Delay Analytic Model in Bidirectional Traffic for IEEE 802.11 Contention-Free Networks

PCF utilizes polling-based mechanism to coordinate devices in a wireless network in order to provide a more reliable service quality. In this paper, we create two models to evaluate the expected delay of packets in bidirectional traffic: one constructs a delay analytic model based on different scenarios; the other transforms the PCF system into a classic M/G/1 multi-vacations queuing model for delay analysis. These two models can be used for power management and access control of the base station, which is important for improving the efficiency and optimizing energy consumption of the base station.