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Fix prach K,kbar for mu 0

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This commit is contained in:
Sakthivel Velumani
2025-02-25 11:58:41 -05:00
parent 94abbf247f
commit 591e009326
5 changed files with 54 additions and 25 deletions
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common/utils/nr/nr_common.c
+41
View File
@@ -1298,6 +1298,47 @@ uint8_t get_long_prach_dur(unsigned int format, unsigned int mu)
return (prach_dur_subframes * num_slots_subframe);
}
// Table 38.211 6.3.3.2-1
uint8_t get_PRACH_k_bar(unsigned int delta_f_RA_PRACH, unsigned int delta_f_PUSCH)
{
uint8_t k_bar = 0;
if (delta_f_RA_PRACH > 3) { // Rel 15 max PRACH SCS is 120 kHz, 4 and 5 are 1.25 and 5 kHz
// long formats
DevAssert(delta_f_PUSCH < 3);
DevAssert(delta_f_RA_PRACH < 6);
const uint8_t k_bar_table[3][2] = {{7, 12},
{1, 10},
{133, 7}};
k_bar = k_bar_table[delta_f_PUSCH][delta_f_RA_PRACH - 4];
} else {
if (delta_f_RA_PRACH == 3 && delta_f_PUSCH == 4) // \delta f_RA == 120 kHz AND \delta f == 480 kHz
k_bar = 1;
else if (delta_f_RA_PRACH == 3 && delta_f_PUSCH == 5) // \delta f_RA == 120 kHz AND \delta f == 960 kHz
k_bar = 23;
else
k_bar = 2;
}
return k_bar;
}
// K according to 38.211 5.3.2
unsigned int get_prach_K(int prach_sequence_length, int prach_fmt_id, int pusch_mu, int prach_mu)
{
unsigned int K = 1;
if (prach_sequence_length == 0) {
if (prach_fmt_id == 3)
K = (15 << pusch_mu) / 5;
else
K = (15 << pusch_mu) / 1.25;
} else if (prach_sequence_length == 1) {
K = (15 << pusch_mu) / (15 << prach_mu);
} else {
AssertFatal(0, "Invalid PRACH sequence length %d\n", prach_sequence_length);
}
return K;
}
int get_delay_idx(int delay, int max_delay_comp)
{
int delay_idx = max_delay_comp + delay;
common/utils/nr/nr_common.h
+2
View File
@@ -288,6 +288,8 @@ int get_smallest_supported_bandwidth_index(int scs, frequency_range_t frequency_
unsigned short get_m_srs(int c_srs, int b_srs);
unsigned short get_N_b_srs(int c_srs, int b_srs);
uint8_t get_long_prach_dur(unsigned int format, unsigned int num_slots_subframe);
uint8_t get_PRACH_k_bar(unsigned int delta_f_RA_PRACH, unsigned int delta_f_PUSCH);
unsigned int get_prach_K(int prach_sequence_length, int prach_fmt_id, int pusch_mu, int prach_mu);
int get_slot_idx_in_period(const int slot, const frame_structure_t *fs);