9 wcdma ran12 dccc algorithm and parameters issue1.00

www.huawei.com

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA DCCC Algorithm and

Parameters

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page3

Foreword

Rate control triggers rate decrease, rate increase, or

handover according to the resource consumption

conditions to ensure the QoS, maintain system stability,

and improve system capacity

Rate control in the WCDMA system is applicable to the

following services:

Adaptive Multi Rate (AMR) services

Adaptive Multi Rate - Wideband (AMR-WB) services

Best Effort (BE) services

Video Phone (VP) services


References

3GPP TS 25.331: Radio Resource Control (RRC)

3GPP TS 25.413: UTRAN Iu interface RANAP

signalling

3GPP TS 25.415: UTRAN Iu interface user plane

protocols

3GPP TS 25.433: UTRAN Iub interface NBAP

signalling


Objectives

Upon completion of this course, you will be able to:

Explain the principle of DCCC

Describe the realization method of DCCC

Perform the parameter adjustment of DCCC


Contents

1. DCCC Overview

2. DCCC Based on Traffic Volume

3. DCCC Based on Throughput

4. DCCC Based on Link Stability

5. DCCC Based on Basic Congestion

6. UE State Transition

7. Service Release Due to the Absence of Data


Contents

1. DCCC Overview








DCCC Description

DCCC: Dynamic Channel Configuration Control

DCCC allocates dynamically resources according to

the service request and system load. So, DCCC is an

effective method to increase the radio resource

utilization efficiency

The UL DCCC algorithm and the DL DCCC algorithm

work independently


Parameters of DCCC

DraSwitch-DRA_DCCC_SWITCH

Parameter name: Dynamic resource allocation switch

for DCCC function

Recommended value: ON

UlDcccRateThd/DlDcccRateThd

Parameter name: Uplink/Downlink Bit Rate Threshold

For DCCC

Recommended value: 64kbit/s, 64kbit/s


Contents

1. DCCC Overview








Contents


2.1 Traffic Volume Measurement and Event Reporting

2.2 Rate Adjustment Based on Traffic Volume

2.3 Signaling Procedure


Traffic Volume Measurement Item In the uplink, the UE measures Dedicated Traffic

Channel (DTCH), (that is, buffer usage of RLC

entities), to obtain the uplink traffic volume

In the downlink, the RNC measures the DTCH, (that

is, buffer usage of RLC entities), to obtain the

downlink traffic volume


Traffic Volume Measurement Event Event 4a:

Traffic volume is above a threshold for a period of time

Event 4b:

Traffic volumes is below a threshold for a period of

time


Event 4a

Event 4a triggered by an increase in the transport

channel traffic volume:


Event 4b

Event 4b triggered by a decrease in the transport

channel traffic volume:


Parameters of Traffic Volume

Parameter Parameter NameRecommend

edValue in UL

Recommended

Value in DL

Event4aThdTraffic Measurement

Event 4A threshold 1024bytes 1024bytes

TimetoTrigger4A Time to trigger 4A 240ms 240ms

PendingTime4A

Pending time after

trigger 4A 4000ms 4000ms

Event4bThdTraffic Measurement

Event 4B threshold None None

TimetoTrigger4B Time to trigger 4B 2560ms 2560ms

PendingTime4B

Pending time after

trigger 4B 4000ms 4000ms

Recommended values of event 4a and event 4b:


Contents

2. Rate Reallocation Based on Traffic Volume





Rate Adjustment Strategy

In Huawei implementation, two strategies are

available for DCH rate adjustment based on traffic

volume:

RATE_UP_AND_DOWN_ON_DCH

RATE_UP_ONLY_ON_DCH

DcccStg

Parameter name: DCCC strategy

Recommended value: RATE_UP_AND_DOWN_ON_DCH


Rate Adjustment Strategy in UL Principles of RATE_UP_AND_DOWN_ON_DCH in UL:

Rate upsizing is performed if the RNC receives a report

of event 4a about the uplink traffic volume

Rate downsizing is performed if the RNC receives a

report of event 4b about the uplink traffic volume


Rate Adjustment Strategy in UL (Cont.) Principles of RATE_UP_ONLY_ON_DCH in UL:


of event 4a about the uplink traffic volume

Rate downsizing is prohibited. If a UE is in low activity,

the state of the UE is directly transited to CELL_FACH if

the UE state transition algorithm is enabled


UL Rate Increase Procedure If the UL rate increase level is 2_Rates and the current

rate is below the UlDcccRateThd, the current rate is increased to the UlDcccRateThd. If the current rate is above or equal to the UlDcccRateThd and lower than the MBR, the current rate is increased to the MBR

