9 wcdma ran12 dccc algorithm and parameters issue1.00
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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA DCCC Algorithm and
Parameters
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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
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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
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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
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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
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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
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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
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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
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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
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Contents
2. DCCC Based on Traffic Volume
2.1 Traffic Volume Measurement and Event Reporting
2.2 Rate Adjustment Based on Traffic Volume
2.3 Signaling Procedure
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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
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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
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Event 4a
Event 4a triggered by an increase in the transport
channel traffic volume:
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Event 4b
Event 4b triggered by a decrease in the transport
channel traffic volume:
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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:
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Contents
2. Rate Reallocation Based on Traffic Volume
2.1 Traffic Volume Measurement and Event Reporting
2.2 Rate Adjustment Based on Traffic Volume
2.3 Signaling Procedure
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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
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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
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Rate Adjustment Strategy in UL (Cont.) Principles of RATE_UP_ONLY_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 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
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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
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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
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Example of UL Rate Adjustment Rate adjustment when the UL rate increase and
decrease level are 2_Rates:
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Example of UL Rate Adjustment (Cont.) Rate adjustment when the UL rate increase and
decrease level are 3_Rates:
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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
Recommended value: 3_Rates
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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
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Rate Adjustment Strategy in DL Principles of RATE_UP_AND_DOWN_ON_DCH in DL:
Rate upsizing is performed if the RNC receives a report
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
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Rate Adjustment Strategy in DL (Cont.) Principles of RATE_UP_ONLY_ON_DCH in DL:
Rate upsizing is performed if the RNC receives a report
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
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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
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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
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Parameters of Traffic Volume (Cont.) DlRateUpAdjLevel
Parameter name: Downlink Rate Increase Adjust Level
Recommended value: 3_Rates
DlRateDnAdjLevel
Parameter name: Downlink Rate Decrease Adjust Level
Recommended value: 3_Rates
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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
Recommended value: D128, namely 128kbit/s
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Contents
2. Rate Reallocation Based on Traffic Volume
2.1 Traffic Volume Measurement and Event Reporting
2.2 Rate Adjustment Based on Traffic Volume
2.3 Signaling Procedure
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Signaling Procedure
Signaling procedure of UL rate upsizing based on
traffic volume:
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Signaling Procedure (Cont.)
Signaling procedure of UL rate downsizing based on
traffic volume:
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Signaling Procedure (Cont.)
Signaling procedure of DL rate upsizing based on
traffic volume:
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Signaling Procedure (Cont.)
Signaling procedure of DL rate downsizing based on
traffic volume:
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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
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Contents
3. DCCC Based on Throughput
3.1 Throughput Measurement and Event Reporting
3.2 Rate Adjustment Based on Throughput
3.3 Signaling Procedure
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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
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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
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Throughput Measurement Event (Cont.) Mechanism of measuring the throughput and
reporting events 4a and 4b:
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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
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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
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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
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Parameters of Throughput
DraSwitch-DRA_HSUPA_DCCC_SWITCH
Parameter name: Dynamic resource allocation switch
for HSUPA DCCC function
Recommended value: ON
CfgSwitch-THROU_DCCC_SWITCH
Parameter name: Dynamic resource allocation switch
for throughput-based DCCC function
Recommended value: OFF
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Parameters of Throughput (Cont.) E2FThrouMeasPeriod
Parameter name: E-DCH Throu Meas Period
Recommended value: 30, namely 300ms
DchThrouMeasPeriod
Parameter name: DCH Throu Meas Period
Recommended value: 100, namely 1000ms
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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:
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Parameters of Throughput (Cont.) EdchRateAdjustSet
Parameter name: HSUPA UpLink Rate Adjust Set
Recommended value:
RATE_8KBPS-0, RATE_16KBPS-0, RATE_32KBPS-0,
RATE_64KBPS-0, RATE_128KBPS-1, RATE_144KBPS-0,
RATE_256KBPS-1, RATE_384KBPS-0, RATE_608KBPS-1,
RATE_1440KBPS-0, RATE_2048KBPS-0, RATE_2880KBPS-0,
RATE_5740KBPS-0
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Parameters of Throughput (Cont.) E2FThrouThd
Parameter name: E-DCH2F 4B Threshold
Recommended value: 8, namely 8kbit/s
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Contents
3. DCCC Based on Throughput
3.1 Throughput Measurement and Event Reporting
3.2 Rate Adjustment Based on Throughput
3.3 Signaling Procedure
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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
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Parameters of Throughput (Cont.) HsupaDcccStg
Parameter name: HSUPA DCCC Strategy
Recommended value: RATE_UP_AND_DOWN_ON_EDCH
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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
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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"
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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
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Contents
3. Rate Reallocation Based on Throughput
3.1 Throughput Measurement and Event Reporting
3.2 Rate Adjustment Based on Throughput
3.3 Signaling Procedure
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Signaling Procedure
Signaling procedure of rate increase based on
throughput:
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Signaling Procedure (Cont.)
