Multiple access control protocol for integrated isochronous and bursty data services

A novel multiple access control (MAC) protocol (CHARISMA) is introduced for integrated wireless voice and data services on the uplink channel in a cellular wireless network. The CHARISMA protocol is motivated by the fact that previous protocols ignore the burst errors of the channel due to fading and shadowing. As such, the physical layer of the proposed system is a variable-rate adaptive channel encoder and modulator and thus the instantaneous offered throughput to the MAC layer is variable depending on the current channel state. Given the channel state information provided by the physical layer, priority is given to those mobile terminals with better channel states. Selection diversity is achieved through gathering a large set of new and queued requests such that requests with good channel states can be identified. The multiple access performance of the proposed MAC protocol is compared with traditional TDMA-based MAC algorithms and the RMAV protocol. Extensive simulation results indicate that significant improvements in terms of throughput, delay, and packet loss probability are achieved using the CHARISMA protocol