9958 wta overview

1 © Nokia 2016 1 © Nokia 2016

9958 Wireless Trace Analyzer (WTA)

Nokia Internal Use

• Chetan Tanna

• 23-March-2016

2 © Nokia 2016

Overview

Product Support

Roadmap

Reference Material

Nokia Internal Use

AGENDA

3 © Nokia 2016 Nokia Internal Use

WTA Overview

Wireless Trace Analyzer (WTA) is a tool that provides end to end call trace view and enables optimization, analysis and troubleshooting LTE*, Small Cell, WCDMA, IMS, CDMA and EVDO networks.

Traces the entire call signaling messages from inception to completion on Nokia Network Elements

Decodes 3GPP protocol and Network Element proprietary messages

Correlates call trace data between Network Elements

* interactive call trace activation and automated call trace data collection supported in real time


(fALU) LTE Call Trace Flow

S-GW P-GW

MME

eNB

S1

Metro

TCE

Call traces, MDT RF Trace (UPOS messages)

9958 WTA

Call Trace, MDT RF Trace

Centralized Call trace Initiation and Analysis

Call traces (MME, S-GW, P-GW)

Statistics /Metrics

Events

Messages

5 © Nokia 2016

WTA Software License is managed by License Key Delivery Infrastructure (LKDI)

New User needs to Activate the WTA Software for the first time

PC needs to have internet connectivity

License are valid for each major release of WTA (e.g. 10.x license are valid for 10.1 and 10.3 release)

A new upgrade license is needed for upgrade to new major release of WTA (e.g. to upgrade from 10.x to 11.x release)

WTA 10.x aligns with LR14.x, WTA 11.x aligns with LR15.x.

Floating License is per PC/user. License can be returned, so it can re-used by another PC/user

Separate License is needed for each Technology (i.e. LTE, WCDMA, etc.)

Nokia Internal Use

License Information (PC Client User)

6 © Nokia 2016

License is managed by Proprietary WTA Software

Manual License file is provided specific for the Citrix Server

License are valid for each major release of WTA (e.g. 10.x license are valid for 10.1 and 10.3 release)

A new upgrade license is needed for upgrade to new major release of WTA (e.g. to upgrade from 10.x to 11.x release)

WTA 10.x aligns with LR14.x, WTA 11.x aligns with LR15.x.

Separate License is needed for each Technology (i.e. LTE, WCDMA, etc.)

Nokia Internal Use

License Information (Citrix Server)

7 © Nokia 2016

eDAT is an internal tool that supports both Drive Test (i.e UE logs) and Call Trace data files

WTA is an external tool (sold to customers) that only supports Call Trace data files

WTA call trace source code is ported into eDAT

Software development is common for both eDAT and WTA and is supported by DE Services R&D organization (led by Mustaquiem Kazi located in Bangalore)

Funding is provided by Product organization - Dominique Morice (MN, LTE-A BBP OAM)

Nokia Internal Use

eDAT vs WTA

8 © Nokia 2016

WTA intranet site for internal users with GA release, pre-release information, feature descriptions, release notes, license info, WTA user guide etc.

https://alu.tl/wta

WTA OLCS site for customers to download GA release, release notes

https://support.alcatel-lucent.com/products/9958-WTA

WTA Development SharePoint site https://alu.tl/wtasp

Engage – ask, discuss, answer and share https://alu.tl/wta-engage

Internal Users report problems via https://alu.tl/NavigatorHelpDesk

Nokia Internal Use

WTA Information

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wta

https://alu.tl/wtasp

https://alu.tl/wta

https://alu.tl/wta-engage



https://alu.tl/NavigatorHelpDesk

https://alu.tl/wta

9 © Nokia 2016

Overview

Product Support

Roadmap

Reference Material

Nokia Internal Use

AGENDA

10 © Nokia 2016

WTA aligns with LTE, WCDMA, Small Cell Product Release enhancements

WTA also supports customer requested enhancements

Product Manager : Philippe Picquet / Michel Chevanne (MN, LTE-A GPM)

Program Manager : Dominique Morice (MN, LTE-A BBP OAM)

