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William Beyda Vice President, Product Development Siemens Enterprise Networks. WiFi Technology. WiFi Times Five: How 802.11g Changes the Mobility Picture. Overview. Wireless LAN Technology Landscape Standards Evolution WiFi Hot Spots Wireless LAN Security Where is WiFi?

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wifi technology

William Beyda

Vice President, Product Development

Siemens Enterprise Networks

WiFi Technology

WiFi Times Five: How 802.11g Changes the Mobility Picture

  • Wireless LAN Technology Landscape
    • Standards Evolution
    • WiFi Hot Spots
    • Wireless LAN Security
    • Where is WiFi?
    • Does speed matter?
  • The New Mobility
    • What are the new “killer apps”?
wireless lan standards evolution
Wireless LAN Standards Evolution
  • WiFi stands for: Wireless Fidelity, defined by the IEEE
  • Standards:
    • 1999: IEEE 802.11a and 802.11b
    • 1999: Dual Band IEEE 802.11a&b
    • 2003: IEEE 802.11g
802 11a
  • 54 Mbps maximum
  • 8 channels, 64 users per access point
  • Operating in the unregulated 5 GHz range
    • Shorter range than 2.4 GHz but less interference, up to 150 feet
  • Security: Strong 152 bits WEP encryption
802 11b
  • 11 Mbps maximum
  • 3 channels,32 users per access point
  • Operating in the 2.4 GHz range
    • 300 foot range (interference an issue)
  • Security: 48, 64 and 128 bits WEP encryption
  • The most widely deployed
802 11g
  • 54 Mbps maximum
    • Proprietary solutions up to 108 Mbps
  • 3 channels, 32 users per access point
  • Operating in the 2.4 GHz range
    • 300 foot range (interference an issue)
  • Security: same as 802.11b - 48, 64 and 128 bits WEP encryption
  • Backward compatible with all 802.11b but not with 802.11a
  • Fast becoming the accepted solution, since cost is similar to 802.11b equipment
dual band 802 11a b equipment
Dual Band (802.11a & b) Equipment
  • 54 Mbps & 11 Mbps
  • 8+3 channels, 64 users per access point
  • Operating in both 2.4 and 5 GHz ranges
  • Security: 152 bits WEP encryption
  • Does not support 802.11g (thus does not have high bit rate in long distances)
wireless lan security
Wireless LAN Security
  • WEP (Wired Equivalent Security)
    • 48, 64, 128 for 802.11b,g and 152-bit key for 802.11a
    • Supports
      • Confidentiality – prevents casual eavesdropping
      • Access Control – Authentication of users
      • Data Integrity – prevents tampering with the messages
    • Limitation: does not support key management
wireless lan security continued
Wireless LAN Security(continued)
  • WPA (WiFi Protected Access)
    • A subset of 802.11i and forward compatible with 802.11i
    • EAP (Extensible Authentication Protocol) Authentication based on 802.1X
    • Temporal Key Integrity Protocol (TKIP) encryption
wireless lan security continued1
Wireless LAN Security (continued)
  • 802.11i Robust Security Network (RSN) is being developed.
    • Uses TKIP and AES for stronger encryption.
    • In design phase, expected in 2005
wireless lan security continued2
Wireless LAN Security (continued)
  • VPN to create a private network over Wireless LAN
    • Creates a virtual tunnel
    • Encrypts data at the sending end and decrypt at the receiving end
    • Uses IPSec, L2TP and PPTP for tunneling, and 3DES and AES for encryption
where is wifi
Where is WiFi?
  • At work, providing connectivity for those who spend their time in meeting rooms
    • Laptops and most PDAs have WiFi built in
    • Next generation cell phones will be dual mode, GPRS and WiFi
  • At home, where wiring can be expensive and unattractive
    • Flexibility, anywhere in the house, even the backyard
    • In home appliances, allowing control and data transfer
      • Internet connected refrigerator
      • Home entertainment center
  • Hot spots
how many hot spots
How Many Hot Spots?
  • Over 30,000 commercial Access Points (AP) are available today. Reaching 100,000 by end of 2004
  • Over 4 Million Access Points already sold
  • An organic phenomenon….they are sprouting up everywhere
where are the wifi hot spots
Where are the WiFi Hot Spots?
  • Many airports and hotels
  • Most Starbucks coffee shops
  • Most McDonalds restaurants
  • Throughout the streets of Manhattan, San Jose, and numerous other cities
  • Most campuses and academic institutes
  • At base camp on Mount Everest!
does speed matter
Does speed matter?
  • 802.11b offers a nominal 11 Mbps, but in places with poor coverage, users might achieve speeds of only a few Mbps in certain areas
  • This few Mbps would be shared among all users
  • Short emails, normal VOIP conversations could succeed with these speeds
does speed matter1
Does speed matter?
  • Collaboration on large documents, presentations, exchanging video clips, etc. is frustrating at low speeds
  • 802.11g, with it’s nominal 54 Mbps, should ensure that even in the edges of the coverage area, bandwidth exceeds 10 Mbps, providing more than enough for serious video applications
the new mobility presence availability
The New Mobility – Presence & Availability
  • Presence & Availability change the way business communications is conducted
  • Allows a caller to view the destination’s availability before making the call
  • Allows users to decide who get to see their presence
  • Telephony features such as repeat dialing and camp-on become obsolete
  • Next generation communication products have presence-based call routing
wireless makes presence and availability ubiquitous
Wireless Makes Presence and Availability Ubiquitous
  • Wireless LAN technology mobilize these new features allowing Mobile Presence to span conference rooms, meetings, hot-desking and teleworking
  • The high bandwidth of Wireless LAN is the enabling technology, because of frequent presence status changes across all users
the new mobility instant messaging
The New Mobility – Instant Messaging
  • Instant Messaging is a real-time text based communication which is less obtrusive than voice calls
  • Allows multiple-IM sessions in parallel
  • Allows multiple-user IM sessions
  • Allows urgent communications during meetings without the disruptive nature of cell phone communication
the new mobility instant messaging1
The New Mobility – Instant Messaging
  • Highly accessible through firewalls and corporate boundaries
  • Combines internal / external users (using generic IM servers such as MS Passport)
  • Wireless LAN technology enables these new capabilities allowing mobile users and Teleworkers to exchange IMs while in a meeting, on a business trip, and on the go connecting from a hot-spot
the new mobility video conferencing
The New Mobility – Video Conferencing
  • Video Conferencing was expensive requiring dedicated video conferencing rooms
    • Per conference room cost of $10- $50K and include the TV sets, video conferencing controller, one or two cameras, foils scanner, ISDN equipment, etc.
    • The bandwidth of such configuration was up to 3 ISDN lines, i.e., 384 Kbps
the new mobility video conferencing1
The New Mobility – Video Conferencing
  • The new trend is Personal Video Conferencing
    • Low cost USB camera, SW (like MSN Messenger) and IP communications
    • MCU-based or direct peer-to-peer connectivity
    • Costs less than $100 per user
the new mobility video conferencing2
The New Mobility – Video Conferencing
  • Wireless LAN technology enables mobile video conferencing using a laptop or PDA from a hot spot
  • The high bandwidth allows multiple users to share the bandwidth and still have a high quality conferencing experience
the new mobility data collaboration
The New Mobility – Data Collaboration
  • Data Collaboration is the fastest growing communication paradigm
    • WebEx, LiveMeeting, WorkPlace
  • Enables users to share their work across the network
  • Saves travel time and money
  • Data Sharing
  • Application Sharing
the new mobility data collaboration1
The New Mobility – Data Collaboration
  • Web-based or using proprietary dedicated clients (like Microsoft NetMeeting)
  • Usually combined with voice or video conferencing
  • High-bandwidth wireless LAN technology provides enough bandwidth to allow multiple users to fully participate in a virtual personal video conferencing and data collaboration session!
openscape an example of the new breed of communications
OpenScape – An example of the new breed of communications

