I'm currently learning about rate-based congestion control for industrial wireless sensor network. Suppose there is a network consisting of several sensor nodes and one coordinator node connected in star topology (coordinator as a center of topology). Periodically, sensor nodes will transmit sensing data to the coordinator node.
The algorithm that I'm working on is designed to change the transmission rate of each sensor nodes every time a congestion occur (coordinator receive too many packets within a short time, hence making the receiving buffer overflows). As this algorithm is intended for industrial wireless sensor network, I want to try to combine them with WirelessHart and ISA100.11a protocol. As both protocols are designed over IEEE802.15.4 protocol with Time-Slotted Channel Hopping (TSCH) in its Link Layer, the transmit rate will be dependent on the timeslot size in slotframe. Hence my current conclusion is that: during network operation, if my algorithm wants to change a node's transmit rate, my algorithm must be able to change the TSCH timeslot size. Is it possible to implement my algorithm to TSCH devices currently on market? Is it recommended? Or does my conclusion not correct?
Actually, this link has done it for your network
Article An Enhanced Distributed Congestion Control Method for Classi...
Hi Philip,
You mentioned network congestion in WirelessHART and ISA100.11a, which makes me a bit confused. Normally, congestion happens in wireless sensor networks with CSMA/CA, in which sensors compete to access transmission media and transmit as fast as they like to.
However, in WirelessHART and ISA100.11a, there is a system manager mantaining the whole network. Before transmiting data, each sensor has to request communication bandwidth (time slots) and get the permission from system manager. If there is not sufficient bandwidth (time slots), the request will be rejected and sensors will not transmit data. This scheme prevents network congestion of WirelessHART and ISA100.11a.
Hope it helps!
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