What is unique about wireless?

νDifficult media

interference and noise

quality varies over space and time

shared with “unwanted” 802.11 devices

shared with non-802 devices (unlicensed spectrum, microwave ovens)

νFull connectivity cannot be assumed

“hidden node” problem

νMobility

variation in link reliability

battery usage: requires power management

want “seamless” connections

νSecurity

no physical boundaries

overlapping LANs

νMultiple international regulatory requirements

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt

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© Siemens, 2002

 

 

 

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Siemens IEEE802.11 manual What is unique about wireless?