Huawei DCCC Algorithm and Parameters Introductionwww.huawei.com Node B Products of Huawei Apr. 2006 HUAWEI TECHNOLOGIES CO., LTD. 1 • • DCCC: dynamic channel configuration control DCCC, as one the most important RAN feature, will allocate dynamic resource according to the service request Meanwhile, DCCC is an effective method to increase the radio resource utilization efficiency. • HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 2 2 • Upon completion of this course. Ltd. you will be able to: • Know the categories of DCCC • Know the meaning of the corresponding parameters HUAWEI TECHNOLOGIES Co. HUAWEI Confidential Page 3 3 .. the downlink rate up/down-switch will need the Downlink Quality as a trigger qualification. Except the TVM. The channel transition is triggered by UE’s Traffic Volume Measurement (TVM). the UE can increase or decrease the rate of services. the Iub and Iur resource is limited. and will have different trigger for uplink and downlink. Thus through the dynamic allocation of channel resource. if the resource can be allocated by the actual traffic volume. the code resource can be saved and the UE battery consumption can decreased. The Rate Switch action include uplink and downlink direction.Dynamic Channel Configuration Control Action Downlink Upsizing Downlink Downsizing Rate Re-allocation Uplink Upsizing UE activity (TVM) Uplink Downsizing Trigger UE activity (TVM) Downlink Quality CELL-DCH to/from CELL-FACH UE activity (TVM) UE State Transition CELL-FACH to/from CELL-PCH CELL-PCH to/from URA-PCH • • • Optimize available resources for Best Effort Service Allocation resources dynamically to increase resource utilisation Prevent from call drop for users with high data rate service on the cell boarder HUAWEI TECHNOLOGIES Co. HUAWEI Confidential Page 4 Dynamic Channel Configuration Control (DCCC) includes two parts: UE State Transition and Rate Re-allocation. Through the Rate Re-allocation. Ltd. and more UE call can be admitted.. to improve the utilization of the resource. Through the UE State Transition. Because the OVSF code is limited. the UE state can transmit from CELL_DCH to CELL_FACH and from CELL_FACH to CELL_PCH/URA_PCH.DCCC . In the CELL_FACH or PCH/URA_PCH state. the channel code using rate can be enhanced. the system resources can be optimized. 4 . HUAWEI Confidential The Traffic Volume Measurement algorithm will measure the UE’s traffic volume. during the Pending Time [Pending Time after trigger 4A (4000ms)].Class TVM 4B THRESHOLD Threshold Time Event 4b Event 4b Timer to Trigger TVM: The monitored traffic volume corresponds to the amount of data in number of bytes that is available for transmission and retransmission in RLC layer. for uplink it is performed in UE. and for downlink it is performed in RNC MAC-D. or if the traffic volume becomes smaller than a lower threshold. it will start a timer. The the 4a/4b event will cause Rate Switching or Channel Transition. then it will start another timer. Time in milliseconds Page 5 Transport channel traffic volume Taffic Volume > Tho TVM 4A THRESHOLD Threshold Time Event 4a Event 4a Pending time after triggered HUAWEI TECHNOLOGIES Co. the 4a event will be reported again. The triggering procedure of 4b event is similar to that of 4a event. then after the Pending Time. it will trigger the event 4a.Buffer Occupancy. it will restart the first timer. Then UE reports the event 4a and event 4b by sending the MEASUREMENT REPORT message. a 4a event will be reported. if the traffic volume becomes greater than a upper threshold. When the traffic volume becomes greater than the 4a Threshold [Traffic Measurement Event 4A Threshold (1024 byte)].(TVM) Traffic Volume Measurement Transport channel traffic volume RAB&SRBClass Taffic Volume < Tho TYPRABDCCCMC. and the parameter Pending Time after trigger is set to avoid too many channel reconfiguration operations. it will trigger the event 4b. 5 . The Absolute Threshold. Time to Trigger and Pending Time after trigger parameters of event 4a and 4b are sent by UTRAN by the MEASUREMENT CONTROL command. There are three important parameters for the event judgment: 4a/4b Threshold. [Traffic Measurement Event 4B Threshold (128 byte)] [Time to trigger 4A (2560ms)] [Pending Time after trigger 4A (4000ms)] Thus the parameter Time to trigger is set to avoid needless reports triggered by traffic fluctuation. Time to Trigger and Pending Time (short for Pending Time after trigger). event 4a is not reported again even the requirements are still met. Timer to Trigger: Indicates the period of time during which the event condition has to be satisfied. Ltd. if the traffic volume still keeps