OpenScape creates intelligent relationships among all enterprise communication resources increasing the productivity of both workers and communication services by facilitating rich, successful communications on the first attempt

  • Key Features:
  • One-and-done communications
    • Give the users intelligent control of communications
    • Eliminates unproductive communication steps
    • Eliminates unwelcome communication intrusions
  • Presence aware workgroup collaborations
    • More efficient set-up of group communications
    • Provides a common interaction model for individuals and teams
    • One touch multi-media conferencing at any time
    • Managed coordination of participants and documents
  • Elevate productivity while containing communication costs
  • Provide a powerful SDK
    • Allows ISV’s and SI’s to customize for vertical markets
    • Web service integrations allows partner to deliver unique add to the customer
  • Media Independent
  • Device Independent
  • Application Independent
  • PBX Independence
  • Multi-Platform Access
examples of identity context values
Examples of Identity Context Values
  • Individual
    • In Office
    • Working Remotely
    • Be Right Back
    • In Meeting
    • On Business Trip
    • Out Of Office
    • On Vacation
    • No Interruptions
    • Unknown
  • Workgroup
    • Active
    • Inactive
scenario changing planes at o hare one hour to spare
Scenario: Changing planes at O'Hare, one hour to spare
  • User enters airline lounge, turns on laptop, connects to corporate OpenScape server through WiFi connection using a VPN
  • User reviews presence of some individuals, decides to launch an ad-hoc workgroup collaboration session
scenario changing planes at o hare one hour to spare1
Scenario: Changing planes at O'Hare, one hour to spare
  • User can select headset on PC, or cell phone, based on OpenScape audio rules or current preference
  • Voice conference launched first, more users added on the fly
  • Webex launched mid-session
  • Video can be added as well using camera on laptop
openscape my contacts portlet


Aggregated Media Contexts

Identity Contexts

OpenScape “My Contacts” Portlet
other devices make it even easier
Other devices make it even easier!
  • A smart cell phone
  • Standard PDAs, can handle this task, so a laptop is not even needed
  • Smart phones with PDA features are another option
your mobility advantage
Your mobility advantage
  • Users finally have access to a full-suite of collaboration tools almost everywhere
  • Ubiquitous WiFi assures you a high-bandwidth connection almost anywhere
  • A simple cell phone will be looked upon as a primitive device used only for one-to-one voice communications
the future of mobility
The future of mobility
  • A PDA/smart cell-phone with PDA features, or a laptop with headset, will become the preferred device for entering and launching conference calls for mobile workers, teleworkers and travelers
  • WiFi on airplanes extends this phenomenon to the sky (e.g. Connexion by Boeing )
the future of mobility1
The future of mobility
  • A new breed of mobile worker is born!
  • Always connected, with no penalty for being mobile.
  • Presence and availability apps make the real difference for mobility.
  • The killer apps are here, and there’s no turning back.