owo114060 wcdma ran12 dccc algorithm and parameters issue1.00

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WCDMA DCCC Algorithm and Parameters
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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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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 25.413: 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
DCCC Based on Throughput
UE State Transition
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UE State Transition
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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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The DCCC function is controlled by the subparameter DRA_DCCC_SWITCH of the parameter DraSwitch.
The UL DCCC function is invalid for the BE service whose maximum UL rate is below or equal to the UL rate threshold for DCCC specified by UlDcccRateThd. Thus, excessive signaling procedures can be avoided. The DL rate is limited in the same way. The DL rate threshold is specified by DlDcccRateThd.
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Recommended value: ON
Recommended value: 64kbit/s, 64kbit/s
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DraSwitch-DRA_DCCC_SWITCH
Content: When the switch is on, the dynamic channel reconfiguration control algorithm is used for the RNC.
Value range: OFF, ON
Set this parameter through SET UCORRMALGOSWITCH.
UlDcccRateThd/DlDcccRateThd
Content: For a BE service that has a low maximum rate, the DCCC algorithm is not obviously effective yet it increases algorithm processing. Thus, the traffic-based DCCC algorithm is applied to BE services whose maximum UL/DL rate is greater than the threshold.
Value range: D8, D16, D32, D64, D128, D144, D256, D384
Physical value range: 8, 16, 32, 64, 128, 144, 256, 384
Physical unit: kbit/s
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UE State Transition
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Rate adjustment based on traffic volume only applies to R99 BE services.
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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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The traffic volume is measured by the buffer usage of the RLC entity. The RNC increases or decreases the rate of BE services based on the traffic volume to avoid excessively high or low traffic volume.
The traffic volume measurements defined in 3GPP TS 25.331 are applicable to only the UL. For the DL, traffic volume measurements and associated rate adjustment are designed and implemented by Huawei.
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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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In the UL, the UTRAN sends to the UE the absolute threshold, time to trigger event 4a or 4b, and pending time after trigger through a MEASUREMENT CONTROL message. The UE sends a report on event 4a or 4b through a MEASUREMENT REPORT message.
In the DL, measurement control is also performed through messages. The difference is that all the interactions occur within the RNC in the DL.
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Event 4a
Event 4a triggered by an increase in the transport channel traffic volume:
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In the uplink:
When the traffic volume is higher than the value of Event4aThd for a period of time defined by TimetoTrigger4A, the UE reports an event 4a. No more events 4a are reported during the time defined by PendingTime4A.
In the downlink:
When the traffic volume is higher than the value of Event4aThd for a period of time defined by TimetoTrigger4A, the RNC reports internally an event 4a. No more events 4a are reported during the time defined by PendingTime4A.
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Event 4b
Event 4b triggered by a decrease in the transport channel traffic volume:
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In the uplink:
When the traffic volume is lower than the value of Event4bThd for a period of time defined by TimetoTrigger4B, the UE reports an event 4b. No more events 4b are reported during the time defined by PendingTime4B.
In the downlink:
When the traffic volume is lower than the value of Event4bThd for a period of time defined by TimetoTrigger4B, the RNC reports internally an event 4b. No more events 4b are reported during the time defined by PendingTime4B.
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Parameter
1024bytes
1024bytes
TimetoTrigger4A
4000ms
4000ms
Event4bThd
None
None
TimetoTrigger4B
4000ms
4000ms
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Rate adjustment based on traffic volume takes effect in the UL and DL separately. Associated parameters are configured in the UL and DL separately.
Set these parameters through ADD UTYPRABDCCCMC/MOD UTYPRABDCCCMC.
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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
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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
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.
Value range: RATE_UP_AND_DOWN_ON_DCH, RATE_UP_ONLY_ON_DCH
Set this parameter through SET UDCCC.
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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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After receiving a report on event 4a, the RNC triggers rate increase. After receiving a report on event 4b, the RNC triggers rate decrease. The minimum value to which the rate can be decreased is the UL rate threshold for DCCC (UlDcccRateThd). The maximum value to which the rate can be increased is the MBR, which is Min{ the requested maximum bit rate assigned by the CN, the maximum rate supported by UE capabilities}.
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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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UlRateUpAdjLevel
Recommended value: 3_Rates
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UlRateUpAdjLevel
Content: This parameter determines whether the UL rate is raised to the maximum rate in one step or two steps for BE service set up on DCH in uplink.
Value range: 2_Rates, 3_Rates
UlRateDnAdjLevel
Content: This parameter determines whether the UL rate is lowered to the minimum rate in one step or two steps for BE service set up on DCH in uplink.
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UlMidRateCalc
Recommended value: HAND_APPOINT
Recommended value: D128, namely 128kbit/s
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UlMidRateCalc
Content: This parameter determines whether automatic or manual mode is used for 3-step adjustment of the uplink intermediate rate.
Value range: AUTO_CALC, HAND_APPOINT
UlMidRateThd
Content: Threshold of the UL intermediate rate when the 3-step mode is used for UL rate adjustment and the manual mode is used for UL intermediate rate adjustment.
Value range: D16, D32, D64, D128, D144, D256, D384
Physical value range: 16, 32, 64, 128, 144, 256, 384
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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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After receiving a report on event 4a, the RNC triggers rate increase. After receiving a report on event 4b, the RNC triggers rate decrease. The minimum value to which the rate can be decreased is the DL rate threshold for DCCC (DlDcccRateThd). The maximum value to which the rate can be increased is the MBR, which is Min{ the requested maximum bit rate assigned by the CN, the maximum rate supported by UE capabilities}.
