Unbounded AGCH queue in OsmoBTS

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Andreas Eversberg andreas at eversberg.eu
Tue Sep 10 09:04:48 UTC 2013


Alexander Chemeris wrote:
> 1) what is a good way to calculate it?
> 2) should we configure this queue length over OML, or move the queue
> from BTS to BSC?
i suggest to use two queues:

  * IMM.ASS messages which grant access
  * IMM.ASS messages which reject access

the first queue should have higher priority, because giving access to 
mobile stations will sooner or later resolve the rach flood.

another suggestion is to use a stack, rather than a fifo. this will 
ensure that latest assigned/rejected channels are handled first. we 
don't need to consider how long the mobile will wait for the 
assign/reject message, so we don't need to define a specific stack size. 
the latest messages will always be sent out early enough. the stack 
should have a limit, so oldest messages are dropped, if new messages are 
added. i still have no good solution for the maximum stack size.




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