrowband self-adaption multi-speed (Adaptive Multi-Rate AMR-NB) encoding and decoding speech comprises the code encoding/decoding mode of 8 kinds of different rates, realizes optimum balance to indexs such as transmission bandwidth utilance, voice qualities by the dynamic adjustment between different rates.
The AMR-NB encoding and decoding all are essential encoding and decoding in Circuit Switching Network and IMS network, so the application of AMR-NB in the IMS network is very important and necessary.
There are the following problems based on the Circuit Switching Network of BICC (Bearer Independent Call Control carrying independent call control) and IMS network interworking the time:
According to the 3GPP agreement, the arrowband AMR encoding and decoding of using in circuit-switched network OoBTC (the outer encoding and decoding control of the Out ofband transcoder control band) negotiations process can be divided into many code/decode types, as FR AMR (Full Rate AMR), HR AMR (Half Rate AMR), code/decode types such as UMTS AMR, UMTS AMR2.Various code/decode types have difference at tiny places such as rate modes, but all belong to the AMR encoding and decoding.
The relevant parameter that these code/decode types are described comprises ACS (Active Codec Set activates the encoding and decoding collection), SCS (Supported Codec Set supports the encoding and decoding collection), MACS (maximum number of encoding/decoding mode among the Maximal number ofcodec modes in the ACS ACS), OM (the optimization pattern of OptimisationMode for ACS ACS) etc.The wherein ACS available encoding and decoding set representing to activate, the encoding and decoding set that SCS expresses support for, ACS is the subclass of SCS generally speaking.MACS represents the maximum encoding and decoding quantity that allows among the ASC, and OM represents whether the ACS that carries in the message allows to be modified.
In the IMS network, the various concrete code/decode type in the discrimination circuit switching network does not unify to be called arrowband AMR encoding and decoding.Relevant SDP characterising parameter comprises mode-set, mode-change-period, mode-change-neighbor, is used for carrying information such as coding/decoding information, encoding and decoding change cycle and change span respectively.In the SDP negotiation of IMS, the agreement regulation can not be revised the set of the encoding and decoding among the mode-set, if promptly a kind of encoding and decoding are not wherein supported, just expression is not supported this mode-set.
When Circuit Switching Network and IMS network carry out intercommunication, need to shine upon between above-mentioned two kinds of AMR parameters.In the agreement allocated circuit switching network to the IMS network side to, when OM is 0, the mode-set parameter is filled in according to ACS, when OM is 1, the mode-set parameter is according to ACS, SCS and MACS fill in, and the Single Codec in such Circuit Switching Network can be mapped as a lot of the SDP among the IMS and describe.
Be exemplified below:
Single Codec parameter in the circuit-switched network, ACS (a, b, c), SCS (a, b, c), MACS is 3, OM is 1 (expression allows to optimize ACS Optimisation of the ACS supported)
Be converted into SDP when describing, allow to optimize ACS, promptly need to comprise the various set of maximum 8 encoding and decoding among the SDP.All subclass of (a, b, c) these encoding and decoding in 3 just.The SDP that can produce is described as C (3,1)+C (3,2)+C (3,3)=7 kinds, comprises mode-set (a), mode-set (b), mode-set (c), mode-set (a, b), mode-set (a, c), mode-set (b, c) and mode-set (a, b, c).Two kinds of descriptor formats are as follows, when multiple description, by that analogy.
| m＝audio?3456?RTP/AVP?97?98a＝rtpmap：97?AMRa＝fmtp：97?mode-set＝0，2，5，7；mode-change-period＝2a＝rtpmap：98?AMRa＝fmtp：97?mode-set＝1，4，5；?mode-change-period＝2 |
If ACS is 4 kinds of encoding and decoding, the SDP that can produce is described as C (4,1)+C (4,2)+C (4,3)+C (4,4)=15 kinds.
If ACS is 8 kinds of encoding and decoding, the SDP that can produce is described as C (8,1)+C (8,2)+C (8,3)+C (8,4)+C (8,5)+C (8,6)+C (8,7)+C (8,8)=255 kinds.
As seen so numerous SDP describes and had both wasted transmission bandwidth, and expense is organized in the parsing that has also increased coding/decoding information, is very unpractical in real network.In modal RTP transmission, each SDP describes and wants a corresponding load type (PayloadType), and the dynamic load type of stipulating in RFC3551 is 96～127, only thirties available, as to produce when being far smaller than 8 kinds of encoding and decoding SDP descriptions.Therefore under present protocol frame, can't realize.
If the IMS side is supported the combination in any of multiple encoding and decoding, also there is same problem to Circuit Switching Network's direction in same IMS network.
Mutual at IMS network and other network such as PSTN equally, or in IMS network internal AMR negotiations process, also have such problem, to the situation of the combination in any of supporting many kinds of encoding and decoding of AMR, the expression of SDP also a large amount of descriptors can occur.If do not use these a large amount of SDP information descriptions, just can't fully carry out coding/decoding negotiation.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of implementation method of narrowband self-adaption multi-speed AMR coding/decoding negotiation, succinctly to finish the coding/decoding negotiation process of AMR efficiently.
For solving the problems of the technologies described above, the invention provides a kind of implementation method of narrowband self-adaption multi-speed AMR coding/decoding negotiation, this method may further comprise the steps:
(a) the initiation point of coding/decoding negotiation sends coding/decoding negotiation message, wherein comprises coding/decoding information and whether allows optimization information;
(b) after the destination node of coding/decoding negotiation receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the message of receiving, and reply the coding/decoding negotiation response message, carry amended coding/decoding information in this response message and whether allow optimization information;
(c) after the initiation of coding/decoding negotiation point is received the coding/decoding negotiation response message, obtain the coding/decoding negotiation result, finish the coding/decoding negotiation process one time.
Further, coding/decoding negotiation is initiated point and is sent coding/decoding negotiation message to the coding/decoding negotiation destination node in the step (a); Coding/decoding negotiation destination node transmission coding/decoding negotiation response message is initiated a little to coding/decoding negotiation in the step (b), to initiate to carry out coding/decoding negotiation between point and the coding/decoding negotiation destination node at coding/decoding negotiation.
Further, coding/decoding negotiation is initiated point and is sent coding/decoding negotiation message to the coding/decoding negotiation intermediate node in the step (a), and after the coding/decoding negotiation intermediate node receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the message of receiving, and send coding/decoding negotiation message to the coding/decoding negotiation destination node, the whether permission optimization information of wherein carrying the amended coding/decoding information of this intermediate node and determining; In the step (b), the coding/decoding negotiation destination node sends the coding/decoding negotiation response message to the coding/decoding negotiation intermediate node; The coding/decoding negotiation intermediate node receives that this message of coding/decoding negotiation response message transparent transmission of destination node is to initiating point, to initiate to carry out coding/decoding negotiation between point, intermediate node and the destination node at coding/decoding negotiation.
Further, if comprise the permission optimization information in the coding/decoding negotiation message, then receive when the intermediate node of this message and/or destination node are revised this coding/decoding information and from coding/decoding information, delete unsupported speed according to local policy; Do not allow optimization information if comprise in the coding/decoding negotiation message, and receive that the node of this message can not support this encoding and decoding fully, directly delete this coding/decoding information when then this node is revised coding/decoding information.
Further, comprise the permission optimization information in the coding/decoding negotiation message, and intermediate node only supports a certain subclass or the complete or collected works of the set of encoding and decoding in the coding/decoding information, then send to comprise in the coding/decoding negotiation message of destination node and do not allow optimization information.
Further, in the coding/decoding negotiation response message that the coding/decoding negotiation destination node is replied, carry the information optimized of not allowing.
Further, many coding/decoding informations and the whether permission optimization information corresponding respectively with these many coding/decoding informations are arranged in coding/decoding negotiation message and the coding/decoding negotiation response message.
