Frequency plan for a cellular network
First Claim
1. In a sixty degree sector transmit sector receive cellular network with an N=3 frequency plan wherein available channel frequencies are divided into eighteen frequency groupings, a method of assigning frequencies comprising the steps of:
- forming a generally triangular first three-cell cluster;
dividing each cell of the first three-cell cluster into six sectors; and
for said each cell, assigning, in an order, one frequency grouping to each sector to provide a separation of three channel frequencies between each sector within said each cell and a separation of at least seven channel frequencies between adjacent cells.
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Accused Products
Abstract
An N=3 frequency plan for 60 degree sector transmit sector receive (STSR) cell sites is based upon dividing available channels into 18 frequency groups. Frequency assignment is in accordance with an odd-even cyclic distribution of channels which provides a three-channel separation between sectors within a cell and at least seven-channel separation between adjacent cells. This ensures adequate channel isolation between sectors and improved adjacent channel C/I performance throughout the network. The N=3 frequency plan increases channel capacity by approximately 38% in AMPS and 114% in TDMA-3.
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Citations
18 Claims
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1. In a sixty degree sector transmit sector receive cellular network with an N=3 frequency plan wherein available channel frequencies are divided into eighteen frequency groupings, a method of assigning frequencies comprising the steps of:
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forming a generally triangular first three-cell cluster; dividing each cell of the first three-cell cluster into six sectors; and for said each cell, assigning, in an order, one frequency grouping to each sector to provide a separation of three channel frequencies between each sector within said each cell and a separation of at least seven channel frequencies between adjacent cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A base station for sixty degree sector transmit sector receive cellular network with an N=3 frequency plan wherein available channel frequencies are divided into eighteen frequency groupings, the base station comprising:
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a first plurality of transmitters for a first subset of the available channel frequencies; a first combiner for combining output from the first plurality of transmitters; a first duplexer for providing the combined output to a first transmitting/receiving antenna for transmission; a second plurality of transmitters for a second subset of the available channel frequencies; a second combiner for combining output from the second plurality of transmitters; a second duplexer for providing the combined output from the second combiner to a second transmitting/receiving antenna for transmission; a first receive multi-coupler connected to the first duplexer for receiving a signal from the first antenna; a second receive multi-coupler connected to the second duplexer for receiving a signal from the second antenna; a first receiver having a primary splitter connected between the first receive multi-coupler and a primary receiver and a secondary splitter connected between the second multi-coupler and a secondary receiver; and a second receiver having a primary splitter connected to the second receive multi-coupler and a secondary splitter connected to the first receive multi-coupler. - View Dependent Claims (18)
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Specification