A general packet radio service (GPRS) system includes radio network controllers (RNC), support nodes (SGSN) and a gateway node (GGSN) connected in a hierarchical order for packet transmission between mobile stations in the system. Each of each RNC, each SGSN and GGSN has a communication path controller to return the request of coupling toward subordinate node or controller if the subordinate mobile stations include the destination mobile station. Accounting for the packet service is based on the return of the packets.