Showing papers by "Marko Hännikäinen published in 2004"
01 Aug 2004
TL;DR: The design and implementation of an IEEE 1588 PC software prototype for Wireless LANs (WLAN) is presented and accuracy is improved using two new developed methods for outbound latency estimation.
Abstract: IEEE 1588 is a new standard for precise clock synchronization for networked measurement and control systems in LAN environment. This paper presents the design and implementation of an IEEE 1588 PC software prototype for Wireless LANs (WLAN). Accuracy is improved using two new developed methods for outbound latency estimation. In addition, an algorithm for adjusting the local clock is presented. The achieved accuracy is measured and compared between WLAN and fixed LAN environments. The results show that 2.8 μs average clock offset can be reached on WLAN, while wired Ethernet connection enables 2.5 μs.
34 citations
05 Sep 2004
TL;DR: This paper evaluating the suitability of the new Unified Modelling Language (UML) 2.0 for the design and implementation of embedded wireless local area network (WLAN) protocols found adequate performance for the protocol with time-critical functionality on the target platform.
Abstract: This paper evaluates the suitability of the new Unified Modelling Language (UML) 2.0 for the design and implementation of embedded wireless local area network (WLAN) protocols. UML 2.0 introduces several new features and improvements to semantics, diagram types, and notations of the language. Behaviour in UML 2.0 can be described accurately and precisely, which enables automatic source code (C/C++ for example) generation for creating executable models. A medium access control (MAC) protocol called TUTMAC was designed and implemented with UML 2.0, and integrated into a hardware platform. The implementation with UML 2.0 reached adequate performance for the protocol with time-critical functionality on the target platform.
12 citations
01 Aug 2004
TL;DR: The design and prototype implementation of a manageable WLAN Access Point (mAP) that can be easily extended by adding new management functions and automated services is presented.
Abstract: This paper presents the design and prototype implementation of a manageable WLAN Access Point (mAP). mAP has been developed for managing WLAN Quality of Service (QoS), frequency selection, client configuration, and for collecting a wide range of management information. The prototype is implemented using a Linux platform. With the presented architecture, the mAP functionality can be easily extended by adding new management functions and automated services.
2 citations
26 Sep 2004
TL;DR: The paper describes a user interface (UI) development, TUTPIS, which is a passenger information system being developed at Tampere University of Technology, which has been modifiability, reusability and support for different terminal types.
Abstract: The paper describes a user interface (UI) development, TUTPIS, which is a passenger information system being developed at Tampere University of Technology. The developed UI and its services are targeted for bus operators. The main design objectives have been modifiability, reusability and support for different terminal types. The support for different terminal types is taken into the TUTPIS UI design by introducing a Web-based report architecture, where reports are composed of generic UI components. The abstract factory design pattern is used to provide the possibility of using the same reports independently of the selected presentation technology.