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Contention among multiple nearby WLANs in urban areas may cause severe TCP unfairness, where some TCP flows can achieve very high throughput at the expense of starving others. This unfairness results from the fact that different physical nodes conveying TCP flows at a wireless bottleneck may have different channel observations and consequently they may provide inconsistent feedbacks to the TCP sources...
Wireless LANs have been widely deployed as edge access networks in home/office/commercial buildings, providing connection to the Internet. Therefore, performance of end-to-end connections to/from such WLANs is of great importance to network applications and end-users. The advent of Dynamic Spectrum Access (DSA) technology is expected to play a major role in improving wireless communication. With DSA...
In wireless LAN connected with Internet, the anomaly of wireless channel and the greedy nature of closed loop control in TCP lead to the congestion problem and significant unfair bandwidth distribution between TCP flows. In this paper, an ECN-based access point congestion control algorithm called APCC (AP congestion control) is proposed. The main properties of APCC are: (1) Using both wireless channel...
The UDP transport protocol has been fore selected for the most of multimedia traffic transport on mobile wireless networks. Nevertheless, it exhibits some problems related to bandwidth sharing between several traffic sources, as well as TCP friendliness with established TCP connections on the network. In this paper, we propose a combined mechanism, the PRDR: proportional and derivative algorithm for...
Achievement of the QoS guarantee has come to be expected even in the wireless LAN communications. Because it is difficult to realize remodeling the MAC method of layer 2, we focus on the realization of per-flow QoS (throughput) using TCP control in layer 4. In the concrete, TCP-AV which has bandwidth reservation mechanism is used. A lot of paper has already been published about fairness of throughput...
In this research, we first investigate the cross-layer interaction between TCP and routing protocols in the IEEE 802.11 ad hoc network. On-demand ad hoc routing protocols respond to network events such as channel noise, mobility, and congestion in the same manner, which, in association with TCP, deteriorates the quality of an existing end-to-end connection. The poor end-to-end connectivity deteriorates...
This paper focuses on TCP fairness over WLAN and proposes a new active queue management (TFBR) to solve the TCP unfairness between TCP upstream flows and downstream flows. The proposed TFBR modifies the drop tail, and controls the sender rate by setting the advertised receiver window of the packets in queue of the access point (AP) before executing drop tail program. The key point of the scheme is...
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