LTE system synchronizing method under discontinuous receiving mode

Abstract

The invention relates to an LTE system synchronizing method under a discontinuous receiving mode, in particular to an LTE system synchronizing method. The method comprises the step one of beginning receiving data, wherein a user terminal device begins receiving co-frequency data within preset time according to subframe positions on radio frames where paging information needing to be monitored is located; the step two of estimating time offset and frequency offset, wherein first-class pilot signals or second-class pilot signals are read from the co-frequency data according to different channel bandwidths for estimating the time offset and the frequency offset; the step three of determining the initial position for reading off-line data according to the time offset, and correcting the frequency offset of the off-line data; the step four of carrying out setting on a tuning unit according to the estimated time offset and the frequency offset, and correcting time offset and frequency offset of follow-up received data. The synchronizing scheme supports TDD / FDD LTE systems, the synchronizing time for UE each time an IDLE wakes up can be greatly shortened, the method can be used for reducing the power consumption of the UE, and stand-by time for the UE is prolonged.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to an LTE system synchronization method. Background technique [0002] LTE (Long Term Evolution, Long Term Evolution Project) is the largest technology research and development project launched by 3GPP (3rd Generation Partnership Project, Third Generation Partnership Project) in recent years. It is a high data rate, low delay and full packet-based mobile Communication system; in order to reduce the power consumption of mobile terminals, the discontinuous reception power saving mechanism is introduced in the LTE system; when the UE (User Equipment, user equipment) is on standby, the UE will be in the IDLE (idle) state DRX (Discontinuous Reception, Discontinuous reception) mode in order to save power for the UE. In this mode, the UE needs to wake up periodically to monitor the paging information of the base station. [0003] Due to high-speed movement or physical dev...

AI Technical Summary

Problems solved by technology

[0003] Due to high-speed movement or physical devices, mainly related to the stability and accuracy of the crystal oscillator, when the UE wakes up after sleeping, there will be a certain time offset and frequency offset when receiving data. When the time offset and frequency offset are large It will affect the UE receiving data

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