09_01_RA41129EN05GLA0_Self Optimizing Networks - SON

1 © Nokia Siemens Networks RA41129EN05GLA0

LTE Self Organizing Network (SON) RL40


Nokia Siemens Networks Academy

Legal notice

Intellectual Property Rights

All copyrights and intellectual property rights for Nokia Siemens Networks training documentation, product documentation and slide presentation material, all of which are forthwith known as Nokia Siemens Networks training material, are the exclusive property of Nokia Siemens Networks. Nokia Siemens Networks owns the rights to copying, modification, translation, adaptation or derivatives including any improvements or developments. Nokia Siemens Networks has the sole right to copy, distribute, amend, modify, develop, license, sublicense, sell, transfer and assign the Nokia Siemens Networks training material. Individuals can use the Nokia Siemens Networks training material for their own personal self-development only, those same individuals cannot subsequently pass on that same Intellectual Property to others without the prior written agreement of Nokia Siemens Networks. The Nokia Siemens Networks training material cannot be used outside of an agreed Nokia Siemens Networks training session for development of groups without the prior written agreement of Nokia Siemens Networks.


Contents

LTE SON Overview

LTE SON Plug and Play Process

NetAct Tools and Preparation


LTE SON has key operational benefits

Self Quality

Capacity

Coverage

Healing

• Error self-detection and mitigation

• Reduced operator effort

• Faster maintenance

• Reduced outage time

Optimization

• Error self-detection and mitigation

• Reduced operator effort

• Faster maintenance

• Reduced outage time

Configuration

• Simplified installation procedures - less prone to errors

• Faster roll-out

• Fewer drive-tests

• More flexibility in logistics (no site specifics)

• Reduced site planning


SON Tools

SON Data Multi-vendor Data Network Data CM, FM, PM

WCDMA/GSM LTE Vendor Y Vendor X

• NetAct

Configurator Monitor & Reporter

Optimizer SW Manager

SON Workflow Coordinator

Planning tools

Management Network Engineering

Planning tools Network Operations

… …

Centralized SON

Distributed SON


LTE SON Features

LTE Plug and Play (LTE154 / 720)

PCI Management (LTE468)

Cell Outage Detection and Triggered Reset (LTE432 / 502)

Mobility Robustness (LTE533)

PRACH Management (LTE581)

Interface Trace Support (LTE690)


Automated Neighbor Relation (many related features)


Automated Neighbor Relations (ANR) in LTE

The steps of ANR process

• Neighbor cell discovery

• Neighbor Site’s X2 transport configuration discovery

• X2 Connection Set-up with neighbor cell configuration update

• The handset mobility relies on information given by neighbor cells and the quality of it

• The ANR function automates and optimizes that handover process with real-time information exchange between the parent cell (source) and receiving cell (target)

• The automated neighbor relations remove manual planning, maintenance and subsequently errors from the process


Summary of ANR Features by Release


Automated Neighbor Relations (ANR) in LTE

Central ANR (RL10 LTE539)

• Requests NetAct Configurator and Optimizer to automatically generate LTE intra-frequency neighbor relations for a new eNB of an LTE network during auto-configuration, and to automatically update the neighbor relations of the corresponding neighbor eNBs.

• X2 Signaling connection is always established on eNB startup for adjacencies defined in this feature.

Automated Neighbor Relation for LTE (RL20 LTE492)

• The neighbor site evaluation for an new eNB is done by NetAct and ends in a PCI/RF/IP-address mapping table which is configured at eNB during auto-configuration procedure

• During operation the eNB obtains UE measurements with still unknown PCI values.

• If an unknown PCI is detected to the Flexi Multiradio BTS, the corresponding C-plane IP-connectivity information (IP@) of the neighbor site is resolved, and the X2 signaling connection is set up in order to exchange neighbor cell information, the X2 interface is opened for control layer applications

• Feature is handled within eNB and NetAct OAM application, it is transparent to the UE.

3GPP Automated Neighbor Relation Fully UE Based (RL30 LTE782)

• Standardized by 3GPP

• Requires UE support, will have to identify Cell Global ID while in active mode.

• Requires MME to support transport network discovery between source and target eNB.


