2.4GHzis’Dead:’...Dead’Like’PIFS’ • Penetraon’ –...
Transcript of 2.4GHzis’Dead:’...Dead’Like’PIFS’ • Penetraon’ –...
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2.4GHz is Dead: Abandoning the 2.4GHz ISM Band for Greener Wi-‐Fi Pastures
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At Least on Life Support..
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Dead Like PIFS
• PenetraDon – 2.4GHz has 4.3X beGer penetraDon in open space than 5GHz
• Interference – Modulated and unmodulated devices – Too many devices on a channel raises the noise floor
• Frequency Space – 3 non-‐overlapping channels – No wide channels possible – Bounded on top and boGom by licensed bands
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PenetraDon
2.4GHz penetrates open space 4.3X beGer than 5GHz
2.4GHz
5GHz
Too much penetraDon (limits channel reuse)
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Interference
Too much interference in the band, and quickly geVng worse
IoT brings with it 30+ Billion* always-‐on devices and 200+ Billion intermiGently-‐connected devices by 2020. Many of these devices will use 2.4GHz (Bluetooth, Zigbee, Wi-‐Fi).
*Sources: Gartner & IDC
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Frequency Space
2.4GHz supports 3 non-‐overlapping channels
Not enough channel space (limits channel reuse)
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Noise Floor Whether hundreds of probing Wi-‐Fi staDons or wideband interference, if the noise floor is high, performance will be poor.
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Importance of Channel Reuse
• ApplicaDon Performance • System Capacity • User Experience
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Co-‐Channel ContenDon (CCC) Football Field (120 Yards, 110 Meters) PerspecDve: 1mW (0dBm) in open space
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Receive SensiDvity Many of today’s Wi-‐Fi chipsets have Rx SensiDvity below the actual noise floor at low data rates.
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Move CriDcal Wi-‐Fi to 5GHz It’s common that 5GHz channels are either unused or lightly used
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5GHz by Contrast
Source: Wireless Training & SoluDons
25 non-‐overlapping channels, with 12 more proposed by the FCC
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What Now? • Move to 5GHz, now. OpDmize for performance. • Use channels supported by your client devices. • Move client devices to 5GHz 11ac when possible. • Do not buy 2.4GHz-‐only client devices of any kind. • Use a performance-‐opDmized, transiDonal 2.4GHz SSID • Set organizaDonal policy to avoid use of 2.4GHz • Set expectaDons for 2.4GHz users (whether corporate or BYOD)
• Monitor the 2.4GHz spectrum at L1 & L2 (WIPS)
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Time’s Up!
Learn more in my new white paper: h"p://divdyn.net/docs/2.4-‐GHz-‐is-‐Dead-‐v1.00.pdf