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'''Carrier-sense multiple access with collision avoidance''' ('''CSMA/CA''') in [[computer network]]ing, is a network [[multiple access method]] in which [[Carrier signal|carrier]] sensing is used, but [[Node (networking)|node]]s attempt to avoid collisions by beginning transmission only after the channel is sensed to be "idle".<ref name="federalstandard">{{cite web|url=http://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm |title=Federal Standard 1037C |publisher=Its.bldrdoc.gov |access-date=2012-09-09}}</ref><ref name="atis">{{cite web |url=http://www.atis.org/tg2k/ |title=American National Standard T1.523-2001, Telecom Glossary 2000 |publisher=Atis.org |access-date=2012-09-09 |url-status=dead |archive-url=https://web.archive.org/web/20080302071329/http://www.atis.org/tg2k/ |archive-date=2008-03-02 }}</ref> When they do transmit, nodes transmit their packet data in its entirety.
It is particularly important for wireless networks, where the
CSMA/CA is unreliable due to the [[hidden node problem]].<ref>{{cite web |url=http://www.eunice-forum.org/eunice99/027.pdf |title=Study of different CSMA/CA IEEE 802.11-based implementations, Universitat Politècnica de Catalunya |access-date=2012-09-09 |archive-url=https://web.archive.org/web/20120306051958/http://www.eunice-forum.org/eunice99/027.pdf# |archive-date=2012-03-06 |url-status=dead }}</ref><ref name="eunice">{{cite arXiv|title=Comparative study of hidden node problem and solution using different techniques and protocols, Journal of Computing |date=2010 |author1=Viral V. Kapadia |author2=Sudarshan N. Patel |author3=Rutvij H. Jhaveri |class=cs.NI |eprint=1003.4070 }}</ref>
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