Inter-Cell Interference Removal via Priority-Based Feedback
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Solution Overview
Problem
In massive MIMO communication systems, especially in small cells, inter-cell interference removal is challenging due to frequent changes in Modulation and Coding Scheme (MCS) levels, leading to instability in interference signal decoding and ping-pong effects in link adaptation, which affect transmission rates and system capacity.
Innovation Solution
A method for generating and sharing inter-cell information, where user equipment identifies priorities for channel information feedback based on cell identifiers and resource blocks, allowing for targeted interference removal and stable MCS level maintenance by coordinating with base stations, thereby optimizing channel utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-cell interference removal is performed in massive MIMO small cells, then transmission capacity and system capacity are improved, but inter-cell interference and instability in MCS level decoding occur
Solution Approach 1:
The patent implements a feedback mechanism where user equipment reports channel information to the base station, which then adjusts the MCS level accordingly. This closed-loop feedback system allows the base station to maintain stable MCS levels by continuously adapting to channel conditions and interference patterns, resolving the contradiction between achieving high transmission capacity through interference removal and maintaining MCS level stability.
Solution Approach 2:
The patent dynamically changes the MCS level parameter based on channel conditions and interference levels. By adjusting this key parameter adaptively rather than maintaining a fixed value, the system can optimize transmission capacity while preventing instability in decoding, as the MCS level is modified in response to actual channel state information feedback from user equipment.
2Measurement precision
If channel information feedback is performed for all cells, then interference removal accuracy is improved, but feedback overhead and system complexity increase
Solution Approach 1:
The patent applies local quality by having user equipment provide channel information feedback selectively for specific neighboring cells rather than all cells. The base station identifies which neighboring cells cause significant interference and requests channel information only for those specific cells. This localized approach maintains high interference removal accuracy for the most problematic interferers while reducing feedback overhead and system complexity compared to universal feedback.
3Productivity
If MCS level is increased to improve transmission rate, then data service quality is improved, but interference signal decoding stability deteriorates
Solution Approach 1:
The patent implements dynamic adaptation of the MCS level based on channel conditions and interference levels. Rather than using a fixed high MCS level, the system dynamically adjusts the MCS level in response to feedback from user equipment about channel state and interference conditions. This dynamic approach allows the transmission rate to be optimized when conditions permit while maintaining decoding stability when interference is high, resolving the contradiction between achieving high transmission rates and maintaining decoding stability.
Data Source
AI summary
Provided is a method for generating inter-cell information for inter-cell interference removal in a wireless communication system. A method by which a terminal removes inter-cell interference comprises the steps of: receiving a signal from a serving cell and a neighboring cell adjacent to the serving cell; identifying the priority of the serving cell for feedback of channel information on the basis of an identifier of the cell and a resource block; identifying whether there is feedback of channel information on the signal received on the basis of the priority; and transmitting the channel information to a base station of the serving cell according to the identification of whether there is feedback.