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Smartphone ad hoc networks (SPANs; also smart phone ad hoc networks) are wireless ad hoc networks that use smartphones. Once embedded with ad hoc networking technology, a group of smartphones in close proximity can together create an ad hoc network. Smart phone ad hoc networks use the existing hardware (primarily Bluetooth and Wi-Fi) in commercially available smartphones to create peer-to-peer networks without relying on cellular carrier networks, wireless access points, or traditional network infrastructure. Wi-Fi SPANs use the mechanism behind Wi-Fi ad-hoc mode, which allows phones to talk directly among each other, through a transparent neighbor and route discovery mechanism. SPANs differ from traditional hub and spoke networks, such as Wi-Fi Direct, in that they support multi-hop routing (ad hoc routing) and relays and there is no notion of a group leader, so peers can join and leave at will without destroying the network.
SPANs are useful under circumstances when the regular network is overloaded or unavailable, such as conferences, music festivals, or natural disasters, and have been popular in Australia and Latin America. [1] They are popular with youth in the United States as a way to save money, as data sent directly from device to device is free. [2]
SPANs started being used in Iraq in 2014 to bypass government restrictions on Internet usage, [3] in the 2014 [4] and 2019–20 Hong Kong protests, [5] in 2015 in anti-government protests in Russia. [6] They have also been used by protestors in Taiwan, Iran, and Syria. [7]
The ad hoc networking technology operating on Wi-Fi ad hoc mode, at the unlicensed ISM band of 2.4 GHz may result in profit loss by cellular carriers since ISM band is free and unlicensed while cellular carriers operate on licensed band at 900 MHz, 1200 MHz, 1800 MHz, etc. This has the potential to threaten telecommunication operators (telcos). Smart phone mobile ad hoc networks can operate independently and allow communications among smart phones users without the need for any 3G or 4G LTE signals to be present. Wi-Fi ad hoc mode was first implemented on Lucent WaveLAN 802.11a/b on laptop computers. Since Wi-Fi is present and embedded in all smart phones today, this earlier technology was adapted for smartphones.
Smartphone ad hoc networks may be useful in situations that include:
In Apple Inc. iPhones released with iOS version 7.0 and higher, multipeer connectivity [9] APIs (application programmable interfaces) are enabled and provided to allow Apple iPhones to operate in peer-to-peer ad hoc mesh networking mode. This means iPhones can now talk to each other without using a cellular signal or connection. Currently, Apple uses multipeer to allow one to send photos and large files (up to GB) to peers. This application is called AirDrop and in 2017 had started gaining in popularity. With 700+ millions [10] of iPhones being used globally, ad hoc peer-to-peer networks will gain pervasive presence almost instantly. [11]
By merging the Linux Wireless Extension API with parts of the Android software stack, a modified version of Android can enable the ability to harness the ad hoc routing, communications and networking features of the onboard Wi-Fi chip. This empowers millions of Android phones with ad hoc mesh connectivity and networking capabilities. [12]
Software packages that implement smartphone ad hoc networks include GPL-licensed Serval Project over Bluetooth or WiFi; GPL-licensed Commotion Wireless; proprietary FireChat over Bluetooth, Bridgefy over Bluetooth, and GPL-licensed Briar over Bluetooth or WiFi.
A wireless LAN (WLAN) is a wireless computer network that links two or more devices using wireless communication to form a local area network (LAN) within a limited area such as a home, school, computer laboratory, campus, or office building. This gives users the ability to move around within the area and remain connected to the network. Through a gateway, a WLAN can also provide a connection to the wider Internet.
A wireless network is a computer network that uses wireless data connections between network nodes. Wireless networking allows homes, telecommunications networks and business installations to avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Admin telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.
Mobile computing is human–computer interaction in which a computer is expected to be transported during normal usage and allow for transmission of data, which can include voice and video transmissions. Mobile computing involves mobile communication, mobile hardware, and mobile software. Communication issues include ad hoc networks and infrastructure networks as well as communication properties, protocols, data formats, and concrete technologies. Hardware includes mobile devices or device components. Mobile software deals with the characteristics and requirements of mobile applications.
A wireless mesh network (WMN) is a communications network made up of radio nodes organized in a mesh topology. It can also be a form of wireless ad hoc network.
In IEEE 802.11 wireless local area networking standards, a service set is a group of wireless network devices which share a service set identifier (SSID)—typically the natural language label that users see as a network name. A service set forms a logical network of nodes operating with shared link-layer networking parameters; they form one logical network segment.
The Wi-Fi Alliance is a non-profit organization that owns the Wi-Fi trademark. Manufacturers may use the trademark to brand products certified for Wi-Fi interoperability. It is based in Austin, Texas.
Tethering or phone-as-modem (PAM) is the sharing of a mobile device's Internet connection with other connected computers. Connection of a mobile device with other devices can be done over wireless LAN (Wi-Fi), over Bluetooth or by physical connection using a cable, for example through USB.
