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@ -46,173 +46,11 @@
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#define PDCCH_FORMAT_NOF_REGS(i) ((1<<i)*9)
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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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#define PDCCH_FORMAT_NOF_BITS(i) ((1<<i)*72)
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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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#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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#define MIN(a,b) ((a>b)?b:a)
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void set_cfi(pdcch_t *q, uint32_t cfi);
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/**
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* 36.213 9.1
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*/
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int gen_common_search(dci_candidate_t *c, uint32_t nof_cce, uint32_t nof_bits,
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uint16_t rnti) {
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int i, l, L, k;
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k = 0;
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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 = (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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}
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/**
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* 36.213 9.1
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*/
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int gen_ue_search(dci_candidate_t *c, uint32_t nof_cce, uint32_t nof_bits,
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uint16_t rnti, uint32_t subframe) {
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int i, l, L, k, m;
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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 (VERBOSE_ISDEBUG()) {
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printf("NofBits=%d, RNTI: 0x%x, SF=%d (n, L): ", nof_bits, rnti, subframe);
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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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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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Yk = rnti;
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for (m = 0; m < subframe; m++) {
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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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if (VERBOSE_ISDEBUG()) {
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printf("(%d, %d), ", c[k].ncce, c[k].L);
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}
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if (c[k].ncce + PDCCH_FORMAT_NOF_CCE(c[k].L) > nof_cce ||
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nof_bits > DCI_MAX_BITS) {
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fprintf(stderr, "Illegal DCI message\n");
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return LIBLTE_ERROR;
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}
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k++;
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}
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}
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if (VERBOSE_ISDEBUG()) {
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printf("\n");
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}
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return k;
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}
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/** 36.213 v9.3 Table 7.1-5
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* user-specific search space. Currently supported transmission Mode 1:
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* DCI Format 1A and 1 + PUSCH scheduling format 0
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*/
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int pdcch_init_search_ue(pdcch_t *q, uint16_t c_rnti, uint32_t cfi) {
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int k, i, r;
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uint32_t n;
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set_cfi(q, cfi);
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pdcch_search_t *s = &q->search_mode[SEARCH_UE];
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for (n = 0; n < NSUBFRAMES_X_FRAME; n++) {
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dci_candidate_t *c = s->candidates[n];
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if (!n) s->nof_candidates = 0;
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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 && k < MAX_CANDIDATES; i++) {
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r = gen_ue_search(&c[k], q->nof_cce,
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dci_format_sizeof(ue_formats[i], q->cell.nof_prb), c_rnti, n);
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if (r < 0) {
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fprintf(stderr, "Error generating UE-specific search space\n");
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return r;
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}
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k += r;
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}
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s->nof_candidates = k;
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}
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INFO("Initiated %d candidate(s) in the UE-specific search space for C-RNTI: 0x%x\n",
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s->nof_candidates, c_rnti);
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q->current_search_mode = SEARCH_UE;
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return LIBLTE_SUCCESS;
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}
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int pdcch_init_common(pdcch_t *q, pdcch_search_t *s, uint16_t rnti) {
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int k, r, i;
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dci_candidate_t *c = s->candidates[0];
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s->nof_candidates = 0;
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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 && k < MAX_CANDIDATES; i++) {
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r = gen_common_search(&c[k], q->nof_cce,
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dci_format_sizeof(common_formats[i], q->cell.nof_prb), SIRNTI);
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if (r < 0) {
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return r;
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}
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k += r;
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}
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s->nof_candidates=k;
