DATA TRANSMISSION SYSTEM FOR DETERMINING DATA TRANSMISSION POWER USING A VIRTUAL CELL

• US 20110244900A1
• Filed: 01/19/2011
• Published: 10/06/2011
• Est. Priority Date: 04/06/2010
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: KWON, Tae Soo, LEE, Soo Hwan, YI, Yung, SHIN, Chang Yong, NOH, Won Jong
• Granted Patent: US 9,161,251 B2
• Time in Patent Office: Days
• US Class Current: 455/501
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A data transmission system that determines data transmission power using a virtual cell is provided. A base station may receive transmission data from a plurality of cooperative base stations positioned around the base station, and model terminals receiving an interference signal from the base station and the plurality of cooperative base stations into a virtual cell. The base station may calculate the influence of the interference signal transmitted to the terminal, using the virtual cell, and determine a transmission power for a plurality of frequency bands based on the interference signal.

Claims

1. A base station, comprising:

a reception unit configured to receive interference channel information between the base station and a plurality of first terminals from the plurality of first terminals receiving interference signals from another base station;

a virtual cell modeling unit configured to model the plurality of first terminals and a plurality of cooperative base stations transmitting data to each of the plurality of first terminals into a virtual cell, based on the received interference channel information; and

a transmission power determination unit configured to determine the transmission power for each of a plurality of frequency bands with respect to a second terminal receiving a second data signal from the base station, based on the virtual cell.

2. The base station of claim 1, wherein the reception unit is further configured to receive the interference channel information via at least one cooperative base station.

3. The base station of claim 1, wherein the interference channel information comprises at least one of:

an identifier of each of the plurality of first terminals, a channel gain of the interference channel, a transmission power of the first data signal, and data transmission priority of the plurality of first terminals.

4. The base station of claim 3, wherein the data transmission priority comprises at least one of:

a type of a service used by each first terminal, an amount of transmission data to be transmitted to the cooperative base station by each first terminal, and a time elapsed after receiving the most recently received data by each first terminal.

5. The base station of claim 3, wherein:

the reception unit is further configured to periodically receive at least one of;

the identifier of each of the plurality of first terminals, the channel gain of the interference channel, the transmission power of the first data signal, and the data transmission priority of the plurality of first terminals; and

a reception cycle for the identifier of each of the plurality of first terminals is shorter than a reception cycle for each of;

the channel gain of the interference channel, the transmission power of the first data signal, and the data transmission priority of the plurality of first terminals.

6. The base station of claim 1, wherein the reception unit is further configured to additionally receive, from the plurality of first terminals, information about a transmission channel between the cooperative base station and the plurality of first terminals.

7. The base station of claim 1, wherein the virtual cell modeling unit is further configured to model the virtual cell based on an average of the interference signals received from the base station by the plurality of first terminals.

8. The base station of claim 1, wherein the virtual cell modeling unit is further configured to model the virtual cell based on an interference signal comprising a greatest intensity from among the interference signals received from the base station by the plurality of first terminals.

9. The base station of claim 1, wherein the cooperative base station comprises a femto base station configured to transmit data using a radio resource unused by the base station.

10. The base station of claim 1, wherein:

the interference channel information is transmitted to the cooperative base station from the plurality of first terminals; and

the reception unit is further configured to;

receive the interference channel information using a backbone link between the cooperative base station and the base station;

or

directly receive the interference channel information from the plurality of first terminals.

11. The base station of claim 1, wherein the transmission power determination unit is further configured to determine the transmission power by one calculation.

12. A terminal, comprising:

a reception unit configured to receive interference signals from a base station using a plurality of frequency bands;

a channel estimation unit configured to generate, for each of the plurality of frequency bands, interference channel information about a channel between the base station and the terminal based on the interference signals; and

a transmission unit configured to transmit the interference channel information to the base station,

wherein an intensity of each of the interference signals is controlled for each of the plurality of frequency bands based on the interference channel information.

13. The terminal of claim 12, wherein the interference channel information comprises at least one of:

an identifier of the terminal, a channel gain of the interference channel, and a data transmission priority of the terminal.

14. The terminal of claim 13, wherein the data transmission priority comprises at least one of:

a service type used by the terminal, an amount of transmission data to be transmitted to a cooperative base station neighboring the base station by the terminal, and a time elapsed after receiving the most recently received data by the terminal.

15. The terminal of claim 13, wherein the transmission unit is further configured to:

transmit the identifier of the terminal in a first transmission cycle; and

transmit the channel gain of the interference channel and the data transmission priority of the terminal in a second transmission cycle that is greater than the first transmission cycle.

16. The terminal of claim 12, wherein the transmission unit is further configured to transmit the information about the interference channel to the base station via a cooperative neighboring base station.

17. The terminal of claim 12, wherein:

the interference channel information is used for modeling a virtual cell for the terminal; and

the interference signals are controlled based on the virtual cell.

18. A cooperative base station, comprising:

a reception unit configured to receive, from a terminal receiving interference signals from a base station, interference channel information between the base station and the terminal; and

a transmission unit configured to transmit the information about the interference channel to the base station,

wherein the reception unit is further configured to receive the interference channel information using a plurality of frequency bands, and

wherein an intensity of each of the interference signals is controlled for each of the plurality of frequency bands, based on the interference channel information.

19. The cooperative base station of claim 18, wherein the interference channel information includes at least one of an identifier of the terminal, a channel gain of the interference channel, and a data transmission priority of the terminal.

20. The cooperative base station of claim 19, wherein the data transmission priority comprises at least one of:

a service type used by the terminal, an amount of transmission data to be transmitted to the cooperative base station by the terminal, and a time elapsed after receiving the most recently received data by the terminal.

21. The cooperative base station of claim 18, wherein:

the interference channel information is used for modeling a virtual cell for the terminal; and

the interference signals are controlled based on the virtual cell.