1. Simulation Scenario for Unplanned Wi-Fi Network
May 2013
doc.: IEEE /xxxxr0
Sept. 2013
Simulation Scenario for Unplanned Wi-Fi Network
Date:
Authors:
Name
Affiliations
Address
Phone
Minho Cheong
ETRI
161 Gajeong-dong, Yuseong-Gu, Daejoen, Korea
Jae Seung Lee
Hyoung Jin Kwon
Sok-Kyu Lee
Minho Cheong (ETRI)
Osama Aboul-Magd (Huawei Technologies)

2. Sept. 2013
Abstract
This presentation gives set of issues in designing simulation scenario for unplanned Wi-Fi network.
Minho Cheong (ETRI)

3. Structure of Simulation Scenario for HEW [4]
Sept. 2013
Structure of Simulation Scenario for HEW [4]
Scenario Name
Topology
Management
Channel Model
Homogeneity
~Traffic Model 1
Residential A
(Apartment Bldg)
Unmanaged
Indoor
Flat
Home 2a
Enterprise B
(Dense small BSSs)
Managed 2b
Indoor Hotspot
Mobile 2c
Outdoor Hotspot
Outdoor 3a
Outdoor Large BSS C
(Large BSSs) 3b
+ Residential
C+A
Managed+ Unmanaged
Hierarchical
Mobile + Home 3c
+ Outdoor Hotspot
C+B
Observation in terms of unplanned Wi-Fi
Coupling between planned and unplanned is just at macro-level
Only residential is considered as unplanned
Random positioning applied only by which we cannot model the realistic environments
Minho Cheong (ETRI)

4. Characteristics of Unplanned Wi-Fi
Sept. 2013
Characteristics of Unplanned Wi-Fi
In all cases
(1) Unexpected position
Position of each AP is at customer’s own. Nobody knows.
(2) Unexpected active-time
Turn-on/turn-off of the AP is hardly expectable
(3) Unexpected increase in deployment
Nobody knows who newly installed AP’s in the neighborhood
(4) Uncontrollable
Wi-Fi controller cannot touch
Many low-featured AP cannot even decode the high-featured signaling
(5) Including low-featured AP’s
Most people still hesitate to buy high featured ones as private AP’s
Minho Cheong (ETRI)

5. Characteristics of Unplanned Wi-Fi
Sept. 2013
Characteristics of Unplanned Wi-Fi
In worst cases, additionally
(6) Invisible
AP’s SSID hidden while existing by customer’s setting
(7) Moving
Tethering devices (soft AP) can be moving
Minho Cheong (ETRI)

6. Importance of Unplanned Scenario in HEW
Sept. 2013
Importance of Unplanned Scenario in HEW
Crucial reason why current Wi-Fi is so degraded
Almost 100% of Wi-Fi environments in the real world are affected
Purely planned Wi-Fi scenario hardly exists
There are no remote & safe Wi-Fi zone without any private AP
It is hardly possible to exterminate private AP’s even in a well-planned Wi-Fi environment
This is the very environments under which HEW tries to put its major effort to enhance the network performance
Minho Cheong (ETRI)

7. Importance of Unplanned Scenario in HEW
Sept. 2013
Importance of Unplanned Scenario in HEW
Unplanned Wi-Fi exists everywhere as significant
Not only in the residential environments
Example #1 (indoor hot spot)
Measurement done at an underground mall (COEX in Seoul)
44 % of all the detected AP’s near by are private AP’s
Per-STA AVG. throughput is only 3.7Kbps mainly due to private AP’s
While 11b/11g/11n can support max. PHY 11Mbps/54Mbps/600Mbps
Minho Cheong (ETRI)

8. Importance of Unplanned Scenario in HEW
Sept. 2013
Importance of Unplanned Scenario in HEW
Unplanned Wi-Fi exists everywhere as significant
Not only in the residential environments
Example #2 (outdoor hot spot)
Measurement done at a train station (KTX station in Seoul)
18 % of all the detected AP’s near by are private AP’s
Per-STA AVG. th’put is only 13.2 Kbps mainly due to private AP’s
While 11b/11g/11n can support max. PHY 11Mbps/54Mbps/600Mbps
Minho Cheong (ETRI)

9. What We Expect from Unplanned Scenario
Sept. 2013
What We Expect from Unplanned Scenario
First, we want to check the network performance of real-world unplanned Wi-Fi network itself
Second, we really want to check the impact of unplanned Wi-Fi AP(s) which permeate the well-planned network on it
In order to quantitatively check how much degraded the network performance goes when one or limited number of bad guys (private AP’s) are talking in the network
In order to quantitatively check how much gain we can achieve when some suggested technology (PHY or MAC) applied to the high-featured AP’s (connected to Wi-Fi controller) in the original well-planned network with small number of private AP’s
Minho Cheong (ETRI)

10. How to Design Unplanned Scenario
Sept. 2013
How to Design Unplanned Scenario
Coupling at micro-level or at macro-level?
When coupling with a well-planned Wi-Fi network to find out impact of unplanned Wi-Fi
(1) Coupling at macro-level
Multi-BSS unplanned Wi-Fi “network” + planned network
Only assuming that an apartment building is near by a football stadium
(2) Coupling at micro-level
Each private Wi-Fi AP permeates a planned network
Assuming that individual private AP may exists even in the planned
It seems that coupling with a planned network at micro-level is more realistic and more matched to the purpose of HEW
We need to define derived scenarios from the original planned one by introducing some private AP’s in it.
Minho Cheong (ETRI)

11. How to Design Unplanned Scenario
Sept. 2013
How to Design Unplanned Scenario
AP’s with the same age or different ages?
In a well-planned network, all the AP’s are usually provided at one time by one provider so that all the AP’s are in the same generation
e.g. our library Wi-Fi network has only n AP’s in it
But, unplanned Wi-Fi is likely to have several generations of AP’s in the neighborhood
So, my n AP doesn’t work so well due to neighbor’s 11b AP
So, we need to allow several generations of AP’s in designing of unplanned Wi-Fi
Minho Cheong (ETRI)

12. 2) Unmanaged (Managed+private AP’s)
Sept. 2013
Suggestion
2 levels of coupling with unplanned Wi-Fi
Red-colored (at micro-level) & blue-colored (at macro-level)
Multi-generations of private AP’s applied (colored green)
Scenario Name
Topology
Management
Private AP modeling
Channel Model
Homogeneity
~Traffic Model
Location
Generation 1
Residential A
(Apartment Bldg.)
Unmanaged
Random within unit
Multi-Gen.
(11b/11g/11n: 2.4GHz)
(11a/11n/11ac: 5GHz)
Indoor
Flat
Home 2a
Enterprise B
(Dense small BSSs)
1) Managed
2) Unmanaged (Managed+private AP’s)
Random globally 2b
Indoor Hotspot
Mobile 2c
Outdoor Hotspot
Outdoor 3a
Outdoor Large BSS C
(Large BSSs) 3b
+ Residential
C+A
Managed+ Unmanaged
Hierarchical
Mobile + Home 3c
+ Outdoor Hotspot
C+B
Minho Cheong (ETRI)

13. References [1] 11-03-0802-23-000n-usage-models
March 2012
doc.: IEEE /0330r0
Sept. 2013
References
[1] n-usage-models
[2] hew-HEW-functional-requirements-follow-up
[3] hew-wi-fi-interference-measurements-in-korea
[4] hew-simulation-scenarios
Minho Cheong (ETRI)
Wookbong Lee, LG Electronics