Lifetime extension is one of the most critical research issues in the area of wireless sensor networks due to the severe resource limitations of the sensor nodes (e.g., small battery, limited computation capabilities, inexpensive transceiver etc.). One of the key approaches for prolonging the sensor network operable lifetime is to deploy an effective topology control protocol. This book proposes solutions pertinent the topology control issues and challenges in sensor networks, in particular the design of energy aware topology control algorithms.