IP over wireless mobile ATM-guaranteed wireless QoS by HiperLAN/2

Wireless local a, ea networks (WLANs) designed as wireless ATM systems to e xtend the services of fixed ATM networks to mobile users appear best suited to provide a guaranteed quality of service (QoS) for wireless IP networks. HiperLAN/2 is an ETSI/BRAN standard providing convergence layers for both IP and ATM classes of service. Besides a description of Hiper LAN/2 and its Home Environment Extension, the performance for IP traffic flows is presen ted from analysis and from simulating a prototype implementation. Col exist ence with the IEEE 802. 11a WLAN is discussed and the ability of HiperLAN/2 to guarantee QoS even when coexisting is analyzed. Ad hoc networking of Hi perLAN/2 is analyzed and two possible extensions of the system are introduc ed and their performance evaluated, namely adaptive antennas and wireless b ase stations.