Post on 10-Jan-2016
description
transcript
Inside Wireless Voice and Data
Net@Edu Wireless Networking Meeting
Kamal AnandVP Marketing
Kamal@merunetworks.com
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Agenda
Overview of Different Wireless Technologies► Why 802.11 WLAN is the one for indoor
Special Requirements for 802.11 in University Deployments
► How these are getting addressed
Different Applications for Wireless► Replacement for Wired► Voice, Video over Wireless
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Company Background
Founded in Feb, 2002
Funded by seven leading Venture Capital Firms
Headquartered in Sunnyvale, CA
Ujjal Kohli, Chairman, CEO and Founder► VP/GM, AirTouch Cellular (Acquired by Vodafone)
► McKinsey & Co, Intel (engineering & marketing)
► Founder, MKS Ventures ($50m
Dr. Vaduvur Bharghavan, CTO and Founder► Ph.D. EECS, UC Berkeley – thesis in 802.11
► 10 years in wireless research and establishing 802.11 standards
► Over 40 publications and patents on 802.11
► Founder, Chairman and CTO, Bytemobile
► Program Chair ACM Mobicom 2002, NSF Young Investigator 1996
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Wireless Standards
PAN
WAN
MAN
LAN
IEEE 802.15Bluetooth
IEEE 802.11WirelessLAN
IEEE 802.21
IEEE 802.16WirelessMAN
IEEE 802.20(proposed)
IEEE 802.16e WirelessMAN
Focus of Discussion
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Bluetooth Applications
Bluetooth technology► Designed for personal
area networking (PAN)► Short-range, Low Power
Products► Cellular phones► Headsets► PDAs► Keyboards and mice
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WiMAX Applications Metropolitan area network
(MAN) technology- Connection-oriented- QoS- Line of sight and non-
line of sight
Based on IEEE 802.16 and ETSI HIPERMAN standards
Applications► Last-mile broadband
access► DSL and cable
modem alternative► Hotspot (inter 802.11)
connectivity
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Why is 802.11 the Winning Indoor Technology?
50 million clients today, + 50 million this year Dramatic cost decreases due to volume Clients are “free” Available at multiple locations – homes,
hotspots, office, cities, … Given adoption, R&D will fix any remaining
issues with technology
802.11 is to Wireless Communications What the x86 was to Computing and
What Ethernet was to Networking
802.11 is to Wireless Communications What the x86 was to Computing and
What Ethernet was to Networking
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Wireless LAN Evolution
Number of Clients and Coverage
Applications
Products /Technology
• Email, Web
• Stand-aloneAccess Points
Stand Alone Multi-site
• Email, Web from different locations
• Centralized security and management
• High Density, Application QoS, Transparent mobility
• Voice and Data• Business applications• Primary connectivity
Pervasive
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WLAN Product EvolutionS
ervi
ces
2000-01 2002-3 2003-4
Cisco 350Proxim/Agere
LinksysBasic
Connectivity
Cisco 350Proxim/Agere
LinksysBasic
Connectivity
Cisco 1200+SWAN+ some startups
+ …Gen 1 +
Central MgntSecurity
Cisco 1200+SWAN+ some startups
+ …Gen 1 +
Central MgntSecurity
MeruGen 2 +
RF CoordinationHigh Density
QoSZero Handoff
MeruGen 2 +
RF CoordinationHigh Density
QoSZero Handoff
Stand-alone
Coordinated AP’sand Central Appliance
Aggregated AP’s
1st Generation 2nd Generation 3rd Generation
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University Environment Has Special Requirements For WLANs High Density of Users
► in Class Rooms, Library, Common Areas
Very Mobile and “Leading-Edge” User Community► Students – don’t have one “office”; Faculty – moving around► Want to leverage new capabilities in mobile data, voice, video,
collaboration …
Security► Semi-autonomous organizational/administrative domains► Access By Different Classes of Users
► Students, Faculty, Administrators, Guests
Budgets Constrained – Well this is common!
