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| This is a reminder to guilt me into adding this. I actually have the information, I just need to convert it to a useful format. | Although almost none of you will be able to influence the design of radio systems, understanding the underpinnings of mobile communications can be crucial to assuring your particular application, site or service works correctly. |
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| This is like we have added patterns like hardware keyboard layouts -- most of you cannot influence the design, but understanding the constraints and behaviors helps with your design. Not understanding how mobile cellular telephony works is a problem. | |
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| I've gone out of my way to take RF engineering classes. And it's pretty arduous. Transcoding Walsh codes by pencil, and so on. So I boiled down a couple thousand pages of documents gathered over time into an about 20 page slideshow for internal use. It has no explanations, has bad branding, and half of the images are snagged off the internet. Instead of posting that, I intend to repurpose all the content into a cohesive story and put it all up here as an article, so you can just refer to it when you need to. | *** I've gone out of my way to take RF engineering classes. And it's pretty arduous. Transcoding Walsh codes by pencil, and so on. So I boiled down a couple thousand pages of documents gathered over time into an about 20 page slideshow for internal use. It has no explanations, has bad branding, and half of the images are snagged off the internet. Instead of posting that, I intend to repurpose all the content into a cohesive story and put it all up here as an article, so you can just refer to it when you need to. *** |
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| If you are sad that I haven't yet, bug me about it. Or, if the long, technical courses interested you then I'd suggest where I got most of my training [[http://www.howcdmaworks.com/|Scott Baxter & Associates]]. | |
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== The Electromagnetic Spectrum == == Radio Frequency Spectrum == Radio all operates between X and X == MTS (1946) & IMTS (1963) == When I ask XXX japan, finland, maybe the early 80s. In fact... in-service 1946, all dates here are the first serious date in service, not generally counting trials, or lab tests == Automatic Handoff, Metroliner Experiments (1969) == overlaps cells and sectors diagram == AMPS, TACS, NMT, Netz, et. al. (1983) == == D-AMPS (1990s) == == GSM & GPRS (1991) == == IS-95 CDMA (1995) == == Tacking on Data, 2.5G (2001) == == 3G (2001) == == WiMax & LTE (2009) == ... LTE is becoming the de-facto world standard, and almost every major carrier is signing on. This will perhaps mean another world network (as promised by GSM), and easy roaming in most countries. Practically, there may still be fragmentation, and multiple subsets of LTE, causing issues with travel. The ubiquity of data does not mean that all service will be reliable, or that data roaming costs are likely to disappear or become low enough customers will not care. Continue building services to use data efficiently, and offer functions to warn users on ad hoc and prepaid plans about network usage. |
Although almost none of you will be able to influence the design of radio systems, understanding the underpinnings of mobile communications can be crucial to assuring your particular application, site or service works correctly.
*** I've gone out of my way to take RF engineering classes. And it's pretty arduous. Transcoding Walsh codes by pencil, and so on. So I boiled down a couple thousand pages of documents gathered over time into an about 20 page slideshow for internal use. It has no explanations, has bad branding, and half of the images are snagged off the internet. Instead of posting that, I intend to repurpose all the content into a cohesive story and put it all up here as an article, so you can just refer to it when you need to. ***
The Electromagnetic Spectrum
Radio Frequency Spectrum
Radio all operates between X and X
MTS (1946) & IMTS (1963)
When I ask XXX japan, finland, maybe the early 80s. In fact...
in-service 1946, all dates here are the first serious date in service, not generally counting trials, or lab tests
Automatic Handoff, Metroliner Experiments (1969)
overlaps
cells and sectors diagram
AMPS, TACS, NMT, Netz, et. al. (1983)
D-AMPS (1990s)
GSM & GPRS (1991)
IS-95 CDMA (1995)
Tacking on Data, 2.5G (2001)
3G (2001)
WiMax & LTE (2009)
...
LTE is becoming the de-facto world standard, and almost every major carrier is signing on. This will perhaps mean another world network (as promised by GSM), and easy roaming in most countries.
Practically, there may still be fragmentation, and multiple subsets of LTE, causing issues with travel.
The ubiquity of data does not mean that all service will be reliable, or that data roaming costs are likely to disappear or become low enough customers will not care. Continue building services to use data efficiently, and offer functions to warn users on ad hoc and prepaid plans about network usage.
REFERENCES:
http://www.howcdmaworks.com/ - Lots of stuff made by Scott Baxter & Associates, but not published (you have to take the training) so how to refer to it.
- article in Smithsonian or somewhere on the development, especially of Metroliner experiments, etc.