Wireless LAN Planning and Configuration. MIS 4700 Dr. Garrett. Wireless Design Considerations. Planning & Design Issues. RF design issues WLAN site qualification Capacity and coverage WLAN mode and topology Existing network issues. RF Design Issues.
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The bandwidth of an 802.11b signal fades as its distance increases.
Independent Basic Service Set (IBSS)
Used by ad-hoc
Basic Service Set (BSS)
Used by Infrastructure
Extended Service Set (ESS)
Used by InfrastructureWLAN Mode & Topology
An ad-hoc WLAN is created from two or more IBSS devices.
A BSS requires the inclusion of an access point (base station).
Multiple access points in a single WLAN create an ESS topology.
A screenshot of the AirMagnet Surveyor site survey software. Image courtesy of AirMagnet, Inc.
A handheld WLAN spectrum analyzer. Photo courtesy of Rohde & Schwarz GmbH & Co. KG
A handheld special-purpose site survey device. Photo courtesy of Berkeley Varitronics Systems, Inc.
Overlapping the RF ranges of wireless access points in a WLAN ensures coverage throughout an area.
Most wireless NICs are shipped with monitoring and configuration software.
The signal strength display of the AirMagnet Surveyor site survey software. Image courtesy of AirMagnet, Inc.
Disconnects from one cell to establish a connection to the next cell in an overlapping manner
Devices adjust their transceiver to the frequency and channel of the strongest signalWireless Roaming
WLAN devices roam between wireless access points seeking an open channel on which to associate.
The 802.11b frequency channels defined for the U.S. and Canada.