Further, in the coding/decoding negotiation message whether allow optimization information to carry by the parameter in the Session Description Protocol message or the message header of conversation initiating protocol message carries.
Further, the initiation of coding/decoding negotiation point, intermediate network node and destination node are CCF or the IP multimedia system terminals in MGCF, the IP multimedia system.
Further, the initiation point of coding/decoding negotiation is supported the coding/decoding information that situation or front network are sent according to local encoding and decoding, structure coding/decoding negotiation message.
Compare and prior art, use the AMR coding/decoding negotiation of the inventive method in the IMS network succinct more efficient, can correctly finish the parametric description of AMR information in the IMS network, reduce unnecessary spending, finish the coding/decoding negotiation process of the whole network AMR fast, and the inventive method is simple, and is less demanding to system capability, workable.
Description of drawings
The step schematic diagram that Fig. 1 handles for the AMR coding/decoding negotiation in the IMS network of the present invention, OM information is carried by SDP.
The step schematic diagram that Fig. 2 handles for the AMR coding/decoding negotiation in the IMS network of the present invention, OM information is carried by the sip message head.
Embodiment
The present invention is the implementation method of the AMR coding/decoding negotiation in a kind of IMS network, the system that implements this method comprises: the initiation point of IMS AMR coding/decoding negotiation, IMS AMR coding/decoding negotiation intermediate node and IMS AMR coding/decoding negotiation destination node (following point, intermediate node and the destination node of be called for short initiating respectively), physically each node can be the CCF (CSCF), IP multimedia system (IMS) terminal etc. in MGCF (MGCF), the IP multimedia system (IMS).
According to actual needs, the negotiation of IMS AMR encoding and decoding can be consulted between two nodes, two nodes are respectively initiates point and destination node, also can consult between three or more node by intermediate node, and three nodes are respectively initiates point, intermediate node and destination node.
The method that realizes the AMR coding/decoding negotiation between two nodes in the IMS network may further comprise the steps:
Step 1: initiate point and send coding/decoding negotiation message, wherein comprise coding/decoding information and whether allow optimization information to destination node;
Step 2: after destination node receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the coding/decoding negotiation message of receiving, and reply the coding/decoding negotiation response message, carry amended coding/decoding information in this response message and whether allow optimization information;
Step 3: initiate to obtain the coding/decoding negotiation result after point receives the coding/decoding negotiation response message, finish coding/decoding negotiation and initiate coding/decoding negotiation process between point and the coding/decoding negotiation destination node.
The method that realizes the AMR coding/decoding negotiation between three nodes in the IMS network may further comprise the steps:
Step 1: initiate point and send coding/decoding negotiation message, wherein comprise coding/decoding information and whether allow optimization information to intermediate node;
Step 2: after intermediate node receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the coding/decoding negotiation message of receiving, and send coding/decoding negotiation message to destination node, the whether permission optimization information of wherein carrying the amended coding/decoding information of this intermediate node and determining;
Step 3: after destination node receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the coding/decoding negotiation message of receiving, and reply the coding/decoding negotiation response message and give intermediate node, the whether permission optimization information of wherein carrying the amended coding/decoding information of this destination node and determining;
Step 4: intermediate node transparent transmission coding/decoding negotiation response message is given and is initiated point, after the initiation point is received response message, obtain AMR coding/decoding negotiation result, finish the coding/decoding negotiation process between coding/decoding negotiation initiation point, coding/decoding negotiation intermediate node and the coding/decoding negotiation destination node one time.
Many coding/decoding informations and the whether permission optimization information corresponding respectively with these many coding/decoding informations can be arranged in coding/decoding negotiation message and the coding/decoding negotiation response message, and receiver side is revised and definite corresponding OM information these many coding/decoding informations according to local policy.
