Abstract
The Internet of Things (IoT) describes a diverse range of technologies to enable a diverse range of applications using diverse platforms for communication. IP-enabled Wireless Sensor Networks (6LoWPAN) are an integral part of IoT realization because of their huge potential for sensing and communication. The provision of Quality of Service (QoS) requirements in IoT is a challenging task because of device heterogeneity in terms of bandwidth, computing and communication capabilities of the diverse set of IoT nodes and networks. The sensor nodes in IoT, e.g., 6LoWPAN, exhibit low battery power, limited bandwidth and extremely constrained computing power. Additionally, these IP-based sensor networks are inherently dynamic in nature due to node failures and mobility. Introduction of modern delay-sensitive applications for such networks has made the QoS provisioning task even harder. In this paper, we present Network-State-Adaptive QoS provision algorithm for 6LoWPAN, which adapts with the changing network state to ensure that QoS requirements are met even with the dynamic network states. It is a policy-based mechanism, which collaborates with the underlying routing protocol to satisfy the QoS requirements specified in the high level policies. It is simple in its implementation yet minimizes the degradation of the best effort traffic at a considerable level. Our implementation results show that our protocol adjusts well in dynamic 6LoWPAN environment where multiple services are competing for available limited resources
Highlights
Wireless sensor networks (WSNs) consist of tiny sensor nodes with highly constrained computation, bandwidth and energy resources
As WSN state changes so dynamically, the solution must be able to adapt as network state change. lowNETSAQ makes sure that minimum Quality of Service (QoS) guarantees are met even when network state changes due to mobility, node failure or external interference
As WSN state changes so dynamically, the QoS provisioning mechanism needs to adapt with the network state changes
Summary
Wireless sensor networks (WSNs) consist of tiny sensor nodes with highly constrained computation, bandwidth and energy resources. The standard enables us to connect these sensor networks with each other and with other IP-networks to maximize the utilization of information which is mainly associated with IP networks This integration is pivotal to allow users to access the services in sensor networks as well as in the IP networks. Neither traditional IPbased QoS provisioning nor Wireless Sensor techniques are directly applicable to these networks. Other IP-based frameworks like IP DiffServ and IntServ are extremely „heavy‟ to be deployed directly on WSNs. Service differentiation could be a viable solution but it requires major adaptation to function reliably in the highly dynamic topologies. We propose a novel QoS provisioning mechanism for 6LoWPAN that provides soft QoS and adapts well with the changing network conditions.
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