METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM

• US 20130250788A1
• Filed: 03/22/2013
• Published: 09/26/2013
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Younsun, LEE, Hyojin, LEE, Juho, KIM, Kiil
• Granted Patent: US 9,301,181 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

An interference measurement method of a terminal is provided for facilitating downlink transmission in the mobile communication system based on Distributed Antenna System (DAS) in which multiple antennas controlled by a base station are distributed within the service area of the base station. The interference measurement method includes receiving channel measurement information and interference measurement information from a base station, receiving channel state information reference signals, calculating, when the received channel state information reference signal is for channel measurement, a received signal energy based on the channel measurement information and, when the received channel state information reference signal is for interference measurement, an interference based on the interference measurement information, generating channel quality information based on the received signal energy and the interference, and transmitting the channel quality information to the base station.

Claims

1. An interference measurement method of a terminal in a wireless communication system, the method comprising:

receiving channel measurement information and interference measurement information from a base station;

receiving channel state information reference signals;

calculating, when the received channel state information reference signal is for channel measurement, a received signal energy based on the channel measurement information;

calculating, when the received channel state information reference signal is for interference measurement, an interference based on the interference measurement information;

generating channel quality information based on the received signal energy and the interference; and

transmitting the channel quality information to the base station.

2. The method of claim 1, wherein the channel measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna for use in data transmission to the terminal, and

wherein the interference measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna incurring interference to the terminal.

3. The method of claim 1, wherein the interference measurement information is set per channel state information reference signal for interference measurement.

4. The method of claim 1, wherein the interference measurement information is set commonly for all channel state information reference signals for interference measurement.

5. The method of claim 1, wherein the generating of the channel quality information comprises calculating the channel quality information by reflecting interference and noise with the exception of the interference measured based on the channel state information reference signal.

6. A terminal for measuring interference in a wireless communication system, the terminal comprising:

a transceiver for communicating a base station; and

a controller for controlling reception of channel measurement information and interference measurement information from a base station;

receiving channel state information reference signals, for calculating, when the received channel state information reference signal is for channel measurement, a received signal energy based on the channel measurement information, for calculating, when the received channel state information reference signal is for interference measurement, an interference based on the interference measurement information, for generating channel quality information based on the received signal energy and the interference; and

for transmitting the channel quality information to the base station.

7. The terminal of claim 6, wherein the channel measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna for used in data transmission to the terminal, and

wherein the interference measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna incurring interference to the terminal.

8. The terminal of claim 6, wherein the interference measurement information is set per channel state information reference signal for interference measurement.

9. The terminal of claim 6, wherein the interference measurement information is set commonly for all channel state information reference signals for interference measurement.

10. The terminal of claim 6, wherein the controller generates the channel quality information by reflecting interference and noise with the exception of the interference measured based on the channel state information reference signal.

11. A method for a base station to control interference measurement of a terminal in a wireless communication system, the system comprising:

transmitting channel measurement information and interference measurement information to the terminal;

transmitting channel state information reference signals to the terminal; and

receiving channel quality information from the terminal,

wherein the channel quality information is generated based on received signal energy calculated based on the channel measurement information, and

wherein the interference information is calculated based on the interference measurement information.

12. The method of claim 11, wherein the channel measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna for used in data transmission to the terminal, and

wherein the interference measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna incurring interference to the terminal.

13. The method of claim 11, further comprising exchanging the interference measurement information with neighbor base stations.

14. The method of claim 11, wherein the interference measurement information is set per channel state information reference signal for interference measurement.

15. The method of claim 11, wherein the interference measurement information is set commonly for all channel state information reference signals for interference measurement.

16. A base station for controlling interference measurement of a terminal in a wireless communication system, wherein the base station comprising:

a transceiver for communicating with the terminal; and

a controller for controlling transmission of channel measurement information and interference measurement information to the terminal, for transmitting channel state information reference signals to the terminal, and for receiving channel quality information from the terminal,

wherein the channel quality information is generated based on received signal energy calculated based on the channel measurement information, and

wherein the interference information is calculated based on the interference measurement information.

17. The base station of claim 16, wherein the channel measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna for used in data transmission to the terminal, and

wherein the interference measurement information is a transmit power ratio between the channel state information reference signal and data channel transmitted through a certain antenna incurring interference to the terminal.

18. The base station of claim 16, wherein the controller controls exchanging the interference measurement information with neighbor base stations.

19. The base station of claim 16, wherein the interference measurement information is set per channel state information reference signal for interference measurement.

20. The base station of claim 16, wherein the interference measurement information is set commonly for all channel state information reference signals for interference measurement.