SIGNAL TRANSMISSION METHOD AND SYSTEM FOR TRANSMITTING SIGNAL BY USING INTERFERENCE CONTROL METHOD AND/OR TRANSMISSION POWER CONTROL METHOD

• US 20100227637A1
• Filed: 08/26/2009
• Published: 09/09/2010
• Est. Priority Date: 03/03/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KWON, Tae Soo, KIM, Young-Doo, JANG, Kyung Hun
• Granted Patent: US 8,892,045 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04J 11/0026 of multi-user interference
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided are a signal transmission method and a network apparatus to control interference in a radio communication network. A terminal may transmit to the network apparatus, signal quality information associated with a radio channel formed between the terminal and a corresponding base station. The corresponding base station may output a signal received by the plurality of terminals, based on the signal quality information.

Claims

1. A network apparatus comprising:

a receiver configured to receive signal quality information associated with each of a plurality of terminals that are included in a communication network having a base station; and

a decision unit configured to determine whether to apply an interference control scheme to a signal output by the base station that is received by the plurality of terminals, based on the signal quality information.

2. The network apparatus of claim 1, wherein the communication network includes a plurality of base stations and the signal quality information with respect to a designated terminal among the plurality of terminal to receive the signal is calculated based on at least one of:

a gain of a signal channel formed between the base station and the plurality of terminals,

a signal transmission power of the base station,

a gain of an interference channel formed between each base station among the plurality of base stations acting as an interference base station and the plurality of terminals,

an interference signal transmission power of each interference base station, and

a noise power of the plurality of terminals.

3. The network apparatus of claim 1, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

4. The network apparatus of claim 3, wherein the base station controls a phase of the signal.

5. The network apparatus of claim 1, wherein, in response to the signal quality information being greater than or equal to a predetermined reference value, the decision unit determines to apply the interference control scheme to the signal.

6. The network apparatus of claim 1, wherein, in response to at least two interference signals being received by the plurality of terminals, the decision unit determines to apply the interference control scheme to the signal.

7. The network apparatus of claim 1, wherein, in response to the decision unit determining to not apply the interference control scheme to the signal, the base station outputs the signal by applying a transmission power control scheme to the signal.

8. The network apparatus of claim 1, wherein the decision unit determines to apply the interference control scheme to the signal, and the base station further applies a transmission power control scheme to the signal to which the interference control scheme is applied.

9. A network apparatus comprising:

a selection unit configured to select at least one of an interference control scheme and a transmission power control scheme with respect to a plurality of terminals that are included in a communication network having a base station; and

a signal transmitter configured to output a signal received by the plurality of terminals, according to a control of the selection unit.

10. The network apparatus of claim 9, further comprising:

a radio resource management unit configured to manage radio resources that are pre-allocated to apply the interference control scheme and radio resources that are pre-allocated to apply the transmission power control scheme,

wherein the selection unit selects at least one of the interference control scheme and the transmission power control scheme by referring to the radio resource management unit.

11. The network apparatus of claim 10, wherein the transmission power control scheme is further applied to the radio resources that are pre-allocated to apply the interference control scheme.

12. The network apparatus of claim 10, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

13. The network apparatus of claim 12, wherein the base station controls a phase of the signal.

14. The network apparatus of claim 9, wherein the network apparatus is included in a base station control unit.

15. A terminal comprising:

a receiver configured to receive, from a corresponding base station and a plurality of base stations acting as interference base stations, a signal and interference signals that are output using at least one of an interference control scheme and a transmission power control scheme; and

a signal quality information generation unit configured to generate signal quality information to be transmitted to the corresponding base station,

wherein the signal from the corresponding base station is a signal to which at least one of the interference control scheme and the transmission power control scheme is applied based on the signal quality information.

16. The terminal of claim 15, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

17. The terminal of claim 16, wherein a phase of the main signal is controlled.

18. A method of transmitting a radio signal in a communication network, the method comprising:

receiving signal quality information associated with each of a plurality of terminals that are included in the communication network having a base station; and

determining whether to apply an interference control scheme to a signal output by the base station that is received by the plurality of terminals, based on the signal quality information.

19. The method of claim 18, wherein the communication network includes a plurality of base stations and the signal quality information with respect to a designated terminal among the plurality of terminals to receive the signal is calculated based on at least one of:

a gain of a signal channel formed between the base station and the plurality of terminals,

a signal transmission power of the base station,

a gain of an interference channel formed between each base station among the plurality of base stations acting as an interference base station and the plurality of terminals,

an interference signal transmission power of each interference base station, and

a noise power of the plurality of terminals.

