Distribution

EnglishED01

Jae ho, Lee

Customer Training Center

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Contents

SON general information and structure

Self-Establishment

Self-Optimization

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SON function and Scope

3GPP SON specification

Samsung LTE SON Structure

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SON function and Scope

SON = (Self Planning) + Self Establishment

+ Self Optimization + (Self Healing)

LTE SON Server

eNB

More Efficient Operation of Telecommunication System

OPEX Reduction &Performance Enhancement

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SON Technology Scope

Self-Planning

- Automatically derive few Radio parameters for eNBs which will be established.

- Reduce amount of manual pre-planning Activities

- Reduce self-configuration errors

Network Lifecycle

Planning Deployment Optimization Maintenance

Self-Configuring

- Plug-n-Play Hardware- Self-Configuration Radio Parameters. Initial PCI,

. Initial NR,

. Initial PRACH configuration

- Automatic IP Acquisition- Automatic Neighbor Lists- Automatic Connectivity establishment

- Self-test and S/W download

Self-Optimizing

- Automatic Neighbor Relation Optimization

- Mobility Robustness Optimization

- Mobility Based Load balancing

- RACH optimization- Energy Cost Optimization

- Coverage & Capacity Optimization

Self-Healing

- Auto Cell Outage Detection

- Auto Cell Outage Compensation

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3GPP SON Specification

Function Contents Spec. Related specification

Self- Establishment(Self-Configuration)

Automation for eNB installation and initial radio parameter configuration(Initial PCI, Initial Neighbor configuration, Initial PRACH info.)

Rel-832.501, 32.502, 32.531, 32.532, 32.533, 32.537, 36.300

Self-Optimization

Automatic PCI Configuration

PCI is automatically allocated and re-allocation for PCI confliction.

Rel-8 36.902, 36.300, 36.423

Automatic Neighbor Relation

Detect Neighbor Cell automatically and Neighbor Cell List configuration(optimization)

Rel-832.511, 32.761, 32,762, 32.763, 32.76536.300, 36.331, 36.413, 36.423

Mobility Robustness Optimization

Detect the problem of Handover automatically and HO parameter configuration

Rel-932.816, 32.521, 32.522, 32.523,36.902, 36.300, 36.314, 36.423

Mobility Load Balancing Opt.

cell reselection /HO parameter optimization for cell traffic load balancing

Rel-932.816, 32.521, 32.522, 32.52336.902, 36.300, 36.314, 36.423

RACH OptimizationRACH parameter optimization and minimize interference for Access delay and RACH

Rel-932.521, 32.522, 32.523, 36.902, 36.300, 36.423

Inter Cell Interference Coordination

Improvement for edge performance with minimized neighbor-cell interference

Rel-836.213, 36.214, 36.42332.521, 32.522, 32.523

Coverage & Capacity Opt.

Analyzing the problem of Coverage and Capacity, CellCoverage and Capacity optimization

Rel-10 expected

32.816, 32.521, 32.522, 32.523, 36.902, 36.300, 36.423

Self-Healing

Alarm monitoringReal-time monitoring of alarms. Collection & Analysis for correlated informationTriggering of self-healing

Rel-10

32.541, 32.542, 32.543, 32.823

COD: cell outage detection COR: cell outage recovery COC: cell outage compensation

Self-recovery of NE S/W Recover NW S/W to initial states and recent backup states.

Self-healing of board fault

Detect Board fault and decrease and delete automatically the user impact.

Self-healing of cell outage

When it happen Cell outage, it stats automatic compensation for network problem (COD, COR, COC)

Minimization of Drive-TestsDefine the kind of UE measurement, collection method, transmission structure for replacing drive-test.

Rel-10TR 36,805 TS 37.320

Energy Saving ManagementDown energy cost for providing cell capacity as traffic requests,

Rel-10 TR 32.826 (new), TR 36.902 TS 32.551

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SON Structure (1) : Feature Overview

MSS*

LSM(EMS)

eNB

UE

Provision Deployment Operation & Maintenance

• eNB Provisioning- eNB type, ID, pkg, etc.

