1. doc.: IEEE 802.11-02/518r0 Submission September 2002 Damon Wei, AT&TSlide 1 QoS Needs for Enterprise/VPN Applications – A Service Provider View AT&T Presented by Damon Wei – AT&T Business Services

2. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 2 Talk Outline A Look at Managed LANs Perception of Market and Growth The Expanded Service Picture QoS and Capacity Issues Needs of QoS Based Services Recommendations

3. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 3 A Look at Managed-Service LANs LANs/broadband now a fundamental part of information-based businesses LANs are getting larger and faster Increasingly complex networking environment Now integral part of corporate intranets Upkeep rivaling circuit facilities Desire to upgrade reliability, reduce management overhead, increase utility Managed service packages increasingly attractive to maximize performance, control costs

4. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 4 Managed Services Wired-Wireless Market Wireless LANs widely adopted as enhancement to fixed LANs ($1.8B business in 2001) Market Growing at 12.5% CAGR (2001-2005 IDC 07/02) WLANs moving from small user pools to building-wide use Full-premises mobility viewed as productivity tool –SWAT Teams ( instant infrastructure/info access) –Meeting effectiveness (electronic distribution, collaboration) –Key decision maker response-time improvement –Mobility-dependent job (mfg. floor, inventory,etc) efficiency benefits –Reduced stranded wiring, easier move-and-change Majority of LAN RFQs include VoIP, WLAN, WVoIP capabilities VoIP market ~1B in 2001, steady WVoIP growth forecast

5. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 5 Wireless LAN MDS Opportunity Enterprise WLAN Forecast (Annual, 000s) "If any one technology has emerged the past few years that will be explosive in its impact, it's 802.11." Increasing business acceptance (Lower costs, VPN capability) New 802.11e Quality-of-Service capability (Voice, Data, Video support) Emergence of dominant, proven standard - 802.11 (Wireless Ethernet) Ethernet compatibility (Natural extension of Ethernet mgmt. tools)

6. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 6 Enterprise Service Picture Businesses seeking more communications utility (full multimedia support) for less cap-ex and labor cost VoIP, WVoIP high on list of desired immediate services –Retire aging PBXs and phones –Simplify provisioning (PC->laptop, deskphone->handset) –In-building, campus, multi-location telephone mobility –Multimedia voice/data integration (PDAs, PCs w/headsets) –Reduce cellular charges for on-prem calls Virtual Private Networks –Teleworkers now 1/5 of workforce, most at home –Cost savings about one times salary per year per teleworker –Desk cloning including telephony a large productivity factor –Simplified home distribution, convenience is key QoS, Security, Network Manageability, Scalability, Office/Home Interoperability are biggest issues

7. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 7 QoS, Capacity, Inter-Op Needs Businesses view telephony quality as part of company image Corporate networks, like commercial networks, must run with substantial loading to maximize return on capital expenditure Radio networks will remain throughput-challenged due to spectrum and power constraints (cant raise speed like Ethernet) MAC QoS guarantees are necessary to preserve end-to-end connection quality under heavy/overload conditions Parameterized QoS simplifies interface with corporate and backbone networks, supports end-to-end concatenation of links Increasing use of multimedia (audio, video) for customer relationship management (CRM), corporate education, video conferencing - requires QoS future-proofing QoS option must be common to all QOS-enabled clients to maximize utility regardless of use location

8. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 8 QoS-Based Service Requirements QoS declarations compatible with end-to-end network processing High rate voice coder, low system delay to keep last-link a small portion of total VoIP network delay budget System access and bearer resource partitions to prevent system access contention damage to streams in progress Guaranteed performance regardless of network load Differentiate signaling from user traffic under all conditions for management purposes Fast session entry/exit for discontinuous streams (e.g. voice activity) Sufficient parameter granularity to allow for existing and future radio resource efficiency

9. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 9 Service-Provider Observations Some WLAN services require guaranteed QoS (VoIP, VPN, video conferencing) Business networks need QOS to operate at high loads to provide economical, reliable service Parameterized QoS using HCF has demonstrated ability to provide service guarantees under high loads via simulations, tests, and trial service Migration path to parameterized 802.11 systems is necessary to satisfy changing business market and open VPN market for sustained market growth Prioritized and parameterized QoS as well as legacy support should be provided to enable customer satisfaction and operation of heterogeneous networks

10. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 10 Recommendations Facilitate managed-service QoS-dependent market via required network-grade mode (EPCF, Tspec, CC/RR) while ensuring interoperability of all modes (EDCF, HCF, Legacy DCF) Make 802.11 more user friendly by migrating from connectivity standard to access standard Allow market segments to decide what works best rather than dictating one-size-fits-all QoS

11. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 11 Backup Slides

12. doc.: IEEE 802.11-02/518r0 Submission September 2002 AT&TSlide 12 Timeline to Begin Implementing IP Telephony Source: InfoTech;IP Telephony: Market Demand and Impact on CPE, 12/2000 13% 44% 60% 66% 55% 74% 81% 91% 17% 0% 20% 40% 60% 80% 100% 20002001200220032004 % of Enterprises (> 500 Employees)