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Method and device for calibrating sleep clock of TD-SCDMA terminal

A TD-SCDMA, clock calibration technology, applied in synchronization devices, selection devices, advanced technologies, etc., can solve the problems of short sleep time of terminals, adverse effects of standby time, etc., to reduce the average duration, prolong the actual sleep time, The effect of reducing the number of times

Inactive Publication Date: 2007-12-19
ST ERICSSON SEMICON BEIJING
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AI Technical Summary

Problems solved by technology

In the existing technology, calibration is performed once in each DRX cycle, and the duration of each calibration is a long fixed value, which makes the actual sleep time of the terminal shorter, further adversely affecting its standby time

Method used

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  • Method and device for calibrating sleep clock of TD-SCDMA terminal
  • Method and device for calibrating sleep clock of TD-SCDMA terminal
  • Method and device for calibrating sleep clock of TD-SCDMA terminal

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The key of the present invention is: since the TD-SCDMA terminal in standby mode needs to wake up once in each DRX cycle and synchronize with the DwPTS of the base station, if the synchronization error between the terminal timing and the base station timing is not greater than the synchronization window of the system length, there is no need to perform sleep clock calibration; further, on the premise of satisfying the clock calibration accuracy, the calibration duration is dynamically adjusted by using the parameters of the network side in the TD-SCDMA system and the environmental parameters of the terminal itself.

[0034] Suppose the synchronization window length of TD-SCDMA system is T SYNC (The length of the synchronization window corresp...

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Abstract

This invention provides a method and a device for calibrating TD-SCDMA terminal sleep clock including: in each DRX period, a synchronous error between timing of terminals and timing of base stations is obtained to judge if said error is greater than the length of a TD-SCDMA systematic synchronous window, if so, the calibration is done, otherwise, the calibration is not done, which can prolong the actual sleep time of terminals under the stand-by mode so as to prolong the stand-by time of terminal.

Description

technical field [0001] The present invention relates to a wireless terminal sleep clock calibration technology, in particular to a TD-SCDMA terminal sleep clock calibration method and device. Background technique [0002] Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system is a synchronous communication system, and the terminal must perform accurate time synchronization with the base station to ensure normal communication between the two. In the working mode, the terminal uses a high-frequency clock to generate various required timings and timings, providing an accurate time reference for the operation of the baseband chip, radio frequency control and system. This high-frequency clock is one-eighth of the TD-SCDMA system The chip rate is time precision (ie 97.66ns, converted to a clock frequency of 10.24Mhz). [0003] In standby mode, the terminal performs the sleep and wake-up process according to the discontinuous reception (DRX) cycle configured on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/32H04W52/02H04W56/00
CPCY02D30/70
Inventor 戴凌龙崔殿华唐良东
Owner ST ERICSSON SEMICON BEIJING
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