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INFO("Initiated %d candidate(s) in the Common search space for RNTI: 0x%x\n",
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s->nof_candidates, rnti);
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return LIBLTE_SUCCESS;
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}
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/** 36.213 v9.3 Table 7.1-1: System Information DCI messages
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* Expect DCI formats 1C and 1A in the common search space
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*/
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int pdcch_init_search_si(pdcch_t *q, uint32_t cfi) {
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set_cfi(q, cfi);
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int r = pdcch_init_common(q, &q->search_mode[SEARCH_SI], SIRNTI);
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if (r >= 0) {
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q->current_search_mode = SEARCH_SI;
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}
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return r;
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}
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/** 36.213 v9.3 Table 7.1-3
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* Expect DCI formats 1C and 1A in the common search space
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*/
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int pdcch_init_search_ra(pdcch_t *q, uint16_t ra_rnti, uint32_t cfi) {
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set_cfi(q, cfi);
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int r = pdcch_init_common(q, &q->search_mode[SEARCH_RA], ra_rnti);
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if (r >= 0) {
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q->current_search_mode = SEARCH_RA;
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}
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return r;
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}
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void pdcch_set_search_si(pdcch_t *q) {
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q->current_search_mode = SEARCH_SI;
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}
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void pdcch_set_search_ue(pdcch_t *q) {
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q->current_search_mode = SEARCH_UE;
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}
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void pdcch_set_search_ra(pdcch_t *q) {
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q->current_search_mode = SEARCH_RA;
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}
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void set_cfi(pdcch_t *q, uint32_t cfi) {
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static void set_cfi(pdcch_t *q, uint32_t cfi) {
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if (cfi > 0 && cfi < 4) {
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if (cfi > 0 && cfi < 4) {
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q->nof_regs = (regs_pdcch_nregs(q->regs, cfi) / 9) * 9;
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q->nof_regs = (regs_pdcch_nregs(q->regs, cfi) / 9) * 9;
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q->nof_cce = q->nof_regs / 9;
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q->nof_cce = q->nof_regs / 9;
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@ -221,6 +59,7 @@ void set_cfi(pdcch_t *q, uint32_t cfi) {
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}
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}
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}
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}
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/** Initializes the PDCCH transmitter and receiver */
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/** Initializes the PDCCH transmitter and receiver */
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int pdcch_init(pdcch_t *q, regs_t *regs, lte_cell_t cell) {
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int pdcch_init(pdcch_t *q, regs_t *regs, lte_cell_t cell) {
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int ret = LIBLTE_ERROR_INVALID_INPUTS;
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int ret = LIBLTE_ERROR_INVALID_INPUTS;
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@ -234,7 +73,6 @@ int pdcch_init(pdcch_t *q, regs_t *regs, lte_cell_t cell) {
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bzero(q, sizeof(pdcch_t));
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bzero(q, sizeof(pdcch_t));
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q->cell = cell;
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q->cell = cell;
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q->regs = regs;
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q->regs = regs;
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q->current_search_mode = SEARCH_NONE;
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/* Now allocate memory for the maximum number of REGs (CFI=3)
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/* Now allocate memory for the maximum number of REGs (CFI=3)
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*/
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*/
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@ -261,7 +99,7 @@ int pdcch_init(pdcch_t *q, regs_t *regs, lte_cell_t cell) {
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}
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}
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}
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}
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int poly[3] = { 0x6D, 0x4F, 0x57 };
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uint32_t poly[3] = { 0x6D, 0x4F, 0x57 };
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if (viterbi_init(&q->decoder, viterbi_37, poly, DCI_MAX_BITS + 16, true)) {
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if (viterbi_init(&q->decoder, viterbi_37, poly, DCI_MAX_BITS + 16, true)) {
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goto clean;
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goto clean;
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}
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}
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@ -337,13 +175,97 @@ void pdcch_free(pdcch_t *q) {
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viterbi_free(&q->decoder);
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viterbi_free(&q->decoder);
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}
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}
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/** 36.213 v9.1.1
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* Computes up to max_candidates UE-specific candidates for DCI messages and saves them
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* in the structure pointed by c.
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* Returns the number of candidates saved in the array c.
