feature_ul efficiency - dch eul load balancing

Feature:UL efficiency - DCH/EUL load balancing

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Ericsson Confidential | 2010-09-30 |

WCDMA RAN W11B

HSPA Efficiency & Speed– 84 Mbps DL 64QAM-MIMO-MC– 56 Mbps DL MIMO-MC– 42 Mbps DL on 5MHz, MIMO- 64QAM– Dual Band HSDPA Multi Carrier

Application Performance– CPC on DUW– CPC Mobility, Iur, soft, softer– Speech 12.2 kbps and HSPA PS Interactive

RAB combination on DUW– Speech 12.2 kbps and multiple HSPA PS

Interactive RAB combination on DUW– AMR multi mode low rate and HSPA PS

Interactive RAB combination on DUW– Multiple HSPA PS Interactive RAB combination

on DUW

Application Performance– Fast Dormancy Handling

Transport– Ethernet Jumbo Frames on IuPS– Ethernet Link Aggregation for ET–MFX and

CMXB– L2GP support on CMXB and ET-MFX

Higher Subscriber Capacity– SRB on HS – DUW– Fractional DPCH - DUW– SRB on HS – Stand Alone– SRB on HS - Iur Mobility

New Features Enhanced Features

Broadcast– CBS - Emergency Optimizations

Higher Subscriber Capacity– High speed downlink for FACH– UL efficiency - DCH/EUL load balancing – Soft Congestion of 2 ms EUL users

TCO– Mixed Mode RBS

Transport– SRB on HS TN resource booking optimization– Soft Lock of ATM ET


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UL efficiency - DCH/EUL load balancingfeature overview

› The optional feature “UL efficiency - DCH/EUL load balancing” is new in WCDMA RAN W11B.

› The feature (with identity FAJ 121 1584 and License Key CXC 402 0054) is under license control per RBS

› The possibility to load balancing between DCH and EUL users is introduced. When this feature is activated the EUL throughput will increase at the expense of lower rate for DCH users. It performs congestion resolving action to release DCH UL resources, in order to make UU head room for EUL user. MP load will increase.

› It is recommended that the license for “Interact. PS (16/HS) + SRB (3.4/3.4)” (FAJ 121 905) is installed and activated, because the UL resource used by DCH needs to be low in order to make enough room for EUL users.

› This feature is not supported over Iur


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UL efficiency - DCH/EUL load balancingmechanism

› The new feature will work in the cell, when a valid license (controlled by NodeBFunction : licenseStateDchEulBalancing) is installed in the RBS, Eul : eulDchBalancingEnabled is set true, and RbsLocalCell : featureStateDchEulBalancing is activated.

› To check if the RBS is capable to handle this feature, the read only parameter, Eul : eulDchBalancingSupport , can be used.

› The Measurement Reporting procedure (Report A) is initiated when EUL scheduled rate falls below Eul : eulDchBalancingLoad and lasts for T1. Report is provided to RBS periodically controlled by Eul : eulDchBalancingReportPeriod.

› The Measurement Reporting procedure (Report B) is initiated and the periodic reporting is terminated when EUL scheduled rate rises above Eul : eulDchBalancingLoad and lasts for T1.

› The RBS monitors EUL performance and report it to RNC. If the report indicates that the EUL performance is bad, the cell is considered EUL congested and congestion resolving action is started, i.e. channel switching DCH users stepwise to lower rate, but not lower than lowest DCH UL rate. Amount of ASE in the uplink will be released with each periodic congestion-resolution action, controlled by Eul : releaseAseUlNg. The interval between periodic EUL congestion-resolution actions controlled by Eul : eulDchBalancingTimerNg. RAB establishment on EUL and highDCHrate or DCH to DCH UL upswitch is prohibited while EUL is congested.

› EUL congestion resolving action, in the early stage tries to resolve the congestion by switching down DCH users to lower DCH rate. Nevertheless, if the congestion passes an even lower threshold, Eul : eulDchBalancingOverload, it starts rejecting RAB establishment on EUL and DCH (above lowest DCH rate).

› If there is no EUL users in a cell and Eul : eulDchBalancingSuspendDownSw is “On”, the EUL Rate Cell Congestion resolving is suspended and do not downswitch users.

T1 T1 T1

Report A Report B Report APeriodic Report Periodic ReportTime

EUL Scheduled rate (kbps)

Measurement Threshold1=eulDchBalancingLoad

eulDchBalancingOverLoad

T1=Measurement Hysteresis Time+1

eulDchBalancingReportPeriod


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UL efficiency - DCH/EUL load balancingeul congestion handling policy

› The EUL_State, maintained in RNC, is updated according measurement report value, see above.

› Admitted when EUL uncongested(EUL Scheduled rate > eulDchBalancingLoad) OR EUL congested and the request type is “handover”

› Admitted(EUL) when EUL congestion is detected (eulDchBalancingOverload < EUL Scheduled rate =< eulDchBalancingLoad ) a request for EUL is admitted but request for an UL upswitch is Blocked.

