fixup
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0fc04dec87
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959b2b1a8e
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@ -3870,6 +3870,18 @@ using Osmocom stack with OsmoHNBGW / OsmoMSC / OsmoSGSN
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</li>
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</ul>
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</li>
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<li>
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<span>
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I’m still involved with developing the related software, but have handed over actual network operation at CCC events to a team around lynxis and bibor
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</span>
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<ul class="">
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<li>
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<span>
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this means I have time for playing with LTE
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</span>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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@ -3947,7 +3959,7 @@ OpenAirInterface
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<ul class="">
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<li>
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<span>
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obscure code base; difficult to build; "
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obscure code base; difficult to build
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</span>
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</li>
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<li>
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@ -3966,6 +3978,23 @@ RAN part under non-free, non-opensource but <em>source available</em> license
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<span>
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nextepc
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</span>
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<ul class="">
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<li>
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<span>
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the clear underdog
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</span>
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</li>
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<li>
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<span>
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very capable; many features (SGs, handover on X2 and S1, SBc)
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</span>
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</li>
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<li>
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<span>
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readable code!
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</span>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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@ -4032,7 +4061,7 @@ LTE: HSS, speaking DIAMETER
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</li>
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<li>
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<span>
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We need a so-called 'inter-working function (IWF)
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We need a so-called <em>inter-working function</em> (IWF)
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</span>
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<ul class="">
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<li>
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@ -4076,11 +4105,16 @@ UpdateLocation (registration)
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</li>
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</ul>
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</li>
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<li>
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<span>
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code at <a href="https://git.osmocom.org/erlang/osmo_dia2gsup/">https://git.osmocom.org/erlang/osmo_dia2gsup/</a>
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</span>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_network_layout">Network layout</h1>
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<h1 id="_network_layout_logical">Network layout (logical)</h1>
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<div class="sectionbody" style="max-width:45em">
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<div class="imageblock graphviz">
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<div class="content">
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@ -4090,6 +4124,198 @@ UpdateLocation (registration)
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_network_layout_physical">Network layout (physical)</h1>
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<div class="sectionbody" style="max-width:45em">
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<ul class="">
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<li>
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<span>
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6 eNodeBs distributed around the camp inside select Datenklos
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</span>
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<ul class="">
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<li>
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<span>
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Ericsson RBS6402 with 23dBm in Band 7
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</span>
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</li>
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<li>
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<span>
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back-haul over regular CCC Ethernet as separate VLAN
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</span>
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</li>
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</ul>
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</li>
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<li>
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<span>
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Stratum-0 NTP server with GPS receiver for eNB clock sync
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</span>
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<ul class="">
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<li>
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<span>
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built on Raspi 3B with gpsd + ntpd
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</span>
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</li>
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</ul>
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</li>
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<li>
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<span>
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Lenovo x240 Laptop running qemu-kvm for core network
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</span>
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<ul class="">
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<li>
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<span>
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runs nextepc MME, SGW, PGW
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</span>
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</li>
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<li>
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<span>
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runs osmo_dia2gsup for translating DIAMETER to GSUP
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</span>
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</li>
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</ul>
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</li>
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<li>
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<span>
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Querying Camp 2G/3G OsmoHLR for subscriber data
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</span>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_radio_paramters">Radio paramters</h1>
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<div class="sectionbody" style="max-width:45em">
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<ul class="">
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<li>
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<span>
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Telefonica O2 has provided (borrowed) 10 MHz of spectrum in Band 7 (2600 MHz)
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</span>
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</li>
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<li>
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<span>
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We can use it either as one channel @ 10 MHz or two chnanels @ 5 MHz
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</span>
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<ul class="">
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<li>
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<span>
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first four days were operated using 5 MJz channels (3 eNB on each channel)
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</span>
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</li>
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<li>
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<span>
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last day was operated using 10 MHz channels (6 eNB on same channel)
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</span>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_results_1_2">Results (1/2)</h1>
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<div class="sectionbody" style="max-width:45em">
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<ul class="">
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<li>
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<span>
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Telekom technician Peter "@33dBm" Schmidt has done some testing
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</span>
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<ul class="">
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<li>
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<span>
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first test with 5MHz chnanels: <a href="https://twitter.com/33dBm/status/1165393409852563457">https://twitter.com/33dBm/status/1165393409852563457</a>
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</span>
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</li>
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<li>
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<span>
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problems with neighbor selection due to dual-frequency network
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</span>
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</li>
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<li>
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<span>
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Average throughput 33.6 Mbps down / 9.1 Mbps up)
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</span>
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</li>
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</ul>
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</li>
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</ul>
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<div class="imageblock">
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<div class="content">
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<img src="camp2019-lte-map2.jpeg" alt="camp2019-lte-map2.jpeg" width="30%" />
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</div>
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</div>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_results_2_2">Results (2/2)</h1>
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<div class="sectionbody" style="max-width:45em">
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<ul class="">
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<li>
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<span>
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Telekom technician Peter "@33dBm" Schmidt has done some testing
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</span>
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<ul class="">
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<li>
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<span>
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second test with 10 MHz chnanels: <a href="https://twitter.com/33dBm/status/1165576180961095680">https://twitter.com/33dBm/status/1165576180961095680</a>
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</span>
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</li>
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<li>
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<span>
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better neighbor selection
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</span>
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</li>
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<li>
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<span>
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improved throughput (Average 62.7 Mbps down / 20.8 Mbps up)
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</span>
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</li>
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</ul>
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</li>
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</ul>
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<div class="imageblock">
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<div class="content">
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<img src="camp2019-lte-results.jpeg" alt="camp2019-lte-results.jpeg" width="30%" />
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</div>
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</div>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_thanks">Thanks</h1>
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<div class="sectionbody" style="max-width:45em">
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<ul class="">
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<li>
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<span>
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to the Camp GSM team for operating 2G/3G
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</span>
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</li>
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<li>
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<span>
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to Eventphone / POC for handling user registration UI and voice interconnect
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</span>
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</li>
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<li>
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<span>
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to Sukchan Lee (@acetcom) for writing nextepc
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</span>
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</li>
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<li>
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<span>
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to Dieter Spaar for all of his support during the past 10 years
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</span>
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</li>
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<li>
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<span>
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to Peter Schmidt (@33dBm) for professional rive (bike ride) testing
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</span>
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</li>
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<li>
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<span>
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to Telefonica O2 Germany for borrowing us some of their Band 7 frequencies
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</span>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect1 slide">
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<h1 id="_eof">EOF</h1>
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<div class="sectionbody" style="max-width:45em">
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<div class="paragraph"><p>End of File</p></div>
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