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fix for ssb subcarrier offset in case of <3GHz

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This commit is contained in:
francescomani
2022-07-22 17:01:47 +02:00
parent 72bf1b1d3c
commit 228bd5f16d
2 changed files with 2 additions and 2 deletions
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openair2/LAYER2/NR_MAC_gNB/config.c
+1 -1
View File
@@ -337,7 +337,7 @@ void config_common(int Mod_idP, int pdsch_AntennaPorts, int pusch_AntennaPorts,
// SSB Table Configuration
uint32_t absolute_diff = (*scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA);
const int scaling_5khz = scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA < 600000 ? 3 : 1;
int sco = (absolute_diff*scaling_5khz) % 24;
int sco = (absolute_diff/scaling_5khz) % 24;
if(frequency_range == FR2)
sco >>= 1; // this assumes 120kHz SCS for SSB and subCarrierSpacingCommon (only option supported by OAI for
const int scs_scaling = frequency_range == FR2 ? 1 << (*scc->ssbSubcarrierSpacing - 2) : 1 << *scc->ssbSubcarrierSpacing;
openair2/RRC/NR/MESSAGES/asn1_msg.c
+1 -1
View File
@@ -230,7 +230,7 @@ uint8_t do_MIB_NR(gNB_RRC_INST *rrc,uint32_t frame) {
if (get_softmodem_params()->sa) {
uint32_t absolute_diff = (*scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencySSB - scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA);
int scs_scaling = scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA < 600000 ? 3 : 1;
ssb_subcarrier_offset = (absolute_diff*scs_scaling)%24;
ssb_subcarrier_offset = (absolute_diff/scs_scaling)%24;
if(frequency_range == FR2)
ssb_subcarrier_offset >>= 1; // this assumes 120kHz SCS for SSB and subCarrierSpacingCommon (only option supported by OAI for now)
}