Portable computing platform having multiple operating modes and heterogeneous processors

What is this patent about?

’350 is related to the field of power management and operational efficiency in portable computing devices. Traditional laptops often suffer from limited battery life because they rely on high-performance processors to handle all tasks, regardless of the computational intensity. While standard power-saving techniques like sleep modes or frequency scaling exist, they often fail to provide a seamless user experience when a device needs to remain partially active for background tasks or low-intensity communication functions.

The underlying idea behind ’350 is the use of a heterogeneous multi-processor architecture to dynamically match hardware capabilities with specific software demands. Instead of relying on a single CPU to scale its power, the system incorporates multiple processors with different performance profiles and power footprints. By selectively routing application instructions to the most appropriate processor based on user preferences or the current task, the system can maintain functionality while significantly reducing energy consumption during low-demand periods.

The claims of ’350 focus on a portable system architecture featuring at least two heterogeneous processors and a dedicated wireless module containing its own independent processing unit. The independent claims describe a power management unit that selectably transitions the system between modes, allowing one processor to execute application software while the other is placed in a reduced power state. Crucially, the wireless module includes a third processor and a digital signal processor that are physically separate from the main application processors, enabling communication tasks to persist even when the primary computing cores are inactive.

In practice, the invention works by utilizing a centralized I/O hub to distribute transactions between the various processors and peripheral devices like displays and storage. For instance, a high-power x86 processor might handle intensive gaming or video editing, while a lower-power secondary core takes over for simple word processing or web browsing. The system can even operate in a telephony-only mode where the main processors are powered down, and the user interacts with a secondary, low-resolution display driven by the wireless module's internal processing unit.

This approach differs from prior solutions by moving beyond simple clock-speed throttling to a hardware-level task migration strategy. By integrating a third, independent processor within the wireless module, the system can function as a mobile phone or PDA without waking the energy-hungry main system components. This tiered processing hierarchy, combined with the ability to switch between high-resolution and low-resolution displays, allows the device to optimize its power profile based on the specific type of application software currently in use.