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Content for TR 23.863 Word version: 12.0.0

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4 Architecture Requirements and assumptions p. 8

4.1 General p. 8

4.2 MSISDN-less IMS UE - Server communication p. 8

4.3 Communication between MSISDN-less IMS UEs p. 8

4.4 MSISDN-less IMS UE - Traditional UE communication p. 8

5 Solution Alternatives p. 8

5.1 Server - MSISDN-less IMS UE communication via SMS p. 8

5.1.1 Server to MSISDN-less IMS UE p. 8

5.1.1.1 Alternative 1: Direct delivery without IP-SM-GW p. 8

5.1.1.1.1 Procedure p. 8

5.1.1.1.2 Affect / necessary changes in existing functionality p. 10

5.1.1.1.3 Applicability p. 10

5.1.1.1.4 Advantages, drawbacks p. 10

5.1.1.2 Alternative 2: Direct delivery with IP-SM-GW p. 10

5.1.1.2.1 Procedure p. 10

5.1.1.2.2 Affect / necessary changes in existing functionality p. 12

5.1.1.2.3 Applicability p. 12

5.1.1.2.4 Advantages / Drawbacks p. 12

5.1.1.3 Alternative 3: SMS delivery with modified IM-SMS interworking p. 12

5.1.1.3.1 Procedure p. 12

5.1.1.3.2 Affect / necessary changes in existing functionality p. 14

5.1.1.3.3 Applicability p. 14

5.1.1.3.4 Advantages / Drawbacks p. 15

5.1.1.4 Alternative 4: SMS delivery through SMS proxy p. 15

5.1.1.4.1 Procedure p. 15

5.1.1.4.2 Affect / necessary changes in existing functionality p. 16

5.1.1.4.3 Applicability p. 16

5.1.1.4.4 Evaluation p. 16

5.1.1.5 Alternative 5: Direct delivery with IP-SM-GW interworking p. 17

5.1.1.5.1 Procedure p. 17

5.1.1.5.2 Affect / necessary changes in existing functionality p. 18

5.1.1.5.3 Applicability p. 18

5.1.1.5.4 Evaluation p. 19

5.1.2 MSISDN-less IMS UE to Server p. 19

5.1.2.1 Alternative 1: Direct delivery with IP-SM-GW interworking p. 19

5.1.2.1.1 Procedure p. 19

5.1.2.1.2 Affect / necessary changes in existing functionality p. 20

5.1.2.1.3 Applicability p. 20

5.1.2.1.4 Evaluation p. 21

5.1.2.2 Alternative 2: SMS delivery through SMS proxy p. 21

5.1.2.2.1 Procedure p. 21

5.1.2.2.2 Affect / necessary changes in existing functionality p. 23

5.1.2.2.3 Applicability p. 23

5.1.2.2.4 Advantages, drawbacks p. 23

5.1.2.3 Alternative 3: SMS submit with direct delivery from originating IP-SM-GW p. 23

5.1.2.3.1 Procedure p. 23

5.1.2.3.2 Affect / necessary changes in existing functionality p. 25

5.1.2.3.3 Applicability p. 25

5.1.2.3.4 Advantages / Drawbacks p. 25

5.2 Communication via SMS between MSISDN-less IMS UEs p. 25

5.2.1 Alternative 1: Direct delivery with IP-SM-GW interworking p. 25

5.2.1.1 Procedure p. 25

5.2.1.2 Affect / necessary changes in existing functionality p. 27

5.2.1.3 Applicability p. 27

5.2.1.4 Evaluation p. 28

5.2.2 Alternative 2: Direct delivery with SIP level interworking I p. 28

5.2.2.1 Procedure p. 28

5.2.2.2 Affect / necessary changes in existing functionality p. 30

5.2.2.3 Applicability p. 30

5.2.2.4 Evaluation p. 30

5.2.3 Alternative 3: Direct delivery with SIP level interworking II p. 31

5.2.3.1 Procedure p. 31

5.2.3.2 The use of "Correlation ID" p. 32

5.2.3.3 Affect / necessary changes in existing functionality p. 33

5.2.3.4 Applicability p. 33

5.2.3.5 Evaluation p. 33

