In-Device Interference Mitigation via Frequency Segmentation
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Solution Overview
Problem
Current wireless devices supporting multiple radio technologies experience significant interference due to the coexistence of technologies like LTE, ISM, and GPS, which existing filter technologies fail to adequately mitigate, leading to performance issues.
Innovation Solution
A system and method to detect interference between radio access technology components in wireless devices, allowing for proactive or reactive notifications to be sent to a network or for the device to autonomously mitigate interference by adjusting configurations and protocols, thereby reducing mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio technologies (LTE, ISM, GPS) are supported in a wireless device, then the capabilities and functionality of the device are increased, but interference between adjacent bands and frequencies is generated
Solution Approach 1:
The patent segments the radio frequency spectrum into distinct bands and assigns different radio technologies to specific bands. By dividing the frequency spectrum and allocating technologies like LTE, ISM, and GPS to separate frequency ranges, the system reduces mutual interference while maintaining support for multiple radio technologies.
Solution Approach 2:
The patent applies local quality by configuring specific frequency bands and transmission parameters for each radio technology based on its operational requirements. Different technologies receive optimized frequency allocations and power settings tailored to their specific needs, reducing interference while maximizing performance.
2Object-generated harmful factors
If filter technologies such as active band pass filters are employed to mitigate interference, then some interference reduction is achieved, but sufficient rejection of adjacent bands and frequencies is not provided
Solution Approach 1:
The patent introduces frequency selective surfaces and shielding structures as intermediary elements between different radio technology components. These intermediaries provide additional frequency-selective filtering and electromagnetic shielding, enhancing the rejection of adjacent bands beyond what active band pass filters alone can achieve.
3Adaptability or versatility
If LTE technologies operate in band 40 (2.3-2.4 GHz) while ISM and GPS technologies operate on adjacent bands, then diverse radio capabilities are maintained, but transceivers generate mutual interference
Solution Approach 1:
The patent segments the device into separate radio modules with dedicated frequency ranges. LTE transceivers are confined to band 40 (2.3-2.4 GHz), while ISM and GPS transceivers operate in adjacent but separated bands. This spatial and spectral segmentation prevents transceiver interference while preserving diverse radio capabilities.
Solution Approach 2:
The patent implements time-division multiplexing where different radio technologies are activated periodically in alternating time slots. When LTE transmission occurs in band 40, ISM and GPS activities are temporarily suspended, and vice versa. This periodic action reduces mutual transceiver interference while maintaining overall system functionality.
Data Source
AI summary
Methods and apparatus for mitigating in-device interference are described. The methods may include an in-device interference event (e.g. an interference situation), and the processing of events may depend on the priority of the technologies. A handover to another frequency or radio access technology (RAT) may occur in case a co-existing technology may be activated. The network may signal to the device a list of frequencies or RATs that it may be allowed to measure and handoff to. A network may provide a scaling value that the device may use to speed up reaction to the interference. The device may apply a scaling factor to an “out of synch’ counter and/or the radio link failure (RLF) timer used for the RLF procedure. The device may apply different scaling factors for the measurements and time to trigger events. The device may trigger a report to the network requesting gaps for an alternate RAT.