Huawei eRAN3.0 DRX Feature Introduction

Apr. 2006

Node B Products of Huawei

Huawei eRAN3.0DRX Feature Introduction

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2

In this course, you will learn the following

contents:

DRX Feature Roadmap DRX basic concepts and principles 、 Key

parameters 、 relation with other features

and functions ； DRX Feature Benefit and influence DRX Feature deployment 、 Configuration

and Testability

Objective


《 DRX Feature Parameter

Description 》

《 LTE eRAN FDD&TDD 3.0 DRX function

design Description 》

Reference

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

eRAN2.1 eRAN3.0eRAN2.0

QCI based DRX• QCI based DRX

Switch• QCI based DRX

timers

Basic DRX operation

• Enter and exit trigger

• Support On duration timer, DRX Inactivity Timer, DRX Short Cycle Timer, DRX Retransmission Timer, HARQ RTT Timer,

• Switch between active time and sleep time

• Switch between long cycle and short cycle

Support Intra-RAT ANR using DRX

Support DRX for Special UEs

• Support UE capacity feedback

• SPID

DRX Enhancement:• Relation with pre-

allocation• Relation with

CQI/SRS• Relation with

Scheduler （ SPS/Dynamic Sceduler/SR/ANack ）

• Relation with RACH• Relation with

Handover• Relation with

measurement (GAP)

Support Inter-RAT ANR using DRX

Support DRX for VOIP

DRX Enhancement • Relation with TTI

Bundling• Relation with UL

timing based on DMRS

• Up to 80ms DRX cycle (in sync. Status)

Next Evolutions

DRX Optimization (Ph2)

• Up to 320ms DRX cycle (in sync. Status)

Dynamic DRX Optimization

• TBD

eRAN6.0

DRX Enhancement • Up to 160ms DRX

cycle (in sync. Status)

Dynamic DRX• Up to 2.56s DRX

cycle (in Unsync. Status)

• Sync. And Unsync. Status control based on UE history information

• RRC connection status control

• Dynamic switch between Sync. DRX And Unsync. DRX

Released

Planning

Planned

Huawei DRX Feature Roadmap


11 DRX basic concepts and principlesDRX basic concepts and principles

2 DRX key parameters

3 Relation between DRX and others

4 DRX Feature Benefit and influence

5 DRX Feature deployment 、 Configuration and testability

Content


1 DRX basic concepts and 1 DRX basic concepts and principlesprinciples

a) Basic DRX operation

- DRX timers operation

- Switching between active time and sleep time

- Switching between long cycle and short cycle

- DRX MAC CE related operation

- UL data sending during DRX mode

- DL data receiving during DRX mode -

b) Support ANR using DRX

c) Service based DRX

- VOIP service

- non-VOIP service

Content


DRX basic concepts and principles - Feature Introduction

DRX status ：• Active Time ： In active time, the UE turns on its receiver and monitors the PDCCH • Sleep Time ： In sleep time, the UE turns off its receiver and does not monitor the

PDCCH DRX Cycle ： A DRX cycle specifies the periodic repetition of the On Duration followed

by a possible period of inactivity ， A DRX cycle may be a long (LongDRXCycle) or short

cycle (ShortDRXCycle) ; drxStartOffset ： DRX start offset, the start of OnDurationTimer is decided by DRX

Cycle and drxStartOffset ； DRX timer ：

OnDurationTimer 、 DRXInactivityTimer 、 HARQRTTTimer 、 DRXRetransmissionTimer 、ShortDRXCycleTimer ；

PDCCH SubFrame ： For FDD UE operation, this represents any subframe; for TDD,

only downlink subframes and subframes including DwPTS

Page 7

UE shall monitor PDCCH

On Duration

DRX cycle

On Duration


DRX basic concepts and principles - DRX timers operation (1/5)

[(SFN * 10) + subframe number] modulo (longDRX-Cycle) = drxStartOffset,start onDurationTimer

On Duration timer


On duration

DRX cycle

[(SFN * 10) + subframe number] modulo (longDRX-Cycle) = drxStartOffset,start onDurationTimer

0 1 2 3 4 5 6 7 8 97 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3

OnDurationTimer

On Duration Timer

OnDurationTimer

Function This timer measures the time during which the UE monitors the PDCCH.

