| 摘要 |
PURPOSE: A method for transceiving emergent data by using a slot removing-type protocol is provided to transmit periodic data in ordinary times and to transmit emergent data as removing a slot in an emergency. CONSTITUTION: When a subscriber terminal is powered on(1), a system sets a reference timer(2), and decides whether a slot starts(3). If so, the system initializes a slot timer(5). If a subscriber is in an emergency(6), the system informs other subscribers of the emergency(7). If the subscriber is not in the emergency, the system decides whether the slot timer is bigger than an RF delay time(8). If so, the system delays time(10), and checks an RF signal(11). If the RF signal is generated less than 4 times, the system confirms a current slot(12), and decides whether the current slot is assigned to the subscriber(13). If so, the system transmits periodic data in a general transmission mode(14).
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