above this threshold within the Time to Trigger.. if the traffic volume keeps above this threshold within the Time to Trigger [Time to trigger 4A (240ms)]. before sending a Measurement Report Pending Time after trigger: Indicates the period of time during which it is forbidden to send any new measurement reports with the same Traffic volume event identity even if the triggering condition is fulfilled.DCCC . The TVM in uplink and downlink are separate. if the current rate is [Uplink Rate adjust level]. the data rate will be downsized or upsized between [Uplink/Downlink bitrate threshold for DCCC] and the Highest Rate directly. HUAWEI Confidential Page 6 For UL Rate Switching. Upsizing is performed if RNC receives uplink traffic volume event report 4a.Class The highest rate SET DCCC Maximum bit rate Uplink mid bitrate threshold Adjust level =3 Allocated rate Uplink bit rate threshold for DCCC --. the maximum rate supported by UE capabilities} [Uplink bitrate threshold for DCCC (64kbit/s)] 6 . If the [Uplink Rate adjust level] is set to 2_Rates. then will be upsized again to the Highest Rate. firstly the rate will be downsized to the [Uplink mid bitrate threshold]. then will be downsized again to [Uplink bitrate threshold for DCCC]. Whereas. According to the parameter [Uplink Rate adjust level (2_Rates)].2 or 3 Event 4b Event 4b Event 4a Event 4a Traffic Volume Report from UE. firstly the rate will be upsized to the [Uplink mid bitrate threshold]. and the principle of strategy is: Downsizing is performed if RNC receives uplink traffic volume event report 4b.Event 4a: Traffic volume is above a threshold for a configurable time -> High active .8kbps to 384kbps Uplink mid bite rate calculate method Adjust level =2 Uplink bitrate threshold for DCCC --.DCCC . the Highest Rate = min {the request maximum bit rate assigned by CN.. Event 4a and Event 4b UE activity . it is based on the UE activity (TVM). Ltd. If the [Uplink Rate adjust level] is set to 3_Rates. and the current rate is the Highest Rate. Here. the uplink configurable bandwidth is divided into 2_Rates and 3_Rates two types.Event 4b: Traffic volumes is below a threshold for a configurable time ->Low active HUAWEI TECHNOLOGIES Co.Rating Re-allocation Rate Re-allocation – Uplink Rate GlobalParaClass Uplink Downsizing Uplink Upsizing DCCC.valid if adjust level is 3 Uplink mid bitrate threshold Time Uplink Rate adjust level --. and it’s similar with uplink. downsizing will be performed. it is based on the UE activity (TVM) or Downlink Quality. That means. when the first downlink 4B measurement report is received.8kbps to 384kbps Downlink mid bite rate calculate method --.DCCC . the counter will be increased by 1 every time a 4B report is received. and the Rate Switching principle of strategy based on TVM is: Downsizing is performed if the 4B counter of downlink traffic volume event 4b report equals or exceeds a threshold during a certain time [4B measurement report monitor time (30s)]. HUAWEI Confidential Page 7 For DL Rate Switching. If the counter equals or exceeds the calculated threshold before the monitor timer expires. Highest Rate = min {the request maximum bit rate assigned by CN. Ltd.075 ≈ 7 ) Upsizing is performed if downlink traffic volume event 4a is triggered. the downlink configurable bandwidth is divided into 2_Rates and 3_Rates two types.2 or 3 4BMONITIME 4BMONITIME Downlink rate down-switch Downlink rate up-switch Traffic Volume Report.Rating Switching GlobalParaClass Rate Re-allocation – Downlink triggered by UE activity DCCC.Class SET DCCC Maximum bit rate Downlink Bit rate threshold for DCCC Adjust level =3 Allocated rate --.Class Rate The highest rate CellClass CELLDCCC. Also according to the parameter [Downlink Rate adjust level]. Event 4a and Event 4b in RNC . Before the timer expires.valid if adjust level is 3 DOWNLINK MID BITRATE Downlink mid bitrate threshold Downlink bitrate threshold for DCCC THRESHOLD Time Adjust level =2 Event 4b Event 4b Event 4a Event 4a Downlink Rate adjust level --.Event 4b: Traffic volumes is below a threshold for a configurable time-> Low active HUAWEI TECHNOLOGIES Co. the monitor timer [4B measurement report monitor time] will be started and the 4B counter will be set to 1 at the same time. the maximum rate supported by UE capabilities} [Downlink bitrate threshold for DCCC (64kbit/s)] 7 .. the threshold is calculated by the formula: [4B measurement report monitor time / (Timer to trigger + Pending timer after Trigger)] (30s/(240ms+4000ms) =7. Here.Event 4a: Traffic volume is above a threshold for a configurable time -> High active . then will be downsized again to [Downlink BE