According to this disclosure, CSI and/or a plurality of ACKs related to a group of DL data transmissions may be buffered at the UE as a GACK until a DCI trigger is received from the eNB. Once the trigger is received, the UE may transmit CSI and/or GACK to the eNB. In this way, HARQ feedback and/or CSI may be reliably communicated while reducing payload. In one aspect of the disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus sends data transmissions associated with the first plurality of downlink subframes to the UE. In an aspect, the apparatus increments a counter for each data transmission sent to the UE. In a further aspect, the apparatus transmits to the UE a first trigger for a first GACK if the counter is greater than or equal to a threshold.
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