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UE Context Modification Required: add RRC handler

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This commit is contained in:
Robert Schmidt
2023-08-14 16:25:02 +02:00
parent e72fa6aa39
commit 6337951182
1 changed files with 69 additions and 0 deletions
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openair2/RRC/NR/rrc_gNB.c
+69
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@@ -1189,6 +1189,7 @@ int nr_rrc_reconfiguration_req(rrc_gNB_ue_context_t *const ue_context_pP
uint8_t xid = rrc_gNB_get_next_transaction_identifier(ctxt_pP->module_id);
gNB_RRC_UE_t *ue_p = &ue_context_pP->ue_context;
ue_p->xids[xid] = RRC_DEDICATED_RECONF;
NR_CellGroupConfig_t *masterCellGroup = ue_p->masterCellGroup;
if (dl_bwp_id > 0) {
@@ -1681,6 +1682,7 @@ static void handle_rrcReconfigurationComplete(const protocol_ctxt_t *const ctxt_
rrc_gNB_send_NGAP_INITIAL_CONTEXT_SETUP_RESP(ctxt_pP, ue_context_p);
break;
case RRC_REESTABLISH_COMPLETE:
case RRC_DEDICATED_RECONF:
/* do nothing */
break;
default:
@@ -2101,6 +2103,69 @@ static void rrc_CU_process_ue_context_modification_response(MessageDef *msg_p, i
}
}
static void rrc_CU_process_ue_modification_required(MessageDef *msg_p)
{
f1ap_ue_context_modif_required_t *required = &F1AP_UE_CONTEXT_MODIFICATION_REQUIRED(msg_p);
protocol_ctxt_t ctxt = {.rntiMaybeUEid = required->gNB_CU_ue_id, .module_id = 0, .instance = 0, .enb_flag = 1, .eNB_index = 0};
gNB_RRC_INST *rrc = RC.nrrrc[ctxt.module_id];
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_get_ue_context(rrc, required->gNB_CU_ue_id);
if (ue_context_p == NULL) {
LOG_E(RRC, "Could not find UE context for CU UE ID %d, cannot handle UE context modification request\n", required->gNB_CU_ue_id);
f1ap_ue_context_modif_refuse_t refuse = {
.gNB_CU_ue_id = required->gNB_CU_ue_id,
.gNB_DU_ue_id = required->gNB_DU_ue_id,
.cause = F1AP_CAUSE_RADIO_NETWORK,
.cause_value = F1AP_CauseRadioNetwork_unknown_or_already_allocated_gnb_cu_ue_f1ap_id,
};
rrc->mac_rrc.ue_context_modification_refuse(&refuse);
return;
}
if (required->du_to_cu_rrc_information && required->du_to_cu_rrc_information->cellGroupConfig) {
gNB_RRC_UE_t *UE = &ue_context_p->ue_context;
LOG_I(RRC,
"UE Context Modification Required: new CellGroupConfig for UE ID %d/RNTI %04x, triggering reconfiguration\n",
UE->rrc_ue_id,
UE->rnti);
NR_CellGroupConfig_t *cellGroupConfig = NULL;
asn_dec_rval_t dec_rval = uper_decode_complete(NULL,
&asn_DEF_NR_CellGroupConfig,
(void **)&cellGroupConfig,
(uint8_t *)required->du_to_cu_rrc_information->cellGroupConfig,
required->du_to_cu_rrc_information->cellGroupConfig_length);
if (dec_rval.code != RC_OK && dec_rval.consumed == 0) {
LOG_E(RRC, "Cell group config decode error, refusing reconfiguration\n");
f1ap_ue_context_modif_refuse_t refuse = {
.gNB_CU_ue_id = required->gNB_CU_ue_id,
.gNB_DU_ue_id = required->gNB_DU_ue_id,
.cause = F1AP_CAUSE_PROTOCOL,
.cause_value = F1AP_CauseProtocol_transfer_syntax_error,
};
rrc->mac_rrc.ue_context_modification_refuse(&refuse);
return;
}
if (UE->masterCellGroup) {
ASN_STRUCT_FREE(asn_DEF_NR_CellGroupConfig, UE->masterCellGroup);
LOG_I(RRC, "UE %d/RNTI %04x replacing existing CellGroupConfig with new one received from DU\n", UE->rrc_ue_id, UE->rnti);
}
UE->masterCellGroup = cellGroupConfig;
if (LOG_DEBUGFLAG(DEBUG_ASN1))
xer_fprint(stdout, &asn_DEF_NR_CellGroupConfig, UE->masterCellGroup);
/* trigger reconfiguration */
nr_rrc_reconfiguration_req(ue_context_p, &ctxt, 0, 0);
//rrc_gNB_generate_dedicatedRRCReconfiguration(&ctxt, ue_context_p);
//rrc_gNB_generate_defaultRRCReconfiguration(&ctxt, ue_context_p);
return;
}
LOG_W(RRC,
"nothing to be done after UE Context Modification Required for UE ID %d/RNTI %04x\n",
required->gNB_CU_ue_id,
required->gNB_DU_ue_id);
}
unsigned int mask_flip(unsigned int x) {
return((((x>>8) + (x<<8))&0xffff)>>6);
}
@@ -2568,6 +2633,10 @@ void *rrc_gnb_task(void *args_p) {
rrc_CU_process_ue_context_modification_response(msg_p, instance);
break;
case F1AP_UE_CONTEXT_MODIFICATION_REQUIRED:
rrc_CU_process_ue_modification_required(msg_p);
break;
case F1AP_UE_CONTEXT_RELEASE_REQ:
rrc_CU_process_ue_context_release_request(msg_p);
break;