© NASA & Hitachi, Ltd. 2014. All rights reserved. Field Trial and Test Results September 24 th, 2014 Brian Crowe, Hitachi Communication Technology America

© NASA & Hitachi, Ltd. 2014. All rights reserved.

Field Trial and Test Results

September 24th, 2014

Brian Crowe, Hitachi Communication Technology AmericaRafael Apaza, NASA Glenn Research Center

- With Technical Demonstrations -

Document for ICAO WG-S/6 13-14 November, Sendai, Japan

ACP WG S/6 WP09

© NASA & Hitachi, Ltd. 2014. All rights reserved. 2

1. Outline of Field Trial Results

2. Test Items and Results

3. Security

Contents

4. Future Work


1. Outline of Field Trial Results

3

© NASA & Hitachi, Ltd. 2014. All rights reserved.NASA/Hitachi Confidential Proprietary

1.1 Outline of the Field Trial Tests

4

Purpose of the Testsa. Research and evaluate AeroMACS MOPS (Minimum Operational Performance

Standards) compliant products utilizing the NASA CNS Test-bedb. Develop recommendation for ICAO (International Civil Aviation Organization)

/SARPs(Standards And Recommended Practices) standardization for safety of flight applications of a wireless communications network on the airport surface that includes both mobile and fixed elements

c. Characterize and analyze path loss in the airport environment and evaluate potential interference with uplinks to mobile satellite systems

Testing Parties: NASA Glenn Research Center, Hitachi, Ltd. & HCTA, Inc.

Testing Schedule: April 14, 2014 – July 31, 2014

Testing Locationsd. Cleveland Hopkins International Airport (CLE)e. NASA Glenn Research Center(GRC) Building110

Outline of Resultsf. Planned test items were all completed with satisfactory data on basic

performance such as throughput (MIMO-A/B), path loss and mobility (incl. Handover) in the real airport environment.

g. Test data analysis is now in process, and the final report will be presented at the next ICNS meeting in April 2015.


1.2 Area Map and BS/SS Deployment

5

BS

#1A

z=15

deg

Fc=

5100

MH

z

BS#3Az=290degFc=5125MHz

BS#2

Az=250deg

Fc=5120MHz

SSALSF

(2,748m)

SSCMF

(1,585m)

SSTerminal C

(448m)

BS#1~3ARFF

MSINE point

MSARFF2

MSARFF1

GRC/B110

Wireless backhaul

© NASA & Hitachi, Ltd. 2014. All rights reserved. 6NASA/Hitachi Confidential Proprietary

Test items covering the following five categories of testing are a “World’s 1st” from the standpoint of comprehensiveness.

1. Initial Network Entry Test

2. Throughput Test

3. QoS Test

4. Mobility Test

5. Long Term Stability Test

1.3 Field Trial Test Items


1.4 Field Trial Schedule

7

Month April May June July AugustSeptembe

rOctober November

Milestone

Events

Field Trial Schedule

EquipmentBrought In

Kickoff DEMO

WiMAX Aviation2014@Brussel

WiMAX Aviation2014@Sendai

LaboratoryInstallation

Laboratory Test

Field Deployment

Area Optimization

Field Trial TestsTest Results Analysis

Application Development

Additional Tests

Un-installation

EquipmentShipping


2. Test Items and Results

8

2.1 Initial Network Entry Test2.2 Throughput Test2.3 QoS Test2.4 Mobility Test2.5 Long Term Stability Test


2.1 Initial Network Entry Test (1/3)

2.1.1 Objectives of the Tests

To validate and prepare recommendations for SARPs(ICAO)

2.1.2 Test Configuration

(1) Initial Network Entry (INE) in single (2) INE in Multiple BS Environment BS environment

BS#1

SubscriberStation

Single BoardComputer

BS#2

MobileStation

LaptopComputer

BS#1 BS#3

Freq.RSSICINR

5100MHz-88dBm

1dB

5120MHz-90dBm

9dB

5125MHz-84dBm

15dB

(3) INE in driving condition on the Runway @ 50 knot

BS#2

MobileStation

LaptopComputer

BS#1 BS#3

(a) 5100MHz Fixed(b) 5 MHz Step(c) 250 kHz Step

(a) 5 MHz Step(b) 250 kHz Step

(a) 5 MHz Step(b) 250 kHz Step


ScanT1

RNG

SBC

PKM

REG

DSA

Sub INE time: T1 This depends on the MS implementation.

