Patent ID: 8355716

Claim:
A communication system wherein: non-periodical data communications are carried out between an information transmitting terminal and one or more information receiving terminals; said information transmitting terminal periodically broadcasts network control information to said information receiving terminals; each of said information receiving terminals receives said network control information from said information transmitting terminal at a rate determined in advance; each of said information receiving terminals receives said network control information from said information transmitting terminal in an information acquisition period; and specific ones of said information receiving terminals each arbitrarily shift the starting point of said information acquisition period of said specific information receiving terminal; and wherein: each individual one of said information receiving terminals has a power save mode for reducing the power consumption of said individual information receiving terminal by carrying out an intermittent operation to make a transition from a doze state in which operations of at least some circuit modules of said individual information receiving terminal are stopped to an awake state in which said individual information receiving terminal is functioning fully and vice versa; and in said power save mode, said individual information receiving terminal makes a transition from said doze state to said awake state with a timing adjusted to said information acquisition period of said individual information receiving terminal to receive said network control information from said information transmitting terminal.