05 OWJ200105 WCDMA DCCC Algorithm and Parameters ISSUE1

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Confidential Information of Huawei. No Spreading Without Permission

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www.huawei.com

Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA Dynamic Channel Configuration Control (DCCC)

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Page1Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

� Briefly explain DCCC benefit

� Describe how the DCCC algorithm works

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Contents1. DCCC Overview

2. Rate Reallocation Based on Traffic Volume

3. Rate Reallocation Based on Throughput

4. Rate Reallocation Based on Link Quality

5. UE State Transition Algorithm

6. Always Online

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DCCC Description� DCCC: Dynamic Channel Configuration Control

� DCCC, as one the most important RAN feature, will allocate

dynamic resource according to the service request

� Meanwhile, DCCC is an effective method to increase the radio

resource utilization efficiency.

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6. Always Online

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Contents2. Rate Reallocation Based on Traffic Volume

2.1 Traffic Volume Measurement and Event Reporting

2.2 Rate Reallocation Based on Traffic Volume

2.3 Signaling Procedure

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Traffic Volume Measurement � In the uplink, the UE measures Dedicated Traffic Channel

(DTCH), (that is, buffer occupancy of RLC entities), to

obtain the uplink traffic volume.

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

buffer occupancy of RLC entities), to obtain the downlink

traffic volume.

� Rate reallocation herein is based on the traffic volume measurement. After comparing the measurement results with associated thresholds, the RNC can trigger rate reallocation.

� The traffic volume measurements defined in 3GPP TS 25.331 are applicable only to the uplink. Regarding the downlink traffic volume measurements and associated rate reallocation, the design and implementation are Huawei specific.

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Event� Event 4a

� Traffic volume is above a threshold -> High active

� Event 4b

� Traffic volumes is below a threshold -> Low active

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Event Reporting� Traffic volume measurement triggering can be associated

with both the time-to-trigger and the pending time after trigger

� Time-to-trigger is used to get time domain hysteresis, that is, the condition must be fulfilled during the time-to-trigger period before a report is sent.

� Pending time after trigger is used to limit consecutive reports when one traffic volume measurement report has already been sent.

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Event Reporting� Event 4a triggered by an increase in the transport channel

traffic volume

� In the uplink: � When the traffic volume is higher than the value of Traffic Measurement Event 4A

threshold for a period of time defined by Time to trigger 4A, the UE reports an event 4a. No more events 4a are reported during the time defined by Pending time after trigger 4A.

� In the downlink: � When the traffic volume is higher than the value of Traffic Measurement Event 4A

threshold for a period of time defined by Time to trigger 4A, the RNC reports internally an event 4a. No more events 4a are reported during the time defined by Pending time after trigger 4A.

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Event Reporting� Event 4b triggered by a decrease in the transport channel

traffic volume

� In the uplink: � When the traffic volume is lower than the value of Traffic Measurement Event 4B

threshold for a period of time defined by Time to trigger 4B, the UE reports an event 4b. No more events 4b are reported during the time defined by Pending time after trigger 4B.

� In the downlink: � When the traffic volume is lower than the value of Traffic Measurement Event 4B

threshold for a period of time defined by Time to trigger 4B, the RNC reports internally an event 4b. No more events 4b are reported during the time defined by Pending time after trigger 4B.

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Parameters� All the preceding parameters associated with events 4a and

4b are configurable in each direction, that is, either uplink or

downlink.

� DIRECTION

� Parameter name: Direction

� Recommended value: None

� The Direction parameter has to be set before the setting of the event-related parameters.� If Direction is set to UPLINK, all the event-related parameters take effect in the uplink.� If Direction is set to DOWNLINK, all the event-related parameters take effect in the

downlink. � DIRECTION

� Parameter name: Direction � Value range: DOWNLINK, UPLINK � Physical value range: DOWNLINK, UPLINK � Unit: None � Content: This parameter defines the Traffic Volume Measurement (TVM) direction.

� DOWNLINK: Conduct downlink TVM.� UPLINK: Conduct uplink TVM.

� Recommended value: None. � Set this parameter through ADD TYPRABDCCCMC

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Parameters� EVENT4ATHD

� Parameter name: Traffic Measurement Event 4A threshold

� Recommended value: D1024, namely 1024Byte

� EVENT4BTHD

� Parameter name: Traffic Measurement Event 4B threshold

� Recommended value: D128(rate < 128k),D256(rate >= 128k)

� EVENT4ATHD� Parameter name: Traffic Measurement Event 4A threshold � Value range: D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k, D8k,

D12k, D16k, D24k, D32k, D48k, D64k, D96k, D128k, D192k, D256k, D384k, D512k, D768k

� Physical value range: 16, 32, 64, 128, 256, 512, 1024, 2k, 3k, 4k, 6k, 8k, 12k, 16k, 24k, 32k, 48k, 64k, 96k, 128k, 192k, 256k, 384k, 512k, 768k .

� Unit: byte � Content: This parameter defines the threshold to trigger event 4a, that is, the upper

threshold of traffic volume. � Recommended value: D1024 . � Set this parameter through ADD TYPRABDCCCMC

� EVENT4BTHD� Parameter name: Traffic Measurement Event 4B threshold � Value range: D8, D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k, D8k,

D12k, D16k, D24k, D32k, D48k, D64k, D96k, D128k, D192k, D256k, D384k, D512k � Physical value range: 8, 16, 32, 64, 128, 256, 512, 1024, 2k, 3k, 4k, 6k, 8k, 12k, 16k,

24k, 32k, 48k, 64k, 96k, 128k, 192k, 256k, 384k, 512k .� Unit: byte � Content: This parameter defines the threshold to trigger event 4b, that is, the lower

threshold of traffic volume. � Recommended value: D128(rate < 128k),D256(rate >= 128k) . � Set this parameter through ADD TYPRABDCCCMC

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Parameters� TIMETOTRIGGER4A

� Parameter name: Time to trigger 4A

� Recommended value: D240, namely 240ms

� TIMETOTRIGGER4B

� Parameter name: Time to trigger 4B


� TIMETOTRIGGER4A� Parameter name: Time to trigger 4A � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240, D320,

D640, D1280, D2560, D5000 � Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280,

2560, 5000 .� Unit: ms� Content: The time-to-trigger for event 4a is used to prevent frequent triggering caused

by small fluctuations of the traffic. � Recommended value: D240. � Set this parameter through ADD TYPRABDCCCMC

� TIMETOTRIGGER4B� Parameter name: Time to trigger 4B � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240, D320,

D640, D1280, D2560, D5000 � Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280,

2560, 5000 .� Unit: ms� Content: The time-to-trigger for event 4b is used to prevent frequent triggering caused

by small fluctuations of the traffic. � Recommended value: D2560 . � Set this parameter through ADD TYPRABDCCCMC

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Parameters� PENDINGTIME4A

� Parameter name: Pending time after trigger 4A


� PENDINGTIME4B

� Parameter name: Pending time after trigger 4B


� PENDINGTIME4A� Parameter name: Pending time after trigger 4A � Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 � Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 .� Unit: ms� Content: The pending time period after trigger for event 4a is associated with a timer

started after the event measurement report is triggered. � Recommended value: D4000 . � Set this parameter through ADD TYPRABDCCCMC

� PENDINGTIME4B� Parameter name: Pending time after trigger 4B � Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 � Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 .� Unit: ms� Content: The pending time period after trigger for event 4b is associated with a timer

started after the event measurement report is triggered. � Recommended value: D4000 . � Set this parameter through ADD TYPRABDCCCMC

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Rate Reallocation Strategy

� In Huawei implementation, two strategies are available for

rate reallocation 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

� The RATE_UP_AND_DOWN_ON_DCH strategy means that the rate can be either downsized or upsized. When the system resources in the network are insufficient, the RATE_UP_AND_DOWN_ON_DCH strategy is recommended.

� The RATE_UP_ONLY_ON_DCH strategy means that the rate can only be upsized. When the network resources are sufficient, the RATE_UP_ONLY_ON_DCH strategy is recommended.

� DCCCSTG� Parameter name: DCCC strategy � Value range: RATE_UP_AND_DOWN_ON_DCH, RATE_UP_ONLY_ON_DCH � Physical value range: 0, 1 .� Content: This parameter defines the strategy of adjusting the data rate of PS BE

services when the UE is in CELL_DCH state.� RATE_UP_AND_DOWN_ON_DCH: Data rate upsizing and rate downsizing

are allowed.� RATE_UP_ONLY_ON_DCH: Only data rate upsizing is allowed. It means that

the state of UE transits from CELL_DCH to CELL_FACH when the 4b event is reported.

� Recommended value: RATE_UP_AND_DOWN_ON_DCH . � Set this parameter through SET DCCC.

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UL Rate Reallocation Based on Traffic Volume

� Principles of RATE_UP_AND_DOWN_ON_DCH

� Rate downsizing is performed if the RNC receives a report of

event 4b about the uplink traffic volume.

� Rate upsizing is performed if the RNC receives a report of

event 4a about the uplink traffic volume.

� The lowest value that the rate can be downsized to is the value of Uplink bit rate threshold for DCCC. The highest value that the rate can be upsized to is MBR, which is Min{ the requested maximum bit rate assigned by the CN, the maximum rate supported by UE capabilities}.

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UL Rate Reallocation Based on Traffic Volume

� Principles of RATE_UP_ONLY_ON_DCH

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

state of the UE is directly transitted to CELL_FACH if the UE

state transition algorithm is enabled.



� The lowest value that the rate can be downsized to is the value of Uplink bit rate threshold for DCCC. The highest value that the rate can be upsized to is MBR, which is MIN{therequested maximum bit rate assigned by the CN, the maximum rate supported by UE capabilities}.

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UL Rate Increase� When Uplink Rate increase adjust level is 2_Rates, the

rate is upsized directly to the MBR from the Uplink bit rate threshold for DCCC.

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UL Rate Increase� When Uplink Rate increase adjust level is 3_Rates, In the

process of upsizing : � If the current rate is lower than the value of Uplink bit rate threshold

for DCCC, the data rate is upsized to the value of Uplink bit rate threshold for DCCC.

� If the current rate equals the value of Uplink bit rate threshold for DCCC, the data rate is upsized to the value of Uplink mid bit rate threshold and then to the MBR.

� If the current rate is lower than MBR and higher than the value of Uplink bit rate threshold for DCCC, the rate is upsized to MBR when upsizing is triggered.

