Prakash Sangam Director, Technical Marketing, Qualcomm

This post is by Prakash Sangam Director, Technical Marketing, Qualcomm

On March 1st and 2nd 2014, the eyes and ears of NASCAR fans were on the NASCAR Sprint Cup Series race being held at Phoenix International Raceway in Arizona (PIR). While fans were nervously biting their nails during the race and cheering ecstatically when their favorite driver pulled off a pass, we at Qualcomm joined them. Admittedly, we were not there only to see the spectacle of NASCAR. Phoenix International Raceway was the venue for the joint trial among Sprint, NASCAR and Qualcomm Technologies. The companies were stress-testing and validating the “hyper-dense small cells” concept and our “UltraSON” suite of features. And when the results were in, we were as ecstatic—perhaps more so than the fans of the winning car and driver.

As clearly understood in the wireless industry, dense deployment of small cells everywhere—indoors and outdoors, at residences, in enterprises, shopping malls etc., is needed to address the traffic growth (aka 1000x challenge). Such hyper-dense deployments are only possible with an unplanned, ad-hoc approach, without any detailed RF planning. Obviously, this approach has inherent challenges such as interference, reliable mobility etc.

Qualcomm Technologies’ UltraSON solves these challenges. For example, its mobility management feature reduces “ping-pong” between cells and increases reliability. Its interference management techniques add robustness to the system and thereby enable the capacity to scale with densification. And there are many such features that are beyond what the standards recommend.

small cells qualcomm ultraSON

We have been testing UltraSON in our labs and on our over-the-air system and wanted to prove its worth in a real-life situation. But what we got at PIR was one of the harshest RF environments possible—large trucks acting as reflectors and obstacles, and constantly moving vehicles and people made it very dynamic. Not to be deterred, we deployed what may be the densest small cell network in the world, with an equivalent  density of 1000 cells/km2, built with Airspan’s LTE-Advanced picos, powered by Qualcomm Technologies’ small cell chipsets and UltraSON. Additionally, the network had to be deployed in a very short time (1-2 days), which meant no prior planning, and thus enabled us to demonstrate how UltraSON adapts to unplanned deployments.

Our extensive experience testing UltraSON gave us a lot of confidence, and going into the event we felt more than ready for the challenge. We felt like a knowledgeable fan betting on a reliable team, and our confidence was bolstered when UltraSON solved the challenges and kept system performance very high throughout the event.

The capacity carried by the network represented an increase of more than 40-times compared to the other alternative (cell-on-wheels) for the same amount of spectrum, offering a stunning 654 bps/Hz/km2 area spectral efficiency. More importantly, UltraSON reduced handovers by more than 50 per cent, significantly minimizing radio link failures and thereby providing an excellent user experience across many commercial applications.

So, the trial proved many things. Above all, it showed that “hyper-dense small cells” is not just a vision, but indeed real, and UltraSON plays a large part in making it so. As the saying goes, if it can work here (harshest conditions at PIR), it can work anywhere.

If you would like to learn more, visit; or hear us speak at Small Cells North America 2014 on April 2nd in New York.


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