In-Device Interference Mitigation in 5G User Equipment
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Solution Overview
Problem
In 5G networks, in-device interference between LTE and NR radio frequency transceivers in user equipment (UE) occurs due to harmonic and intermodulation interference, affecting communication quality and user experience.
Innovation Solution
A method and apparatus where the base station adjusts frequency-domain resource configurations to prevent in-device interference by determining potential interference based on UE's radio frequency support capabilities and scheduling policies, adjusting uplink and downlink resource allocations, and modifying frequency ranges to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE and NR radio frequency transceivers operate simultaneously in the UE, then data transmission services are enhanced, but in-device interference occurs due to harmonic and intermodulation effects
Solution Approach 1:
The base station determines whether in-device interference is likely to occur before scheduling uplink and downlink transmissions. By performing interference prediction in advance based on UE's radio frequency support capabilities and current resource allocations, the system can proactively adjust scheduling decisions to prevent interference rather than reacting after it occurs.
Solution Approach 2:
The base station adjusts frequency-domain resource configurations by modifying frequency ranges, bandwidth allocations, or resource block assignments for uplink or downlink transmissions. By changing these frequency parameters dynamically based on interference conditions, the system resolves the contradiction between maintaining simultaneous LTE-NR operation and preventing harmful interference.
2Productivity
If the base station schedules transmission resources using a predefined scheduling manner, then resource allocation efficiency is maintained, but in-device interference may occur due to overlapping frequency multiplications
Solution Approach 1:
The base station uses feedback from the UE regarding radio frequency support capabilities and current transmission conditions to make informed scheduling decisions. This feedback mechanism allows the system to maintain efficient resource allocation while adapting to specific UE characteristics that may be prone to in-device interference, thereby preserving both productivity and reliability.
Solution Approach 2:
The scheduling approach transitions from static predefined patterns to dynamic adaptive scheduling. The base station continuously evaluates interference likelihood based on current resource allocations, UE capabilities, and frequency configurations, adjusting scheduling decisions in real-time to balance resource allocation efficiency with communication quality assurance.
3Quantity of substance
If uplink transmission resources are allocated in overlapping frequency ranges, then frequency spectrum utilization is improved, but intermodulation interference is generated affecting downlink reception
Solution Approach 1:
Instead of uniformly restricting uplink transmissions across all frequency ranges, the base station applies localized frequency adjustments only in specific frequency regions where intermodulation interference is predicted. This allows the system to maintain high frequency spectrum utilization in safe regions while preventing harmful interference in vulnerable regions, resolving the contradiction between quantity of spectrum usage and harmful factor generation.
Data Source
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AI summary
The present disclosure provides a method and apparatus for transmitting information. The method includes: determining whether in-device interference is likely to occur in user equipment; when the in-device interference is likely to occur, determining a target frequency range involved in the in-device interference, the target frequency range including a target downlink frequency range and at least one target uplink frequency range; adjusting a transmission resource configuration within the target frequency range; and transmitting information over a transmission resource after adjustment of the transmission resource configuration within the target frequency range, to avoid occurrence of the in-device interference. With the method for transmitting information according to the present disclosure, the base station may effectively prevents the in-device interference by adjusting the frequency-domain resource, such that the interference caused by uplink transmission to downlink transmission may be effectively prevented while the user equipment transmits information by simultaneously using different radio frequency transceiver units within different operating frequency ranges.