Parent Node Selection in Wireless Sensor Networks
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Solution Overview
Problem
IPv6 wireless sensor networks face high packet loss rates and network instability when applied to mobile scenarios due to the lack of effective rules for selecting a preferred parent node, leading to poor link quality and inaccurate comparisons using Rank values.
Innovation Solution
A method and apparatus for selecting a preferred parent node in a wireless sensor network that generates a parent node set based on DIO messages, prioritizing fixed nodes with the highest performance parameter level when available, and mobile nodes with the highest performance parameter level when no fixed nodes are present, using a combination of Rank values and RSSI values to ensure optimal node selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preferred parent node is selected according to Rank value and acyclic graph in mobile scenario, then network access is enabled, but packet loss increases and network stability deteriorates
Solution Approach 1:
The patent changes the selection criteria from using only Rank value to using a composite metric that includes both Rank value and RSSI (Received Signal Strength Indicator). This parameter change allows the system to account for both topological position and signal quality, thereby reducing packet loss and improving network stability in mobile scenarios
Solution Approach 2:
The patent replaces the traditional Rank-value-based selection mechanism with a new selection mechanism that incorporates RSSI measurements. This substitution introduces a physical layer metric (signal strength) to complement the network layer metric (Rank), creating a more robust parent node selection process that adapts to mobile node movements
2Measurement precision
If Rank value comparison is used for parent node selection, then selection process is simplified, but selection accuracy deteriorates
Solution Approach 1:
The patent merges two selection criteria (Rank value and RSSI) into a unified parent node selection process. By combining these metrics, the system achieves more accurate selection without introducing excessive complexity, as both parameters are already available in the RPL protocol framework
Solution Approach 2:
The patent makes the parent node selection process multi-functional by enabling it to simultaneously consider topological optimality (Rank) and link quality (RSSI). This universal approach allows the same selection mechanism to work effectively for both static and mobile nodes in various network conditions
3Adaptability or versatility
If mobile nodes are accommodated in the network, then network adaptability improves, but link quality deteriorates due to unfixed location
Solution Approach 1:
The patent introduces dynamics into the parent node selection process by incorporating RSSI, a time-varying parameter that reflects current link quality. This allows the selection mechanism to adapt to the changing positions of mobile nodes, maintaining link quality despite location changes
Solution Approach 2:
The patent implements feedback by using RSSI measurements to inform parent node selection decisions. The received signal strength provides real-time feedback about link quality, enabling nodes to select parents that currently offer the best connection, thereby maintaining reliability in mobile scenarios
Data Source
AI summary
Embodiments of the disclosure provide a method and an apparatus for selecting a preferred parent node in a wireless sensor network, and the method includes: according to all received DIO messages, separately acquiring, by a first node, node identification information carried in each of the DIO messages and generates a parent node set; selecting, by the first node, a fixed node with a highest performance parameter level as a preferred parent node when it is determined that the parent node set includes at least two fixed nodes; and selecting, by the first node, a mobile node with a highest performance parameter level as the preferred parent node when it is determined that the parent node set does not include a fixed node, and includes at least two mobile nodes.