Since SLAs specify the contractual terms that are formally used between consumers and providers, there is a need to aggregate QoS requirements from the perspectives of Clouds, networks, and devices to deliver the promised IoT functionalities. Therefore, the main objective of this chapter is to provide a conceptual model of SLA for the IoT as well as rich vocabularies to describe the QoS and domain-specific configuration parameters of the IoT on an end-to-end basis. We first propose a conceptual model that identifies the main concepts that play a role in specifying end-to-end SLAs. Then, we identify some of the most common QoS metrics and configuration parameters related to each concept. We evaluated the proposed conceptual model using a goal-oriented approach, and the participants in the study reported a high level of satisfaction regarding the proposed conceptual model and its ability to capture main concepts in a general way.

翻译：由于服务等级协议（SLA）规定了消费者与提供者之间正式使用的合同条款，因此有必要从云、网络和设备的角度聚合服务质量（QoS）要求，以实现承诺的物联网功能。因此，本章的主要目标是为物联网提供一个SLA概念模型，并提供丰富的词汇表，以端到端的方式描述物联网的QoS和特定领域配置参数。我们首先提出了一个概念模型，该模型识别了在指定端到端SLA中发挥作用的主要概念。然后，我们识别了与每个概念相关的一些最常见的QoS指标和配置参数。我们使用目标导向的方法评估了所提出的概念模型，研究参与者对所提出的概念模型及其以通用方式捕捉主要概念的能力表示了高度满意。