For example, smartphones today contain basically a single compute system, with one type of CPU and some memory attached. But the tasks performed by smartphones, such as making a call or playing a 3D game, require very different levels of performance.

So in the future, MulIer said, "some systems will have entire subsystems within them, including their own CPU and their own memory," devoted to a particular task such as music playback. That way, other subsystems in a device can be shut down, conserving battery life.

It's a model ARM is already pursuing with its Big.Little architecture . That design will see two types of processor core in the same device, one powerful and one less so, and uses the most power-appropriate device for the task at hand. The idea of entire subsystems takes that a step further.

The bandwidth gains in 2020 will come mostly from advances in topology, according to Muller -- basically increasing the number of cellular base stations. Spectrum, and the technologies used to send bits across that spectrum, won't advance much, he predicted.

That's okay for people in cities, where it can make financial sense to install more base stations. "If you're out in the middle of nowhere, I'm sorry, there's not going to be much big change for you," Muller said.