Multislotted ALOHA scheme for high-efficiency transmission of variable-length packets

The paper proposes the multislotted ALOHA (MS‐ALOHA) as a new random access scheme which can improve the throughput in variable‐length packet signal transmission. This scheme is to improve the throughput in the variable‐length packet signal transmission by controlling the transmission timing according to the packet‐signal length. The throughput performance of the proposed scheme for the variable‐length packet transmission is formulated for the infinite station model and the finite station model. The proposed scheme is compared to the traditional slotted ALOHA with the single transmission timing by computer simulation. It is shown that the throughput of the proposed scheme is larger independently of the signal length and the performance is stable against the variation of the signal‐length distribution. When the signal length is distributed uniformly, the maximum throughput is improved by approximately 20 percent compared to the traditional scheme. The application of the retransmission slot‐control scheme to the proposed scheme is considered. Here, the transmission slot for the retransmission packet is assigned to each transmitting station. As a result of analysis by computer simulation, it is shown that a higher throughput is obtained than the ALOHA scheme with the selective rejection retransmission protocol.