Method for controlling interface between adjacent cells in cellular system

• US 8,594,577 B2
• Filed: 06/30/2011
• Issued: 11/26/2013
• Est. Priority Date: 12/22/2010
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Yoon Ju, Seo, Jongpil, Lee, Meong-Hun, Chung, Jaehak, Kim, Hyunsoo, Kwon, Dong Seung
• Primary Examiner(s): Dao, Minh D
• Application Number:
  US13/173,746
• Publication Number:
  US 20120164949A1
• Time in Patent Office: 880 Days
• Field of Search: 455/63.1, 455/114.2, 455/278.1, 455/296, 455/453, 455/562.1, 455/446, 375/296
• US Class Current: 455/63.1
• CPC Class Codes: H04J 11/0056 Inter-base station aspects
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method of transmitting data from a terminal in a cellular system is provided. The data transmission method includes: calculating the transmission capacity of a predetermined number of vectors among pairs of orthogonal vectors; selecting the vector having the largest transmission capacity as a reference vector among the predetermined number of vectors; and transmitting data to a base station using the reference vector.

Claims

1. A method of transmitting data from a terminal in a cellular system, the method comprising:

calculating the transmission capacity of a predetermined number of vectors among pairs of orthogonal vectors;

selecting the vector having the largest transmission capacity as a reference vector among the predetermined number of vectors; and

transmitting data to a base station using the reference vector.

2. The method of claim 1, further comprising receiving the pairs of orthogonal vectors from the base station.

3. The method of claim 1, wherein the predetermined number of vectors are assigned to the terminal.

4. The method of claim 1, further comprising,

before the transmitting of data to the base station,

transmitting information about the reference vector to the base station.

5. The method of claim 4, wherein the information about the reference vector includes the index of the reference vector.

6. A method for a base station to control interference between adjacent cells in a multi-cell environment, the method comprising:

generating pairs of orthogonal vectors depending on the number of cells surrounding the base station;

transmitting the pairs of orthogonal vectors to a terminal located within the coverage area of the base station;

receiving information about a reference vector from the terminal; and

eliminating interference signals from adjacent cells from signals received from the terminal using the information about the reference vector.

7. The method of claim 6, wherein the pairs of orthogonal vectors are generated using a unitary matrix.

8. The method of claim 6, wherein the reference vector is selected by the terminal from among the vectors included in the pairs of orthogonal vectors.

9. The method of claim 8, wherein the reference vector has the largest transmission capacity among the vectors included in the pairs of orthogonal vectors.

10. The method of claim 6, wherein the information about a reference vector is the index of the reference vector.

11. The method of claim 6, wherein

the eliminating of interference signals from adjacent cells comprises:

extracting a vector orthogonal to the reference vector from the pairs of orthogonal vectors; and

eliminating interference signals from the adjacent cells by multiplying the vector orthogonal to the reference vector by the signals received from the terminals.

12. A method for a terminal to set a reference vector in order to control interference between adjacent cells, the method comprising:

receiving pairs of orthogonal vectors from a base station;

extracting a predetermined number of vectors assigned to the terminal from the pairs of orthogonal vectors; and

selecting a reference vector among the predetermined number of vectors based on transmission capacity.

13. The method of claim 12, wherein the pairs of orthogonal vectors are generated using a unitary matrix.

14. The method of claim 12, wherein

the selecting of a reference vector comprises:

calculating the transmission capacity of the predetermined number of vectors; and

selecting a vector having the largest transmission capacity as the reference vector among the predetermined number of vectors.

15. The method of claim 14, wherein the transmission capacity is calculated by the following equation: