Logical Channel:
Control Channel:
Traffic channels (TCH) are used to carry voice
or data:
-Typically uses one time slot per
frame
-Gross data rate per TCH: 22 kbps
Effective data rate lower because of forward
error correction
Logical Channel Summary (2G):
Channel Combination:
The different logical channel
types mentioned are grouped into what are called channel combination. The four
most common channel combinations
are listed below:
1. Full
Rate Traffic Channel Combination – TCH8/FACCH + SACCH
2. Broadcast
Channel Combination – BCCH + CCCH
3. Dedicated
Channel Combination – SDCCH8 + SACCH8
4. Combined
Channel Combination – BCCH+CCCH+SDCCH4+SACCH4
5. Half
Rate Traffic Channel Combination – TCH16/FACCH + SACCH
The Half Rate Channel
Combination (when introduced) will be very similar to the Full Rate Traffic
Combination.
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