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					July, 2004                                                    doc.: IEEE 802.11-04/




              WLAN Mesh
    Usage Model and Considerations
          for Hot Spot Service


             Taejin Lee(Broadwave), Jongtaek Oh(Hansung Univ.),
                     Sukhee Bae(RRL), Jaewoo Lim(RRL)
                                  2004. 7




Submission                        Slide 1                Broadwave, Hansung Univ., RRL
July, 2004                                    doc.: IEEE 802.11-04/



                     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

Submission               Slide 2         Broadwave, Hansung Univ., RRL
July, 2004                                      doc.: IEEE 802.11-04/



                           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.


Submission                  Slide 3        Broadwave, Hansung Univ., RRL
July, 2004                                         doc.: IEEE 802.11-04/



 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
Submission                          Slide 4   Broadwave, Hansung Univ., RRL
July, 2004                                                     doc.: IEEE 802.11-04/



        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)

Submission                             Slide 5            Broadwave, Hansung Univ., RRL
   July, 2004                                                 doc.: IEEE 802.11-04/



            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 ESS Mesh has the strong point for the above considerations.
   Submission                        Slide 6             Broadwave, Hansung Univ., RRL
July, 2004                                                                           doc.: IEEE 802.11-04/



                       The gravity of P2P Traffic
 • BISP statistics
       – P2P Traffic Portion
       Busy Hour Time                                       Average Distributions
             23:00      Down          Up        Total         Total      Down          Up        Total
             HTTP       29.82%      8.97%      24.85%         HTTP       32.37%      8.43%       25.73%

             P2P        30.55%      51.41%     35.52%          P2P       27.97%      49.60%      33.97%

             VOD        3.93%       0.41%       3.09%         VOD         2.72%      0.22%       2.03%

             FTP        4.23%       0.43%       3.32%          FTP        2.73%      1.79%       2.47%

             Mail       0.01%       0.03%       0.02%          Mail       0.03%      0.05%       0.04%
          All                                                  All
                        31.46%      38.75%     33.20%                    34.18%      39.91%      35.77%
         Others                                               Others

               P2P Traffic is important traffic and increasing as time goes on
                     * Study of using frequency for HPI and mobile communication,RAPA, 2003
Submission                                           Slide 7                   Broadwave, Hansung Univ., RRL
  July, 2004                                                                 doc.: IEEE 802.11-04/



                   Addition of Usage Model(1)
  Applications
                           Offered                    MSDU                   Maximum
               Applicati                                       Maximum                       Source
Number                      Load       Protocol        Size                  E2E Delay
                 on                                            E2E PLR                        [ref]
                           (Mbps)                      (B)                     (ms)
                             0.7~10
   22            P2P       (based on    TCP            < 512     n/a              n/a        RFC791
                             xDSL)

       Use Cases
                                                                   Typical         Both Application
Number              Use Case                Application          Environment       Endpoints within
                                                                                     the WLAN
                                                                (not exclusive)         Mesh?
                                                                 Residential,
               P2P Communication        Peer to Peer Sharing
  43                                                             Hot Spot –             Usually no
                 Using emulation         MP3, Video(Divx,
                                                                  indoor &
              program(ex: e-donkey)          mpg..) files
                                                                   outdoor
 Submission                                       Slide 8               Broadwave, Hansung Univ., RRL
 July, 2004                                                                                       doc.: IEEE 802.11-04/



                    Addition of Usage Model(2)
     Use Models
         Usage       Usage
Num
         Model       Model       Description of Usage Model                                     Sample Topology
ber
        Category     Name


                              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-                                                                Mesh AP         Mesh AP

                     Main     spot coverage in offices, cafes, train
                                                                                    Internet     Mesh AP Portal   Mesh AP



20       Hot Spot                                                           Leased Line


                     Street   stations, etc. Distributed relaying         /Metro Ethernet
                                                                             or xDSL
                                                                                                                            PDA
                                                                                                                                            PDA


                              potentially increases capacity at WLAN                                     PDA



                              cell edges and closes coverage holes in
                              sufficiently dense deployment areas.                             50~100m



                              Also, service area expansion and shadow
                              area reduction by mesh network.


