Base station allocation method for mobile radio communication system
First Claim
1. A dynamic channel assignment method for improving the frequency utilization efficiency of a cellular mobile radio communication system including a plurality of cells, each cell including a base station, wherein the cells are divided into a plurality of overlapping hierarchical groups, comprising the steps of:
- assigning a predetermined channel selection order to the communication channels, such that an initial value of the selection order for any base station in a particular hierarchical group is different than the initial value for any base station in any other hierarchical group;
selecting a communication channel, from among all communication channels, in response to a request for communication to a base station, in accordance with the selection order and beginning with the initial value assigned to the base station; and
assigning the selected communication channel to the request for communication when the expectation/interface radio power ratio of the communication channel is equal to or higher than a predetermined value.
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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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Citations
12 Claims
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1. A dynamic channel assignment method for improving the frequency utilization efficiency of a cellular mobile radio communication system including a plurality of cells, each cell including a base station, wherein the cells are divided into a plurality of overlapping hierarchical groups, comprising the steps of:
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assigning a predetermined channel selection order to the communication channels, such that an initial value of the selection order for any base station in a particular hierarchical group is different than the initial value for any base station in any other hierarchical group; selecting a communication channel, from among all communication channels, in response to a request for communication to a base station, in accordance with the selection order and beginning with the initial value assigned to the base station; and assigning the selected communication channel to the request for communication when the expectation/interface radio power ratio of the communication channel is equal to or higher than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification