Mobile Switching Center Emulation Speech Codec Negotiation
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Solution Overview
Problem
In mobile communication systems with CDMA modulation, the speech codec negotiation process during call setup increases system cost and connection duration due to the need for bearer updates when the preferred codec of the calling user is not supported by the called user, leading to unnecessary codec changes and transcoder usage.
Innovation Solution
A method and system where a mobile switching center emulation receives an originating call signal, retrieves the latest speech codec list from a database, and determines the codec to be used based on the supported codecs of both users, eliminating the need for bearer updates by pre-selecting a compatible codec from the intersection set of supported codecs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the called user selects a non-preferred codec from the calling user's codec list, then codec compatibility is improved, but a bearer update process is added increasing connection duration
Solution Approach 1:
The mobile switching center performs preliminary codec selection by determining the intersection set of supported codecs between calling and called users before establishing the call. This preliminary action identifies compatible codecs in advance, allowing the called user to select from pre-determined compatible options without triggering subsequent bearer updates, thus resolving the contradiction between compatibility and connection speed
2Adaptability or versatility
If the mobile switching center inserts a speech transcoder when codec lists don't intersect, then codec compatibility is improved, but system cost increases
Solution Approach 1:
The mobile switching center performs preliminary determination of the intersection set of supported codecs between calling and called users before call establishment. By identifying compatible codecs in advance through this preliminary action, the system可以避免 inserting speech transcoders, thereby maintaining codec compatibility while reducing system cost and complexity
Data Source
AI summary
The embodiments of the present invention disclose a method for speech Codec negotiation in a communication system in which a calling user initiates the speech Codec negotiation with a called mobile station. The method includes: receiving by a mobile switching center emulation in the communication system an originating call signal from a calling user, the originating call signal carrying a number of a called mobile station; obtaining a latest speech Codec list used by the called mobile station from a database storing mobile station information in accordance with the number of the called mobile station; determining a speech Codec to be used in a communication between the calling user and the called mobile station; and establishing a voice bearer in the speech Codec for the calling user and the called mobile station. The method avoids a bearer update process and improves switching speed. In addition, the embodiments of the present invention also disclose a system and a device for speech Codec negotiation in a communication system.