Communication Node Retransmission Delay for Network Congestion
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Solution Overview
Problem
Dense wireless communication networks, such as those in lighting systems, experience significant interference due to retransmission requirements, leading to network congestion and reduced efficiency, as each communication node in close proximity retransmits messages, causing broadcast storms.
Innovation Solution
A method where communication apparatuses introduce a random retransmission delay based on their status and message properties, allowing them to monitor retransmissions during this delay and decide whether to participate, thereby reducing interference and maintaining network efficiency by prioritizing other nodes with more suitable conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message broadcast and retransmission mechanisms are used in dense communication networks, then message delivery reliability is improved, but network interference and congestion increase significantly
Solution Approach 1:
The patent implements dynamic retransmission delay adjustment where communication nodes adapt their retransmission timing based on real-time network conditions. Nodes monitor channel status and dynamically select delay values from adjustable intervals, transforming the static retransmission mechanism into a dynamic one that responds to network density and interference levels, thereby reducing broadcast storms while maintaining delivery reliability
Solution Approach 2:
The patent changes key parameters of the retransmission mechanism including delay intervals, maximum retransmission counts, and monitoring thresholds. By adjusting these parameters based on network conditions (e.g., extending delay intervals in dense networks), the system optimizes the balance between reliable message delivery and interference reduction, directly addressing the contradiction between reliability and harmful interference
2Area of stationary object
If all communication nodes retransmit messages in dense networks, then message propagation coverage is improved, but channel occupation and network load increase
Solution Approach 1:
The patent implements partial retransmission where not all communication nodes participate in retransmitting the same message. Nodes use random backoff delays and monitoring mechanisms to determine whether to retransmit, ensuring that enough nodes participate to maintain coverage while avoiding excessive channel occupation. This partial action principle directly reduces the quantity of retransmissions while preserving adequate propagation coverage
Solution Approach 2:
The patent requires communication nodes to monitor the channel during their scheduled retransmission delay period before actually transmitting. This preliminary monitoring action allows nodes to detect if other nodes have already retransmitted the message, enabling them to cancel their own retransmission if unnecessary. This preliminary check prevents excessive channel occupation while ensuring message propagation continues through at least some nodes
3Speed
If retransmission delay interval is reduced to maintain network efficiency, then response time is improved, but interference from simultaneous retransmissions increases
Solution Approach 1:
The patent makes the retransmission delay interval dynamic rather than fixed. Nodes adjust their delay intervals based on monitored network conditions, selecting from multiple adjustable intervals. This dynamic adjustment allows the system to reduce delays (improving response time) when network conditions permit, while increasing delays (reducing simultaneous interference) when conditions deteriorate, thus resolving the contradiction between speed and interference
Solution Approach 2:
The patent implements feedback mechanisms where communication nodes monitor channel conditions and adjust their retransmission behavior accordingly. Nodes use feedback from channel monitoring to determine whether to apply shorter or longer delays, creating a closed-loop control system that balances response time and interference levels based on real-time network state
4Quantity of substance
If communication nodes monitor retransmissions during delay period to reduce interference, then network load is reduced, but processing overhead and complexity increase
Solution Approach 1:
The patent implements self-service monitoring where each communication node autonomously monitors the channel during its retransmission delay period and makes independent decisions about whether to retransmit. Nodes use their own resources to perform monitoring and decision-making without requiring centralized coordination or complex inter-node communication, reducing overall network load while keeping individual node complexity manageable through standardized monitoring procedures
Data Source
AI summary
The present invention relates to a method for operating a communication apparatus in a network comprising a plurality of communication nodes, upon reception of a message at the communication apparatus, the communication apparatus starting a retransmission delay being selected at random from a retransmission delay interval, said retransmission delay interval being dependent on at least one of a status of the communication apparatus and a property of the received message, the communication apparatus monitors retransmissions of said message by other communication nodes during said retransmission delay and the communication apparatus transmitting a retransmission of said message at the expiry of said retransmission delay if a statistic based on the retransmissions of said message by other communication nodes is below a threshold.