Effect of channel memory on retransmission protocols for low energy wireless data communications

2003 ◽  
Author(s):  
J.D. Choi ◽  
K.M. Wasserman ◽  
W.E. Stark
Keyword(s):  
Low Energy ◽  
Data Communications ◽  
Wireless Data ◽  
Channel Memory ◽  
Retransmission Protocols

Wireless Monitoring and Scheduling System of Urban Water Supply Network

2011 ◽  
Vol 295-297 ◽  
pp. 2442-2445 ◽  
Author(s):  
Ying Yu ◽  
Lu Qin Luo ◽  
Da Yong Lv
Keyword(s):  
Water Supply ◽  
Data Transmission ◽  
Data Communications ◽  
Urban Water ◽  
Supply Network ◽  
Urban Water Supply ◽  
Wireless Data ◽  
Water Supply Network ◽  
Scheduling System ◽  
Wireless Monitoring

Currently, data communications used in the monitoring and scheduling system of urban water supply network can be simply divided into wireless and wired. While the wireless data communications with network flexibility, less investment, easy maintenance, cost-effective advantages. Therefore, the wireless data communications has become a major data transmission in urban water supply scheduling. The wireless transmission of state parameters in urban water supply pipe network was studied in this paper. This paper presents a wireless monitoring and scheduling scheme based on the short message transmission technology in urban water supply network. It introduced the hardware components of the system, and wireless data transmission software.

Lessons Learned for CBTC Data Communications Subsystems Design and Deployment in a “Brown Field” Environment

2017 ◽  
Author(s):  
Michael Fitzmaurice
Keyword(s):  
Lessons Learned ◽  
Data Communications ◽  
Wireless Data ◽  
Transit System ◽  
Field Environment ◽  
Transit Agencies

The data communications subsystem or DCS is an important element of a CBTC system which supports the wired and wireless data communications between a CBTC equipped train and the wayside elements such as zone controllers and the automatic train supervisory (ATS) system. A “brown field” environment (as opposed to “green field” environment) represents an existing transit system that is already in revenue service and is being re-signaled with a new CBTC system. Such an environment typically represent the most challenging deployment for CBTC a system as it must be installed, tested and integrated in such a manner as to not adversely impact the transit agencies’ ongoing revenue service. Usually, one of the first elements of a CBTC system to be designed and deployed is the DCS. This paper will examine some lessons learned related to the DCS design, deployment, testing and commissioning for CBTC projects in a “brown field” environment with a view to improving future CBTC projects.

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