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Research on physical conflict model based power allocation and link scheduling in MRMC wireless networks

Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice 2011年第SUPPL. 2期31卷 101-104页

作者： Guo, Ya-Hong Wang, Xian School of Information Science and Technology Heilongjiang University Harbin 150080 China School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150080 China

In order to improve the network spatial reuse and maximize the network throughput, this paper presents a physical conflict model based power allocation and link scheduling algorithm (PPLA). Firstly, PPLA picks available set of parallel links using hexagon coloring method. With physical conflict model, it further obtains the minimum power vector which corresponds to parallel links set. The experimental results indicate that the algorithm can increase network spatial reuse ratio and improve throughput significantly.

关键词： Throughput

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RETRACTED ARTICLE: Collaborative filtering based on time division

RETRACTED ARTICLE: Collaborative filtering based on time div...

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作者： Yang, Yan Yun, Long Department of Computer Science and Technology Key Laboratory of Database and Parallel Computing of Heilongjiang Province Heilongjiang University Harbin China

ISBN: (纸本)9781424455386

Collaborative filtering techniques are widely used in e-commerce systems. However, the rating data are very sparse, which affects prediction accuracy greatly. A time division based collaborative filtering algorithm is proposed in this paper. According to the current time and the released time of items, items are divided into three types, named new item, normal item and old item respectively. Accordingly, users' interests are calculated in the three types respectively and user-item matrix is expanded. When predicting the rate of an item for a user, different strategies are used with different types of items. Data sparsity and new item problems are solved effectively. Empirical studies on MovieLens have shown that our newly proposed method improve recommendation quality obviously. © 2010 IEEE.

关键词： Collaborative filtering

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Literature recommendation based on reference graph

Literature recommendation based on reference graph

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International Conference on Advanced Computer Theory and Engineering

作者： Yan, Yang Long, Yun Key Laboratory of Database and Parallel Computing of Heilongjiang Province Department of Computer Science and Technology Heilongjiang University Harbin China

ISBN: (纸本)9781424465408

Research papers are frequently requested in digital library. When users query for documents about a research problem, users usually want all the related documents and the citations with the relations among them, to enable the user know the development of the research area. Traditional recommendation techniques are mainly based on similarity among users or documents to do recommendation. They do not use the relationships among documents and, especially, cannot provide topology structure of related documents to the user. This paper proposes a new recommendation technique based on reference graph of documents. Combined with traditional recommendation techniques, it can recommend research paper more completely, accurately and clearly. Experimental results show that the reference graph based recommendation technique is more effective. © 2010 IEEE.

关键词： Digital libraries

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OMA: A multi-channel MAC protocol with opportunistic media access in wireless sensor networks

OMA: A multi-channel MAC protocol with opportunistic media a...

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International Conference on Mobile Ad-hoc and Sensor Networks

作者： Li, Jinbao Zhang, Desheng Guo, Longjiang School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769543154

To tackle control channel saturation problems, this paper proposes OMA, an asynchronous duty cycle based multi-channel MAC protocol with opportunistic media access for wireless sensor networks. By adopting opportunistic media access, OMA effectively alleviates, if not completely eliminates, control channel saturation problems. More importantly, OMA is fully distributed with no requirements of time synchronization or multi-radio. Therefore, OMA is very easy to be implemented in resource-constrained sensor nodes. Via the theoretical analysis, the opportunistic probability with which a node opportunistically access the control channel is obtained. To validate the effectiveness of opportunistic media access, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OMA improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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OCO: A multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks

OCO: A multi-channel MAC protocol with opportunistic coopera...

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International Workshop on Wireless Network Algorithm and Theory

ISBN: (纸本)9780769543222

To handle the triple hidden terminal problems, this paper proposes OCO, an asynchronous multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks. By adopting opportunistic cooperation, OCO effectively alleviates, if not eliminates, the triple hidden terminal problems. More importantly, OCO is fully distributed with no requirements of time synchronization or multi-radio scheme, so it is easy to be implemented on the real sensor nodes. Via the theoretical analysis, the opportunistic probability that a node cooperates with its neighbor is obtained. To validate the effectiveness of opportunistic cooperation, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OCO improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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DCM: A duty cycle based multi-channel MAC protocol for wireless sensor networks

DCM: A duty cycle based multi-channel MAC protocol for wirel...

