METHOD FOR TRANSMITTING SUPPORT INFORMATION FOR REMOVING INTERFERENCE OF TERMINAL, AND SERVING CELL BASE STATION

• US 20150372779A1
• 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: LIM, Suhwan, LEE, Sangwook, HWANG, Jinyup, JUNG, Manyoung, YANG, Yoonoh
• Granted Patent: US 10,084,564 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 56/003 Arrangements to increase tolerance to errors in transmission or reception timing

Abstract

One embodiment of the present specification discloses a method by which a serving cell transmits support information for removing interference of a terminal. The method comprises: a step for determining, by the serving cell, a downlink timing offset with neighboring interference cells; and a step for to determining, by the serving cell, a channel corresponding to an interference removal target among neighboring interference cells according to the timing offset. Here, the channel to have interference removed can be the channel interfering in a control channel for the serving cell according to the timing offset. The method further includes a step for enabling the serving cell to generate the interference removal support information on the determined channel and transmit the generated information to a terminal.

Claims

1. A method for transmitting assistance information for interference cancellation for a user equipment, the method comprising:

determining, by a serving cell, a downlink timing offset with a neighbor interfering cell;

determining, by the serving cell, a channel which is to be a target of interference cancellation among channels of the neighbor interfering cell according to the timing offset, wherein the channel which is the target of interference cancellation is a channel that exerts interference to a control channel of the serving cell; and

generating, by the serving cell, interference cancellation assistance information for the determined channel, and transmit the interference cancellation assistance information to the user equipment.

2. The method of claim 1, wherein the control channel includes at least one of a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH) and a Physical Hybrid-ARQ Indicator Channel (PHICH).

3. The method of claim 1, wherein the determining the offset includes exchanging, performed by the serving cell, information on the downlink timing offset with the neighbor interfering cell.

4. The method of claim 1, wherein the generating the interference cancellation assistance information includes:

acquiring, by the serving cell, information on the determined channel from the neighbor interfering cell; and

generating the interference cancellation assistance information based on the acquired information.

5. The method of claim 1, wherein if the timing offset is zero or a unit of subframe, the target of interference cancellation the control channel of the neighbor interfering cell that exerts interference to the control channel of the serving cell.

6. The method of claim 1, wherein if the timing offset corresponds to five to six symbols and the control channel of the serving cell is transmitted on two symbols, the target of interference cancellation is at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), an extended Physical Downlink Control Channel (e-PDCCH) and a Physical Downlink Shared Channel (PDSCH) of the neighbor interfering cell that exerts interference to the control channel of the serving cell.

7. The method of claim 1, wherein if the timing offset corresponds to seven to ten symbols and the control channel of the serving cell is transmitted on two symbols, the target of interference cancellation is at least one of a PBCH, an e-PDCCH and a PDSCH of the neighbor interfering cell that exerts interference to the control channel of the serving cell.

8. The method of claim 1, wherein the interference cancellation assistance information includes information required in common regardless of the sort of channel which is a target of interference cancellation and information dedicated to the channel which is a target of interference cancellation.

9. The method of claim 1, wherein the information required in common of the interference cancellation assistance information includes a number of transmission antenna of the neighbor interfering cell that causes interference and an E-UTRA Absolute Radio Frequency Channel Number (EARFCN).

10. The method of claim 9, wherein the information required in common of the interference cancellation assistance information includes at least one of system bandwidth information, scrambling code seed, Transmission mode, System Frame Number (SFN) offset and timing offset.

11. The method of claim 8, wherein if the target of interference cancellation is the control channel of the neighbor interfering cell, the information dedicated to the channel includes information on common search space for a neighbor user equipment that belongs to the neighbor interfering cell.

12. A serving base station for transmitting assistance information for interference cancellation for a user equipment, the serving base station comprising:

a processor configured to determine a downlink timing offset with a neighbor interfering cell and determine a channel which is to be a target of interference cancellation among channels of the neighbor interfering cell according to the timing offset, wherein the channel which is a target of interference cancellation is a channel that exerts interference to a control channel of the serving cell; and

an RF unit configured to transmit the interference cancellation assistance information for the determined channel to the user equipment.

13. The serving base station of claim 12, wherein the control channel includes at least one of a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH) and a Physical Hybrid-ARQ Indicator Channel (PHICH).

14. The serving base station of claim 12, wherein the processor exchanges information on the downlink timing offset with the neighbor interfering cell for the offset determination.

15. The serving base station of claim 12, wherein the processor acquires information on the determined channel from the neighbor interfering cell and generates the interference cancellation assistance information based on the acquired information.