Below will " whether allow optimization information " and be called OM information, the OM information in the inventive method can realize by following dual mode:
Mode one: OM information is carried by the parameter among the Session Description Protocol message SDP, is exemplified below:
a＝fmtp:97mode-set＝0，2，5，7；OM＝YES；
Mode two: OM information is carried by the message header of conversation initiating protocol message SIP, hereinafter referred to as the OM header field, is exemplified below:
The message header field of SIP (Header Fields) part comprises that much From/to/Route etc., the OM of expansion are called the OM header field also in the header field part.
When OM or OM header field are " permission ", expression mode-set allows to be modified to it self subclass, that is to say, the node of expression transmission SDP Offer information is supported all subclass of the coding/decoding information among the mode-set, select for receiver side, receiver side can be deleted unsupported AMR speed from mode-set according to local policy.
When OM or OM header field during for " not allowing ", expression mode-set does not allow to be modified, that is to say, the node of expression transmission SDP Offer information is only supported the coding/decoding information complete or collected works among the mode-set, receiver side also must be supported this complete or collected works simultaneously, just can express support for this Media Stream, otherwise for not supporting; Be that subsequent node can not be revised codec parameters,, in response message, can directly remove this coding/decoding information if can not support this encoding and decoding fully.
When intermediate node or destination node are made amendment to coding/decoding information, if the OM information of receiving is for allowing, then intermediate node or destination node are deleted unsupported AMR speed according to local policy from coding/decoding information, as the OM information of receiving is not for allowing, and intermediate node or destination node can not be supported this encoding and decoding fully, then directly delete this coding/decoding information.
During information that intermediate node determines whether to allow to optimize, as the OM information of receiving is for allowing, and intermediate node only supports a certain subclass or the complete or collected works of encoding and decoding set in the coding/decoding information, and the OM information that then sends to destination node is not for allowing.
In the coding/decoding negotiation response message, OM fills in according to the destination node situation, owing to be negotiation result, general value is " not allowing ".
Below with the negotiation between three nodes be example at above dual mode, be described in detail respectively.
First execution mode:
AMR coding/decoding negotiation processing procedure in the IMS network, as shown in Figure 1, wherein OM information is carried by the parameter among the SDP, and this processing procedure may further comprise the steps:
Step 110:MGCF is as the initiation point of IMS AMR coding/decoding negotiation, support the coding/decoding information that situation or front network are sent according to local encoding and decoding, structure SDP Offer information sends, comprising information such as mode-set, mode-change-period, mode-change-neighbor, also comprise the OM parameter, represent whether this mode-set allows to revise.
Mode-change-period, mode-change-neighbor parameter are two parameters commonly used of AMR.
Wherein SDP Offer content is: a=fmtp:97 mode-set=a, b, c, d, e, f; OM=yes; ...
Above message content is represented: initiates point and supports a in 97 types, and b, c, d, e, all subclass of f promptly allow to revise.
The AMR information here also can be many, and promptly a plurality of a=rtpmap and a=ftmp are capable.
After step 120:CSCF receives SDP Offer information as the intermediate node of IMS AMR coding/decoding negotiation, determine whether to handle this SDP information as required, handle if desired, then according to network resource status, the signatory situation of user or operation needs etc., resolve SDP information, if OM revises for allowing, then from mode-set, delete unsupported AMR speed, and continue to transmit SDP Offer information.
Because of intermediate node is also supported a in 97 types, b, c, d, e, all subclass of f, so it is as follows to transmit above encoding and decoding message SDP Offer:
a＝fmtp：97?mode-set＝a，c，d，e，f；OM＝yes；...
If, then can not the mode-set value of an AMR inside be made any change, or all support, or just do not support this AMR for not allowing.
After step 130:UE receives SDP Offer information as the destination node of IMS AMR coding/decoding negotiation, support situation according to mode-set, mode-change-period, mode-change-neighbor, OM and local encoding and decoding, delete unsupported AMR speed, reply SDP Answer information, and OM among the SDP Answer is changed to do not allow to revise.
Destination node UE only supports a, c, and d, f, then the coding/decoding negotiation response message SDP Answer of Hui Fuing is:
a＝fmtp：97?mode-set＝a，c，d，f；OM＝No；...
