  One of the main problems in WIMAX is to share the medium by multiple users
who compete for access. Various random access mechanisms, such as ALOHA and its
corresponding variations have been widely studied as efficient methods to
coordinate the medium access among competing users. In this paper the slotted
ALOHA protocol is implemented as a two-state system. Using Markov Models, we
evaluate the channel utilization and we analyze the throughput under different
fairness conditions. The cooperative team problem is considered.
