Patent ID: 6239690
Filing Date: 2001-05-29
Classification: H04B,H04W,Y02D

Abstract:
A method of battery economizing in a communications system comprising a transmitting station and a receiving station having a radio identity code consisting of M bits, said method comprising the transmitting station transmitting a wake-up message comprising at least two repetitions of a wake-up sequence, the wake-up sequence comprising N concatenated parts, where N is an integer greater than one, each of said N parts including a sync code word and a different fraction M/N of bits of a radio identity code of a receiving station, the receiving station being energized intermittently in order to detect at least one of said parts, the receiving station remaining energized when at least one of said parts is detected and said at least one of said parts is analyzed, and the receiving station being de-energized in response to determining that the received bits of the transmitted radio identity code do not correspond to the corresponding bits of the receiving station's radio identity code.