California Drive Testing - Mobile Broadband
Blog for the CPUC's mobile field testing program
Friday, January 26, 2018
Testing Your Home Internet Connection
For instance, did you know that going to a site on the east coast from your home on the west coast can slow down your speed by more than 50%?
I have Comcast for my home service, and my plan offers up to 75 megabits per second, which is over 18 times faster than what I get at work (more on that later). The tests that ran over last night revealed that when my connection went to a west coast server, I got as high as 92 megabits per second, but when it went to an east coast server, my speed dropped to around 39 megabits per second. Moreover, the difference in round trip time (latency), is huge. West coast latency averaged 17 milliseconds, while east coast latency was in the mid-80s. Generally speaking, if your latency is below 100 milliseconds, your internet service can support real-time streaming services (assuming other factor such as packet loss and jitter are within range).
As you can tell from the DIY-looking box in the image above, we're still alpha testing the home measurement device, and we hope to have production versions available for volunteers by 2Q 2018.
Here's a summary of my results:
Tuesday, June 27, 2017
Spring Field Testing Week 4
We're entering the last week of field testing with only the northern part of Central Valley and Orange County. Average speeds appear to be very similar to those from last fall.
Compare the above speeds to those from last fall's:
The progress map below shows completed locations in red and upcoming in blue.
Monday, June 19, 2017
Spring 2017 Testing - Week 3
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
CalSPEED Testing in France
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
Mobile Field Test Data Gets A Face Lift
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
T-Mobile Latest: A “Fire Chicken?”
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.
Friday, December 2, 2016
Connect America Fund Layer Now Available on CA Interactive BB Map
As a follow up to my November 1 post on AT&T's plans to deploy wireless local loops as part of their obligations under Connect America Fund Phase II (see "Hello Wireless Loops. Goodbye Fiber? Part 2"), the Connect America Fund Phase II eligible areas are now loaded onto the California Interactive Broadband Map. As shown in the legend to the left, four carriers' territories are shown in light blue (AT&T), dark blue (Consolidated), gray (Frontier), and red (Verizon, now also Frontier). To view the areas, go to the map's menu on the right and expand the FCC Data menu. Check the box next to "Connect America Fund Phase II Locations."
|Connect America Fund Phase II Eligible Census Blocks by Carrier|
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