Another theme I loved in the talk were his examples of how people react to radical new inventions. Interestingly they either react with disdain or enthusiasm, nothing else in-between. Perlman's point is people consistently say things can't be done.
And they are wrong. Go do impossible things. It sounds awesome, but when a new technology comes along promising the world you have to be skeptical. Hoping to be proven wrong though!
I have a couple thoughts on it myself:. I'm definitely not a physicist, but surely the combined modulated signals will differ depending on where the receiver user is located in relation to the APs? Would love an explanation. Perhaps inter-service traffic will keep scaling as it is now, but it sounds like they are planning for a future where every user is sitting around consuming crazy large content at the same time.
How many people are simultaneously streaming HD video in one apartment building for example? And on video gaming, it definitely seems like casual gaming i. I take that to mean protected, licensed IP, which sort of trumps the transparency, "open", request. That sounds like a network management issue. I'm guessing DIDO works by having the data center calculate "what must all APs transmit simultaneously such that the waveforms interfere around each client to produce what they are to receive".
Sounds like some math done based on propagation characteristics, distance, and other wireless channel specifics. Wouldn't this need to be re-calculated for change in positions of client? Maybe the data center does this on the fly based on per-transmission signal characteristics of each client.
It seems like they're waiting for a patent grant. Maybe they'll share the details after that. Notify me of follow-up comments via email. Explain the Cloud Like I'm All Time Favorites. Real Life Architectures. Support in Patreon.
Start Here. All Posts. Amazon Store. Recent Posts. Aug 02 Tuesday, August 2, at AM. It's a bold vision, but will it happen? Let's take a look in more detail at the various parts of the vision From the perspective of linking the world's compute resources into one unified application fabric , this is perhaps the most interesting claim: Cellular systems have long range, but have very high latency up to milliseconds or more for 3G.
WiFi systems are fairly low latency a few milliseconds , but are limited in range. There is no inherent reason for long-range wireless networks to be higher latency than wired or fiber networks, but the complex wireless protocols and distribution systems used in multiuser wireless systems add a great deal of latency.
Even LTE 4G incurs 40ms or more of latency Cellular systems have long range, but have very high latency up to milliseconds or more for 3G. Even LTE 4G incurs 40ms or more of latency. Here are some rough notes from the video portion on DIDO: In Shannon up with the data capacity, the number of bits per second, that can be carried on a channel.
This describes the limits on our wireless connections. The problem is we are running out of useable spectrum. Wireless is a shared space, we are all on the same channel. Only a small fraction of users can use the channel. In rural areas, DIDO works at distances up to miles. Whenever there is more than one wireless transmission within range of another, there is potential for interference between them, like when you listen to AM or FM radio while driving.
As you drive out of the range of one station, you start to hear another station that you are approaching. The two stations duel for a time, but at some point you only hear the new station. The stations are spaced out to eliminate interference. With cell phones, the problem of interference gets more complex. With lots of users sending and receiving communications at the same time, each region has to be subdivided into cells, a mile or less in diameter, with cell towers that have different frequencies from adjacent cells so as not to interfere.
A user stays connected as long as they are within range of at least one cell tower. But each cell still has a limited data rate capacity which is shared by all users in that cell.
That results in dropped calls and slow internet connections. Wi-Fi wireless networks are restricted to even shorter ranges because of interference. Approaches such as MIMO, used in In the future, Rearden expects to hit times and possibly even 1, times.
When a user connects a computer to a single Wi-Fi access point, and there are no other users of the spectrum, the connection process is simple and reliable. The user gets percent of the spectrum available, as pictured in the first image to the right. When a user watches a web video, the web site sends video data to the access point, which modulates the data, or creates a wave signal that contains the data.
If the user stays within range of the access point and nothing else happens, then the video plays uninterrupted. But as soon as other devices compete for the same spectrum, the data rate becomes tougher to maintain. If a neighbor next door also has Wi-Fi, and the users are on the same frequency, then the users will see interference if they try to access video at the same time.
By using this website you are consenting to the use of cookies. Electronics Weekly is owned by Metropolis International Group Limited, a member of the Metropolis Group; you can view our privacy and cookies policy here. Home » Blogs » Mannerisms » Wireless. David Manners. Get Electronics Weekly every day Subscribe. How often do you find yourself calling back someone because your call drops out?
The productivity loss and frustration is a real problem which needs a real solution. It is very economical to provide high-speed communication to many customers in a small area, however when talking of rural customers the equations are reversed. Satellite communication is the preferred technology of choice, but it is considerably more expensive, is generally a lower bandwidth solution and subject to poor latency.
The anticipated shortcomings of DIDO technology need not be considered as deal breakers for the technology. The technology still has potential to address real world problems.
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