Base Station Interference Alignment for Cellular Quality
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Solution Overview
Problem
Existing communication systems face inefficiencies in moderating inter-cell interference, particularly in one-cell reuse cellular systems, where the same frequency is used across cells, leading to deteriorated communication quality at cell edges due to interference from adjacent cells.
Innovation Solution
A communication system where base station apparatuses in adjacent or overlapping communication areas cooperate by exchanging control information to manage inter-cell interference, with a leader cell determining and notifying other cells to initiate cooperative control based on receive quality thresholds, and calculating transmit/receive weights to orthogonalize interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same frequency is used in all cells to enhance frequency use efficiency and maximum transmission speed, then frequency use efficiency and transmission speed are improved, but communication quality at cell edges deteriorates due to interference from adjacent cells
Solution Approach 1:
The patent converts the harmful interference from adjacent cells into a beneficial signal by applying interference alignment technology. The base stations cooperatively calculate transmit weights to align interference signals into a subspace that can be effectively separated from desired signals at the receiver, thereby transforming interference from a detrimental factor into a manageable component that does not degrade communication quality
Solution Approach 2:
The patent merges the operations of multiple base stations by implementing cooperative control where base stations in different cells jointly calculate and share transmit weights. This coordination allows the system to treat interference from multiple cells as a unified problem that can be solved through collective optimization of transmission parameters
2Reliability
If base station apparatuses in multiple cells cooperatively moderate inter-cell interference through IA technology, then communication quality is improved, but the complexity of determining and coordinating control procedures among multiple base stations increases
Solution Approach 1:
The patent creates a universal cooperative control framework that can be applied across different cell configurations and interference scenarios. The standardized procedure for determining leader cells, calculating transmit weights, and coordinating control actions provides a multi-functional solution that handles various interference patterns through a unified approach, reducing the complexity of implementing cell-specific solutions
Data Source
AI summary
There is provided an invention whose object is to efficiently perform exchange of control information, for example, in the case where a plurality of cells cooperate to moderate inter-cell interference, like the IA technology.There is provided a communication system in which there is a plurality of communication areas in which a base station apparatus and at least one terminal apparatus perform wireless communication, and the plurality of communication areas are adjacent to or overlap one another, wherein, in each communication area, in a case of performing cooperative control that performs communication while taking into consideration communication conditions in at least one another communication area, a base station apparatus in one communication area among the plurality of communication areas notifies a base station apparatus in another communication area of information for starting the cooperative control.