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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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DlRateUpAdjLevel
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DlRateUpAdjLevel
Content: This parameter determines whether the DL rate is raised to the maximum rate in one step or two steps for BE service set up on DCH in downlink.
DlRateDnAdjLevel
Content: This parameter determines whether the DL rate is lowered to the minimum rate in one step or two steps for BE service set up on DCH in downlink.
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DlMidRateCalc
Recommended value: HAND_APPOINT
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DlMidRateCalc
Content: This parameter determines whether automatic or manual mode is used for 3-step adjustment of the downlink intermediate rate.
Value range: AUTO_CALC, HAND_APPOINT
DlMidRateThd
Content: Threshold of the DL intermediate rate when the 3-step mode is used for DL rate adjustment and the manual mode is used for DL intermediate rate adjustment.
Value range: D16, D32, D64, D128, D144, D256, D384
Physical value range: 16, 32, 64, 128, 144, 256, 384
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Signaling procedure of UL rate upsizing based on traffic volume:
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Signaling procedure of UL rate downsizing based on traffic volume:
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Signaling procedure of DL rate upsizing based on traffic volume:
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Signaling procedure of DL rate downsizing based on traffic volume:
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Contents
UE State Transition
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Rate adjustment based on throughput applies to HSUPA and R99 BE services.
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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 is the traffic volume in a measurement period. The RNC adjusts the rate of BE services based on the throughput.
For HSUPA BE services, the RNC performs rate decrease or rate increase based on the throughput.
For DCH BE services, the RNC performs rate decrease only when the throughput is excessively high.
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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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For throughput-based rate adjustment 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 adjustment on the DCH, only event 4b applies, that is, only rate downsizing is applicable.
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Throughput Measurement Event (Cont.)
Mechanism of measuring the throughput and reporting events 4a and 4b:
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The throughput measurement period can be specified by the parameter E2FThrouMeasPeriod for services on the E-DCH and DchThrouMeasPeriod for services on the DCH
Assume that AvgThroughput represents the throughput of an RB during a measurement period. Then:
If the AvgThroughput is above the threshold of event 4a for a period of time specified by EdchTimetoTrigger4A and the current time is not in the pending time after trigger, then event 4a is triggered. After event 4a is triggered, it cannot be triggered any more in the period of time specified by EdchPendingTime4A.
If the AvgThroughput is below the threshold of event 4b for a period of time specified by EdchTimetoTrigger4B or DchThrouTimetoTrigger4B and the current time is not in the pending time after trigger, then event 4b is triggered. After event 4b is triggered, it cannot be triggered any more in the period of time specified by EdchPendingTime4B or DchThrouPendingTime4B.
The previous figure shows the mechanism of measuring the throughput and reporting events 4a and 4b. In this example, the time to trigger event 4a or 4b is three consecutive measurement periods, and the pending time after trigger is four consecutive measurement periods.
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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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The mechanism of reporting events 4a and 4b about throughput is as follows:
Assume that a set of adjustment rates and associated throughput thresholds is: {(R1, TR1), ... (Ri, TRi), ... (RN, TRN)}
For services on the E-DCH:
The first variable in each pair of parentheses represents the HSUPA adjustment rate specified by the EdchRateAdjustSet parameter.
The second variable in each pair of parentheses represents the throughput threshold corresponding to the adjustment rate.
TRi = Ri x (Threshold rate ratio). For different threshold rate ratios, see the following table.
RN represents the maximum adjustment rate specified by the EdchRateAdjustSet parameter.
Assume that RMaxRate represents the MBR assigned for a service through an RAB ASSIGNMENT REQUEST message. Then, TRMaxRate = RMaxRate x (Threshold rate ratio)MaxRate.
If Rt < RMaxRate ≤ Rt+1 (1 ≤ t ≤ N–1), the set of HSUPA adjustment rates and associated throughput thresholds is: {(R1, TR1), ..., (Ri, TRi), ..., (Rt, TRt), ( RMaxRate, TRMaxRate)}.
If RMaxRate > RN, the set of HSUPA adjustment rates and associated throughput thresholds is: {(R1, TR1), ..., (Ri, TRi), ..., (RN, TRN), (RMaxRate, TRMaxRate)}.
For services on the DCH, the adjustment rate set is {rate threshold for DCCC, middle rate, maximum rate}.
The rate threshold for DCCC is specified by the UlDcccRateThd or DlDcccRateThd parameter.
The middle rate is determined by the UlMidRateCalc or DlMidRateCalc parameter and the UlMidRateThd or DlMidRateThd parameter.
The maximum rate is the MBR.
The throughput threshold is as follows: Rt = Rt x 90%.
Rate
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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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Here:
Rt is the current rate in the HSUPA rate adjustment set.
Rt-1 is the latest rate in the HSUPA rate adjustment set.
Threshold rate ratiot and threshold rate ratiot-1 are defined by the table of previous page.
If the current HSUPA adjustment rate is the minimum rate, the threshold of event 4b is the threshold rate of E-DCH to FACH state transition (E2FThrouThd).
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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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Here:
Rt-1 is the latest rate in the DCH rate adjustment set.
Threshold rate ratiot-1 is set to 90%.
