031711 bbnwimaxrangethroughmeas

7/21/2019 031711 BBNWiMAXRangeThroughMeas

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Sponsored by the National Science Foundation 1March 15, 2011

WiMAX Range and Throughput Measurements

Goals

Principal Elements

Process

Path Loss Measurements

Experiment Application Design

Connection Ealuation !teps

"EC !ector Antenna Tilt Range and Throughput Measurements

# Plan

# Results

# !ummar$

Conclusions and "ext !teps

Authors% Manu Gosain& Ton$ Michel& Tom Cahill& 'arr$ Mussman


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Goals

(alidate )ase station installation and con*guration process

# Proide comprehensie documentation

Design an experiment to ealuate range and throughput

# Document +or use )$ other sites in ealuating theirexpected range and throughput

# Later% moe to ,M-.,ML enironment

Ealuate range and throughput at //" site

# Compare to 0no1n calculations& measurements

# Document +or use )$ other sites in estimating theirexpected range and throughput


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Principal Elements

/ase station 0it 2/T!3

# 4tili5ing "EC Pro*le C 6D4 and ,D4

Roo+top antennas

# "EC 789deg sector

# Commercial omnidirectional

Anritsu spectrum anal$5er& +or measuring receied po1er

Linux laptop 1ith 6ntel :8;9 WiMAX modem& acting as a mo)ile station 2M!3

/T! serers& including%

# A!" GW 1ith WiMAX R- AggMgr 2Case 7)3

# Test host

# 6


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Process

73 Conduct po1er measurements using Anritsu spectrum anal$5er

# Chec0 +or presence o+ Clear1ire signal 1ith Anritsu spectrum anal$5er

83 /uild and eri+$ experiment application to conduct range and throughputmeasurements

=3 Decide on )est do1n tilt +or "EC sector antenna

# Estimate +or electrical do1n tilt% ;deg

# ,ptions +or mechanical do1n tilt% 79deg& :deg& >deg& 8deg 2selected >deg3

>3 Conduct range and throughput measurements near //" Technologies

location in Cam)ridge& MA# -ocus on line?o+?sight& outside onl$ 2gies )est case3

# @eep nominal /T! con*guration parameters

Po1er set to =Bd)m& the maximum allo1ed

# ,ptions +or )ase station antenna%

"EC sector )ase station antenna 2at >deg mechanical do1n tilt3

,mni?directional )ase station antenna# ,ptions +or Linux laptop mo)ile station%

6nternal 6ntel :8;9 WiMAX modem& and internal antenna

External 24!/?connected3 :8;9& 1ith handheld omni?directional antenna


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73 Po1er Measurements

Po1er measurements using Anritsu spectrum anal$5er

# Measured 1ith sector antenna& :deg mechanical tilt

# "ear antenna% ?=>d/m

# Point >7& =9+t% ?;d/m 2good signal3

# Point& ;89+t% ?;9d/m 2good signal3

# Point& 779?+t% ?d/m 2edge o+ coerage3

Presence o+ Clear1ire signal 1ith Anritsu spectrum anal$5er

# ,n roo+ 2line o+ sight3% ?:9d/m

# Point >% ?9d/m


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83 Experiment Application Design

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7/24Sponsored by the National Science Foundation >March 15, 2011

