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A New Test Methodology For

Troubleshooting RF Interference/Noise in 3G and 4G/LTE

Radio Access Networks

This presentation contains Proprietary Information. Not intended for public distribution

Our Bold Claim

This new methodology can save telecom operators MILLIONS of dollars per year

spent on Interference Debugging by: • Reducing truck rolls and/or tower climbs

• Cutting in half the time to interference resolution on live Radio Access Networks (RANs)

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About Absolute Analysis

• Mission: Tools To Validate Serial Communications

• We help customers test high speed communications in: Telecommunications

Avionics & Defense

Data communications

Semiconductor

• Headquarters in Newbury Park, California

• “We never miss a bit”

This presentation contains Proprietary Information. Not intended for public distribution

This presentation contains Proprietary Information. Not intended for public distribution

The Business of PREVENTION and RECOVERY

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The Interference Problem

• A million person area • 1000 licensed two way

radios, 600 cell sites, and 100 broadcasters.

• Add military, aeronautical, and emergency services.

• Add unlicensed Wi-Fi, microphones, cameras, etc.

• Unlimited amount of reflections due geographic characteristics and evolving landscape of buildings

Typcial Metro Area Population 1 Million

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The Interference Problem + The 4G RAN Evolution

• In 2G networks, the RRH and BBU were co-located in the hut.

• Troubleshooting RF Interference was easy

BBU

RRH

RF Signal

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The Interference Problem + The 4G RAN Evolution

• Beginning with 3G and now 4G networks, the RRH and BBU are separate

• The connection link down the tower is now digital (CPRI or OBSAI link)

• Troubleshooting now requires a “tower climb”

BBU

RRH

Digital RF Signal (CPRI or OBSAI)

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Problem with Measuring RF at the Top of the Tower

• Cost – Often Thousands of Dollars

per truck roll!

• Access Not Immediate – Private Property? Permits?

• Accuracy – Direct connection to RF often

not possible – Almost impossible to

measure the same radio horizon as the antenna

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The Solution: The Digital Link

• CPRI or OBSAI

• Digital Link carries:

– Control plane data for BBU/RRH commands

– User Plane data: RF Data in the form of IQ

• Available at the bottom of the tower

BBU

RRH

Digital RF Signal (CPRI or OBSAI)

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The Benefits

• Lower cost – Eliminate tower climbs

– Eliminate truck rolls

• Easier, Faster Access – No permits or

permission

• Faster time to solution – Better accuracy

– Collaboration

BBU

RRH

Digital RF Signal (CPRI or OBSAI)

Integris

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Introducing Integris

• Provides RF Spectrum Analysis Directly from the CPRI or OBSAI link

• Extracts the RF data in the form of IQ

• Displays the data just like a Spectrum Analyzer

• Captures data for further offline analysis and archiving

• Supports up to 6.144 Gbps Integris

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Integris Use Model

• Cell tower antenna experiences too much interference

• Field engineer takes Integris, and plugs into CPRI or OBSAI link

• RF can be monitored until noise is found

• Field engineer can now do drive test without having to ever climb up the tower

Integris

Remote Radio Head

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Faster Problem Resolution via Collaboration

Integris

Internet

Collaboration with RF Experts

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Collaboration on Analysis

• Recording of RF Data allows offline analysis

• Files can be sent to RF experts

• Export of MATLAB V5 format

• Use Signal Analysis software tools like MATLAB (Mathworks) or SignalVu (Tektronix) Matlab Screen Shots

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Beyond RF – Visibility into Network

• Real-Time Monitoring of Link Status

• Loss of Frame Alarm (LOF)

• Losss of Sync Alarm (LOS)

• Remote Alarm Indication (RAI)

• Serial Digital Interface Alarm (SDI)

• BFN/HFN Synchronization

• Performance Monitoring

• Round trip delay (latency)

• Bit Error Rate

• Failover/Recovery

• Service Disruption

• Link Power

• Visibility of each user plane

• Control Plane data

• User plane data

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Integris New Testing Paradigm

• Digital RF provides unparalleled accuracy

• RF Extraction at the bottom of the tower

• Remote control via internet

• Collaboration tools for faster problem resolution

• Use software analysis to help search for the noise source

Integris

Remote Radio Head

This presentation contains Proprietary Information. Not intended for public distribution

This presentation contains Proprietary Information. Not intended for public distribution

Who Uses Absolute Analysis?

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Integris SUMMARY

• Connects Directly into the CPRI or OBSAI link

• Extracts the RF data in the form of IQ

• Displays the data just like a Spectrum Analyzer

• Captures data for further offline analysis and archiving

• Supports up to 6.144 Gbps Integris

This presentation contains Proprietary Information. Not intended for public distribution

China Local Distributor

• Flash Technology (HK) Limited

• Flash Technology Trading (SH) Limited Tel: 8621-61457130-312 Fax: 8621-61457131 Email : sherman@flashtech.com.cn