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Performance of Handover for Multiple Users in Heterogeneous Wireless networks

Performance of Handover for Multiple Users in Heterogeneous ...

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ieee 34th conference on local computer networks

作者： Fiterau, Madalina Ormond, Olga Muntean, Gabriel-Miro Politehn Univ Timisoara Dept Comp Sci Timisoara Romania Dublin City Univ RINCE Network Innovat Ctr Dublin 9 Ireland Dublin City Univ Sch Elect Engn Performance Engn Lab Dublin 9 Ireland

ISBN: (纸本)9781424444885

Handover solutions ensuring seamless connectivity and high user-perceived quality of service for a given application context are essential for multi-mode wireless devices in heterogeneous wireless network environments. A critical handover step, the network selection decision, is automatically and transparently made in the user's terminal, aiming to keep the user "always best connected". We propose Quantified Adaptive Delay Selection (QADS), a novel multi-user-aware handover algorithm that maintains high quality of service levels for mobile users performing handover in heterogeneous wireless network environments. QADS is a user-centric solution buildt on the ieee 802.21 Media Independent Handover standard. It addresses the problem of multiple mobile nodes performing network selection independently, using the same selection algorithm. With innovative mechanisms based on adaptive contention and randomization, the algorithm increases overall user-perceived quality of service.

关键词： Quality of service

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Connection Degree-based Message Delivery Scheme for Improving Service Discovery in Mobile Ad-Hoc networks

Connection Degree-based Message Delivery Scheme for Improvin...

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ieee 34th conference on local computer networks

作者： Kong, Eunyoung Chae, Jinseok Park, Heemin Univ Incheon Dept Comp Sci & Engn Inchon South Korea Samsung Elect Co Ltd Image Dev Team Suwon South Korea

ISBN: (纸本)9781424444885

Service discovery is an essential protocol in mobile ad-hoc networks as it is used to search for available services. It is becoming an important issue because of node mobility and requirements of low number of messages. this paper proposes a service discovery scheme which combines cooperative service information spreading of adjacent nodes and the higher degreebased search protocol in mobile ad-hoc networks. It proposes an algorithm for selecting adaptive nodes from mobile nodes, which enables search and utilization of up-to-date information in MANET. the proposed method is effective, since it does not require a central lookup serer and it does not rely on flooding. the simulation results show that the proposed scheme reduced the total network Road and power consumption. Compared to other systems, it significantly reduces the number of messages and the average number of response hops, and thus improves the response time and power consumption.

关键词： Mobile ad hoc networks

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Content Registration in VANETs-Saving Bandwidth through Node Cooperation

Content Registration in VANETs-Saving Bandwidth through Node...

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ieee 34th conference on local computer networks

作者： Wewetzer, Christian Scheuermann, Bjoern Luebke, Andreas Mauve, Martin Volkswagen Grp Letter Box 1777 Wolfsburg Germany Univ Dusseldorf Comp Networks Grp Dusseldorf Germany

ISBN: (纸本)9781424444885

Search indices for distributed information are an important building block for many mobile, decentralized applications. However, the network load caused by nodes registering their information in the index can become quite significant especially in mobile networks like vehicular ad-hoc networks (VANETs), where nodes need to register periodically due to their mobility. Our goal in this paper is to encode this registration information as efficiently as possible. For this purpose, we first analytically study hash keys and Bloom filters as alternative encoding types of nodes' registration data. It turns out that in many situations, Bloom filters are more bandwidth efficient than hash keys, and that they are even more efficient when nodes cooperate. Many such forms of cooperation are conceivable;we define one specific scheme targeting metropolitan VANETs. Our accompanying simulation study shows that this first algorithm already allows for large bandwidth savings in content registration, compared to the alternative of registering hash keys.

关键词： Vehicular ad hoc networks

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A Single Radio Based Channel Datarate-aware Parallel Rendezvous MAC Protocol for Cognitive Radio networks

A Single Radio Based Channel Datarate-aware Parallel Rendezv...

