Patent ID: 7715426

Claim:
A communication device performing access control in a network constituted of a plurality of communication devices such that communication timing of a packet will not collide with communication timing of another device by detecting a signal transmitted from another device, the communication device comprising; a transmission and reception unit configured to transmit a request-to-send packet to a second communication device in the network, receive from the second communication device a request-to-send acknowledgement response packet relative to the request-to-send packet, transmit a data packet to the second communication device in response to reception of the request-to-send acknowledgement response packet, and receive from the second communication device a packet concerning a reception acknowledgement response relative to the data packet; and a control unit configured to write a first duration in the request-to-send packet, wherein the first duration indicates a first period of time until reception of the request-to-send acknowledgement response packet is completed and a second duration in the data packet, wherein the second duration indicates a second period of time until reception of the packet concerning the reception acknowledgement response relative to the data packet is completed, and wherein based on the first duration and the second duration, a third communication device in the network is prohibited from performing transmission processing.