In this paper, we propose an adaptive application-specific cooperative relaying mechanism for delivering layered coded multimedia data over wireless sensornetworks. The proposed approach is to optimally map source da...
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ISBN:
(纸本)0769530486
In this paper, we propose an adaptive application-specific cooperative relaying mechanism for delivering layered coded multimedia data over wireless sensornetworks. The proposed approach is to optimally map source data layers of different perceptual importance to relay nodes, so that the most important data layer can be transmitted in high quality. Each relay node only needs to detect and forward the assigned sub-streams (layers) of multimedia data. The distinctive benefit of this approach is to minimize the video distortion induced by buffer overflow and delay violation, while reducing transmission processing requirements on each relay node and providing significant savings in transmit and receive energy. Experimental results show that, compared with other cooperative methods, the proposed algorithm achieves significant performance improvement.
This paper investigates the use of cooperative communications in the context of IEEE 802.11b to combat radio signal degradation. The performance gain of both an existing cooperative protocol and the one proposed in th...
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ISBN:
(纸本)97830540726050
This paper investigates the use of cooperative communications in the context of IEEE 802.11b to combat radio signal degradation. The performance gain of both an existing cooperative protocol and the one proposed in the paper is discussed. It is quantitatively shown how much the two cooperative protocols increase throughput, lower delivery latency, and extend transmission span, when compared to the conventional IEEE 802.11b protocol. These features may help improve connectivity and network performance in ad hoc applications.
Monitoring technologies leveraging on heterogeneous sensornetworks are becoming increasingly important in almost every application scenario where pervasive data collection is needed. In current sensornetworks deploy...
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ISBN:
(纸本)0769530486
Monitoring technologies leveraging on heterogeneous sensornetworks are becoming increasingly important in almost every application scenario where pervasive data collection is needed. In current sensornetworks deployments, many low-level protocols and functions details dependent on used network technology are explicitly handled at application level, in a cross-layer fashion. This is not a critical issue in homogeneous networks, where services are provided by a unique network platform. However in applications where several multi-purposes heterogeneous sensornetworks coexist and interoperate, managing low-level details at application level can be a complex and time-consuming task, distracting the development of the back-end application logic. In order to overcome these limitations, it is necessary to de-couple low-layer details from application layer in order to achieve lower integration efforts, improve code reusability and gain higher flexibility. This paper describes the design of a framework for sensor network message processing and interpretation, focusing on issues related to the integration between sensornetworks gateways (the so-called "Sink nodes") and back-end applications. The proposed solution relies on NetPDL, an application-independent, XML-based packet format description language [4]. The advantages of this approach are highlighted by presenting three use-cases of the proposed solution.
USN networks can be classified into IP-based and non-IP-based. Each type may build its own management architecture based on a specific management protocol. For example, ZigBee networks are established without IP, but ...
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ISBN:
(纸本)9788955191318
USN networks can be classified into IP-based and non-IP-based. Each type may build its own management architecture based on a specific management protocol. For example, ZigBee networks are established without IP, but 6LoWPAN networks are based on IP, especially IPv6. There two different management schemes such as ZigBee Network Layer Management and SNMP are applied each to them. A centralized network management requires a common identification scheme for all managed objects within its management domain possibly consisting of multiple sensornetworks based on IP or non-IP. SNMP uses IP and OID (Object Identifier) for identification of managed objects. But ZigBee-like non-IP sensornetworks don't use IP and OID for object identification. This situation means a network manager should handle two identification schemes for every managed object within these two example networks. So, a higher layer abstraction of USN network management has been developed based on ID for a single and common identification scheme for all managed objects within a management domain, which can realize a transparent network management for various types of sensornetworks.
VANET is an application of a mobile ad hoc network to inter-vehicle communication. Each vehicle is aware of its position information by GPS or other methods. Position-Based routing is a useful approach in VANET The Po...
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ISBN:
(纸本)9781424414543
VANET is an application of a mobile ad hoc network to inter-vehicle communication. Each vehicle is aware of its position information by GPS or other methods. Position-Based routing is a useful approach in VANET The Position-Based routing protocol can be classified roughly into a next-Hop Forwarding method and a Directed Flooding method. We evaluate performance of both methods by analysis and simulation and compare them in this paper.
