You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: A Survey on the Viability of Confirmed Traffic in a LoRaWAN 
Chapter Title:  D. CRITICAL SITUATIONS 
1. Abstract of Cited Paper (BIB001):  The Internet of Things is one of the hottest topics in communications today, with current revenues of $151B, around 7 billion connected devices, and an unprecedented growth expected for next years. A massive number of sensors and actuators are expected to emerge, requiring new wireless technologies that can extend their battery life and can cover large areas. LoRaWAN is one of the most outstanding technologies which fulfill these demands, attracting the attention of both academia and industry. In this paper, the design of a LoRaWAN testbed to support critical situations, such as emergency scenarios or natural disasters, is proposed. This self-healing LoRaWAN network architecture will provide resilience when part of the equipment in the core network may become faulty. This resilience is achieved by virtualizing and properly orchestrating the different network entities. Different options have been designed and implemented as real prototypes. Based on our performance evaluation, we claim that the usage of microservice orchestration with several replicas of the LoRaWAN network entities and a load balancer produces an almost seamless recovery which makes it a proper solution to recover after a system crash caused by any catastrophic event.

Literature Review:
One area in which the IoT can be of great benefit is during emergency scenarios or natural disasters. Due to its scaling and long-range capabilities, LoRaWAN has started to attract the attention of researchers building networks for these critical situations BIB002 . IoT deployments in these situations will have to share the limited available resources whilst ensuring QoS requirements are met. For the reaction to an event to be effective, information about the event and the environment in which it occurs is key BIB001 . As the situation unfolds, data from different nodes will become more critical than others, and here the use of priority based acknowledgements can be put to use. The emergency services could also make use of a LoRaWAN to enable basic communication  . During disasters, traditional networks are frequently inactive or overwhelmed. Whilst a LoRaWAN does not have the bandwidth capabilities of these networks, it can be used to sent text information and can provide a reliable network.