Method of uplink synchronization establishment based on the united transmission technology
AssigneeZte Corporation
InventorMeiling Ding
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Abstract
An establishment method of uplink synchronization based on the joint transmission technology utilizes channel symmetry and channel time correlation of the downlink and the uplink in TDD mobile communication system, and then applies the joint transmission technology in the uplink synchronization establishment process in a TDD mobile communication system, and based on the simple processing performed by UE, the base station can accurately detect the timing of uplink signals by performing related calculations. The present invention has fundamentally solved the problem of low probability of success in uplink synchronization establishment.
Claims12
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.
Dependencies are inferred from the claim text.