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Parameter name: Dynamic resource allocation switch for HSUPA DCCC function
Recommended value: ON
Recommended value: OFF
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DraSwitch-DRA_HSUPA_DCCC_SWITCH
Content: When the switch is on, the DCCC algorithm is used for HSUPA. The DCCC switch must be also on before this switch takes effect.
CfgSwitch-THROU_DCCC_SWITCH
Content: When the switch is on, the DCCC based on traffic statistics is supported over the DCH.
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Recommended value: 30, namely 300ms
DchThrouMeasPeriod
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E2FThrouMeasPeriod
Content: Period of E-DCH throughput ratio measurement. This parameter specifies the period of E-DCH throughput ratio measurement. The throughput ratio over the E-DCH is periodically measured to implement state transition from E-DCH to FACH and DCCC algorithm on EDCH.
Value range: 1~10000
Physical unit: ms
DchThrouMeasPeriod
Content: This parameter specifies the period of DCH throughput ratio measurement. Macd performs statistic of traffic volume on DCH and reports 4B events which are used for the rate decrease process of BE service set up on DCH.
Value range: 1~1000
Physical unit: ms
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Service Type
2, none
16, none
2, none
16, none
2, 2
16, 16
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For EDCH, rate adjustment based on throughput takes effect in the UL. So the associated parameters are configured in the UL only.
For DCH, rate adjustment based on throughput takes effect in the UL and DL separately. So the associated parameters are configured in the UL and DL separately.
Set these parameters through ADD UTYPRABDCCCMC/MOD UTYPRABDCCCMC.
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Recommended value:
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EdchRateAdjustSet
Content: HSUPA UL rate adjustment set. It contains rates for rate adjustment and is used in the HSUPA DCCC algorithm.
Value range: RATE_8KBPS, RATE_16KBPS, RATE_32KBPS, RATE_64KBPS, RATE_128KBPS, RATE_144KBPS, RATE_256KBPS, RATE_384KBPS, RATE_608KBPS, RATE_1440KBPS, RATE_2048KBPS, RATE_2880KBPS, RATE_5740KBPS
Physical value range: 8, 16, 32, 64, 128, 144, 256, 384, 608, 1440, 2048, 2880, 5740
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E2FThrouThd
Content: This parameter is used to check whether the UE in the low activity state. If the UE is on the E-DCH channel, the low activity counter increases by 1 every time throughput ratio event 4B is reported.
Value range: 0~384
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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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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.
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Recommended value: RATE_UP_AND_DOWN_ON_EDCH
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HsupaDcccStg
Content: Strategy of the UE for rate adjustment over the EDCH. RATE_UP_AND_DOWN_ON_EDCH indicates that the rate over the EDCH can be raised or lowered. RATE_UP_ONLY_ON_EDCH indicates that the rate over the EDCH can only be raised, which means that the UE can switch to the FACH state at any rate.
Value range: RATE_UP_AND_DOWN_ON_EDCH, RATE_UP_ONLY_ON_EDCH
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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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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
3.1 Throughput Measurement and Event Reporting
3.2 Rate Adjustment Based on Throughput
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Throughput-based rate adjustment on the DCH is implemented through the signaling on the Uu and Iub interfaces.
Only rate decrease can be implemented by this algorithm.
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Contents
UE State Transition
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Rate adjustment based on link stability only applies to R99 BE services.
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Contents
4.1 Uplink Stability Measurement and Event Reporting
4.2 Downlink Stability Measurement and Event Reporting
4.3 Rate Adjustment Based on Uplink Stability
4.4 Rate Adjustment Based on Downlink Stability
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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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Link stability is measured through the UE TX power or BLER in the UL. The RNC performs rate decrease or rate increase for R99 BE services based on the link stability.
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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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After establishing an BE service, the RNC sends the following information specified by switch setting to the UE through a MEASUREMENT CONTROL message:
Threshold of event 6A1, 6B1, 6A2, 6B2, or 6D for TX power.
Time to trigger event 6A1, 6B1, 6A2, 6B2, or 6D.
Then, the UE measures the TX power in real time, filters the measurement results.
Each time a measurement event is triggered, the UE sends a measurement event report to the UTRAN through a MEASUREMENT REPORT message. Then, the UL stability function performs corresponding control tasks according to the report.
The UL stability control switch setting:
When BeUlEvTrigInd is set to SINGLE and BeUlQos6A1McSwitch is set to YES, event 6A1 triggers UL stability control.
When BeUlEvTrigInd is set to SINGLE and BeUlQos5AMcSwitch is set to YES, event 5A triggers UL stability control.
When BeUlEvTrigInd is set to COMBINE, events 6A1 and 5A together trigger UL stability control.
When BeUlQos6DMcSwitch is set to ON, event 6D triggers UL stability control.
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Recommended value: SINGLE
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BeUlEvTrigInd
Content: For BE service, When the parameter is set to SINGLE, an UL event 6A1 or 5A can independently trigger the QOS enhancement action. The 6A1, 5A switch settings decide whether to perform 6A1 or 5A measurement control. When the parameter is set to COMBINE, only combined events 6A1+5A can trigger the QOS enhancement action, and whether to perform 6A1 and 5A measurement is not controlled by the 6A1 and 5A measurement switch.
Value range: SINGLE, COMBINE
Set this parameter through SET UQOSACT.
