Abstract
Low-power Wireless Sensor Networks (WSNs) play a key role in realization of the Internet-of-Things (IoT). Among others, Time Slotted Channel Hopping (TSCH) is a Medium Access Control (MAC) operational mode of the IEEE 802.15.4 standard developed for communications in short range IoT networks. TSCH provides high level reliability and predictability by its channel hopping mechanism and time division channel access nature. In many applications, a number of TSCH networks may coexist in the same neighborhood. Several vehicles close to one another, each including a TSCH network for its in-vehicle communications, serve as an example. Since such networks are running independent of one another, they are not expected to be synchronized in time, and they are not scheduled to operate in exclusive frequency channels. This may lead to inter-TSCH interferences deteriorating the reliability of the networks, which is an important requirement for many IoT applications. This paper analyzes the impact of multiple asynchronous TSCH networks on one another. An analytical model is developed that estimates the chance of such interferences, and the expectation of the number of affected TSCH channels when a number of them are in the vicinity of one another. The developed model is verified using extensive simulations and real-world experiments. Also, a scalable and fast multi-TSCH coexistence simulator is developed that is used to get insight about coexistence behaviors of any number of TSCH networks with various configurations.
Highlights
As a major building block of the Internet-of-Things (IoT), a number of low-power wireless devices communicate with one another to sense and deliver sensor data, forming a Wireless Sensor Network (WSN)
This paper aims at analyzing the coexistence of multiple independent Time Slotted Channel Hopping (TSCH) networks taking into account the details of the timeslots’ structure defined by the technology standard, and considering that different TSCH networks may have different settings (e.g., Hopping Sequence List (HSL), timeslot length, data and Ack packet length, etc.)
This paper investigates the impact of coexisting independent asynchronous TSCH networks on one another when they are in the communication range of one another
Summary
As a major building block of the Internet-of-Things (IoT), a number of low-power wireless devices communicate with one another to sense and deliver sensor data, forming a Wireless Sensor Network (WSN). This paper aims at analyzing the coexistence of multiple independent ( asynchronous) TSCH networks taking into account the details of the timeslots’ structure defined by the technology standard, and considering that different TSCH networks may have different settings (e.g., HSL, timeslot length, data and Ack packet length, etc.). Overlaps in both time and frequency channels are modeled and verified by real experiments and Cooja simulations.
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