Sub INE time: T2 This depends on the environment around MS and BS.

Definition of T1 and T2 Both were proposed by Hitachi and approved by ICAO.

Ranging & Automatic adjustments

Negotiate basic capabilities between MS and BS

Authentication for entering network

MS registration to network

Establish IP connectivity

Operational data exchange

Dynamic Service Flow establishment

MS to scan for DL channel

MS to synchronize to DL of BS

MS to select best channel to synchronize

T2


Definition of Initial Network Entry



Fixed 5000kHz Step 250kHz Step

Scan 0.16 1.25 23.65

RNG 0.14 0.14 0.14

SBC 0.16 0.14 0.09

PKM 1.2 1.18 1.22

REG 0.13 0.13 0.11

DSA 0.27 0.27 0.3

3

8

13

18

23

28

Average Initial Network Entry time (Terminal C)T

ime

[se

c]

Number of Scan Points 1 11 201

Scan Time/ Number of scan

points0.16 0.11 0.12

T2=1.90

T2=1.86

T2=1.86

93%

7%

2.1.3 Test Results

* 250kHz scan step is the standard value defined in SARPs.

T1= T1= T1=


Demonstration Time!

12

1. Initial Network Entry

a. Scan Range and Stepsb. Manual and Automaticc. Network Entry

i. Fixedii. 5 MHz Stepiii. 250 kHz Step


2.2 Throughput Test (1/4)

13

2.2.1 Objectives of the Test

a. To evaluate the basic performance of BS/SS/MS in a real airport environmentb. To obtain path loss datac. To validate the Technical Standard (i.e. Downlink/Uplink Ratio)d. To investigate the applicability of MIMO-A/B

2.2.2 Test Configuration (Ref. p.14 of “NASA/Hitachi AeroMACS Test-bed” for details)

ApplicationServer

Home Agent ASN-GW Base StationSubscriber

StationSingle Board

Computer

Downlink Traffic in UDP/iperf, 10-20 Mbps

Uplink Traffic in UDP/iperf, 5 Mbps



(1) Single MS/SS Peak Throughput:

7 x 4 x 3 = 84 combinations

- Location Parameters (7 cases) Basic Performance

Hitachi Laboratory (1) Vicinity of Base Stations (near ARFF), per Base Station (3)

Path Loss Effect (Term-C, CMF and ALSF, (3))

- Downlink : Uplink Symbol Ratio (26:21, 29:18, 32:15, 35:12, (4 cases)

- Type of Link (Downlink MIMO-A, Downlink MIMO-B and Uplink, (3 cases))

(2) Round Trip Time: 7 x 4 x 3 = 84 combinations

- Same as above

(3) Multiple MS/SS Sector Throughput: 4 x 4 x 3 = 48 combinations

- Same as above except for excluding Path Loss Effect

- Number of MS = 10 (Hitachi Lab.), 2 (Field Trial)

2.2.3 Test Items

26 21

29 18

32 15

35 12

AeroMACSTDD Frame = 5 msecTotal = 47 Symbols

Downlink UplinkSymbols Symbols

BS

MS/SS

MS/SS

BS



15

2.2.4 Single MS/SS Peak Throughput Test Results

(1) BS Basic Capability (Single SS/MS Peak Throughput)

No. Link identificationDownlink : Uplink Symbol Ratio

26:21 29:18 32:15 35:12

1Downlink

MIMO-A 6.1 7.3 8.3 9.2

2 MIMO-B* 11.7 14.9 16.6 19.1

3 Uplink 4.7 3.9 3.1 2.3

(UDP, iperf, BW=5MHz, unit:Mbps)

Transmitter

Receiver

A

Transmitter

Receiver

A

Rx Antenna Diversity[AeroMACS Uplink]

Note) What is MIMO (Multiple Input and Multiple Output)?

Transmitter

Receiver

A

MIMO-A (Space Time Coding)

A -1

Transmitter

Receiver

B

MIMO-B (Spatial Multiplexing)

A

*option



16

26:21 29:18 32:15 35:120

1

2

3

4

5

6

7

8

9

10

Hitachi Lab.Term-CCMFALSF

DownlinkMIMO-A

(Mbps)

(2) Path Loss Effect (Single SS/MS Peak Throughput, UDP/iperf)

No.SS Site

Distance to ARFF DL CINR (dB) MCS

1 Term-C 448m 28 64QAM-5/6

2 CMF 1585m 24 64QAM-5/6

3 ALSF 2748m 21 64QAM-2/3


Demonstration Time!

17

1. EFB Application (Weather Information Access)

2. Pilot – Tower Communication (VoIP)** an optional future capability

3. Airport Surveillance Camera (@Laboratory R310)


EFB Application (Weather Information Access)

18

BS ASN-GW HA NATserver

WiFirouter

MS

AAA

Tablet

Pilot

WSI weather information to EFB

Weather information - Simulating gathering weather information from “WSI Pilotbrief Optima” site to EFB via

AeroMACS network.

EFB

WSI site

WSI: Weather Services InternationalEFB: Electronic Flight Bag

DNS

Network


Pilot – Tower Communication (VoIP)

19

BS ASN-GW HA NATserver

WiFirouter

MS

AAA

Laptop

Ground controller

Tablet

Pilot

Directions from control tower to aircraft

Voice over IP (an optional future capability) - Simulating a communication between control tower and aircraft using Skype.

DNS

Network


Airport Surveillance Camera

20

BS ASN-GW

Webcamera

SS

AAA

Monitoring center

Surveillance video from web camera to monitoring center

Video surveillance - Simulating airport surveillance video between web camera and monitoring center.

Runway/Taxiway

Laptop

HA


2.3 QoS Test (1/3)

21

2.3.1 What is QoS?

QoS serves for scheduling of the data transfer through QoS-enabled Service Flows according to the established QoS traffic parameters.

No. Name Meaning ApplicationApplication Example(IEEE802.16/MASPS)

1 UGSUnsolicited Grant

ServiceReal-time data with fixed-data-rate

- E1/T1 transport- Circuit switched voice- VoIP without silence suppression

2 rtPSReal-Time Polling

ServiceReal-time data with variable-bit-rates which require guaranteed data rate and delay

MPEG Video

3 nrtPSNon-Real-Time Polling Service

Guaranteed data rate but insensitive to delays

FTP

4 BE Best Effort Service No rate or delay requirements HTTP

5 ertPSExtended-Real-Time

Polling ServiceReal-time data with variable-data-rate which require guaranteed data and delay

VoIP with silence suppression


To verify the Technical Standard (Network) To validate that a single SS/MS accommodates multiple QoS class communication

links


2.3 QoS Test (2/3)

22

2.3.3 Test Configuration: How to establish Multiple Service Flows(SF)< Definition of Service Flows >

SBC/SS BS/ASN-GW/HA APPServer

Service Flow #1

Service Flow #3

Service Flow #2

Service Flow #4

Downlink: BE

Downlink: UGS

Uplink: BE

Uplink: UGS

< Description in AAA Configuration file based on WMF Network Architecture> QoS Class is assigned onto port numbers per IP Address (SS/MS) in the AAA configuration file

<IP Address> <Port Number> <QoS Class> <Direction>

Example for upper case <IP Address of SS> < Port Number =5001> <BE> <Downlink> <IP Address of APP Server> < Port Number = 5002> <BE> <Uplink> <IP Address of SS> < Port Number =5003> <UGS> <Downlink> <IP Address of APP Server> < Port Number = 5004> <UGS> <Uplink>


2.3 QoS Test (3/3)

23

2.3.3 Test Items (1) Multiple Service Flows (4SF) for Single MS/SS: 8 combinations (2) Multiple Service Flows for Multiple MS/SS (a) 4 SFs for 2 MS/SS that are connected to the same BS: 8 combinations (b) 6 SFs for 2 MS/SS that are connected to

the same BS: 8 combinations2.3.4 Test Result Example: 2.3.3(1) UGS + BE (DL)

1801962122282442602762923083243403563723884044204364524680

2

4

6

8

10

12

14

16

UL Packet Error Rate

UGS

BE

Time [sec]

High PER (1)- BE: 8.47 %- UGS: 0 %

18019621222824426027629230832434035637238840442043645246820

22

24

26

28

30

DL CINR

Time [sec]

High PER (2)- BE: 15 %- UGS: 0 %

High PER (3)- BE: 11.17 %- UGS: 0 %

0 34 68 1021361702042382723063403744084424765105445780

1

2

3

UL Throughput

UGS

BE

Time [sec]

BE data start BE data end

[Mbps]

[dB]

[%]

* UL data of UGS is always transferred using QPSK-1/2 which is the most robust MCS class. This is the original design of Hitachi AeroMACS prototype.


