Proceedings of the 16th International Conference on Distributed Computing and Networking最新文献_第3页

Opportunistic Spectrum Access in CR Network in Licensed and Unlicensed Channels CR网络在许可和非许可信道中的机会性频谱接入

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684500

R. Yadav, R. Misra, Utkarsh Gupta, Sourabh Bhagat

{"title":"Opportunistic Spectrum Access in CR Network in Licensed and Unlicensed Channels","authors":"R. Yadav, R. Misra, Utkarsh Gupta, Sourabh Bhagat","doi":"10.1145/2684464.2684500","DOIUrl":"https://doi.org/10.1145/2684464.2684500","url":null,"abstract":"Cognitive radio networks (CRNs) is an emerging paradigm to exploit the spectrum holes very intelligently. In CRNs, it is important to use the under-utilized spectrum very effectively without affecting the primary users. However, the sudden appearance of the primary user forces the secondary user (SU) to hand-off to another available channel to continue it's transmission. CR system performances highly depend on the spectrum access behaviour of licensed users. Minimizing spectrum hand-off, blocking probability and dropping probability of secondary users (SUs) are the most challenging task in CRNs. Most of the existing dynamic spectrum access (DSA) schemes consider only licensed spectrum for the secondary users traffic without considering the transmissions also in the unlicensed bands. Thus to reduce dropping and blocking probabilities of secondary users, we extended classical schemes i.e. random access as well as reservation based channel access which consider unlicensed bands also. An analytical model based on 4-dimensional Markov chains is developed for random access as well as reservation access schemes that consider channel access opportunities in both licensed and unlicensed band. We studied opportunistic channel access problem for finite number of primary and secondary users. In addition, the hand-off, dropping and blocking probabilities of secondary users are derived as performance metrics and compared with the random scheme and reservation based schemes that do not considers unlicensed bands.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129757041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

SAGE-PRoPHET: A Security Aided and Group Encounter based PRoPHET Routing Protocol for Dissemination of Post Disaster Situational Data SAGE-PRoPHET:一种基于安全辅助和群体遭遇的灾后情景数据传播先知路由协议

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684492

Souvik Basu, S. Bhattacharjee, Siuli Roy, S. Bandyopadhyay

{"title":"SAGE-PRoPHET: A Security Aided and Group Encounter based PRoPHET Routing Protocol for Dissemination of Post Disaster Situational Data","authors":"Souvik Basu, S. Bhattacharjee, Siuli Roy, S. Bandyopadhyay","doi":"10.1145/2684464.2684492","DOIUrl":"https://doi.org/10.1145/2684464.2684492","url":null,"abstract":"In this paper, we propose SAGE-PRoPHET, a security enhanced PRoPHET routing protocol that enables secure dissemination of post disaster situational messages using history of group encounters. Post disaster rescue and relief operations are essentially group based, where volunteers and rescue workers, belonging to different rescue groups, relay situational information relevant to their group to their respective relief camps, in multiple hops on a peer-to-peer basis. Now, it is evidently better to route situational information, destined for a relief camp of a particular group, through volunteers of that group or who has a history of encountering volunteers of that group frequently. Such history of encounters based routing resembles the PRoPHET routing protocol for delay tolerant networks that forwards messages intended to a particular receiver through those nodes that encounter that receiver frequently. However, to use PRoPHET for such group based routing of group specific messages the protocol needs to be tuned to use history of group encounters rather than individual encounters. On the other hand, PRoPHET assumes that nodes in the network are trusted and cooperate towards message forwarding. Such assumption turns out inaccurate in presence of malicious nodes that may severely impede the delivery, accuracy and timeliness of situational messages. Therefore, integrating proper security components with PRoPHET is extremely important. Our proposed protocol adapts PRoPHET for post disaster group encounter based routing and enhances it by incorporating certain security elements into it to provide full security against possible attacks by malicious nodes in the network. Simulation results show that our proposed protocol, in a disaster scenario, offers better performance in comparison to other well known routing protocols.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125808569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

An adaptive P2P overlay for MANETs 一个自适应的P2P覆盖的manet

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684496

M. Seddiki, Mahfoud Benchaïba

引用次数: 11

Controlling Unfairness due to Physical Layer Capture and Channel Bonding in 802.11n+s Wireless Mesh Networks 802.11n+s无线Mesh网络中物理层捕获和信道绑定导致的不公平控制

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684486

Sandip Chakraborty, Sukumar Nandi

{"title":"Controlling Unfairness due to Physical Layer Capture and Channel Bonding in 802.11n+s Wireless Mesh Networks","authors":"Sandip Chakraborty, Sukumar Nandi","doi":"10.1145/2684464.2684486","DOIUrl":"https://doi.org/10.1145/2684464.2684486","url":null,"abstract":"This paper analyzes the effect of physical layer capture (PLC) and channel bonding over high throughput wireless mesh backbone network built over IEEE 802.11n+s standard. With the help of PLC, a signal can be recovered from channel noise and interference if the difference between the received signal strengths is more than a predefined threshold. It is well known that PLC can affect fairness during channel access by biasing towards the link with better signal strength. In this paper, we show that in the presence of channel bonding, high throughput links always suffer due to PLC, that ensues severe unfairness in a mesh backbone network. As a consequence, the performance of the network drops significantly from its actual capacity. This paper presents an adaptive bonding opportunity and channel reservation scheme to mitigate from network unfairness in an IEEE 802.11n+s mesh network. The performance of the proposed scheme is analyzed and evaluated using a 13 node mesh networking testbed. It has been observed that the adaptive bonding opportunity and channel reservation performs significantly better in terms of fairness compared to the standard, and results in a notable performance improvement for end-to-end flow parameters.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124145999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Mobility Aware Event Dissemination in VANET VANET中机动感知事件传播

