doc.: ieee 802.11-04-680/r1 submission telinfos, hansung univ., rrl july, 2004 slide 1 wlan mesh...

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


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


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


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


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


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


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


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



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



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



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



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


Key management

Omin or Directional

antenna


SupportHigh Speed

Mobility,Network

Reliability

1,2,5,6,9,10,11,13,18,21,31,43

No Usually No


Key management

Omin or Directional

antenna


Seamless connectivity

Use Model Characteristics(2)Use Model Characteristics(2)

July, 2004

Slide 13

doc.: IEEE 802.11-04-680/r1


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


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


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


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


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



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



• 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



• 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


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

doc.: ieee 802.11-04-680/r1 submission telinfos, hansung univ., rrl july, 2004 slide 1 wlan mesh...

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