| CPC H04W 74/0891 (2013.01) | 11 Claims |
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1. A method of operating a communication system using physical layer division, the method comprising:
extracting an initial random access signal from an uplink signal, in a first physical layer of a first communication node of the communication system;
reducing a data amount of the extracted initial random access signal in the first physical layer;
transmitting the initial random access signal with the reduced amount of data from the first communication node to a second communication node of the communication system; and
calculating a time synchronization error between the first communication node and the second communication node using the initial random access signal with the reduced amount of data, in a second physical layer of the second communication node,
wherein the calculating of the time synchronization error comprises:
calculating a first time offset using the initial random access signal with the reduced amount of data;
restoring the initial random access signal with an original amount of data by using the initial random access signal with the reduced amount of data;
calculating correlation values between the initial random access signal with the reduced amount of data and a plurality of random access sequences;
searching for a random access sequence having a maximum correlation value, among the calculated correlation values, from among the plurality of random access sequences; and
calculating a second time offset as the time synchronization error based on a point at which a correlation value of the restored initial random access signal and the random access sequence having the maximum correlation value becomes maximum within a reference range from the first time offset.
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