Assume a small communication network, consisting of two user stations and a base station (BS). The users are recording and transmitting data collected by sensors and are transmitting the data frames using frequency band BW, (uplink). BS only collects data and acknowledges them. It uses a different band BWBs (downlink) for transmissions. The uplink and downlink channels are assumed perfect; no packets are lost due to bit errors. An Aloha protocol is used to access the medium by the BS and users. The users generate traffic following Poisson distribution, with frame generation rate lu. The time duration of data frames is TF whereas the duration of acknowledgements is TAck: Determine the probability that the frame generated by a user will be lost.

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