Exploiting multiple wireless network interfaces

Sasu Tarkoma; Matti Siekkinen; Eemil Lagerspetz; Yu Xiao

doi:10.1017/CBO9781107326279.014

13 - Exploiting multiple wireless network interfaces

from Part III - Advanced energy optimization

Published online by Cambridge University Press: 05 August 2014

Eemil Lagerspetz and

Sasu Tarkoma: Affiliation:
University of Helsinki
Matti Siekkinen: Affiliation:
Aalto University, Finland
Eemil Lagerspetz: Affiliation:
University of Helsinki
Yu Xiao: Affiliation:
Aalto University, Finland

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Summary

In this chapter, we continue to look at the different ways to reduce the energy consumed by wireless communication. Our focus is on how to take advantage of the fact that modern smartphones include many different wireless technologies integrated under the hood and can even switch seamlessly between some of them.

How using multiple WNIs saves energy

Smartphones today contain many different radio technologies including Wi-Fi, Bluetooth, BLE, and cellular radios. As we learned in Section 7.3, using different WNIs can cause quite different amounts of energy to be consumed. More importantly, the energy utility of the different technologies vary substantially. For this reason, opportunities to save energy arise by using the WNIs wisely.

Recall from Section 7.3 that energy is consumed in non-connected and connected modes. The former essentially means discovering an AP or another device in order to establish communication, while the actual data transfer happens in the latter mode. The amount of energy spent in such a discovery process can account for a large part of the total amount of energy consumed. Fortunately, the differences in the energy consumption between the different kinds of radio can be used in that process. In addition, keeping multiple radios continuously powered on in the smartphone is usually unnecessary. In most cases, it is enough to have one radio active so that the phone remains reachable at all times to be able to receive phone calls or incoming messages pushed by mobile services.

Type: Chapter
Information: Smartphone Energy Consumption
Modeling and Optimization
, pp. 264 - 280

DOI: https://doi.org/10.1017/CBO9781107326279.014 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2014

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