Intermodulation Interference Mitigation in Multi-Band Carrier Aggregation
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Solution Overview
Problem
Current wireless communication networks, particularly those using LTE and 5GNR with multi-band Carrier Aggregation, face inefficiencies in mitigating intermodulation interference, which degrades signal quality across different frequency bands.
Innovation Solution
A wireless access point measures intermodulation interference in secondary 5GNR bands and terminates specific LTE secondary component carriers when interference thresholds are exceeded, effectively mitigating interference and maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-band carrier aggregation is used to increase bandwidth and data speed, then network capacity and throughput are improved, but intermodulation interference is generated that degrades signal quality
Solution Approach 1:
The system continuously measures intermodulation interference levels in secondary 5GNR bands and uses this feedback to dynamically adjust carrier aggregation configuration. When interference exceeds thresholds, the system terminates affected LTE secondary component carriers, creating a closed-loop control mechanism that adapts to changing interference conditions while maintaining optimal network performance
Solution Approach 2:
The system changes operational parameters by dynamically terminating or activating specific LTE secondary component carriers based on measured interference levels. This parameter adjustment allows the system to optimize the balance between bandwidth utilization and signal quality by selectively modifying which carriers are active in the carrier aggregation configuration
2Quantity of substance
If multiple LTE secondary component carriers are aggregated with 5GNR carriers, then network capacity increases, but interference measurement and management complexity increases
Solution Approach 1:
The system applies differentiated interference management to specific frequency bands and carriers rather than uniformly across all carriers. By measuring and evaluating interference on a per-carrier or per-band basis and selectively terminating only the affected carriers, the system manages complexity locally rather than system-wide, maintaining simplicity while handling multi-band carrier aggregation
3Power
If intermodulation interference is not mitigated, then all component carriers can operate at full power, but signal quality of affected component carriers deteriorates
Solution Approach 1:
The system uses the presence of intermodulation interference as a diagnostic signal to identify and terminate the offending LTE secondary component carriers. By measuring interference in secondary 5GNR bands and tracing it back to specific LTE carriers, the system converts the harmful interference into useful information that enables automatic carrier management, thereby protecting signal quality while allowing unaffected carriers to operate at full power
Data Source
AI summary
A wireless access point wirelessly serves User Equipment (UEs) with a wireless communication service using carrier aggregation and intermodulation interference mitigation. The wireless access point transfers user data to the UEs using carrier aggregation over a primary Long Term Evolution (LTE) band that transports LTE primary component carriers, secondary LTE bands that transport LTE secondary component carriers, and secondary Fifth Generation New Radio (5GNR) bands that transport 5GNR secondary component carriers. The wireless access point measures intermodulation interference in the secondary 5GNR bands. The wireless access point terminates at least some of the LTE secondary component carriers in the secondary LTE bands when the intermodulation interference in the secondary 5GNR bands exceeds an interference threshold.