Quorum Server Power Management in Ad Hoc Networks
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Solution Overview
Problem
Ad-hoc networks face challenges in power conservation due to frequent topology changes and limited power capacity of nodes, leading to increased power usage and packet loss, especially in dynamic environments where nodes move frequently and require continuous communication.
Innovation Solution
Implementing a quorum system and a gossip algorithm within the ad-hoc network to manage node states, using a power-saving algorithm that directs nodes into sleep mode when not involved in routing or data exchange, and utilizing a quorum server to manage active and power-saving modes based on route information messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nodes remain continuously active to maintain network connectivity and respond to topology changes, then network reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic node state management where nodes can transition between active and power-saving modes based on network conditions. The quorum system dynamically determines which nodes must remain active to maintain network reliability, allowing other nodes to enter power-saving modes. This dynamic adjustment resolves the contradiction by making power consumption flexible rather than fixed.
Solution Approach 2:
Different nodes in the ad-hoc network are treated differently based on their role and network conditions. The quorum system identifies critical nodes that must remain active for network reliability versus non-critical nodes that can save power. This local differentiation allows the network to maintain reliability where needed while saving power where possible.
2Loss of energy
If nodes enter power-saving mode to reduce power consumption, then energy efficiency is improved, but packet loss increases
Solution Approach 1:
The quorum system implements feedback mechanisms where nodes monitor network conditions and adjust their power states accordingly. When nodes detect network congestion, topology changes, or critical routing needs, they receive feedback to remain active or wake from power-saving mode. This feedback loop ensures packet delivery is maintained while maximizing power savings during normal conditions.
Solution Approach 2:
The system performs preliminary actions by pre-establishing quorum sets and routing information before power-saving mode is activated. Nodes prepare necessary routing data and maintain quorum membership information in advance, allowing them to quickly respond when needed without causing packet loss due to delayed activation.
3Loss of energy
If a quorum system is implemented to manage node states, then power saving effectiveness is improved, but device complexity increases
Solution Approach 1:
The quorum system segments nodes into different quorums based on their network roles and power states. This segmentation allows independent management of active and power-saving nodes, simplifying the overall control logic. Each quorum can be managed separately, reducing the complexity of tracking and controlling individual node states across the entire network.
Solution Approach 2:
The patent introduces quorum servers as intermediary components that mediate between nodes and the power management system. These servers handle the complexity of quorum maintenance, state transitions, and coordination, shielding individual nodes from the full complexity of the power-saving mechanism while enabling effective power management.
Data Source
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AI summary
An example apparatus, such as a quorum server of a quorum system, is caused to receive a route information message or duplication thereof from a node of an ad hoc network including a plurality of nodes, with the node having sent or received the route information message during implementation of a routing protocol to determine a route between the nodes, such as according to a gossip algorithm. The apparatus is caused to identify, based on the route information message, nodes intended to also receive the route information message or intended to be part of the determined route. And the apparatus is caused to prepare an instruction message for transmission to one or more of the nodes such that the identified one or more nodes enter or remain in an active mode, and nodes other than the identified one or more of the nodes enter or remain in a power-saving mode.