Norman & Gupta, 2004) Argawal, Norman & Gupta (2004) identify three forces that drive the development of the wireless grid: New user interaction modalities and form factors Applications that exist on current wired grids need to be adapted to fit the devices used in wireless grids. These devices are usually hand held and therefore the user interface devices (screens, keyboards (if any)) are significantly smaller and availability of additional input devices like a mouse are limited. This means the traditional graphical interfaces found on PCs are not suitable. Limited computing resources Wireless devices do not possess the computing power nor the storage capacity of full size devices like a PC or laptop. Therefore, wireless applications need to have access to additional computing resources to be able to offer the same functionality that wired networks do. Additional new supporting infrastructure elements In the case of an unforeseen event, there will be the need for major amounts of computational and communications bandwidths. An urban catastrophe, for example, would require a dynamic and adaptive wireless network to alert people within the population as well as those in the various coordination and aid services like the police, army, medical services, and government. Applications to provide for these bandwidths and 'instant' networks need to be addressed. Wireless Grids infrastructure The infrastructure of the wireless grid consists of three basic levels: The physical layer technologies and policies. The physical layer contains the spectrum on which the wireless devices can operate and communicate. Network infrastructure Middleware to provide communications between heterogeneous devices See also Bluetooth IEEE 802.11 Mesh network Metcalfe's law Overlay network P2P SOAP Wi-Fi Wireless local loop X.509 External links FCC IETF Further reading Jürgen Falkner, Fraunhofer Institute for Industrial Engineering; JNF/842, 2004), The Fraunhofer Resource Grid - making Grids usable Lee W. McKnight, James Howison (2004). Wireless Grids; Distributed Resource Sharing by Mobile, Nomadic, and Fixed Devices. Agarwal, Norman and Gupta (2004). Wireless grids: approaches, architectures, and technical challenges. Lee McKnight and Howison (2003). Towards a sharing protocol for wireless grids Sridhar Iyer (2000). Routing in Mobile Ad Hoc Networks Hwang & Aravamudham. Proxy-based middleware services for peer-to-peer computing in virtually clustered wireless grid networks Wijngaert, v.d, Bouwman, Moerbeek and Kwiatkowska. Would you Share? Predicting the Potential Use of a New Technology using Multilevel Linear Regression Analysis Uzunner and Davis. Digital fingerprinting for distributed volume tracking: intellectual property protection in wireless grids Grid