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A utility-optimal backoff algorithm for wireless sensor networks

Journal of Central South University 2009年第4期16卷 635-639页

作者：廖盛斌杨宗凯程文青刘威 Department of Electronics and Information Engineering Huazhong University of Science and Technology Engineering and Research Center for Information Technology on Education Huazhong Normal University

A novel backoff algorithm in CSMA/CA-based medium access control (MAC) protocols for clustered sensor networks was proposed. The algorithm requires that all sensor nodes have the same value of contention window (CW) in a cluster, which is revealed by formulating resource allocation as a network utility maximization problem. Then, by maximizing the total network utility with constrains of minimizing collision probability, the optimal value of CW (Wopt) can be computed according to the number of sensor nodes. The new backoff algorithm uses the common optimal value Wopt and leads to fewer collisions than binary exponential backoff algorithm. The simulation results show that the proposed algorithm outperforms standard 802.11 DCF and S-MAC in average collision times, packet delay, total energy consumption, and system throughput.

关键词： wireless sensor networks network utility maximization backoff algorithm collision probability

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A NOVEL PFMAC PROTOCOL FOR WIRELESS SENSOR NETWORK BASED ON PREDICTION AND FEEDBACK METHOD

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Journal of Electronics(China) 2011年第4期28卷 488-495页

作者： LiuYaqiu Bian Li Jing Weipeng Zhang Qianlong Information and Computer Engineering College Northeast Forestry University Harbin 150001 China

In view of the problem that existing Media Access Control(MAC) protocols can not pro-vide real-time monitor on network conditions,this paper puts forward a new MAC protocol- Predict and Feedback MAC(PFMAC) which can predict the channel's congestion level *** dominant idea of the new scheme is to record the channel's busy or idle situation in the backoff stage by sending Sensor Nodes(SNs),and according to the congestion level every SN can change the contention window adaptively when send packets successfully to minimize collisions,saving energy and channel *** result of simulation shows that compared with other MAC protocols,the PFMAC protocol can improve network throughput and reduce energy consumption in high speed network en-vironment.

关键词： Media Access Control(MAC) backoff algorithm Predict and Feedback MAC(PFMAC) Contention window

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Research on Key Technologies of Electronic Shelf Labels Based on LoRa

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Journal on Big Data 2021年第2期3卷 49-63页

作者： Malak Abid Ali Khan Xiaofeng Lian Imran Khan Mirani Li Tan School of Artificial Intelligence Beijing Technology&Business UniversityBeijing100048China School of Automation Beijing Institute of TechnologyBeijing100081China School of Information and Computer Engineering Beijing University of TechnologyBeijing100124China School of Computer Science&Engineering Beijing Technology&Business UniversityBeijing100048China

The demand for Electronic Shelf Labels(ESL),according to the Internet of Things(IoT)paradigm,is expected to grow considerably in the immediate *** wireless communication standards are currently contending to gain an edge over the competition and provide the massive connectivity that will be required by a world in which everyday objects are expected to communicate with each ***-Power Wide-Area Networks(LPWANs)are continuously gaining momentum among these standards,mainly thanks to their ability to provide long-range coverage to devices,exploiting license-free frequency *** main theme of this work is one of the most prominent LPWAN technologies,*** purpose of this research is to provide long-range,less intermediate node,less energy dissipation,and a cheaper ESL *** research has already been done on designing the LoRaWAN network,not capable to make a reliable *** is using different gateways to transmit the same data,collision,data jamming,and data repetition are *** to the transmission behavior of LoRa,50%of data is *** this paper,the Improved backoff algorithm with synchronization technique is used to decrease overlapping and data ***,the improved Adaptive Data Rate algorithm(ADR)avoids the collision in concurrently transmitted data by using different Spreading Factors(SFs).The allocation of SF has the main role in designing LoRa based network to minimize the impact of the intra-interference,cost function,and Euclidean *** this purpose,the K-means machine learning algorithm is used for *** data rate model is using an intra-slicing technique based on Maximum Likelihood Estimation(MLE).The data rate model includes three critical communication slices,High Critical Communication(HCC),Medium Critical Communication(MCC),and Low Critical Communication(LCC),having the specified number of End devices(EDs),payload budget delay,and data ***,different combinations of gateways are

关键词： LoRa electronic shelf labels adaptive data rate backoff algorithm remote Acknowledgment

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