Wireless Channel Sounding with Dynamic Bandwidth Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel sounding, particularly at cell edges, leading to increased inter-cell interference and reduced channel estimation accuracy due to limited bandwidth and scheduling overhead, which affects CINR estimation and network performance.
Innovation Solution
Implementing a technique that allows for multiple sounding bandwidths and semi-static assignment of starting point indices for channel sounding, enabling efficient sounding across the entire uplink shared channel, reducing scheduling overhead and improving channel estimation accuracy by allowing simultaneous transmission of sounding RSs without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cell-edge SSs limit channel sounding bandwidth to reduce interference, then inter-cell interference is reduced, but channel estimation accuracy deteriorates
Solution Approach 1:
The system segments the channel sounding process by allowing non-cell-edge SSs to sound the entire system bandwidth with a single sounding symbol while cell-edge SSs sound only a portion of the bandwidth. This segmentation enables different bandwidth strategies for different SS types, reducing inter-cell interference for cell-edge SSs while maintaining full bandwidth sounding capability for non-cell-edge SSs, thus preserving channel estimation accuracy where applicable.
Solution Approach 2:
The patent introduces frequency hopping as an additional dimension to the channel sounding approach. Cell-edge SSs that sound a portion of the bandwidth in one sounding symbol can cover the entire system bandwidth by employing frequency hopping across multiple sounding symbols. This dimensional approach allows the system to reduce interference in each individual sounding instance while still achieving comprehensive channel coverage over time.
2Measurement precision
If cell-edge SSs use frequency hopping to cover entire bandwidth, then channel estimation accuracy is improved, but scheduling overhead increases
Solution Approach 1:
The system dynamically adapts the channel sounding bandwidth based on SS location. Non-cell-edge SSs use a static full-bandwidth approach with single sounding symbols, while cell-edge SSs use a dynamic portioned bandwidth approach with frequency hopping across multiple symbols. This dynamic adaptation allows the system to optimize between interference reduction and scheduling complexity based on actual SS positions and channel conditions.
3Device complexity
If non-cell-edge SSs sound entire bandwidth with single symbol, then scheduling overhead is reduced, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by implementing location-specific channel sounding strategies. Non-cell-edge SSs in areas where interference is less critical use full-bandwidth single-symbol sounding to minimize scheduling overhead. Cell-edge SSs in interference-sensitive regions use portioned bandwidth with frequency hopping. This local quality approach ensures that each SS type operates with the optimal bandwidth strategy for its specific deployment context, balancing overhead and interference locally.
Data Source
AI summary
A technique of operating a wireless communication device includes receiving an assigned starting point index and an assigned reference signal bandwidth for a reference signal. The reference signal is then transmitted multiple times, beginning at an initial resource block that is associated with the assigned starting point index and in accordance with the assigned reference signal bandwidth, across a shared channel.