Peter May

IEEE 802.11e - fair resource sharing between overlapping basic service sets

The upcoming IEEE 802.11e is an extension of the 802.11 wireless local area network (WLAN) standard. We use this new standard with its priority provisioning mechanism to address fairness issues that occur when geographically co-located WLANs share the radio channel in the so-called overlapping basic service set environment. By allowing a new mechanism that is part of the 802.11e, called EDCF-TXOP bursting, we show that WLANs will gain from intelligent radio resource control in a fair manner. A WLAN that applies EDCF-TXOP bursting can significantly improve its performance compared to a WLAN that does not utilize EDCF-TXOP bursting.

A decentralized reservation scheme for IEEE 802.11 ad hoc networks

As the market for wireless local area networks (WLANs) based on IEEE 802.11 addresses no longer only the business market but also the home user, new demands for WLANs emerge. Multimedia applications require support for quality of service (QoS), which is addressed by the upcoming IEEE 802.11. For the satisfaction of the home user these wireless ad hoc networks must support multihop communication. The centralized prioritizing mechanism of the hybrid coordination function (HCF) relies on an infrastructure of hybrid coordinators (HCs) which may not be available in the home environment. Thus we provide a new decentralized reservation scheme to prioritize data in 802.11 and present simulation results.

Wireless ATM LAN with and without infrastructure

A wireless ATM LAN framework architecture designed to support wireless ATM communications in environments with and without fixed ATM infrastructure is described. For the configuration with ATM infrastructure a distributed ATM switching backbone is proposed, which allows a smart ATM switching element to be embedded into the wireless access point. The same embedded ATM switch technique is used to realise forwarding and interworking nodes in an adhoc wireless ATM LAN which is proposed to combat the weakness of CSMA-based systems such as HIPERLAN and IEEE802.11.