Configuration switching method of LTE (Long Term Evolution) system under high-speed mobile context

Abstract

The invention discloses a configuration switching method of an LTE (Long Term Evolution) system under a high-speed mobile context. The method comprises the following steps that a physical layer of a source base station carries out Doppler frequency offset estimation, carries out statistics and sampling on a Doppler frequency offset value, and reports to a high level before a user terminal measurement report is received; a terminal sends a measurement report message to the source base station; after the source base station receives the user terminal measurement report, the source base station carries out a switching judgment, if switching is allowed, the source base station synchronously initiates a switching request and carries the Doppler frequency offset value; after a target subject receives the switching request, the target subject audits resources, if switching is allowed, the target subject synchronously carries out local configuration, analyzes the Doppler frequency offset value and configures to the physical layer; and after the target subject completes configuration, the target subject replies a switching request response message. According to the method, the condition of failed switching of a target cell, which is caused by carrying out frequency offset estimation again, can be avoided, and the switching success rate is improved. In addition, the additional time caused by difficulty in random access due to poor channel quality of the target cell can be reduced, and the switching delay is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a handover configuration method for improving the handover success rate of an LTE system in a high-speed mobile scene. Background technique [0002] In the LTE (Long Term Evolution) system, handover technology is used to ensure that users can obtain better service quality. Therefore, the handover success rate is an important index in the LTE system. In the high-speed mobile scenario, the channel environment of the LTE system is relatively complex, and the Doppler frequency shift effect caused by the relative motion between the terminal and the base station is particularly obvious. like figure 1 As shown, the base station transmit frequency, terminal receive frequency, and base station receive frequency are F1, F2, and F3 respectively. The Doppler frequency shift causes a frequency deviation between the signal received by the terminal UE and the signal transmitted...

AI Technical Summary

Problems solved by technology

Although this type of method can improve the success rate of handover to a certain extent, it often sacrifices the performance of another aspect of the system, such as increasing the number of signaling interactions, increasing the handover delay, and affecting user communication to a certain extent. quality

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