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Add functions to calculate M_bit for PUCCH format 2/3/4

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Add functions to calculate PUCCH format 2/3/4 rate matching output sequence length (M_bit),
according to 3GPP TS 38.212 Table 6.3.1.4-1.
This commit is contained in:
alexjiao
2025-09-30 00:23:00 +08:00
parent b69b65ba66
commit ac76c6e27a
1 changed files with 46 additions and 21 deletions
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openair1/PHY/NR_UE_TRANSPORT/pucch_nr.c
+46 -21
View File
@@ -485,6 +485,45 @@ void nr_generate_pucch1(const PHY_VARS_NR_UE *ue,
}
}
// Calculate number of DMRS symbols for PUCCH formats 3 and 4
static uint8_t nr_pucch_get_dmrs_symbols(uint8_t nrofSymbols, uint8_t add_dmrs)
{
if (nrofSymbols == 4) {
return 1;
} else if (nrofSymbols > 4 && nrofSymbols <= 9) {
return 2;
} else if (nrofSymbols > 9) {
return (add_dmrs == 0) ? 2 : 4;
}
return 0;
}
// Calculate PUCCH format 2/3/4 rate matching output sequence length according to TS 38.212 Table 6.3.1.4-1
static uint16_t nr_pucch_output_sequence_length(uint8_t format_type,
uint8_t nrofSymbols,
uint16_t nrofPRB,
uint8_t n_SF_PUCCH_s,
uint8_t is_pi_over_2_bpsk_enabled,
uint8_t add_dmrs)
{
uint16_t M_bit = 0;
if (format_type == 2) {
M_bit = 16 * nrofSymbols * nrofPRB;
} else if (format_type == 3) {
uint16_t E_init = (is_pi_over_2_bpsk_enabled == 0) ? 24 : 12;
uint8_t num_dmrs_symbols = nr_pucch_get_dmrs_symbols(nrofSymbols, add_dmrs);
M_bit = E_init * (nrofSymbols - num_dmrs_symbols) * nrofPRB / n_SF_PUCCH_s;
} else if (format_type == 4) {
nrofPRB = 1;
uint16_t E_init = (is_pi_over_2_bpsk_enabled == 0) ? 24 : 12;
uint8_t num_dmrs_symbols = nr_pucch_get_dmrs_symbols(nrofSymbols, add_dmrs);
M_bit = E_init * (nrofSymbols - num_dmrs_symbols) * nrofPRB / n_SF_PUCCH_s;
}
return M_bit;
}
static inline void nr_pucch2_3_4_scrambling(uint16_t M_bit, uint16_t rnti, uint16_t n_id, uint64_t *B64, uint8_t *btilde)
{
// c_init=nRNTI*2^15+n_id according to TS 38.211 Subclause 6.3.2.6.1
@@ -726,7 +765,7 @@ void nr_generate_pucch2(const PHY_VARS_NR_UE *ue,
// b is the block of bits transmitted on the physical channel after payload coding
uint64_t b[16] = {0}; // limit to 1024-bit encoded length
// M_bit is the number of bits of block b (payload after encoding)
uint16_t M_bit = 16 * pucch_pdu->nr_of_symbols * pucch_pdu->prb_size;
uint16_t M_bit = nr_pucch_output_sequence_length(pucch_pdu->format_type, pucch_pdu->nr_of_symbols, pucch_pdu->prb_size, 0, 0, 0);
nr_uci_encoding(pucch_pdu->payload, pucch_pdu->n_bit, pucch_pdu->prb_size, false, M_bit, 0, &b[0]);
/*
* Implementing TS 38.211
@@ -938,26 +977,12 @@ void nr_generate_pucch3_4(const PHY_VARS_NR_UE *ue,
uint16_t startingPRB = pucch_pdu->prb_start + pucch_pdu->bwp_start;
uint8_t add_dmrs = pucch_pdu->add_dmrs_flag;
uint16_t E_init = (is_pi_over_2_bpsk_enabled == 0) ? 24 : 12;
if (pucch_pdu->format_type == 3) {
if (nrofSymbols == 4) {
M_bit = (intraSlotFrequencyHopping == 0) ? (E_init * (nrofSymbols - 1) * nrofPRB) : (E_init * (nrofSymbols - 1) * nrofPRB);
} else if (nrofSymbols > 4) {
M_bit = E_init * (nrofSymbols - 2) * nrofPRB;
} else if (nrofSymbols > 9) {
M_bit = (add_dmrs == 0) ? (E_init * (nrofSymbols - 2) * nrofPRB) : (E_init * (nrofSymbols - 4) * nrofPRB);
}
} else if (pucch_pdu->format_type == 4) {
if (nrofSymbols == 4) {
M_bit = (intraSlotFrequencyHopping == 0) ? (E_init * (nrofSymbols - 1) / n_SF_PUCCH_s)
: (E_init * (nrofSymbols - 1) / n_SF_PUCCH_s);
} else if (nrofSymbols > 4) {
M_bit = E_init * (nrofSymbols - 2) / n_SF_PUCCH_s;
} else if (nrofSymbols > 9) {
M_bit = (add_dmrs == 0) ? (E_init * (nrofSymbols - 2) / n_SF_PUCCH_s) : (E_init * (nrofSymbols - 4) / n_SF_PUCCH_s);
}
}
M_bit = nr_pucch_output_sequence_length(pucch_pdu->format_type,
nrofSymbols,
nrofPRB,
n_SF_PUCCH_s,
is_pi_over_2_bpsk_enabled,
add_dmrs);
nr_uci_encoding(pucch_pdu->payload, pucch_pdu->n_bit, nrofPRB, false, M_bit, 0, b);
/*