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[FHI72] Handle long PRACH format

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Only static long PRACH configuration verified, i.e. PRACH C-plane
is ignored by the RU.

Note: Introducing `N_ZC` and `num_prbu` parameters is needed for testing
with xran F release. However, in the K release, this information is
stored in xran_rx_packet_ctl struct.
This commit is contained in:
Teodora Vladić
2026-03-16 15:56:30 +01:00
committed by Teodora
parent 63b048b2ff
commit 141690c780
3 changed files with 300 additions and 9 deletions
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radio/fhi_72/oaioran.c
+18 -9
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@@ -178,6 +178,16 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
struct xran_fh_config *fh_cfg = get_xran_fh_config(0);
nr_prach_info_t prach_info = get_prach_info(0);
uint16_t N_ZC, num_prbu;
if ((prach_info.format & 0xff) < 4) {
N_ZC = 839;
num_prbu = 70;
prach_info.N_dur = 1;
} else {
N_ZC = 139;
num_prbu = 12;
}
int prach_start_sym = prach_info.start_symbol;
int prach_end_sym = prach_info.N_dur + prach_start_sym;
struct xran_ru_config *ru_conf = &fh_cfg->ru_conf;
@@ -198,25 +208,25 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
/* convert Network order to host order */
if (ru_conf->compMeth_PRACH == XRAN_COMPMETHOD_NONE) {
if (sym_idx == prach_start_sym) {
for (idx = 0; idx < 139 * 2; idx++) {
for (idx = 0; idx < N_ZC * 2; idx++) {
dst[idx] = ((int16_t)ntohs(src[idx + g_kbar]));
}
} else {
for (idx = 0; idx < 139 * 2; idx++) {
for (idx = 0; idx < N_ZC * 2; idx++) {
dst[idx] += ((int16_t)ntohs(src[idx + g_kbar]));
}
}
} else if (ru_conf->compMeth_PRACH == XRAN_COMPMETHOD_BLKFLOAT) {
int16_t local_dst[12 * 2 * N_SC_PER_PRB] __attribute__((aligned(64)));
int16_t local_dst[num_prbu * 2 * N_SC_PER_PRB] __attribute__((aligned(64)));
#if defined(__i386__) || defined(__x86_64__)
struct xranlib_decompress_request bfp_decom_req = {};
struct xranlib_decompress_response bfp_decom_rsp = {};
int payload_len = (3 * ru_conf->iqWidth_PRACH + 1) * 12; // 12 = closest number of PRBs to 139 REs
int payload_len = (3 * ru_conf->iqWidth_PRACH + 1) * num_prbu;
bfp_decom_req.data_in = (int8_t *)src;
bfp_decom_req.numRBs = 12; // closest number of PRBs to 139 REs
bfp_decom_req.numRBs = num_prbu;
bfp_decom_req.len = payload_len;
bfp_decom_req.compMethod = XRAN_COMPMETHOD_BLKFLOAT;
bfp_decom_req.iqWidth = ru_conf->iqWidth_PRACH;
@@ -225,16 +235,15 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
bfp_decom_rsp.len = 0;
xranlib_decompress_avx512(&bfp_decom_req, &bfp_decom_rsp);
#elif defined(__arm__) || defined(__aarch64__)
armral_bfp_decompression(ru_conf->iqWidth_PRACH, 12, (int8_t *)src, (int16_t *)local_dst);
armral_bfp_decompression(ru_conf->iqWidth_PRACH, num_prbu, (int8_t *)src, (int16_t *)local_dst);
#else
AssertFatal(1 == 0, "BFP decompression not supported on this architecture");
#endif
// note: this is hardwired for 139 point PRACH sequence, kbar=2
if (sym_idx == prach_start_sym)
for (idx = 0; idx < (139 * 2); idx++)
for (idx = 0; idx < (N_ZC * 2); idx++)
dst[idx] = local_dst[idx + g_kbar];
else
for (idx = 0; idx < (139 * 2); idx++)
for (idx = 0; idx < (N_ZC * 2); idx++)
dst[idx] += (local_dst[idx + g_kbar]);
} // COMPMETHOD_BLKFLOAT
} // aa