Protocol design for mobile radio group communications over satellite

TitleProtocol design for mobile radio group communications over satellite
Publication TypeJournal Article
Year of Publication1992
AuthorsLeung, V. C. M.
JournalSelected Areas in Communications, IEEE Journal on
Pagination1351 -1361
Date Publishedoct.
Keywordsaccess control protocol, DAMA, demand assigned multiple access, half-duplex point-to-multipoint group communications, half-duplex push-to-talk voice communications, mobile radio group communications, mobile radio systems, mobile satellite systems, protocol design, protocols, satellite relay systems, signaling protocol, throughput capacity

A protocol design for a mobile radio service supporting half-duplex push-to-talk voice communications over mobile satellite systems is presented. The service enables a closed group of mobile radio users to communicate among themselves, so that a transmission from any user is received by all. A key issue is the efficient utilization of satellite channels. Demand-assignment multiple access (DAMA) is employed to allocate channels only to those user groups in active sessions of conversations. Owing to the unique characteristics of the half-duplex point-to-multipoint group communications, a new DAMA protocol is proposed for this service. Within a channel assigned to a user group, access contentions exacerbated by very long round-trip delay can occur. A signaling protocol is devised to arbitrate access contentions so as to improve the utilization of the assigned channel. The proposed access control protocol offers 65% or 18% improvement in throughput capacity compared to manual carrier-sensed access without and with collision detection, respectively


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