After step 140:CSCF receives SDP Answer information, finish local the processing, SDP information is passed through MGCF.
Wherein: SDP Answer content is: a=fmtp:97 mode-set=a, c, d, f; OM=No; ...
After MGCF receives SDP Answer information, obtain the AMR encoding and decoding speed set among the mode-set, this set is that whole network comprises the coding/decoding negotiation result who initiates point and destination node, initiate point and determine information such as code/decode type that this session is used and speed according to concrete needs, coding/decoding negotiation is finished.
Release is finished or called out to the encoding and decoding of media stream code/decode for obtaining after consulting of communicating by letter between follow-up MGCF and the UE and using up to coding/decoding negotiation next time.
Below providing two application examples describes
Application example 1:
Initiate node and support in 97 types 0,2,5,7 complete or collected works and 1,4,5 complete or collected works of 98 types, and all do not allow to revise, then SDP Offer is:
| m＝audio?3456?RTP/AVP?97?98a＝rtpmap：97?AMRa＝fmtp：97?mode-set＝0，2，5，7；OM＝NO；。。。a＝rtpmap：98?AMRa＝fmtp：97?mode-set＝1，4，5；OM＝NO；。。。 |
If intermediate node or destination node are not supported in 97 types 0,2,5,7 complete or collected works, but support 98 type mode-set 1/4/5, but do not support the subclass of this mode-set, the Offer that then transfers or the Answer of response:
| m＝audio?3456?RTP/AVP?98a＝rtpmap：98?AMRa＝fmtp：97?mode-set＝1，4，5；mode-change-period＝2?OM＝NO； |
Application example 2:
Initiate node and support in 97 types all subclass of 0,2,5,7 promptly to allow to revise, but only support 1,4,5 complete or collected works of 98 types, do not allow to revise, then SDP Offer is:
| m＝audio?3456?RTP/AVP?97?98a＝rtpmap：97?AMRa＝fmtp：97?mode-set＝0，2，5，7；OM＝yes；。。。a＝rtpmap：98?AMRa＝fmtp：97?mode-set＝1，4，5；OM＝no；。。。 |
Intermediate node does not support in 97 types 0,2, but supports 5,7 complete or collected works of 97 types and 5,7 combination in any.Support 1,4,5 complete or collected works in 98 types, but can not support the subclass of 98 types, promptly do not support 1,4 or 4,5 combination, the Offer that then transfers:
| m＝audio?3456?RTP/AVP?97?98a＝rtpmap：97?AMRa＝fmtp：97?mode-set＝5，7；OM＝yes；。。。a＝rtpmap：98?AMRa＝fmtp：97?mode-set＝1，4，5；OM＝ON；。。。 |
That is to say that OM value and certain local policy according to 97 types revised mode-set, but OM remain unchanged.98 types according to certain local policy, are no longer supported the modification of subsequent node, and then revising OM is NO.
Second execution mode:
AMR coding/decoding negotiation processing procedure in the IMS network as shown in Figure 2, wherein the OM header field sends by sip message, this method may further comprise the steps:
Step 210:MGCF is as the initiation point of IMS AMR coding/decoding negotiation, support the coding/decoding information that situation or front network are sent according to local encoding and decoding, the structure sip message sends, comprise the OM header field in the message header, whether the mode-set parameter of the AMR encoding and decoding that provide in the expression message body allows to revise, message body content is a SDP Offer information, comprising information such as mode-set, mode-change-period, mode-change-neighbor.
Wherein, the sip message content is:
SIP/2.0...from：***?to：***...OM：yes
SDP?Offer(a＝fmtp：97?mode-set＝a，b，c，d，e，f；...)
After step 220:CSCF receives the sip message that comprises SDPOffer information as the intermediate node of IMS AMR coding/decoding negotiation, determine whether to handle this SDP information as required, handle if desired, then according to network resource status, the signatory situation of user or operation needs etc., resolve SDP information, if OM revises for allowing, then from mode-set, delete unsupported AMR speed, and OM information is set according to local policy.