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BeUlQos6A1McSwitch
Recommended value: YES
Recommended value: NO
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BeUlQos6A1McSwitch
Content: Event 6A1 measurement switch when BeUlEvTrigInd is set to SINGLE for BE service. If this parameter is set to YES, event 6A1 measurement is delivered.
Value range: NO, YES
BeUlQos5AMcSwitch
Content: Event 5A measurement switch when BeUlEvTrigInd is set to SINGLE for BE service. If this parameter is set to YES, event 5A measurement is delivered.
BeUlQos6DMcSwitch
Content: UL event 6D measurement switch for BE service. If this parameter is set to YES, event 6D measurement is delivered.
Set these parameters through SET UQOSACT.
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As shown in the above figure, the maximum UL TX power for BE services is specified by the parameter MaxUlTxPowerforInt or MaxUlTxPowerforBac. Delta_6a1, Delta_6b1, Delta_6a2, and Delta_6b2 are relative thresholds, which are the differences between the absolute thresholds of events 6A1, 6B1, 6A2, and 6B2 for TX power and the maximum UL TX power of BE service. They are specified by the parameters UlThd6A1, UlThd6B1, UlThd6A2, and UlThd6B2 respectively.
The absolute thresholds are calculated according to the following formulas:
Threshold of event 6A1 for TX power = MaxUlTxPowerforInt/Bac – UlThd6A1
Threshold of event 6B1 for TX power = MaxUlTxPowerforInt/Bac – UlThd6B1
Threshold of event 6A2 for TX power = MaxUlTxPowerforInt/Bac – UlThd6A2
Threshold of event 6B2 for TX power = MaxUlTxPowerforInt/Bac – UlThd6B2
If the UE TX power is above the threshold of event 6A1 for TX power for a period of time specified by UlBeTrigTime6A1, event 6A1 is triggered.
If the UE TX power is below the threshold of event 6B1 for TX power for a period of time specified by UlBeTrigTime6B1, event 6B1 is triggered.
If the UE TX power is above the threshold of event 6A2 for TX power for a period of time specified by UlBeTrigTime6A2, event 6A2 is triggered.
If the UE TX power is below the threshold of event 6B2 for TX power for a period of time specified by UlBeTrigTime6B2, event 6B2 is triggered.
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As shown in the above figure, the maximum UL TX power for BE services is specified by the parameter MaxUlTxPowerforInt or MaxUlTxPowerforBac.
If the UE TX power is equal to the maximum UL TX power for a period of time specified by UlBeTrigTime6D, event 6D is triggered.
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MaxUlTxPowerforInt
Recommended value: 24, namely 24dBm
MaxUlTxPowerforBac
Recommended value: 24, namely 24dBm
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MaxUlTxPowerforInt
Content: The maximum UL transmit power for the interactive service in a specific cell. It is based on the UL coverage requirement of the interactive service designed by the network planning. The larger the value of this parameter is, the wider the coverage of the corresponding services will be. When the downlink coverage is exceeded, the uplink coverage and downlink coverage of the service will become unbalanced. If the values of these parameters are too small, the uplink coverage will probably be smaller than the downlink coverage of the service.
Value range: -50~33
Physical unit: dBm
MaxUlTxPowerforBac
Content: The maximum UL transmit power for background service in a specific cell. It is based on the UL coverage requirement of the background service designed by the network planning. The larger the value of this parameter is, the wider the coverage of the corresponding services will be. When the downlink coverage is exceeded, the uplink coverage and downlink coverage of the service will become unbalanced. If the values of these parameters are too small, the uplink coverage will probably be smaller than the downlink coverage of the service.
Value range: -50~33
Physical unit: dBm
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UlThd6A1/UlThd6B1/UlThd6A2/UlThd6B2
Recommended value:
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UlThd6A1/UlThd6B1/UlThd6A2/UlThd6B2
Value range: 0~82
Physical unit: dB
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UlBeTrigTime6A1/UlBeTrigTime6B1/UlBeTrigTime6A2 /UlBeTrigTime6B2/UlBeTrigTime6D
Parameter name:
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UlBeTrigTime6A1/UlBeTrigTime6B1/UlBeTrigTime6A2/UlBeTrigTime6B2/UlBeTrigTime6D
Content: Duration when the measured value of BE keeps fulfilling the 6A1/6B1/6A2/6B2/6D measurement condition before the event 6A1/6B1/6A2/6B2/6D is triggered. The trigger time is used to prevent the sudden change of the measured value for being reported. The longer the trigger time is, the greater the effect of ignoring sudden changes is. Yet the response to changes of the measured value becomes slower.
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
Physical unit: ms
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The UL BLER measurement may trigger event 5A. The RNC defines a sliding window of a certain length through the parameter StaBlkNum5A. Each time the RNC receives a data block, it compares the number of error blocks in the sliding window with the threshold of event 5A specified by the parameter Thd5A. If the number of error blocks is above or equal to the threshold of event 5A, event 5A is triggered. Then, the RNC can trigger again event 5A only after the number of received error blocks reaches HangBlockNum5A, to avoid excessive reporting of event 5A.
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StaBlkNum5A
Recommended value: None
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StaBlkNum5A
Content: When a DCH is set up, the UE starts counting the number of faulty CRCs within a specified sliding window. If the number of faulty CRCs exceeds the specified threshold, event 5A is triggered. The length of the sliding window is specified by this parameter.
Value range: 1~512
Thd5A
Content: When a DCH is set up, the UE starts counting the number of faulty CRCs within a specified sliding window. If the number of faulty CRCs exceeds this parameter, event 5A is triggered.