� If the value of Uplink mid bit rate threshold is lower than that of Uplink bit rate threshold for DCCC, the rate is directly upsized to the MBR, which is the same as the processing applicable when Uplink Rate increase adjust level is 2_Rates.

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UL Rate Decrease� When Uplink Rate decrease adjust level is 2_Rates, the

data rate is downsized directly to the value of Uplink bit rate threshold for DCCC

� When Uplink Rate decrease adjust level is 2_Rates, the data rate is downsized directly to the value of Uplink bit rate threshold for DCCC

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UL Rate Decrease� When Uplink Rate decrease adjust level is 3_Rates, the

data rate is downsized to the value of Uplink mid bit rate threshold if the current rate is the MBR, and then to the

value of Uplink bit rate threshold for DCCC. If the current

rate is lower than MBR and higher than Uplink bit rate threshold for DCCC, the rate is downsized to Uplink bit rate threshold for DCCC when downsizing is triggered.

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UL Parameters� ULRATEUPADJLEVEL

� Parameter name: Uplink Rate increase adjust level

� Recommended value: 3_Rates

� ULRATEDNADJLEVEL

� Parameter name: Uplink Rate decrease adjust level


� ULRATEUPADJLEVEL� Parameter name: Uplink Rate increase adjust level � Value range: 2_Rates, 3_Rates � Physical value range: 1, 2 .� Content: This parameter defines whether to use 2-rate or 3-rate increase adjustment in

the uplink. � Recommended value: 3_Rates . � Set this parameter through SET DCCC

� ULRATEDNADJLEVEL� Parameter name: Uplink Rate decrease adjust level � Value range: 2_Rates, 3_Rates � Physical value range: 1, 2 .� Content: This parameter defines whether to use 2-rate or 3-rate decrease adjustment

in the uplink. . � Recommended value: 3_Rates . � Set this parameter through SET DCCC

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UL Parameters� ULDCCCRATETHD

� Parameter name: Uplink bit rate threshold for DCCC

� Recommended value: D64, namely 64kbps

� ULMIDRATECALC

� Parameter name: Uplink mid bite rate calculate method

� Recommended value: HAND_APPOINT

� ULDCCCRATETHD� Parameter name: Uplink bit rate threshold for DCCC � Value range: D8, D16, D32, D64, D128, D144, D256, D384 � Physical value range: 8, 16, 32, 64, 128, 144, 256, 384 .� Unit: kbit/s. � Content: The larger the parameter value is, the less the algorithm of rate reallocation

based on the traffic volume gains. If the parameter value is too low, however, it may affect the adverse data transfer.

� Recommended value: D64. � Set this parameter through SET DCCC

� ULMIDRATECALC� Parameter name: Uplink mid bite rate calculate method � Value range: AUTO_CALC, HAND_APPOINT � Physical value range: None .� Content: This parameter is used to decide the uplink middle bite rate calculation

method that applies when Uplink Rate increase adjust level or Uplink Rate decrease adjust level is 3_Rates. If Uplink mid bite rate calculate method is set to AUTO_CALC, the value of Uplink mid bit rate threshold is automatically calculated by the system. The value of Uplink mid bit rate threshold is equal to the RB rate closest to the highest rate divided by two. .

� Recommended value: HAND_APPOINT. � Set this parameter through SET DCCC

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UL Parameters� ULMIDRATETHD

� Parameter name: Uplink mid bit rate threshold


� ULMIDRATECALC� Parameter name: Uplink mid bit rate threshold � Value range: D16, D32, D64, D128, D144, D256, D384 � Physical value range: 16, 32, 64, 128, 144, 256, 384 .� Unit: kbit/s� Content: This parameter defines the uplink middle rate threshold used when Uplink

Rate increase adjust level or Uplink Rate decrease adjust level is 3_Rates and Uplink mid bite rate calculate method is HAND_APPOINT.

� Recommended value: None . � Set this parameter through SET DCCC

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DL Rate Reallocation Based on Traffic Volume

� Principles of RATE_UP_AND_DOWN_ON_DCH

� Rate downsizing is performed if the RNC receives a report of

event 4b about the downlink traffic volume.

� Rate upsizing is performed if an event 4a about the downlink

traffic volume is triggered.

� The lowest value that the rate can be downsized to is the value of Downlink bit rate threshold for DCCC. The highest value that the rate can be upsized to is MBR.

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DL Rate Reallocation Based on Traffic Volume

� Principles of RATE_UP_ONLY_ON_DCH

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

state of the UE is directly transitted to CELL_FACH if the UE

state transition algorithm is enabled.



� The highest value that the rate can be upsized to is MBR.

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DL Rate Increase� When Downlink Rate increase adjust level is 2_Rates,

the rate is upsized directly to the highest value from the

value of Downlink bit rate threshold for DCCC.

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DL Rate Increase� When Downlink Rate increase adjust level is 3_Rates,

the rate is upsized to the Downlink mid bit rate thresholdif the current rate is the Downlink bit rate threshold for DCCC, and then to the highest.

� If the value of Uplink mid bit rate threshold is lower than that of Uplink bit rate threshold for DCCC, the rate is directly upsized to the MBR, which is the same as the processing applicable when Uplink Rate increase adjust level is 2_Rates.

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DL Rate Decrease� When Downlink Rate decrease adjust level is 2_Rates,

the rate is downsized directly to the value of Downlink bit rate threshold for DCCC from the MBR

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DL Rate Decrease� When Downlink Rate decrease adjust level is 3_Rates,

the rate is downsized to the value of Downlink mid bit rate threshold if the current rate is the MBR, and then to the

value of Downlink bit rate threshold for DCCC. If the

current rate is lower than MBR and higher than Uplink bit rate threshold for DCCC, the rate is downsized to Uplink bit rate threshold for DCCC when downsizing is triggered.

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DL Parameters� DLRATEUPADJLEVEL

� Parameter name: Downlink Rate increase adjust level


� DLRATEDNADJLEVEL

� Parameter name: Downlink Rate decrease adjust level


� DLRATEUPADJLEVEL� Parameter name: Downlink Rate increase adjust level � Value range: 2_Rates, 3_Rates � Physical value range: 1, 2 .� Content: This parameter defines whether to use 2-rate or 3-rate adjustment in the

downlink when increasing the rate. � Recommended value: 3_Rates . � Set this parameter through SET DCCC

� DLRATEDNADJLEVEL� Parameter name: Downlink Rate decrease adjust level � Value range: 2_Rates, 3_Rates � Physical value range: 1, 2 .� Content: This parameter defines whether to use 2-rate or 3-rate adjustment in the

downlink when decreasing the rate.. � Recommended value: 3_Rates . � Set this parameter through SET DCCC

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DL Parameters� DLDCCCRATETHD

� Parameter name: Donwlink bit rate threshold for DCCC

� Recommended value: D64, namely 64kbps

� DLMIDRATECALC

� Parameter name: Downlink mid bite rate calculate method

� Recommended value: AUTO_CALC

� DLDCCCRATETHD� Parameter name: Downlink bit rate threshold for DCCC � Value range: D8, D16, D32, D64, D128, D144, D256, D384 � Physical value range: 8, 16, 32, 64, 128, 144, 256, 384 .� Unit: kbit/s. � Content: The higher the parameter value is, the less the traffic volume based rate

reallocation algorithm gains. If the parameter value is too low, however, it may affect the adverse data transfer.

� Recommended value: D64. � Set this parameter through SET DCCC

� DLMIDRATECALC� Parameter name: Downlink mid bite rate calculate method � Value range: AUTO_CALC, HAND_APPOINT � Physical value range: None .� Content: This parameter is used to decide the downlink middle bite rate calculation

method that applies when Downlink Rate increase adjust level or Downlink Rate decrease adjust level is 3_Rates. If Downlink mid bite rate calculate method is set to AUTO_CALC, the value of Downlink mid bit rate threshold is automatically calculated by the system. The value of Downlink mid bit rate threshold is equal to the RB rate closest to the highest rate divided by two.

� Recommended value: AUTO_CALC. � Set this parameter through SET DCCC

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DL Parameters� DLMIDRATETHD

� Parameter name: Dwnlink mid bit rate threshold


� ULMIDRATECALC� Parameter name: Uplink mid bit rate threshold � Value range: D16, D32, D64, D128, D144, D256, D384 � Physical value range: 16, 32, 64, 128, 144, 256, 384 .� Unit: kbit/s� Content: This parameter defines the downlink middle rate threshold used when

Downlink Rate increase adjust level or Downlink Rate decrease adjust level is 3_Rates and Downlink mid bit rate calculate method is HAND_APPOINT.

� Recommended value: None . � Set this parameter through SET DCCC

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Signaling Procedure of UL Rate Reallocation

� Signaling procedure of UL rate downsizing based on traffic

volume

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Signaling Procedure of UL Rate Reallocation

� Signaling procedure of UL rate upsizing based on traffic

volume

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Signaling Procedure of DL Rate Reallocation

� Signaling procedure of DL rate downsizing based on traffic

volume

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Signaling Procedure of DL Rate Reallocation

� Signaling procedure of DL rate upsizing based on traffic

volume

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6. Always Online

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Contents3. Rate Reallocation Based on Throughput

3.1 Throughput Measurement and Event Reporting

3.2 Rate Reallocation Action Based on Throughput


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Throughput Measurement � In each measurement period (E-DCH Throu Meas Period

for E-DCH service, DCH Throu Meas Period for DCH

service), the MAC-d takes statistics of the data volume

properly received by this RB. The result is then divided by

the measurement period to obtain the throughput value.

� E-DCH and DCH BE services rate reallocation is based on the throughput measurement results. After comparing the measurement results with associated thresholds, the RNC can trigger rate reallocation.

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Event� Event 4a

� Throughput is above a threshold -> High active

� Event 4b

� Throughput is below a threshold -> Low active

� For throughput-based rate reallocation on the E-DCH, both events 4a and 4b apply, that is, both rate upsizing and downsizing are applicable for both uplink and downlink.

� For throughput-based rate reallocation on the DCH, only event 4b applies, that is, only rate downsizing is applicable.

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Event Reporting� Mechanism of throughput measurement and reporting of

events 4a and 4b

� During each measurement period (E-DCH Throu Meas Period, DCH Throu Meas Period), throughput measurement on this RB is performed to obtain the throughput of this period, defined as AvgThroughput.

