Wireless ATM network access and control

Abstract

Wireless Asynchronous Transfer Mode (ATM) networks are attractive because they can provide a wide variety of new wireless broadband services providing true portability and support for personal, integrated broadband services currently envisioned for wired ATM systems only. A wireless ATM access network has to provide a reasonable user-transparent Quality of Service (QoS) for different service classes as well as seamless integration across an interconnection of wireless and wired ATM networks. A Medium Access Control (MAC) protocol has been designed, which allows seamless integration of the wireless access segments to the wired ATM network and takes into consideration the characteristics of the various classes of service to provide good QoS. This protocol is based on the Time Division Multiple Access with Dynamic Reservation (TDMA/DR) protocol. The performance of the MAC protocol is studied: a) by computer simulation for voice, Markov Modulated Poisson Process (MMPP) or Motion Picture Experts Group (MPEG) video and data traffic; b0 by mathematical analysis for delay-sensitive voice and MMPP video traffic.

This research work is also concerned with the Connection Admission Control (CAC) and the Usage Parameter Control (UPC) issues in a cellular wireless ATM access network. The proposed two CAC approaches are based on equivalent capacity for heterogeneous traffic. The performance of one of these approaches is studied by mathematical analysis and the other approach by computer simulation. The UPCs used to police the heterogeneous traffic are leaky buckets with the token generation rates set at the equivalent capacities of the heterogeneous traffic. The performance of the UPC is studied by computer simulation for heterogeneous traffic and mathematical analysis for voice and MMPP video traffic.