An analysis of multi-receiver, non-adaptive, slotted Aloha with capture for wireless communications in factories

An architecture for incorporating mobile data users into an existing MAP/TOP (Manufacturing Automation Protocol/Technical and Office Protocol) system is presented. The scheme attaches a small number of radio base stations to the TOP network through which the mobiles may access the system by executing a capture-based, multi-receiver extension of the traditional nonadaptive slotted Aloha protocol. A two-component capture model motivated by the factory channel is developed, and the multireceiver system´s throughput performance is analyzed under two transmission models: base location independent and spatially correlated. It is seen that there is significant throughput degradation when base coverage areas overlap, indicating that this overlap should be minimized during system design