Nokia Internal Use

Product Support

11 © Nokia 2016

WTA 11.3.x

LTE Release : eNodeB 15.1L, MME WM9.x, SAM 13.0Rx, SGW 7.0Rx, TCE 7.2

WCDMA Release : LR15.3W

Small Cell Release : LR15.1SC

WTA 10.3.x / 10.1.x

LTE Release : eNodeB 14.xL, MME WM8.x, SAM 12.0Rx, SGW 6.0Rx, TCE 3.3


Small Cell Release : LR14.SCM

WTA 9.3.x / 9.1.x

LTE Release : eNodeB 13.xL, MME WM7.x, SAM 11.0Rx, SGW 5.0Rx


Small Cell Release : BCR4.3

Nokia Internal Use

Current Supported Releases


Customer Support

Tier 3 Support (GPS)

AR

Tier 4 (WTA Team) WG = Navigator Global Support

AR

Tier 1 Support

(Welcome Center)

AR

WTA user

Tier 2 Support (RTS)

13 © Nokia 2016

Verizon

AT&T

SHENTEL

SPRINT-NEXTEL

Orange

AM WIRELESS URUGUAY S.A.

ANTEL PROVEEDOR 41510

Etisalat Sri Lanka

GLOBE TELECOM INC

ICE NORGE AS

LG-Ericsson R&D

LGS INNOVATIONS LLC

TELECOM MOBILE LIMITED

Confidential

WTA customers

TELEFONICA MOVILES

TELUS

CHINA MOBILE

CHINA UNICOM

CORPORACION NACIONAL DE (CNT)

FASTLINK TELECOM

CACTTUS

14 © Nokia 2016

Overview

Product Support

Roadmap

Reference Material

Nokia Internal Use

AGENDA

15 © Nokia 2016

Aligns with Releases : eNodeB 16.1L, MME WM10.x, SAM 14.0Rx, SGW 8.0Rx, TCE 8.1

Support for LR16.1L enhancements

New eNodeB Immediate Minimization of Drive Tests (MDT*) feature - Radio measurements and GPS position is reported by the UE through L3 messages in call trace files (* needs TCE Advance License)

Verizon SANE Support

VoLTE Analysis Enhancements

Trace Collection Entity (TCE) Enhancements – RF Trace updates

Nokia Internal Use

WTA 12.1 Release Features (June 2016)

16 © Nokia 2016

Aligns with Releases : eNodeB 16.2L, MME WM10.x, SAM 14.0Rx, SGW 8.0Rx, TCE 8.2

Support for LR16.2L enhancements

Nokia FSM (BBU – eNodeB) cell trace post processing (interface to L3DC)

Dedicated License for Windows Server & Support

Additional VoLTE Analysis Statistics and Reports

Trace Collection Entity (TCE) Enhancements

Nokia Internal Use

WTA 12.2 Release Features (Oct 2016)

17 © Nokia 2016

Overview

Product Support

Roadmap

Reference Material

Nokia Internal Use

AGENDA


Value Proposition

Faster trouble-shooting

Enables significant time savings, thanks to a centralized execution of trace activation, data collection, retrieval, post-processing and pre-defined reports

Easier operations

Simplifies introduction of new network elements, software releases, user devices or features by helping to identify network issues rapidly

Reduced CapEx Lowers the reliance on network analyzers or probes, which are expensive to purchase and to operate as they need to be installed on several network interfaces


9958 WTA – LTE Architecture

eNodeB(metro)

Devices LTE

Radio Access Delivery Excellence

Tools Evolved

Packet Core

eNodeB

eNodeB

SGW

MME

PGW SAM

9958 WTA

Initiate CT

Retrieve CT Data

Analysis & presentation

TCE

Use Cases

Initiate call trace from WTA , automatically download and post process files in near real time

For an active call trace, multiple users can subscribe to TCE to receive data in near real time

For historical call trace files on TCE, search and download data for analysis


WTA - LTE Call Trace Architecture

5620 SAM / TCE (eNodeB, MME )

7750 SR - SGW

5780 DSC - PCRF

9471 MME

eNodeB

PDN

8650 SDM - HSS

9958 WTA

UE 7750 SR - PGW

User

Control

CT

Use Cases

1. Initiate Call Trace, automatically download and post process/analyze Call Trace files in real time

2. Download and post process/analyze Call Trace files located on NEs or locally on your machine

Statistics /Metrics

Events

Message


Call Trace Initiation (eNodeB)