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*/
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uint32_t pdcch_ue_locations(pdcch_t *q, dci_location_t *c, uint32_t max_candidates,
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uint32_t nsubframe, uint32_t cfi, uint16_t rnti) {
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uint32_t i, k, l, L, m;
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uint32_t Yk, ncce;
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const int S[4] = { 6, 12, 8, 16 };
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
set_cfi(q, cfi);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// Compute Yk for this subframe
|
|
|
|
|
|
|
|
Yk = rnti;
|
|
|
|
|
|
|
|
for (m = 0; m < nsubframe; m++) {
|
|
|
|
|
|
|
|
Yk = (39827 * Yk) % 65537;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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|
|
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|
|
k = 0;
|
|
|
|
|
|
|
|
// All aggregation levels from 8 to 1
|
|
|
|
|
|
|
|
for (l = 3; l >= 0; l--) {
|
|
|
|
|
|
|
|
L = (1 << l);
|
|
|
|
|
|
|
|
// For all possible ncce offset
|
|
|
|
|
|
|
|
for (i = 0; i < MIN(q->nof_cce / L, 16 / S[l]); i++) {
|
|
|
|
|
|
|
|
ncce = L * ((Yk + i) % (q->nof_cce / L));
|
|
|
|
|
|
|
|
if (k < max_candidates &&
|
|
|
|
|
|
|
|
ncce + PDCCH_FORMAT_NOF_CCE(L) < q->nof_cce)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
c[k].L = l;
|
|
|
|
|
|
|
|
c[k].ncce = ncce;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DEBUG("UE-specific SS Candidate %d: nCCE: %d, L: %d\n",
|
|
|
|
|
|
|
|
k, c[k].ncce, c[k].L);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
k++;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
INFO("Initiated %d candidate(s) in the UE-specific search space for C-RNTI: 0x%x\n", k, rnti);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
return k;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
|
|
|
* 36.213 9.1.1
|
|
|
|
|
|
|
|
* Computes up to max_candidates candidates in the common search space
|
|
|
|
|
|
|
|
* for DCI messages and saves them in the structure pointed by c.
|
|
|
|
|
|
|
|
* Returns the number of candidates saved in the array c.
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
uint32_t pdcch_common_locations(pdcch_t *q, dci_location_t *c, uint32_t max_candidates,
|
|
|
|
|
|
|
|
uint32_t cfi) {
|
|
|
|
|
|
|
|
uint32_t i, l, L, k;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
set_cfi(q, cfi);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
k = 0;
|
|
|
|
|
|
|
|
for (l = 3; l > 1; l--) {
|
|
|
|
|
|
|
|
L = (1 << l);
|
|
|
|
|
|
|
|
for (i = 0; i < MIN(q->nof_cce, 16) / (L); i++) {
|
|
|
|
|
|
|
|
if (k < max_candidates) {
|
|
|
|
|
|
|
|
c[k].L = l;
|
|
|
|
|
|
|
|
c[k].ncce = (L) * (i % (q->nof_cce / (L)));
|
|
|
|
|
|
|
|
DEBUG("Common SS Candidate %d: nCCE: %d, L: %d\n",
|
|
|
|
|
|
|
|
k, c[k].ncce, c[k].L);
|
|
|
|
|
|
|
|
k++;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
INFO("Initiated %d candidate(s) in the Common search space\n", k);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
return k;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/** 36.212 5.3.3.2 to 5.3.3.4
|
|
|
|
/** 36.212 5.3.3.2 to 5.3.3.4
|
|
|
|
*
|
|
|
|
*
|
|
|
|
* Returns XOR between parity and remainder bits
|
|
|
|
* Returns XOR between parity and remainder bits
|
|
|
|
*
|
|
|
|
*
|
|
|
|
* TODO: UE transmit antenna selection CRC mask
|
|
|
|
* TODO: UE transmit antenna selection CRC mask
|
|
|
|
*/
|
|
|
|
*/
|
|
|
|
int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof_bits, uint16_t *crc) {
|
|
|
|
static int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof_bits, uint16_t *crc) {
|
|
|
|
|
|
|
|
|
|
|
|
float tmp[3 * (DCI_MAX_BITS + 16)];
|
|
|
|
float tmp[3 * (DCI_MAX_BITS + 16)];
|
|
|
|
uint16_t p_bits, crc_res;
