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

2. March 2008
doc.: IEEE /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

3. 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/ x (if needed)
Harkirat Singh, et al., Samsung Electronics

4. 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

5. <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

6. 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

7. 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

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