This paper presents an integrated modeling method providing superior Quality of Service (QoS) for wireless sensor networks\n(WSNs)which is suitable for smart distribution grid (SDG) communication. Traditional QoS model based on IEEE802.15.4 protocol\ncannot meet the communication requirements of multi priority data in smart distribution grid. In order to meet the specification\nof power system communication, a new QoS-enabled medium access control (MAC) model based on unfair competition channel\naccess mechanism (UCCAM) is developed in this paper. The proposed model can ensure that the communication system of WSN\nprovides different Qualities of Service for different priority data. According to different requirements for the communication time,\nthe data of SDG are divided into three types: high priority, middle priority, and low priority data. The state transition of buffering\nqueue data in node is described by a three-dimensional Markov chain model. Delay time, effective throughput rate, and channel\ncollision rate models are developed, respectively, to evaluate communication performance of WSN applied in smart distribution\ngrid.The simulation results show that the proposed model can provide different Qualities of Service for different priority data and\nis more efficient than the IEEE802.15.4e standard and the traditional methods.
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