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1 voice and video over wi fi-balajee krishnamurthy
1.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 1 #airheadsconf#airheadsconf Voice and Video over Wi-Fi Balajee Krishnamurthy 26th February, 2013
2.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 2 #airheadsconf Multimedia over WLAN Challenges Generic Design Recommendations for Multimedia Aruba Enablers for Voice Aruba Enablers for Multicast Video Enterprise Application – Lync Agenda
3.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 3 #airheadsconf Understanding Mobility Requirements Virtual Desktops Collaboration Multimedia Mobile Devices
4.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 4 #airheadsconf • Generic Challenges over WLAN – RF Design – End-to-End QoS – Roaming & Battery Life – Scaling Challenges • Voice – Bandwidth Management/call admission control – Mobility and roaming • Video – Unreliability – Low speed TX • Voice + Video + Data -> ?? Multimedia over WLAN Challenges
5.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 5 #airheadsconf#airheadsconf5 RF Design Consideration
6.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 6 #airheadsconf NOT ALL deployments are the same • Normal vs. Tough – Reflective, Absorptive etc. – Height of the ceiling • Wall Mount vs. Ceiling Mount – Propagation characteristics vary with orientation – Antenna pattern plays a big role • Indoor vs. outdoor – Difference in MIMO characteristics • Choosing AP’s and antennas • Clean vs. dirty RF – Dirty RF can be Non 802.11 and Cellular Interference • 5 GHz vs. 2.4 GHz – Always use 5 GHz • 11ac vs. 11n vs. 11abg deployments – Design considerations
7.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 7 #airheadsconf RF 101 - Plan for Capacity," NOT” Coverage • Capacity Vs. Coverage – 20 – 30% overlapping coverage • Design coverage cells keeping mobile device TX power in mind – ~ -65 dBm bi-directional power
8.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 8 #airheadsconf AP Placement – What & What not? • Define the coverage area for users – Consider an all wireless, mobile office • Never make assumptions – Devices are not ties to cubes anymore • Gather Expectations from end users – You will be surprised
9.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 9 #airheadsconf AP Placement impacts roam! • Clients need to scan effectively • AP placements play a role in successful device scans • Hidden APs may not be visible to devices
10.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 10 #airheadsconf • You might have to support more than one app – Mix of personal and corporate applications • Design for the highest bandwidth demand that you intend to support • Multiply this number by the number of connections that you need to support How much bandwidth do I need on my network? Personal Apps Throughput FaceTime 400 Kbps AirPlay Video 1 Mbps Netflix 1.5 Mbps* Pandora 150 Kbps YouTube 500 Kbps Skype 500 Kbps HTTP 500 Kbps Corporate Apps Throughput Lync Desktop Sharing 1.5 Mbps SIP Softphone 90 Kbps Citrix Internet + Office 150 Kbps Webex iPad Desktop Share 250 Kbps WebEx High Quality Video 1.5 Mbps GoToMeeting Desktop Share 500 Kbps Desktop Backup 10 – 50 Mbps Printing 1 Mbps
11.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 11 #airheadsconf What wireless protocol do I need to support these apps? Standard Goodput for TCP traffic (approximate) 802.11g 25 802.11a 25 802.11n (HT 20 MHz 1SS MCS 7) 35 802.11n (HT 20 MHz 2SS MCS 15) 80 802.11n (HT 40 MHz 2SS MCS 15) 150 802.11n (HT 40 MHz 3SS MCS 23) 230 802.11n (HT 20 MHz 3SS MCS 23) 140 • Channel is the bottleneck, plan for it • 1SS vs. 2SS vs. 3SS • 11b vs. 11a/b/g vs. 11n vs. guess what “11ac” • Client devices change maximum throughput, due to inherent capabilities, understand device profile
12.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 12 #airheadsconf • The denser the APs, the higher the required data rate • If the AP deployment is not dense, the lower data rates may be necessary to provide Coverage – For e.g. With the G711 codec and the overhead of the 802.11 protocol, the cell throughput does not increase at data rates above 24Mbps Influence of Data Rates on Bandwidth
13.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 13 #airheadsconf Effect of ACI on a capacity based design • Good RF Design • Limit AP transmit power • ARM adapts to dynamic changes
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CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 14 #airheadsconf Effect on CCI on a capacity based design • Good RF Design • Limit AP transmit power • Channel re-use management – Intelligent rate adaptation
