UE In-Device Interference Suppression via Dynamic Uplink Switching
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Solution Overview
Problem
In LTE-NR dual connectivity, intermodulation distortion and higher harmonics can cause in-device interference due to uplink transmissions, particularly in systems using different radio access technologies (RATs), leading to interference within the user equipment, especially with the NR system's wide bandwidths being susceptible to such issues.
Innovation Solution
User equipment is equipped with an interference notification generating part to detect and report in-device interference, a sending/receiving part to communicate with base stations, and a switching part to adjust uplink transmission schemes based on received responses, allowing for interference suppression by reallocating frequency domains or deactivating secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual connectivity is implemented between LTE and NR systems with simultaneous uplink transmissions, then data transmission capacity is improved, but in-device interference occurs due to intermodulation distortion and higher harmonics
Solution Approach 1:
The patent implements time-division multiplexing where uplink transmissions to LTE and NR base stations are performed in alternating time slots rather than simultaneously. The switching part switches between first uplink transmission to LTE and second uplink transmission to NR based on timing information, ensuring that transmissions are periodic and non-overlapping in time, thereby preventing intermodulation distortion while maintaining dual connectivity data capacity
Solution Approach 2:
The patent dynamically adjusts the uplink transmission scheme by switching between simultaneous transmission mode and time-division transmission mode based on detected interference conditions. The switching part changes transmission parameters in real-time based on feedback from the sending/receiving part about interference levels, making the system adaptive to prevent in-device interference while maximizing data transmission capacity
2Speed
If wide bandwidth is used in NR system, then data transmission rate is improved, but susceptibility to intermodulation distortion increases
Solution Approach 1:
The patent segments the uplink transmission bandwidth by allocating different frequency resources for LTE and NR transmissions at different time slots. The resource allocation part divides available spectrum resources such that NR wideband transmissions and LTE transmissions do not occur simultaneously in overlapping frequency ranges, reducing intermodulation distortion while preserving NR's high data transmission rate capability through its wide bandwidth
Data Source
AI summary
User equipment communicates with a first base station apparatus included in a first radio communication system and a second base station apparatus included in a second radio communication system, and includes an interference notification generating part that generates an interference notification including information indicating that an device-internal interference at the user equipment is detected or that resolution of device-internal interference is detected; a sending/receiving part that sends the interference notification to the first base station apparatus or the second base station apparatus, and receives a response to the interference notification from the first base station apparatus or the second base station apparatus; and a switching part that switches an uplink transmission scheme based on the response of the interference notification.