Cellular-Concept PPT PDF
Cellular-Concept PPT PDF
Cellular-Concept PPT PDF
Topics
• Cellular system fundamental, frequency reuse,
channel assignment, handoff
• Interference and system capacity, Improving
system capacity and cell coverage.
Cellular System fundamentals
• Cellular technology aims at achieving high system
capacity with limited radio spectrum.
The MSC can route voice calls through the public switched
telephone network (PSTN) and it can also provide Internet
access.
Frequency Reuse
Cell splitting and sectoring are the two cellular design techniques for increasing
system capacity and improving coverage
Cell splitting subdivides a congested cell into smaller cells, each with its own base
station and a corresponding reduction in antenna height and transmitter power.
In the sectoring approach, omni directional antennas at the base station are
replaced by directional antennas, each radiating in a specific sector
sectoring
Cell splitting
Channel assignment
N i 2 ij j 2
D R
n n
S R
First tier of interfering cells NI
I NI
iD n
i D / R 3N