INTERFERENCE-AWARE DETECTION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM

• US 20140126404A1
• Filed: 11/04/2013
• Published: 05/08/2014
• Est. Priority Date: 11/02/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Younsun, Kim, Youngbum, Lee, Juho, Lee, Hyojin, Cho, Joonyoung, Ji, Hyoungju
• Granted Patent: US 9,907,027 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04W 48/00 Access restriction access security to prevent unauthorised access H04W12/08; Network selection; Access point selection
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Methods and apparatus are provided for transmitting and receiving control information, for interference detection by a User Equipment (UE), in a wireless communication system. A base station determines whether the UE supports interference-aware detection. When the UE supports interference-aware detection, the control information is generated that includes interference signal modulation scheme information and demodulation reference signal measurement information. The control information is transmitted to the UE. The interference at the UE is measured based on the received control information.

Claims

1. A method for transmitting control information, for interference detection by a User Equipment (UE), in base station of a wireless communication system, the method comprising the steps of:

determining whether the UE supports interference-aware detection;

when the UE supports interference-aware detection, generating the control information comprising interference signal modulation scheme information and demodulation reference signal measurement information; and

transmitting the control information to the UE.

2. The method of claim 1, wherein the interference signal modulation scheme information comprises at least one modulation scheme applied to an interference signal and an indicator for indicating that the interference signal is not modulated in any modulation scheme.

3. The method of claim 2, wherein the indicator is configured when a strength of the interference signal to the UE is less than a predetermined level, when the interference signal is modulated in a specified modulation scheme, or when the interference signal exists at a part of a frequency band of a desired signal.

4. The method of claim 1, wherein the demodulation reference signal measurement information comprises information on a demodulation reference signal for the UE to receive a data channel, information on an interferer demodulation reference signal for the UE to measure interference, and information on a zero-power demodulation reference signal.

5. The method of claim 4, wherein the information on the zero-power demodulation reference signal is transmitted to the UE through one of higher layer signaling and physical layer signaling.

6. The method of claim 5, further comprising:

when the zero-power demodulation reference signal is applied to the UE, determining whether the zero-power demodulation reference signal exists in a same symbol as the demodulation reference signal for receiving the data channel; and

when the zero-power demodulation reference signal exists in the same symbol as the demodulation reference signal for receiving the data channel, boosting a transmission power of the demodulation reference signal for receiving the data channel with a transmission power saved by the zero-power demodulation reference signal.

7. The method of claim 4, wherein the information on the interferer demodulation reference signal comprises at least one of an initial state used in scrambling the demodulation reference signal, a demodulation reference signal port index, and a demodulation reference signal resource index.

8. A base station for transmitting control information for a User Equipment (UE) to detect interference in a wireless communication system, the base station comprising:

a transceiver configured to transmit and receive signals to and from the UE;

a controller configured to determine whether the UE supports interference-aware detection, generate the control information comprising interference signal modulation scheme information and demodulation reference signal measurement information when the UE supports interference-aware detection, and control the transceiver to transmits the control information to the UE.

9. The base station of claim 8, wherein the interference signal modulation scheme information comprises at least one modulation scheme applied to an interference signal and an indicator for indicating that the interference signal is not modulated in any modulation scheme.

10. The base station of claim 9, wherein the indicator is configured when strength of the interference signal to the UE is less than a predetermined level, when the interference signal is modulated in a specified modulation scheme, or when the interference signal exists at a part of a frequency band of a desired signal

11. The base station of claim 8, wherein the demodulation reference signal measurement information comprises information on a demodulation reference signal for the UE to receive a data channel, information on an interferer demodulation reference signal for the UE to measure interference, and information on a zero-power demodulation reference signal.

12. The base station of claim 11, wherein the information on the zero-power demodulation reference signal is transmitted to the UE through one of higher layer signaling and physical layer signaling.

13. The base station of claim 12, wherein the controller determines whether the zero-power demodulation reference signal exists in a same symbol as the demodulation reference signal for receiving the data channel when the zero-power demodulation reference signal is applied to the UE, and boosts a transmission power of the demodulation reference signal for receiving the data channel with a transmission power saved by the zero-power demodulation reference signal when the zero-power demodulation reference signal exists in the same symbol as the demodulation reference signal for receiving the data channel.

14. The base station of claim 11, wherein the information on the interferer demodulation reference signal comprises at least one of an initial state used in scrambling the demodulation reference signal, a demodulation reference signal port index, and a demodulation reference signal resource index.

15. A method for receiving control information for detecting interference in a User Equipment (UE) of a wireless communication system, the method comprising the steps of:

notifying a base station as to whether the UE supports interference-aware detection;

when the UE supports interference-aware detection, receiving the control information comprising interference signal modulation scheme information and demodulation reference signal measurement information; and

measuring the interference at the UE based on the received control information.

16. The method of claim 15, wherein the interference signal modulation scheme information comprises at least one modulation scheme applied to an interference signal and an indicator for indicating that the interference signal is not modulated in any modulation scheme.

17. The method of claim 16, wherein the indicator is configured when a strength of the interference signal to the UE is less than a predetermined level, when the interference signal is modulated in a specified modulation scheme, or when the interference signal exists at a part of a frequency band of a desired signal.

18. The method of claim 15, wherein the demodulation reference signal measurement information comprises information on a demodulation reference signal for the UE to receive a data channel, information on an interferer demodulation reference signal for the UE to measure interference, and information on a zero-power demodulation reference signal.

19. The method of claim 18, wherein the information on the zero-power demodulation reference signal is transmitted to the UE through one of higher layer signaling and physical layer signaling.

20. The method of claim 18, wherein the information on the interferer demodulation reference signal comprises at least one of an initial state used in scrambling the demodulation reference signal, a demodulation reference signal port index, and a demodulation reference signal resource index.

21. The method of claim 15, wherein measuring the interference comprises:

measuring an interference signal on respective frequency bands; and

generating a Log Likelihood Ratio (LLR) on the frequency bands using an interference signal modulation scheme included in the interference signal modulation scheme information of the control information.

22. A User Equipment (UE) for receiving control information from a base station in a wireless communication system, the UE comprising:

a transceiver configured to transmit and receive signals to and from the base station; and

a controller configured to notify a base station as to whether the UE supports interference-aware detection, receive the control information comprising interference signal modulation scheme information and demodulation reference signal measurement information when the UE supports interference-aware detection, and measure the interference at the UE based on the received control information.

23. The UE of claim 22, wherein the interference signal modulation scheme information comprises at least one modulation scheme applied to an interference signal and an indicator for indicating that the interference signal is not modulated in any modulation scheme.

24. The UE of claim 23, wherein the indicator is configured when strength of the interference signal to the UE is less than a predetermined level, when the interference signal is modulated in a specified modulation scheme, or when the interference signal exists at a part of a frequency band of a desired signal.

25. The UE of claim 22, wherein the demodulation reference signal measurement information comprises information on a demodulation reference signal for the UE to receive a data channel, information on an interferer demodulation reference signal for the UE to measure interference, and information on a zero-power demodulation reference signal.

26. The UE of claim 25, wherein the information on the zero-power demodulation reference signal is transmitted to the UE through one of higher layer signaling and physical layer signaling.

27. The UE of claim 25, wherein the information on the interferer demodulation reference signal comprises at least one of an initial state used in scrambling the demodulation reference signal, a demodulation reference signal port index, and a demodulation reference signal resource index.

28. The UE of claim 22, wherein the controller measures an interference signal on respective frequency bands, and generates a Log Likelihood Ratio (LLR) on the frequency bands using an interference signal modulation scheme included in the interference signal modulation scheme information of the control information.