� If the AvgThroughput is higher than the 4a threshold for Ttrig_4a consecutive times (Period Amount to trigger 4A on EDCH) and the Tpend_4a timer whose length is defined through Period Amount after trigger 4A on EDCH is not started, event 4a is reported and the Tpend_4a timer is started.

� If the AvgThroughput is lower than the 4b threshold for Ttrig_4b consecutive times (Period Amount to trigger 4B on EDCH or Period Amount to trigger 4B on DCH)and the Tpend_4b timer whose length is defined through Period Amount after trigger 4B on EDCH or Period Amount after trigger 4B on DCH is not started, event 4b is reported and the Tpend_4b timer is started.

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Event Threshold� In the aspect of DCCC for HSUPA

� The 4a threshold is the throughput threshold associated with

the current HSUPA adjustment rate, that is, TRt.

� TRt = Rt * threshold rate ratiot

� The 4b threshold is the throughput threshold associated with

the previous rate, that is, TRt–1.

� TRt–1 = Rt–1 * threshold rate ratiot–1

� If the current HSUPA adjustment rate is the minimum rate, the 4b rate threshold is the threshold rate of E-DCH to FACH state transition (E-DCH to FACH 4b Threshold).

� Where:� Rt is the current rate in the rate adjustment set � Rt-1 is the previous rate in the rate adjustment set.� Threshold rate ratiot and Threshold rate ratiot-1 are defined by the parameter percent

of ratio for nKbps (n = 8, 16, 32, 64, 128, 144, 256, 384).

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Event Threshold� In the aspect of DCCC for DCH services,

� The 4b threshold is calculated as follows:

� TRt–1 = Rt–1 * threshold rate ratiot–1

� Where:� Rt-1 is the previous rate in the rate adjustment set.� Threshold rate ratiot-1 is defined by the parameter percent of ratio for nKbps (n = 8,

16, 32, 64, 128, 144, 256, 384).

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Parameters� E2FTHROUMEASPERIOD

� Parameter name: E-DCH Throu Meas Period

� Recommended value: 30, namely 300s

� EDCHTIMETOTRIGGER4A

� Parameter name: Period Amount to trigger 4A on EDCH

� Recommended value: 2

� E2FTHROUMEASPERIOD� Parameter name: E-DCH Throu Meas Period� Value range: 1 to 10000 � Physical value range: 10 ms to 100s.� Unit: ms� Content: This parameter defines how often the E-DCH throughput is measured. � Recommended value: 30. � Set this parameter through SET UESTATETRANS

� EDCHTIMETOTRIGGER4A� Parameter name: Period Amount to trigger 4A on EDCH� Value range: 0 to 1023 � Physical value range: 0 to 1023 .� Content: This parameter defines during how many consecutive time periods the

throughput exceeds the 4a threshold. After the throughput exceeds the threshold for the time defined by this parameter, event 4a is reported.

� Recommended value: 2. � Set this parameter through ADD TYPRABDCCCMC

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Parameters� EDCHPENDINGTIME4A

� Parameter name: Period Amount after trigger 4A on EDCH


� EDCHTIMETOTRIGGER4B

� Parameter name: Period Amount to trigger 4B on EDCH


� EDCHPENDINGTIME4A� Parameter name: Period Amount after trigger 4A on EDCH� Value range: 0 to 1023 � Physical value range: 0 to 1023 � Content: This parameter defines the number of consecutive measurement periods for

not reporting event 4a after reporting of an event 4a. � Recommended value: 16. � Set this parameter through ADD TYPRABDCCCMC

� EDCHTIMETOTRIGGER4B� Parameter name: Period Amount to trigger 4B on EDCH� Value range: 0 to 1023 � Physical value range: 0 to 1023 .� Content: This parameter defines during how many consecutive time periods the

throughput exceeds the 4b threshold. After the throughput exceeds the threshold for the time defined by this parameter, event 4b is reported.


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Parameters� EDCHPENDINGTIME4B

� Parameter name: Period Amount after trigger 4B on EDCH


� EDCHRATEADJUSTSET

� Parameter name: HSUPA Uplink rate adjust set


� EDCHPENDINGTIME4B� Parameter name: Period Amount after trigger 4B on EDCH� Value range: 0 to 1023 � Physical value range: 0 to 1023 � Content: This parameter defines the number of consecutive measurement periods for

not reporting event 4b after reporting of an event 4b. � Recommended value: 16. � Set this parameter through ADD TYPRABDCCCMC

� EDCHRATEADJUSTSET� Parameter name: HSUPA UpLink rate adjust set� Value range: Rate_8Kbps, Rate_16Kbps, Rate_32Kbps, Rate_64Kbps, Rate_128Kbps,

Rate_144Kbps, Rate_256Kbps, Rate_384Kbps, Rate_608Kbps, Rate_1450Kbps, Rate_2048Kbps, Rate_2890Kbps, Rate_5760Kbps

� Physical value range: 8 kbit/s, 16 kbit/s, 32 kbit/s, 64 kbit/s, 128 kbit/s, 144 kbit/s, 256 kbit/s, 384 kbit/s, 608 kbit/s, 1450 kbit/s, 2048 kbit/s, 2890 kbit/s, 5760 kbit/s .

� Content: This parameter defines the rates contained in the HSUPA adjustment rate set. � Recommended value: None. � Set this parameter through SET EDCHRATEADJUSTSET

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Parameters� RATIOFORRATE8, RATIOFORRATE16,

RATIOFORRATE32, RATIOFORRATE64, RATIOFORRATE128, RATIOFORRATE144, RATIOFORRATE256, RATIOFORRATE384, RATIOFORRATE608, RATIOFORRATE1450, RATIOFORRATE2048, RATIOFORRATE2890, RATIOFORRATE5760

� Parameter name: percent of ratio for nKbps

� Recommended value: 90/90/90/90/80/80/80/75/75/75/75/70/70

� RATIOFORRATE8, RATIOFORRATE16, RATIOFORRATE32, RATIOFORRATE64, RATIOFORRATE128, RATIOFORRATE144, RATIOFORRATE256, RATIOFORRATE384, RATIOFORRATE608, RATIOFORRATE1450, RATIOFORRATE2048, RATIOFORRATE2890, RATIOFORRATE5760

� Parameter name: percent of ratio for 8Kbps, percent of ratio for 16Kbps, percent of ratio for 32Kbps, percent of ratio for 64Kbps, percent of ratio for 128Kbps, percent of ratio for 144Kbps, percent of ratio for 256Kbps, percent of ratio for 384Kbps, percent of ratio for 608Kbps, percent of ratio for 1450Kbps, percent of ratio for 2048Kbps, percent of ratio for 2890Kbps, percent of ratio for 5760Kbps

� Value range: 0 to 100 � Physical value range: 0 to 1� Step: 1% � Content: These parameters define the threshold bit rate ratios of all the bit rates

supported on the RAN side. � Recommended value: 90/90/90/90/80/80/80/75/75/75/75/70/70 . � Set this parameter through SET EDCHTHDRATERATIO

Course Name


N-51


Parameters� DCHTHROUMEASPERIOD

� Parameter name: DCH Throu Meas Period

� Recommended value: 100, namely 1000ms

� DCHTHROUTIMETOTRIGGER4B

� Parameter name: Period Amount to trigger 4B on DCH


� DCHTHROUMEASPERIOD� Parameter name: DCH Throu Meas Period� Value range: 0 to 10000 � Physical value range: 0 to 100s � Unit: 10ms� Content: This parameter defines how often the DCH throughout is measured.� Recommended value: 100. � Set this parameter through SET DCCC

� DCHTHROUTIMETOTRIGGER4B� Parameter name: Period Amount to trigger 4B on DCH � Value range: 0 to 1023 � Physical value range: 0 to 1023 .� Content: This parameter defines during how many consecutive time periods the

throughput exceeds the 4b threshold. After the throughput exceeds the threshold for the time defined by this parameter, event 4b is reported. .


Course Name


N-52


Parameters� DCHTHROUPENDINGTIME4B

� Parameter name: Period Amount after trigger 4B on DCH


� RATIOFORRATE8, RATIOFORRATE16, RATIOFORRATE32, RATIOFORRATE64, RATIOFORRATE128, RATIOFORRATE144, RATIOFORRATE256, RATIOFORRATE384

� Parameter name: percent of ratio for nKbps


� DCHTHROUPENDINGTIME4B� Parameter name: Period Amount after trigger 4B on DCH� Value range: 0 to 1023 � Physical value range: 0 to 1023 � Content: This parameter defines the number of consecutive measurement periods for

not reporting event 4b after reporting of an event 4b. � Recommended value: 16. � Set this parameter through ADD TYPRABDCCCMC

� RATIOFORRATE8, RATIOFORRATE16, RATIOFORRATE32, RATIOFORRATE64, RATIOFORRATE128, RATIOFORRATE144, RATIOFORRATE256, RATIOFORRATE384

� Parameter name: percent of ratio for 8Kbps, percent of ratio for 16Kbps, percentof ratio for 32Kbps, percent of ratio for 64Kbps, percent of ratio for 128Kbps, percent of ratio for 144Kbps, percent of ratio for 256Kbps, percent of ratio for 384Kbps

� Value range: 0 to 100 � Physical value range: 0 to 1 .� Step: 1% � Content: These parameters define the threshold bit rate ratios of all the bit rates

supported on the RAN side. � Recommended value: 90. � Set this parameter through SET DCHTHDRATERATIO

Course Name


N-53






Course Name


N-54


Rate Reallocation Strategy� Two strategies are available for EDCH in Huawei

implementation.

� RATE_UP_AND_DOWN

� RATE_UP_ONLY

� For DCH, only rate downsizing is applicable.

Course Name


N-55


Rate Reallocation on EDCH� The strategy is set through the HSUPA DCCC strategy

parameter.

� HSUPADCCCSTG

� Parameter name: HSUPA DCCC strategy

� Recommended value: RATE_UP_AND_DOWN_ON_EDCH

� The information about setting these parameters is as follows:� The RATE_UP_AND_DOWN_ON_EDCH strategy means that the rate can be both downsized

and upsized. If the system resources in the network are insufficient, the RATE_UP_AND_DOWN_ON_EDCH strategy is recommended.

� The RATE_UP_ONLY_ON_EDCH strategy means that the rate can only be upsized. When the network resources are sufficient, the RATE_UP_ONLY_ON_EDCH strategy is recommended.

