Abstract: Embedded system devices, especially portable mobile devices, arc powered from batteries which arc limited in size and weight, Therefore power becomes an important challenge to embedded system devices design. To investigate this problem, we used two strategies WIFI and GPRS to access the network and measure the changes of the system power consumption. hhe conclusions arc as follows: under both two strategics the battery life time decreases about 50 0 0 in the small flow mode (lOKb/min) and decreases more rapidly about 85 0 o in the big flow mode (2Mbit/min). Under the same condition, the devices consume less power in WIFI mode than GPRS mode. hhesc results were validated by two Android devices. The experiment results demonstrate that it is very important to find techniques to reduce the po- wer consumption of mobile network modules.

Key words: Low power technique, Android, Mobile Internet, System-level power consumption, Power estimation