Call Trace Initiation (MME)


Call Trace Initiation (SGW)


Call Trace Initiation (PGW)


Message Flow view

Call Sequence Diagram displays call sequence in ladder form between different network elements

zoom into an individual message

User configurable coloring

Event: track key state change

Summary view

Detail/Decoded view


Message Explorer view

Same information as Message Flow view - in tabular format, allows filtering per column

Additional Info : Key data on each message extracted

zoom into an individual message

Summary view

Detail/Decoded view


Manage Files – Post Process Historical Call Trace files

Various filter criteria provided to search legacy call traces residing on TCE


Other Views Supported

Analyzed

metrics

available in

grid, scatter,

histogram,

etc.

Various Statistics

calculated based on

captured data

Search,

Filtering,

Bookmarking

capabilities

Pre-Define and

Custom define

report capability

Connect to

remote NEs

to download

CT files

29 © Nokia 2016

eNodeB (Management based)

Cell Traffic trace

Event based trace

RF Trace

Minimization of Drive Test (MDT) Trace

MME

Management based trace (IMSI or ALL UEs)

Signaling trace (IMSI)

IMSI is traced on MME and eNodeB

SGW and PGW

IMSI based trace

Nokia Internal Use

Call Trace Types Supported


Interfaces / Protocols Supported

Interface NEs Protocol

Uu UE – eNB RRC

S1-MME eNB – MME S1AP, NAS

X2 eNB – eNB X2AP

eNB (File Format : XML) MME (File Format: PCAP)


S1-MME MME - eNB S1AP, NAS

S3 MME – SGSN GTPv2-C

S10 MME – MME GTPv2-C

S11 MME – SGW GTPv2-C

Sv MME - MSC GTPv2-C

S6a MME – HSS Diameter

S13 MME – EIR Diameter

SLg MME – GMLC Diameter

Gn MME – SGSN GTP

SGs MME – MSC SGSAP

SLs MME – MSC LCSAP


Interfaces / Protocols Supported

SGW (File Format : Text) PGW (Debug log file format : Text)


S5 / S8 SGW - PGW GTPv2-C

S11 SGW - MME GTPv2-C

Ga SGW - CGF Diameter


S5 / S8 PGW - SGW GTPv2-C

Gx PGW - PCRF Diameter

Ga * PGW - CGF GTP Prime

Gn * PGW - SGSN GTP

Gy * PGW - OCS Diameter

Rf * PGW - OFCS Diameter

* Activation only


Statistics Explorer

Allows to Plot message flow per call-id Call Trace Summary displays list

of individual calls

Handover statistics reports available


Statistics Explorer – VoLTE

Allows to Plot message flow per call-id

VoLTE Call Drop lists drop calls

VoLTE Call Summary lists all calls

34 © Nokia 2016

Call trace is a 3GPP compliant tracing mechanism

- Scalability & interworking with probe was not a key requirement in the 3GPP design (TS 32.422/423)

- Focus only on L3

RF Trace is a new tracing mechanism in eNodeB

- It does not attempt to follow strictly 3GPP specification but rather to provide an efficient & scalable tracing mechanism

- L3 tracing redesigned to add important data not required by TS 32.322/323 and to remove redundancy with probe

- Key metrics from L1/L2 are reported

- Some user plane metrics are reported

RF Trace can be run simultaneously with call trace

RF Trace Support

35 © Nokia 2016

Measurements

L1 (DSP)

RSSI

L2 (DLT)

Rank

Scheduled PRB

L2 (ULT)

Power Head Room

Pusch_sinr

Tadv_type2

LCG/BSR

Scheduled PRB

RF Trace Measurements

36 © Nokia 2016

1

eNodeB - RF Trace Initiation

Message Flow

a new tracing mechanism (needs TCE Advance license) L1 data - RSSI L2 data - PHR, SINR, AoA, PRB, etc. L3 data - RRC, X2

Nokia Internal Use

37 © Nokia 2016

Logged MDT is a new eNodeB feature (in LR15.1L) analysis of idle mode measurement. UE provides a log of radio measurement & GPS position.