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ieee 34th conference on local computer networks

作者： Jiao, Lei Li, Frank Y. Univ Agder UiA Dept Informat & Commun Technol N-4898 Grimstad Norway

ISBN: (纸本)9781424444885

Channel hopping based parallel rendezvous multichannel MAC protocols have several advantages since they do not need a control channel, require only one transceiver, and produce higher system capacity. However, channel hopping sequences in existing parallel rendezvous MAC protocols have been designed as irrelevant to channel datarates, leading to under-utilization of channel resources in multi-rate multi-channel networks. Considering that datarates among channels may be different, we propose a dynamic parallel rendezvous multichannel MAC protocol for synchronized cognitive radio networks in which the secondary users adjust their own distinct hopping sequences according to the datarates of the available channels, in a datarate-aware manner. A Markov chain based model has been developed to analyze the aggregate datarate of the proposed protocol. Numerical results show that the proposed method can improve the aggregate datarate significantly, compared with that of the existing parallel rendezvous MAC protocol.

关键词： Cognitive radio networks MAC protocol Parallel rendezvous Datarate-aware

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Understanding and Enhancing the Scalability of IMS-based Services for Wireless local networks

Understanding and Enhancing the Scalability of IMS-based Ser...

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ieee 34th conference on local computer networks

作者： Bellavista, Paolo Corradi, Antonio Foschini, Luca Univ Bologna Dipartimento Elettron Informat & Sistemist I-40136 Bologna Italy

ISBN: (纸本)9781424444885

the increasing request for mobile multimedia services have motivated relevant standardization efforts, such as the IP Multimedia System (IMS) to support session control, mobility, and interoperability in all-IP next generation wireless networks. Notwithstanding their increasing diffusion, IMS solutions still exhibit limited support for service scalability, especially for data intensive services such as mobility management, presence, and instant messaging, by omitting clear design guidelines and techniques to (re-)distribute incoming load dynamically. the contribution of this paper is twofold. First, it thoroughly analyzes the state-of-the-art literature in the field to clarify all main IMS scalability issues. Second, it proposes a novel and widely applicable architecture of solution based on three original guidelines: data-centric session management;differentiated management of intra-/inter-domain communications;service-aware load-balancing at both infrastructure and service levels. Preliminary performance results collected in the IMS-enabled wireless infrastructure at our campus demonstrate the effectiveness of the proposal.

关键词： IP Multimedia Subsystem (IMS) Presence Service (PS) Scalability Load-balancing Intra-/Inter-domain PS Optimizations

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Managing Rescue and Relief Operations Using Wireless Mobile Ad Hoc Technology, the Best Way?

Managing Rescue and Relief Operations Using Wireless Mobile ...

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ieee 34th conference on local computer networks

作者： Khoukhi, L. Cherkaoui, S. Gaiti, D. Univ Technol Troyes FRE CNRS 2848 ICD ERA 12 Rue Marie Curie F-10010 Troyes France Univ Sherbrooke Interlab Sherbrooke PQ J1K 2R1 Canada

ISBN: (纸本)9781424444885

the self-organizing and decentralized features of wireless mobile ad hoc networks make them suitable for a wide variety of applications. In this paper, we explore their use in rescue and relief applications in emergency situations. We propose to study the efficiency of some routing and MAC protocols under the Client-Server architecture. the presence of dynamic and adaptive routing and MAC protocols will enable ad hoc networks to be formed quickly, and ensure communications during the rescue operations. Extensive simulations were performed to show the impact of both the routing and MAC layer choice over multiple QoS parameters (delay, throughput, energy, etc.) in small and large scales rescue areas. We conclude the paper by some remarks that may be very useful for the relevant agencies to enhance the efficiency of rescue and relief operations.

关键词： Wireless mobile ad hoc networks rescue operations routing and MAC protocols network performances

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Improving Radiation Oncology Using a Low-Cost Wireless Accelerometer

Improving Radiation Oncology Using a Low-Cost Wireless Accel...

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ieee 34th conference on local computer networks

作者： Farahmand, Farid Khadivi, K. O. Rodrigues, Joel J. P. C. Sonoma State Univ Dept Engn Sci Rohnert Pk CA 94928 USA Austin Canc Ctr Austin TX 78702 USA Univ Beira Interior Inst Telecommun P-6201001 Covilha Portugal

ISBN: (纸本)9781424444885

Born on military applications, wireless sensor networks span over to different application fields, namely on eHealth and medical applications. In this paper we discuss a high-precision, non-intrusive, wireless, accelerometer-based patient movement monitoring system (APMMS) in determining positional change in patients undergoing radiation treatment. Using this system a small wireless accelerometer sensor is placed on patient's skin, broadcasting its precise position to the receiving station connected to a PC in the control area. A threshold-based algorithm is developed to identify the exact amount of patient's movement and its direction. Our results indicate that, in spite of its low-cost and simplicity, APMMS is highly sensitive and offers accurate measurements.

