Patent ID: 8780820
Filing Date: 2014-07-15
Classification: H04L

Abstract:
1. A method of transmitting data using hybrid automatic repeat request (HARQ), the method comprising: transmitting, by a user equipment (UE), an uplink data to a base station (BS); receiving, by the UE, a HARQ feedback, which is an ACK signal or a NACK signal, corresponding to the uplink data from the BS; when the UE receives the ACK signal, determining whether the UE detects a physical downlink control channel (PDCCH) associated with UE-identification (UE-ID); and when the UE does not detect the PDCCH associated with the UE-ID, keeping, by the UE, the uplink data in a HARQ buffer after receiving the ACK signal until an uplink grant is received from the BS, and retransmitting, by the UE, the uplink data after receiving the uplink grant from the BS.