If the UL rate increase level is 3_Rates and the current rate is below the UlDcccRateThd, the rate is increased to the UlDcccRateThd. If the current rate is equal to the UlDcccRateThd, the current rate is increased to the UL middle rate threshold and then to the MBR. If the current rate is lower than the MBR but higher than the UlDcccRateThd, the current rate is increased to the MBR


UL Rate Decrease Procedure

If the UL rate decrease level is 2_Rates, the rate is

decreased directly to the UlDcccRateThd

If the UL rate decrease level is 3_Rates and the

current rate is the MBR, the current rate is

decreased to the UL middle rate threshold and then

to the UlDcccRateThd. If the current rate is lower

than the MBR but higher than the UlDcccRateThd,

the current rate is decreased to the UlDcccRateThd


Example of UL Rate Adjustment Rate adjustment when the UL rate increase and

decrease level are 2_Rates:


Example of UL Rate Adjustment (Cont.) Rate adjustment when the UL rate increase and

decrease level are 3_Rates:


Parameters of Traffic Volume (Cont.) UlRateUpAdjLevel

Parameter name: Uplink Rate Increase Adjust Level

Recommended value: 3_Rates

UlRateDnAdjLevel

Parameter name: Uplink Rate Decrease Adjust Level



Parameters of Traffic Volume (Cont.) UlMidRateCalc

Parameter name: Uplink Mid Bit Rate Calculate Method

Recommended value: HAND_APPOINT

UlMidRateThd

Parameter name: Uplink Mid Bit Rate Threshold

Recommended value: D128, namely 128kbit/s


Rate Adjustment Strategy in DL Principles of RATE_UP_AND_DOWN_ON_DCH in DL:


of event 4a about the downlink traffic volume

Rate downsizing is performed if the RNC receives a

report of event 4b about the downlink traffic volume


Rate Adjustment Strategy in DL (Cont.) Principles of RATE_UP_ONLY_ON_DCH in DL:


of event 4a about the downlink traffic volume

Rate downsizing is prohibited. If a UE is in low activity,

the state of the UE is directly transited to CELL_FACH if

the UE state transition algorithm is enabled


DL Rate Increase Procedure If the DL rate increase level is 2_Rates and the current

rate is below the DlDcccRateThd, the current rate is increased to the DlDcccRateThd. If the current rate is above or equal to the DlDcccRateThd and lower than the MBR, the current rate is increased to the MBR

If the DL rate increase level is 3_Rates and the current rate is below the DlDcccRateThd, the rate is increased to the DlDcccRateThd. If the current rate is equal to the DlDcccRateThd, the current rate is increased to the DL middle rate threshold and then to the MBR. If the current rate is lower than the MBR but higher than the DlDcccRateThd, the current rate is increased to the MBR


DL Rate Decrease Procedure

If the DL rate decrease level is 2_Rates, the rate is

decreased directly to the DlDcccRateThd

If the DL rate decrease level is 3_Rates and the

current rate is the MBR, the current rate is

decreased to the DL middle rate threshold and then

to the DlDcccRateThd. If the current rate is lower

than the MBR but higher than the DlDcccRateThd,

the current rate is decreased to the DlDcccRateThd


Parameters of Traffic Volume (Cont.) DlRateUpAdjLevel

Parameter name: Downlink Rate Increase Adjust Level


DlRateDnAdjLevel

Parameter name: Downlink Rate Decrease Adjust Level



Parameters of Traffic Volume (Cont.) DlMidRateCalc

Parameter name: Downlink Mid Bit Rate Calculate

Method

Recommended value: HAND_APPOINT

DlMidRateThd

Parameter name: Downlink Mid Bit Rate Threshold



Contents

2. Rate Reallocation Based on Traffic Volume





Signaling Procedure

Signaling procedure of UL rate upsizing based on

traffic volume:


Signaling Procedure (Cont.)

