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Metro cells for capacity-driven mobile world, says AlcaLu CTO

Posted: 30 Aug 2012 ?? ?Print Version ?Bookmark and Share

Keywords:small cells? basestation chips? 80-fold factor? wireless networks?

The wireless networks of the near future will require a new breed of small-cell basestation chips designed specifically to cater to the ever evolving needs of users in terms of mobile data transfer speed, applications and even interface. This was the message Marcus Weldon, chief technology officer at Alcatel-Lucent, delivered to processor designers attending the annual Hot Chips conference at Cupertino, California.

"We are in a radical transition to a capacity-driven world served by Wi-Fi and small cells and away from a coverage world" using macro cellular basestations, Weldon said. "All the new chip set designs will have a focus on metro cells with a smaller emphasis on macro cells," he said.

"Small cells are the only way to get 80-fold factor in additional capacity that will be needed," he added.

Weldon predicted as many as 500 million tablet computers will be sold each year by 2017. They will, along with the rise in smartphones, drive the 80-fold increase in mobile data next-generation wireless networks will need to serve.

The needs are rising at a time when carrier's data revenues are relatively flat and their voice revenues are falling. He suggested carriers will look for ways to charge per connection and per service, especially for new ways of shifting into the digital realm traditional "analog" jobs in banking, health care and other domains.

"We are in a staring match between content and network people where no one has figured out the model to build the network with the money in the pot," said Weldon, pictured below. "It's the entire digital economy wallet we should look at," he said.

As for the chips, Weldon said basestation makers such as AlcaLu are transitioning from a mix of FPGAs, DSPs and multicore CPUs to a new class of SoCs from companies such as Cavium, Freescale, LSI and Texas Instruments. The SoCs integrate DSP, CPU and accelerator cores reducing as much as four-fold the number of chips on a card and amount of power the cards require.

"In future, we see a move toward SoCs using more general-purpose processor cores for Layer 2 and 3 jobs with some hardware accelerators for Layer 1" to better handle dynamic shifts in workloads, Weldon said.

"There's still a debate in the industry about how much pooling of baseband and core processing you can do and get reasonable performance," he said. "The core model is changing assumptions about what to do in real time and how much can be non-deterministic, this is something people are still working through," he added.

Telecom OEMs will need millions of the chips which could sell for $50-$100 each because the small cells will cost significantly more than $1,000, said Weldon in an informal discussion before his keynote. The chips need to support 3G, 4G and Wi-Fi and ideally should have some media processing capabilities to support content caching at the edge of the network, he said.

Weldon's comments set the stage for Cavium to present details about its latest small-cell processor Wednesday. It was followed by a talk from Qualcomm about its chips for femtocells, terminals used mainly in homes that lack good cellular coverage.

- Rick Merritt
??EE Times

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