# Block Error Rate

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{{Short description|Metric used in LTE networks}}
{{Single source|date=January 2024}}
'''Block Error Rate''' (BLER) is a ratio of the number of erroneous blocks to the total number of blocks transmitted on a digital circuit.

It is used in [measuring the error rate](/source/Optical_disc) when extracting data frames from a [Compact Disc](/source/Compact_Disc) (CD). The BLER measurement is often used as a quality control measure with regard to how well audio is retained on a compact disc over time.

BLER is also used for [W-CDMA](/source/Universal_Mobile_Telecommunications_System) performance requirements tests (demodulation tests in multipath conditions, etc.). BLER is measured after channel de-interleaving and decoding by evaluating the [Cyclic Redundancy Check (CRC)](/source/Cyclic_Redundancy_Check) on each transport block.

Block Error Rate (BLER) is used in [LTE/4G](/source/LTE_(telecommunication)) technology to determine the in-sync or out-of-sync indication during radio link monitoring (RLM). Normal BLER is 2% for an in-sync condition and 10% for an out-of-sync condition.<ref>{{cite web
| url = http://rfmw.em.keysight.com/rfcomms/refdocs/wcdma/wcdma_meas_wblerror_desc.html
| title = Block Error Ratio (BLER) Measurement Description
| access-date=23 December 2015
| date = February 28, 2014
}}</ref>

==References==
{{reflist}}

Category:Compact disc
Category:Audio software

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Adapted from the Wikipedia article [Block Error Rate](https://en.wikipedia.org/wiki/Block_Error_Rate) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Block_Error_Rate?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.