Guarantee Bitrate (64kbit/s)].Event A : RLC retransmission value is above threshold for a period HUAWEI TECHNOLOGIES Co. 8 . the rate will be downsized to the [Downlink mid bitrate threshold]. Which means If the current rate is the Highest Rate. and not standard event defined by 3GPP). the occasion when the bandwidth is allowed to be decreased must satisfy the following requirements: 1. As above.Class Event A threshold Transmit power and RLC retransmission report: Event E/F and Event A . Ltd. the adjusting levels are 3. RLC retransmission rate exceeds retransmission threshold (Event A) When downsizing is performed.8kbps to 384kbps Event Ea relative threshold Event Eb relative threshold Downlink BE threshold rate Downlink bitrateguarantee bitfor DCCC Time ADD TYPRABRLC Event A time to trigger Event A pending time after trigger UE with high speed service is subject to drop due to high TCP Event Ea and Event A RAB&SRBClass Event Ea and Event A TYPRABRLC.Event Fa: Transmit power falls below measurement threshold 1 .Rating Switching GlobalParaClass Rate Re-allocation – Downlink triggered by Downlink Quality Rate DCCC. report . its value is equal to the RB rate closest to the highest rate divided by two. If the level of the traffic volume adjustment algorithm is 2..Event Ea: Transmit power rises above measurement threshold 1 and Node B send TCP meas. Report . HUAWEI Confidential Page 8 Rate Downsizing principle of strategy based on Downlink Quality is: Downsizing is performed if RNC receives downlink transmit power event report Ea and RLC retransmission event report A (optional.Event Eb: transmit power falls below measurement threshold 2 and Node B stop sending TCP meas.Event Fb: Transmit power rises above measurement threshold 2 . The bit rate is calculated in the RNC.DCCC . The transmit power of downlink channel exceeds Ea event threshold (Event Ea) 2.Class SET DCCC Downlink BE guarantee bit rate Downlink rate down-switch The highest rate Allocated rate Downlink mid bitrate threshold --. Downlink mid bitrate threshold is the middle bit rate threshold for adjustment of traffic volume in downlink. Rating Switching Rate Re-allocation – Mechanism for reporting event E Measured entity T1 = Measurement Hysteresis Time Measurement T1 T1 T1 Threshold 1 Measurement Threshold 2 Report A Periodic Reports Report B Measurement Reports Report A Periodic Reports Time Transmit power and RLC retransmission report: Event E/F and Event A . When the transmit power of the pilot fields of the DPCCH stays below the measurement threshold 2 for a period longer than T1 [Event E hysteresis time].Event Fb: Transmit power rises above measurement threshold 2 . The NodeB periodically reports [Reporting period unit for event E (10ms) and Event E reporting period (480*10=4800ms)] the measurement results of the transmit power to the RNC. Fn-1 is the old filtered measurement result. Fn is the updated filtered measurement result. maximum DL power is configured by RLMAXDLPWR which aims at the DPDCHs. Mn is the latest received measurement result from physical layer measurements. Report ..Event Ea: Transmit power rises above measurement threshold 1 and Node B send TCP meas.Event Fa: Transmit power falls below measurement threshold 1 . [DL code TX power meas filter coef (1)] will be used. When RNC receives the Ea report.DCCC . The DL code TX power meas filter coef indicates how filtering of the measurement values shall be performed. Before Event E measurement event evaluation and reporting. The NodeB stops reporting the measurement results of the transmit power. a=(1/2)(k/2).a) * Fn-1 + a * Mn Here. there are different Ea and Eb thresholds. When the transmit power of the pilot fields of the DPCCH stays below stays above the measurement threshold 1 for a period longer than T1 [Event E hysteresis time (64*10=640ms)]. the event Eb is triggered. the event Ea is triggered. HUAWEI Confidential Page 9 For different services. report . and absolute Ea and Eb thresholds are calculated by the following formula: Absolute threshold= maximum DL Power － comparative threshold ＋ PO3 Where: PO3 is the relative transmit power offset between pilot fields of the DPCCH and DPDCHs. For sake of the simplicity of parameters. we configure a set of comparative thresholds for all BE services [Event Ea relative threshold (2dB) and Event Eb relative threshold (2dB)]. Ltd. the downlink bandwidth is allowed to be downsized.Event Eb: transmit power falls below measurement threshold 2 and Node B stop sending TCP meas. where k is the parameter received in the DL code TX power meas filter coef. 9 . Fn= (1 . The averaging shall be performed according to the