submission may, 2010 koichiro hayashi nyk doc.: ieee 802. 15-10-0305-01-004f project: ieee p802.15...
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Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004fProject: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Real use situation 2.4GH ｚ in Typical Japanese Container Yards]Date Submitted: [17 May, 2010]Source: [Koichiro Hayashi] Company [NYK]Address [2-3-2 Marunouchi Chiyoda-Ku Tokyo 100-0005 Japan]Voice:[+81 3 5222 7619], FAX: [+81 3 5222 7680], E-Mail:[[email protected]]
Re: [
Abstract: [This document has been shown the typical usage of 2.4GHz and density of ocean containers in Japanese container yards]
Purpose: [Understanding Real Usage of 2.4GHz in Japanese Container Yard]
Notice: .Release: ..
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
Real use situation 2.4GHz in Typical Japanese Container Yards
NYK Line
Koichiro Hayashi
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
About NYKTrade name NYK Line
(Nippon Yusen Kaisha Line)
Established 1885
Head office Tokyo, Japan
Gross Sales JPY 2.4 trillion (US$ 24,737 million)
*2008 Fiscal Year
Number of employees 55,975
President Yasumi Kudo
Business areas Ocean carrier
Logistics Integrator
Size of Container Fleet 99 Vessels (398, 446 TEUs)
No 1. in Japan
No 10 among Worldwide Container Operators
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
NYK’s Activities in EPCglobal
• GS1/EPCglobal Chair at TLS committee• Conducted EPCglobal TLS Pilots (Phas
e 1 ~ Phase 3) • NYK’s Preference on RFID Technology
– Open Standard– Worldwide Acceptance– Don’t interfere with Existing Systems / Inst
allations (not limited to RFIDs)
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
NYK Container Yard in Tokyo
200m Office
Gantry crane
Transfer crane
Commands are sent to crane operators by using 2.4GHz WiFi network.
14000TEU275000m2
900mx300m
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
Channel problemThere are many WiFi users.Usually, there are some container yards orated different company around the port. So we can not control channel plan taking account of how adjacent company.
NYK
User1
User2
User3
User4
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
Channel usage in 2.45GHz at CY
All 83.5MHz 2.4GHz bands are used.
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
Cellular model
6 cells are needed to cover with 300m radius cells.Assuming 12000 containers are stored as same density in this yard, there are 2000 container in a cell.2000 tags attached on containers transmit 2.5m second signal every 10 second. It means 50% Duty. If tags don’t have carrier sense, WiFi need to send retry packet, it will make slow dawn the though put.
Submission
May, 2010
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
Conclusion
• All WiFi bands are busy in Japanese yard.• It is impossible to make channel plan, becaus
e there are many WiFi user.• 2.4GHz tags will make impact to present WiFi
infra sericulture if it use of WiFi channel.• 26th Ch of Zigbee channel is not use frequent
ly in the port. It is no interferences with present WiFi infrastructure.