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33rd Chinese Control and Decision Conference (CCDC)

作者： Lei, Yang Huang, Zhiling Cen, Ming Chongqing Univ Posts & Telecommun Sch Automat Chongqing 400065 Peoples R China

ISBN: (纸本)9781665440899

The intelligent vehicle anti-collision system can effectively slow down or avoid the occurrence of traffic accidents and improve the driving safety of the vehicle. The time to collision (TTC) algorithm is not sufficient in anti-collision algorithm when the accuracy characteristics of different sensors are ignored. Therefore, this paper proposes an improved TTC threshold calculation method considering the influence of sensor detection error. In view of the influence of sensor detection error, a TTC probability model is constructed. In this model, the host vehicle (HV) speed, the target vehicle (TV) speed and the relative distance between them are regarded as a random process, and their distribution functions are established. Subsequently, these parameter distribution functions are used to construct the TTC probability model that approximates the normal distribution by Geary-Hinkley transformation. This model uses the collision probability index to calculate more reasonable TTC threshold. Experimental results were produced and comparative analyses were conducted for different cases. The obtained results confirm the effectiveness of the proposed TTC probability model.

关键词： Intelligent Vehicle anti-collision algorithm TTC Threshold Probability Model

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A Novel Multidimensional Q-Selection with Random Tree for an anti-collision algorithm in RFID Systems

A Novel Multidimensional Q-Selection with Random Tree for an...

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9th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP)

作者： Jin, Xiaofang Zhu, Yun Jin, Libiao Liu, Mengxuan Bai, Yu Commun Univ China Sch Informat Engn Beijing Peoples R China Beijing Univ Chem Technol Sch Automat Beijing Peoples R China

ISBN: (纸本)9780769551203

A reader should identify tags quickly and accurately, so an anti-collision algorithm is an important part in a RFID system. Q-algorithm is a hot topic in anti-collision algorithms. In EPC Global Class-1 Gen-2, parameter Q is adopted to adjust the frame sizes dynamically;in ISO/IEC 18000-6 Type C, Q-algorithm with a parameter C makes reduction of equipment loss by lessening adjustments of Q, but it compromises to the system efficiency. In this paper, a Multidimensional Q-Selection with Random Tree algorithm (MQRT) is proposed. It is a hybrid method of Q-algorithm and deterministic algorithm and can lessen unnecessary adjustments of Q and raise system efficiency. The simulation results show that this algorithm can achieve some improved performances than other previous algorithms.

关键词： RFID System anti-collision algorithm Q-algorithm Multidimensional Q-Selection Random Tree algorithm

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Group Tower Cranes anti-collision algorithm

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International Conference on Mechatronics and Control Engineering (ICMCE 2012)

作者： Chen, Guangzhong Zhang, Bing Yang, Yue Hunan Coll Informat Sch Mech & Elect Engn Changsha 410200 Hunan Peoples R China Cent S Univ Sch Traff & Transportat Engn Changsha 410075 Hunan Peoples R China

ISBN: (纸本)9783037855959

In order to solve tower cranes interference and collision problems in the construction site, the reason of group tower cranes collision in construction site is analyzed in detail and four types of typical tower cranes collision case are summed up. The different kinds of collisions among crane rope, cargo boom and balance arm are concluded and each of the collision is analyzed detailedly. At the same time, anti-collision methods are achieved in order to prevent the collision. The best anti-collision algorithm, confirmed well in practical construction site, is chosen for the different collision case.

关键词： Tower Crane Group Tower Cranes anti-collision algorithm

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Research on A dynamic binary stack anti-collision algorithm

Research on A dynamic binary stack anti-collision algorithm

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2nd International Conference on Applied Mechanics, Materials and Manufacturing (ICAMMM 2012)

作者： Yi, Jianjun Luo, Fei Chen, Shaoli Ji, Baiyang Yan, Haixu East China Univ Sci & Technol Shanghai 200237 Peoples R China Sunyard Sys Engn Co Ltd Hangzhou 310053 Peoples R China

ISBN: (纸本)9783037855799

RFID anti-collision technology is one of a key technology in RFID application system. anti-collision algorithms for RFID systems include tag anti-collision algorithms and reader anti-collision algorithms. This paper focused on the impoved binary algorithm and dynamic binary algorithm. An improved algorithm has been proposed, in which the collision bits was put into the stack and they were used as the reader's request. Based on this mechanism, a novel binary stack algorithm has been proposed. Its simulation was given to analyze the performance of this algorithm. The simulation results showed that the amount of transmitted data in proposed algorithm was obviously less than those in the other two traditional algorithms with the number of tags and their bytes increasing. Consequently, the performance of the proposed algorithm is much better than that of the traditional anti-collision binary algorithm.

