Overall Roadmap¶

This is the general direction in which we would like the Osmocom Cellular Infrastructure projects to move. None of this will of course happen
without significant contribution and/or funding:

BTS¶

• more systematic generation + reporting of alarms over Abis OML
• communication of BTS specific capabilities/features towards BSC (via Abis extension) to avoid BTS/BSC config mismatches

BSC¶

• BSC/MSC split: Real A interface with BSSAP/BSSMAP between MSC and BSC
• Support of 3GPP A-over-IP in addition to current non-standard IPA multiplex / SCCPlite
• Alarm handling
  • generation of Alarms inside the BSC
  • aggregation/forwarding of Alarms received from Abis
  • reporting of alarms via control interface
  • control interface / SNMP proxy for alarm -> trap conversion
• Move all media processing (TRAU frames, RTP) to separate MGW daemon, controlled via MGCP

Core Network¶

• BSC/MSC split: Real A interface with BSSAP/BSSMAP between MSC and BSC
• externalize the HLR+AUC from the NITB (osmo-gsup-hlr)
• support for UMTS AKA over GERAN
• support of SMS delivery via GPRS
• support of combined CS/PS attach (2G and 3G)
• support of inter-BSC hand-over (after BSC/MSC split)
• support of inter-MSC hand-over (after HLR+AUC externalization)
• Real A interface (MTP2/MTP3/SCCP)
• Move all media processing (TRAU frames, RTP) to separate MGW daemon, controlled via MGCP

3G/3.5G related¶

• Iu-CS and Iu-PS interface over M3UA (as specified in 3GPP), not just SUA (current implementation)
• test/validate mobility between multiple hNodeB/smallcells
• hand-over between multiple hNodeB/smallcells
• Iu-CS/Iu-PS validation against RNCs
• Iuh validation against more hNodeB/smallcell vendors
• inter-RAT mobility (2G <-> 3G)
• network with simultaneous 2G and 3G/3.5G cells

PCU¶

• more complete EGPRS implementation for uplink and downlink
• multi-slot uplink support
• PTCCH support (TA loop for fast moving MS)

Build and Test infrastructure¶

• more mature osmo-gsm-tester setup
  • have osmo-gsm-tester do full end-to-end regression testing on every commit or every night
  • develop test cases for MO-Call, MT-Call, Hold/Retrieve, USSD, SMS-in-Call, hand-over, etc.
  • not only functional testing, but performance testing (time to deliver N SMS)
  • GPRS/EGPRS testing
    • (single-MS ul/dl throughput, multi-MS ul/dl throughput)
    • mobility between different BTS/PCUs
  • testing against different modems (different baseband processr, protocol stack)

Libraries/Infrastructure¶

• VTYv2: Externalize VTY + config management
  • shared daemon that manages a MIB and offers VTY + control interface to access that MIB
  • individual programs just access that config daemon via well-defined API
  • preferably with transactions, roll-back
  • avoid hand-written code for parsing individual VTY commands
  • avoid duplicate code for VTY + Control interface