<p>laforge <strong>submitted</strong> this change.</p><p><a href="https://gerrit.osmocom.org/c/osmo-bsc/+/21262">View Change</a></p><div style="white-space:pre-wrap">Approvals:
Jenkins Builder: Verified
dexter: Looks good to me, approved
</div><pre style="font-family: monospace,monospace; white-space: pre-wrap;">update aoip-mgw-options document with reality of 2020<br><br>This was started in 2017 before the NITB split. Let's align it with<br>reality, mostly in terms of naming and making explicit what was<br>implemented.<br><br>Change-Id: Ib4e66b565a1edfc5ea8c1446f911011bfd4b1642<br>---<br>M doc/manuals/aoip-mgw-options-docinfo.xml<br>M doc/manuals/aoip-mgw-options.adoc<br>M doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc<br>M doc/manuals/mgw/osmo-bsc-new-mgw.msc<br>4 files changed, 33 insertions(+), 15 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/doc/manuals/aoip-mgw-options-docinfo.xml b/doc/manuals/aoip-mgw-options-docinfo.xml</span><br><span>index 0809594..4cec92f 100644</span><br><span>--- a/doc/manuals/aoip-mgw-options-docinfo.xml</span><br><span>+++ b/doc/manuals/aoip-mgw-options-docinfo.xml</span><br><span>@@ -7,6 +7,14 @@</span><br><span> Initial version of the proposal for internal discussion.</span><br><span> </revremark></span><br><span> </revision></span><br><span style="color: hsl(120, 100%, 40%);">+ <revision></span><br><span style="color: hsl(120, 100%, 40%);">+ <revnumber>1.0</revnumber></span><br><span style="color: hsl(120, 100%, 40%);">+ <date>November 2020</date></span><br><span style="color: hsl(120, 100%, 40%);">+ <authorinitials>Harald Welte</authorinitials></span><br><span style="color: hsl(120, 100%, 40%);">+ <revremark></span><br><span style="color: hsl(120, 100%, 40%);">+ Update with changes on what was actually implemented in recent years; change from future to past tense.</span><br><span style="color: hsl(120, 100%, 40%);">+ </revremark></span><br><span style="color: hsl(120, 100%, 40%);">+ </revision></span><br><span> </revhistory></span><br><span> </span><br><span> <authorgroup></span><br><span>@@ -24,7 +32,7 @@</span><br><span> </authorgroup></span><br><span> </span><br><span> <copyright></span><br><span style="color: hsl(0, 100%, 40%);">- <year>2017</year></span><br><span style="color: hsl(120, 100%, 40%);">+ <year>2017-2020</year></span><br><span> <holder>sysmocom - s.f.m.c. GmbH</holder></span><br><span> </copyright></span><br><span> </span><br><span>diff --git a/doc/manuals/aoip-mgw-options.adoc b/doc/manuals/aoip-mgw-options.adoc</span><br><span>index 124c03f..62163cc 100644</span><br><span>--- a/doc/manuals/aoip-mgw-options.adoc</span><br><span>+++ b/doc/manuals/aoip-mgw-options.adoc</span><br><span>@@ -5,8 +5,8 @@</span><br><span> This document serves as a paper to illustrate the different</span><br><span> configurations of OsmoBSC in terms of integration with BTSs and MSCs.</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-The document should accompany us in the 2017 development cycle which</span><br><span style="color: hsl(0, 100%, 40%);">-includes the _death of the NITB_, i.e. the move away from OsmoNITB to</span><br><span style="color: hsl(120, 100%, 40%);">+The document was created ahead of the 2017 development cycle which</span><br><span style="color: hsl(120, 100%, 40%);">+included the _death of the NITB_, i.e. the move away from OsmoNITB to</span><br><span> having OsmoBSC in all configurations, whether with a</span><br><span> proprietary/external MSC or with OsmoMSC.</span><br><span> </span><br><span>@@ -24,8 +24,13 @@</span><br><span> </span><br><span> === Classic GSM RAN with E1 based Abis and E1 A</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-This configuration was actually never supported by OpenBSC, as E1 BTS</span><br><span style="color: hsl(0, 100%, 40%);">-support was so far for NITB only, but not for OsmoBSC.</span><br><span style="color: hsl(120, 100%, 40%);">+This is how GSM was originally specified when it was introduced: E1/T1</span><br><span style="color: hsl(120, 100%, 40%);">+circuits on all interfaces, no IP anywhere.</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+This configuration was actually never supported by OpenBSC, as E1</span><br><span style="color: hsl(120, 100%, 40%);">+support was always only on the Abis side (OpenBSC, OsmoNITB and today OsmoBSC).</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+We never supported A interface over E1. It could be done if there was a need.</span><br><span> </span><br><span> [mscgen]</span><br><span> ----</span><br><span>@@ -53,11 +58,11 @@</span><br><span> interoperable A-over-IP (AoIP) interface shall look like.</span><br><span> </span><br><span> As more modern MSCs at operators tend to favor implementing 3GPP AoIP</span><br><span style="color: hsl(0, 100%, 40%);">-rather than the proprietary SCCPlite based A interface, it becomes</span><br><span style="color: hsl(120, 100%, 40%);">+rather than the proprietary SCCPlite based A interface, it became</span><br><span> necessary for OsmoBSC to support this.