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absoluteFrequencySSB is the center of SSB (correction of 10 RB in ref to point A needed)

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This commit is contained in:
Francesco Mani
2020-02-03 12:30:45 +01:00
parent cef2ed8dda
commit 1b8e18e05b
3 changed files with 3 additions and 3 deletions
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openair2/LAYER2/NR_MAC_UE/config_ue.c
+1 -1
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@@ -221,7 +221,7 @@ void config_common_ue(NR_UE_MAC_INST_t *mac,
if (scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA > 2016666)
scs_scaling = scs_scaling>>2;
uint32_t absolute_diff = (*scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA);
cfg->ssb_table.ssb_offset_point_a = absolute_diff/(12*scs_scaling);
cfg->ssb_table.ssb_offset_point_a = absolute_diff/(12*scs_scaling) - 10;
cfg->ssb_table.ssb_period = *scc->ssb_periodicityServingCell;
cfg->ssb_table.ssb_subcarrier_offset = 0; // TODO currently not in RRC?
switch (scc->ssb_PositionsInBurst->present) {
openair2/LAYER2/NR_MAC_gNB/config.c
+1 -1
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@@ -207,7 +207,7 @@ void config_common(int Mod_idP, int pdsch_AntennaPorts, NR_ServingCellConfigComm
if (scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA > 2016666)
scs_scaling = scs_scaling>>2;
uint32_t absolute_diff = (*scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA);
cfg->ssb_table.ssb_offset_point_a.value = absolute_diff/(12*scs_scaling);
cfg->ssb_table.ssb_offset_point_a.value = absolute_diff/(12*scs_scaling) - 10; //absoluteFrequencySSB is the central frequency of SSB which is made by 20RBs in total
cfg->ssb_table.ssb_offset_point_a.tl.tag = NFAPI_NR_CONFIG_SSB_OFFSET_POINT_A_TAG;
cfg->num_tlv++;
cfg->ssb_table.ssb_period.value = *scc->ssb_periodicityServingCell;
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c
+1 -1
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@@ -135,7 +135,7 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP){
AssertFatal(1==0,"SCS %ld not allowed for SSB \n", *cc->ServingCellConfigCommon->ssbSubcarrierSpacing);
}
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.SsbSubcarrierOffset = 0; //kSSB
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.ssbOffsetPointA = ssb_offset0/(ratio*12);
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.ssbOffsetPointA = ssb_offset0/(ratio*12) - 10; // absoluteFrequencySSB is the center of SSB
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.bchPayloadFlag = 1;
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.bchPayload = (*(uint32_t*)cc->MIB_pdu.payload) & ((1<<24)-1);
dl_req->nPDUs++;