Patent ID: 7050821
Filing Date: 2006-05-23
Classification: H04W

Abstract:
1. Digital radio communications apparatus comprising: a base unit; a local handset communicable with said base unit; and a distant handset communicable with said base unit, wherein said local handset comprises: a radio section for performing radio communications; a base unit communications controller for performing radio communications with said base unit; a direct inter-handset communications controller for performing direct radio communications between handsets; a direct inter-handset communications transition controller for making control to establish direct inter-handset communications while maintaining communications with a base unit as well as transmitting control channels for direct inter-handset communications in vacant slots in the receiving time zones for communications with said base unit; and a basic controller for controlling the components of the local handset; and said distant handset comprises: a radio section for performing radio communications; a base unit communications controller for performing radio communications with said base unit; a direct inter-handset communications controller for performing direct radio communications between handsets; a direct inter-handset communications transition controller for making control to establish direct inter-handset communications while maintaining communications with said base unit as well as scanning control channels for direct inter-handset communications in the time zones other than the slots occupied by communications with said base unit; and a basic controller for controlling the components of the distant handset.