{"title":"A novel divide and conquer approach for resolving ambiguities in wireless localization","authors":"B. P. B. Elwischger, T. Sauter","doi":"10.1109/WFCS.2016.7496518","DOIUrl":"https://doi.org/10.1109/WFCS.2016.7496518","url":null,"abstract":"Localization of wireless nodes is widely used in automation. Time difference of arrival (TDOA)-based schemes have a good trade-off between implementation effort and attainable precision. Calculating the position of the mobile nodes is challenging due to a hyperbolic multilateration problem where the geometry between reference and mobile nodes is often degenerate. For unsuitable initial positions, iterative algorithms can fail, which favors direct methods. Exact direct methods are computationally efficient, but due to geometric ambiguities they can give a valid pair of solutions. In this work, we present a generally applicable divide and conquer approach which resolves these ambiguities and does not require an initial position.","PeriodicalId":413770,"journal":{"name":"2016 IEEE World Conference on Factory Communication Systems (WFCS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125204287","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}
E. Schweissguth, P. Danielis, Christoph Niemann, D. Timmermann
{"title":"Application-aware industrial ethernet based on an SDN-supported TDMA approach","authors":"E. Schweissguth, P. Danielis, Christoph Niemann, D. Timmermann","doi":"10.1109/WFCS.2016.7496496","DOIUrl":"https://doi.org/10.1109/WFCS.2016.7496496","url":null,"abstract":"In industrial automation environments, networks providing a reliable and timely data delivery are required. Fulfilling this need, Industrial Ethernet (IE) systems have established as an important networking technology in many application areas. Although there are several IE solutions on the market, all of these systems have notable drawbacks, like limited scalability or the introduction of a Single Point of Failure (SPoF). Therefore, we propose a novel IE system that is based on Software Defined Networking (SDN). Originally meant for data center and IT networks, the SDN concept offers features like central network management functions and a fine-grained traffic control that allows to support many applications with diverse requirements even in the same network. Thereby, SDN is also perfectly suited for complex automation environments. To guarantee RT data transmission as well as scalability and an efficient resource usage, our IE system uses a Medium Access Control (MAC) scheme that is based on a Time Division Multiple Access (TDMA) mechanism that is extended by simultaneous data transmissions on physically separate links. The enhanced TDMA mechanism is configured by a joint routing and scheduling algorithm that takes application requirements into account. Our theoretical analysis as well as results achieved with a prototype implementation of the system confirm the applicability of our concept in demanding automation environments with applications that require a worst case communication latency below 1 ms.","PeriodicalId":413770,"journal":{"name":"2016 IEEE World Conference on Factory Communication Systems (WFCS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114914328","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}