Per-User Data Rate, Band and Bandwidth Options for VHT July 2007 doc.: IEEE 802.11-07/2090r0 September 2007 Per-User Data Rate, Band and Bandwidth Options for VHT Date: 2007-09-20 Authors: Slide 1 Jason A. Trachewsky, et. al. (Broadcom Corporation) Eldad Perahia (Intel)

What Per-User Data Rates Do We Want to Support? 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)

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)

Band Challenges < 6 GHz > 57 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)

The 5-6 GHz Regulatory Situation U-NII Low/Middle Bands and ETSI Low Band U-NII High Band 30 20 30 MHz 20 20 20 MHz 5150 5350 MHz 5725 5825 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)

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)

The Worldwide 60 GHz Regulatory Situation Geographically Available 60 GHz Spectrum & Power 57 58 59 60 61 62 63 64 6 5 GHz 59.4 62.9 Australia Canad a Japan USA Other Considerations Output Power Region Min. BW = 100 MHz 500 mW peak 47 dBi max Ant. Gain +50, - 70% Pow . Change OT&TTR 10 into Antenna Canada 150 W peak EIRP 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)

60 GHz Regulatory Issues Focus: EU Frequency band Maximum transmit power Duty cycle Channel spacing Notes A minimum spectrum requirement of 500 MHz is requested. +57 dBm e.i.r.p. (+20 dBm nominal with up to +37dBi antenna gain or +10 dBm nominal with up to +47dBi antenna gain) No restriction The transmit power is necessary to offset oxygen and material attenuation at this band, and is typical for gigabit commercial product in this band NOTE: A license-exempt scheme is proposed to the National Regulatory Authorities for applications other than aeronautical mobile and inter-satellite communications. Users may not claim protection from interference from other users within the same spectrum for this kind of application. Jason A. Trachewsky, et. al. (Broadcom Corporation)

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)

Simple 60 GHz Link Budget Example 1 2 3 4 5 6 7 8 9 10 11 Range (m) Practical Capacity (bps) 60 GHz Practical Capacity - 2 GHz Channel, IBM Model -3 sd shadowing mean +3 sd shadowing 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)

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.