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@ -47,15 +47,11 @@
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#define PDCCH_FORMAT_NOF_REGS(i) ((1<<i)*9)
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#define PDCCH_FORMAT_NOF_BITS(i) ((1<<i)*72)
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int pdcch_put(cf_t *pdcch, cf_t *slot1_data, int nsymbols) {
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memcpy(slot1_data, pdcch, sizeof(cf_t) * nsymbols);
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return nsymbols;
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}
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#define NOF_COMMON_FORMATS 2
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const dci_format_t common_formats[NOF_COMMON_FORMATS] = {Format1A, Format1C};
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int pdcch_get(cf_t *slot1_data, cf_t *pdcch, int nsymbols) {
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memcpy(pdcch, slot1_data, sizeof(cf_t) * nsymbols);
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return nsymbols;
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}
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#define NOF_UE_FORMATS 2
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const dci_format_t ue_formats[NOF_UE_FORMATS] = {Format0, Format1}; // 1A has the same payload as 0
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#define MIN(a,b) ((a>b)?b:a)
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@ -63,18 +59,18 @@ int pdcch_get(cf_t *slot1_data, cf_t *pdcch, int nsymbols) {
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* 36.213 9.1
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*/
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int gen_common_search(dci_candidate_t *c, int nof_cce, int nof_bits, unsigned short rnti) {
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int i, L, k;
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int i, l, L, k;
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k = 0;
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for (L = 2; L > 0; L--) {
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for (i = 0; i < MIN(nof_cce,16) / (4 * L); i++) {
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c[k].L = 4 * L;
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for (l = 3; l > 1; l--) {
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L = (1 << l);
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for (i = 0; i < MIN(nof_cce,16) / (L); i++) {
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c[k].L = l;
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c[k].nof_bits = nof_bits;
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c[k].rnti = rnti;
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c[k].ncce = (4 * L) * (i % (nof_cce / (4 * L)));
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k++;
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INFO(
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"Common SS Candidate %d: RNTI: 0x%x, nCCE: %d, Nbits: %d, L: %d\n",
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c[k].ncce = (L) * (i % (nof_cce / (L)));
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INFO("Common SS Candidate %d: RNTI: 0x%x, nCCE: %d, Nbits: %d, L: %d\n",
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k, c[k].rnti, c[k].ncce, c[k].nof_bits, c[k].L);
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k++;
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}
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}
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return k;
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@ -88,6 +84,11 @@ int gen_ue_search(dci_candidate_t *c, int nof_cce, int nof_bits, unsigned short
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unsigned int Yk;
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const int S[4] = { 6, 12, 8, 16 };
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k = 0;
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if (!subframe) {
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INFO("UE-specific candidates for RNTI: 0x%x, NofBits: %d, NofCCE: %d\n",
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rnti, nof_bits, nof_cce);
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if (VERBOSE_ISINFO()) printf("[INFO]: ");
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}
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for (l = 3; l >= 0; l--) {
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L = (1 << l);
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for (i = 0; i < MIN(nof_cce/L,16/S[l]); i++) {
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@ -99,27 +100,35 @@ int gen_ue_search(dci_candidate_t *c, int nof_cce, int nof_bits, unsigned short
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Yk = (39827 * Yk) % 65537;
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}
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c[k].ncce = L * ((Yk + i) % (nof_cce / L));
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INFO("UE-specific SS Candidate %d: SF: %d, RNTI: 0x%x, nCCE: %d, Nbits: %d, L: %d\n",
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k, subframe, c[k].rnti, c[k].ncce, c[k].nof_bits, c[k].L);
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if (!subframe) {
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if (VERBOSE_ISINFO()) {
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printf("(%d, %d), ", c[k].ncce, c[k].L);
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}
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}
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k++;
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}
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}
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if (!subframe) {
