Content for TR 23.730 Word version: 14.0.0
5 Key Issues p. 10
5.1 Key Issue 1 - Authorization of use of Coverage Enhancement p. 10
5.1.1 Description p. 10
5.1.2 Architectural Requirements p. 10
5.2 Key Issue 2 - Reliable communication service between UE and SCEF p. 11
5.2.1 Description p. 11
5.2.2 Architectural Requirements p. 11
5.3 Key Issue 3 - Inter RAT idle mode mobility to/from NB-IoT p. 11
5.3.1 Description p. 11
5.3.1.1 Introduction p. 11
5.3.1.2 Example Use cases for inter-RAT idle mode mobility p. 11
5.3.1.2.1 WB-E-UTRAN to NB-IoT p. 11
5.3.1.2.2 NB-IoT to WB-E-UTRAN p. 12
5.3.1.2.3 NB-IoT to GPRS/EC-GSM-IoT p. 12
5.3.1.2.4 GPRS/EC-GSM-IoT to NB-IoT p. 12
5.3.1.3 Description of problem(s) p. 12
5.3.2 Architectural Requirements p. 13
5.4 Key Issue 4 - Reuse of existing multicast/broadcast architecture p. 13
5.4.1 Description p. 13
5.4.2 Architectural Requirements p. 14
5.5 Key Issue 5 - Reuse of Location Services architecture for Control Plane CIoT EPS optimization p. 14
5.5.1 Description p. 14
5.5.2 Sub Issue 5.1 - eDRX and Power Saving Mode (PSM) p. 14
5.5.3 Sub Issue 5.2 - Last Known Location p. 14
5.5.4 Sub Issue 5.3 - Deferred Location p. 15
5.5.5 Sub Issue 5.4 - Triggered and Periodic Location p. 15
5.5.6 Sub-Issue 5.5 - UE Positioning p. 15
5.5.7 Sub-Issue 5.6 - UE Positioning Interaction for NB-IoT p. 16
5.5.8 Sub-Issue 5.7 - Security for NB-IoT p. 16
5.5.9 Sub-issue 5.8 - Message size adaptation according to coverage level p. 16
5.6 Key Issue 6 - Inter UE QoS for NB-IoT Control Plane Optimisation p. 17
5.6.1 Description p. 17
5.6.2 Architectural Requirements p. 17
5.7 Key Issue 7 - CN overload control for data transfer via Control Plane EPS CIoT Optimization p. 17
5.7.1 Description p. 17
5.7.2 Architectural Requirements p. 17
6 Solutions p. 18
6.1 Solution 1 - Authorization of Coverage Enhancements using Enhanced Coverage Allowed parameter in HSS p. 18
6.1.1 Description p. 18
6.1.1.1 General p. 18
6.1.1.2 Enhanced Coverage Allowed indication to the UE p. 18
6.1.1.3 Enhanced Coverage Allowed indication to the eNB p. 19
6.1.1.4 Control of enhanced coverage by 3rd party service provider p. 19
6.1.2 Impacts on existing nodes and functionality p. 21
6.1.3 Solution Evaluation p. 22
6.2 Solution 2: Solution for Authorization of use of Coverage Enhancement - UE configuration p. 22
6.2.1 Description p. 22
6.2.1.1 General p. 22
6.2.1.2 Procedure p. 22
6.2.2 Impacts on existing nodes and functionality p. 22
6.2.3 Solution Evaluation p. 23
6.3 Solution 3: Subscription based authorization via NAS p. 23
6.3.1 Description p. 23
6.3.1.1 General p. 23
6.3.1.2 Procedure p. 23
6.3.2 Impacts on existing nodes and functionality p. 25
6.3.3 Solution Evaluation p. 25
6.4 Solution 4: Subscription based authorization via S1 p. 25
6.4.1 Description p. 25
6.4.1.1 General p. 25
6.4.1.2 Procedure p. 26
6.4.2 Impacts on existing nodes and functionality p. 26
6.4.3 Solution Evaluation p. 27
6.5 Solution 5 - Reliable communication service between UE and SCEF p. 27
6.5.1 Description p. 27
6.5.1.1 General p. 27
6.5.1.2 Alternative 5a: Based on UE - SCEF acknowledgment p. 27
6.5.1.2.1 Option 1: new transport protocol p. 27
6.5.1.2.2 Option 2: MQTT-SN used as transport protocol p. 27
6.5.1.2.3 Option 3: CoAP used as transport protocol p. 29
6.5.1.3 Alternative 5b: Based on UE - MME and MME - SCEF acknowledgment p. 30
6.5.1.4 Alternative 5c: Based on hop by hop acknowledgment p. 31
