1. The 3rd Generation Partnership Project. (2017, March). 3GPP specification series: TR36.942. http://www.3gpp.org/DynaReport/36-series.htm.
2. Cellular Telecommunications Industry Association. (2016a, June). CTIA annual wireless industry. http://www.ctia.org/industry-data/ctia-annual-wireless-industry-survey.
3. Cellular Telecommunications Industry Association. (2016b). Wireless quick facts. http://www.ctia.org/industry-data/wireless-quick-facts.
4. Ericsson. (2016, June). Ericsson mobility report. https://www.ericsson.com/assets/local/mobility-report/documents/2016/ericsson-mobility-report-june-2016.pdf.