drx-HARQ-RTT-TimerDL - the minimum duration before a DL assignment for HARQ retransmission is expected by the MAC entity.
drx-HARQ-RTT-TimerUL- the minimum duration before a UL HARQ retransmission grant is expected by the MAC entity.
These two timer used in 5G to controls DRX operation . RTT -HARQ process transmission.