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As an emerging technology, software defined networking (SDN) allows flexible control of network devices and supports user applications with guaranteed quality of service (QoS). To achieve flow transmission between two non-adjacent switches in SDN, efficient routing algorithm should be designed. In this paper, we jointly consider route selection and flow allocation problem. To stress the service sensitivity...
This paper focuses on the wireless monitoring sensor networks (WMSNs), where provide relay connectivity for the low capacity and power devices to monitor or sense the events in a monitoring area. In this paper, we propose the relay OFDMA resource allocation methods of coloring resource allocation, static resource allocation and dynamic resource allocation to improve the finite resource of time and...
While buffer-aided relaying improves the diversity of a multi-hop network, its deployment introduces time-delays, thus rendering buffering unreliable for delay-intolerant applications. To alleviate excessive delays, various studies propose delayaware protocols, but at the expense of reduced diversity, and consequently, increased outage probability. Attempts to maintain the diversity of the system...
In Wireless Sensor Network (WSN) applications such as environment monitoring, building monitoring, etc., sensor nodes collect data and send it to the base stations or sinks for analysis. As the networks grow in scale, it necessitates using multiple sinks in the network. In here, throughput capacity and the average delay of WSN with multiple sinks, which are two main quantity of interest, has been...
Increasing generated data volume and the rare bandwidth resource make the data delivery through vehicle-to-vehicle (V2V) a preferred mode for vehicular networks. However, in the urban vehicular environment, the traffic density information collected by the densely deployed cameras along the road were not used efficiently on the design of the data delivery policy. In this paper, a strategy for the decision...
Route discovery and maintenance in Mobile Ad-hoc Network (MANET) is a problem of long standing interest. In ad-hoc networks the Ad-hoc on demand Distance Vector (AODV) protocol assumes that discovered route is optimal and transmits data on it for the entire data session, whereas due to dynamic topology nodes change position dynamically, the optimum route may change. Thus, node mobility may give rise...
Delay and capacity (throughput) are two important parameters to route data packets in Mobile Ad Hoc Networks (MANETs). In this paper, a new connectionless routing algorithm has been proposed to overcome the performance limit. The proposed algorithm is an extension of dynamic virtual route (DVR) algorithm. Mobility degree of nodes' neighborhood is used to calculate two mobility metrics. Mobility metrics...
We propose a decode-forward protocol for streaming over a relay network using sequential random tree codes. An achievable bound on the end-to-end error performance is derived. The bound is parameterised by the number of errors occuring at the relay, which is the sum of correlated Bernoulli processes. The bound is useful for determining the achievable delay-exponent as well as for designing finite-delay...
Public sensing is an application in which sensory systems embedded in smart devices, vehicles, residential and public spaces form a collective cloud of data sources from which multi-owned access points realize end-users' service requests. This conception can be further extended under the umbrella of integrated RFID-Sensor Networks (RSNs) to include RFID systems. Such a configuration is heterogeneous...
By employing a relay station (RS) on the WiMAX networks, it offers an extended coverage and improved capacity over wireless broadband. However the mobile station (MS) such that connected to the RS has effect the system performance due to increase of the MS numbers. In WiMAX the base station (BS) adopts the centralized-based polling mode where the best way to guarantee the delay bound is by polling...
Due to the rapid growth of power demand, the aging problem of transmission lines becomes serious and has caused many problems to electric utilities and customers in terms of system reliability, power quality and customer satisfaction. In order to efficiently monitoring the power transmission system, a large number of sensors are deployed on the transmission line to form a Power Line Sensornet (PLSN)...
In this paper, we develop a queueing analysis for opportunistic decode-and-forward (DF) relay networks. It is assumed that the networks undergo Nakagami-m fading and that the external arrival process follows a Poisson distribution. By selecting the best relay according to the opportunistic relaying scheme, the source first transmits its signal to the best relay which then attempts to decode the reception...
Protection using telecommunications, such as the current differential protection schemes, are well known for their selectivity, sensitivity and fast operating times. Such advantages make them a desirable choice for the protection of high voltage transmission lines. However, the reliability and security of these protection schemes depends heavily on the performance of the telecommunication network,...
Cognitive Network is one of the most prevailing development directions in the future network, prominent in enhancing the utilization of the network resource. Although the research on routing mechanism in Cognitive Network arises more attention in the recent years, the current mechanism provides limited methods for ameliorating the instability performance caused by the mobility of the Cognitive Radio...
Using network coding (NC) in wireless networks can potentially improve the throughput and energy efficiency. On the other hand, it may result in longer delay because packets arriving early at the relay node have to wait to be network coded with other packets. In contrast, using traditional relaying allows the data packets to be forwarded as soon as possible, while its overall lower throughput (compared...
The IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX networks allow the extension of the coverage area of a WiMAX network by deploying a relay station (RS). In WiMAX, subscriber station (SS) located non Line-of-sight (LOS) with the BS suffers from deterioration in service. In this paper, we investigate the usage of RS in improving the per-user throughput. Simulations are performed using OPNET Modeler...
Promising machine-to-machine (M2M) communication emerges to achieve ubiquitous communications among objects and the surrounding environment in everyday life. For a large M2M network to support scrupulous connections among abundant devices, sharing radio resource efficiently with the existing wireless networks while maintaining sufficient quality-of-service (QoS) for reliable communications becomes...
Beaconless geo-routing protocols have been traditionally analyzed assuming equal communication ranges for the data and control packets. This is not true in reality, since the communication range is in practice function of the packet length. As a consequence, a substantial discrepancy may exist between analytical and empirical results offered in beaconless geo-routing literature. Furthermore, performance...
In many applications it is desirable to deploy unmanned autonomous vehicles to remote real-world locations, at considerable distance from any fixed infrastructure, rendering direct communication impossible; for example in the Wilderness Search and Rescue (WiSaR) scenario. However, data transfer between such vehicles and other participants is required for control, safety, monitoring progress and sharing...
A relay diversity scheme is proposed to provide diversity gain and better system performance in wireless fading environment. The hybrid relay diversity (HRD) scheme combines the concept of distributed space-time block coding (DSTBC) and relay cyclic delay diversity (RCDD) for OFDM-based relay communication network with more than one relay nodes. The scheme addresses the issue of achieving maximum...
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