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Table 1 Allocated HiperLAN<br />
bands (in Europe) [1]<br />
Figure 2 Cellular and<br />
ad-hoc network topologies<br />
for HiperLAN/2<br />
74<br />
Frequency band RF Power limit Comments<br />
5.150 GHz – 5.250 GHz 200 mW mean EIRP Indoor use only<br />
5.250 GHz – 5.350 GHz 200 mW mean EIRP Indoor use only and implementation of<br />
DFS 1) and TPC 2)<br />
5.470 GHz – 5.725 GHz 1 W mean EIRP Indoor and outdoor use and implementation<br />
of DFS and TPC<br />
A new WLAN standard, HiperLAN type2,<br />
which does not suffer the shortcomings of the<br />
802.11 in regard to QoS, has recently been published.<br />
The remainder of this article will focus<br />
on this technology and aims to give an overview<br />
of HiperLAN/2 as well as explore its capabilities<br />
with particular emphasis on its MAC protocol.<br />
2 HIPERLAN/2 Overview<br />
HIPERLAN/2 is a wireless LAN standard being<br />
developed by ETSI, where the core components<br />
have been finalised in 2000. The standard will<br />
give high data rates (up to 54 Mbit/s on the<br />
physical layer) for short range (
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