Rate Adaptation for 802.11 Wireless Networks: Minstrel
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چکیده
Minstrel is a practical rate selection algorithm for commodity 802.11 radios, implemented in the Linux kernel and the ns-3 network simulator. Design of a rate selection mechanism is complicated by the variety of sources of packet loss in 802.11 networks, the difficulty of testing rate adaptation, and interaction with higher layer protocols (especially TCP). Minstrel is based solely on acknowledgement feedback. Consequently, estimates of future success at a given rate are based only on past success ratios at that rate. Minstrel selects rates that will give an approximation to the best available throughput, while delivering packets with the highest probability achievable given link conditions and a constraint on the transmitter time to be spent on any one packet, so as to be friendly to higher layer protocols. If Minstrel fails to achieve communication with a neighbour, it collects good evidence that no communication is possible. Conversely, if communication is at all possible, Minstrel will find rates to use that will achieve the best reliability and close to the best performance avail-
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