Abstract: Based on the analyses of the typical channel allocation schemes such as FRA (fixed resource allocation) and DRA (dynamical resource allocation) for GSM/GPRS (global system for mobile communications/general packet radio service) networks, an improved channel allocation scheme, DMC_ DRA, was proposed, and its performances were analyzed. The new scheme may dynamically changes the minimumnumber of channels for a GPRS packet. In thisway a compromise between FRA and DRAmay be achieved to have better comprehensive performances such as channel utilization efficiency, packet transfer time and call blocking probability.