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Commit 2bdcbe6c authored by Francesco Mani's avatar Francesco Mani Committed by Robert Schmidt
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Fix for filling vrb_map for ssb 

The SSB nFAPI message is only sent every 8 frames, and automatically
repeated by the PHY layer in between. This commit sets the vrb_map
structure in those frames in between nFAPI so that the scheduler does
not schedule on such resources.
parent a94da10d
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Showing with 126 additions and 84 deletions
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c
View file @ 2bdcbe6c
......@@ -447,9 +447,7 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
if ((slot == 0) && (frame & 127) == 0) dump_mac_stats(RC.nrmac[module_idP]);
// This schedules MIB
if((slot == 0) && (frame & 7) == 0){
schedule_nr_mib(module_idP, frame, slot);
}
schedule_nr_mib(module_idP, frame, slot, slots_per_frame[*scc->ssbSubcarrierSpacing]);
// This schedule PRACH if we are not in phy_test mode
if (get_softmodem_params()->phy_test == 0)
......
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c
View file @ 2bdcbe6c
......@@ -56,7 +56,7 @@
extern RAN_CONTEXT_t RC;
extern uint8_t SSB_Table[38];
void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP){
void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP, uint8_t slots_per_frame){
gNB_MAC_INST *gNB = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc;
......@@ -67,24 +67,43 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP){
int mib_sdu_length;
int CC_id;
AssertFatal(slotP == 0, "Subframe must be 0\n");
AssertFatal((frameP & 7) == 0, "Frame must be a multiple of 8\n");
for (CC_id = 0; CC_id < MAX_NUM_CCs; CC_id++) {
cc = &gNB->common_channels[CC_id];
const long band = *cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0];
const uint32_t ssb_offset0 = *cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA;
int ratio;
switch (*cc->ServingCellConfigCommon->ssbSubcarrierSpacing) {
case NR_SubcarrierSpacing_kHz15:
AssertFatal(band <= 79, "Band %ld is not possible for SSB with 15 kHz SCS\n",band);
if (band<77) // below 3GHz
ratio=3; // NRARFCN step is 5 kHz
else
ratio=1; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz30:
AssertFatal(band <= 79, "Band %ld is not possible for SSB with 15 kHz SCS\n",band);
if (band<77) // below 3GHz
ratio=6; // NRARFCN step is 5 kHz
else
ratio=2; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz120:
AssertFatal(band >= 257, "Band %ld is not possible for SSB with 120 kHz SCS\n",band);
ratio=2; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz240:
AssertFatal(band >= 257, "Band %ld is not possible for SSB with 240 kHz SCS\n",band);
ratio=4; // NRARFCN step is 15 kHz
break;
default:
AssertFatal(1==0,"SCS %ld not allowed for SSB \n", *cc->ServingCellConfigCommon->ssbSubcarrierSpacing);
}
nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0];
// scheduling MIB every 8 frames, PHY repeats it in between
if((slotP == 0) && (frameP & 7) == 0) {
dl_tti_request = &gNB->DL_req[CC_id];
dl_req = &dl_tti_request->dl_tti_request_body;
cc = &gNB->common_channels[CC_id];
#if 0
//SSB is transmitted based on SSB periodicity
if((frameP % cfg->ssb_table.ssb_period.value) == 0) {
uint64_t L_ssb = (((uint64_t) cfg->ssb_table.ssb_mask_list[0].ssb_mask.value)<<32) | cfg->ssb_table.ssb_mask_list[1].ssb_mask.value ;
uint32_t ssb_index = -1;
for (int i=0; i<2; i++) { // max two SSB per slot
ssb_index = i + SSB_Table[slotP]; // computing the ssb_index
if ((ssb_index<64) && ((L_ssb >> (63-ssb_index)) & 0x01)) { // generating the ssb only if the bit of L_ssb at current ssb index is 1
#endif
mib_sdu_length = mac_rrc_nr_data_req(module_idP, CC_id, frameP, MIBCH, 1, &cc->MIB_pdu.payload[0]); // not used in this case
......@@ -106,54 +125,77 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP){
AssertFatal(cc->ServingCellConfigCommon->physCellId!=NULL,"cc->ServingCellConfigCommon->physCellId is null\n");
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.PhysCellId = *cc->ServingCellConfigCommon->physCellId;
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.BetaPss = 0;
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.SsbBlockIndex = 0;//ssb_index ;//SSB index for each SSB
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.SsbBlockIndex = 0;
AssertFatal(cc->ServingCellConfigCommon->downlinkConfigCommon!=NULL,"scc->downlinkConfigCommonL is null\n");
AssertFatal(cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL!=NULL,"scc->downlinkConfigCommon->frequencyInfoDL is null\n");
AssertFatal(cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB!=NULL,"scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB is null\n");
AssertFatal(cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.count==1,"Frequency Band list does not have 1 element (%d)\n",cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.count);
