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TR 29.806 (CT4)
Study on IMS Proxy Call Session Control Function (P-CSCF) restoration procedures

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V12.1.0 (Wzip)    2015/01    62 p.

Rapporteur:  Ms. Bartolome, Maria-Cruz
See also:  –

The present document analyses existing P-CSCF restoration mechanism limitations and drawbacks, as defined by TS 23.380 and TS 24.229, and proposes alternative solutions that could minimize such limitations.

Expected output from this document is a proposal of an enhanced P-CSCF restoration mechanism.


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1   Scope   Word-p. 7
2   References
3   Abbreviations
4   Existing restoration procedures   Word-p. 8
5   Objectives   Word-p. 15
6   Solution alternatives   Word-p. 16
6.1   Introduction      Up
6.2   Sol-A: Double IMS registration
6.3   Sol-B: Alternative P-CSCF and PCRF based restoration
6.4   Sol-C: Alternative with AS (via ISC and Sh)
6.5   Sol-D: Alternative with direct Cx communication   Word-p. 32
6.6   P-CSCF restart case   Word-p. 43
7   Conclusions   Word-p. 45
7.1   Comparison analysis
7.2   Final conclusion   Word-p. 56
A   Solution D extension for non-3GPP access   Word-p. 58
B   Change history   Word-p. 61

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