Patent ID: 7920882
Filing Date: 2011-04-05
Classification: H04W

Abstract:
1. A wireless input unit of human interface device for communicating data with a host digital terminal, the wireless input unit comprising at least one emergency channel, one occupancy channel, and at least one unoccupied channel, transmission and reception channels of each channel using the same frequency band as employing a time divisional two-way communication scheme; wherein the wireless input unit comprises an operation active mode for transmitting operation data generated by an internal operation of the wireless input unit through the occupancy channel, a standby mode for maintaining a lower power state than the operation active mode and sensing an interference on the occupancy channel, and a channel setup mode for communicating data used to set up the occupancy channel through the emergency channel and setting up the new occupancy channel; wherein when there is no interference on the occupancy channel, the wireless input unit communicates the operation data with the host digital terminal through the occupancy channel, and when there is interference on the occupancy channel, the wireless input unit communicates data that includes substitute channel information to set up a new occupancy channel as the occupancy channel with the host digital terminal through the emergency channel; and wherein when the operation data is not generated in a predetermined time, the wireless input unit enters into the standby mode and sends a standby mode setup command setting up the standby mode to the host digital terminal through the occupancy channel.