Potential Benefits of Dual-radio VHT Systems March 2008 doc.: IEEE 802.11-08/xxxxr0 March 2008 Potential Benefits of Dual-radio VHT Systems Date: 2008-03-18 Authors: Harkirat Singh, et al., Samsung Electronics Harkirat Singh, et al., Samsung Electronics

March 2008 doc.: IEEE 802.11-08/xxxxr0 March 2008 Abstract [ 60GHz band provides the potential for multiple Gigabit data rate with limited coverage. On the other hand, <6GHz provides a larger coverage but limited data rate increase. The main objective of this presentation is to share some thoughts on how the two radios can complement each other.] Harkirat Singh, et al., Samsung Electronics Harkirat Singh, et al., Samsung Electronics

Pros and Cons of 60GHz band March 2008 Pros and Cons of 60GHz band Pros Cons Easy to achieve >1Gbps per-link throughout Large (7GHz) contiguous bandwidth Small form factor Antenna spacing (λ/2) ≈ 0.25cm Support directional transmissions and opportunities for spatial reuse Relatively simple transceivers design Not necessary to achieve high spectral efficiency Limited coverage due to severe path loss and obstruction Difficult to provide same user experience as .11x without additional improvement Needs additional radio for backward compatibility w/ 802.11x (if needed) Harkirat Singh, et al., Samsung Electronics

Dual-radio VHT systems March 2008 Dual-radio VHT systems VHT STA includes two radios: 60GHz radio and <6GHz radio <6GHz radio also covers other 11x radios When operating at 60GHz and is blocked, fallback to <6GHz. It is like 11n falls back to 11a/g <6GHz radio may provide backward compatibility with 11x (such as 11n/..) Harkirat Singh, et al., Samsung Electronics

<6GHz assists 60GHz March 2008 <6GHz facilitates in: <6GHz transmission range 60GHz directional transmission AP <6GHz facilitates in: Quickly disseminating some time critical info such as neighbor table, scheduling of 60GHz links, etc. Boosting aggregated throughput of 60GHz via SDMA (concurrent non-overlapping transmissions), MUD, etc. Harkirat Singh, et al., Samsung Electronics

Illustration March 2008 … <6GHz transmission range AP 3 Schedules, Neighbor info, etc. … Neighbor id Quality Angular … Neighbor id Quality Angular … (local view) Harkirat Singh, et al., Samsung Electronics

March 2008 Summary Presented some thoughts on the potential benefits of having both <6GHz and 60GHz radios together This results in: Enlarging 60GHz coverage Improving aggregated system throughput Enhancing user WLAN experience Harkirat Singh, et al., Samsung Electronics

March 2008 Thank you! Harkirat Singh, et al., Samsung Electronics