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NetHawk Quality of Service products

NetHawk Quality of Service products. Markus Ahokangas, MSc Product Manager. Quality of Service –mittaukset verkkoanalysaattorilla. Call and Session Analysis Quality of Service (QoS) Radio Optimization Measurement . Call and Session Analysis. Call and Session establishment failures in

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NetHawk Quality of Service products

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  1. NetHawk Quality of Service products Markus Ahokangas, MSc Product Manager

  2. Quality of Service –mittaukset verkkoanalysaattorilla • Call and Session Analysis • Quality of Service (QoS) • Radio Optimization Measurement

  3. Call and Session Analysis • Call and Session establishment failures in • multi-manufacturer Iu-CS an Iu-PS interfaces • manufacturer specific Iub interface • Calls and Sessions dropping during active phase, why? • Malfunctioning UE • Admisson control in RNC • Handover control in RNC/UE • Power control in RNC/UE

  4. Call and Session trace Dropped CS calls and PS session can be filtered out from huge signalling load to be further analysed

  5. Call and Session trace • Different kinds of Handover (HO) cases in UTRAN • Soft, Softer, Hard (Intra/Inter frequency) and Inter-system • Well working HO control function in RNC must be verified to: • minimize the number of dropped calls • guarantee economical radio resource utilization • avoid ping-pong effects

  6. Call and Session trace

  7. Call and Session trace • NetHawk Iub Call Trace enables to find all the different HO cases • Dynamic Iub feature enables analyser to find the new connections (VPI/VCI/CID) being allocated for CS calls and PS session during HO procedure

  8. Call and Session trace • HO cases are expressed when they happen: • different HO types separated • calls with different active set sizes separated • Failed HO can be opened in monitoring window for detailed analysis

  9. Call and Session traceKey Performance Indicators • Statistical information illustrates the most important parameters affecting the network performance e.g. • Call/session drop rate, • Handover success rates, • Cause distribution, • etc.

  10. Quality of Service (QoS) • Which network elements is a “bottleneck” in PS operation? • How to guarantee satisfying QoS for the subscribers? • Is the network fulfilling QoS requirements defined by 3GPP?

  11. Quality of Service (QoS)

  12. Quality of Service (QoS) • Enables measurements for U-Plane traffic • Delay, average delay, delay variance • Throughput for IP, UDP, TCP (resendings) • Measurement for all traffic in interface or for a single subscriber (co-operation with Call Trace) • Several simultaneous measurements • The results exportable to be further analysed (e.g. with MS-Excel)

  13. Quality of Service (QoS)

  14. WCDMA analysis challenges • In WCDMA UEs are simultaneously on the same frequency band causing: • Cell breathing, • Near-far effect and • Interference. • New parameters and analysis methods are needed for troubleshooting: • Parameter correlation not clearly known yet. • Power control functionality in RNC and UEs need to be tested. • UL/DL parameter merging. • Therefore, how to minimize the number of dropped calls and maximize the cell capacity? • And how to easily access, analyse and visualize the key parameters?

  15. NetHawk solution for radio analysis • The key parameters and indicators for WCDMA air interface quality are available in the Iub interface between NodeB and RNC. • With the NetHawk 3G Analyser these parameters can effectively be monitored, calculated and analysed. NetHawk 3G Analyser

  16. ROM option in the NetHawk 3G Analyser • Radio Optimization Measurement (ROM) is a tool for radio interface optimization and troubleshooting. • ROM provides graphical view to the key UE and cell level parameters. • With the help of view to the signalling levels, error rates and power values within the monitored area, you can investigate: • Radio interface quality, • Interference, • Power control and • DL/UL balancing.

  17. ROM user interface

  18. ROM parameters • Cell related parameters: • Received total wideband power, • Transmitted carrier power. • UE dedicated parameters: • BLER (Block Error rate), BER (Bit Error Rate), FER (Frame Error Rate), • SIR Target, SIR Value, SIR Error Value, • Transmitted code power value, • Round Trip Time

  19. Conclusions • Efficient QoS analysis and troubleshooting with the NetHawk 3G Analyser. • Call trace application enables solving subscriber related problems, HO problems and statistical analysis • QoS application provides illustrative view to throughput and point-to-point delay related parameters in your network. • ROM application provides view to the key radio interface parameters collected from Iub interface.

  20. NetHawk RNC/Iub Simulator The most effective tool for NodeB > HSDPA functional testing and demonstrations > Production testing > Conformance testing

  21. Challenges with UMTS Networks • How to build network for NodeB testing? • How to test HSDPA implementation in the NodeB? • How to verify the NodeB transmitter and receiver characteristics? • How to perform acceptance tests for new mobile phone models • How to demonstrate the new features of the product? • How to minimize the number of faulty NodeBs coming out from the factory?

  22. Test NodeB or UE with BER

  23. Test HSDPA Layer 1 RNC/Iub Simulator Test mobile WCDMA NodeB

  24. Virtual IubTM to develop Test Cases without NodeB

  25. NodeB Conformance Testing RNC/Iub Simulator 10MHz E1 Iub RF CMU300 WCDMA/FDD NodeB

  26. Conclusions • NetHawk RNC/Iub Simulator extends your PC into a telecommunication tester that simulates protocols in Iub interface and points out user plane problems • The solution for functional NodeB testing to reduce effort and to increase quality: • Unique portable RNC • Solution for HSDPA L1 functional testing • NodeB production test platform

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