Packet delivery method for packet radio networks

A packet delivery method for packet radio networks, adapted to deliver packets between a first mobile station and a second mobile station in a packet radio network, where the first mobile station connects to the packet radio network through a first base station system (BSS) and the second mobile station connects to the packet radio network through a second base station system (BSS), comprising the steps of:

• a linking step, to establish a bidirectional communication between the first mobile station and the second mobile station by method of a GGSN;
• a notifying step, to provide a second SGSN servicing the second mobile station with a first SGSN's address and a first linking identifier of the first mobile station and to provide first SGSN servicing for the first mobile station with the second SGSN's address and a second linking identifier of the second mobile station;
• and
• a bidirectional communication step, to communicate between the first mobile station and the second mobile station through the first SGSN and the second SGSN, respectively, wherein when the first mobile station has a plurality of data packets to the second mobile station, the first mobile station first sends the data packets to the first BSS in the first SGSN, the first SGSN then forwards the data packets to the second SGSN by checking the first linking identifier, and the second SGSN finally forwards the data packets to the second mobile station through the second BSS by checking the first linking identifier;
• when the second mobile station has a plurality of data packets to the first mobile station, the second mobile station first sends the data packets to the second BSS in the second SGSN, the second SGSN forwards the data packets to the first SGSN by checking the second linking identifier, the first SGSN finally forwards the data packets to the first mobile station through the first BSS by checking the second linking identifier;
• and the GGSN sends a plurality of signal packets to maintain and end the data packets communicated between the first mobile station and the second mobile station.