May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Real use situation 2.4GHｚ 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
Koichiro Hayashi NYK
May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
Real use situation 2.4GHz in Typical
Japanese Container Yards
NYK Line
Koichiro Hayashi
Submission
Koichiro Hayashi NYK
May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
About NYK
Trade 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
Koichiro Hayashi NYK
May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
NYK’s Activities in EPCglobal
• GS1/EPCglobal Chair at TLS committee
• Conducted EPCglobal TLS Pilots
(Phase 1 ~ Phase 3)
• NYK’s Preference on RFID Technology
– Open Standard
– Worldwide Acceptance
– Don’t interfere with Existing Systems /
Installations (not limited to RFIDs)
Submission
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
May, 2010
NYK Container Yard in Tokyo
Transfer crane
Gantry crane
14000TEU
275000m2
900mx300m
200m
Office
Commands are sent to crane operators by using 2.4GHz WiFi network.
Submission
Koichiro Hayashi NYK
doc.: IEEE 802. 15-10-0305-01-004f
May, 2010
Channel problem
There 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.
User4
NYK
User3
User1
User2
Submission
Koichiro Hayashi NYK
May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
Channel usage in 2.45GHz at CY
All 83.5MHz 2.4GHz bands are used.
Submission
Koichiro Hayashi NYK
May, 2010
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
Koichiro Hayashi NYK
May, 2010
doc.: IEEE 802. 15-10-0305-01-004f
Conclusion
• All WiFi bands are busy in Japanese yard.
• It is impossible to make channel plan,
because 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
frequently in the port. It is no interferences
with present WiFi infrastructure.
Submission
Koichiro Hayashi NYK