For battery economizing in a receiving station (CU) having a radio identity code (RIC) consisting of M bits, a base station (MIU) transmits a wake-up message consisting of at least two repetitions of a wake-up sequence having N concatenated parts. Each of the N parts includes a sync code word and a different...http://www.google.es/patents/US6239690?utm_source=gb-gplus-sharePatente US6239690 - Battery economizing in a communications system
