LTE Base Station Power Allocation via RSRQ and Fairness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, existing power allocation methods fail to adapt quickly to varying channel qualities and do not consider fairness, leading to inefficient power usage and decreased system performance, particularly when user equipment is in motion, and can starve UEs with unfavorable channel conditions.
Innovation Solution
A method and base station implementation that dynamically allocates power in downlink transmissions by considering both channel quality and fairness, using a combined factor based on Reference Signal Received Quality (RSRQ) and a fairness factor to determine optimal power allocation for resource blocks, employing a water filling function to balance power distribution across subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If equal power is allocated to all subcarriers, then power allocation is simple, but power usage efficiency decreases when channel quality varies
Solution Approach 1:
The patent applies local quality by allocating different power levels to different subcarriers based on their individual channel qualities. The base station determines channel quality for each subcarrier and assigns higher power to subcarriers with better channel conditions, thereby optimizing power usage efficiency while adapting to varying channel characteristics across the frequency spectrum.
Solution Approach 2:
The patent implements dynamics by making power allocation adaptive to changing channel conditions. The base station continuously monitors channel quality and dynamically adjusts power distribution across subcarriers in real-time, allowing the system to respond to rapid channel variations and maintain optimal power usage efficiency under different operating conditions.
2Productivity
If power allocation follows only channel quality, then system throughput increases, but fairness deteriorates and UEs with unfavorable conditions are starved
Solution Approach 1:
The patent merges two previously separate functions into a unified power allocation mechanism. It combines channel quality-based power optimization with fairness-based resource scheduling into a single integrated algorithm, allowing the system to simultaneously achieve high throughput for users with good channel conditions while guaranteeing minimum resource allocation for users with poor conditions, thus maintaining both productivity and reliability.
3Use of energy by moving object
If power allocation adapts to rapid channel changes, then power usage efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements feedback by establishing a closed-loop system where the base station receives channel quality information from user equipment, processes this information to determine optimal power allocation, and applies the resulting power distribution. This feedback mechanism enables the system to adapt to rapid channel changes and maintain high power usage efficiency while managing complexity through structured information flow and systematic processing.
Data Source
AI summary
A base station in a LTE system and a method for use in the base station (400) are provided for allocating power in downlink transmissions for a UE. A report is received, from the UE, comprising a Reference Signal Received Quality, RSRQ, indicating a current channel quality of a downlink transmission with multiple subcarriers. A fairness factor used for achieving fairness in scheduling between UEs served by the base station is retrieved, from a resource management scheduler of the base station; and a combined factor is determined based on the received RSRQ and the retrieved fairness factor, for resource blocks, RBs, related to the downlink transmissions, the RBs comprising subcarriers pertaining to resources to be allocated to the UE. Then, a power is determined for the resource RBs based on the determined combined factor; and the determined power for the downlink transmission for the UE is allocated.