Value range: 1~512
HangBlockNum5A
Content: When event 5A is triggered, a pending timer is started, during which event 5A will not be reported before the specified number is reached. This parameter can control the frequency for reporting event 5A.
Value range: 1~512
Set these parameters through ADD UTYPRABQUALITYMEAS.
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Contents
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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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Link stability is measured through the TCP or RLC PDU retransmission rate in the DL. The RNC performs rate decrease or rate increase for R99 BE services based on the link stability.
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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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Here:
Maximum DL power is specified by the RlMaxDlPwr parameter, that is, the maximum DL RL TX power of DPDCHs.
Relative threshold is the relative threshold of event Ea or Eb, which is specified by the ThdEa or ThdEb parameter respectively.
PO3 is the offset from the TX power of the DPCCH pilot field to the TX power of DPDCHs.
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As shown in the previous figure:
If the TX power of the pilot field of DPCCH is above threshold 1 for a period of time specified by the DlBeTrigTimeE parameter, event Ea is triggered. Then, the NodeB periodically reports the measurement results of TX power to the RNC.
The NodeB reporting period is specified by the ChoiceRptUnitForBeE, TenMsecForBeE, or MinForBeE parameter.
If the TX power of the pilot field of DPCCH is below threshold 2 for a period of time, event Eb is triggered. For BE services, this period is set to 640 ms. Then, the NodeB stops reporting the measurement results of TX power.
Power
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RlMaxDlPwr
ThdEa/ThdEb
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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ThdEa
Content: If DL code TX power is higher than the Ea absolute threshold, event Ea is triggered. This event triggers DL QoS operation. This parameter specifies a relative threshold.
Value range: 0~56
Physical unit: dB
ThdEb
Content: If DL code TX power is lower than the Eb absolute threshold, event Eb is triggered. When this event report is received, DL QoS operation is stopped. This parameter specifies a relative threshold.
Value range: 0~56
Physical unit: dB
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DlBeTrigTimeE
ChoiceRptUnitForBeE
Recommended value: TEN_MSEC
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DlBeTrigTimeE
Content: Duration from when the BE TX power is beyond the threshold Ea to when the event Ea is triggered or from when the BE TX power is below the threshold Eb to when the event Eb is triggered. This parameter is used to avoid faulty reporting due to instability of power.
Value range: 1~6000
Physical unit: ms
ChoiceRptUnitForBeE
Content: This parameter specifies the reporting period of the event E of the BE service. The unit of the reporting period can be 10 ms or minute.
Value range: TEN_MSEC, MIN
TenMsecForBeE
Content: This parameter is valid when the corresponding parameter related to the reporting period unit for the event E of BE service is set to TEN_MSEC. The DL code TX power is reported periodically after the event Ea is reported. This parameter specifies the reporting period. If the parameter is set to A, the reporting period is A x 10 ms.
Value range: 1~6000
Physical unit: ms
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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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Here:
Pmax is the maximum DL TX power corresponding to the target rate.
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 and determined by the parameter BePwrMargin for a single service or by the parameter CombPwrMargin for combined services.
Ea relative threshold is used to avoid repeated triggering of event Ea after a rate increase.
PO3 is the offset from the TX power in the pilot field of the DPCCH to the TX power of the DPDCHs.
In RAN 12.0, the thresholds of events Fa and Fb are the same. The threshold of event F cannot be above the threshold of event Ea. Otherwise, the threshold of event F is set to the threshold of event Ea.
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As shown in the previous figure:
When the TX power of the pilot field of DPCCH is below threshold 1 for a period of time specified by the DlBeTrigTimeF parameter, event Fa is triggered. Then, the NodeB periodically reports the measurement results of TX power to the RNC.
The NodeB reporting period is specified by the ChoiceRptUnitForBeF, TenMsecForBeF, or MinForBeF parameter.
When the TX power of the pilot field of the DPCCH is above threshold 2 for 640 ms, event Fb is triggered. Then, the NodeB stops reporting the measurement results of TX power.
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Pmax
Parameter name: the maximum DL TX power corresponding to the target rate
Recommended value: refer to Power Control course
BePwrMargin/CombPwrMargin
Recommended value: 10/20, namely 1dB/2dB
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BePwrMargin
Content: The ralative power margin of single BE traffic, used to calculate the triggering threshold of event F, can avoid the fluctuation of traffic rate in case the power becomes restricted after rate is increased.
Value range: 0~100
Physical unit: dB
CombPwrMargin
Content: The ralative power margin of combined traffics, used to calculate the triggering threshold of event F, can avoid the fluctuation of traffic rate in case the power becomes restricted after rate is increased.
Value range: 0~100
Physical unit: dB
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DlBeTrigTimeF
ChoiceRptUnitForBeF
Recommended value: TEN_MSEC
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DlBeTrigTimeF
Content: Duration from when the BE TX power is below the threshold Fa to when the event Fa is triggered or from when the BE TX power is beyond the threshold Fb to when the event Fb is triggered. This parameter is used to avoid faulty reporting due to instability of power.
Value range: 1~6000
Physical unit: ms
ChoiceRptUnitForBeF
Content: This parameter specifies the reporting period of the event F of the BE service. The unit of the reporting period can be 10 ms or minute.