Signaling procedure of UL rate downsizing based on

traffic volume:



Signaling procedure of DL rate upsizing based on

traffic volume:



Signaling procedure of DL rate downsizing based on

traffic volume:


Contents

1. DCCC Overview








Contents


3.1 Throughput Measurement and Event Reporting

3.2 Rate Adjustment Based on Throughput



Throughput Measurement Item In each measurement period, the MAC-d measures

the traffic volume of radio bearers (RBs). Then, it

divides the measurement result by the measurement

period to obtain the throughput

To enable throughput-based rate adjustment on the

DCH, set the subparameter THROU_DCCC_SWITCH of

the parameter CfgSwitch to ON

To enable throughput-based rate adjustment for HSUPA,

set the subparameter DRA_HSUPA_DCCC_SWITCH of the

parameter DraSwitch to ON


Throughput Measurement Event Event 4a:

Throughput is above a threshold for a period of time

Event 4b:

Throughput is below a threshold for a period of time


Throughput Measurement Event (Cont.) Mechanism of measuring the throughput and

reporting events 4a and 4b:


Rate Adjustment Set

Compared with R99 service, HSUPA can support higher bit

rate. Usually there is big gap between maximum and

minimum bit rate. To utilize the rate adjustment

effectively, some middle bit rate levels and associated

thresholds need to be added. We call all the bit rates and

thresholds as a “Rate Adjustment Set”, just like {(Rmin,

TRmin), (R1, TR1 ), …, (Rmax,TRmax)}

If the subscribed MBR is bigger than Rmin, the DCCC

algorithm is on. Otherwise, the DCCC algorithm will not

work


Threshold for Triggering Events 4a/4b In the aspect of DCCC for HSUPA service:

The threshold of 4a is the throughput threshold

associated with the current HSUPA adjustment rate, that

is, TRt

TRt = Rt * (threshold rate ratio)t

The threshold of 4b is the throughput threshold

associated with the latest HSUPA adjustment rate, that

is, TRt–1

TRt–1 = Rt–1 * (threshold rate ratio)t–1


Threshold for Triggering Events 4a/4b (Cont.) In the aspect of DCCC for DCH service:

The threshold of 4b is the throughput threshold

associated with the latest DCH adjustment rate, that is,

TRt–1

TRt–1 = Rt–1 * (threshold rate ratio)t–1


Parameters of Throughput

DraSwitch-DRA_HSUPA_DCCC_SWITCH


for HSUPA DCCC function

Recommended value: ON

CfgSwitch-THROU_DCCC_SWITCH


for throughput-based DCCC function

Recommended value: OFF


Parameters of Throughput (Cont.) E2FThrouMeasPeriod

Parameter name: E-DCH Throu Meas Period

Recommended value: 30, namely 300ms

DchThrouMeasPeriod

Parameter name: DCH Throu Meas Period



Parameters of Throughput (Cont.)

Service

TypeParameter Parameter Name

Recommended

Value in UL/DL

HSUPA

EdchTimetoTrigger4A Period Amount to trigger 4A on EDCH

2, none

EdchPendingTime4A Period Amount after trigger 4A on EDCH

16, none

EdchTimetoTrigger4B Period Amount to trigger 4B on EDCH

2, none

EdchPendingTime4B Period Amount after trigger 4B on EDCH

16, none

DCH

DchThrouTimetoTrigger4B

Period Amount to trigger 4B on DCH

2, 2

DchThrouPendingTime4B

Period Amount after trigger 4B on DCH

16, 16

Recommended values of event 4a and event 4b:


Parameters of Throughput (Cont.) EdchRateAdjustSet

Parameter name: HSUPA UpLink Rate Adjust Set

Recommended value:

RATE_8KBPS-0, RATE_16KBPS-0, RATE_32KBPS-0,




RATE_5740KBPS-0


Parameters of Throughput (Cont.) E2FThrouThd

Parameter name: E-DCH2F 4B Threshold

Recommended value: 8, namely 8kbit/s


Contents






Rate Adjustment Strategy

In Huawei implementation, two strategies are

available for EDCH rate adjustment based on

throughput:

RATE_UP_AND_DOWN_ON_EDCH

RATE_UP_ONLY_ON_EDCH

For DCH rate adjustment based on throughput, only

rate downsizing is applicable


Parameters of Throughput (Cont.) HsupaDcccStg

Parameter name: HSUPA DCCC Strategy

Recommended value: RATE_UP_AND_DOWN_ON_EDCH


Rate Adjustment Procedure for EDCH Principles of RATE_UP_AND_DOWN_ON_EDCH:

