Patent ID: 9137790
Filing Date: 2015-09-15
Classification: H04L,H04W

Abstract:
1. A method for performing hybrid automatic repeat request (HARQ), adapted to a base station in a wireless communication system, the method comprising: allocating a wireless resource by using the base station, and determining whether to perform a device-to-device (D2D) communication; when the D2D communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device by using the base station, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message; receiving a HARQ feedback packet from the second mobile device by using the base station to determine whether the data packet is successfully transmitted; and when the HARQ feedback packet is a negative acknowledgement (NACK), transmitting a second resource allocation message to the first mobile device and the second mobile device by using the base station, wherein when the HARQ feedback packet is the NACK and an asynchronous HARQ retransmission is performed, the second resource allocation message is simultaneously transmitted to the first mobile device and the second mobile device by using the base station, so that the first mobile device retransmits the data packet to the second mobile device according to the second resource allocation message.