FLEXIBLE RESOURCE-ALLOCATION SCHEME FOR GSM DATA SERVICES

In GSM High Speed Circuit Switched Data (HSCSD), the data rate can be increased by using multiple time slots instead of single time slot. Mu ltiple time-slot assignment results in high blocking rate. To accommod ate more users, flexible resource allocation strategies have been prop osed. Since GSM follows TDMA/FDMA, the channels (time slots) in a base station are segmented by frequency carriers. The base station must al locate the channels which belong to the same frequency carrier to indi vidual requests. This Flexible Resource Allocation scheme for GSM (FRA -GSM) is contrastive to the scheme proposed in our previous studies wh ere a base station may arbitrarily allocate idle channels in the base station to incoming requests. We de fine satisfaction indication SI as the measurement to compare the performance of these schemes. Experime nt results indicate that FRA-GSM scheme has good performance when the user mobility is high, or when some cost factors are taken into accoun t.