Start This timer starts at the first subframe of a DRX cycle. For details, see Note "Startup of a DRX Cycle."

Timing Timing is based on the number of consecutive PDCCH subframes.

Stop This timer stops after it expires or the UE receives a DRX command MAC control element (MCE).

Expire This timer stops. The UE enters the sleep time, no longer monitoring the PDCCH.


the PDCCH indicates a new transmission

Start DRX Inactivity timer Restart DRX Inactivity timer

DRX Inactivity timer

On Duration timer


0 1 2 3 4 5 6 7 8 9 0 1 2 37 8 9

DRXInactivityTimer


DRX Inactivity Timer

DRXInactivityTimer Function This timer measures the time during which the UE determines whether to extend its active time because of the arrival of new data.

This timer provides a reference for the UE to apply a short DRX cycle.

Start This timer starts or restarts when the UE successfully decodes a PDCCH indicating an initial UL grant or downlink (DL) user data for this UE.

Timing Timing is based on the number of consecutive PDCCH subframes.

Stop This timer stops after it expires or the UE receives the DRX command MCE.

Expire After this timer expires, the UE applies a short DRX cycle if the cycle is configured, and the DRX Short Cycle Timer starts or restarts. Alternatively, the UE applies the long DRX cycle if no short DRX cycle is configured.


346

the PDCCH indicates a new DL data transmission

As the PDCCH indicates a DL transmission,start the HARQ RTT timer


On Duration timer


the PDCCH indicates a DL data retransmission

if a HARQ RTT Timer expires in this subframe and the data in the soft buffer was not successfully decoded,then start the drx-RetransmissionTimer

if the PDCCH indicates a DL transmission,stop the drx-RetransmissionTimer

HARQ RTT timer

DRX Retransmission timer

a new transmission a retransmission NACK ACK

0 1 2 3 4 5 7 8 9 0 1 2 3 5 6 7 8 9 0 1 2 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 24 5 6 3 4 5 6 7

HARQRTTTimer 、 DRXRetransmissionTime

r


HARQ RTT Timer - Function This timer measures the minimum number of subframes before a DL HARQ retransmission arrives in the case of a packet error occurs. This timer is used to determine when to start the DRX Retransmission Timer.

Start This timer starts and the DRX Retransmission Timer stops at the subframe when there may be a possible semi-persistent DL data transmission or stops at the subframe when the UE learns by detecting the PDCCH that one of its HARQ processes has new subframes for DL transmission.


HARQRTTTimer 、 DRXRetransmissionTime

r

HARQ RTT Timer - Function This timer measures the minimum number of subframes before a DL HARQ retransmission arrives in the case of a packet error occurs. This timer is used to determine when to start the DRX Retransmission Timer.

Start This timer starts and the DRX Retransmission Timer stops at the subframe when there may be a possible semi-persistent DL data transmission or stops at the subframe when the UE learns by detecting the PDCCH that one of its HARQ processes has new subframes for DL transmission.

Timing Timing is based on the number of subframes.Stop This timer stops after it expires.Expire This timer stops. If the UE detects that DL data is received correctly, the UE takes no further action.

Otherwise, the DRX Retransmission Timer starts.

DRX Retransmission Timer

DRXReTxTimer Function This timer measures the time during which the UE waits for HARQ in active time. If this timer expires and the UE has not received the retransmitted data, the UE will not accept it.

Start When the HARQ RTT Timer expires, the DRX Retransmission Timer starts or restarts if the UE does not receive the acknowledgment (ACK) feedback of the corresponding DL data.

Timing Timing is based on the number of consecutive PDCCH subframes.Stop This timer stops if the UE receives the retransmission data before the timer expires.Expire This timer stops, and the UE takes no further action.