After a report on event 4a is received, the rate is increased

by one level, that is, from Rt to Rt+1. If the current rate is the

MBR, no action is required

After a report on event 4b is received, the rate is decreased

to a rate that is close to the corresponding throughput. If the

reported throughput is TR and TRi–1 < TR < TRi, then the RB

adjustment rate is Ri


Rate Adjustment Procedure for EDCH (Cont.) Principles of RATE_UP_ONLY_ON_EDCH:

After a report on event 4a is received, the rate is

increased by one level, that is, from Rt to Rt+1. If the

current rate is the MBR, no action is required

After a report on event 4b is received, rate decrease is

not performed. Instead, state transition is performed

according to the principles described in section 6 "UE

State Transition"


Rate Adjustment Procedure for DCH After a report on event 4b is received, the rate is

decreased to a rate that is close to the

corresponding throughput. If the reported

throughput is TR and TRi–1 < TR < TRi, then the RB

adjustment rate is Ri

The above process applies to both uplink and

downlink


Contents

3. Rate Reallocation Based on Throughput





Signaling Procedure

Signaling procedure of rate increase based on

throughput:



Signaling procedure of rate decrease based on

throughput:


Contents

1. DCCC Overview








Contents


4.1 Uplink Stability Measurement and Event Reporting

4.2 Downlink Stability Measurement and Event Reporting

4.3 Rate Adjustment Based on Uplink Stability

4.4 Rate Adjustment Based on Downlink Stability



Uplink Stability Measurement Item UL stability measurement involves two

measurement items: UL TX power of the UE and UL

BLER

The UL TX power of the UE is measured on the Uu

interface. If the UL TX power reaches the maximum

power, you can infer that the radio link is unstable

The UL BLER is measured by the RNC. If the UL BLER is

excessively high, you can infer that the radio link is

unstable


Uplink Stability Measurement Event UL TX power of the UE:

Event 6A (6A1/6A2): The UE TX power is above a certain

threshold for a period of time

Event 6B (6B1/6B2): The UE TX power is below a certain

threshold for a period of time

Event 6D: The UE TX power is equal to the maximum allowed

TX power for a period of time

UL BLER:

Event 5A: The number of error blocks during the sliding

window is greater than or equal to a predefined number


Parameters of Link Stability

BeUlEvTrigInd

Parameter name: Indicator For BE Uplink QOS Event

Recommended value: SINGLE


Parameters of Link Stability (Cont.) BeUlQos6A1McSwitch

Parameter name: Measurement Of 6A1 Switch

Recommended value: YES

BeUlQos5AMcSwitch

Parameter name: Measurement Of 5A Switch


BeUlQos6DMcSwitch

Parameter name: Measurement Of 6D Switch

Recommended value: NO


Events 6A and 6B

Events 6A1, 6A2, 6B1 and 6B2:


Event 6D

Event 6D:


Parameters of Link Stability (Cont.) MaxUlTxPowerforInt

Parameter name: Max UL TX power of interactive

service

Recommended value: 24, namely 24dBm

MaxUlTxPowerforBac

Parameter name: Max UL TX power of background

service

Recommended value: 24, namely 24dBm


Parameters of Link Stability (Cont.) UlThd6A1/UlThd6B1/UlThd6A2/UlThd6B2

Parameter name:

Uplink Event 6A1/6B1/6A2/6B2 Relative Threshold

Recommended value:

None, none, none, none


Parameters of Link Stability (Cont.) UlBeTrigTime6A1/UlBeTrigTime6B1/

UlBeTrigTime6A2

/UlBeTrigTime6B2/UlBeTrigTime6D

Parameter name:

BE Trigger Time 6A1/6B1/6A2/6B2/6D

Recommended value:

640ms, 2560ms, 1280ms, 1280ms, 240ms


Event 5A

Event 5A:


Parameters of Link Stability (Cont.) StaBlkNum5A

Parameter name: Statistic Block Number For 5A Event

Recommended value: None

Thd5A

Parameter name: Event 5A Threshold


HangBlockNum5A

Parameter name: Interval Block Number



Contents








Downlink Stability Measurement Item DL stability measurement involves two measurement items:

TCP and RLC PDU retransmission rate

The TX power in the pilot field of the DPCCH is measured on the

NodeB side. When the TX power is above the threshold of event

Ea, you can infer that the radio link is unstable

Whether the RLC PDU retransmission rate needs to be measured

can be specified by the parameter SrncBeDlRlcQosSwitch. The

RLC PDU retransmission rate is reported by event A. When the

RLC PDU retransmission rate is above the threshold of event A,

you can infer that the radio link is unstable


Downlink Stability Measurement Event DL TX power in the pilot field of the DPCCH:

