Inter-Cell Interference Coordination in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, especially with moving cells, there is a challenge in effectively coordinating interference between backhaul and access links, particularly when a moving cell cannot obtain the physical cell identifier of another moving cell, which affects data transmission quality and reliability.
Innovation Solution
A method is introduced where a fixed evolved node B (eNB) receives channel state information-reference signal (CSI-RS) configurations from individual moving cells, determines a CSI-RS configuration for the backhaul link of one moving cell based on these configurations, and transmits it to measure interference caused by another moving cell's access link, allowing for interference coordination by adjusting parameters like subframe configurations and beam directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If moving cells are deployed to improve coverage and capacity in dynamic environments, then system adaptability and coverage are improved, but interference between backhaul and access links increases
Solution Approach 1:
The patent segments the wireless communication system into distinct backhaul links and access links, allowing separate configuration and management of CSI-RS resources for each link type. This segmentation enables independent optimization of interference coordination for backhaul and access transmissions.
Solution Approach 2:
The patent applies local quality by configuring cell-specific CSI-RS parameters (such as resource elements, scrambling codes, and transmission power) tailored to the specific interference conditions of each moving cell's backhaul and access links. This allows targeted interference management rather than uniform system-wide approaches.
2Reliability
If CSI-RS configurations are optimized for access links, then access link performance is improved, but backhaul link interference measurement capability deteriorates
Solution Approach 1:
The patent implements dynamic CSI-RS configuration where the system can adaptively adjust resource allocation, transmission power, and timing between backhaul and access links based on real-time interference conditions. This dynamic approach allows the system to optimize access link performance while preserving backhaul interference measurement capability through time-division or frequency-division multiplexing of CSI-RS resources.
Solution Approach 2:
The patent introduces the fixed eNB as an intermediary that coordinates CSI-RS configurations between multiple moving cells. The fixed eNB receives CSI-RS configurations from individual moving cells, determines appropriate backhaul link configurations, and transmits them to ensure proper interference measurement while maintaining access link performance.
3Device complexity
If moving cells operate without detecting physical cell identifiers of other moving cells, then device complexity is reduced, but interference coordination capability deteriorates
Solution Approach 1:
The patent enables moving cells to self-configure their CSI-RS parameters based on locally available information and pre-defined configuration rules, without requiring complex detection and negotiation with other moving cells. Each moving cell autonomously determines its backhaul and access link configurations, reducing inter-cell signaling overhead while maintaining interference coordination through the fixed eNB.
Data Source
AI summary
According to one embodiment of the present invention, a method by which a fixed base station adjusts inter-cell interference in a wireless communication system comprises the steps of: receiving channel state information-reference signal (CSI-RS) configurations on an access link of each moving cell connected to the fixed base station; determining the CSI-RS configuration on a backhaul link of a first moving cell among the moving cells on the basis of the CSI-RS configurations on the access link; and providing, to the first moving cell, the CSI-RS configuration on the determined backhaul link, wherein the CSI-RS configuration on the determined backhaul link is for measuring, by the backhaul link of the first moving cell, the interference received from an access link of a second moving cell among the moving cells.