EP0435283A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Antenna arrangement system capable of reducing co-channel interference
Assignee: NEC Corp
•
Filing: 1990-12-27
•
Granted: —
•
Expires: 2010-12-27
Abstract
Abstract An antenna arrangement system having a plurality of radio base stations each of which defines a cell approximated by a regular hexagon and divided into six sectors first and second ones of which are directed towards an angle of 0 degree with respect to an x-axis and towards an angle of 180 degrees, respectively, in an orthogonal coordinate system, first and second base stations are selected from the radio base stations to assign a common frequency channel to the first and the second sectors, respectively, and are located at first and second coordinate positions, respectively. The first and the second coordinate positions may be represented by (√ 3 Rni, 3Rj/2) and (√ 3 R(2ni-1)/2, 3Rj/2) where j takes an even number and an odd number, respectively, and R is representative as a real number; n, a natural number; i and j, integers. Alternatively, the first and the second coordinate positions may be represented by (√ 3 Rni, 3Rj/2) and (√ 3 R(3ni-3)/2, 3Rj/2) under the same conditions. The first and the second coordinate positions may not be restricted to the above-exemplified positions.
Inventors
- 👤 Toshihito C/O Nec Corporation Kanai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:18
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/02; H04W16/12; H04W16/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
329 words
An antenna arrangement system for use in a cellular system which comprises a plurality of radio base stations dispersed in a service area which is defined by an orthogonal coordinate system having an x-axis and a y-axis orthogonal to the x-axis, the radio base stations having cells approximately specified by regular hexagonal configurations, respectively, and being located at x- and y-axis positions which are specified by i, j, and R, where i and j are integers determined in directions of the x- and the y-axes, respectively, and R is representative of a length or each side of the regular hexagonal configurations, the x- and the y-axis positions of the respective radio base stations being given by: x = √ 3 Ri, (when j is an even number) or √ 3 R(2i - 1)/2 (when j is an odd number), and y = 3Ri/2, each of said radio base stations having a selected net of directional antennae which is selected from a group consisting or a first set of six directional antennae and a second set of three directional antennae, said selected set of the directional antennae having different frequency channels assigned thereto and including a first antenna which has directivity directed towards an angle of 0 degree with respect to a positive direction of a selected one of the x- and the y-axes and a second antenna which has directivity directed towards an angle of 180 degrees with respect to the positive direction of the selected one of the x- and y-axes, wherein the plurality of the radio base stations include first and second selected base stations which have first and second coordinate positions spaced apart from each other , which have sectors determined by the first and the second antennae directed towards the angles of 0 and 180 degrees opposite to each other, respectively, and which have a common one of the frequency channels that is assigned to the sectors determined by the first and the second antennae.
Claim 2
Dependent Claim
97 words
An antenna arrangement system as claimed in Claim 1, the first and the second selected base stations being located in said coordinate system at the first and the second coordinate positions specified by an even number and an odd number of j, respectively, the selected one of the x- and the y-axes being the x-axis, wherein the first coordinate positions are given by (√ 3 Rnk, 3Rj/2) where j takes an even number and n is a natural number while the second coordinate positions are given by √ 3 R(2nk-1)/2, 3Rj/2 where j takes an odd number.
Claim 3
Dependent Claim
97 words
An antenna arrangement system as claimed in Claim 1, the first and the second selected base stations being located in said coordinate system at the first and the second coordinate positions specified by an even number and an odd number of j, respectively, the selected one of the x- and the y-axes being the x-axis, wherein the first coordinate positions are given by (√ 3 Rnk, 3Rj/2) where j takes an even number and n is a natural number while the second coordinate positions are given by √ 3 R(2nk-3)/2, 3Rj/2 where j takes an odd number.
Claim 4
Dependent Claim
327 words
An antenna arrangement system for use in a cellular system which comprises a plurality of radio base stations dispersed in a service area which is defined by an orthogonal coordinate system having an x-axis and a y-axis orthogonal to the x-axis, the radio base stations approximately defining cells of regular hexagonal configurations, respectively, and being located at x- and y-axis positions which are specified by i, j, and R, where i and j are integers determined in directions of the x- and the y-axes, respectively, and R is representative of a length of each side of the regular hexagonal configurations, the x- and the y-axis positions of the respective radio base stations being given by: x = 3Ri/2 and y = √ 3 Rj, (when i is an even number) or √ 3 R(2j - 1)/2 (when i is an odd number), each of said radio base stations having a selected set of directional antennae which is selected from a group consisting of a first set of six directional antennae and a second set of three directional antennae, said selected set of the directional antennae having different frequency channels assigned thereto and including a first antenna which has directivity directed towards an angle of 0 degree with respect to a positive direction of a selected one of the x- and the y-axes and a second antenna which has directivity directed towards an angle of 180 degrees with respect to the positive direction of the selected one of the x- and y-axes, wherein the plurality of the radio base stations include first and second selected base stations which have first and second coordinate positions spaced apart from each other, which have sectors determined by the first and the second antennae directed towards the angles of 0 and 180 degrees opposite to each other, respectively, and which have a common one of the frequency channels, that is assigned to the sectors determined by the first and the second antennae.
Claim 5
Dependent Claim
74 words
An antenna arrangement system as claimed in Claim 4, the first and the second selected base stations being located in said coordinate system at the first and the second coordinate positions having predetermined x-axis positions specified by 0, the selected one of the x- and the y-axes being the x-axis, wherein the first coordinate positions are given by (0, 2√ 3 Rj) while the second coordinate positions are given by (0, √ 3 R(2j-1).
Claim 6
Dependent Claim
83 words
An antenna arrangement system as claimed in Claim 4, the first and the second selected base stations being located in said coordinate system at the first and the second coordinate positions, said first coordinate positions having predetermined x-axis positions specified by 0, respectively, the selected one of the x-and the y-axes being the x-axis, wherein the first coordinate positions are given by (0, √ 3 Rj) where j is an integer while the second coordinate positions are given by (-3R/2, √ 3 R(2j-1)/2).
Claim 7
Dependent Claim
281 words
An antenna arrangement system for use in a cellular system which comprises a plurality of radio base stations dispersed in a service area which is defined by an orthogonal coordinate system having an x-axis and a y-axis orthogonal to the x-axis, the radio base stations approximately defining cells of regualar hexagonal configurations, respectively, and being located at x- and y-axis positions which are specified by i, j, and R, where i and j are integers determined in directions of the x- and the y-axes, respectively, and R is representative of a length of each side of the regular hexagonal configurations, the x- and the y-axis positions or the respective radio base stations being given by: x = 3Ri/2 and y = √ 3 Rj,(when i is an even number) or √ 3 R(2j - 1)/2 (when i is an odd number), each of said radio base stations having three directional antennae having different frequency channels assigned thereto and including a preselected antenna which has directivity directed towards an angle of 0 degree with respect to a positive direction of a selected one of the x- and the y-axes, wherein: the plurality of the radio base stations include reuse channel stations which are located at coordinate positions spaced apart from each other, which have sectors determined by the preselected antennae in the respective reuse channel stations, and which have a common one of the frequency channels that is assigned to the sectors determined by the preselected antennae; the coordinate positions of said reuse channel stations being specified by (3Rni/2, 3 √ 3 Rj) when ni takes an even number and by (3Rni/2, 3 √ 3 R(2j-1)/2) when ni takes an odd number.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.