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-rw-r--r--doc/manuals/chapters/overview.adoc28
1 files changed, 10 insertions, 18 deletions
diff --git a/doc/manuals/chapters/overview.adoc b/doc/manuals/chapters/overview.adoc
index 566124a3..2ff92faa 100644
--- a/doc/manuals/chapters/overview.adoc
+++ b/doc/manuals/chapters/overview.adoc
@@ -23,16 +23,16 @@ OsmoNITB/OsmoBSC/OsmoBTS, the PCU is co-located within the BTS.
[graphviz]
----
digraph G {
- rankdir=LR;
- MS0 [label="MS"]
- MS1 [label="MS"]
- MS0->BTS [label="Um"]
- MS1->BTS [label="Um"]
- BTS->BSC [label="Abis"]
- BSC->MSC [label="A"]
- BTS->PCU [label="pcu_sock"]
- PCU->SGSN [label="Gb"]
- SGSN->GGSN [label="GTP"]
+ rankdir=LR;
+ MS0 [label="MS"];
+ MS1 [label="MS"];
+ MS0->BTS [label="Um"];
+ MS1->BTS [label="Um"];
+ BTS->BSC [label="Abis"];
+ BSC->MSC [label="A"];
+ BTS->PCU [label="pcu_sock"];
+ PCU->SGSN [label="Gb"];
+ SGSN->GGSN [label="GTP"];
}
----
@@ -68,14 +68,6 @@ The GPRS Mobility Management implementation is quite simplistic at this
point. It supports the GPRS ATTACH and GPRS ROUTING AREA UPDATE
procedures, as well as GPRS ATTACH and GPRS DETACH.
-However, as the SGSN currently does not implement any type of HLR
-access, it is not able to authenticate a subscriber or even check if the
-subscriber exists at all. As such, all non-roaming subscribes are
-allowed to attach to OsmoSGSN. Non-roaming means that the first 5
-digits of the IMSI must match the MCC and MNC of the cell that the
-subscriber is registering to.
-
-
==== LLC Implementation
The LLC (Logical Link Control) implementation of OsmoSGSN only supports