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UBC Theses and Dissertations

A demand assigned multiple access strategy for land mobile satellite voice services Powell, Chris J.


Development of land mobile satellite systems is progressing rapidly, and implementation of new voice and data services for North America is scheduled for early 1994. In order to make the best use of the bandwidth allocated for these services, efficient demand assigned multiple access (DAMA) protocols must be employed. Efficiency achieved in terms of higher channel utilization and availability translates into more revenue for network management and better service for network subscribers. In particular, mobile voice services are examined, and a new blocked-calls-queued discipline, which processes calls in batches, designed specifically for dispatch radio via satellite is analyzed. Computer simulation is used to examine several batch service disciplines, and it is thereby shown that the new system meets the objectives of efficiency in providing a high level of performance by exploiting traffic characteristics unique to dispatch radio rather than adapting conventional techniques used in telephony. In addition, a technique for integrating mobile radio service and mobile telephone service in a dynamic resource sharing strategy using a common DAMA channel pool is introduced. The new strategy attempts to reserve a small margin of free channels for blocked-calls-dropped telephone traffic, while permitting the remaining channels to be shared between radio and telephone on a first come first served basis. It is shown that, without degrading the performance of either traffic source, the proposed integrated system achieves higher throughput than any other system of traffic integration found in the literature which is applicable to these services.

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