Neighbor Discovery in Wireless Sensor Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless sensor networks face challenges in supporting node mobility without significantly increasing power consumption, especially when nodes need to frequently scan for new connections due to movement, leading to increased energy consumption.
Innovation Solution
Incorporating information about second-hop neighbor nodes in beacon transmissions and utilizing previously received information to create new connections, allowing moving nodes to avoid full network scans and reduce power consumption by synchronizing with nearby nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nodes perform frequent network scans to discover new connections due to mobility, then network connectivity is maintained, but power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by having stationary nodes pre-calculate and store routing information for mobile nodes before the mobile nodes actually move. When a mobile node moves out of range, the stationary nodes already have the necessary routing data to quickly establish new connections without requiring the mobile node to perform energy-consuming network scans. This is achieved through the stationary nodes monitoring their environment and proactively preparing routing tables that include alternative paths and neighbor information.
Solution Approach 2:
The patent uses stationary nodes as intermediaries to facilitate connection establishment for mobile nodes. Instead of mobile nodes directly scanning for new connections, the stationary nodes act as mediators that provide routing information and help establish connections to new neighbors. This intermediary approach allows mobile nodes to remain in low-power mode while stationary nodes handle the complex task of network discovery and routing updates.
2Adaptability or versatility
If nodes remain in active state to quickly discover new connections, then mobility support is improved, but energy consumption increases
Solution Approach 1:
The patent applies segmentation by dividing the network into stationary nodes and mobile nodes with different functional roles. Stationary nodes handle the energy-intensive tasks of network scanning, neighbor discovery, and routing table maintenance, while mobile nodes focus on data transmission and remain in low-power states. This functional segmentation allows the network to support mobility without requiring mobile nodes to consume excessive energy for network maintenance.
Solution Approach 2:
The patent implements self-service through stationary nodes that automatically monitor their environment, detect new neighbors, calculate routing paths, and update their routing tables without external intervention. This self-service capability allows the network to adapt to mobile node movements autonomously, maintaining connectivity while keeping mobile nodes in energy-saving modes. The stationary nodes effectively serve themselves by proactively managing network topology changes.
Data Source
Figure 1~2b
Figure 3~4
Figure 5~6
AI summary
A node device (601) of a wireless sensor network comprises a receiver (651) for receiving transmissions from other nodes. A controller (641) selectively switches on said receiver (651) according to a timetable. The node device (601) maintains synchronization with and receives beacon transmissions from another node in said wireless sensor network. If a failure is observed in previously maintained synchronization, the controller (641) reads from memory previously received information about neighboring nodes with which said node device (601) did not yet maintain synchronization. The controller (641) utilizes such stored information to selectively switch on the receiver (651) to attempt receiving a beacon transmission from such a neighboring node.