A Control Method of Guaranteeing Throughput for TCP Communication Considering Handover over WLAN

Abstract

In wireless LAN environments, the frequency of handover has been increased by the rapid spread of mobile devices such as smartphones and tablets. In such environments, streaming applications such as video feeds, are quite common and have high bandwidth (throughput) requirements. Here, QoS is an important metric for assurance of network quality. QoS-TCP has been proposed as one of the techniques for guaranteeing the throughput; it controls only the terminal. In this study, we treat TCP-AV as one of the typical QoS-TCPs. However, TCP-AV was originally developed for wired networks. It has difficulty in guaranteeing adequate throughput in a wireless LAN environment because it does not consider handover. Given the frequency of handover in wireless LAN environments, (1) we modify the parameters of TCP-AV, and (2) we propose advertise window size control by an access point (AP). Simulation results show that the method proposed herein, which uses both (1) and (2), can attain the necessary throughput, unlike the original TCP-AV approach.

TCP-TFEC: TCP Congestion Control based on Redundancy Setting Method for FEC over Wireless LAN

“…Second, in order to improve the performance of TCP streaming services, the several TCP congestion controls [11], [12], [14], [18]- [20] have been proposed. To begin with, TCP-Hollywood [18] has been developed for applications with tight latency bounds.…”

“…However, when the round trip time changes drastically (this situation sometimes occur in the wireless LAN), these methods cannot guarantee the target throughput. Thus, in order to overcome the problem, TCP-AV for wireless LAN [19], [20] has been proposed. TCP-AV for wireless LAN uses the smoothed round trip time and tuned control parameters to secure the target throughput on the wireless LAN.…”