day2 ran 1440 uu load estimator

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Uu Load Control

WCDMA

Patrik Karlsson, Ericsson AB

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Outline

› Technical background

› Field test results

› Summary

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UL RoT and Load Background

› UL Rise o Terminal (RoT) - Exponential increase to load

Load (#users, Mbps)

RoT

› At high load, a small capacity increase result in a large RoT increase

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UL RoT and coverage Background

› UL RoT impact cell coverage

› To secure cell coverage and system KPIs RoT need to be limited

– Inter-cell mobility, Speech retainability, Accessibility, UE battery

–Optimal RoT depends on cellplan

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WCDMA system aspects Background

› Before W12, System experience EUL throughput starvation with a RoT above

eulMaxRoTCoverage!

– A high eulMaxRotCoverage is very beneficial

– Still the situation if not using DUW/DUS RBS HW i.e. RAX!

› Since W12 the system guarantees good EUL throughput also during high RoT

i.e. above eulMaxRoTCoverage

Time

RoT

Mbps

Time

RoT

Mbps

W12

eulMaxRoTCoverage

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Conclusion Technical Background

› High RoT can give higher Mbps

› High RoT risk to degrade system retainability and accessibility

› To minimize per cell tuning one eulMaxRoTCoverage setting is preferred

› Since W12 Ericsson think it can provide good system throughput without using

a very high eulMaxRoTCoverage setting and thereby also securing retainability

and accessibility!

› Low incentive to use a high eulMaxOwnUuLoad threshold setting

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Field tests

eulMaxRoTCoverage FCC

TC0 10 Off

TC1 10 On

TC2 10 On

TC3 15 On

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Cluster U_PWR_UL_ROT_LOAD_dB ROT_LOAD improve on peak hours after each TC, lower values after TC2

Significant better control of ROT 7-8 dB lower noise rise.

TC0: NB Baseline reference

TC1: FCC Activation

TC2: FCC parameter adjustments + IGR

TC3: eulMaxRotCoverage=150

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THroughput

eulMaxRoTCoverage FCC Mbps DL Mbps UL

TC0 10 Off ~500 ~41

TC1 10 On

TC2 10 On ~520 ~47

TC3 15 On ~565 ~52

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07:30 07:45 08:00 08:15 08:300

50

100

150UeRc=25 drops IubLink: 22012 Sector: S2 T-Gamla Stan

time since midnight

cum

sum

of d

rops

2014-04-10 tc0

2014-05-09 tc1

2014-05-28 tc2

2014-06-10 tc3

Cumsum drops eul/hs from gpeh

07:30-08:30

TC0: NB Baseline reference

TC1: FCC Activation

TC2: FCC parameter adjustments + IGR

TC3: eulMaxRotCoverage=150

7-8 dB RoT difference

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› High RoT can result in higher throughput, but it can be expensive from a

coverage (retainability, accessibility) perspective

› WCDMA has since W12 significantly improved its capability to provide good

throughput also with a limited RoT

› To minimize per cell tuning Ericsson recommend a eulMAxRoTCoverage

setting ~12dB to provide both good system throughput and system retainability

– And always limit ownUuLoad to ~10dB

Summary

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day2 ran 1440 uu load estimator

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