Mobile radio group communications by satellite

TitleMobile radio group communications by satellite
Publication TypeJournal Article
Year of Publication1993
AuthorsLeung, V. C. M.
JournalVehicular Technology, IEEE Transactions on
Pagination121 -130
Date Publishedmay.
Keywordscarrier sensing, closed user group, collision detection, DAMA protocol, demand assigned multiple access, demand assignment multiple access, mobile radio group communications, mobile radio systems, mobile satellite systems, satellite relay systems, signal capture, signaling protocol, telecommunication signalling

Mobile radio group communications enable a closed group of users to communicate among themselves using push-to-talk (PTT), half duplex transmissions, such that one's transmission is received by all. New protocol designs are presented which support group communications over mobile satellite systems. A new demand assignment multiple access (DAMA) protocol is necessitated by the inappropriateness of call-based channel assignments. Channels are assigned to individual user-groups engaged in active conversations. As members of a user-group contend for access to the assigned channel, access control by the usual manual methods is ineffective due to the very long round trip delay. A novel signaling protocol which automates access control is proposed. Carrier sensing, signal capture, and collision detection are employed to minimize access contentions. The throughput and holding time of the assigned channel are analyzed. Numerical results show that the access control protocol improves the capacity of the assigned channel by up to 65%


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