6.5.1.5 Alternative 5d - Based on S1AP NAS NON DELIVERY INDICATION procedure p. 31
6.5.2 Impacts on existing nodes and functionality p. 32
6.5.2.1 Alternative 5a p. 32
6.5.2.2 Alternative 5b p. 32
6.5.2.3 Alternative 5c p. 32
6.5.2.4 Alternative 5d p. 32
6.5.3 Solution Evaluation p. 32
6.6 Solution 6: Inter RAT idle mode mobility to/from NB-IoT p. 33
6.6.1 Description p. 33
6.6.2 Impacts on existing nodes and functionality p. 35
6.6.3 Solution Evaluation p. 35
6.7 Solution 7: Inter UE QoS for NB-IoT Control Plane Optimisation using spare codepoints in Message 3 p. 36
6.7.1 Description p. 36
6.7.2 Impacts on existing nodes and functionality p. 36
6.7.3 Solution Evaluation p. 37
6.8 Solution 8 - Back-off timer for data transmission via control plane p. 37
6.8.1 Description p. 37
6.8.1.1 General p. 37
6.8.1.2 Control Plane data back-off timer during Attach/TAU procedure p. 37
6.8.1.3 Control Plane data back-off timer during Control Plane Service Request p. 38
6.8.1.4 UE behaviour while Control Plane data back-off timer is running p. 39
6.8.2 Impacts on existing nodes and functionality p. 39
6.8.3 Solution Evaluation p. 39
6.9 Solution 9 - Overload Start message for control plane data only p. 39
6.9.1 Description p. 39
6.9.2 Impacts on existing nodes and functionality p. 40
6.9.3 Solution Evaluation p. 41
6.10 Solution 10 - Enabling and Disabling the Reliable Communication Service between UE and SCEF p. 41
6.10.1 Description p. 41
6.10.1.1 General p. 41
6.10.1.2 Alternative 10a: Static PDN Configuration p. 41
6.10.1.3 Alternative 10b: PDN Configuration set at PDN Connection Establishment by the UE p. 41
6.10.1.4 Alternative 10c: PDN Configuration set at PDN Connection Establishment by the SCEF p. 42
6.10.2 Impacts on existing nodes and functionality p. 42
6.10.2.2 Alternative 10a: Static PDN Configuration p. 42
6.10.2.3 Alternative 10b: PDN Configuration at PDN Connection Establishment by the UE p. 42
6.10.2.4 Alternative 10c: PDN Configuration at PDN Connection Establishment by the SCEF p. 43
6.10.3 Solution Evaluation p. 43
6.11 Solution 11 - Reuse of GROUPE for multicast/broadcast of NIDD p. 43
6.11.1 Description p. 43
6.11.1.1 General p. 43
6.11.1.2 Procedure p. 44
6.11.2 Impact on existing nodes and functionality p. 45
6.11.3 Solution Evaluation p. 45
6.12 Solution 12 - Ensuring UE availability for MBMS reception p. 45
6.12.1 Description p. 45
6.12.1.1 General p. 45
6.12.1.2 Procedure p. 45
6.12.2 Impacts on existing nodes and functionality p. 46
6.12.3 Solution Evaluation p. 47
6.13 Solution 13 - for Key Issue 5 on Reuse of Location Services architecture for Control Plane CIoT EPS optimization p. 47
6.13.1 Solution for sub-issue 5.1 - eDRX and Power Saving Mode (PSM) p. 47
6.13.1.1 Description p. 47
6.13.2 Solution for sub-issue 5.2 - Last Known Location p. 48
6.13.2.1 Description p. 48
6.13.3 Solution for sub-issue 5.3 - Deferred Location p. 49
6.13.3.1 Description p. 49
6.13.4 Solution for sub-issue 5.4 - Triggered and Periodic Location p. 51
6.13.4.1 Description p. 51
6.13.5 Solution for sub-issue 5.5 - UE Positioning p. 52
6.13.5.1 Description p. 52
6.13.6 Solution for sub-issue 5.6 - UE Positioning Interaction for NB-IoT p. 53
6.13.6.1 Description p. 53
6.13.7 Solution for sub-issue 5.7 - Security for NB-IoT p. 54
6.13.7.1 Description p. 54
6.14 Solution 14 - Inter UE QoS for NB-IoT Control Plane Optimisation using a UE context in the eNB p. 56
6.14.1 Description p. 56
6.14.2 Impacts on existing nodes and functionality p. 58
