itri son for small cell

Copyright 2015 ITRI 工業技術研究院

建議字型：中文微軟正黑體，英文Arial

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Introduction to ITRI’s SON Technology



SON的流程

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ITRI Advanced SON Features

SON Functions Description

PCI (Physical Cell ID) • Physical Cell ID Assignment • PCI Collision Handling • Existing Cell PCI Confuse Handling • New Cell PCI Confuse Handling • Enhanced PCI Handling

ANR (Automatic Neighbor Relation) • Automatic Neighbor Relation Establishment/Maintenance/Optimization

MRO (Mobility Robustness Optimization) • Cell Re-selection of Mobility Robustness Optimization • Too Late/ Early Handover of Mobility Robustness Optimization • Handover to Wrong Cell of Mobility Robustness Optimization • Ping-Pong Effect of Mobility Robustness Optimization • Smart Antenna based MRO

MLB (Mobility Load Balancing) • Mobility Load Balancing for Active/Idle Users

RO (RACH Optimization) * • Contention Based/Contention Free RACH Optimization

CCO (Coverage and Capacity Optimization) • The CCO function is configured through appropriate targets in order to meet the operator’s requirement on coverage and capacity

Cell Outage & Compensation • Automating outage detection and problem resolution

* Released in 2015/12 3



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SON功能描述 -- Self-Configuration

Automated Configuration of PCI Automating to handle conflict PCI when adding new eNB

New cell conflicts New cell confuses New cell gets confused

PCI = PSS + 3*SSS Cell Specific Freq. Shift



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SON功能描述 -- Self-Configuration

Automated Neighbor Relation (ANR) Removing labor-intense works when adding new eNBs

Increasing successful handover rate

New cell

Cell #1

Cell #2

Cell #3

SON Server

SON Client



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SON功能描述 -- Self-Optimization

Mobility Load Balancing (MLB) Balancing traffic & load

Increasing system capacity

exchanging cell specific load information between neighbour eNBs

enables source cell to request a change of handover parameters and/or reselection parameters at target cell



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Mobility Robustness Optimization (MRO) Eliminating Radio Link Failures

Reducing unnecessary Handovers

Cell A

SON Client

Cell B

SON Client

Handover Failure

Re-establishment

Radio Link Failure (RLF)

Modify HO Threshold

• Too Late HO

• Too Early HO

• HO to a Wrong Cell

• Ping-pongs

SON Server

Modify HO Threshold Report HO

Failure



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RACH Optimization The configuration of the random access procedure has a critical impact on end-user experience and overall network performance.

A poorly configured Random Access Channel (RACH) may increase access setup time and accesses failures, impacting both call setup and handover performance.

With optimal random access parameter setting, maximum end-user experience can be obtained.

SIB2可發送參數(prach-Config) RACH Load and Configuration



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SON功能描述 -- Self-Healing

Coverage and Capacity Optimization (CCO) The CCO function is configured through appropriate targets in order to meet the operator’s requirement on coverage and capacity

CCO features always optimize coverage and capacity continuously by collecting "real-network" measurement (MDT).



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SON功能描述 -- Self-Healing

Cell Outage & Compensation Automating outage detection and problem resolution

No need for human intervention

Cost reduction

Outage cell

Cell #1

Cell #2

Cell #3

SON Server

Step2. Calculating Impact Step3. Root cause analyses and prioritization

SON Client

SON Client

SON Client

SON Client



ITRI Advanced SON Differentiation (1/2)- Self-Configuration

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• Multiple cells coexistence

Enhance to handle 14 PCI collision scenarios

Handover Optimization for Smart Antenna

Advanced eICIC for Active/ Idle Users



(1) 基地台亂數調整其TxPower Coverage: 38.13%

ITRI Advanced SON Differentiation (2/2)- Self-Healing

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• CCO (Coverage and Capacity Optimization)

實驗顯示ITRI’s Ant Colony Algorithm效能可以提升覆蓋範圍約38.19%

(3) 螞蟻演算法(Ant Colony Algorithm) Coverage: 69.32%(38.19%↑)

(2) 兩基地台干擾過大時, 調整鄰居最多的基地台TxPower直到重疊區域干擾可以接受 Coverage: 49.28%(11.15%↑)

Natural Behavior of Ant