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Author Topic: Why can't we store wi-fi signals?  (Read 852 times)

Offline Rakesh reddy

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Why can't we store wi-fi signals?
« on: 31/12/2015 02:15:58 »
why can't we store wi-fi signals in a device and why can't we reuse it whenever we need and where internet is not available
« Last Edit: 31/12/2015 08:42:40 by chris »


 

Offline evan_au

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Re: why cant we store wi-fi signals
« Reply #1 on: 31/12/2015 04:43:09 »
WiFi is a "data pipe" (or, in more technical terms, a "communication channel").
It passes information from your computer to the internet, and back again.

It is no good taking the WiFi pipe with you, if there is no internet tap to connect it to.
 

Offline evan_au

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Re: Why can't we store wi-fi signals?
« Reply #2 on: 01/01/2016 08:17:05 »
The internet is also a communication pipe, allowing applications on your computer (or "Apps" on your mobile phone) to communicate with centralized applications which may be anywhere in the world.

There are some things that applications can do to present the data that you want, where you want, when you want (even when the internet is not available):
- Applications like email can have a component that is resident on your computer. When a WiFi connection is available, any new emails are downloaded, for you to read later. If you respond to some emails, they will be sent immediately, or held and sent later if the internet is not currently available.
- If you regularly monitor certain content like podcasts, a podcast app can check the internet a couple of times per day, and download the podcasts to which you have subscribed, to listen later.
- TV shows can be handled the same way.
- Web sites that you visit regularly can be "cached" locally on your computer
- In principle, some social media apps like Facebook and Twitter could be cached locally for people whose posts you regularly read, with some loss of interactivity and timeliness.

There are certain applications where it is not so clear how they could be used "offline", such as Google Search, since it is not easy for Google to predict what searches you will do tomorrow (apart from the historical trend that you will sometimes repeat tomorrow a search that you made today, and the "old" copy could be reloaded from a local cache if the internet is not currently available).

Your home WiFi is not the only way to access the internet:
- You can get a USB stick that accesses the internet via a mobile cellular network. Cell networks often have a much larger range than the 30m or so of WiFi (but also usually higher costs)
- At home you can use a wired internet connection on a laptop computer. However, most mobile phones don't support a wired Ethernet connection (but they may support a USB connection via another computer)
- Some telephone companies will let the public access the internet via other people's WiFi connection. This is like creating millions of new WiFi connection points.
- In a few years time, there will be an increasing number of "LiFi" connection points, accessing the internet via indoors LED lighting.

In the end, what matters is not so much access to WiFi itself, but access to the information that you were intending to retrieve over the internet.
 

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Re: Why can't we store wi-fi signals?
« Reply #2 on: 01/01/2016 08:17:05 »

 

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