Connection Ealuation !teps

!tep 73 (eri+$ WiMAX connection occurs

# !ee tunnel setup +rom /T! log

# Chec0 Do1n Lin0 2DL3 R!!6 at M!

# Chec0 4p Lin0 24L3 R!!6 +rom /T! log

!tep 83 (eri+$ M! get 6P address ia D'CP

# !ometimes +ails i+ 4L is poor

!tep =3 Do a seuence o+ ping tests )et1een M! and Test 'ost argosF

# Ping to argos& 79)$tes& 79 timesH chec0 response 1ithin 7sec1indo1H log dela$s& I responses not 1ithin 1indo1 2lost3

# Ping to argos& 79B)$tes& 79 timesH chec0 response 1ithin 7sec

1indo1H log dela$s& I responses not 1ithin 1indo1 2lost3

# Ping to argos& 799B)$tes& 79 timesH chec0 response 1ithin 7sec1indo1H log dela$s& I responses not 1ithin 1indo1 2lost3


8/24Sponsored by the National Science Foundation ?March 15, 2011

2continued3

!tep >3 Do a seuence o+ iper+ tests )et1een M! and Test 'ostargosF

# Repeat = times

# 4se TCP

# 4se ?d +or dou)le connection& separating DL and 4L measurements

# Throughput in M).s calculated +rom )$tes transmitted 1ithin:9sec interal

# Print throughput in M).s to log

# TCP parameters%

use "agleJs algorithm

1indo1 si5e and segment si5e per ,!% 7:0/

depth read.1rite )uKer in soc0et& de+ault% B0/

max segment si5e% 7>9B/ 2MT4 si5e3 ? >9/ 7=:B/

# 4se o+ TCP gies conseratie result& )ut t$pical o+ man$applications


9/24Sponsored by the National Science Foundation @March 15, 2011

=3 "EC !ector Antenna Tilt

WiMAX antennas t$picall$ hae a )uilt?inelectrical 2do1n3 tilt& and a aria)le

mechanical 2do1n3 tilt Estimate +or electrical tilt on "EC sector

antenna& per specs% ;deg

,ptions tried +or mechanical 2do1n3 tilt%79deg& :deg& >deg& 8deg

# Too much do1n tilt )uriesF the signalsclose to the )ase station& and shortensrange

# Too little tilt creates a )lan0 spot near)ase station

# There is al1a$s a )lan0 spot er$ near the

)ase station 2and 1ithin the )uilding3caused )$ shado1 o+ the )uilding

Chosen +or mechanical tilt% >deg

# Throughput measurements sho1ed rangeat >deg to )e higher than at 8deg or :deg


10/24Sponsored by the National Science Foundation 10March 15, 2011

>3 Measurements Plan

-ocus on line?o+?sight& outside onl$ 2gies )est case3

# Points >7 through >B& in a straight line at center o+ 789deg sector pattern

# ,ptional points 7 through & in orthogonal direction 21ith point o)structed )$)uilding3& to eri+$ expected =:9deg omni coerage

@eep nominal /T! con*guration parameters

# Po1er set to =Bd)m& the maximum allo1ed

,ptions +or )ase station antenna%

# "EC sector )ase station antenna 2at >deg mechanical do1n tilt3& approx 9+t high

# ,mni?directional )ase station antenna& approx 9+t high

# Expect sector to 1or0 )etter than omni antenna 1ithin 789deg sector pattern&since has higher gain

,ptions +or Linux laptop mo)ile station 2M!3%

# External 24!/?connected3 :8;9& 1ith handheld large omni?directional antenna

# 6nternal 6ntel :8;9 WiMAX modem& and internal antenna

# Expect large omni antenna to 1or0 )etter than internal antenna

# Expect pac0et loss and throughput to ar$ +rom moment?to?moment& due to M!position and multi?path propagation



2continued3

-or each option com)ination%

# A3 /! sector& M! omni antennas

# /3 /! sector& M! internal antennas

# C3 /! omni& M! omni antennas

# D3 /! omni& M! internal antennas

-or each point%

# >7 # >B# option +or C3% >7 # >B and 7 #

Plot s distance 2mi3 +rom )ase station to mo)ile station%

# DL R!!6 2d)3

# 4L R!!6 2d)3

# 799B)$te pings& the I o+ responses not 1ithin 1indo1 2lost3

# DL iper+ throughput& min and max oer three attempts 2M).s3

# 4L iper+ throughput& min and max oer three attempts 2M).s3


12/24Sponsored by the National Science Foundation12

March 15, 2011

"eigh)orhood o+//" Technologies& Cam)ridge& MA



March 15, 2011

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March 15, 2011

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A3 Measurements results +or/! 1ith sector& M! 1ith external omni antennas



