3.5 Data channel at half rate, 6.0 kbit/s radio interface rate (4.8 kbit/s services (TCH/H4.8))

3GPP45.003GSM/EDGE Channel codingRelease 17TS

The definition of a 6.0 kbit/s radio interface rate data flow for data services is given in 3GPP TS 44.021.

3.5.1 Interface with user unit

The user unit delivers to the encoder a bit stream organized in blocks of 60 information bits (data frames) every 10 ms. Four such blocks are dealt with together in the coding process, {d(0),d(1),…,d(239)}.

For non‑transparent services those four blocks shall align with one complete 240‑bit RLP frame.

3.5.2 Block code

The block encoding is done as specified for the TCH/F9.6 in subclause 3.3.2.

3.5.3 Convolutional encoder

The convolutional encoding is done as specified for the TCH/F9.6 in subclause 3.3.3.

3.5.4 Interleaving

The interleaving is done as specified for the TCH/F9.6 in subclause 3.3.4.

3.5.5 Mapping on a Burst

The mapping is done as specified for the TCH/FS in subclause 3.1.4. On bitstealing for signalling purposes by a FACCH, see subclause 4.3.5.