Mobile Station Power Control via Path Loss Estimation
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Solution Overview
Problem
Current uplink power control schemes in communication systems are inefficient in non-contiguous band communication, particularly with spectrum aggregation, as they require monitoring path loss in all frequency bands, leading to increased power and processing burdens on user equipment, reducing battery lifetime.
Innovation Solution
A method where a mobile device measures path loss in a primary frequency band and receives path loss estimate information from a base station for other frequency bands, allowing it to determine transmission power based on these measurements and estimates, reducing the need for explicit monitoring of all frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile device monitors path loss in all frequency bands, then the transmission power control accuracy is improved, but the power consumption and processing burden increase
Solution Approach 1:
The patent extracts the path loss monitoring function from all frequency bands and concentrates it only in the anchor frequency band. The base station provides path loss difference information for other bands, allowing the mobile device to calculate path loss in non-anchor bands without directly monitoring them, thus reducing power consumption while maintaining accuracy.
Solution Approach 2:
The base station acts as an intermediary by providing path loss difference information between the anchor band and other frequency bands. This intermediary information allows the mobile device to infer path loss in non-monitored bands without direct measurement, resolving the contradiction between monitoring accuracy and power consumption.
2Measurement precision
If the mobile device monitors path loss in all frequency bands, then the transmission power control accuracy is improved, but the processing burden increases
Solution Approach 1:
The patent extracts the complex path loss monitoring operation from all frequency bands and limits it to only the anchor frequency band. The base station provides pre-calculated path loss difference information, significantly reducing the processing burden on the mobile device while maintaining the ability to control transmission power accurately across all bands.
Solution Approach 2:
The base station performs preliminary calculations of path loss differences between frequency bands and provides this information to the mobile device in advance. This preliminary action eliminates the need for the mobile device to perform complex real-time path loss calculations for all bands, reducing processing burden.
3Productivity
If spectrum aggregation is implemented in non-contiguous bands, then the spectral efficiency is improved, but the path loss variation across bands increases
Solution Approach 1:
The patent applies local quality by treating the anchor frequency band differently from other bands. The anchor band serves as a reference with direct path loss monitoring, while other bands use the provided path loss difference information. This localized approach handles the frequency-dependent path loss variation in non-contiguous spectrum aggregation effectively.
Solution Approach 2:
The patent changes the parameter representation by introducing path loss difference information relative to an anchor band. Instead of requiring absolute path loss measurements in all bands, the system uses relative differences, allowing accurate power control across non-contiguous bands with varying path loss characteristics.
Data Source
AI summary
A method, including making one or more measurements at a mobile device of path loss for a transmission between said mobile device and a base station in a first frequency band of a plurality of frequency bands in which the mobile device is configured to make transmissions to said base station; receiving at said mobile device path loss estimate information specifying an estimate of the relationship between said path loss for a transmission between said mobile device and said base station in said first frequency band, and path loss for a transmission between said mobile device and said base station in a second frequency band of said plurality of frequency bands; and determining a transmission power for at least one transmission to said base station in said second frequency band on the basis of at least said one or more measurements and said path loss estimate information.