Business Id. 0631056-0© NetHawk 2002. All rights reserved. Confidential April 2005NetHawk NetHawk...

April 2005 NetHawkBusiness Id. 0631056-0 © NetHawk 2002. All rights reserved.

Confidential

NetHawk Quality of Service products

Markus Ahokangas, MSc

Product Manager


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Quality of Service –mittaukset verkkoanalysaattorilla

> Call and Session Analysis

> Quality of Service (QoS)

> Radio Optimization Measurement


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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


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Call and Session trace

Dropped CS calls and PS session can be filtered out from huge signalling load to be further analysed


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> 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


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> 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



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> 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


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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.


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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?


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> 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)


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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?


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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


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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.


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ROM user interface


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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


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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.


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The most effective tool for NodeB

> HSDPA functional testing and demonstrations

> Production testing

> Conformance testing


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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?


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Test NodeB or UE with BER


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Test HSDPA Layer 1

RNC/Iub Simulator WCDMA NodeB Test mobile


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Virtual IubTM to develop Test Cases without NodeB


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NodeB Conformance Testing

E1

CMU300

IubRF

10MHz

RNC/Iub Simulator

WCDMA/FDD NodeB


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> 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

Business Id. 0631056-0© NetHawk 2002. All rights reserved. Confidential April 2005NetHawk NetHawk...

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