following formula.Event A : RLC retransmission value is above threshold for a period HUAWEI TECHNOLOGIES Co. Ltd.Event A : RLC retransmission value is above threshold for a period HUAWEI TECHNOLOGIES Co. Report . The difference Power between current rate and target rate is calculated by program through the parameters acquired by simulation and field test results.Event Eb: transmit power falls below measurement threshold 2 and Node B stop sending TCP meas. Event Ea relative threshold (2dB) is used to protect triggering Event report Ea after upsizing. DL code TX power meas filter coef will be used.Rating Switching Rate Re-allocation – Mechanism for reporting event F Measured entity T1 = Measurement Hysteresis Time Measurement T1 T1 T1 Threshold 2 Measurement Threshold 1 Time Report A Periodic Reports Measurement Reports Report B Report A Periodic Report Transmit power and RLC retransmission report: Event E/F and Event A . Then the NodeB periodically report (Reporting period unit for event F (10ms) and Event F reporting period (480*10 = 4800ms)) the measurement results of the transmit power to the RNC.Event Fa: Transmit power falls below measurement threshold 1 . PO3 is the relative transmit power offset between pilot fields of the DPCCH and DPDCHs.DCCC . we strongly don’t suggest doing any change about that. HUAWEI Confidential Page 10 For different current rate and the upsizing target rate which is triggered by event 4a report..Event Ea: Transmit power rises above measurement threshold 1 and Node B send TCP meas. Event F reporting power margin (10*0. When RNC receives the Fa report. the downlink bandwidth is allowed to be upsized. report . measurement threshold 1 equals the measurement threshold 2 in program and the threshold is calculated by the following formula: Absolute threshold= maximum DL Power of target rate – difference Power between current rate and target rate – Event F reporting power margin – Event Ea relative threshold + PO3 The maximum DL Power of target rate is the maximum configured power of the target rate. Before Event F measurement event evaluation and reporting.Event Fb: Transmit power rises above measurement threshold 2 . For the sake of the simplicity. 10 . the measurement threshold is different.1 = 1dB) is the power margin of event F report. When the transmit power of the pilot fields of the DPCCH stays below the measurement threshold 1 for a period longer than T1 (Event F hysteresis time (64*10 = 640ms) ) . the event Fa is triggered. through these parameters can be changed by LMT commands. 11 . RLC retransmission needs suspending for a period of time (re-TX monitor period (1000ms) × Event A pending time after trigger (1) = 1000ms) in which time RLC retransmission is not calculated.Event Eb: transmit power falls below measurement threshold 2 and Node B stop sending TCP meas.Event Fa: Transmit power falls below measurement threshold 1 . then filter the retransmission value by re-TX measure filter coef (1).Event Fb: Transmit power rises above measurement threshold 2 .DCCC . not standard event defined by 3GPP) is triggered and the RLC retransmission value is reported. set up a statistic window according to re-TX monitor period (1000ms).. Each time Retransmission event A is triggered. the downlink bandwidth is allowed to be downsized when transmission power of NodeB is above threshold of event Ea.Event A : RLC retransmission value is above threshold for a period HUAWEI TECHNOLOGIES Co.1%=16%). Ltd. Report . which means some operations maybe happen. HUAWEI Confidential Page 11 First. and judge whether the RLC retransmission value is above the Event A threshold (160*0. When RLC retransmission rate Event report A is received.Event Ea: Transmit power rises above measurement threshold 1 and Node B send TCP meas.Rating Switching Rate Re-allocation – Mechanism for reporting event A Transmit power and RLC retransmission report: Event E/F and Event A . by which RLC retransmission is calculated. which is the filter coefficient like the DL code TX power meas filter coef. RLC retransmission Event A (This report is defined by ourselves. report . if it is above the threshold for a period of time (re-TX monitor period (1000ms) * Event A time to trigger (2) = 2000ms). 