PMID- 31387304
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200225
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 19
IP  - 15
DP  - 2019 Aug 5
TI  - Congestion Control in CoAP Observe Group Communication.
LID - 10.3390/s19153433 [doi]
LID - 3433
AB  - The Constrained Application Protocol (CoAP) is a simple and lightweight 
      machine-to-machine (M2M) protocol for constrained devices for use in lossy 
      networks which offers a small memory capacity and limited processing. Designed 
      and developed by the Internet Engineering Task Force (IETF), it functions as an 
      application layer protocol and benefits from reliable delivery and simple 
      congestion control. It is implemented for request/response message exchanges over 
      the User Datagram Protocol (UDP) to support the Internet of Things (IoT). CoAP 
      also provides a basic congestion control mechanism. In dealing with its own 
      congestion, it relies on a fixed interval retransmission timeout (RTO) and binary 
      exponential backoff (BEB). However, the default CoAP congestion control is 
      considered to be unable to effectively perform group communication and observe 
      resources, and it cannot handle rapid, frequent requests. This results in buffer 
      overflow and packet loss. To overcome these problems, we proposed a new 
      congestion control mechanism for CoAP Observe Group Communication, namely 
      Congestion Control Random Early Detection (CoCo-RED), consisting of (1) 
      determining and calculating an RTO timer, (2) a Revised Random Early Detection 
      (RevRED) algorithm which has recently been developed and primarily based on the 
      buffer management of TCP congestion control, and (3) a Fibonacci Pre-Increment 
      Backoff (FPB) algorithm which waits for backoff time prior to retransmission. All 
      the aforementioned algorithms were therefore implemented instead of the default 
      CoAP mechanism. In this study, evaluations were carried out regarding the 
      efficiency of the developed CoCo-RED using a Cooja simulator. The congestion 
      control mechanism can quickly handle the changing behaviors of network 
      communication, and thus it prevents the buffer overflow that leads to 
      congestions. The results of our experiments indicate that CoCo-RED can control 
      congestion more effectively than the default CoAP in every condition.
FAU - Suwannapong, Chanwit
AU  - Suwannapong C
AD  - Department of Computer Engineering, Faculty of Engineering, Khon Kaen University, 
      40002 Khon Kaen, Thailand.
FAU - Khunboa, Chatchai
AU  - Khunboa C
AD  - Department of Computer Engineering, Faculty of Engineering, Khon Kaen University, 
      40002 Khon Kaen, Thailand. chatchai@kku.ac.th.
LA  - eng
PT  - Journal Article
DEP - 20190805
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
EIN - Sensors (Basel). 2019 Oct 11;19(20):. PMID: 31614421
PMC - PMC6696228
OTO - NOTNLM
OT  - Constrained Application Protocol
OT  - Internet of Things
OT  - congestion control
OT  - group communication
OT  - observing resource
OT  - wireless sensor networks
COIS- The authors declare no conflict of interest.
EDAT- 2019/08/08 06:00
MHDA- 2019/08/08 06:01
PMCR- 2019/08/01
CRDT- 2019/08/08 06:00
PHST- 2019/06/20 00:00 [received]
PHST- 2019/07/31 00:00 [revised]
PHST- 2019/08/03 00:00 [accepted]
PHST- 2019/08/08 06:00 [entrez]
PHST- 2019/08/08 06:00 [pubmed]
PHST- 2019/08/08 06:01 [medline]
PHST- 2019/08/01 00:00 [pmc-release]
AID - s19153433 [pii]
AID - sensors-19-03433 [pii]
AID - 10.3390/s19153433 [doi]
PST - epublish
SO  - Sensors (Basel). 2019 Aug 5;19(15):3433. doi: 10.3390/s19153433.