Pilot Pattern Segmentation for Heterogeneous Network Interference
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Solution Overview
Problem
Current wireless communication systems lack an effective pilot selection method for heterogeneous networks, particularly in macro-femto heterogeneous networks, where interference between different transmission links can occur, leading to unreliable data transmission.
Innovation Solution
A pilot selection method is introduced that differentiates pilot patterns for public advanced base stations, closed subscriber group femtocell base stations, and macrocell base stations by using distinct segments and pilot patterns, allowing for the selection of rank-1 and rank-2 pilot patterns based on specific segment IDs and cell IDs to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interlaced pilot patterns are used to avoid pilot collision at cell edges, then channel estimation accuracy is improved, but pilot pattern complexity increases
Solution Approach 1:
The patent segments the available pilot patterns into different types (first type for macrocell ABS, second type for non-macrocell ABS) and assigns them based on base station type. This segmentation allows the system to use simpler appropriate patterns for each ABS type rather than universally complex interlaced patterns, reducing overall complexity while maintaining accuracy where needed.
Solution Approach 2:
The patent applies different pilot pattern qualities to different locations and scenarios: macrocell ABS use first type patterns optimized for their coverage area, while non-macrocell ABS use second type patterns suited to their specific environments. This local optimization avoids the need for uniformly complex patterns across all base stations.
2Reliability
If pilot patterns are differentiated for different base station types, then interference between transmission links is reduced, but system complexity increases
Solution Approach 1:
The patent changes the parameter of pilot pattern type based on the base station type parameter. By establishing a mapping relationship between ABS type and pilot pattern type, the system automatically selects appropriate patterns without complex real-time decision-making, reducing system complexity while maintaining reliable transmission through appropriate pattern differentiation.
3Object-generated harmful factors
If multiple pilot pattern types are assigned to different ABS types, then interference between macrocell and non-macrocell links is minimized, but pilot pattern management complexity increases
Solution Approach 1:
The patent performs preliminary classification of base stations into macrocell and non-macrocell types, and pre-assigns corresponding pilot pattern types to each category. This preliminary action establishes clear rules for pattern selection, simplifying ongoing management by eliminating the need for complex real-time interference calculations and pattern adjustments.
Data Source
AI summary
A pilot selection method adapted for selecting rank-2 pilot patterns for a macrocell advanced base station (ABS), a femtocell ABS and a non-macrocell and non-femtocell ABS is proposed along with a wireless communication system and a base station thereof. Different rank-2 pilot pattern is selected for a femtocell ABS from its overlay macrocell ABS and non-macrocell and non-femtocell ABS rank-2 pilot patterns. Another pilot selection method for selecting a rank-1 pilot pattern for a femtocell ABS co-located with at least a macrocell ABS is also proposed. Different rank-1 pilot pattern is selected for a femtocell ABS from its overlay macrocell ABSs using rank-1 and/or rank-2 pilot patterns, where some of the macrocell ABSs can use rank-2 pilot patterns and the rest of the macrocell ABSs just use rank-1 pilot patterns. Also, different rank-1 pilot pattern is selected for the femtocell ABS from its neighboring femtocell ABSs using rank-1 pilot patterns.