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CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 15 #airheadsconf Find out how the devices behave 22.8 20.1 9.1 8.2 30.2 25 12.9 4.6 15 feet 35 feet 75 feet 120 feet 5 GHz TCP Download iPad Android 19.2 13.2 6.4 7.3 31.7 21.7 6.5 5 15 feet 35 feet 75 feet 120 feet 5 GHz TCP Upload iPad Android • BYOD vs. Corporate devices • Identify the devices that are used in the enterprise • 1SS vs. 2SS vs. 3SS • TX/Rx Characteristics • Test with the device that you expect to see
16.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 16 #airheadsconf • Channel Utilization levels should be kept under 50% on an average. • Noise levels should not exceed -90 - 95 dBm, which allows for a Signal to Noise Ratio (SNR) of 25 dB where a -65 dBm signal should be maintained. Channel Utilization and Noise
17.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 17 #airheadsconf#airheadsconf17 Aruba’s RF Enablers
18.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 18 #airheadsconf 802.11n + ARM -> Assured Bandwidth
19.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 19 #airheadsconf#airheadsconf19 Aruba’s QoS Enablers
20.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 20 #airheadsconf • Distributed Coordinated Function (DCF) – Transmission rules followed by all client • Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) – Responsible for mediating access to the air 802.11 Access Rules Basics
21.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 21 #airheadsconf End-to-End QoS Tagged DSCP Tagged DSCP WLAN / strict queuing Tagged DSCP WLANTagged DSCP Bandwidth Management / Queuing Bandwidth Management / Call Admission Control Application Aware RF ManagementUpstream Downstream Transport Edge (GRE encapsulated) WirelessCore
22.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 22 #airheadsconf Access Categories with EDCA 1. Voice Data 2. Video Data 3. Best Efforts 4. Background Air High Priority Low Priority Application Data 1. WMM Specifies how priority queues map to DSCP and dot1P tags 2. Different access categories, different contention parameters 3. 4 queues per radio; 8 queues total; supported on all APs 4. Voice and video gets priority over data 5. EDCA parameters decides a unique delay and random back off for each queue
23.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 23 #airheadsconf ALGs: Voice Separation by Firewall 1. ALG support for most common voice protocols 2. ALGs include - SIP, SCCP, H323, NOE, Vocera etc. 3. Constantly adding newer ALGs
24.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 24 #airheadsconf Client Battery Life Challenges! 1. WMM UAPSD support – increased power saving, increased cell capacity 2. Distribute TIM so that clients need not receive every beacon frame (~100 ms) 3. With Proxy ARP controller responds to ARP requests enabling clients to sleep longer 4. Traffic filtering at the AP to avoid extraneous multicast/broadcast frames
25.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 25 #airheadsconf Scaling Challenges: VLAN Pooling 1. Aruba VLAN Pooling allows a set of VLANs to be assigned to a designated group of users 2. Can use VLANs that already exist in the enterprise 3. Enables IP address and session persistence
26.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 26 #airheadsconf Bandwidth Management! Implementation Rules! – Per role-based bandwidth contract" – Per user-based bandwidth contract" – Per SSID-based bandwidth contract"
27.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 27 #airheadsconf#airheadsconf27 Aruba Enablers for Voice
28.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 28 #airheadsconf Voice Aware Firewall • 13- 28 What is needed
29.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 29 #airheadsconf Voice Aware RF Scanning • 13- 29 No active voice calls • scanning on other channels • No noticeable effects on data clients Has an active voice call • Suspends RF scanning on other channels • No noticeable effects on voice calls • No noticeable effects on data calls
