huawei eran3.0 drx feature introduction
DESCRIPTION
DRXTRANSCRIPT
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
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《 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
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5
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
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 6
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
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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
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DRX basic concepts and principles - DRX timers operation (1/5)
[(SFN * 10) + subframe number] modulo (longDRX-Cycle) = drxStartOffset,start onDurationTimer
On Duration timer
UE shall monitor PDCCH
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.
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the PDCCH indicates a new transmission
Start DRX Inactivity timer Restart DRX Inactivity timer
DRX Inactivity timer
On Duration timer
UE shall monitor PDCCH
0 1 2 3 4 5 6 7 8 9 0 1 2 37 8 9
DRXInactivityTimer
DRX basic concepts and principles - DRX timers operation (2/5)
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.
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346
the PDCCH indicates a new DL data transmission
As the PDCCH indicates a DL transmission,start the HARQ RTT timer
DRX Inactivity timer
On Duration timer
UE shall monitor PDCCH
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
DRX basic concepts and principles - DRX timers operation (3/5)
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.
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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.
DRX basic concepts and principles - DRX timers operation (4/5)
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the PDCCH indicates a new transmission
Start DRX Inactivity timer
DRX Inactivity timer On Duration timer
UE shall monitor PDCCH
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 basic concepts and principles - DRX timers operation (5/5)
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.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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.
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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
the PDCCH indicates a new transmission
Start or restart DRX Inactivity timer
DRX Inactivity timer On Duration timer
UE shall monitor PDCCH
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
DRX
When the drx-InactivityTimer expires,start the drxShortCycleTimer;
When the drxShortCycleTimer expires,the UE should enter the long cycle DRX
DRX Short CycleTimer
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
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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
DRX Inactivity timer On Duration timer
UE shall monitor PDCCH
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
DRXLong cycle DRX
When the DRX command MAC CE is received,stop on duration timer; stop DRX inactivity timer ;start or restart the drxShortCycleTimer;
When the drxShortCycleTimer expires,the UE should enter the long cycle DRX
DRX Short CycleTimer
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
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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
DRX Inactivity timer On Duration timer
UE shall monitor PDCCH
SR
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
Long cycle DRX
SR
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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
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the PDCCH indicates a new DL data transmission
As the PDCCH indicates a DL transmission,start the HARQ RTT timer
DRX Inactivity timer
On Duration timer
UE shall monitor PDCCH
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
DRX basic concepts and principles - DL data receiveing during DRX mode
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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.
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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
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 20
1 DRX basic concepts and principles
22 DRX key parametersDRX key parameters
3 Relation between DRX and others
4 DRX Feature Benefit and influence
5 DRX Feature deployment 、 Configuration and testability
Content
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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Key Parameters Introduction
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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
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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
MOD CELLDRXPARALST CELLDRXPARA
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
MOD CELLDRXPARALST CELLDRXPARA
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
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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)
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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
ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP
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
ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP
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
ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP
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)
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Key Parameters(4)
Parameter Name
MML Command Meaning Id GUI Value Range Recommended Value
Short DRX Cycle
ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP
Indicates the length of a short DRX cycle.
ShortDrxCycle
SF2(2 subframes), SF5(5 subframes), SF8(8 subframes), SF10(10 subframes), SF16(16 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)
QCI 4: SF5(5 subframes)QCI 6: SF5(5 subframes)QCI 8: SF5(5 subframes)QCI 9: SF5(5 subframes)
DRX Short Cycle Timer
ADD DRXPARAGROUPMOD DRXPARAGROUPLST DRXPARAGROUP
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)
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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), 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)
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)
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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
SF2(2 subframes), SF5(5 subframes), SF8(8 subframes), SF10(10 subframes), SF16(16 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)
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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1 DRX basic concepts and principles
2 DRX key parameters
3 Relation between DRX and others3 Relation between DRX and others
4 DRX Feature Benefit and influence
5 DRX Feature deployment 、 Configuration and testability
Content
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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
UE shall monitor PDCCH
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
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DRX VS.RACH&GAP
RACH take priority than DRX ; GAP take priority than DRX, even when measurement
configurations conflict with DRX configurations
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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
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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.
HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 33Page 33
1 DRX basic concepts and principles
2 DRX key parameters
3 Relation between DRX and others
4 DRX Feature Benefit and influence4 DRX Feature Benefit and influence
5 DRX Feature deployment 、 Configuration and testability
Content
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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.
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DRX Feature Benefit and influence
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1 DRX basic concepts and principles
2 DRX key parameters
3 Relation between DRX and others
4 DRX Feature Benefit and influence
5 DRX Feature deployment5 DRX Feature deployment 、 、 Configuration and testabilityConfiguration and testability
Content
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Setting DRX Parameters for Common UEs
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Setting DRX Parameters for Special UEs
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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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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
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Thank YouThank You