Abstract Medium-access-control (MAC) protocol for wireless networks proposed are based on collision avoidance using handshake between sender and receiver. However, most of the research efforts have been in the direction of sender initiated protocols. Only few receiver initiated protocols are proposed by the researchers such as MACA, MACA-BI, etc. In this paper, we have modified the MAC-BI by dividing the channel into equal and static sized slots, calling it slotted MACA-BI. Further, an analytical model is proposed to determine the throughput and delay of the modified protocol. The results of throughput and delay for the model have been computed for different offered loads and compared with the results of slotted MACA protocol. The proposed model undoubtedly improved the throughput, but the model decreases the delay also.