QoS Validation

24

BS ASN-GW

SS#2

AAA

Iperf data (5Mbps from each SS)QoS class: BE

SS#3

SS#1

Iperf data (0.2Mbps)QoS class: UGS

Streaming dataQoS class: BE

UGS data transmitting from SS#1 to Laptop#2 is guaranteed during other big BE data is transmitting.

HA

LET IT BE♪

Laptop#3

Laptop#2

Laptop#1

BE: Best EffortUGS: Unsolicited Grant Service

Quality of Service


Demonstration Time!

25

1. QoS Validation (Video Demo)

2. QoS Demonstration (@Laboratory R310)


2.4 Mobility Test (1/3)


To identify the area where AeroMACS communication is available To obtain Path Loss data by measuring the radio field of the airport To demonstrate handover between base stations in a real airport environment

2.4.2 Test Configuration

(1) Path Loss Measurement & (2) Handover Performance on Runway & CINR/RSSI Distribution Map Peak Throughput at Driving Condition Generation @ 50 knot

BS#2

MobileStation

LaptopComputer

BS#1 BS#3 BS#2

MobileStation

LaptopComputer

BS#1

Without neighbor information With neighbor information


2.4 Mobility Test (2/3)Handover on the Runway: Southwestward

27

HandoverPoint

HandoverPoint

BS#1&BS#2

Handover: Success (Controlled Handover) @ Runway 24L/24R Speed: >50 knot Direction: Southwestward Handover Latency: 160 – 200 msec.


2.4 Mobility Test (3/3)Handover on the Runway: Northeastward

28

HandoverPoint

HandoverPoint

BS#1&BS#2

Handover: Success (Controlled Handover) @ Runway 6R/6L Speed: >50 knot Direction: Northeastward Handover Latency: 160 – 200 msec.


Handover on the Runway (CLE)

29

BS#2 ASN-GW HA

AAA

Runway

Handover

Handover (Pre-recorded)

BS#1

MS MS

50 knot

Controlled Handover is successfully executed from BS#1 to BS#2 during running at 50 knot on runway.


Demonstration Time!

30

1. Handover on the Runway (CLE)


2.5 Long Term Stability Test (1/4)

31


To verify BS Holdover functionality after Loss of GPS Signal To check the blockage of the wireless communication link by the airplane To obtain Rain/Fog/Snow attenuation effect data To check the stability of the system working in a real airport environment

2.5.2 Test Items

(1) BS Frequency & Time Stability without GPS Signal

(2) Blockage Effects by Airplanes

(3) Rain Attenuation

(4) Interference between Adjacent Channels using Different DL:UL Symbol Ratios

(5) Observation of System Performance



32

Frequency error was maintained within 100 Hz for 24 hours.

0 4 8 12 16 20 24-200

-100

0

100

200

Time after loss of GPS [hours]

Fre

qu

en

cy

Err

or

[Hz]

Timing Offset was maintained within 400 ns for 24 hours.

0 4 8 12 16 20 24-1000

-500

0

500

1000

Time after loss of GPS [hours]

1 P

PS

Inte

rva

l Err

or

[ns

ec

]

2.5.3 Test Results

(1) BS Frequency & Time Stability without GPS Signal



33

View from SS (@CMF)

BS (@ARFF)B737@Kilo

E190@Golf

B737@Kilo

CRJ700@24R

CRJ700@24R

B737@24R

B737@24R

E190@24R

B737@Golf

VideoSurveillance

Started



34

(2) Blockage Effects by Airplanes between ARFF and CMF

View from SS (@CMF)

BS (@ARFF)B737@Kilo

E190@Golf

B737@Kilo

CRJ700@24R

CRJ700@24R

B737@24R

B737@24R

E190@24R

B737@Golf

VideoSurveillance

Started


3. Security

35


3. Security Results

36

3.1 Hitachi SS’s access to Alvarion BS

Hitachi Mobile Station (when it was located near ARFF) found Alvarion BS after scan at the INE as the most favorable one

It tried to enter the network via Alvarion BS but couldn’t do so because the Alvarion AAA rejected.

