Inter-band Multi-carrier Power Control for Intermodulation Distortion
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Solution Overview
Problem
Current power control methods for inter-band multi-carrier capable devices, such as those using inter-band carrier aggregation, face challenges in managing intermodulation distortion, which leads to desensitization of downlink carriers due to overlapping intermodulation distortion components, and existing band-specific power restriction values like A-MPR are cumbersome and ineffective for ensuring low desensitization levels without compromising coverage.
Innovation Solution
Calculating and signaling output power restriction values for cumulative output power of combined uplink carriers operating on different bands to perform power control, ensuring that the cumulative output power does not exceed a specified threshold, thereby reducing intermodulation distortion and maintaining coverage flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If band-specific power restriction values (A-MPR) are used for inter-band multi-carrier combinations, then power control can be applied to individual bands, but the control becomes cumbersome and unreliable for all conceivable band combinations, and separate power control may lead to unnecessary or excessive reduction in coverage
Solution Approach 1:
The patent merges multiple band-specific power control parameters into a single cumulative output power restriction value that applies to the combination of uplink carriers. Instead of managing separate A-MPR values for each band combination, the system uses one unified power control mechanism that ensures intermodulation distortion remains below the threshold for the cumulative output power of all active uplink carriers, thereby simplifying the control architecture while maintaining reliability.
Solution Approach 2:
The cumulative output power restriction value serves as a universal power control mechanism that applies across all inter-band carrier aggregation scenarios. This single parameter replaces the need for multiple band-specific parameters, providing multi-functional coverage for various carrier combinations while ensuring consistent intermodulation distortion control without requiring separate power control configurations for each band pair.
2Object-affected harmful factors
If separate power control of individual bands/carriers is applied to avoid excessive desensitization, then intermodulation distortion can be reduced, but coverage of the respective uplink/downlink transmissions is unnecessarily or excessively reduced
Solution Approach 1:
The patent changes the power control parameter from individual band power levels to a cumulative output power parameter. By controlling the sum of power across all uplink carriers rather than limiting each carrier independently, the system achieves intermodulation distortion control while preserving the coverage area. The cumulative power restriction allows flexible power distribution among carriers as long as the total remains below the threshold, avoiding unnecessary coverage reduction.
3Ease of operation
If cumulative output power control is implemented with a single power restriction value for all uplink carriers, then power control flexibility and coverage are maintained, but the control mechanism becomes simpler and less cumbersome
Solution Approach 1:
The patent implements a feedback mechanism where the network calculates the cumulative output power based on the actual power levels of all active uplink carriers and compares it against the intermodulation distortion threshold. The power control mechanism adjusts the cumulative power restriction dynamically to ensure that intermodulation distortion remains below the threshold while maintaining ease of operation through a single unified control parameter rather than multiple independent parameters.
Data Source
AI summary
There are provided measures for enabling power control for inter-band multi-carrier capable devices, such as e.g. inter-band carrier aggregation capable devices. Such measures may exemplarily include calculating at least one output power restriction value for a cumulative output power for a combination of at least two uplink carriers of a terminal device, said two uplink carriers operating on different bands, signaling the calculated at least one output power restriction value to the terminal device, and performing power control for the at least two uplink carriers using the acquired at least one output power restriction value at the terminal device.