关键词： RFID anti-collision algorithm binary algorithm dynamic binary algorithm stack

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A Sequential Reading Strategy to Improve the Performance of RFID anti-collision algorithm in Dense Tag Environments

A Sequential Reading Strategy to Improve the Performance of ...

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5th International Conference on Ubiquitous and Future Networks (ICUFN)

作者： Dhakal, Sunil Shin, Seokjoo Chosun Univ Dept Comp Engn Kwangju South Korea

ISBN: (纸本)9781467359900

In general, RFID system consists of a reader and number of tags (embedded in the objects to track them). During the identification process, invoked by the reader to collect the tags' information, multiple tags transmit their information (or IDs) using a shared wireless channel. If multiple tags have concurrent transmissions then the reader perceives it as a collision. The frequency of collision increases when the number of tags inside the identification zone increases, in result the performance of the system degrades heavily in terms of identification efficiency. One of the commonly adopted anti-collision algorithm is Frame slotted Aloha (FSA) which has been standardized in EPC Global G2. This algorithm attempts to adjust the frame size with estimated number of tags and shows good performance results when the number of tags to identify is small. However, due to unknown tag population, the allocation of suitable frame size becomes unreliable for large set of tags. In this paper we propose a Sector and Power based Grouping (SPG) algorithm that confines the tags within the interrogation zone in small groups. The identification process for each group is then operated sequentially. Indeed, grouping of large set of tags highly decreases the collision ratio and further allows us to allocate a reliable frame size which substantially increases the efficiency of the system.

关键词： RFID system anti-collision algorithm Frame Slotted Aloha Tag Grouping

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A collision-aware mobile tag reading algorithm for RFID-based vehicle localization

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COMPUTER NETWORKS 2021年 199卷

作者： Qin, Hua Chen, Weihong Chen, Weimin Li, Ni Zeng, Min Peng, Yang Hunan City Univ Coll Informat & Elect Engn Yiyang Hunan Peoples R China Univ Washington Bothell Div Comp & Software Syst Bothell WA USA

With the development of radio frequency identification (RFID) technology, RFID systems on roads (RSR) have recently been put forward to localize not only manned vehicles but also autonomous vehicles. In such an RFID-based localization infrastructure, passive RFID tags with road-related information are deployed on road surfaces, and any vehicle equipped with an RFID reader can interrogate the tags to obtain its locations. However, like traditional RFID systems, reader collisions could occur when many vehicles (readers) continuously move in and out of a tag's reading range, significantly degrading tag reading performance. Although many anti-collision algorithms have been devised to improve tag reading efficiency, none can be applied in highly mobile and dynamic road environments. In this paper, we propose an adaptive mobile tag reading algorithm, which can effectively reduce reader collisions and improve tag reading efficiency for reliable vehicle localization under various traffic scenarios. Extensive simulation and experiment have verified the feasibility and the effectiveness of our proposed scheme. Particularly, the field tests demonstrate that, with moderate vehicle density and sparsely deployed tags, our proposed algorithm can satisfy the tag reading requirements specified by the upper-layer localization system with a probability as high as 0.976.

关键词： anti-collision algorithm RFID system Tag identification Tag reading Vehicle localization

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Probability Model of Time to collision Considering Sensor Accuracy

Probability Model of Time to Collision Considering Sensor Ac...

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第33届中国控制与决策会议

作者： Yang Lei Zhiling Huang Ming Cen School of Automation Chongqing University of Posts and Telecommunications

The intelligent vehicle anti-collision system can effectively slow down or avoid the occurrence of traffic accidents and improve the driving safety of the *** time to collision(TTC) algorithm is not sufficient in anti-collision algorithm when the accuracy characteristics of different sensors are ***,this paper proposes an improved TTC threshold calculation method considering the influence of sensor detection *** view of the influence of sensor detection error,a TTC probability model is *** this model,the host vehicle(HV) speed,the target vehicle(TV) speed and the relative distance between them are regarded as a random process,and their distribution functions are ***,these parameter distribution functions are used to construct the TTC probability model that approximates the normal distribution by Geary-Hinkley *** model uses the collision probability index to calculate more reasonable TTC *** results were produced and comparative analyses were conducted for different *** obtained results confirm the effectiveness of the proposed TTC probability model.

