Small Cell Transmit Power Adjustment via Spatial RSSI
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Solution Overview
Problem
Managing transmit power in small-cell networks is challenging due to inter-cell interference and maintaining communication performance, especially in dense deployments where coverage holes and excessive interference can occur, making it difficult to determine optimal power settings for each small cell.
Innovation Solution
A radio node dynamically adjusts its transmit power based on spatial and temporal Received Signal Strength Indication (RSSI) metrics from neighboring nodes and attached devices, using a threshold-based approach to reduce or increase power, thereby improving communication performance and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve coverage, then coverage holes are reduced, but inter-cell interference increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment where small cells continuously monitor spatial RSSI metrics and automatically adjust their transmit power levels in real-time based on current network conditions, transitioning from static to dynamic power management to balance coverage and interference
Solution Approach 2:
The system uses spatial RSSI metrics collected from multiple neighboring radio nodes as feedback to control transmit power adjustments, creating a closed-loop control system that continuously optimizes power levels based on actual interference and coverage conditions
2Object-generated harmful factors
If transmit power is decreased to reduce interference, then inter-cell interference is reduced, but coverage holes increase
Solution Approach 1:
The patent changes the parameter being optimized from individual temporal RSSI measurements to spatial RSSI metrics that aggregate information from multiple neighboring nodes, enabling more accurate determination of optimal power levels that simultaneously address interference and coverage requirements
3Manufacturing precision
If centralized control is used to manage power settings, then power optimization is improved, but device complexity and control overhead increase
Solution Approach 1:
Each small cell radio node autonomously determines and adjusts its own transmit power by collecting spatial RSSI metrics from neighboring nodes and applying the adjustment algorithm locally, eliminating the need for centralized power management and reducing control overhead
Solution Approach 2:
The patent divides the centralized power management function into distributed autonomous decision-making at each radio node, with each node independently managing its own power based on local spatial measurements, thereby decentralizing control and reducing complexity
Data Source
AI summary
A radio node may transmit a signal using a transmit power. Then, the radio node may adjust the transmit power within a range of values. The adjustment may include reducing the transmit power when a spatial received signal strength indication (RSSI) metric of the radio node is greater than a first threshold value and a coverage criterion is met. Note that the spatial RSSI metric of the radio node may correspond to a set of temporal RSSI metrics of the radio node received from neighboring radio nodes. Moreover, the coverage criterion may be that less than a portion of RSSI measurements of the radio node associated with electronic devices, which are communicatively attached with the radio node, is less than a second threshold value. Alternatively, the adjustment may include increasing the transmit power when the spatial RSSI metric is less than the first threshold value.