For a system with tn physics channels, in,, channels are shared
by voice and GPRS services and in,! channels are dedicated to
GPRS (Fig. 1). In the pool of tnv channels, when channels are
not used by voice services, those channels are used for GPRS
transmission. The voice services own preemptive priority over
GPRS, i.e., whenever channels used by the GPRS service are
needed by voice services, the GPRS transmission in those
channels is stopped until some channels are available for
GPRS. The users interrupted service have higher priority for
resource allocation than those in queue.