Hi,
I further implemented the base of the virtual layer with the purpose of replacing the um-air interface with a multicast-socket solution. This has been started by Harald Welte some time ago in the Osmobts - laforge/virt-bts branch. As I was not really confident enough to create an official new branch before someone had a look on what I did, so I developed in copies of the osmocom-bb and osmo-bts projects on my github-page (https://github.com/BastusIII/osmocom-bb-virt/tree/stumpf/virt-um and https://github.com/BastusIII/osmo-bts-virt/tree/stumpf/virt-bts). If someone finds to time to have a look into them (structure, path, implementation) and give me feedback about it, I would be glad :). Please use the following config files that i have tested: - https://github.com/BastusIII/osmocom-config-files/blob/master/openbsc-virtua... - https://github.com/BastusIII/osmocom-config-files/blob/master/osmobts-virtua... - https://github.com/BastusIII/osmocom-config-files/blob/master/osmocom-bb-mob...
What works: BTS: - downlink over gsmtap and a multicast socket - OML and RSL on abis properly established and seems to work - virtual-um connection establishment Osmocom-bb: - virtual-um -- l23 app connection establishment (bridging osmocon, no serial link needed) - BCCH downlink handling and forwarding to l23 app - handling of some l1ctl requests from l23 (e.g. power management had to be mocked, so l23 gets a response and is satisfied)
What not: BTS: - missing uplink handling Osmocom-bb - missing uplink routines (RACH, TCH, dedicated channels) - handlers for l23 requests only partially implemented (missing TCH, RACH, ...
I a currently a bit overwhelmed by the mass of messages exchanged between l23-app (used mobile, btw.) and the virtual-um and hanging because mobile gets a sync timeout.
I am looking forward to hear from you :).
Sebastian Stumpf
Hi Sebastian,
thanks a lot for working on this and for requesting feedback.
It's quite a lot of code to review, so it might take a bit until you hear from me. But I definitely want to help.
If you menawhile have specific questions, please feel free to post them here and I'll try my best to respond, at least if nobody else respnds before me ;)
Regards, Harald
I a currently a bit overwhelmed by the mass of messages exchanged between l23-app (used mobile, btw.)
it might make sense to start with something more simple than a fully-blown 'mobile' program. Take the L1CTL primitives step by step, one at a time.
Hi Sebastian,
as quite some time has passed, I was wondering if you had any follow-up?
Have you published your existing progress/code in any publicly accessible repository? Remember: release early, release often :)
I would love to see progress here, and if there's something I can help with, let me know.
-
Harald Welte -
Sebastian Stumpf