Performance Evaluation of Buffer Management Techniques in Delay Tolerant Network

Abstract

Trying to enhance the network quality of service which becomes an important issue in networks world. Buffer management techniques one of the way to increase the performance of the network precisely in the Delay Tolerant Network ( DTN ). The main focus was on SHLI and LEPR Techniques to get the maximum potential of the network resources. The challenge is how to differentiate between the packets which delivered to nodes to define which packets have higher priority than others. Then a Differentiated Service Model (DiffServ) mechanism is proposed to solve this obstacle. This work will be done through simulation using MATLAB. A mathematical model was used to evaluate the performance of the network in term of QoS parameters such as ( Delay time, Bandwidth Utilization, Throughput and Data rate ). After implementing and run both algorithm over three type of services ( File transmission, Video and Voice) , results showed that percentage difference of delay time when apply both algorithm SHLI and LEPR for all services is 20%. For Throughput SHLI have higher value than LEPR about 18%.Regarding to Bandwidth Utilization, SHLI is most usage of resource than LEPR compared to LPER due to the increased packet size clustering. Then, data rate for SHLI is greater than the LPER by 23%. Also showed which techniques are better to implement for specific type of service or application to get high utilization of the resource which leading to high performance.