| This thesis studies the comparative performances of the transport protocols using the different routing strategies, to identify the bottleneck parameters in SCTP to be optimized for improved performance. The state of the path is modeled using transport layer parameters. To achieve this, an adaptive algorithm is designed, which observes the changes in the path condition. The preliminary evaluation of these protocols through analysis and simulations using ns-2 showed that the average delay for SCTP is high compared to TCP. The efficiency of packet delivery is excellent with regards to the parameters-packet delivery ratio, routing overhead and goodput. Once the path condition is determined to be degrading, we identify a backup path to be switched to. This switching of the primary path due to path quality degradation has resulted in the reduction of average delay. Consequently there is increased bandwidth utilization resulting in a significant increase in the goodput. The kinds of applications that benefit from increased bandwidth utilization are bandwidth-constrained multimedia transport over MANET. Another class of application benefiting from reduction in average delay is real-time applications. |
