Does a WSN MAC Based on Uniform Access without Re-attempts Have Merits?

We consider a simplified medium access control scheme, select-and-transmit (S&T), for wireless sensor networks, in which the sensor nodes choose transmission slots uniformly without re-attempts. Numerical results show that the S&T MAC can perform better than the IEEE 802.15.4 standard in event-driven sensor networks scenarios, where only a small proportion of packets need to be collected