/3 Measurements results +or/! 1ith sector& M! 1ith internal antennas


17/24Sponsored by the National Science Foundation 1>March 15, 2011

C3 Measurements results +or/! 1ith omni& M! 1ith external omni antennas


18/24Sponsored by the National Science Foundation 1?March 15, 2011

C83 Measurements results +or/! 1ith omni& M! 1ith external omni antennas


19/24Sponsored by the National Science Foundation 1@March 15, 2011

D3 Measurements results +or/! 1ith omni& M! 1ith internal antennas



Measurements !ummar$

R!!6s

# DL R!!6s aries +rom ?=9d) +or a strong signal point& do1n to

?:>d) +or a 1ea0 signal pointH )elo1 that& the connection +ails

# 4L R!!6s remained more constant& o+ten close to ?;d) +or a 1iderange o+ points 6s this due to automatic WiMAX 4L transmitpo1er adNustmentsO

Ping loss 2799B)$tes3# Measured dela$s are relatiel$ constant 2B9 # 799ms3 until lin0 is

a)out to +ail

# -or 799B)$te pings& the I o+ responses not 1ithin 1indo1 2lost3increases uic0l$ as lin0 is a)out to +ailH other1ise 9I

# Good measure o+ oerall connection ualit$


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2continued3

iper+ Throughput

# 4se o+ TCP gies conseratie result& )ut is t$pical o+ man$

applications

# 4se o+ TCP results in signi*cant ariations oer the = runs& due topac0et losses and retransmissionsH need to consider )oth min andmax

# As lin0 gets poorer& the throughput eentuall$ +alls to 5ero

# DL throughput is t$picall$ )etter than 4L throughput& +ollo1ingWiMAX conention

# /est case DL throughput is oer 79M).s

# /est case 4L throughput is approximatel$ 7 M).s


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2continued3

Range%

# /est range 2to point >B& 98;>mi3 seen 1ith /! sector antenna and

M! handheld large omni antenna

# Range is 1orse& as expected& 1ith /! sector antenna and M!internal antenna

# Worst range 2to point >:& 98mi3 seen 1ith /! omni antenna andM! handheld large omni antenna

# 'o1eer& range is )etter 1ith /! omni antenna and M! internalantennaH 1h$O

# Expected pac0et loss and throughput to ar$ +rom moment?to?moment& due to M! position and multi?path propagation& )ut notdirectl$ eri*ed

# Range at points 7 ? compara)le to range at points >7 # >eri*es expected =:9deg omni coerage

# !ignal gone at point o)structed )$ )uilding


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Conclusions and "ext !teps

Current measurements gie range o+ approximatel$ 98;mi

# 'o1 does this range compare 1ith othersO

# What might )e done to improe rangeO

,ther reported ranges%

# Text)oo0 gies calculated range o+ 9:mi

# Clear1ire plots indicate their /!Js are approx 9;mi apart

# 4ni Colorado plan calculates range up to 9;mi

# /ut& commercial serices operate at higher po1er& and includediersit$ at /! and sometimes diersit$ at M!

# "4 Pol$ measurementsO

# 4CLA measurementsO

# 4ni Wisconsin measurementsO


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2continued3

Consider to improe range%

# -ix some mista0e in /T! parameters

# Modi+$ /T! parameters to improe range )$ +orcing reduced rate

# Add diersit$ at /! 2reuires an extra ,D4 and an extra antenna3

# 4se ehicular omni antenna at M! 2includes ground plane3

# Add diersit$ at M!O

# Tune up TCP and.or WiMAX parameters to improe throughput& eg&

reduce iper+ )uKer length so pac0ets *t 1ithin MT4

# Turn ," ARQ or 'ARQ

# 4tili5e +or 4DP trac& and accept more lost pac0ets

# Can 1e get to 9:miO

Expected to reduce range%

# 4se o+ M!s indoors

# Leaes on trees starting in spring

031711 bbnwimaxrangethroughmeas

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