2 General

3GPP45.002GSM/EDGE Multiplexing and multiple access on the radio pathRelease 17TS

The radio subsystem is required to support a certain number of logical channels that can be separated into two categories as defined in 3GPP TS 44.003:

i) the traffic channels (TCH’s);

ii) the control channels.

More information is given about these logical channels in clause 3 which also defines a number of special channels used by the radio sub‑system.

Clause 4 of this document describes the physical resource available to the radio sub‑system, clause 5 defines physical channels based on that resource and clause 6 specifies how the logical channels shall be mapped onto physical channels. Figure 1 depicts this process.

With the Flexible Layer One (FLO), the radio subsystem is required to support transport channels (see 3GPP TR 45.902). Clause 8 of this document describes the mapping and multiplexing principles that are specific to FLO. Because FLO offers transport channels instead of logical channels, any reference to logical channels, with the exception of SACCH, does not apply to FLO. Otherwise, and unless otherwise stated, the multiplexing principles described in this document are equally applicable to FLO (e.g. physical resource and physical channels).