osmodevcon rbs6k initial version

2018/osmodevcon2018-rbs6xxx/osmodevcon2018-rbs6xxx.adoc

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+Ericsson RBS6000 Series
+=======================
+:author:	Harald Welte <laforge@gnumonks.org>
+:copyright:	2018 by Harald Welte (License: CC-BY-SA)
+:backend:	slidy
+:max-width:	45em
+
+== Ericsson RBS 6000 Series
+
+* very popular series of Radio Base Stations (RBS) during last decade
+* supports _many_ different configurations built from various modules
+** *Digital Units* (DU)
+** *Radio Units* (DU)
+** miscellaneous bits like shelves / racks, fans, fuses, OVP, cables, PSU, ...
+* supports both
+** classic BTS cabinets with radio
+** remote (tower mounted) radio heads
+
+== RBS 6000 Series Overview
+
+image::rbs6k-intro.png[width="100%"]
+
+== Think of it as "Lego"
+
+image::rbs6k-lego.png[width="100%"]
+
+== Example: RBS6201 Rack
+
+image::rbs6201-rack.png[width="75%"]
+
+== Example: RBS6201 Shelf
+
+Example shelf with 6x radio unit and 1x WCDMA digital unit
+
+image::rbs6201-shelf.png[]
+
+== GSM: DUG 10 + RUG
+
+* first generation GSM modules for RBS6000
+* closely resembles RBS2000 architecture
+** *DUG 10* like RBS2000 IXU/DXU
+** *RUG* like RBS2000 RRU: TRX
+* interconnection between DUG 10 + RUG is still TDM, not baseband samples!
+
+== Digital Unit GSM *DUG 10*
+
+* up to 12 TRX, grouped in 1..6 logical BTS
+* matches most closely IXU or DXU of previous RBS2xxx series
+* no baseband processing inside, just protocol logic (LAPDm + RSL + OM2000)
+* 6x HSIO connector for interface towards *RUG*
+* 4x E1/T1 ports exposed on RJ45 connectors
+
+== Radio Unit GSM *DUG*
+
+* GSM only
+* 2 TRX in hardware
+** any of them can be GSM, WCDMA or LTE
+* 48W per TRX un-combined
+* 22W per TRX combined (internal hybrid combiner)
+
+image::dug.png[]
+
+== GSM: DUG 20 + RUS
+
+* second generation GSM modules for RBS6000
+* more closely resembles the UMTS + LTE modules
+* all baseband processing in *DUG 20*
+** digital baseband I/Q samples between *DUG 20* and *RUS*
+* interconnection uses CPRI (Common Public Radio Interface)
+* connectors typically SFP format.
+** can be used with SFP optics + fiber (many km long)
+** can be used with direct copper SFP interconnect cables (few m)
+
+== Digital Unit GSM *DUG 20*
+
+* up to 12 TRX, gruoped in 1..6 logical BTS
+* includes baseband processing, unlike DUG 10
+* 6 SFP slots with CPRI towards Radio Units (*RUS*)
+* 4x E1/T1/J1 ports exposed on two RJ45 connectors
+
+== Radio Unit Mulit-Standard *RUS 01*
+
+* GSM WCDMA and LTE
+* 4 carriers over 20 MHz IBW
+** any of them can be GSM, WCDMA or LTE
+* up to 1x 80W (one multi-channel PA)
+** 20W without special license key
+** up to 80W with license keys
+
+image::rus.png[]
+
+* RUS 02 has 40 MHz IBW
+** up to 8 GSM carriers
+** up to 4 WCDMA or LTE carriers
+
+== UMTS: DUW + RUS
+
+* *DUW* is Digital Unit WCDMA
+* is used with RUS or RRUS (like DUG 20)
+* offers Iub interface to RNC
+* no FOSS RNC, so not very interesting :(
+
+== LTE: DUL + RUS
+
+* *DUL* is Digital Unit LTE
+
+
+== Combined UMTS + GSM setup (classic approach)
+
+image::1ru_per_sector_rbb12_1a.png[width="100%"]
+
+* works the same way with DUL + DUG for LTE + GSM
+
+== Combined UMTS + GSM setup (classic approach)
+
+image::2ru_per_sector_rbb22_2b.png[width="100%"]
+
+* works the same way with DUL + DUG for LTE + GSM
+
+
+== GSM/UMTS/LTE in one: DUS 31 / 41
+
+* *DUS* are _multi-standard DU_ (GSM/UMTS/LTE)
+* DUS 31 capacity up to 24 GSM TRX
+** or up to 12 GSM TRX combined with LTE
+* DUS 41 capacity up to 48 GSM TRX
+** or up to 12 GSM TRX combined with LTE
+* Back-haul is Ethernet only, no E1/T1/J1 anymore
+** it is presumed that it's like an internal software-only SIU-02
+
+image::dus4101.png[]
+
+== Ericsson + Osmocom
+
+We do have some history of RBS2000 support
+
+* OsmoNITB has OM2000 implementation proven with RBS2000
+* OsmoBSC inherits that, but breaks voice (no E1 in `osmo-mgw` yet)
+* OsmoBSC has `pcu_sock` interface for BSC-colocated PCU
+* Adding E1/TDM user plane support to osmo-mgw would enable using Ericsson RBS again
+* All that's missing for low-cost macro BTS with Osmocm is an inexpensive E1 interface
+** see separate talk
+
+== EOF
+
+End of File