• eNB Establishment

1. Power On Self Test2. IP Acquisition (DHCP)- eNB ID, eNB IP, LSM IP3. eNB Registration4. SW Download & Check5. Configuration Download- Initial Radio Parameters

6. S1/X2 Setup (SCTP)7. RRH Configuration8. In-service

• Self-Configuration- Initial PCI, PRACH, NRT for eNB/Cell•eNB Registration

• KPI/Trace Monitoring• PCI/PRACH Collision Resolution

• Self-Optimization

• Measurements & Reports- Serving/Neighbor Signal Quality- Handover / RACH events

Event-based- ANR (Add)- PCI (Contention)- RACH (Collision)

HO Statistics-based- ANR (Ranking)- MRO- RACH (# of preambles)

RACH Statistics-based- RACH (time, power)

Traffic Statistics-based- Load Balancing

* MSS shall be provided by operator requirement.

• Interface with OSS (Operation Support System)• SON Data Interworking for Inter-LSM

- PCI, PRACH, NRT for eNB/Cell groups

•Self-Configuration (When it use MSS)- Initial PCI, PRACH, NRT for eNB/Cell

MSS: Master SON Server

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SON Structure(2)

MSS

LSM(EMS)

eNBSONF OAM CallP

Neighbor eNB

CallPX2 SETUP REQ/RSPENB CONF UPDATE

SONF

SONF

SON interface - Inter Vendor,- Inter LSM,- Inter RATOperator Specific SON interface

SON Interface- Self-Configuration - Self-Optimization

Configuration Update

Operator operation server, Integrated DB, Optimized Server

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Master SON Server Fucntion

Self Configuration

Initial PCI

Initial NR

Initial PRACH information

Support SC and SO function: LSM-LSM or integrity DB Coordination.

Initial PCI/RACH/NR information configuration precedure

When it deletes Cell/eNB

PCI Reconfiguration procedure

RSI Reconfiguration procedure

P5: After New PCI detection, ECGI obtaining (LSM based)

P6: After New ECGI obtaining, NR info. Configuration procedure(UE based)

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SON Operation per function

SON Operation Mode: Off / Manual Apply / Automatic Apply

Function SON Operation

Off Execute the collection of requested input data, there is no parameter-change.

Manual Apply After Operator의 confirm procedure, Parameter-change, Controlled Operation (open loop)in specification

Automatic Apply

Automatic parameter change, autonomous operation (closed loop) in specification

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SON Operation per function

SON’s Operation Mode per function

SON function

Off/Manual Apply/Automatic Apply operation

PCI

• Automatic apply : Initial PCI configuration(auto), X2 monitoring, Detect PCI collision/confusion, PCI re-configuration• Manual apply : Initial PCI Configuration(auto), X2 monitoring, Detect PCI collision/confusion, Request to operators for PCI re-configuration

• Off : X2 monitoring

ANR

• Automatic apply: If New PCI appear, add NR automatically, X2 monitoring, delete NR automatically with detecting neighbor cell and NR-ranking

• Manual apply: When it deletes Neighbors based Ranking/X2, Operator의 Request Confirm (Response) of operator• Off: X2 monitoring, NR-ranking starts with collecting Handover statistic data, no NR change

RACH• Automatic apply: Change Parameter automatically• Manual apply: Operator-confirm procedure is first and change parameter• Off: X2 monitoring, needed input data collection, No parameter change

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SE Procedure

SE Provisioning

SE Operation

HW Test (Power on Self Test)

Get eNB ID, eNB IP and LSM (EMS) IP automatically

S/W, Loading configuration info. and Validation check

S1/X2 auto-configuration

RRH Configuration

Report Self-Test result

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SE Provisioning environment/Configuration

Input system basic information

eNB Type

eNB ID

eNB serial number (In case of using DHCP key)

MME IP address

SC Mode configuration and initial parameter auto-creation

Initial Physical Cell Id

Initial neighbor information

Root Sequence Index

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SC item configuration (On/Off)

SC Result (On) [Off :need manual input]

Example (other Korea operator)

Select automation

PCI auto allocation

Initial neighbor auto-configuration

RACH optimization

Information

Add system

Detail information

Detail information

Cell Management

Information

Auto-allocation/initial neighbor/RACH opti.