Event E (Ea/Eb): is used to check whether the DL power

is excessively high, and trigger a DL rate decrease

Event F (Fa/Fb): is used to check whether the DL power

is excessively low, and trigger a DL rate increase

DL RLC PDU retransmission rate:

Event A: The PDU retransmission rate during the sliding

window is above the predefined threshold


Event E

Event E has two measurement thresholds, that is, E

threshold 1 and E threshold 2:

Event Ea means that the TX power is above E threshold 1

Event Eb means that the TX power is below E threshold 2

For different services, there are different thresholds for

event Ea/Eb. The E threshold of event Ea/Eb is obtained

from the relative threshold and calculated according to

the following formula:

E threshold = Maximum DL power – Relative threshold + PO3


Event E (Cont.)

Event E reporting mechanism:

Power T1: measurement hysteresis time

Measurement threshold 1

Measurement threshold 2

T1

T1

T1

Ea Eb Ea Periodic reporting

Time


Parameters of Link Stability (Cont.) RlMaxDlPwr

Parameter name: RL Max DL TX power

Recommended value: refer to Power Control course

ThdEa/ThdEb

Parameter name: Event Ea/Eb Relative Threshold

Recommended value: None, none

PO3

Parameter name: The power offsets of pilot fields of the

DPCCH reference to the power of DPDCHs

Recommended value: refer to Power Control course (3dB)


Parameters of Link Stability (Cont.) DlBeTrigTimeE

Parameter name: BE Trigger Time Of Event E


ChoiceRptUnitForBeE

Parameter name: BE Reporting Period Unit For Event E

Recommended value: TEN_MSEC

TenMsecForBeE

Parameter name: BE Event E Reporting Period In 10ms



Event F

Event F has two measurement thresholds, that is, F

threshold 1 and F threshold 2:

Event Fa means that the TX power is below F threshold 1

Event Fb means that the TX power is above F threshold 2

The F threshold is related to the current rate and the

target rate of rate increase (triggered by event 4a). The F

threshold is calculated according to the following formula:

F threshold = Pmax – ∆p – Pmargin – Ea relative threshold +

PO3


Event F (Cont.)

Event F reporting mechanism:


Parameters of Link Stability (Cont.) Pmax

Parameter name: the maximum DL TX power

corresponding to the target rate

Recommended value: refer to Power Control course

BePwrMargin/CombPwrMargin

Parameter name: BE/Comb Event F Reporting Power

Margin

Recommended value: 10/20, namely 1dB/2dB


Parameters of Link Stability (Cont.) DlBeTrigTimeF

Parameter name: BE Trigger Time Of Event F


ChoiceRptUnitForBeF

Parameter name: BE Reporting Period Unit For Event F

Recommended value: TEN_MSEC

TenMsecForBeF

Parameter name: BE Event F Reporting Period In 10ms



Event A

Event A reporting mechanism:


Parameters of Link Stability (Cont.) SrncBeDlRlcQosSwitch

Parameter name: Srnc Parameter for BE Downlink RLC

QOS


MoniterPrd

Parameter name: re-TX monitor period



Parameters of Link Stability (Cont.) EventAThred

Parameter name: Event A threshold

Recommended value: 160, namely 16%

TimeToTiggerA Parameter name: Event A time to trigger

Recommended value: 2

PendingTimeA

Parameter name: Event A pending time after trigger



Contents








Rate Decrease in UL

For rate decrease based on uplink stability, only the

3-Rates decrease applies:

If the current rate is MBR, the rate is downsized to the

value of Uplink mid bit rate threshold

If the current rate is higher than Uplink full coverage

bit rate and lower than MBR, the rate is downsized to

the value of Uplink full coverage bit rate


Rate Decrease in UL (Cont.)

Rate decrease based on uplink stability in the case

of 3-Rates adjustment:


Parameters of Link Stability (Cont.) UlFullCvrRate

Parameter name: Uplink Full Coverage Bit Rate



Rate Increase in UL

Rate increase procedure based on uplink stability:


Rate Increase in UL (Cont.)