30.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 30 #airheadsconf Voice Aware Load Balancing (Advanced CAC) • 13- 30 Mobility Controller AB AP 3 C IP PBX Roaming Voice Voice Data Initial Threshold Handover Threshold Data Reserve A. Mobility Controller monitors the number of active (off-hook) voice calls on each AP. Access Point (AP) number 2 reaches the Initial Threshold, so additional VoWLAN devices that initiate calls are load-balanced to adjacent AP until the number of active calls on AP 2 drops below the Initial Threshold value B. A VoWLAN device with an active call moves from AP 1 to AP 2. Because bandwidth is reserved for roaming voice (Handover Threshold), the call is seamlessly handed off C. A reserve for data clients ensures network availability and performance, even with high VoWLAN activity AP 2AP 1 Voice Reserved Bandwidth
31.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 31 #airheadsconf 13- 31 Voice Aware 802.1x / 802.11i! Time Line Active VoIP call Re-keying is pushed out until the call terminates Re-keying interval
32.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 32 #airheadsconf 13- 32 Voice Aware Mobility! This controller is the HA for the device on call This controller is the HA for the device on call All new calls are routed directly out of the new HA 1/ As the device on call moves, the HA remains the same to ensure security and session awareness 2/ When the call disconnects, the new controller takes over as HA. The client’s IP address will also change if the move is a L3 move
33.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 33 #airheadsconf 13- 33 WAP Fast Handover / OKC! WPA fast handover ! – Allows certain WPA clients to use a preauthorized PMK, " – Significantly reducing handover interruption. " – Client devices may/may not support this feature. " – This feature is disabled by default." OKC (opportunistic key caching) supports WPA2 clients! – Allows WPA clients to use a preauthorized PMK" – Allows clients faster roaming without a full 802.1x authentication" – Client devices should support this feature" – Enabled by default"
34.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 34 #airheadsconf Extending Voice to Remote Locations • 13- 34 Remote Location Corporate HQ Internet Services Internet Gateway DMZ Firewall/NAT IPSec Tunnel All security policies centrally defined and enforced at the mobility controller INTERNET IPSec/3DES Encrypted Control Channel WPA2/AES Encrypted Data Channel GUEST CORP CORP VOICE VOICE Aruba AP connected to any Ethernet jack with Internet connection
35.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 35 #airheadsconf 13- 35 Troubleshooting procedure for Voice! – Audio quality related Issues" • Check RF health: RSSI for the client, PHY rates being used for transmission, Retry percentage " – Packet-capture" – Location of client" • Checking on the floorplan for the location of the client and which AP it is associated to. " • In most cases, voice issues are because of sticky clients." – Adequate coverage " • Check the floorplan and ensure adequate coverage in the area where there are user complaints." – Firewall for Voice" • Check if the voice protocol is being identified and tagged appropriately by the firewall." – Check ARM and SSID settings " • make sure they are right for voice." – Roaming" • If the issues are related to roaming, that will show up with auth-tracebuf and show ap debug management-frames debug commands. " – Dropped Calls, " • looking for CAC related reasons is useful."
36.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 36 #airheadsconf#airheadsconf36 Aruba Enablers for Voice: 11k, 11r, 11v
37.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 37 #airheadsconf Mobility & Roaming: Enterprise Voice Certification (Co-operative Client Control)! Real time data collection with 802.11k • Neighbor Report (Client Side) – Beacon Report (AP side) Neighbor Report Response Neighbor Report Request Beacon Response Beacon Request
38.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 38 #airheadsconf Mobility & Roaming: Enterprise Voice Certification! 1. Minimize delay in a clients transition from one BSS to another 2. Establishment of Security and QoS states at the target AP prior to/during association 3. Reduces handover delays to up to 50 ms, enhances voice performance 4. Requires support on the WLAN and the client side The handover delay from one AP to the other is reduced significantly; security and QoS states synchronized before roam
39.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 39 #airheadsconf BSS Transition Management Query With 802.11v, AP encourages clients to roam to the best AP utilizing information from 11k, 11r – Encouraging the client to perform a directed BSS transition – Uses the system level view obtained by the beacon and neighbor reports from 11k – Helps in admission control – Requires WLAN and client support Mobility & Roaming: Enterprise Voice Certification!
