Feature #1543

link/rate adaption as per spec

Added by laforge over 4 years ago. Updated 10 months ago.

Target version:
Start date:
Due date:
% Done:


Spec Reference:


Even for GPRS only, our downlink link/rate adaption currently is only based on the error rate in terms of how many lost RLC packets / bytes we see from that MS. This method works well but is not conforming to a certain standard.

As per the GPRS spec, it should be based on bit error rate, expressed as link quality measurements, as it is done in the uplink direction.

What needs to be done
  • the above metrics first need to be computed/generated as per spec and then passed into a decision making algorithm.
  • that algorithm should be modular so that we can experiment (and switch at runtime) future different algorithms to compare them against each other.
  • unit tests for metrics + inital algorithm

Also, it is a question whether we should keep all the above separate for uplink and downlink, resulting in possibly diffeent CS based on the direction.

Finally, the question is how to test this properly, in a way that can be automatized and become part of a continuous integration setup.

Related issues

Related to OsmoBTS - Bug #1616: osmo-bts-trx / osmo-bts-octphy doesn't provide C/I information to PCU Resolved02/23/2016

Related to OsmoPCU - Feature #1536: Implement adaptive CS selectionNew02/22/2016


#2 Updated by laforge over 4 years ago

  • Assignee set to neels

#3 Updated by neels over 4 years ago

My awareness level of this issue so far is very low.

#4 Updated by laforge over 4 years ago

  • Related to Bug #1616: osmo-bts-trx / osmo-bts-octphy doesn't provide C/I information to PCU added

#5 Updated by msuraev over 4 years ago

  • Related to Feature #1536: Implement adaptive CS selection added

#6 Updated by laforge about 4 years ago

  • Assignee changed from neels to msuraev

#7 Updated by laforge over 2 years ago

  • Assignee deleted (msuraev)

#8 Updated by laforge about 2 years ago

#9 Updated by laforge over 1 year ago

  • Assignee set to lynxis

#10 Updated by laforge 10 months ago

  • Assignee deleted (lynxis)

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