NIBM POWER1
National Institute of Business Management
Chennai - 020
EMBA/ MBA
Elective: Power Management (Part -1) – SOLUTION.
1.In computing Power management is known as PC power management and is built around a standard called ACPI. Explain
Power management is a feature of some electrical appliances, especially copiers, computers and computer peripherals such as monitors and printers, that turns off the power or switches the system to a low-power state when inactive. In computing this is known as PC power management and is built around a standard called ACPI. This supersedes APM. All recent (consumer) computers have ACPI support.
Power Management Techniques
The previous section discussed WLANs and WPANs and the various standards that exist for them. The differences between each type of network were introduced with an emphasis put on their requirements for performing power management that each of them have. This section discusses the various power management techniques used by these standards for reducing the power consumed in each type of network. Many of the techniques introduced in this section do not appear in any of these standards, but are used in common practice to reduce the power of devices in both WLANs and WPANs. These techniques exist from the application layer all the way down to the physical layer of a traditional networking protocol stack. Techniques specific to a particular type of network are annotated as appropriate.
Application Layer
At the application layer a number of different techniques can be used to reduce the power consumed by a wireless device. A technique known as load partitioning allows an application to have all of its power intensive computation performed at its base station rather than locally. The wireless device simply sends the request for the computation to be performed, and then waits for the result. Another technique uses proxies in order to inform an application to changes in battery power. Applications use this information to
Chennai - 020
EMBA/ MBA
Elective: Power Management (Part -1) – SOLUTION.
1.In computing Power management is known as PC power management and is built around a standard called ACPI. Explain
Power management is a feature of some electrical appliances, especially copiers, computers and computer peripherals such as monitors and printers, that turns off the power or switches the system to a low-power state when inactive. In computing this is known as PC power management and is built around a standard called ACPI. This supersedes APM. All recent (consumer) computers have ACPI support.
Power Management Techniques
The previous section discussed WLANs and WPANs and the various standards that exist for them. The differences between each type of network were introduced with an emphasis put on their requirements for performing power management that each of them have. This section discusses the various power management techniques used by these standards for reducing the power consumed in each type of network. Many of the techniques introduced in this section do not appear in any of these standards, but are used in common practice to reduce the power of devices in both WLANs and WPANs. These techniques exist from the application layer all the way down to the physical layer of a traditional networking protocol stack. Techniques specific to a particular type of network are annotated as appropriate.
Application Layer
At the application layer a number of different techniques can be used to reduce the power consumed by a wireless device. A technique known as load partitioning allows an application to have all of its power intensive computation performed at its base station rather than locally. The wireless device simply sends the request for the computation to be performed, and then waits for the result. Another technique uses proxies in order to inform an application to changes in battery power. Applications use this information to