Content for TR 23.870 Word version: 9.0.0
6 Architecture Alternatives p. 7
6.1 Alternative 1 - SRVCC from E-UTRAN (or HSPA) to 3GPP 2/3G p. 7
6.1.1 General p. 7
6.1.2 Functional Entities p. 8
6.1.2.1 MSC Server enhanced for SRVCC p. 8
6.1.2.2 MME/SGSN p. 8
6.1.2.3 E-CSCF p. 8
6.1.2.4 E-SCC AS p. 9
6.1.2.5 SRVCC UE p. 9
6.1.3 Call flows p. 9
6.1.4 Support for UEs in Limited Service Mode p. 11
6.2 Alternative 2 - SRVCC from E-UTRAN to CDMA2000 1x p. 12
7 Assessment p. 13
8 Conclusion p. 13
$ Change history p. 14
