AN ADAPTIVE OPERATION OF SPEECH CODER IN BASE STATION FOR SERVICE OF MOBILE STATIONS WITH DIFFERENT TYPE SPEECH CODERS

摘要

PURPOSE: A method of operating a base station voice coder for a service of a mobile terminal mounting different voice coders is provided to allocate a voice coder in a call between a fixing terminal and a mobile terminal, and to operate a bypass mode when voice coding systems of calling/called mobile terminals are the same in a call between a mobile terminal and a mobile terminal, then to operate a double vocoding mode when the voice coding systems are not the same. CONSTITUTION: A voice coder of a base station receives data relating to a call type and a voice coder type from a voice coder control processor. The voice coder checks whether the data is a call between a mobile terminal and a fixing terminal. If so, the voice coder activates a voice coder same as a voice coder of the mobile terminal. If the call is between a mobile terminal and a mobile terminal, the voice coder checks whether voice coders mounted on transmitting/receiving mobile terminals are the same. If so, voice coders allocated in the base station bypass a packet of the transmitting mobile terminal to a voice coder of the receiving mobile terminal. If the voice coders of the transmitting/the receiving terminals are not the same, the voice coders make voice coders same as the voice coders of the transmitting/the receiving terminals allocated in the transmitting/the receiving terminals, and make the voice coders operate in a double vocoding operation mode.