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TR 23.843 (SA2)
Study on
Core Network Overload (CNO) solutions

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V12.0.0 (Wzip)    2013/12    48 p.

Rapporteur:  Mr. Schramm, Mirko
See also:  –

The present document investigates core network signalling overload scenarios and potential general handling solutions, in particular:
  • Identify and document events that have occurred and caused network disturbances due to signalling overload. In addition, identify and document scenarios that have high probability of occurrence in the 3GPP network, which may result in signalling overload for core network entities. Such scenarios/events may include HLR/HSS overload by RNC restart, denial of service attacks, and misbehaving/3GPP-non-compliant mobiles causing unpredictable system response;
  • Analyse the criticality of the scenarios and determine whether it is required to take actions for the identified scenarios;
  • Study ways to mitigate and/or eliminate the impact on the core network from signalling overload scenarios that are identified to be critical.
The information provided about the HSS/HLR overload will serve as a starting basis for the study. All currently deployed 3GPP networks should be covered in the study, including LTE.

The study should avoid overlap with other parallel activities within 3GPP, and work in close cooperation with the specific WG needs to be maintained.

During the study, if potential security threats such as denial of service attack scenarios are identified, SA WG3 must then be informed to take appropriate measures.


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1   Scope   Word-p. 7
2   References   Word-p. 8
3   Definitions and abbreviations
4   Scenarios and problem analysis for CNO   Word-p. 9
5   Architecture principles   Word-p. 14
6   Solutions targeting HLR/HSS overload handling   Word-p. 15

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