.
Wireless Contention Problem
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- h...
.
Wireless Contention Basics
.
Contention Problem...
..
.
...cannot be solved by increasing capacity. It can only be solve...
.
Contention in LTE/3G
• measured using B-Mobile, OCN,
and Biglobe providers
• split into workdays, holidays, and
long hol...
.
Contention in Local WiFi (1)
1m
1.5m
10m
18m
• wireless classroom, 3 APs,
50 clients
• various configurations of APs
and...
.
Contention in Local WiFi (2)
0 10 20 30 40
Machine ID
5.85
6.3
6.75
7.2
7.65
8.1
ThroughputType1
Round 1
CH1 APCH5 APCH9...
.
Solution (1) MultiConnect
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- htt...
.
Parallel Wireless Connectivity
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -...
.
Traditional, MultiPath, MultiConnect...
• MultiConnect + MultiPath = GroupConnect
• 2-3 earlier papers (see my Google Sc...
.
Solution (2) GroupConnect
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- htt...
.
MultiConnect as Virtualization
.
Why Virtual?
..
.
Because multiple network resources are
merged into one. • Usecase 1: ...
.
Group Connect: Task Delegation
Remote connectivity
Local Connectivity
Content Provider
Main
Client
Delegated
Client
Dele...
.
Trace-Based Analysis
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://b...
.
GroupConnect Delegation Models
1. Paced Model : use a reasonably small group to achieve a target
throughput
◦ for exampl...
.
CRAWDAD Traces (KAIST)
0
2
3
13
14
18
2830 50
51
56
75
79
80
81
86
87
88
1
6
10
11
12
17
19
23
24 25
26
27
29
31
32
34
3...
.
Simulation Setup
• simple GroupConnect : one Master node, all other nodes are used for
delegation
• the paced and greedy...
.
Simulation Results
3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5
Throughput for Paced model ( 1 + log( x) for x > 1)
3.3
3.45
...
.
The New Wireless Campus
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http:...
.
University Campus : Objectives
• universities create their own WiFi hotspot networks, which are useless
(contention prob...
.
University Campus : Prototype
• (1) Univ COOP makes the app, adds security, (2) distributes the app to
students, (3) Gro...
.
University Campus and Clouds
• API tokens in cloud services can be shared via delegation
Student
Develop,
make
secure
AP...
.
Field Tests : CloudCamp2014@天神
http://cloudcampreps.herokuapp.com/
M.Zhanikeev -- maratishe@gmail.com -- Group Connect i...
.
That’s all, thank you ...
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- htt...
Group Connect in a New Wireless University Campus
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Group Connect in a New Wireless University Campus

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Group connect is a new kind of wireless multiconnect technology where wireless resources of multiple users can be pooled and virtualized. Ability to boost throughput of one member of a group at the expense of others is one of many practical utilities of the technology. This paper shows how a simple smartphone application based on group connect can create a brand new kind of university campus where students get online completely without any network support on the part of the campus itself. Economic benefits from such a technology to the university itself are obvious.

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Group Connect in a New Wireless University Campus

