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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 [email protected]• 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; [email protected] or Ted Duffy;
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.