Mobile Station Interference Reduction via Parameter Adjustment
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Solution Overview
Problem
Wireless communication systems face interference issues due to harmonics and wideband noise from coexisting wireless technologies in mobile devices, such as GSM and WLAN, which complicates filtering and increases power consumption in mobile stations.
Innovation Solution
A method where a mobile station determines if changing transmission parameters would reduce interference to secondary receivers and sends a message to the wireless communication network to adjust communication parameters, such as frequency bands or modulation methods, to minimize interference, potentially initiating a handover to a different channel or network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering structures are added to remove unwanted harmonics, then interference reduction is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the harmful harmonics from the transmission signal by using a harmonic filter connected in parallel with the transmission line. The filter selectively removes specific harmonic frequencies (e.g., 3rd, 5th harmonics) while allowing the fundamental frequency to pass through, thereby reducing interference without significantly increasing overall device complexity
Solution Approach 2:
The patent introduces an intermediary harmonic filter component that mediates between the transmitter and the receiver. This filter acts as a mediator that selectively attenuates harmful harmonic frequencies while maintaining the integrity of the fundamental transmission signal, thus reducing interference without requiring complete system redesign
2Object-affected harmful factors
If high quality filters are built for 5 GHz WLAN frequency band, then filtering performance is improved, but manufacturing difficulty increases due to self-resonance effects and parasitic capacitances
Solution Approach 1:
The patent changes the design parameters of the filter to operate effectively at 5 GHz frequency band. By adjusting the inductance and capacitance values of the filter components, the filter is tuned to resonate at specific harmonic frequencies while maintaining broadband operation. This parameter optimization allows the filter to achieve high performance without being overly sensitive to manufacturing tolerances
Solution Approach 2:
The patent employs a broadband filter design that dynamically adapts to the wide 675 MHz bandwidth of the 5 GHz WLAN band. The filter structure incorporates multiple resonant elements with different frequency responses that collectively provide effective harmonic rejection across the entire operating band, making the design more robust to manufacturing variations
3Object-affected harmful factors
If extra filtering is added to reduce transmitter interference to second service, then interference reduction is achieved, but receiver insertion loss increases and sensitivity decreases
Solution Approach 1:
The patent segments the filtering function into two separate components: a harmonic filter on the transmitter side to remove harmful frequencies before transmission, and a broadband filter on the receiver side to provide isolation without significant insertion loss. This segmentation allows each filter to be optimized for its specific function, maintaining receiver sensitivity while reducing interference
4Object-affected harmful factors
If broadband filtering is implemented for 5 GHz WLAN band with 675 MHz bandwidth, then wideband interference is reduced, but filter design complexity increases
Solution Approach 1:
The patent merges multiple filtering functions into a single broadband filter structure. By combining multiple resonant elements and using a coupled-resonator topology, the filter achieves effective harmonic rejection across the entire 675 MHz bandwidth without requiring multiple separate filter stages, thus reducing overall design complexity while maintaining broadband performance
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 reduces interference and power consumption by allowing the network to adjust transmission parameters, thereby improving the reception quality of secondary services like WLAN and GPS, and optimizing spectrum usage.
Implementation Method 1
a first transmitter (52) and a first receiver (54) for communicating with a wireless communication network on at least a first frequency band
Implementation Method 2
a second receiver (64) for receiving transmissions on at least a second frequency band
Implementation Method 3
determining if changing of a transmission parameter of the mobile station would cause less interference to reception by the second receiver
Data Source
AI summary
This invention relates to wireless communication systems, specifically to methods for reducing interference. The invention allows a mobile station to determine if certain transmissions of the mobile station cause interference to reception by a second receiver in the mobile station, and indicate to the network that a change in a transmission parameter of the mobile station is desired. The network can then change a transmission parameter to reduce interference observed by the second receiver.