Start DRX Inactivity timer

DRX Inactivity timer On Duration timer


0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 2

Long cycle DRXShort cycle

DRXShort cycle

DRXShort cycle

DRXLong cycle DRX

When the drx-InactivityTimer expires,start the drxShortCycleTimer;

When the drxShortCycleTimer expires,the UE should enter the long cycle DRX

DRX Short CycleTimer

DRXShortCycleTimer


DRX Short Cycle Timer

DRXShortCycleTimer

Function This timer measures the lifetime of short DRX cycle, that is, the consecutive repetition times of short DRX cycle.

Start After the DRX Inactivity Timer expires, this timer starts or restarts if a short DRX cycle is configured.

After the UE receives the DRX command MCE, this timer starts or restarts if a short DRX cycle is configured.

The UE applies a short DRX cycle after the DRX Short Cycle Timer starts.Timing Timing is based on the repetition times of short DRX cycle.Stop This timer stops after it expires.Expire This timer stops, and the UE applies the long DRX cycle.


DRX basic concepts and principles - Switching between active time and sleep time

Switching between active time and sleep time is determined by DRX timers and service processes. Figure shows how the UE receiver in frequency division duplex (FDD) mode switches between active time and sleep time in various scenarios The active time shown in the green (bottom) plot of Figure combines the active time described in each of the other plots excluding the plot of HARQ RTT Timer.

Condition Meaning

OD A DRX cycle starts.IA A PDCCH indicating an initial UL or DL data transmission

is received.R The HARQ RTT Timer expires.SR A UL scheduling request is sent.UR A UL negative acknowledgment (NACK) is received, and

retransmission is required.RAR A non-contention-based random access response is

received.CR Msg3 is sent in a random access procedure.


eNodeB can assign both long and short DRX cycles (Option) to the UE, the UE applies only the long

or short DRX cycle at a time. If shortDRX-Cycle is configured, the value of longDRX-Cycle shall be a

multiple of the shortDRX-Cycle value .The UE can switch between the long and short DRX cycles:

- After the DRX Inactivity Timer expires or the UE receives the DRX command MCE from the eNodeB,

the UE leaves the long DRX cycle and enters a short DRX cycle;

- If the UE does not receive any new data for a period after entering a short DRX cycle, it switches

to a long DRX cycle, achieving lower power consumption: The period before the UE switches to a long

DRX cycle is called the lifetime of short DRX cycle. The lifetime is measured based on the repetition

times of short DRX cycle. The related timer is DRX Short Cycle Timer. The period is specified by the

DrxShortCycleTimer parameter. After the DRX Short Cycle Timer expires, the UE applies the long DRX

cycle


Start or restart DRX Inactivity timer



0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 2


DRX

When the drx-InactivityTimer expires,start the drxShortCycleTimer;



3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ......

Short cycle DRX

Long cycle DRX area Long cycle DRX areaShort cycle DRX area

DRX basic concepts and principles - Switching between long cycle and short cycle


DRX basic concepts and principles - DRX MAC CE related operation

the PDCCH indicates a new transmission,and a DRX command MAC CE is included when the DL data is transmitted



0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 2


DRXLong cycle DRX

When the DRX command MAC CE is received,stop on duration timer; stop DRX inactivity timer ;start or restart the drxShortCycleTimer;



If UE received DRX Command MAC CE,then ： Stop OnDurationTimer ； Stop DRXInactivityTimer ； If ShortDRXCycle is configured ， then start or restart DRXShortCycleTimer ， and

enter ShortCycleDRX ， else enter LongCycleDRX


DRX basic concepts and principles - UL data sending during DRX mode

In DRX mode, the UE sends an SR when there is data in the UE buffer. If the UE is

in sleep time, it immediately switches to active time and begins to monitor the

PDCCH ; The eNodeB enables resource scheduling (UL grant )for the UE only in active

time; HARQ takes priority over DRX. After a HARQ process starts, the UE immediately

switches to active time if it is in sleep time and receives HARQ feedback

346

the PDCCH indicates a new UL data transmission



SR


0 1 2 3 4 5 7 8 9 0 1 2 3 5 6 7 8 9 0 1 2 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 24 5 6 3 4 5 6 7

