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Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)

CSMA/CA er en protokol for tilfældig adgang til styring af medieadgang i trådløse netværk, designet til at muliggøre, at flere enheder kan dele en trådløs kanal, mens kollisioner minimeres. Den blev introduceret af Phil Karn i 1990 og udgør grundlaget for WiFi (IEEE 802.11) og er nu de facto-standarden for adgang til ulicenseret spektrum. CSMA/CA kombinerer bærersignalregistrering (lyt før transmission) med kollisionsundgåelse (RTS/CTS-håndtryk) for at forbedre kanaleffektivitet og fairness og undgå effektivitetstab fra ren tilfældig adgang (Aloha).

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Kilder

  1. Karn, P. (1990). MACA—a new channel access method for packet radio. In Proceedings of the ARRL/CRRL Amateur Radio 9th Computer Networking Conference, 134-140. link
  2. IEEE 802.11 Working Group. (2020). IEEE Standard for Information Technology—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. IEEE. link

Sådan citerer du denne side

ScholarGate. (2026, June 3). Carrier Sense Multiple Access with Collision Avoidance. ScholarGate. https://scholargate.app/da/telecommunications/csma-ca

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Refereret af

ScholarGateCSMA/CA (Carrier Sense Multiple Access with Collision Avoidance). Hentet 2026-06-15 fra https://scholargate.app/da/telecommunications/csma-ca · Datasæt: https://doi.org/10.5281/zenodo.20539026