In this example according to the local policy of intermediate node, the encoding and decoding complete or collected works after only supporting to consult, do not support subsequent node to the deleting once more of encoding and decoding, revise the OM header field for not allowing.Then the sip message content is:
SIP/2.0...from：***to：***...OM：No
SDP?Offer(a＝fmtp：97?mode-set＝a，c，d，e，f；...)
After step 230:UE receives the sip message that comprises SDP Offer information as the destination node of IMS AMR coding/decoding negotiation, support situation or carry out result behind the coding/decoding negotiation according to mode-set, mode-change-period, mode-change-neighbor and OM header field and local encoding and decoding with subsequent network, delete unsupported AMR speed, reply SDP Answer information, and OM in the message is changed to do not allow to revise, finish the coding/decoding negotiation process one time.
Wherein, the sip message content is:
SIP/2.0...from：***to：***...OM：No
SDP?Answer(a＝fmtp：97?mode-set＝a，c，d，e，f；...)
After step 240:CSCF receives the sip message that comprises SDP Answer information, handle according to normal sip message treatment principle, transparent transmission SDP information is given MGCF.After MGCF receives the sip message that comprises SDP Offer information, obtain the AMR encoding and decoding speed set among the mode-set,
Wherein, the sip message content is:
SIP/2.0...from：***to：***...OM：No
SDP?Answer(a＝fmtp：97?mode-set＝a，c，d，e，f；...)
This set is that whole network comprises the coding/decoding negotiation result who initiates point and destination node, initiates point and determines information such as the code/decode type of this session use and speed according to concrete needs, and coding/decoding negotiation is finished.Release is finished or called out to the encoding and decoding of media stream code/decode for obtaining after consulting of communicating by letter between follow-up MGCF and the UE and using up to coding/decoding negotiation next time.
Initiation point, intermediate network node and the destination node of coding/decoding negotiation also can be respectively CCF, the MGCF in IMS terminal, the IMS network.
Succinct more efficient by the AMR coding/decoding negotiation of this method in the IMS network, can correctly finish the parametric description of AMR information in the IMS network, reduce unnecessary spending, finish the coding/decoding negotiation process of the whole network AMR fast, and the inventive method is simple, less demanding to system capability, workable.
Claims (10)
1. the implementation method of a narrowband self-adaption multi-speed encoding/decoding negotiation, this method may further comprise the steps:
(a) the initiation point of coding/decoding negotiation sends coding/decoding negotiation message, wherein comprises coding/decoding information and whether allows optimization information;
(b) after the destination node of coding/decoding negotiation receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the message of receiving, and answer coding/decoding negotiation response message, carry amended coding/decoding information in this response message and whether allow optimization information, specifically comprise:, from coding/decoding information, delete unsupported speed according to local policy when the destination node of then receiving this message is revised this coding/decoding information if comprise the permission optimization information in the coding/decoding negotiation message; Do not allow optimization information if comprise in the coding/decoding negotiation message, and receive that the destination node of this message can not support this encoding and decoding fully, directly delete this coding/decoding information when then this destination node is revised coding/decoding information;
(c) after the initiation of coding/decoding negotiation point is received the coding/decoding negotiation response message, obtain the coding/decoding negotiation result, finish the coding/decoding negotiation process one time.
2. the method for claim 1 is characterized in that: coding/decoding negotiation is initiated point and is sent coding/decoding negotiation message to the coding/decoding negotiation destination node in the step (a); Coding/decoding negotiation destination node transmission coding/decoding negotiation response message is initiated a little to coding/decoding negotiation in the step (b), to initiate to carry out coding/decoding negotiation between point and the coding/decoding negotiation destination node at coding/decoding negotiation.
