Please explain BLER (IBLER & RBLER) Procedure in LTE?

Question

Cloud any one please explain to me clearly the BLER (IBLER & RBLER) Procedure in LTE?

Answer 1

The Block Error Rate (BLER) is a measure of how successful a data transmission is over the air at the Physical/MAC layer level. If a transport block is successful decoded (the CRC calculated by the receiver matches the CRC sent in the block, then the transmission is successful. The target BLER for the radio link is typically set to 10% (meaning that the transmission must be sent in such a way as to achieve a 90% success rate on average).

If the transmission fails, then the receiver indicates this with a HARQ NAK (negative acknowledgement); the sender can then send additional information (e.g. error correction bits) to help the receiver decode the original transmission (a so-called HARQ retransmission).

iBLER is initial BLER where as rBLER is residual BLER after retransmission.

Comments

Dear Salil,
Thanks for your clear explanation.
but what is the max. Attempts number to stop the RBLER procedure??
i think it should stop after a fixed Numbers of Attempts.

---

typically two re-transmissions are done by HARQ but this is configurable. If the data can't be decoded after max. HARQ re-transmission attempts, it has to be recovered by RLC ARQ.

---

Is this range applicable for DL as well as UL as >10%

Answer 2

what percentage of area should have IBLER <10%.

Comments

Would you like to ask a fresh query, as it is old thread?

Answer 3

inital BLER is too much high than Residual BLER?