� HSUPADCCCSTG� Parameter name: HSUPA DCCC strategy� Value range: RATE_UP_AND_DOWN_ON_EDCH, RATE_UP_ONLY_ON_EDCH � Physical value range: 0, 1 � Unit: 10ms� Content: This parameter defines whether to use the

RATE_UP_AND_DOWN_ON_EDCH or RATE_UP_ONLY_ON_EDCH strategy. � Recommended value: RATE_UP_AND_DOWN_ON_EDCH . � Set this parameter through SET DCCC

Course Name


N-56


Rate Reallocation on EDCH� Principles of RATE_UP_AND_DOWN_ON_EDCH

� After event 4a is reported, the bit rate is adjusted by one level

upwards. If the current rate is the maximum bit rate, no action is

required.

� After event 4b is reported, the reported throughput is compared with

the threshold rate that is associated with the HSUPA adjustment rate.

The RB is reconfigured to the HSUPA adjustment bit rate, which is

associated with the minimum threshold rate of throughput that is

higher than the reported throughput.

Course Name


N-57


Rate Reallocation on EDCH� Principles of RATE_UP_ONLY_ON_EDCH

� After event 4a is reported, the rate is adjusted by one level

upwards. If the current rate is the maximum rate, no action is

required.

� After event 4b is reported, no rate downsizing is done.

However state transition can be done according to rules

specified in 5. UE State Transition Algorithm.

Course Name


N-58


Rate Downsizing on DCH � After event 4b is reported, the reported throughput is

compared with the threshold rate that is associated with the

rate adjustment set. The RB is reconfigured to the rate in

the rate adjustment set, which is associated with the

minimum threshold rate of throughput that is greater than

the reported throughput.

� The above procedure is for both uplink and downlink.

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N-59






Course Name


N-60


Signaling Procedure of Rate Reallocation

� Signaling procedure of rate upsizing based on throughput

Course Name


N-61


Signaling Procedure of Rate Reallocation

� Signaling procedure of rate downsizing based on throughput

� The DCH rate reallocation based on throughput is implemented through the signaling over the Uu and Iub interfaces. Only downsizing is applicable to the DCH rate reallocation based on throughput.

Course Name


N-62







6. Always Online

Course Name


N-63


Contents4. Rate Reallocation Based on Link Quality

4.1 Uplink Quality Measurement and Event Reporting

4.2 Downlink Quality Measurement and Event Reporting

4.3 Rate Reallocation Action Based on Uplink Quality

4.4 Rate Reallocation Action Based on Downlink Quality


� Uplink Quality Measurement and Event Reporting describes the uplink quality evaluation factors and corresponding events.

Course Name


N-64


Uplink Quality Measurement � There are two measurement quantities related to the uplink

quality:

� Uplink transmit power

� Uplink BLER

� The measurement of uplink transmit power through UU interface from UE. When the uplink transmit power reaches the maximum power, it indicates that the radio link may be unstable.

� The measurement of uplink BLER can be implemented in RNC. When uplink BLER is high, it also indicates that the radio link may be unstable.

Course Name


N-65


Event 6A and 6B� In the uplink, the measurement of UE transmit power can

trigger event 6A or event 6B.

� 6A (6A1/6A2): The UE TX power is larger than the UE Tx

power threshold for a period of time

� 6B (6B1/6B2): The UE TX power is lower than the UE Tx

power threshold for a period of time

Course Name


N-66


Parameters� ULTHD6A1

� Parameter name : UL 6A1 event relative threshold

� Recommended value : 2dB

� ULBETRIGTIME6A1

� Parameter name : BE Trigger Time 6A1

� Recommended value : D640

� ULTHD6A1� Parameter name : UL 6A1 event relative threshold � Value range: 0~82 .� Physical value range: 0 to 82; Step: 1 (dB).� Content: This parameter defines the measurement reporting threshold at which

the event 6A1 is triggered. � Recommended value : 2� Set this parameter through ADD TYPRABQUALITYMEAS

� ULBETRIGTIME6A1� Parameter name : BE trigger time 6A1 � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,

D320, D640, D1280, D2560, D5000 .� Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640,

1280, 2560, 5000; Unit: ms . � Content: This parameter defines the duration during which the UE transmitted

power always meets the 6A1 measurement condition before the event 6A1 is triggered. The trigger time is used to avoid any sudden change of the measured value in measurement reporting.

� Recommended value : D640 � Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

Course Name


N-67


Parameters� ULTHD6B1

� Parameter name : UL 6B1 event relative threshold


� ULBETRIGTIME6B1

� Parameter name : BE Trigger Time 6B1


� ULTHD6B1� Parameter name : UL 6B1 event relative threshold � Value range: 0~82 .� Physical value range: 0 to 82; Step: 1 (dB).� Content: This parameter defines the measurement reporting threshold at which

the event 6B1 is triggered. � Recommended value : 2� Set this parameter through ADD TYPRABQUALITYMEAS

� ULBETRIGTIME6B1� Parameter name : BE trigger time 6B1 � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



power always meets the 6B1 measurement condition before the event 6B1 is triggered. The trigger time is used to avoid any sudden change of the measured value in measurement reporting.


Course Name


N-68


Parameters� ULTHD6A2

� Parameter name : UL 6A2 event relative threshold


� ULBETRIGTIME6A2

� Parameter name : BE Trigger Time 6A2


� ULTHD6A2� Parameter name : UL 6A2 event relative threshold � Value range: 1~83 .� Physical value range: 1 to 83; Step: 1 (dB).� Content: This parameter defines the measurement reporting threshold at which

the event 6A2 is triggered. � Recommended value : 10� Set this parameter through ADD TYPRABQUALITYMEAS

� ULBETRIGTIME6A2� Parameter name : BE trigger time 6A2 � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



power always meets the 6A2 measurement condition before the event 6A2 is triggered. The trigger time is used to avoid any sudden change of the measured value in measurement reporting.


Course Name


N-69


Parameters� ULTHD6B2

� Parameter name : UL 6B2 event relative threshold


� ULBETRIGTIME6B2

� Parameter name : BE Trigger Time 6B2


� ULTHD6B2� Parameter name : UL 6B2 event relative threshold � Value range: 0~82 .� Physical value range: 0 to 82; Step: 1 (dB).� Content: This parameter defines the measurement reporting threshold at which

the event 6B2 is triggered. � Recommended value : 10� Set this parameter through ADD TYPRABQUALITYMEAS

� ULBETRIGTIME6B2� Parameter name : BE trigger time 6B2 � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



power always meets the 6B2 measurement condition before the event 6B2 is triggered. The trigger time is used to avoid any sudden change of the measured value in measurement reporting.


Course Name


N-70


Event 6D� If the transmit power of the UE is equal to the maximum

transmit power of the UE for a period of time (the time is

defined by the hysteresis), the UE reports event 6D.

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

power for a period of time

� For BE services, the hysteresis is defined by the Be trigger time 6D parameter.

Course Name


N-71


Parameters� ULBETRIGTIME6D

� Parameter name : BE Trigger Time 6D

� Recommended value : D240, namely 240ms

� ULBETRIGTIME6D� Parameter name : BE trigger time 6D � Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,


1280, 2560, 5000; Unit: ms . � Content: This parameter defines the duration during which the measured UE

transmitted power always meets the 6D measurement condition before the event 6D is triggered. The trigger time is used to avoid any sudden change of the measured value in measurement reporting.


Course Name


N-72


Event 5A� The uplink BLER reflects the uplink quality. The change in

the BLER is indicated by event 5A.

� 5A: The number of error blocks during the sliding window is

greater than or equal to a predefined number

� For a specific service parameter index, set the following parameters related to event 5A:� Statistic Block Number for 5A Event: the length of the sliding window in which the

number of error blocks is counted� Event 5A Threshold: the number of error blocks in a sliding window, which

determines whether to trigger an event 5A or not� Interval Block Number: After an event 5A is triggered, no more event 5A is triggered

before a number of blocks (the number is defined by this parameter) are received.

Course Name


N-73


Event 5A � Event 5A Mechanism

� Each time a block is received, the number of error blocks within the sliding window is compared with the Event 5A Threshold parameter. If the number of error blocks is equal to or greater than the value of the parameter, an event 5A is triggered. When event 5A is triggered, a pending counter is started to prevent further triggering of the event before a certain number of transport blocks which is specified by Interval Block Number are received.

� The whole process is based on the sliding window mechanism. This window slides with the arrival of each block. Each time a block is received, the decision on whether to trigger event 5A is made. The number of error blocks is still counted when the pending timer after trigger timer works. However, no event 5A is triggered even if the triggering conditions are met.

Course Name


N-74


Parameters� STABLKNUM5A

� Parameter name : Statistic Block Number for 5A Event

� Recommended value : 500

� THD5A

� Parameter name : Event 5A Threshold


� STABLKNUM5A� Parameter name : Statistic Block Number for 5A Event� Value range: 1 to 512 .� Physical value range: 1 to 512.� Content: This parameter defines the length of the sliding window in which the

number of error blocks is counted. � Recommended value : 500� Set this parameter through ADD TYPRABQUALITYMEAS

� THD5A� Parameter name : Event 5A Threshold� Value range: 1 to 512 .� Physical value range: 1 to 512 . � Content: This parameter defines the threshold of the number of error blocks

within a sliding window. If the number of error blocks is equal to or greater than the parameter value, an event 5A is triggered.

� Recommended value : 280 � Set this parameter through ADD TYPRABQUALITYMEAS

Course Name


N-75


Parameters� HANGBLOCKNUM5A

� Parameter name : Interval Block Number Value


� HANGBLOCKNUM5A� Parameter name : Interval Block Number Value� Value range: 1 to 512 .� Physical value range: 1 to 512.� Content: This parameter defines the length of the pending timer after trigger

timer, which is started after an event 5A is triggered. . � Recommended value : 512.� Set this parameter through ADD TYPRABQUALITYMEAS

Course Name


N-76








Course Name


N-77


Downlink Quality Measurement � There are two measurement quantities related to the

downlink quality,

� Transmitted Code Power (TCP)

� RLC PDU retransmission rate.

� The measurement of TCP is implemented on the NodeB side. When the transmit power of the DPDCH is higher than the threshold of event Ea, it indicates that the radio link may be unstable.

� The RLC PDU retransmission rate is optional. It is controlled by the Srnc Downlink RLC QOS Action Trigger Indicator of Traffic BE parameter.

Course Name


N-78


Event E � Event E has two measurement thresholds, that is, threshold

1, and threshold 2.

� Event Ea means that the transmit power rises higher than

measurement threshold 1, and NodeB send TCP meas. report

� Event Eb means that the transmit power falls below

measurement threshold 2, and NodeB stop sending TCP meas.

Report

� Threshold 1 and 2 are calculated by the following formula:

3max POthresholdrelativepowerDLmumthresholdAbsolute +−=

� Where:� PO3 is the relative transmit power offset between pilot fields of the DPCCH and

DPDCHs. � The relative threshold is configured through the parameter Event Ea relative

threshold, and Event Eb relative threshold� Maximum DL power is defined through the RL Max DL TX power parameter that is

specific for the DPDCHs.

Course Name


N-79


Event E � Event E reporting mechanism

� When the transmit power of the pilot fields of the DPCCH remains above the measurement threshold 1 for a time period longer than T1 (the trigger time of event E which is set to 640 ms for BE service), event Ea is triggered. The NodeB periodically reports the measurement results of the transmit power to the RNC.

� When the transmit power of the pilot fields of the DPCCH remains below the measurement threshold 2 for a time period longer than T1 (the trigger time of event E which is set to 640 ms for BE service), event Eb is triggered. The NodeB stops reporting the measurement results of the transmit power.

Course Name


N-80


Parameters� EVENTEATHD

� Parameter name : Event Ea relative threshold

� Recommended value : 2, namely 1dB

� EVENTEBTHD

� Parameter name : Event Ea relative threshold


� EVENTEATHD� Parameter name : Event Ea relative threshold� Value range: 0 to 111 .� Physical value range: 0 to 55.5, Step: 0.5� Unit: dB � Content: Together with the maximum transmit power, this parameter defines

the event Ea threshold of the DL DPCCH power. � Recommended value : 2� Set this parameter through ADD TYPRABQUALITYMEAS

� EVENTEBTHD� Parameter name : Event Eb relative threshold� Value range: 0 to 111 .� Physical value range: 0 to 55.5, Step: 0.5� Unit: dB � Content: Together with the maximum transmit power, this parameter defines

the event Eb threshold of the DL DPCCH power. It is recommended that the value of Event Eb relative threshold be the same as that of Event Ea relative threshold. .

� Recommended value : 2� Set this parameter through ADD TYPRABQUALITYMEAS

Course Name


N-81


Parameters� DLBETRIGTIMEE

� Parameter name : Be trigger time of Event E

� Recommended value : 64, namely 640ms

� CHOICERPTUNITFORBEE

� Parameter name : Be Reporting period unit for event E

� Recommended value : TEN_MSEC

� DLBETRIGTIMEE� Parameter name : Be trigger time of Event E� Value range: 1 to 6000 � Physical value range: 10 to 60000 , Step: 10� Unit: ms� Content: This parameter defines the time allowance when the measured power

is higher than the threshold, so as to avoid the misreporting due to sudden fluctuation.

� Recommended value : 64� Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

� CHOICERPTUNITFORBEE� Parameter name : Be Reporting period unit for event E� Value range: TEN_MSEC, MIN .� Physical value range: None� Unit: dB � Content: The DL transmitted code power (if any) is reported periodically after

the event Ea is reported. The reporting period unit can be min or 10 ms. � Recommended value : TEN_MSEC� Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

Course Name


N-82


Parameters� TENMSECFORBEE

� Parameter name : Be Event E reporting period in 10ms


� MINFORBEE

� Parameter name : Be Event E reporting period in min

� Recommended value : None

� TENMSECFORBEE� Parameter name : Be Event E reporting period in 10ms� Value range: 1 to 6000 � Physical value range: 10 to 60000 , Step: 10� Unit: ms� Content: This parameter is valid when the Reporting period unit for event E

parameter is set to TEN_MSEC. The DL transmitted code power (if any) is reported periodically after the event Ea is reported.


� MINFORBEE� Parameter name : Be Event E reporting period in min� Value range: 1 to 60 .� Physical value range: None� Unit: ms � Content: This parameter is valid when the Reporting period unit for event E

parameter is set to MIN. The DL transmitted code power (if any) is reported periodically after the event E is reported. This parameter specifies the reporting period.

� Recommended value : None� Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

Course Name


N-83


Parameters� RLMAXDLPWR

� Parameter name : RL Max DL TX power


� RLMAXDLPWR� Parameter name : RL Max DL TX power� Value range: -350 to 150 � Physical value range: -35 to 15, Step: 0.1 � Unit: dB� Content: This parameter defines the maximum downlink transmit power of

radio link. This parameter has to meet the coverage requirement of the network planning, and the value is relative to the PCPICH transmit powerparameter that is set through the MOD CELL command.

� Recommended value : None� Set this parameter through ADD CELLRLPWR

Course Name


N-84


Event A� Event A: RLC retransmission value is above threshold for a

period

� RLC retransmission rate :

� The RLC PDU retransmission rate is calculated according to the ACK and NACK feedback information. The RLC PDU retransmission rate is optional. It is controlled by the SrncDownlink RLC QOS Action Trigger Indicator of Traffic BE parameter (through the SET QOSACT command).

� Each time a retransmission event A is triggered, RLC retransmission rate calculation needs to be suspended for a period of time (that is, re-TX monitor period x Event A pending time after trigger), during which RLC retransmission rate is not calculated. When RLC retransmission rate event report A is received, the downlink bandwidth can be downsized if an event Ea has already been reported.

Course Name


N-85


Parameters� EVENTATHRED

� Parameter name : Event A threshold

� Recommended value : 160, namely 16%

� TIMETOTRIGGERA

� Parameter name : Event A time to trigger


� EVENTATHRED� Parameter name : Event A threshold� Value range: 0 to 1000 .� Physical value range: 0% to 100%, Step: 0.1%� Content: This parameter defines the threshold of event A, which indicates that

a high ratio of PDUs are retransmitted. � Recommended value : 160� Set this parameter through ADD TYPRABRLC

� TIMETOTRIGGERA� Parameter name : Event A time to trigger � Value range: 0 to 100 .� Physical value range: None� Content: This parameter defines the time period of reporting event A before

event A is triggered.� Recommended value : 2� Set this parameter through ADD TYPRABRLC

Course Name


N-86


Parameters� PENDINGTIMEA

� Parameter name : Event A pending time after trigger


� MONITERPRD

� Parameter name : re-TX monitor period


� PENDINGTIMEA� Parameter name : Event A pending time after trigger� Value range: 0 to 1000 .� Physical value range: None� Content: This parameter defines the number of time periods which are the

pending time after event A is triggered.� Recommended value : 1� Set this parameter through ADD TYPRABRLC

� MONITERPRD� Parameter name : re-TX monitor period� Value range: 40 to 60000 .� Physical value range: 40 to 60000 � Unit: ms� Content: This parameter defines the period of monitoring PDU retransmission. � Recommended value : 1000� Set this parameter through ADD TYPRABRLC

Course Name


N-87


Event F� Event F is used to check whether the current transmit power

allows rate upsizing.

� Event F has two measurement thresholds, threshold 1, and

threshold 2.

� Event Fa means that the transmit power falls below threshold 1.

� Event Fb means that the transmit power rises above threshold 2.

� The threshold is calculated according to the following formula:

� where:� △P is the power difference between current rate and target rate which is calculated in

RNC through the parameters acquired by the simulation and field test results. � Pmargin is the event F reporting power margin (Event F reporting power margin).� Event Ea relative threshold is used to protect triggering event report Ea after

upsizing.� Pmax is the maximum DL power of target rate, that is, the maximum configured power

of the target rate.� PO3 is the relative transmit power offset between pilot fields of the DPCCH and

DPDCHs.� Though these parameters can be changed by using the MML commands on the LMT, it is

strongly recommended that no change be made to them.

Course Name


N-88


Event F � Event F reporting mechanism

� When the transmit power of the pilot fields of the DPCCH remains below the measurement threshold 1 for a time period longer than T1 (the trigger time of event F which is set to 640 ms for BE service), event Fa is triggered. Then the NodeB periodically reports the measurement results of the transmit power to the RNC.

� When the transmit power of the pilot fields of the DPCCH remains above the measurement threshold 2 for a time period longer than T1 (the trigger time of event F which is set to 640 ms for BE service), event Fb is triggered. The NodeB then stops reporting the measurement results of the transmit power.

Course Name


N-89


Parameters� PWRMARGIN

� Parameter name : Event F reporting power margin


� DLBETRIGTIMEF

� Parameter name : Be trigger time of Event F


� PWRMARGIN� Parameter name : Event F reporting power margin� Value range: 0 to 100 .� Physical value range: 0 to 10, Step: 0.1� Unit: dB � Content: This parameter defines the power margin applied when event F is

reported. � Recommended value : 10� Set this parameter through SET DCCC, ADD CELLDCCC

� DLBETRIGTIMEF� Parameter name : Be trigger time of Event F� Value range: 1 to 6000 .� Physical value range: 10 to 60000 � Unit: ms� Content: This parameter defines the time allowance when the measured power

is lower than the threshold, so as to avoid the misreporting due to sudden fluctuation.

� Recommended value : 64� Set this parameter through SET QUALITYMEAS , ADD CELLQUALITYMEAS

Course Name


N-90


Parameters� CHOICERPTUNITFORBEF

� Parameter name : Be Reporting period unit for event F

� Recommended value : TEN_MSEC

� TENMSECFORBEF

� Parameter name : Be Event F reporting period in 10ms


� CHOICERPTUNITFORBEF� Parameter name : Be Reporting period unit for event F� Value range: TEN_MSEC, MIN .� Physical value range: None � Content: The DL transmitted code power (if any) is reported periodically after

the event Fa is reported. The reporting period unit can be min or 10 ms. � Recommended value : TEN_MSEC� Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

� TENMSECFORBEF� Parameter name : Be Event F reporting period in 10ms� Value range: 1 to 6000 .� Physical value range: 10 to 60000 � Unit: ms� Content: This parameter is valid when the Be Reporting period unit for

event F parameter is set to TEN_MSEC. The DL transmitted code power (ifany) is reported periodically after the event Fa is reported.


Course Name


N-91


Parameters� MINFORBEF

� Parameter name : Be Event F reporting period in min


� MINFORBEF� Parameter name : Be Event F reporting period in min� Value range: 1 to 60 .� Physical value range: None � Unit: min� Content: This parameter is valid when the Be Reporting period unit for

event F parameter is set to MIN. The DL transmitted code power (if any) is reported periodically after the event F is reported.