Wi-Fi calling, also called VoWiFi, refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet, while seamlessly change connections between the two where necessary. This feature makes use of the Generic Access Network (GAN) protocol, also known as Unlicensed Mobile Access (UMA).
Mylo, standing for "My Life Online", is a pocket-sized handheld device created and marketed by Sony for instant messaging and other Internet-based communications like browsing Internet web sites using the Opera web browser, and playback and sharing of media files. Debuting in 2006, Mylo had a screen which slid up to reveal a QWERTY keyboard. Using Wi-Fi instead of cellular networks — reducing connectivity costs by avoiding the necessity of using GSM, CDMA or 3G cellular networks which would usually be used for devices of this size and functionality — the Mylo was targeted to the 18–24 age group. A revised model was released in 2008.
A wireless ad hoc network (WANET) or mobile ad hoc network (MANET) is a decentralized type of wireless network. The network is ad hoc because it does not rely on a pre-existing infrastructure, such as routers or wireless access points. Instead, each node participates in routing by forwarding data for other nodes. The determination of which nodes forward data is made dynamically on the basis of network connectivity and the routing algorithm in use.
Airplane mode is a setting available on smartphones and other portable devices. When activated, this mode suspends the device's radio-frequency (RF) signal transmission technologies, effectively disabling all analog voice, and digital data services, when implemented correctly by the electronic device software author.
Wi-Fi Direct is a Wi-Fi standard for wireless connections that allows two devices to establish a direct Wi-Fi connection without an intermediary wireless access point, router, or Internet connection. Wi-Fi Direct is single-hop communication, rather than multi-hop communication like wireless ad hoc networks. The Wi-Fi Direct standard was specified in 2009.
Samsung Kies is a freeware software application used to communicate between Windows or Macintosh operating systems, and Samsung mobile phone and tablet computer devices, usually using a USB connection. Samsung has released new software to replace Kies, named Samsung Smart Switch, which is mainly directed at migrating customers onto new Samsung devices. The name K.I.E.S. originated as an acronym for "Key Intuitive Easy System". After version 2.0, the name was shortened to "Kies".
The WIMM One is a developer device for the WIMM platform produced by WIMM Labs. It is a wearable computing device running a modified version of the Android operating system. It comes preloaded with several apps. Additional applications can be downloaded from the micro app store or side-loaded over USB.
Miracast is a wireless communications standard created by the Wi-Fi Alliance which is designed to transmit video and sound from devices to display receivers. It uses Wi-Fi Direct to create an ad hoc encrypted wireless connection and can roughly be described as "HDMI over Wi-Fi", replacing cables in favor of wireless. Miracast is utilised in many devices and is used or branded under various names by different manufacturers, including Smart View, SmartShare, screen mirroring, Cast and Connect, wireless display and screen casting.
The Serval Project is a project financed by the Shuttleworth Foundation, as well as various other organisations and accepting individual donations. It is headquartered at Flinders University in Adelaide, Australia. The project aims to develop technology that can be used to create direct connections between cellular phones through their Wi-Fi interfaces, without the need of a mobile phone operator. The technology allows for live voice calls whenever the mesh is able to find a route between the participants. Text messages and other data can be communicated using a store and forward system called Rhizome, allowing communication over unlimited distances and without a stable live mesh connection between all participants.
FireChat was a proprietary mobile app, developed by Open Garden, which used wireless mesh networking to enable smartphones to pass messages to each other peer-to-peer via Bluetooth, Wi-Fi, or Apple's Multipeer, without an internet connection.
Briar is an open-source software communication technology, intended to provide secure and resilient peer-to-peer communications with no centralized servers and minimal reliance on external infrastructure. Messages can be transmitted through Bluetooth, Wi-Fi, over the internet via Tor or removable storage, such as USB sticks. All communication is end-to-end encrypted. Relevant content is stored in encrypted form on participating devices. Long-term plans for the project include support for distributed applications such as crisis mapping and collaborative document editing.
The PinePhone is a smartphone developed by Hong Kong–based computer manufacturer Pine64, designed to provide users with full control over the device. This is achieved through the utilization of mainline Linux-based mobile operating systems, assembly of the phone using screws, and facilitating simplified disassembly for repairs and upgrades. The 2G-4GLTE modem, GPS, Wi-Fi, Bluetooth and both cameras can be physically switched off. The PinePhone ships with the Manjaro Linux operating system using the Plasma Mobile graphic interface, although other distributions can be installed by users.
Meshtastic is a decentralized wireless off-grid mesh networking LoRa protocol. The main goal of the project is enabling low-power, long-range communication over unlicensed radio bands. Its designed around exchanging text messages and data in off-grid environments, with potential applications in IoT projects where a decentralized communication system is needed without existing infrastructure.
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