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: Survey of QoS routing protocols in Wireless Multimedia Sensor Networks 
Chapter Title:  Adoption of Ultra Wideband (UWB) Technology. 
1. Abstract of Cited Paper (BIB001):  This chapter discusses the state of the art and the major research challenges in architectures, algorithms, and protocols, for wireless multimedia sensor networks (WMSNs). These are networks of wirelessly interconnected smart devices designed and deployed to retrieve video and audio streams, still images, and scalar sensor data. First, applications and key factors influencing the design of WMSNs are discussed. Then, the existing solutions at the application, transport, network, link, and physical layers of the communication protocol stack are investigated. Finally, fundamental open research issues are discussed and future research trends in this area are outlined. 
2. Abstract of Cited Paper (BIB002):  The emergence of wireless multimedia sensor networks (WMSN) has given birth to several civilian as well as defense applications. Some of the interesting applications employing low cost sensor nodes to manipulate rich multimedia content include traffic monitoring, border surveillance, smart homes, environment and habitat monitoring. Unlike the traditional sensor networks which are aimed at maximizing network lifetime by decreasing energy utilization, the main objective of WMSNs is optimized delivery of multimedia content along with energy efficiency. Multimedia communications in WMSNs, has stringent delay and high bandwidth requirement as compared to scalar data transfer in WSNs. Fulfilling these constraints in resource and energy constrained WMSNs is a huge challenge. In WMSNs, each layer of the protocol stack is responsible and fully involved in providing QoS guarantees. There is a need for new schemes at each layer of the protocol stack- from advanced coding techniques that reduce encoder complexity and achieve maximum compression to dynamic routing and MAC protocols that provide service differentiation and reduce end-to-end latency. In wireless sensor networks, where all layers have dependency on each other, QoS guarantees are possible through the cross layer interaction of different layers. This paper gives an overview of the different existing layered schemes in WMSNs, followed by a discussion on the significance and efficiency gains that can be achieved from cross layer interactions in WMSNs along with the review of the existing cross layer approaches. Finally, we identify the open research issues which have not been adequately addressed so far.

Literature Review:
Based on modulation schemes and considering bandwidth, physical layer technologies are categorized into three groups: narrow band, spread spectrum, and Ultra-Wideband (UWB)  BIB001 . Also, they are categorized based on standard protocols, namely, IEEE 802.15.4 ZigBee, IEEE 802.15.1 Bluetooth, IEEE 802.11 WiFi, and 802.15.3a UWB which is shown in Table 6 . ZigBee is a lightweight, low cost, and low power consumption protocol. It is the most common standard radio protocol used in WSNs. However, ZigBee standard is not suitable for high data rate applications. In addition, Bluetooth and WiFi standard supports higher data rate but with more power consumption. UWB technology supports higher data rate up to 250 Mbps and low power consumption. Thus, it appears that UWB technology can be an ideal choice for short range applications in WMSNs. In addition, with the new characteristics of UWB, location-aware routing protocols can be optimized for better performance. So adoption of UWB technology in WMSNs can be explored further to achieve optimum network performance  BIB003 BIB001 BIB002 .