doc.: ieee 802.11-11/0044r0 submission woong cho, etri jan 2011 slide 1 handover technology for...
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doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Slide 1Slide 1
Handover Technology for Vehicular Communications
Date: 2011-01-18
Name Affiliations Address Phone email Woong Cho ETRI 161 Gajeong-dong,
Yuseong-gu, Daejeon, Korea
+82-42-860-5289
Min Jung Kim ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea
+82-42-860-6268
Sang Woo Lee ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea
+82-42-860-5254
Hanbyeog Cho ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea
+82-42-860-5531
Hyun Seo Oh ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea
+82-42-860- 5659
Authors:
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Vehicular Communications
• V2V(Vehicle-to-Vehicle) applications:– Vehicle safety via vehicle multi-hop communications
• V2I(Vehicle-to-Infrastructure) applications:– ITS/Telematics via communications
• Basic requirements– Communication schemes: broadcasting, unicasting– Mobility: up to 200km/h– Long packet transmission:~2K bytes– Packet Latency: <100 msec – Networking: V2I, V2V
Slide 2
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Standards for Vehicular Communications
• WAVE(Wireless Access in Vehicular Environments)– IEEE 802.11p
• PHY/MAC Layers
• Published in July 2010
– IEEE 1609.x
• 1609.1 : Remote management service
• 1609.2 : Security services for application and management messages
• 1609.3 : Networking services
• 1609.4 : Multi-channel operation
• 1609.11: Over-the-Air data exchange protocol for ITS
• 1609.3,4 & 11: Published in 2010 and 2011
The others: Will be published in 2011
Slide 3
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Handover Issues
• Vehicles are moving rapidly along roads − Handover occurs often, and handover issues become more
important than 802.11− When OBE enters new RSE, it takes long channel scanning
time to carry out handover− Handover may have some specific schemes depending on the
road structures
• 802.11p does not provide a sufficient answer for handover issue
• Fast handover scheme in vehicular environments− Supports continuous communication between RSEs− Provides various services
Slide 4
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Slide 5
• Communication Setup– IEEE 802.11p
• Data rate: QPSK
• Tx power: 15~20dBm EIRP
– IEEE 1609.3 & 1609.4• Single PHY RSE & OBE : CCH/SCH alternative access (using
PPS)
• Adjacent RSUs use common CCH & different SCH for same service ( 1 CCH & 2 SCHs)
– L2 Handover by SCH Assignment ( based on RSSI)
• Provided Services– V2I: Internet streaming & CCTV (use fixed IP address)
– V2V: Safety messages
Implementation of Handover
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Slide 6
Communication environments/Application scenarios
Busan-Ulsan Express way Jangan IC ~ Onyang IC (total length 11.0km)
RSE : 5EA, Avg. Distance between RSEs. 1.04 kmSpeed
60km/h(forward) 100 km/h(reverse)ITS WC 2010 (SMART HIGHWAY project)
Busan-Ulsan Express way Jangan IC ~ Onyang IC (total length 11.0km)
RSE : 5EA, Avg. Distance between RSEs. 1.04 kmSpeed
60km/h(forward) 100 km/h(reverse)ITS WC 2010 (SMART HIGHWAY project)
RSE #1 RSE #2 RSE #3 RSE #4 RSE #5
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Slide 7
RSE0(CCH:f0, SCH:f1)
RSE1(CCH:f0, SCH:f2)
RSE2(CCH:f0, SCH:f1)
RSE0,SVC1, f1RSE0,SVC1, f1 RSE1,SVC1, f2RSE1,SVC1, f2 RSE2,SVC1, f1RSE2,SVC1, f1
SCH:f1 SCH:f2 SCH:f2 SCH:f1 SCH:f1
WAVE Service Server
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Slide 8
0 50 100 150 200 250 300-90
-80
-70
-60
-50
-40
-30
Time, X 1 sec
RS
SI
Forward direction, 2010.10.27
RSE1
RSE2
RSE3RSE4
RSE5
RSE4 signals
RSSI Measurements
– Vehicle speed: 60km/h– Changing of RSSI color: Handover occurs
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Next Step in Vehicular Communications
• Consider– Service needs• Provide various services including multimedia service
• Continuous CCTV, Web browsing
– Fast & Seamless handover scheme with 802.11p– Support L3 handover
• Provide lossless packet forwarding mechanism
– Support vertical handover • Support continuous communications with various media
(cellular, WiBro(WiMax), WAVE and Etc.)
Slide 9
doc.: IEEE 802.11-11/0044r0
Submission Woong Cho, ETRI
Jan 2011
Straw Poll
• Yes :
• No :
• Abstain :
Slide 10
Q. Should IEEE 802.11 WNG receive further presentations on the topic of handover technology for vehicular communications?