Smartphone ad hoc network

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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.

Contents

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]

Features

Threats to telcos

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.

Usage

Smartphone ad hoc networks may be useful in situations that include:

Real-life usage of smart phone ad hoc networks

Operating system

Apple Multipeer Connectivity

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]

Android phone ad hoc networks

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 implementations

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.

Device manufacturer support

See also

Related Research Articles

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References

  1. Bonnington, Christina. "This Little-Known iOS Feature Will Change the Way We Connect". Wired.
  2. 1 2 Olson, Parmy. "How Half A Million U.S. Teens Are Texting Without A Data Plan. 2015". Forbes .
  3. 1 2 Kuchler, Hannah; Kerr, Simon (22 June 2014). "'Private internet' FireChat app grows in popularity in Iraq". Financial Times .
  4. 1 2 Cohen, Noam (6 October 2014). "Hong Kong Protests Propel FireChat Phone-to-Phone App". New York Times .
  5. 1 2 Koetsier, John (2019-09-02). "Hong Kong Protestors Using Mesh Messaging App China Can't Block: Usage Up 3685%". Forbes . Archived from the original on 2019-09-02. Retrieved 2019-09-03.{{cite news}}: CS1 maint: bot: original URL status unknown (link)
  6. 1 2 Milian, Mark (30 December 2014). "Russians Are Organizing Against Putin Using FireChat Messaging App". Bloomberg . Retrieved 1 January 2015.
  7. Boiten, Eerke; Conversation, The. "FireChat's revolutionary use will not be revolutionary for long". phys.org.
  8. Hern, Alex (24 June 2014). "Firechat updates as 40,000 Iraqis download "mesh" chat app in censored Baghdad". The Guardian .
  9. "MultipeerConnectivity Apple Developer Documentation".
  10. Reisinger, Don. "Here's How Many iPhones Are Currently Being Used Worldwide, 2017". Fortune .
  11. Elgan, Mike (22 March 2014). "How an Underappreciated iOS 7 Feature Will Change the World".
  12. Patterson, Steven Max (12 February 2013). "Android phones are connecting without carrier networks, 2013". Network World .
  13. Bonnington, Christina. "This Little-Known iOS Feature Will Change the Way We Connect". Wired . Retrieved 1 January 2015.