In-Device Coexistence Interference Handling in User Equipment
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Solution Overview
Problem
In-device coexistence interference occurs when multiple radio technologies, such as LTE and non-LTE modules, operate simultaneously in user equipment, causing interference between frequency bands, which existing methods have not adequately addressed.
Innovation Solution
A method and system that utilize a coordinator in user equipment to detect and report in-device coexistence interference, allowing the network entity to configure either Frequency Division Multiplexing (FDM) or Time Division Multiplexing (TDM) solutions to mitigate interference by adjusting measurement patterns and scheduling to minimize interference between LTE and non-LTE frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio technologies operate simultaneously in user equipment, then service versatility is improved, but in-device coexistence interference occurs between frequency bands
Solution Approach 1:
The patent segments the operation of multiple radio technologies by dividing time into distinct periods through measurement gaps. During these gaps, one radio technology is active while others are inactive, preventing simultaneous interference. This temporal segmentation allows multiple radios to coexist without interference while maintaining service versatility.
Solution Approach 2:
The patent implements periodic measurement gaps in the operation schedule of radio technologies. These periodic inactive periods allow conflicting radio technologies to take turns operating, with LTE radio operating during normal periods and other radios operating during measurement gaps. This periodic action pattern eliminates continuous interference while maintaining all services.
2Productivity
If LTE radio operates continuously for high-speed data transfer, then productivity is improved, but interference occurs with other radio technologies operating in adjacent frequency bands
Solution Approach 1:
The patent introduces measurement gaps as preliminary inactive periods for LTE radio before other radio technologies need to operate. By proactively scheduling these gaps in advance, the system prevents interference to other radios while minimizing impact on LTE productivity. The network can calculate and notify upcoming gaps, allowing data transfer to be optimized around these predetermined intervals.
Solution Approach 2:
The patent makes the LTE radio operation dynamic by allowing the network to calculate and adjust measurement gap patterns based on traffic conditions and interference requirements. The UE can be configured with different measurement gap patterns (e.g., every 40ms or 80ms) depending on conditions, enabling flexible adaptation between productivity and interference avoidance.
3Object-affected harmful factors
If measurement gaps are introduced for other radio technologies to operate, then in-device coexistence interference is reduced, but LTE productivity decreases due to inactive periods
Solution Approach 1:
The patent changes the temporal parameters of LTE operation by introducing measurement gaps with specific durations and periodicities. By adjusting gap patterns (e.g., 6ms gap every 40ms or 80ms), the system optimizes the balance between allowing other radios to operate and maintaining LTE productivity. The network can select gap patterns that minimize impact on data transfer while ensuring interference avoidance.
Data Source
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AI summary
The present invention relates to method and system for handling in-device coexistence interference in the user equipment. The method includes the steps of detecting in-device coexistence interference between one or more of a plurality of carrier frequencies of Long Term Evolution (LTE) radio technology and at least one frequency of non-LTE radio technologies, determining at least one of the one or more LTE carrier frequencies for which a measurement object is configured, and transmitting interference information associated with the at least one LTE carrier frequency affected by the in-device coexistence interference. The interference information includes a measurement object identifier of the at least one carrier LTE frequency, Direction of Interference (DOI), and time domain multiplexing assistance information. The method further includes receiving a configured solution from the network entity which help mitigate the in-device co-existence interference at the user equipment.