20081013 Vo Wlan

Voice over WLAN Overview

Girish Bhat

October 14, 2008

Meru Networks Confidential

Agenda

Enterprise VoIP Mobility- Drivers and Benefits

- Key Enablers / Inhibitors

- Solution Overview

Fixed Mobile Convergence- What Does It Mean?

- State of the Market

Customer Case Study- Drivers

- Requirements

- Benefits Realized

Summary - Adoption Predictions


VoWLAN: Market Trends

Represents two of the fastest growing technologies in IT

Increasing availability of Wi-Fi enabled handsets

-

200

400

600

800

1,000

1,200

1,400

2005 2006 2007 2008 2009

-

5,000

10,000

15,000

20,000

25,000

30,000

35,000

Source: Infonetics Research, Internal Analysis

WL

AN

Infr

astr

uct

ure

M

arke

t fo

r V

oIP

Mo

bili

ty

$ M

Wi-

Fi H

and

set

Un

it (

000)

S

hip

men

ts

WLAN Revenue

Wi-Fi Handset Units

WLAN Infrastructure for VoIP Mobility Market Size And Forecast2005-2009 CAGR = 92%


VoWLAN: Strong Benefits to Enterprise

Mobility & Productivity Benefits Anywhere, anytime access to applications Single handset, single number

Cost Benefits Moves, add, change costs Lower wiring and equipment costs Lower telecom costs


VoWLAN : Requirements

Requirements for robust, high-quality voice

- Low end-to-end delay

- Low jitter (variable packet arrival)

- Voice codecs expect consistent intervals on packets arrivals, eg. one packet per 20 ms

- Low packet loss every packet lost is a small portion of audio typically a 20-40ms audio duration

Metrics for Voice Quality

- Mean Opinion Score (MOS) commonly used for voice quality

- MOS range is 1-5; >3.6 is cellular quality; >4 is PSTN toll quality


VoWLAN : Protocols

Call Control Protocols in use on VoWLAN handsets- SIP is most common for WiFi and WiFi+GSM (dual-mode phones)

devices

- SpectraLink Voice Protocol for Polycom/SpectraLink handsets

- utilizes proprietary modifications to 802.11, requires AccessPoint vendors to implement support

- Vendor-proprietary phones that use PBX call-signaling protocols

Audio protocols and codecs in use- Real-time Transmission Protocol (RTP and its companion RTCP) for

transport of digital audio samples

- Voice Codecs predominantly G.711 (20ms or 30ms) or G.729


Network Components for Deployment of VoWLAN

Wired LAN- 100BaseT/1000BaseT switched Ethernet, Traffic Prioritization

Wireless LAN- Pervasive coverage across enterprise for seamless roaming- QoS mechanisms due to shared medium unlike the switched LAN

PBX System- IP PBX system, utilizing SIP (or alternate VoIP protocol on handsets)- Digital PBX in addition to VoIP Gateway interfacing with T1/PRI trunk for VoIP

functionality for Wi-Fi handsets

VoWLAN Handsets- Handsets selected to match deployment application - Supporting selected PBX protocol – SIP, H.323, Proprietary- Dedicated single-mode phone (Wi-Fi radio) or dual-mode phone (Wi-Fi and

cellular radios)


Nokia

e6

0 (G

SM

)

UTS

tarc

om

F1

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0

Cis

co 7

92

0

Sp

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Wi-Fi Voice Endpoints Have Arrived

Hita

ch

i-Cab

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IP-5

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0

Vocera

Bad

ge

Sp

ectra

Lin

k e

34

0

RIM

Bla

ckB

erry

72

70

Hita

ch

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IP-3

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0

NEC

N9

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iL (F

OM

A)

Sam

su

ng

i73

0 (G

SM

)

Nokia

e6

1 (G

SM

)

Qte

k 2

02

0 (G

SM

)

Sony Ericsson P990 (GSM)

Single-Mode Phones (802.11)

Dual-Mode Phones (802.11 and GSM/CDMA)

Nokia e70 (GSM)

Dopod D810HTC P3600


VoWLAN : Key Challenges

How to design a reliable network for How to design a reliable network for voice applications?voice applications?

