Before revision:  The input buffer of each access node is modeled as a Geo/G/1 queue, and the service time distribution of each individual head-of-line packet is derived from the Markov chain of  underlying scheduling algorithm , from which we obtain stable regions of the retransmission factor that ensures the throughput stability of the system and bounded mean delay of input packets .
After revision:  The input buffer of each access node is modeled as a Geo/G/1 queue, and the service time distribution of each individual head-of-line packet is derived from the Markov chain of the underlying scheduling algorithm , from which we obtain stable regions of the retransmission factor that ensures the throughput stability of the system and bounded mean delay of input packets .