� Recommended value : None� Set this parameter through SET QUALITYMEAS, ADD CELLQUALITYMEAS

Course Name


N-92








Course Name


N-93


Rate Downsizing � For rate downsizing based on uplink quality, only the 3-rate

downsizing 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 rateand lower than MBR, the rate is downsized to the value of

Uplink full coverage bit rate.

� The Uplink mid bit rate threshold parameter is the same as that described in Rate Reallocation Based on Traffic Volume.

� The Uplink mid bit rate threshold is the middle bit rate threshold for adjustment of the traffic volume in the uplink. When Uplink Rate decrease adjust level is 2_Rates, the middle bit rate for the rate reallocation based on uplink quality is equal to the RB rate closest to the highest rate divided by two. The bit rate is calculated in the RNC.

Course Name


N-94


Rate Downsizing � Rate downsizing based on uplink quality in the case of 3-

rate adjustment

Course Name


N-95


Parameters� ULFULLCVRRATE

� Parameter name : Uplink full coverage bit rate

� Recommended value : D64, namely 64kbit/s

� ULFULLCVRRATE� Parameter name : Uplink full coverage bit rate� Value range: D8, D16, D32, D64, D128, D144, D256, D384 .� Physical value range: 8, 16, 32, 64, 128, 144, 256, 384 � Unit: kbit/s� Content: This parameter defines the highest uplink rate that can reach its QoS

requirement throughout the whole cell. � Recommended value : D64 � Set this parameter through SET DCCC, ADD CELLDCCC.

Course Name


N-96


Rate Upsizing � Rate upsizing process based on uplink quality

Course Name


N-97


Rate Upsizing� If the RNC receives an event 6B2 but no event 6A2, rate

upsizing based on traffic-volume-related event 4a is allowed.

� If the RNC receives an event 6A2, rate upsizing based on

traffic-volume-related event 4a is not allowed. If the RNC

receives an event 6B1, rate downsizing is stopped and rate

upsizing is still prohibited.

Course Name


N-98








Course Name


N-99


Rate Downsizing � For rate downsizing based on downlink quality, only the 3-

rate downsizing 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.

� The Downlink mid bit rate threshold parameter is the same as that described in Rate Reallocation Based on Traffic Volume.

� The Downlink mid bit rate threshold is the middle bit rate threshold for adjustment of the traffic volume in the downlink. When Downlink Rate adjust level is 2_Rates, the middle bit rate for the rate reallocation based on downlink quality is equal to the RB rate closest to the highest rate divided by two. The bit rate is calculated in the RNC.

Course Name


N-100


Rate Downsizing� Rate downsizing based on downlink quality in the case of 3-

rate adjustment

Course Name


N-101


Parameters� DLFULLCVRRATE

� Parameter name : Downlink full coverage bit rate

� Recommended value : D64, namely 64kbit/s

� DLFULLCVRRATE� Parameter name : Downlink full coverage bit rate� Value range: D8, D16, D32, D64, D128, D144, D256, D384 .� Physical value range: 8, 16, 32, 64, 128, 144, 256, 384 � Unit: kbit/s� Content: This parameter defines the highest downlink rate that can reach its

QoS requirement throughout the whole cell. � Recommended value : D64 � Set this parameter through SET DCCC, ADD CELLDCCC.

Course Name


N-102


Rate Upsizing� Rate upsizing process based on downlink quality

� The rate upsizing process requires checking whether the current DL channel power is ample. Rate upsizing is allowed only when the DL channel power is ample. The above figure shows the process of rate upsizing based on downlink quality.

Course Name


N-103


Rate Upsizing� If event Fa is reported, it indicates that the DL channel

power is ample. Rate upsizing is then performed if event 4a

is reported.

� If event Fb is reported, it indicates that the DL channel

power is not ample. Then rate upsizing is prohibited.

Course Name


N-104








Course Name


N-105


Signaling Procedure of Rate Downsizing

� Signaling procedure of rate downsizing based on downlink

quality

� For detailed information about the signaling procedure of rate upsizing, see Signaling Procedure of Rate Reallocation Based on Traffic Volume.

Course Name


N-106







6. Always Online

Course Name


N-107


UE State Transition

� UE state transition and status of the RRC connection

� The above figure shows the RRC states in UTRA RRC connected mode, including transitions between UTRA RRC connected mode and GSM connected mode for CS domain services and transitions between UTRA RRC connected mode and GSM/GPRS packet modes for PS domain services. It also shows the transitions between idle mode and UTRA RRC connected mode, and the transitions within UTRA RRC connected mode. Only the state transitions within the UTRAN connected mode is described herein.

� The principles of UE state transition are as follows:� The state of the UE transits from CELL_DCH to CELL_FACH or from CELL_FACH to

CELL_PCH/URA_PCH if the activity of UE decreases.� The state of the UE transits from CELL_PCH/URA_PCH to CELL_FACH or from

CELL_FACH to CELL_DCH if the activity of UE increases.

Course Name


N-108


Contents5. UE State Transition Algorithm

5.1 UE State Transition From CELL_DCH to CELL_FACH

5.2 UE State Transition From CELL_FACH to CELL_PCH

5.3 UE State Transition From CELL_PCH to URA_PCH

5.4 UE State Transition From CELL_PCH or URA_PCH to CELL_FACH

5.5 UE State Transition From CELL_FACH to CELL_DCH

Course Name


N-109


From CELL_DCH to CELL_FACH� UE state transition from CELL_DCH to CELL_FACH

� When the RNC receives the 4b event report, the CELL_DCH to CELL_FACH transition timer and the uplink and downlink 4b counters are started on the RNC side. If both uplink and downlink 4b counters of traffic volume event 4b report are greater than or equal to a CELL_DCH to CELL_FACH transition threshold before the timer expires, the UE state transits from CELL_DCH to CELL_FACH when the timer expires.

Course Name


N-110


From CELL_DCH to CELL_FACH� The CELL_DCH to CELL_FACH transition threshold is the

rounded-down value of the following formula:

� CELL_DCH to CELL_FACH transition threshold = [CELL_DCH

to CELL_FACH transition time / (time to trigger + pending time

after trigger) * state transition traffic redundancy coefficient]

� where:� CELL_DCH to CELL_FACH transition time, time to trigger, and pending time after

trigger are set through the parameters listed in the following table.� State transition traffic redundancy coefficient is used to avoid detecting UE in low-

activity state incorrectly due to the loss of measurement reports. The value of this coefficient is set to 80%.

� Parameters used for UE state transition from CELL_DCH to CELL_FACH

Course Name


N-111


From CELL_DCH to CELL_FACH� UE state transition is not applicable in the following cases:

� For BE services on the DCH:

� If PS_BE_STATE_TRANS_SWITCH is set to OFF, or other

services which cannot perform state transition are configured for

the UE, no state transition is performed on the UE.

� Instead, if both uplink and downlink 4b counters of traffic volume event 4b report are greater than or equal to a CELL_DCH to CELL_FACH transition threshold when the CELL_DCH to CELL_FACH transition timer expires, the UE is reconfigured to the low-activity rate that is defined through the Low activity bit rate threshold parameter.

� However, if the value of Low activity bit rate threshold is greater than or equal to that of Uplink/Downlink bit rate threshold for DCCC, the reconfiguration to Low activity bit rate threshold is prohibited.

Course Name


N-112



� For BE services on the HS-DSCH or E-DCH,

� If PS_BE_STATE_TRANS_SWITCH or

HSDPA_STATE_TRANS_SWITCH/HSUPA_STATE_TRANS_SWITCH is set to OFF, or other services which cannot perform state

transition are configured for the UE, the UE does not undergo

state transition.

Course Name


N-113



� For real-time PS services,

� If PS_NON_BE_STATE_TRANS_SWITCH is set to OFF, or other

services which cannot perform state transition are configured for

the UE, the UE does not undergo state transition.

Course Name


N-114


Parameters� PS_BE_STATE_TRANS_SWITCH

� Parameter name : PS_BE_STATE_TRANS_SWITCH

� Recommended value : 0, namely OFF

� PS_NON_BE_STATE_TRANS_SWITCH

� Parameter name : PS_NON_BE_STATE_TRANS_SWITCH


� PS_BE_STATE_TRANS_SWITCH� Parameter name : PS_BE_STATE_TRANS_SWITCH� Value range: Enum (0,1) .� Physical value range: Enum (0,1) � Content: If this parameter is set to 1, UE RRC state transitions

(CELL_FACH/CELL_PCH/URA_PCH) for services are allowed in the RNC. . � Recommended value : 0� Set this parameter through SET CORRMALGOSWITCH

� PS_NON_BE_STATE_TRANS_SWITCH� Parameter name : PS_NON_BE_STATE_TRANS_SWITCH� Value range: Enum (0,1) .� Physical value range: Enum (0,1) � Content: If this parameter is set to 1, UE RRC state transitions to CELL_FACH

for real-time services are allowed in the RNC. � Recommended value : 0� Set this parameter through SET CORRMALGOSWITCH

Course Name


N-115


Parameters� HSDPA_STATE_TRANS_SWITCH

� Parameter name : HSDPA_STATE_TRANS_SWITCH


� HSUPA_STATE_TRANS_SWITCH

� Parameter name : HSUPA_STATE_TRANS_SWITCH


� HSDPA_STATE_TRANS_SWITCH� Parameter name : HSDPA_STATE_TRANS_SWITCH � Value range: Enum (0,1) .� Physical value range: Enum (0,1) � Content: When it is checked, UE RRC state transitions to CELL_FACH for the

DCCC algorithm of HSDPA services are allowed in the RNC. When the RAB on HS-DSCH is BE service, the PS_BE_STATE_TRANS_SWITCH is checked simultaneously, and when the RAB on HS-DSCH is PS real-time traffic, the PS_NON_BE_STATE_TRANS_SWITCH is checked simultaneously.

� Recommended value : 0� Set this parameter through SET CORRMALGOSWITCH

� HSUPA_STATE_TRANS_SWITCH� Parameter name : HSUPA_STATE_TRANS_SWITCH � Value range: Enum (0,1) .� Physical value range: Enum (0,1) � Content: When it is checked, UE RRC state transitions to CELL_FACH for the

DCCC algorithm of HSUPA services are allowed in the RNC. When the RAB on E-DCH is BE service, the PS_BE_STATE_TRANS_SWITCH is checked simultaneously, and when the RAB on E-DCH is PS real-time traffic, the PS_NON_BE_STATE_TRANS_SWITCH is checked simultaneously.

