FIELD: radio engineering, communication.
SUBSTANCE: invention relates to synchronisation in sleep mode in a wireless communication system. A method of operating a mobile station in sleep mode state includes: if a traffic indication message and unicast data are not received during a listening window, transmitting one of a request message and a header to a base station to request a location of a next-scheduled listening window, and if a response for the one of the request message and the header is received, performing synchronisation for a next sleep cycle.
EFFECT: controlling synchronisation when a traffic indication message is not received in a wireless communication system.
38 cl, 14 dwg, 6 tbl
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