ABSTRACT

The TCP window size value, which is contained in the window size field of the TCP segment is a very important TCP Parameter. The window size value determines the number of bytes of data that can be sent before an acknowledgement from the reciever is necessary. If the window size field value is made too small, the performance deteriorates. This will slow throughput considerably. On the other hand, if the window size field is made too large, the sender may transmit so many segments that reciever will be overloaded. The window size field provides flow control, regulating the rate at which the transport processes on the two hosts may transmit. In this paper we have proposed modifications in TCP WindowSize, wherein the performance in the network is improved by changing the TCP parameters. Simulations done on Opnet Simulator shows significant improvement in throughput, reduction in upload response time and delay.