User's Manual

SME VoIP System Guide, Version 2.6
Proprietary and Confidential
Chapter:
Appendix C: SME VoIP Network Planning/Optimization
117
Overlaps are necessary to maintain seamless handover and to establish synchronization chains. A good
example may be a cafeteria during lunch hour where temporary concentrations of handsets may occur. The
overlap carries the excess call load to adjacent Base stations to provide uninterrupted services to
subscribers.
12.4 Cell Coverage / Capacity Planning
12.4.1 Cell Coverage
Due to the unexpected nature of RF propagation in an indoor environment, an actual on-site test must be
performed before the deploying and/or installing core network elements. An extensive guide to effective
RF coverage planning is outside the scope of this document. This should be noted:
The Base stations provides typical RF coverage of up to 50 meters/164 feet in a typical indoor office
environment and up 300 meters/984 feet in an open area (line-of-sight-LOS), extending in all directions
from the Base stations (i.e. Omni directional). The exact coverage range depends on the building
architecture, wall material and surroundings. The figure below show the correct installation of base stations
spaced at the recommended distances from each other:
Typically, installations such as office buildings, hotels and hospitals should be equipped with both base
stations and repeaters on several floors to create uniform and complete radio coverage.
Open areas can be covered with a sparse network of base stations. In such deployments, the base stations
and/or repeaters cover an extended range due to the extended line-of-sight radio propagation capability
The figure below shows an example of an installation where base stations are not spaced at the right
distances: