/* Encode UCI HARQ/ACK bits as described in 5.2.2.6 of 36.212
* Currently only supporting 1-bit HARQ
*/
int srslte_uci_encode_ack(srslte_pusch_cfg_t *cfg, uint8_t acks[2], uint32_t nof_acks,
uint32_t O_cqi, float beta, uint32_t H_prime_total,
srslte_uci_bit_t *ack_bits)
{
if (beta < 0) {
fprintf(stderr, "Error beta is reserved\n");
return -1;
}
uint32_t Qprime = Q_prime_ri_ack(cfg, nof_acks, O_cqi, beta);
srslte_uci_bit_type_t q_encoded_bits[18];
uint32_t nof_encoded_bits = encode_ri_ack(acks, nof_acks, q_encoded_bits, cfg->grant.Qm);
if (nof_encoded_bits > 0) {
for (uint32_t i = 0; i < Qprime; i++) {
uci_ulsch_interleave_ack_gen(i,
cfg->grant.Qm,
H_prime_total,
cfg->nbits.nof_symb,
cfg->cp,
&ack_bits[cfg->grant.Qm * i]);
uci_ulsch_interleave_put(&q_encoded_bits[(i * cfg->grant.Qm) % nof_encoded_bits],
cfg->grant.Qm,
&ack_bits[cfg->grant.Qm * i]);
}
}
return (int) Qprime;
}
/* Encode UCI ACK/RI bits as described in 5.2.2.6 of 36.212
* Currently only supporting 1-bit RI
*/
int srslte_uci_encode_ack_ri(srslte_pusch_cfg_t* cfg,
uint8_t* data,
uint32_t O_ack,
uint32_t O_cqi,
float beta,
uint32_t H_prime_total,
bool input_is_ri,
uint32_t N_bundle,
srslte_uci_bit_t* bits)
{
if (beta < 0) {
ERROR("Error beta is reserved\n");
return -1;
}
uint32_t Q_prime = Q_prime_ri_ack(cfg, O_ack, O_cqi, beta);
uint32_t Q_ack = 0;
uint32_t Qm = srslte_mod_bits_x_symbol(cfg->grant.tb.mod);
if (O_ack < 3) {
uint32_t enc_len = encode_ri_ack(data, O_ack, Qm, bits);
// Repeat bits Q_prime times, remainder bits will be ignored later
while (Q_ack < Q_prime * Qm) {
for (uint32_t j = 0; j < enc_len; j++) {
bits[Q_ack++].type = bits[j].type;
}
}
} else {
Q_ack = encode_ack_long(data, O_ack, Qm, Q_prime, bits);
}
// Generate interleaver positions
if (Q_ack > 0) {
for (uint32_t i = 0; i < Q_prime; i++) {
if (input_is_ri) {
uci_ulsch_interleave_ri_gen(i, Qm, H_prime_total, cfg->grant.nof_symb, &bits[Qm * i]);
} else {
uci_ulsch_interleave_ack_gen(i, Qm, H_prime_total, cfg->grant.nof_symb, &bits[Qm * i]);
}
}
// TDD-bundling scrambling
if (!input_is_ri && N_bundle && O_ack > 0) {
uci_ack_scramble_tdd(bits, O_ack, Q_prime * Qm, N_bundle);
}
}
return (int)Q_prime;
}
/* Decode UCI ACK/RI bits as described in 5.2.2.6 of 36.212
* Currently only supporting 1-bit RI
*/
int srslte_uci_decode_ack_ri(srslte_pusch_cfg_t *cfg, int16_t *q_bits, uint8_t *c_seq,
float beta, uint32_t H_prime_total,
uint32_t O_cqi, srslte_uci_bit_t *ack_ri_bits, uint8_t data[2], uint32_t nof_bits, bool is_ri)
{
int32_t sum[3] = {0, 0, 0};
if (beta < 0) {
fprintf(stderr, "Error beta is reserved\n");
return -1;
}
uint32_t Qprime = Q_prime_ri_ack(cfg, nof_bits, O_cqi, beta);
for (uint32_t i = 0; i < Qprime; i++) {
if (is_ri) {
uci_ulsch_interleave_ri_gen(i,
cfg->grant.Qm,
H_prime_total,
cfg->nbits.nof_symb,
cfg->cp,
&ack_ri_bits[cfg->grant.Qm * i]);
} else {
uci_ulsch_interleave_ack_gen(i,
cfg->grant.Qm,
H_prime_total,
cfg->nbits.nof_symb,
cfg->cp,
&ack_ri_bits[cfg->grant.Qm * i]);
}
if (nof_bits == 2 && (i % 3 == 0) && i > 0) {
decode_ri_ack_2bits(q_bits, &c_seq[0], &ack_ri_bits[cfg->grant.Qm * (i - 3)], cfg->grant.Qm, sum);
} else if (nof_bits == 1) {
sum[0] += (int32_t) decode_ri_ack_1bit(q_bits, c_seq, &ack_ri_bits[cfg->grant.Qm * i]);
}
}
data[0] = (uint8_t) (sum[0] > 0);
if (nof_bits == 2) {
data[1] = (uint8_t) (sum[1] > 0);
}
return (int) Qprime;
}