|
|
|
|
uint16_t p_bits, crc_res;
|
|
|
|
@ -355,6 +277,10 @@ int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof_bits,
|
|
|
|
nof_bits < DCI_MAX_BITS)
|
|
|
|
nof_bits < DCI_MAX_BITS)
|
|
|
|
{
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (VERBOSE_ISDEBUG()) {
|
|
|
|
|
|
|
|
vec_fprint_f(stdout, e, E);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* unrate matching */
|
|
|
|
/* unrate matching */
|
|
|
|
rm_conv_rx(e, E, tmp, 3 * (nof_bits + 16));
|
|
|
|
rm_conv_rx(e, E, tmp, 3 * (nof_bits + 16));
|
|
|
|
|
|
|
|
|
|
|
|
@ -385,36 +311,63 @@ int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof_bits,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int pdcch_decode_candidate(pdcch_t *q, float *llr, dci_candidate_t *c,
|
|
|
|
/** Tries to decode a DCI message from the LLRs stored in the pdcch_t structure by the function
|
|
|
|
dci_msg_t *msg) {
|
|
|
|
* pdcch_extract_llr(). This function can be called multiple times.
|
|
|
|
uint16_t crc_res;
|
|
|
|
* The decoded message is stored in msg. Up to nof_locations are tried from the array of dci_locations_t
|
|
|
|
INFO("Trying Candidate: Nbits: %d, E: %3d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
* pointed by locations. The CRC is checked agains the RNTI parameter.
|
|
|
|
c->nof_bits, PDCCH_FORMAT_NOF_BITS(c->L), c->ncce, c->L, c->rnti);
|
|
|
|
*
|
|
|
|
|
|
|
|
* Returns 1 if the message is correctly decoded, 0 if not and -1 on error.
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
int pdcch_decode_msg(pdcch_t *q, dci_msg_t *msg,
|
|
|
|
|
|
|
|
dci_location_t *locations, uint32_t nof_locations,
|
|
|
|
|
|
|
|
dci_format_t format, uint16_t rnti)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
if (q != NULL &&
|
|
|
|
|
|
|
|
msg != NULL &&
|
|
|
|
|
|
|
|
locations != NULL &&
|
|
|
|
|
|
|
|
nof_locations > 0)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
uint16_t crc_res;
|
|
|
|
|
|
|
|
uint32_t nof_bits = dci_format_sizeof(format, q->cell.nof_prb);
|
|
|
|
|
|
|
|
uint32_t i;
|
|
|
|
|
|
|
|
|
|
|
|
if (dci_decode(q, &llr[72 * c->ncce], msg->data,
|
|
|
|
i = 0;
|
|
|
|
PDCCH_FORMAT_NOF_BITS(c->L), c->nof_bits, &crc_res)) {
|
|
|
|
do {
|
|
|
|
return LIBLTE_ERROR;
|
|
|
|
INFO("Trying Candidate: Nbits: %d, E: %3d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
}
|
|
|
|
nof_bits, PDCCH_FORMAT_NOF_BITS(locations[i].L), locations[i].ncce, locations[i].L, rnti);
|
|
|
|
|
|
|
|
|
|
|
|
if (c->rnti == crc_res) {
|
|
|
|
if (dci_decode(q, &q->pdcch_llr[72 * locations[i].ncce], msg->data,
|
|
|
|
memcpy(&msg->location, c, sizeof(dci_candidate_t));
|
|
|
|
PDCCH_FORMAT_NOF_BITS(locations[i].L), nof_bits, &crc_res) != LIBLTE_SUCCESS) {
|
|
|
|
INFO("FOUND Candidate: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
return LIBLTE_ERROR;
|
|
|
|
c->nof_bits, PDCCH_FORMAT_NOF_BITS(c->L), c->ncce, c->L, c->rnti);
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
if (crc_res != rnti) {
|
|
|
|
|
|
|
|
i++;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
} while(i < nof_locations && crc_res != rnti);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (rnti == crc_res) {
|
|
|
|
|
|
|
|
msg->nof_bits = nof_bits;
|
|
|
|
|
|
|
|
INFO("FOUND Candidate: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
|
|
|
|
nof_bits, PDCCH_FORMAT_NOF_BITS(locations[i].L), locations[i].ncce, locations[i].L, rnti);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
} else {
|
|
|
|
|
|
|
|
return LIBLTE_SUCCESS;
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return LIBLTE_SUCCESS;
|
|
|
|
return LIBLTE_ERROR_INVALID_INPUTS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int pdcch_extract_llr(pdcch_t *q, cf_t *slot_symbols, cf_t *ce[MAX_PORTS],
|
|
|
|
/** Extracts the LLRs from the subframe symbols (demodulation) and stores them in the pdcch_t structure.