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if (VERBOSE_ISINFO()) printf("\n");
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}
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return k;
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}
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void pdcch_init_common(pdcch_t *q, pdcch_search_t *s, unsigned short rnti) {
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int k;
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s->nof_candidates = 2*(MIN(q->nof_cce,16) / 4 + MIN(q->nof_cce,16) / 8);
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int k, i;
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s->nof_candidates = NOF_COMMON_FORMATS*(MIN(q->nof_cce,16) / 4 + MIN(q->nof_cce,16) / 8);
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if (s->nof_candidates) {
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s->candidates[0] = malloc(sizeof(dci_candidate_t) * s->nof_candidates);
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dci_candidate_t *c = s->candidates[0];
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s->nof_candidates = 0;
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if (c) {
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// Format 1A and 1C L=4 and L=8, 4 and 2 candidates, only if nof_cce > 16
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k = 0;
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for(i=0;i<NOF_COMMON_FORMATS;i++) {
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k += gen_common_search(&c[k], q->nof_cce,
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dci_format1A_sizeof(q->nof_prb, true), SIRNTI);
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k += gen_common_search(&c[k], q->nof_cce,
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dci_format1C_sizeof(q->nof_prb), SIRNTI);
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dci_format_sizeof(common_formats[i], q->nof_prb), SIRNTI);
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s->nof_candidates++;
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}
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}
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}
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}
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@ -137,11 +146,11 @@ void pdcch_init_search_si(pdcch_t *q) {
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* DCI Format 1A and 1 + PUSCH scheduling format 0
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*/
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void pdcch_init_search_ue(pdcch_t *q, unsigned short c_rnti) {
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int l, n, k;
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int l, n, k, i;
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pdcch_search_t *s = &q->search_mode[SEARCH_UE];
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s->nof_candidates = 0;
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for (l=0;l<3;l++) {
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s->nof_candidates += 3*(MIN(q->nof_cce,16) / (1<<l));
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s->nof_candidates += NOF_UE_FORMATS*(MIN(q->nof_cce,16) / (1<<l));
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}
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INFO("Initiating %d candidate(s) in the UE-specific search space for C-RNTI: 0x%x\n", s->nof_candidates, c_rnti);
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if (s->nof_candidates) {
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@ -152,12 +161,10 @@ void pdcch_init_search_ue(pdcch_t *q, unsigned short c_rnti) {
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if (c) {
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// Expect Formats 1, 1A, 0
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k = 0;
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for(i=0;i<NOF_UE_FORMATS;i++) {
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k += gen_ue_search(&c[k], q->nof_cce,
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dci_format0_sizeof(q->nof_prb), c_rnti, n);
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k += gen_ue_search(&c[k], q->nof_cce,
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dci_format1_sizeof(q->nof_prb, 1), c_rnti, n);
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k += gen_ue_search(&c[k], q->nof_cce,
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dci_format1A_sizeof(q->nof_prb, true), c_rnti, n);
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dci_format_sizeof(ue_formats[i], q->nof_prb), c_rnti, n);
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}
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|
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}
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}
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}
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@ -200,15 +207,16 @@ int pdcch_init(pdcch_t *q, regs_t *regs, int nof_prb, int nof_ports,
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q->cp = cp;
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q->regs = regs;
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q->nof_ports = nof_ports;
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q->nof_prb = nof_prb;
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|
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q->current_search_mode = SEARCH_NONE;
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|
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q->nof_regs = regs_pdcch_nregs(q->regs);
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q->nof_regs = (regs_pdcch_nregs(q->regs)/9)*9;
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q->nof_cce = q->nof_regs / 9;
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|
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q->nof_symbols = 4 * q->nof_regs;
