Patent ID: 7974256

Claim:
A radio communication system comprising a plurality of radio communication apparatuses on a radio network connecting the radio communication apparatuses wherein, each of the radio communication apparatuses comprises: a buffer storing data to be transmitted on the radio network; and an access setting unit configured to: prescribe a super frame period within a predetermined time period; set a reserved period within the super frame for accessing the radio network, wherein the super frame includes a media access slot, reservation control information including a reservation type block, and a reason code type block, the reservation type block including a code identifying a type of reservation and the reason code including a code value used to adjust a reservation; set a network allocation vector to prevent one of the radio communication apparatuses to communicate on the radio network until communication between additional radio communication apparatuses terminates, wherein a first type of network allocation vector is set when a clear to send or request to send signal is detected, and a second type of network allocation vector is set based on the media access slot when a predetermined amount of data larger than a threshold amount is concentrated to a specific buffer of a respective radio communication apparatus; determine a priority status of the data stored in the buffer, the priority status being determined according to a measurement of the amount of data stored in a buffer for each respective radio communication apparatus; and select either a first reservation setting method not contending with reservation setting by another radio communication apparatus when the predetermined amount of data larger than the threshold amount is concentrated to the specific buffer, or a second reservation setting method possibly contending with reservation setting by another radio communication apparatus when data is not concentrated to a specific buffer of a respective radio communication apparatus.