Patent ID: 8594033
Filing Date: 2013-11-26
Classification: H04W

Abstract:
1. A frequency band coordination method in a cognitive radio system wherein each of a plurality of autonomous radio communication apparatuses has a hash function in common, each radio communication apparatus acting as a transmitting node when transmitting and acting as a receiving node when receiving, the method comprising: an information obtaining step, by one said radio communication apparatus acting as a transmitting node, of obtaining the radio communication apparatus's own location information and current time information; a range limiting step, by the one said radio communication apparatus acting as the transmitting node and another said radio communication apparatus acting as a receiving node, of narrowing a frequency range down using the obtained location information, time information and the hash function; a detection step, by each of the transmitting node and the receiving node, of detecting usable frequency bands in the narrowed frequency range; a request transmission step, by the transmitting node, of transmitting a connection request using the usable frequency bands; a response transmission step, by the receiving node, of transmitting an acknowledgement response in a frequency band in which the receiving node has received the connection request; and a selection step, by the transmitting node, of selecting, as a control channel, any one of frequency bands in which the transmitting node has received the acknowledgement response.