Dynamic Power Grant Adjustment for HSUPA RoT Stability
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Solution Overview
Problem
In wireless communication networks, especially those using HSUPA, maintaining Rise-over-Thermal (RoT) stability and maximizing throughput is challenging due to interference from uncontrolled User Equipments (UEs) not managed by the current cell or network, such as UMTS R99/Rel 5 systems and other interfering entities.
Innovation Solution
The solution involves estimating RoT values at nodes within the network to dynamically adjust power grants for UEs, using methods like time division multiplexing and collaborative node operations to manage interference from uncontrolled entities, thereby maintaining RoT stability and optimizing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HSUPA scheduler increases power grants to maximize throughput, then network throughput is improved, but Rise-over-Thermal (RoT) stability deteriorates due to uncontrolled interference from non-HSUPA UEs and other cells
Solution Approach 1:
The patent implements a feedback mechanism where the scheduler continuously monitors RoT measurements and adjusts power grants dynamically. When RoT exceeds a threshold, the system reduces grants to controlled UEs to bring RoT back within acceptable ranges, creating a closed-loop control system that balances throughput and stability
Solution Approach 2:
The system changes the parameter of power grants dynamically based on RoT conditions. By adjusting grant sizes in response to measured RoT levels, the scheduler adapts to changing interference conditions while maintaining both throughput efficiency and RoT stability
2Reliability
If the scheduler reduces power grants to maintain RoT stability, then RoT stability is improved, but network throughput deteriorates
Solution Approach 1:
The scheduler applies partial reduction in power grants only to the extent necessary to maintain RoT stability, rather than uniformly reducing all grants. This selective approach maintains RoT control while preserving maximum possible throughput from controlled UEs
3Ease of operation
If the scheduler controls only HSUPA UEs, then ease of operation is improved, but RoT stability deteriorates due to uncontrolled interfering entities
Solution Approach 1:
The patent introduces RoT measurements as an intermediary metric that reflects the combined impact of all UEs (controlled and uncontrolled). By using RoT as the control variable, the scheduler can indirectly account for interference from uncontrolled entities without needing to directly control them
Data Source
AI summary
Methods, devices, and computer program products facilitate resource allocation to entities within a wireless communication network. Interference values are determined in the presence of entities that may or may not be controlled by the wireless communication network. Based on the determined interference values and associated statistics, throughputs associated with the user equipment within the wireless communication network are modified. These modifications enable an increase or decrease in the throughput of the user equipment, which optimizes the aggregate throughput of the wireless communication network while maintaining the interference levels within target levels.