Wireless Terminal Interference Mitigation via Aperiodic Transmission Patterns
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Solution Overview
Problem
Periodic radio transmissions from wireless communication devices, such as those in 3GPP LTE systems, cause interference to companion devices like hearing aids and other electromagnetically coupled systems due to time-domain periodic repetitive patterns, which existing mitigation methods like randomization of HARQ processes do not fully address.
Innovation Solution
The wireless communication terminal identifies configurations leading to time-domain periodic repetitive patterns and selects alternative radio resources to avoid interference, using pseudo-random or quasi-continuous transmission patterns, and potentially reducing power levels or modifying transmission power profiles to minimize interference with companion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic radio transmissions are used for efficient communication, then communication efficiency is improved, but interference to companion devices increases
Solution Approach 1:
The patent applies dynamics by making the transmission pattern adaptable rather than fixed. The system dynamically adjusts between periodic and aperiodic transmission patterns based on data availability and interference conditions. The transmission timing becomes flexible, allowing the system to switch from rigid periodic intervals to adaptive timing that avoids creating harmful repetitive patterns while maintaining communication efficiency.
Solution Approach 2:
The patent changes the temporal parameters of transmission by introducing variable delays and jitter to the transmission timing. Instead of fixed periodic intervals, the system modifies transmission timing parameters to create aperiodic patterns. This parameter change transforms the transmission from a predictable repetitive pattern to a more random pattern that reduces interference while preserving communication functionality.
2Object-affected harmful factors
If randomization of HARQ processes is applied to reduce interference, then interference mitigation is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent applies partial randomization rather than complete randomization of HARQ processes. Instead of fully randomizing all transmissions, the system selectively applies randomization only when necessary to avoid interference patterns. This partial action approach maintains transmission reliability by preserving the structured HARQ process for normal operations while introducing just enough randomness to mitigate interference when periodic patterns are detected.
Solution Approach 2:
The system dynamically adjusts the degree of randomization applied to HARQ processes based on detected interference conditions. When periodic interference patterns are identified, the system increases randomization; when conditions are normal, it maintains standard HARQ timing. This dynamic adjustment preserves transmission reliability while providing interference mitigation capability when needed.
3Object-affected harmful factors
If transmission power is reduced to minimize interference, then interference to companion devices is reduced, but communication quality deteriorates
Solution Approach 1:
The patent segments the transmission power control into different operational modes. Instead of uniformly reducing power across all transmissions, the system maintains full power for essential communications while applying power reduction only to transmissions that would create harmful periodic patterns. This segmentation allows the system to preserve communication quality for critical data while reducing interference for problematic repetitive transmissions.
Solution Approach 2:
The system applies different power levels to different transmission instances based on local conditions. Transmissions that would create periodic interference patterns receive reduced power or are delayed, while other transmissions maintain full power. This local quality approach ensures that interference mitigation is applied selectively only where needed, preserving overall communication quality while reducing harmful effects on companion devices.
Data Source
AI summary
A method in a wireless communication terminal includes receiving configuration signaling for transmitting on a first set of radio resources wherein transmitting only on the first set of radio resources leads to a time-domain periodic repetitive pattern of transmissions from the terminal in a transmission interval that causes interference to a companion device communicably coupled to the wireless communication terminal. The terminals selects a second set of radio resources for transmitting on in the transmission interval such that transmissions on a combination of the second set of radio resources and the first set of radio resources does not lead to a periodic repetitive pattern of transmissions from the terminal in the transmission interval.