Long cycle DRX

SR


The eNodeB enables resource scheduling (DL Assignment )for the UE only in

active time ； HARQ takes priority over DRX. After a HARQ process starts, the UE

immediately switches to active time if it is in sleep time and sends HARQ

feedback HARQRTTtimer 、 DRXRetransmissionTimer ensuring DL data transfer is not

restricted by DRX status. Only when DRXRetransmissionTimer is set too

short can cause DL HARQ failure

346

the PDCCH indicates a new DL data transmission

As the PDCCH indicates a DL transmission,start the HARQ RTT timer


On Duration timer


the PDCCH indicates a DL data retransmission

if a HARQ RTT Timer expires in this subframe and the data in the soft buffer was not successfully decoded,then start the drx-RetransmissionTimer

if the PDCCH indicates a DL transmission,stop the drx-RetransmissionTimer

HARQ RTT timer

DRX Retransmission timer


0 1 2 3 4 5 7 8 9 0 1 2 3 5 6 7 8 9 0 1 2 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 24 5 6 3 4 5 6 7

DRX basic concepts and principles - DL data receiveing during DRX mode


Normal DRX

a special-DRX starting indication

Normal DRX

a special-DRX stopping indication

EXIT ANR DRX

EXIT ANR DRX

Normal DRX

Normal DRX

DRXcycle =320ms

Enter ANR DRX

Delay

网络侧

UE侧

DRXcycle=320ms

Support ANR using DRX

If an eNodeB receives a special-DRX starting indication during ANR measurements, the eNodeB configures or reconfigures a relatively large value of the long DRX cycle, during which UEs perform ANR measurements in the sleep time. If the eNodeB receives a special-DRX stopping indication, it restores the configuration.

If an eNodeB receives a special-DRX starting indication during ANR measurements, the eNodeB configures or reconfigures a relatively large value of the long DRX cycle, during which UEs perform ANR measurements in the sleep time. If the eNodeB receives a special-DRX stopping indication, it restores the configuration.


eNodeB DL PDCP

eNodeB DL MAC

eNodeB UL PDCP

eNodeB UL MAC

Talk spurts Silence period

Talk spurts

Talk spurts

Silence periodSilence period

DRX

UE UL APP

UE UL MAC

eNodeB DL MAC

SPS sechdule

Dynamic sechdule

eNodeB UL MAC

SPS sechdule

Dynamic sechdule

UE UL MAC SR

DRX On duration timer

DRX inactivity timer SR

PDCCH indicates a new DL transmission

PDCCH indicates a new UL transmission

Active DL SPS resource

Deactive DL SPS resource

Active UL SPS resource

Deactive UL SPS resource

Support DRX for VOIP

For VoIP services, a set of special DRX parameter settings are available for reducing UE power consumption while maintaining VoIP capacity


1 DRX basic concepts and principles

22 DRX key parametersDRX key parameters




Content


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Key Parameters Introduction

Page 21

DRX parameters for various scenarios

DRX Parameters for Common UEs DRX Parameters for Special UEs

DRX Parameters for ANR Measurements

VoIP Services Non-VoIP Services Intra-RAT Inter-RAT

LongDrxCycle LongDrxCycle LongDrxCycleSpecial

LongDrxCycleForAnr

LongDrxCycleForIratAnr

SupportShortDrx SupportShortDrx SupportShortDrxSpecial

N/A

N/A ShortDrxCycle ShortDrxCycleSpecial

N/A

N/A DRXShortCycleTimer DrxShortCycleTimerSpecial

N/A

OnDurationTimer OnDurationTimer OnDurationTimerSpecial

N/A

DrxInactivityTimer DrxInactivityTimer DRXInactivityTimerSpecial

N/A

DRXReTxTimer DRXReTxTimer DRXReTxTimer N/A

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 22

Key Parameters(1)

Parameter Name MML Command Meaning Id GUI Value Range

Recommended

Value

Local cell IDLST CELLDRXPARAMOD CELLDRXPARA

Indicates the local ID of the cell. It uniquely identifies a cell within a BS.

