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TR 23.770SA2
Study on System impacts of
extended Discontinuous Reception (DRX) Cycle
for Power Consumption optimization

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V13.0.0 (Wzip)  2015/09  42 p.

Rapporteur:  Mr. Griot, Miguel

The present document studies the core network and NAS impacts in UE of extending DRX cycle for both idle mode and connected mode, solutions in the core network to support it, and interactions between GERAN/RAN and Core Network. extended C-DRX moves to a different cell, current connected mode mobility procedures apply.

full Table of Contents for  TR 23.770  Word version:   13.0.0

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1  ScopeWord-p. 6
2  ReferencesWord-p. 6
3  Definitions and abbreviationsWord-p. 6
4  IssuesWord-p. 7
4.1  Issues for Idle Mode DRXWord-p. 7
4.2  Issues for Connected Mode DRXWord-p. 7
4.3  Issues for RAN/GERANWord-p. 8
5  Solutions for Idle Mode DRXWord-p. 8
5.1  Solutions to Idle Mode DRX Open Issue #1: Support NAS-protocol extensions to enable extended DRX cycle.UpWord-p. 8
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 cycleWord-p. 10
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 cyclesWord-p. 16
5.4  Solutions to Idle Mode DRX Open Issue #4: Impact in S/P-GW retransmissions when handling Network originated control plane procedureWord-p. 16
5.5Void
5.6  Solutions to Idle Mode DRX Open Issue #6: Interaction between eDRX and PSM (Power Saving Mode)Word-p. 20
5.7  Solutions to Idle Mode DRX Open Issue #7: MT location servicesWord-p. 21
6  Solutions for Connected Mode DRXWord-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 valuesWord-p. 22
6.2  Solutions to Connected Mode DRX Open Issue #2: Handling NAS retransmissions timers for DRX values longer than the currently specified valuesWord-p. 24
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 cyclesWord-p. 26
6.4  Solutions to Connected Mode DRX Open Issue #4: Impact in S/P-GW retransmissions when handling Network originated control plane procedureWord-p. 28
7  Overall EvaluationWord-p. 31
7.1  Overall Evaluation for Idle Mode DRXWord-p. 31
7.2  Overall Evaluation for Connected Mode DRXWord-p. 32
8  ConclusionsWord-p. 34
A  Baseline from Rel-12Word-p. 36
A.1  Solution: Extended DRX in idle mode (TR 23.887 [4], clause 7.1.3.1)UpWord-p. 36
A.2  Solution: Long DRX cycles in connected mode (TR 23.887 [4], clause 7.1.3.6)Word-p. 40
B  Change historyWord-p. 42

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