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684498

J. Mukherjee, Arobinda Gupta

{"title":"Mobility Aware Event Dissemination in VANET","authors":"J. Mukherjee, Arobinda Gupta","doi":"10.1145/2684464.2684498","DOIUrl":"https://doi.org/10.1145/2684464.2684498","url":null,"abstract":"Many future VANET applications will be event-driven and will require events of different kinds to be delivered to vehicles en route in time. In this work, we propose a publish-subscribe based communication framework for a service provider (SP) that utilizes its roadside units (RSUs) to deliver relevant events to moving vehicles. Vehicles subscribe to a SP for specific types of events; the events are also reported to the SP. The SP delivers the events to the subscribed vehicles within the validity periods of both the subscriptions and the events through RSUs placed along the route of the vehicles. The problem is referred as the Minimum Cost Event Placement Problem [10] that schedules the placement of events in RSUs for different time intervals so that the events are delivered to the subscribed vehicles while incurring minimum cost of utilization of the RSUs. In this paper, we give a ln n approximation algorithm for the problem, where n is the number of subscriptions. We then propose a centralized online algorithm to solve the problem. A lower bound on the cost of utilization of the RSUs for a given set of subscriptions and events is presented next. Detailed simulation results in realistic city traffic scenarios are presented to show the performance of the algorithms.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123132052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

TADL: A Trust-Aware Dynamic Location-Based Protocol Suite For Discovering Multiple Paths in MANETs 一种基于信任感知的动态位置协议套件，用于发现manet中的多条路径

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684491

Helen Bakhsh, Ning Zhang, A. Carpenter

{"title":"TADL: A Trust-Aware Dynamic Location-Based Protocol Suite For Discovering Multiple Paths in MANETs","authors":"Helen Bakhsh, Ning Zhang, A. Carpenter","doi":"10.1145/2684464.2684491","DOIUrl":"https://doi.org/10.1145/2684464.2684491","url":null,"abstract":"This paper describes the design and evaluation of a multiple path discovery protocol suite aimed at finding a set of most trust-worthy paths for routing higher priority traffic towards a destination node with minimum overhead costs. The protocol suite, called a the Trust-Aware Dynamic Location-based (TADL) protocol suite, has taken three measures to optimize the path discovery outcome: (a) it uses a directional approach to broadcast route request packets to a destination, (b) it adjust the size of the searching area dynamically in response to the underlying network conditions, and (c) it uses trust values to govern the selection of neighbours in path formation and to reduce the overhead incurred in trust estimation, we have adopted a direct trust model. Measures (a) and (b) are take to minimise the level of broadcast traffic injected into the network in order to accomplish the path discovery task, and measure (c) is taken to ensure that the paths discovered are of best quality in terms of reliable packet deliveries. TADL is evaluated, using simulation, against the LAR protocol that has only implemented (a) (i.e. LAR only uses a location-based directional broadcast approach) under various network conditions. Our simulation study shows that TADL outperforms LAR in terms of reducing the routing overheads in the network. This overhead reduction can have a positive effect on QoS making the TADL more effective and efficient in providing QoS.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129906244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

On the Performance of Delegation over Cache-Coherent Shared Memory 基于缓存一致共享内存的委托性能研究

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684476

Darko Petrovic, Thomas Ropars, A. Schiper

引用次数: 7

Analysis of Floating Index Caching Technique for P2P Overlay Index Propagation P2P覆盖索引传播的浮动索引缓存技术分析

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684489

K. Haribabu, C. Hota

引用次数: 1

Improving Energy Efficiency of IO-Intensive MapReduce Jobs 提高io密集型MapReduce作业的能效

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684484

Nidhi Tiwari, S. Sarkar, M. Indrawan, U. Bellur

{"title":"Improving Energy Efficiency of IO-Intensive MapReduce Jobs","authors":"Nidhi Tiwari, S. Sarkar, M. Indrawan, U. Bellur","doi":"10.1145/2684464.2684484","DOIUrl":"https://doi.org/10.1145/2684464.2684484","url":null,"abstract":"Map-Reduce is a popular data-parallel programming model for varied analysis of huge volumes of data. While a multicore and many CPU HPC infrastructure can be used to improve parallelism of map-reduce tasks, IO-bandwidth limitations may make them ineffective. IO-intensive activities are essential in any MapReduce cluster. In HPC nodes, IO-intensive jobs get queued at the IO-resources while the CPU remain underutilized, resulting in a poor performance, high power consumption and thus, energy inefficiency. In this paper, we investigate which power management setting can be used to improve the energy efficiency of IO-intensive MapReduce jobs by performing a thorough empirical study. Our analysis indicates that a constant CPU frequency can reduce the energy consumption of an IO-intensive job, while improving its performance. Consequently, we build a set of regression models to predict the energy consumption of IO-intensive jobs at a CPU frequency for a given input data volume. We obtained same set of models, with different coefficients, for two different types of IO-intensive jobs, which substantiates the suitability of identified models. These models predict respective outcomes with 80% accuracy for 80% of the new test cases.","PeriodicalId":298587,"journal":{"name":"Proceedings of the 16th International Conference on Distributed Computing and Networking","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126854203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A Universal Approach to Data Center Network Design 数据中心网络设计的通用方法

Proceedings of the 16th International Conference on Distributed Computing and Networking Pub Date : 2015-01-04 DOI: 10.1145/2684464.2684505

Aditya Akella, Theophilus A. Benson, B. Chandrasekaran, Cheng Huang, B. Maggs, D. Maltz

引用次数: 15