E2E view (call trace + logged MDT), showing the complete behavior of the UE

WTA shows detailed view

WTA correlates call trace MDT data for detailed study

Nokia Internal Use

Analysis of MDT (Minimization of Drive test)


Support for Logged mode MDT (Minimization of Drive Tests) - needs TCE Advance license

E2E view of MDT related messaging in the network through Message Explorer and Message Flow views.

Supports initiation of MDT traces in the following configurations:

MDT with eNB Call Trace

MDT with eNB Call Trace and RF Trace

MDT Initiation WTA support for eNodeB – Logged MDT Initiation


eNodeB – Logged MDT Display

Metric Name: RSRP of Serving Cell ID MDT


VOLTE – IMS Supported (prototype)

Post processing and analysis of SIP messages from PCAP call traces collected by IMS network elements

Detailed/Decoded View

Summary View

41 © Nokia 2016

Generate the list of messages supported from Tools menu

Allows users to modify default setting from Tools menu

Nokia Internal Use

List of Messages Supported


Benefits

Allows export of data in multiple formats

Trace activation performed from the Wireless Trace Analyzer versus having to perform traces from different systems or elements and locations, requiring additional coordination

Various views supported - Message Flow, Message Explorer views, Metrics Statistics, Reports

Traces the entire call signaling from inception to completion on ALU network elements (includes air interface)

End to End troubleshooting of call trace data for multiple protocol layers. Includes decoding of Nokia proprietary messaging and 3GPP/3GPP2.

Interactive call trace activation & automated call trace data collection from network elements

WTA

Benefits

Enables operators to address the challenge of diagnosing and troubleshooting complex issues via call trace data

No costly probes needed !

43 © Nokia 2016

The 9958 WTA efficiently addresses common problems such as identifying the reasons for subscriber authentication failures, and very complex ones requiring detailed protocol layers message decoding.

The 9958 WTA is also extremely helpful for troubleshooting the behavior of new devices, or for performing in-depth analysis of call traces following a subscriber complaint. As it can combine trace analysis from multiple network elements, complex correlation of traditional probe-based traces is avoided.

Introduction of a new network element, software release, or telecom feature may bring new problems that can only be identified with an end-to-end visibility of the exchanges over the different network interfaces.

Handover execution in a wireless network is a critical part of a call, and can in many cases result in call drops or low Quality of Experience (QoE) perception. Detailed analysis of the handover preparation is essential to understanding the reasons behind the poor performance. WTA offers an efficient way to verify successful handoffs from one technology to another as well as analyzing failure causes.

Nokia Internal Use

Use Cases

44 © Nokia 2016

eNodeB, MME Near Real Time Call Trace (NRTCT) is supported with SAM/TCE configuration

After initiating call trace, WTA subscribes with TCE to receive call trace data in near real time

“CT Status” tab displays information about the Call Trace Initiation

“CT Data Status” tab displays information about subscription with TCE

Message Flow and Message Explorer views are auto populated with data received from TCE

Nokia Internal Use

Near Real Time Call Trace (NRTCT) – TCE


Near Real Time Call Trace (NRTCT) – WTA GUI

Initiate eNodeB or MME Call Trace

After successful Call Trace Initiation - CT Status tab display status of CT

After successful Call Trace Initiation - CT Data Status tab displays status of Subscription Session with TCE

46 © Nokia 2016

With SAM/TCE configuration, multiple users can subscribe to receive ‘active’ call trace data for eNodeB or MME.

Example:

User #1 initiates call trace on eNodeB #1

Other users can now subscribe to receive call trace data for eNodeB #1 in near real time.

‘CT Data Status tab’ displays information about subscription with TCE

Message Flow and Message Explorer views are populated with data received from TCE

Nokia Internal Use

Call Trace Subscription with TCE

47 © Nokia 2016

User can subscribe to active TCE session or active call trace initiated from SAM GUI

Nokia Internal Use

Call Trace Subscription with TCE

48 © Nokia 2016

Traffic Threshold - Number of Connected UE ratio for the monitored eNB cell

• eNB monitors # of RRC connected UEs in 1min sampling interval

• At the end of 1min interval, eNB calculates the connected UE percentage for each monitored cell and compares with the configured threshold value.

