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Livrables
Following the implementation strategy and the specification of the Physical Layer, three distinct boards (H/W and/or S/W) were used and implemented; two boards for the DCE sub layer (the RF/IF and the Baseband board) and one board for the rest of the PhL service implementation (like power management, mobility control and for configuration purposes). Moreover, the interface between the RFieldbus PhL and the DLL has been implemented in a two-way external connection scheme, which consists of a wired fieldbus data (PhDIS) connection, equivalent with the existence of a Link Station (LS) device, and one wired RS232 management (PhLME) connection.
Verification tests were carried out to validate the performance of the above mentioned radio interface boards.
Based on an existing fieldbus protocol implementation, the specified extensions have been implemented (as a new RFieldbus DLX layer). The fieldbus PC board was extended by an additional control interface (RS232). The fieldbus board driver software is extended to support the new interface.
Based on an existing PROFIBUS protocol implementation, the implementation of the higher layer was carried out. Some parts of Higher Layer functionality are integrated into the board's firmware, while the remaining parts consist of drivers and applications are implemented on a PC platform using Windows NT as an operating system.
The project started with a study of the end-user requirements and the characterization of channel/mobility for flexible industrial automation systems. For this purpose a questionnaire has been prepared. Summarising the extraction of the questionnaire responses and the face-to-face interviews and taking account of the knowledge of today¿s industrial communication structures, 18 basic requirements, to be met by the RFieldbus, have been formulated (fixed in D1.1).
In order to obtain more detailed requirements for the radio interface, the propagation path characteristics (at 1,3 and 2,45 GHz) in different industrial sites were investigated. Propagation measurements focus on identifying both long-term fading and short-term fading parameters, which are: average path loss (or signal attenuation), average delay and RMS delay spread.
So as to be able to select a radio technology appropriate to the requirements of the RFieldbus, seven radio technologies, which seem to have the potential to satisfy some of these requirements, have been assessed : DECT/ DPRS, Bluetooth, HIPERLAN2, HIPERLAN1, UMTS and 802.11b. In order to get a feeling of the existing market in the candidate technologies, a thorough investigation was undertaken during which more than 40 manufacturers were contacted. As a result of the technology assessment and the market scan, a comparison table was generated which, thereafter, was used to focus on the three most promising technologies UMTS, HIPERLAN2 and 802.11b.
A patent was applied by SIEMENS covering the mobility concept of the RFieldbus. It describes the real time hand-off (hand over) algorithm in a network comprising of at least two radio domains (cells). This patent application is a result of the RFieldbus project.
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