Abstract
With the development and universal application of satellite technology, an important way to expand the function of satellites is setting up inter-satellite networks to make them work together. Traditional satellite networking methods generally adopt a fixed time slot allocation method, which is not suitable for small satellite groups with low latency and high throughput requirements. In order to solve this problem, it has been proposed to apply the traditional Wifi protocol in satellite networking. As there are differences between satellite networks and terrestrial networks, it’s necessary to improve the traditional 802.11 protocol. The Media Access Control (MAC) protocol in 802.11 is improved in this paper, which mainly includes the adaptive algorithm of maximum contention window size and the growth algorithm of Contention Window (CW) size. The maximum contention window is adjusted according to the conflict state of the current network, which makes the network accommodate more satellite nodes. The CW growth algorithm improves the traditional Binary Exponential Back-off (BEB) algorithm, where the CW is designed according to the priority of the data frame or the network load. In this way, high-priority satellite accusation information will have higher reliability or tolerate greater network load.
Highlights
In recent years, space technology has developed rapidly
This paper mainly aims to reduce the delay, increase the probability of successful transmission of high-priority frames and increase the network load that the protocol can bear by improving the back-off collision avoidance algorithm
The algorithm we proposed modifies the size of CWmax in real-time: Feedback information about the media condition will be added to the Binary Exponential Back-off (BEB) algorithm to calculate the size of CWmax
Summary
As an important platform for space communication, satellites have increasingly higher requirements for performance, power consumption, volume and reliability [1]. In the field of satellites, the research of wireless networks has become a research hotspot with the development of aerospace technology and the growth of its business needs. Many countries have made full use of space resources to deploy a large number of spacecraft including low- orbiting and medium-orbiting satellites, small satellites, drones and the airships, to obtain spatial information in a timely manner [2]. With increasing number of spacecraft nodes, how to organize a network within them to achieve efficient message transmission has become the main research direction of current space networks [3, 4]
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