Patent ID: 7280507

Claim:
A radio LAN data transmission system, comprising: a host station, a relay station having a plurality of access points, and a mobile station having a radio LAN apparatus that transmits data to and receives data from the host station via the relay station, wherein the radio LAN apparatus includes a memory unit that temporarily stores transmission data that is data to be transmitted to an access point; and a memory control unit that provides a control to store the transmission data in the memory unit at the time of switching from one access point to another access point, and to transmit the transmission data to the another access point when the radio LAN apparatus establishes a communication link with the another access point; wherein a desired one of the access points includes a storage unit that temporarily stores input data; and a data smoothing unit that smoothes the input data to generate output data while the input data is being read from the storage unit and each access point includes: a memory monitoring unit that outputs a completion signal to an access point other than the one access point, when reading of all the data stored in the storage unit has finished; and a completion signal detecting unit that detects a completion signal output from a memory monitoring unit of an access point other than the one access point.