Analysis of Random Access Protocol and Channel Allocation Schemes for Service Differentiation in Cellular Net works
Mario E. Rivero-Ángeles, Izlian Y. Orea-Flores · 2013
In this work, the effect of the channel allocation scheme on the priority based Slotted ALOHA (S-ALOHA) random access protocol when blocked packets return to the network is presented. Service differentiation is co nsidered for high and low priority users. Priority based S-ALOHA is i mplemented using a Geometric Backoff (GB) scheme by means of two retransmission probabilities. Two channel al location schemes that implement priority queues for service differentiation in a TDMA based cellular network ar e considered: Bitmap Channel Allocation (BCA) and Uplink State Flag Channel Allocation (USFCA). In order to improve the system performance, new packet transmissions for low priority packets are differed (DFT) effectively inc reasing the throughput on the random access channel and reducing the average waiting time and access delay.