Transcript - IEEE Mentor

September 2002
doc.: IEEE 802.11-02/518r0
QoS Needs for Enterprise/VPN
Applications – A Service Provider View
AT&T
Presented by
Damon Wei – AT&T Business Services
Submission
Slide 1
Damon Wei, AT&T
September 2002
doc.: IEEE 802.11-02/518r0
Talk Outline
•
•
•
•
•
•
Submission
A Look at Managed LANs
Perception of Market and Growth
The Expanded Service Picture
QoS and Capacity Issues
Needs of QoS Based Services
Recommendations
Slide 2
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 3
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 4
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
Wireless LAN MDS Opportunity
"If any one technology has
Enterprise WLAN Forecast (Annual, 000’s)
emerged the past few years that
will be explosive in its impact,
it's 802.11."
 Emergence of dominant, proven
standard - 802.11 (Wireless
Ethernet)
 Ethernet compatibility (Natural
extension of Ethernet mgmt. tools)
 Increasing business acceptance
(Lower costs, VPN capability)
 New 802.11e Quality-of-Service
capability (Voice, Data, Video
support)
Submission
Slide 5
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 6
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 7
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 8
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 9
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
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
Submission
Slide 10
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
Backup Slides
Submission
Slide 11
AT&T
September 2002
doc.: IEEE 802.11-02/518r0
Timeline to Begin Implementing IP Telephony
% of Enterprises
(> 500 Employees)
100%
81%
91%
74%
80%
55%
60%
66%
60%
40%
20%
0%
44%
17%
13%
2000
2001
2002
2003
2004
Source: InfoTech; IP Telephony: Market Demand and Impact on CPE, 12/2000
Submission
Slide 12
AT&T