Orthogonal frequency hopping pattern re-use scheme
First Claim
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1. A method for selecting a channel for use in connecting a remote station to a radiocommunication system comprising the steps of:
- assigning a set of orthogonal offsets to a cell;
generating a pseudo-random number;
pseudo-randomly selecting one of said orthogonal offsets using a value associated with said remote station; and
combining said pseudo-randomly selected orthogonal offset with said pseudo-random number to generate a channel selection number, wherein said channel selection number will vary pseudo-randomly between said remote station and another remote station operating in another cell having said same set of orthogonal offsets.
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Abstract
Frequency hopping techniques which provide greater interference averaging are described. Cells having the same hopping sequence select sequence offsets pseudo-randomly in a manner which ensures that stations within cells select different channel frequencies, but also that as between such cells, interferers change between hops. This can be accomplished by, for example, providing each station with a unique identifier that can be used in conjunction with a pseudo-random number to select from the set of hopping sequences assigned to the cell.
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Citations
11 Claims
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1. A method for selecting a channel for use in connecting a remote station to a radiocommunication system comprising the steps of:
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assigning a set of orthogonal offsets to a cell; generating a pseudo-random number; pseudo-randomly selecting one of said orthogonal offsets using a value associated with said remote station; and combining said pseudo-randomly selected orthogonal offset with said pseudo-random number to generate a channel selection number, wherein said channel selection number will vary pseudo-randomly between said remote station and another remote station operating in another cell having said same set of orthogonal offsets. - View Dependent Claims (2)
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3. A method for frequency hopping in a radiocommunication system comprising the steps of:
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assigning a same set of hopping sequences to a first and second cell; and selecting, as between said first and second cells, hopping sequences pseudo-randomly wherein a station in said first cell has a first interferer in said second cell during a first hop interval and a second interferer, different from said first interferer, in said second cell during a second hop interval. - View Dependent Claims (4)
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5. An apparatus comprising:
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means for assigning a set of orthogonal offsets to a cell; means for generating a pseudo-random number; means for pseudo-randomly selecting one of said orthogonal offsets using a value associated with said remote station; and means for combining said pseudo-randomly selected orthogonal offset with said pseudo-random number to generate a channel selection number, wherein said channel selection number will vary pseudo-randomly between said remote station and another remote station operating in another cell having said same set of orthogonal offsets. - View Dependent Claims (6)
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7. A frequency hopping radiocommunication system comprising:
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means for assigning a same set of hopping sequences to a first and second cell; and a sequence selection device for selecting, as between said first and second cells, hopping sequences pseudo-randomly wherein a station in said first cell has a first interferer in said second cell during a first hop interval and a second interferer, different from said first interferer, in said second cell during a second hop interval. - View Dependent Claims (8)
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9. A channel selection unit for use in a radiocommunication system comprising:
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a first pseudo-random number generator for generating a first random number; a second pseudo-random number generator for generating a second random number; a first adder for adding an offset to said second pseudo-random number; a second adder for adding an output of said first adder and said first pseudo-random number together; and means for addressing a hop sequence memory device using an output of said second adder to select channels. - View Dependent Claims (10, 11)
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Specification