Does my mobile phone communicate with the base-station tower every now and then?
Sometimes when i leave the mobile phone close to the TV, the TV seems to detect some signal from the mobile phone. What is happening?
Is the mobile phone sending some packets to the basestation or the other way around? What are these packets and why is this communication important?
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Because your phone is close to the TV or monitor, when it transmits, the signal is strong at the TV: that’s why it shows up.
The cell-site -to- phone signals are much weaker at your TV, & so they don’t cause any noticeable effect.
Basically, the network keeps track of where your phone is. Well, which cell it is in, anyway. That way it can ring it, when someone calls you. It would be much less efficient, if whenever someone wanted to ring you, if it had to send the message from every cell site all over the world to find out which one you are in & which one to route the message to. So basically they stay in contact, just to make things easier.
Also, they tend to check on things, like they agree on what channels to use & such things needed to keep the network going efficiently.
All these transactions have names & the packets likewise. If you really want the details, look for the standards for the system you use. I guess from the way you suggest packets that you know some already, but most people would be totally floored by the complexities going on and the maths being done many times a second just to allow what seems simple to talk to a mate.
Hope this helps
Yes, the phone does communicate with the base station tower. This is even used to detect traffic jams (because signals from many phones come from such places)
Digital Mobile Systems have some protocols that lets each phone ‘sense’ every certain time to check which channel are around.
Those techniques are only reception; the mobile phone receive, from time to time, all the possible ‘control channels’.
Cellular phone system divide mobile band in parts that are associated with geographical area. There could be 3, 21, 24 or 12 different area patterns depending on your provider type of system. At any time, if your phone is on, it will registered with a Radio Base A (antenna) trough the associated control channel, but the phone continuously check the other control channel to determine which one has more power and could switch to the one that gives better service. When the mobile phone found a control channel stronger that the one it is in use, the switch, and ask (transmit) to the Radio Base B (another antenna), to be included in B area of service. If Radio Base B has capacity, your phone would be accepted and now will be associated with Radio Base B instead of A, so you are moving and your phone is helping to choose the better antenna.
When you are talking, this measure and procedure is continuously (several times per second), but when the phone ‘rest’ this procedure repeat once in a minute, or three or five minutes, depending on you service provider setup.