L11B_Auto Neighbour Relations

Automatic Neighbor Relations

FAJ 121 0497

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FAJ 121 0497, Automatic Neighbor Relations | Ericsson Confidential | 2011-04-06 | Page 2

›ANR is a licensed feature that automatically adds and removes neighbor relations and the supporting external references (highlighted):

ANR: Overview

ENodeBFunction

EUtranCellFDD

EUtranFreqRelation

EUtranCellRelation

EUtraNetwork

EUtranFrequency

ExternalENodeBFunction

ExternalEUtranCellFDD TermPointToENB


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ANR: Activation

Parameter Description

Anr: featureStateAnr Activates or deactivates the licensed feature ANR (automatic neighbor relations).

AnrFunctionEUtran:anrInterFreqStateActivates or deactivates the Automated Neighbor Relation (ANR) function support for Inter

frequency LTE for one RBS

AnrFunctionEUtran:anrIntraFreqStateActivates or deactivates the Automated Neighbor Relation (ANR) function support for Intra

frequency LTE for one RBS


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ANR: Intra- Frequency Measurement Reporting›ANR is triggered by

• mobility measurement report (ReportConfigEUtraBestCell)• ANR threshold based report (ReportConfigEUtraBestCellAnr)

›A relation is added if a neighbor cell with an unknown PCI is received and the Ue reports the CGI when ordered by ANR.


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ANR: Inter- Frequency Measurement Reporting

A2 (Bad Coverage)

A5 threshold1

Ncell

Scell

Power/Quality

Distance from ScellANR Reporting Measurement Reports

A5 threshold2

A5 threshold2 - a5threshold2Anrdelta

A5 threshold1 + a5threshold1Anrdelta

start bad coverage measurements


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ANR Reporting Algorithm


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ANR Triggered by Mobility


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ANR: Automatic Creation


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ANR: ANR Reporting Intensity and Neighbour Cell Eligibility

›Unknown PCIs in ANR reports are eligible based on configurable measurement thresholds• cellAddRsrpThresholdEutran • cellAddRsrqThresholdEutran

›ANR reporting intensity can be controlled by configurable parameters:

anrUesEUtraIntraFMax The maximum target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN intra-frequency neighbor cell reports

anrUesEUtraIntraFMin The minimum target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN intra-frequency neighbor cell reports

anrUesEUtraIntraFIncrAnr Increase in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN intra-frequency neighbor cell reports, every time a neighbor cell report for ANR is received with unknown neighbor cells

anrUesEUtraIntraFIncrHo The increase in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN intra-frequency neighbor cell reports, every time a neighbor cell report for HO is received with unknown neighbor cells

anrUesEUtraIntraFDecr The decrease in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN intra-frequency neighbor cell reports, every time a neighbor cell report is received with only known neighbor cells

anrUesEUtraInterFMax The maximum target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN inter-frequency neighbor cell reports

anrUesEUtraInterFMin The minimum target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN inter-frequency neighbor cell reports

anrUesEUtraInterFIncrAnr Increase in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN inter-frequency neighbor cell reports, every time a neighbor cell report for ANR is received with unknown neighbor cells

anrUesEUtraInterFIncrHo The increase in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN inter-frequency neighbor cell reports, every time a neighbor cell report for HO is received with unknown neighbor cells

anrUesEUtraInterFDecr The decrease in the target number of UEs in each cell, that are assigned ANR specific thresholds for EUTRAN inter-frequency neighbor cell reports, every time a neighbor cell report is received with only known neighbor cells


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ANR Intensity


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ANR: X2 Creation and Removal Policy

› Automatic creation of X2 TermPointToENB controlled by• x2BlackList in the eNB configuration• x2SetupPolicy in the ANR configuration

› Automatic removal of X2 TermPointToENB controlled by• x2WhiteList in the eNB configuration


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›A cell relation is removed if not used for removeNrelTime configurable amount of time›An external cell is removed if no relation exists for removeNcellTime configurable amount of time. ›X2 TermPointToENB is removed when last external cell is removed. ›External eNB is removed if it has no external cells for removeNenbTime configurable amount of time.›Removal of relations and external cells are controlled by parameter isRemoveAllowed

ANR: Removal Policy


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ANR: Automatic Removal

Documents

L11B_Auto Neighbour Relations