Value range: TEN_MSEC, MIN
TenMsecForBeF
Content: This parameter is valid when the corresponding parameter related to the reporting period unit for the event F of BE service is set to TEN_MSEC. The DL code TX power is reported periodically after the event Fa is reported. This parameter specifies the reporting period. If the parameter is set to A, the reporting period is A x 10 ms.
Value range: 1~6000
Physical unit: ms
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The DL RLC PDU retransmission rate is calculated according to the ACK or NACK feedback information.
The RLC PDU retransmission rate is reported to layer 3 from layer 2.
The procedure for measuring the RLC PDU retransmission rate is as follows:
Set up a sliding window for calculating the RLC PDU retransmission rate periodically according to the period of monitoring the retransmission rate specified by the parameter MoniterPrd.
Check whether the RLC PDU retransmission rate is above the threshold of event A specified by the parameter EventAThred. If it is above the threshold for a period of time, that is, MoniterPrd x TimeToTiggerA, event A is triggered and the RLC PDU retransmission rate is reported.
In the period of time (MoniterPrd x PendingTimeA) after event A is reported, the RLC PDU retransmission rate is not calculated any more. If a report on event Ea is already received before a report on event A is received, the system may reduce the DL rate.
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SrncBeDlRlcQosSwitch
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SrncBeDlRlcQosSwitch
Content: When the parameter is set to YES, QoS control for DL BE services is based on the TCP and RLC retransmission. When the parameter is set to NO, QoS control for DL BE services is based on the TCP. In both situations, QoS control is not performed across the Iur interface.
Set this parameter through SET UQOSACT.
MoniterPrd
Content: This parameter specifies a sampling period of retransmission ratio monitoring after the RLC entity is established or reconfigured.
Physical unit: ms
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EventAThred
TimeToTiggerA
Recommended value: 2
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EventAThred
Content: This parameter specifies the threshold of event A, that is, the upper limit of RLC retransmission ratio.
Value range: 0~1000
Physical unit: %
TimeToTiggerA
Content: This parameter specifies the number of consecutive periods during which the percentage of retransmitted PDUs is higher than the threshold of event A before event A is triggered.
Value range: 1~100
PendingTimeA
Content: This parameter specifies the number of pending periods after event A is triggered. During the pending time, no event related to retransmission ratio is reported.
Value range: 0~1000
Set these parameters through ADD UTYPRABRLC.
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The rate adjustment methods in the UL and DL are the same. The adjustment processes are performed separately.
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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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The Uplink mid bit rate threshold parameter is the same as that described in Rate Adjustment Based on Traffic Volume.
If the rate decrease level (UlRateDnAdjLevel or DlRateDnAdjLevel) is set to 2_Rates, the middle rate is calculated by the RNC.
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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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UlFullCvrRate
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UlFullCvrRate
Content: Maximum UL rate when coverage of the entire cell is ensured under certain load. For a BE service that has a low maximum rate, the DCCC algorithm is not obviously effective yet it increases algorithm processing. Thus, the coverage-based DCCC algorithm is applied to BE services whose maximum UL rate is greater than the threshold.
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Before rate increase, the RNC checks whether the current power is sufficient. If the power is sufficient, rate increase is triggered by event 4a.
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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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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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The Uplink mid bit rate threshold parameter is the same as that described in Rate Adjustment Based on Traffic Volume.
If the rate decrease level (UlRateDnAdjLevel or DlRateDnAdjLevel) is set to 2_Rates, the middle rate is calculated by the RNC.
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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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DlFullCvrRate
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DlFullCvrRate
Content: Maximum DL rate during network planning when coverage of the entire cell is ensured. When the DL TCP is limited, the current rate is reduced to the full coverage rate if the current rate is greater than the full coverage rate. For a BE service that has a low maximum rate, the DCCC algorithm is not obviously effective yet it increases algorithm processing. Thus, the DCCC algorithm is applied to BE services whose maximum DL rate is greater than the threshold.
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Before rate increase, the RNC checks whether the current power is sufficient. If the power is sufficient, rate increase is triggered by event 4a.
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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
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For detailed information about the signaling procedure of rate increase, see Signaling Procedure of Rate Adjustment Based on Traffic Volume.
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Contents
UE State Transition
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When the cell enters the basic congestion state, the RNC decreases the rate of BE services, and the maximum target rate is the GBR for a BE RAB. When the cell exits from the basic congestion state, the LDR function does not perform any task on the UEs in the cell. The system decreases or increases service rates through the DCCC function.
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Contents
5.1 Rate Adjustment Based on Uplink Congestion
5.2 Rate Adjustment Based on Downlink Congestion
5.3 Rate Increase Failure and Penalty
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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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The UL mid bit rate threshold parameter is the same as that described in Rate Adjustment Based on Traffic Volume.
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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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The HSUPA UL rate adjustment set is the same as that described in Rate Adjustment Based on Throughput.
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The previous figure shows an example of UL BE rate decrease and increase in the case that the RAB is a DCH RAB.
In this example, a rate decrease is triggered by UL basic congestion, and a rate increase is triggered when basic congestion is relieved. In addition, the current UL rate can be the initial rate, middle rate, or MBR.
When the current UL rate is the MBR, it is decreased to the middle rate if a UL basic congestion report is received, and then decreased to the GBR if a second UL basic congestion report is received.
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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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The DL mid bit rate threshold parameter is the same as that described in Rate Adjustment Based on Traffic Volume.
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The previous figure shows an example of DL BE rate decrease and increase in the case that the RAB is a DCH RAB.
