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

Think of it as "Lego"

Example: RBS6201 Rack

Example: RBS6201 Shelf

Example shelf with 6x radio unit and 1x WCDMA digital unit

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)

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

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)

works the same way with DUL + DUG for LTE + GSM

Combined UMTS + GSM setup (classic approach)

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

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

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