December 14, 2021 | Download PDF
The education delivery mechanism is a constantly changing landscape and lately we are seeing more and more of virtual reality-based education and training. And it makes perfect sense. If you can show a third grader the surface of the moon, Saturn’s rings, and Mars’ moon, why would you want them to learn the same thing by reading about it? It’s a faster & better experience, can be interactive, and most importantly it’s a fun way to learn.
Here are a few pictures taken in VR while learning about our solar system. A picture is worth a thousand words, and I think a VR experience is probably worth a million words.
However, VR comes with its own set of challenges and as Network Engineers we will have to address those.
Before we get into the challenges, let’s see where we are coming from with a use case.
In early 2017 I was working for a big school system with over 50,000 students. One of the questions we were asked is how much bandwidth a student will need in order to have a good education delivery experience, with a follow-up question that in order to provide those bandwidths to our students, what technology would we need?
I thought it was a great question for several reasons. One thing I liked about the question is that it did not start with the latest and greatest technology available in market; it started with the user experience. Another thing I liked about the question is that it was based on numbers. I think if you can ask a question in numbers and answer a question in numbers, then you have a better chance of success.
In a nutshell, to answer that question, we asked several counter questions all related to applications used by students, frequency of usage, etc. We came up with a formula that combined all applications and use cases per application and a golden number of 5mpbs of guaranteed bandwidth per user (keeping some future expansion and additional guest devices into consideration), assuming one user is using a single device to access those applications one at a time.
Then, we calculated the total wireless infrastructure needed; the math was not complicated:
20 users per classroom
Device with a single radio capable of 75mbps max
Device requirement 5mbps
Total airtime per device = 6.6%
Total airtime for 20 users = 133%
Total airtime per AP with loss = 80%
Total AP per classroom = 1.6
We ended up putting an AP in every classroom and an AP in hallways between two classrooms and it has continued to serve them well for several years.
Today, unfortunately the application side has won the race by a significant margin compared to the hardware or even the network side. While the wireless endpoints still have single radio and most of them do not even support the latest 802.11AX standards, the applications have become hungrier for bandwidth.
Here is a comparison of average bandwidth consumption between two students learning the same subject, one over a YouTube video and another over YouTube 360 in VR:
With YouTube (4K), the bandwidth consumption was averaging around 2mbps. However, in VR (quality set to auto), it was averaging around 14mbps, 7 times more.
Going back to the network designed in 2017 that I discussed in the beginning, 5mbps of guaranteed bandwidth seemed like enough at the time. That holds true today for the most part for traditional learning, but the data tells us that we will run short by three-fold using the same infrastructure as we move more toward virtual reality-based learning.
Let’s also look at total downloads:
Roughly 6 Gig within a span of an hour of learning in VR compared to roughly 1 Gig traditionally. Below is the breakdown of the application usage and downloads:
Having worked in the State & Local Government and Education (SLED) market for almost a decade now, we take pride in ensuring that we are ahead of the curve when it comes to technical challenges that school systems will potentially face with education delivery. Changes are coming and, although we are several years away from the Metaverse itself, the more virtual and immersive we go, the more ready the networks need to be.
So, what can we do today to address the coming change? Well, there are several things. I’m going to list a few here but there’s an ocean of information out there for you to do your own research as well.
If you can relate to any of the challenges we mentioned above and would like to talk about it, then please reach out to your DSI Account Manager or email firstname.lastname@example.org.
Thank you for reading and we look forward to discussing a new topic in the next newsletter!
Ambuj M. is a Cisco Certified Internetwork Expert (CCIE) and Certified Wireless Network Expert (CWNE) with 15 years of industry experience. He currently works as a Network Solutions Architect for DISYS Solutions Inc. (DSI).