Wireless Lan (PDF) by liuhongmei

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    Wireless Lan


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Beratung, eine kostenlose Teststellung oder
          weitere Informationen?

         kh.hoeschen@xnc.com
           Tel.: 02203 – 96960
          Mobil: 0174 - 9222144

                 XNC GmbH
             Auf der Kaiserbitz 3
                D-51147 Köln
         Amtsgericht Köln HRB 25563
       Geschäftsführer Frank Bergknecht
Installationen mit Meru’s
WLAN System
Meru Überblick
x   Meru zielt auf zwei der derzeit am stärksten
    IT Wachstumsmärkte —VoIP and Wireless

x   Innovative Technologie
     q   Eliminiert die derzeit komplexe RF Planung
     q   High performance, High density (Leistung und Dichte)
     q   Liefert High-Quality wireless VoIP

x   Industrielle Auszeichungen
Die Industrie sieht derzeit Meru als
Branchenführer!
 WLAN Architektur Evolution
                                            Aruba, Trapeze,
                 “Stand Alone” or           Extreme, Airespace              “Intelligent &
                     “Fat” AP                    “Thin” AP                Coordinated” Edge




                                               WLAN Switch                      WLAN Switch
                     LAN Switch
                                                                                 / Controller


Architecture       Stand Alone APs,         Centralized Intelligence     Overlay WLAN Network,
               Centralized or Distributed                                Distributed Intelligence,
                     Management                                            Centralized Control

Benefits       Simple Implementation for      Scaleable, Central        RF Coordination, Over-the-
                  a Few Access Points,           Management            Air QoS, Simple Deployment,
                Centralized Management                                    Scaleable, Management

Target          SOHO, Medium & Large           Medium & Large             Large Scale Enterprise
Markets              Enterprise                  Enterprise
2005 – Unstrung Insider:
Enterprise VOIP Mobility Leadership
                                As of August, 2005
5 Top Equipment Makers Pick Meru for
Wireless VoIP Solution
  VoIP Server           Wireless LAN                   Handsets




                +                              +
                                                             Cellular/Wi-Fi
                                                   Wi-Fi     Dual-mode



                            +
                                                   Handset   Handset


                    Wireless / VoIP Security
Meru’s Unique Solution Advantages
Compared to Extreme’s WLAN
 Better WLAN Performance
   •   Predictable, fair service to all clients
   •   Higher performance in dense user environments
   •   Higher performance in mixed-mode 802.11b & 802.11g clients

 Easy Deployment
   •   Co-channel Interference Management
   •   Reduced RF planning

 Better Mobility/Roaming
   •   Zero Handoff vs. Slow Handoff

 Better QoS / VoWLAN Support
   •   Over-the-air upstream and downstream QoS
   •   Automatic voice flow detection (SIP, H323, SVP, SCCP)
   •   Advanced Call-Admission Control, call load-balancing
       and dynamic error correction capabilities
Meru Differentiation:
Air Traffic Control (ATC)

                                Functionality             Benefits
                            Centralized Control
                                                           Contention
                            -   Global Policies
                            -   Global Coordination       Management
                            -   Central RF Intelligence
                            -   App Flow Inspection

                            AP Intelligence               Co-Channel
                            - QoS Flow Recognition        Management
                            - Application Detection
                            - Local RF Coordination
                            - Admission Control
                                                           Jitter and
                            ATC MAC                       Bandwidth
                            - Local Governance            Management
                            - Scheduling
                            - Virtual MAC for Clients
                            - 802.11 Control
                                                          Zero Handoff
          Voice
          Client


                       Performed in Controller

                       Performed in the Access Point
          Air Traffic Control Technology
          More Bandwidth For More Users


                                       Peak Aggregate Throughput                    Active Users Per AP

                                                                                                100+
Total Bandwidth at Peak




                               11

                                   8                                  Meru AP
                                                                      Performance

                                   5
                          (Mbps)




                                                     Contention
                                                       Loss
                                                                                     20-25
                                       Today’s AP
                                         (others)
                                   1   Performance
                                          3                   20-25
                                                                                    Others      Meru
                                          Number of Active Users
Air Traffic Control Technology :
More Voice Calls