Signaling procedure of rate decrease based on
throughput:
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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
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Contents
4. DCCC Based on Link Stability
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
4.5 Signaling Procedure
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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
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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
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Parameters of Link Stability
BeUlEvTrigInd
Parameter name: Indicator For BE Uplink QOS Event
Recommended value: SINGLE
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Parameters of Link Stability (Cont.) BeUlQos6A1McSwitch
Parameter name: Measurement Of 6A1 Switch
Recommended value: YES
BeUlQos5AMcSwitch
Parameter name: Measurement Of 5A Switch
Recommended value: YES
BeUlQos6DMcSwitch
Parameter name: Measurement Of 6D Switch
Recommended value: NO
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Events 6A and 6B
Events 6A1, 6A2, 6B1 and 6B2:
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Event 6D
Event 6D:
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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
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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
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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
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Event 5A
Event 5A:
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Parameters of Link Stability (Cont.) StaBlkNum5A
Parameter name: Statistic Block Number For 5A Event
Recommended value: None
Thd5A
Parameter name: Event 5A Threshold
Recommended value: None
HangBlockNum5A
Parameter name: Interval Block Number
Recommended value: None
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Contents
4. DCCC Based on Link Stability
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
4.5 Signaling Procedure
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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
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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
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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
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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
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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)
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Parameters of Link Stability (Cont.) 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
TenMsecForBeE
Parameter name: BE Event E Reporting Period In 10ms
Recommended value: 480, namely 4800ms
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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
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Event F (Cont.)
Event F reporting mechanism:
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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
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Parameters of Link Stability (Cont.) DlBeTrigTimeF
Parameter name: BE Trigger Time Of Event F
Recommended value: 64, namely 640ms
ChoiceRptUnitForBeF
Parameter name: BE Reporting Period Unit For Event F
Recommended value: TEN_MSEC
TenMsecForBeF
Parameter name: BE Event F Reporting Period In 10ms
Recommended value: 480, namely 4800ms
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Event A
Event A reporting mechanism:
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Parameters of Link Stability (Cont.) SrncBeDlRlcQosSwitch
Parameter name: Srnc Parameter for BE Downlink RLC
QOS
Recommended value: YES
MoniterPrd
Parameter name: re-TX monitor period
Recommended value: 1000, namely 1000ms
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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
Recommended value: 1
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Contents
4. DCCC Based on Link Stability
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
4.5 Signaling Procedure
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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
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Rate Decrease in UL (Cont.)
Rate decrease based on uplink stability in the case
of 3-Rates adjustment:
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Parameters of Link Stability (Cont.) UlFullCvrRate
Parameter name: Uplink Full Coverage Bit Rate
Recommended value: D64, namely 64kbit/s
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Rate Increase in UL
Rate increase procedure based on uplink stability:
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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
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Contents
4. DCCC Based on Link Stability
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
4.5 Signaling Procedure
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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
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Rate Decrease in DL (Cont.)
Rate decrease based on downlink stability in the
case of 3-Rates adjustment:
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Parameters of Link Stability (Cont.) DlFullCvrRate
Parameter name: Downlink Full Coverage Bit Rate
Recommended value: D64, namely 64kbit/s
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Rate Increase in DL
Rate increase procedure based on downlink stability:
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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
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Contents
4. DCCC Based on Link Stability
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
4.5 Signaling Procedure
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Signaling Procedure
Signaling procedure of rate decrease based on
downlink stability:
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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
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Contents
5. DCCC Based on Basic Congestion
5.1 Rate Adjustment Based on Uplink Congestion
5.2 Rate Adjustment Based on Downlink Congestion
5.3 Rate Increase Failure and Penalty
5.4 Signaling Procedure
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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
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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
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Rate Adjustment Based on Uplink Congestion (Cont.)
