name: CRC
full_form: Cyclic Redundancy Check
context: on TFCI transmission by UE rather than on blind transport format detection by Node-B receiver. Early decoding increases the overall probability of false CRC pass, because there are multiple decoding attempts made, and a false CRC pass could happen on any of them, further false CRC passes are also more likely at earlier decoding attempts where there is less information available to the decoder. To combat this issue, a larger CRC size can be used. Currently AMR voice over DCH usually uses 12 bit CRC for DTCH and 16 bit CRC for DCCH. The 16 bit CRC could also be used for DTCH in order to support FET, on both the uplink and downlink. Currently AMR voice frames consist of separate classes of bits (class A,B,C for AMR12.2K and class A,B for AMR5.9K), which are separately encoded and carried on separate transport channels, and CRC protection is used only for the class-A bits. If the same approach is used in conjunction with FET, the BER of the class B and C bits may be higher than that in
description: Cyclic Redundancy Check (CRC) is an error-detecting code used to detect errors in digital data. In the context of 3GPP TS 25.702, CRC is utilized for protecting transport channels and ensuring reliable transmission of data over wireless networks.
explanation: The text describes CRC as an error-detecting code used for reliable data transmission in wireless networks. This clearly positions it as a technological concept.
section_title: 4.2.1.1.1	DCCH indicator bit, choice of CRC length and transport channels
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