State

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eNB ID, eNB IP, LSM IP Manual inputThe procedure of manual input

Configuration for eNB environment information

– Mandatory configuration

– BOOTSTATICIP : eNB의 IP address (Information related DHCP)

– BOOTSTATICMASK : BOOTSTATICIP net-mask (Information related DHCP)

– BOOTSTATICGW : BOOTSTATICIP의 GW address (Information related DHCP)

– RS_IP : LSM의 IP

– NE_ID : eNB의 ID

– serverip : LSM의 IP address

– ipaddr : eNB의 IP adress, same configuration with BOOTSTATICIP

– example

eNB Reboot starts

> Retrieve command : getenv [-a] <env_name>> Configuration command : setenv –p <env_name> <env_value>

root@UAMA:/root> setenv -p NE_ID 9 config string setenv completeroot@UAMA:/root> getenv NE_IDNE_ID=9

> reboot

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Retrieve configuration for S1/X2

S1 auto-configuration and retrieve the status

The function for retrieving S1 status

X2 auto-configuration and retrieve command

The function fort retrieving X2 status

Retrieve command

: RTRV-S1-STS;

Retrieve command

: RTRV-X2-STS;

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Self Optimization

Automatic Neighbor Relation ( ANR)

Energy Cost Optimization (ECO)

Inter Cell Interference Coordination (ICIC)

Physical Cell ID Auto Configuration (PCI)

Mobility Robustness Optimization (MRO)

RACH Optimization (RO)

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ANR Definition

ANR Operation

NRT Structure

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ANR Definition

Auto management for NRT (Neighbor Relation Table) on

Handover and Interference Management

Self Establishment step: Under Installation, Initial NRT auto-configuration using

operating eNB information

Self Optimization step: Under operation, Neighbor Add/Ranking/Remove /HO

Black list/Recover function of NRT

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ANR Operation

NRT Add: Add NRT and HO attempt

UE UE

eNB

(Serving Cell)

New eNB

(Target Cell)

UE⑩ Handover

(X2 or S1) ① UE measurement

⑨ X2 set-up

⑥ NRT Udate (Add a new cell)

LSM

iInitial NRT

⑤ report CGI

⑧ IP address acquisition of the new eNB

MME

③ Report CGI Request⑦ NR report

④ Read CGI② Measurement report (New PCI)

③ Report CGI Request

⑤ Report CGI

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ANR Operation

NRT Add: Field Test result in Korea

3 times x (Pingpong included) 10 HOs/count = 30 HOs are success

수원플라자

a

b

g

동수원

ab

매교

a

ANR 동작 지역들

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ANR Operation

Neighbor Ranking

Initial NRT: Ranking based on the length between BSs

Operating NRT: Ranking based on Handover Attempts, Handover Success

Handover Black List

Definition: ‘No HO’ field is On and no handover with Neighbors

No Relation ‘No HO’ unchecked ‘No HO’ checked

NR Add Operation1. NR add by operator

2. NR add by initial-NRT

3. NR add by UE-MR

NR Remove Operation1. NR remove by operator

2. NR remove by X2

‘No HO’ attribute ON1. Manual input by operator

2. NRT Full & NR-ranking

3. HO KPI

4. HO-to-wrong cell

‘No HO’ attribute OFF1. Manual Input by operator

2. HO-to-black cell

NR Remove Operation1. NR remove by operator

2. NR remove by X2

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NRT Construction

NRT contains1)

Target Cell Identifier (TCI)

E-UTAN Cell Global Identifier (ECGI)

Physical Cell Identifier (PCI)

No Remove: If checked, the eNB

shall not remove the Neighbour

cell Relation from the NRT.

No HO: If checked, the Neighbour

cell Relation shall not be used by

the eNB for handover reasons.

No X2: If checked, the Neighbour

Relation shall not use an X2

interface in order to initiate

procedures towards the eNB

parenting the target cell.

1) 3GPP TS 36.300 Section 22.3.2a

Neighbour

Detection

Function

Internal

Iinformation

RRC

Mrmnt

reportsMrmnt

requests

Ad

d/U

pd

ate

Ne

igh

bo

r R

ela

tio

ns

NR

re

po

rt

ANR function

eNB

O&M

NRadd

NRT

Managemnt

Function

Neighbour

Removal

Function

NRremove

NRupdate

Neighbor Relation Table

1

2

TCI

3

No

Remove

TCI#1

TCI#1

No HO No X2

O&M controlled

Neighbour Relation AttributesNeighbour Relation

NR

TCl#1

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ICIC Definition

ICIC Operation

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ICIC Definition

Improvement user’s throughput decreasing cell interference using

radio resource

Self Establishment step: not applicable

Self Optimization step: In operating, communicate interference information

between cells, control interference to allocate limited tx power(radio resource) for

users.

