Patent ID: 8774159
Filing Date: 2014-07-08
Classification: H04B

Abstract:
1. A first communication apparatus that belongs to a first communication system having a highest-priority with respect to using a frequency band including a first sub-frequency band and a second sub-frequency band, the first communication system being one of a plurality of communication systems coexisting on the same communication medium, each of the plurality of communication systems having a given predetermined priorities with respect to using the frequency band, an upper limit and a lower limit of the frequency band being respectively defined as F_MAX and F_MIN, the first communication apparatus comprising: a coexistence signal generator that selects, out of a plurality of candidates, F_BOUND a coexistence signal transmitter that transmits the coexistence signal to another communication system of the plurality of communication systems, wherein the first sub-frequency band is usable by the first communication system or the other communication system, and the second sub-frequency band upper than the first sub-frequency band is usable only by the other communication system.