Multi-SIM Wireless Device Interference Management
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Solution Overview
Problem
Multi-SIM wireless devices experience radio frequency interference between simultaneously active radio systems, leading to issues like dropped calls, poor speech call quality, and data service disruptions due to close carrier frequencies and varying transmission powers.
Innovation Solution
A method and device that allow radio systems in a multi-SIM wireless device to indicate transmission activities, measure or estimate interference, and modify behavior to reduce interference by adjusting transmission power, carrier usage, or suspending transmissions, prioritizing certain operations and using error correction techniques to ensure better reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio systems operate simultaneously in a multi-SIM device, then communication versatility and service availability are improved, but radio frequency interference between systems increases causing dropped calls and poor speech quality
Solution Approach 1:
The system performs preliminary actions by measuring or estimating interference levels before actual communication occurs. The base station measures interference caused by simultaneous radio transmissions and uses this information to pre-adjust transmission parameters, thereby preventing interference-related problems before they affect communication quality.
Solution Approach 2:
The system implements feedback mechanisms where the base station continuously monitors interference levels between simultaneous radio systems and adjusts transmission parameters accordingly. This closed-loop control allows the system to adapt to changing interference conditions and maintain communication quality despite multiple active radio systems.
2Reliability
If transmission power is increased to improve signal strength, then communication range and reliability are improved, but interference to other radio systems increases
Solution Approach 1:
The system dynamically adjusts transmission power levels based on real-time interference measurements. Rather than using fixed high power, the base station modulates transmission power to achieve reliable communication while minimizing interference to other simultaneous radio systems, optimizing the balance between reliability and harmful effects.
Solution Approach 2:
The system changes transmission parameters including power levels, timing, and frequency allocation based on measured interference conditions. By varying these parameters dynamically, the system can maintain communication reliability while reducing the harmful interference generated by high-power transmissions.
3Adaptability or versatility
If carrier frequencies are selected to maximize available services, then service diversity is improved, but frequency proximity causes increased interference between radio systems
Solution Approach 1:
The system performs preliminary analysis of available carrier frequencies and their potential interference characteristics before selecting frequencies for simultaneous radio systems. By pre-evaluating frequency proximity and potential interference, the system can select optimal frequency combinations that maximize service diversity while minimizing interference.
Solution Approach 2:
The base station continuously monitors the actual interference levels resulting from selected carrier frequency combinations and uses this feedback to adjust frequency allocation and transmission parameters. This allows the system to optimize frequency selection for service diversity while compensating for interference effects.
Data Source
AI summary
A wireless device has at least first and second radio systems. A first of the radio systems provides an indication for a second of the radio systems that it is transmitting or is about to transmit. The actual interference caused by transmissions by the first radio system to operation of the second radio system is measured, and/or the likely interference caused by transmissions by the first radio system to operation of the second radio system is estimated. The behavior of at least one of the first and second radio systems is modified in order to reduce the interference depending on the measured actual interference or estimated likely interference.