Dual ISM Band Interference Mitigation via Frequency Diversity
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Solution Overview
Problem
The increasing congestion in the 2.4 GHz ISM band due to microwave oven radiation and other devices leads to performance degradation in wireless data transmission, as existing interference avoidance techniques are ineffective against broad-band interference sources.
Innovation Solution
A dual ISM band frequency diversity method where data packets are transmitted in both the 2.4 GHz and 5.8 GHz bands, using a detector to identify interference and assigning time slots and channels to avoid interference by transmitting data twice, once in each band, with time slots separated by the average duration of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data transmission is performed in the 2.4 GHz ISM band, then wireless communication availability is improved, but interference from microwave ovens and other devices causes performance degradation
Solution Approach 1:
The patent transitions from single-band transmission to dual-band transmission by adding a second frequency dimension (5.8 GHz ISM band) to the existing single-band (2.4 GHz ISM band) approach. This dimensional expansion allows the system to overcome broad-band interference sources like microwave ovens that occupy the entire 2.4 GHz band, as interference in one band does not necessarily affect the other band.
Solution Approach 2:
The patent changes the frequency parameter by utilizing multiple ISM bands (2.4 GHz and 5.8 GHz) instead of a single band. This parameter change enables the system to avoid interference by selecting different frequency parameters for transmission, thereby maintaining communication availability despite the presence of harmful interference sources.
2Object-affected harmful factors
If dynamic channel allocation is used to avoid interference, then interference between devices is reduced, but the increasing number of devices limits effectiveness
Solution Approach 1:
The patent adds a second frequency dimension (5.8 GHz ISM band) to the traditional single-band dynamic channel allocation approach. This dimensional expansion provides additional channels and frequency options, thereby maintaining effectiveness against increasing numbers of devices while using the same dynamic allocation strategy.
3Reliability
If data is transmitted twice in separate frequency bands, then reliability against interferers is improved, but transmission complexity increases
Solution Approach 1:
The patent segments the transmission process into separate time slots for different frequency bands. By dividing the transmission timeline into distinct segments (first time slot for 2.4 GHz, second time slot for 5.8 GHz), the system achieves reliable transmission through frequency diversity while managing complexity through temporal separation of operations.
Solution Approach 2:
The system performs preliminary detection of interference conditions before transmission. By detecting interference signals and determining their duration in advance, the system can pre-arrange the transmission schedule to avoid interference, thereby achieving reliable transmission without requiring complex real-time adaptive mechanisms.
4Object-affected harmful factors
If time slots are separated by duration greater than average interference duration, then interference likelihood is reduced, but transmission time increases
Solution Approach 1:
The system performs preliminary detection of interference signals and calculates their average duration before scheduling transmissions. This preliminary action allows the system to set appropriate time slot separations based on actual interference characteristics, thereby reducing interference likelihood while minimizing unnecessary time delays.
Solution Approach 2:
The patent uses a predetermined threshold value for interference detection rather than requiring continuous monitoring. This partial action approach (detecting interference only when it exceeds the threshold) reduces the time and computational resources required for interference detection while still providing adequate protection against interference.
Data Source
AI summary
A device for transmitting data packets over a data link, including an interference signal detector adapted to continually detect a frequency of interference signals on the data link, designator adapted to assign a first frequency channel and a first time slot on the data link, wherein the first frequency channels lies within a 2.4 GHz industrial scientific and medical (ISM) band, and adapted to assign a second frequency channel and a second time slot on the data link, wherein the second frequency channel lies within a 5.8 GHz ISM Band, transmitter adapted to transmit each data packet within the first time slot and the first frequency channel and within the second time slot and the second frequency channel, if the frequency of the interference signals lies within the 2.4 GHz or the 5.8 GHz band.