. 3.2 Alvarion SS’s access to Hitachi BS

Alvarion Subscriber Station found Hitachi BS after scan (the output power of the Alvarion BS is now lowered to 1dBm).

It is still trying to enter the network via Hitachi BS but can’t do so because Hitachi AAA keeps on rejecting.


4. Future Work

37


4. Future Work

38

4.1 Tests Using Another Subscriber Station

Outdoor Type Subscriber Station is coming soon. Basic Performance will be examined in the Airport environment.

. 4.2 Extended Tests with FAA

Details are under discussion

4.3 Final Report Presentation

Final Report will be presented at the next ICNS Conference in April 2015.


Acronyms(1/2)

39

16QAM 16 Quadrature Amplitude Modulation64QAM 64 Quadrature Amplitude ModulationAAA Authentication, Authorization and AccountingAeroMACS Aeronautical Mobile Airport Communications SystemALSF Approaching Lights and Sequenced Flashing lightsAM(R)S Aeronautical Mobile satellite (Route) ServiceAPP ApplicationASN Access Service NetworkARFF Aircraft Rescue and Fire FightingATC Air Traffic ControlBS Base StationCLE Cleveland Hopkins International AirportCMF Consolidated Maintenance FacilityCSN Connectivity Service NetworkDL DownlinkDNS Domain Name SystemEFB Electronic Flghit BagertPS extended-real-time Polling ServiceFAA Federal Aviation Administration GPS Global Positioning SystemGRC Glenn Research Center (NASA)GW GatewayHA Home AgentHCTA Hitachi Communication Technologies America, Inc.ICAO International Civil Aviation OrganizationICNS integrated Communications, Navigation, and Surveillance


Acronyms(2/2)

40

INE Initial Network EntryIP Internet ProtocolMIMO Multiple Input and Multiple OutputMS Mobile Station MOPS Minimum Operational Performance StandardsNASA National Aeronautics and Space Administration NAT Network Address TranslationnrtPS non-real-time Polling ServiceOFDMA Orthogonal Frequency Division Multiple AccessOMC Operation and Maintenance CenterQoS Quality of ServiceQPSK Quadrature Phase Shift KeyingrtPS real-time Polling ServiceSARPs Standards And Recommended PracticesSBC Single Board ComputerSF Service FlowSM Spatial MultiplexingSS Subscriber StationSTC Space Time CodingTDD Time Division DuplexUDP User Datagram ProtocolUGS Unsolicited Grant ServiceUL UplinkV.S.W.R Voltage Standing Wave RatioWMF WiMAX ForumWSI Weather Services International


Field Trial and Test Results

September 24th, 2014

Toshihide Maeda, Hitachi, Ltd.Rafael Apaza, NASA Glenn Research CenterWilliam D. Ivancic, NASA Glenn Research Center

END

41


Backup Slides for Q&A

43


BS#1: RSSI

44

BS#1BS#2BS#3


BS#2: RSSI

45

BS#1BS#2BS#3


BS#3: RSSI

46

BS#1BS#2BS#3


BS#1: CINR

47

BS#1BS#2BS#3


BS#2: CINR

48

BS#1BS#2BS#3


BS#3: CINR

49

BS#1BS#2BS#3


Interference between Adjacent Channels using Different Symbol Ratio

50

5095 5100 5105 5110 5115 5120 5125 5130 5135NASA

BTS1-1BS#1 NASA

BTS2-1Not

UsedNASA

BTS2-3BS#2 BS#3 NASA

BTS2-2NASA

BTS1-2

[MHz]

Case-2 (20MHz) Case-1 (5MHz)

No.DL:UL Symbol Ratio BS#2 (ALSF) BS#3 (CMF)