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Contents
5. DCCC Based on Basic Congestion
5.1 Rate Adjustment Based on Uplink Congestion
5.2 Rate Adjustment Based on Downlink Congestion
5.3 Rate Increase Failure and Penalty
5.4 Signaling Procedure
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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
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Rate Adjustment Based on Downlink Congestion (Cont.)
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Contents
5. DCCC Based on Basic Congestion
5.1 Rate Adjustment Based on Uplink Congestion
5.2 Rate Adjustment Based on Downlink Congestion
5.3 Rate Increase Failure and Penalty
5.4 Signaling Procedure
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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
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Rate Increase Failure and Penalty (Cont.) Rate increase failure penalty in the case of 2_Rates
adjustment:
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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
Recommended value: 4
DcccUpPenaltyLen
Parameter name: DCCC Rate Up Fail Penalty Time Length
Recommended value: 30, namely 30s
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Contents
5. DCCC Based on Basic Congestion
5.1 Rate Adjustment Based on Uplink Congestion
5.2 Rate Adjustment Based on Downlink Congestion
5.3 Rate Increase Failure and Penalty
5.4 Signaling Procedure
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Signaling Procedure
Signaling procedure of rate decrease based on UL/DL
basic congestion:
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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
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Contents
6. UE State Transition
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
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UE State Transition
UE state transitions:
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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
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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:
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Contents
6. UE State Transition
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
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CELL_DCH to CELL_FACH
UE state transition from CELL_DCH to CELL_FACH:
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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]
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CELL_DCH to CELL_FACH (Cont.)
Service Type
CELL_DCH to CELL_FACH
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:
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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:
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Parameters of UE State Transition (Cont.)
Parameter Parameter nameRecommended
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:
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Parameters of UE State Transition (Cont.)
Parameter Parameter nameRecommended
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:
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Parameters of UE State Transition (Cont.)
Parameter Parameter nameRecommended
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:
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Parameters of UE State Transition (Cont.) LittleRateThd
Parameter name: Low Activity Bit Rate Threshold
Recommended value: D64, namely 64kbit/s
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Contents
6. UE State Transition
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
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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
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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]
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CELL_FACH to CELL_PCH (Cont.)
Service Type
CELL_DCH to CELL_FACH
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:
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Parameters of UE State Transition (Cont.)
Parameter Parameter nameRecommended
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
BE service on the DCH:
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Contents
6. UE State Transition
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
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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
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Parameters of UE State Transition (Cont.) CellReSelectTimer
Parameter name: Cell Reselection Timer
Recommended value: 180, namely 180s
CellReSelectCounter
Parameter name: Cell Reselection Counter Threshold
Recommended value: 9
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Contents
6. UE State Transition
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
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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
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Contents
6. UE State Transition
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
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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
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Parameters of UE State Transition (Cont.)
BE service on the 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
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Parameters of UE State Transition (Cont.)
BE service on the HS-DSCH:
BeF2HTvmThd
Parameter name: BE F2HS-DSCH 4A Threshold
Recommended value: D1024, namely 1024bytes
BeF2HTvmTimeToTrig
Parameter name: BE F2HS-DSCH 4A Time
Recommended value: D0, namely 0ms
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Parameters of UE State Transition (Cont.)
Real-time service in the PS domain:
RtF2DHTvmThd
Parameter name: RT F2D/HSPA 4A Threshold
Recommended value: D1024, namely 1024bytes
RtF2DHTvmTimeToTrig
Parameter name: RT F2D/HSPA 4A Time
Recommended value: D0, namely 0ms
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Parameters of UE State Transition (Cont.)
BE service on the E-DCH:
BeF2ETvmThd
Parameter name: BE F2E-DCH 4A Threshold
Recommended value: D1024, namely 1024bytes
BeF2ETvmTimeToTrig
Parameter name: BE F2E-DCH 4A Time
Recommended value: D0, namely 0ms
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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
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Contents
7. Service Release Due to the Absence of Data
7.1 Always Online
7.2 Fast Dormancy
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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
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Always Online Procedure
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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:
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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
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page152
Parameters of Fast Dormancy
T323
Parameter name: Timer 323
Recommended value: INVALID
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