Community trend message locking routing protocol for delay tolerant network

Delay Tolerant Network (DTN) establishes the communication framework in environments where source and destination cannot establish the end-to-end path due to the limited transmission range, frequent disconnections, and network partitioning. The messages are delivered to their destinations by adopting a store, carry and forward paradigm in which the node stores the arriving message in its buffer, carries it while moving, and forwards on connecting to other nodes. The DTN multi-copy protocols diffuse the several message copies on all connected nodes and deplete the network resources such as buffer space, bandwidth, and energy. This resource consumption is controlled by incorporating a social community message forwarding technique. The node employs the global rank forwarding metric while moving outside the community and shifts to the local rank forwarding metric while moving within the community. This method produces congestion in scenarios where the node continues message replications on higher global and local rank peers. As a result, more messages are dropped, and message delivery is reduced. This paper presented the Message Locking Routing Protocol for Delay Tolerant Network (CTML). The CTML controls the message forwarding process by employing the Local Rank Lock (LRL) and Global Rank Lock (GRL). The Local Rank Lock (LRL) controls the message transmission during node mobility within the community whereas Global Rank Lock (GRL) refrains the message forwarding during node mobility outside the community. Thus, the small number of transmissions reduces congestion. Similarly, CTML control message drop by using Message Drop Lock (MDL) where a node cannot drop a message with higher global rank or local rank values. Finally, the delivery ratio has been increased by using Deliver to Destine Lock (DDL) lock where a node with higher threshold values to meet the destination is enforced to forward the message directly to its destination. The simulation results prove that the proposed CTML has performed better in terms of reducing message transmissions , message drop, hop-count average, overhead, and raising delivery ratio.