A QoS Channel Allocation Scheme for Enhancing the Reliability in 6TiSCH Networks
The recent IEEE 802.15.4-2015 standard proposes a number of Medium Access Control (MAC) layer protocols for low-power and lossy networks. The Timeslotted Channel Hopping (TSCH) is one of the proposed MAC operation modes, which take the advantage of channe
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Department of Computer Science, National Taichung University of Education, No. 140, Minsheng Road, West District, Taichung 40306, Taiwan (R.O.C.) {thlee,lchang}@mail.ntcu.edu.tw, [email protected]
Abstract. The recent IEEE 802.15.4-2015 standard proposes a number of Medium Access Control (MAC) layer protocols for low-power and lossy networks. The Timeslotted Channel Hopping (TSCH) is one of the proposed MAC operation modes, which take the advantage of channel hopping to make the transmissions more reliable and deterministic. In TSCH, slotframe is sliced into a timeslots and random channel hopping is used to mitigate the effects of cochannel interference and multipath fading. In this paper, we focus on the issue of random channel hopping in the error-prone wireless channel condition. In this research, a QoS Channel Allocation Scheme (QCAS) is proposed to enhance the reliability of emergency packet transmission in 6TiSCH networks. Based on our simulation results, we have observed that the proposed QCAS can achieve higher reliability of transmission over selected channel to provide higher throughput and higher delivery ratio than the original TSCH. Keywords: IEEE 802.15.4-2015 · 6TiSCH · 6top · TSCH
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Introduction
The wireless sensor technologies are widely used in industrial applications today, such as industrial automation, environmental monitoring, and condition monitoring. These applications require the larger number of low-power wireless sensor devices provides the capability to be monitored and controlled in a wide area. Many industrial wireless sensor networks [1] below to the IEEE 802.15.4-2015 standard [2] and most of them are required for low power consumption and the Internet networking capabilities. In the trend of IP-enabled industrial wireless sensor devices, a new IETF 6TiSCH [3] standard is being proposed at the IETF to enable IPv6 over the TSCH [4] mode of the IEEE802.15.4e standard [5]. 6TiSCH uses a pre-scheduled timeslotted channel hopping sequence, which repeats in time to reduce the influence of co-channel interference. Each channel of timeslot is selected from the sequence. The pair of sending and receiving devices can able to exchange information and acknowledgments during one timeslot. Therefore, if the current timeslot suffers from co-channel interference or multipath fading, the transmission failure probability will decrease in next timeslot since the channel hopping mechanism. Although, TSCH provides increased reliability using channel hopping mechanism. However, the channel suffers from co-channel interference © Springer Science+Business Media Singapore 2018 K.J. Kim and N. Joukov (eds.), Mobile and Wireless Technologies 2017, Lecture Notes in Electrical Engineering 425, DOI 10.1007/978-981-10-5281-1_66
A QoS Channel Allocation Scheme
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or multipath fading still exists in the fixed channel hopping sequence, therefore the link will susceptible to periodic interference. Therefore, we propose a QoS Channel Allo‐ cation Scheme (QCAS) when the communication channel of nodes in IWSN
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