Worldwide interoperability for microwave access (WiMAX), universal mobile telecommunications service (UMTS), and long-term evolution (LTE) are revolutionary technologies for wireless communications. The number of mobile devices has increased due to the tremendous number of laptops and smartphones. These devices use wireless communication. This paper presents a study of WiMAX, UMTS, and LTE. The paper especially compares them from a quality of service (QoS) point of view.

In this paper, Chaari et al. start with a description of the QoS metrics they used, such as delay and packet loss rate. Later, the authors explain the wireless technologies WiMAX, UMTS, and LTE, respectively. They start by giving general information about the architecture of the networks. Then, they list the QoS metrics for every network type. The paper presents the QoS metrics as a table with the metric name, description of the metric, and example of the application.

The authors compare the networks using a table. They compare the networks according to standardization, frequency, bandwidth, modulation, QoS support, peak data rate, UL mobility, and multiplexing coverage. There are also tables for comparative evaluation of each network for video streaming, voice over Internet protocol (VoIP), and video conferencing applications. As expected, LTE outperforms other technologies in many ways. However, other technologies are still being used.

This paper is fairly well written and references a few of the most relevant published works on the topic. The methods presented are interesting applications of QoS, and the authors provide good comparisons. This paper is not intended to--and does not--present a major finding in the application area of wireless networks, but instead presents a survey of the existing technologies.