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TR 23.898
Access Class Barring and Overload Protection (ACBOP)

3GPP‑Page
V7.0.0 (Wzip)  2005/04  27 p.
Rapporteur:
Mr. Davidian, Jean-Jacques
DoCoMo Europe S.A.

full Table of Contents for  TR 23.898  Word version:  7.0.0

1Scope  p. 5
2References  p. 5
3Definitions, symbols and abbreviations  p. 6
3.1Definitions  p. 6
3.2Abbreviations  p. 6
4Congestion and Failure Scenarios  p. 6
4.1MSC/VLR or SGSN Congestion or Failure  p. 6
4.1.1Use case for domain specific access control  p. 6
4.1.2IMS and "IMS with Circuit Switched Bearers"  p. 7
4.1.3RRC connected mode DSAC  p. 7
4.1.4Restart following a failure  p. 7
4.1.5SGSN failure and Gs interface  p. 7
4.2MGW and/or voice transit network overload or failure  p. 7
4.3SS7 signalling network overload/failure  p. 8
4.4Terminating calls/events  p. 8
4.5HLR Overload/Failure  p. 9
4.6GGSN Overload/Failure  p. 9
4.7 Packet backbone (GTP-U or Gi) overload/failure  p. 9
4.8Wide area radio interface congestion causing RNC/BSC overload/failure  p. 9
4.9Cell level congestion/access for emergency services  p. 9
4.10Multiple RATs  p. 10
4.11Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes (Iu Flex)  p. 10
4.12Network Sharing  p. 10
4.13Handover into overloaded areas  p. 10
4.14MBMS point to point repair  p. 11
5Functional Requirements  p. 11
5.1General overview  p. 11
5.2Functional requirements for access control mechanisms.  p. 11
5.3Additional requirements  p. 12
6Potential Technical Solutions  p. 12
6.1Domain Specific Access Class Barring approach  p. 12
6.1.1Domain specific access restrictions (solution for requirement a)  p. 13
6.1.2Handling UEs/MSs in connected mode (requirement b)  p. 13
6.1.2.1Handling of UEs/MSs with dedicated channels (CELL_DCH)  p. 15
6.1.2.2Handling of existing signalling connection with assigned radio resources  p. 15
6.1.2.3Handling of cases where DRNC and SRNC are connected to different CN nodes  p. 16
6.1.2.4Handling UEs that missed ACR information changes  p. 16
6.1.3Domain Specific Access Control with Iu-flex (requirement a, i, l)  p. 16
6.1.4PS Domain Specific Access Restriction and Gs Interface (requirement j)  p. 17
6.1.4.1UE based solution  p. 17
6.1.4.2Network Operation Mode change (NMO change)  p. 18
6.1.4.3Preferred Solution  p. 18
6.1.5Successive removal of access class (solution for requirement c)  p. 19
6.2Service Specific Access Class Barring approach  p. 19
6.2.1Indication of SSACB  p. 19
6.2.2Realisation of SSACB in NAS  p. 19
6.3Handling overload situations by alternative solutions  p. 20
6.3.1RNC/BSC Overload (requirements d)  p. 20
6.3.2Cell Level Congestion and Allowing SMS and Emergency Calls (requirements d)  p. 20
6.3.3SS7 Signalling Network Overload/Failure (requirement e)  p. 20
6.3.4Overload Protection from Terminating Calls/Events (requirement f)  p. 20
6.3.5Overload Protection from Packet backbone (GTP-U or Gi) overload/failure (requirement h)  p. 21
6.4O&M Guidance  p. 21
6.4.1Node Specific Access Control (requirement i, l)  p. 21
7Conclusion  p. 21
AInterlayer primitives within the UE  p. 22
BImprovements to prevent/delay automatic re-establishment attempts (requirement g)  p. 24
B.1Classification of exiting GPRS/SMS specific cause value  p. 24
B.2Duration of wait timer and other configurations within MT  p. 25
CCombination of Access Class Control  p. 25
$Change history  p. 27

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