name: RFC
full_form: RAB sub Flow Combination
context: PUCCH format 1, 1a, 1b, 3, 4 or 5 when there is one serving cell configured, the shortened PUCCH format shall be used where the last SC-FDMA symbol in the second slot of a subframe shall be left empty. In case of guard period for narrowband or wideband retuning for BL/CE UEs, if an SC-FDMA symbol is left empty due to guard period, the SC-FDMA symbol shall be counted in the PUCCH mapping but not used for transmission of the PUCCH. The SC-FDMA symbol affected by the guard period can be the first SC-FDMA symbol in the first slot of a subframe and/or the last SC-FDMA symbol in the second slot of a subframe. For BL/CE UEs communicating over NTN, for PUCCH transmission, for frame structure type 1, after a transmission duration of time units (which may include subframes that are not BL/CE UL subframes), a transmission gap of time units shall be counted for the PUCCH resource mapping but not used for transmission of the PUCCH, according to the single UE capability
description: IETF RFCs (Requests for Comments) are specifications published by the Internet Engineering Task Force (IETF). These documents provide standards and guidelines for various internet protocols.
explanation: The context mentions multiple IETF RFCs listed as references in 3GPP TS 25.426. This indicates that 'RFC' in this case refers to the specifications published by the IETF, not a different telecommunications concept.
section_title: 2	References
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