|
|
|
|
float *llr, uint32_t nsubframe, uint32_t cfi) {
|
|
|
|
* DCI messages can be extracted calling the function pdcch_decode_msg().
|
|
|
|
|
|
|
|
* Every time this function is called, the last demodulated symbols are overwritten.
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
int pdcch_extract_llr(pdcch_t *q, cf_t *sf_symbols, cf_t *ce[MAX_PORTS], uint32_t nsubframe, uint32_t cfi) {
|
|
|
|
|
|
|
|
|
|
|
|
/* Set pointers for layermapping & precoding */
|
|
|
|
/* Set pointers for layermapping & precoding */
|
|
|
|
int i;
|
|
|
|
uint32_t i;
|
|
|
|
cf_t *x[MAX_LAYERS];
|
|
|
|
cf_t *x[MAX_LAYERS];
|
|
|
|
|
|
|
|
|
|
|
|
if (q != NULL &&
|
|
|
|
if (q != NULL &&
|
|
|
|
llr != NULL &&
|
|
|
|
|
|
|
|
slot_symbols != NULL &&
|
|
|
|
|
|
|
|
nsubframe < 10 &&
|
|
|
|
nsubframe < 10 &&
|
|
|
|
cfi > 0 &&
|
|
|
|
cfi > 0 &&
|
|
|
|
cfi < 4)
|
|
|
|
cfi < 4)
|
|
|
|
@ -428,7 +381,7 @@ int pdcch_extract_llr(pdcch_t *q, cf_t *slot_symbols, cf_t *ce[MAX_PORTS],
|
|
|
|
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->cell.nof_ports));
|
|
|
|
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->cell.nof_ports));
|
|
|
|
|
|
|
|
|
|
|
|
/* extract symbols */
|
|
|
|
/* extract symbols */
|
|
|
|
int n = regs_pdcch_get(q->regs, slot_symbols, q->pdcch_symbols[0]);
|
|
|
|
int n = regs_pdcch_get(q->regs, sf_symbols, q->pdcch_symbols[0]);
|
|
|
|
if (q->nof_symbols != n) {
|
|
|
|
if (q->nof_symbols != n) {
|
|
|
|
fprintf(stderr, "Expected %d PDCCH symbols but got %d symbols\n",
|
|
|
|
fprintf(stderr, "Expected %d PDCCH symbols but got %d symbols\n",
|
|
|
|
q->nof_symbols, n);
|
|
|
|
q->nof_symbols, n);
|
|
|
|
@ -472,84 +425,18 @@ int pdcch_extract_llr(pdcch_t *q, cf_t *slot_symbols, cf_t *ce[MAX_PORTS],
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* descramble */
|
|
|
|
/* descramble */
|
|
|
|
scrambling_f_offset(&q->seq_pdcch[nsubframe], llr, 0, q->nof_bits);
|
|
|
|
scrambling_f_offset(&q->seq_pdcch[nsubframe], q->pdcch_llr, 0, q->nof_bits);
|
|
|
|
|
|
|
|
|
|
|
|
return LIBLTE_SUCCESS;
|
|
|
|
return LIBLTE_SUCCESS;
|
|
|
|
} else {
|
|
|
|
|
|
|
|
return LIBLTE_ERROR_INVALID_INPUTS;
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return LIBLTE_ERROR_INVALID_INPUTS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int pdcch_decode_current_mode(pdcch_t *q, float *llr, dci_t *dci, uint32_t subframe) {
|
|
|
|
|
|
|
|
int k, i;
|
|
|
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (q->current_search_mode == SEARCH_UE) {
|
|
|
|
|
|
|
|
k = subframe;
|
|
|
|
|
|
|
|
} else {
|
|
|
|
|
|
|
|
k = 0;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
for (i = 0;
|
|
|
|
|
|
|
|
i < q->search_mode[q->current_search_mode].nof_candidates
|
|
|
|
|
|
|
|
&& dci->nof_dcis < dci->max_dcis; i++) {
|
|
|
|
|
|
|
|
ret = pdcch_decode_candidate(q, q->pdcch_llr,
|
|
|
|
|
|
|
|
&q->search_mode[q->current_search_mode].candidates[k][i],
|
|
|
|
|
|
|
|
&dci->msg[dci->nof_dcis]);
|
|
|
|
|
|
|
|
if (ret == 1) {
|
|
|
|
|
|
|
|
dci->nof_dcis++;
|
|
|
|
|
|
|
|
} else if (ret == -1) {
|
|
|
|
|
|
|
|
return LIBLTE_ERROR;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return dci->nof_dcis;
|
|
|
|
|
|
|
|
}
|
|
|
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int pdcch_decode_si(pdcch_t *q, float *llr, dci_t *dci) {
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pdcch_set_search_si(q);
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return pdcch_decode_current_mode(q, llr, dci, 0);
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}
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int pdcch_decode_ra(pdcch_t *q, float *llr, dci_t *dci) {
