Improvement of TCP Performance in Ad Hoc Networks Using Cross Layer Approach

Transmission Control Protocol (TCP) is known to suffer from performance degradation in mobile wireless environments. This is because such environments are prone to packet losses due to high bit error rates and mobility induced disconnections. TCP interprets packet losses as an indication of congestion and inappropriately invokes congestion control mechanisms, leading to degraded performance.In this paper, we propose a new mechanism that improves TCP performance in a wireless ad hoc network where we use multi-metric joint identification for congestion detection based on end-to-end measurements. On the other hand, in this paper we utilizes network layer feedback for identification of disconnection state furthermore when packets are lost due to channel error, the TCP sender retransmits packets without invoking congestion control.