Self-Adaptive Downlink Power Control for Noise-Limited Cellular Networks
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Solution Overview
Problem
Conventional power control schemes in wireless cellular networks are ineffective in noise-dominated environments, as they rely on inter-cell interference coordination, which limits performance and flexibility, especially for cell-edge users, and do not efficiently utilize available transmit power.
Innovation Solution
A self-adaptive downlink power control scheme that assigns multi-level transmit power densities and power boosting to UEs based on channel quality, allowing for load balancing between power levels without requiring coordination between cells, enabling flexible frequency domain scheduling and full utilization of available power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inter-cell interference coordination schemes are used to reduce interference, then interference levels are reduced, but network performance in noise-dominated environments is limited and flexibility for cell-edge users is reduced
Solution Approach 1:
The patent changes the power assignment parameters dynamically based on channel conditions. Instead of using fixed power masks for interference coordination, the system adjusts power levels adaptively for different UEs depending on their channel quality, allowing cell-edge users to receive higher power when needed while maintaining overall system performance in noise-dominated environments
Solution Approach 2:
The patent introduces dynamic power control where power assignment values are adjusted in real-time based on reported channel conditions. This dynamic approach replaces static interference coordination schemes, enabling the system to respond to changing noise conditions and provide flexible power allocation to cell-edge users without being constrained by pre-defined power masks
2Device complexity
If fixed power assignment values are assigned to UEs, then power control is simplified, but throughput and coverage tradeoff cannot be optimized dynamically
Solution Approach 1:
The patent implements a feedback mechanism where UEs report their channel conditions to the base station, which then adjusts power assignment values accordingly. This feedback loop enables dynamic optimization of throughput and coverage without requiring complex manual configuration, as the system automatically adapts power levels based on real-time channel quality information
Solution Approach 2:
The patent pre-configures a set of discrete power assignment values that can be selectively applied based on channel conditions. This preliminary preparation of power levels allows the system to quickly switch between different power configurations without complex real-time calculations, maintaining simplicity while enabling dynamic optimization of throughput and coverage
3Area of stationary object
If power is boosted for cell-edge users, then coverage is improved, but available transmit power is consumed faster and load balancing is disrupted
Solution Approach 1:
The patent applies power boosting locally and selectively to specific UEs based on their individual channel conditions rather than uniformly boosting power for all cell-edge users. This localized approach ensures that power is consumed only when and where it is truly needed to overcome noise, maintaining coverage for users who need it while preserving transmit power for the overall system and enabling better load balancing across different power levels
Data Source
AI summary
The invention provides a self-adaptive downlink power control scheme for OFDMA-based wireless cellular networks suitable for noise-limited environments. Downlink power levels are assigned in a distributed manner in the absence of any requirement for coordination or cooperation between cells. Distributed assignment allows for more optimal usage of the available transmit power at the base stations and more complete exploitation of the flexibility of frequency domain scheduling. In one embodiment, base stations in a cellular network service mobile user equipment within the respective base station coverage areas, and categorize the user equipment in a plurality of power levels according to certain criteria in accordance with such factors as channel experience and quality. A load-balancing self-adjustment mechanism allows automatic balancing of the load between different power levels.