ENHANCEMENT FOR HARQ WITH CHANNEL REPETITIONS

摘要

These disclosed embodiments describe a method for a device, particularly a low-complexity MTC device, to enhance coverage by optimizing HARQ operation with repetitions. For downlink data transmission, a device receives the DL (normal or primary) grant from BS to determine reception of the initial data transmission or full-adaptive retransmission. A device may receive a secondary DL grant for receiving the data with partial-adaptive retransmission. For uplink data transmission, a device receives the UL normal (or primary) grant to perform initial data transmission or full-adaptive retransmission. The device may receive a secondary UL grant for retransmission according to the combined information from the secondary UL grant and the latest UL normal grant. The secondary grant can be a truncated normal grant for partial-adaptive HARQ retransmission with less control information and resource consumption, whereas the UL/DL normal (or primary) grant is mainly applied to support initial HARQ transmission and full-adaptive HARQ retransmission.