One embodiment is directed to a method comprising receiving a grant message for channel resource allocation from a scheduling node, receiving data transmission based on the allocated channel resource from the scheduling node, and receiving a confirmation message from the scheduling node that indicates which channel resource was actually used for the data transmission. Another embodiment is directed to a method comprising receiving a grant message for channel resource allocation, receiving data transmission based on the allocated channel resource, decoding the received data, if the received data cannot be decoded correctly, sending an indication of packet failure, receiving a retransmission grant message, receiving a retransmitted data, and based on the retransmission grant message, performing HARQ combining.