Patent ID: 7269145

Claim:
A method for determining, by a mobile station, whether a base station has data to transmit during a data service, where the mobile station is in a control hold mode in a data non-transmission period, and returns to an active mode in a data transmission period, the method comprising the steps of: receiving a control message designating at least one time slot on a forward wake-up channel, assigned to the mobile station in the control hold mode, from the base station during call setup for the data service, wherein the control message includes an information field for indicating the forward wake-up channel among a plurality of forward channels and an information field for indicating a position of the assigned slot on the forward wake-up channel, detecting at least one predetermined indicator bit over the time slot on the forward wake-up channel; monitoring a control channel from the base station in order to determine whether to transit to the active mode if the at least one indicator bit indicates that the base station has data to transmit; and returning to the active mode in order to receive data from the base station if a unique ID (Identification) of the mobile station is detected from the monitored control channel.