IEEE 802.11 RTS/CTS

IEEE 802.11 RTS/CTS

RTS/CTS (Request to Send / Clear to Send) is the mechanism used by the 802.11 wireless networking protocol to reduce frame collisions introduced by the hidden terminal problem. Originally the protocol fixed the exposed terminal problem as well, but modern RTS/CTS includes ACKs and does not solve the exposed terminal problem.

Protocol Description

A node wishing to send data initiates the process by sending a Request to Send frame (RTS). The destination node replies with a Clear To Send frame (CTS). Any other node receiving the RTS or CTS frame should refrain from sending data for a given time (solving the hidden node problem). The amount of time the node should wait before trying to get access to the medium is included in both the RTS and the CTS frame. This protocol was designed under the assumption that all nodes have the same transmission range.

RTS/CTS is an additional method to implement "virtual carrier sensing" in Carrier sense multiple access with collision avoidance (CSMA/CA). By default, 802.11 relies on "physical carrier sensing" only which is known to suffer from the hidden node problem.

RTS/CTS packet size threshold is 0-2347 octets. Typically, sending RTS frames is turned off by default (threshold >=2347). If the packet size the node wants to transmit is larger than the threshold, the RTS/CTS handshake gets triggered. If the packet size is equal to or less than threshold the data frame gets sent immediately.

External links

# [http://www.ece.rice.edu/~camp/MAC/maca.pdf "A New Channel Access Method for Packet Radio"]
# [http://www.wi-fiplanet.com/tutorials/article.php/1445641 "Improving WLAN Performance with RTS/CTS" on wi-fiplanet.com]
# [http://www.cs.ucla.edu/NRL/wireless/uploads/kxu_globecom02.pdf "How Effective is the IEEE 802.11 RTS/CTS Handshake in Ad Hoc Networks?"]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • IEEE 802.11 RTS/CTS — RTS/CTS (Request To Send / Clear To Send, Запрос на отправку/Готовность к отправке) механизм, использованный в беспроводных сетях IEEE 802.11 для исключения т. н. «столкновений» фреймов; способ решения проблем «скрытого узла» и «незащищенного… …   Википедия

  • RTS/CTS — Request to Send and Clear to Send (RTS/CTS ) are flow control signals, that may refer to: RS 232 RTS/CTS IEEE 802.11 RTS/CTS This disambiguation page lists articles associated with the same title. If an internal l …   Wikipedia

  • IEEE 802.11e — ist ein Industriestandard des Institute of Electrical and Electronics Engineers (IEEE) und eine Erweiterung des Wireless LAN Standards IEEE 802.11 zur Unterstützung des Quality of Service Konzepts. Die mit der Ausarbeitung des Standards… …   Deutsch Wikipedia

  • IEEE 802.11e-2005 — or 802.11e is an approved amendment to the IEEE 802.11 standard that defines a set of Quality of Service enhancements for wireless LAN applications through modifications to the Media Access Control (MAC) layer. The standard is considered of… …   Wikipedia

  • IEEE 802.11e — 802.11e это поправки к стандарту IEEE 802.11, которые определяют серию улучшений Quality of Service для приложений, работающих в WLAN сетях. Данные поправки изменяют Media Access Control (MAC) уровень стандарта IEEE 802.11. Стандарт заботится о… …   Википедия

  • IEEE 802.11b — IEEE 802.11 (auch: Wireless LAN (WLAN), WiFi) bezeichnet eine IEEE Norm für Kommunikation in Funknetzwerken. Herausgeber ist das Institute of Electrical and Electronics Engineers (IEEE). Die erste Version des Standards wurde 1997 verabschiedet.… …   Deutsch Wikipedia

  • IEEE 802.11g — IEEE 802.11 (auch: Wireless LAN (WLAN), WiFi) bezeichnet eine IEEE Norm für Kommunikation in Funknetzwerken. Herausgeber ist das Institute of Electrical and Electronics Engineers (IEEE). Die erste Version des Standards wurde 1997 verabschiedet.… …   Deutsch Wikipedia

  • IEEE 802.11n-2009 — is an amendment to the IEEE 802.11 2007 wireless networking standard to improve network throughput over the two previous standards 802.11a and 802.11g with a significant increase in the maximum net data rate from 54 Mbit/s to 600 Mbit/s (slightly …   Wikipedia

  • IEEE 802.11n — is a proposed amendment to the IEEE 802.11 2007 wireless networking standard to significantly improve network throughput over previous standards, such as 802.11b and 802.11g, with a significant increase in the maximum raw (PHY) data rate from 54… …   Wikipedia

  • IEEE 802.11 — (auch: Wireless LAN (WLAN), Wi Fi) bezeichnet eine IEEE Norm für Kommunikation in Funknetzwerken. Herausgeber ist das Institute of Electrical and Electronics Engineers (IEEE). Die erste Version des Standards wurde 1997 verabschiedet. Sie… …   Deutsch Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”