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draft-TR 23.772 (SA2)
Enhanced Circuit Switched (CS) fallback

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(W-zip) V1.0.0    2014/12    44 p.


Rapporteur:  group chairman
See also:  CSFB-related TS/TR    


The present document studies enhancements for CSFB in the interest of shortening the call setup time. Based on the technical analysis, any needed enhancements/updates to 3GPP functions and interfaces are identified.

There shall be no UE impact.

Normative specifications may be developed based on the conclusions of the present document.


 

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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations   Word-p. 7
4   Architectural Requirements
5   Solutions   Word-p. 8
5.1   Solution #1: SRVCC based eCSFB Solution
5.2   Solution #2: SRVCC based eCSFB Solution with proper CS resource allocation   Word-p. 14
5.3   Solution #3: Enabling target cell(s) system information provision
5.4   Solution #4: UE radio capabilities consideration during PLMN and RAT selection
5.5   Solution #5: Optimised CSFB Procedure
5.6   Solution #6: SRVCC based eCSFB Solution with IMS-#I
5.7   Solution #7: CS security key derivation for CSFB
5.8   Overall evaluation   Word-p. 37
6   Conclusions
A   Possible CSFB optimisations
B   Specification changes required for UE radio capabilities consideration during PLMN and RAT selection solution   Word-p. 38
C   Change history   Word-p. 44

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