Dynamic Special Subframe Allocation for Interference Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Heterogeneous wireless communication systems face challenges in managing interference and optimizing resource allocation, particularly in heterogeneous networks where low-power nodes introduce imbalances in uplink and downlink coverage and create interference issues due to geographic changes in data traffic demand.
Innovation Solution
The implementation of dynamic special subframe allocation in wireless communication systems, allowing for flexible time and frequency resource partitioning, interference management through resource partitioning, and adaptive interference cancellation techniques to mitigate interference and enhance system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If low-power nodes are deployed to extend coverage, then coverage area is improved, but interference increases and resource allocation becomes unbalanced
Solution Approach 1:
The patent implements dynamic special subframe allocation where the ratio of special subframes (with reduced downlink transmission) to normal subframes is adjusted based on real-time traffic load and interference conditions. This dynamic adjustment allows the system to adapt to changing network conditions, balancing coverage extension with interference management in heterogeneous networks containing both macro and low-power nodes.
Solution Approach 2:
The patent changes the parameter of subframe configuration by introducing configurable special subframes with different downlink-to-uplink ratios. By modifying the time-domain resource allocation parameters (special subframe configuration indices 0-9), the system can control the amount of downlink transmission in special subframes, thereby managing interference from low-power nodes while maintaining coverage.
2Object-generated harmful factors
If special subframes with reduced downlink transmission are used, then interference is reduced, but downlink capacity decreases
Solution Approach 1:
The system dynamically adjusts the proportion of special subframes based on traffic load conditions. When downlink traffic demand is high, the ratio of normal subframes is increased to maintain capacity. When interference is the dominant issue, the ratio of special subframes is increased to reduce interference. This dynamic balancing allows the system to optimize both interference management and downlink capacity based on real-time conditions.
Solution Approach 2:
The patent employs periodic special subframes within a configured pattern (repeating every radio frame or multiple frames). This periodic structure allows normal downlink transmission in most subframes while periodically inserting special subframes with reduced downlink transmission to manage interference, thereby maintaining overall downlink capacity while controlling interference levels.
3Object-generated harmful factors
If resource partitioning is implemented to manage interference, then interference management is improved, but system complexity increases
Solution Approach 1:
The patent segments the downlink transmission resources by creating special subframes with reduced downlink transmission. This segmentation divides the time-domain resources into normal subframes (full downlink transmission) and special subframes (reduced downlink transmission), providing a structured approach to interference management that is easier to implement and manage than continuous resource partitioning schemes.
Data Source
AI summary
Wireless communications are described. Reduced transmission power time intervals may be employed in communications via one or more cells. A wireless device may receive an indication of measurement resources for one or more cells. The wireless device may transmit channel state information for one or more of the cells. Cross carrier scheduling may be employed.