5.3 Communication via SMS between MSISDN-less IMS UE and Traditional UE p. 33

5.3.1 MSISDN-less IMS UE to Traditional UE p. 33

5.3.1.1 Alternative 1: Direct delivery with IP-SM-GW interworking p. 33

5.3.1.1.1 Procedure p. 33

5.3.1.1.2 Affect / necessary changes in existing functionality p. 35

5.3.1.1.3 Applicability p. 36

5.3.1.1.4 Evaluation p. 36

5.3.1.2 Alternative 2: Delivery with IP-SM-GW interworking to traditional UE p. 36

5.3.1.2.1 Procedure p. 36

5.3.1.2.2 Affect / necessary changes in existing functionality p. 37

5.3.1.2.3 Applicability p. 38

5.3.1.2.4 Evaluation p. 38

5.3.1.3 Alternative 3: MSISDN-less UE delivery SMS to traditional UE Only p. 38

5.3.1.3.1 Procedure p. 38

5.3.1.3.2 Affect / necessary changes in existing functionality p. 39

5.3.1.3.3 Applicability p. 39

5.3.1.3.4 Evaluation p. 39

5.3.2 Traditional UE to MSISDN-less IMS UE p. 39

5.3.2.1 Alternative 1: SMS Delivery through IP-SM-GW p. 39

5.3.2.1.1 Procedure p. 39

5.3.2.1.2 Affect / necessary changes in existing functionality p. 41

5.3.2.1.3 Applicability p. 41

5.3.2.1.4 Advantages, drawbacks p. 41

5.3.2.2 Alternative 2: SMS Delivery through specific Server p. 42

5.3.2.2.1 Procedure p. 42

5.3.2.2.2 Affect / necessary changes in existing functionality p. 44

5.3.2.2.3 Applicability p. 44

5.3.2.2.4 Advantages, drawbacks p. 44

5.3.2.3 Alternative 3: SMS Delivery through enhanced MSC/SGSN p. 45

5.3.2.3.1 Procedure p. 45

5.3.2.3.2 Affect / necessary changes in existing functionality p. 45

5.3.2.3.3 Applicability p. 45

5.3.2.3.4 Advantages, drawbacks p. 46

6 Key Issues p. 46

6.1 Key Issue1: Storage and redelivery of the SMS for transferring SMS from Server to MSISDN-less IMS UE p. 46

6.1.1 Description p. 46

6.1.2 Solution p. 46

6.1.2.1 Alternative 1: Forward the SMS to the SMS-SC p. 46

6.1.2.2 Alternative 2: Save the SMS in IP-SM-GW p. 48

6.1.2.3 Alternative 3: Reuse SMS SC in SIMTC approach p. 49

6.1.3 Evaluation p. 50

6.1.3.1 Evaluation for alternative 1 p. 50

6.1.3.2 Evaluation for alternative 2 p. 50

6.1.3.3 Evaluation for alternative 3 p. 50

6.2 Key Issue 2: Traditional UE replies SMS to MSISDN-less IMS UE p. 50

6.2.1 Description p. 50

6.2.2 Solution p. 50

6.2.2.1 Alternative 1: Generated the replied message by User p. 50

6.2.2.2 Alternative 2: Generated the replied message by UE p. 51

6.2.2.3 Alternative 3: Use special reply number p. 51

6.3 Key Issue 3: MSISDN-less UE's SIP URI in SMS payload p. 51

6.3.1 Description p. 51

6.3.2 Solution p. 52

6.3.2.1 General p. 52

6.3.2.2 Alternative 1: Included by IMS UE p. 52

6.3.2.3 Alternative 2: Inserted by IP-SM-GW p. 52

6.3.2.4 Alternative 3: Retrieved by IMS Server p. 52

6.3.3 Assessment p. 53

7 Alternatives Assessment and Conclusions p. 54

7.1 Assessment of Server - MSISDN-less IMS UE communication via SMS alternatives p. 54

7.2 Assessment of MSISDN-less IMS UE - Server communication via SMS alternatives p. 56

7.3 Assessment of SMS between MSISDN-less IMS UEs p. 57

7.4 Assessment SMS between MSISDN-less UE and Traditional UE p. 58

7.5 Conclusion p. 58

A Addressing in SMS p. 59

A.1 General p. 59

A.2 Special cases in service level interworking p. 62

$ Change history p. 68