Methods, systems, and devices related to related to digital wireless communication, and more specifically, to techniques related to transmitting data and feedback data between network elements is disclosed. In one exemplary aspect, a method for wireless communication includes transmitting data from a first network element to a second network element. The method also includes receiving, at the first network element, feedback data from the second network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal. The method also includes retransmitting at least a portion of the data from the first network element based on the feedback data.