RRC developments

src/ue/rrc/cells.cpp

@@ -9,14 +9,53 @@
 #include "task.hpp"
 #include <lib/rrc/encode.hpp>
 #include <ue/nas/task.hpp>
-#include <ue/nts.hpp>
 
 namespace nr::ue
 {
 
 void UeRrcTask::handleCellSignalChange(int cellId, int dbm)
 {
-    // TODO
+    bool considerLost = dbm < -120;
+
+    if (!m_cellDesc.count(cellId))
+    {
+        if (!considerLost)
+            notifyCellDetected(cellId, dbm);
+    }
+    else
+    {
+        if (considerLost)
+            notifyCellLost(cellId);
+        else
+            m_cellDesc[cellId].dbm = dbm;
+    }
+}
+
+void UeRrcTask::notifyCellDetected(int cellId, int dbm)
+{
+    m_cellDesc[cellId] = {};
+    m_cellDesc[cellId].dbm = dbm;
+
+    m_logger->debug("New signal detected for cell[%d], total [%d] cells in coverage", cellId,
+                    static_cast<int>(m_cellDesc.size()));
+}
+
+void UeRrcTask::notifyCellLost(int cellId)
+{
+    if (!m_cellDesc.count(cellId))
+        return;
+
+    m_cellDesc.erase(cellId);
+
+    m_logger->debug("Signal lost for cell[%d], total [%d] cells in coverage", cellId,
+                    static_cast<int>(m_cellDesc.size()));
+
+    // TODO: handle other operations
+}
+
+bool UeRrcTask::hasSignalToCell(int cellId)
+{
+    return m_cellDesc.count(cellId);
 }
 
 } // namespace nr::ue

src/ue/rrc/channel.cpp

@@ -21,6 +21,9 @@ namespace nr::ue
 
 void UeRrcTask::handleDownlinkRrc(int cellId, rrc::RrcChannel channel, const OctetString &rrcPdu)
 {
+    if (!hasSignalToCell(cellId))
+        return;
+
     switch (channel)
     {
     case rrc::RrcChannel::BCCH_BCH: {

src/ue/rrc/rls_sap.cpp

@@ -10,7 +10,6 @@
 #include <lib/rrc/encode.hpp>
 #include <ue/nas/task.hpp>
 #include <ue/nts.hpp>
-#include <utils/common.hpp>
 
 namespace nr::ue
 {

src/ue/rrc/task.hpp

@@ -8,15 +8,17 @@
 
 #pragma once
 
-#include <asn/rrc/ASN_RRC_InitialUE-Identity.h>
 #include <memory>
 #include <thread>
+#include <unordered_map>
+#include <vector>
+
 #include <ue/nts.hpp>
 #include <ue/types.hpp>
-#include <unordered_map>
 #include <utils/logger.hpp>
 #include <utils/nts.hpp>
-#include <vector>
+
+#include <asn/rrc/ASN_RRC_InitialUE-Identity.h>
 
 extern "C"
 {
@@ -53,6 +55,8 @@ class UeRrcTask : public NtsTask
     ASN_RRC_InitialUE_Identity_t m_initialId{};
     OctetString m_initialNasPdu{};
 
+    std::unordered_map<int, UeCellDesc> m_cellDesc{};
+
     friend class UeCmdHandler;
 
   public:
@@ -94,6 +98,9 @@ class UeRrcTask : public NtsTask
 
     /* Cell Management */
     void handleCellSignalChange(int cellId, int dbm);
+    void notifyCellDetected(int cellId, int dbm);
+    void notifyCellLost(int cellId);
+    bool hasSignalToCell(int cellId);
 };
 
 } // namespace nr::ue

src/ue/types.hpp

@@ -29,6 +29,11 @@ class UeRrcTask;
 class UeRlsTask;
 class UserEquipment;
 
+struct UeCellDesc
+{
+    int dbm{};
+};
+
 struct SupportedAlgs
 {
     bool nia1 = true;