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Sensors 2018, 18(5), 1537; https://doi.org/10.3390/s18051537

A Hybrid TDMA/CSMA-Based Wireless Sensor and Data Transmission Network for ORS Intra-Microsatellite Applications

1,2,3,* , 1,3
and
1,2,3
1
Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Shanghai Engineering Center for Microsatellites, Chinese Academy of Sciences, Shanghai 201210, China
*
Author to whom correspondence should be addressed.
Received: 1 April 2018 / Revised: 5 May 2018 / Accepted: 7 May 2018 / Published: 12 May 2018
(This article belongs to the Section Sensor Networks)
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Abstract

To achieve launch-on-demand for Operationally Responsive Space (ORS) missions, in this article, an intra-satellite wireless network (ISWN) is presented. It provides a wireless and modularized scheme for intra-spacecraft sensing and data buses. By removing the wired data bus, the commercial off-the-shelf (COTS) based wireless modular architecture will reduce both the volume and weight of the satellite platform, thus achieving rapid design and cost savings in development and launching. Based on the on-orbit data demand analysis, a hybrid time division multiple access/carrier sense multiple access (TDMA/CSMA) protocol is proposed. It includes an improved clear channel assessment (CCA) mechanism and a traffic adaptive slot allocation method. To analyze the access process, a Markov model is constructed. Then a detailed calculation is given in which the unsaturated cases are considered. Through simulations, the proposed protocol is proved to commendably satisfy the demands and performs better than existing schemes. It helps to build a full-wireless satellite instead of the current wired ones, and will contribute to provide dynamic space capabilities for ORS missions. View Full-Text
Keywords: ORS; wireless; modular; satellite; COTS; TDMA/CSMA; CCA; adaptive slot allocation; Markov model ORS; wireless; modular; satellite; COTS; TDMA/CSMA; CCA; adaptive slot allocation; Markov model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, L.; Liu, Y.; Yin, Z. A Hybrid TDMA/CSMA-Based Wireless Sensor and Data Transmission Network for ORS Intra-Microsatellite Applications. Sensors 2018, 18, 1537.

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