Carrier-sense multiple access with collision avoidance (CSMA/CA) incomputer networking, is alink layermultiple access method in whichcarrier sensing is used. Under CSMA/CA,nodes attempt to avoid collisions by beginning transmission only after the channel is sensed to have no traffic.[1][2] When they do transmit, nodes transmit frames in their entirety.
This technique is primarily used in wireless networks, where the alternative with collision detectionCSMA/CD is not possible due to wireless transmitters that cannot effectively detect other transmissions while they themselves are transmitting.
CSMA/CA is unreliable due to thehidden node problem.[3][4]
Collision avoidance is used to improve the performance of theCSMA method by attempting to divide the channel somewhat equally among all transmitting nodes within the collision domain.
Although CSMA/CA has been used in a variety of wired communication systems, it is particularly beneficial in awireless LAN due to a common problem of multiple stations being able to see the Access Point, but not each other. This is due to differences in transmit power, and receive sensitivity, as well as distance, and location with respect to the AP.[5] This will cause a station to not be able tohear another station's broadcast. This is the so-called 'hidden node', or 'hidden station' problem. Devices utilizing802.11 based standards can enjoy the benefits of collision avoidance (RTS / CTS handshake, alsoPoint coordination function), although they do not do so by default. By default, they use a Carrier sensing mechanism calledexponential backoff (orDistributed coordination function), that relies upon a station attempting to 'listen' for another station's broadcast before sending. CA, or PCF relies upon the AP (or thereceiver for Ad hoc networks) granting a station the exclusive right to transmit for a given period of time after requesting it (Request to Send / Clear to Send).[6]
CSMA-CA requires a determination of whether a channel is 'idle', even when incompatible standards and overlapping transmission frequencies are used. Per the standards, for 802.11/Wi-Fi transmitters on the same channel, transmitters must take turns to transmit if they can detect each other even 3 dB above thenoise floor (the thermal noise floor is around -101 dBm for 20 MHz channels).[7] On the other hand, transmitters will ignore transmitters with incompatible standards or on overlapping channels if the received signal strength from them is below a threshold Pth which, for nonWi-Fi 6 systems, is between -76 and -80 dBm.[8]
CSMA/CA can optionally be supplemented by the exchange of aRequest to Send (RTS) packet sent by the sender S, and aClear to Send (CTS) packet sent by the intended receiver R. This alerts all nodes within range of the sender, receiver or both, to not transmit for the duration of the main transmission. This is known as theIEEE 802.11 RTS/CTS exchange. Implementation of RTS/CTS helps to partially solve thehidden node problem that is often found in wireless networking.[9][10]
CSMA/CA performance is based largely upon the modulation technique used to transmit the data between nodes. Studies show that under ideal propagation conditions (simulations),direct-sequence spread spectrum (DSSS) provides the highest throughput for all nodes on a network when used in conjunction with CSMA/CA and the IEEE 802.11 RTS/CTS exchange under light network load conditions.Frequency hopping spread spectrum (FHSS) follows distantly behind DSSS with regard to throughput, with a greater throughput once network load becomes substantially heavy. However, the throughput is generally the same under real-world conditions due to radio propagation factors.[4]