LocalCellId 0~17 None

FDD enter DRX threshold

MOD CELLDRXPARALST CELLDRXPARA

Indicates the threshold for UEs to enter DRX in the cell that operates in FDD mode. This threshold is used in the DRX algorithm. It is expressed as a proportion of the transmission time intervals (TTIs) with data transmission to the total TTIs. If the traffic volume at a UE is equal to or lower than this threshold, the eNodeB decides that the UE should retain its DRX state or enter DRX.

FddEnterDrxThd 0~999 300

FDD exit DRX threshold


Indicates the threshold for UEs to exit DRX in the cell that operates in FDD mode. This threshold is used in the DRX algorithm. It is expressed as a proportion of the transmission time intervals (TTIs) with data transmission to the total TTIs. If the traffic volume at a UE is equal to or higher than this threshold, the eNodeB decides that the UE should retain its non-DRX state or exit DRX.

FddExitDrxThd 1~1000 800

Data amount Statistic timer


Indicates the length of the UE traffic measurement period. The traffic volume of a UE during this period is measured. Based on the measurement result, the DRX algorithm decides whether the UE should enter or exit DRX.

DataAmountStatTimer

2~300 30


Key Parameters(2)

Parameter Name MML Command Meaning Id GUI Value RangeRecommended

Value

Local cell ID

ADD DRXPARAGROUPLST DRXPARAGROUPMOD DRXPARAGROUPRMV DRXPARAGROUP

Indicates the local ID of the cell. It uniquely identifies a cell within a BS.

LocalCellId

0~17 None

DRX parameter group ID

ADD DRXPARAGROUPLST DRXPARAGROUPMOD DRXPARAGROUPRMV DRXPARAGROUP

Indicates the ID of the DRX parameter group.

DrxParaGroupId

0~9 None

Enter DRX SwitchADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP

Indicates whether bearers to which the parameter group applies support DRX. The value ON indicates that the bearers support DRX. The value OFF indicates that the bearers do not support DRX. A UE can enter the DRX mode only when all bearers running on it support DRX.

EnterDrxSwitch

OFF(Off), ON(On)

QCI 1: ON(On)QCI 2: OFF(Off)QCI 3: OFF(Off)QCI 4: ON(On)QCI 5: OFF(Off)QCI 6: ON(On)QCI 7: OFF(Off)QCI 8: ON(On)QCI 9: ON(On)

On Duration TimerADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP

Indicates the length of the On Duration Timer. Due to the impact of CQI reporting intervals and SRS transmission intervals, the actual value of this parameter assigned to a UE may be larger than the configured value.

OnDurationTimer

PSF1(1 subframe), PSF2(2 subframes), PSF3(3 subframes), PSF4(4 subframes), PSF5(5 subframes), PSF6(6 subframes), PSF8(8 subframes), PSF10(10 subframes), PSF20(20 subframes), PSF30(30 subframes), PSF40(40 subframes), PSF50(50 subframes), PSF60(60 subframes), PSF80(80 subframes), PSF100(100 subframes), PSF200(200 subframes)

QCI 1-FDD: PSF10(10 subframes)QCI 4-FDD: PSF2(2 subframes)QCI 6-FDD: PSF2(2 subframes)QCI 8-FDD: PSF2(2 subframes)QCI 9-FDD: PSF2(2 subframes)


Key Parameters(3)

Parameter Name

MML Command Meaning Id GUI Value Range Recommended Value

DRX Inactivity Timer

ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP

Indicates the length of the DRX Inactivity Timer. If the value of this parameter is greater than the corresponding long Drx cycle, the eNodeB does not instruct UEs to enter DRX.

DrxInactivityTimer

PSF1(1 subframe), PSF2(2 subframes), PSF3(3 subframes), PSF4(4 subframes), PSF5(5 subframes), PSF6(6 subframes), PSF8(8 subframes), PSF10(10 subframes), PSF20(20 subframes), PSF30(30 subframes), PSF40(40 subframes), PSF50(50 subframes), PSF60(60 subframes), PSF80(80 subframes), PSF100(100 subframes), PSF200(200 subframes), PSF300(300 subframes), PSF500(500 subframes), PSF750(750 subframes), PSF1280(1280 subframes), PSF1920(1920 subframes), PSF2560(2560 subframes)

QCI 1-FDD: PSF3(3 subframes)QCI 4-FDD: PSF4(4 subframes)QCI 6-FDD: PSF3(3 subframes)QCI 8-FDD: PSF3(3 subframes)QCI 9-FDD: PSF3(3 subframes)

DRX Retransmission Timer


Indicates the length of the DRX Retransmission Timer.

