Application of QXDM and field diagnostic tools for root cause analysis in volte call failures and QOE degradation

The growing use of Voice over LTE (VoLTE) as the key voice service in LTE and transitional 5G needs the creation of strong test structures to cope with the challenges of unreliable call completion and compromise of Quality of Experience (QOE), which continues to grow. It is the review that examines the usability aspect of Qualcomm extensible Diagnostic Monitor (QXDM), field diagnostic tools, like TEMS Investigation, Accuser XCAL, and Nemo Outdoor, in identifying root causes. Examples of real-world measurement campaigns, experimental results, comparisons of diagnostic tools, and analysis of protocol-layer failures are part of the analysis. A hypothetical diagnosis model will be offered, which proves to have an advantage of multi-tool integration, cross-layer anomaly detection. Other key performance degrading aspects identified in the study include signal degradation due to codec adaptation, inter-RAT, handovers, and protocol misconfiguration. Lastly, the paper notes future research avenues, in which the focus is placed on the implementation of AI-based diagnostics, the Vorna adaptation, and the standardization of diagnostic architectures.