Coordinated Beam Switching for Interference Management
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Solution Overview
Problem
Communication networks face sub-optimal performance due to random fluctuations in interference levels caused by uncoordinated precoded transmissions, leading to inaccurate signal-to-interference-plus-noise ratio (SINR) measurements and inefficient modulation and code scheme selection, as well as the flashlight effect, where channel quality changes unpredictably due to beam direction changes in adjacent cells.
Innovation Solution
The implementation of coordinated beam switching (CBS) techniques, which involve restricting data signaling directions based on timing to minimize interference and utilize static cycling of beams by co-located cells, allowing for deterministic scheduling and reduced multi-user diversity losses, while also employing multi-dimensional outer loop link adaptation (MD-OLLA) to refine channel quality feedback and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uncoordinated precoded transmissions are used in neighboring cells, then device complexity is reduced, but interference levels fluctuate randomly causing inaccurate SINR measurements
Solution Approach 1:
The patent applies periodic beam patterns where cells cycle through predetermined beam directions in a coordinated manner. Each cell follows a periodic sequence of beam patterns, creating predictable interference patterns that allow UEs to accurately measure and report CQI/SINR values. This periodic coordination resolves the contradiction by maintaining low complexity through predefined patterns while achieving accurate measurements through predictability.
Solution Approach 2:
The patent changes the temporal parameter of beam direction by cycling through different beam patterns over time. Instead of static or random beam directions, the system uses time-varying beam patterns with specific periodicities, transforming the interference environment from unpredictable to predictable, thereby improving SINR measurement accuracy without increasing coordination complexity.
2Object-affected harmful factors
If fixed beam patterns are assigned to time/frequency resources, then interference coordination is improved, but multi-user diversity gains are lost due to restricted scheduling flexibility
Solution Approach 1:
The patent introduces dynamic beam switching within a coordinated framework. While beam patterns are predetermined and periodic, the system dynamically selects which beams to use based on UE feedback and scheduling requirements. This dynamic adaptation within the periodic structure allows the system to maintain interference coordination benefits while recovering multi-user diversity gains through flexible scheduling.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report CQI values based on measured interference conditions from periodic beam patterns. The base station uses this feedback to adjust scheduling decisions and beam selections, creating a closed-loop system that optimizes both interference coordination and throughput by adapting to real-time channel conditions while maintaining the underlying periodic coordination structure.
3Object-affected harmful factors
If coordinated beam switching is implemented across all cells, then interference management is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the network into groups of cells that share common beam patterns, rather than requiring all cells to coordinate simultaneously. This segmentation allows independent coordination within each group, reducing overall system complexity while maintaining effective interference management within localized cell groups. The segmentation principle divides the complex global coordination problem into manageable local coordination tasks.
Data Source
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AI summary
An apparatus, computer program, and method are provided for timing-based restriction of a data signaling direction. An operating cell is included in at least one of a plurality of groups with one or more other cells. In operation, a time is identified for restricting a direction of data signaling from the cell to a region, based on such time, while at least one of the one or more other cells of the at least one group is permitted to direct a data signaling thereof outside the region.