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Multihoming and mobility in IPv6 are usually considered as two disjoints concepts. This has lead to the development of the two protocols family separately. However, the new IPv6 terminals are most of the time mobile and are equipped with multiple interfaces. Thus, we need to adopt a new vision toward multihoming and mobility and propose new solutions to manage both of them. In this paper, we focus...
We illustrate the transport layer unfairness problem in the IEEE 802.11 wireless local area networks (WLANs). We propose a novel and simple analytical model to calculate the per-flow congestion window limit that provides fair TCP access in a wired/wireless scenario where the wireless hop is an 802.11 link. The proposed analysis is unique in that it considers the effects of varying number of uplink...
Existing terminal oriented handover mechanisms capable of meeting the strict delay bounds of real time applications such as VoIP do not consider the QoS of candidate handover networks. In this paper ECHO - a QoS based handover solution for VoIP- is proposed. ECHO is endpoint centric and does not require any network support; it leverages the SCTP transport protocol. ECHO incorporates network metrics...
The use of 802.11-based multi-hop wireless mesh networks for Internet access is extensive and growing. The primary advantages of this approach are ease of deployment and lower cost. However, these networks are designed for web and e-mail applications. Highly interactive applications, such as multiplayer online games and VoIP, with their requirements for low delay, present significant challenges to...
In this paper we show how traditional indoor channel models do not accurately reflect the real behavior exhibited by TCP when operated over error-prone wireless links, especially due to the large variability which is empirically observed. In contrast with them, we use a novel channel model, based on an auto-regressive filtering scheme, and which we have integrated into the Network Simulator framework,...
We compute the throughput obtained by a TCP connection in a UMTS environment. For downloading data at a mobile terminal, the packets of each TCP connection are stored in separate queues at the base station (node B). Also due to fragmentation of the TCP packets into Protocol Data Units (PDU) and link layer retransmissions of PDUs there can be significant delays at the queue of the node B. In such a...
We propose a packet scheduling discipline called virtual flow queueing (VFQ) to improve the end-to-end performance of TCP connections over IEEE 802.11 WLANs. VFQ is based on an inter-layer approach: the IP layer schedules packets over the wireless link according to the information coming from both the transport and MAC layers. The scheduler computes virtual transmission times that take into account...
Deploying large-scale wireless citywide networks with strong authentication mechanisms has received considerable interest in industry and academic circles. In this paper, we present modified Transport Layer Security (TLS) protocols which leverage Trusted Platform Module (TPM) technologies to achieve both user and device authentication. The first protocol leverages TPM attestation capabilities, while...
The poor performance of TCP in wireless networks is further diminished in IEEE 802.11-based ad hoc networks networks due to the unnecessary actions of on-demand routing protocols when interference-induced packet drops happen at the medium access control (MAC) layer. In this paper, we present a cross-layer hop-by-hop congestion control scheme designed to improve TCP performance in multihop wireless...
We present the implementation architecture and performance evaluation of the nanoIP protocol stack. The stack consists of miniaturized versions of UDP, TCP, SLP and HTTP protocols with reduced header sizes and complexity to make the protocols usable in wireless sensor networks. Similarity to the TCP/IP stack facilitates the development of gateways towards IP-based networks and makes the use of the...
Enormous gains of using multiple antennas at both the transmitter and the receiver known as multiple-input multiple-output (MIMO) in wireless communication system have been predicted. Especially, significant improvements in spectral efficiency are given through spatial multiplexing which transmits independent data streams over multiple transmit antennas simultaneously. Recently, many researches demonstrate...
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