Securing future wireless networks will be a critical challenge as the popularity of mobile communications implies that wireless networks will be the target of abuse. The nextgeneration of wireless networks, as envisi...
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ISBN:
(纸本)9781424412679
Securing future wireless networks will be a critical challenge as the popularity of mobile communications implies that wireless networks will be the target of abuse. The nextgeneration of wireless networks, as envisioned by recent advances in cognitive radio (CR) technologies, will be autonomic and able to adjust their configuration to changes in the communication environment. Unfortunately, the authentication frameworks for various radio technologies, such as IEEE802.11 and 802.16, are quite different from one another and, in order to support radio reconfiguration, it is necessary to devise an appropriate authentication framework for CR systems. In this paper, we propose a radio-independent authentication protocol for CRs that is independent of the underlying radio protocols and able to support EAP transport. The re-keying protocol assumes user-specific information, such as location information, as a key seed. The keys for authentication and encryption are derived from the historical location registry of a mobile terminal. The keys are frequently updated as mobile users, position varies. After discussing authentication issues for CR networks, radio-independent authentication via location information, and application to EAP transport, we evaluate the confidentiality of the key management method and its integration with EAP, thereby supporting the effectiveness of our key management method for CR networks.
In two-tiered sensornetworks using relay nodes, sensor nodes are arranged in clusters and the higher-powered relay nodes can be used as cluster heads. The lifetime of the networks is determined primarily by the lifet...
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ISBN:
(纸本)97830540726050
In two-tiered sensornetworks using relay nodes, sensor nodes are arranged in clusters and the higher-powered relay nodes can be used as cluster heads. The lifetime of the networks is determined primarily by the lifetime of the relay nodes. Clustering techniques and routing schemes play a crucial role in determining the useful network lifetime. Traditionally, the clustering and the routing problems, for these networks, have been considered independently and solved separately. In this paper, we present a new integer linear program (ILP) formulation that jointly optimizes both clustering and routing to maximize the lifetime of such networks. We show that our integrated approach can lead to significant improvements over techniques that consider clustering and routing separately, particularly for the non-flow-splitting (single-path) routing model. We also propose a heuristic, based on LP-relaxation of the routing variables, which can be used for larger networks.
We propose and demonstrate a novel PON architecture to increase bandwidth per user and to alleviate degradation of analog video due to Raman crosstalk. Measurements of carrier-tospur ratio of analog video overlay are ...
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In this work, we present a novel routing protocol for energy constrained multi-hop wireless sensornetworks. The proposed mechanism exploits the broadcast nature of the wireless channel to enable cooperative relaying ...
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ISBN:
(纸本)9781424406135
In this work, we present a novel routing protocol for energy constrained multi-hop wireless sensornetworks. The proposed mechanism exploits the broadcast nature of the wireless channel to enable cooperative relaying in an on-demand manner. It also introduces the concept of leapfrogging that aids in circumventing links with weak channels. Further, in order to achieve energy efficiency, we define a novel metric that takes into account both location as well as channel state information for next-hop selection. The protocol is completely decentralized and preliminary analysis shows that the proposed approach offers significant benefits by reducing the number of (re)transmissions required to reach a destination. This translates into network-wide energy savings that can potentially increase the network lifetime.
This paper describes SEA-LABS (sensor Exploration Apparatus utilizing Low-power Aquatic Broadcasting System), a low-cost, power-efficient Wireless sensor Network (WSN) for sustained, real-time monitoring of shallow wa...
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ISBN:
(纸本)97830540726050
This paper describes SEA-LABS (sensor Exploration Apparatus utilizing Low-power Aquatic Broadcasting System), a low-cost, power-efficient Wireless sensor Network (WSN) for sustained, real-time monitoring of shallow water coral reefs. The system is designed to operate in remote, hard-to-access areas of the world, which limits the ability to perform on-site data retrieval and periodic system maintenance (e.g., battery replacement/recharging). SEA-LABS thus provides a customized solution to shallow-water enviromnental monitoring addressing the trade-offs between power conservation and the system's functional requirements, namely data sensing and processing as well as real-time, wireless communication. We present SEA-LABS' architecture and its current implementation. Finally, we share our experience deploying SEA-LABS in the Monterey Bay.
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