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TR 23.770 (SA2)
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
See also:  –

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. Also, basic assumptions may be done for each solution on GERAN/RAN aspects of extending DRX cycle.

The main goal is to identify which open issues remained from the Rel-12 study for extended Idle and Connected mode DRX as described in TR 23.887 (as documented in clause and of TR 23.887), document potential solutions and conclude on which feasible solutions would be adopted in core network (pending work in RAN regarding extension of DRX cycle).

No connected mode mobility enhancements for extended C-DRX are considered in this work, i.e., if a UE using extended C-DRX moves to a different cell, current connected mode mobility procedures apply.


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1  ScopeWord-p. 6
2  References
3  Definitions and abbreviations
4  Issues
5  Solutions for Idle Mode DRX
5.1  Solutions to Idle Mode DRX Open Issue #1: Support NAS-protocol extensions to enable extended DRX cycle.Up
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
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 procedure
5.6  Solutions to Idle Mode DRX Open Issue #6: Interaction between eDRX and PSM (Power Saving Mode)
5.7  Solutions to Idle Mode DRX Open Issue #7: MT location services

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