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Detection method and apparatus for terminal high-speed moving state

A technology of high-speed movement and detection method, which can be used in measurement devices, linear/angular velocity measurement, velocity/acceleration/shock measurement, etc., and can solve the problems of instability, large carrier frequency jitter, and low accuracy of carrier frequency offset estimation. Optimal demodulation performance and simple implementation

Inactive Publication Date: 2009-07-15
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

However, if a larger loop bandwidth is also used to adjust AFC in a slow-moving scene, since there are usually more scatterers in a slow-moving environment, the direct component in the received signal is low or even absent at this time, which makes the carrier The accuracy of frequency offset estimation is relatively low, and the AFC adjustment with a large loop bandwidth will cause the local carrier frequency of the terminal to fluctuate greatly and become unstable, which will affect the demodulation performance of the terminal

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  • Detection method and apparatus for terminal high-speed moving state
  • Detection method and apparatus for terminal high-speed moving state
  • Detection method and apparatus for terminal high-speed moving state

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Embodiment Construction

[0028] In order to facilitate the understanding of the present invention, the following specifically describes the change of the carrier frequency of the signal received by the terminal in the high-speed mobile state and the frequency hopping problem when cell handover or cell reselection occurs.

[0029] In high-speed mobile scenarios, the cellular communication system will adopt larger cell coverage. At present, the network deployment method of BBU+RRU (BBU: Base Band Unit, RRU: Remote Radio Unit) is an effective method to solve large area coverage. The principle is as figure 1 As shown, that is, multiple RRUs transmit signals from the same BBU, that is to say, these multiple RRUs belong to the same logical cell, and their functions are equivalent to multiple antennas of the same base station, but they can be far apart from each other. Coverage can be achieved.

[0030] Although this way of site deployment can solve the problem of frequent switching of users, another probl...

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Abstract

The invention provides a high-speed mobile terminal state detection method and device, comprising the following steps: A. recording an automatic frequency control value of a terminal in each preset recording period; B. calculating a maximum frequency value and a minimum frequency value according to the recorded automatic frequency control values; C. determining whether the terminal is at high-speed mobile state or not according to the difference of the maximum frequency value and the minimum frequency value. The detection method accurately detects whether the terminal is at high-speed mobile state or not and the detection method is simple and agile. The detection method also comprises: setting the terminal automatic frequency control based on the maximum frequency value and the minimum frequency value when the terminal is at high-speed mobile state and the district switch or reelection occurs. The detection method solves the problem of frequency jump due to district switch or reelection when the terminal is at high-speed mobile state.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and a device for detecting a high-speed moving state of a terminal. Background technique [0002] In the cellular communication system, the terminal tracks the frequency of the carrier through AFC (automatic frequency control), and then completes the correct demodulation of the received data. In a mobile environment, the moving speed of the terminal will cause Doppler frequency shift, and the Doppler frequency shift will directly cause the frequency change of the receiving carrier. Generally, the faster the terminal moves, the larger the Doppler frequency shift, and the faster the frequency of the receiving carrier changes. [0003] In a high-speed mobile scenario, in order to correctly demodulate data, the AFC of the terminal needs to be able to track the frequency change of the carrier quickly, so the loop bandwidth adjusted by the AFC shoul...

Claims

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Application Information

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IPC IPC(8): G01P3/00H04L27/00
Inventor 许百成
Owner ST ERICSSON SEMICON BEIJING
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