Antenna Pattern Selection for Small Cell Interference Mitigation
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Solution Overview
Problem
Small cell networks face challenges in co-channel operation with macrocellular networks, particularly in outdoor deployments, due to increased interference and sub-optimal deployment configurations, which affect signal quality and spectral efficiency.
Innovation Solution
A method using multi-element antennas with self-optimization techniques to select optimal antenna patterns based on RF signatures from user equipment, improving signal-to-interference-plus-noise ratio and reducing interference by cycling through selectable patterns and associating them with confidence metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed without prior planning in dense configurations, then network coverage and capacity are improved, but inter-small cell interference increases significantly
Solution Approach 1:
The patent applies local quality by configuring different antenna patterns for different small cells based on their specific deployment locations and interference environments. Each small cell's antenna pattern is optimized locally rather than using a uniform configuration, allowing dense deployment while managing interference through location-specific adjustments.
Solution Approach 2:
The patent changes the antenna pattern parameter to optimize signal transmission. By selecting from multiple predefined antenna patterns with different beam directions and coverage areas, the system adapts transmission characteristics to minimize interference while maintaining network capacity in dense small cell deployments.
2Productivity
If co-channel operation is used with macrocellular networks to increase spectral efficiency, then frequency re-use is improved, but signal quality and interference management become more challenging
Solution Approach 1:
The patent implements local quality by applying different antenna patterns to small cells based on their specific geographic locations and propagation environments. This localized optimization allows co-channel operation with macrocells by directing signals in specific patterns that minimize overlap and interference with macrocell coverage areas, thereby maintaining spectral efficiency while managing interference.
Solution Approach 2:
The patent introduces dynamics by selecting antenna patterns based on real-time or semi-real-time conditions. The system can adapt antenna pattern selection to changing traffic loads, user distributions, and interference conditions, enabling flexible co-channel operation that maintains spectral efficiency while dynamically managing interference with macrocellular networks.
3Reliability
If antenna patterns are optimized for specific RF signatures to improve signal quality, then received signal quality is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple antenna patterns with different beam directions and coverage characteristics before deployment. The system maintains a library of predefined patterns that can be quickly selected based on RF signature matching, avoiding the need for complex real-time optimization calculations and reducing system complexity while still achieving signal quality improvement.
Solution Approach 2:
The patent uses copying by creating multiple predefined antenna patterns that represent different spatial configurations. Instead of generating unique complex patterns for each situation, the system copies and selects from a standardized set of patterns that have been pre-optimized for different RF signature types, simplifying the overall system while maintaining signal quality.
Data Source
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Figure 2(a)~2(b)
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AI summary
A method, in a telecommunications network, for improving received signal quality at a user equipment (UE) device, comprising receiving, at a node of the network, a candidate radio frequency (RF) signature of the UE representing a measurement report for the UE and including data representing signal quality of received transmissions at the UE from the node and/or neighbouring nodes of the UE, and modifying a transmission profile of an antenna of the node by selecting an antenna pattern from a set of selectable antenna patterns of the antenna on the basis of the candidate RF signature.