Patent ID: 6990117

Claim:
A CSMA wireless LAN comprising: a base station; a plurality of terminal stations; antenna means provided in the base station for receiving signals from the plurality of terminal stations; terminal station identifier means provided in the base station for determining whether there are at least two transmitting terminal stations of the plurality of terminal stations in response to signal receptions by the antenna means, at least one of the transmitting terminal stations being a hidden terminal station; power notifying means provided in the base station for notifying the at least one of the transmitting terminal stations to increase a transmitting power when it is determined by the terminal station identifier means that there are at least two transmitting terminal stations the antenna means having a plurality of antenna elements; monitor means provided in the base station for monitoring a received power of each antenna element; wherein the terminal station identifier means determines whether there are at least two transmitting terminal stations based on comparisons of the received power of each antenna element monitored by the monitor means with a reference power.