Transmission of comfort noise parameters during discontinuous transmission
First Claim
1. A method for transmitting comfort noise (CN) parameters in a digital mobile station that operates in a discontinuous transmission (DTX) mode, comprising the steps of:
- generating a comfort noise parameters message in response to a voice activity detector detecting an absence of speech; and
transmitting the comfort noise parameters message from the mobile station to a base station by concatenating the comfort noise parameters message with another message that is scheduled for transmission to the base station.
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Accused Products
Abstract
A comfort noise block, that include a hangover period and comfort noise parameters, is transmitted in such a manner that it is not interrupted by other messages, such as FACCH messages. This is accomplished in a mobile station by a determination of whether any FACCH messages are required to be transmitted. If such FACCH messages exist, a further determination may be made as to which transmission can be made in the shortest time (i.e., the FACCH message or messages or the comfort noise parameters message), and this transmission is made first. In any event the comfort noise parameters block is transmitted without interruption. In a further embodiment of this invention the comfort noise parameters message is transmitted by being concatenated with another message, such as a neighbor channel measurement results message, so as to reduce overhead, conserve bandwidth, and reduce power consumption. An element of the comfort noise parameters message is a Random Excitation Spectral Control (RESC) information element, which is used in the decoder for improving the spectral content of the generated comfort noise so as to better match the background noise at the transmitter.
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Citations
7 Claims
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1. A method for transmitting comfort noise (CN) parameters in a digital mobile station that operates in a discontinuous transmission (DTX) mode, comprising the steps of:
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generating a comfort noise parameters message in response to a voice activity detector detecting an absence of speech; and
transmitting the comfort noise parameters message from the mobile station to a base station by concatenating the comfort noise parameters message with another message that is scheduled for transmission to the base station. - View Dependent Claims (2, 3, 4)
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5. A mobile station operative with a base station, said mobile station comprising:
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a transmitter;
an input speech transducer;
a voice activity detection (VAD) function coupled to said speech transducer; and
a controller having an input coupled to an output of said VAD function, to an output of said speech transducer, and to an input of said transmitter, said controller being responsive to said VAD function indicating an absence of user speech for initiating a Discontinuous Transmission (DTX) mode of operation and for transmitting at least one comfort noise (CN) block, the comfort noise block being comprised of a hangover period following a detected absence of speech and comfort noise parameters, said controller being operative for transmitting the comfort noise parameters message from the mobile station to the base station by concatenating the comfort noise parameters message with another message transmitted over a control channel to the base station.
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6. A method for transmitting comfort noise (CN) parameters in a digital mobile station that operates in a discontinuous transmission (DTX) mode, comprising the steps of:
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generating a comfort noise parameters message in response to a voice activity detector detecting an absence of speech; and
transmitting the comfort noise parameters message over a traffic channel by using Digital Control Channel (DCCH) channel coding and intraslot interleaving, thereby enabling the comfort noise parameters message to be transmitted in one time slot from the mobile station to a base station. - View Dependent Claims (7)
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Specification