Synchronization method and device after terminal dormancy awaken of TD_SCDMA mobile phone

Abstract

The invention relates to a method for making TD-SCDMA mobile phone and base station synchronously, wherein it comprises that: receiving descending guide time-slit data sent from receiving base station; matching said received data with local data, to obtain the peak position of time-slit data in signal channel; calculating out the difference between peak position and ideal synchronous position; based on said difference, confirming the synchronous time difference between mobile phone and base station; based on said time difference, adjusting the initial position when receiving next frame, to be synchronous with base station. The invention also provides relative synchronous device, which comprises receiver, matcher, calculator, corrector, and synchronous unit.

Description

technical field [0001] The invention relates to a synchronization technology between a terminal and a base station in the field of mobile communication, in particular to a method and a device for synchronizing a TD-SCDMA mobile phone terminal with a base station after being awakened from sleep. Background technique [0002] In the TD-SCDMA mobile communication system, the mobile phone terminal needs to improve the standby time of the whole terminal by reducing the power consumption of the terminal. The mobile terminal completes the measurement and monitoring tasks in the idle state without receiving and sending messages, which is what we often call the standby state. And there will be a lot of idle time between measurement and monitoring, in order to achieve the purpose of power saving, make the processor enter the sleep state during these idle time. [0003] However, after a long period of sleep, the terminal and the base station will lose contact and synchronization due t...

AI Technical Summary

Problems solved by technology

Therefore, the channel impulse response calculated according to the training sequence of the midamble code is actually composed of the shifted and superimposed channel impulse responses of different channels. Due to the limitation of the characteristics of the midamble code, the channel impulse response calculated by the midamble code is actually Contains the channel impulse responses of multiple channels and multiple users. When the channel impulse responses of these different channels or different users cannot be strictly distinguished, the synchronization performance of this method will be affected to a certain extent.

When the mobile terminal wakes up from sleep, because it may be in a different cell or in a relatively bad communication environment, its channel or channel impulse response is usually difficult to distinguish quickly, so the Midamble code is used only to detect the mobile terminal after waking up. Synchronization is difficult to achieve very good results

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