Transcript NetHawk Introduction

Confidential
NetHawk Quality of Service products
Markus Ahokangas, MSc
Product Manager
Business Id. 0631056-0
© NetHawk 2002. All rights reserved.
April 2005
NetHawk
Confidential
Business Id. 0631056-0
© NetHawk 2002. All rights reserved.
April 2005
NetHawk
Confidential
Quality of Service –mittaukset
verkkoanalysaattorilla
> Call and Session Analysis
> Quality of Service (QoS)
> Radio Optimization Measurement
Business Id. 0631056-0
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April 2005
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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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April 2005
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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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April 2005
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Call and Session trace
> Different kinds of Handover (HO) cases in UTRAN
– Soft, Softer, Hard (Intra/Inter frequency) and Intersystem
> 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
Business Id. 0631056-0
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April 2005
NetHawk
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Call and Session trace
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April 2005
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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
Business Id. 0631056-0
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April 2005
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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
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April 2005
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Call and Session trace
Key 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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April 2005
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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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April 2005
NetHawk
Confidential
Quality of Service (QoS)
Business Id. 0631056-0
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April 2005
NetHawk
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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)
Business Id. 0631056-0
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April 2005
NetHawk
Confidential
Quality of Service (QoS)
Business Id. 0631056-0
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April 2005
NetHawk
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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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April 2005
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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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April 2005
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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.
Business Id. 0631056-0
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April 2005
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ROM user interface
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April 2005
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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
Business Id. 0631056-0
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April 2005
NetHawk
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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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April 2005
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The most effective tool for NodeB
> HSDPA functional testing and
demonstrations
> Production testing
> Conformance testing
Business Id. 0631056-0
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April 2005
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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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April 2005
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Test NodeB or UE with BER
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April 2005
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Test HSDPA Layer 1
RNC/Iub Simulator
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WCDMA NodeB
April 2005
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Test mobile
Confidential
Virtual IubTM to develop Test Cases
without NodeB
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NodeB Conformance Testing
RNC/Iub Simulator
10MHz
E1
RF
CMU300
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Iub
WCDMA/FDD NodeB
April 2005
NetHawk
Confidential
> 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
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April 2005
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