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Wireless clients must associate to a specific Access Point (AP) to communicate over the Internet. Current association methods are based on maximum Received Signal Strength Index (RSSI) implying that a client associates to the strongest AP around it. This is a simple scheme that has performed well in purely distributed settings. Modern wireless networks, however, are increasingly being connected by...
Energy consumption is a concern with mobile de-vices nowadays. Network interfaces are among the most power hungry components in these devices. In this paper, we describe the design and implementation of a client-centric protocol for energy efficiency. Inspired by earlier work, our protocol works by exploiting the TCP flow-control mechanism to shape incoming traffic into bursts in order to utilize...
The TCP throughput deteriorates in networks with large bandwidth-delay product, and new congestion control algorithms have been proposed to address such deterioration. Traditional TCP protocols treat all packet loss as a sign of congestion. Their inability to recognize non-congestion related packet loss has significant effects on the communication efficiency. The proposed protocols such as TCP - Reno,...
In this paper we model the data traffic congestion scenario in a vehicular ad-hoc network, and we apply the Adaptive PI Rate Controller (APIRATE) to deal with the congestion. Derived from classical control theory, the APIRATE controller performs AQM (Active Queue Management) by controlling the source rate based on the instantaneous queue length of the congested node. We then study the performance...
Mobility management solutions designed for heterogeneous networks can provide seamless handover and service continuity. Thus, ongoing TCP sessions can remain active, even when mobile node handovers from one access network to another. In such seamless handover, packet loss can be avoided but TCP still undergoes through several performances degradation issues due to change of network characteristics...
Tremendous efforts have been conferred towards the congestion control concern in mobile wireless networks while dealing with maximizing both throughput and fair bandwidth allocation. Unfortunately, this is made limited by the variable and unpredictable behaviour of such networks. In this paper we propose a new congestion control mechanism for multimedia traffic in mobile wireless networks. Our proposed...
The traditional TCP Reno, TCP Vegas and many other TCP variants used in wire network can not perform well in ad hoc environment. Because ad hoc network usually uses wireless channel and it has not the base station. And more, the ad hoc node can be mobile. The mechanism of detecting congestion by packet losses can not be valid. In ad hoc network, temporary link outages or fading-induced bit errors...
Ad hoc network is network in which there is no base station and any node can be connected to network temporarily. To support mobility, Node in ad hoc network generally communicates by wireless channel. In Ad hoc network, TCP Reno or TCP Vegas do not work well as they do in wire network, because they take packet losses or timeout as the signal of congestion. However, in ad hoc network, temporary link...
The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. A new operational mode, called the WAVE (Wireless Access in Vehicular Environments) mode, is defined to enable communication among high-speed vehicles or between a vehicle and a roadside infrastructure network. In the WAVE mode, a mobile/stationary station uses a combined FDMA/TDMA channel...
This paper proposes a novel multi-channel MAC protocol for mobile ad hoc networks that enables the nodes to transmit packets in distributed channels. In our protocol, the ATIM window is divided into two windows. The first window is called deciding channel window (DCW). The source nodes and destination nodes can negotiate to decide a channel that can be used to compete the final data channel in the...
Using the application of bluck data transfer, we investigate the performance of QoS-satisfied pathover for transport layer mobility scheme such as mSCTP in FMIPv6 envirmonment. We find that existing scheme has some defects in aspect of pathover and throughput. Based on this, we make a potential change to mSCTP by adding QoS-Measurement-Chunk, which is used to take into account information about wireless...
Based on the analysis of the node selfishness and the drawback of min-hop selection method as the unique routing selection criteria in ad hoc networks, a non-intrusive multi-metric ad hoc routing protocol-NIMR is presented. By computing and storing the node fame, NIMR greatly attenuates the influence of node selfishness; By crossing-design between MAC layer and network layer, we employ a non-intrusive...
In a MANET environment, communication links are unstable due to various reasons. Error rate is higher and bandwidth is smaller than fixed networks. Running conventional TCP protocol over MANET will suffer from severe performance degradation. To handle a packet loss, conventional TCP retransmits the lost packet from its source. However, when error rate is high, it may have to take several retransmissions...
Wireless multi-hop network is a kind of multi-hop broadband distributed wireless network with high capacity and high transmission rate. One of the major problems of wireless networks is the capacity reduction due to the interference among multiple simultaneous transmissions. In order to effectively minimize the effect of interference, this paper presents a new routing metric called WLQM which considers...
In this paper we introduce a prioritization scheme for enhancing the performance of the authentication process in vehicular networks using dedicated short range communications (DSRC). We consider the authentication as a service that should be required by each user in order to gain access to the network and to the offered services. Instead of using a unique channel to transmit the messages of the authentication...
TCP-friendly rate control(TFRC) is an equation-based congestion control mechanism that competes fairly with TCP but has a much lower throughput variation, which makes it a better choice for streaming over the Internet. It is known that in a mobile network environment, after a handover TFRC can overshoot or under utilize the new link if the conditions there differ from those of the old link. There...
Based on an identification and evaluation of the subtle counterproductive interactions between the WLANs MAC layer and the transport layer, this paper shows a new approach towards congestion control for WLANs. We introduce a specialization of TFRC (MTFRC: mobile TFRC), which is adapted to wireless access networks. This TFRC specialization requires only slight changes to the standard TFRC protocol...
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