VoWLAN

How to control How to control network access and network access and load balancing load balancing during peak during peak network usage?network usage?

Can the network Can the network recognize voice recognize voice protocols (SIP, protocols (SIP, RTP/RTCP, SVP) and RTP/RTCP, SVP) and apply QoS?apply QoS?

Does the Does the system identify system identify handsets and handsets and allow me to allow me to identify active identify active phones/calls?phones/calls?

Reliability

Voice Quality

Call Admission Control

Management

Voice Protocol Awareness

Does the Does the network meet network meet low latency, low latency, jitter, packet jitter, packet

loss loss requirements requirements and offer MOS and offer MOS

> 3.6?> 3.6?


Toll-Quality Voice over WLAN available today

1 802.11g AP• 28 VoIP Conversations• 8 Data Clients

1 802.11g AP• 28 VoIP Conversations• 8 Data Clients


Building a Solution

Nokia Dual-mode phone

PSTN

Wireless LAN Controller

Access Point

Ascom i75 Handsets

BlackBerry®

Hitachi-CableWIP-5000

Outside Enterprise Inside Enterprise

Cellular Network

Channel 1 VirtualCell

Example Deployment Options:Industrial/Healthcare Applications Ascom, Polycom

Basic WiFi VoIP Handset WIP-5000

“Corridor Warrior”, IT Staff Blackberry, Moto

Mobile, Multi-site Worker Nokia, HTC, HP iPaq

SIP

PB

X Access Point

IP-PBX with SIP


FMC: An Overloaded Term

What is FMC (Fixed-Mobile Convergence)- Use of a single device for getting calls (and applications) inside an

Enterprise campus and outside (productivity)

- Using some lower-cost, higher-bandwidth network (Wi-Fi) where available and using cellular elsewhere (cost)

- Phone number (and applications) remain under Enterprise control (control)

Elements of the Solution- Handset

- Application on Handset

- “FMC” Server adjacent to a PBX


Realizing FMC : 3-ways

“Hair-pinning”- Single-mode handset with application to provide PBX-capability- E.g. Avaya, Cisco clients on Nokia phones- Productivity advantages but no cost advantages

Carrier-based- Dual-mode handset- FMC “server” is in carrier networks- PBX can be hosted or on premise- Capability dependent on carrier offering service, type of handsets and their billing plans

Enterprise-based- Dual-mode handset- FMC “server” in Enterprise-network and managed by IT- No dependency on carriers offering the service- Enterprise controls choice of handsets, number owned by Enterprise, no-cost when over

Wi-Fi- Full benefits realized: productivity, cost, control


What is driving FMC in enterprises?

14% increase in mobility of workforce by deploying FMC


All-Wireless Enterprise: Example

World’s Largest dual-mode phone + data deployment

- $9B Public Utility

- 15K employees

- 50 offices

- 6000 dual-mode WiFi/cellular; 3000 WiFi only phones

- 1000s of laptops

- “Address-free” offices: voice and data connectivityanywhere

- True one-number access: calls running over WLAN indoors, cellular outdoors


Number of extension telephones

Mobile Phones4,000

Total 11,000

Dual-mode Phones

PRESENT After IP Phone

deployment

Total 16,000

Office

extensions

11,000

1,000

Fax, Other

Wireless IP Phone

Fixed IP Phone

1,000

Fax, Other


Significant Cost Benefits Realized


Predictions : Wireless VoIP in the Enterprise

Drivers- Mobility benefits

- Single number

- Lower costs

- Improved coverage

Where is Wireless VoIP Today ?- Primarily Single-mode Wi-Fi Deployments

- Phase 1: In Enterprises where workforce is mobile within campus

- Healthcare, Retail, Warehousing, Factories

Future of Wireless VoIP - Both single mode and dual-mode (Cellular+WiFi) devices

- Phase 2: Enterprise with workforce mobile within campus and outside: Insurance companies, Utilities, professional services, healthcare

- Phase 3: General Enterprise for coverage, cost, productivity reasons

Technology

20081013 Vo Wlan