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July, 2004
Slide 1
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
WLAN Mesh WLAN Mesh Usage Model and Considerations Usage Model and Considerations
for Hot Spotfor Hot Spot Service Service
Taejin Lee(Telinfos), Jongtaek Oh(Hansung Univ.), Sukhee Bae(RRL), Jaewoo Lim(RRL)
2004. 7
July, 2004
Slide 2
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Contents
• First
• The status of Hot Spot Service in Korea
• Considerations for Hot Spot Service
• Addition of Usage Model for Hot Spot
• Considerations of WLAN mesh for Hot Spot
• Next Step
July, 2004
Slide 3
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
First
• We have much interest on WLAN Mesh,
• and, we think WLAN Mesh has very important
role to extend the coverage of Hot Spot service.
• We hope that our suggestion would be helpful to
develop the WLAN Mesh standard,
• and, we support the standardization process with
the usage model.
July, 2004
Slide 4
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
The Status of Hot Spot service in Korea(cont.)
• No. of Hot Spot Site in Korea: about 13,000 Sites (by the end of 2003)– Major service providers have the sites over 90%.– Total amount would be about 50% to Worldwide market.
• Service Site– University– Bank– Restaurant– Hotel– Hospital, Young Street, etc.
• Service Fee : about $10~$50 per month
July, 2004
Slide 5
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
The Status of Hot Spot service in Korea
• Service Traffic– Down link: 2.93Mbps, Up link: 1.42Mbps(average rate)
– RTT : 24.66m, Loss rate : 0.02% (from www.benchbee.co.kr)
• Client Terminals & Service Categories– Family : 1 to multi PCs in home & Hot Spot
– Solo : Fully Wireless Internet Connection
– Biz : Wireless SI for Biz
– Pop : Hot Spot Service
– Swing : Hot Spot & Mobile Phone
• Subscribers: 337,000 (2003.9)– Forecast 1,000,000 sub., 16,000 hot spots
(2004 year)
July, 2004
Slide 6
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Considerations of Hot Spot Service• Easy installation
– Appropriate coverage– Installation criteria : bps/user, bps/area
• Deployment cost– AP cost– Backbone cost– Site lease cost
• Management cost– Repair cost– Accessory cost (Electric rate)
802.11 802.11 ESS Mesh has the strong point for the above considerations.ESS Mesh has the strong point for the above considerations.
July, 2004
Slide 7
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
The gravity of P2P Traffic • BISP statistics
– P2P Traffic Portion
23:00 Down Up Total
HTTP 29.82% 8.97% 24.85%
P2P 30.55% 51.41% 35.52%
VOD 3.93% 0.41% 3.09%
FTP 4.23% 0.43% 3.32%
Mail 0.01% 0.03% 0.02%
All Others
31.46% 38.75% 33.20%
Busy Hour TimeBusy Hour Time Average DistributionsAverage Distributions
Total Down Up Total
HTTP 32.37% 8.43% 25.73%
P2P 27.97% 49.60% 33.97%
VOD 2.72% 0.22% 2.03%
FTP 2.73% 1.79% 2.47%
Mail 0.03% 0.05% 0.04%
All Others
34.18% 39.91% 35.77%
P2P Traffic is important traffic and increasing as time goes on P2P Traffic is important traffic and increasing as time goes on
* Study of using frequency for HPI and mobile communication,RAPA, 2003
July, 2004
Slide 8
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Addition of Usage Model(1)
NumberApplicati
on
Offered
Load
(Mbps)
ProtocolMSDU
Size
(B)
Maximum
E2E PLR
Maximum
E2E Delay
(ms)
Source
[ref]
22 P2P0.7~10
(based on xDSL)
TCP < 512 n/a n/a RFC791
ApplicationsApplications
Use CasesUse Cases
Number Use Case Application
Typical
Environment
(not exclusive)
Both Application
Endpoints within the WLAN
Mesh?
43P2P Communication
Using emulation program(ex: e-donkey)
Peer to Peer Sharing
MP3, Video(Divx, mpg..) files
Residential,
Hot Spot – indoor & outdoor
Usually no
July, 2004
Slide 9
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Addition of Usage Model(2)
Use ModelsUse Models
Number
Usage
Model
Category
Usage
Model
Name
Description of Usage Model Sample Topology
20 Hot SpotMain
Street
While wireline backbone is relatively difficult and inflexible and expensive to deploy for a large area, WLAN mesh backhaul becomes cost effective deployment . WLAN have sporadic hot-spot coverage in offices, cafes, train stations, etc. Distributed relaying potentially increases capacity at WLAN cell edges and closes coverage holes in sufficiently dense deployment areas. Also, service area expansion and shadow area reduction by mesh network.