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ICIC Operation

Interference

① X2 Load Information

(I’m suffering from high interference)

② RSRP measurement

(I’m near the neighbor)

③ Tx power optimization

(Reduce Tx power!)

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PCI Auto-configuration Definition

PCI Auto-configuration Operation

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PCI Auto-configuration Definition

PCI (Physical Cell Identifier): Collision-free, Confusion-free, Unique

ID for identify the area for minimize interference between RSs

Collision-free: Two neighboring cells should not use the same PCI.

Confusion-free: A cell should not have two neighbors with the same PCI

Minimize interference among RS (cell-specific Reference Signal)

Self Establishment step: under installation, Initial PCI allocation is executed using

operating eNB information

Self Optimization step: in operating, Detect PCI collision/confusion and re-

allocation with exchanging message using X2 interfaces

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PCI Auto-configuration Operation

PCI Charactersitics1)

PCI (NcellID)는 PCI group (N(1)

ID) 과 PCI within PCI group (N(2)ID)

– 168 PCI groups * 3 PCIs/group = 504 PCIs

–

Using the area needed cell specific randomness like DL/UL physical channel

scrambling, resource element mapping, cyclic shift, hopping and reference signal

generation.

Needs optimization for re-using PCI

In Seoul 2,065 sites

– Main system 1,403 sites

– In-building 662 sites

1) 3GPP TR 36.211

(2)ID

(1)ID

cellID 3 NNN

650m

650m

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RO Definition

RACH Parameters

RO Operation

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RO Definition

Optimized allocation for RACH resource in Cell

Self Establishment step: under installation, executes Initial root sequence index,

PRACH configuration index, PRACH configuration offset allocation using operating

eNB information

Self Optimization step: in operating,

– Optimize the number of Dedicated Preamble using Handover statistic data.

– PRACH power/opportunity optimization based on UE information statistic data.

– Re-allocation after detecting root sequence index collision with exchanging X2 interface

messages

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RACH Parameters

RACH Procedure1)

Contention-based Preamble vs. Dedicated Preamble: Use 64 preambles in each

cell.

Preamble Initial Received Target Power, Power Ramping Step

PRACH Configuration Index

…

1) 3GPP TR 36.902, Section 4.7.4

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RO Operation (1/3)

Initial PRACH parameter auto-configuration1)

1) Initial NRT based on distance

2) Calculates average distance(D) between neighbor cell on Initial NRT

3) Calculation RSI (Root Sequence Index) Reuse Black List

– RSI Reuse Black List standard distance = max{ R, n*D}

– R: standard distance configured by operators, 0~100 Km, default = 0 Km

– n: standard configured by operators, 1~10, default = 2

4) Allocates2) RSI except RCI Reuse Black List

– If there is no available RSI, allocate max value of Reuse Distance

5) Allocates PRACH Configuration Index per sector

– PRACH Configuration Index: (alpha, beta, gamma) = (3, 4, 5)

– Over 4 sectors, allocates additional Root Sequence Index

1) It’s depend on operators2) High Speed Flag = False (default), Zero Correlated Zone Configuration = 12 (default)

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RO Operation (2/3)

Collection PRACH Data

Data collection based on X2 Handover Request/Response messages

– Dedicated Preamble Assignment Success/Fail

Data collection based on UE Information Request/Response messages

– Number of Preambles Sent

– Contention Detected

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RO Operation (3/3)

PRACH Data Analysis

Statistic analysis

– Threshold value is configured by operators

RACH Parameter Change

RACH Resource optimization considering RACH load, Handover, Random Access

Delay performance in operating.

– Dedicated Preamble allocation success-ratio

Number of RA Preambles Optimization

– UE Information (Preamble Re-transmission counts + Confliction counts)

PRACH Configuration Index, Power Ramping Step, Preamble Initial Received Target Power

Optimization

1

0.1

0 1 2 3 4 … … i i+1 100 [%]

Dedicated_fail_ratio

tbd

CD

F/P

DF

Th_de_upper = tbd

Th_de_increase = tbd %

YDed(k)

...