IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on Wideband Systems
Random Access Control Scheme with Reservation Channel for Capacity Expansion of QZSS Safety Confirmation System
Suguru KAMEDAKei OHYATomohide TAKAHASHIHiroshi OGUMANoriharu SUEMATSU
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2019 Volume E102.A Issue 1 Pages 186-194

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Abstract

For capacity expansion of the Quasi-Zenith Satellite System (QZSS) safety confirmation system, frame slotted ALOHA with flag method has previously been proposed as an access control scheme. While it is always able to communicate in an optimum state, its maximum channel efficiency is only 36.8%. In this paper, we propose adding a reservation channel (R-Ch) to the frame slotted ALOHA with flag method to increase the upper limit of the channel efficiency. With an R-Ch, collision due to random channel selection is decreased by selecting channels in multiple steps, and the channel efficiency is improved up to 84.0%. The time required for accommodating 3 million mobile terminals, each sending one message, when using the flag method only and the flag method with an R-Ch are compared. It is shown that the accommodating time can be reduced to less than half by adding an R-Ch to the flag method.

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© 2019 The Institute of Electronics, Information and Communication Engineers
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