Stability and Achieving Maximum Throughput Using Slotted Aloha and Csma with Multipacket Reception

The random access protocols with multi packet reception (MPR), which include both slotted-Aloha and slotted τ-persistent CSMA protocols. For both protocols, each node makes a transmission attempt in a slot with a given probability. The transmission channel is divided into equal slot using slotted-Aloha, then CSMA is used to check whether the channel is idle or not. CSMA is used to avoid collision that is occurred during transmission. Toward receive the optimal transmission probability maximizing a system throughput for both protocols and to develop a simple random access protocol with MPR, this achieves a system throughput close to the maximum value. Optimal transmission probability in the slotted-Aloha protocol is a good approximation for the τ-persistent CSMA protocol. A simple τ-persistent CSMA protocol with MPR is proposed which dynamically adjusts the transmission probability τ depending on the estimated number of active nodes, and thus can achieve a system throughput close to the maximum value.