TIIS (한국인터넷정보학회)
Current Result Document :
| 한글제목(Korean Title) |
Towards the Saturation Throughput Disparity of Flows in Directional CSMA/CA Networks: An Analytical Model |
| 영문제목(English Title) |
Towards the Saturation Throughput Disparity of Flows in Directional CSMA/CA Networks: An Analytical Model |
| 저자(Author) |
Jianrui Fan
Xinru Zhao
Wencan Wang
Shengsuo Cai
Lijuan Zhang
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| 원문수록처(Citation) |
VOL 15 NO. 4 PP. 1293 ~ 1316 (2021. 04) |
한글내용
(Korean Abstract) |
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영문내용
(English Abstract) |
Using directional antennas in wireless Ad hoc networks has many superiorities, including reducing interference, extending transmission range, and increasing space division multiplexing. However, directional transmission introduces two problems: deafness and directional hidden terminals problems. We observe that these problems result in saturation throughput disparity among the competing flows in directional CSMA/CA based Ad hoc networks and bring challenges for modeling the saturation throughput of the flows. In this article, we concentrate on how to model and analyze the saturation throughput disparity of different flows in directional CSMA/CA based Ad hoc networks. We first divide the collisions occurring in the transmission process into directional instantaneous collisions and directional persistent collisions. Then we propose a four-dimensional Markov chain to analyze the transmission state for a specific node. Our model has three different kinds of processes, namely back-off process, transmission process and freezing process. Each process contains a certain amount of continuous time slots which is defined as the basic time unit of the directional CSMA/CA protocols and the time length of each slot is fixed. We characterize the collision probabilities of the node by the one-step transition probability matrix in our Markov chain model. Accordingly, we can finally deduce the saturation throughput for each directional data stream and evaluate saturation throughput disparity for a given network topology. Finally, we verify the accuracy of our model by comparing the deviation of analytical results and simulation results.
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| 키워드(Keyword) |
Ad Hoc networks
Directional CSMA/CA Protocol
Saturation Throughput Disparity
Markov Chain Model
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| 파일첨부 |
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