A simulation study of using reservation-virtual time CSMA for packet voice in mobile radio

The reservation-virtual time-CSMA protocol has been simulated in a mobile radio environment. R-VT-CSMA offers fairness to users in a FCFS sense, since initial transmissions are based upon packet arrival times. Packet delay is very important for voice, but R-VT-CSMA achieves a bounded access time by discarding packets that are not transmitted within one frame time after their arrival. The implicit reservation scheme ensures that only a small percentage of packets are lost at non-overload conditions. To reduce packet loss in a fading radio environment when using R-VT-CSMA, the transmitting mobile should retransmit its packet if it is detected in error on channel F₂, and also the base station should append its VT clock lag factor to the packet trailer