BS#2 BS#3 DL UL DL UL

1 26:21 26:21 No Effect No Effect No Effect No Effect


3 26:21 32:15 No Connection No Connection No Effect No Effect

4 26:21 35:12 No Connection No Connection No Effect No Effect

No.DL:UL Symbol Ratio BS#1 (Terminal-C) BS#3 (CMF)

BS#2 BS#3 DL UL DL UL





Case-1) 5 MHz Separation

Case-2) 20 MHz Separation

26 21

29 18

32 15

35 12

AeroMACSTDD Frame = 5 msecTotal = 47 Symbols

Downlink UplinkSymbols Symbols


Rain Attenuation: Weather Data

51

Tested Date: June 18, 2014 Observed Event: Thunderstorm and Rain 18:35-19:47EDT Used BS & MS: BS#3 (5,125MHz) / SS(CMF) & SS(ALSF) Weather History:

Radar

Time (EDT) Temperature Sensible Temperature

Dew-Point Temperature

Humidity Atmospheric Pressure

Visibility Wind Direction

Wind Velocity Velocity of Gust Wind

Precipitation Event Weather

5:51 PM 25.6 °C - 20.0 °C 71% 1014.6 hPa 12.9 km NNE 18.5 km/h / 5.1 m/s - N/A 　 Cloudy6:35 PM 27.2 °C 28.9 °C 20.6 °C 67% 1016.1 hPa 12.9 km WSW 13.0 km/h / 3.6 m/s - N/A Thunderstorm Thunderstorm

6:44 PM 25.6 °C - 19.4 °C 68% 1017.5 hPa 9.7 km W 63.0 km/h / 17.5 m/s 85.2 km/h / 23.7 m/s 0.0 mm Rain,Thunderstorm Thunderstorm, Rain

6:46 PM 24.0 °C - 19.0 °C 73% 1017.5 hPa 1.2 km W 51.9 km/h / 14.4 m/s 85.2 km/h / 23.7 m/s 0.0 mm Rain,Thunderstorm Thunderstorm (Extreme), Rain

6:51 PM 21.1 °C - 19.4 °C 90% 1016.8 hPa 1.2 km WNW 38.9 km/h / 10.8 m/s 85.2 km/h / 23.7 m/s 5.8 mm Rain,Thunderstorm Thunderstorm (Extreme), Rain

6:55 PM 20.6 °C - 18.9 °C 90% 1017.2 hPa 4.8 km WNW 44.4 km/h / 12.3 m/s 59.3 km/h / 16.5 m/s 2.8 mm Rain,Thunderstorm Thunderstorm (Weak), Rain

6:58 PM 20.6 °C - 18.3 °C 87% 1017.2 hPa 4.8 km NW 37.0 km/h / 10.3 m/s 59.3 km/h / 16.5 m/s 3.8 mm Rain,Thunderstorm Thunderstorm, Rain

7:08 PM 21.1 °C - 19.4 °C 90% 1016.8 hPa 4.8 km NNW 29.6 km/h / 8.2 m/s 42.6 km/h / 11.8 m/s 4.6 mm Rain,Thunderstorm Thunderstorm (Weak), Rain

7:47 PM 21.0 °C - 19.0 °C 88% 1016.5 hPa 16.1 km E 13.0 km/h / 3.6 m/s - 4.8 mm 　 Cloudy7:51 PM 20.6 °C - 18.3 °C 87% 1016.2 hPa 16.1 km E 9.3 km/h / 2.6 m/s - 4.8 mm 　 Cloudy8:51 PM 20.6 °C - 18.9 °C 90% 1014.7 hPa 14.5 km ESE 11.1 km/h / 3.1 m/s - 0.5 mm Rain Light Rain9:51 PM 20.6 °C - 18.9 °C 90% 1015.9 hPa 16.1 km E 11.1 km/h / 3.1 m/s - 0.0 mm 　 Mostly Cloudy

Ref.) http://www.wunderground.com/history/airport/KCLE/2014/6/18/DailyHistory.html?req_city=NA&req_state=NA&req_statename=NA&MR=

18:00 19:00 20:00

CLE CLE CLE


Rain Attenuation: Obtained Data (DL)