If the RNC receives a report on event 6B2 but does not

receive any report on event 6A2, the channel power is

sufficient. In this case, rate increase based on traffic

volume can be triggered by event 4a

If the RNC receives a report on event 6A2, no rate

increase based on traffic volume can be triggered by

event 4a

If the RNC receives a report on event 6B1, rate decrease

is stopped and no rate increase can be triggered


Contents








Rate Decrease in DL

For rate decrease based on downlink stability, only

the 3-Rates decrease applies:

If the current rate is MBR, the rate is downsized to the

value of Downlink mid bit rate threshold

If the current rate is higher than Downlink full coverage

bit rate and lower than MBR, the rate is downsized to

the value of Downlink full coverage bit rate


Rate Decrease in DL (Cont.)

Rate decrease based on downlink stability in the

case of 3-Rates adjustment:


Parameters of Link Stability (Cont.) DlFullCvrRate

Parameter name: Downlink Full Coverage Bit Rate



Rate Increase in DL

Rate increase procedure based on downlink stability:


Rate Increase in DL (Cont.)

If event Fa is reported, you can infer that the DL

channel power is sufficient. If event 4a is also

reported, a rate increase can be triggered

If event Fb is reported, you can infer that the DL

channel power is insufficient. In this case, no rate

increase can be triggered


Contents








Signaling Procedure

Signaling procedure of rate decrease based on

downlink stability:


Contents

1. DCCC Overview








Contents


5.1 Rate Adjustment Based on Uplink Congestion

5.2 Rate Adjustment Based on Downlink Congestion

5.3 Rate Increase Failure and Penalty



Rate Adjustment Based on Uplink Congestion When LDR triggers BE service rate decrease, the

selected RAB rate is decreased to the target rate.

The target rates for rate adjustment are different for

DCH RAB and HSUPA RAB:

If the selected RAB is a DCH RAB, the rate adjustment

level can only be 3_Rates:

If the current rate is equal to the MBR, it is decreased to

the UL middle rate threshold

If the current rate is higher than the GBR but lower than

the MBR, it is decreased to the GBR


Rate Adjustment Based on Uplink Congestion (Cont.)

If the selected RAB is an HSUPA RAB, a rate is selected

from the HSUPA UL rate adjustment set as the target

rate for rate decrease:

The target rate must be smaller than but the closest to

the current rate. Meanwhile it must be greater than or

equal to the GBR


Rate Adjustment Based on Uplink Congestion (Cont.)


Contents







Rate Adjustment Based on Downlink Congestion When a cell is in the basic congestion state in the

downlink, the rate of the selected RAB is decrease to

the GBR if a BE rate decrease is triggered. The rate

decrease level can only be 3_Rates:

If the current rate is equal to the MBR, the current rate

is decreased to the DL middle rate threshold

If the current rate is higher than the GBR but lower

than the MBR, the current rate is decreased to the GBR


Rate Adjustment Based on Downlink Congestion (Cont.)


Contents







Rate Increase Failure and Penalty When the cell is in the basic congestion state, the

rates lower than the GBR can be increased. Whether

rate increase can succeed depends on whether the

required resources are sufficient

A rate increase failure may be due to lack of Iub

resources, lack of cell resources, NodeB exception, UE

exception, or other causes. If rate increase failures

occur frequently, rate increase attempts have to be

prevented for a period of time


Rate Increase Failure and Penalty (Cont.) Rate increase failure penalty in the case of 2_Rates

adjustment:


Parameters of Basic Congestion MoniTimeLen

Parameter name: DCCC Rate Up Fail Monitor Time length

Recommended value: 60, namely 60s

FailTimeTh

Parameter name: DCCC Rate Up Fail Time Threshold


DcccUpPenaltyLen

Parameter name: DCCC Rate Up Fail Penalty Time Length



Contents







Signaling Procedure

Signaling procedure of rate decrease based on UL/DL

basic congestion:


Contents

1. DCCC Overview








Contents


6.1 UE State Transition Overview

6.2 UE State Transition From CELL_DCH to CELL_FACH

6.3 UE State Transition From CELL_FACH to CELL_PCH

6.4 UE State Transition From CELL_PCH to URA_PCH

6.5 UE State Transition From CELL/URA_PCH to CELL_FACH

6.6 UE State Transition From CELL_FACH to CELL_DCH


UE State Transition

UE state transitions:


UE State Transition Switches

The switches related to the UE state transition

function are as follows:

