Patent ID: 6346873
Filing Date: 2002-02-12
Classification: H04Q

Abstract:
A parent node for use in a communication system that has a parent node and a plurality of child nodes, the plurality of child nodes being able to communicate in a first mode in which a child node can communicate with said parent node when said child node receives a first message to recognize existence of a transmission request to be transmitted from said parent node, said parent node comprising:transmission means for transmitting a second message that said parent node announces to said child nodes that the parent node is saving power; power saving means for performing the power saving when the second message is transmitted; and communication means for communicating with said child node in a second mode in which said child node can communicate regardless of not having received the first message when said parent node is saving power, in response to said parent node communicating with said child node in the second mode, other child nodes return to the first communication mode.