SYSTEM AND METHOD FOR DYNAMIC INTER-CELL INTERFERENCE COORDINATION

• US 20140105122A1
• Filed: 10/17/2012
• Published: 04/17/2014
• Est. Priority Date: 10/17/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Liqing, Ma, Jianglei
• Granted Patent: US 10,085,154 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/27 between access points

Abstract

A system including a cell controller and a method for dynamic inter-cell interference coordination based on a strong interference neighbor relationship table (SI-NRT) are provided. In the method, the cell controller generates a SI-NRT based on a predefined threshold value and interferences from a plurality of neighbor cells. The cell controller determines whether a cell needs additional high power frequency band and determines whether there is available high power frequency band in the plurality of neighboring cells based on the SI-NRT.

Claims

1. A method for assigning high power frequency bands in a communication system, comprising:

generating, in a cell controller having a processor, a strong interference neighbor relationship table (SI-NRT) based on a predefined threshold value and interferences from a plurality of neighbor cells;

determining, in the cell controller, whether a cell needs an additional high power frequency band; and

determining, in the cell controller, whether there is available a high power frequency band in the plurality of neighboring cells based on the SI-NRT.

2. The method of claim 1, wherein the cell controller determines whether the cell needs an additional high power frequency band based on at least one of the following:

a traffic load of all cell center users (CCUs);

a traffic load of all cell edge users (CEUs); and

a ratio of the traffic loads between all CEUs and all CCUs.

3. The method of claim 1, wherein the cell controller generates the SI-NRT based on a ratio between a maximum interference level and each of the interference levels from the plurality of neighbor cells.

4. The method of claim 3, wherein the SI-NRT consists of cells that have the ratio greater than the predefined threshold.

5. The method of claim 4, wherein the SI-NRT for cell i consists of cells that meet the following condition:

6. The method of claim 5, wherein determining, in the cell controller, whether there is an available high power frequency band in the plurality of neighboring cells based on the SI-NRT for cell i comprises at least one of the following:

determining whether a high power frequency band candidate is used by the plurality of neighbor cells;

determining whether the high power frequency band candidate is used by the cells in the SI-NRT(i); and

determining whether any cell having cell i in its SI-NRT is using the high power frequency band candidate.

7. The method of claim 1, further comprising:

assigning the high power frequency band to the cell i when the assignment does not change its own SI-NRT and any SI-NRT of the plurality of neighbor cells.

8. A cell controller, comprising:

a processor coupled with a non-transient storage medium;

the non-transient storage medium storing a set of instructions for assigning high power frequency bands in a communication system, the set of instructions to direct the processor to perform acts of;

generating a strong interference neighbor relationship table (SI-NRT) based on a predefined threshold value and interferences from a plurality of neighbor cells;

determining whether a cell needs an additional high power frequency band; and

determining whether there is available a high power frequency band in the plurality of neighboring cells based on the SI-NRT.

9. The cell controller of claim 8, wherein the processor determines whether the cell needs additional high power frequency band based on at least one of the following:

a traffic load of all cell center users (CCUs);

a traffic load of all cell edge users (CEUs); and

a ratio of the traffic loads between CEUs and CCUs.

10. The cell controller of claim 9, wherein the cell controller generates the SI-NRT based on a ratio between a maximum interference level and each of the interference levels from the plurality of neighbor cells.

11. The cell controller of claim 10, wherein the SI-NRT consists of cells that have the ratio greater than the predefined threshold.

12. The cell controller of claim 11, wherein the SI-NRT for cell i consists of neighboring cells that meet the following condition:

13. The cell controller of claim 12, wherein determining whether there is available high power frequency band in the plurality of neighboring cells based on the SI-NRT for cell i comprises at least one of the following:

determining whether a high power frequency band candidate is used by the plurality of neighbor cells;

determining whether the high power frequency band candidate is used by the cells in the SI-NRT(i); and

determining whether any cell having cell i in its SI-NRT is using the high power frequency band candidate.

14. The cell controller of claim 8, wherein the set of instructions further directs the processor to perform acts of:

assigning the high power frequency band to the cell i when the assignment does not change its own SI-NRT and any SI-NRT of the plurality of neighbor cells.

15. A communication system, comprising:

a plurality of cells communicating with each other, each cell comprising a cell controller having a processor configured to;

generate a strong interference neighbor relationship table (SI-NRT) based on a predefined threshold value and interferences from a plurality of neighbor cells;

determine whether the cell needs an additional high power frequency band; and

determine whether there is available a high power frequency band in the plurality of neighboring cells based on the SI-NRT.

16. The communication system of claim 15, wherein the processor is configured to determine whether the cell needs additional high power frequency band based on at least one of the following:

a traffic load of all cell center users (CCUs);

a traffic load of all cell edge users (CEUs); and

a ratio of the traffic loads between CEUs and CCUs.

17. The communication system of claim 16, wherein the processor is configured to generate the SI-NRT based on a ratio between a maximum interference level and each of the interference levels from the plurality of neighbor cells.

18. The communication system of claim 17, wherein the SI-NRT consists of cells that have the ratio greater than the predefined threshold.

19. The communication system of claim 18, wherein the SI-NRT for cell i consists of cells that meet the following condition:

20. The communication system of claim 19, wherein the processor is configured to:

determine whether a high power frequency band candidate is used by the plurality of neighbor cells;

determine whether the high power frequency band candidate is used by the cells in the SI-NRT(i); and

determine whether any cell having cell i in its SI-NRT is using the high power frequency band candidate.

21. The communication system of claim 15, wherein the processor is configured to assign the high power frequency band to the cell i when the assignment does not change its own SI-NRT and any SI-NRT of the plurality of neighbor cells.