• If the calculated value is lower than the configured value, eNB start collecting the trace data whenever a UE starts a call on the traced cell.

RRC Connection Re-establishment Threshold - number of RRC Connection Re-establishment attempts eNB received from UEs for the monitored cell

• eNB monitors # of RrcConnectionReestablishmentRequest received based on 1 min sampling interval

• At the end of 1min interval, eNB compares the value of # of RrcConnectionReestablishmentRequest received, with the configured value.

• If value for # of RrcConnectionReestablishmentRequest received is greater than the configured value then eNB start collecting trace data whenever a UE starts a call on the traced cell.

IRAT Handover Threshold - number of outgoing Inter-RAT Handover Redirection Attempts eNB sent to UEs for the monitored cell

• eNB calculates the number of IRAT HO redirection 1min sample

• eNB Compare it with the configured iratHOThreshold value for each monitored cell.

• If the calculated value is greater than the iratHOThreshold value, then eNB start collecting trace data whenever a UE starts a call in the traced cell.

Nokia Internal Use

eNodeB Event Based Trace – Threshold parameters


9958 WTA – WCDMA Architecture

Statistics /Metrics

Events

Message

9353 WMS

WTA

RNC

Call trace data are generated by the network elements

WTA retrieves call trace data via WMS

Post-processing & analysis are done on user’s PC

50 © Nokia 2016

Supports call trace data captured by WCDMA RAN

Includes CTg, CTa, CTb, CTN, CFT, OT: Cell, IuCS, IuPS, IuR, IuBC

End-to-End analysis of calls per 3GPP Specs

Protocols: RRC, NBAP, RANAP, RNSAP

Interfaces: Uu, IuB, IuR, IuPS, IuCS, IuBC

Nokia Internal Use

WCDMA Technologies Supported

51 © Nokia 2016

9958 WTA

9958 WTA retrieves the 3GPP standard XML Call Trace Files from Small Cell Management System (SCMS) for the following three Network Elements:

• Small Cell, Small Cell Gateway (SCGW) and Iu Protocol Converter (IPC)

9958 WTA – Small Cell Overview

52 © Nokia 2016

MGW 9370 RNC SGSN GGSN

3G-MSC/VLR

NodeB GMSC

PSTN PDN

9353 WMS

9958 WTA

Iu-Ps

Iu-Cs

Gn/Gp

HSS/EIR Gr Gc

lsup

Gi Uu IuB

SCMS

IuH

IPC

Iu-Ps

Iu-Cs SCGW

SC

Uu Iu-Cs

Iu-Ps

User

Control

CT

Use Case

Download and post process/analyze Call Trace files located on NEs (SCMS or WMS) or locally on your machine

9958 WTA – WCDMA/Small Cell Architecture

53 © Nokia 2016

Small Cell (aka Femto)

Supports Small Cell, Small Cell Gateway (SCGW) and IP Protocol Converter (IPC) Call Trace files

Supports Small Cell RF Trace files

Interface (Protocols) supported are:

• Small Cell : Uu (RRC), Iu (RANAP)

Nokia Internal Use

9958 WTA – WCDMA/Small Cell Architecture (Contd.)


WTA Client Hardware/Software Requirements

Component Minimum Recommended Supported

CPU Core2 Duo Core i5

Corei7

Same as OS support

RAM 2GB 4GB+ 2GB+

OS Windows 7 Windows 7 Windows 8

Server 2003/2008/2012

plus 64 bit editions of each

Hard Drive 10GB Free + Data Space 5400 RPM

100GB Free + Data Space 7200 RPM

Same as OS support

Display

Resolution

1024x768 1600x1200 Same as OS support

Other SW .NET Framework 4.5 .NET Framework 4.5 .NET Framework 4.

56 © Nokia 2016

WTA Software can be downloaded from OLCS website or WTA Verizon collaboration or FSA site for Verizon

Launch WTA Software

Click Start

Click All Programs

Click Nokia

Click 9958 WTA

Click 9958 WTA again

Nokia Internal Use

WTA Software Installation

9958 wta overview

Documents