A Physical Downlink Control Channel Interference Elimination Method Based on Coordination Between Base Stations

Abstract

The invention discloses a physical downlink control channel interference elimination method based on inter-base station cooperation, which is applied in a wireless cellular mobile communication system, and user equipment in a cellular cell performs signal-to-noise ratio (SINR) of a physical downlink control channel (PDCCH) Estimated to judge the severity of the current interference, and select the traditional interference elimination method or the interference elimination algorithm based on cooperation between base stations according to the situation. For the control channel interference cancellation algorithm based on inter-base station cooperation, the base station or user equipment first determines the interfering base station, the base station and the interfering base station exchange the control information and channel status of the physical downlink control channel through the X2 or S1 interface, and finally the base station equipment through Specific time and frequency are sent to the user equipment, and more accurate interference elimination is performed to ensure normal scheduling under severe interference conditions and improve system performance.

Description

technical field [0001] The present invention relates to the field of wireless communication technology, and in particular, the present invention relates to a control channel interference elimination method based on cooperation between macro base stations, which is applicable to the same-frequency networking in an LTE wireless communication system. Background technique [0002] With the development of the industry and the advancement of technology, various wireless communication systems are committed to improving system performance to meet the ever-increasing performance requirements. The wireless communication system that is widely used today is a long-term evolution system, that is, an LTE (Long Term Evolution) system. [0003] Since the anti-interference technology and system design margin adopted by each channel of the LTE system are different, the same-frequency networking capabilities of different channels are also different. In addition, the consequences of co-channel...

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Problems solved by technology

[0006] On the one hand, the existing signal interference processing methods mostly use interference coordination technology to allocate the spectrum in each area of ​​the cell, resulting in the inability to achieve the highest spectrum efficiency, and the interference coordination technology is subject to many restrictions in actual deployment, which may become an important factor in the further evolution of the LTE system. time bottleneck; on the other hand, there are few studies on interference cancellation on the control channel. The existing interference cancellation schemes need to obtain relevant configuration information from the interfering base station through the serving base station, and perform interference processing through the configuration information. The complexity of the solution is high, which adds unnecessary burden to the system, resulting in the inability to obtain better interference cancellation effect

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