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Feature #2592

closed

Use "waiting time" of IMMEDIATE ASSIGN REJECT

Added by laforge over 6 years ago. Updated about 6 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
A-bis RSL
Target version:
-
Start date:
10/23/2017
Due date:
% Done:

0%

Spec Reference:

Description

When the BTS responds with an IMMEDIATE ASSIGN REJECT, it can specify a waiting time to the MS.

This waiting time should ideally be load-dependent, i.e. the higher the current load, the longer the waiting time before the MS sends another RACH request.

This is expected to help under severe RACH/SDCCH overload situations


Related issues

Related to OsmoBSC - Feature #2591: ramp up cell slowly based on access control class to avoid severe RACH/SDCCH overloadResolvedstsp10/23/2017

Actions
Related to OsmoBSC - Feature #1611: be more efficient in batching IMMEDIATE ASSIGN REJECT messagesRejectedstsp02/23/2016

Actions
Related to OsmoBSC - Feature #2722: document RACH tuning parameters more thoroughly, give explanationsResolveddaniel12/08/2017

Actions
Actions #1

Updated by laforge over 6 years ago

  • Related to Feature #2591: ramp up cell slowly based on access control class to avoid severe RACH/SDCCH overload added
Actions #2

Updated by laforge over 6 years ago

Timer T3122 is affected by the "wait indication" IE of the IMMEDIATE ASSIGN REJECT. It is coded as a single byte in units of seconds, i.e. up to 255 seconds of waiting time are possible to encode.

See 04.08 Chapters 10.5.2.43 and 9.1.20

Actions #3

Updated by laforge over 6 years ago

currently, we use a static value as configured in the VTY as T3122. The default value is 10 seconds.

Actions #4

Updated by laforge over 6 years ago

  • Related to Feature #1611: be more efficient in batching IMMEDIATE ASSIGN REJECT messages added
Actions #5

Updated by laforge over 6 years ago

  • Related to Feature #2722: document RACH tuning parameters more thoroughly, give explanations added
Actions #6

Updated by laforge over 6 years ago

  • Category set to A-bis RSL
Actions #7

Updated by laforge about 6 years ago

  • Assignee changed from 4368 to stsp
Actions #8

Updated by stsp about 6 years ago

  • Status changed from New to In Progress
Actions #9

Updated by stsp about 6 years ago

Initial patch proposed in https://gerrit.osmocom.org/#/c/6211/

Actions #10

Updated by stsp about 6 years ago

  • Status changed from In Progress to Resolved

Above patch has been merged.

Actions

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