6.14.3 Solution Evaluation p. 58
6.15 Solution 15: Inter UE QoS for NB-IoT Control Plane Optimisation by retrieving the UE context from the MME p. 59
6.15.1 Description p. 59
6.15.2 Impacts on existing nodes and functionality p. 59
6.15.3 Solution Evaluation p. 59
6.16 Solution 16: Avoid UE sending WB-E-UTRAN capabilities when camping on NB-IoT p. 60
6.16.1 Description p. 60
6.16.1.1 General p. 60
6.16.1.2 Option 1: Handling of UE capabilities in RAN, transparent to MME p. 60
6.16.1.2.1 Description p. 60
6.16.1.2.2 Impacts p. 61
6.16.1.3 Option 2: Handling of UE capabilities with MME knowledge keeping one UE Radio Capability set p. 61
6.16.1.3.1 Description p. 61
6.16.1.3.2 Impacts p. 62
6.16.1.4 Option 3: Handling of UE capabilities with MME knowledge keeping separate UE Radio Capability sets p. 62
6.16.1.4.1 Description p. 62
6.16.1.4.2 Impacts p. 63
6.16.1.5 Option 4: UE-based by indicating "UE radio capability update" p. 63
6.16.1.5.1 Description p. 63
6.16.1.5.2 Impacts p. 64
6.16.1.6 Option 5: MME stores two sets of UE Radio Capability and provides both to ENB p. 64
6.16.1.6.1 Description p. 64
6.16.1.6.2 Impacts p. 64
6.16.2 Impacts on existing nodes and functionality p. 65
6.16.3 Solution Evaluation p. 65
6.17 Solution 17: MBMS reuse with Power Saving functions via potential independent wake up for MBMS user service p. 66
6.17.1 Description p. 66
6.17.1.1 General p. 66
6.17.1.2 Option 1: Event-based wake up with Service announcement reception before start of MBMS Broadcast session p. 66
6.17.1.3 Option 2: Repeated Content Broadcast Transmission p. 67
6.17.1.4 Option 3: Periodic wake ups for potential service announcement/data reception of MBMS user service. p. 68
6.17.2 Impacts on existing nodes and functionality p. 69
6.17.3 Solution Evaluation p. 70
6.18 Solution 18: Coverage enhancement for positioning p. 71
6.18.1 Description p. 71
6.18.1.1 General p. 71
6.18.1.2 Option 1: eNB proactively transmits CEL to MME, which, in turn, relays it to E-SMLC p. 71
6.18.1.3 Option 2: MME requests CEL from eNB and relays it to E-SMLC p. 72
6.18.1.4 Option 3: E-SMLC requests CEL to UE (LPP based) p. 73
6.18.2 Impacts on existing nodes and functionality p. 74
6.18.3 Solution Evaluation p. 74
7 Overall Evaluation p. 75
7.1 Key Issue 1 - Authorization of use of Coverage Enhancements p. 75
7.2 Key Issue 2 - Reliable communication service between the UE and SCEF p. 75
7.3 Key Issue 3 - Inter RAT idle mode mobility to/from NB-IoT p. 76
7.4 Key Issue 4 - Reuse of existing multicast/broadcast architecture p. 76
7.5 Key Issue 5 - Reuse of Location Services architecture for Control Plane CIoT EPS optimization p. 78
7.6 Key Issue 6 - Inter UE QoS for NB-IoT Control Plane Optimisation p. 79
7.7 Key Issue 7 - CN overload control for data transfer via Control Plane EPS CIoT Optimization p. 79
8 Conclusions p. 81
8.1 Key Issue 1 - Authorization of use of Coverage Enhancements p. 81
8.2 Key Issue 2 - Reliable communication service between the UE and SCEF p. 81
8.3 Key Issue 3 - Inter RAT idle mode mobility to/from NB-IoT p. 81
8.4 Key Issue 4 - Reuse of existing multicast/broadcast architecture p. 81
8.5 Key Issue 5 - Reuse of Location Services architecture for Control Plane CIoT EPS optimization p. 81
8.6 Key Issue 6 - Inter UE QoS for NB-IoT Control Plane Optimisation p. 82
8.7 Key Issue 7 - CN overload control for data transfer via Control Plane EPS CIoT Optimization p. 82
$ Change History p. 83
