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New CAP Reduction Mechanisms for IEEE 802.15.4 DSME to Support Fluctuating Traffic in IoT Systems
Publikationstyp
Conference Paper
Date Issued
2020
Sprache
English
Author(s)
Institut
TORE-URI
First published in
Number in series
12338 LNCS
Start Page
159
End Page
179
Citation
19th International Conference on Ad-Hoc Networks and Wireless, ADHOC-NOW: 159-179 (2020)
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
Springer
In 2015, the IEEE 802.15.4 standard was expanded by the Deterministic and Synchronous Multi-Channel Extension (DSME) to increase reliability, scalability and energy-efficiency in industrial applications. The extension offers a TDMA/FDMA-based channel access, where time is divided into two alternating phases, a contention access period (CAP) and a contention free period (CFP). During the CAP, transmission slots can be allocated offering an exclusive access to the shared medium during the CFP. The fraction of CFP’s time slots in a dataframe is a critical value, because it directly influences agility and throughput. A high throughput demands that the CFP is much longer than the CAP, i.e., a high value of tau, because application data is only sent during the CFP. High agility is given if the expected waiting time to send a CAP message is short and that the length of the CAPs are long enough to accommodate necessary GTS negotiations, i.e., a low value of tau. Once DSME is configured according to the needs of an application, tau can only assume one of two values and cannot be changed at run-time. In this paper, we propose two extensions of DSME that allow to adopt tau to the current traffic pattern. We show theoretically and through simulations that the proposed extensions provide a high degree of responsiveness to traffic fluctuations while keeping the throughput high.
DDC Class
004: Informatik