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Over the last years mobile phones had a remarkable evolution. From a simple device for voice communication, it became a full blown multimedia device with multiple features and appealing services. In parallel with the introduction of novel services, mobile devices became more and more energy-hungry reducing the operational time for the user. To extend the battery life of mobile phones is one of the top priorities for mobile phones' manufacturers. This paper presents results of power and energy consumption measurements conducted on mobile phones for 2G and 3G networks. The services under investigation were text messaging, voice and data. The paper reports larger energy consumption in 3G networks for text messaging and voice services than energy consumption in 2G networks. On the other side the 3G networks become more energy friendly when large volumes of data have to be downloaded. The results imply that mobile phones should switch the network in dependency of the service used to save the maximum amount of energy. As this handover consumes energy, we include its analysis in our measurements.

Voice-over-IP (VoIP) has rapidly gained popularity in the last years, especially on smartphones platforms. In fact, WLAN chip-sets are becoming more common on smartphones, allowing users to use VoIP services from their mobile devices. On the other hand, the excessive energy consumption of the WLAN chip-set, limits the widespread use of VoIP on mobile phones. As most of the energy is spent when the WLAN is in idle mode waiting for a call, a possible solution is to use a secondary air interface, with lower energy consumption, as a signalling channel to wake up the WLAN radio. In this paper we describe two approaches to address this problem, namely the overlay and cooperative approaches. We present measurements of energy consumption done on a commercial device to show that the presented approaches can reduce the energy consumption for VoIP calls on smartphones over WLAN.

In this paper we investigate the energy consumption and achievable data rates of commercially available mobiles phones using WLAN IEEE802.11bg for mobile peer to peer networking. In contrast to numerous data rate measurements for WLAN, not much attention was paid for the energy consumption using WLAN on mobile phones. The knowledge of the actual energy consumption is useful for any future protocol design. Therefore we present a solid measurement campaign looking into the energy spent in sending, receiving, and idle mode for unicast and broadcast traffic. We introduce our measurement testbed as well as the tools that have been used or implemented throughout this work.

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