The current TCP or its variants are challenged with a number performance related issues when deployed in high Bandwidth-Delay Products, BDP, Networks such as the grid. Prominent among these challenging performance issues is poor network resource allocation which leads to under-utilisation of the grid. This thesis focuses on the development of a novel transmission control protocol which allocates network resource optimally whenever the Bandwidth-Delay Products are high typical in the grid. The thesis presents an congestion avoidance approach which is based on a link's available bandwidth. To...