Priority Queue Based Reactive Buffer Management Policy for Delay Tolerant Network under City Based Environments.

Area of Science:

• Computer Science
• Network Engineering
• Telecommunications

Background:

• Delay Tolerant Networks (DTN) often employ multi-copy routing, leading to network congestion and message drops.
• Current reactive drop policies use a single metric, making message dropping decisions suboptimal as resource consumption varies.
• The Time To Live (TTL) parameter in DTNs has limitations in managing message lifecycles effectively, especially for delivered messages.

Purpose of the Study:

• To propose a novel Priority Queue Based Reactive Buffer Management Policy (PQB-R) for DTN environments.
• To address inefficiencies in existing reactive drop mechanisms and TTL limitations.
• To enhance message delivery performance in urban DTN scenarios.

Main Methods:

• Developed PQB-R, a policy that classifies buffered messages into distinct source, relay, and destination queues.
• Implemented separate drop metrics tailored for each message queue type.
• Conducted experiments in city-based environments to evaluate the policy's effectiveness.

Main Results:

• PQB-R significantly reduced the number of message transmissions.
• The proposed policy led to a decrease in overall message drop rates.
• An improvement in the message delivery ratio was observed with the implementation of PQB-R.

Conclusions:

• PQB-R offers a more efficient buffer management strategy for DTNs compared to existing reactive policies.
• The queue-based approach with differentiated drop metrics optimizes resource utilization and message handling.
• The policy demonstrates improved performance metrics, making it suitable for urban DTN deployments.