2. the number of the Cell Update messages may exceed the threshold [Cell reselection counter (9)]. it starts a timer. and the traffic volume of event report 4b is zero. 5. When the timer expires. the threshold is calculated by the formula: [FACH to PCH Transition Timer / (FACH to PCH 4B time to trigger + FACH to PCH 4B Pending Time after trigger)* State trans traff redund coef ] 180s/(5000ms+16000ms)*80% = 6. The BE HS-DSCH to FACH transition timer is used when the service type is BE and allocated channel type is HS-DSCH. In that case. The Realtime Traff DCH or HS-DSCH to FACH transition timer is used when the service type is PS RT The threshold is calculated by the formula: The threshold is calculated by the formula: [4B measurement report monitor time / (Timer to trigger + Pending timer after Trigger)* State trans traff redund coef (80%)] For DCH to FACH. The UE state transition from CELL_FACH to CELL_DCH The state of the UE transits to CELL_DCH when the URTAN receives the UL or DL the traffic volume exceeds a threshold [BE FACH to DCH 4A threshold (1024byte) or BE FACH to HS-DSCH 4A threshold (1024byte) or Realtime Traff FACH to DCH 4A threshold (1024byte)]. The UE state transition from CELL_DCH to CELL_FACH When the RNC receives the report event 4b about the decrease of the UE activity. it starts a timer. The DCH to FACH transition timer is used when the service type is BE and allocated channel type is DCH. If both uplink and downlink Counter of traffic volume event 4b equal or exceed a threshold before a timer expires. * Here. and the traffic volume of event report 4b is zero. * Here. [FACH to PCH transition timer (180s)]. all time to trigger (240ms) 12 .1.85 ≈ 6 The UE state transition from CELL_FACH to CELL_PCH When the RNC receives the report event 4b about the decrease of the UE activity. The UE state transition from CELL_PCH or URA_PCH to CELL_FACH The state of the UE transits to CELL_FACH when the UE initiates the cell update process or when the UE is paged by UTRAN and the UE needs to exchange messages with the network side. the UE sends the Cell Update messages. If both uplink and downlink Counter of traffic volume event 4b equal or exceed a threshold before a timer expires. then when the timer expires. 4.85 ≈ 6 • The UE state transition from CELL_PCH to URA_PCH When UE is in CELL_PCH state. then when the timer expires. when the UE sends the CELL UPDATE message again. during the cell reselection. the UE state transits from CELL_FACH to CELL_PCH. [The timer can be DCH to FACH transition timer (180s) or BE HS-DSCH to FACH transition timer (180s) or Realtime Traff DCH or HS-DSCH to FACH transition timer (180s)]. the UE state transits from CELL_FACH to CELL_PCH. The RNC starts a timer [CELL reselection timer (180s)] and counts the number of the Cell Update messages. the RNC initiates the state transition CELL_PCH to URA_PCH. 180s/(5000ms+16000ms)*80% = 6. Class RAB&SRBClass TYPRABDCCCMC. Traffic Measurement Event 4B Threshold: Lower limit of traffic volume for triggering the event 4B. The lower figure shows the parameters structure of the RAB&SRB Class. The smaller the parameter is. it consists of Typical RAB Basic Class. Pending Event A pending time after trigger This upper figure shows the parameters structure of DCCC parameters in RNC. Ltd. it consists of UE State-Transition Class and DCCC Class parameters. 13 . and it includes parameters: Direction: Configuring the Traffic Volume Measurement (TVM) direction to uplink or downlink. the smaller the possibility of triggering event 4B is..Class TYPRABBASIC. for the Typical RAB DCCC Measurement Control Class.Class Direction Traffic Measurement Event 4B threshold Traffic Measurement Event 4A threshold Time to trigger 4B Time to trigger 4A Pending time after trigger 4B 4B measurement report monitor time re-TX monitor period re-TX measure filter coef Event A threshold Event A time to trigger Page 13 HUAWEI TECHNOLOGIEStime after trigger 4A HUAWEI Confidential Co.Class TYPRABRLC.Class TYPRABBASIC. Next each sub-class parameters will be explained in detail.Class DCCC. the RAB&SRB Class. the smaller the possibility of triggering event 4A is. Typical RAB DCCC MC Class and Typical RAB RLC Class parameters. In Cell Class.Parameters Structure RNC RadioClass GlobalParaClass RAB&SRBClass CellClass UESTATETRANS. The larger the parameter is. Traffic Measurement Event 4A Threshold: Upper limit of traffic volume for triggering the event 4A. the LMT command is ADD/MOD/RMV TYPRABDCCCMC (according to LMT BS6800V100R007).Class TYPRABDCCCMC. Firstly.DCCC .Class CELLDCCC. In RAB&SRB Class. In Global Parameter Class. and the Cell Class. The Radio Class parameters consists of three classes: the Global Parameter Class.Class TYPRABRLC. it includes Cell DCCC Class parameters. and the harder the event 4B is triggered. Event A time to trigger: Times of period to trigger event A. for the Typical RAB Basic Class. the longer the required time to exceed the upper threshold is. Secondary. Time to trigger 4B: Time period during which the traffic volume is below the lower limit before the event 4B is triggered. The larger the parameter is. If DL 4B measurement reports are received successively. 