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Bug #3002

HO2: handover decision for dynamic timeslots

Added by neels 5 months ago. Updated about 2 months ago.

Status:
New
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
02/26/2018
Due date:
% Done:

0%

Estimated time:
Spec Reference:

Description

The recent handover_decision_2.c hasn't been duly tested in the presence of dynamic timeslots.
Particularly TCH/F_TCH/H_PDCH timeslots are potentially both TCH/F or TCH/H, which might require another spin on the handover_decision_2.c code.


Related issues

Related to OsmoBSC - Feature #1606: hand-over for load distribution among BTSsStalled2016-02-23

Related to OsmoBSC - Feature #1608: hand-over betwen TCH/H and TCH/F during call based on load / qualityStalled2016-02-23

Blocked by Cellular Network Infrastructure - Bug #2963: Measurement Reports cease to be useful some time into a voice call / after handover (not sure which project has the bug / bugs yet)Resolved2018-02-19

History

#1 Updated by neels 5 months ago

  • Blocked by Bug #2963: Measurement Reports cease to be useful some time into a voice call / after handover (not sure which project has the bug / bugs yet) added

#2 Updated by neels 5 months ago

(need to get useful measurement reports to be able to test this properly, hence blocked-by #2963)

#3 Updated by neels 5 months ago

  • Related to Feature #1606: hand-over for load distribution among BTSs added

#4 Updated by laforge 4 months ago

  • Assignee set to neels

#5 Updated by neels about 2 months ago

Aspects to consider:

It is benificial if PDCH are in consecutive timeslots.
  • If dynamic timeslots are in use, it makes sense to trigger re-assignment to move them as far away from dedicated PDCH as possible.
  • If a dedicated TCH timeslot becomes available, it makes sense to re-assign away from a dyn TS towards a dedicated timeslot.

An unused dynamic timeslot may count as both 1 free TCH/F and 2 free TCH/H. If one TCH/H becomes used, this implicitly also reduces the number of free TCH/F. The lchan picking algorithm must not get confused by that.

A dynamic timeslot being available as PDCH is benificial to GPRS service. So, if a neighboring cell is unloaded and has good rxlev, we may want to handover away from dynamic timeslots to make room for PDCH. rxlev vs PDCH tradeoff should be configurable.

#6 Updated by neels about 2 months ago

  • Related to Feature #1608: hand-over betwen TCH/H and TCH/F during call based on load / quality added

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