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Relay node placement is one of the critical need of wireless sensor networks when connectivity, lifetime, fault tolerance like factors are desired in the network. In this study, we review the present relay node placement techniques and provide an overall view of this study by summarizing previous achievements. We categorize the placement strategies into four broad categories, namely, approximation,...
The data delivery in ICWN is accomplished in a collaborative manner, and non-cooperative behavior will gravely impair network QoP and user QoE. To select reliable relay nodes for data transmission, a trust-status-aware data forwarding strategy is proposed in this article. By exploiting locally recorded forwarding behavior information, process-based and relationshipbased credibility can be precisely...
Wireless sensor networks (WSNs) often operate in severe surroundings and may suffer simultaneous failure of multiple nodes which gets the network partitioned into distinct segments. Restoring connectivity among these segments is crucial in order to prevent the negative effects on the application. This paper investigates effective approaches for recovering from the failure for scenarios where the distance...
IEEE 802.16j mobile multi-hop relay network is proposed to enhance the system coverage, user throughput and the capacity of fixed/mobile broadband wireless access system in IEEE 802.16d/802.16e. Relay station (RS) enables data transmission between base station and end user when the channel is not good for transmission. Besides, one relay station also communicates with a pair of other relay stations...
Next Generation Network (NGN) is a broadband network that guarantees the quality of data transfers, independent of the lower transfer media, as real-time broadcasting services that are featured as a key service of the NGN require the multicast technique. Nevertheless, the existing IP multicast contains many limitations of application. Overlay multicast IP, an alternative to IP multicast, is a network...
Frequency reuse during access zone is widely adopted for throughput enhancement in IEEE 802.16j relay networks. Since areas covered by relay stations (RS) or base station (BS) may overlap, some mobile station (MS)s on the border between two neighboring transmitting stations (RS or BS) using an identical frequency band may suffer severe interference or outage. This co-channel interference within the...
In radio mobile cellular networks, the users located at the cell border suffer from a bad quality of service (QoS). Cooperative communication is a promising technique that can overcome this weakness by allowing these users to profit from powerful benefits of spatial diversity. Nevertheless, abstraction is usually made on the impact of the additional multiple access interference inherent to relaying...
This paper evaluates the QoS performance of transporting voice using WiMAX MBS (multicast/broadcast service). Our results demonstrate that the proposed MBS architecture can address several design issues arising from the mobility of the relay stations and the mobile stations. The service architecture is feasible for voice transport in the WiMAX multi-hop network.
The IEEE 802.16 standard recently introduced an additional relay mode of operation permitting coverage extension of the point-to-multipoint (PMP) based WiMAX networks. Relays can further aid in increasing the achievable data rates for subscriber stations (SS) in the network. Although bandwidth management and scheduling have been studied in some detail in traditional IEEE 802.16 PMP networks, the corresponding...
The increasing popularity of mobile wireless networks and various numbers of wireless networks becomes an important challenge. The future generation of wireless networks is expected to integrate a potentially large number of heterogeneous wireless technologies in what could considered a huge step toward universal seamless access. The topology management became here one of the main challenges. Efficient...
Application relay is important for many delay-sensitive applications such as voice over Internet protocol (VoIP). It has been proved that relay selection would be optimized considering autonomous domains (ASes) relationship. We describe a new method for relay selection using service discovery in distributed hash table(DHT) in which relay service advertisements are indexed and clustered according to...
Topology control and energy saving is one of the most important challenges in wireless ad hoc sensor networks. There are two approaches for conserve energy in topology control algorithms. First by adjusting a node??s transmission power and second manipulating a node??s state. In this paper, multi-state k-fault tolerant topology control algorithm is presented using clustering technique to manage k...
Topology Control and energy saving is one of the most important challenges in wireless sensor networks because of Special characteristics of these networks such as limited transmission range, low bandwidth, limited power resource and the impossibility of recharging. In this paper, k-fault tolerant clustering topology control algorithm is presented. This algorithm named QoS-based clustering topology...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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