Base Station Transmit Power Estimation for UE
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Solution Overview
Problem
In cloud radio access networks, user equipment (UE) often transmit at higher power than necessary, leading to excess battery consumption and increased rise-over-thermal ratios at radio points, due to inefficiencies in power control mechanisms during intra-cell and inter-cell reuse scenarios.
Innovation Solution
A base station system that estimates and adjusts the transmit power of UE by determining received power and path loss, and uses signal-to-interference-plus-noise ratio (SINR) reports to instruct UEs to adjust their power levels, ensuring optimal power usage and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra-cell reuse is used with multiple UEs transmitting simultaneously on the same resource elements, then system capacity and spectral efficiency are improved, but UE battery consumption increases and rise-over-thermal ratio at radio points increases
Solution Approach 1:
The base station estimates the transmit power of each UE by measuring received power and calculating path loss, then provides feedback to the UE to adjust its transmit power. This closed-loop feedback mechanism enables the UE to transmit at the minimum necessary power while maintaining communication quality, thereby reducing battery consumption during intra-cell reuse scenarios
Solution Approach 2:
The system dynamically adjusts the transmit power parameter of UEs based on real-time channel conditions and interference levels. By changing the power parameter adaptively rather than using fixed high power settings, the system maintains productivity while reducing energy consumption
2Productivity
If intra-cell reuse is used with multiple UEs transmitting simultaneously on the same resource elements, then system capacity and spectral efficiency are improved, but rise-over-thermal ratio at radio points increases
Solution Approach 1:
The base station monitors the rise-over-thermal ratio at radio points and uses this information in the power control feedback loop. When the RoT ratio exceeds thresholds, the base station instructs UEs to reduce transmit power, thereby controlling interference while maintaining system capacity through coordinated resource allocation
Solution Approach 2:
The system dynamically adjusts transmit power levels based on real-time interference conditions rather than using static power settings. This dynamic adaptation allows the system to maintain high capacity during low-interference periods while reducing power during high-interference periods, resolving the contradiction between productivity and harmful interference
3Reliability
If UE transmits at higher power than necessary, then signal quality and SINR are improved, but battery consumption increases
Solution Approach 1:
The base station provides continuous feedback to the UE about the adequacy of its transmit power based on measured signal quality and channel conditions. This feedback enables the UE to maintain reliable signal quality while avoiding excessive power transmission, optimizing the trade-off between reliability and energy consumption
Solution Approach 2:
Instead of requiring the UE to transmit at maximum or excessive power to ensure signal quality, the system uses partial action by adjusting power to the minimum necessary level. This approach achieves adequate signal quality without the excessive energy consumption that would result from always transmitting at high power
Data Source
AI summary
One embodiment is directed to a method of estimating a transmit power of a UE. The method comprises determining, at a base station serving the UE, a received power for the UE, determining, at the base station, a path loss for the UE, and determining, at the base station, the transmit power for the UE as a function of the received power for the UE and the path loss for the UE. The method can be used when the first UE has reached or exceeded a maximum reported power headroom (PHR) for the UE and can be used for performing transmit power control for the UE as a function of the determined transmit power for the UE. Other embodiments are disclosed. The described embodiments can be used in a cloud radio access network (C-RAN) as well as other types of base stations.