Since 2008, more than 50% of all people worldwide are living in urban areas. The urban population is expected to grow from 3.5 billion to 5 billion over the next 20 years. Population density, waste, poverty, mobility, and air quality are just some examples of challenges faced in urban areas today and even more in the future. A solution proposed today is known as smart city. The main idea is to use information and communication technology to provide a kind of 'real-time data layer' for cities. This will increase the transparency and efficiency for all stakeholders (e.g., citizens, industry, commerce, and government). In order to attempt to provide such a real-time data layer, wireless sensor networks are identified as the key technology. They are supposed to offer a cheap and easy solution for large-scale deployments. In addition, wireless communication reduces the need for further infrastructure. We identified three key challenges in applying urban sensor networks: (i) deployment, (ii) standards and generic solutions, and (iii) energy. This work focuses on new approaches tackling the energy challenge and how real-world systems can be built. Seit dem Jahr 2008 leben erstmals mehr als 50% der Menschen im urbanen Raum. Das st ndige Wachstum der St dte, besonders in Asien, S d- und Mittelamerika, stellt die Stadtplanung vor immer neue Herausforderungen. Bev lkerungsdichte, Mobilit t, M llentsorgung und Luftverschmutzung sind nur einige Beispiele f r diese Herausforderungen. Davon betroffen sind Bewohner, Handel, Industrie und Verwaltung gleicherma en. Um diesen Herausforderungen in der Zukunft besser begegnen zu k nnen, wird heute der Begriff der intelligenten Stadt --- der Smart City --- gepr gt. Ein zentraler Punkt einer intelligenten Stadt ist die M glichkeit jederzeit Daten, m glichst in Echtzeit, ber den Zustand der Stadt zu sammeln und diese den Entscheidungstr gern bereitzustellen. Diese Daten werden dann genutzt, um zu jeder Zeit transparente, aber vor a
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