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Gigabit WiFi: Utilising 802.11ac on CampusConsiderations and Benefits

Higher and Further Education Manager UK&IHenry Batten [email protected]

mailto:[email protected]

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Visibility of Uptake in the UK so far:

At the HEAnet show in Ireland October 2013 that was 1%


What’s in the 802.11ac Standard

• Very High Throughput (VHT) - up to 10x compared with11n

– Wider channels: 80MHz, 160MHz, 80+80MHz (4X)

– New modulation: 256-QAM(1.3X)

– More MIMO streams: up to 8(2X)

• Well defined Beam Forming

• Multi-User-MIMO (MU-MIMO)

4

802.11ac Standard Highlights


Data Rates in 802.11ac

5

20MHz 40MHz 80MHz 160MHz

1 stream 86.7 200 433.3 866.7

2 streams 173.3 400 866.7 1733.3

3 streams 288.9 600 1300 2340

4 streams 346.7 800 1733.3 3466.7

5 streams 433.3 1000 2166.7 4333.3

6 streams 577.8 1200 2340 5200

7 streams 606.7 1400 3033.3 4095

8 streams 693.3 1600 3466.7 6933.3

Delivered in the first generation of silicon

Rates in Mbps

802.11ac Data Rate Matrix


DFS

Not allowed in Europe

Wider channels: 80Mhz and 160Mhz

6

Available Channels for 802.11ac

48IEEE channel #20 MHz40 MHz

80 MHz

5170MHz

5330MHz

5490MHz

5730MHz

5735MHz

5835MHz

160 MHz

36 40 44 6052 64 116

56 136

132

124

120

108

100

104

128

112

165

161

157

140

153

Weather radar

Not allowed in North America

149

144

Dynamic Frequency Selection

Using DFS Channels Without DFS Channels

Channel Size US Europe US Europe

40 MHz 8 9 4 2

80 MHz 4 5 2 1

160 MHz 1 2


Standard Bandwidth Spatial Streams PHY Data Rate Real Throughput

802.11a 20 MHz 1 54 Mbps 24 Mbps

802.11n 20 MHz 1 65Mbps 46 Mbps

802.11n 40 MHz 2 300 Mbps 210 Mbps

802.11n 40 MHz 3 450 Mbps 320 Mbps

802.11ac Phase I 80 MHz 1 293Mbps 210 Mbps

802.11ac Phase I 80 MHz 2 867 Mbps 610 Mbps

802.11ac Phase I 80 MHz 3 1300 Mbps 910 Mbps

802.11ac Phase II 160MHz 1 867 Mbps 610 Mbps

802.11ac Phase II 160 MHz 2 1730 Mbps 1200 Mbps

802.11ac Phase II 160 MHz 3 2600 Mbps 1800 Mbps

802.11ac Phase II 160 MHz 8* 6933 Mbps 4900 Mbps

* There are no commercial implementations that use more than 3 spatial streams

Data Rate Table


Thank You

Power and space challenges are still the same • Don’t expect more than 3 data streams soon (-)• Higher rates available at ranges closer to the AP (-)• Higher throughput efficiency mean less time (power) spent for transmit (+)• Users will still observe greater net throughput (+)

Rate and Range


Questions?

Predicted Uptake

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Beamforming

• Introduced in 802.11n• 802.11n had many options – no vendor implemented it• 802.11ac uses a single standard for beam forming

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• By changing time (phase) of 3 transmitters, 802.11ac AP’s can create a “constructive interference” transmit beam-forming waveform (TxBF) and generate a stronger signal that clients can hear better.

AP3rd Stream

2nd Stream

1st Stream

AP

Destructive Interference, when three streams of RF energy cancel each other

11ac AP

3rd Stream

2nd Stream

1st Stream

Constructive Interference, when three streams of RF energy stack up each other

11acAP

Without Beam-forming

With Beam-forming

Beamforming


AP

A standard 3x3:3SS 802.11n AP effective coverage at

different modulation rates

802.11n 64 QAM coverageTop rate @ 450 Mbps




GbE Zone

802.11ac 256QAM 64 QAM Top rate @ 1330 Mbps

Where can I access

my Wi-Fi?

User is outside of RF coverage zone with lowest RX Z(e.g. -90 dBm receiving sensitivity)

User is within RF coverage zone with due to reconstructed radio coverage (due to different phase)

AP

832

Beamforming


Multi-User MIMO

• Allows a sophisticated AP (#Antennas > #Streams) to maintain high throughput even when the clients are simple (smartphones, tablets, etc…)

• Up to four simultaneous clients, each with one or more antennas, transmit or receive independent data streams

• Needs MU-MIMO beam forming support

• Provides better channel reuse in single channel, enables high client density – 4 x density

• Expected only in the second generation of silicon

13


• Survey/Plan for 5GHz coverage– Old AP placements are probably based on old requirements

– Higher signal strength requirement for 256QAM data-rates

• 40 or 80MHz Support– Highest data rates are only available with 80MHz channels

– Not all vendors are recommending 80MHz channel widths due to architectural constraints

• 802.3af/at PoE PD Support– Some solutions require 802.3at PoE+ to operate at full performance

• Multiple GigE ports per AP– Worth considering provision, but not a must-have

– Possible more benefit for resilience than performance

802.11ac Design Considerations


802.11ac Benefits

• Higher data-rates than 802.11n– Gen 1 802.11ac AP’s offering 1.3Gbps vs 450Mbps on 11n

• Greater density– Higher data-rates mean clients need less time to complete their data

transfers. Leaves more space for more clients

– Gen 2 AP’s will add MU-MIMO capability

• Better ‘n’ than ‘n’– Testing from multiple vendors has shown an increase in performance in

802.11n chipsets when used on 802.11ac infrastructure - no need to wait for benefits

• Power consumption benefits on client devices– More efficient transmissions lead to lower battery requirements


Bonjour!A friendly greeting, or death to your network?

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Bonjour - Many Challenges

• Advertisement Problems – Bonjour is local only, designed for home use– Others use multicast

• Scalability Issues– Bonjour doesn’t scale due to

• Location Challenges– Which services are relevant

• Policy and Control– Who should advertise services?– Who should learn about services?


Service Control in Action (Bonjour)

Discover Consolidate Distribute Advertise

Po

licy

Po

licy

POLICY CONTROLLED SERVICE DISCOVERY & ADVERTISEMENT


Service Control – Use Case

19

Administration Building Liberal Arts Building

ESSID: student

ESSID: staff

vlan 700Vlan 600


Service Control - Discovery

20


ESSID: student

ESSID: staff

vlan 700Vlan 600

Global Service Discovery List

Liberal Arts - Apple TV

Liberal Arts - Printer

Admin Bldg - Printer


Service Control Policy - Faculty

21


ESSID: student

ESSID: staff

vlan 700Vlan 600

Liberal Arts - Apple TV




Service Control Policy - Student

22


ESSID: student

ESSID: staff

vlan 700Vlan 600

Global Service Discovery List Liberal Arts - Apple TV




Questions???


Thank You

meru proprietary information. © copyright 2013. meru networks, inc. all rights reserved. gigabit...

Documents

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meru proprietary information

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ac standard highlights

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ac data rate matrix

data streams