Patent ID: 8300574

Claim:
An establishment method of uplink synchronization based on joint transmission technology used in a mobile communication system, comprising the following steps of: (a) performing channel estimation for a downlink channel close to an uplink channel by user equipment; (b) determining a transmission timing for transmission signals of an uplink synchronous time slot by user equipment; (c) constructing a transmission matrix A and a matrix d that is related to signals originally intended to be sent by user equipment based on downlink channel estimation result; (d) solving d=Ae+n by user equipment, obtaining a converted signal e, wherein n is a noise matrix; (e) using the converted signal e to replace an original uplink synchronous sequence for transmission by user equipment, and using the transmission timing determined in step (b) when transmitting; (f) estimating uplink signals received from the uplink channel through a correlator by a base station, obtaining a timing of uplink signals and deducing time adjustments needed to be performed by user equipment to reach uplink synchronization; (g) instructing user equipment to complete adjustments for the transmission timing of uplink signals based on time adjustments provided by a network, and adjusting the transmission timing of uplink signals by user equipment, achieving establishment of uplink synchronization.