Wiki¶

A good introduction to D-GSM can be found in the news section:
https://osmocom.org/projects/osmo-dist-gsm/news

Problem Areas¶

Routing Lookups for network elements
- Determine HLR IP/hostname by IMSI (to know which HLR to ask during GSUP SendAuthInfo + UpdateLocation)
  - could be static table / config file with ISMI prefix, like 334-42-001-0123456 where "001" is site/network name and "0123456" is the subscriber in that site/network
  - could use something like enum/DNS
- Determine HLR IP/hostname by MSISDN (to know which HLR to ask for current serving VLR/MSC IP/hostname)
  - could be static table / config file with ISMI prefix, like 52-123-012-3456 where "012" is a prefix for the given site/network and "3456" is the subscriber in that site/network. Probably too restrictive.
  - could use something like enum/DNS
Routing Lookups for subscribers
- determine serving VLR/MSC IP/hostname by MSISDN: SendRoutingInfo
Synchronization
- single-master multi-slave
  - subscriber data (MSISDN, IMSI, GPRS/SMS/Voice permission, Auth keys, ...)
- distributed
  - present location of subscriber (serving VLR/MSC)

Commercial support as well as development, system integration and training services for this project are available from sysmocom

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