Structure of cells within a mobile communication system
First Claim
1. A mobile communication system having a plurality of radio cells for a service area so that each radio cell is assigned a respective channel, and a same channel is used in a plurality of radio cells which are apart from each other by more than a predetermined distance, said mobile communication system comprising:
- a first cell provided in one of said radio cells, said first cell accessed by a first antenna provided in a base station, said first antenna having a first vertical directivity;
a second cell provided in said one of said radio cells, said second cell is smaller than said first cell, said second cell being provided within said first cell and being concentric and overlapped by said first cell and said second cell is accessed by a second antenna which is provided in said base station, said second antenna having a second vertical directivity which is different from said first antenna, wherein a cell area, in which said same channel is used in said second cell, is smaller than a cell area that said same channel is used in said first cell, and wherein each cell having a respective channel; and
each cell including a control channel transceiver means for controlling each respective cell,wherein communication between a mobile station and said base station being effected through a channel having a higher signal received level in one of a communication channel and a control channel.
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Accused Products
Abstract
A re-use partition of cells in a mobile communication system has an outer cell (30) and an inner cell (20) which is provided in the outer cell (30). An interval of cells using the same channel or the same frequency in the inner cells is shorter than an interval in the outer cells, which is the nature of a re-use partition. Communication between a base station and a mobile station is carried out by using a channel having a higher received level of an outer cell channel or an inner cell channel. A base station has a first beam tilt antenna having tilt angle (Θout) for an outer cell (30), and a second beam tilt antenna having tilt angle (Θin) so that Θin is larger than Θout. A speech channel and a control channel are provided for each of the first antenna and the second antenna.
88 Citations
17 Claims
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1. A mobile communication system having a plurality of radio cells for a service area so that each radio cell is assigned a respective channel, and a same channel is used in a plurality of radio cells which are apart from each other by more than a predetermined distance, said mobile communication system comprising:
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a first cell provided in one of said radio cells, said first cell accessed by a first antenna provided in a base station, said first antenna having a first vertical directivity; a second cell provided in said one of said radio cells, said second cell is smaller than said first cell, said second cell being provided within said first cell and being concentric and overlapped by said first cell and said second cell is accessed by a second antenna which is provided in said base station, said second antenna having a second vertical directivity which is different from said first antenna, wherein a cell area, in which said same channel is used in said second cell, is smaller than a cell area that said same channel is used in said first cell, and wherein each cell having a respective channel; and each cell including a control channel transceiver means for controlling each respective cell, wherein communication between a mobile station and said base station being effected through a channel having a higher signal received level in one of a communication channel and a control channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification