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Content for TR 23.770 Word version: 13.0.0

1… 4…

4 Issues p. 7

4.1 Issues for Idle Mode DRX p. 7

4.2 Issues for Connected Mode DRX p. 7

4.3 Issues for RAN/GERAN p. 8

5 Solutions for Idle Mode DRX p. 8

5.1 Solutions to Idle Mode DRX Open Issue #1: Support NAS-protocol extensions to enable extended DRX cycle. p. 8

5.1.1 Solution #1: Extended DRX value assignment using NAS MM messages p. 8

5.1.1.1 Description p. 8

5.1.1.2 Impacts on existing nodes and functionality p. 10

5.1.1.3 Solution Evaluation p. 10

5.2 Solutions to Idle Mode DRX Open Issue #2: Paging strategy in CN that fits the needs of the extended DRX cycle and normal DRX cycle p. 10

5.2.1 Solution1: Paging coordination between CN and UE p. 10

5.2.1.1 Description p. 10

5.2.1.1a Solution details for UTRAN and LTE p. 11

5.2.1.1a.1 General p. 11

5.2.1.1a.2 Option 1: Synchronization with EMM/GMM Accept messages p. 12

5.2.1.1a.3 Option 2: Synchronization with an absolute clock reference p. 14

5.2.1.2 Impacts on existing nodes and functionality p. 14

5.2.1.3 Solution Evaluation p. 14

5.2.2 Solution 2: Paging Strategy Left to MME/SGSN Implementation p. 15

5.2.2.1 Description p. 15

5.2.2.2 Impacts on existing nodes and functionality p. 15

5.2.2.3 Solution Evaluation p. 15

5.3 Solutions to Idle Mode DRX Open Issue #3: Handling of MT SMS and MT location services, e.g. avoiding retransmissions for long DRX cycles p. 16

5.3.1 Solution #1: MME temporarily declare UE unreachable if MT SMS received p. 16

5.3.1.1 Description p. 16

5.3.1.2 Impacts on existing nodes and functionality p. 16

5.3.1.3 Solution Evaluation p. 16

5.4 Solutions to Idle Mode DRX Open Issue #4: Impact in S/P-GW retransmissions when handling Network originated control plane procedure p. 16

5.4.1 Solution 1: Cause code dependent solution for GTP-C re-transmissions p. 17

5.4.1.1 Description p. 17

5.4.1.2 Impacts on existing nodes and functionality p. 18

5.4.1.3 Solution Evaluation p. 18

5.4.2 Solution 2: Adjust GTP-C re-transmission timer according to eDRX p. 18

5.4.2.1 Description p. 18

5.4.2.2 Impacts on existing nodes and functionality p. 19

5.4.2.3 Solution Evaluation p. 20

5.5 Void

5.6 Solutions to Idle Mode DRX Open Issue #6: Interaction between eDRX and PSM (Power Saving Mode) p. 20

5.6.1 Solution 1: SGSN/MME decision on whether to enable both extended I-DRX and PSM or not p. 20

5.6.1.1 Description p. 20

5.6.1.2 Impacts on existing nodes and functionality p. 21

5.6.1.3 Solution Evaluation p. 21

5.7 Solutions to Idle Mode DRX Open Issue #7: MT location services p. 21

5.7.1 Solution 1: Delayed location reporting p. 21

5.7.1.1 Description p. 21

5.7.1.2 Impacts on existing nodes and functionality p. 22

5.7.1.3 Solution Evaluation p. 22

6 Solutions for Connected Mode DRX p. 22

6.1 Solutions to Connected Mode DRX Open Issue #1: How SGSN/MME is aware of GERAN/RAN enabling extended C-DRX, particularly for long DRX values p. 22

6.1.1 Solution 1: Configuration of extended C-DRX via Core Network p. 22

6.1.1.1 Description p. 22

6.1.1.2 Impacts on existing nodes and functionality p. 23

6.1.1.3 Solution Evaluation p. 24

6.2 Solutions to Connected Mode DRX Open Issue #2: Handling NAS retransmissions timers for DRX values longer than the currently specified values p. 24

6.2.1 Solution 1: NAS retransmission timer adjustment by C-DRX p. 24

6.2.1.1 Description p. 24

6.2.1.2 Impacts on existing nodes and functionality p. 24

6.2.1.3 Solution Evaluation p. 24

6.2.2 Solution 2: New ECM Connected substate while the UE is in long extended C-DRX p. 24

6.2.2.1 Description p. 24

6.2.2.2 Impacts on existing nodes and functionality p. 26

6.2.2.3 Solution Evaluation p. 26

6.3 Solutions to Connected Mode DRX Open Issue #3: Handling of MT SMS and MT location services, e.g. avoiding retransmissions for long DRX cycles p. 26

6.3.1 Solution 1: MME temporarily declares UE unreachable if MT SMS received p. 26

6.3.1.1 Description p. 26

6.3.1.2 Impacts on existing nodes and functionality p. 27

6.3.1.3 Solution Evaluation p. 27

6.3.2 Solution 2: MME/SGSN temporarily declares UE unreachable if MT SMS received - without RAN impacts p. 27

6.3.2.1 Description p. 27

6.3.2.2 Impacts on existing nodes and functionality p. 27

6.3.2.3 Solution Evaluation p. 28

6.4 Solutions to Connected Mode DRX Open Issue #4: Impact in S/P-GW retransmissions when handling Network originated control plane procedure p. 28

6.4.1 Solution 1: Cause code dependent solution for GTP-C re-transmissions p. 28

6.4.1.1 Description p. 28

6.4.1.2 Impacts on existing nodes and functionality p. 30

6.4.1.3 Solution Evaluation p. 30

6.4.2 Solution 2: Adjust GTP-C re-transmission timer according to eDRX p. 30

6.4.2.1 Description p. 30

6.4.2.2 Impacts on existing nodes and functionality p. 30

6.4.2.3 Solution Evaluation p. 31

7 Overall Evaluation p. 31

7.1 Overall Evaluation for Idle Mode DRX p. 31

7.2 Overall Evaluation for Connected Mode DRX p. 32

8 Conclusions p. 34

A Baseline from Rel-12 p. 36

A.1 Solution: Extended DRX in idle mode (TR 23.887 [4], clause 7.1.3.1) p. 36

A.1.1 General p. 36

A.1.2 Impacts on existing nodes and functionality p. 39

A.2 Solution: Long DRX cycles in connected mode (TR 23.887 [4], clause 7.1.3.6) p. 40

A.2.1 General p. 40

A.2.2 Impacts on existing nodes and functionality p. 40

$ Change History p. 42