25 Multiple Concurrent Senders AP-client – 20-47% better over CSMA. Mesh – 52% better over CSMA.
26 Hidden terminals – backoff ensures CMAP similar to CSMA. CMAP without windowed ACKs gets only half the gains → windowed ACKs useful. CMAP’s gains hold across multiple bit-rates. More results in the paper
27 Related Work RTS but no CTS → exposed. [Karn, Shukla et al.] Offline training to identify exposed terminals. [Mittal and Belding] u y z x RTS CTS X
28 Limitations Losses until conflict map entries populated. Unequal pkt sizes → longer to detect conflicts. Cannot detect conflicts when interfering node’s headers cannot be decoded.
29 Contributions MAC to improve throughput by increasing concurrency. Key idea: watch and discover conflicts. Experiments show increased throughput. 2x improvement over CSMA with exposed terminals. ~50% improvement in AP and mesh networks.