802.11 Not Designed To Address Some of These Requirements
802.11 Not Designed To Address Some of These Requirements
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Key Requirements WLANs
SecuritySecurity
Easy Deployment & Management
Easy Deployment & Management
Transparent MobilityTransparent Mobility
High DensityHigh Density
QoSQoS 5x Number of Voice Calls
5X Number of Active Users
0X Loss-less Handoff
MeruAir Traffic Control
Technology
With Standard WiFi Clients
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802.11 Was Not Designed for DensityBut Problem Can Be Solved
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Tot
al B
andw
idth
at
Pea
k (M
bps) 5
8
11
1
3
Baseband + Protocol Overhead
ContentionLoss
ContentionLoss
Today’s APPerformance
Meru AP Performance
Active Users Per AP
Today Meru
10-20
100+
5X5X
Number of Active Users
Peak Aggregate Throughput in Single Cell Environment
5X5X
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5.5/11Mbps
CS
Re
ce
ive
Sig
na
l
1Mbps
Distance
Cellsize
Collision Domain
Interferencedomain
Interference Range Is Much Larger
Than Communications Range
Effective Client Density Higher Due to Contention Across Cells
1
Floor 1Floor 1
1
611
1
…. Causing Contention Across Cells
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6111
111
Floor 2Floor 2
16
11
1
116
111
111
6
11
16
1 1
X X
X
X
X
Floor 1
Channel planning no use; same channel one cell away
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• Unpredictable channel access, latency, jitter
• AP gets proportional share of channel as one of the clients
No over-the-air QoS
• Predictable channel access, latency, jitter
• AP gets the right amount of channel access (50%)
MS
I D
5.56
2
6
4
8
10
12
5.36 5.38 5.4 5.44 5.46 5.48 5.5 5.52 5.545.42
Channel Access with Meru AP for QoS
Time (Sec)
Over-the-air QoS
Dealing with QoS / Real-time Applications on 802.111
5.46 5.48 5.5 5.52 5.54 5.56Time (Sec)
Channel Access with Today’s 802.11 APChannel Access with Today’s 802.11 AP
2
6
4
8
10
12
5.36 5.38 5.4 5.445.42
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Today’s APProprietary Client
Today’s APStandard Client
Meru APStandard Client
With Right Over-the-Air QoS, 802.11 Can Support Voice and Video at Scale
Dynamic mix of voiceand data on same channels
Typically on separatechannels/network
30+
7-10< 5
5X5X
AP
No over-the-air
QoS Wired QoS
Wired QoS
Over-the-air QoS
Meru AP
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Handoff Provides Challenge for VoiceNeed Infrastructure Controlled Handoff
300ms – 1 sec between handoff
Today’s WLAN Meru WLAN
Virtual AP Architecture
Zero-handoff with no loss
BSSID = ZZ BSSID = ZZ
00:00
BSSID = XX BSSID = YY
01:00
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WEP TKIP WPA VPN
Web 802.1x + EAP VPN
Rogue Device Detection and Mitigation
Sufficient Security Available Today
En
cryp
tio
n
Authentication
Detection
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Virtual WLANs Over Same Physical WLAN – Advantages in Universities
Multiple ESSIDs ► Guest VLAN
Administrative Control Can Remain at Existing Levels
Configure policies independently:
► Primary/Secondary RADIUS► Authentication methods ► Encryption policies ► DHCP servers ► Bandwidth Provisioning ► QoS policies
Accounting Per Group
Layer 2/3
Radius
DHCP
ESSID = Engg= VLAN2
2 3
ESSID= Guest Access = VLAN 5
ESSID = Faculty= VLAN3
ESSID =Business-school= VLAN 4
Switch
VLAN 2 3 4
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Deployment and Management …. Becoming Easy Centralized Control and
Management
No static frequency planning
Plug and Play Deployment for Access Points
Appropriate Channels, Power Levels Set Automatically
Controller
Switched/RoutedCorporate Network
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New WLANs Have Simple Deployment Architecture
Floor 2Floor 2
Floor 1Floor 1
Data CenterData Center
Backbone
Virtual APVirtual AP
AP
AP
Meru Controller
AP Access Points and Controller Connected Using Existing Wired Switches
Can use existing 802.1x authentication via PEAP, EAP-TLS, LEAP
Simple, Scalable, Cost-Effective
Leverage Existing Wired Investments
