Inter-Cell Interference Cancellation Using Directional PMI Sets
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Solution Overview
Problem
In massive MIMO communication systems, existing methods for inter-cell interference control are inefficient due to the high amount of information required for interference management, leading to increased time delays and ineffective interference reflection in dynamic environments.
Innovation Solution
A method and apparatus for transmitting and receiving inter-cell information using a set of PMIs (Precoding Matrix Indicators) that are specifically directed in both vertical and horizontal directions, reducing the amount of information exchanged and allowing for more efficient interference control, even in cases of coverage mismatch and shadowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed PMI information is transmitted for interference control, then interference management accuracy is improved, but information transmission overhead and time delay increase
Solution Approach 1:
The patent extracts only the essential PMI information needed for interference control from the complete PMI set. Instead of transmitting all PMI details, it selectively transmits only those PMIs that are relevant for predicting and managing inter-cell interference, thereby reducing information overhead while maintaining management accuracy
Solution Approach 2:
The patent performs preliminary classification and selection of PMIs at the transmitting end before transmission. By pre-identifying which PMIs are most relevant for interference control in dynamic environments, the system prepares the information in advance, reducing the processing burden and transmission requirements
2Measurement precision
If comprehensive PMI data is exchanged between base stations, then interference prediction accuracy is improved, but transmission time delay increases
Solution Approach 1:
The patent extracts only the critical PMI elements required for interference prediction from the complete PMI dataset. By identifying and transmitting only the most relevant PMIs that have the greatest impact on interference characteristics, the system reduces transmission time while preserving prediction accuracy
Solution Approach 2:
The patent changes the parameter representation by selecting a subset of PMIs based on their relevance to current interference conditions. Instead of transmitting all PMI parameters, it dynamically adjusts which parameters are transmitted based on the specific interference scenario, reducing transmission time delay
3Adaptability or versatility
If a large set of PMIs is transmitted for all directions, then complete coverage information is provided, but information overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by providing different levels of PMI information for different spatial directions. Instead of uniformly transmitting complete PMI sets for all directions, it selectively provides PMI information only for directions where interference is likely to occur or where coverage information is most needed, thereby reducing overall complexity while maintaining necessary completeness
Solution Approach 2:
The patent segments the PMI set by spatial direction and transmits only the relevant segments. By dividing the complete PMI information into direction-specific subsets and selectively transmitting only those segments that are relevant for current interference conditions, the system reduces information overhead and processing complexity
Data Source
AI summary
Provided are a method and a device for transmitting and receiving inter-cell information for cancelling inter-cell interference in a wireless communication system. The method for transmitting and receiving inter-cell information may comprise the steps of: taking a PMI set which is a set of PMIs of a signal generating interference to an area partitioned in a predetermined direction and transmitting same to the base station of an adjacent cell transmitting the signal generating interference; and receiving, from the base station of the adjacent cell, PMI information on at least one of the PMIs included in the PMI set.