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Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation
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A technology of self-adaptive multi-rate and implementation method, which is applied in voice analysis, instrumentation, digital transmission system, etc., can solve the problems of insufficient codec negotiation, etc., and achieve AMR codec negotiation that is simple and efficient, simple in method, and reduces overhead Effect
Inactive Publication Date: 2011-11-30
ZTE CORP
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Codec negotiation cannot be adequately performed without using these extensive SDP information descriptions
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no. 1 approach
[0061] The AMR codec negotiation process in the IMS network, such as figure 1 As shown, the OM information is carried by parameters in the SDP, and the processing process includes the following steps:
[0062] Step 110: MGCF, as the initiation point of IMS AMR codec negotiation, constructs SDP Offer information transmission according to the local codec support or the codec information sent from the front-end network, including mode-set, mode-change-period, and mode -change-neighbor and other information, including OM parameters, indicating whether the mode-set allows modification.
[0063] The mode-change-period and mode-change-neighbor parameters are two common parameters of AMR.
[0064] The SDP Offer content is: a=fmtp: 97 mode-set=a, b, c, d, e, f; OM=yes;...
[0065] The above message content indicates that the originating point supports all the subsets of a, b, c, d, e, and f in the 97 type, that is, modification is allowed.
[0066] The AMR information here may also be multiple...
no. 2 approach
[0091] The AMR codec negotiation process in the IMS network is as follows figure 2 As shown, the OM header field is sent by SIP message, and the method includes the following steps:
[0092] Step 210: MGCF, as the initiation point of the IMS AMR codec negotiation, constructs a SIP message to send according to the local codec support or the codec information sent from the front-end network. The message header includes the OM header field, which means the information provided in the message body Whether the mode-set parameters of the AMR encoding and decoding are allowed to be modified, the message body content is the SDP Offer information, which includes information such as mode-set, mode-change-period, and mode-change-neighbor.
[0096] Step 220: After the CSCF, as the intermediate node of the IMS AMR codec negotiation, receives the...
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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 [0001] The present invention relates to an IP multimedia system (IMS), in particular to a method for implementing narrowband adaptive multi-rate (Adaptive Multi-Rate AMR-NB, hereinafter referred to as AMR) voice codec negotiation in an IMS network. Background technique [0002] IMS was introduced in the 3GPP R5 version and superimposed on the packet domain network. It consists of functional entities such as call control function (CSCF), media network management control function (MGCF), media resource control function (MRF), home subscriber server (HSS), etc. composition. Among them, MGCF realizes the intercommunication function between IMS network and other networks. In the IMS network, SIP (Session Initiation Protocol) / SDP (Session Description Protocol) is used as control plane signaling. [0003] Narrowband adaptive multi-rate (Adaptive Multi-Rate AMR-NB) voice codec, including 8 different rate codecs, through dynamic adjustment between different rates to achiev...
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