diff --git a/src/profiling/ActivateTimelineReportingCommandHandler.cpp b/src/profiling/ActivateTimelineReportingCommandHandler.cpp
new file mode 100644
index 0000000..d762efc
--- /dev/null
+++ b/src/profiling/ActivateTimelineReportingCommandHandler.cpp
@@ -0,0 +1,63 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "ActivateTimelineReportingCommandHandler.hpp"
+#include "TimelineUtilityMethods.hpp"
+
+#include <armnn/Exceptions.hpp>
+#include <boost/format.hpp>
+
+namespace armnn
+{
+
+namespace profiling
+{
+
+void ActivateTimelineReportingCommandHandler::operator()(const Packet& packet)
+{
+    ProfilingState currentState = m_StateMachine.GetCurrentState();
+
+    if (!m_ReportStructure.has_value())
+    {
+            throw armnn::Exception(std::string("Profiling Service constructor must be initialised with an "
+                                               "IReportStructure argument in order to run timeline reporting"));
+    }
+
+    switch ( currentState )
+    {
+        case ProfilingState::Uninitialised:
+        case ProfilingState::NotConnected:
+        case ProfilingState::WaitingForAck:
+            throw RuntimeException(boost::str(
+                boost::format("Activate Timeline Reporting Command Handler invoked while in a wrong state: %1%")
+                    % GetProfilingStateName(currentState)));
+        case ProfilingState::Active:
+            if ( !( packet.GetPacketFamily() == 0u && packet.GetPacketId() == 6u ))
+            {
+                throw armnn::Exception(std::string("Expected Packet family = 0, id = 6 but received family =")
+                                           + std::to_string(packet.GetPacketFamily())
+                                           + " id = " + std::to_string(packet.GetPacketId()));
+            }
+
+            m_SendTimelinePacket.SendTimelineMessageDirectoryPackage();
+
+            TimelineUtilityMethods::SendWellKnownLabelsAndEventClasses(m_SendTimelinePacket);
+
+            m_TimelineReporting = true;
+
+            m_ReportStructure.value().ReportStructure();
+
+            m_BackendNotifier.NotifyBackendsForTimelineReporting();
+
+            break;
+        default:
+            throw RuntimeException(boost::str(boost::format("Unknown profiling service state: %1%")
+                                                  % static_cast<int>(currentState)));
+    }
+}
+
+} // namespace profiling
+
+} // namespace armnn
\ No newline at end of file