A new mobile SIP proxy integration solution to increase scalability in 5G mobile operators

In this paper, a new integrated solution with external Session Initial Protocol (SIP) proxy application to enhance the scalability in mobile network operators is proposed. The integrated Network Function Virtualization (NFV) concept is utilized to support the proposed solution. This maximizes the usage of existing bandwidths by using unlicensed spectrum bandwidth instead of licensed RF spectrum to support a larger number of smartphones and data plans. Several Quality of Service (QoS) metrics are introduced to validate the proposed solution using different voice codecs and are compared to LTE QoS metrics for voice communication to verify that the proposed solution is reliable. As a result, the G 711 u-law voice codec is found to provide the optimum performance.