The Fundamentals of Cellular Concept and System Design

Wireless Communications 06-88-440-01

These slides contains copyrighted materials from Prentice Hall Inc.. These figures are provided as instructor resources, and sources of these figures are:Wireless Communications and Networking, Jon W. Mark, Weihua ZhuangWireless Communications: Principles and Practice, Theodore S. Rappaport

Single Cell

K Channels = K simultaneous UsersCapacity=K

BS

Pr

Pt

d

P r=PtG /d K

M Small CellsCapacity= M x K

Interference if all cells use same set of frequencies

R

R

R

1 2

3

Which cell to use?

Single Cell

Single Cell with K channels Cluster N cells, with Each cell J = K / N channels

Cellular Concept

19-cell reuse example (N=19)

Handoffs – the basics

Umbrella Cells

Smaller N is greater capacity

D=R3N

Co-channel cells for 7-cell reuse

Key Definitions for Trunked Radio

Erlang B Trunking GOS

Erlang B

Erlang C

Cells are split to add channels with no new spectrum usage

Cell Splitting increases capacity

Sectoring improves S/I

Sectoring improves S/I

In-building deployment is the next great growth phase

The Zone Cell Concept

Zone Cell Concept