Abstract
The Deterministic and Synchronous Multichannel Extension (DSME) of the IEEE 802.15.4 standard was designed to fulfill the requirements of commercial and industrial applications. DSME overcomes the IEEE 802.15.4 limitation on the maximum number of Guaranteed Time Slots (GTS) in a superframe and it also exploits channel diversity to increase the communication reliability. However, DSME suffers from scalability problems, as its multi-superframe structure does not efficiently handle GTS in networks with a high number of nodes and periodic flows. This paper proposes the enhanceD DSME (D-DSME), which consists of two extensions that improve the DSME scalability and reliability exploiting a GTS within the multi-superframe to accommodate multiple flows or multiple retransmissions of the same flow. The paper describes the proposed extensions and the performance results of both OMNeT simulations and experiments with real devices implementing the D-DSME.
Highlights
A wide range of industrial and automation applications adopt Industrial WirelessSensor Networks (IWSNs) to benefit from the deployment flexibility and the support for a large number of mobile nodes that these networks offer
This improves scalability, as more flows can be scheduled without increasing the multi-superframe size and, without increasing the average delays for the aperiodic messages transmitted in the Contention Access Period (CAP), as the CAP frequency obtained using the D-Deterministic and Synchronous Multichannel Extension (DSME) is higher than or equal to the one in the standard DSME protocol
The results show that when the multi-superframe period is lower than the period of the flows f 2, in this scenario, the D-DSME provides a higher scalability than the standard DSME protocol
Summary
A wide range of industrial and automation applications adopt Industrial Wireless. The first one, named Shareable D-DSME, allows GTSs to be shared among multiple periodic flows when the flow period is longer than the multi-superframe period. This improves scalability, as more flows can be scheduled without increasing the multi-superframe size and, without increasing the average delays for the aperiodic messages transmitted in the CAP, as the CAP frequency obtained using the D-DSME is higher than or equal to the one in the standard DSME protocol. The second extension, named Mirror D-DSME, allows using the same GTSs for both message transmission and retransmissions This feature improves reliability, as a message is retransmitted multiple times.
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