TR 23.898
Access Class Barring and Overload Protection (ACBOP)
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
1 Scope p. 5
The present document studies 3GPP system enhancements e.g. CS or PS domain specific access control to cope with several network overload and failure situations. This feasibility study also identifies the potential technical solutions for UTRAN and GERAN access control and overload protection.
Clause 4 reviews the various congestion and node failure scenarios: these will be used to derive any new functional requirements.
Clause 5 identifies the new functional requirements.
Clause 6 contains a presentation of the potential technical solutions.
Clause 7 conclusion.
2 References p. 5
3 Definitions, symbols and abbreviations p. 6
3.1 Definitions p. 6
3.2 Abbreviations p. 6
4 Congestion and Failure Scenarios p. 6
4.1 MSC/VLR or SGSN Congestion or Failure p. 6
4.1.1 Use case for domain specific access control p. 6
4.1.2 IMS and "IMS with Circuit Switched Bearers" p. 7
4.1.3 RRC connected mode DSAC p. 7
4.1.4 Restart following a failure p. 7
4.1.5 SGSN failure and Gs interface p. 7
4.2 MGW and/or voice transit network overload or failure p. 7
4.3 SS7 signalling network overload/failure p. 8
4.4 Terminating calls/events p. 8
4.5 HLR Overload/Failure p. 9
4.6 GGSN Overload/Failure p. 9
4.7 Packet backbone (GTP-U or Gi) overload/failure p. 9
4.8 Wide area radio interface congestion causing RNC/BSC overload/failure p. 9
4.9 Cell level congestion/access for emergency services p. 9
4.10 Multiple RATs p. 10
4.11 Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes (Iu Flex) p. 10
4.12 Network Sharing p. 10
4.13 Handover into overloaded areas p. 10
4.14 MBMS point to point repair p. 11
5 Functional Requirements p. 11
5.1 General overview p. 11
5.2 Functional requirements for access control mechanisms. p. 11
5.3 Additional requirements p. 12
6 Potential Technical Solutions p. 12
6.1 Domain Specific Access Class Barring approach p. 12
6.1.1 Domain specific access restrictions (solution for requirement a) p. 13
6.1.2 Handling UEs/MSs in connected mode (requirement b) p. 13
6.1.2.1 Handling of UEs/MSs with dedicated channels (CELL_DCH) p. 15
6.1.2.2 Handling of existing signalling connection with assigned radio resources p. 15
6.1.2.3 Handling of cases where DRNC and SRNC are connected to different CN nodes p. 16
6.1.2.4 Handling UEs that missed ACR information changes p. 16
6.1.3 Domain Specific Access Control with Iu-flex (requirement a, i, l) p. 16
6.1.4 PS Domain Specific Access Restriction and Gs Interface (requirement j) p. 17
6.1.4.1 UE based solution p. 17
6.1.4.2 Network Operation Mode change (NMO change) p. 18
6.1.4.3 Preferred Solution p. 18
6.1.5 Successive removal of access class (solution for requirement c) p. 19
6.2 Service Specific Access Class Barring approach p. 19
6.3 Handling overload situations by alternative solutions p. 20
6.3.1 RNC/BSC Overload (requirements d) p. 20
6.3.2 Cell Level Congestion and Allowing SMS and Emergency Calls (requirements d) p. 20
6.3.3 SS7 Signalling Network Overload/Failure (requirement e) p. 20
6.3.4 Overload Protection from Terminating Calls/Events (requirement f) p. 20
6.3.5 Overload Protection from Packet backbone (GTP-U or Gi) overload/failure (requirement h) p. 21
6.4 O&M Guidance p. 21
7 Conclusion p. 21
A Interlayer primitives within the UE p. 22
B Improvements to prevent/delay automatic re-establishment attempts (requirement g) p. 24
B.1 Classification of exiting GPRS/SMS specific cause value p. 24
B.2 Duration of wait timer and other configurations within MT p. 25
C Combination of Access Class Control p. 25
$ Change history p. 27
