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Content for  TR 23.730  Word version:  14.0.0

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5  Key Issuesp. 10

5.1  Key Issue 1 - Authorization of use of Coverage Enhancementp. 10

5.2  Key Issue 2 - Reliable communication service between UE and SCEFp. 11

5.3  Key Issue 3 - Inter RAT idle mode mobility to/from NB-IoTp. 11

5.4  Key Issue 4 - Reuse of existing multicast/broadcast architecturep. 13

5.5  Key Issue 5 - Reuse of Location Services architecture for Control Plane CIoT EPS optimizationp. 14

5.6  Key Issue 6 - Inter UE QoS for NB-IoT Control Plane Optimisationp. 17

5.7  Key Issue 7 - CN overload control for data transfer via Control Plane EPS CIoT Optimizationp. 17

6  Solutionsp. 18

6.1  Solution 1 - Authorization of Coverage Enhancements using Enhanced Coverage Allowed parameter in HSSp. 18

6.2  Solution 2: Solution for Authorization of use of Coverage Enhancement - UE configurationp. 22

6.3  Solution 3: Subscription based authorization via NASp. 23

6.4  Solution 4: Subscription based authorization via S1p. 25

6.5  Solution 5 - Reliable communication service between UE and SCEFp. 27

6.6  Solution 6: Inter RAT idle mode mobility to/from NB-IoTp. 33

6.7  Solution 7: Inter UE QoS for NB-IoT Control Plane Optimisation using spare codepoints in Message 3p. 36

6.8  Solution 8 - Back-off timer for data transmission via control planep. 37

6.9  Solution 9 - Overload Start message for control plane data onlyp. 39

6.10  Solution 10 - Enabling and Disabling the Reliable Communication Service between UE and SCEFp. 41

6.11  Solution 11 - Reuse of GROUPE for multicast/broadcast of NIDDp. 43

6.12  Solution 12 - Ensuring UE availability for MBMS receptionp. 45

6.13  Solution 13 - for Key Issue 5 on Reuse of Location Services architecture for Control Plane CIoT EPS optimizationp. 47

6.14  Solution 14 - Inter UE QoS for NB-IoT Control Plane Optimisation using a UE context in the eNBp. 56

6.15  Solution 15: Inter UE QoS for NB-IoT Control Plane Optimisation by retrieving the UE context from the MMEp. 59

6.16  Solution 16: Avoid UE sending WB-E-UTRAN capabilities when camping on NB-IoTp. 60

6.17  Solution 17: MBMS reuse with Power Saving functions via potential independent wake up for MBMS user servicep. 66

6.18  Solution 18: Coverage enhancement for positioningp. 71

7  Overall Evaluationp. 75

8  Conclusionsp. 81

$  Change Historyp. 83


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