چكيده فارسي :
The user demand for high speed and ubiquitous connectivity has led to the development and deployment of many new technologies, Given that these networks are increasingly being deployed as high-speed access networks, it is highly desirable to achieve good network performance over such networks. These networks show different characteristics (asymmetry) in uplink and downlink directions. Network asymmetry (uneven bandwidth) can negatively affect the performance of feedbackbased transport protocol such as Transmission Control Protocol (TCP). ACK Filtering and ACK Congestion Control techniques are used to diminish the congestion on the upstream link. These techniques suffer from sender burstiness and a slowdown in congestion window growth problems. This paper addresses the TCP performance problems caused by network asymmetry and evaluate the performance of combination ACK Filtering and ACK Congestion Control with Pure TCP/NewReno using the Network Simulation 2 (NS2), based on actual queue length, packet loss, packet arrival rate, congestion window size, and throughput. Even these tows techniques are reduced the number of the ACKs, the TCP/NewReno still have good performance as a result of this evaluation. The results showed that TCP NewReno has faster, smoother, and less queue length fluctuation, higher packet arrival rate, less packet drop, but with fluctuated throughput that does not reach the optimal level
كليدواژه :
ACK Filtering , ACK Cngetion Control , TCP , NewReno , Asymmetry Network
