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BSC,BTS: add diagrams of PCU-BTS-NITB-SGSN relationships 

Change-Id: I0eb09706efb768fa4f6810872fb6568cbc9838cb
This commit is contained in:
Ivaylo Kostov 2016-12-29 15:26:59 +01:00 committed by Neels Hofmeyr
parent 7f7ca91a04
commit 931ec5a5b6
1 changed files with 69 additions and 0 deletions
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doc/manuals/chapters/overview.adoc
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@ -13,6 +13,75 @@ Unlike the highly integrated OmsoNITB, OsmoBSC implements a more classic
GSM Base Station Controller with A-bis interface towards BTSs and A
interface towards a MSC.
The difference between classic GSM network architecture and
the OsmoNITB based GSM network architecture is illustrated in
<<fig-gsm-classic>> and <<fig-gsm-nitb>>.
[[fig-gsm-classic]]
.Classic GSM network architecture (simplified)
[graphviz]
----
digraph G {
rankdir=LR;
MS0 [label="MS"];
MS1 [label="MS"];
MS2 [label="MS"];
MS3 [label="MS"];
BTS0 [label="BTS"];
BTS1 [label="BTS"];
BSC;
MSC [label="MSC/VLR"];
HLR [label="HLR/AUC"];
EIR;
SMSC;
MS0->BTS0 [label="Um"];
MS1->BTS0 [label="Um"];
MS2->BTS1 [label="Um"];
MS3->BTS1 [label="Um"];
BTS0->BSC [label="Abis"];
BTS1->BSC [label="Abis"];
BSC->MSC [label="A"];
MSC->HLR [label="C"];
MSC->EIR [label="F"];
MSC->SMSC;
}
----
[[fig-gsm-nitb]]
.GSM system architecture using OsmoNITB
[graphviz]
----
digraph G {
rankdir=LR;
MS0 [label="MS"];
MS1 [label="MS"];
MS2 [label="MS"];
MS3 [label="MS"];
BTS0 [label="BTS"];
BTS1 [label="BTS"];
EXTMNCC [label="Linux Call Router / SoftSwitch / PBX\n(optional)"];
MS0->BTS0 [label="Um"];
MS1->BTS0 [label="Um"];
MS2->BTS1 [label="Um"];
MS3->BTS1 [label="Um"];
BTS0->BSC [label="Abis"];
BTS1->BSC [label="Abis"];
subgraph cluster_nitb {
label = "OsmoNITB";
BSC;
MSC [label="MSC/VLR"];
SMSC;
EIR;
HLR [label="HLR/AUC"];
BSC->MSC;
MSC->HLR;
MSC->EIR;
MSC->SMSC;
}
MSC -> EXTMNCC [label="external MNCC"];
}
----
=== Software Components