What causes BLER in LTE?
b) Typical causes of bad BLER are downlink interference, bad coverage (holes in the network, etc.)
How do you check BLER in LTE?
BLER is measured after channel de-interleaving and decoding by evaluating the Cyclic Redundancy Check (CRC) on each transport block. Block Error Rate (BLER) is used in LTE/4G technology to determine the in-sync or out-of-sync indication during radio link monitoring (RLM).
What is target BLER LTE?
In radio side, typical BLER target is 10% which means the receiver should receive at least 90% successful transmission. If the target is less than 10% then more re-transmission might be required and cause radio resource consuming.
How can spectral efficiency be improved in LTE?
The spectral efficiency can be improved by radio resource management techniques such as efficient fixed or dynamic channel allocation, power control, link adaptation and diversity schemes. A combined fairness measure and system spectral efficiency measure is the fairly shared spectral efficiency.
What is residual Bler?
Residual BLER: If the UE is unable to decode the data even after retransmission, the UE will send another NACK and the eNB will have to retransmit again. However, there is a limit to these retransmissions and usually they are configurable.
What is the difference between BER and BLER?
BER stands for Bit Error Rate measurement. It is the ratio of number of bits received in error at the receiver to the total number of bits transmitted from transmitter. BLER is the ratio of received erroneous blocks to the total number of data blocks transmitted.
What is residual BLER?
What is a good CQI in LTE?
In HSDPA, the CQI value ranges from 0 ~ 30. 30 indicates the best channel quality and 0,1 indicates the poorest channel quality. Depending which value UE reports, network transmit data with different transport block size.
What is the function of Pa and Pb in LTE?
The 3GPP has defined two parameters PA and PB that control downlink power allocation. PA represents the power of the reference signal when compared with OFDM symbol A and PB represents the power of the reference elements of OFDM symbol B as compared with OFDM symbol A.
What is BLER in UMTS?
3GPP TS 34.121, F. 6.1. 1 defines block error ratio (BLER) as follows: “A Block Error Ratio is defined as the ratio of the number of erroneous blocks received to the total number of blocks sent. An erroneous block is defined as a Transport Block, the cyclic redundancy check (CRC) of which is wrong.”
What does BLER stand for in LTE terms?
BLER (in LTE) = Number of erroneous blocks / total number of received blocks The calculation is based on CRC (Cyclic Redundancy Check) evaluation which is used for inspection the transport blocks at receiver side.
How is the block error rate calculated in LTE?
“Block Error Rate” or BLER is a measurement type of quality in telecommunication. Simple calculation of the measurement: BLER (in LTE) = Number of erroneous blocks / total number of received blocks The calculation is based on CRC (Cyclic Redundancy Check) evaluation which is used for inspection the transport blocks at receiver side.
What should The BLER be for a radio link?
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).
What are the different types of BLER’s?
In many radio measurement tools, we can see two kinds of BLER: iBLER and rBLER. iBLER: Initial Block Error Rate. The ratio of data blocks with initial transmission errors to all initial transmission data blocks. rBLER: Residual Block Error Rate.