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This paper presents and analyzes a novel multiuser network based on hybridfree-space optical (FSO)/radio-frequency (RF) transmission system, where everyuser is serviced by a primary FSO link. When more than one FSO link fail, thecentral node services these corresponding users by using a common backup RFlink according to a non-equal priority with $p$ persistence servicing protocol.A novel discrete-time Markov chain model is developed for the proposed network,where different transmission rates over both RF and FSO links are assumed. Weinvestigate the throughput from central node to the user, the average size ofthe transmit buffer allocated for every user, the frame queuing delay in thetransmit buffer, the efficiency of the queuing system, the frame lossprobability, and the RF link utilization. The network's users are arranged inan ascending order. As the order of the failed user increases, thecorresponding performance criteria gets worse due to the non-equal priorityservicing protocol. Numerical examples show that transmitting a data frame withprobability $p$ when using the common backup RF link, achieves considerableperformance improvement that approaches the performance of the multiuser FSO/RFnetwork when using equal priority protocol to serve all the remote users.

Performance Analysis of Multiuser FSO/RF Network Under Non-Equal Priority with $P$-Persistence Protocol