Abstract: When an access point receives radio waves from a GPS satellite and acquires its own position information, it sends a beacon signal containing the acquired information to a PC over a wireless LAN. If the PC receives the beacon signal containing the position information from the access point, it starts initializing the wireless LAN function of the PC. Specifically, the PC analyzes the position information sent from the access point, derives a region to which the position indicated by the position information belongs, and updates the setting information in a flash memory so as to conform to the radio communication standard of the derived region. At the same time, the updated setting information is set onto the operations (frequency band, transmission power) of the wireless LAN card.

Abstract: An electronic device comprises an antenna, a first wireless communication module coupled to the antenna, which is complied with a first communication protocol, a second wireless communication module coupled to the antenna, which is complied with a second communication protocol, and a filter coupled to the antenna, the first wireless communication module, and the second wireless communication module. The filter distributes a signal received by the antenna to one of the first wireless communication module and the second wireless communication module in accordance with frequency of the signal.

Abstract: A base band unit of a radio communication module has basic functions for radio communications in accordance with a Bluetooth(R) protocol. Furthermore, the base band unit has a function of calculating the throughput of radio communications on the basis of a bit error rate (BER) and computing reception sensitivity on the basis of a signal-to-noise ratio (SNR). The base band unit monitors radio communications for their quality using the throughput calculated on the basis of the BER or the reception sensitivity computed on the basis of the SNR. If the base band unit determines that the communication quality is high, it instructs an RF unit to reduce dispatch power required to transmit data. On the other hand, if the base band unit determines that the communication quality is low, it instructs the RF unit to increase the dispatch power required to transmit data.

Abstract: When an access point receives radio waves from a GPS satellite and acquires its own position information, it sends a beacon signal containing the acquired information to a PC over a wireless LAN. If the PC receives the beacon signal containing the position information from the access point, it starts initializing the wireless LAN function of the PC. Specifically, the PC analyzes the position information sent from the access point, derives a region to which the position indicated by the position information belongs, and updates the setting information in a flash memory so as to conform to the radio communication standard of the derived region. At the same time, the updated setting information is set onto the operations (frequency band, transmission power) of the wireless LAN card.

Abstract: A personal computer system comprises a notebook type personal computer and an expansion device to which the personal computer is removably docked. The expansion device comprises a wired LAN interface. The personal computer comprises a wireless communication interface, a docking detector, and a device driver communicating with another device by the LAN interface when docking is detected, and by the wireless communication interface when undocking is detected.