Section: 5.4.2 PUCCH formats 2, 2a and 2b
Content: The block of bits shall be scrambled with a UE-specific scrambling sequence, resulting in a block of scrambled bits according to where the scrambling sequence is given by clause 7.2. The scrambling sequence generator shall be initialised with at the start of each subframe where is C-RNTI. The block of scrambled bits shall be QPSK modulated as described in clause 7.1, resulting in a block of complex-valued modulation symbols . Each complex-valued symbol shall be multiplied with a cyclically shifted length sequence for each of the antenna ports used for PUCCH transmission according to where is defined by clause 5.5.1 with and . Resources used for transmission of PUCCH formats 2/2a/2b are identified by a resource index from which the cyclic shift is determined according to where and for and by for . For PUCCH formats 2a and 2b, supported for normal cyclic prefix only, the bit(s) shall be modulated as described in Table 5.4.2-1 resulting in a single modulation symbol used in the generation of the reference-signal for PUCCH format 2a and 2b as described in clause 5.5.2.2.1. Table 5.4.2-1: Modulation symbol for PUCCH formats 2a and 2b