IEDC-2010 Conference Proceedings (Download ... - NED University

Figure 4. DDCS as a distributed toolset handling multiple concurrent connections
4. Method of Evaluation
Figure 5. Web service consumption in DDCS environment
For the purpose of the setup for evaluation, minimum amount of data was initially programmed to be
transmitted from remote locations using GPRS scheme as shown in Fig 6. The equipment used for
collecting vehicle data from the roadside was TDC‘s EMU® (TDC Systems Limited 2005). EMU® was
programmed using AT command set (Siemens Co, 2005) to utilise GPRS scheme for vehicle data
transmission using Siemens MC55 Modem. Siemens MC55 Modem offered the tri-band Class B
functionality (i.e. GPRS and GSM, one at a time service) up to multi-slot class 10 data transfer speed (i.e.
16-24 kbps data upload and 32-48 kbps data download maximum) (Bettstetter et al., 1999). The
maximum size for each vehicle data was 10 bytes and the maximum packet size for transmission using
MC55 modem was limited to 1500 bytes. This data was scheduled to the transmission interval of 1
minute i.e. up to 1500 bytes could be transmitted every 1 minute (equivalent of approximately 150 vehicle
traffic data records).
Proceedings of IEDC 2010, 1-3 July, 2010
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IEDC-4352-113