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pdcch_set_search_ra(q);
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return pdcch_decode_current_mode(q, llr, dci, 0);
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}
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int pdcch_decode_ue(pdcch_t *q, float *llr, dci_t *dci, uint32_t nsubframe) {
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pdcch_set_search_ue(q);
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return pdcch_decode_current_mode(q, llr, dci, nsubframe);
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}
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/* Decodes PDCCH channels
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*
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* dci->nof_dcis is the size of the dci->msg buffer (ie max number of messages)
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*
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* Returns number of messages stored in dci
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*/
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int pdcch_decode(pdcch_t *q, cf_t *slot_symbols, cf_t *ce[MAX_PORTS],
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dci_t *dci, uint32_t subframe, uint32_t cfi) {
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if (q != NULL &&
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dci != NULL &&
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slot_symbols != NULL &&
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subframe < 10 &&
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cfi > 0 &&
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cfi < 4)
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{
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if (pdcch_extract_llr(q, slot_symbols, ce, q->pdcch_llr, subframe, cfi)) {
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return LIBLTE_ERROR;
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}
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if (q->current_search_mode != SEARCH_NONE) {
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return pdcch_decode_current_mode(q, q->pdcch_llr, dci, subframe);
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}
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return LIBLTE_SUCCESS;
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} else {
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return LIBLTE_ERROR_INVALID_INPUTS;
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}
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}
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void crc_set_mask_rnti(char *crc, uint16_t rnti) {
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static void crc_set_mask_rnti(char *crc, uint16_t rnti) {
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int i;
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uint32_t i;
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char mask[16];
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char mask[16];
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char *r = mask;
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char *r = mask;
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@ -564,7 +451,7 @@ void crc_set_mask_rnti(char *crc, uint16_t rnti) {
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/** 36.212 5.3.3.2 to 5.3.3.4
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/** 36.212 5.3.3.2 to 5.3.3.4
|