� Recommended value : 0� Set this parameter through SET CORRMALGOSWITCH

Course Name


N-116


Parameters (BE DCH)� DTOFSTATETRANSTIMER

� Parameter name : BE DCH to FACH transition timer

� Recommended value : 5, namely 5s

� D2F2PTVMTHD

� Parameter name : BE DCH to F/RACH or F/RACH to PCH 4b

threshold

� Recommended value : D64 , namely 64byte

� DTOFSTATETRANSTIMER� Parameter name : BE DCH to FACH transition timer � Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s� Content: This parameter is used to detect the stability of a UE in low activity in

CELL_DCH state. Configuration of the parameter is based on the BE service model on DCH.

� Recommended value : 5� Set this parameter through SET UESTATETRANS

� D2F2PTVMTHD� Parameter name : BE DCH to F/RACH or F/RACH to PCH 4b threshold � Value range: D8, D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k,

D6k, D8k, D12k, D16k, D24k, D32k, D48k, D64k, D96k, D128k, D192k, D256k, D384k, D512k, D768k .

� Physical value range: 8, 16, 32, 64, 128, 256, 512, 1024, 2k, 3k, 4k, 6k, 8k, 12k, 16k, 24k, 32k, 48k, 64k, 96k, 128k, 192k, 256k, 384k, 512k, 768k

� Unit: byte� Content: This threshold is used to check whether a UE is in low-activity state. If

the UE is in CELL_DCH state, the BE DCH to FACH transition timerincreases every time the UE reports event 4b. If the UE is in CELL_FACH state, the BE DCH to FACH transition timer increases every time the UE reports event 4b when the traffic volume is 0.

� Recommended value : D64� Set this parameter through SET UESTATETRANS

Course Name


N-117


Parameters (BE DCH)� D2FTVMTIMETOTRIG

� Parameter name : BE DCH to F/RACH 4b time to trigger


� D2FTVMPTAT

� Parameter name : BE DCH to F/RACH 4b Pending Time after

trigger


� D2FTVMTIMETOTRIG� Parameter name : BE DCH to F/RACH 4b time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,


1280, 2560, 5000 � Unit: ms� Content: When the traffic volume is lower than BE DCH to F/RACH or

F/RACH to PCH 4b threshold for a period of time defined by this parameter, the UE reports event 4b. This parameter is used to avoid triggering unnecessary events caused by unstable traffic volumes.


� D2FTVMPTAT� Parameter name : BE DCH to F/RACH 4b Pending Time after trigger� Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 .� Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 � Unit: ms� Content: This parameter defines the time interval of reporting event 4b. This

parameter is used to avoid too frequent event 4b reports. � Recommended value : D16000� Set this parameter through SET UESTATETRANS

Course Name


N-118


Parameters (BE HS-DSCH)� BEH2FSTATETRANSTIMER

� Parameter name : BE HS-DSCH to FACH transition timer

� Recommended value : 180 , namely 180s

� BEH2FTVMTHD

� Parameter name : BE HS-DSCH to FACH 4b threshold


� BEH2FSTATETRANSTIMER� Parameter name : BE HS-DSCH to FACH transition timer� Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s� Content: This parameter is used to detect the stability of a UE in low activity in

CELL_DCH (with HS-DSCH) state. Configuration of the parameter is based on the BE service model on HS-DSCH.


� BEH2FTVMTHD� Parameter name : BE HS-DSCH to FACH 4b threshold� Value range: D8, D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k,



� Unit: byte� Content: This threshold is used to check whether a UE is in low-activity state. If

the traffic volume is lower than this threshold for a certain period, event 4b is reported when the UE in CELL_DCH (with HS-DSCH) state.


Course Name


N-119


Parameters (BE HS-DSCH)� BEH2FTVMTIMETOTRIG

� Parameter name : BE HS-DSCH to FACH 4b time to trigger


� BEH2FTVMPTAT

� Parameter name : BE HS-DSCH to FACH 4b Pending Time

after trigger


� BEH2FTVMTIMETOTRIG� Parameter name : BE HS-DSCH to FACH 4b time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,


1280, 2560, 5000 � Unit: ms� Content: When the traffic volume is lower than the lower threshold for a period

of time defined by this parameter, the UE reports event 4b. This parameter is used to avoid triggering unnecessary events caused by unstable traffic volumes.


� BEH2FTVMPTAT� Parameter name : BE HS-DSCH to FACH 4b Pending Time after trigger� Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 .� Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 � Unit: ms� Content: This parameter defines the time interval of reporting event 4b. This


Course Name


N-120


Parameters (Realtime Traff DCH)� RTDH2FSTATETRANSTIMER

� Parameter name : Realtime Traff DCH or HSPA to FACH

transition timer


� RTDH2FTVMTHD

� Parameter name : Realtime Traff DCH or HSPA to FACH 4b

threshold


� RTDH2FSTATETRANSTIMER� Parameter name : Realtime Traff DCH or HSPA to FACH transition timer� Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s� Content: This timer is used to check whether a real-time service UE in

CELL_DCH state is in stable low-activity state. Configuration of the parameter is based on the RT service model.


� RTDH2FTVMTHD� Parameter name : Realtime Traff DCH or HSPA to FACH 4b threshold� Value range: D8, D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k,



� Unit: byte� Content: This threshold is used to check whether a UE is in low-activity state.

The CELL_DCH to CELL_FACH transition timer increases 1 every time the UE in CELL_DCH state reports event 4b.


Course Name


N-121


Parameters (Realtime Traff DCH)� RTDH2FTVMTIMETOTRIG

� Parameter name: Realtime Traff DCH or HSPA to FACH 4b

time to trigger


� RTDH2FTVMPTAT

� Parameter name: Realtime Traff DCH or HSPA to FACH 4b

pending time


� RTDH2FTVMTIMETOTRIG� Parameter name : Realtime Traff DCH or HSPA to FACH 4b time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,





� RTDH2FTVMPTAT� Parameter name : Realtime Traff DCH or HSPA to FACH 4b pending time� Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 .� Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 � Unit: ms� Content: This parameter defines the time interval of reporting event 4b. This


Course Name


N-122


Parameters (E-DCH)� E2FTHROUMEASPERIOD

� Parameter name : E-DCH Throu Meas Period


� E2FSTATETRANSTIMER

� Parameter name : E-DCH to FACH State Transformation Timer


� E2FTHROUMEASPERIOD� Parameter name : E-DCH Throu Meas Period� Value range: 1 to 10000 .� Physical value range: 10 ms to 100s � Unit: 10ms� Content: This parameter defines the period of throughput measurement. An

extremely low value of this parameter leads to great fluctuation of the obtained throughput, which results in unexpected reporting of events 4a and 4b.


� E2FSTATETRANSTIMER� Parameter name : E-DCH to FACH State Transformation Timer � Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s� Content: This timer is used to check whether a UE in CELL_DCH state with E-

DCH bearer is in stable low-activity state. � Recommended value : 180� Set this parameter through SET UESTATETRANS

Course Name


N-123


Parameters (E-DCH)� E2FTHROUTHD

� Parameter name : E-DCH to FACH 4b Threshold

� Recommended value : 8, namely 8byte

� E2FTHROUTIMETOTRIG

� Parameter name: E-DCH to FACH 4b Period Amount To

Trigger


� E2FTHROUTHD� Parameter name : E-DCH to FACH 4b Threshold � Value range: 0 to 384 .� Physical value range: 0 to 384 � Unit: kbit/s� Content: This parameter determines whether the UE is in low-activity state. For

the UE on the E-DCH, the counter for checking low activity increases by 1 each time the 4b throughput event is reported.


� E2FTHROUTIMETOTRIG� Parameter name : E-DCH to FACH 4b Period Amount To Trigger� Value range: 0 to 1023 .� Physical value range: 0 to 1023 � Content: If the throughput is lower than E-DCH to FACH 4b Threshold for the

times defined by this parameter, the UE reports event 4b. This parameter is used to avoid unnecessary triggering of throughput events caused by unstable throughput.


Course Name


N-124


Parameters (Realtime Traff DCH)� E2FTHROUPTAT

� Parameter name: E-DCH to FACH 4b Pending Period Amount

After Trigger


� LITTLERATETHD

� Parameter name: Low activity bit rate threshold

� Recommended value: 64, namely 64kbit/s

� E2FTHROUPTAT� Parameter name : E-DCH to FACH 4b Pending Period Amount After Trigger� Value range: 0 to 1023 .� Physical value range: 0 to 1023 � Content: This parameter defines the time interval for a second event 4b report

after the first event 4b report. This parameter is used to avoid frequent event 4b reports.


� LITTLERATETHD� Parameter name : Low activity bit rate threshold� Value range: D0, D8, D16, D32, D64, D128, D144, D256, D384 .� Physical value range: 0, 8, 16, 32 ,64, 128, 144, 256, 384 � Unit: kbit/s� Content: When a UE fails to transit from CELL_DCH to CELL_FACH state

because the switch of state transition algorithm is off or multiple services are configured for the UE, the UE is reconfigured to the value of Low activity bit rate threshold, which is configured on the LMT.

� Recommended value : 64� Set this parameter through SET DCCC

Course Name


N-125








Course Name


N-126


From CELL_FACH to CELL_PCH � This UE state transition occurs when only the BE service of

the PS domain exists.

� The procedure of UE state transition from CELL_FACH to

CELL_PCH is similar to that of UE state transition from

CELL_DCH to CELL_FACH.

� When the RNC receives the 4b report in which the traffic volume is zero, the CELL_FACH to CELL_PCH transition timer and the uplink and downlink 4b counters are started on the RNC side. If both uplink and downlink 4b counters of traffic volume event 4b report are greater than or equal to a CELL_FACH to CELL_PCH transition threshold before the timer expires, the UE state transits from CELL_FACH to CELL_PCH when the timer expires.

Course Name


N-127


From CELL_FACH to CELL_PCH � The CELL_FACH to CELL_PCH transition threshold is the

rounded-down value of the following formula:

� CELL_FACH to CELL_PCH transition threshold =

[CELL_FACH to CELL_PCH transition time / (time to trigger +

pending time after trigger) * State transition traffic redundancy

coefficient]

� This table lists the parameters used to calculate the threshold for UE state transition from CELL_FACH to CELL_PCH.

