Siemens IEEE802.11 - Manual (Page 27)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 27 © Siemens, 2002
… when will 5 GHz WLANs come?
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IEEE802.11b (2.4 GHz) is now taking over the market.
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There are developments to enhance IEEE802.11b for
– more bandwidth (up to 54 Mbit/s)
– QoS (despite many applications do not need QoS at all)
– network issues (access control and handover).
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5 GHz systems will be used when the 2.4 GHz ISM band
will become too overcrowded to provide sufficient
service.
– TCP/IP based applications are usually very resilient
against ‘error proune’ networks.
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Issues of 5 GHz systems:
– Cost: 5 GHz is more expensive than 2.4 GHz
– Power: 7dB more transmission power for same distance
– Compatibility to IEEE802.11b/g necessary