DrxReTxTimer

sf1(1 subframe), sf2(2 subframes), sf4(4 subframes), sf6(6 subframes), sf8(8 subframes), sf16(16 subframes), sf24(24 subframes), sf33(33 subframes)

QCI 1: sf8(8 subframes)QCI 4: sf8(8 subframes)QCI 6: sf8(8 subframes)QCI 8: sf8(8 subframes)QCI 9: sf8(8 subframes)

Long DRX Cycle


Indicates the length of a long DRX cycle.

LongDrxCycle

SF10(10 subframes), SF20(20 subframes), SF32(32 subframes), SF40(40 subframes), SF64(64 subframes), SF80(80 subframes), SF128(128 subframes), SF160(160 subframes), SF256(256 subframes), SF320(320 subframes), SF512(512 subframes), SF640(640 subframes), SF1024(1024 subframes), SF1280(1280 subframes), SF2048(2048 subframes), SF2560(2560 subframes)

QCI 1: SF20(20 subframes)QCI 4: SF20(20 subframes)QCI 6: SF40(40 subframes)QCI 8: SF40(40 subframes)QCI 9: SF40(40 subframes)

Short-cycle DRX supported indication


Indicates whether short DRX cycles are enabled.

SupportShortDrx

UU_DISABLE(Disable), UU_ENABLE(Enable)

QCI 1: UU_DISABLE(Disable)QCI 4: UU_ENABLE(Enable)QCI 6: UU_ENABLE(Enable)QCI 8: UU_ENABLE(Enable)QCI 9: UU_ENABLE(Enable)


Key Parameters(4)

Parameter Name

MML Command Meaning Id GUI Value Range Recommended Value

Short DRX Cycle


Indicates the length of a short DRX cycle.

ShortDrxCycle


QCI 4: SF5(5 subframes)QCI 6: SF5(5 subframes)QCI 8: SF5(5 subframes)QCI 9: SF5(5 subframes)

DRX Short Cycle Timer


Indicates the length of the DRX Short Cycle Timer. If this parameter is set to 1, the length of this timer is one short DRX cycle. If this parameter is set to 2, the length of this timer is two short DRX cycles. If this parameter is set to a large value, a UE for which short DRX cycles are enabled stays in short-cycle DRX for a long time. For details, see 3GPP TS 36.321 5.7.

DrxShortCycleTimer

1~16

QCI 4: 2QCI 6: 8QCI 8: 8QCI 9: 8

DRX switchMOD DRXLST DRX

Indicates the DRX switch. DrxAlgSwitch OFF(Off), ON(On) OFF(Off)

Short-cycle DRX switch

MOD DRXLST DRX

Indicates whether to enable or disable short DRX cycles. Short DRX cycles reduce the traffic delay.

ShortDrxSwitch

OFF(Off), ON(On) ON(On)


Key Parameters(5)

Parameter Name

MML Command

Meaning Id GUI Value RangeRecommended Value

Special long DRX cycle

MOD DRXLST DRX

Indicates the length of a long DRX cycle that is applied only to non-power-saving UEs whose subscriber profile ID for RAT/frequency priority (RFSP) indexes are contained in the RFSP index set. Due to the impact of CQI reporting periods and SRS transmission periods, the actual value of this parameter assigned to a UE may be less than the configured value.

LongDrxCycleSpecial


SF10(10 subframes)

Special On Duration timer

MOD DRXLST DRX

Indicates the length of the On Duration Timer that applies only to non-power-saving UEs whose RFSP indexes are contained in the RFSP index set. For details about this timer, see 3GPP TS 36.321. Due to the impact of CQI reporting intervals and SRS transmission intervals, the actual value of this parameter assigned to a UE may be larger than the configured value.

