US5850608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional frequency assignment in a cellular radio system
Assignee: Nortel Networks Ltd
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Filing: 1996-11-08
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Granted: 1998-12-15
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Expires: 2016-11-08
Abstract
Abstract The process of the present invention is based on a hexagonal cellular platform where six, or a multiple of six, frequency groups are directionalized and reused in the same direction. Directional antennas are located in the center of each cell. Each antenna radiates into a 60° sector of the cell. The reused frequency groups are aligned along the 0°, 120°, and 240° axes of each cell. Each axis has three layers, the two outer layers having an identical frequency reuse series. The frequency groups are reused in the same direction along each axis, reducing the number of dominant interfering cells to one.
Inventors
- 👤 Saleh Faruque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:33
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/02; H04W16/12; H04W16/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
209 words
A method for frequency allocation in a cellular system, the cellular system having a plurality of available frequencies and comprising a plurality of cells, each cell comprising six sectors, the method comprising the steps of: forming a cluster of cells comprising a subset of the plurality of cells, the cluster of cells having a plurality of frequency reuse axes, each frequency reuse axis having a plurality of layers, each layer on a first frequency reuse axis of the plurality of frequency reuse axes being parallel to the other layers on the first frequency reuse axis; grouping the plurality of available frequencies into a plurality of frequency groups; assigning a first series of the frequency groups to the sectors on a first layer of the plurality of layers along the first frequency reuse axis of the plurality of frequency reuse axes, the first series being composed only of odd numbered frequency groups; and assigning a second series of the frequency groups, the second series being composed only of even numbered frequency groups, to the sectors on a second and third layer of the plurality of layers along the first frequency reuse axis of the plurality of frequency reuse axes, the second and third layers each being adjacent the first layer.
Claim 2
Independent Claim
209 words
A method for frequency allocation in a cellular system, the cellular system having a plurality of available frequencies and comprising a plurality of cells, each cell comprising six sectors, the method comprising the steps of: forming a cluster of cells comprising a subset of the plurality of cells, the cluster of cells having a plurality of frequency reuse axes, each frequency reuse axis having a plurality of layers, each layer on a first frequency reuse axis of the plurality of frequency reuse axes being parallel to the other layers on the first frequency reuse axis; grouping the plurality of available frequencies into a plurality of frequency groups; assigning a first series of the frequency groups to the sectors on a first layer of the plurality of layers along the first frequency reuse axis of the plurality of frequency reuse axes, the first series being composed only of odd numbered frequency groups; and assigning a second series of the frequency groups, the second series being composed only of even numbered frequency groups, to the sectors on a second and third layer of the plurality of layers along the first frequency reuse axis of the plurality of frequency reuse axes, the second and third layers each being adjacent the first layer.
Claim 3
Dependent Claim
29 words
The method of claim 1 and further including the step of repeating the cellular cluster to cover a geographical region, comprises a predetermined number of even numbered frequency groups.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein the cellular system has a first frequency reuse distance in a first direction and a second frequency reuse distance in a second direction.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the predetermined number of frequency groups is equal to a multiple of 6.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the second and third frequency layers are on either side of the first layer.
Claim 7
Independent Claim
237 words
A method for frequency allocation in a cellular system, the cellular system having a plurality of available frequencies and comprising a plurality of cells, each cell comprising six sectors and a plurality of directional antennas, each antenna radiating into a sector of the cell, the method comprising the steps of: forming a cellular cluster from seven of the cells, the cellular cluster having a plurality of frequency reuse axes, each frequency reuse axis comprising a plurality of layers parallel to each other, the cellular cluster comprising a center cell and six surrounding cells; grouping the plurality of available frequencies into a predetermined number of frequency groups, the frequency groups being numbered in a sequential manner; allocating a first series of odd numbered frequency groups along a first layer of a first frequency reuse axis; allocating a second series of even numbered frequency groups along a second and a third layer of the first frequency reuse axis; allocating a third series of odd numbered frequency groups along a first layer of a second frequency reuse axis; allocating a fourth series of even numbered frequency groups along a second and third layer of the second frequency reuse axis; allocating a fifth series of odd numbered frequency groups along a first layer of a third frequency reuse axis; and allocating a sixth series of even numbered frequency groups along a second and third layer of the third frequency reuse axis.
Claim 8
Independent Claim
237 words
A method for frequency allocation in a cellular system, the cellular system having a plurality of available frequencies and comprising a plurality of cells, each cell comprising six sectors and a plurality of directional antennas, each antenna radiating into a sector of the cell, the method comprising the steps of: forming a cellular cluster from seven of the cells, the cellular cluster having a plurality of frequency reuse axes, each frequency reuse axis comprising a plurality of layers parallel to each other, the cellular cluster comprising a center cell and six surrounding cells; grouping the plurality of available frequencies into a predetermined number of frequency groups, the frequency groups being numbered in a sequential manner; allocating a first series of odd numbered frequency groups along a first layer of a first frequency reuse axis; allocating a second series of even numbered frequency groups along a second and a third layer of the first frequency reuse axis; allocating a third series of odd numbered frequency groups along a first layer of a second frequency reuse axis; allocating a fourth series of even numbered frequency groups along a second and third layer of the second frequency reuse axis; allocating a fifth series of odd numbered frequency groups along a first layer of a third frequency reuse axis; and allocating a sixth series of even numbered frequency groups along a second and third layer of the third frequency reuse axis.
Claim 9
Dependent Claim
20 words
The method of claim 6 and further including the step of repeating the cellular cluster to cover a geographical area.
Claim 10
Dependent Claim
19 words
The method of claim 6 wherein the predetermined number of frequency groups is equal to a multiple of 6.
Claim 11
Dependent Claim
39 words
The method of claim 6 wherein the steps of allocating include allocating the frequencies in such a manner so as to create a first reuse distance in a first direction and a second reuse distance in a second direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-14 | 2002-06-15 | 2002-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-14 | 2006-06-15 | 2006-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-14 | 2010-06-15 | 2010-12-15 | $7700.00 | Window Closed / Lapsed |