Patent ID: 8358587
Filing Date: 2013-01-22
Classification: H04W

Abstract:
1. A system for performing a local wireless communication using a predetermined frequency band, the system employing frequency-variable signal detection, wherein at least a part of the predetermined frequency band is divided into a plurality of channels, the system comprising: at least a hub scanning each channel to identify available one of the plurality of channels, modulating data, and transmitting the modulated data over the available channel; and a plurality of sensors communicating with the hub, each sensor being set to start to operate when each sensor detects a signal in said predetermined frequency band, spectrum-sensing the signal of the frequency band for each channel, analyzing a header of packet data for each channel, and receiving and processing the packet data if the signal is identified to have a designated code, each sensor including a band detector, a processor, and a frequency-variable detecting unit, wherein: the band detector detects in real time a frequency band of a signal received from the hub, and only when the frequency band of the received signal is detected by the band detector to be within said predetermined frequency band,