| 1. |
- Bilstrup, Urban, et al.
(författare)
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An Implementation of a 3-tier Hierarchical Wireless Sensor Network
- 2006
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Ingår i: 2006 IEEE International Conference on Industrial Informatics. - Piscataway, N.J. : IEEE Press. - 0780397002 ; , s. 138-143
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Konferensbidrag (refereegranskat)abstract
- In this paper an implementation of a wireless sensor network is described. The aim with the implementation is to investigate if present design patterns are applicable on wireless sensor networks. A 3-tier model is adopted as a possible candidate for the software as well as for the network architecture. The implemented wireless sensor network consists of a heterogeneous set of hardware devices such as sensors, sensor hubs, beepers, PDAs and connectors. Most of the hardware components are COTS and most of the software is GNU licensed. All these form a 3-tier hierarchical network architecture.
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| 2. |
- Bilstrup, Urban, et al.
(författare)
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The use of clustered wireless multihop networks in industrial settings
- 2007
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Ingår i: ETFA 2007. - Piscataway, NJ : IEEE Press. - 9781424408252 ; , s. 211-218
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Konferensbidrag (refereegranskat)abstract
- This paper suggests a cluster collision avoidance mechanism and a dual transceiver architecture to be used in a clustered wireless multihop network. These two contributions make the clustered wireless multihop network the preferred architecture for future industrial wireless networks. The wireless multihop cluster consists of one master and several slaves, where some of the slaves will act as gateways between different clusters. Frequency hopping spread spectrum is used on a cluster level and to avoid frequency collisions between clusters a "neighbor cluster collision avoidance mechanism" is proposed and evaluated through simulations. To break up the dependence between the clusters, introduced by the gateway nodes, each node is equipped with two transceivers. The paper is concluded with a suggestion to use a clustered wireless multihop network with orthogonal hopping sequences for an industrial setting.
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| 3. |
- Bilstrup, Urban, et al.
(författare)
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Using Dual-Radio Nodes to Enable Quality of Service in a Clustered Wireless Mesh Network
- 2006
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Ingår i: IEEE Conference on Emerging Technologies and Factory Automation, 2006. ETFA '06. - Piscataway, N.J. : IEEE Press. - 0780397584 ; , s. 54-61
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Konferensbidrag (refereegranskat)abstract
- In this paper some well established wireless technologies are merged into a new concept solution for a future industrial wireless mesh network. The suggested clustered wireless mesh network can handle probabilistic quality of service guarantees and is based on a dual-radio node architecture using synchronized frequency hopping spread spectrum Bluetooth radios. The proposed architecture gives a heuristic solution to the inter-cluster scheduling problem of gateway nodes in clustered architectures and breaks up the dependence between the local medium access schedules of adjacent clusters. The dual-radio feature also enables higher network connectivity, implying, for example, that a higher link redundancy can be achieved.
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| 4. |
- Larsson, Tony, et al.
(författare)
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T4 - Telematics for Totally Transparent Transports
- 2005
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Ingår i: 2005 IEEE Intelligent Transportation Systems Conference (ITSC). - New York : IEEE Press. - 0780392159 ; , s. 467-472
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Konferensbidrag (refereegranskat)abstract
- Transports can be made safer, more secure and efficient by help of telemetry and tracking on-line in real time. T4 is a system architecture aimed to support the development of telematic services for transparent tracking and surveillance monitoring of goods transported by different means on a global scale. The main idea is to focus on the transported pallets or parcels instead of the vehicles moving them. To enable rapid response to new customer requirements and to support remote management of field equipment, software implemented services are designed, packaged, deployed and mediated using XML, Java and the OSGi software technology standards.
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| 5. |
- Nilsson, Björn, et al.
(författare)
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Protocols for active RFID - the energy consumption aspect
- 2007
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Ingår i: 2007 Symposium on Industrial Embedded Systems Proceedings. - Piscataway, N.J. : IEEE Press. - 1424408407 ; , s. 41-48
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Konferensbidrag (refereegranskat)abstract
- The use of Radio Frequency Identification systems (RFID) is growing rapidly. Today, mostly “passive” RFID systems are used because no onboard energy source is needed on the transponders. However, “active” RFID technology, with onboard power sources in the transponders, gives a range of opportunities not possible with passive systems. To obtain energy efficiency in an Active RFID system the protocol to be used should be carefully designed with energy optimization in mind. This paper describes how energy consumption can be calculated, to be used in protocol definition, and how evaluation of protocol in this respect can be made. The performance of such a new protocol, in terms of energy efficiency, aggregated throughput, delay, and number of air collisions is evaluated and compared to an existing, commercially available protocol for Active RFID, as well as to the IEEE standard 802.15.4 (used e.g. in the Zigbee mediumaccess layer).
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| 6. |
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| 7. |
- Nilsson, Björn, 1965-, et al.
(författare)
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The Effect of Introducing Carrier Sense in an Active RFID Protocol
- 2007
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Active Radio Frequency Identification (A-RFID) extends the functionality from the predecessor passive RFID trough adding a power source to the transponder device (device used on a product to identify it). This power source enables more advanced functions in the radio interface such as listening (doing a carrier sense) to the radio channel (carrier of data information) finding out if it is unengaged, and free to use. In this paper we study the carrier sense functionality and its effects in lowering the tag energy consumption. Simulation results show that the life time of a tag, in an A-RFID system, using carrier sense is more than doubled compared to one not using carrier sense. The increased lifetime of the tag is due to the lowered energy consumption caused by the improved throughput and the decreased payload delay, which in turn is thanks to using carrier sense and naturally then give a better utilization of the radio channel.
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| 8. |
- Nilsson, Björn, et al.
(författare)
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Towards an Energy Efficient Protocol for Active RFID
- 2006
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Ingår i: International Symposium on Industrial Embedded Systems, 2006. IES '06. - Piscataway, N.J. : IEEE Press. - 142440777X ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- The use of radio frequency identification systems (RFID) is growing rapidly. Today, mostly "passive" RFID systems are used because no onboard energy source is needed on the transponders. However, "active " RFID with onboard power source gives a new range of opportunities not possible with passive systems. To obtain energy efficiency in an active RFID system a protocol should be designed that is optimized with energy in mind. This paper describes the on-going work of defining and evaluating such a protocol. The protocol's performance in terms of energy efficiency, aggregated throughput, delay, and number of air collisions is evaluated and compared to that of the medium-access layer in 802.15.4 Zigbee, and also to a commercially available protocol from Free2move.
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| 9. |
- Uhlemann, Elisabeth, et al.
(författare)
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Wireless Real-Time Communication Using Deadline Dependent Coding
- 2006
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Ingår i: ARTES - A network for Real-Time research and graduate Education in Sweden 1997-2006. - Uppsala : Department of Information Technology, Uppsala university. - 9150618598 ; , s. 239-256
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Bokkapitel (populärvet., debatt m.m.)abstract
- The constant evolution of wireless communication, and all the applications this enables, is rapidly increasing our demands on the performance of communication networks. As the transmission speed increases, entirely new applications and services, like for example video streaming, suddenly becomes interesting for wireless systems as well. The expectations of the general user with respect to performance of wireless applications are guided by the current quality of traditional wireline systems. This naturally implies a considerable challenge when designing wireless communication systems. Many of these new wireless applications are based on packet transmissions and are sub ject to time-critical constraints. The ob jective of the deadline dependent coding (DDC) communication protocol presented here is therefore to develop an efficient and fault tolerant real-time link layer foundation, enabling critical deadline dependent communication over unreliable wireless channels.
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| 10. |
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