Patent ID: 6956829
Filing Date: 2005-10-18
Classification: H04B,H04W

Abstract:
1. A method for measuring a propagation delay value of a frame transmitted by a UE (User Equipment) to a Node B in a TDD (Time Division Duplexing) mobile communication system including a frame divided into two sub-frames, each of the sub-frames having a plurality of time slots and also having a downlink pilot time slot and an uplink pilot time slot, both intervening between a first time slot and a second time slot of the plurality of time slots, the system also including the Node B for transmitting the frame fixed to a time axis, and the UE for transmitting a propagation-delayed frame in response to the frame received from the Node B, the method comprising the steps of: acquiring synchronization with the Node B based on a downlink pilot channel signal transmitted in a period of the downlink pilot time slot, and determining an estimated round trip delay value T transmitting an uplink pilot channel signal by applying the estimated round trip delay value T receiving a transmission point correcting value T transmitting a physical random access channel (PRACH) message with the estimated round trip delay value T