Frequency plan for a cellular network
AssigneeNorthern Telecom Limited
InventorSaleh M. Faruque
Life of this patent
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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.
Claims18
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.
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:
- 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.
Dependencies are inferred from the claim text.