A frequency offset compensation method, device and system

Abstract

Provided are a frequency deviation compensation method, device and system, which relate to the field of communications and can estimate correct frequency deviation and reduce the occurrence probability of handover failure or service interruption. The frequency deviation compensation method comprises: a user equipment (UE) acquiring a location relationship between the UE and a target cell, the location relationship between the UE and the target cell comprising: the UE approximates to or moves away from the target cell; and the UE positively or negatively adjusting a frequency deviation compensation window according to the location relationship between the UE and the target cell. The frequency deviation compensation method, device and system provided in the embodiments of the present invention are used for compensating frequency deviation.

Description

technical field [0001] The present invention relates to the communication field, in particular to a frequency offset compensation method, device and system. Background technique [0002] In a wireless communication system, the movement of UE (User Equipment, user equipment) will generate Doppler frequency shift. When the UE moves from the first base station to the second base station, it is assumed that the first base station and the second base station use the same carrier f , then the frequency offset caused by the Doppler effect is f d , according to the principle of the Doppler effect, when the UE is far away from the first base station, the frequency of the signal received from the first base station is f-f d ; When the UE approaches the second base station, the frequency of the received signal from the second base station is f+f d . [0003] When the UE switches from the first base station to the second base station, the receiving frequency of the UE is switched fro...

AI Technical Summary

Problems solved by technology

However, when this frequency offset compensation algorithm is used, when the UE moves at a relatively fast speed, such as 500 km / h in a high-speed rail scenario, the actual maximum frequency offset may appear outside the range of the compensation window, but due to the limitation of the compensation window limitation, the frequency offset compensation algorithm cannot estimate the correct frequency offset, resulting in handover failure or service interruption. For example, assuming that the actual maximum frequency offset for UE handover from the first base station to the second base station is 2.92KHz, If it falls outside the frequency offset compensation window [-2.3KHz, 2.3KHz], the maximum frequency offset obtained by final estimation is 2.3KHz. Assuming that the UE fails to switch from the first base station to the second base station, it will switch back to the first base station. The actual maximum frequency offset is -2.92KHz, which falls outside the frequency offset compensation window [-2.3KHz, 2.3KHz], then the final estimated maximum frequency offset is -2.3KHz, which is quite different from the correct frequency offset

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