3. the method for claim 1, it is characterized in that: coding/decoding negotiation is initiated point and is sent coding/decoding negotiation message to the coding/decoding negotiation intermediate node in the step (a), and after the coding/decoding negotiation intermediate node receives coding/decoding negotiation message, message is decoded, and optimize according to whether allowing optimization information and local policy to revise coding/decoding information and determine whether to allow in the message of receiving, and send coding/decoding negotiation message to the coding/decoding negotiation destination node, the whether permission optimization information of wherein carrying the amended coding/decoding information of this intermediate node and determining; In the step (b), the coding/decoding negotiation destination node sends the coding/decoding negotiation response message to the coding/decoding negotiation intermediate node; The coding/decoding negotiation intermediate node receives that this message of coding/decoding negotiation response message transparent transmission of destination node is to initiating point, to initiate to carry out coding/decoding negotiation between point, intermediate node and the destination node at coding/decoding negotiation.
4. as each described method in the claim 1 to 3, it is characterized in that:, from coding/decoding information, delete unsupported speed according to local policy when the intermediate node of then receiving this message is revised this coding/decoding information if comprise the permission optimization information in the coding/decoding negotiation message; Do not allow optimization information if comprise in the coding/decoding negotiation message, and receive that the node of this message can not support this encoding and decoding fully, directly delete this coding/decoding information when then this node is revised coding/decoding information.
5. as each described method in the claim 1 to 3, it is characterized in that: comprise the permission optimization information in the coding/decoding negotiation message, and intermediate node is only supported a certain subclass or the complete or collected works of the set of encoding and decoding in the coding/decoding information, then sends to comprise in the coding/decoding negotiation message of destination node not allow optimization information.
6. as each described method in the claim 1 to 3, it is characterized in that: in the coding/decoding negotiation response message that the coding/decoding negotiation destination node is replied, carry the information optimized of not allowing.
7. as each described method in the claim 1 to 3, it is characterized in that: many coding/decoding informations and the whether permission optimization information corresponding respectively with these many coding/decoding informations are arranged in coding/decoding negotiation message and the coding/decoding negotiation response message.
8. each described method in the claim 1 to 3 is characterized in that: in the coding/decoding negotiation message whether allow optimization information to carry by the parameter in the Session Description Protocol message or the message header of conversation initiating protocol message carries.
9. as each described method in the claim 1 to 3, it is characterized in that: initiation point, intermediate network node and the destination node of coding/decoding negotiation is CCF or the IP multimedia system terminal in MGCF, the IP multimedia system.
10. as each described method in the claim 1 to 3, it is characterized in that: the initiation point of coding/decoding negotiation is supported the coding/decoding information that situation or front network are sent according to local encoding and decoding, structure coding/decoding negotiation message.
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| CN2007101879764A CN101330507B (en) | 2007-11-15 | 2007-11-15 | Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation |
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| CN1870649A (en) * | 2006-03-21 | 2006-11-29 | 华为技术有限公司 | Media consulation method, equipment and system |
| CN1933478A (en) * | 2005-09-17 | 2007-03-21 | 华为技术有限公司 | Media stream packet assembling time length consultation method |
| CN101052154A (en) * | 2007-05-11 | 2007-10-10 | 华为技术有限公司 | IP multimedia sub system and its coding and decoding switching control method |
| CN101060504A (en) * | 2007-04-13 | 2007-10-24 | 中兴通讯股份有限公司 | A method for negotiating the next generation of network media gateway fax switching mode |
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| CN1933478A (en) * | 2005-09-17 | 2007-03-21 | 华为技术有限公司 | Media stream packet assembling time length consultation method |
| CN1870649A (en) * | 2006-03-21 | 2006-11-29 | 华为技术有限公司 | Media consulation method, equipment and system |
| CN101060504A (en) * | 2007-04-13 | 2007-10-24 | 中兴通讯股份有限公司 | A method for negotiating the next generation of network media gateway fax switching mode |
| CN101052154A (en) * | 2007-05-11 | 2007-10-10 | 华为技术有限公司 | IP multimedia sub system and its coding and decoding switching control method |
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