14 . which indicates a high ratio of PDUs are retransmitted. This parameter is set to avoid needless reports triggered by traffic fluctuation. This parameter is used to avoid too many channel reconfiguration operations. and the harder the event 4A is triggered. Pending time after trigger 4A: Time period during which the event 4A is not reported after an event 4A is triggered. and it includes parameter: 4B measurement report monitor time: This parameter defines the time in which the DL 4B traffic volume measurement reports are monitored. the LMT command is ADD/MOD/RMV TYPRABRLC. Time of a period for re-transmitted PDU monitor when the RLC entity is established or reconfigured. RNC will reduce the DL bandwidth. and the smaller the possibility of triggering event 4B is. Thirdly. The larger the value of this parameter. the LMT command is MOD/RMV TYPRAB. Pending time after trigger 4B: Time period during which the event 4B is not reported after an event 4B is triggered.Time to trigger 4A: Time period during which the traffic volume is above the upper limit before the event 4A is triggered. the longer the pending time. The larger the value of this parameter. the longer the required time to be under the lower threshold is. Re-TX measure filter coef: Re-TX measure filter coefficient. no event of re-transmitted PDUs is reported. for the Typical RAB RLC Class. the longer the pending time. Event A threshold: Threshold of event A. and the smaller the possibility of triggering event 4A is. This parameter is set to avoid needless reports triggered by traffic fluctuation. This parameter is set to avoid too many channel reconfiguration operations. and it includes parameters: Re-TX monitor period: A period for re-transmitted PUD monitor. Event A is triggered only when the ratio of re-transmitted PDUs is higher than the threshold of event A in several times of period. Event A pending time after trigger: Pending times of period after event A is triggered. During the period. The larger the parameter is. RLC retransmission measurement filter coefficient. for the UE State Transition Class. BE FACH to HS-DSCH 4A threshold: Upper threshold of traffic volume triggering event 4a. the LMT command is ADD/MOD/RMV TYPRABDCCCMC. DCH to FACH transition timer: This parameter is used to detect whether a UE is stable in low activity. that is.Class Event F reporting period[ms] DCCC strategy Uplink bitrate threshold for DCCC Uplink mid bite rate calculate method Uplink mid bitrate threshold Uplink Rate adjust level Downlink bitrate threshold for DCCC Downlink mid bite rate calculate method Downlink mid bitrate threshold Downlink Rate adjust level Downlink BE guarantee bitrate Event F hysteresis time Reporting period unit for event F Event F reporting period[ms] Event F reporting period[min] Event Ea relative threshold Event Eb relative threshold Event E hysteresis time Reporting period unit for event E Event E reporting period[ms] Event E reporting period[min] Reporting period unit for event E Downlink BE guarantee bitrate Event F hysteresis time Reporting period unit for event F Event F reporting period[min] Event E hysteresis time Event E reporting period[ms] Event E reporting period[min] HUAWEI TECHNOLOGIES Co.Parameters Structure Cell reselection timer DCH to FACH transition timer BE HS-DSCH to FACH transition timer Realtime Traff DCH to FACH transition timer Cell reselection counter BE FACH to DCH 4A threshold BE FACH to HS-DSCH 4A threshold Realtime Traff DCH to FACH 4B threshold CellClass FACH to PCH transition timer CELLDCCC. The DtoFStateTransTimer increments 1 every time the UE in CELL_DCH state reports event 4b. HUAWEI Confidential Page 15 The left figure shows the Global Parameter Class. and it includes parameters: Cell reselection timer: This parameter is used to detect whether a UE is in the state of frequent cell reselection. BE FACH to DCH 4A threshold: Upper threshold of traffic volume triggering event 4a.DCCC . Ltd.. Cell reselection counter: For a UE in CELL_PCH.Class GlobalParaClass DCCC. that is.Class UESTATETRANS. if the number of cell reselections exceeds this parameter within the [cell reselection timer]. Realtime Traff DCH or HS-DSCH to FACH transition timer: This timer is used in detecting whether a real-time service UE in CELL_DCH state is in stable low activity state. triggering the transition from FACH to DCH. Firstly. FACH to PCH transition timer: This parameter is used to detect whether a UE is stable in low activity. 