METHOD AND SYSTEM FOR CHANGING PREAMBLE IN MOVING NETWORK SYSTEM

摘要

PURPOSE: A preamble change method in a portability network system is provided to prevent communication disconnection by alternately transmitting preamble using a preamble change system. CONSTITUTION: A base station selects a relay varying a preamble. The relay alternately transmits a signal using a first preamble and a signal using a second preamble with a plurality of terminals receiving a control of the relay'(703). The relay decides a preamble change completion of all terminals(707). If the preamble change of all terminals is completed, the relay transmits only a signal, which uses a second preamble, to terminals.