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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 speech analysis, digital transmission system, instrument, etc., can solve the problem of insufficient codec negotiation, etc., and achieve simple and efficient AMR codec negotiation, reduce overhead, and be operable strong effect
Inactive Publication Date: 2008-12-24
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 in , where the OM information is carried by parameters in the SDP, the process includes the following steps:
[0062] Step 110: MGCF, as the initiator of IMS AMR codec negotiation, constructs and sends SDP Offer information according to the local codec support status or the codec information sent by the front-end network, including mode-set, mode-change-period, mode -change-neighbor and other information, also includes OM parameters, indicating whether this mode-set allows modification.
[0063] The mode-change-period and mode-change-neighbor parameters are two common parameters of AMR.
[0064] The content of SDP Offer is: a=fmtp:97mode-set=a, b, c, d, e, f; OM=yes;...
[0065] The content of the above message indicates: the originating point supports all subsets of a, b, c, d, e, and f in the 97 types, that is, modification is allowed.
[0066] The AMR information here may also be multi...
no. 2 approach
[0091] The AMR codec negotiation process in the IMS network is as follows: figure 2 As shown, wherein the OM header field is sent through a SIP message, the method includes the following steps:
[0092] Step 210: MGCF serves as the initiation point of IMS AMR codec negotiation, according to the local codec support status or the codec information sent by the front-end network, constructs a SIP message to send, and the message header includes the OM header field, indicating that the message body provides Whether the mode-set parameter of the AMR codec is allowed to be modified, the content of the message body is the SDP Offer information, including mode-set, mode-change-period, mode-change-neighbor and other information.
[0096] Step 220: After receiving the SIP message containing the SDPOffer information as the intermediat...
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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 multimediasystem (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] Introduced in 3GPP R5, IMS is superimposed on the packet domain network and consists of call control function (CSCF), media network managementcontrol function (MGCF), media resource control function (MRF), home subscriber server (HSS) and other functional entities composition. Among them, the MGCF realizes the intercommunication function between the 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 codec methods, through dynamic adjustment between different rates to achi...
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