› Blocked when EUL is even more congested (EUL Scheduled rate =< eulDchBalancingOverload ) the request type is “non-handover” and the rate for RAB establishment is above lowestDCHRate. RAB establishment is not blocked if eulDchBalancingOverload is set to 0

› HS cell change and Handover requests are always admitted by this resource manager.

eulDchBalancingLoad

eulDchBalancingOverload

Admission requests for EUL admitted, congestion resolving action not running,

Admission requests for EUL admitted +

congestion resolving action triggered+

UL upswitch blocked

Admission requests for EUL and DCH( not lowestDChRate) Blocked (retry on lowestDCHRate ) + congestion resolving action triggered + UL upswitch blocked

EUL_State = Uncongested

EUL_State = DetectedCongestion

EUL_State = HighCongestion

Time

EUL Scheduled rate (kbps)


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parameters

› The “UL efficiency - DCH/EUL load balancing” is operator configurable. The feature will work in the cell, when the RBS indicates that it is capable to handle the feature, the RNC parameter (Eul: eulDchBalancingEnabled) is True, and RbsLocalCell: featureStateDchEulBalancing is activated.

※A license (identity FAJ 121 1584 and License Key CXC 402 0054 ) is required. The license is on RBS level.

Operator Parameters

Name statue

Node-B

NodeBFunction : licenseStateDchEulBalancing

New

RbsLocalCell : featureStateDchEulBalancing

New

RNC

Eul : eulDchBalancingSupport New

Eul : eulDchBalancingEnabled New

Eul : releaseAseUlNg New

Eul : eulDchBalancingReportPeriod

New

Eul : eulDchBalancingLoad New

Eul : eulDchBalancingOverload New

Eul : eulDchBalancingTimerNg New

Eul : eulDchBalancingSuspendDownSw

New


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Related counters› RNC Counters - Eul : pmTotalTimeEulDchBalancing - Eul : pmNoFailedRabEstAttEulRateCong

› RNC EventsName Description

INTERNAL_RADIO_QUALITY_MEASUREMENTS_RNH Add EVENT_VALUE_EUL_SCHEDULED_RATE in EVENT_PARAM_MEASURED_ENTITY

INTERNAL_SYSTEM_BLOCK AddEVENT_VALUE_EUL_ RATE_CONGESTION In EVENT_PARAM_BLOCK_REASON

INTERNAL_ADMISSION_CONTROL_RESPONSE Add EVENT_VALUE_EUL_DCH_LOAD_BALANCING In EVENT_PARAM_FAILURE_REASON

INTERNAL_SYSTEM_UTILIZATION Add a new Event Parameter Name : EVENT_PARAM_EUL_SCHEDULED_RATE

INTERNAL_RAB_ESTABLISHMENT Add EVENT_VALUE_EUL_DCH RATE_CONGESTION in EVENT_PARAM_CAUSE_VALUE

INTERNAL_CHANNEL_SWITCHING Add EVENT_VALUE_EUL_DCH RATE_CONGESTION in EVENT_PARAM_CAUSE_VALUE

INTERNAL_RAB_RELEASE Add EVENT_VALUE_EUL_RATE_CONGESTION in EVENT_PARAM_CAUSE_VALUE

INTERNAL_SYSTEM_RELEASE Add EVENT_VALUE_EUL_DCH RATE_CONGESTION in EVENT_PARAM_CAUSE_VALUE

INTERNAL_CALL_SETUP_FAIL Add EVENT_VALUE_EUL_ RATE_CONGESTION in EVENT_PARAM_CAUSE_VALUE


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UL efficiency - DCH/EUL load balancingArrange of chosen sites

› TRNC17, TRNC20, TRNC44 › Time: 2010-10-22, 00:00~23:59

› EUL traffic and Ulps384Ratio, Ulps128Ratio

› KPI Formula:

– EUL traffic = pmUlTrafficVolumePsIntEul

– Ulps384Ratio = pmUlTrafficVolumePs384/(pmUlTrafficVolumePs384+pmUlTrafficVolumePs128+pmUlTrafficVolumePs64+pmUlTrafficVolumePs16+pmUlTrafficVolumePsIntEul)

– Ulps128Ratio = pmUlTrafficVolumePs128/(pmUlTrafficVolumePs384+pmUlTrafficVolumePs128+pmUlTrafficVolumePs64+pmUlTrafficVolumePs16+pmUlTrafficVolumePsIntEul)


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UL efficiency - DCH/EUL load balancingAudit and investigation

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EUL traffic

UL384ratio

UL128ratio

EUL traffic_RNC17,20,44_20101022

› Not choose BH092A, for the Ulps384Ratio and Ulps128Ratio is very small, the feature effect will not be obvious.

