MOBILE POWER CONSERVATION

INTRODUCTION:

· In today’s world of mobile communications, one of the most precious commodities is power. The mobile can only operate as long as its battery maintains power.

· Most software-level techniques have concentrated on non-communication components of the mobile host, such as displays, disks and CPUs.

· A mobile phone can only guess about when other hosts may have data destined for it. If the suspension of the mobile host’s communication does not match pervading communication patterns, the isolation can cause batteries to overflow both in the mobile host and in other hosts trying to communicate with it.

Communication Model And Power Management

The introduction of wireless finks into communication systems based on wired finks has posed a number of problems. These problems include different loss characteristics and bandwidth capabilities on the wired and the wireless Erie, synchronization of disconnected operations, and issues involving packet forwarding. The obvious technique of data compression reduces the amount of transmission time, but requires additional CPU cycles for performing compression.

Communication-Based Power Management

Currently, a typical mobile host leaves its wireless Ethernet card in receive mode during the time it is not being used, less the user explicitly removes the card. The technique described in this section provides mechanisms to extend battery lifetime by suspending the wireless Ethernet card during idle periods in communication.

In order to determine the impact of our power management techniques, we measure the power consumption of a wireless Ethernet card under varying conditions.