Subframe Timing Compatibility Hierarchy for Carrier Aggregation
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Solution Overview
Problem
In LTE networks, carrier aggregation with different uplink-downlink configurations across cells leads to interference issues and increased complexity, as existing systems require identical configurations for all aggregated cells to avoid interference, limiting flexible resource allocation and increasing implementation costs.
Innovation Solution
Implementing a subframe timing compatibility hierarchy that allows for different uplink-downlink configuration numbers across aggregated cells, enabling efficient assignment of timing configurations to user equipment, thereby reducing interference and enhancing flexible resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identical uplink-downlink configurations are required for all aggregated cells, then interference is avoided, but resource allocation flexibility and system adaptability are reduced
Solution Approach 1:
The patent applies local quality by allowing different uplink-downlink configurations for different cells within the aggregated set. Instead of enforcing uniform configuration across all cells, the system permits each cell to have its own configuration number (0-6), enabling tailored resource allocation that matches local traffic patterns and interference conditions while maintaining overall system coherence through the timing relationship definition.
2Adaptability or versatility
If different uplink-downlink configurations are allowed across aggregated cells, then resource allocation flexibility is improved, but interference issues and system complexity increase
Solution Approach 1:
The patent implements universality by defining a common timing relationship framework that works across all possible uplink-downlink configuration combinations (0-6). The invention provides a universal method for determining timing relationships between downlink subframes and uplink feedback subframes that is applicable regardless of which specific configurations are used in aggregated cells, thereby managing complexity through standardization while preserving flexibility.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the uplink-downlink configuration numbers (0-6) across different cells and defining corresponding timing relationships. The invention manages complexity by establishing rules for how timing offsets change based on configuration parameters, allowing the system to adapt to different parameter combinations while maintaining controlled and predictable behavior through the defined timing relationships.
3Device complexity
If identical configurations are enforced across all aggregated cells, then implementation complexity is reduced, but the ability to optimize for specific traffic patterns and interference conditions is limited
Solution Approach 1:
The patent applies dynamics by enabling the system to adaptively select and switch between different uplink-downlink configurations (0-6) for aggregated cells based on real-time traffic patterns, interference conditions, and resource allocation needs. The timing relationship definitions allow dynamic reconfiguration without requiring complete system redesign, enabling the network to optimize resource allocation efficiency while maintaining manageable complexity through standardized timing rules.
Data Source
AI summary
Example embodiments presented herein are directed towards a base station and method therein, for configuring control timing to and from a user equipment in a multiple component cell communications network. Example embodiments presented herein are also directed towards a user equipment and method therein, for configuration of control timing for a user equipment in a multiple component cell communications network.