Patent ID: 8724539

Claim:
A wireless communication system wherein packet transmission operations are carried out in an infrastructure mode, said wireless communication system comprising: a first terminal station serving as a data transmission source; a second terminal station serving as a data receiving destination; and a control station configured to contain each terminal station and relay a packet transmitted between the two terminal stations, wherein said first terminal station sends a direct link test request to said second terminal station via said control station, and following receiving a confirmation response as to said direct link test request from said second terminal station via said control station, directly sends test packets to address of said second terminal station, wherein said second terminal station records information comprising a number of test packets received from said first terminal station or receiving power thereof, and sends a report packet with said recorded information written therein to said first terminal station via said control station, wherein said first terminal station performs evaluation of a direct link between said first terminal station and said second terminal station, based on said recorded information written in said report packet, and wherein said first or second terminal stations employ Qos Null Embedding Management Action which is defined in IEEE 802.11n-D1.0 to encapsulate a data-type frame and send said direct link test request or said confirmation response thereto.