In this example, a rate decrease is triggered by DL basic congestion, and a rate increase is triggered when basic congestion is relieved. In addition, the current DL rate can be the initial rate, middle rate, or MBR.
When the current DL rate is the MBR, it is decreased to the middle rate if a DL basic congestion report is received, and then decreased to the GBR if a second DL basic congestion report is received.
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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 penalty in the case of 2_Rates adjustment:
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The symbols in the previous figure are described as follows:
1-8: indicating that event 4a is reported from the UE
S1: indicating that the cell is in the normal state
S2: indicating that the cell is in the congestion state
S3: indicating that the cell is restored from the congestion state
The procedure for penalizing rate increase failures is as follows:
After the first rate increase fails, the timer for detecting DCCC rate increase failures is started. The timer length is specified by the parameter MoniTimeLen. Each time the rate increase fails, the rate increase failure counter is incremented by one.
The rate increase failure counter determines whether to start the timer for penalizing DCCC rate increase failures:
Before the timer for detecting DCCC rate increase failures expires, the penalty timer (DcccUpPenaltyLen) is started if the number of such failures is above or equal to the corresponding threshold (FailTimeTh). No rate increase attempt is allowed before the penalty timer expires.
When the timer for detecting DCCC rate increase failures expires, the rate increase failure counter returns to 0 and the system returns to step 1 if the number of rate increase failures is below the corresponding threshold.
Rate increase attempts are allowed after the penalty timer expires. If a rate increase attempt is repeated when the cell is in the congestion state, the system returns to step 1.
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Recommended value: 60, namely 60s
FailTimeTh
Recommended value: 30, namely 30s
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MoniTimeLen
Content: Length of the period within which the times of consecutive failure to increase the rate of a BE service is monitored. Increase of the BE service rate is triggered by 4A measurement reports. IF the times exceeds the DCCC Rate Up Fail Time Threshold, the DCCC Rate Up Fail Penalty Timer will be started, and 4A report will not be processed until DCCC Rate Up Fail Penalty Timer expires.
Physical unit: s
FailTimeTh
Content: This parameter specifies the threshold of allowed times of rate increase consecutive failure within a certain monitoring period. Increase of the BE service rate is triggered by the report on 4A measurement that is performed in the UL and the DL separately. If the times of failure is beyond this threshold, subsequent rate increase is not allowed even if the 4A measurement report is received.
Value range: 1~255
DcccUpPenaltyLen
Content: Length of the penalty period within which the rate of a BE service cannot be increased even if the 4A measurement report is received. Increase of the BE service rate is triggered by the 4A measurement report. 4A report will not be processed until this Penalty Timer expires.
Physical unit: s
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Signaling procedure of rate decrease based on UL/DL basic congestion:
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For detailed information about the signaling procedure of rate increase, see Signaling Procedure of Rate Adjustment Based on Traffic Volume.
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Contents
UE State Transition
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The RNC checks the service activity of the UE and performs state transition for the UE in connected mode. The states of the UE in connected mode are CELL_DCH, CELL_FACH, CELL_PCH, and URA_PCH.
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Contents
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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The above figure shows the transitions between the UTRAN RRC mode and the GSM connected mode for CS services and transitions between the UTRAN RRC mode and the GSM/GPRS packet transfer mode for PS services. This figure also shows the state transitions between the idle mode and the UTRAN RRC mode and the state transitions in UTRAN RRC mode. Only the state transitions within the UTRAN connected mode is described herein.
The principles of the UE state transition function are as follows:
If the activity of the UE decreases, 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 the UE increases, the state of the UE transits from CELL_PCH/URA_PCH to CELL_FACH or from CELL_FACH to CELL_DCH.
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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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In the case that the previous switches are set to ON:
If DRA_DCCC_SWITCH is set to ON and the dynamic channel adjustment strategy (DcccStg) is set to RATE_UP_AND_DOWN_ON_DCH, the UE state transition function starts to work when the UL/DL rate is below or equal to the UL/DL rate threshold for DCCC (UlDcccRateThd or DlDcccRateThd).
If DRA_DCCC_SWITCH is set to ON and DcccStg is set to RATE_UP_ONLY_ON_DCH, the UE state transition function always works.
If DRA_DCCC_SWITCH is set to OFF, the UE state transition function always works.
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Recommended values of UE state transition switches:
Parameter
ON
OFF
OFF
OFF
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DRA_PS_BE_STATE_TRANS_SWITCH
Content: When the switch is on, UE RRC status transition (CELL_FACH/CELL_PCH/URA_PCH) is allowed at the RNC.
Content: When the switch is on, the status of the UE RRC that carrying real-time services can be changed to CELL_FACH at the RNC.
Content: When the switch is on, the status of the UE RRC that carrying HSDPA services can be changed to CELL_FACH at the RNC. If a PS BE service is carried over the HS-DSCH, the switch PS_BE_STATE_TRANS_SWITCH should be ON simultaneously. If a PS real-time service is carried over the HS-DSCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be ON simultaneously.
Content: When the switch is on, the status of the UE RRC that carrying HSUPA services can be changed to CELL_FACH at the RNC. If a PS BE service is carried over the E-DCH, the switch PS_BE_STATE_TRANS_SWITCH should be ON simultaneously. If a PS real-time service is carried over the E-DCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be ON simultaneously.
Set these parameters through SET UCORRMALGOSWITCH.