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|
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q->nof_bits = 2 * q->nof_symbols;
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|
|
INFO("Init PDCCH: %d REGs, %d bits, %d symbols, %d ports\n", q->nof_regs,
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|
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q->nof_bits, q->nof_symbols, q->nof_ports);
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|
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INFO("Init PDCCH: %d CCEs (%d REGs), %d bits, %d symbols, %d ports\n", q->nof_cce,
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|
|
q->nof_regs, q->nof_bits, q->nof_symbols, q->nof_ports);
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|
|
if (modem_table_std(&q->mod, LTE_QPSK, true)) {
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|
|
goto clean;
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|
|
@ -314,11 +322,18 @@ unsigned short dci_decode(viterbi_t *decoder, float *e, char *data, int E,
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int nof_bits) {
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float tmp[3 * (DCI_MAX_BITS + 16)];
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unsigned short p_bits;
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unsigned short p_bits, crc_res;
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char *x;
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|
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assert(nof_bits < DCI_MAX_BITS);
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/* char a[] = {1,1,0,0,1,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,1,0,1,1,0,1,1,1,1,1,0,1,0,1,1,0,1,0,0,0,1,0,0,1,1,1,1,0,1,0,1,1,0,0,0,0,0,1,1,0,0,0,0,1,0,0,1,0,0,0,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,0,1,0,1,1,1,0,0,1,1,0,1,0,1,1,0,0,1,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,1,0,1,1,0,1,1,1,1,1,0,1,0,1,1,0,1,0,0,0,1,0,0,1,1,1,1,0,1,0,1,1,0,0,0,0,0,1,1,0,0,0,0,1,0,0,1,0,0,0,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,0,1,0,1,1,1,0,0,1,1,0,1,0,1,1,0,0,1,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,1,0,1,1,0,1,1,1,1,1,0,1,0,1,1,0,1,0,0,0,1,0,0,1,1,1,1,0,1,0,1,1,0,0,0,0,0,1,1,0,0,0,0,1,0,0,1,0,0,0,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,0,1,0,1,1,1,0,0,1,1,0,1,0,1,1,0,0,1,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,1,0,1,1,0,1,1,1,1,1,0,1,0,1,1,0,1,0,0,0,1,0,0,1,1,1,1,0,1,0,1,1,0,0,0,0,0,1,1,0,0,0,0,1,0,0,1,0,0,0,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,0,1,0,1,1,1,0,0,1,1,0,1,0,1,1,0,0,1,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,1,0,1,1,0,1,1,1,1,1,0,1,0,1,1,0,1,0,0,0,1,0,0,1,1,1,1,0,1,0,1,1,0,0,0,0,0,1,1,0,0,0,0,1,0,0,1,0,0,0,0};
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float *b = malloc(sizeof(E));
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for (int i=0;i<E;i++) {
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|
b[i] = a[i]?1:-1;
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}
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|
*/
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|
|
/* unrate matching */
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|
|
rm_conv_rx(e, tmp, E, 3 * (nof_bits + 16));
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|
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|
|
|
@ -330,24 +345,31 @@ unsigned short dci_decode(viterbi_t *decoder, float *e, char *data, int E,
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|
|
/* viterbi decoder */
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|
|
viterbi_decode_f(decoder, tmp, data, nof_bits + 16);
|
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|
|
|
|
|
|
|
|
if (VERBOSE_ISDEBUG()) {
|
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|
|
|
bit_fprint(stdout, data, nof_bits+16);
|
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|
|
|
}
|
|
|
|
|
|
|
|
|
|
x = &data[nof_bits];
|
|
|
|
|
p_bits = (unsigned short) bit_unpack(&x, 16);
|
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|
|
|
|
|
|
|
|
return (p_bits
|
|
|
|
|
^ ((unsigned short) crc(0, data, nof_bits, 16, LTE_CRC16, 0)
|
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|
|
|
& 0xffff));
|
|
|
|
|
crc_res = ((unsigned short) crc(0, data, nof_bits, 16, LTE_CRC16, 0)
|
|
|
|
|
& 0xffff);
|
|
|
|
|
DEBUG("p_bits: 0x%x, crc_res: 0x%x, tot: 0x%x\n", p_bits, crc_res, p_bits ^ crc_res);
|
|
|
|
|
return (p_bits ^ crc_res);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int pdcch_decode_candidate(pdcch_t *q, float *llr, dci_candidate_t *c,
|
|
|
|
|
dci_msg_t *msg) {
|
|
|
|
|
unsigned short crc_res;
|
|
|
|
|
DEBUG("Trying Candidate: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
|
c->nof_bits, PDCCH_FORMAT_NOF_BITS(c->L), c->ncce, c->L,
|
|
|
|
|
c->rnti);
|
|
|
|
|
crc_res = dci_decode(&q->decoder, &llr[72 * c->ncce], msg->data,
|
|
|
|
|
PDCCH_FORMAT_NOF_BITS(c->L), c->nof_bits);
|
|
|
|
|
|
|
|
|
|
if (c->rnti == crc_res) {
|
|
|
|
|
memcpy(&msg->location, c, sizeof(dci_candidate_t));
|
|
|
|
|
INFO(
|
|
|
|
|
"FOUND CAND: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
|
"FOUND Candidate: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
|
c->nof_bits, PDCCH_FORMAT_NOF_BITS(c->L), c->ncce, c->L,
|
|
|
|
|
c->rnti);
|
|
|
|
|
return 1;
|
|
|
|
|
@ -379,25 +401,21 @@ int pdcch_extract_llr(pdcch_t *q, cf_t *slot1_symbols, cf_t *ce[MAX_PORTS_CTRL],
|
|
|
|
|
memset(&x[q->nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->nof_ports));
|
|
|
|
|
|
|
|
|
|
/* extract symbols */
|
|
|
|
|
if (q->nof_symbols
|
|
|
|
|
!= pdcch_get(slot1_symbols, q->pdcch_symbols[0], q->nof_symbols)) {
|
|
|
|
|
fprintf(stderr, "There was an error getting the PDCCH symbols\n");
|
|
|
|
|
int n = regs_pdcch_get(q->regs, slot1_symbols, q->pdcch_symbols[0]);
|
|
|
|
|
if (q->nof_symbols != n) {
