This book constitutes the refereed proceedings of the 7th International Conference on Wired/Wireless Internet Communications, WWIC 2009, held in Enschede, The Netherlands in May 2008. The 13 revised full papers were carefully reviewed and selected from 39 submissions. The papers are organized in topical sections on energy efficient WSN design, routing & transport protocols for WSNs, security and protocol design and mobility & handover management.