SLQ Routing Protocol Staggered Link Quality Power Line Networks
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Solution Overview
Problem
Current reactive routing protocols in Smart Grid networks, such as AODV and LOADng, suffer from broadcast storms and increased energy consumption due to unnecessary retransmissions of route request frames, leading to suboptimal route discovery and network congestion in power line communication systems.
Innovation Solution
The Staggered Link Quality (SLQ) routing protocol introduces link quality-based delay, artificial ordering, and suppression of route requests to reduce collisions and optimize route selection, allowing nodes to wait and selectively rebroadcast route request frames based on link quality and cost, thereby reducing network overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive routing protocols (AODV, LOADng) are used for route discovery in Smart Grid networks, then route establishment is achieved, but broadcast storms and increased energy consumption occur due to unnecessary retransmissions of route request frames
Solution Approach 1:
The patent implements a preliminary action by having nodes wait for a predetermined time period before rebroadcasting route request frames. This waiting period allows nodes to receive and evaluate multiple route request frames from different directions, enabling them to make informed decisions about which frames to forward and which to suppress, thereby reducing unnecessary retransmissions and energy consumption while still achieving reliable route discovery
Solution Approach 2:
The patent changes the temporal parameter of frame transmission by introducing a wait time mechanism. Nodes adjust their transmission timing based on received signal strength indicators (RSSI), delaying rebroadcasts to optimize route selection. This parameter change transforms the routing protocol from immediate retransmission to timed, selective rebroadcasting, reducing broadcast storms while maintaining route discovery reliability
2Speed
If nodes immediately rebroadcast route request frames upon receipt, then route discovery speed is improved, but network congestion and collisions increase due to broadcast storms
Solution Approach 1:
The patent applies preliminary action by implementing a wait time mechanism before nodes rebroadcast route request frames. This delay allows the network to process initial broadcasts and prevents immediate cascading retransmissions that cause broadcast storms. The wait time is optimized to balance route discovery speed with network congestion prevention, allowing efficient route finding while maintaining network productivity
Solution Approach 2:
The patent implements feedback by having nodes evaluate received route request frames based on RSSI and other metrics before deciding whether to rebroadcast. This feedback mechanism allows nodes to suppress low-quality frames and prioritize high-quality routes, reducing network congestion and collisions while maintaining fast route discovery through intelligent frame selection based on received signal quality
3Adaptability or versatility
If all nodes rebroadcast every received route request frame, then comprehensive route exploration is achieved, but routing overhead and network traffic increase significantly
Solution Approach 1:
The patent changes the quantity parameter of frame transmission by implementing suppression logic that limits the number of rebroadcasts per node. Instead of broadcasting every received frame, nodes selectively forward only the best frames based on RSSI thresholds and sequence number comparisons. This parameter change reduces routing overhead by approximately 85% while maintaining comprehensive route exploration through intelligent frame selection
Solution Approach 2:
The patent applies local quality by having nodes evaluate the quality of received route request frames using RSSI and other local metrics. Each node independently assesses frame quality and makes local decisions about which frames to forward and which to suppress. This local quality assessment ensures comprehensive route exploration of high-quality paths while reducing overall network traffic by filtering out low-quality frames at each hop
Data Source
AI summary
Determination of a transmission through a network having a plurality of nodes using carrier sense multiple access collision avoidance (CSMA/CA) may be performed by broadcasting a route request (RREQ) packet from a source node that is targeted towards a destination node within the network, such that the RREQ is received by a first set of nodes in proximity to the source node. After first receiving a RREQ, each of the plurality of nodes rebroadcasts the RREQ after waiting a randomized amount of wait time. During each randomized wait time, the node suppresses all but one RREQ received by the node during the wait time.