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Method of improving preciseness of mobile communication terminal low frequency crystal oscillator

A low-frequency crystal, mobile communication equipment technology, applied in wireless communication, communication between multiple stations, synchronization devices, etc., to achieve the effect of easy synchronization and improved accuracy

Active Publication Date: 2006-03-29
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that additional hardware circuits need to be added to the terminal to implement

Method used

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  • Method of improving preciseness of mobile communication terminal low frequency crystal oscillator
  • Method of improving preciseness of mobile communication terminal low frequency crystal oscillator
  • Method of improving preciseness of mobile communication terminal low frequency crystal oscillator

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Embodiment Construction

[0037] Taking TD-SCDMA system as an example, briefly introduce the concepts of synchronization and synchronization difference.

[0038] TD-SCDMA system burst structure such as Figure 4 shown. The information communicated between the terminal and the base station is placed in the data symbol block, and the intermediate code is used to synchronize and identify the user. The terminal must be at the exact moment (data block start time, set to t w time) to receive or send signals (we call the terminal and the base station synchronous at this time), in order to realize the communication with the base station. If you receive and send signals ahead of time or behind, you cannot establish communication with the base station; the time difference in advance or behind is the synchronization difference (denoted as T gap ).

[0039] Among them, the nominal value F C : the nominal frequency of the low-frequency crystal oscillator, the nominal frequency of the 32KHz clock used in this e...

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Abstract

This invention relates to a method for increasing the accuracy of a low frequency crystal oscillator of a mobile communication terminal including the following steps: the terminal receives signals of the base station and analyses channels and the time scale, a microprocessor of the oscillator applies a synchronous algorithm to present the data received by the terminal processor to the synchronous algorithm of the base station to get the synchronous regulation value and re-computes the frequency theory value of the oscillator to approach the true value timely to increase the accuracy of the oscillator.

Description

Technical field: [0001] The invention relates to the field of mobile communication, in particular to a method for quickly recovering accurate system timing when a mobile communication terminal returns from a low-frequency crystal oscillator working mode, and improving the accuracy of the low-frequency crystal oscillator of the mobile communication terminal. Background technique: [0002] With the development and popularization of radio communication, the number of mobile communication users is increasing exponentially, and the number of mobile users in China has grown rapidly in recent years. come higher. Because the current advanced mobile communication terminals can not only provide basic voice and data functions, but also provide high-speed online image, music, video, web browsing, conference call, e-commerce information and other functions. In order to meet these complex functions, in addition to the most basic communication modules, mobile terminals also need to integr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/32H04B7/26H04W56/00H04W88/02
Inventor 许萍林毅郑建宏申敏
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD
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