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Per-User Data Rate, Band and Bandwidth Options for VHT

Per-User Data Rate, Band and Bandwidth Options for VHT. Authors:. Date: 2007-09-20. Slide 1. What Per-User Data Rates Do We Want to Support?. Per-User Data Rates 3-5+ Gbps New applications like wireless docking, thin clients, etc .

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Per-User Data Rate, Band and Bandwidth Options for VHT

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  1. Per-User Data Rate, Band and Bandwidth Options for VHT Authors: Date: 2007-09-20 Slide 1 Jason A. Trachewsky, et. al. (Broadcom Corporation)

  2. What Per-User Data Rates Do We Want to Support? • Per-User Data Rates • 3-5+ Gbps • New applications like wireless docking, thin clients, etc. • Supporting small numbers of users, probably non-simultaneous • 300-500 Mbps • Traditional WLAN applications • Supporting large numbers of possibly-simultaneous users • Must we choose? Jason A. Trachewsky, et. al. (Broadcom Corporation)

  3. Band and Bandwidth Options fc < 6 GHz fc > 57 GHz BW < 100 MHz BW > 100 MHz BW < 500 MHz BW > 500 MHz Data rate limit around 1 Gbps Data rates > 1 Gbps, fc > 5 GHz Data rate limit around 1 Gbps Data rates up to several Gbps Jason A. Trachewsky, et. al. (Broadcom Corporation)

  4. Band Challenges • < 6 GHz • Existing 802.11a and 802.11n users • 20/40/x (x = 80, 120, 160, ??) coex!! • Only about 100 MHz of spectrum available in some regulatory domains • > 57 GHz • No existing standardized communication systems • 802.15 TG3c is hard at work, defining WPAN in the 57-66 GHz band • Plan to use ~2 GHz at one time • Far greater path and materials absorption losses Jason A. Trachewsky, et. al. (Broadcom Corporation)

  5. 20 20 20 MHz The 5-6 GHz Regulatory Situation U-NII Low/Middle Bands and ETSI Low Band U-NII High Band 30 20 30 MHz 5725 5825 MHz 5150 5350 MHz lower* middle* upper band 40mW 200mW 800mW Pmax indoor indoor outdoor * +23 dBm EIRP for ETSI ETSI High Band 30 20 25 MHz upper band +30 dBm* EIRPmax * except for ch. 140 +23 dBm EIRP 5470 5725 MHz Additional channels from 4920 to 5080 MHz are defined only in Japan. Jason A. Trachewsky, et. al. (Broadcom Corporation)

  6. The 60 GHz Opportunity • Up to 9 GHz of unlicensed/licensed-free spectrum available in some regulatory domains (57-66 GHz). • This huge amount of spectrum available at reasonably-high to very high power spectral density and EIRP. •  the possibility of actually achieving > 1 Gbps on the air at > 1 m range! Jason A. Trachewsky, et. al. (Broadcom Corporation)

  7. Geographically Available 60 GHz Spectrum & Power GHz 6 6 59 60 61 62 63 64 57 58 5 6 Australia 59.4 62.9 Canad a 57 64 Japan 59 64 USA 57 64 Region Region Output Power Output Power Other Considerations Other Considerations Australia Australia 10 10 mW mW into Antenna into Antenna 150 W peak EIRP 150 W peak EIRP Canada Canada 500 500 mW mW peak peak Min. BW = 100 MHz Min. BW = 100 MHz Japan Japan 10 10 mW mW into Antenna into Antenna 47 47 dBi dBi max Ant. Gain max Ant. Gain +50, +50, - - 70% 70% Pow Pow . Change OT&TTR . Change OT&TTR USA USA 500 500 mW mW peak peak Min. BW = 100 MHz Min. BW = 100 MHz The Worldwide 60 GHz Regulatory Situation Note: China currently has no 60 GHz regulations and there is no effort under way in China to put 60 GHz regulations in place. Jason A. Trachewsky, et. al. (Broadcom Corporation)

  8. 60 GHz Regulatory Issues Focus: EU Jason A. Trachewsky, et. al. (Broadcom Corporation)

  9. 60 GHz Propagation and Link Budget Summary • Relative to 5 GHz band • 60 GHz has 6-10 times the available bandwidth • 21 dB additional path loss (excluding shadowing effects) • 6 - 10 dB less transmitter power* • greater antenna gain (and more elements) possible in small volumes • significantly greater loss through building materials • Near-term significantly greater cost • LOS channels at limited range can achieve data rates > 2 Gbps with simple transceivers • NLOS channels can also achieve > 2 Gbps rates, but will require higher-complexity transceivers * This is not a fundamental limit and certainly may be debated. Jason A. Trachewsky, et. al. (Broadcom Corporation)

  10. 60 GHz Practical Capacity - 2 GHz Channel, IBM Model 11 10 -3 sd shadowing mean +3 sd shadowing 10 10 Practical Capacity (bps) 9 10 8 10 1 2 3 4 5 6 7 8 9 10 Range (m) Simple 60 GHz Link Budget Example • Ptx = +10 dBm • Gtx = +10 dBi • Grx = +10 dBi • Ntx = Nrx = 1 • NF = 8 dB • Gap from capacity = 7 dB • Even with severe shadowing, 1 Gbps at 2 m is feasible with one antenna. Channel parameters from private home model, 802.15 06/191 Jason A. Trachewsky, et. al. (Broadcom Corporation)

  11. Going Forward • VHT SG needs to limit the scope of possible bands, bandwidths and per-user data rates to consider. • Practical band choices include 5-6 GHz and 57-66 GHz.

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