Korneel Bullens & Pascal Menezes UC Voice Architect & Senior Program ManagerMicrosoft Corporation

Lync Mobile Devices and Wi-Fi

PLAN305

Korneel Bullens• UC Voice Architect• MCS Voice Center of Excellence• MCM 2010• Started as telecom engineer• Worked @ Microsoft Partner

Pascal Menezes

• Lync Partner Engineering • Partner PM for Lync over Wi-Fi • Partner PM for Lync Wi-Fi Dogfooding with

MSIT and Msft buildings • Driving UC Mobility over WI-Fi within WFA

and 16 industry partners

Session Overview• Why Wi-Fi?• Challenges in Real Time Media & Wi-Fi• Common Usage Scenarios• Lync Mobile Devices• Wi-Fi Design Considerations for Real Time

Media• Lync Wi-Fi Partner Program• Demo• Frequently Asked Questions

Fortune 100 1 >80% deploying mobile clientsSmartphones 289M in 2010 >900M in 2014 1

Slates 55M in 2011 >200M in 2014

1 Gartner Forecast: Mobile Devices, Worldwide 2010 2 Gartner: Key Issues for Communications Enterprise Strategies, 2011. March 20113 Gartner: Is Your Wi-Fi Network Ready for Video? May 2011

Why WIFi?• Customers starting to push towards

greater media over mobile scenarios• Optimize cellular minute and data plans• “Wireless by default, wired when necessary.” 2 • Network managers tasked to plan for convergence • In many cases all wireless • Trends are for greatly increased bandwidth usage• Up to 100 personal video devices for each currently

installed room system. 3

Mobile Devices in the Enterprise

• 47% of employees use smartphones instead of desk phones for work calls (IDC report)

• 69% use smartphones to access business apps (IDC report)

• BYOD is here to stay: it improves productivity, collaboration, and cost management

Fortune 100>80% deploying mobile clientsSmartphones289M in 2010 >900M in 2014*Tablets55M in 2011 >200M in 2014** Gartner

*Gartner & IDC 2012

Fortune 100 >80% embracing BYOD*Mobile Device Growth 90% growth over next 4 years*Personal Devices on Network 4.5 B personal devices by 2015*

Consumerization of IT & BYOD

• 80% of employees are using personal Wi-Fi enabled devices for work purposes forcing IT to embrace BYOD over WLAN

Wi-Fi proliferation within the enterprises to enable mobility

• Wi-Fi is a key technology to enable capacity and scalability for mobile devices

• Reduce cellular charges

BYOD are increasingly capable of rich media

• Employees demanding similar rich experience within the enterprise as in their personal life (Skype, Facetime, etc)

The Bring Your Own Device Explosion

Challenges in Real Time Media & Wi-Fi

Real Time Media & Wi-Fi CategoriesData over Wi-Fi

• Desktops, laptop, slates & mobile smart phones• IM, presence, web conferencing & calendaring

Real-time Media over Wi-Fi: Fixed• Voice mail, video conferencing, telephony and audio conferencing • Nomadic capabilities for RT-Media• Includes Lync Data over Wi-Fi

Real-Time Media over Wi-Fi: Mobile• Originate, consume & terminate Lync services while mobile• Includes Lync RT-Media over Wi-Fi Fixed

Real Time Media Network Traffic• Consistent flow of data packets

• Sensitive to delay, jitter and packet loss

• Random loss can be compensated – sequential loss is problematic

• Interruptions have notable effect on experience (voice)

• High bitrate is coming with HD video (1.5+ Mbps each way per stream)

Real-Time Media Characteristics Streaming vs. Real-Time Media• Video playback applications like YouTube, Netflix, etc can utilize large receive

side buffers in order smooth out network delays

• Real-Time media is interactive and requires a high performance network that can sustain continuous up/down stream traffic, with low-latency, low jitter

Impact to Human Interaction• Human communication starts to get negatively impacted with latency of

more than 250 msec

• Bursty jitter or packet loss over a certain threshold cannot be recovered, and leads to glitches in the audio and video stream

• Especially audio (voice) glitches are very disruptive and lead to a poor user experience

Real-Time Network RequirementsBandwidth requirements

• Audio 50 Kbps to 160 Kbps per stream (incl. IP header and error recovery overhead)• Video 200 Kbps to 4 Mbps per stream – multiple concurrent video streams are possible for

multiparty video conferencing

Jitter • Periodicity of packet 10 msec • Desired jitter less than 20 msec

End-to End Network Latency• Desired less than 100 msec • Acceptable less than 200 msec • Depends on geography

Packet Loss and delay• Desired 0%, acceptable <2% and not more than 3 consecutive lost packets

UDP vs. TCP • Both UDP and TCP are supported for Real-Time Media• UDP is preferred for Real-Time media – since TCP recovery (retransmits) is usually too long

The Bring Your Own Device IssueThe Market Driver is BYOD

• Millions of personal mobile devices being used in the enterprise under BYOD policies

BYOD lacks the Wi-Fi features for UC voice & video• These mobile devices depend on Wi-Fi but have consumer grade Wi-Fi mainly in drivers

Net Results Are Frustrated Users/IT Departments • Poor audio/video quality and dropped calls

IT policy is use wired or cellular for UC voice/video

Ultimate result is poor adoption of UC on Wi-Fi • Slowing the migration of voice/video to Wi-Fi

Wi-Fi Issues - Off-Channel ScanningBackground scanning mechanisms can be too long and inconsistent which affects UC real-time media traffic

Wi-Fi Issues - Real-World Handover Performance• UC real-time media sessions have

very different requirements when roaming between APs then traditional data sessions

• Delayed handovers from sticky stations can result in multi-second media breaks for UC voice/video

• Stations often ‘stick’ to an associated AP even when its signal strength has deteriorated so far as to be unusable. This is because many stations are not optimized for proper roaming in a multi-AP environment

Wi-Fi Issues - Rate Adaption and TX Retries• Existing station rate

adaption algorithms not well suited for UC

• May take up too much airtime in retries for UC real-time media traffic

Common Usage Scenarios

12

UC over Wi-Fi for Enterprise - Fixed• Colleagues are in conference

room and join an online conference with others using one of their tablets over Wi-Fi

• Audio is first initiated and soon afterwards the conference escalates to adding in video for all parties involved. The video shows tiles of all other parties simultaneously

• A virtual whiteboard is next activated for all parties to collaborate

• The meeting last for an hour

12

Corpnet

UC

UC

UC

UC over Wi-Fi for Enterprise - Mobile• John takes an incoming call on

his UC enabled smart phone at his desk and starts a discussion

• John realizes he has a meeting coming up which will take 10 minutes to walk across the building

• John just gets up and starts walking to his meeting while continuing on with his conversation.

• When John gets to his meeting he ends his call and attends his scheduled meeting.

Corpnet

Lync Mobile Devices

Laptops• Full Lync Client• Modern UI Client

Tablets• Full Lync Client (X86\X64 devices)• Modern UI Clients (X86\X64\ARM devices)• Mobile Client (IOS\Android devices)

SmartPhones• Lync Mobile Client (Windows Phone 8, Android, IOS)

Lync Clients for Mobile

Mobile Clients codec support;• RTAudio for P2P calls• G711 for PSTN calls• G722 for Conferencing• Siren for backwards compatibility in conferencing• H264 for video including hardware offloading (simulcast support for 1080P, 720P and

480P)• RTVideo is added when legacy clients are connected

Appsharing via Remote Desktop Protocol

Clients can operate in fore- and background

Automatic Reconnects to conferences when disconnected

Full Client & Modern Client Capabilities

Full Lync ClientMax Video Resolution

• Send: up to 1080P in H264, 720P in RTVideo• Note; a typical conference will simulcast 1080P, 240P and 180P from the same client

• Receive: up to 1080P• Note; a client will always request the optimal stream. When in windowed mode the client will

not request\receive 1080P but probably 480P or 240P.• A conference can receive up to a single 1080P stream, or 5 240P streams in common

scenarios

Data Usage• Conferencing: average 1500 kilobit/sec up to 4000 kilobit/sec• P2P HD Video: average 3200 up to 4000 kilobit/sec

Laptop Characteristics

Modern Lync ClientMax Video Resolution

• Send: up to 1080P in H264, 720P in RTVideo• Note; a typical conference will simulcast 1080P, 240P and 180P from the same client

• Receive: up to 1080P• Note; a client will always request the optimal stream. When in windowed mode the client will

not request\receive 1080P but probably 480P or 240P.• A conference can receive up to a single 1080P stream, or 3 240P streams in common

scenarios

Data Usage• Conferencing: average 900 kilobit/sec up to 4000 kilobit/sec• P2P HD Video: average 3200 up to 4000 kilobit/sec

Tablet Characteristics

Mobile Clients codec support;• G711 for PSTN calls• G722 for Conferencing• Siren for P2P• RTA is not supported• H264 for video (hardware offload support on Phone 8 only)• RTVideo only when legacy clients are connected

Appsharing is only available on iPad

No handover between networks (WiFi <> 3G/4G <> GSM)

Clients can operate in fore- and background

Video is switched off when in background mode

Mobile Client Capabilities

iPad 3 Characteristics (Over WiFi)Max Video Resolution

• Send: up to QVGA (424x320) @15fps• Receive: up to VGA (640x480) or 360p (640x360) @15 fps

Battery drain time from 100% to 0%;• IM + Appsharing (Conf) : up to 9 hours• IM + Appsharing + Video (conf) : up to 6 hours and 30 minutes

Data Usage• IM + Appsharing : 766 MB in 9 hours = 189 kilobit/sec average• IM + Appsharing + Video : 2386 MB in 6 hours 40 minutes = 795 kilobit / sec average

iPhone 4 CharacteristicsMax Video Resolution

• Send: up to QVGA (424x320) @15fps• Receive: up to VGA (640x480) or 360p (640x360) @15 fps

Battery drain time from 100% to 0%;• IM + Audio (P2P) : up to 8 hours and 30 minutes• IM + Video (Conf): up to 3 hours• FaceTime on iPhone: up to 3 hours

Data Usage• IM + Video (conf): 400 kilobit / sec average

Android CharacteristicsMax Video Resolution

• Send: up to QVGA (424x320) @15fps• Receive: up to VGA (640x480) or 360p (640x360) @15 fps• With QCOM 8X60 chipset:

• Send: up to VGA (640x480) @15fps

Battery drain time from 100% to 0%;• No info at this moment

Data Usage• IM + Video (conf) : 400 kilobit / sec average

Phone 8 CharacteristicsMax Video Resolution

• Send: up to 640X480• Receive: up to 424X240• Full Hardware Offloading

Battery drain time from 100% to 0%;• Phone 8 on WiFi Audio : between 2 and 4 hours• Phone 8 on WiFi Video : between 2 and 3 hours• Phone 8 on 3G Video : between 1 and 2 hours

Data Usage• Video (P2P) : 450 kilobit /sec average

Wi-Fi Design Considerations for Real Time Media

Wi-Fi Deployment GuidanceEnterprise• Managed Wi-Fi deployment with multiple APs

Home• Home router Wi-Fi AP

Hotspot• Single to SMB size deployment

HotspotHome

Enterprise

Lync Over Wi-Fi Design ConsiderationsCan your network handle the load?

• Average of 2.5 Wi-Fi enabled devices per user

• Multimedia UC traffic from 802.11n devices

Do you have ubiquitous coverage?• Networks designed for data/hotspot coverage won’t deliver a

good multimedia UC experience

Is your network ready for BYOD?• BYOD creates massive security issues

Is end-to-end QoS a challenge?• Networks often incorrectly tag multimedia traffic

• Encrypted UC traffic also needs correct Quality of Service (QoS)

Enterprise Wi-Fi deploymentPlanning• Wi-Fi only vs. mixed wired and Wi-Fi deployments• Determine devices support requirement (11g/n - 11b?)• Determine density - regular office space - conference

room – common areas• Determine workloads over Wi-Fi - Real-time media

support• Type of devices connected – Enterprise notebook and/or

“BYOD” (Bring-your-own-device)• Mobile device support - Powersave features• Support for guests SSID and mobile device SSID• QoS support (WMM for Wi-Fi)

Enterprise Wi-Fi deploymentInfrastructure recommendations • Enterprise WLAN controller with thin enterprise grade APs or standalone APs

• Deploy 802.11n APs

• Implement WPA2 in Enterprise Mode

• Deploy APs featuring dual (concurrent) 2.4 GHz and 5 GHz operation with 3x3 configuration and 1 Gbps backhaul

• Support for RF auto radio management of channel and signal strength

• Fast BBS transition support – OKC

• Sufficient AP density for seamless coverage. Deploy applicable AP density for required coverage and capacity but keep signal levels between -45dbm to -65dbm and SNR better then 30db (40db preferred)

• Design for capacity based on # of clients in coverage area

• Plan for overlapping AP coverage (redundancy) is required

• Deploy in large conference rooms multiple APs

• Enable AP load balancing

Enterprise Wi-Fi deploymentInfrastructure recommendations continued

• 2.4 GHz band:

• Drop 11b support

• Limit 11n support to 20 MHz channels

• 5 GHz band:

• Enable band steering of dual band capable devices to 5 GHz

• 40 MHz channel

• Implement QoS/WMM with EF queue for WMM Voice

• Enable WMM on APs for QoS but not mandatory. Enable QoS on Lync servers and clients

