Questions tagged [gsm]

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Authentication center in GSM

We know that the AuC (Authentication Center) is used to identify GSM subscribers in the case of roaming or when the subscriber is requesting access to mobile network for the first time. But, I'm ...
6
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2answers
188 views

How are different phone/GSM operators connected with each other?

This might be a noob question, but I am having trouble finding an answer to it. Let’s say I am a new GSM operator. How would I go about connecting my network and my subscribers to the rest of the ...
0
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1answer
116 views

What L4 protocol is used on the Abis GSM interface? DTAP (BSSAP)?

So it's BTSM over LAPD over (PCM30 over G.703). The BTSM message discriminator selects the RLM packet type and the next layer will select one of RR, MM or CM but what actually is this next layer. Is ...
1
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1answer
96 views

Why do we need to aggregate frames into a multiframe in GSM networks?

I'm struggling to understand the need for frame aggregation into the multiframe and other higher level frames. What exactly do we gain with the aggregation? Is this for synchronisation purposes across ...
3
votes
1answer
557 views

Cell information in GSM, UMTS, LTE

I'm trying to understand how a Mobile Station get the information about the cell from the BTS or the NodeB. The information I am looking for is : Mobile Country Code (MCC) Mobile Network Code (MNC) ...
1
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3answers
150 views

For 2G/GSM networks, are there "portable" cell towers?

Let's suppose I am in the middle of the desert or some kind of jungle, and I have no 2G/GSM Signal. I would like to know if there is any civilian technology (that is or maybe isn't available to the ...
2
votes
2answers
760 views

How GSM network routes Internet packets?

How does a GSM network route internet packets? Does GSM use NAT based PAT like a physical Router? For example, user A visits website #1 and user B visits website #2. how data of website #1 are given ...