maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

UE: Fix if target cell has SSB at a different offset as in source cell

Browse Source 
Actual problem is that SYNC does not happen on the target cell as frame parameters is not updated
and ssb start carrier is not correct in the UE frame parameters
function nr_get_ssb_start_sc to determine ssb_start_subcarrier
This commit is contained in:
Raghavendra Dinavahi
2026-03-02 15:49:12 +01:00
parent 46b7670672
commit 757a3131a1
6 changed files with 61 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/LAYER2/NR_MAC_UE/config_ue.c
+11 -10
View File
@@ -537,16 +537,15 @@ static void config_common_ue(NR_UE_MAC_INST_t *mac, NR_ServingCellConfigCommon_t
// SSB Table config
if (frequencyInfoDL && frequencyInfoDL->absoluteFrequencySSB) {
int scs_scaling = 1 << (cfg->ssb_config.scs_common);
if (frequencyInfoDL->absoluteFrequencyPointA < 600000)
scs_scaling = scs_scaling * 3;
if (frequencyInfoDL->absoluteFrequencyPointA > 2016666)
scs_scaling = scs_scaling >> 2;
uint32_t absolute_diff = (*frequencyInfoDL->absoluteFrequencySSB - frequencyInfoDL->absoluteFrequencyPointA);
cfg->ssb_table.ssb_offset_point_a = absolute_diff / (12 * scs_scaling) - 10;
cfg->ssb_table.ssb_offset_point_a = get_ssb_offset_to_pointA(*frequencyInfoDL->absoluteFrequencySSB,
frequencyInfoDL->absoluteFrequencyPointA,
cfg->ssb_config.scs_common,
mac->frequency_range);
cfg->ssb_table.ssb_period = *scc->ssb_periodicityServingCell;
// NSA -> take ssb offset from SCS
cfg->ssb_table.ssb_subcarrier_offset = absolute_diff % (12 * scs_scaling);
cfg->ssb_table.ssb_subcarrier_offset = get_ssb_subcarrier_offset(*frequencyInfoDL->absoluteFrequencySSB,
frequencyInfoDL->absoluteFrequencyPointA,
cfg->ssb_config.scs_common);
cfg->ssb_table.ssb_case = set_ssb_case(*scc->ssbSubcarrierSpacing, mac->nr_band);
}
@@ -2113,12 +2112,14 @@ static void handle_reconfiguration_with_sync(NR_UE_MAC_INST_t *mac,
ra->ra_state = nrRA_UE_IDLE;
nr_ue_mac_default_configs(mac);
// PHY CONFIG request should be sent, ahead of SYNC request
// As SYNC request processes the new config
mac->if_module->phy_config_request(&mac->phy_config);
mac->phy_config.config_req.ntn_config.params_changed = false;
mac->synch_request.Mod_id = mac->ue_id;
mac->synch_request.CC_id = cc_idP;
mac->synch_request.synch_req.target_Nid_cell = mac->physCellId;
mac->if_module->synch_request(&mac->synch_request);
mac->if_module->phy_config_request(&mac->phy_config);
mac->phy_config.config_req.ntn_config.params_changed = false;
}
static void configure_physicalcellgroup(NR_UE_MAC_INST_t *mac,