09_01_RA41129EN05GLA0_Self Optimizing Networks - SON

March 14, 2018 | Author: Néstor Pérez | Category: Lte (Telecommunication), Computer Network, Nokia, Automation, Telecommunications Engineering
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LTE Self Organizing Network (SON) RL40


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LTE SON Overview LTE SON Plug and Play Process NetAct Tools and Preparation


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LTE SON has key operational benefits Healing


• Error self-detection and mitigation • Reduced operator effort • Faster maintenance • Reduced outage time

• Simplified installation procedures - less prone to errors • Faster roll-out • Fewer drive-tests • More flexibility in logistics (no site specifics) • Reduced site planning





Optimization • Error self-detection and mitigation • Reduced operator effort • Faster maintenance • Reduced outage time


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SON Tools …


Network Planning tools Engineering Planning tools

Network Operations


Centralized SON

SON Workflow Coordinator



Network Data

Multi-vendor Data

Monitor & Reporter

SON Data

SW Manager


Distributed SON


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Vendor X RA41129EN05GLA0

Vendor Y

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) Mobility Robustness (LTE533)

Automated Neighbor Relation (many related features)


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Automated Neighbor Relations (ANR) in LTE • 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

The steps of ANR process • Neighbor cell discovery

• Neighbor Site’s X2 transport configuration discovery • X2 Connection Set-up with neighbor cell configuration update


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Summary of ANR Features by Release


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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/IPaddress 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 IPconnectivity information ([email protected]) 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.


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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. 10

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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.


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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.


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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


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SON Automation and Optimization Mobility Robustness (LTE755) • 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


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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.


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LTE SON Plug and Play Auto connection and Auto configuration Overview


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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


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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


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BTS Installation process with SON Plug and Play

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

NetAct (NE planning data) SW update

Transport parameters probing

1.Planning process

- IP address from DHCP

Wait auto conf to start

2. Auto Connection Physical site/BTS

Security Authentication


VPN establishment

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3. Auto Configuration Site acceptance testing Site “on-The-Air”

Power On/ Self Test


“Site yyy Configuration parameters downloaded”


Auto Connection & Auto Configuration Features (optional) Auto connection


Auto configuration

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.

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

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

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

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).

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

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.

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.

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LTE BTS Auto Connection Configurator

NetAct dedicated iOMS New BTS


Manual Site site Manual Installation Installation& self self tests tests (POST) (POST)

Establish Ethernet Connectivity

security server


Create BTS conf plan Activate BTS auto identification (ID mapping & technology selection) BTS ID mapping is configured

Precondition DHCP is configured Precondition security is configured

DHCP: BTS [email protected] & vendor specific parameters security server [email protected], dedicated iOMS [email protected]

final iOMS

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 [email protected], final BTS ID and LTE technology selection and version (otherwise BTS would think it is WCDMA BTS) Establish connection to final iOMS MRBTS & LNBTS objs created

BTS is connected & ready for configuring

NetAct topology upload


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NetAct topology updated e.g. BTS [email protected] and mediator information

LTE BTS Auto Connection Workflow


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LTE BTS Auto Configuration (AC) new BTS


final iOMS

NetAct topology

SW package for loading exists SW Manager

BTS conf plan exists Configurator


Auto configuration workflow


Establish connection to final iOMS BTS is connected & ready for configuring

Topology upload Auto triggering+

Auto configuration request (param value CCN)

license check


- PCI allocation Optimizer - Planning request/response adjacency relations

SW-Download & activation

SW-Download Sequence


BTSBTS BTS New BTS conf plan download & activation

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

BTS configured & on air/not on air

Download & activation to surrounding operat. BTSs

Surrounding BTSs plan dwnld + activation

Restart / online

BTSs configured for new BTS

Configuration upload

Upload commissioned new BTS configuration Plan actual compare 23

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NetAct Tools and Preparation


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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.


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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.


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Auto Configuration Settings


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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.


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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.


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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. 30

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Example Plan File


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CM Operations Manager Launch Workflow Engine

Show history of operations executed by Workflow Engine


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CM Editor

Create or make changes to existing plans Show and edit actual configuration of network elements once connected and configured 33

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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.


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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


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