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A New Test Methodology For Troubleshooting RF Interference/Noise on Remote Radio Heads

A New Test Methodology For Troubleshooting RF Interference/Noise on Remote Radio Heads. Presented by Absolute Analysis. This new methodology can save telecom operators MILLIONS of dollars per year spent on Interference Debugging by: Reducing truck rolls and/or tower climbs

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A New Test Methodology For Troubleshooting RF Interference/Noise on Remote Radio Heads

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  1. A New Test Methodology For Troubleshooting RF Interference/Noise on Remote Radio Heads Presented by Absolute Analysis

  2. 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 resolve issues on live Radio Access Networks (RANs)

  3. 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”

  4. The Business of PREVENTION and RECOVERY

  5. 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 Typical Metro Area Population 1 Million

  6. The Remote Radio Head Evolution • In 2G networks, the RRH and BBU were co-located in the hut. • Troubleshooting RF Interference was easy RF Signal RRH BBU

  7. The Remote Radio Head Evolution RRH • 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” Digital RF Signal (CPRI or OBSAI) BBU

  8. Problem with Measuring RF at the Top of the Tower • Cost • Approximate cost of $5000/day per truck roll! • Access Not Immediate • Site restrictions? Weather conditions? • Expertise requirements

  9. The Solution: The Digital Link RRH • CPRI or OBSAI • Digital Link carries: • Control and monitoring information between the BBU and RRH • User Plane data: RF Data in the form of IQ • Available at the bottom of the tower Digital RF Signal (CPRI or OBSAI) BBU

  10. The Benefits RRH • Lower cost • Reduced tower climbs • Reduced truck rolls • Easier, Faster Access • Faster time to solution • Better accuracy • Collaboration • Data can be measured remotely • Ability for advanced post processing analysis Digital RF Signal (CPRI or OBSAI) Integris BBU

  11. Introducing Integris Integris Provides RF Spectrum Analysis Directly from the CPRI or OBSAI link Extracts user plane data in the form of IQ samples and converts to RF display Can also capture and decode control and management place data Displays the data just like a Spectrum Analyzer Captures data for further offline analysis, replay and archiving Supports link rates up to 6.144Gbps

  12. IntegrisUse Model Remote Radio Head • Cell tower antenna experiences too much interference • Field technician takes Integris, and plugs into CPRI or OBSAI link • RF can be monitored locally or remotely • Field technician can now do drive test without having to ever climb the tower Integris

  13. Faster Problem Resolution via Collaboration Collaboration with RF Experts Any Ethernet based Network Integris

  14. Collaboration on Analysis • Recording of RF Data allows remote and offline analysis • Files can be sent to RF experts • Export of MATLAB V5 format • Use commercially available Signal Analysis software tools for detailed analysis Matlab Screen Shots

  15. Beyond RF – Visibility into Network Real-Time Monitoring of Link Status • Loss of Frame Alarm (LOF) • Loss of Sync Alarm (LOS) • Remote Alarm Indication (RAI) • Serial Digital Interface Alarm (SDI) • BFN/HFN Synchronization PerformanceMonitoring • Round trip delay (latency) • Bit Error Rate • Failover/Recovery • Service Disruption • Link Power Visibility of each user plane • Control and Management plane data • User plane data

  16. IntegrisNew Testing Paradigm Remote Radio Head • Digital RF provides unparalleled accuracy • RF Extraction at the bottom of the tower • Remote control through a network connection • Collaboration tools for faster problem resolution • Use software analysis to help search for the noise source Integris

  17. Who Uses Absolute Analysis?

  18. Telecom Consulting Services Onsite assistance in network problem debug and resolution Customization to support non-standard CPRI or OBSAI formats Extraction and display of Vendor Specific sub-channel or other CPRI or OBSAI frame information Product and Network Test Training Courses

  19. Section 5 Demo

  20. IntegrisSummary Integris Connects directly into the CPRI or OBSAI link Extracts Control, Monitoring or User Plane data. Displays RF just like a Spectrum Analyzer Can decode Control and Monitoring data Stores data for offline analysis and archiving Supports link speeds up to 6.144Gbps

  21. Section 6 Q&A

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