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rrc_handle_RRCReestablishmentRequest(): refactor to have single block for RRC Setup

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This commit is contained in:
Robert Schmidt
2024-02-03 11:24:41 +01:00
parent f6a783344f
commit 674d9bcd8a
1 changed files with 34 additions and 33 deletions
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openair2/RRC/NR/rrc_gNB.c
+34 -33
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@@ -1261,22 +1261,27 @@ static void rrc_handle_RRCSetupRequest(gNB_RRC_INST *rrc, sctp_assoc_t assoc_id,
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
}
static const char *get_reestab_cause(NR_ReestablishmentCause_t c)
{
switch (c) {
case NR_ReestablishmentCause_otherFailure:
return "Other Failure";
case NR_ReestablishmentCause_handoverFailure:
return "Handover Failure";
case NR_ReestablishmentCause_reconfigurationFailure:
return "Reconfiguration Failure";
default:
break;
}
return "UNKNOWN Failure (ASN.1 decoder error?)";
}
static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t assoc_id, const NR_RRCReestablishmentRequest_IEs_t *req, const f1ap_initial_ul_rrc_message_t *msg)
{
/* in case we need to do RRC Setup, give the UE a new random identity */
uint64_t random_value;
fill_random(&random_value, sizeof(random_value));
random_value = random_value & 0x7fffffffff; /* random value is 39 bits */
const NR_ReestablishmentCause_t cause = req->reestablishmentCause;
uint64_t random_value = 0;
const char *scause = get_reestab_cause(req->reestablishmentCause);
const long physCellId = req->ue_Identity.physCellId;
LOG_I(NR_RRC,
"UE %04x physCellId %ld NR_RRCReestablishmentRequest cause %s\n",
msg->crnti,
physCellId,
cause == NR_ReestablishmentCause_otherFailure
? "Other Failure"
: (cause == NR_ReestablishmentCause_handoverFailure ? "Handover Failure" : "reconfigurationFailure"));
LOG_D(NR_RRC, "UE %04x physCellId %ld NR_RRCReestablishmentRequest cause %s\n", msg->crnti, physCellId, scause);
const nr_rrc_du_container_t *du = get_du_by_assoc_id(rrc, assoc_id);
if (du == NULL) {
@@ -1289,19 +1294,14 @@ static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t
* Reestablishment (as we would need the SSB's ARFCN, which we cannot
* compute). So generate RRC Setup instead */
LOG_E(NR_RRC, "Reestablishment request: no MIB/SIB1 of DU present, cannot do reestablishment, force setup request\n");
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
ue_context_p->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
goto fallback_rrc_setup;
}
rnti_t old_rnti = req->ue_Identity.c_RNTI;
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_get_ue_context_by_rnti(rrc, assoc_id, old_rnti);
if (ue_context_p == NULL) {
LOG_E(NR_RRC, "NR_RRCReestablishmentRequest without UE context, fallback to RRC setup\n");
ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
ue_context_p->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
return;
goto fallback_rrc_setup;
}
const f1ap_served_cell_info_t *cell_info = &du->setup_req->cell[0].info;
@@ -1315,10 +1315,7 @@ static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t
* one, the gNB-CU should trigger the UE Context Setup procedure". Let's
* assume that the old DU will trigger a release request, also freeing the
* ongoing context at the CU. Hence, create new below */
rrc_gNB_ue_context_t *new = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
new->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, new, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
return;
goto fallback_rrc_setup;
}
gNB_RRC_UE_t *UE = &ue_context_p->ue_context;
@@ -1328,19 +1325,13 @@ static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t
LOG_E(NR_RRC,
"NR_RRCReestablishmentRequest c_RNTI %04lx range error, fallback to RRC setup\n",
req->ue_Identity.c_RNTI);
ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
ue_context_p->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
return;
goto fallback_rrc_setup;
}
if (!UE->as_security_active) {
/* no active security context, need to restart entire connection */
LOG_E(NR_RRC, "UE requested Reestablishment without activated AS security\n");
ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
ue_context_p->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
return;
goto fallback_rrc_setup;
}
/* TODO: start timer in ITTI and drop UE if it does not come back */
@@ -1351,9 +1342,19 @@ static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t
f1_ue_data_t ue_data = {.secondary_ue = msg->gNB_DU_ue_id, .du_assoc_id = assoc_id};
cu_add_f1_ue_data(UE->rrc_ue_id, &ue_data);
LOG_D(NR_RRC, "Accept req-> UE physCellId %ld cause %ld\n", physCellId, cause);
LOG_I(NR_RRC, "Accept Reestablishment Request UE physCellId %ld cause %s\n", physCellId, scause);
rrc_gNB_generate_RRCReestablishment(ue_context_p, msg->du2cu_rrc_container, old_rnti, du);
return;
fallback_rrc_setup:
fill_random(&random_value, sizeof(random_value));
random_value = random_value & 0x7fffffffff; /* random value is 39 bits */
rrc_gNB_ue_context_t *new = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
new->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, new, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
return;
}
/*! \fn uint64_t bitStr_to_uint64(BIT_STRING_t *)