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IET International Conference on Wireless Sensor Network 2010, IET-WSN 2010

ISBN: (纸本)9781849192392

Limitations of current multi-channel MAC protocols include requiring of strict time synchronization, existing large number of multi-channel hidden terminals, and lacking single-hop broadcast support and sleep mechanism, i.e. duty cycling. This paper proposes an asynchronous duty cycle based multichannel MAC protocol, called DCM, for wireless sensor networks. Instead of requiring time synchronization among nodes, DCM takes advantage of receiver-initiated cross channel handshake mechanism to make a channel reservation for data transmission, and employs receiver adjustment mechanism to tackle the problem of the loss of broadcasting data and to improve broadcast reliability. According to theoretical analysis using Queueing theory, this paper obtains the average number of available channels. The simulation and testbed experimental results show that DCM reduces the number of multi-channel hidden terminals effectively, and achieves significant improvement in network throughput with increasing benefit as traffic loads increase while maintaining higher energy efficiency.

关键词： Wireless sensor networks

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M&M: A multi-channel MAC protocol with multiple channel reservation for wireless sensor networks

M&M: A multi-channel MAC protocol with multiple channel rese...

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery

作者： Li, Jinbao Zhang, Desheng School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769542355

In this paper, a multi-channel MAC protocol, called M&M, with multiple channel reservation is proposed to tackle the channel conflict problem. M&M is fully distributed with no requirements of time synchronization or multi-radio, so it is very practical to implement M&M in resource-constrained sensor nodes. M&M can make nodes to choose one actually idle channel for communications from all assumed idle channels. Therefore, M&M can greatly alleviate, if not completely eliminate, packet collisions resulted by the channel conflict, and thus conserve more energy to prolong the lifetime of WSNs. To investigate the values of multiple channel reservation, extensive simulation and real testbed experiments are conducted. The results show that when the number of channels becomes larger or loads are heavy, M&M improves energy efficiency and throughput significantly. © 2010 IEEE.

关键词： Sensor nodes

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Research on the reliability of MAC protocols for multi-radio sensor networks

Research on the reliability of MAC protocols for multi-radio...

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International Conference on Pervasive Computing, Signal Processing and Applications

作者： Guo, Yahong Zhang, Desheng School of Information Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769541808

In this paper, the concept of multi-radio sensor networks is introduced, and the reliability for multi-radio MAC protocol is researched extensively, via establishing a probability model of reliability. To be specific, the reliability of MAC protocols for multi-radio nodes are studies from single-hop and multi-hop, respectively. Furthermore, the upper and lower bounds of these reliabilities are provided. Lastly, the performance rate between single-radio and multi-radio MAC protocols is proposed. The experiment results show that the reliability of multi-radio MAC protocols is much higher than that of single-radio MAC protocol. In addition, the experiment results roughly coincide with theoretical analysis. © 2010 IEEE.

关键词： Reliability

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M-cube: A duty cycle based multi-channel MAC protocol with multiple channel reservation for WSNs

M-cube: A duty cycle based multi-channel MAC protocol with m...

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16th IEEE International Conference on parallel and Distributed Systems, ICPADS 2010

作者： Li, Jinbao Zhang, Desheng Guo, Longjiang Ji, Shouling Li, Yingshu School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China Department of Computer Science Georgia State University Atlanta GA 30303 United States

ISBN: (纸本)9780769543079

In this paper, a duty cycle based multi-channel MAC protocol with multiple channel reservation, called M-cube, is proposed to tackle the triple hidden terminal problems. M-cube can make nodes to choose one actually idle channel from all the expected idle channels. Therefore, M-cube can avoid data packet collisions resulted by the triple hidden terminal problems. By minimizing the lower bound of the average number of times of channel switching in M-cube, the optimal duty cycle is obtained through theoretical analysis. To validate the effectiveness of multiple channel reservation and dynamic optimal duty cycling, extensive simulations and real test bed experiments were conducted. Both the simulation and experiment results show that when the number of channels is large or network loads are heavy, M-cube improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Energy efficiency

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Notice of Retraction: Collaborative filtering based on time division

Notice of Retraction: Collaborative filtering based on time ...

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International Conference on Computer Science and Information Technology (CSIT)

作者： Yan Yang Long Yun Key Laboratory of Database and Parallel Computing of Heilongjiang Province Department of Computer Science and Technology Heilongjiang University Harbin China

This article has been retracted by the publisher.

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