Automated Neighbor Relations (ANR) in LTE (LTE492)

Prerequisite

•Geo-locations and

•Antenna direction has to be configured for all LTE cells at NetAct Configurator non-network parameters.

•External LTE cell can be configured in case of several NetAct clusters support one LTE network

•The operator has to ensure, that the LTE cell black-lists (blacklistHoL) does not contain the PCIs in the PCI/IP address table, that shall be learned by LTE492: ANR.

•The neighboring eNBs have IP connectivity to establish a X2 link.

•All the neighbor eNBs have LTE492 or LTE782 activated to accept the incoming calls.


Automated Neighbor Relations (ANR) Fully UE Based (LTE782)

Active/Passive ANR

• In order to reduce the probability of call drops, the Flexi Multiradio BTS supports ANR mechanisms in order to detect and configure any unknown neighbor cell as early as possible and not at the time when the first HO to a newly detected cell is triggered. This kind of operational mode of ANR is further referred to as active ANR.

Active ANR

• If Active ANR handling is started, the Flexi Multiradio BTS will pro-actively scan for unknown Intra-frequency LTE cells.

Passive ANR

• If no unknown cells need to be detected anymore, ANR operates as a background task, for example Flexi Multiradio BTS does not configure ANR-specific measurements but uses normal measurement reports (as received for HO) for the detection of unknown cells.


Related ANR Features

Synchronization of Inter-RAT Neighbors (LTE510)

• Establish new InterRAT neighbor relations also in case new UTRAN/GERAN cells are created to optimization scope of an existing LTE cell.

• All relevant parameters for Inter RAT neighbor relation establishment will be provided by Nokia Siemens Networks management system (NetAct) in case of a co-existing Nokia Siemens 2G/3G network or by Nokia Siemens Networks management via northbound interface (Itf-N), in case of another Nokia Siemens NetAct regional cluster or other vendor's co-existing 2G/3G network.

ANR Inter-RAT UTRAN and GERAN (LTE783/784)

• The configuration of InterRAT neighbor relations is handled by NetAct, whereby configuration data relevant for InterRAT neighbor relations are uploaded and retrieved from any existing UTRAN network configuration management database and corresponding InterRAT neighbor relations created for the relevant Flexi Multiradio BTS, taking into account

the geo-location of the source (LTE) and target UTRAN / GERAN site / cell antenna

sectorization/antenna horizontal main lobe direction of source LTE and target UTRAN / GERAN cells (The algorithm does not take into account whether the source and target are co-located)

Optimization of Intra-LTE Neighbor Relations (LTE771)

• NetAct Optimizer monitors PM data related to handovers between neighbors added via ANR feature to determine if neighbor should be blacklisted due to poor performance.


Cell Outage Detection and Cell Outage Triggered Reset

Based on performance measurement data

Thresholds can be defined to determine how long a lack of UE activity determines a “sleepy cell”

Outage triggers a QOS alarm to indicate cell is out of service

Based on the cell out of service alarm, a cell reset may be triggered automatically to try to restore normal cell operation

Thresholds are defined and then operator intervention is not required to restore cell functionality


SON Automation and Optimization


• Enables automated optimization of handover-related thresholds like HO offsets (CIO) and Time to Trigger (TTT).

• Based on long-term evaluation of performance measurements.

• Additional PM counters for Late HO, Type 1 Early HO, and Type 2 Early HO counters.

Minimization of Drive Tests (LTE953)

• Reduce the need for drive tests to optimize cell coverage in intra-frequency LTE networks.

• Automated collection of interface trace data along with UE periodic measurements based on preconfigured profiles.

• NetAct Traceview tool has profiles for detection of coverage problems and monitoring coverage quality.

• Requires LTE433 Cell Trace, LTE644 Configurable Cell Trace Content, LTE570 Periodic UE Measurement features.

SON Reports (LTE1019)

• Provides NetAct users a history of CM parameter changes related to SON management features (see list in notes)

• Allows reports based on specific criteria, for example filtering by time, network element, parameter, parameter value, trigger of change.

Inter-RAT Auto Setup and Scheduled Optimization

• Allows automated triggering of Inter-RAT neighbor relation features and optimization of Intra-LTE network features.