关键词： Intelligent Vehicle anti-collision algorithm TTC Threshold Probability Model

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The Scheme Design of RFID anti-collision in Mobile Tag Environment 6th

The Scheme Design of RFID Anti-collision in Mobile Tag Envir...

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6th International Conference on Communications, Signal Processing, and Systems (ICCSPS)

作者： He, Xuan Li, Shizhong Wang, Hongjun Yuan, Quan Elect Engn Inst Hefei 230037 Anhui Peoples R China TH Ctr China Beijing 102102 Peoples R China

ISBN: (纸本)9789811065712;9789811065705

Due to collision and mobile problems, it is difficult to use a single reader to identify a large number of mobile tags successfully. In this paper, a new anti-collision scheme is proposed, which combines the tag anti-collision algorithm and multiple reader deployment to solve the mobile tag collision problem. This scheme adopts grouped dynamic frame slotted ALOHA algorithm based on CDMA to deal with the collision which is caused by that large amounts of tags response to the reader. And it adopts the power control algorithm based on cellular model to deal with the collision between the readers. The simulation results show that the total number of slots needed by the tag anti-collision algorithm is less than other similar algorithms;the cumulative adjustment times of reader anti-collision algorithm are less than other similar algorithms, and the algorithm is more stability. It has certain application value in practical engineering.

关键词： Radio frequency identification Mobile tag anti-collision algorithm Power control Cellular model

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An anti-collision algorithm for localization of multiple chirp-spread-spectrum nodes

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EXPERT SYSTEMS WITH APPLICATIONS 2012年第10期39卷 8690-8697页

作者： Cho, Hyeonwoo Kim, Sang Woo Pohang Univ Sci & Technol Div Elect Engn Pohang 790784 Gyungbuk South Korea

This paper develops an anti-collision algorithm for localization of multiple chirp-spread-spectrum (CSS) tag nodes. The CSS is a physical layer defined in IEEE 802.15.4a, and can be used for ranging between two CSS nodes. This ranging operation involves measuring the time-of-flight of the chirp-modulated signal. If anchor CSS nodes are installed at the known positions, a tag CSS node can calculate its coordinate based on the distances between these nodes. When there are multiple tag nodes, however, the tag nodes can fail to calculate their locations because their ranging signals collide with each other. Although the CSMA/CA is adopted for the medium access control protocol of IEEE 802.15.4a, it is not suitable for localization because a tag node must measure at least three successive distances for two-dimensional localization. The proposed algorithm uses a back-off time to prevent collisions, and all tag nodes compete to acquire the authority to use a channel. The proposed algorithm uses two special packets to synchronize the tag nodes for localization. For a theoretical evaluation of the proposed algorithm, the probability of the channel occupation of each tag node is analyzed. Through experiments, the performance of the anti-collision algorithm is verified. (c) 2012 Elsevier Ltd. All rights reserved.

关键词： Chirp-spread-spectrum IEEE 802.15.4a Localization Multiple nodes anti-collision algorithm

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Low Access Delay anti-collision algorithm for Readers in Passive RFID Systems

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WIRELESS PERSONAL COMMUNICATIONS 2012年第1期64卷 169-183页

作者： Galiotto, Carlo Marchetti, Nicola Prasad, Neeli Prasad, Ramjee Aalborg Univ CTIF Aalborg Denmark

Even though radio frequency identification (RFID) systems are spreading more and more as a medium for identification, location and tracking purposes, some reliability issues of these systems still need to be solved. In fact, RFID readers and tags experience collisions when sharing the wireless transmission channel over the same area. In this work, we propose a centralized scheduling-based algorithm as possible candidate solution for the reader collision problem in passive RFID systems. This algorithm has been designed taking into account the circuitry limitations of the tags, which do not allow the usage of frequency or code division multiple access schemes in passive RFID systems. The solution herewith proposed, which is suitable for those scenarios involving static or low mobility readers, aims at preventing reader collisions and provides at the same time low channel access delay to the readers. The performance of this algorithm has been tested via computer simulations. The results show that the proposed solution strongly reduces collision occurrences and, especially in static scenarios, provides low access delay to the readers during the channel contention phase.

关键词： RFID anti-collision algorithm Reader Scheduling Channel access delay collision avoidance

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