Access delay analysis of adaptive traffic load - type protocols for S-ALOHA and CSMA in EDGE

This article presents a mathematical analysis of the access delay in the adaptive traffic load (ATL) protocol. The basic idea of the ATL protocol is to limit the number of packet transmission for both new and backlogged users, in order to avoid collisions and keep the system stability. For this purpose, all users have an authorization probability to transmit which depends on the system traffic load. By using ATL protocol for high traffic loads, we maintain the throughput constant at its maximum value regardless of the traffic load of the system. Additionally in ATL, access delay is a linear function of the traffic load, meanwhile in conventional access protocols it is an exponential function. Additionally, we consider the EDGE (enhanced data for GSM evolution) frame structure and slot duration. EDGE is proposed as the evolution of TDMA based second generation networks to offer packet data transmission in order to provide the 3G services.