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16.3.1 Conformance Test Aspects – Enhanced Uplink for cell_fach State in fdd uid_430024

UID

Name

Resource

Hyperlink

Status_Report

TS_TR

430024

Conformance Test Aspects – Enhanced Uplink for CELL_FACH State in FDD

R5

RP-090152

RP-100483

34.108, 34.121-1, 34.121-2, 34.123-1, 34.123-2, 34.123-3

16.4 Enhanced ue Discontinuous Reception (drx) for fdd uid_370038

Resources: R2

References

Document

Title/Contents

WID(s)

RP-070679

WID on Enhanced UE DRX for FDD

Impacted Specifications

TS 25.306

UE Radio Access capabilities

TS 25.308

High Speed Downlink Packet Access (HSDPA)

TS 25.321

Medium Access Control (MAC) protocol specification

TS 25.331

Radio Resource Control (RRC); Protocol specification

TS 25.423

UTRAN Iur interface Radio Network Subsystem Application(RNSAP) signalling

New Dedicated Specifications/Reports

-

-

Supporting Individual Members: Nokia, Nokia Siemens Networks, Qualcomm, LG Electronics, Philips, NXP.

UID

Name

Resource

Hyperlink

Status_Report

TS_TR

370038

Enhanced UE Discontinuous Reception (DRX) for FDD

R2

RP-070679

RP-080520

25.306, 25.308, 25.321, 25.331, 25.423

Rel-7 work item "Continuous connectivity for packet data users" UID_20046 (or "Continuous Packet Connectivity"), enhanced the efficiency of radio links when not actively transmitting data in either direction. This Rel-7 efficiency enhancement can be seen both in the system capacity as well in the UE battery consumption.

Rel-7 did not completely covered the support for frequent transmission of small packets due to IP applications keeping their connection alive by periodically sending a message to the network. Despite this type of application being considered in the WI on Enhanced CELL_FACH, where such packets lead to the UE moving to CELL_FACH state and later being explicitly moved back to the CELL/URA_PCH state, there was little consideration of the actual continuous reception activity in CELL_FACH when the packet exchange is rather infrequent. This causes unnecessary receiver activity before the UE can be moved away form the CELL_FACH state, which leads to reduced UE battery life. In addition, the signalling load is also further increased if the UE is kept in CELL_FACH for shorter periods. Therefore, minimizing the signalling needed to move the UE from CELL_FACH state was also considered.

Rel-7 didn't fully covered also taking to limits the discontinuous reception opportunities for the CELL_DCH state. Rel-7 provides a single DRX cycle that is activated if there is no data transmission to the UE over a given period. But having just a single DRX cycle does not allow the system to use anything more than very conservatively set DRX cycle lengths.

This work provides enhanced power saving mechanisms for UE and reduces the state transition related signalling load by introducing support for:

    • discontinuous reception scheme for CELL_FACH state

    • efficient state transition from CELL_FACH to CELL/URA_PCH state

    • enhanced DRX method to CELL_DCH state in addition to the one provided in Rel-7.

Complexity and backward compatibility were considered as well.

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