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TR 23.820 (CT4)
Study of
IMS Restoration Procedures

use "3GPP‑Page" to get the Word version
for a better overview, the Table of Contents (ToC) is reproduced
V9.0.0 (Wzip)  2009/09  43 p.
V8.0.1  2008/12  42 p.

Rapporteur:  Mr. Blanco, German

This TR identifies the changes required in the 3GPP IMS specifications so that a consistent state is restored in the IMS Core Network, after, or during a planned, or unplanned stop of a network element.

full Table of Contents for  TR 23.820  Word version:   9.0.0


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1  ScopeWord-p. 6
2  References
3  Definitions, symbols and abbreviations
4  Requirements analysis and assumptions
5  Service Interruption scenarios
6  Alternative solutions
6.1  Backup of S-CSCF Information in the HSSUp
6.2  Triggering of initial registration from the S-CSCF or P-CSCFWord-p. 25
6.2A  Precautionary de-registration of un-registered usersWord-p. 28
6.2B  S-CSCF re-assignment for unregistered user
6.3  Second P-CSCF and deregistration from S-CSCF
6.4  Monitoring P-CSCF HealthWord-p. 31
6.5  Possible Solution for SIP-AS Service RestorationWord-p. 34
6.6  Update of S-CSCF Name in the HSS after Loss of DataWord-p. 35
6.7  Forking Service RestorationWord-p. 37
6.8  Possible Solutions for SIP-AS Service RestorationWord-p. 38
6.9  AS Behaviour After HSS RecoveryWord-p. 39
6.10  HSS Failover with no loss of serviceWord-p. 40
7  Conclusions and recommendations
A  Change historyWord-p. 43

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