METHOD AND APPARATUS FOR CONTROLLING TDMA NETWORK SYNCHRONIZATION BY USING LOOPBACK

摘要

PURPOSE: A method and an apparatus for controlling TDMA network synchronization by using a loopback are provided to prevent burst collision and accurately transmit a burst at allocated timing. CONSTITUTION: A traffic earth station obtains Dn through an RB(Reference Burst) received from a reference earth station after satellite delay time(16), and calculates TBT(Transmit Burst Timing) by using Dn(17). The traffic earth station transmits an initial TB at time allocated by a satellite A traffic base station transmits an SB(Short Burst), generating a timing margin as much as (TB-SB), and calculates a TBT again by allocating the timing margin by half before and after a burst(18). The traffic base station transmits the SB at an early stage by using the obtained TBT(19). After the satellite delay time, receive timing of the SB is calculated after an RFT to obtain an RBT(Receive Burst Timing)(6). The traffic earth station stores its TB-allocated timing as a BTF information in a memory, and obtains an error between the RBT value and the BTP value(8). A TBT can be obtained by subtracting the error value from the previous TBT value.