DRA_PS_BE_STATE_TRANS_SWITCH

DRA_PS_NON_BE_STATE_TRANS_SWITCH

DRA_HSDPA_STATE_TRANS_SWITCH

DRA_HSUPA_STATE_TRANS_SWITCH


Parameters of UE State Transition

Parameter Parameter NameRecommende

d Value

DRA_PS_BE_STATE_TRANS_SWITCH

Dynamic resource allocation switch for PS BE services

ON

DRA_PS_NON_BE_STATE_TRANS_SWITCH

Dynamic resource allocation switch for PS Non BE services

OFF

DRA_HSDPA_STATE_TRANS_SWITCH

Dynamic resource allocation switch for HSDPA services

OFF

DRA_HSUPA_STATE_TRANS_SWITCH

Dynamic resource allocation switch for HSUPA services

OFF

Recommended values of UE state transition

switches:


Contents









CELL_DCH to CELL_FACH

UE state transition from CELL_DCH to CELL_FACH:


CELL_DCH to CELL_FACH (Cont.) The CELL_DCH to CELL_FACH transition threshold is

the rounded-down value obtained according to the

following formula:

CELL_DCH to CELL_FACH transition threshold =

[CELL_DCH to CELL_FACH transition time/(Time to

trigger + Pending time after trigger) x State transition

traffic redundancy coefficient]


CELL_DCH to CELL_FACH (Cont.)

Service Type


Transition Timer

Threshold of Event 4b

Time to TriggerPending Time After Trigger

BE service on the DCH

BeD2FStateTransTimer

D2F2PTvmThd D2FTvmTimeToTrig D2FTvmPTAT

BE service on the HS-DSCH

BeH2FStateTransTimer

BeH2FTvmThdBeH2FTvmTimeToTrig

BeH2FTvmPTAT

Real-time service in the PS domain

RtDH2FStateTransTimer

RtDH2FTvmThd

RtDH2FTvmTimeToTrig

tDH2FTvmPTAT

BE service on the E-DCH

BeE2FStateTransTimer

E2FThrouThdE2FThrouTimeToTrig x E2FThrouMeasPeriod

E2FThrouPTAT x E2FThrouMeasPeriod

Parameters of event 4b for CELL_DCH to CELL_FACH:


Parameters of UE State Transition (Cont.)

Parameter Parameter nameRecommended

value

BeD2FStateTransTimer

BE DCH to FACH Transition Timer

5s

D2F2PTvmThdBE D2F/R Or F/R2P 4B Threshold

64bytes

D2FTvmTimeToTrig BE D2F/R 4B Time 5000ms

D2FTvmPTATBE D2F/R 4B Pending Time

1000ms

BE service on the DCH:




value

BeH2FStateTransTimer

BE HS-DSCH to FACH Transition Timer

5s

BeH2FTvmThdBE HS-DSCH2F 4B Threshold

64bytes

BeH2FTvmTimeToTrig

BE HS-DSCH2F 4B Time 5000ms

BeH2FTvmPTATBE HS-DSCH2F 4B Pending Time

1000ms

BE service on the HS-DSCH:




value

RtDH2FStateTransTimer

Realtime DCH or HSPA To FACH Transition Timer

180s

RtDH2FTvmThdRT D/HSPA2F 4B Threshold

64bytes

RtDH2FTvmTimeToTrig

RT D/HSPA2F 4B Time 5000ms

tDH2FTvmPTATRT D/HSPA2F 4B Pending Time

16000ms

Real-time service in the PS domain:




value

BeE2FStateTransTimer

BE E-DCH To FACH State Transition Timer

5s

E2FThrouThd E-DCH2F 4B Threshold 8kbit/s

E2FThrouMeasPeriod

E-DCH Throu Meas Period

300ms

E2FThrouTimeToTrig

E-DCH2F 4B Period Amount

2

E2FThrouPTAT E-DCH2F 4B Pending Period Amount

4

BE service on the E-DCH:


Parameters of UE State Transition (Cont.) LittleRateThd

Parameter name: Low Activity Bit Rate Threshold



Contents









CELL_FACH to CELL_PCH

UE state transition from CELL_FACH to CELL_PCH is

applicable to BE services in the PS domain

UE state transition from CELL_FACH to CELL_PCH is

similar to UE state transition from CELL_DCH to

CELL_FACH


CELL_FACH to CELL_PCH (Cont.) The CELL_FACH to CELL_PCH transition threshold is

the rounded-down value obtained according to the

following formula:

CELL_FACH to CELL_PCH transition threshold =

[CELL_FACH to CELL_PCH transition time/(Time to

trigger + Pending time after trigger) x State transition

traffic redundancy coefficient]


CELL_FACH to CELL_PCH (Cont.)

