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Near-me area network
A near-me area network (NAN) is a logical communication network that focuses on communication among wireless devices in close proximity.
Unlike local area networks (LANs), in which the devices are in the same network segment and share the same broadcast domain, the devices in a NAN can belong to different proprietary network infrastructures (for example, different mobile carriers). So, even though two devices are geographically close, the communication path between them might, in fact, traverse a long distance, going from a LAN, through the Internet, and to another LAN.
NAN applications focus on two-way communications among people within a certain proximity to each other, but don't generally concern themselves with those people’s exact locations.
==Background==
The Internet employs many different types of communication networks. A local area network (LAN) covers a small geographic area, such as a school or company; a metropolitan area network (MAN) usually spans a larger area, such as a city or state, whereas a wide area network (WAN) provides communication in a broad geographic area covering national and international locations. Personal area networks (PANs) are wireless LANs with a very short range (up to a few meters), enabling computer devices (such as PDAs and printers) to communicate with other nearby devices and computers. Due to the increasing popularity of location-enabled (or GPS-enabled) mobile devices (e.g., iPhone and Android phones), a new type of communication network is emerging — the near-me area network (NAN).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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