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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
Meru Networks Confidential
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%
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
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)
Meru Networks Confidential
Nokia
e6
0 (G
SM
)
UTS
tarc
om
F1
00
0
Cis
co 7
92
0
Sp
ectra
Lin
k i6
40
Wi-Fi Voice Endpoints Have Arrived
Hita
ch
i-Cab
leW
IP-5
00
0
Vocera
Bad
ge
Sp
ectra
Lin
k e
34
0
RIM
Bla
ckB
erry
72
70
Hita
ch
i-Cab
leW
IP-3
00
0
NEC
N9
00
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
Meru Networks Confidential
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?
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
What is driving FMC in enterprises?
14% increase in mobility of workforce by deploying FMC
Meru Networks Confidential
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
Meru Networks Confidential
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
Meru Networks Confidential
Significant Cost Benefits Realized
Meru Networks Confidential
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