Service Type


Transition Timer

Threshold of Event 4b

Time to TriggerPending Time After Trigger

BE service in the PS domain

BeF2PStateTransTimer

D2F2PTvmThd F2PTvmTimeToTrig F2PTvmPTAT

Parameters of event 4b for CELL_FACH to CELL_PCH:




value

BeF2PStateTransTimer

BE FACH to PCH Transition Timer

65535s

D2F2PTvmThdBE D2F/R Or F/R2P 4B Threshold

64bytes

F2PTvmTimeToTrig BE F2P 4B Time 5000ms

F2PTvmPTATBE F2P 4B Pending Time

16000ms



Contents









CELL_PCH to URA_PCH

Before the state transition, the state of the UE is

CELL_PCH. During the cell reselection, the UE sends the

CELL UPDATE messages. The RNC starts a timer

(CellReSelectTimer) and counts the number of CELL

UPDATE messages with the cause value of cell

reselection. When the timer expires, the number of CELL

UPDATE messages may be above the threshold

(CellReSelectCounter). In this case, the RNC initiates a

state transition when the UE sends the CELL UPDATE

message again


Parameters of UE State Transition (Cont.) CellReSelectTimer

Parameter name: Cell Reselection Timer


CellReSelectCounter

Parameter name: Cell Reselection Counter Threshold



Contents









CELL_PCH/URA_PCH to CELL_FACH

The state of the UE transits from CELL_PCH/URA_PCH

to CELL_FACH when the UTRAN pages the UE or

when the UE needs to exchange information with the

UTRAN


Contents









CELL_FACH to CELL_DCH

The state of the UE transits from CELL_FACH to

CELL_DCH when the UTRAN receives a report that

the UL/DL traffic volume is above the threshold of

event 4a

The following table lists the target rates for UE state

transitions from CELL_FACH to CELL_DCH




BeF2DTvmThd

Parameter name: BE F/R2D 4A Threshold

Recommended value: D1024, namely 1024bytes

BeF2DTvmTimeToTrig

Parameter name: BE F/R2D 4A Time

Recommended value: D0, namely 0ms



BE service on the HS-DSCH:

BeF2HTvmThd

Parameter name: BE F2HS-DSCH 4A Threshold


BeF2HTvmTimeToTrig

Parameter name: BE F2HS-DSCH 4A Time




Real-time service in the PS domain:

RtF2DHTvmThd

Parameter name: RT F2D/HSPA 4A Threshold


RtF2DHTvmTimeToTrig

Parameter name: RT F2D/HSPA 4A Time




BE service on the E-DCH:

BeF2ETvmThd

Parameter name: BE F2E-DCH 4A Threshold


BeF2ETvmTimeToTrig

Parameter name: BE F2E-DCH 4A Time



Contents

1. DCCC Overview








Contents


7.1 Always Online

7.2 Fast Dormancy


Always Online When the RNC detects that there is no data

transmission for a PS service, the RNC sends a request

to the CN for release of the service. The CN initiates

the release procedure, requesting the RNC to release

the corresponding radio resources

The CN, however, reserves the PDP context for this PS

service of the UE. When the UE re-initiates the service

of this PDP context, it need not apply for the PDP

context again. Thus, the UE in the PS domain is always

online


Always Online Procedure


Parameters of Always Online

Timer

Service Type ParameterRecommended

value

T1

ConversationalPsInactTmrForC

on20, namely 20s

StreamingPsInactTmrForS

tr20, namely 20s

InteractivePsInactTmrForI

nt20, namely 20s

BackgroundPsInactTmrForB

ac 20, namely 20s

T2

ConversationalProtectTmrForC

on20, namely 20s

StreamingProtectTmrForS

tr20, namely 20s

InteractiveProtectTmrForI

nt20, namely 20s

BackgroundProtectTmrForB

ac20, namely 20s

Recommended values of T1 and T2:


Fast Dormancy

Fast dormancy which is introduced in in 3GPP Release 8

enables the fast release of RRC connection and enables

the UE to quickly enter into idle mode and save power.

When a UE with only PS services has no data to transmit,

the UE notifies the RNC. After RNC receive the messages

from the UE, RNC release the RRC connection. The

function depends on the support of the UE


Parameters of Fast Dormancy

T323

Parameter name: Timer 323

Recommended value: INVALID

Thank youwww.huawei.com

9 wcdma ran12 dccc algorithm and parameters issue1.00

Documents