Patent ID: 7769414
Filing Date: 2010-08-03
Classification: G06F,H04W,Y02D

Abstract:
1. A power saving mode control system of a base station in a wireless portable network system, comprising: a message receiver for receiving a sleep mode request message from the subscriber station; a message parser for parsing the sleep mode request message and extracting a minimum sleep interval, a maximum sleep interval, and a subscriber station identifier; a grouping controller for determining a sleep mode entering time of the subscriber station which has requested the sleep mode based on the minimum sleep interval and the maximum sleep interval in order to group listening intervals of a plurality of subscriber stations and align them; a memory for storing sleep mode information on the grouped subscriber stations; and a message transmitter for reporting the minimum sleep interval, the maximum sleep interval, and the sleep mode enter time to the subscriber station which has requested the sleep mode, wherein the grouping controller is configured to determine the sleep mode entering time to be a frame when a remainder obtained by dividing a frame number of said frame by a maximum sleep interval align window size managed by the system becomes the minimum sleep interval.