OnDurationTimerSpecial

PSF1(1 subframe), PSF2(2 subframes), PSF3(3 subframes), PSF4(4 subframes), PSF5(5 subframes), PSF6(6 subframes), PSF8(8 subframes), PSF10(10 subframes), PSF20(20 subframes), PSF30(30 subframes), PSF40(40 subframes), PSF50(50 subframes), PSF60(60 subframes), PSF80(80 subframes), PSF100(100 subframes), PSF200(200 subframes)

PSF4(4 subframes)

Special DRX inactivity timer

MOD DRXLST DRX

Indicates the length of the DRX Inactivity Timer that applies only to non-power-saving UEs whose RFSP indexes are contained in the RFSP index set. For details about this timer, see 3GPP TS 36.321. If the value of this parameter is greater than that of LongDrxCycleSpecial, the eNodeB does not instruct a UE to enter DRX.

DrxInactivityTimerSpecial

PSF1(1 subframe), PSF2(2 subframes), PSF3(3 subframes), PSF4(4 subframes), PSF5(5 subframes), PSF6(6 subframes), PSF8(8 subframes), PSF10(10 subframes), PSF20(20 subframes), PSF30(30 subframes), PSF40(40 subframes), PSF50(50 subframes), PSF60(60 subframes), PSF80(80 subframes), PSF100(100 subframes), PSF200(200 subframes), PSF300(300 subframes), PSF500(500 subframes), PSF750(750 subframes), PSF1280(1280 subframes), PSF1920(1920 subframes), PSF2560(2560 subframes)

PSF5(5 subframes) for FDD

Special short-cycle DRX supported indication

MOD DRXLST DRX

Indicates whether to enable or disable short DRX cycles for non-power-saving UEs whose RFSP indexes are contained in the RFSP index set.

SupportShortDrxSpecial

UU_DISABLE(Disable), UU_ENABLE(Enable)UU_DISABLE(Disable)


Key Parameters(6)

Parameter Name

MML Command

Meaning Id GUI Value RangeRecommended Value

Special short DRX cycle

MOD DRXLST DRX

Indicates the length of a short DRX cycle that applies only to non-power-saving UEs whose RFSP indexes are contained in the RFSP index set.

ShortDrxCycleSpecial


SF10(10 subframes)

Special DRX short cycle timer

MOD DRXLST DRX

Indicates the length of the DRX Short Cycle Timer that applies only to non-power-saving UEs whose RFSP indexes are contained in the RFSP index set. The length of this timer is expressed in the number of short DRX cycles. If this parameter is set to 1, the length of this timer is one short DRX cycle. If this parameter is set to 2, the length of this timer is two short DRX cycles. For details, see 3GPP TS 36.321 5.7.

DrxShortCycleTimerSpecial

1~16 1

Long DRX Cycle for ANR

MOD DRXLST DRX

Indicates the long DRX cycle for intra-RAT ANR. If intra-RAT ANR is enabled, this parameter takes effect regardless of whether DRX is enabled.

LongDrxCycleForAnr

SF128(128 subframes), SF160(160 subframes), SF256(256 subframes), SF320(320 subframes), SF512(512 subframes), SF640(640 subframes), SF1024(1024 subframes), SF1280(1280 subframes), SF2048(2048 subframes), SF2560(2560 subframes)

SF320(320 subframes)

Long DRX Cycle for Inter-RAT ANR

MOD DRXLST DRX

Indicates the long DRX cycle for inter-RAT ANR. If inter-RAT ANR is enabled, this parameter is valid regardless of whether DRX is enabled.

LongDRXCycleforIRatAnr

SF128(128 subframes), SF160(160 subframes), SF256(256 subframes), SF320(320 subframes), SF512(512 subframes), SF640(640 subframes), SF1024(1024 subframes), SF1280(1280 subframes), SF2048(2048 subframes), SF2560(2560 subframes)

SF1280(1280 subframes)

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3 Relation between DRX and others3 Relation between DRX and others



Content


DRX VS.SRS&CQI

When not in Active Time, CQI/PMI/RI on PUCCH and SRS shall not be reported

For UEs complying with 3GPP Release 8, CQIs can be periodically measured and reported in active time in DRX mode.