</span><br><span> </span><br><span> At the same time, for compatibility reasons, the classic SCCPlite</span><br><span style="color: hsl(0, 100%, 40%);">-support shall be kept, if possible with reasonable effort.</span><br><span style="color: hsl(120, 100%, 40%);">+support is kept in OsmoBSC as a configuration option.</span><br><span> </span><br><span> [mscgen]</span><br><span> ----</span><br><span>@@ -65,11 +70,16 @@</span><br><span> ----</span><br><span> </span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-=== OsmoBSC 2017+: 3GPP AoIP + Abis/E1</span><br><span style="color: hsl(120, 100%, 40%);">+=== OsmoBSC 2020+: 3GPP AoIP + Abis/E1</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-Since OsmoNITB will soon be deprecated, we will use OsmoBSC in all</span><br><span style="color: hsl(0, 100%, 40%);">-Osmocom GSM ntework setups, requiring the support for classic E1/T1</span><br><span style="color: hsl(0, 100%, 40%);">-based BTSs from OsmoBSC.</span><br><span style="color: hsl(120, 100%, 40%);">+Since OsmoNITB was deprecated in 2017, and OsmoBSC only supported Abis/IP,</span><br><span style="color: hsl(120, 100%, 40%);">+we temporarily lost the ability to use classic E1 based BTSs. In 2020,</span><br><span style="color: hsl(120, 100%, 40%);">+we re-introduced and re-tested the support of Abis/E1.</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+Fro the control plane of Abis (RSL, OML) the E1 support via libosmo-abis</span><br><span style="color: hsl(120, 100%, 40%);">+never really ceased to exist. But for the user plane, E1 support had to be</span><br><span style="color: hsl(120, 100%, 40%);">+introduced to osmo-mgw, and osmo-bsc needed to be taught how to configure</span><br><span style="color: hsl(120, 100%, 40%);">+E1 endpoints at the MGW. The related call flow for such setups looks like this:</span><br><span> </span><br><span> [mscgen]</span><br><span> ----</span><br><span>diff --git a/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc b/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc</span><br><span>index 04b114f..676948c 100644</span><br><span>--- a/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc</span><br><span>+++ b/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc</span><br><span>@@ -1,8 +1,8 @@</span><br><span> # MO-Call with E1 BTS + OsmoBSC with true 3GPP AoIP (planned</span><br><span style="color: hsl(0, 100%, 40%);">-# osmo-bsc_mgcp has to be extended to true MGW functionality!</span><br><span style="color: hsl(120, 100%, 40%);">+# osmo-mgw has to be extended to true MGW functionality!</span><br><span> msc {</span><br><span> hscale=2;</span><br><span style="color: hsl(0, 100%, 40%);">- ms [label="MS"], bts [label="E1 BTS"], bsc[label="OsmoBSC"], mgcp[label="osmo-bsc_mgcp"], m_sc[label="MSC"];</span><br><span style="color: hsl(120, 100%, 40%);">+ ms [label="MS"], bts [label="E1 BTS"], bsc[label="OsmoBSC"], mgcp[label="osmo-mgw"], m_sc[label="MSC"];</span><br><span> </span><br><span> ms box m_sc [label="We assume a SDCCH is already established"];</span><br><span> ...;</span><br><span>diff --git a/doc/manuals/mgw/osmo-bsc-new-mgw.msc b/doc/manuals/mgw/osmo-bsc-new-mgw.msc</span><br><span>index e618bb7..d6450bd 100644</span><br><span>--- a/doc/manuals/mgw/osmo-bsc-new-mgw.msc</span><br><span>+++ b/doc/manuals/mgw/osmo-bsc-new-mgw.msc</span><br><span>@@ -1,7 +1,7 @@</span><br><span style="color: hsl(0, 100%, 40%);">-# MO-Call with OsmoBTS + OsmoBSC with true 3GPP AoIP (planned)</span><br><span style="color: hsl(120, 100%, 40%);">+# MO-Call with OsmoBTS + OsmoBSC with true 3GPP AoIP</span><br><span> msc {</span><br><span> hscale=2;</span><br><span style="color: hsl(0, 100%, 40%);">- ms [label="MS"], bts [label="OsmoBTS"], bsc[label="OsmoBSC"], mgcp[label="osmo-bsc_mgcp"], m_sc[label="MSC"];</span><br><span style="color: hsl(120, 100%, 40%);">+ ms [label="MS"], bts [label="OsmoBTS"], bsc[label="OsmoBSC"], mgcp[label="OsmoMGW"], m_sc[label="MSC"];</span><br><span> </span><br><span> ms box m_sc [label="We assume a SDCCH is already established"];</span><br><span> ...;</span><br><span></span><br></pre><p>To view, visit <a href="https://gerrit.osmocom.org/c/osmo-bsc/+/21262">change 21262</a>. 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<div style="display:none"> Gerrit-Project: osmo-bsc </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-Change-Id: Ib4e66b565a1edfc5ea8c1446f911011bfd4b1642 </div>
<div style="display:none"> Gerrit-Change-Number: 21262 </div>
<div style="display:none"> Gerrit-PatchSet: 2 </div>
<div style="display:none"> Gerrit-Owner: laforge <laforge@osmocom.org> </div>
<div style="display:none"> Gerrit-Assignee: dexter <pmaier@sysmocom.de> </div>
<div style="display:none"> Gerrit-Reviewer: Jenkins Builder </div>
<div style="display:none"> Gerrit-Reviewer: dexter <pmaier@sysmocom.de> </div>
<div style="display:none"> Gerrit-Reviewer: laforge <laforge@osmocom.org> </div>
<div style="display:none"> Gerrit-CC: pespin <pespin@sysmocom.de> </div>
<div style="display:none"> Gerrit-MessageType: merged </div>