Group Connect in a New Wireless University Campus

.
Wireless Contention Problem
M.Zhanikeev -- maratishe@gmail.com -- Group Connect is a New Wireless University Campus -- http://bit.do/marat140731 2/23
...
2/23

.
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
...
3/23

.
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
...
4/23

.
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
...
5/23

.
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)
...
6/23

.
Solution (1) MultiConnect
...
7/23

.
Parallel Wireless Connectivity
...
8/23

.
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
...
9/23

.
Solution (2) GroupConnect
...
10/23

.
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, ...
...
11/23

.
Group Connect: Task Delegation
Remote connectivity
Local Connectivity
Content Provider
Main
Client
Delegated
Client
Delegated
Client
3G/LTE/*
Access 3G/LTE/*
Access
...
12/23

.
Trace-Based Analysis
...
13/23

.
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
...
14/23

.
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
...
15/23

.
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
...
16/23

.
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)
...
17/23

.
The New Wireless Campus
...
18/23

.
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.
...
19/23

.
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
...
20/23

.
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
...
21/23

.
Field Tests : CloudCamp2014＠天神
http://cloudcampreps.herokuapp.com/
...
22/23

.
That’s all, thank you ...
...
23/23

Group Connect in a New Wireless University Campus

Recommandé

Recommandé

Contenu connexe

Similaire à Group Connect in a New Wireless University Campus

Similaire à Group Connect in a New Wireless University Campus (20)

Plus de Tokyo University of Science

Plus de Tokyo University of Science (20)

Dernier

Dernier (20)

Group Connect in a New Wireless University Campus