RLC Re-Transmission Buffer Priority?

Question

I have a doubt. When receiving a negative acknowledgement for an AMD PDU or a portion of an AMD PDU by a STATUS PDU from its peer AM RLC entity.

In what basis MAC will provide grant to TX RLC, whether it will provide grant to remaining SDUs stored in the transmission buffer or it will give grant to Re-transmitting AMD PDU

To which buffer it will give high priority whether to Transmission Buffer or Re-Transmission buffer

Answer 1

HI,

In MAC first priority will go to status PDU of RLC and Retx of RLC then remaining grant will go to RLC new TX.

Even if you give new Tx grant to RLC, RLC wont do new transmission if RLC has Retx data. RLC will send re tx first then followed by new Tx.

Happy Learning :)