Mobile radio group communications by satellite

TitleMobile radio group communications by satellite
Publication TypeConference Paper
Year of Publication1992
AuthorsLeung, V. C. M.
Conference NameVehicular Technology Conference, 1992, IEEE 42nd
Pagination874 -877 vol.2
Date Publishedmay.
Keywordsaccess contentions, access control signal protocol, channel allocation, channel utilization, communications capacity, DAMA protocol, demand assigned multiple access, demand assignment multiple access, group communications, half duplex communications, mobile radio service, mobile radio systems, mobile satellite systems, protocols, push to talk communications, satellite channels, satellite relay systems, telecommunication channels, telecommunication signalling, voice communication, voice communications
Abstract

The protocol design for a mobile radio service supporting half-duplex, push-to-talk, voice communications over mobile satellite systems currently being developed around the world is presented. The service enables a close group of mobile users to communicate among themselves, such that a transmission from any user is received by all. A key issue in the design is the efficient utilization of satellite channels. Demand assignment multiple access (DAMA) is used to allocate channels only to those user-groups in active sessions of conversations. The unique characteristics of the half-duplex, point-to-multipoint group communications necessitate the DAMA protocol proposed for this service. Within a channel assigned to a user-group, access contentions can occur among its members. The resulting loss of capacity due to collisions is exacerbated by the very long round trip delay. A novel access control signal protocol is proposed to detect an resolve across contentions, thus improving channel utilization. Analysis and numerical results are presented to illustrate the efficacy of this protocol

URLhttp://dx.doi.org/10.1109/VETEC.1992.245287
DOI10.1109/VETEC.1992.245287

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