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IEEE 802.11 RTS/CTS (request to send/clear to send) is the optional mechanism used by the 802.11 wireless networking protocol to reduce frame collisions introduced by the hidden node problem. Originally the protocol fixed the exposed node problem as well, but later RTS/CTS does not, but includes ACKs.
Current versions of this UART by Exar claim to be able to handle up to 1.5 Mbit/s. This UART introduces the Auto-RTS and Auto-CTS features in which the RTS# signal is controlled by the UART to signal the external device to stop transmitting when the UART's buffer is full to or beyond a user-set trigger point and to stop transmitting to the ...
Devices utilizing 802.11 based standards can enjoy the benefits of collision avoidance (RTS / CTS handshake, also Point coordination function), although they do not do so by default. By default they use a Carrier sensing mechanism called exponential backoff (or Distributed coordination function ), that relies upon a station attempting to ...
Furthermore, it is the foundation of many other MAC protocols used in wireless sensor networks (WSN). [2] The IEEE 802.11 RTS/CTS mechanism is adopted from this protocol. [3] [4] It uses RTS-CTS-DS-DATA-ACK frame sequence for transferring data, sometimes preceded by an RTS-RRTS frame sequence, in view to provide solution to the hidden node ...
The comparison with hidden stations shows that RTS/CTS packages in each traffic class are profitable (even with short audio frames, which cause a high overhead on RTS/CTS frames). [ 2 ] In the experimental environment following traffic classes are included: data (not time critical), data (time critical), video, audio.
Hardware flow control, on the other hand, is typically under the direct control of the transmitting UART, which is able to cease transmission immediately, without the intervention of higher levels. To handle the latency caused by builtin FIFOs , more advanced UARTs, like the 16950, provide "on-chip" software flow control. [ 1 ]
RS-232 RTS/CTS, today's [as of?] usual RS-232 hardware flow control IEEE 802.11 RTS/CTS , wireless networking protocol flow control Topics referred to by the same term
[1] IEEE 802.11 RTS/CTS mechanism helps to solve this problem only if the nodes are synchronized and packet sizes and data rates are the same for both the transmitting nodes. When a node hears an RTS from a neighboring node, but not the corresponding CTS, that node can deduce that it is an exposed node and is permitted to transmit to other ...