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Analysis of Network Intermediate Connectivity is one of the important and challenging issues in Vehicular Adhoc Network (VANET). Gradually, intermediate connectivity among the nodes becomes a popular interesting research paradigm in high mobility domain. It depends upon the movement pattern of the vehicles and the routing of packet transmission depends upon the connectivity of the nodes. Among the...
In this paper, we investigate the topology boundary conditions in wireless mesh networks (WMNs) with focus on the maximum network diameter of such networks under different performance requirements. Specifically, we derive an end-to-end maximum node number upper bound, i.e., an upper bound on the network diameter as a function of end-to-end delay requirement, and an end-to-end maximum node number upper...
A mobile ad hoc network is much more assailable to attacks than a wired network due to its limited physical security, high mobility and lack of centralized administration. Jellyfish is a new denial of service attack. There are three kinds of JellyFish attacks i.e. JF Reorder Attack, JF Periodic Dropping Attack, JF Delay Variance Attack. In JF delay variance attack, intruder node needs to intrude into...
Wireless Mesh Networks (WMNs) are currently attracting a lot of attention due to their ability to provide cost-efficient broadband wireless connectivity. In this paper, we evaluate the performance of a WMN by simulations considering packet delivery ratio (PDR), throughput and delay. For simulations, we used ns-3 simulator and Hybrid Wireless Mesh Protocol (HWMP). We evaluate the performance of the...
This paper provides a simulation based procedure for evaluating video streaming over Bluetooth v2.1 + Enhanced Data Rate (EDR) and Bluetooth v3 + High Speed (HS) specification. For more realistic simulation of audio video transmission over Bluetooth network two mechanisms have been proposed. These mechanisms can be applied over upcoming Bluetooth specification and in more advanced Bluetooth streaming...
Transport layer performance in IEEE 802.11 mul-tihop wireless networks (MHWNs) has been greatly challenged by wireless medium characteristics and multihop nature which are the sources of several types of packet loss including collision, random channel errors and route failures. Rate control transport protocols, the candidates for multimedia streaming applications suffer from high loss rates and end-to-end...
Networks-on-Chip (NoC) with low-radix switches forming a simple and planar topology is typically accepted as the right interconnection infrastructure for current Chip Multi Processor and high-end Multi Processor System-on-Chip. This is mainly due to its simplicity in the physical mapping on the chip. However, as the network diameter increases, latency and power consumption are increased due to the...
As the number of processing elements which can be placed on a single chip doubles about every two years, both System-on-Chip (SoC) and the microprocessor market call for high-performance, flexible, scalable, and design-friendly interconnection network architectures [1]. Network-on-Chip (NoC) has been proposed as a solution to multi-core communication problems. The advantages of NoC include high bandwidth,...
In order to reach a high performance level in a street lighting control system, two important aspects must be taken into account: the selection of the adequate communication protocol, on the one hand, and the selection of the network topology that supports the architecture, on the other hand. Given these circumstances, the present paper focuses on an assessment of the performance of the mesh and tree...
In the context of more massive data to be processed and more processing elements (PEs) to be laid on a single chip or board, the requirements for corresponding interconnection network are becoming even higher. This paper presents a new topology called xtorus, and evaluates it by using both theoretical analysis and experimental simulation method. For theoretical analysis, an algorithm for computing...
This paper proposes cooperative opportunistic routing (COR), a throughput improvement scheme for the cooperative opportunistic routing in multi-hop wireless mesh networks (WMNs). We investigate the two major issues in opportunistic routing, the selection and the prioritization metric for the candidate set. The COR is presented to select and prioritize the candidate node with minimum expected cost...
NoC (Network-on-Chip) has been proposed as a new solution to deal with the global communication problem of complex SoC(System-on-Chip). An evaluation tool is essential for optimizing the NoC design, through which the functionality and performance of the NoC are verified. This paper presents a coverage-driven and hierarchical NoC verification platform based on System Verilog language. It is applicable...
We are motivated by the problem of designing a simple distributed algorithm for Peer-to-Peer streaming applications that can achieve high throughput and low delay, while allowing the neighbor set maintained by each peer to be small. While previous works have mostly used tree structures, our algorithm constructs multiple random directed Hamilton cycles and disseminates content over the superposed graph...
Superframe order value and beacon order value on IEEE 802.15.4 protocol determine the number of data packets that can be transmitted in each Superframe and also the length of the inactive period in each Superframe. This study uses Multihop networks. This study uses NS2 simulation to analyze the influence of the Beacon Order value and Superframe Order value to the performance of multihop wireless networks...
We study throughput-optimal scheduling in mobile ad hoc networks with time-varying (fading) channels. Traditional back-pressure algorithms (based on the work by Tassiulas and Ephremides) require instantaneous network state (topology, queues-lengths, and fading channel-state) in order to make scheduling/routing decisions. However, such instantaneous network-wide (global) information is hard to come...
Major challenge for TCP is to keep up the new and modern generation in communications networks such as networks with large bandwidth and long delay because when TCP applies on next generation networks will suffer from degradation in performance. The reason behind this shortcoming in performance is due to the congestion control mechanisms supported by TCP variants where these mechanisms depending on...
We analyze the problem of buffer sizing for TCP flows in 802.11-based Wireless Mesh Networks. Our objective is to maintain high network utilization while providing low queueing delays. The problem is complicated by the time-varying capacity of the wireless channel as well as the random access mechanism of 802.11 MAC protocol. While arbitrarily large buffers can maintain high network utilization, this...
In this study, the effects of time slot parameters on the performance of time domain switching optical burst switched networks (OBS) are studied. We investigate OBS networks where all core nodes are able to receive and send data. Network throughput is reduced when bursts are not able to secure necessary time slots for their transmission due to heavy contention at the core networks and lack of proper...
Mobile Ad-hoc Networks (MANETs) involve the establishment of wireless connections between mobile nodes, and can dynamically extend the coverage area of wireless local area networks (LAN). For MANETs that use a single channel, the communication performance decreases due to interferences between nodes when frames are being relayed. In this paper, we propose a priority control scheme based on neighbor...
In this paper we address the problem of spatialreuse scheduling for underwater acoustic communication (UWAC) networks that support high traffic broadcast communication and require robustness to inaccurate topology information. To this end, we derive a broadcast scheduling algorithm that combines topology-transparent and topology-dependent scheduling methodologies to achieve high-throughput in static...
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