  1. 1. . Wireless Contention Problem M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 2/23 ... 2/23
  2. 2. . Wireless Contention Basics . Contention Problem... .. . ...cannot be solved by increasing capacity. It can only be solved by offloading capacity. • current 3G is awful in Japan, getting increasingly more restricted (traffic quotas, ...) • LTE is good only because it is relative new, same problem when penetration ratio grows • WiFi contention is at the level of OLD HUBs -- collision control, MIMO does not help much M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 3/23 ... 3/23
  3. 3. . Contention in LTE/3G • measured using B-Mobile, OCN, and Biglobe providers • split into workdays, holidays, and long holidays (golden week) • Biglobe is the winner, but only because it just came out at the time • average throghput: 300kbps M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 4/23 ... 4/23
  4. 4. . Contention in Local WiFi (1) 1m 1.5m 10m 18m • wireless classroom, 3 APs, 50 clients • various configurations of APs and per-AP groups • webapps, local web server M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 5/23 ... 5/23
  5. 5. . Contention in Local WiFi (2) 0 10 20 30 40 Machine ID 5.85 6.3 6.75 7.2 7.65 8.1 ThroughputType1 Round 1 CH1 APCH5 APCH9 AP 0 10 20 30 40 Machine ID 5.85 6.3 6.75 7.2 7.65 8.1 ThroughputType1 Round 2 0 10 20 30 40 Machine ID 5.85 6.3 6.75 7.2 7.65 8.1 ThroughputType1 Round 3 0 10 20 30 40 Machine ID 3.15 3.85 4.55 5.25 ThroughputType2 Round 1 0 10 20 30 40 Machine ID 3.15 3.85 4.55 5.25 ThroughputType2 Round 2 0 10 20 30 40 Machine ID 3.15 3.85 4.55 5.25 ThroughputType2 Round 3 Downward trend Long waiting time • Thruput Type 1: only successful HTTP req/ reps • Thruput Type 2: for each req, include failed/ repeated requests • reqs fail a lot at >= 25 clients (2 orders of magnitude diff) M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 6/23 ... 6/23
  6. 6. . Solution (1) MultiConnect M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 7/23 ... 7/23
  7. 7. . Parallel Wireless Connectivity M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 8/23 ... 8/23
  8. 8. . Traditional, MultiPath, MultiConnect... • MultiConnect + MultiPath = GroupConnect • 2-3 earlier papers (see my Google Scholar) with basics, optimizations, etc. • MultiConnect existed before, but GroupConnect is my term M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 9/23 ... 9/23
  9. 9. . Solution (2) GroupConnect M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 10/23 ... 10/23
  10. 10. . MultiConnect as Virtualization . Why Virtual? .. . Because multiple network resources are merged into one. • Usecase 1: no own Internet, use someone else's (AP) • Usecase 2: group apps, download + aggregate via multiple users (GroupConnect) • Usecase 3: multiple APs appear as one (Hiperf AP) • .... mobile cloud, local file sharing, ... M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 11/23 ... 11/23
  11. 11. . Group Connect: Task Delegation Remote connectivity Local Connectivity Content Provider Main Client Delegated Client Delegated Client 3G/LTE/* Access 3G/LTE/* Access M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 12/23 ... 12/23
  12. 12. . Trace-Based Analysis M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 13/23 ... 13/23
  13. 13. . GroupConnect Delegation Models 1. Paced Model : use a reasonably small group to achieve a target throughput ◦ for example: 100Mb file in 20s is a good practical target ◦ PRO: redundancy -- send same request to 2+ people ◦ CON: reliability problem -- target throughput is difficult to achieve 2. Greedy Model : grab as many people around you as you can ◦ flexible level of redundancy ◦ resilient for out-of-range problem M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 14/23 ... 14/23
  14. 14. . CRAWDAD Traces (KAIST) 0 2 3 13 14 18 2830 50 51 56 75 79 80 81 86 87 88 1 6 10 11 12 17 19 23 24 25 26 27 29 31 32 34 35 36 3738 39 40 41 42 43 44 45 46 48 52 60 62 64 65 66 67 68 69 76 77 83 90 91 47 49 22 725 20 7 33 218 M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 15/23 ... 15/23
  15. 15. . Simulation Setup • simple GroupConnect : one Master node, all other nodes are used for delegation • the paced and greedy models • Internet speeds randomly selected from real LTE/3G dataset (above) • download between 100k and 100M files M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 16/23 ... 16/23
  16. 16. . Simulation Results 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5 Throughput for Paced model ( 1 + log( x) for x > 1) 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5 ThroughputforGreedyModel(1+log(y)fory>1) M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 17/23 ... 17/23
  17. 17. . The New Wireless Campus M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 18/23 ... 18/23
  18. 18. . University Campus : Objectives • universities create their own WiFi hotspot networks, which are useless (contention problem) • GroupConnect is a possiblity of converged wireless campus based entirely on students' own Internet connections • Univ COOPs provide smartphone apps, management rules, rent smartphones, etc. M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 19/23 ... 19/23
  19. 19. . University Campus : Prototype • (1) Univ COOP makes the app, adds security, (2) distributes the app to students, (3) GroupConnect management, (4) cloud services over GroupConnect Student Develop, make secure APP + CODE Campus Another Student APP + CODE APP + CODE 1 2 2 Distribute 3 Meet and delegate API Tokens API Tokens Distribute Pass at delegation University 4 M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 20/23 ... 20/23
  20. 20. . University Campus and Clouds • API tokens in cloud services can be shared via delegation Student Develop, make secure APP + CODE Campus Another Student APP + CODE APP + CODE 1 2 2 Distribute 3 Meet and delegate API Tokens API Tokens Distribute Pass at delegation University 4 M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 21/23 ... 21/23
  21. 21. . Field Tests : CloudCamp2014@天神 http://cloudcampreps.herokuapp.com/ M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 22/23 ... 22/23
  22. 22. . That’s all, thank you ... M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 23/23 ... 23/23

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