METHOD FOR TRANSMITTING NETWORK SUPPORT INFORMATION FOR REMOVING INTERFERENCE AND SERVING CELL BASE STATION

• US 20150373569A1
• Filed: 02/07/2014
• Published: 12/24/2015
• Est. Priority Date: 02/08/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: HWANG, Jinyup, LEE, Sangwook, JUNG, Manyoung, YANG, Yoonoh, LIM, Suhwan
• Granted Patent: US 9,838,894 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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: H04L 47/12 Avoiding congestion; Recovering from congestion
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

One embodiment of the present specification provides a method for transmitting network assistance information in one serving cell in order to perform interference cancellation of a terminal. The method may be performed by a serving cell and may comprise: determining whether a traffic load is above or below a first threshold; determining whether a traffic load of a neighbor cell is above or below a second threshold; determining a target for which the interference cancellation is to be performed by the terminal, on the basis of the determined result for the traffic load of the serving cell and the determined result for the traffic load of the neighbor cell; and transmitting to the terminal the network assistance information including the information regarding the determined target.

Claims

1. A method of transmitting network assistance information in one serving cell in order to perform interference cancellation of a terminal, the method comprising:

determining, by the serving cell, whether a traffic load is above or below a first threshold;

determining, by the serving cell, whether a traffic load of a neighbor cell is above or below a second threshold;

determining a target for which the interference cancellation is to be performed by the terminal, on the basis of the determined result for the traffic load of the serving cell and the determined result for the traffic load of the neighbor cell; and

transmitting to the terminal the network assistance information including the information regarding the determined target.

2. The method of claim 1, wherein in the determining of the interference cancellation target, it is determined whether the target for which the interference cancellation is to be performed is a neighbor cell'"'"'s channel state indicator reference signal (CSI-RS) or a physical downlink shared channel (PDSCH).

3. The method of claim 1, wherein if the traffic load of the serving cell is below the first threshold and the traffic load of the neighbor cell is also below the second threshold, the target for which the interference cancellation is to be performed by the terminal is determined as null.

4. The method of claim 3, wherein if the traffic load of the serving cell is below the first threshold and the traffic load of the neighbor cell is also below the second threshold, a zero power (ZP) CSI-RS is allocated by the serving cell at a location of a neighbor cell'"'"'s non zero power (NZP) CSI-RS resource.

5. The method of claim 1, wherein if the traffic load of the serving cell is below the first threshold but the traffic load of the neighbor cell is above the second threshold, a neighbor cell'"'"'s PDSCH is determined as the target for which the interference cancellation is to be performed by the terminal.

6. The method of claim 1, wherein if the traffic load of the serving cell is above the first threshold but the traffic load of the neighbor cell is below the second threshold, a neighbor cell'"'"'s NZP CSI-RS is determined as the target for which the interference cancellation is to be performed by the terminal.

7. The method of claim 1, wherein if the traffic load of the serving cell is above the first threshold and the traffic load of the neighbor cell is also above the second threshold, the neighbor cell'"'"'s CSI-RS and PDSCH are determined as the target for which the interference cancellation is to be performed by the terminal.

8. The method of claim 1, wherein if the neighbor cell'"'"'s NZP CSI-RS is determined as the target for which the interference cancellation is to be performed by the terminal, the network assistance information includes one or more of the number of neighbor cell'"'"'s antenna ports, resource configuration information of the CSI-RS, subframe configuration information of the CSI-RS, a scrambling code seed, and information of a power ratio between the PDSCH and the CSI-RS.

9. A serving cell base station for transmitting network assistance information in order to perform interference cancellation of a terminal, the serving cell base station comprising:

a processor configured to determine whether a traffic load of a serving cell is above or below a first threshold, determine whether a traffic load of a neighbor cell is above or below a second threshold, and determine a target for which the interference cancellation is to be performed by the terminal, on the basis of the determined result for the traffic load of the serving cell and the determined result for the traffic load of the neighbor cell; and

a transceiver configured to transmit to the terminal a wireless signal of the network assistance information including information regarding the determined target under the control of the processor.

10. The serving cell base station of claim 9, wherein while determining the interference cancellation target, the processor determines whether the target for which the interference cancellation is to be performed by the terminal is a neighbor cell'"'"'s channel state indicator (CSI)-reference signal (RS) or a physical downlink shared channel (PDSCH).

11. The serving cell base station of claim 9, wherein if the traffic load of the serving cell is below the first threshold and the traffic load of the neighbor cell is also below the second threshold, the processor determines the target for which the interference cancellation is to be performed by the terminal as null.

12. The serving cell base station of claim 11, wherein if the traffic load of the serving cell is below the first threshold and the traffic load of the neighbor cell is also below the second threshold, the processor allocates a zero power (ZP) CSI-RS at a location of a neighbor cell'"'"'s non zero power (NZP) CSI-RS resource.

13. The serving cell base station of claim 9, wherein if the traffic load of the serving cell is below the first threshold but the traffic load of the neighbor cell is above the second threshold, the processor determines a neighbor cell'"'"'s PDSCH as the target for which the interference cancellation is to be performed by the terminal.

14. The serving cell base station of claim 9, wherein if the traffic load of the serving cell is above the first threshold but the traffic load of the neighbor cell is below the second threshold, the processor determines a neighbor cell'"'"'s NZP CSI-RS as the target for which the interference cancellation is to be performed by the terminal.

15. The serving cell base station of claim 9, wherein if the traffic load of the serving cell is above the first threshold and the traffic load of the neighbor cell is also above the second threshold, the processor determines the neighbor cell'"'"'s CSI-RS and PDSCH as the target for which the interference cancellation is to be performed by the terminal.

16. The serving cell base station of claim 9, wherein if the neighbor cell'"'"'s NZP CSI-RS is determined as the target for which the interference cancellation is to be performed by the terminal, the network assistance information includes one or more of the number of neighbor cell'"'"'s antenna ports, resource configuration information of the CSI-RS, subframe configuration information of the CSI-RS, a scrambling code seed, and information of a power ratio between the PDSCH and the CSI-RS.