TY - JOUR
T1 - Random access control scheme with reservation channel for capacity expansion of QZSS safety confirmation system ∗∗∗
AU - Takahashi, Tomohide
AU - Suematsu, Noriharu
AU - Ohya, Kei
AU - Oguma, Hiroshi
AU - Kameda, Suguru
N1 - Funding Information:
∗∗∗This work was partially presented at WCNC 2016 ((c) IEEE 2016 [6]). A part of this work is supported by JSPS KAKENHI Grant Number JP16H04361 and JP16KK0139.
Publisher Copyright:
Copyright © 2019 The Institute of Electronics, Information and Communication Engineers
PY - 2019/1
Y1 - 2019/1
N2 - 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.
AB - 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.
KW - 1-bit flag
KW - Access control
KW - Flag method
KW - Frame slotted ALOHA
KW - Global Positioning System (GPS)
KW - Quasi-Zenith Satellite System (QZSS)
KW - Synchronized spread spectrum code division multiple access (synchronized SS-CDMA)
UR - http://www.scopus.com/inward/record.url?scp=85059990754&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85059990754&partnerID=8YFLogxK
U2 - 10.1587/transfun.E102.A.186
DO - 10.1587/transfun.E102.A.186
M3 - Article
AN - SCOPUS:85059990754
SP - 186
EP - 194
JO - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
JF - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
SN - 0916-8508
IS - 1
ER -