| 摘要 |
PROBLEM TO BE SOLVED: To provide a data communication method between a roaming radio device and a network access gateway.SOLUTION: Communication data between a radio device 101 and a gateway 103 is organized in a packet format including a first internal header and a second external header. The radio device 101 transmits at least one predictable field from fields in the external header and fields in the internal header to a gateway 103 (310), receives at least one predictable field in the external header from the gateway 103 (410), deletes the external header and the internal header of a data packet (302), generates, in the data packet, a header that includes at least one unpredictable field from the fields in the internal header and is at a level lower than a network layer (303), and transmits the generated data packet to the gateway 103 (304).SELECTED DRAWING: Figure 3 |
