1. Submission May, 2010 Koichiro Hayashi NYK 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 2.4GH 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:[koichiro_hayashi@monohakobi.com] 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:..

2. 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

3. Submission May, 2010 Koichiro Hayashi NYK doc.: IEEE 802. 15-10-0305-01-004f About NYK Trade nameNYK Line (Nippon Yusen Kaisha Line) Established1885 Head officeTokyo, Japan Gross SalesJPY 2.4 trillion (US$ 24,737 million) *2008 Fiscal Year Number of employees55,975 PresidentYasumi Kudo Business areasOcean carrier Logistics Integrator Size of Container Fleet99 Vessels (398, 446 TEUs) No 1. in Japan No 10 among Worldwide Container Operators

4. 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 (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)

5. 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. 14000TEU 275000m 2 900mx300m

6. Submission May, 2010 Koichiro Hayashi NYK doc.: IEEE 802. 15-10-0305-01-004f 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. NYK User1 User2 User3 User4

7. 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.

8. 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.

9. 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, 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.