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Smart Phone Ad hoc Networks (SPANs) leverage the existing hardware (primarily Bluetooth and Wi-Fi) in commercially available smart phones to create peer-to-peer networks without relying on cellular carrier networks, wireless access points, or traditional network infrastructure. SPANs differ from traditional hub and spoke networks, such as Wi-Fi Direct, in that they support multi-hop relays and there is no notion of a group leader so peers can join and leave at will without destroying the network. == Features == * Capable of going off-grid and enabling peer-to-peer communications without relying on cellular carrier networks, wireless access points, or traditional network infrastructure. * Optional Internet access through gateway devices, such as mobile hotspots in the mesh. * Optional stationary or portable infrastructure such as routers, mesh extenders, or other non-phone hardware. * Leverage the devices that people carry on their person and use everyday. * Primarily use Bluetooth and Wi-Fi since the cellular spectrum is licensed and controlled by cellular providers and FCC regulations. * Set up and tear down are on-demand. Join and leave at will. * Routing protocol may be implemented at the Network Layer or Link Layer. * Often requires rooting a device and making modifications to the operating system, kernel, or drivers. * May result in profit loss by cellular carriers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Smart phone ad hoc network」の詳細全文を読む スポンサード リンク
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