› Choose BG208Y and BG207Y, for the EUL traffic is high, and sametime Ulps384Ratio and Ulps128Ratio is somewhat high. Foreseen, the effect is obvious.

› CA242Y and BA138A could be RBS for backup› Audit result is sticked in the excel object beside.


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UL efficiency - DCH/EUL load balancingRBS BG208Y_20101022

› From 10:00 to 21:00, the five different Ul traffic is high› During these hours, EUL has the highest traffic, PS128 and PS384 has almost same traffic› In busy hours, EUL Thrput is low, and R99 Ul Thrput is high. R99 Ul downswitching could return

better of “EUL Schedule rate” obviously.› In 11:00~17:00, when UL traffic is high, the UL throughput is degraded because of the resource

shortage

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EUL Throughput

R99 Ul Throughput

EUL traffic

PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic

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EUL Throughput

R99 Ul Throughput

EUL traffic

PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic


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UL efficiency - DCH/EUL load balancingRBS BG207Y_20101022

› From 10:00 to 21:00, the five different Ul traffic is high› During these hours, EUL has the high traffic, PS128 and PS384 has almost same traffic› In busy hours, when Ul throughput degraded by high traffic, this feature can improve the

UL throughput by down-switching R99 connections

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EUL Throughput

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PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic

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EUL Throughput

R99 Ul Throughput

EUL traffic

PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic


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UL efficiency - DCH/EUL load balancingRBS CA242Y_20101022

› From 9:00 to 20:00, the five different Ul traffic is high› During these hours, EUL has the high traffic, PS384 in 12:00~13:00 has very high traffic› In busy hours, EUL Thrput is low, and R99 Ul Thrput is high. R99 Ul down-switching could

return better of “EUL Schedule rate” obviously.

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EUL Throughput

R99 Ul Throughput

EUL traffic

PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic

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EUL Throughput

R99 Ul Throughput

EUL traffic

PS16 Ul traffic

PS64 Ul traffic

PS128 Ul traffic

PS384 Ul traffic

ThroughputTraffic


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UL efficiency - DCH/EUL load balancingCounters

› EUL related Counters– pmCommonChPowerEul – pmLEDchTot – pmLMaxEDch – pmLOther – pmEdchIubLimitingRatio – pmNoAllowedEul – pmSumEullRlcUserPacketThp – pmEulRlcUserPacketThp – pmOwnUuLoad – pmTotRateGrantedEul – pmCommonChPowerEul – pmNoRabEstablishAttemptPacketInteractiveEul – pmNoRabEstablishSuccessPacketInteractiveEul

– pmNoUlUuLoadLimitEul– pmLMaxEDch – pmHwCePoolEul – pmNoUlHwLimitEul – pmGrantReductionReasonEul


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UL efficiency - DCH/EUL load balancingCounters

› Counters related to EUL resource shortage– pmOwnUuLoad

› shows the power-controlled noise rise caused by the intra-cell interference that affects the Uu load. When the own cell interference goes above eulMaxOwnLoad, there is no headroom reported to the EUL scheduler.

– pmNoAllowedEul › measures the number of times that no EDCH traffic is allowed due to uplink

interference – pmHwCePoolEul

› shows the total sum of CEs allocated on the UL hardware by the E-UL scheduler – EUL Scheduled rate = (pmSumAckedBitsCellEulTti10 +

pmSumAckedBitsCellEulTti2 ) / ( 0.01 * pmNoActive10msFramesEul+ 0.002*pmNoActive2msFramesEul)

– pmGrantReductionReasonEul › Counter for recording the number of grant reductions made by EUL Scheduler due to

different reasons. The count for each reason is given by a separate bin - TN Congestion - Uu Congestion Serving- Uu Congestion Non-serving- HW Congestion- Low usage happy

- Low usage unhappy - Inactivity at low grant - Inactivity at high grant - Rescheduling

Note: EUL resource shortage can be indirectly reflected by these counters


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UL efficiency - DCH/EUL load balancingreference

› UTRAN Vocabulary, 1/0033-HSD 101 02/x

› RS/NDS Work Instruction, 2/00021-FEA 201 556/1

› FS Capacity Management Algorithms, 30/15517-HSD10102/7

› UTRAN FS Generic RAB (GRAB) Specification, 398/155 17-HSD 101 02/10

› Congestion Control,133/155 16-HSD 101 02/6

› Admission Control, 151/155 16-HSD 101 02/5

› Enhanced UL Scheduler, 112/1553-HSD 101 02/10

› dIWD: NBAP for EUL DCH load Balancing, 33/155 19-FCP 101 8201

› Delta ExcHand Definition for DCH/EUL load balancing, 33/0363-FCP 101 8201

Key Reference› NDS UL efficiency - DCH EUL load balancing, 57/102 68-FCP 101 8201 Uen

Optional Reference


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feature_ul efficiency - dch eul load balancing

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