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GSM Logical Channels
TCH
Traffic
TCH/H
TCH/F
CCCH
Control
BCH DCCH
FCCH
SCH
BCCH
PCH
RACH
AGCH
CBCH
SDCCH
SACCH
FACCH
• Two types of logical channel are defined; traffic and control channels
• Each is further sub-divided as shown:
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Types of Sites:
1. Single Site
a) GSM – 900 / GSM – 1800 (DCS)
b) Single BCCH
2. Dual Band / BCCH Sitea) GSM – 900 + GSM – 1800
b) Dual BCCH
3. Concentric Site
a) GSM – 900 & GSM – 1800
b) Single BCCH
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Traffic Handling:
• Speech Codec's can be used to avoid initial congestion
• Expansion is the final Solution
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