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Network coding has been shown to be able to improve the throughput and power efficiency of wireless networks by mixing packets from different flows into a single packet. However, forcing packets to be coded may induce large delay and packet loss rate which is intolerable to some services such as real-time communications. Considering the diversity of traffic flows and the stochastic nature of the packet...
This article makes a taxonomic study of wireless traffic using a model of self-similarity based on traffic components at the link, network and transport layer. We evaluate applications performance using two different simulation scenarios in which the traffic is defined according to the statistical parameters observed in real traffic. The simulations evaluate network performance using different compositions...
In this paper we investigate the time delay propagation rates in a Vehicular Ad-Hoc Network, where vehicular connectivity is supported by both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) protocols. In our vision, seamless connectivity issues in a VANET with nearby network infrastructure, can be fixed by an opportunistic choice of a vehicular protocol between V2V and V2I. Such a decision...
A four-node wireless network model is designed based on NS2 simulation platform software. The network performance, such as System delay, Packet loss rate, Throughput and other key indicators are simulated in this paper. By running of TCP and UDP protocols, we make the analysis and evaluation to network performance from different aspects, and then, associated parameters were compared graphically with...
In this paper, we analyze and evaluate the cost-delay trade off of opportunistic network coding in a two-way relay network with asymmetric arrival rates. We first formulate the variance of the queue into a Markov chain and derive the transition probability and the stationary distribution. Then we analyze the average power cost and delay, formulate the optimal power-delay trade off, and propose a heuristic...
Aiming at the problems of the different authentication information and authentication methods in heterogeneous wireless network, based on the idea of the separation of identity, position, addressing etc information, the paper puts forward the unified client identity, and builds a complete client identity hiding and substitution mechanism, which effectively solve the moving terminals unified access...
Widespread delivery of the same data content continues to be a challenging problem especially in a wireless network. For a network it is desirable to have more than one way to multicast data from source to destinations. Multicasting, especially with a tree structure, has been shown to be an effective methodology to distribute data. By using a multicast tree the source node is not burdened by trying...
IEEE 802.11 wireless networks have received much attention over the past number of years. Still certain aspects of behavior of wireless networks have not been studied well enough. For example, understanding MAC layer packet delay distribution remains challenging yet. However, obtaining such distribution is highly beneficial for modeling QoS provided by wireless networks. This paper proposes a way...
TCP is the main transport-layer communication protocol in traditional wired networks. This is also due to its efficient behavior in presence of congestion events. However, networks with wireless links and mobile hosts provide significant non-congestive losses due to bit error rate, host motion and handover mechanisms. TCP incorrectly interprets these events as a sign of network congestion, throttling...
In this paper, IP mobility management protocols have been analyzed and compared in terms of handover latency and packet loss during handover management. Numerical results show that FHMIPv6 outperforms other protocols in the case of packet loss and handoff latency. Effect of L2 triggering time, packet arrival rate and average queuing delay at access router on handoff latency and packet loss have been...
In this paper, we consider a wireless cellular network with support for client relay. As such, neighboring clients may cooperate with each other sending uplink data packets. Client relay technique has recently been shown to considerably improve the performance of cell-edge users with poor communication link. We extend our three node client relay system analysis to a more realistic scenario with limited...
Congestion control for wireless networks is much more challenging than that for wired networks, due to the limited wireless spectrum and severe impairments of wireless medium which suffer time-varying fading, shadowing, interference, etc. Although the stability of the Internet using TCP congestion control and active queue management (AQM) schemes has been extensively investigated, effective congestion...
This The duration of a standard MIPv6 (Mobile IPv6)handover process is relatively long for many real-time sensitive applications. Many earlier proposed solutions of this problem aim on reducing the duration of the address registration and configuration processes during a handover. There are only few paper intended to shorten the DAD (Duplicate Address Detection) process in a MIPv6 handover. In this...
In this paper, we propose a cross-layer optimization approach for replication of video streaming over multihop wireless network by jointly taking into account application, network, MAC, and physical layers. Specifically, we design a middleware replication strategy layer with a stack profile, in which parameters across the hops and all considered layers are exchanged for optimal video replication....
In densely deployed IEEE 802.11 wireless networks, the transmission delay experienced by a user depends not only on the traffic load of the associated AP, but also the contention level of other APs operating on the same channel. However, due to the random distribution of users and inappropriate allocation of AP channels, the traffic loads of different APs are often uneven, leading to unfair delay...
We study the capacity of ad hoc network with heterogenous traffic patterns, specifically on the fields of multicast and unicast traffic. We apply hierarchical cooperation scheme, MIMO technology and multihop transmission mechanisms in both traffic patterns. The major contribution of this paper is a new capacity analysis method and procedure for the network with heterogenous traffic patterns. Based...
Periodic packet transmission in fading channel is an important issue in wireless networks, where the nodes can save energy, as it is powered by batteries. In mobile radio communication system, communication takes place over time-varying channels. This time variation is called as fading. Fading is the direct result of multi-path propagation where radio waves propagate along different paths before arriving...
We address the problem of minimum average packet delay of Multi-hop Wireless Networks (MWN) which uses network coding. Our objective is to allocate capacities to different wireless nodes in a way that the average packet delay in the network is minimized under the assumption that the network topology, the traffic matrix in the network, and routing are given. Exploiting queueing theory as well as wireless...
The widespread use of heterogeneous wireless network technologies and their integration with multi-mode terminals enable users to be associated to the best available networks according to user preferences and application specific requirements. We study a user-centric quality of experience based resource allocation problem with several operators, several types of users and different classes of services...
A distance based power control scheme is proposed and developed for application-controlled handover (ACH) in wireless personal area network (WPAN). In this paper, a power efficient communications in the wired wireless synergy network environment that consists of 3G (UMTS) + WiMAX + WLAN + WPAN (UWB) and optical network has been developed. This paper presents an enhanced power controlled transmission...
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