The document reports on a study that measured mobile broadband speed and quality of service on the Softbank and KDDI networks in Japan. 11 iPhones measured round-trip time, upload/download speeds, and number of hops over 2 hour periods on January 24th and 31st, 2014 from a classroom. Results showed Softbank's network offered faster average speeds but more volatility, while KDDI's network was more consistent. Significant variations over short time periods meant single speed measurements lacked meaning. The number of TCP streams in download tests did not produce significant statistical differences.
3. Test Setting (2/2)
• Our application conducted QoS measurements every 10
minutes for 2 hours.
• 12 measurement windows for each handset.
• In each measurement window
• RTT was measured 150 times at the interval of 0.2 seconds.
• Download/Upload speed was calculated based on throughputs for
10 seconds.
• Upload speed was measured once.
• Download speeds were measured in three different settings:
one on a single TCP stream, the others are on 3 and 5 TCP
streams.
• The number of hops was counted 3 times using “traceroute.”