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Contents
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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Course Name
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Course Name
Course Name
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When receiving a report on event 4b, the RNC starts the timer for transition from CELL_DCH to CELL_FACH and the counters for UL and DL event 4b reports. If both the number of UL event 4b reports and the number of DL event 4b reports are above or equal to the CELL_DCH to CELL_FACH transition threshold before the timer expires, the state of the UE transits from CELL_DCH to CELL_FACH when the timer expires.
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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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Here:
The CELL_DCH to CELL_FACH transition time, time to trigger, and pending time after trigger are specified by the table of next page.
The state transition traffic redundancy coefficient is used to prevent false detection that a UE is in a low-activity state, due to the loss of measurement reports. This coefficient is set to 80%.
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Service Type
Threshold of Event 4b
BeD2FStateTransTimer
D2F2PTvmThd
D2FTvmTimeToTrig
D2FTvmPTAT
BeH2FStateTransTimer
BeH2FTvmThd
BeH2FTvmTimeToTrig
BeH2FTvmPTAT
RtDH2FStateTransTimer
RtDH2FTvmThd
RtDH2FTvmTimeToTrig
tDH2FTvmPTAT
BeE2FStateTransTimer
E2FThrouThd
N-*
The parameters of event 4b are set to their respective parameter values for the UL and the DL. The parameters include the time to trigger, pending time after trigger, and threshold. For example, for BE services if the UL channel is the DCH and the DL channel is the HS-DSCH, the parameter configurations for BE service on the DCH as listed in the previous table are used for the UL, and the parameter configurations for BE service on the HS-DSCH as listed in the previous table are used for the DL.
State transition from E-DCH to FACH is similar to state transition from DCH to FACH. The difference is that the event 4b measurement for state transition from E-DCH to FACH is based on the throughput. The throughput measurement period is specified by E2FThrouMeasPeriod. The threshold of event 4b is also based on the throughput. The threshold is specified by E2FThrouThd.
For BE services on the DCH, if DRA_PS_BE_STATE_TRANS_SWITCH is set to OFF or the UE has other services that do not allow UE state transition, UE state transition cannot be performed. In this case, if both the number of UL event 4b reports and the number of DL event 4b reports are above or equal to the CELL_DCH to CELL_FACH transition threshold before the transition timer expires, the rate can be adjusted to the low-activity rate threshold (LittleRateThd).
If LittleRateThd is above or equal to UlDcccRateThd or DlDcccRateThd, the rate cannot be adjusted to LittleRateThd.
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BE service on the DCH:
Parameter
5s
D2F2PTvmThd
64bytes
D2FTvmTimeToTrig
1000ms
N-*
BeD2FStateTransTimer
Content: Timer for state transition from DCH to FACH of BE services, used to check whether the UE in the CELL_DCH state with non-real-time services is in the stable low activity state. If the value of this parameter is too low, whether the UE is in the stable low activity state cannot be determined. If the value of this parameter is too high, the dedicated channel resources are wasted. This parameter should be set on the basis of the BE service model.
Set this parameter through SET UUESTATETRANSTIMER.
D2F2PTvmThd
Content: This parameter is used to check whether the UE in the low activity state. If the UE is on DCH channel, the low activity counter increases by 1 every time traffic volume event 4B is reported. If the UE is on FACH channel, the low activity counter increases by 1 if the traffic volume is 0 in the traffic volume event 4B report.
Set this parameter through SET UUESTATETRANS.
D2FTvmTimeToTrig
Content: When the traffic volume is below the 4B threshold and remains so for the period specified by this parameter, the event 4B is reported. This parameter prevents unnecessary traffic volume events that are caused by traffic volume instability from being triggered.
D2FTvmPTAT
Content: Pending time after the traffic volume event 4B is reported. This parameter is used to prevent too many traffic volume events 4B being reported.
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BE service on the HS-DSCH:
Parameter
5s
BeH2FTvmThd
1000ms
N-*
BeH2FStateTransTimer
Content: Timer for state transition from HS-DSCH to FACH of BE services, used to check whether the UE in the CELL_DCH (with HS-DSCH) state with BE services is in the stable low activity state. If the value of this parameter is too low, whether the UE is in the stable low activity state cannot be determined. If the value of this parameter is too high, the dedicated channel resources are wasted. This parameter should be set on the basis of the BE service model.
Set this parameter through SET UUESTATETRANSTIMER.
BeH2FTvmThd
Content: This parameter is used to check whether the UE in the low activity state. If the UE is on HS-DSCH channel, the low activity counter increases by 1 every time traffic volume event 4B is reported.
BeH2FTvmTimeToTrig
Content: When the traffic volume is below the 4B threshold and remains so for the period specified by this parameter, the event 4B is reported. This parameter prevents unnecessary traffic volume events that are caused by traffic volume instability from being triggered.
BeH2FTvmPTAT
Content: Pending time after the traffic volume event 4B is reported. This parameter is used to prevent too many traffic volume events 4B being reported.
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Parameter
180s
RtDH2FTvmThd
16000ms
N-*
RtDH2FStateTransTimer
Content: Timer for state transition from DCH or HSDPA to FACH of real-time services, used to check whether the UE in the CELL_DCH state with real-time services is in the stable low activity state. If the value of this parameter is too low, whether the UE is in the stable low activity state cannot be determined. If the value of this parameter is too high, the dedicated channel

owo114060 wcdma ran12 dccc algorithm and parameters issue1.00

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