Content for TR 23.715 Word version: 16.0.0
5 Key Issues for EPC p. 8
5.1 Key Issue #EPC-1: Network indicating support for Restricted Local Operator Services and related UE behaviour p. 8
5.2 Key Issue #EPC-2: RLOS request indication p. 8
5.3 Key Issue #EPC-3: Support of unauthenticated UEs access to RLOS p. 8
5.4 Key Issue #EPC-4: Support of authenticated UEs access to RLOS p. 9
5.5 Void
5.6 Key Issue #EPC-6: Collection of charging information p. 9
5.7 Key Issue #EPC-7: Level of security p. 9
6 Key Issues for IMS p. 9
6.1 Key issue #IMS-1: Support for unauthenticated and authenticated user p. 9
6.2 Key issue #IMS-2: Identification of Restricted Local Operator Services at IMS layer p. 9
6.3 Key issue #IMS-3: Handling IMS session for Restricted Local Operator Service p. 10
6.4 Key issue #IMS-4: Support of emergency services by UEs attached for RLOS p. 10
7 Solutions p. 10
7.1 Solution #1: New SIB indicating support for Restricted Local Operator Services p. 10
7.1.1 Functional Description p. 10
7.1.2 Procedures p. 10
7.1.3 Impact on existing entities and interfaces p. 10
7.2 Solution #2: EPC attach/PDN connection for RLOS from unauthenticated/authenticated UE p. 11
7.2.1 Functional Description p. 11
7.2.2 Procedures p. 11
7.2.2.2 Detach procedure p. 12
7.2.3 Impact on existing entities and interfaces p. 12
7.3 Solution #3: IMS procedures for RLOS p. 12
7.3.1 Functional Description p. 12
7.3.2 Procedures p. 12
7.3.3 Impact on existing entities and interfaces p. 13
7.4 Solution #4: EPC solution using dedicated RLOS-APN p. 13
7.4.1 Functional Description p. 13
7.4.2 Procedures p. 15
7.4.2.1 Attach procedure p. 15
7.4.2.2 UE-initiated Detach procedure p. 17
7.4.2.3 MME-initiated Detach procedure p. 17
7.4.2.4 S1-based handover procedure p. 18
7.4.2.5 UE requested PDN connectivity p. 18
7.4.3 Impact on existing entities and interfaces p. 18
7.5 Solution #5: IMS solution with dedicated RLOS-APN and RLOS-specific P/S-CSCF p. 18
7.5.1 Functional Description p. 18
7.5.2 Procedures p. 19
7.5.2.1 IMS registration p. 19
7.5.2.2 Location Information retrieval p. 20
7.5.2.3 UE initiated RLOS IMS session establishment p. 20
7.5.3 Impact on existing entities and interfaces p. 21
7.6 Solution #6: Solution to key issue #EPC-3 & #EPC-4 to enable IMS calls after initial attachment p. 21
7.6.1 Functional Description p. 21
7.6.2 Procedures p. 22
7.6.3 Impact on existing entities and interfaces p. 22
7.7 Solution #7 to key issues #IMS-1, #IMS-2, and #IMS-3: IMS support for RLOS users p. 23
7.7.1 Functional Description p. 23
7.7.2 Procedures p. 24
7.7.3 Impact on existing entities and interfaces p. 24
7.8 Solution #8: Solution to key issues #IMS-4: Support of emergency services by UEs attached for RLOS p. 25
7.8.1 Functional Description p. 25
7.8.2 Procedures p. 25
7.8.2.1 UE performs detach from RLOS and then do emergency Attach p. 25
7.8.2.2 UE stays RLOS attached, and establishes emergency PDN connection p. 26
7.8.3 Impact on existing entities and interfaces p. 27
7.9 Solution #9: PLMN selection, radio access for RLOS and overload handling p. 27
7.9.1 Functional Description p. 27
7.9.2 Procedures p. 28
7.9.3 Impact on existing entities and interfaces p. 28
7.10 Solution #10: IMS solution with dedicated RLOS-APN and skipping IMS registration p. 28
7.10.1 Functional Description p. 28
7.10.2 Procedures p. 30
7.10.2.1 IMS registration p. 30
7.10.2.2 Location Information retrieval p. 30
7.10.2.3 UE initiated RLOS IMS session establishment p. 30
7.10.3 Impact on existing entities and interfaces p. 31
7.11 Solution #11: Partial security solution for key issue #EPC-7 p. 31
8 Evaluation p. 32
9 Conclusions p. 36
$ Change History p. 38