Course Name


N-128


Parameters� FTOPSTATETRANSTIMER

� Parameter name : BE FACH to PCH transition timer


� F2PTVMTIMETOTRIG

� Parameter name: BE FACH to PCH 4b time to trigger


� FTOPSTATETRANSTIMER� Parameter name : BE FACH to PCH transition timer� Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s � Content: This timer is used to check whether the UE in CELL_FACH state is in

stable low-activity state. Therefore, zero traffic event is used to determine the need for transition from FACH to PCH.


� F2PTVMTIMETOTRIG� Parameter name : BE FACH to PCH 4b time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,





Course Name


N-129


Parameters� F2PTVMPTAT

� Parameter name : BE FACH to PCH 4b Pending Time after

trigger


� F2PTVMPTAT� Parameter name : BE FACH to PCH 4b Pending Time after trigger� Value range: D250, D500, D1000, D2000, D4000, D8000, D16000 .� Physical value range: 250, 500, 1000, 2000, 4000, 8000, 16000 � Unit: ms � Content: This parameter defines the time interval of reporting event 4b. This


Course Name


N-130








Course Name


N-131


From CELL_PCH to URA_PCH � This UE state transition occurs when only the BE service of the

PS domain exists.

� 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 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 exceed the threshold . In this case, the RNC initiates the state transition when the UE sends the CELL UPDATE message again.

� The state transition from CELL_PCH to URA_PCH involves the transient state CELL_FACH, in which some necessary signaling interaction is performed.

Course Name


N-132


Parameters� CELLRESELECTTIMER

� Parameter name : Cell reselection timer


� CELLRESELECTCOUNTER

� Parameter name: Cell reselection counter


� CELLRESELECTTIMER� Parameter name : Cell reselection timer � Value range: 1 to 65535 .� Physical value range: 1 to 65535 � Unit: s � Content: This parameter is used to check whether a UE is in the state of

frequent cell reselections. � Recommended value : 180� Set this parameter through SET UESTATETRANS

� CELLRESELECTCOUNTER� Parameter name : Cell reselection counter � Value range: 1 to 65535 � Physical value range: 1 to 65535 � Content: For a UE in CELL_PCH state, if the number of cell reselections

exceeds this parameter within the period defined by Cell reselection timer, it is determined that the UE is in the state of frequent cell reselections.


Course Name


N-133








Course Name


N-134


From CELL_PCH or URA_PCH to CELL_FACH

� The state of the UE transits to CELL_FACH when the UE is

paged by UTRAN, or the UE needs to exchange messages

with the network.

Course Name


N-135








Course Name


N-136


From CELL_FACH to CELL_DCH� The state of the UE transits to CELL_DCH when the

UTRAN receives a report which indicates that the UL or DL

traffic volume exceeds a 4a threshold.

� Parameters used for UE state transition from CELL_FACH to CELL_DCH

Course Name


N-137


Parameters (BE F/RACH to DCH)� FTODTVMTHD

� Parameter name : BE F/RACH to DCH 4a threshold

� Recommended value : D1024, namely 1024byte

� FTODTVMTIMETOTRIG

� Parameter name: BE F/RACH to DCH 4a time to trigger


� FTODTVMTHD� Parameter name : BE F/RACH to DCH 4a threshold� Value range: D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k,

D8k, D12k, D16k, D24k, D32k, D48k, D64k, D96k, D128k, D192k, D256k, D384k, D512k, D768k .

� Physical value range: 16, 32, 64, 128, 256, 512, 1024, 2k, 3k, 4k, 6k, 8k, 12k, 16k, 24k, 32k, 48k, 64k, 96k, 128k, 192k, 256k, 384k, 512k, 768k

� Unit: byte � Content: Upper threshold for triggering the traffic volume event 4a for state

transition from FACH to DCH. If the value of this parameter is too high, congestion may happen over the common channel.


� FTODTVMTIMETOTRIG� Parameter name : BE F/RACH to DCH 4a time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,

D320, D640, D1280, D2560, D5000 � Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640,

1280, 2560, 5000 � Unit: ms� Content: This parameter defines the time-to-trigger for event 4a, that is, the

transition from FACH to DCH. This parameter is used to avoid unnecessary reports caused by unstable traffic volumes.

� Recommended value : D240 � Set this parameter through SET UESTATETRANS

Course Name


N-138


Parameters (BE FACH to HS-DSCH)

� BEFTOHTVMTHD

� Parameter name : BE FACH to HS-DSCH 4a threshold


� BEFTOHTVMTIMETOTRIG

� Parameter name: BE FACH to HS-DSCH 4a time to trigger


� BEFTOHTVMTHD� Parameter name : BE FACH to HS-DSCH 4a threshold� Value range: D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k,




transition from FACH to DCH (with HS-DSCH). If the value of this parameter is too high, congestion may happen over the common channel.


� BEFTOHTVMTIMETOTRIG� Parameter name : BE FACH to HS-DSCH 4a time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



transition from FACH to DCH (with HS-DSCH). This parameter is used to avoid unnecessary reports caused by unstable traffic volumes.


Course Name


N-139


Parameters (Realtime Traff FACH to DCH or HSPA)� RTFTODHTVMTHD

� Parameter name : Realtime Traff FACH to DCH or HSPA 4a

threshold


� RTFTODHTVMTIMETOTRIG

� Parameter name: Realtime Traff FACH to DCH or HSPA 4a

time to trigger


� RTFTODHTVMTHD� Parameter name : Realtime Traff FACH to DCH or HSPA 4a threshold� Value range: D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k,




transition from FACH to DCH. If the value of this parameter is too high, congestion may happen over the common channel..


� RTFTODHTVMTIMETOTRIG� Parameter name : Realtime Traff FACH to DCH or HSPA 4a time to trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



transition from FACH to DCH. This parameter is used to avoid unnecessary reports caused by unstable traffic volumes.


Course Name


N-140


Parameters (FACH to E-DCH)

� FTOETVMTHD

� Parameter name : FACH to E-DCH 4a Threshold


� FTOETVMTIMETOTRIG

� Parameter name: FACH to E-DCH 4a Time To Trigger


� FTOETVMTHD� Parameter name : FACH to E-DCH 4a Threshold� Value range: D16, D32, D64, D128, D256, D512, D1024, D2k, D3k, D4k, D6k,



� Unit: byte � Content: This parameter determines the upper threshold of traffic volume for

event 4a triggering the transition from FACH to E-DCH. � Recommended value : D1024� Set this parameter through SET UESTATETRANS

� FTOETVMTIMETOTRIG� Parameter name : FACH to E-DCH 4a Time To Trigger� Value range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240,



transition from FACH to E-DCH. This parameter is used to avoid unnecessary reports caused by fluctuation of traffic volumes.


Course Name


N-141







6. Always Online

Course Name


N-142


Always Online� If there is no data transmission for a PS service of a UE, the

connection for the service is released, but the CN reserves

the Packet Data Protocol (PDP) context of the PS service

for the UE.

� When the UE reinitiates the service of this PDP context, it

does not have to apply for the PDP context again. Therefore,

the PS UE is 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, and requests the RNC to release the corresponding radio resources. However, the CN reserves the PDP context for the PS UE. When the UE reinitiates the service of this PDP context, it does not have to apply for the PDP context again. Therefore, the PS UE is always online.

Course Name


N-143


Always Online� For each PS RAB, two PDCP timers are available. They are

T1 and T2.

� T1 and T2 are RNC-oriented; they can be set differently for

the conversational service, streaming service, interactive

service, background service, and IMS signaling.

� In RAN10.0, T1 and T2 are both set to 20 s for all the above services.

Course Name


N-144


Process Description � For each PS RAB, two PDCP

timers are available. They are T1 and T2

� T1 and T2 are RNC-oriented; they can be set differently for the conversational service, streaming service, interactive service, background service, and IMS signaling.

� When the PDCP entity of a service is set up, timer T1 is started. � When timer T1 expires and the PDCP entity still detects no data packet either in UL or DL, the

PDCP entity sends the request to the RRC layer for the service release and timer T2 is started. � If the CN does not initiate the service release, and the PDCP still detects no UL or DL data

packet when timer T2 expires, the PDCP entity sends the request again to the RRC layer for the service release.

� If there is only one RAB for the UE in the PS domain, the RNC sends an IU RELEASE REQUEST message to the CN.

� If there is more than one RAB for the UE in the PS domain, the RNC sends an RAB RELEASE REQUEST message to the CN.

� The release cause carried in both messages is "User Inactivity".� When the CN receives the message, it initiates the release procedure.

Course Name


N-145


Parameters

� PSINACTTMRFORCON

� Parameter name : Conversational service T1

� PROTECTTMRFORCON

� Parameter name: Conversational service T2

� PSINACTTMRFORSTR

� Parameter name: Streaming service T1

� PROTECTTMRFORSTR

� Parameter name: Streaming service T2

Course Name


N-146


Parameters

� PSINACTTMRFORINT

� Parameter name : Interactive service T1

� PROTECTTMRFORINT

� Parameter name: Interactive service T2

� PSINACTTMRFORBAC

� Parameter name: Background service T1

� PROTECTTMRFORBAC

� Parameter name: Background service T2

Course Name


N-147


Parameters

� PSINACTTMRFORIMSSIG

� Parameter name: IMS signal T1

� PROTECTTMRFORIMSSIG

� Parameter name: IMS signal T2

� Recommended value for all the above 10 parameters:

� 20, namely 20s

� Description for all the above parameters (T1 and T2):� T1:

� Value range: 0 to 14400 � Physical value range: 0 to 14400 � Unit: s � Content: When the T1 timer expires and there is still no data transmission for

the UE in the PS interactive service, the PDCP entity sends a request to the RRC layer for release of the service.

� Recommended value : 20� Set this parameter through SET PSINACTTIMER

� T2:� Value range: 0 to 60 � Physical value range: 0 to 60 � Unit: s � Content: When the T1 timer expires, the PDCP entity sends a request to the

RRC layer for release of the interactive service and the T2 timer is started. If the service is not released when the T2 timer expires, the PDCP entity sends again the request to the RRC layer for release of the service.

� Recommended value : 20� Set this parameter through SET PSINACTTIMER

Course Name


N-148


Summary� In this course, we have discussed DCCC Algorithm:

� Rate Reallocation Based on Traffic Volume

� Rate Reallocation Based on Throughput

� Rate Reallocation Based on Link Quality

� UE State Transition Algorithm

� Always Online

Course Name


N-149

Thank youwww.huawei.com

05 OWJ200105 WCDMA DCCC Algorithm and Parameters ISSUE1

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