Appdaptivity: An Internet of Things Device-Decoupled System for Portable Applications in Changing Contexts

Martin, Charles L.; Hoebeke, Jeroen; Rossey, Jen; Díáz, Manuel; Rubio, Bartolomé; Abeele, Floris Van den

doi:10.3390/s18051345

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Generally, there are two communication patterns, both CoAP-based and Observing Resource (Obs), which are considered as one-to-one communication [9]. Since a variety of application domains require data from IoT devices, data communication between a sender and a receiver is essential, contributing to the emergence of group communication [10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Congestion Control in CoAP Observe Group Communication

Suwannapong

Khunboa

2019

Sensors

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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.

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Section: Introductionmentioning

confidence: 99%

Congestion Control in CoAP Observe Group Communication

Suwannapong

Khunboa

2019

Sensors

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“…Amanowicz and Krygier proposed a solution for the expected high traffic in the 6LoWPAN network, called the inter-session network coding mechanism, to reduce the traffic and consequently reduce energy consumption [32]. Another study proposed a framework for IoT system adaptability for application development and implementation, considering the 6LoWPAN mode [33]. [39].…”

Section: Related Workmentioning

confidence: 99%

6LoWPAN Stack Model Configuration for IoT Streaming Data Transmission over CoAP

Aloufi¹

2022

Int. j. commun. netw. inf. secur.

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Different protocols have been developed for the Internet of things (IoT), such as the constrained application protocol (CoAP) for the application layer of the IPv6 over low-power wireless personal area networks (6LoWPAN) stack model. Data transmitted over 6LoWPAN are limited by the throughput and the frame size defined by IEEE 805.14.5 standards. Choosing the best configuration for data transmission involves a trade off between the application requirements, the constrained network configuration, the constrained device specifications and IoT application protocols. This paper provides an analysis of message size and structure recommendations for the 6LoWPAN stack model for different network topologies using CoAP. CoAP is a promising application protocol for the 6LoWPAN stack model because it can effectively manage the transmission required functionality in small header UDP packets compared to TCP packets. However, a data model is also required to realize an effective IoT model. While fragmentation and reassembly are supported by CoAP, they should be avoided for this type of model. As for any conceptual model, a high configuration between layers is mandatory. Additionally, the proposed message format is useful for semantic web of things application development and for WSN design and management.

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