Multi-Carrier Power Scaling for Wireless Terminals
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Solution Overview
Problem
Radio transmitters in multi-carrier wireless communication systems face limitations in total transmit power, leading to reduced radio coverage, especially when WTRUs reach their maximum power and cannot maintain signal quality at the base station, particularly at cell edges or in regions of deep signal fade.
Innovation Solution
Implementing power scaling methods across multiple uplink carriers in wireless transmit/receive units (WTRUs) to manage and distribute power effectively among carriers, ensuring that the total transmit power does not exceed the maximum allowed value, while maintaining the required power ratios between control and data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a WTRU increases its transmission power to maintain signal quality at the base station, then signal quality is improved, but total transmit power limitation is exceeded
Solution Approach 1:
The patent segments the total transmit power across multiple uplink carriers, allowing the WTRU to distribute power resources effectively. Instead of concentrating all power on a single carrier, the system divides power allocation among multiple carriers (e.g., anchor carrier and supplementary carriers), enabling the WTRU to maintain signal quality on at least one carrier while staying within total power limits.
Solution Approach 2:
The patent applies local quality by ensuring that critical channels (such as control channels on the anchor carrier) receive sufficient power to maintain acceptable signal quality, while less critical data channels may receive reduced power. This selective power allocation ensures that essential communication functions remain reliable even when total power is constrained.
2Productivity
If multiple carriers are used to increase bandwidth and capacity, then system capacity is improved, but power distribution complexity increases
Solution Approach 1:
The patent implements dynamic power distribution mechanisms where the WTRU and base station continuously adjust power allocation across multiple carriers based on channel conditions, traffic requirements, and power availability. This dynamic adjustment allows the system to adapt to changing conditions while maintaining optimal power utilization across multiple carriers, managing complexity through automated control algorithms.
Solution Approach 2:
The patent employs feedback mechanisms where the base station monitors signal quality and power usage across multiple carriers, then provides power control commands to the WTRU. This closed-loop feedback system enables automatic power distribution optimization, reducing the complexity of manual power management while maximizing system capacity across multiple carriers.
3Power
If power scaling is applied when maximum power is reached, then power limitation is respected, but radio coverage is reduced
Solution Approach 1:
The patent transitions from single-carrier to multi-carrier transmission, adding a dimensional aspect to power allocation. By distributing power across multiple frequency carriers rather than concentrating it on one, the system maintains total power within limits while extending effective coverage through spatial and spectral diversity. The WTRU can communicate reliably across multiple carriers even when individual carrier power is reduced due to scaling.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may utilize pre-configured rules for scaling power levels. Channels may be grouped based on a type of data to be transmitted. A power level of a channel from a group may be scaled using the pre-configured rules. A power level of a channel of a supplementary carrier may be scaled before another channel of a non-supplementary carrier.