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Questions tagged [gsm]

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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
Santiago Mercante's user avatar
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0 answers
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Is GSM developed anymore?

Is the GSM standard/spesification developed anymore? Does the GSM spesification/paper get any updates anymore? Are UMTS, LTE, 5G NR versions of the GSM standard or separate standards? Of course them ...
worner's user avatar
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1 answer
73 views

What is terminal adapter?

What exactly is an terminal adapter (TA) in an mobile station? Why a terminal equipment (TE) and an mobile termination (MT) can't communicate directly via AT protocol? Why it needs this separate ...
worner's user avatar
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Why GSM do challenge-response authencation before encryption?

I read this Wikipedia article and I can't understand, why GSM do challenge-response authencation before encryption? Why it doesn't start encryption at the beggining and authencate with it? Why this: ...
worner's user avatar
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0 votes
2 answers
60 views

Why mobile communication protocols have *G umbrella names?

Why mobile communication protocols have *G umbrella names, like 1G, 2G, 3G, 4G and 5G? Who order them? And most inportantly, have them any technically defitions? I mean, actually protocols are GSM, ...
worner's user avatar
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1 vote
1 answer
302 views

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 ...
zazar's user avatar
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7 votes
2 answers
613 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 ...
Duje Lalic's user avatar
0 votes
1 answer
323 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 ...
Lewis Kelsey's user avatar
1 vote
1 answer
146 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 ...
CuriousStudent's user avatar
3 votes
1 answer
828 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) ...
Walidebisi's user avatar
1 vote
3 answers
291 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 ...
YohjiNakamoto's user avatar
2 votes
2 answers
877 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 ...
Amirreza Nasiri's user avatar