SYSTEM AND METHOD FOR COMMUNICATING COGNITIVE RADIO NETWORK

摘要

PURPOSE: A recognition wireless network communication method and a system thereof are provided to measure idle time of a first network from terminals of a second network to generate probability distribution and limit an interference frequency in the first network with a specific probability. CONSTITUTION: A wireless terminal of a secondary network measures idle time of a first network(112). The wireless terminal sets an observation section(114). The wireless terminal operates a histogram in the set observation section(116). The wireless terminal obtains probability distribution of the idle time(118). The wireless terminal transmits the maximum value among histogram observation section values to an access point(120). The wireless terminal selects the minimum value among the maximum values transmitted from at least two wireless terminals(122). The wireless terminal initiates a contention section according to calculated maximum transmission enable time(124,126). [Reference numerals] (110) Monitoring occupation time for each network channel of a specific adjacent network based on information of a MAC frame header of a frame transmitted from AP; (112) Measuring idle time for which data transmission for each network channel is stopped according to a predetermined period; (114) Setting an observation section by multiples of a contention slot; (116) Operating a histogram; (118) Obtaining a probability distribution; (120) Transmitting the maximum value to the AP; (122) Selecting the minimum value among the maximum values received from a wireless terminal; (124) Calculating the maximum transmittable time; (126) Opening a contention section; (AA) Start; (BB) End