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example for gsm reselection
The "Border Roaming Protocol" tools monitor LU requests towards HLR. They match the VLR in the LU request with the IMSI. If the VLR is different form home the LU is denied and SIM will try to make LU in another VLR. The same idea is applied to steered roaming.
difference between gsm ss7 and ss7 core
XCDR..the Transcoder
In GSM it is not called XCDR..it is called TRC - Transcoder Controller, an acronym used by Ericsson.
It is a functionality integrated in the BSC.
GSM Security
Well not the AUC but the algorithm stored there and in the SIM.
Specs for A3/A8 can be found in 3GPP TS 43.020.
https://www.3gpp.org/ftp/Specs/archive/43_series/
capacity of 1 erlang
The capacity of the lines is calculated using Erlang B formula (see wikipedia for more) and will show the capacity offered and the capacity requested. The formula works on call attempts registered and mean holding time (average call time).
For an hour the node will count...
Re: GSM Security
I don't understand the question.
In GSM there is the AuC node which assures that the events (calls, SMS, SS invocations etc) are ciphered and encrypted. You can find plenty of information on the internet. What else do you need about the security?
Re: GSM mobile network
Depending on the country you can apply for e MVNO license. It will allow you to use the network of another GSM provider without having your own.
what is ss7
As I said depends on the function. Yes it can be a different GT for MSCs and for VLR. It will require SCCP routing on GT and SSN and not on SP. There are different SSNs for VLR and for MSC, GMSC. Here you have a list.
6 -HLR
7 - VLR
8 -GMSC, MSC
9 - EIR
10 - AUC
12 -SC
146- CAMEL...
ss7 network between bsc and msc
Hi.
I really don't understand the question. What do you mean? The VLR GT normally is only one since that is the GT the nodes contact for info (e.g the HLR for MSRN).
Gt is the info needed for SCCP Routing. One MSC node can have functionalities embedded such as...
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