A novel multiple access control (MAC) protocol——User-dependent Perfect-scheduling Multiple Access (UPMA) protocol
which supports joint transmission of voice and data packets
is proposed.By this MAC protocol
the bandwidth can be allocated dynamically to the uplink and downlink traffic according to their respective service requirements.UPMA protocol endows different priority levels to different types of traffic
and can perfectly schedule the transmission of mobile terminals (MTs) by means of polling.Meanwhile
a unique frame structure is designed to guarantee that the voice traffic is always transmitted prior to the data traffic.Furthermore
an effective collision resolution algorithm is proposed to guarantee rapid channel access for activated MTs.Finally
performance of UPMA protocol is evaluated by simulation and compared with that of MPRMA protocol.Simulation results show that UPMA protocol has better performance.