Inter-RAT Interference Cancellation in CV2X Networks
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Solution Overview
Problem
Current methods for inter-radio access technology interference cancellation in wireless communications, such as estimating channel interference on pilot signals, are complex and introduce latency, leading to high power consumption and temperature issues in cellular vehicle-to-everything (CV2X) applications.
Innovation Solution
The proposed solution involves a UE taking interference measurements when no CV2X signal is present, estimating noise plus interference during a symbol period, and applying this estimation to subsequent subframes to improve noise whitening, thereby reducing computational complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference measurements are taken continuously to improve interference cancellation accuracy, then interference statistics estimation is improved, but power consumption increases
Solution Approach 1:
The patent performs interference measurements during the last symbol of a subframe in advance, before decoding the actual CV2X data in subsequent subframes. This preliminary measurement allows the UE to have interference statistics ready when needed for decoding, improving accuracy without requiring continuous measurements during data reception.
Solution Approach 2:
The patent implements periodic interference measurements at specific intervals (during the last symbol of each subframe) rather than continuous measurements. This periodic approach maintains adequate interference statistics estimation while significantly reducing power consumption compared to continuous measurement schemes.
2Reliability
If complex interference cancellation methods are used to improve decoding reliability, then CV2X transmission reliability is improved, but computational complexity increases
Solution Approach 1:
The patent performs interference measurements and estimates interference statistics during the last symbol of the previous subframe in advance. This preliminary estimation is then applied to decode CV2X data in subsequent subframes, improving decoding reliability without requiring complex real-time interference cancellation during the actual data decoding process.
Solution Approach 2:
The patent uses the UE's own received signal during the last symbol (which contains primarily interference since CV2X transmission is absent) to self-estimate the interference statistics. This self-service approach eliminates the need for external interference measurement resources or complex cooperative measurement schemes, reducing computational complexity while maintaining reliability.
3Reliability
If interference measurements are taken during CV2X signal transmission to improve real-time interference cancellation, then interference cancellation accuracy is improved, but measurement precision is degraded due to signal presence
Solution Approach 1:
The patent performs interference measurements during the last symbol of the previous subframe, when CV2X transmission is absent. This timing allows the UE to measure interference without contamination from CV2X signals, ensuring measurement precision. The measured interference statistics are then applied in advance to improve interference cancellation accuracy during subsequent data decoding.
Solution Approach 2:
The patent inverts the conventional approach by measuring interference when CV2X signals are NOT present (during the last symbol with no CV2X transmission) rather than during CV2X transmission. This inverted timing strategy ensures that interference measurements are not contaminated by CV2X signals, maintaining measurement precision while still enabling accurate interference cancellation during data reception.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method may include an interference estimation procedure that measures interference from radio access technologies (RATs) different from cellular vehicle to everything (CV2X) on the CV2X network at a user equipment (UE). A UE may record measurements of interference on the CV2X network when no CV2X signal is present during the last symbol of a subframe. Then, the UE may estimate the noise plus interference measured during the empty symbol to improve noise plus interference whitening when decoding a subframe.