BTS is Base trans-receiver station in Mobile communication. It
is the base station which receives signals from mobile station. It
sends the data or signals to the mobiles.
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cellular or mobile 'phones are constantly talking to each other.
The mobile is saying 'here i am' to the base station
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It means Mobile Station ID.
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This is actually the EGSM uplink band. It carries signals "up"
from the mobile station to the base station. EGSM downlink is from
925MHz to 960MHz and carries signals from the base station "down"
to the mobile station.