US 9,179,468 B2 · Method for avoiding inter-cell interference in wireless access system

Abstract

According to the disclosure of the present invention, provided is a method for operating a relay node (RN) to avoid an inter-cell interference (ICI) in a wireless access system. The method includes: overhearing the downlink signal transmitted by a plurality of base stations to terminals within the coverage area of each base station in an nth subframe; decoding the overheard downlink signal from an n+1th subframe to an n+3th subframe and sharing the RN through the plurality of base stations; overhearing the reply to the downlink signal transmitted by the terminals to each base station in an n+4th subframe; reallocating a resource block allocated to the terminals in the nth subframe if there is at least one negative reply NACK in the replies to the downlink signal transmitted by the terminals; and transmitting control information representing the reallocated resource block to each base station.

Claims15

Dependent claims

A method for operating a relay node (RN) to avoid inter-cell interference (ICI) in a wireless access system, the method comprising:

overhearing, by the RN, a downlink signal transmitted by a plurality of base stations to terminals within a coverage area of each base station in an nth sub-frame;
decoding the overheard downlink signal from an n+1th sub-frame to an n+3th sub-frame and sharing the RN through the plurality of base stations,
wherein n is an integer greater than 0;
overhearing, by the RN, a response to the downlink signal transmitted by the terminals to each base station in an n+4th sub-frame;
reallocating, by the RN, a resource block allocated to the terminals in the nth sub-frame if there is at least one negative acknowledgement (NACK) in the responses to the downlink signal transmitted by the terminals,
wherein the response is a positive acknowledgement (ACK) or a NACK;
generating, by the RN, control information representing the reallocated resource block;
transmitting, by the RN, the control information to each base station;
and
transmitting, by the RN in an n+8th sub-frame, the downlink signal transmitted to the terminals in the nth sub-frame, in accordance with the control information.

7 more elements

A method for operating a base station (BS) to avoid inter-cell interference (ICI) in a wireless access system, the method comprising:

transmitting, by the BS, a downlink signal to a terminal within a coverage area of the base station in an nth sub-frame,
wherein n is an integer greater than 0;
receiving, by the BS, a response to the downlink signal from the terminal in an n+4th sub-frame, wherein the response is a positive acknowledgement (ACK) or a negative acknowledgement (NACK);
receiving, by the BS from a relay node (RN), control information representing that a procedure of reallocating a resource to the terminal transmitting the NACK to the downlink signal is required;
reallocating a resource block allocated in the nth sub-frame to the terminal transmitting the NACK to the downlink signal based on the received control information;
and
retransmitting, in an n+8th sub-frame, the downlink signal transmitted to the terminal in the nth sub-frame, according to the reallocated resource block,
wherein the RN is configured to overhear the response to the downlink signal transmitted by the terminal and generate the control information if the response is the NACK.

5 more elements

Dependencies are inferred from the claim text.

Method for avoiding inter-cell interference in wireless access system

Life of this patent

Method for avoiding inter-cell interference in wireless access system

Life of this patent

Abstract

Claims15