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* TODO: UE transmit antenna selection CRC mask
|
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* TODO: UE transmit antenna selection CRC mask
|
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*/
|
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*/
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int dci_encode(pdcch_t *q, char *data, char *e, uint32_t nof_bits, uint32_t E,
|
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static int dci_encode(pdcch_t *q, char *data, char *e, uint32_t nof_bits, uint32_t E,
|
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|
uint16_t rnti) {
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|
uint16_t rnti) {
|
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|
convcoder_t encoder;
|
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|
convcoder_t encoder;
|
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|
|
char tmp[3 * (DCI_MAX_BITS + 16)];
|
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char tmp[3 * (DCI_MAX_BITS + 16)];
|
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|
@ -600,16 +487,57 @@ int dci_encode(pdcch_t *q, char *data, char *e, uint32_t nof_bits, uint32_t E,
|
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|
}
|
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|
}
|
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|
}
|
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|
}
|
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|
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|
|
/** Converts the set of DCI messages to symbols mapped to the slot ready for transmission
|
|
|
|
void pdcch_reset(pdcch_t *q) {
|
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|
|
|
|
|
/* should add <NIL> elements? Or maybe random bits to facilitate power estimation */
|
|
|
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|
|
bzero(q->pdcch_e, q->nof_bits);
|
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|
|
}
|
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|
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|
|
|
/** Encodes ONE DCI message and allocates the encoded bits to the dci_location_t indicated by
|
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|
|
* the parameter location. The CRC is scrambled with the RNTI parameter.
|
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|
|
* This function can be called multiple times and encoded DCI messages will be stored in the
|
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|
|
|
|
|
|
* pdcch_t structure. A final call to the function pdcch_gen_symbols() will generate and map the
|
|
|
|
|
|
|
|
* symbols to the subframe for transmission.
|
|
|
|
|
|
|
|
* If the same location is provided in multiple messages, the encoded bits will be overwritten.
|
|
|
|
|
|
|
|
*
|
|
|
|
|
|
|
|
* @TODO: Use a bitmask and CFI to ensure message locations are valid and old messages are not overwritten.
|
|
|
|
*/
|
|
|
|
*/
|
|
|
|
int pdcch_encode(pdcch_t *q, dci_t *dci, cf_t *slot_symbols[MAX_PORTS],
|
|
|
|
int pdcch_encode_msg(pdcch_t *q, dci_msg_t *msg, dci_location_t location, uint16_t rnti) {
|
|
|
|
uint32_t nsubframe, uint32_t cfi) {
|
|
|
|
|
|
|
|
|
|
|
|
int ret = LIBLTE_ERROR_INVALID_INPUTS;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (q != NULL) {
|
|
|
|
|
|
|
|
ret = LIBLTE_ERROR;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (location.L < 4 &&
|
|
|
|
|
|
|
|
msg->nof_bits < DCI_MAX_BITS)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
INFO("Encoding DCI: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n",