• Auto configuration preferences can include automated execution of ANR for Inter-RAT UTRAN and GERAN (LTE783/784) features.

• Time based scheduling of:

• LTE510: Synchronization of Inter-RAT Neighbor Relations

• LTE533: Mobility Robustness

• LTE771: Optimization of Intra-LTE Neighbor Relations


SON Automation and Optimization (cont.)

PCI Management (LTE468)

• Allows NetAct Optimizer to automatically calculate physical cell ID (PCI) without interfering with neighbor cells.

• Only 504 possible values and calculation based on geographic location of cells.

PRACH Management (LTE581)

• PRACH values need to be unique for neighbor cells to prevent UE from neighbor cells from interfering with UE random access procedures.

• NetAct Optimizer tool can use cell geographic location and related cell parameters to calculate values for the following parameters:

• PRACH cyclic shift

• PRACH configuration index

• PRACH frequency offset

• PRACH Root sequence

Interface Trace Support (LTE690)

• Allows interfaces (S1, X2, RRC) to be traced and forward data to TraceViewer tool.

• Required for minimization of drive test feature.


LTE SON Plug and Play Auto connection and Auto configuration Overview


SON Plug and Play

SON Plug and Play automates the BTS network integration. While the manual BTS network integration procedure requires specialist field staff and even several site visits, at best SON Plug and Play downloads all needed data like SW upgrades and initial parameter configuration from NetAct and makes BTS up and running in minutes.

This one-touch self-commissioning deployment is industry unique simplifying the network setup markedly.

The SON Plug and Play uses in the process minimal human interaction eliminating the possibility for errors and cutting costs as engineers need to spend less time on site.

The steps of SON Plug and Play process

• Auto-connection: Flexi Multiradio BTS self detects IP network, identity, location

and parameters, connects to NetAct and carries out self-configuration.

• Auto-configuration: NetAct assigns initial parameter values and downloads

automatically configuration data and SW builds to Flexi Multiradio BTS


Key Benefits of the SON Plug and Play

Automated network integration is fast and error-free reducing total effective work time as installation experts spend less time on site

25% faster roll-outs and faster time to market

Faster return on investment

Reallocation of highly skilled engineering resources to other areas of network operations


BTS Installation process with SON Plug and Play

Wait auto conf to start

3. Auto Configuration

Physical site/BTS

construction

Power On/

Self Test

Security Authentication

VPN establishment

NetAct

(NE planning data)

2. Auto Connection

Transport parameters - probing

- IP address from DHCP

Site acceptance testing

Site “on-The-Air”

1.Planning process

SW update

“Site yyy Configuration parameters downloaded”

BTS serial number to NetAct: “HW Fxx Installed to Site yyy”


Auto Connection & Auto Configuration Features (optional)

Auto connection

Auto connection is a feature which enables the automated connection of the new or uncommissioned BTS to a server in the network through which commissioning may be automatically performed.

The automated connection means the automatic establishment of IP connectivity over which IP based registration messages can be sent.

Using the location information of the newly installed BTS, OMS server can correlate the BTS with the required logical configuration (may also used Site ID, or HW ID).

After installation, the automatic establishment of a connection allows the commissioning to be completed remotely without the need for a commissioner to visit the site.

Auto configuration

Auto configuration is a feature in which NetAct is able to automatically perform SW update and push site commissioning file to the BTS.

Once a connection between BTS and OSS is established, the BTS sends a request to trigger the auto configuration.

BTS may identify itself via HW ID, Site ID, or GPS coordinates.

Once complete, the new site is on-air and adjacency information can be updated to exisiting BTS automatically – without the need for a site visit to perform commissioning.


