Difference between revisions of "Packet radio"
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| − | + | '''Packet radio''' is the name for [[datagram]] [[data network]] technology which sends data through the air using [[electro-magnetic radiation]] (i.e. radio). Packet radio technologies such as [[Wi-Fi]] and [[cellular telephone]] are now almost ubiquitous as the 'last hop' in most things' connection to the [[Internet]], both to allow mobility, and to avoid the hassle of having to run a physical [[conductor]] to the unit. | |
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| + | As such, most packet radio technologies are technically [[local area network|LANs]]. Since most packet radio networks have more than one station trying to transmit on a given radio [[frequency]], an [[access control]] mechanism must be provided; at first, [[Carrier-Sense Multiple Access with Collision Detection|CSMA-CD]] was invented for this. | ||
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| + | ==History== | ||
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| + | The first packet radio system built was the [[ALOHA System]], built in Hawaii to connect together University of Hawaii campuses on different islands; because of the distances involved, this was technically a [[wide area network]]. | ||
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| + | The success of the ALOHA network inspired [[Defense Advanced Research Projects Agency|DARPA]] to start a fairly considerable packet radio project, the [[Packet Radio Network]], in 1973, to explore the possibility of an ad-hoc data network using wireless links. | ||
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| + | ==Further reading== | ||
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| + | * Robert E. Kahn, Steven A. Gronemeyer, Jerry Burchfiel, Ronald C. Kunzelman, ''Advances in Packet Radio Technology'', Proceedings of the IEEE (Volume: 66, Issue: 11, Nov. 1978), pp. 1468-1496 (online precis available [https://people.eecs.berkeley.edu/~fox/summaries/wireless/advances_pr.html here]) | ||
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| + | <!-- ==External links== --> | ||
| + | [[Category: Networking Basics]] | ||
Revision as of 17:15, 8 October 2025
Packet radio is the name for datagram data network technology which sends data through the air using electro-magnetic radiation (i.e. radio). Packet radio technologies such as Wi-Fi and cellular telephone are now almost ubiquitous as the 'last hop' in most things' connection to the Internet, both to allow mobility, and to avoid the hassle of having to run a physical conductor to the unit.
As such, most packet radio technologies are technically LANs. Since most packet radio networks have more than one station trying to transmit on a given radio frequency, an access control mechanism must be provided; at first, CSMA-CD was invented for this.
History
The first packet radio system built was the ALOHA System, built in Hawaii to connect together University of Hawaii campuses on different islands; because of the distances involved, this was technically a wide area network.
The success of the ALOHA network inspired DARPA to start a fairly considerable packet radio project, the Packet Radio Network, in 1973, to explore the possibility of an ad-hoc data network using wireless links.
Further reading
- Robert E. Kahn, Steven A. Gronemeyer, Jerry Burchfiel, Ronald C. Kunzelman, Advances in Packet Radio Technology, Proceedings of the IEEE (Volume: 66, Issue: 11, Nov. 1978), pp. 1468-1496 (online precis available here)
