UE RRC paging handling

src/ue/nas/mm/interface.cpp

@@ -44,6 +44,11 @@ void NasMm::handleRrcEvent(const NwUeRrcToNas &msg)
     }
     case NwUeRrcToNas::SERVING_CELL_CHANGE: {
         handleServingCellChange(msg.servingCell);
+        break;
+    }
+    case NwUeRrcToNas::PAGING: {
+        handlePaging(msg.pagingTmsi);
+        break;
     }
     }
 }

src/ue/nas/mm/mm.hpp

@@ -152,6 +152,7 @@ class NasMm
     void handleRrcConnectionRelease();
     void handleServingCellChange(const UeCellInfo &servingCell);
     void handleRadioLinkFailure();
+    void handlePaging(const std::vector<GutiMobileIdentity> &tmsiIds);
 
   private: /* Access Control */
     bool isHighPriority();

src/ue/nas/mm/radio.cpp

@@ -228,4 +228,9 @@ void NasMm::localReleaseConnection()
     m_base->rrcTask->push(new NwUeNasToRrc(NwUeNasToRrc::LOCAL_RELEASE_CONNECTION));
 }
 
+void NasMm::handlePaging(const std::vector<GutiMobileIdentity> &tmsiIds)
+{
+    // TODO
+}
+
 } // namespace nr::ue
\ No newline at end of file

src/ue/nts.hpp

@@ -67,6 +67,7 @@ struct NwUeRrcToNas : NtsMessage
         RRC_CONNECTION_RELEASE,
         RADIO_LINK_FAILURE,
         SERVING_CELL_CHANGE,
+        PAGING,
     } present;
 
     // NAS_DELIVERY
@@ -78,6 +79,9 @@ struct NwUeRrcToNas : NtsMessage
     // SERVING_CELL_CHANGE
     UeCellInfo servingCell{};
 
+    // PAGING
+    std::vector<GutiMobileIdentity> pagingTmsi{};
+
     explicit NwUeRrcToNas(PR present) : NtsMessage(NtsMessageType::UE_RRC_TO_NAS), present(present)
     {
     }

src/ue/rrc/handler.cpp

@@ -15,6 +15,9 @@
 
 #include <asn/rrc/ASN_RRC_DLInformationTransfer-IEs.h>
 #include <asn/rrc/ASN_RRC_DLInformationTransfer.h>
+#include <asn/rrc/ASN_RRC_Paging.h>
+#include <asn/rrc/ASN_RRC_PagingRecord.h>
+#include <asn/rrc/ASN_RRC_PagingRecordList.h>
 #include <asn/rrc/ASN_RRC_RRCSetup-IEs.h>
 #include <asn/rrc/ASN_RRC_RRCSetup.h>
 #include <asn/rrc/ASN_RRC_RRCSetupComplete-IEs.h>
@@ -133,8 +136,26 @@ void UeRrcTask::receiveRrcRelease(const ASN_RRC_RRCRelease &msg)
 
 void UeRrcTask::receivePaging(const ASN_RRC_Paging &msg)
 {
-    // TODO
-    m_logger->err("Paging received");
+    std::vector<GutiMobileIdentity> tmsiIds{};
+
+    asn::ForeachItem(*msg.pagingRecordList, [&tmsiIds](auto &pagingRecord) {
+        if (pagingRecord.ue_Identity.present == ASN_RRC_PagingUE_Identity_PR_ng_5G_S_TMSI)
+        {
+            auto recordTmsi = asn::GetOctetString(pagingRecord.ue_Identity.choice.ng_5G_S_TMSI);
+            auto tmsiOs = BitBuffer{recordTmsi.data()};
+
+            GutiMobileIdentity tmsi{};
+            tmsi.amfSetId = tmsiOs.readBits(10);
+            tmsi.amfPointer = tmsiOs.readBits(6);
+            tmsi.tmsi = octet4{static_cast<uint32_t>(tmsiOs.readBitsLong(32) & 0xFFFFFFFFu)};
+
+            tmsiIds.push_back(tmsi);
+        }
+    });
+
+    auto *w = new NwUeRrcToNas(NwUeRrcToNas::PAGING);
+    w->pagingTmsi = std::move(tmsiIds);
+    m_base->nasTask->push(w);
 }
 
 } // namespace nr::ue
\ No newline at end of file