Mode transition method for wireless data service in a mobile station

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:

• detecting at least one predetermined indicator bit over at least one time slot on a forward wake-up channel, assigned to the mobile station in the control hold mode;
• 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.