A Spectrally efficient PMR system utilizing broadcast service
Author
Sengül, E.
Köymen, Hayrettin
İder, Y. Z.
Date
2005Source Title
IEEE Transactions on Broadcasting
Print ISSN
0018-9316
Publisher
Institute of Electrical and Electronics Engineers
Volume
51
Issue
4
Pages
493 - 503
Language
English
Type
ArticleItem Usage Stats
119
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105
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Abstract
Different trunked Private Mobile Radio (PMR) systems
have been designed over the last several decades, all of which
have symmetric downlink and uplink channel capacities. Due to
this symmetry, these systems may not be spectrally efficient in case
of different types of services, which are specific to PMR systems,
such as group and broadcast calls. In this study, a new asymmetric
trunked PMR system comprising a broadband, wide-area downlink
and a narrowband cellular uplink, is proposed to achieve a
higher spectral efficiency than current digital trunked PMR systems.
This system is spectrally more efficient because in group and
broadcast calls only a single downlink channel has to be allocated
in the downlink part. However, as the number of clusters in the
system increases, this advantage relative to PMR systems is lost,
since the latter can employ frequency reuse. Spectral efficiency of
the proposed asymmetric system (a-PMR) system and a standard
TETRA system are compared using numerical case studies against
different traffic loads and number of clusters. The optimum point,
with respect to number of clusters, up to which the proposed
a-PMR system is more efficient, is determined. It is shown that a
very large PMR user population can be efficiently served using
the proposed a-PMR system. The issues related to implementing
such a system are discussed.
Keywords
Digital audio broadcastingLand mobile radio cellular systems
Private mobile radio
Spectrum efficiency
Terrestrial trunked radio