Frequency assigning method for an eight cell frequency re-use plan providing cellular communications system without adjacent frequency channels

• US 6,097,708 A
• Filed: 12/31/1996
• Issued: 08/01/2000
• Est. Priority Date: 12/31/1996
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Mao, Tom
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): Sam, Phirin
• Application Number:
  US08/777,818
• Time in Patent Office: 1,309 Days
• Field of Search: 370/329, 370/328, 370/334, 370/336, 370/338, 370/339, 370/341, 370/343, 370/330, 370/322, 370/348, 455/422, 455/426, 455/439, 455/440, 455/446, 455/447, 455/448, 455/449, 455/450, 455/452, 455/455, 455/464, 455/63, 455/550, 455/278.1, 455/283, 455/296, 455/463, 455/40 3
• US Class Current: 370/329
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]

Abstract

A cell cluster for use with a frequency re-use pattern is disclosed. The cell cluster comprises eight antenna sites arranged in first and second adjacent columns having four sites associated with the first column and four sites associated with the second column. Frequency groups are assigned to each of the antenna sites such that no adjacent channel interference exist between the antenna sites or between any similarly configured cell clusters associated with the cell cluster.

Claims

1. A cell cluster for use with a frequency re-use pattern, wherein the cell cluster comprises:

eight cells arranged in first and second adjacent columns, wherein the first column includes four adjacent cells and the second column includes four adjacent cells; and

eight frequency groups assigned to the eight cells such that there are no adjacent channels between any of the adjacent cells once each of the frequency groups are assigned to a cell, said eight frequency groups comprising all available frequency channels.

2. The cell cluster of claim 1 wherein location of the eight cells with other similarly arranged clusters of eight cells creates no adjacent channels between cells of any adjacent clusters.

3. The cell cluster of claim 2 wherein horizontal distance between co-channels is 3R.

4. The cell cluster of claim 2 wherein vertical distance between co-channels and cells is 8R.

5. The cell cluster of claim 2 wherein diagonal distance between co-channels is 3R in the horizontal and 8R in the vertical.

6. The cell cluster of claim 1 further including omnidirectional antenna sites associated with each of the eight cells.

7. The cell cluster of claim 1 further including sectorized antenna sites located at the center of each of the eight cells.

8. The cell cluster of claim 7 wherein the horizontal distance between co-channels is 3R.

9. The cell cluster of claim 7 wherein vertical distance between co-channels is 4√

3R.

10. The cell cluster of claim 7 wherein the diagonal distance between co-channels is 3R in the horizontal and 4√

3R in the vertical.

11. The cell cluster of claim 1 wherein the eight frequency groups are designated a, b, c, d, e, f, g, and h, respectively, and all frequency channels are assigned from frequency group a to frequency group h in a repeating and sequential fashion.

12. The cell cluster of claim 11 wherein no two adjacent frequency groups are assigned to physically adjacent cells of the cell cluster.

13. A frequency re-use plan comprising:

eight antenna sites associated together in a repeating pattern; and

eight frequency groups assigned to the antenna sites such that no two antenna sites have adjacent frequency channels between them once each of the frequency groups are assigned, said eight frequency groups comprising all available frequency channels.

14. The frequency re-use plan of claim 13 wherein each antenna site comprises a sectorized antenna site transceiving signals in three cells arranged in a clover-leaf fashion, the sectorized antenna pointing azimuth of each cell separated by 120°

.

15. The frequency re-use plan of claim 13 wherein horizontal distance between co-channels is 6R.

16. The cell cluster of claim 13 wherein vertical distance between co-channels is 12R.

17. The cell cluster of claim 13 wherein diagonal distance between co-channels is 6R in the horizontal and 12R in the vertical.

18. A cell cluster for use with a frequency re-use plan comprising:

eight cells arranged in first and second adjacent vertical columns wherein the first column includes four cells and the second column includes four cells;

eight frequency groups consisting of non-adjacent frequency channels in each frequency group, wherein each of the eight frequency groups are assigned to one of the eight cells such that there are no adjacent channels between any of the cells with the eight cells and any similarly configured cell cluster associated with the cell cluster, said eight frequency groups comprising all available frequency channels.

19. The cell cluster of claim 18 further including omnidirectional antenna sites associated with each of the eight cells.

20. The cell cluster of claim 18 further including sectorized antenna sites located at the center of each of the eight cells.

21. The cell cluster of claim 18 wherein the eight frequency groups are designated a, b, c, d, e, f, g, and h, respectively, and all frequency channels are assigned from frequency group a to frequency group h in a repeating and sequential fashion.

22. The cell cluster of claim 18 wherein the frequency groups comprise three sub-groups having non-adjacent frequency channels assigned thereto.