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2016 IEEE 22nd International Conference on Parallel and Distributed Systems (ICPADS) (2016)
Wuhan, Hubei, China
Dec. 13, 2016 to Dec. 16, 2016
ISSN: 1521-9097
ISBN: 978-1-5090-4457-3
pp: 1163-1168
As the domain of cyber-physical systems continues to grow, an increasing number of tightly-coupled distributed applications will be implemented on top of wireless networking technologies. Some of these applications, including collaborative robotic teams, work in a coordinated fashion, whereby a distinguished node takes control decisions and sends commands to other nodes, which in turn perform the requested action/operation and send back a reply/acknowledgment. The implementation of such interactions via reliable point-to-point flows may lead to a significant performance degradation due to collisions, especially when the system operates close to the capacity of the communication channel. We propose a coordinated protocol which exploits the broadcast nature of the wireless medium in order to support this application-level interaction with a minimal number of message transmissions and predictable latency. The protocol also comes with group management functionality, allowing new processes to join and existing processes to leave the group in a controlled way. We evaluate a prototype implementation over WiFi, using a simulated setup as well as a physical testbed. Our results show that the proposed protocol can achieve significantly better performance compared to point-to-point approaches, and remains fully predictable and dependable even when operating close to the wireless channel capacity.
Protocols, Wireless communication, IEEE 802.11 Standard, Reliability, Process control, Throughput, Ad hoc networks

M. Koutsoubelias and S. Lalis, "Coordinated Broadcast-Based Request-Reply and Group Management for Tightly-Coupled Wireless Systems," 2016 IEEE 22nd International Conference on Parallel and Distributed Systems (ICPADS), Wuhan, Hubei, China, 2016, pp. 1163-1168.
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