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osmocon2018: reintroducing E1

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Harald Welte 2018-04-14 00:15:38 +02:00
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commit 98895caa2d
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Re-introducing E1 in OsmoBSC
============================
:author: Harald Welte <laforge@gnumonks.org>
:copyright: 2018 by Harald Welte (License: CC-BY-SA)
:backend: slidy
:max-width: 45em
== Intro
* OpenBSC (later OsmoNITB) started with E1 BTS
* until NITB Split, E1 support remained present
* even old OsmoBSC (sccplite) never had E1 BTS suport
* new OsmoBSC also has no E1 BTS support
* let's change that!
== Classic OsmoNITB with E1-BTS + ext MNCC
image::osmo-userplane1_e1_mncc.svg[width="100%"]
* Abis/E1 with 16k sub-slots in 64k slots
* E1 device offers 64k timeslots only
** 16k sub-channel mux/demux done in software
* TRAU frames in 16k sub-slots decoded (to FR/EFR codec frames)
* passed next to MNCC signaling over MNCC socket
== Classic OsmoNITB with E1-BTS + ext MNCC + RTP
image::osmo-userplane2-e1_rtp.svg[width="100%"]
* just like previous example, but we generate RTP from TRAU frames
* MNCC interface is signaling only
* user voice frames handled via RTP
== Classic OsmoNITB with IP-BTS + ext MNCC + RTP proxy
image::osmo-userplane3-rtp_proxy.svg[width="100%"]
* Abis/IP BTS use RTP transport for speech frames
* OsmoNITB is asked to provide RTP proxy functionality
== Classic OsmoNITB with IP-BTS + ext MNCC + direct RTP
image::osmo-userplane4-rtp_direct.svg[width="100%"]
* Abis/IP BTS use RTP transport for speech frames
* OsmoNITB rtp_proxy is disabled
* RTP data passes directly from BTS to external PBX and vice-versa
== IP-BTS User Plane in post-NITB
When using IP-based BTS like OsmoBTS, this looks like this:
[graphviz]
----
digraph G {
rankdir=LR;
BSC [label="OsmoBSC"];
MSC [label="OsmoMSC"];
MGWb [label="OsmoMGW\n(BSC)"];
MGWm [label="OsmoMGW\n(MSC)"];
{ rank=same; BSC; MGWb; };
{ rank=same; MSC; MGWm; };
BTS -> BSC [label="A-bis/IP (RSL+OML)"];
BSC -> MSC [label="A (BSSAP)"];
BTS -> MGWb [label="RTP"];
MGWb -> MGWm [label="RTP"];
MSC -> PBX [label="MNCC"];
MGWm -> PBX [label="RTP"];
BSC -> MGWb [label="MGCP"];
MSC -> MGWm [label="MGCP"];
}
----
* RTP to/from the BTS is handled by the BSC-colocated OsmoMGW
== E1-BTS User Plane in post-NITB
When using E1-based BTS, it should look like this:
[graphviz]
----
digraph G {
rankdir=LR;
BSC [label="OsmoBSC"];
MSC [label="OsmoMSC"];
MGWb [label="OsmoMGW\n(BSC)"];
MGWm [label="OsmoMGW\n(MSC)"];
{ rank=same; BSC; MGWb; };
{ rank=same; MSC; MGWm; };
BTS -> BSC [label="A-bis/E1 (RSL+OML)"];
BSC -> MSC [label="A (BSSAP)"];
BTS -> MGWb [label="TRAU-Frames\nover E1"];
MGWb -> MGWm [label="RTP"];
MSC -> PBX [label="MNCC"];
MGWm -> PBX [label="RTP"];
BSC -> MGWb [label="MGCP"];
MSC -> MGWm [label="MGCP"];
}
----
* TRAU frames in 16k E1 sub-slots to/from the BTS are handled by the BSC-colocated OsmoMGW
* OsmoMGW needs real media gateway functionality from E1 sub-slots to RTP
* E1 driver needs to support single E1 span (line) that
** opens RSL/OML LAPDm signaling on one TS from OsmoBSC
** opens TRAU on other TS from OsmoMGW
* `osmo-bsc.cfg` states which Um TS maps to which E1 TS/SS
* `osmo-bsc` uses MGCP EP naming scheme like `E1/Line1/TS4/SS2@mgw`
== EOF
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