September 2002

Damon Wei, AT&TSlide 1

doc.: IEEE 802.11-02/518r0

Submission

QoS Needs for Enterprise/VPN QoS Needs for Enterprise/VPN Applications – A Service Provider ViewApplications – A Service Provider View

AT&TAT&T

Presented byPresented by

Damon Wei – AT&T Business ServicesDamon Wei – AT&T Business Services

September 2002

AT&TSlide 2

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 3

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 4

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 5

doc.: IEEE 802.11-02/518r0

Submission

Wireless LAN MDS OpportunityEnterprise WLAN Forecast (Annual, 000’s)"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)

September 2002

AT&TSlide 6

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 7

doc.: IEEE 802.11-02/518r0

Submission

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 (can’t 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

September 2002

AT&TSlide 8

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 9

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 10

doc.: IEEE 802.11-02/518r0

Submission

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

September 2002

AT&TSlide 11

doc.: IEEE 802.11-02/518r0

Submission

Backup Slides

September 2002

AT&TSlide 12

doc.: IEEE 802.11-02/518r0

Submission

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%

2000 2001 2002 2003 2004

% of Enterprises (> 500 Employees)