Method and device for adjusting timing advance in coordinated multi-point transmission

Abstract

An embodiment of the invention provides a method and a device for adjusting timing advance in coordinated multi-point transmission. The method includes receiving an uplink reference signal from user equipment (UE) at one or more receiving points; selecting one of the one or more receiving points as a reference point for adjusting the timing advance by the UE based on the quality of the uplink reference signal; and indicating the selected reference point to the UE. By means of the method and the device, appropriate receiving points can be provided for the UE as reference points, therefore the UE can effectively adjust the timing advance according to the signal receiving time at the reference points to overcome inter-symbol interference at the receiving points, the receiving efficiency of the receiving points is improved, and the whole performance of a coordinated multi-point transmission system is improved accordingly.

Description

technical field [0001] Embodiments of the invention relate generally to wireless communication technologies. More specifically, embodiments of the present invention relate to methods and devices for timing advance adjustment in coordinated multi-point transmission. Background technique [0002] In wireless communication systems, Coordinated Multi-Point transmission / reception (CoMP) is an important technology to significantly improve cell throughput and edge user rate, in which uplink Coordinated Multi-Point transmission / reception involves multiple geographic locations Distributed receiving points (such as base stations, repeaters, or remote radio RRHs) jointly receive data of user equipment (referred to as "UE") and perform joint processing. In order to achieve correct data reception, it is necessary to perform uplink synchronization on the UE and multiple receiving points, which usually involves timing advance adjustment of the UE. [0003] In a CoMP system, uplink synchr...

AI Technical Summary

Problems solved by technology

[0006] First, it is difficult to determine the optimal CP length covering different uplink CoMP scenarios

For example, for scenarios where the propagation delays to multiple receiving points are similar, a short CP length is sufficient at this time, and there is no need to extend the CP length, otherwise resources will be wasted

However, a short CP length is not suitable for scenarios where the propagation delay changes rapidly

Second, the extended CP will cause a large overhead and thus the uplink capacity loss, because the symbols originally used to transmit data are occupied by the extended CP

Finally, this extended CP length solution does not support legacy UEs and limits scheduling flexibility, since for UEs in CoMP systems, they can only be scheduled within frames with longer CP lengths

[0007] Furthermore, due to the movement of the UE, the change of the propagation environment, the oscillator drift in the UE and the Doppler frequency shift, the time when the UE's uplink signal arrives at the receiving point will continue to change, which will affect the communication between the UE and multiple receiving points. The synchronization of the

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