关键词： Position Monitoring System Wireless Sensor networks Body Sensor networks

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Backbone MAC for Energy-constrained Wireless Sensor networks

Backbone MAC for Energy-constrained Wireless Sensor Networks

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ieee 34th conference on local computer networks

作者： Waelchli, Markus Zurbuchen, Reto Staub, thomas Braun, Torsten Univ Bern Inst Comp Sci & Appl Math CH-3012 Bern Switzerland

ISBN: (纸本)9781424444885

In this paper we propose a routing backbone construction mechanism that exploits and uses the synchronization messages exchanged by synchronized contention-based MAC protocols. Due to the usage of synchronization messages no additional control traffic is required to setup the routing backbone. Every node running a synchronized contention-based MAC protocol follows a given listen/sleep cycle. Because routing is supported by the backbone, non-backbone nodes can temporarily turn off their radios for multiple listen/sleep cycles. thus, additional energy can be saved. Accordingly, non-backbone nodes do not have to wake up in every listen/sleep cycle to synchronize with other nodes, but wake up only if required, i.e., if they have to report some sensor readings to a base station. In this case, they synchronize to the backbone, send their data, and go back to sleep after successful transmission. Our approach is applicable to rather static networks with mainly source-to-sink traffic. Most monitoring applications are of this kind.

关键词： Sensor networks medium access control backbone construction

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A Cross Layer Framework to Mitigate a Joint MAC and Routing Attack in Multihop Wireless networks

A Cross Layer Framework to Mitigate a Joint MAC and Routing ...

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ieee 34th conference on local computer networks

作者： Djahel, Soufiene Nait-Abdesselam, Farid Khokhar, Ashfaq Univ Lille IRCICA UMR CNRS USTL 8022 LIFL Lille France Univ Illinois Elect & Comp Engn Dept Chicago IL USA

ISBN: (纸本)9781424444885

It is well known that security threats, in wireless ad hoc networks, are becoming a serious problem which may lead to harmful consequences on network performance. Despite that, many routing protocols still not resilient to such threats or their countermeasures are not efficient. Moreover, the vulnerability of MAC layer protocols to some attacks exacerbates the damage caused by the threats at higher layers. therefore, cooperation between layers in compulsory to face such devastating threats. In this paper, we address a cross-layer attack targeting proactive routing protocols, which is launched at the routing level and reinforced at the MAC layer in order to amplify the resulted damage. We demonstrate that this attack can severely compromise the routing protocols and lead to large data packets loss. We particularly analyze it under the Optimized Link State Routing (OLSR) protocol in detail and propose a lightweight solution to cope with it. the simulation results confirm the efficiency of this solution.

关键词： Cross-layer Attack Virtual-link Attack False Validation Attack Ad Hoc networks OLSR

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A Bridging-based Solution for Efficient Multicast Support in Wireless Mesh networks

A Bridging-based Solution for Efficient Multicast Support in...

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ieee 34th conference on local computer networks

作者： Hadjadj-Aoul, Yassine Murphy, Sean Murphy, Liam Univ Coll Dublin UCD Sch Comp Sci & Informat Dublin 4 Ireland

ISBN: (纸本)9781424444885

Wireless mesh networking is a promising, cost effective and efficient technology for realizing backhaul networks supporting high quality services. In such networks, multicast data are transmitted blindly without any mechanism protecting data from loss, ensuring data reception, and optimizing channel allocation. the multicast services may undergo, then, very high data loss ratio which is exacerbated with the number of hops. In this paper, we propose a Reliable Multicast Distribution System (RMDS) to optimize multicast packets transmission in bridged networks. Relying on a modification of the IGMP snooping protocol, RMDS enables reliable services provisioning support in common wireless mesh networks. In particular, RMDS only exploits the local knowledge of a particular node to compute the multicast tree, which significantly reduces the signalling overhead in comparison with network layer and overlay solutions. Simulation results elucidate that RMDS optimizes resources' allocation by reducing significantly the network load, the media access delay and the data drop rate compared to the classical approach, which is based on the combination of spanning tree algorithm and IGMP snooping protocol.

关键词： Reliable Multicast IGMP Snooping Mesh networks Bridged networks

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