An Improved Cross Layer Design For TCP Optimization With Flow Control and Acknowledgment Aggregation

This study offers a new cross-layer technique for improving Transmission Control Protocol (TCP)performance in wireless networks by removing the bottleneck of packet losses through flow control and Adaptive Modulation Coding (AMC). The TCP developed for hardwired networks is incompatible with the time-varying nature of wireless networks. TCP can detect con- gestion on an indirect route through missing acknowledgments. In these situations, congestion is not to blame for packet loss; instead, it is the congestion window problem. Thus, a cross-layer design technique combining AMC with flow control is required to improve TCP's performance over time-varying channels. Results show that the proposed cross-layer design can achieve better than TCP levels of optimization for latency, throughput, and Packet Error Rate (PER).