Answer Posted / praveena

How a Call is made from PSTN to Mobile:

Joe to PSTN:
Hello, this is Joe. I want to talk to Lynn.
PSTN to MSC:
Hello, I have a call for Lynn.
MSC to all base stations:
Calling all base stations. Where is Lynn?
Base station #1: Base Station #2:
Base Station #3:
Is Lynn here? Is Lynn here?
Is Lynn here?
Lynn to station #1:
(loudly) HERE
My ESN is 1123445
My Station Mark is 100 mW
Lynn to station #2:
(softly) Here
My ESN is 1123445
My Station Mark is 100 mW
Base station #1 to MSC:
Lynn is HERE and she is THIS loud.
Her ESN is 1123445
Her Station Mark is 100 mW
Base station #2 to MSC:
Lynn is here and she is this loud.
Her ESN is 1123445
Her Station Mark is 10 mW
MSC (thinking):
Hmm… does Lynn’s ESN match my records.
Yes, it does! From her ESN, I can find her HLR (home
location register) and decide how much to bill her and if
she has any special calling plans or features.
I can bill her 70 cents per minute!
Which base station shall we use? #1 was louder than #2, I
can tell that from her station mark.
MSC to base station #1:
Base station #1, set up a voice channel for Lynn.
Base Station #1 (thinking):
Hmm.. we need a new voice channel for Lynn. Jeremy just
finished using 824 MHz. We will put her there…
Base Station #1 to Lynn:
Lynn, please set your frequency to 824 MHz.
(Lynn’s phone rings.)
Lynn to Base Station #1:
(Lynn picks up the phone) Ok, frequency set to 824
MHz. “Hello?”
Base station #1 to MSC:
Ok, Lynn is ready to receive voice. Here is her
message, “Hello?”
MSC to PSTN:
Ok, Lynn is ready to receive voice. Here is her
message, “Hello?”
PSTN to Joe:
“Hello?”
Joe to PSTN:
“Hello, Lynn, this is Joe.”
PSTN to MSC:
Message to Lynn: “Hello, Lynn, this is Joe.”
MSC to Base station #1:
Message to Lynn: “Hello, Lynn, this is Joe.”
Base station #1 to Lynn:
Message to Lynn: “Hello, Lynn, this is Joe.”

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