Patent ID: 8059681

Claim:
A method of transmitting and receiving a packet over a radio channel in a mobile communication system, the method comprising: in a transmitting apparatus, receiving one or more first packets from an upper layer; generating a second packet, that includes the first packets; and transmitting the generated second packet over the radio channel, wherein generating the second packet comprises: inserting one or more first information fields indicating sizes of the first packets excluding a last one of the first packets into a header of the second packet; and in a receiving apparatus, receiving over the radio channel a third packet, into which one or more of the fourth packets are included; calculating a size of a last one of the fourth packets by using a size of the third packet, a size of a header of the third packet, and one or more second information fields indicating sizes of the fourth packets excluding the last one of the fourth packets inserted in the header of the third packet, and separating the fourth packets from the third packet by using the calculated size of the last one of the fourth packets; and forwarding the separated fourth packets to the upper layer.