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Today's laptops and mobile terminals are equipped with several network interfaces belonging to different access technologies. Users can benefit from multi-homing to access network services anywhere, at any time and from any network. Multipath TCP (MPTCP) is a modified version of Transmission Control Protocol (TCP) which allows a TCP connection to simultaneously send data over multiple paths. One of...
There is an unfairness between long-term TCP flows and short-term TCP flows because of the single queue and first-in-first-out scheduling algorithm in access point (AP) in WLAN. This paper suggests a priority scheduling algorithm. In the algorithm AP maintains one queue with a timer for each TCP flow. The scheduled orders of queues are based on values of timers. Network Simulator (NS) is used to simulate...
The impact of WPA2 security-bandwidth trade-off for IPv4 and IPv6 on wireless 802.11n network implementing Windows 7-Windows Server 2008 is investigated. The highest point of difference between open system and WPA2 for UDP was noticed at packet size 1408 bytes where IPv4 provided 31.48 Mbps and IPv6 provided 24.33 Mbps higher throughput in the open environment. The performance of IPv4 and IPv6 are...
The technology of flow-based QoS control on wireless LANs is receiving a lot of attention. There are several QoS technologies that can provide bandwidth guarantees by using TCP congestion control (QoS-TCP) and MAC control (QoS-MAC). Unfortunately, since QoS-TCP runs on the end terminal, it is possible that QoS-TCP will attempt to guarantee bandwidth without the permission of the network administrator...
More and more smart phones are equipped with the 3.5G and the Wi-Fi interfaces concurrently. Smart phones are able to share their 3.5G bandwidth for the other devices via the Wi-Fi connection. However, current technologies only allow one device to utilize the bandwidth provided from one Smart phone. In this paper, we propose Cooperative Stream Control Transmission Protocol (C-SCTP). C-SCTP enables...
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...
The demand for real-time communication over wireless LANs is increasing. In the infrastructure mode of IEEE 802.11, wireless terminals, or stations (STAs), share one access point (AP). Since TCP congestion control increases the congestion window size until packet loss occurs, TCP communication takes excessive bandwidth from other communications. Then, TCP communication affect the communication quality...
Several communication environments, supporting important operational scenarios such as deep space communications, Earth observation and mobile terrestrial communications, are extremely challenging for traditional TCP/IP protocols because of their intrinsic characteristic to not guarantee continuously an end-to-end path. An attractive application scenario is concerned the presence of terminals moving...
TCP has been a congestion control method in the Internet. However, since TCP is not able to directly measure the network status from the end nodes, the TCP window control gradually increases the congestion window size until congestion occurs. This control gets network bandwidth aggressively and affects communication of all stations (STAs) which belong to the same access point of IEEE 802.11 standards...
In high-speed and long-distance networks, TCP NewReno, which is the most popular version of TCP, cannot achieve sufficient throughput because of the essential nature of the congestion control mechanism of TCP. Therefore, Compound TCP has been proposed. Compound TCP can achieve a considerably larger throughput than TCP NewReno in high-speed and long-distance networks. The congestion control mechanism...
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...
Current Internet protocols like TCP have been designed to work well on channels with low channel error rates. Wireless channels on the other hand exhibit high loss rates when compared to wired channels. Current TCP implementations usually attribute packet losses caused by channel errors as being actually caused by congestion. The result is an unnecessary reduction of the sending rate which leads to...
Per-flow unfairness of TCP throughput in the IEEE 802.11 wireless LAN environment has been reported. Although a number of researchers have proposed various methods for alleviating the unfairness, they evaluated the fairness of their methods separately from the network bandwidth utilization, meaning that they did not consider the trade-off relationships between fairness and bandwidth utilization. In...
Multimedia streaming is increasing in popularity and has become one of the dominating services on the Internet today. Even though user devices are often equipped with multiple network interfaces and in reach of several access networks at the same time, media streams are normally communicated over only one of the available Internet connections. In this paper, we explore the challenges and potential...
We present a centralized integrated approach, ADWISER, for (i) managing an Internet access link bandwidth, and (ii) for enhancing the performance of an IEEE 802.11 WLAN. Our single-box approach is an extension to our previous work, where we focused on meeting TCP performance objectives over WLANs. In this work, we present a novel cascaded packet scheduling algorithm to address the issue of unfair...
The vision of future wireless networks is coexistence of current existing access networks. The different access networks will be bound together into a single network and the Internet Protocol (IP) will be the glue. To fulfill this vision, one of the most challenging parts is to develop sophisticated policies for vertical handovers. When and in what way the handoffs are performed affects the performance...
The number of wireless Internet service users that use wireless LAN or satellite links has increased. The broadband satellite Internet services have especially attracted attention because of its characteristics such as global coverage and robustness. TCP (transmission control protocol) is used by many typical applications over satellite Internet. However, a typical TCP (such as TCP-NewReno) which...
Next generation wireless networks will be generally identified based on their ability to successfully execute seamless Vertical Handoff (VHO). This prominent function gives an indication as to why VHO has become an important area of recent research works. Several works have succeeded in classifying VHO implementation into three distinct stages namely the policy repository stage, policy decision stage...
Available bandwidth in important performance criterion for performance. In this paper, we propose a new algorithm called Single Burst (SB) for measuring the available bandwidth between end hosts. Additionally, we provide mathematical analysis to derive approximate upper bounds on amount of exchanged data and measurement latency for SB. Finally, we present a comparison of measurement latency, accuracy,...
Network flows running on a wireless mesh network (WMN) may suffer from partial failures in the form of serious throughput degradation, sometimes to the extent of starvation, because of weaknesses in the underlying MAC protocol, dissimilar physical transmission rates or different degrees of local congestion. Most existing WMN transport protocols fail to take these factors into account. This paper describes...
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