15 . BE HS-DSCH to FACH transition timer: This parameter is used to detect the stability of a UE in low activity state in CELL_DCH(with HS-DSCH) state. it can be considered that the UE is in the state of frequent cell reselection. triggering the transition from FACH to DCH (with HS-DSCH). and it will transit to the URA_PCH state. Realtime Traff DCH or to FACH 4B threshold: This threshold is used to judge whether a UE is in low activity state. Reporting period unit for event E (ChoiceRptUnitForE): The DL code TX power (if any) will be reported periodically after the event Ea is reported. Event E reporting period in 10ms: Valid when the parameter ChoiceRptUnitForE is set as TEN_MSEC. the bitrate may be supported in whole cell. it determines the event Ea threshold of the DL DPCCH power.Secondary. RATE_UP_AND_DWON strategy permit velocity rate up and rate down. When fails to get the DCCC parameters of best cell. However. However. The DL code TX power (if any) will be reported periodically after the event Fa is reported. The reporting period unit can be 10 ms or min. If it is set as A. Downlink BE guarantee bitrate: The default downlink BE guarantee bit rate of the cell. If it is set as A. This parameter is to specify the reporting period. Event E hysteresis time: The time allowance for the situation where the measured power is higher than the threshold. the hysteresis time is A*10ms. The UL DCCC algorithm does not activate for the BE service whose applied uplink maximum rate is smaller than or equal to the threshold. to avoid too more delay. this parameter cannot be set too great. In radio network planning. default value will be used. this parameter cannot be set too great. The DL DCCC algorithm does not activate for the BE service whose applied downlink maximum rate is smaller than or equal to the threshold. The downlink bitrate of BE service will be reduced to this bitrate when the DL transmit code power is higher than the threshold of the event Ea. If it is set as A. Event Eb relative threshold: Together with the maximum transmit power. so as to avoid the misreporting due to erratic fluctuation. If it is set as A. Downlink bitrate threshold for DCCC: The DCCC algorithm capability may be very low for some Best Effort (BE) service with very low applied maximum rate. and it includes parameters: Uplink bitrate threshold for DCCC: The DCCC algorithm capability may be very low for some Best Effort (BE) service with very low applied maximum rate. The DL code TX power (if any) will be reported periodically after the event E is reported. the hysteresis time is A*10ms. for the DCCC Class. DCCC strategy: The velocity of PS BE services adjust strategy in CELL_DCH state. Event F hysteresis time: The time allowance for the situation where the measured power is lower than the threshold. This means UE can transit from CELL_DCH to CELL_FACH state at any velocity . This parameter is to specify the reporting period. Reporting period unit for event F: The DL code TX power (if any) will be reported periodically after the event Fa is reported. 16 . RATE_UP_ONLY strategy just permit velocity rate up. it determines the event Eb threshold of the DL DPCCH power. Event F reporting period in 10ms: Valid when the parameter ChoiceRptUnitForF is set as TEN_MSEC. Event E reporting period in min: Valid when the parameter ChoiceRptUnitForE is set as MIN. so as to avoid the misreporting due to erratic fluctuation. Event F reporting period in min: Valid when the parameter ChoiceRptUnitForE is set as MIN. the reporting period is A*10ms. The DL code TX power (if any) will be reported periodically after the event Ea is reported. Event Ea relative threshold: Together with the maximum transmit power. to avoid too more delay. The reporting period unit can be 10 ms or min. The DL code TX power (if any) will be reported periodically after the event F is reported. the reporting period is A*10ms. the LMT command is SET/LST DCCC. the reporting period is A*10ms. so as to avoid the misreporting due to erratic fluctuation. If it is set as A. This parameter is to specify the reporting period. This parameter is to specify the reporting period. The DL code TX power (if any) will be reported periodically after the event Ea is reported. In radio network planning. Event F reporting period in min: Valid when the parameter ChoiceRptUnitForE is set as MIN. Event F hysteresis time: The time allowance for the situation where the measured power is lower than the threshold. Downlink BE guarantee bitrate: The downlink guarantee bitrate of the cell. the hysteresis time is A*10ms. The DL code TX power (if any) will be reported periodically after the event E is reported. Thirdly. so as to