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doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

Damon Wei, AT&T

Slide
1

QoS Needs for Enterprise/VPN
Applications


A Service Provider View

AT&T


Presented by

Damon Wei


AT&T Business Services

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
5

Wireless LAN MDS Opportunity

Enterprise 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)

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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


doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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 (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

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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


doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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


doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
11

Backup Slides

doc.: IEEE 802.11
-
02/518r0

Submission

September 2002

AT&T

Slide
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%

2000

2001

2002

2003

2004

% of Enterprises





(> 500 Employees)