 Submission                                     Slide 9                            Broadwave, Hansung Univ., RRL
 July, 2004                                                                                    doc.: IEEE 802.11-04/



                   Addition of Usage Model(3)
        Usage       Usage
Num
        Model       Model        Description of Usage Model                           Sample Topology
ber
       Category     Name



                                                                       Internet


                                For vehicles moving along the
                    Subway                                                                                                                      MES
                                                                                                                                                H

                                   fixed route, like subway                                                                                     Porta
                                                                                                                                                l



                                                                                MESH AP                                           MESH AP
                                                                                                                                                  MESH AP
                                                                                               MESH AP   MESH AP     MESH AP




                                                                        2
                                                                        0
                                                                        m

20      Hot Spot

                    Interwo                                                       Hot Spot                                        CDMA


                     rking        Interworking with mobile                      Hot Spot ISP                                   Mobile Carrier

                                                                                                                         1x, EV-DO
                                                                                                 Fixed
                     mobile    communication network in the hot                                  Line       The
                                                                                                          Internet
                                                                                       Mesh AP
                    commu                 spot area                 Mobile
                                                                  worker with
                                                                                                                         CDMA Base
                                                                                                                           Station
                                                                   Notebook
                    nication                                       PC,PDA

                                                                                                   Mesh AP




 Submission                                  Slide 10                             Broadwave, Hansung Univ., RRL
      July, 2004                                                                                        doc.: IEEE 802.11-04/



                         Addition of Usage Model(4)
        Use Model Characteristics(1)
                                                                 Deployment Characteristics
         Usage                            Mesh Physical
Usage               Usage                                                                              # Mesh
         Model                 Total        Topology            Mesh                     Mesh
Model               Model                                                   Mesh                     APs/Points      #     STA     STA
         Catego               # Mesh     (Physical Area                                AP/Point
  #                 Name                                     Deployment    AP/Point                  with Portals   STA   Distri   mobi
           ry                  APs/    Size/Shape, Include                             Join/Exit
                                                             Environment   Mobility                   to Other       s    bution   lity
                              Points    Sample Topology                               Frequency
                                                                                                        LANs
                                              Map)


                    Main      Small        Approx.            Indoor/
                                                                            High        High              1         20
                    Street     4~5         500m^2             Outdoor


                                            Approx.
                              Small      200m x 50m
          Hot      Subway                                     Outdoor       High        High              1         50
 20                            10        (train length
          Spot
                                          about 20m)
                    Inter
                   working
                              Small        Approx.            Indoor/
                   Mobile                                                   High        High              1         20
                               4~5         500m^2             Outdoor
                   Commu
                   nication
      Submission                                               Slide 11                            Broadwave, Hansung Univ., RRL
     July, 2004                                                                                               doc.: IEEE 802.11-04/



                              Addition of Usage Model(5)
     Use Model Characteristics(2)
                Traffic Characteristics
                                                                             Unique Mesh
                                                       Unique               AP/Mesh Point        Management and
                                         Both
                       Mesh           application                                Device          Configuration of    Motivations for
                                                      Security                                                                          Com
 Use Cases           APs/points                                                                  WLAN Mesh(Self         WLAN
                                      End-Points    Requirements/           Characteristics                                             ment
 (including           may be                                                                     configuration or     Deployment
                    Application        commonly     Characteristics      (e.g. power antenna,
Applications)                                                                                       Managed)
                    End-Points?        within the                                 .etc)
                                      WLAN Mesh
                                                                                                                       Network
2,5,6,9,10,                                          Center or                                                        reliability,
                                                                             Omin or            Self configuration
 11,13,18,              No            Usually No    Distributed             Directional                                  Low
                                                        Key                  antenna                    (?)          deployment
 21,31,43                                           management
                                                                                                                         Cost
                                                                                                                      Support
2,5,6,9,10,                                          Center or                                                       High Speed
                                                                             Omin or            Self configuration
 11,13,18,              No            Usually No    Distributed             Directional                               Mobility,
                                                        Key                  antenna                    (?)
 21,31,43                                           management                                                        Network
                                                                                                                     Reliability

