Base Station Interference Management via X2 Interface Coordination
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Solution Overview
Problem
In LTE Advanced mobile communication systems, carrier aggregation technology faces challenges in reducing interference between macro and pico base stations, leading to deteriorated communication quality and inefficient load dispersion.
Innovation Solution
The implementation of inter-base station communication via X2 and S1 interfaces allows macro and pico base stations to exchange information for determining and managing the use of component carriers, enabling the suspension or reduction of transmission power to mitigate interference, thereby improving communication quality and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation technology is implemented to widen bandwidth, then communication capacity increases, but interference between macro and pico base stations deteriorates communication quality
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange information about component carrier usage status through X2 and S1 interfaces. This feedback loop enables dynamic adjustment of component carrier allocation based on actual interference conditions and load status, allowing the system to maintain high communication capacity while adapting to interference conditions that affect quality.
Solution Approach 2:
The patent introduces intermediary communication interfaces (X2 interface between base stations and S1 interface to the core network) that mediate the coordination between macro and pico base stations. These intermediaries enable the exchange of component carrier usage information and facilitate cooperative resource management, resolving the interference problem while preserving the benefits of carrier aggregation.
2Productivity
If component carriers are allocated to pico base stations to improve load distribution, then productivity increases, but interference from macro base stations worsens communication quality
Solution Approach 1:
The patent enables preliminary actions by allowing base stations to proactively exchange information about intended component carrier usage before actual transmission begins. This advance notification allows receiving base stations to prepare interference mitigation strategies, such as adjusting their own component carrier allocation or transmission parameters, thereby reducing the impact of interference while maintaining load distribution benefits.
Solution Approach 2:
The patent implements dynamic component carrier allocation where the assignment of component carriers to macro or pico base stations is not fixed but adapts in real-time based on interference conditions and load status. This dynamic approach allows the system to optimize the balance between load distribution and interference mitigation by flexibly reassigning component carriers as conditions change.
3Reliability
If transmission power is maintained at high levels to ensure coverage, then communication reliability is improved, but interference increases and power consumption rises
Solution Approach 1:
The patent enables parameter changes by allowing base stations to dynamically adjust transmission power levels based on component carrier usage status and interference conditions. Through the exchanged information about component carrier allocation, base stations can identify opportunities to reduce power on certain carriers while maintaining coverage through other carriers, thereby reducing overall power consumption while preserving reliability.
Data Source
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AI summary
A macro base station MeNB in a mobile communication system that supports a carrier aggregation technology defined in a 3GPP standard, communicates with a pico base station PeNB #1 via an X2 interface. The macro base station MeNB transmits information to the pico base station PeNB the information being used when the pico base station PeNB determines a component carrier requested to be limitedly used by the macro base station MeNB or a component carrier requested to be released from use limitation by the macro base station MeNB.