How BLER is calculated in LTE?

How BLER is calculated 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 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 causes BLER in LTE?

The BLER should be smaller or equal than 10%. If the value is larger, then, there is an indication of bad RF environment. b) Typical causes of bad BLER are downlink interference, bad coverage (holes in the network, etc.)

What is 5G BLER?

Within the physical and link layer field in 5G, block error rate (BLER) modelling is easily identified as a candidate for ML application [4]. A transport block in 5G [5] is a set of bits jointly coded by a low parity channel code (LDPC) after appending a cyclic redundancy check (CRC).

What is LTE frame structure?

There are two types of frame structure in the LTE standard, Type 1 and Type 2. Type 1 uses Frequency Division Duplexing (uplink and downlink separated by frequency), and TDD. uses Time Division Duplexing (uplink and downlink separated in time).

What is LTE Sinr?

SINR (Signal to Interference & Noise Ratio) measures signal quality: the strength of the wanted signal compared to the unwanted interference and noise.

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.

How do you calculate block error rate?

When the UE is operating in Type 1, RLC AM loopback type, the block error ratio is calculated by the ratio of number of UE retransmission requests and the total number of blocks sent to the UE. In AM the UE indicates missing protocol units (=transport blocks) in the STATUS PDU message.

What is rank indicator in LTE?

The rank indication or the RI in LTE is one of the control information that a UE will report to eNodeB on either PUCCH or PUSCH based on uplink scheduling. If the eNodeB is configured with 2 transmit antennas on downlink then the number of bits reported in RI will be one and if its 4 then number of RI bits will be 2.

How can I improve my DL throughput in LTE?

The easiest way is to give a higher priority to L1800 and that will shift most of the UEs in L1800 coverage away from L800. This will ensure better CQI for users and thus a better throughput. Another way would be to keep them on same priority and provide a frequency offset to move the users to L1800.

What is target Bler?

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. “Error” is unavoidable in wireless communication due to several reasons.

What is the length of a frame in LTE?

10 ms
The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE Subframes then consist of two slots – in other words there are ten LTE subframes within a frame.

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 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

How is BLER performance limited by the smallest TB size?

BLER performance is limited by the smallest TB size ◊ Coding gain is less Segmentation block ensures that a TB is divided into equal size code-blocks ◊ E.g., TB size of 6224 is segmented into two code block of sizes 3136

What should The BLER target be on a radio?

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.