1,2,5,6,9,10,                                        Center or
                                                                             Omin or            Self configuration    Seamless
  11,13,18,             No            Usually No    Distributed             Directional
                                                        Key                  antenna                    (?)          connectivity
  21,31,43                                          management

    Submission                                                        Slide 12                          Broadwave, Hansung Univ., RRL
        July, 2004                                                          doc.: IEEE 802.11-04/



                      Sample Topology for Hot Spot
                  Main Street


       Internet

  Leased Line
                       Mesh AP Portal   Mesh AP              Mesh AP                  Mesh AP
/Metro Ethernet
   or xDSL



                                                                          PDA
                                                       PDA

                                PDA




                     50~100m


        Submission                                Slide 13             Broadwave, Hansung Univ., RRL
July, 2004                                                         doc.: IEEE 802.11-04/



             Sample Topology for Hot Spot
 Main Street Small

     Mesh AP Portal   Mesh AP




         50~100m
                                400~800m
 Main Street Large
                                Lack of non interference frequency?
                                               For example :
                                400~800m      f3   f2   f1   f3
                                              f1   f3   f2   f1   x2 ?
                                              f2   f1   f3   f2


Submission                         Slide 14                   Broadwave, Hansung Univ., RRL
July, 2004                                                    doc.: IEEE 802.11-04/



               Sample Topology for Hot Spot
             Subway




        Internet

                                                                              MESH Portal




               MESH AP   MESH AP   MESH AP     MESH AP         MESH AP
                                                                                  MESH AP




        20m
Submission                          Slide 15             Broadwave, Hansung Univ., RRL
July, 2004                                                     doc.: IEEE 802.11-04/



             Sample Topology for Hot Spot
  Interworking mobile communication



              Hot Spot                                    CDMA
             Hot Spot ISP                              Mobile Carrier

                                                   1x, EV-DO
                            Fixed
                            Line
                                    The Internet
                    Mesh AP
Mobile worker                                      CDMA Base
with Notebook                                        Station
   PC,PDA




                              Mesh AP
Submission                              Slide 16          Broadwave, Hansung Univ., RRL
July, 2004                                    doc.: IEEE 802.11-04/



Considerations of WLAN mesh for Hot Spot(1)
                                                      DHCP NMS AAA



                       Metro Ethernet
                                           IP network
                       Or DSL


              f2               f2

                                                 f1
        f1                                                               CP
                       f2
               f2
                                    f2

                                             Other ISP AP
                        f1

Submission          Slide 17             Broadwave, Hansung Univ., RRL
July, 2004                                     doc.: IEEE 802.11-04/



Considerations of WLAN mesh for Hot Spot(2)
                                                       DHCP NMS AAA



                       Metro Ethernet
                                            IP network
                       Or DSL


              f2               f2

                                                  f1
        f1                                                                CP
                       f2
               f2
                                    f2’


                        f1

Submission          Slide 18              Broadwave, Hansung Univ., RRL
July, 2004                                              doc.: IEEE 802.11-04/



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(5GHz not allocated in Korea, but
         anticipated by 2004, Q3)
       – 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.


Submission                       Slide 19          Broadwave, Hansung Univ., RRL
July, 2004                                            doc.: IEEE 802.11-04/



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.

Submission                      Slide 20         Broadwave, Hansung Univ., RRL
July, 2004                                                     doc.: IEEE 802.11-04/



                                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


Submission                             Slide 21           Broadwave, Hansung Univ., RRL

				
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