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Nokia Academy LTE2210 Intra-Frequency Load Balancing Extensions RA4115 FL16 Feature Overview

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LTE2210 – Intra-Frequency Load Balancing Extensions Agenda Feature Overview Configuration and Testing Test Results Operational Hints and Guidelines

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Feature Overview

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Feature Overview

LTE2210 – Intra-frequency load balancing extension • This feature is related to the features: -

LTE1140 – Intra-frequency load balancing. Allows a source cell to establish partnerships via X2 to exchange CAC when source load exceeds a pre-defined threshold, then based on neighbor cell CAC is able to modify the CIO for UEs in order to trigger HO sooner to offload traffic to neighbors. Effectively shrinking the source cell coverage area and extending neighbor cells.

-

LTE1113 / LTE1496 – eICIC. Load based scheduling coordination between macro and small cells in a HetNet to minimize interference for small cells on the same frequency as the macro cells.

• Primary purpose of the feature is to extend the dynamic intra-frequency load balancing mechanism to work with eICIC. LTE2210 can provide intra-frequency load balancing via delta CIO if LTE1140 and/or LTE1113/LTE1496 is enabled. • LTE2210 also enhances LTE1140 (if enabled) to support handling RSR procedure in response to X2 Reset / Setup / link drop and reset of RSR contexts and delta CIO values.

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Feature Overview

LTE2210 – Intra-frequency load balancing extension general concepts •

In every eICIC area, consisting of one macro cell and N small cell eICIC partners, two eICIC related adaptation loops are available: -

the ABS adaptation loop

-

the CIO adaptation loop (new with LTE2210)

•

The ABS adaptation adjusts the macro cell applied ABS pattern based on the current load conditions in the entire eICIC area. An ABS pattern is valid for all established eICIC partnerships. The CIO adaptation adjusts the CIO per eICIC partnership based on the current load condition for each small cell neighbor individually.

•

For the two adaptation loops the intention is to execute ABS adaptation more often than CIO adaptation. ABS pattern adjustment has an immediate impact on the load and it provides immediate reaction to sudden load changes in the eICIC area. A CIO modification needs more time to impact the load since the related HOs have to happen first and this depends on the current UE location. ABS pattern modification requires much less control signaling than a CIO modification.

•

The goal of the CIO adaptation is to determine the optimum CIO adjustment for each small cell eICIC partner in order for the total small cell load and/or the small cell ABS load to reach preconfigured target values.

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Feature Overview

LTE2210 – Intra-frequency load balancing extension general concepts •

In every eICIC area, consisting of one macro cell and N small cell eICIC partners, two eICIC related adaptation loops are available: -

the ABS adaptation loop

-

the CIO adaptation loop (new with LTE2210)

•

The ABS adaptation adjusts the macro cell applied ABS pattern based on the current load conditions in the entire eICIC area. An ABS pattern is valid for all established eICIC partnerships. The CIO adaptation adjusts the CIO per eICIC partnership based on the current load condition for each small cell neighbor individually.

•

For the two adaptation loops the intention is to execute ABS adaptation more often than CIO adaptation. ABS pattern adjustment has an immediate impact on the load and it provides immediate reaction to sudden load changes in the eICIC area. A CIO modification needs more time to impact the load since the related HOs have to happen first and this depends on the current UE location. ABS pattern modification requires much less control signaling than a CIO modification.

•

The goal of the CIO adaptation is to determine the optimum CIO adjustment for each small cell eICIC partner in order for the total small cell load and/or the small cell ABS load to reach preconfigured target values.

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Feature Overview

LTE2210 – Intra-frequency load balancing extension general concepts •

CIO adaptation for eICIC can configure separate CIO values for R8/9/10 UEs and R11 UEs in order to exploit the interference mitigation capabilities of R11 UEs that support FeICIC.

•

QCI of bearers allocated to a UE can determine CIO.

•

With the introduction of LTE2210-B following changes apply regarding the eICIC specific CIO parameters: -

O&M parameters eIcicMaxG2CioMacro and eIcicMaxG3CioMacro are removed for the macro cell feature LTE1113.

-

O&M parameters eIcicMaxG2CioNonMacro and eIcicMaxG3CioNonMacro are removed for the small cell feature LTE1496.

•

CIO adjustment refers to value of LNREL parameter cellIndOffNeighDelta which is dynamically determined by macro cell CIO algorithm for eICIC for each partner cell.

•

ABS must be active for dynamic CIO adjustment. If ABS is inactive (MP0) the cellIndOffNeighDelta will be set to zero.

•

CIO algorithm is target load driven and configurable based on partner CAC threshold or partner ABS load threshold.

•

When macro cell determines CIO needs to be changed it is done via X2 Mobility Change Request message.

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Feature Overview

Mobility Change Request (MCR) Procedure • In macro cell, when new CIO adjustment is available for a small cell eICIC partner n, eICIC manager sets the MCR message IEs -

Cause := ‘Load Balancing’

-

eNB2 Proposed Mobility Parameters := Mobility Parameters Information -> Handover Trigger Change := new deltaCio

• Small cell n accepts CIO adjustment:

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-

Small cell n sends MCA (Mobility Change Accept) message,

-

eICIC manager updates the LNREL parameter cellIndOffNeighDelta for small cell n and starts timer TCioModProhibit.

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Feature Overview LTE2210 Feature Details •

•

CIOcur(n) = default CIO + cur. CIO adjustment = cellIndOffNeigh + cur. cellIndOffNeighDelta represents the current total CIO value of small cell n in dB configured at macro cell. CACtarget = O&M parameter eIcicPartnerCacTarget. By setting this parameter

the operator declares preference on the aspired target CAC or target load for the small cell eICIC partners. Note that loadtarget = 100-CACtarget. •

CACABS,target = O&M parameter eIcicPartnerCacAbsTarget. By setting this parameter

   100 − CAC target   + CIOcur (n);  5b ⋅ log  100 − CAC (n)          100 − CACABS,target  CIOcur ( n ) 5b    CIOnew (n) = INT min 5b ⋅ log ⋅ 10 − 1  + 1;   100 − CACABS (n)         cellIndOffNeigh + eIcicMaxCre    

the operator declares preference on the aspired target ABS CAC or target ABS load for the small cell eICIC partners. Note that loadABS,target = 100CACABS,target.

•

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= cellIndOffNeigh + new cellIndOffNeighDelta

Variable b represent (existing) O&M parameter largeCellBeta,

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       in [dB]      

Page: 10 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 3:28:08 AM For simplicity in formula implementation, the values CAC(n) = 100 and CACABS(n) = 100 are mapped/ changed to 99. The function “INT[∙]” rounds the number in [∙] down to the nearest integer number.

Feature Overview LTE2210 Feature Details

• Following rules (checked by the macro cell eICIC manager) must be obeyed when determining the new CIO adjustment: -

The new total CIO value CIOnew(n) must be included in the 3GPP range {-24 ... 24}dB for RRC signaling. •

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This includes the case of CIOnew(n) > 6dB (or