Monday, June 19, 2017
Week 3 Status: Red = completed test locations, Blue = soon-to-be-tested
Coming into Week 4 of Spring 2017 mobile field testing, our drivers have compiled a large collection of memorable photos. Follow them on Instagram at: cpuc_broadband_testing
Here is a sample of some of their work.
Monday, June 12, 2017
I traveled to Montpellier France three weeks ago and bought a prepaid SIM from SFR (France's #2 mobile carrier) for my unlocked iPhone. Montpellier is France's fastest growing city and its 8th largest. Here are the speed test results from CalSPEED from a test I ran near the Place de la Comedie, pictured below.
As we saw with 3G/HSDPA technology in California, ping times were long, between 342 and 347 milliseconds, and hampered real-time streaming capabilities. Granted, my phone was pinging servers on the east and west coasts of the United States, but if I were using LTE instead of 3G, I would expect the ping times to be in the range of 150-200 milliseconds for CalSPEED.
This was my first time using a prepaid SIM from a local carrier, and, not knowing how much data to buy in advance, I bought 20 gigabytes. I thought that would be fine for two and a half weeks of exploring the Languedoc area. To my surprise, by the end of my stay I had only used just over 1 gigabyte, and that was with heavy daily usage. Rather than data, it was battery life that ended up being the limiting factor.
Montpellier has a large student population and there are many new cafes catering to them. Pictured below is a sandwich board written in English, tongue-in-cheek.
Tuesday, March 14, 2017
We're beta testing a new visualization tool for the California Interactive Broadband Map that displays Rounds 6-10 of our mobile field test data. Below are images from the beta site. The graphics are interactive, so you can select different parts of the charts and drill down to more specifics, such as 1XRTT only (shown below).
Friday, January 13, 2017
Fierce Wireless reported in August last year that T-Mobile was replacing its Binge-On sponsored data service with something called “T-Mobile One.” The new service includes unlimited data. However, as with any unlimited plan, the big question is, “Unlimited data at what speed and quality?” Unlimited data at 2.5G or 3G speeds is akin to washing your automobile with a teacup.
As I blogged last March, T-Mobile’s Binge-On sponsored data plan let you stream music and video from select content providers without incurring extra data charges, but the only way to get HD-quality streaming video was by disabling Binge-On, because T-Mobile throttled video streaming to 480 pixels (also known as “SD” for “standard definition”).
It’s no surprise that the Binge-On successor, T-Mobile One, by default only delivers SD quality video. If you want HD quality (720-1080 pixels), you have to pay $25 extra. The only difference between Binge-On and T-Mobile One seems to be the latter lets you stream any content (not just T-Mobile’s preferred providers), and it costs more. Also, just to make sure “unlimited data” doesn’t give people crazy ideas, T-Mobile limits tethering to 3G speeds and also says they’ll throttle anyone who streams more than 28 gigabytes per month (that’s a lot of data, by the way).
Image: Read the fine print!
Read the fine print: “On all T-Mobile plans, during congestion the top 3% of data users (>28GB/mo.) may notice reduced speeds until next bill cycle. Video typically streams on smartphone/tablet at DVD quality (480p). Tethering at Max 3G speeds. Sales tax and regulatory fees included in monthly service price.”
Here is an updated image of estimated streaming video quality based on the interpolated spring 2016 field test results. The January 2016 blog post showing estimated streaming video quality using 2015 field test data is here.