Block Error Rate Definition
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a quality control measure with regards to how well audio is retained on bit error rate definition a compact disc over time. Block Error Rate (BLER) is symbol error rate definition a ratio of the number of erroneous blocks to the total number of blocks received
Packet Error Rate Definition
on a digital circuit. Block error rate (BLER) is used for W-CDMA performance requirements tests (demodulation tests in multipath conditions, etc.). BLER is measured after channel
Frame Error Rate Definition
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 know the in-sync or out-of-sync indication during radio link monitoring(RLM). BLER (in LTE) = No of erroneous blocks / Total no of Received Blocks. Normal BLER is equal error rate definition 2% for an in-sync condition and 10% for an out-of-sync condition. "Block Error Ratio (BLER) Measurement Description". February 28, 2014. Retrieved 23 December 2015. Retrieved from "https://en.wikipedia.org/w/index.php?title=Block_Error_Rate&oldid=696463547" Categories: Compact discDigital audio Navigation menu Personal tools Not logged inTalkContributionsCreate accountLog in Namespaces Article Talk Variants Views Read Edit View history More Search Navigation Main pageContentsFeatured contentCurrent eventsRandom articleDonate to WikipediaWikipedia store Interaction HelpAbout WikipediaCommunity portalRecent changesContact page Tools What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationWikidata itemCite this page Print/export Create a bookDownload as PDFPrintable version Languages Add links This page was last modified on 23 December 2015, at 09:17. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view
How is a Block Error Ratio Measurement Made? 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
Soft Error Rate Definition
received to the total number of blocks sent. An erroneous block is defined block error rate in lte as a Transport Block, the cyclic redundancy check (CRC) of which is wrong." To perform a block error ratio measurement, lte bler definition you must be on a Radio Bearer Test Mode call. The block error ratio measurement can be performed for both Symmetrical RMCs and Asymmetrical RMCs . For RMCs with a downlink rate of 12.2, https://en.wikipedia.org/wiki/Block_Error_Rate 64 or 144 kbps, the test set sends a block every 20 ms. For RMCs with a downlink rate of 384 kbps, the test set sends a block every 10 ms. The data sent on the downlink is determined by the DL DTCH Data setting. Symmetrical RMCs For Symmetrical RMCs (which use Transparent Mode (TM) RLC entities on the DTCH), the test set measures block error ratio by http://rfmw.em.keysight.com/rfcomms/refdocs/wcdma/wcdma_meas_wblerror_desc.html sending data and CRC bits in the downlink transport blocks to a UE that is configured in loopback mode 2 (UE Loopback Type must be set to Type 2 ). The UE then loops the data bits and CRC bits from the downlink transport blocks into the uplink transport blocks and transmits them in the uplink. The test set then generates a CRC from the data bits received in the uplink transport block and compares this calculated CRC against the CRC received in the uplink transport block (this CRC is the downlink CRC for the downlink transport block, looped back up by the UE). If the CRCs do not match, the transport block is defined to be a "block error." To perform the block error ratio measurement for symmetrical RMCs, Uplink DTCH RMC CRC Presence must be set to Used for Data . This disables the uplink CRC, to allow room for the UE to loop back the downlink CRC for each block (there are an equal number of available bits in the uplink and downlink, if the UE were to transmit an uplink CRC, it would not be able to loop back the downlink CRC). Asymmetrical RMCs For Asymmetrical RM
Follow us! Monday, January 24, 2011 UMTS UTRAN BLOCK ERROR RATE (BLER) MEASUREMENTS Tweet Share Do you like this Article? There are http://trends-in-telecoms.blogspot.com/2011/01/umts-utran-block-error-rate-bler.html three major challenges in performance measurement namely: Defining performance measurements and KPIs, Verifying measurement results, Explaining measurement results. In this article i provide an insight into BLOCK ERROR RATE (BLER) MEASUREMENTS. Block error rate (BLER) is an analysis of transmission errors on the radio interface. Usingformal definitions BLER is a KPI, because it error rate is a formula. It is based on analysis of cyclicredundancy check (CRC) results for radio link control (RLC) transport blocks and computedby defining the relation between the numbers of RLC transport blocks with CRC error indicationand the total number of transmitted transport blocks as expressed in Equation below; BLER is measured separately on error rate definition the uplink and downlink direction, which is mandatory, because in UTRAN frequency division duplex (FDD) mode uplink and downlink data is transmitted using different frequency bands. There is no measurement report in UTRAN that contains uplink BLER values although UL BLER is an important criterion for the radio network controller (RNC) to make handover decisions based on uplink transmission quality. Due to the fact that UL BLER is only computed and used in the RNC internally it also is only available inside RNC software and as a rule is not shown in any performance measurement statistics. Therefore, it is a typical example for performance measurement based on protocol analysis. The UL BLER is especially a very critical parameter to measure user perceived quality of services using RLC transparent mode. UL BLER can also be used to estimate the uplink transmission quality of a call. In this case it is not necessary to differentiate between transport channels that