OsmoBTS in RAN

All the sysmoBTS we are selling have the OsmoBTS stack on them. OsmoBTS is a BTS implementation which supports connection to specific L1/PHY layers via different backends. Towards the BSC, the OsmoBTS talks Abis/IP, towards the packet network it talks pcu_sock and towards the voice channels RTP is used. This makes it versatile for an all IP based setup.

We are not just offering the OsmoBTS software as part of our sysmoBTS products, but also happily offer porting and system integration services to any other BTS or cellular PHY vendor who is interested in running the royalty-free Osmocom stack on their platform.

Software / Logical specification

Supported timeslot configurations CCCH, CCCH+SDCCH/4, SDCCH/8, TCH/F, TCH/H, PDCH
Back-haul (Signaling) A-bis according to TS 48.058 and TS 52.021, encapsulated over TCP/IP; Gb (NS/UDP/IP) according to 3GPP TS 48.016 and 48.018 for GPRS
Back-haul (voice) RTP/UDP/IP with FR/HR/EFR/AMR payload according to IETF and ETSI specs
Ciphering A5/1, A5/2 and A5/3
GPRS/EDGE GPRS PCU with limited feature set. Initial EDGE implementation.
Operating System Embedded Linux

More technical information can be found on Osmocom.