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Marat Zhanikeev [email protected] maratishe.github.io
2016/02/22@ITS研＠北海道大学
PDF: bit.do/160222
for Roadside Infrastructure
#beacons
#beaconstuffing
#roadside
#vehicular
#autonomous based on Wireless Beacons
Image-related Uses
3 Types of Vehicular Nets
WiFi
3G 3G
802.11p (WAVE)
GroupConnect Beacons
802.11a -n,ac Beacon Frame
01 M.Zhanikeev+0 "Opportunistic Multiconnect with P2P WiFi and Cellular Providers" ...4G and Beyond, CRC (2015)
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 2/112/11
Dense Wireless Spaces
03 X.Yang+0 "Throughput and Delay Limits of IEEE 802.11" IEEE Communication Letters (2002)
09 "Revolution WiFi: SSID Overhead Calculator" http://www.revolutionwifi.net (2016)
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 3/113/11
Beacons: Broadcast vs UnicastBroadcast better than Unicast
... at levels below flooding
0 2000 4000 6000 8000Throughput (kbps)
P2P WiFi Unicast
Beacon Broadcast
P2P WiFi thru#220 Beacon thru#8858 Beacon fps#2480Nodes#30 in 25x25m P2P WiFi Condition: wifi
• 30 nodes, but only 5random nodes talk
• measure: with all collisionsand overhead, one2allgoodput
• P2P WiFi is represented byWiFi Direct 01
01 M.Zhanikeev+0 "Opportunistic Multiconnect with P2P WiFi and Cellular Providers" ...4G and Beyond, CRC (2015)
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 4/114/11
Beacon Density (model)
0 4000 8000FPS
0
0.4
0.8
Loss
pro
babi
lity
Beacon loss probability curve
• model of the conditions in the previous page
• simpler to model beacon-based dataexchange
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 5/115/11
Simulated Roadside SectionRoadside beacon
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 6/116/11
Images ～= Video Streaming• for simple images, assume that only the I-Frame (1st) is used
• otherwise, aiming at (even if low-bitrate) video streaming
0 20 40 60 80 100Time sequence
020406080
100
Fram
e siz
e (k
b)
SVCVBR
0 20 40 60 80 100Distribution sequence
020406080
100
Fram
e siz
e (k
b)02 M.Zhanikeev+0 "How variable bitrate video formats can help P2P streaming..." Springer J. of Elec. Commerce (2015)
08 R.Chandra+3 "Beacon-Stuffing: Wi-Fi without Associations" 8th IEEE HotMobile (2007)
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 7/117/11
Simulation Results
0 2 4 6 8 10 12 14Frame in GOP
0
1
2
3
4
5
6
7
8
No.
of p
aral
lel c
hann
els
0.7
0.3
0.2
0.2
0.1
0.1
0.1
0.1
0.6
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.6
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.5
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.4
0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.3
0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.3
0.1
0.1
0.1
0.1
0
0
0
0.3
0.1
0.1
0.1
0.1
0
0
0
0.3
0.1
0.1
0.1
0.1
0
0
0
0.1
0
0
0
0
0
0
0
• 10 beacons (9 cars + 1 roadside)
• parallel channels: upto 11 (5-6 are feasible andstrong) in practice◦ logic: randomly select a
channel and send yourbeacon
◦ not on commodityhardware (yet)
• bullets = lossprobability (zero = no
value = all lost)
• other cases https://goo.gl/B0qACx
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 8/118/11
Wrapup: The Big Picture
Service Provider
Roadside beacon
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 9/119/11
That’s all, thank you ...
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 10/1110/11
(donotforget) Connected Cars
3G
3G
3G
Basic Components
Conventional
Connected Cars
M.Zhanikeev -- [email protected] Image-Related Uses for Roadside Infrastructure based on Wireless Beacons -- bit.do/160222 11/1111/11
