Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-03-06
1998-06-23
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 62, 455 63, 455449, H04Q 736
Patent
active
057714541
ABSTRACT:
A channel assignment method wherein, when cover areas of base stations in a mobile radio communication system of the cellular system hierarchically overlap each other, communication channels are used commonly by the hierarchies to achieve effective utilization of frequencies by dynamic channel assignment. When a request for communication occurs, communication channels to which different selection orders between different hierarchies are applied are checked in terms of the channel quality based on the selection order, and a channel which exceeds a certain quality at first is assigned to the request for communication, but when a channel with which a required quality is obtained cannot be found in one of the hierarchies, selection of a channel is performed for another hierarchy by similar operations. When a request for communication arises, each base station performs selection from within the same hierarchy, and in this instance, a channel with which selection is to be begun is offset between the different hierarchies. Each base station controls the offset value based on a blocking occurrence value and/or a hand-over failure occurrence number of the base station so that it may be decreased in a hierarchy whose value or values mentioned are comparatively high.
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Eisenzopf Reinhard J.
Kincaid Lester G.
NEC Corporation
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