Patent ID: 7058431

Claim:
A radio terminal comprising: means for performing power-save operations by intermittently activating a radio communication module for performing radio communication with a radio base station; end-to-end delay acquisition means for periodically measuring the end-to-end delay time, which is the delay time required for end-to-end transmission and reception; activation period notification packet transceiving means for both transmitting an activation period notification packet for reporting its own activation period to the terminal of a communication partner and receiving activation period notification packets from the terminal of a communication partner; and activation period modification determination means for directing said activation period notification packet transceiving means to transmit an activation period notification packet to the terminal of a communication partner when the end-to-end delay time that has been measured by said end-to-end delay acquisition means is equal to or greater than a standard value that has been set in advance, comparing the activation period that has been reported from the terminal of a communication partner by means of an activation period notification packet with its own activation period, and performing a modification to shorten its own activation period when its own activation period is equal to or greater than the activation period of the terminal of the communication partner.