20. The method of claim 18, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

21. The method of claim 18, wherein the base station controls a phase of the signal.

22. The method of claim 18, wherein the determining comprises determining to apply the interference control scheme to the signal in response to the signal quality information being greater than or equal to a predetermined reference value.

23. The method of claim 18, wherein the determining comprises determining to apply the interference control scheme to the signal in response to at least two interference signals being received by the plurality of terminals.

24. The method of claim 18, further comprising outputting the signal by applying a transmission power control scheme to the signal in response to determining to not apply the interference control scheme to the signal.

25. The method of claim 18, further comprising outputting the signal, wherein the outputting of the signal comprises:

applying the interference control scheme to the signal in response to determining to apply the interference control scheme; and

applying a transmission power control scheme to the signal to which the interference control scheme is applied.

26. A method of transmitting a radio signal in a communication network, the method comprising:

selecting at least one of an interference control scheme and a transmission power control scheme with respect to a plurality of terminals that are included in of the communication network having a base station; and

outputting a signal received by the plurality of terminals using the selected control scheme.

27. The method of claim 26, further comprising:

managing radio resources that are pre-allocated to apply the interference control scheme and radio resources that are pre-allocated to apply the transmission power control scheme,

wherein the selecting comprises selecting at least one of the interference control scheme and the transmission power control scheme by referring to the pre-allocated radio resources.

28. The method of claim 27, wherein the outputting of the signal comprises further applying the transmission power control scheme to the radio resources that are pre-allocated to apply the interference control scheme.

29. The method of claim 26, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

30. The method of claim 26, wherein the outputting of the signal comprises controlling a phase of the signal.

31. A method of receiving a radio signal, the method comprising:

receiving, from a corresponding base station and a plurality of base stations acting as interference base stations, a signal and interference signals that are output using at least one of an interference control scheme and a transmission power control scheme; and

generating signal quality information to be transmitted to the corresponding base station,

wherein the signal from the corresponding base station is a signal to which at least one of the interference control scheme and the transmission power control scheme is applied to based on the signal quality information.

32. The method of claim 31, wherein the interference control scheme is one of an interference alignment scheme, an interference neutralization scheme, an interference cancellation scheme, and an interference treated as noise scheme.

33. The method of claim 32, wherein a phase of the main signal is controlled.

34. A signal processing method for a radio communication network having a plurality of base stations and a plurality of terminals, the method comprising:

determining a first radio resource region to apply an interference control scheme, based on states of radio channels formed between the plurality of base stations and the plurality of terminals;

determining a second ratio resource region to apply a transmission power control scheme;

applying the interference control scheme to a signal corresponding to the first radio resource region; and

applying the transmission power control scheme to a signal corresponding to the second radio resource region.

35. The method of claim 34, wherein an aggregate of the first radio resource region and the second radio resource region is the entire radio resource region that is allocated to the radio communication network.

36. The method of claim 34, wherein the first radio resource region does not overlap with the second radio resource region.

37. The method of claim 34, wherein the first radio resource region at least partially overlaps with the second radio resource region.

38. A computer-readable storage medium storing a program to transmit a radio signal in a communication network, comprising instructions to cause a computer to:

receive signal quality information associated with each of a plurality of terminals that are included in the communication network having a base station; and

determine whether to apply an interference control scheme to a signal output by the base station that is received by the plurality of terminals, based on the signal quality information.

39. A computer-readable storage medium storing a program to transmit a radio signal in a communication network, comprising instructions to cause a computer to:

select at least one of an interference control scheme and a transmission power control scheme with respect to a plurality of terminals that are included in of the communication network having a base station; and

output a signal received by the plurality of terminals using the selected control scheme.

40. A computer-readable storage medium storing a program to receiving a radio signal, comprising instructions to cause a computer to:

receive, from a corresponding base station and a plurality of base stations acting as interference base stations, a signal and interference signals that are output using at least one of an interference control scheme and a transmission power control scheme; and

generate signal quality information to be transmitted to the corresponding base station,

wherein the signal from the corresponding base station is a signal to which at least one of the interference control scheme and the transmission power control scheme is applied to based on the signal quality information.

41. A computer-readable storage medium storing a program to process a signal for a radio communication network having a plurality of base stations and a plurality of terminals, comprising instructions to cause a computer to:

determine a first radio resource region to apply an interference control scheme, based on states of radio channels formed between the plurality of base stations and the plurality of terminals;

determine a second ratio resource region to apply a transmission power control scheme;

apply the interference control scheme to a signal corresponding to the first radio resource region; and

apply the transmission power control scheme to a signal corresponding to the second radio resource region.