Wireless local area networks (WLANs) designed as wireless ATM systems to extend 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 HiperLAN/2 and its Home Environment Extension, the performance for IP traffic flows is presented from analysis and from simulating a prototype implementation. Coexistence 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 HiperLAN/2 is analyzed and two possible extensions of the system are introduced and their performance evaluated, namely, adaptive antennas and wireless base stations.

The mobile radio systems beyond third generation (3G) will evolve in all-IP systems, integrating Internet and mobile systems advantages. BRAIN project is developing a system architecture which combines local coverage broadband radio access systems based in HIPERLAN/2 with several wider coverage mobile radio systems, enabling full coverage of seamless IP-based services for users in hot spot areas and on the move. End to end quality of service (QoS) provision is one of the mayor challenges in the design of such a system and must be supported by the application, network and wireless access layers. This paper proposes a QoS system architecture, including the terminal architecture, the IP based access network and the main characteristics of the enhancements to the air interface based in HIPERLAN/2 focusing on its wireless QoS support.

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