Before revision: A Markovian model  is proposed in this paper to study the performance of 1-persistent CSMA / CA protocols, from which we obtain stable regions with respect to the throughput and bounded delay of Geometric Retransmission and Exponential Backoff scheduling algorithms .
After revision: A Markovian model is proposed in this paper . The input buffer of each access node is modeled as a Geo / CA protocols, from which we obtain stable regions with respect to the throughput and bounded delay of Geometric Retransmission and Exponential Backoff scheduling algorithms .