Uplink Carrier Aggregation Power Offsets for Equalized Power Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power control mechanisms in wireless communications networks, particularly in LTE and LTE Advanced, fail to efficiently allocate transmit power when carrier aggregation is used, especially with higher order modulation schemes like 256QAM, leading to suboptimal use of uplink resources and non-optimal throughput due to power scaling and differing signal-to-interference-plus-noise ratios.
Innovation Solution
Implementing a dynamically adjustable power density offset at the base station to evenly distribute transmit power across component carriers, taking into account estimated PRB usage and radio conditions, allowing for closed-loop power control to achieve equal received signal power density, thereby optimizing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional power control mechanisms are used in carrier aggregation, then power allocation is simplified, but uplink throughput is suboptimal due to power scaling and non-equal distribution across component carriers
Solution Approach 1:
The patent implements dynamic power density offsets that are adjusted based on radio conditions and PRB usage estimates. The network node continuously updates the power density offset for each component carrier to achieve equal received signal power density, transforming the static power control mechanism into a dynamic one that adapts to changing channel conditions and traffic patterns.
Solution Approach 2:
The patent changes the power density parameter dynamically by introducing adjustable power density offsets for each component carrier. These offsets are modified based on estimated PRB usage and radio conditions, allowing the system to optimize power distribution across carriers according to actual network state rather than using fixed power allocation.
2Productivity
If power is allocated to achieve equal received signal power density across component carriers, then throughput is optimized, but power control calculation complexity increases
Solution Approach 1:
The network node performs self-service by autonomously calculating and adjusting power density offsets based on its own measurements of radio conditions and estimates of PRB usage. The system uses its internal capabilities to monitor channel quality and traffic patterns, then automatically updates power control parameters without requiring complex external coordination or additional signaling overhead.
Solution Approach 2:
The patent implements a feedback mechanism where the network node continuously monitors received signal power density, PRB usage, and radio conditions on each component carrier. Based on this feedback, the system adjusts the power density offsets to maintain equal received signal power density across carriers, creating a closed-loop control system that adapts to changing conditions.
3Productivity
If higher order modulation schemes like 256QAM are used, then data rate increases, but power scaling issues worsen due to differing signal-to-interference-plus-noise ratios across carriers
Solution Approach 1:
The patent applies local quality by setting component carrier-specific power density offsets that are tailored to the specific radio conditions and PRB usage of each carrier. Instead of using a uniform power allocation approach, the system adjusts power density locally on each carrier to account for differences in channel quality, interference levels, and traffic patterns, enabling reliable higher order modulation even when carriers have different SINR characteristics.
Data Source
AI summary
A network node allocates (810), to each of two or more component carriers, a respective power share of a total UE transmit power and calculates (820) a required UE transmit power to achieve a target power density at the network node, where the target power density is the sum of a nominal target power density and a predetermined power density offset. The network node reallocates (830) 5 any excess available UE transmit power over the required UE transmit power for a carrier to another carrier or carriers and calculates (840) an achievable received power density at the network node based on the allocated UE transmit powers. The network node calculates (850) an adjusted power density offset by subtracting the nominal target power density from the achievable received power density, and uses the adjusted power density offset when performing (860) closed-loop power 0 control for the carriers.