1 / 17

Wireless Device Convergence

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

verne
Download Presentation

Wireless Device Convergence

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related