|
|
|
|
|
|
|
|
msg->nof_bits,
|
|
|
|
|
|
|
|
PDCCH_FORMAT_NOF_BITS(location.L),
|
|
|
|
|
|
|
|
location.ncce, location.L, rnti);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
dci_encode(q, msg->data, &q->pdcch_e[72 * location.ncce], msg->nof_bits,
|
|
|
|
|
|
|
|
PDCCH_FORMAT_NOF_BITS(location.L), rnti);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ret = LIBLTE_SUCCESS;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
} else {
|
|
|
|
|
|
|
|
fprintf(stderr, "Illegal DCI message nCCE: %d, L: %d, nof_cce: %d\n",
|
|
|
|
|
|
|
|
location.ncce, location.L, q->nof_cce);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/** Converts the set of DCI messages encoded using the function pdcch_encode_msg()
|
|
|
|
|
|
|
|
* to symbols mapped to the subframe ready for transmission
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
int pdcch_gen_symbols(pdcch_t *q, cf_t *slot_symbols[MAX_PORTS], uint32_t nsubframe, uint32_t cfi) {
|
|
|
|
int i;
|
|
|
|
int i;
|
|
|
|
/* Set pointers for layermapping & precoding */
|
|
|
|
/* Set pointers for layermapping & precoding */
|
|
|
|
cf_t *x[MAX_LAYERS];
|
|
|
|
cf_t *x[MAX_LAYERS];
|
|
|
|
|
|
|
|
|
|
|
|
if (q != NULL &&
|
|
|
|
if (q != NULL &&
|
|
|
|
dci != NULL &&
|
|
|
|
|
|
|
|
slot_symbols != NULL &&
|
|
|
|
slot_symbols != NULL &&
|
|
|
|
nsubframe < 10 &&
|
|
|
|
nsubframe < 10 &&
|
|
|
|
cfi > 0 &&
|
|
|
|
cfi > 0 &&
|
|
|
|
@ -623,31 +551,6 @@ int pdcch_encode(pdcch_t *q, dci_t *dci, cf_t *slot_symbols[MAX_PORTS],
|
|
|
|
}
|
|
|
|
}
|
|
|
|
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->cell.nof_ports));
|
|
|
|
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->cell.nof_ports));
|
|
|
|
|
|
|
|
|
|
|
|
/* should add <NIL> elements? Or maybe random bits to facilitate power estimation */
|
|
|
|
|
|
|
|
bzero(q->pdcch_e, q->nof_bits);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Encode DCIs */
|
|
|
|
|
|
|
|
for (i = 0; i < dci->nof_dcis; i++) {
|
|
|
|
|
|
|
|
/* do some checks */
|
|
|
|
|
|
|
|
if (dci->msg[i].location.ncce + PDCCH_FORMAT_NOF_CCE(dci->msg[i].location.L)
|
|
|
|
|
|
|
|
> q->nof_cce || dci->msg[i].location.L > 3
|
|
|
|
|
|
|
|
|| dci->msg[i].location.nof_bits > DCI_MAX_BITS) {
|
|
|
|
|
|
|
|
fprintf(stderr, "Illegal DCI message nCCE: %d, L: %d, nof_cce: %d\n",
|
|
|
|
|
|
|
|
dci->msg[i].location.ncce, dci->msg[i].location.L, q->nof_cce);
|
|
|
|
|
|
|
|
return LIBLTE_ERROR;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
INFO("Encoding DCI %d: Nbits: %d, E: %d, nCCE: %d, L: %d, RNTI: 0x%x\n", i,
|
|
|
|
|
|
|
|
dci->msg[i].location.nof_bits,
|
|
|
|
|
|
|
|
PDCCH_FORMAT_NOF_BITS(dci->msg[i].location.L),
|
|
|
|
|
|
|
|
dci->msg[i].location.ncce, dci->msg[i].location.L,
|
|
|
|
|
|
|
|
dci->msg[i].location.rnti);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
dci_encode(q, dci->msg[i].data, &q->pdcch_e[72 * dci->msg[i].location.ncce],
|
|
|
|
|
|
|
|
dci->msg[i].location.nof_bits,
|
|
|
|
|
|
|
|
PDCCH_FORMAT_NOF_BITS(dci->msg[i].location.L),
|
|
|
|
|
|
|
|
dci->msg[i].location.rnti);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
scrambling_b_offset(&q->seq_pdcch[nsubframe], q->pdcch_e, 0, q->nof_bits);
|
|
|
|
scrambling_b_offset(&q->seq_pdcch[nsubframe], q->pdcch_e, 0, q->nof_bits);
|
|
|
|
|
|
|
|
|
|
|
|
mod_modulate(&q->mod, q->pdcch_e, q->pdcch_d, q->nof_bits);
|
|
|
|
mod_modulate(&q->mod, q->pdcch_e, q->pdcch_d, q->nof_bits);
|
|
|
|
@ -671,3 +574,4 @@ int pdcch_encode(pdcch_t *q, dci_t *dci, cf_t *slot_symbols[MAX_PORTS],
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ismagom
11 years ago