Method for controlling timing of backhaul link and relay system for the same

摘要

Embodiments for providing a method of controlling timing of a downlink backhaul sub-frame and a relay system for the same are disclosed. According to the present invention, a control signal is transmitted to user equipment during a control symbol period of a sub-frame and a data starting point of the sub-frame is set after a time (SG1) for switching from a transmission mode to a reception mode to receive backhaul data of a base station during a backhaul symbol period. Timing of a transmission sub-frame and a reception sub-frame is delayed by the SG1. A sum of a length of the SG1 and a time (SG2) for switching from the reception mode to the transmission mode is shorter than a length of a symbol having a normal CP. At this time, the lengths of the SG1 and the SG2 are identical to each other or the length of the SG2 is shorter than the length of the SG1. In such a case, the backhaul data are received up to a last symbol period of backhaul symbols of the reception sub-frame.

主权项

1. A backhaul timing control method, comprising:
delaying, at a relay, timing of a transmission sub-frame by a predetermined time over timing of a reception sub-frame; transmitting, at a relay, a control signal to a user equipment during a control symbol period of a sub-frame; and setting, at the relay, a data starting point of the sub-frame after a switching gap (SG1) which is a time for switching from a transmission mode to a reception mode to receive backhaul data of a base station during backhaul symbol periods, wherein a sum of lengths of the SG1 and a switching gap (SG2), which is a time for switching the reception mode to the transmission mode, is shorter than a length of a symbol (Ln) having a normal cyclic prefix (CP), and wherein the length of the SG2 is identical to or shorter than the length of the SG1 and each length of the SG1 and the SG2 is longer than a length of the CP.