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Wireless Device Convergence
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  1. Wireless Device Convergence Spring 2005 CSG Meeting Jim Jokl jaj@Virginia.EDU

  2. UVa Perspective / Background • Initial interest to deploy an integrated Wireless Office solution in the late 1990s • Goal – better support for mobile users • Tight integration with campus PBX • Dial plan • Voice mail • Calling features (hold, forwarding, transfer, etc) • No/low-cost for on-campus wireless calls • Fund/deploy in-building wireless cellular coverage • Standard cell phone when used off-campus • Very close in RFP process with two vendors at different times • One vendor lost project funding during the .com bust

  3. Some Intermediate Devices • Symbol NetVision phone • Used our Cisco Call Manager • No voice mail integration with main system • Cisco 7920 phone • Used our Cisco Call Manager • No voice mail integration with main system • Vocera • Implements its own voice mail, text messaging, etc • Compaq iPAQ with VoIP software • iPAQ also enabled messaging applications (email & calendar) and web access

  4. Some Intermediate Devices • Blackberry • Early devices were primary for messaging • Phone available on some models now • Palm Treo • Messaging and cellular voice services • T-mobile and iPAQ 6315 • Voice and access to cellular-based messaging • WLAN access for normal Pocket PC applications • Shifts automatically between cellular and WiFi internet access

  5. Integrated WLAN VoIP and Cellular • Nokia announcement a couple of years ago • Seemed to imply that they were going to develop an integrated Cellular and WLAN VoIP device • Quiet with no additional information for a long time • Communicator 9500 promised for 2005 • Cellular and WLAN radios • Email: POP3, IMAP4 • Browsing • Camera, messaging, etc • Usual office-type support tools (spreadsheet, etc) • However, no mention of WLAN VoIP; instead appears to be a competitor to the iPAQ

  6. Technical BackgroundWireless Transmission Standards • On the cellular side • GSM (Global System for Mobile Communication) • Used widely in the rest of the world • A few carriers in the US use GSM • Cingular/AT&T • T-Mobile • CDMA (Code Division Multiple Access) • Not widely used outside of the US • Quite common in the US • Sprint PCS • Verizon • GSM data throughput somewhat slower than that of CDMA

  7. Technical BackgroundWireless Transmission Standards • On the WLAN side • 802.11 b/g • 11 or 54 Mbps peak speed in the 2.4 GHz band • Three non-overlapping channels available for RF coverage design and handling peak loads • Interference often exists due to multiple services that operate in this band • 802.11a • 54 Mbps peak speed in 5 GHz band • Twelve non-overlapping channels available • Typically covers ½ to ⅔ of the area of 802.11 b/g • Relatively free from interference

  8. Current Motivations for Integration • Original Wireless Office goals • Tight PBX integration, single voice mail, dial plan, calling features, etc • Lower cost for on-campus wireless calls • Additional drivers • Messaging (email and calendar) integration • In-building cellular coverage is problematic in many university buildings • Enhance cellular or WLAN coverage? • Need for superior in-building capacity to remove legacy phones • Leaky coax cellular solutions support a limited number of simultaneous calls • Voice over WLAN can support many calls per AP

  9. Current Motivations for Integration • Additional drivers continued • Cost • Estimates are that 1/3 of cellular calls are within the boundaries of an enterprise • This percentage would likely grow if in-building calls were perceived as free by the cell phone user

  10. Critical WLAN Issues for VoWLAN • Access point placement to meet call density needs • 802.11b can support ~8 calls per access point • 802.11g and 802.11a can support ~20 calls per access point • Mechanisms to protect portable device battery life • WLAN roaming within a building and across subnets

  11. Critical WLAN Issues for VoWLAN • Wireless LAN QoS • SpectraLink Voice Priority Protocol (SVP) • WiFi Alliance • WME (Wireless Media Extensions) • Four priorities (voice, video, best effort, and low) • 802.11e standard in progress • Wireless LAN Security • Authentication & encryption • WiFi Alliance WPA (Wi-Fi Protected Access) • EAP for authentication, TKIP for encryption • 802.11i standard is ratified

  12. Interesting Solution Avaya, Motorola, Proxim System • Overall solution implements • Automatic roaming between cellular and WLAN networks • Call handoff between cellular and WLAN networks • Roaming within the WLAN network • Single phone number • Single voice mail box • Data messaging services (Email, calendar, directory access, etc)

  13. Interesting SolutionAvaya, Motorola, Proxim System • Motorola • Converged handset • Wireless Services Manager • WLAN to Cellular handoffs • SIP proxy/registrar/subscriber configuration • Avaya/Proxim • Access points and gateways that provide QoS, security, roaming, call admission control, and device power management features • Avaya • Avaya Communications Manager • Telephony features, part of cellular/WLAN handoff, E911

  14. Interesting Solution Avaya, Motorola, Proxim System • Wireless: GSM and 802.11a • Battery life • 50 – 80 hours standby • 150 – 190 minutes talk time • Security: WPA and EAP-TLS • QoS: pre-802.11e • SIP for VoWLAN • Windows CE .NET • Browser: HTML & WAP 2.0 • Email client, calendar sync

  15. Some Q&A on the Motorola, Avaya, Proxim System • CDMA support is planned but no timeline is available • 802.11a is the planned WLAN radio infrastructure • Timeline: summer/fall 2005 • Proprietary vs. standards-based technology • Power management work contributed to 802.11e and 802.11k • Pre-authentication fast roaming work submitted to 802.11r

  16. Summary • The Motorola, Avaya, Proxim group appears to be furthest along in this space • but talk to your favorite vendors … • What about the big wireless carriers? • Do they consider this a good idea? • Consider home users over the long run • Remember that these devices are provide both converged voice and data • Expect to see lots of new products and services in this space over the next few years

  17. Questions / discussion • Thanks