For UEs complying with 3GPP Release 9, CQIs can be reported only in the On Duration. In DRX mode, SRS can be periodically

measured and reported only in active time of the UE;

346


DRX活动期可以发送CQI

0 1 2 3 4 5 7 8 9 0 1 2 3 5 6 7 8 9 0 1 2 4 5 6 7 8 9 0 1 2 3 4 5 6 77 8 9 8 9 0 1 24 5 6 3 4 5 6 7

DRX休眠期不可以发送CQI

DRX cycle=40ms

CQI cycle=5ms


DRX VS.RACH&GAP

RACH take priority than DRX ； GAP take priority than DRX, even when measurement

configurations conflict with DRX configurations


DRX vs. Sheduling

The eNodeB enables resource scheduling for the UE only in active time if no system information is delivered or no paging is performed.In DRX mode, the UE sends an SR when there is data in the UE buffer. If the UE is in sleep time, it immediately switches to active time and begins to monitor the PDCCH. Upon reception of a PDCCH message, the DRX Inactivity Timer starts. This ensures that the active time continues and the UE obtains resources.HARQ takes priority over DRX. After a HARQ process starts, the UE immediately switches to active time if it is in sleep time and sends/receives HARQ feedback


DRX vs.HO

In different stages of a handover, DRX functions in the following manners:When the handover process starts:After receiving an indication of accepting the handover decision, the source eNodeB sends the RRC Connection Reconfiguration message to instruct the UE to leave the DRX mode. If the UE is in sleep time, it will receive the message in active time in the next DRX cycle.If the handover succeeds:The UE cannot use the DRX feature if the DRX feature is deactivated on the target eNodeB. If the handover fails:The UE remains in the current cell, and the source eNodeB checks whether the UE can enter the DRX mode.





4 DRX Feature Benefit and influence4 DRX Feature Benefit and influence


Content


DRX Feature Benefit and influence

Compared with continuous reception, DRX has the following advantages:In DRX mode, the UE does not need to continuously monitor the physical downlink control channel (PDCCH). As a result, power consumption is reduced, and battery runtime is prolonged. As an intermediate state between the RRC_CONNECTED and RRC_IDLE modes, DRX reduces the probability of transitions from RRC_CONNECTED to RRC_IDLE. This helps reduce signaling overhead of a network, especially a network with a large number of smart UEs.UEs can perform automatic neighbor relation (ANR) measurements during the sleep time in DRX.Impact on the Network:A over-small value of the OnDurationTimer parameter results in lower VoIP capacity. A over-large value of the LongDrxCycle parameter prolongs the SRS reporting period and therefore deteriorates UL synchronization performance.A large value of the LongDrxCycle parameter prolongs the CQI reporting period and therefore a decrease in the throughput under functions such as scheduling and multiple-input multiple-output (MIMO). A short sleep time in DRX has a negative impact on ANR measurements.


DRX Feature Benefit and influence






5 DRX Feature deployment5 DRX Feature deployment 、、 Configuration and testabilityConfiguration and testability

Content


Setting DRX Parameters for Common UEs


Setting DRX Parameters for Special UEs


Setting DRX Parameters for ANR Measurement s





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Testability (1)If DRX is enabled, the handover performance of UEs in the DRX state can be monitored by checking the counters:





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Testability (1)If DRX is enabled, the handover performance of UEs in the DRX state can be monitored by checking the counters:





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1. DRX Feature Benefit ？ What kind of DRX timers are mentioned ？

2. How DRX cycle Switched between long and short ？3. When UE is in active time? How DRX status Switched between

active time and sleep time ？4. How to Sett DRX Parameters for Special UEs ？5. How to configure DRX for ANR measurement?

问题





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Page 44

置方

DRX is a mechanism for UE power consumption ， UE DRX status is control by network between active time and sleep time

DRX cycles are switched between long and short to balance service delay and power saving

DRX mechanism is the basic of ANR

Suitable DRX parameters can improve UE stand-by time significant without big influence of service QoS (Objective)

…

Conclusion


Thank YouThank You

Documents

Huawei eRAN3.0 DRX Feature Introduction