|
|
|
|
|
fprintf(stderr, "Expected %d PDCCH symbols but got %d symbols\n", q->nof_symbols, n);
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
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/* extract channel estimates */
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for (i = 0; i < q->nof_ports; i++) {
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if (q->nof_symbols != pdcch_get(ce[i], q->ce[i], q->nof_symbols)) {
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fprintf(stderr, "There was an error getting the PDCCH symbols\n");
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n = regs_pdcch_get(q->regs, ce[i], q->ce[i]);
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if (q->nof_symbols != n) {
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fprintf(stderr, "Expected %d PDCCH symbols but got %d symbols\n", q->nof_symbols, n);
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return -1;
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}
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}
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DEBUG("pdcch_symbols: ", 0);
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if (VERBOSE_ISDEBUG()) {
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vec_fprint_c(stdout, q->pdcch_symbols[0], q->nof_symbols);
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}
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/* in control channels, only diversity is supported */
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if (q->nof_ports == 1) {
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/* no need for layer demapping */
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@ -410,13 +428,18 @@ int pdcch_extract_llr(pdcch_t *q, cf_t *slot1_symbols, cf_t *ce[MAX_PORTS_CTRL],
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q->nof_symbols / q->nof_ports);
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}
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DEBUG("pdcch d symbols: ", 0);
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if (VERBOSE_ISDEBUG()) {
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vec_fprint_c(stdout, q->pdcch_d, q->nof_symbols);
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}
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/* demodulate symbols */
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demod_soft_sigma_set(&q->demod, ebno);
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demod_soft_demodulate(&q->demod, q->pdcch_d, q->pdcch_llr, q->nof_symbols);
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DEBUG("llr: ", 0);
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if (VERBOSE_ISDEBUG()) {
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vec_fprint_f(stdout, q->pdcch_llr, q->nof_symbols);
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vec_fprint_f(stdout, q->pdcch_llr, q->nof_bits);
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}
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/* descramble */
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@ -426,7 +449,6 @@ int pdcch_extract_llr(pdcch_t *q, cf_t *slot1_symbols, cf_t *ce[MAX_PORTS_CTRL],
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}
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int pdcch_decode_current_mode(pdcch_t *q, float *llr, dci_t *dci, int subframe) {
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int dci_cnt;
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int k, i;
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if (q->current_search_mode == SEARCH_UE) {
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@ -435,16 +457,15 @@ int pdcch_decode_current_mode(pdcch_t *q, float *llr, dci_t *dci, int subframe)
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k = 0;
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}
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dci_cnt = 0;
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for (i = 0; i < q->search_mode[q->current_search_mode].nof_candidates
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|
&& dci_cnt < dci->nof_dcis; i++) {
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&& dci->nof_dcis < dci->max_dcis; i++) {
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if (pdcch_decode_candidate(q, q->pdcch_llr,
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&q->search_mode[q->current_search_mode].candidates[k][i],
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&dci->msg[dci_cnt])) {
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|
dci_cnt++;
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&dci->msg[dci->nof_dcis])) {
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dci->nof_dcis++;
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}
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}
|
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|
return dci_cnt;
|
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|
return dci->nof_dcis;
|
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|
}
|
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|
int pdcch_decode_si(pdcch_t *q, float *llr, dci_t *dci) {
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|
@ -578,7 +599,7 @@ int pdcch_encode(pdcch_t *q, dci_t *dci, cf_t *slot1_symbols[MAX_PORTS_CTRL],
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|
/* mapping to resource elements */
|
|
|
|
|
for (i = 0; i < q->nof_ports; i++) {
|
|
|
|
|
pdcch_put(q->pdcch_symbols[i], slot1_symbols[i], q->nof_symbols);
|
|
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|
|
regs_pdcch_put(q->regs, q->pdcch_symbols[i], slot1_symbols[i]);
|
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|
|
}
|
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|
return 0;
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|
}
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ismagom
11 years ago