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Applications
Replacement of Wired Ethernet► Class Rooms, Dorms, Common Areas
Voice over WLAN► Service to Users► Revenue Generator
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Unwiring is the Future
School of Business, Initially Looked to Deploy Wired Ethernet in Classroom at Cost of Approx $40-50K
► new switch, wiring, labor
With Predictable 802.11 Network Able to Deal with High Density, Deployed Wireless Network at Cost Savings of 70%
Incremental Classrooms Can be Deployed at Cost-savings of 80%
Provide Improved Service, Applications, MobilityProvide Improved Service, Applications, Mobility+
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Why Voice Over Wireless LAN?Compelling Business Case
Lower wiring costs for data and voice
Total BenefitsOf WLANs that
carry Voice + Data
Lower costs for computer moves,
adds, changes (MAC)
ProductivityImprovement from
on-campus voice mobility
Voice ServicesTo
Students
Email, Web access
Mobility
Benefits from WLANs
TotalBenefits
of Data-only WLANs
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Industry Moving to Support Enterprise Voice over WiFi
Wireless Built-into Compute Devices
Laptops PDAs
VoIP Has Achieved Momentum
IP phone lines > Traditional Lines in 2003
60% growth in VoIP in 2002
Good Quality & Features Available in Softphones
Laptops, Desktops PDAs
802.11 Voice Devices Coming to Market
802.11 only Phones Dual mode (Cellular, WiFi) Custom devices
Source: In-Stat 5/03; Dell’Oro 7/03
EnterpriseNetwork Infrastructure
EnterpriseNetwork Infrastructure
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Why Don’t We See Much More Widespread Deployment Today?
1. Not Many Handsets Available
2. Handsets are Expensive
3. Wi-Fi Infrastructure Does Not Support Enterprise-Grade Voice
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Wi-Fi Phones Becoming Available
and Cost-Effective
About 10+ WiFi Phones in market in 2004
Dual mode (WiFi and Cellular in the market in 2H, 2004)
Overall solution pricing and choices becoming very attractive
Price Decline of WiFi Phone
0100200300400500600700800
2002 2003 2004 2005
$ P
er
Phone
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Dartmouth College, NH
Dartmouth College, NH, is converging voice, video and data onto its wireless IP network
Students can make local and long distance calls free anywhere on campus using IP SoftPhones on their Windows PCs.
Reduced cost and improved communication
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Darthmouth College - Applications
"No one wants to plug in anymore," says Brad Noblet, the school's director of technical services. About 90% of Dartmouth's freshmen arrived with wireless-enabled laptops.
"We've found new ways for professors to teach students and new ways for students to interact, not just with their professors, but amongst themselves and outside people as well," says Noblet. "Students will be able to
watch TV on one window, check e-mail on another, and do homework on a third," Noblet explains. "We want to converge media to deliver that content over a common infrastructure."
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Voice / Messaging Over WLANRight Communication Paradigm Service Can Be Offered for “Free” to Users
► Improve Service-level to Students► Differentiating Factor for University► Improved Quality of Life
Or Can be Revenue-Generating Offering► Offered in Partnership with Service Provider► Simple economic calculation:
10,000 Students
X $10 / Mo Profit
9 Months Per Year
~ $1M Contribution /
Year
~ $1M Contribution /
YearX =
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Summary 802.11-based WLANs Is the Accepted
Indoor Wireless Technology Technical Challenges To Address Some Limitations,
Especially in University Settings, are Getting Addressed
► Security and management are not the key problems anymore
Integration with WAN Technologies Will Happen Over This Year and Next
The Right WLAN Infrastructure Can be Leveraged To Reduce Costs, Improve Service and Increase Funding!
Thank You
Net@Edu Wireless Networking Meeting
Kamal AnandVP Marketing
Kamal@merunetworks.com