40.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 40 #airheadsconf#airheadsconf40 Aruba Enablers for Video
41.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 41 #airheadsconf Multicast – Why & Why not? Benifits Efficiency – reduced network traffic, reduced server and CPU load Performance – eliminates traffic redundancy Application – enabled distributed applications for different verticals Challenges Best effort Delivery, no QoS guarantees – poor quality, drops are to be expected No error correction – fire and forget Sent out at low control rates; 1 MB for b/ g, 6 Mb for a Impact • Does not utilize 802.11 N High Throughput data rates • Heavy utilization of channel due to high rate of very slow packets • Video delivery is not reliable causing poor Quality of Experience
42.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 42 #airheadsconf Wired Optimization with IGMP
43.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 43 #airheadsconf Multicast to Unicast Conversion Dynamic Multicast Optimization (Conversion at the WLAN Controller) Distributed Dynamic Multicast Optimization (Conversion at the AP)
44.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 44 #airheadsconf Multicast Rate Optimization 24 Mbps 24 Mbps 24 Mbps 6 Mbps 6 Mbps 6 Mbps Multicast Rate Optimization Without any special tuning, multicast packet will be sent at either ‘basic rate’ or ‘support rate’ whichever is lower. For example, if I have the following: 802.11a Basic Rates 18 24 802.11a Transmit Rates 6 9 12 18 24 36 48 54 Multicast/Broadcast packet will be sent at 6 Mbps since it’s the lowest of all rates. This applies to ‘N’ as well. Basic Rate
45.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 45 #airheadsconf DMO will not scale in an environment like this..
46.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 46 #airheadsconf 13- 46 Troubleshooting procedure for Video! – Video quality related Issues" • Check RF health: RSSI for the client, PHY rates being used for transmission, Retry percentage " – Packet-capture" – Location of client" • Checking on the floorplan for the location of the client and which AP it is associated to. " • In most cases, voice issues are because of sticky clients." – Adequate coverage " • Check the floorplan and ensure adequate coverage in the area where there are user complaints." – IGMP data" – Firewall for Video" • Check if the voice protocol is being identified and tagged appropriately by the firewall." – Video (CBR or bursty)" – Check ARM and SSID settings " • make sure they are right for voice."
47.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 47 #airheadsconf#airheadsconf47 Enabling Enterprise Apps: Lync
48.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 48 #airheadsconf Improve Your Lync over Wi-Fi Experience Application Layer Controller Layer Infrastructure Layer ArubaMOVE Architecture
49.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 49 #airheadsconf Improve Lync Integrity & Security
50.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 50 #airheadsconf Call Admission Control for Lync Aruba implements bandwidth- based and call-count based CAC • Benefits • Prevents oversubscription • Higher data throughput • Fewer dropped calls • Avert voice traffic congestion
51.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 51 #airheadsconf Improved Lync Diagnostics Client Application Monitoring • User, Device and Application Visibility • Application Bandwidth Utilization • Wi-Fi performance and usage summary • System-, Wi-Fi AP-, and Client-level Reporting Lync Diagnostics • Call Quality Metrics for All Lync Wi-Fi Calls • Detailed Call Information • Caller/callee, information, call status, call type, active client sessions at the time of call • Call Detailed Reports with Client Roaming History • Improved Client Debug ability
52.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 52 #airheadsconf Lync Monitoring on Controller Dashboard
53.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 53 #airheadsconf
54.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 54 #airheadsconf#airheadsconf Thank You
55.
CONFIDENTIAL © Copyright 2013.
Aruba Networks, Inc. All rights reserved 55 #airheadsconf#airheadsconf55
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