Method of allocating radio channels for mobile communication system
First Claim
1. A method of allocating radio channels in a mobile communication system comprising base stations, each base station having a plurality of sectoral zones whose direction is defined by a directional antenna located at the base station, said method comprising the steps of:
- dividing all of the available radio channels for said system into a number of radio channel groups equal to the number of sectoral zones per base station;
assigning each of said radio channel groups to said sectoral zones so that one of said radio channel groups is assigned as a preferential allocation channel group to each of said sectoral zones whose directions are substantially the same; and
when a request for communication occurs between a base station and a mobile station positioned in a sectoral zone covered by said base station,testing a carrier-to-interference power ratio of a selected radio channel from the preferential allocation channel group assigned to said sectoral zone; and
allocating the selected radio channel which has a carrier-to-interference power ratio equal to or greater than a predetermined value;
whereby a number of identical radio channels are allocated to the sectoral zones having substantially the same direction in many of the base stations.
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Abstract
Each of a plurality of base stations in a mobile radio communication system has a plurality of sectoral zones each having a directional antenna of horizontal directivity pattern. Radio channels are divided into as many groups as the number of sectoral zones per base station. The channel groups are assigned to the sectoral zones as the preferential allocation channel groups in such a manner that the same channel groups are assigned to the sectoral zones which have substantially the same directions determined by antenna directivity. When a request for communication occurs within a sectoral zone, channels are selected from the channel group assigned to the sectoral zone. If the carrier-to-interference power ratio of a selected channel is equal to or greater than a predetermined value, the selected channel is allocated. The mobile radio communication system thus has improved channel utilization efficiency to accommodate more traffic.
54 Citations
10 Claims
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1. A method of allocating radio channels in a mobile communication system comprising base stations, each base station having a plurality of sectoral zones whose direction is defined by a directional antenna located at the base station, said method comprising the steps of:
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dividing all of the available radio channels for said system into a number of radio channel groups equal to the number of sectoral zones per base station; assigning each of said radio channel groups to said sectoral zones so that one of said radio channel groups is assigned as a preferential allocation channel group to each of said sectoral zones whose directions are substantially the same; and when a request for communication occurs between a base station and a mobile station positioned in a sectoral zone covered by said base station, testing a carrier-to-interference power ratio of a selected radio channel from the preferential allocation channel group assigned to said sectoral zone; and allocating the selected radio channel which has a carrier-to-interference power ratio equal to or greater than a predetermined value; whereby a number of identical radio channels are allocated to the sectoral zones having substantially the same direction in many of the base stations. - View Dependent Claims (2, 3, 4, 5)
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6. A method of allocating radio channels in a mobile communication system comprising base stations, each base station having a plurality of sectoral zones whose direction is defined by a directional antenna located at the base station, said method comprising the steps of:
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dividing all of the available radio channels for said system into a number of radio channel groups equal to the number of sectoral zones per base station; assigning each of said radio channel groups as a preferential allocation channel group to each sectoral zone in at least two neighboring base stations where angles formed between the directions of said sectoral zones and the directions toward a given region from said base stations are substantially similar; and when a request for communication occurs between a base station and a mobile station positioned in a sectoral zone covered by said base station, testing a carrier-to-interference power ratio of a selected radio channel from the preferential allocation channel group assigned to said sectoral zone; and allocating the selected radio channel which has a carrier-to-interference power ratio equal to or greater than a predetermined value; whereby a number of identical radio channels are allocated to the sectoral zones where said angles are substantially similar. - View Dependent Claims (7, 8, 9, 10)
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Specification