Single Scrambling Sequence for Multi-Cell Control Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing PDCCH in LTE-Advanced systems is inflexible and unable to coordinate control signal transmissions effectively across cells with different serving cells, leading to capacity bottlenecks, especially in scenarios involving carrier aggregation and CoMP techniques.
Innovation Solution
A radio communication system that uses a single scrambling sequence for multiple cells and user terminals with different serving cells, allowing for efficient control signal transmission and reception, reducing reserved radio resource regions and minimizing message exchange among cooperating cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single scrambling sequence is provided to multiple cells and user terminals for control signal transmission, then control signal capacity and coverage are enhanced, but interference randomization capability is reduced
Solution Approach 1:
The patent merges the scrambling sequences across multiple cells by providing a single scrambling sequence to multiple cells and user terminals for control signal transmission. This combining approach enhances control signal capacity and coverage while the system manages interference through coordinated multi-point transmission schemes.
Solution Approach 2:
The single scrambling sequence serves multiple functions across different cells and user terminals simultaneously. It provides universal scrambling for control signals in coordinated multi-point transmission scenarios, enabling efficient resource utilization while maintaining system-wide interference management through higher-layer signaling coordination.
2Device complexity
If cell-specific reference signals are used for PDCCH demodulation, then control signal transmission is simplified, but flexibility for coordinating transmissions across multiple cells is lost
Solution Approach 1:
The patent introduces dynamic flexibility by allowing the scrambling initialization value to be configured through higher-layer signaling rather than being fixed by cell identity. This enables the system to adaptively coordinate transmissions across multiple cells while maintaining simplified demodulation through cell-specific reference signals, resolving the contradiction between simplicity and flexibility.
Data Source
AI summary
A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.