Mesh AP Portal Mesh AP Mesh AP Mesh APInternetInternet
Leased Line/Metro Ethernet
or xDSL
PDA
PDAPDA
50~100m
July, 2004
Slide 10
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Addition of Usage Model(3)
Number
Usage
Model
Category
Usage
Model
Name
Description of Usage Model Sample Topology
20 Hot Spot
SubwayFor vehicles moving along the
fixed route, like subway
Interworking
mobile communication
Interworking with mobile communication network in the hot
spot area
InternetInternet
MESH APMESH AP
MESH AP MESH APMESH AP
MESH AP
MESH Portal
20m
Mobile worker
with Notebook PC,PDA
Mesh AP
The Internet
FixedLine
1x, EV-DO
Hot Spot Hot Spot CDMACDMA
Hot Spot ISP Mobile Carrier
CDMA Base
Station
Mesh AP
July, 2004
Slide 11
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Addition of Usage Model(4)
Use Model Characteristics(1)Use Model Characteristics(1)
Usage
Model
#
Usage
Model
Category
Usage
Model
Name
Deployment Characteristics
Total
# Mesh APs/
Points
Mesh Physical
Topology
(Physical Area Size/Shape, Include Sample Topology
Map)
Mesh
Deployment
Environment
Mesh AP/Point Mobility
Mesh AP/Point Join/Exit
Frequency
# Mesh APs/Points
with Portals to Other
LANs
#
STAs
STA
Distribution
STA
mobility
20Hot Spot
Main
Street
Small
4~5
Approx.
500m^2
Indoor/
OutdoorHigh High 1 20
SubwaySmall
10
Approx.
200m x 50m
(train length about 20m)
Outdoor High High 1 50
Inter
working
Mobile
Communication
Small
4~5
Approx.
500m^2
Indoor/
OutdoorHigh High 1 20
July, 2004
Slide 12
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Addition of Usage Model(5)
Traffic Characteristics
Unique
Security
Requirements/
Characteristics
Unique Mesh AP/Mesh Point
Device
Characteristics
(e.g. power antenna, .etc)
Management and
Configuration of WLAN Mesh(Self configuration or
Managed)
Motivations for WLAN
Deployment
Comment
Use Cases
(including Applications)
Mesh APs/points
may be Application End-Points?
Both application
End-Points commonly within the
WLAN Mesh
2,5,6,9,10,11,13,18,21,31,43
No Usually No
Center orDistributed
Key management
Omin or Directional
antenna
Self configuration(?)
Networkreliability,
Low deployment
Cost
2,5,6,9,10,11,13,18,21,31,43
No Usually No
Center orDistributed
Key management
Omin or Directional
antenna
Self configuration(?)
SupportHigh Speed
Mobility,Network
Reliability
1,2,5,6,9,10,11,13,18,21,31,43
No Usually No
Center orDistributed
Key management
Omin or Directional
antenna
Self configuration(?)
Seamless connectivity
Use Model Characteristics(2)Use Model Characteristics(2)
July, 2004
Slide 13
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Sample Topology for Hot SpotMain StreetMain Street
Mesh AP Portal Mesh AP Mesh AP Mesh AP
InternetInternet
Leased Line/Metro Ethernet
or xDSL
PDA
PDA PDA
50~100m
July, 2004
Slide 14
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Sample Topology for Hot SpotMain Street SmallMain Street Small
Main Street LargeMain Street Large
50~100m
Mesh AP Portal Mesh AP
400~800m
400~800m
Lack of non interference frequency?
f3 f2 f1 f3
f1 f3 f2 f1
f2 f1 f3 f2
For example :
x2 ?
July, 2004
Slide 15
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Sample Topology for Hot SpotSubwaySubway
InternetInternet
MESH APMESH APMESH AP MESH APMESH APMESH AP
MESH Portal
20m
July, 2004
Slide 16
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Sample Topology for Hot SpotInterworking mobile communicationInterworking mobile communication
Mobile worker with Notebook
PC,PDA
Mesh AP
The Internet
FixedLine
1x, EV-DO
Hot Spot Hot Spot CDMACDMA
Hot Spot ISP Mobile Carrier
CDMA Base Station
Mesh AP
July, 2004
Slide 17
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Considerations of WLAN mesh for Hot Spot(1)
f1
f2 f2
f2f2
f2
f1
f1
IP networkMetro EthernetOr DSL
DHCP NMS AAA
CP
Other ISP AP
July, 2004
Slide 18
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Considerations of WLAN mesh for Hot Spot(2)
f1
f2 f2
f2f2
f1
f1
IP networkMetro EthernetOr DSL
DHCP NMS AAA
CP
f2’
July, 2004
Slide 19
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Considerations of WLAN mesh for Hot Spot(3)
• Multi radio Mesh AP– F1 Frequency Band(NWA) : 2.4GHz, 5.15~5.35GHz,
5.460~5.725GHz
– F2 Frequency Band(FWA/WDS) : 5.725~5.825GHz (4W EIRP available)
– F1 Throughput : <54Mbps, F2 Throughput :>54Mbps
• DFS Function– If the interference of F1 increases, then it changes to
dynamic channel.
July, 2004
Slide 20
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Considerations of WLAN mesh for Hot Spot(4)
• Mesh Link Traffic– Mesh Link should not decrease the throughput due to
sub-network traffic.– Therefore it needs 802.11 ESS mesh APs with Multi
radio.– Mesh AP will be required the high performance(increase
cost).
• Interference – Interference decrease the throughput.– Need such as DFS Algorithm or new algorithm– DFS function needs that F2 section is prior to F1 section.
July, 2004
Slide 21
doc.: IEEE 802.11-04-680/r1
Submission Telinfos, Hansung Univ., RRL
Next Step
• Support of usage model for Hot Spot
– Classification of detail Category
• Main street, Subway, Interworking mobile communication etc
– Analysis of P2P traffic
• Determination parameter
– Study of Sample Topology and usage model characteristics
• Make the proper sample topology and define the characteristics
• Offer hot spot ISP’s help