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Correction

Correction: Suwannapong, C. et al. Congestion Control in CoAP Observe Group Communication. Sensors 2019, 19, 3433

Department of Computer Engineering, Faculty of Engineering, Khon Kaen University, 40002 Khon Kaen, Thailand
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4387; https://doi.org/10.3390/s19204387
Submission received: 4 September 2019 / Accepted: 6 September 2019 / Published: 11 October 2019
(This article belongs to the Section Sensor Networks)
The authors wish to make the following corrections to this paper [1]:
We have found two inadvertent errors in our paper published in this Sensors [1]:
1. In Section 3. of this paper [1], the sentence “Moreover, in each retransmission, the FPB (i.e., Fibonacci fib n, n = {1, 2, 3, 5}) was multiplied by the RTOprevious to determine the new RTO timer for the next retransmission.” This sentence should be modified to state: “Moreover, in each retransmission, the FPB (i.e., Fibonacci fib n, n = {1, 2, 3, 5}) was multiplied by the RTOinit to determine the new RTO timer for the next retransmission.”
2. In Section 3. of this paper [1], the following Algorithm 1 should be replaced with the Algorithm shown below it.
Algorithm 1. Fibonacci Pre-Increment Backoff
Initialize random value from [2 s, 4 s] to RTOinit
Initialize Fibonacci to [1, 2, 3, 5]
when transmitting CON
 RTO = RTOinit
for i = 0 to (size of Fibonacci)-1
   RTOprevious = RTO
   if RTO expires without having received an ACK = RTO
     RTO = RTOprevious * Fibonacci[i]
     i = i+1
   else
 return transmission success
return transmission fail
endfor
Algorithm 1. Fibonacci Pre-Increment Backoff
Initialize random value from [2 s, 4 s] to RTOinit
Initialize Fibonacci to [1, 2, 3, 5]
when transmitting CON
 RTO = RTOinit
for i = 0 to (size of Fibonacci)-1
   if RTO expires without having received an ACK
     RTO = RTOinit * Fibonacci[i]
     i = i+1
   else
     return transmission success
  endfor
return transmission fail
The changes do not affect the scientific results. The manuscript will be updated, and the original will remain online on the article webpage, with a reference to this Correction. The authors would like to apologize for any inconvenience caused to the readers by these changes.

Reference

  1. Suwannapong, C.; Khunboa, C. Congestion Control in CoAP Observe Group Communication. Sensors 2019, 19, 3433. [Google Scholar] [CrossRef] [PubMed]

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MDPI and ACS Style

Suwannapong, C.; Khunboa, C. Correction: Suwannapong, C. et al. Congestion Control in CoAP Observe Group Communication. Sensors 2019, 19, 3433. Sensors 2019, 19, 4387. https://doi.org/10.3390/s19204387

AMA Style

Suwannapong C, Khunboa C. Correction: Suwannapong, C. et al. Congestion Control in CoAP Observe Group Communication. Sensors 2019, 19, 3433. Sensors. 2019; 19(20):4387. https://doi.org/10.3390/s19204387

Chicago/Turabian Style

Suwannapong, Chanwit, and Chatchai Khunboa. 2019. "Correction: Suwannapong, C. et al. Congestion Control in CoAP Observe Group Communication. Sensors 2019, 19, 3433" Sensors 19, no. 20: 4387. https://doi.org/10.3390/s19204387

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