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TRAUFrom Wikipedia, the free encyclopedia

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Transcoder and Rate Adaptation Unit, or TRAU , performstranscodingfunction for speech channels

and RA (Rate Adaptation) for data channels in the GSM network. The Transcoder/Rate Adaptation Unit

(TRAU) is the data rate conversion unit. The PSTN/ISDN switch is a switch for 64 kbps voice. Current

technology permits to decrease the bit-rate (in GSM radio interface it is 13 kbit/s for full rate and 6.5 kbit/s

for half rate). Since MSC is basically a PSTN/ISDN switch its bit-rate is still 64 kbit/s. That is why a rate

conversion is required in between the BSC and MSC

Transcoding is the compression of speech data from 64 kbit/s to 13/12.2/5.6 kbit/s in case FR/EFR/HR

(respectively) speech coding.

Brief Explanation[edit source|editbeta]

For an MS-to-MS call, the transmission path covers the radio access network (RAN) as well as the core

network (CN). Since the transmission modes and coding standards are different for RAN and CN, speech

data is converted/transcoded at the transition points from RAN to CN. This conversion is performed in the

TRAU network element which connects RAN and CN.

13 kbit/s for FR (Full Rate), Redundancy (Channel Coding)= 9.8 kbit/s

=> Gross data rate after adding redundancy = 22.8 kbit/s

= 12.2 kbit/s for EFR (Enhanced Full Rate), Redundancy (Channel Coding)= 10.6 kbit/s

=> Gross data rate after adding redundancy = 22.8 kbit/s (same as FR) TRAU changes the bit rate of

16kbit/s of the BSS side to 64kbit/s of NSS side.

= 5.6 kbit/s for HR (Half Rate), Redundancy (Channel Coding)= 5.8 kbit/s

=> Gross data rate after adding redundancy = 11.4 kbit/s

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See also[edit source|editbeta]

Full Rate

Half Rate

Enhanced Full Rate

Adaptive Multi-Rate

TRAU was also the term used for the frame format used in transport of the compressed bits from these

speech coders.

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