Patent ID: 8982706
Filing Date: 2015-03-17
Classification: H04B

Abstract:
1. A method for conducting communication at a Relay Node (RN) in a mobile communication system in which communication is conducted between a Base Station (BS) and the RN via a first interface and between the RN and a User Equipment (UE) via a second interface, the method comprising: receiving a downlink transmission indication from the BS on a downlink of the first interface; transmitting a response signal to the BS indicating whether a first signal is to be received from the BS on the downlink of the first interface in a first time area T1 on an uplink of the first interface; and receiving the first signal from the BS on the downlink of the first interface in T1 if the response signal is an ACKnowledgment (ACK) signal, wherein the downlink of the first interface and a downlink of the second interface are in a same frequency band and signal reception on the downlink of the first interface and signal transmission on the downlink of the second interface are not performed simultaneously, wherein a second time area T2 is preliminarily allocated to the RN for signal reception from the BS on the downlink of the first interface, and T1 is a time area other than T2 if the ACK signal is transmitted as the response signal for the downlink transmission indication, and wherein T1 is allocated to the RN by the BS through a downlink transmission indication indicating a time point for receiving the first signal for a synchronous Hybrid Automatic Repeat reQuest (HARQ) operation such that the RN receives the first signal for the synchronous HARQ operation from the BS in T1 on the downlink of the first interface if a time point, at which the first signal is received on the downlink of the first interface for the synchronous HARQ operation of a specific packet transmission between the BS and the RN, is different from T2.