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Content for TR 23.729 Word version: 15.0.0

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4 Key Issues p. 7

4.1 Key Issue #1: Unlicensed spectrum identification handling in EPS p. 7

4.2 Key Issue #2: Unlicensed spectrum identification handling for IMS p. 7

4.3 Key Issue #3: Unlicensed data usage reporting activation/deactivation p. 8

4.4 Key Issue #4: Unlicensed spectrum data usage reporting mechanisms p. 8

4.5 Key Issue #5: Secondary RAT Restriction feature handling in EPS p. 8

4.6 Key Issue #6: Unlicensed spectrum charging handling p. 8

5 Architectural Requirements p. 9

6 Solutions p. 9

6.1 Solution #1: Use of Bearer RAT type IE per bearer for unlicensed spectrum identification p. 9

6.1.1 Description p. 9

6.1.2 Impacts on existing nodes and functionality p. 11

6.1.3 Solution Evaluation p. 11

6.2 Solution #2: Reporting of secondary RAT p. 11

6.2.1 Description p. 11

6.2.2 Impacts on existing nodes and functionality p. 12

6.2.3 Solution Evaluation p. 13

6.3 Solution #3: Capability indication from RAN p. 13

6.3.1 Description p. 13

6.3.2 Impacts on existing nodes and functionality p. 13

6.3.3 Solution Evaluation p. 13

6.4 Solution #4: Capability indication from RAN p. 14

6.4.1 Description p. 14

6.4.2 Impacts on existing nodes and functionality p. 15

6.4.3 Solution Evaluation p. 15

6.5 Solution #5: Unlicensed data usage reporting activation/deactivation taking node capability into account p. 15

6.5.1 Description p. 15

6.5.2 Impacts on existing nodes and functionality p. 16

6.5.3 Solution Evaluation p. 17

6.6 Solution #6: uplink marking and downlink counters in RAN p. 17

6.6.1 Description p. 17

6.6.1.1 General p. 17

6.6.1.2 Procedures6.6.1.2.1 Initial Attach p. 19

6.2.1.2.2 UE requested PDN connectivity p. 21

6.2.1.2.3 Dedicated bearer activation p. 22

6.2.1.2.4 S1-based handover p. 24

6.2.1.2.5 S1 release procedure p. 25

6.2.1.2.6 UE or MME requested PDN Disconnection p. 26

6.6.2 Impacts on existing nodes and functionality p. 27

6.6.3 Solution Evaluation p. 28

6.7 Solution #7: Enforce Secondary RAT Restriction at the eNB p. 28

6.7.1 Description p. 28

6.7.2 Impacts on existing nodes and functionality p. 30

6.7.3 Solution Evaluation p. 30

6.8 Solution #8: Data volume collection and reporting from RAN p. 30

6.8.1 Description p. 30

6.8.1.1 RAN accounting and reporting of data volume transmitted over primary and secondary cells. p. 31

6.8.1.1.1 Accounting of data volumes p. 31

6.8.1.2 Reporting of data volumes p. 31

6.8.1.2.1 Reporting of data volume to the SGW via the MME p. 31

6.8.2 Impacts on existing nodes and functionality p. 32

6.8.3 Solution Evaluation p. 32

6.9 Solution #9: Data Usage Reporting and the reporting mechanisms p. 33

6.9.1 Description p. 33

6.9.2 Impacts on existing nodes and functionality p. 34

6.9.3 Solution Evaluation p. 34

6.10 Solution#10 for Key Issue #6: Unlicensed spectrum handling in PCC p. 35

6.10.1 Description p. 35

6.10.2 Impacts on existing nodes and functionality p. 35

6.10.3 Solution Evaluation p. 35

6.11 Solution #11: Secondary RAT identification and Secondary RAT data usage reporting (merge of solutions 4 and 8) p. 35

6.11.1 Description p. 35

6.11.1.1 Reporting of data volume to the SGW via the MME p. 35

6.11.2 Impacts on existing nodes and functionality p. 36

6.11.3 Solution Evaluation p. 36

7 Overall Evaluation p. 37

8 Conclusions p. 37

$ Change History p. 38