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TCP fairness is an important issue in WLAN because the wireless channel is shared by all wireless nodes. Due to TCP-unfriendly nature of ACK packet, the network service is biased toward the uplink TCP flow and the downlink TCP flow tends to starve. In this paper, a buffer allocation algorithm on the downlink buffer of the Access Point (AP) is proposed to improve the fairness among uplink and downlink...
TFRC over wireless access networks has poor performance because it accounts wireless losses as congestion losses. To solve the problem, an enhanced TFRC protocol based on step ECN marking is proposed. The simulations show that, with appropriate loss differentiation and congestion notification, the new protocol achieves much higher throughput than TFRC as well as keeps reasonable friendliness to TCP...
Traditional TCP variants use packet loss as the indicator of congestion and reduce the congestion windows size, which results in degradation of TCP throughput. Subsequently, ECN is widely used to send the congestion feedback to end hosts by couple with AQM on routers. Based on the TCP fluid model under ECN mechanism, an enhancement over wired/wireless hybrid networks, WECN, is analyzed. The contribution...
Significant TCP unfairness in wireless local networks has been reported during the past several years. This unfairness results from the greedy TCP protocol and shared wireless medium. To solve the unfairness problem between uplink TCP flows, we proposed a scheduling algorithm called uplink weighted fair queueing (UWFQ). By adjusting the service weight of ACK packets, UWFQ achieves the channel adaptive...
Different from wired networks, TCP over wireless networks needs to be cross-layer designed which depends on information of MAC. However, it is difficult to apply existing cross-layer design into hybrid networks. Based on researches of congestion metrics from MAC layer over wireless networks, this paper proposes an cross-layer ECN scheme that TCP sender will trigger congestion control by ECN if RTS...
Many of packet loss as a result of factors other than congestion impact the performance of TCP in wired/wirelss hybrid networks. Firstly, this paper proposes one concept of congestion probability (CP) and analyzes the correlation of CP and network state. Then a transport control protocol named as TCP-PCP is proposed, which is based on the prediction of congestion probability instead of single loss...
In wireless local area networks (WLANs), the greedy closed loop control nature of TCP and the performance anomaly of wireless channel lead to the up/down and time unfairness problems between TCP flows. To achieve the wireless channel usage time fairness between the uplink and downlink TCP flows, we propose the up/down time fair LAS (UDTFLAS) scheduling algorithm. Taking into account the transmission...
It is important for TCP to provide a mechanism to differentiate between congestion losses and wireless random losses in wired/wireless hybrid networks, because the latter may cause a severe throughput degradation if TCP sender misinterprets such losses and reduces its window size. Being different from other approaches based on end-to-end metrics, BQM is an efficient loss differentiation algorithm...
In this paper, we have analyzed TCP packet transmission time of IEEE 802.11 MAC DCF protocol for wireless LANs a proposed enhanced backoff algorithm. It is considered the transmission time of TCP packet on the orthogonal frequency division multiplexing (OFDM) in AWGN channel. Also, to simulate wireless LANs system, we have assumed that three stations are operated, respectively. From the results, a...
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