"ALOHA" redirects here. For the Hawaiian word, see Aloha. For other uses, see Aloha (disambiguation).
ALOHAnet, also known as the ALOHA System,[1][2][3] or simply ALOHA, was a pioneering computer networking system developed at the University of Hawaii.
The ALOHAnet used a new method of medium access, called ALOHA random access, and experimental ultra high frequency (UHF) for its operation. In its simplest form, later known as Pure ALOHA, remote units communicated with a base station (Menehune) over two separate radio frequencies (for inbound and outbound respectively). Nodes did not wait for the channel to be clear before sending, but instead waited for acknowledgement of successful receipt of a message, and re-sent it if this was not received. Nodes would also stop and re-transmit data if they detected any other messages while transmitting. While simple to implement, this results in an efficiency of only 18.4%. A later advancement, Slotted ALOHA, improved the efficiency of the protocol by reducing the chance of collision, improving throughput to 36.8%.
ALOHAnet became operational in June 1971, providing the first public demonstration of a wireless packet data network.[4][5]
ALOHA was subsequently employed in the Ethernet cable based network in the 1970s, and following regulatory developments in the early 1980s it became possible to use the ALOHA random-access techniques in both Wi-Fi and in mobile telephone networks. ALOHA channels were used in a limited way in the 1980s in 1G mobile phones for signaling and control purposes. In the late 1980s, the European standardization group GSM who worked on the Pan-European Digital mobile communication system GSM greatly expanded the use of ALOHA channels for access to radio channels in mobile telephony. In the early 2000s additional ALOHA channels were added to 2.5G and 3G mobile phones with the widespread introduction of General Packet Radio Service (GPRS), using a slotted-ALOHA random-access channel combined with a version of the Reservation ALOHA scheme first analyzed by a group at BBN Technologies.
^Abramson, N. (1970). The ALOHA System - Another Alternative for Computer Communications(PDF). Proc. 1970 Fall Joint Computer Conference. AFIPS Press.
^Kuo, F. F. (1995-01-11). "The ALOHA System". ACM SIGCOMM Computer Communication Review. 25 (1): 41–44. doi:10.1145/205447.205451. ISSN 0146-4833. S2CID 2355657.
^Kuo, Franklin F. (1981). "Computer Networks–The ALOHA System" (PDF). Journal of Research of the National Bureau of Standards. 86 (6). Report of the Office of Naval Research: 591–595. doi:10.6028/jres.086.027. PMC 6753009. PMID 34566062. Archived (PDF) from the original on February 28, 2017.
^Binder, R.; Abramson, N.; Kuo, F. F.; Okinaka, A.; Wax, D. (1975). ALOHA packet broadcasting - A retrospect(PDF). Proc. 1975 National Computer Conference. AFIPS Press.
^Abramson, N. (December 2009). "The Alohanet - surfing for wireless data [History of Communications]" (PDF). IEEE Communications Magazine. 47 (12): 21–25. doi:10.1109/MCOM.2009.5350363. S2CID 7757418. Archived (PDF) from the original on 2011-07-18.
ALOHAnet, also known as the ALOHA System, or simply ALOHA, was a pioneering computer networking system developed at the University of Hawaii. The ALOHAnet...
University of Hawaii. He identified and fixed some of the bugs in the AlohaNet model, then added that work to his revised thesis. It was then accepted...
American engineer and computer scientist, most known for developing the ALOHAnet system for wireless computer communication. Abramson was born on April...
same year. After reading an article on ALOHAnet, Robert Metcalfe became interested in computer networking. ALOHAnet was an over-the-air wide area network...
sequence of encapsulation requirements, as is attributed to OSI protocols. ALOHAnet § ALOHA protocol ODI NDIS SANA-II – Standard Amiga Networking Architecture...
at Kahaluʻu Bay. Ulupo Heiau at Kailua, Oahu In the experimental 1970s' ALOHAnet developed at the University of Hawaii, the packet controllers were called...
developed the world's first wireless computer communication network, ALOHAnet. The system became operational in 1971 and included seven computers deployed...
Vol (volume) It employed some of the technology previously used in the ALOHAnet system, including metal–oxide–semiconductor (MOS) transceiver and modem...
The first professional wireless network was developed under the brand ALOHAnet in 1969 at the University of Hawaii and became operational in June 1971...
allow Alto computers to communicate with each other. It was inspired by ALOHAnet, which Robert Metcalfe had studied as part of his PhD dissertation and...
Franklin Kuo, co-founders of HICSS, used HICSS platform to launch the ALOHAnet, that was subsequently employed in the Ethernet cable based network in...
Other projects, often proprietary or tied to a single institution, are: ALOHAnet was first used in Hawaii in 1971 to connect the islands. Amateur radio...
of the shared cable 10BASE5 and 10BASE2 networks that had been based on ALOHAnet. The standard known as 1BASE5 was adopted as 802.3e in 1986 by members...
asleep while reading it. Instead, he became fascinated by an article on ALOHAnet, an earlier wide-area networking system. By June he had developed his own...
Name Contribution(s) A Norman Abramson ALOHAnet network communication Robert Campbell Aitken Testing and diagnosis of integrated circuits Luigi Amerio...
began using radio to send digital information as early as 1971, using ALOHAnet.[citation needed] Friedhelm Hillebrand conceptualised SMS in 1984 while...
Communications of the ACM. The Ethernet protocol had been inspired by the ALOHAnet protocol which had been developed by electrical engineering researchers...
University of Utah Graphics Department. In the same year, Taylor helped fund ALOHAnet, a system designed by professor Norman Abramson and others at the University...
using a distributed coordination function ALOHA and slotted ALOHA, used in ALOHAnet Reservation ALOHA (R-ALOHA) Mobile Slotted Aloha (MS-ALOHA) Code-division...
enough to tolerate occasional bus contention on the network. CAN bus, ALOHAnet, Ethernet, etc., all experience occasional bus contention in normal operation...
University of Hawaii led development of a packet radio network known as ALOHAnet and performed a number of experiments beginning in the 1970s to develop...
singulation protocol is the ALOHA protocol, originally used decades ago in ALOHAnet and very similar to CSMA/CD used by Ethernet. These protocols are mainly...
engineering), 2007 IEEE Alexander Graham Bell Medal winner, developed ALOHAnet Anant Agarwal (Ph.D. electrical engineering), president of EdX at MIT Ružena...
in both directions simultaneously) is unknown. Capacity of Aloha: The ALOHAnet used a very simple access scheme for which the capacity is still unknown...
Hawaii, where it continued in use through the 1970s. It became part of the ALOHAnet. Several BCC employees became the core of Xerox PARC's computer research...
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