A simple approach to increase the message delivery ratio in this case is proposed and its effectiveness is verified.
Our results confirm that congestion control helps increase message delivery ratio, even in highly congested network scenarios.
Simulation results show that, comparing with existing schemes, our proposed NTC scheme has significant advantages in enhancing the message delivery ratio and reducing the transmission overhead.
Our results show that OS-Multicast and DTBR can achieve higher message delivery ratio than that of using U-Multicast and ST-Multicast strategies.
Through comparative simulations under different traffic scenarios, we validate our proposed method and prove that it can guarantee message reachability and achieve high delivery efficiency in terms of message delivery ratio, average routing latency and cost.
To ensure high message delivery ratio and low delivery delay, directional greedy broadcast routing (DGBR) is introduced to make a group of candidate nodes hold the message for high reliability.
Furthermore, as shown in simulation results, this method can offer a fair routing environment in DTNs, and it can increase the average message delivery ratio of the network when the greedy behavior occurs.
It was observed, for instance, that the message delivery ratio in a star network consisting of six wireless electrocardiogram sensor devices may decrease from 100% when no hidden-nodes are present to 83.96% when half of the sensor devices are unable to detect the transmissions made by the other half.
This algorithm uses labels to improve message delivery ratio.
message delivery ratio, message traffic ratio and average message delay.
Message delivery ratio in PSODTN is on average 98%.
