Coordinated Downlink Zones for Interference Mitigation
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Solution Overview
Problem
Wireless communication systems face challenges in optimizing system performance due to intercell interference, particularly in frequency reuse configurations where adjacent cells operate on the same frequency band, limiting bandwidth utilization and system capacity.
Innovation Solution
The implementation of coordinated downlink zones across multiple base stations, where resource allocation is synchronized and coordinated, allowing for interference mitigation through channel estimation and interference cancellation techniques, enabling efficient use of the operating frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency reuse-1 configuration is implemented to maximize bandwidth utilization, then system capacity is improved, but intercell interference increases
Solution Approach 1:
The patent segments the frequency band into multiple resource allocation zones (first zone and second zone) with different permutation types. This segmentation allows different cells to use different resource allocation patterns within the same frequency band, reducing intercell interference while maintaining frequency reuse-1 for system capacity.
Solution Approach 2:
The patent applies different permutation types (first permutation type and second permutation type) to different resource allocation zones. This local differentiation enables cells to have customized resource allocation patterns in specific zones, reducing interference in overlapping areas while maintaining overall bandwidth utilization.
2Object-affected harmful factors
If sparsely populated spectrum reuse schemes (frequency reuse-3 or frequency reuse-6) are implemented to reduce intercell interference, then interference is reduced, but system capacity is limited
Solution Approach 1:
The patent introduces a new dimension of resource allocation by implementing multiple resource allocation zones with different permutation types within the same frequency band. This transforms the traditional single-dimension frequency reuse approach into a multi-dimensional resource allocation scheme, enabling interference reduction without sacrificing system capacity.
Solution Approach 2:
The patent changes the permutation type parameter across different resource allocation zones. By varying the permutation type (first permutation type vs. second permutation type) in different zones, the system can adapt resource allocation patterns to reduce interference while maintaining full bandwidth utilization for system capacity.
3Use of energy by moving object
If the same operating band is assigned to multiple adjacent cells to maximize bandwidth utilization, then bandwidth utilization is improved, but interference in overlapping coverage areas increases
Solution Approach 1:
The patent segments the operating band into multiple resource allocation zones with different permutation types. This segmentation allows adjacent cells to use the same operating band (maintaining bandwidth utilization) while applying different resource allocation patterns in different zones to reduce interference in overlapping coverage areas.
Solution Approach 2:
The patent applies different permutation types to different resource allocation zones, creating local quality variations in resource allocation. This enables adjacent cells to maintain the same operating band for bandwidth utilization while having differentiated resource patterns in specific zones to reduce interference in overlapping areas.
Data Source
AI summary
Methods and apparatus are described for mitigating intercell interference in wireless communication systems utilizing substantially the same operating frequency band across multiple neighboring coverage areas. The operating frequency band may be shared across multiple neighboring or otherwise adjacent cells, such as in a frequency reuse one configuration. The wireless communication system can synchronize one or more resource allocation regions or zones across the multiple base stations, and can coordinate a permutation type within each resource allocation zone. The base stations can coordinate a pilot configuration in each of a plurality of coordinated resource allocation regions. Subscriber stations can be assigned resources in a coordinated resource allocation region based on interference levels. A subscriber station can determine a channel estimate for each of multiple base stations in the coordinated resource allocation region to mitigate interference.