avoid the misreporting due to erratic fluctuation. Reporting period unit for event E (ChoiceRptUnitForE): The DL code TX power (if any) will be reported periodically after the event Ea is reported. Event E reporting period in 10ms: Valid when the parameter ChoiceRptUnitForE is set as TEN_MSEC. to avoid too more delay. Event F reporting period in 10ms: Valid when the parameter ChoiceRptUnitForF is set as TEN_MSEC. to avoid too more delay. Uplink mid biterate threshold: Uplink middle rate threshold when use 3 rate adjusting and middle rate calculate method is HAND_APPOINT. the hysteresis time is A*10ms. The DL code TX power (if any) will be reported periodically after the event Fa is reported. The reporting period unit can be 10 ms or min. Downlink Rate adjust level: The parameter is used to judge downlink 2 rates or 3 rates adjusting. If it is set as A. 17 . this parameter cannot be set too great. Downlink mid biterate threshold: Downlink middle rate threshold when use 3 rate adjusting and middle rate calculate method is HAND_APPOINT. The reporting period unit can be 10 ms or min. Uplink mid biterate calculate method: The parameter is used to decide the uplink middle biterate calculate method when 3 rates adjusting. the bitrate may be supported in whole cell. The downlink bitrate of BE service will be reduced to this bitrate when the DL transmit code power is higher than the threshold of the event Ea. Reporting period unit for event F (ChoiceRptUnitForF ): The DL code TX power (if any) will be reported periodically after the event Fa is reported. the LMT command is ADD/MOD/RMV CELLDCCC. and it includes parameters: Event E hysteresis time: The time allowance for the situation where the measured power is higher than the threshold. Event E reporting period in min: Valid when the parameter ChoiceRptUnitForE is set as MIN. If it is set as A.Uplink Rate adjust level: The parameter is used to judge uplink 2 rates or 3 rates adjusting. However. the reporting period is A*10ms. The DL code TX power (if any) will be reported periodically after the event F is reported. Downlink mid biterate calculate method: The parameter is used to decide the downlink middle biterate calculate method when 3 rates adjusting. this parameter cannot be set too great. If it is set as A. However. for the CellDCCC Class. firstly the rate switching is performed (downsizing). HUAWEI Confidential Page 18 For the Requested RAB rate < Uplink/Downlink Bitrate Threshold For DCCC service.DCCC . For the Requested RAB rate > Uplink/Downlink Bitrate Threshold For DCCC service.Strategy GlobalParaClass DCCC. if the UE activity is low. Ltd.. in Huawei implementation. only channel transition is performed. And for RATE_UP_AND_DOWN strategy. 18 .Class Strategy Channel Transition Requested RAB rate < DOWNLINK BITRATE THRESHOLD FOR DCCC or UPLINK BITRATE THRESHOLD FOR DCCC Requested RAB rate > DOWNLINK BITRATE THRESHOLD FOR DCCC or UPLINK BITRATE THRESHOLD FOR DCCC RATE_UP_ONLY RATE_UP_AND_DOWN Rate Switching √( D to F ) Step 2 (D to F) Step 1 (D to D) √(D to F) HUAWEI TECHNOLOGIES Co. secondly the channel transition does (D to F). two strategies are provided: one is RATE_UP_AND_DOWN strategy and the other is RATE_UP_ONLY strategy. C2D. Ltd. An RNC can initiate a dynamic channel configuration procedure through an RB reconfiguration procedure or transport channel reconfiguration procedure. VS.Succ VS.DCCC.SuccRateD own.Att HUAWEI TECHNOLOGIES Co.D2C..DCCC.UE Number of successful dynamic configurations to raise the DL bit rate of the PS BE service.DCCC.DCCC.Succ Number of Successful Dynamic Configurations for CCH to DCH Handover Number of Successful Dynamic Configurations for DCH to CCH Handover Number of successful dynamic configurations to lower the DL bit rate of the PS BE service.D2D. Number of handover attempts from DCH to FACH in a cell Number of handover attempts from FACH to DCH in a cell VS. The channel handover here refers to the handover between DCHs.D2D.C2D.UE VS.DCCC . An RNC can initiate a dynamic channel configuration procedure through an RB reconfiguration procedure or transport channel reconfiguration procedure.DCCC. HUAWEI Confidential Page 19 19 .Performance Counters Counter Description VS.DCCC. The channel handover here refers to a handover between DCHs.D2C.SuccRateU p.Att VS. Thank you! HUAWEI TECHNOLOGIES Co. So behind every project. Ltd. Thank you very much. there are over 24000 people supporting it.. That is a brief introduction about the company. 20 . We want to use this picture to show that in this company we stress teamwork as part of corporate culture. HUAWEI Confidential Page 20 The last but not the least.