EP0616481A2
Expired / Lapsed
EP
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Method of allocating radio channels for mobile communication system
Assignee: NEC Corp
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Filing: 1994-03-16
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Granted: —
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Expires: 2014-03-16
Abstract
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.
Inventors
- 👤 Kojiro C/O Nec Corporation Hamabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:21
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/02; H04W16/06; H04W16/12; H04W16/24; H04W28/00; H04W28/16; H04W72/00; H04W72/50; H04W72/54; H04W72/541; H04W76/00; H04W76/10; H04W88/00; H04W88/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A method of allocating radio channels in a mobile communication system comprising the steps of: providing in each of the base stations a plurality of sectoral zones each having a direction defined by a directional antenna; dividing all of the radio channels into as many channel groups as the number of sectoral zones per base station; assigning the same channel group as the preferential allocation channel group to each sectoral zone whose direction is 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, selecting radio channels 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 can be allocated to those sectoral zones having substantially the same direction in many of the base stations.
Claim 2
Independent Claim
193 words
A method of allocating radio channels in a mobile communication system comprising the steps of: providing in each of the base stations a plurality of sectoral zones each having a direction defined by a directional antenna; dividing all of the radio channels into as many channel groups as the number of sectoral zones per base station; assigning the same channel group as the preferential allocation channel group to each sectoral zone where, as for at least two of the base stations which are relatively close to each other, angles formed between the directions of sectoral zones and the directions toward a given region from each base station 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, selecting radio channels 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 can be allocated to those sectoral zones where said angles are substantially similar to each other.
Claim 3
Dependent Claim
34 words
A method according to claim 1, wherein if there is no allocable channel in the preferential allocation channel group, radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones.
Claim 4
Dependent Claim
34 words
A method according to claim 2, wherein if there is no allocable channel in the preferential allocation channel group, radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones.
Claim 5
Dependent Claim
54 words
A method according to claim 1, wherein some of the radio channels are assigned overlappingly to different preferential allocation channel groups, and when radio channels are selected from one preferential allocation channel group, they are selected in order from the channels which are assigned to the smallest number of the preferential allocation channel groups.
Claim 6
Dependent Claim
54 words
A method according to claim 2, wherein some of the radio channels are assigned overlappingly to different preferential allocation channel groups, and when radio channels are selected from one preferential allocation channel group, they are selected in order from the channels which are assigned to the smallest number of the preferential allocation channel groups.
Claim 7
Dependent Claim
42 words
A method according to claim 3, wherein when radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones, the radio channels are selected in the same order in those sectoral zones whose directions are substantially the same.
Claim 8
Dependent Claim
43 words
A method according to claim 4, wherein when radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones, the radio channels are selected in the same order in those sectoral zones where said angles are substantially the same.
Claim 9
Dependent Claim
46 words
A method according to claim 3, wherein when radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones, the radio channels are selected in order from the preferential allocation channel groups assigned to sectoral zones having the least difference in direction.
Claim 10
Dependent Claim
46 words
A method according to claim 4, wherein when radio channels are selected from the preferential allocation channel groups assigned to different sectoral zones, the radio channels are selected in order from the preferential allocation channel groups assigned to sectoral zones having the least difference in direction.
References Cited (Backward Citations)
No citation records indexed.
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