                                    Standards-based
      over-the-air                    Over-the-Air
         QoS                Wired        QoS
                     AP                                       Wired
                            QoS                          AP   QoS

                                                ~High

                                                 Voice
                                                 Quality

                                               MOS Score
             ~Low                                 4.0+



            AP+ Switch                         Meru AP &
          standard Client                   Standard Client


    Data and voice typically on      Converged Network - voice
    Separate channels/network        and data on same channels
      Air Traffic Control Technology
      Service Fairness

Throughput   Standard AP’s + 20 Clients             Throughput   1 Meru AP + 20 Clients




              x   Industry leading aggregate throughput at density
              x   Predictable, uniformly fair throughput across all
                  clients
                   q   Other AP’s erratic, unfair access over short term
                       intervals
Air Traffic Control Technology
Zero Loss Handoff


         Other WLAN                   Meru WLAN

                                Virtual Cell Architecture

      BSSID = A   BSSID = B       BSSID = M   BSSID = M




                       01:00                       00:00


100ms – 2 sec between handoff   No Handoff For Client
How Over-the-Air QoS Compares

                                                                Meru
                                      “Others”
                                                         Air Traffic Control

    Global RF Knowledge and
                                          --                     Yes
    Inter-cell Coordination


    Application Flow Detection   Static ESSID-based or
                                                            Yes (Dynamic)
    and Classification                   Filters


    Admission Control                     --                     Yes

                                  Simple Priority of      Reservation-based
    Downlink (AP to Client)
                                      packets            True over-the air QoS

                                                          Reservation-based
    Uplink (Client to AP)                 --
                                                         True over-the air QoS
Voice Services Module Further Improves
Users Experience

 x Consists   of the following components:
   q   Call Admission Control
   q   Call Load Balancing
   q   Dynamic Error Correction
Call Admission Control

 x Enables administrator to configure
   system to allow a given number of
   active calls
 x Upon reaching limit, call can either be
   rejected with Network Busy (similar to
   PSTN) or can be moved to alternate
   channel that has available resources
Call Load Balancing
 x   System can perform balancing of the data/voice
     devices across multi-channel deployments in dense
     networks.
 x   Dynamically re-balance phones during call setup to
     achieve peak call density in an area (3X other
     vendors).
 x   Allows you to paint an area with 3 channels to
     achieve 3X call density allowing you to handle
     common deployment situations where workers
     congregate in a break area or conference room and
     all place calls simultaneously.
Example Load Balancing Within a
VirtualCell

x   After initial assignment,
    AP1: 6 STA, AP2: 3 STA        AP1     Channel 1 VirtualCell     AP2
x   Client signal re-evaluated
    every 1 second and moved
    to strongest AP within the
    VirtualAP.
x   Data rate maximized by
                                        After Periodic Load Balancing
    assigning to AP with
    strongest signal as clients
    roam about.
                                  AP1     Channel 1 VirtualCell     AP2
Example Load Balancing Across two
VirtualCells
                                 Example Settings:
x   After initial assignment,    Max Stations per AP = 7
    AP1: 7 STA, AP2: 3 STA       Max Stations per VirtualAP = 10
    AP3: 4 STA, AP4: 6 STA
x   Within each VirtualAP,
    the client signal is re-
                                AP1     Channel 1 VirtualCell      AP2
    evaluated over time and
    moved to strongest AP
    within the VirtualAP
    (refer to slide 12).




                                        Channel 6 VirtualCell      AP4
                                AP3
Dynamic Error Correction

 x System   monitors voice flow and when
   loss is detected due to outside
   interference, corrects the loss by
   interpolating the voice sample.
 x Preserves voice quality when
   errors/loss occurs.
Dynamic Error Correction
Example

      Voice Signal Without DEC   Voice Signal With DEC




  RTP voice sample lost
Meru Eliminates Trade-Off Between Backward
Compatibility and 802.11g Throughput
Critical in Voice Client (b) + Data Client (g) Deployments

 UDP                         TCP                         TCP
 1g                          1g                          1g +1b
 (with b clients present)    (with b clients present)    g client perf.

               ~22.6                     ~15.8                    ~10.1
                            ~10.3
 ~14.8
                                                        ~3.4

Others          Meru        Others        Meru          Others    Meru


  Source: Meru Lab Tests
 Comparative Results
                                     Meru                                Other Leading AP/WLAN Systems
Density: >3X better                  128 clients/AP                      ~ 15 clients/AP



Fairness:
only product with time fairness




                    UDP (bg mode) 22.6Mbps                               14.8Mbps
Throughput:
50% better in bg    TCP (bg mode) 17.5Mbps                               10.9Mbps
Handoff: 10X – 150X better           2.19ms (in Virtual AP mode)         50ms – 3000ms
                       Spectralink   10 calls/AP; works even with data   8-9 calls/AP in unloaded AP;
                                     clients loaded                      breaks with 2 – 3 data clients
QoS Call Capacity
                      Chariot VoIP   MOS up: 4.22                        MOS up: 1.58            downlink
First truly
                        30 calls     MOS Down: 4.26                      MOS Down: 4.29        kills uplink
converged
                      Convergence    MOS: 4.26                           4 calls did not completedata kills
WLAN
                       6 calls + 6   Data T’put: 5.6Mbps                 2 calls MOS 1.5            voice
                          data
                                                                         Data T’put: 7Mbps
Meru Has Significant Performance Advantage
in Requirements for WLAN Deployments

                                                                                Meru
                    Airespace*        Aruba*       Trapeze*        Meru
                                                                                Advantage


                                                                No Client       50 – 150X
           Open     1000-3000**    1000-3000**    1000-3000**
                                                                Handoff
Handoff
                                                                (2 ms
(ms)
           WPA         2000         8000 – 9000    2000 ms      switchover in   100 – 400X
                                                                backend)

802.11g client
throughput, in
                    10.9 Mbps        7.6 Mbps        10.9        17.5 Mbps        1.5X
presence of b
clients

Density of data
                      ~15-20          ~15-20        ~15-20          128            5X
Clients




 * Magazine Tests
 ** Depends on client card capabilities
Customer Examples
Hyatt Osaka Hotel
Data and Voice Deployment
                                                         Floor 39
                                                                       Managed
                                                                       IP Centrex
                                                         Floor …        Service
                                                                      Provided By
                                                                      VoIP Service
                                                                        Provider
                                                          Floor 5
x   28 Floors + Conference
    Center                   PDAs
                                                          Floor 4

x   Wireless Data access      WiFi
                                                                    WAN
    for guests               Phones
                                                          Floor 3


x   VoWLAN handsets
    for internal staff                           Conference Floor

    communications
                                                      Data Center
x   VoIP carrier providing
    services                          Meru
                                    Controller
University of Miami Hospital
Data Application and Voice


                                                       x   Largest Healthcare system in
                                                           Southeast with 6000 member
                                                           community

                                                       x   Multiple applications – data,
                                                           voice, PDA, medical carts,
                                                           laptops

                                                       x   Meru Benefits:
                                                            q   Ease of deployment
“Meru delivered an easily managed, future-proof             q   Reduced costs
system at a significant cost savings. Its standards-        q   Predictable service with
compliant solution supports Quality of Service for
                                                                over-the-air QoS
real-time applications, single channel operations
for co-channel interference mitigation, and the
ability to seamlessly integrate with our existing
backend infrastructure and security processes.”
- Chris Bogue, IT Director
Meru Selected For World's Largest FMC
Deployments: Validating Meru’s VoIP Wireless
Leadership Position
  x Osaka   Gas: Large Utility
    q   $9B Revenue
    q   50 Offices: 6000+ DoCoMo Dual Mode Phones
    q   Competed with Cisco, NEC and others

  x Large   Construction Company
    q   US$18B annual revenues
    q   Nationwide in Japan, offices in Asia, US, UK
    q   9000+ Dual Mode Phones
Live Shots
Live Shots
Danke / Thank you

								
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