Method and apparatus for measuring downlink synchronization in wireless communication system

A user equipment (UE) for achieving downlink synchronization in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit to transmit and receive a radio signal;
• and
• a processor connected to the RF unit,
• wherein the processor is configured to:
• transmit a preamble for requesting a synchronization signal transmission resource to a base station (BS);
• and
• receive a response signal to the preamble from the BS,
• wherein the response signal comprises location information on a synchronization signal transmission resource for a neighboring BS,
• wherein the UE is in a state of not establishing a connection with the BS and synchronizing in downlink with the BS, and
• wherein the response signal further comprises transmission period information on a synchronization signal, and the method further comprises detecting the synchronization signal for a time indicated by the transmission period information on the synchronization signal.