/* Initializes the Pseudo-Random sequence to the provided cell id. Can be called multiple times without allocating new
* memory
*/
int srslte_ra_ul_pusch_hopping_init(srslte_ra_ul_pusch_hopping_t* q, srslte_cell_t cell)
{
int ret = SRSLTE_ERROR_INVALID_INPUTS;
if (q) {
if (cell.id != q->cell.id || !q->initialized) {
q->cell = cell;
q->initialized = true;
/* Precompute sequence for type2 frequency hopping */
if (srslte_sequence_LTE_pr(&q->seq_type2_fo, 210, q->cell.id)) {
ERROR("Error initiating type2 frequency hopping sequence\n");
return SRSLTE_ERROR;
}
ret = SRSLTE_SUCCESS;
}
}
return ret;
}
/** Computes sequence-group pattern f_gh according to 5.5.1.3 of 36.211 */
int srslte_group_hopping_f_gh(uint32_t f_gh[SRSLTE_NSLOTS_X_FRAME], uint32_t cell_id) {
srslte_sequence_t seq;
bzero(&seq, sizeof(srslte_sequence_t));
if (srslte_sequence_LTE_pr(&seq, 160, cell_id / 30)) {
return SRSLTE_ERROR;
}
for (uint32_t ns=0;ns<SRSLTE_NSLOTS_X_FRAME;ns++) {
f_gh[ns] = 0;
for (int i = 0; i < 8; i++) {
f_gh[ns] += (((uint32_t) seq.c[8 * ns + i]) << i);
}
}
srslte_sequence_free(&seq);
return SRSLTE_SUCCESS;
}
/* Generates n_cs_cell according to Sec 5.4 of 36.211 */
int srslte_pucch_n_cs_cell(srslte_cell_t cell, uint32_t n_cs_cell[SRSLTE_NSLOTS_X_FRAME][SRSLTE_CP_NORM_NSYMB])
{
srslte_sequence_t seq;
bzero(&seq, sizeof(srslte_sequence_t));
srslte_sequence_LTE_pr(&seq, 8*SRSLTE_CP_NSYMB(cell.cp)*SRSLTE_NSLOTS_X_FRAME, cell.id);
for (uint32_t ns=0;ns<SRSLTE_NSLOTS_X_FRAME;ns++) {
for (uint32_t l=0;l<SRSLTE_CP_NSYMB(cell.cp);l++) {
n_cs_cell[ns][l] = 0;
for (uint32_t i=0;i<8;i++) {
n_cs_cell[ns][l] += seq.c[8*SRSLTE_CP_NSYMB(cell.cp)*ns+8*l+i]<<i;
}
}
}
srslte_sequence_free(&seq);
return SRSLTE_SUCCESS;
}
/**
* 36.211 5.4.2
*/
int srslte_sequence_pucch(srslte_sequence_t *seq, uint16_t rnti, uint32_t nslot, uint32_t cell_id) {
bzero(seq, sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, 20, ((((nslot/2)+1)*(2*cell_id+1))<<16)+rnti);
}
/**
* 36.211 5.3.1
*/
int srslte_sequence_pusch(srslte_sequence_t *seq, uint16_t rnti, uint32_t nslot, uint32_t cell_id, uint32_t len) {
bzero(seq, sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, len, (rnti<<14) + ((nslot/2)<<9) + cell_id);
}
/**
* 36.211 6.8.2
*/
int srslte_sequence_pdcch(srslte_sequence_t *seq, uint32_t nslot, uint32_t cell_id, uint32_t len) {
bzero(seq, sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, len, (nslot/2) * 512 + cell_id);
}
/**
* 36.211 6.9.1
*/
int srslte_sequence_phich(srslte_sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
bzero(seq, sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, 12, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
}
/**
* 36.211 6.6.1
*/
int srslte_sequence_pbch(srslte_sequence_t *seq, srslte_cp_t cp, uint32_t cell_id) {
bzero(seq, sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, SRSLTE_CP_ISNORM(cp)?1920:1728, cell_id);
}
int srslte_sequence_pmch(srslte_sequence_t *seq, uint32_t nslot, uint32_t mbsfn_id , uint32_t len){
bzero(seq,sizeof(srslte_sequence_t));
return srslte_sequence_LTE_pr(seq, len, (((nslot/2)<<9) + mbsfn_id));
}
/**
* 36.211 6.3.1
*/
int srslte_sequence_pdsch(srslte_sequence_t *seq, uint16_t rnti, int q, uint32_t nslot, uint32_t cell_id, uint32_t len) {
return srslte_sequence_LTE_pr(seq, len, (rnti<<14) + (q<<13) + ((nslot/2)<<9) + cell_id);
}
/**
* 36.211 6.7.1
*/
int srslte_sequence_pcfich(srslte_sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
return srslte_sequence_LTE_pr(seq, 32, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
}