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<p>Each user transmits periodically for less than one-eighth of the time within one of the eight timeslots. Since the users are at various distances from the base station and radio waves travel at the finite <a href="page.php?w=speed_of_light">speed of light</a>, the precise arrival-time within the slot can be used by the base station to determine the distance to the mobile phone.  The time at which the phone is allowed to transmit a burst of traffic within a timeslot must be adjusted accordingly to prevent collisions with adjacent users. Timing</p><p>
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