2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) 2013
DOI: 10.1109/pimrc.2013.6666713
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Large-capacity QZSS location and short message system using Frame Slotted ALOHA with Flag Method

Abstract: For large scale disaster relief, we propose a location and short message system using the Quasi-Zenith Satellite System (QZSS). The target capacity of the proposed system is the transmission of 3 million message data (MD) or more within one hour. To control random access of mobile terminal (MT), Frame Slotted ALOHA is used. Frame Slotted ALOHA cannot provide optimum control, since the hub station (HUB) does not know the number of MTs. For realizing large capacity, we propose Frame Slotted ALOHA with Flag Metho… Show more

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Cited by 13 publications
(5 citation statements)
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“…(1) because the HUB cannot know the number of MTs that request to send MD. We have previously proposed flag method to provide a control channel in order to estimate the number of MTs that desire to send the MD [2], [3]. Figure 3 shows a frame slotted ALOHA with flag method [17]- [19].…”
Section: Access Control Scheme Using Frame Slotted Alohamentioning
confidence: 99%
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“…(1) because the HUB cannot know the number of MTs that request to send MD. We have previously proposed flag method to provide a control channel in order to estimate the number of MTs that desire to send the MD [2], [3]. Figure 3 shows a frame slotted ALOHA with flag method [17]- [19].…”
Section: Access Control Scheme Using Frame Slotted Alohamentioning
confidence: 99%
“…The signal sMD i includes the multiple access group number i permitted to transmit MD and reception start time information of the satellite. By using highly accurate timing and positioning information obtained from QZSS and GPS, the stricter transmission timing of MD is controlled as in the following steps [2]- [10]. Firstly, the clock of MT is synchronized with highly accurate timing information obtained from the QZSS and GPS signal.…”
Section: )mentioning
confidence: 99%
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“…To realize this system, we have previously proposed the synchronized spread spectrum code division multiple access (synchronized SS-CDMA) [2,3,4,5]. The synchronized SS-CDMA uses long orthogonal spreading code (length of 10,000) to get high spreading gain and to accommodate many users.…”
Section: Introductionmentioning
confidence: 99%