Approximate queuing performance of a multipacket reception slotted ALOHA system with an exponential backoff algorithm

This paper considers queuing performance of a multipacket reception (MPR) slotted ALOHA channel with a finite population of terminals having infinite buffers. Each terminal retransmits its packet based on an exponential backoff algorithm upon a collision. By assuming that terminals´ interactions are statistically independent and identically distributed, we obtain an approximate lower bound of terminals´ queuing performance. However, numerical results of queuing performance show poor agreement between analysis and simulations. This is attributed to the positive correlation among the terminals´ interactions.