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ETSI TS 146 041
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ETSI TS 146 041 Digital cellular telecommunications system (Phase 2+); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels (3GPP TS 46.041 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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Full Description
The present document gives a description of the general baseband operation of half rate speech traffic channels in thetransmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during DiscontinuousTransmission (DTX).For clarity, the description is structured according to the block diagrams in figures 1 and 4. Except in the case describedbelow, this structure of distributing the various functions between system entities is not mandatory for implementation,as long as the operation on the air interface and on the speech decoder output remains the same.
In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), theimplementation of the interfaces between the DTX Handlers and the Radio Sub System (RSS) as described in thepresent document together with all their flags is mandatory, being a part of the A-bis interface as described inGSM 08.61 [10].
The DTX functions described in the present document are mandatory for implementation in all GSM MSs. The receiverrequirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those wheredownlink DTX will be used.