NDLI: Verification and Implementation of the Protocol Standard in Train Control System

Content Provider	IEEE Xplore Digital Library
Author	Yu Jiang Hehua Zhang Xiaoyu Song Hung, W.N.N. Ming Gu Jiaguang Sun
Copyright Year	2013
Description	Author affiliation: Sch. of Comput. Sci. & Technol., Tsinghua Univ., Beijing, China (Yu Jiang) \|\| Synopsys Inc., Mountain View, CA, USA (Hung, W.N.N.) \|\| Sch. of Software, Tsinghua Univ., Beijing, China (Hehua Zhang; Ming Gu; Jiaguang Sun) \|\| Dept. ECE, Portland State Univ., Portland, OR, USA (Xiaoyu Song)
Abstract	The train control system is a safety-critical embedded system. In this system, all buses and devices share the real time communication protocol, which is described in the standard IEC 61375. Many systems that comply the standard have been implemented and used in the real world railway, however, their safety checking is highly nontrivial. In this paper, we focus on the formal verification and implementation of the protocol described in the standard. The protocol is modeled as a network of timed automata, which are synchronized to describe the procedure of connection establishment and data transmission among vehicles. The stochastic factors such as time delay and packet loss are modeled in the channel module. Afterwards, we abstract some safety critical properties that are important to guarantee the correctness of the protocol. These properties are verified with the model checker Uppaal. Two properties are violated in the verification, and two corresponding bugs in the standard are fixed and proposed to the IEC. In order to prove the bugs we find, we implement two versions of the standard. The first is for the original description of the standard, and the second is for our fixed description. Both versions are tested with the D113 (a widely used general Multifunction Vehicle Bus control system implemented by the Duagon company), and we find that the second version works well, while the first fails. The second version for the fixed protocol is now used in the real world subway.
Starting Page	549
Ending Page	558
File Size	620641
Page Count	10
File Format	PDF
ISBN	9780769549866
ISSN	07303157
DOI	10.1109/COMPSAC.2013.89
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-22
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Automata Standards Receivers Synchronization Clocks Control systems timed automata Train control system real time protocol IEC 61375 formal verification
Content Type	Text
Resource Type	Article
Subject	Computer Science Applications Software

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