Transceiver Interference Mitigation via Dynamic Frequency Selection
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Solution Overview
Problem
In wireless telecommunication systems, the coexistence of multiple radio systems operating in the same or close radio spectra is challenging due to interference from incumbent and future communication systems, as well as non-communication sources, with existing methods like filtering and time division often resulting in performance degradation or poor spectrum utilization.
Innovation Solution
A communication device with multiple transceivers can assess interference and request frequency changes or power adjustments to mitigate interference, utilizing band select filters to allocate interfering systems to frequencies with higher attenuation, thereby maintaining receiver performance thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering is used to separate different frequency bands, then interference between systems is reduced, but insertion loss degrades receiver sensitivity
Solution Approach 1:
The patent implements dynamic frequency selection where the receiver continuously monitors interference levels across different frequency bands and adapts its operating frequency in real-time. This dynamic adaptation allows the system to avoid frequencies with high interference while maintaining optimal receiver sensitivity, resolving the contradiction between interference reduction and sensitivity preservation
Solution Approach 2:
The system employs feedback mechanisms where the receiver measures the actual interference environment and uses this information to adjust its operating parameters. The receiver provides feedback about interference levels to the frequency selection algorithm, which then adjusts the operating frequency to minimize interference impact while maintaining acceptable sensitivity performance
2Object-affected harmful factors
If time division is used to separate transmissions, then interference is avoided, but spectrum utilization efficiency decreases
Solution Approach 1:
Instead of separating transmissions only in the time dimension (time division), the patent introduces frequency as an additional dimension for separation. The system dynamically selects different frequency bands for different transmitters based on real-time interference measurements, enabling spatial-frequency domain separation that maintains high spectrum utilization while avoiding interference
Solution Approach 2:
The system changes the operating frequency parameter dynamically based on the measured interference environment. Rather than fixed time-division scheduling, the frequency parameter is adjusted in real-time to allow simultaneous transmissions at different frequencies, thereby maintaining high spectrum utilization while preventing interference
3Object-affected harmful factors
If frequency separation is used to isolate systems, then interference is reduced, but device complexity increases due to filtering requirements
Solution Approach 1:
The system uses the transmitted signals themselves as the basis for interference measurement and frequency selection. Each transmitter announces its presence and operating parameters, and receivers use this information to autonomously select interference-free frequencies. This self-service approach eliminates the need for complex external filtering hardware while achieving effective interference reduction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient coexistence of different radio communication systems by reducing interference and maintaining performance, while avoiding the limitations of traditional filtering and time division methods.
Implementation Method 1
utilizing band select filters to allocate interfering systems to frequencies with higher attenuation
Data Source
AI summary
A communication device has a plurality of concurrently operating transceivers, each operating in a respectively different one of a plurality of communication systems, wherein the plurality of concurrently operating transceivers includes a first transceiver and a second transceiver. Operation of the communication device includes the first transceiver ascertaining whether transmissions by the second transceiver are causing interference in a receiver of the first transceiver and if so, performing one or more interference response actions. The one or more interference response actions include ascertaining whether the interference is at an acceptable level and if so then taking no further interference response actions. If the interference is ascertained to be at an unacceptable level, an interference mitigation request is communicated to the second transceiver. The second transceiver can, for example, shift its use of frequencies to a region whereby the first transceiver's band select filter can sufficiently attenuate the second transceiver's signal.