NetAct

Manual Site

Installation

self tests (POST)

DHCP

Manual site

Installation &

self tests (POST)

security

server

dedicated

iOMS

Backhaul

Establish Ethernet Connectivity

DHCP: BTS IP@ & vendor specific parameters

security server IP@, dedicated iOMS IP@

Authenticate to operator’s security server with NSN NE

vendor Certificate (via CMP)

Download operator’s pre-stored NE Certificate

Message to dedicated iOMS with (temporary) NE identification -> dedicated

iOMS finds BTS from preconfigured (by planner) BTS ID mapping table

-> response to NE including the final iOMS IP@, final BTS ID and

LTE technology selection and version (otherwise BTS would think it is WCDMA BTS)

New

BTS

Configurator

BTS is connected &

ready for configuring

LTE BTS Auto Connection

final

iOMS

NetAct topology upload

Establish connection to final iOMS

Create BTS

conf plan

Activate BTS auto identification

(ID mapping & technology selection)

MRBTS & LNBTS

objs created

BTS ID mapping

is configured Precondition

DHCP is

configured Precondition

security is

configured

NetAct topology

updated e.g. BTS

IP@ and mediator

information


LTE BTS Auto Connection Workflow


BTS BTS BTS

SW

Manager Configurator Optimizer xxx

NetAct topology

Auto configuration

workflow

NetAct

SW-Download & activation SW-Download Sequence

New BTS conf plan

download & activation

BTS configuration file (RNW, SC, TRS) download and activation

new

BTS

Auto configuration request (param value CCN)

Auto triggering+

license check

Surrounding BTSs plan

dwnld + activation

LTE BTS Auto Configuration (AC)

Restart

Restart

BTS is connected &

ready for configuring

BTS configured

& on air/not on air

E-mail

Topology upload

Establish connection to final iOMS

BTS

conf plan

exists

Optimizer

request/response

- PCI allocation

- Planning

adjacency relations

Upload commissioned new BTS configuration

Download & activation to surrounding operat. BTSs

Configuration upload

SW package

for loading

exists

Restart / online

BTSs configured

for new BTS

E-mail

final

iOMS

Plan actual compare


NetAct Tools and Preparation


NetAct Configuration Management Tools

CM Operations Manager includes the Workflow Engine, which streamlines the eNB integration process and will combine CM Editor, Optimizer, and CM Analyzer steps into a single interface.


Preparation for SON Plug and Play

Plan files must be imported or created that contain the eNB ID and parameters.

If using Optimizer and / or GPS based auto identification then a SITE object must be created in Optimizer which contains geographical data (latitude, longitude, height) and the SITE object must be associated with the eNB object.

Define eNB AC functionality (Auto configuration Settings).

• Set the polling period (how often NetAct looks for sites available to perform AC.

• Specify email address for AC notification emails

• Enable / disable Optimizer usage for AC

• Enable / disable GPS auto identification and specify GPS tolerance.

Define dedicated iOMS. This is the iOMS responsible for identifying new eNBs when connected, the final iOMS may be the same, or different, server.


Auto Configuration Settings


Auto Configuration Settings

Auto plan PCI and eNB relations is to activate ANR feature using Optimizer

If GPS based eNB ID is enabled, the GPS coordinates will be used to determine the identity of new eNBs during auto connection.

Plan clean up is related to the temporary objects created when plans are loaded into the configuration editor prior to eNB connection to NetAct.


Dedicated iOMS

iOMS role is configured via CM Editor tool, after iOMS is integrated to NetAct.

Dedicated iOMS will contain PREBTS objects which identify and map the new eNB based on HW ID, GPS, or Site ID to the final eNB (MRBTS) object.


LTE Workflow Engine

It is recommended to use the same plan for all eNB. This allows Optimizer to

“see” all eNBs when determining potential neighbor sites.


Example Plan File


CM Operations Manager

Launch Workflow Engine

Show history of operations

executed by Workflow Engine


CM Editor

Create or make changes to existing plans

Show and edit actual configuration of network elements once connected and configured


Auto Configuration Report

Check status of eNB auto configuration

Sort by heading or filter by managed object name

If email address is configured in settings email will be sent when status changes.


BTS Site Manager Plug and Play Interfaces

• If site ID is not found or process fails,

local user can manually enter auto

connection site ID.

• HW ID (serial number) and GPS

coordinates are other options to identify

the new site.

This is the status window seen from

BTS Site Manager

09_01_RA41129EN05GLA0_Self Optimizing Networks - SON

Documents

Transcript of 09_01_RA41129EN05GLA0_Self Optimizing Networks - SON