A method for preventing a call of packet data from colliding in a WLL
system is disclosed, by which the packet transmission times of respective
terminals are allocated using random numbers. The method includes
initializing the random number and a call connecting time and
transmitting packet data to a Radio Port (RP) after the initialization is
completed. New and unique random numbers are assigned to the respective
terminals based on the packet data transmitted from the terminals. The
packet data is transmitted to the RP at the call connecting times
corresponding to the random numbers.