AssertFatal(cc->ServingCellConfigCommon->ssbSubcarrierSpacing,"ssbSubcarrierSpacing is null\n");
AssertFatal(cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0],"band is null\n");
long band = *cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0];
uint32_t ssb_offset0 = *cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - cc->ServingCellConfigCommon->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA;
int ratio;
switch (*cc->ServingCellConfigCommon->ssbSubcarrierSpacing) {
case NR_SubcarrierSpacing_kHz15:
AssertFatal(band <= 79, "Band %ld is not possible for SSB with 15 kHz SCS\n",band);
if (band<77) // below 3GHz
ratio=3; // NRARFCN step is 5 kHz
else
ratio=1; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz30:
AssertFatal(band <= 79, "Band %ld is not possible for SSB with 15 kHz SCS\n",band);
if (band<77) // below 3GHz
ratio=6; // NRARFCN step is 5 kHz
else
ratio=2; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz120:
AssertFatal(band >= 257, "Band %ld is not possible for SSB with 120 kHz SCS\n",band);
ratio=2; // NRARFCN step is 15 kHz
break;
case NR_SubcarrierSpacing_kHz240:
AssertFatal(band >= 257, "Band %ld is not possible for SSB with 240 kHz SCS\n",band);
ratio=4; // NRARFCN step is 15 kHz
break;
default:
AssertFatal(1==0,"SCS %ld not allowed for SSB \n", *cc->ServingCellConfigCommon->ssbSubcarrierSpacing);
}
const nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0];
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.SsbSubcarrierOffset = cfg->ssb_table.ssb_subcarrier_offset.value; //kSSB
dl_config_pdu->ssb_pdu.ssb_pdu_rel15.ssbOffsetPointA = ssb_offset0/(ratio*12) - 10;/*cfg->ssb_table.ssb_offset_point_a.value;*/ // absoluteFrequencySSB is the center of SSB
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++;
}
}
uint8_t *vrb_map = cc[CC_id].vrb_map;
const int rbStart = dl_config_pdu->ssb_pdu.ssb_pdu_rel15.ssbOffsetPointA;
for (int rb = 0; rb < 20; rb++)
vrb_map[rbStart + rb] = 1;
// checking if there is any SSB in slot
const int abs_slot = (slots_per_frame * frameP) + slotP;
const int slot_per_period = (slots_per_frame>>1)<<(*cc->ServingCellConfigCommon->ssb_periodicityServingCell);
int eff_120_slot;
switch (cc->ServingCellConfigCommon->ssb_PositionsInBurst->present) {
case 1 :
// presence of ssbs possible in the first 2 slots of ssb period
if ((abs_slot%slot_per_period)<2){
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[0])>>(6-(slotP<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
break;
case 2 :
// presence of ssbs possible in the first 4 slots of ssb period
if ((abs_slot%slot_per_period)<4){
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[0])>>(6-(slotP<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
break;
case 3 :
if(*cc->ServingCellConfigCommon->ssbSubcarrierSpacing == NR_SubcarrierSpacing_kHz120){
if ((abs_slot%slot_per_period)<8){
eff_120_slot = slotP;
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[0])>>(6-(eff_120_slot<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
else if ((abs_slot%slot_per_period)<17){
eff_120_slot = slotP-9;
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[1])>>(6-(eff_120_slot<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
else if ((abs_slot%slot_per_period)<26){
eff_120_slot = slotP-18;
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[2])>>(6-(eff_120_slot<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
else if ((abs_slot%slot_per_period)<35){
eff_120_slot = slotP-27;
if((((cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap.buf[3])>>(6-(eff_120_slot<<1)))&3)!=0)
fill_ssb_vrb_map(cc, (ssb_offset0/(ratio*12) - 10), CC_id);
}
}
else
AssertFatal(1==0,"240kHZ subcarrier spacing currently not supported for SSBs\n");
break;
default:
AssertFatal(1==0,"SSB bitmap size value %d undefined (allowed values 1,2,3) \n", cc->ServingCellConfigCommon->ssb_PositionsInBurst->present);
}
}
}
void fill_ssb_vrb_map (NR_COMMON_channels_t *cc, int rbStart, int CC_id) {
uint8_t *vrb_map = cc[CC_id].vrb_map;
for (int rb = 0; rb < 20; rb++)
vrb_map[rbStart + rb] = 1;
}
openair2/LAYER2/NR_MAC_gNB/mac_proto.h
View file @ 2bdcbe6c
......@@ -86,7 +86,7 @@ void nr_simple_dlsch_preprocessor(module_id_t module_id,
sub_frame_t slot,
int num_slots_per_tdd);
void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP);
void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP, uint8_t slots_per_frame);
/////// Random Access MAC-PHY interface functions and primitives ///////
......@@ -374,6 +374,8 @@ int binomial(int n, int k);
bool is_xlsch_in_slot(uint64_t bitmap, sub_frame_t slot);
void fill_ssb_vrb_map (NR_COMMON_channels_t *cc, int rbStart, int CC_id);
/* \brief Function to indicate a received SDU on ULSCH.
@param Mod_id Instance ID of gNB
......
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