faj 221 3058 iflb activation threshold

Saudi Telecom Company (STC)SBS Team

Bukhari Masood Muhammad

IFLB ACTIVATION THRESHOLDFAJ 221 3058

Saudi Telecom Company | SBS Project | Masood Bukhari | 2015-07-02 | Page 01

FAJ 121 1880

HSDPA IFLS capability and priority handling

BACKGROUND FEATURE OVERVIEW FEATURE DESCRIPTION PARAMETERS DESCRIPTION FEATURE IMPACT NETWORK IMPACT FEATURE DEPENCIES FEATURE SCOPE ACTIVATION OBSERVIBILITY ROLLOUT ACCEPTANCE CRITERIA CONCLUSION

Contents


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BACKGROUND(Legacy Lb overview)



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Inter-Frequency LM



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Background/Problem Description› Inter-frequency Load Balancing

– Triggered as soon as neighbouring cells report load that is sufficiently lower than source cell’s load

load

loadload

Source cell

Target cell1

Target cell2

load_diff

if load_diff>lbThresholdthen trigger Load balancing



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Introduction of a load threshold that governs activation of Inter Frequency Load Balancing actions. The threshold can be configured per EUtranFreqRelation.

The feature provides an activation threshold for the Inter Frequency Load Balancing (IFLB) feature, which can be used to reduce the number of load

balancing actions taken by IFLB. As a prerequisite, the optional feature Inter-Frequency Load Balancing must be activated.

Rate Offset Mechanism to be disabledWhen the lbActivationThreshold is set to a value greater than zero, the rate offset

mechanism in IFLB is disabled for the relation. The rate offset mechanism is intended to direct a proportionally larger portion of the traffic to the cell with the

higher capacity in the low load scenario.The purpose of the lbActivationThreshold feature is to disable IFLB in the low load scenario.

Feature overview



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Feature Overview– Load in source cell above certain threshold– Trigger load balancing

loadload

Source cell

Target cell1

(freq1)

Target cell2

(freq2)

Load reports arrive

Virtually “raise” load to thresholdfreq1/2 level

Load above some threshold and loadsource-threhsoldfreq>lbThreshold

=> Load balancing triggered!

compare



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Feature description

lbActivationThreshold to Cell2

lbThreshold

lbActivationThreshold to Cell1

.

Inter-frequency Load Balancing is not triggered to target cell 2 if:

Source_cell_sub_ratio < lbthreshold + lbActivationThresholdCell2

Inter-frequency Load Balancing is triggered to target cell 1 if:

Source_cell_sub_ratio > lbthreshold + lbActivationThresholdCell1

Source cell sub. ratio

sub. ratiosub. ratio



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PARAMETER DESCRIPTION


Introduced Parameters

Parameter Description

lbActivationThreshold The minimum target cell load (subscription ratio) the source cell takes into account when determining the

amount of load balancing action to a cell using this carrier frequency.


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FEATURE IMPACTThis section describes the benefits of this feature.

›Operator controls when IFLB actions are triggered. ›UE measurements and handovers for IFLB are reduced.

Saudi Telecom Company | SBS Project | Masood Bukhari | 2015-07-02 |


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NETWORK IMPACTThis section describes how this feature impacts the network functions and

capabilities.

CoverageIFLB action is not triggered to a target frequency cell if the load in source cell is below the pre-configured load threshold.

MobilityThe Inter-frequency Load Balancing feature redistributes users in connected mode between inter-frequency cells by means of traffic load triggered inter-

frequency handover. The number of inter-frequency handover increases with this feature. The handover is typically performed in good radio conditions.



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Feature DEPENDENCYPrerequisite Features

Feature has below prerequisite feature

Affected FeaturesThis feature affects no other feature


Feature Description

Inter-frequency Load Balancing The feature provides a mechanism for managing the uneven traffic load distribution between different

carrier frequencies. The carrier frequency in the other network must be in the same LTE mode


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FEATURE SCOPEThe scope for this feature is all Ericsson eNBs (Riyadh and Jeddah) in STC N/W.



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FNI EXECUTION(ACTIVATION)Make sure site should have valid license for the feature and prerequisites..

Activation Commands:cvms b4_IFLB_ActivationThreshold

set IFLBActivationThreshold featurestate 1set EUtranCellTDD=T.....x,EUtranFreqRelation=39410 lbactivationthreshold XXset EUtranFreqRelation=1,EUtranCellRelation=4201-XYZ-ABC loadBalancing 1

set LoadBalancingFunction=1 lbThreshold 40cvms after_IFLB_ActivationThreshold



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OBSERVABILITY


Riyadh Trial:›The function of the feature is working fine as noticed number of loadbalaning

attempts is deviated according to lbActivationThreshold›The feature is recommended to be only at sites where loadbalancing attempt is high and causing aggrieve handover at Inter-freq. or high loadbalancing failures

›Adjust the feature with high activation threshold will cause to lose the balancing between the carrier

›Impact on loadbalaning attempt and number of connected users per carrier is shown below:

Next slides are the KPIs noted during trial of different values of lbActivationThreshold i.e 0, 500 and 300.

After trial, it was agreed to use lbActivationThreshold =0 for Riyadh Region


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OBSERVABILITY


Riyadh Trial:

Activation Threshold value = 500 showed aggressive reduction in the number of LBHOs while there was an imbalance seen in the number of connected users (refer to next slides)


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OBSERVABILITY


Riyadh Trial:

Activation Threshold value = 300 showed optimal reduction in the number of LBHOs while there was no imbalance seen in the number of connected users


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OBSERVABILITY


Jeddah Trial:IFLB Activation Threshold trial was done on two sites TNJ586 & TJD907 with 3

set of values (200, 300, 400).

Although both sites showed slightly different response, but on average the value 300 is better as it reduced the inter frequency handovers while keeping

the connected users balanced between the two carriers throughout the day

After trial, it was agreed to use lbActivationThreshold =300 for Jeddah Region


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OBSERVABILITY


lbActivationThreshold=200

Jeddah Trial:


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OBSERVABILITY



Jeddah Trial:


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ROLL OUT PROCEDUREAs mentioned in FNI Execution, rollout will be done in all eNBs in STC Network

(all Jeddah and Riyadh )

Below are the settings which will be followed during Rollout of the feature in Riyadh and Jeddah Region.


Paramter Settings IFLB Activation Thresho


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CONCLUSIONRiyadh MS Optimization team has opted to use the feature on ad-hoc based i.e.

where required so for RYD region the feature will be rolled out with lbActivationThreshold=0 while JED MS Opt team has opted to roll out the feature

with a baseline value of lbActivationThreshold=300 which has given optimial balance between # of RRC connected users and # of LBHOs.

.


faj 221 3058 iflb activation threshold

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