Transcript Diapositiva 1 - Telecom Italia Corporate

Transparent Bandwidth Aggregation
in a
Residential Access Network
Yufeng Duan
Supervisor: Prof. Paolo Giaccone
Collaborators: Pino Castrogiovanni,
Dario Mana, Claudio Borean
Motivation
A Transparent Bandwidth Aggregation in Residential Network
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Motivation
802.11b 54 Mbit/s
802.11n 72.2 Mbit/s (2.4GHz)
ADSL2+M D=24.0 Mbit/s
U=3.3 Mbit/s
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Previous Work
[1] Kandula, S., Lin, K. C. J., Badirkhanli, T., & Katabi, D. (2008, April). FatVAP: Aggregating AP Backhaul Capacity to Maximize
Throughput. InNSDI (Vol. 8, pp. 89-104).
[2] Giustiniano, D., Goma, E., Lopez Toledo, A., Dangerfield, I., Morillo, J., & Rodriguez, P. (2010, September). Fair WLAN backhaul
aggregation. InProceedings of the sixteenth annual international conference on Mobile computing and networking (pp. 269-280).
ACM.
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Our Propose
Beyond One’s Bandwidth
ISP POP
AG1
AG2
AG3
Our Propose
ISP POP
60%
40%
AG1
100%
AG2
70%
30%
AG3
• Totally transparent to the clients
• Supports also 802.11n
Load Balancing Problem
Path 1
Neighbor
AP
Local AP
Path 2
Local User
Load Balancing Problem
?
Neighbor
AP
Local AP
?
New flow
Local User
Load Balancing Solution
Round Robin Algorithm
?
Neighbor
AP
Local AP
?
Local User
Load Balancing
Pending Flow Balancing (PFB)
Path 1
Neighbor
AP
* 9 flows
10 flows
Local AP
Path 2
Local User
User Fairness Guarantee
A user only shares the bandwidth when itself
is not affected.
Local
AP
Neighbor
AP
Traffic generated Traffic generated
by local user
by neighbor user
Hierarchical Token Bucket
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Implementation
AP0
AP0
A Transparent Bandwidth Aggregation in Residential Network
AG3
sta0
AP1
AG2
eth0
sta0
AP1
AG1
eth0
sta0
AP1
eth0
AP0
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Performance
Cloud storage uploading throughput
2APs
3APs
X2
X3
X2
X3
X1 or X1.2
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Performance
Load balancing algorithm on symmetric and
asymmetric links
Total File Size
(MB)
# Files
theory
PFB
RR
116
100
235.1
264.4
283.2
Total File Size
(MB)
116
# Files
theory
PFB
RR
100
235.1
272.3
357.7
Time (s) used to upload files
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Performance
User fairness
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Discussion
• Our propose
o Totally transparent to the users
o A user cannot see a performance degradation
while sharing
o It also supports 802.11n
• Cloud storage behavior
o Google Drive: opens 3 connections, connection
rate detection, traffic steering
o Dropbox: sometimes 2 TCP connections, both
for data transfer
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Discussion
• Load balancing algorithm
o PFB is more important in heterogeneous
network: 3G/4G
• Introducing SDN
o Implementation can be easily migrated to Open
VSwitch
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Thank you
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