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1 © Nokia Siemens Networks RA41129EN05GLA0
LTE Self Organizing Network (SON) RL40
2 © Nokia Siemens Networks RA41129EN05GLA0
Nokia Siemens Networks Academy
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3 © Nokia Siemens Networks RA41129EN05GLA0
Contents
LTE SON Overview
LTE SON Plug and Play Process
NetAct Tools and Preparation
4 © Nokia Siemens Networks RA41129EN05GLA0
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
5 © Nokia Siemens Networks RA41129EN05GLA0
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
6 © Nokia Siemens Networks RA41129EN05GLA0
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)
7 © Nokia Siemens Networks RA41129EN05GLA0
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
8 © Nokia Siemens Networks RA41129EN05GLA0
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/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.
10 © Nokia Siemens Networks RA41129EN05GLA0
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.
11 © Nokia Siemens Networks RA41129EN05GLA0
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.
12 © Nokia Siemens Networks RA41129EN05GLA0
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.
13 © Nokia Siemens Networks RA41129EN05GLA0
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
14 © Nokia Siemens Networks RA41129EN05GLA0
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
15 © Nokia Siemens Networks RA41129EN05GLA0
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.
16 © Nokia Siemens Networks RA41129EN05GLA0
LTE SON Plug and Play Auto connection and Auto configuration Overview
17 © Nokia Siemens Networks RA41129EN05GLA0
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
18 © Nokia Siemens Networks RA41129EN05GLA0
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
19 © Nokia Siemens Networks RA41129EN05GLA0
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”
20 © Nokia Siemens Networks RA41129EN05GLA0
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.
21 © Nokia Siemens Networks RA41129EN05GLA0
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
22 © Nokia Siemens Networks RA41129EN05GLA0
LTE BTS Auto Connection Workflow
23 © Nokia Siemens Networks RA41129EN05GLA0
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
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
final
iOMS
Plan actual compare
24 © Nokia Siemens Networks RA41129EN05GLA0
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.
26 © Nokia Siemens Networks RA41129EN05GLA0
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.
27 © Nokia Siemens Networks RA41129EN05GLA0
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.
29 © Nokia Siemens Networks RA41129EN05GLA0
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.
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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
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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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