• Ensure proper QoS on wired network with slower links

• Ability to classify and prioritize Lync traffic (SIP-TLS) in the presence of lower priority data traffic

• Enable power saving mechanisms ( Legacy or UAPSD) // recommended DTIM is 2 for voice if using legacy mode

Lync QoS Guidance

Enterprise Wi-Fi clientsClient recommendations • Enterprise class notebooks • High-quality dual band NIC with at least 2x2:2 configuration • Support for Radio resource management 802.11k• Real-time media optimized/certified NIC and drivers • Manage NIC driver versions• Mobile devices supporting dual band is better• BYOD is a reality so be prepared

Home Wi-Fi Recommendations• Upgrade 11b and 11g routers to 11n

• Evaluate “Default” channel on 2.4 GHz – most Wi-Fi routers default to “6”

• Upgrade Wi-Fi routers supporting concurrent dual band with 2x2:2 configuration

• 11n 2.4 GHz band limit to 20 MHz channels

• “Move” dual band devices to 5 GHz (unless there are range limitations)

• Source of RF interference in 2.4 GHz

Neighbor APs on the same channel

Bluetooth devices

Game consoles (wireless controllers)

Cordless phones

• Avoid wireless range extenders (if possible)

• Implement application (port/protocol) based QoS for real-time media on Wi-Fi router

Hotspot Wi-Fi deploymentRecommendations• Plan for usage and concurrently connected devices

• Small deployment SMB or entry level Enterprise AP/Controller

• Multiple APs if more than 15 concurrent users are anticipated

• Deploy SMB APs which support basic load balancing

• Typically limited to 2.4 GHz band

• Implement policies, such as per device bandwidth quota

• Block traffic for typical file sharing applications

Powersave and DTIM intervalDTIM interval adjustment for low-power devices• Multicast support in Wi-Fi requires clients to wake up at

a set interval controlled by DTIM (Delivery Traffic Indication Message) interval

• Shorter interval - low latency for multi-cast• Longer internal – Wi-Fi radios on mobile devices can

remain longer in lower power sleep mode• DTIM interval is trade-off between multi-cast latency

and power savings for mobile devices• Example: Increase 100 msec default to 300 msec• Option to configure a dedicated SSID for mobile devices

Lync Wi-Fi Partner Program

Partners Bring Wi-Fi To Lync

Simple & Flexible Deployment

Highly Robust, Secure Wi-Fi

*BYOD Security& Support

Lync Qualified Wi-FiScales from Lync OnLine to Server 2013Voice/Video OptimizedEnd-to-End QoS for Encrypted Lync*BYOD EnablementOnboards Any Device Securely

Lync Over Wi-Fi Partner StrategyStrategic Partnership: Better Together

• Microsoft partners to ensure Wi-Fi QoS for Lync’s encrypted application flows

Qualification Program• Stringent quality test suite to ensure that Lync

traffic is handled properly over Wi-Fi without compromises to performance or security

Lync Network Diagnostic API• Provide visibility into call quality and diagnostics

to identify the source of any problems

Partner Lync Wi-Fi Qualification ProgramAP Infrastructure

Data Only

Real Time Media Fixed

Real Time Media Mobile

DevicesData Only

Real Time Media Fixed

Real Time Media Mobile

Microsoft Lync Qualification Using Ixia

• Ixia is the gold standard for Wi-Fi testing, with hundreds of global customers

• World’s leading equipment vendors, silicon manufactures, enterprises, and service providers use Ixia for Wi-Fi product testing

• Ixia’s Professional Services Organization will provide AP qualification testing

• All testing will occur in Ixia’s lab in Santa Clara, CA• Ixia will conduct all tests in accordance with

Microsoft’s test plan• Each Microsoft Partner (“Vendor”) will enter into an

engagement with Ixia.

Info• Interested in being a partner please

contact pmeneze@microsoft.com• Info on Wi-Fi deployment guidance

documents • Lync 2010

• http://www.microsoft.com/en-us/download/details.aspx?id=35401• Lync 2013

• http://www.microsoft.com/en-us/download/details.aspx?id=36494• Wi-Fi partner links (select networking)

• http://technet.microsoft.com/en-us/lync/gg131938.aspx

• Interested in contacting Ixia • David Frost; dfrost@ixiacom.com or Ted Duffy;

tduffy@ixiacom.com

Demo

DemoVideo Call over “regular” access point, then show monitoring server reportVideo call over optimized access point, then show monitoring server report.

ThankYouThank You

© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.