52

20

14

/6/1

8 1

8:2

4:5

9

20

14

/6/1

8 1

8:2

9:5

9

20

14

/6/1

8 1

8:3

4:5

9

20

14

/6/1

8 1

8:3

9:5

9

20

14

/6/1

8 1

8:4

4:5

9

20

14

/6/1

8 1

8:4

9:5

9

20

14

/6/1

8 1

8:5

4:5

9

20

14

/6/1

8 1

8:5

9:5

9

20

14

/6/1

8 1

9:0

4:5

9

20

14

/6/1

8 1

9:0

9:5

9

20

14

/6/1

8 1

9:1

4:5

9

20

14

/6/1

8 1

9:1

9:5

9

20

14

/6/1

8 1

9:2

4:5

9

20

14

/6/1

8 1

9:2

9:5

9

20

14

/6/1

8 1

9:3

4:5

9

20

14

/6/1

8 1

9:3

9:5

9

20

14

/6/1

8 1

9:4

4:5

9

20

14

/6/1

8 1

9:4

9:5

9

20

14

/6/1

8 1

9:5

4:5

9

20

14

/6/1

8 1

9:5

9:5

9

20

14

/6/1

8 2

0:0

4:5

920.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0

DL_CINR 10sec Average with 1min moving Average [dB]

Thunderstorm Arrived

Thunderstorm Gone

2014/6

/18 1

8:2

4:5

9

2014/6

/18 1

8:2

9:5

9

2014/6

/18 1

8:3

4:5

9

2014/6

/18 1

8:3

9:5

9

2014/6

/18 1

8:4

4:5

9

2014/6

/18 1

8:4

9:5

9

2014/6

/18 1

8:5

4:5

9

2014/6

/18 1

8:5

9:5

9

2014/6

/18 1

9:0

4:5

9

2014/6

/18 1

9:0

9:5

9

2014/6

/18 1

9:1

4:5

9

2014/6

/18 1

9:1

9:5

9

2014/6

/18 1

9:2

4:5

9

2014/6

/18 1

9:2

9:5

9

2014/6

/18 1

9:3

4:5

9

2014/6

/18 1

9:3

9:5

9

2014/6

/18 1

9:4

4:5

9

2014/6

/18 1

9:4

9:5

9

2014/6

/18 1

9:5

4:5

9

2014/6

/18 1

9:5

9:5

9

2014/6

/18 2

0:0

4:5

90E+00

1E+06

2E+06

3E+06

4E+06

5E+06

6E+06

7E+06

8E+06

9E+06DL_MAC SDU Throughput Moving Average [bps]

Thunderstorm Arrived

Thunderstorm Gone

: Departure:Arrival

: Departure:Arrival


Round Trip Time

5353

Single MS/SS Round Trip Time 　（ QoS = BE)

No. Location BS IDTerminal

(Antenna Gain)

Round Trip Time [msec]DL:UL Symbol Ratio

26:21 29:18 32:15 35:12

1 Terminal C BS#1 SS (19dBi) 101 102 102 101 2 ALSF BS#2 SS (19dBi) 101 102 102 98 3 CMF BS#3 SS (19dBi) 100 99 101 100

RF Backhaul

PC MS BSMicroWave

SWASN-GW

SW HAMicroWave

SWSW

Round Trip Time

ping

L3SW

Hitachi AeroMACS components

Hitachi other equipment

NASA equipment

Round Trip Time means the time from transmission to reception of a ping command.

APL-SV

Round Trip Time Measurement Configuration

No. QoS Class Average Round Trip Time [msec]1 UGS 332 ertPS 463 rtPS 604 nrtPS 1015 BE 103

Single MS/SS Round Trip Time 　（ for each QoS class)


QoS Test Observation: Round Trip Time

5454

BR Ranging code (CDMA code)

UL-MAP(CDMA Allocation IE)

BW request

UL-MAP(Granted IE)

Data

Excluded in rtPS

Excluded in UGS or ertPS

SS BS

Following figure shows the sequence between SS and BS. Some of these processes are excluded for some QoS classes and consequently it make the Round Trip Time shorter. This sequence and QoS class algorithm are defined in the WiMAX Technical Standard.

QoS Data storing algorithm

Documents

© NASA & Hitachi, Ltd. 2014. All rights reserved. Field Trial and Test Results September 24 th, 2014 Brian Crowe, Hitachi Communication Technology America