Method for adjusting frequency deviation of mobile terminal and device thereof
A mobile terminal, frequency offset technology, applied in the direction of automatic frequency control components, electrical characteristic frequency control, electrical components, etc., can solve problems such as system performance degradation, communication quality degradation, downlink interruption, etc., to avoid frequency offset sudden change , the effect of improving performance
Inactive Publication Date: 2010-07-07
ZTE CORP
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Benefits of technology
The technical feature described in this patented technology allows users to quickly switch between different networks without affecting their phone' ability to move fast enough during communication sessions. This results in improved overall network quality and better user experience (QoE).
Problems solved by technology
Technologies described in the technical problem addressed in this patents include improving code division multipleaccess systems with fast data transfer rates due to increased demand for faster vehicle movements or frequent changes in road conditions such as heavy rain at highway intersections. These factors can lead to significant delays caused by phase noise and other disturbances like multiphase modulation. To address these issues, there exists an improved solution called Time Difference Frequency Shift Interference Compensated Cellular Broadcast System (TDCSSC), where each user's device uses specific frequencies based on their location and velocity. However, current methods require complex calculations involving complicated algorithms and may result in poorer overall performance than desired because they cannot accurately determine the optimal frequency alignment required without extensive simulations during implementation.
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[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0036] Such as image 3 As shown, the device for adjusting the frequency offset of the mobile terminal of the present invention includes a downlink broadcast signal strength detection unit 1, a broadcast signal strength judgment unit 2, a frequency offset estimation value calculation unit 3, and a frequency offset estimation value filtering unit 4 connected in sequence. among them,
[0037] The downlink broadcast signal strength detection unit 1 is used to detect the downlink broadcast signal strength of the serving cell and neighboring cells;
[0038] The broadcast signal strength judging unit 2 is connected to the output end of the downlink broadcast signal strength detecting unit 1, and is used to judge whether the difference between the downlink broadcast signal strength of the serving cell and the strongest neighboring cell is greater than a threshold;
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The invention discloses a method for adjusting the frequency deviation of a mobile terminal and a device thereof. The method comprises the following steps: a terminal detects the intensity of downlink broadcast signals of a service cell and neighbor cells; the terminal judges whether the intensity difference of the downlink broadcast signals between the service cell and the strongest neighbor cell is larger than the threshold; if yes, the terminal calculates the downlink frequency deviation according to the broadcast channel of the service cell and adopts the frequency deviation as the frequency deviation estimated value of the mobile terminal; if not, the terminal calculates the downlink frequency deviation of the service cell according to the broadcast channel of the service cell and the downlink frequency deviation of the strongest neighbor cell according to the broadcast channel of the strongest neighbor cell, combines the two frequency deviations as the frequency deviation estimated value of the mobile terminal, and corrects the local carrier frequency of the terminal through the smooth frequency deviation estimated value of the terminal. By using the invention, the problem of abrupt change of the frequency deviation when the terminal transits from the service cell to a neighbor cell can be avoided, the performance of the terminal in a high mobility environment can be improved, and the invention is also suitable for a low mobility terminal.
Description
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