gnb,ngap: Add basic handler for NGAP Paging

srsgnb/hdr/stack/ngap/ngap.h

@@ -74,7 +74,7 @@ public:
 
   // Stack interface
   bool
-       handle_amf_rx_msg(srsran::unique_byte_buffer_t pdu, const sockaddr_in& from, const sctp_sndrcvinfo& sri, int flags);
+  handle_amf_rx_msg(srsran::unique_byte_buffer_t pdu, const sockaddr_in& from, const sctp_sndrcvinfo& sri, int flags);
   void get_metrics(ngap_metrics_t& m);
   void get_args(ngap_args_t& args_);
 
@@ -138,6 +138,8 @@ private:
   bool handle_initial_ctxt_setup_request(const asn1::ngap::init_context_setup_request_s& msg);
   // TS 38.413 - Section 9.2.1.1 - PDU Session Resource Setup Request
   bool handle_ue_pdu_session_res_setup_request(const asn1::ngap::pdu_session_res_setup_request_s& msg);
+  // TS 38.413 - Section 9.2.4.1 - Paging
+  bool handle_paging(const asn1::ngap::paging_s& msg);
 
   // PCAP
   srsran::ngap_pcap* pcap = nullptr;

srsgnb/src/stack/ngap/ngap.cc

@@ -435,6 +435,8 @@ bool ngap::handle_initiating_message(const asn1::ngap::init_msg_s& msg)
       return handle_ue_context_release_cmd(msg.value.ue_context_release_cmd());
     case ngap_elem_procs_o::init_msg_c::types_opts::pdu_session_res_setup_request:
       return handle_ue_pdu_session_res_setup_request(msg.value.pdu_session_res_setup_request());
+    case ngap_elem_procs_o::init_msg_c::types_opts::paging:
+      return handle_paging(msg.value.paging());
     default:
       logger.error("Unhandled initiating message: %s", msg.value.type().to_string());
   }
@@ -574,6 +576,20 @@ bool ngap::handle_ue_pdu_session_res_setup_request(const asn1::ngap::pdu_session
   return true;
 }
 
+bool ngap::handle_paging(const asn1::ngap::paging_s& msg)
+{
+  logger.info("Paging is not supported yet.");
+
+  // TODO: Handle Paging after RRC Paging is implemented
+
+  // uint32_t ue_paging_id = msg->ue_paging_id.id;
+  // Note: IMSI Paging is not supported in NR
+  // uint64_t tmsi = msg->ue_paging_id.value.five_g_s_tmsi().five_g_tmsi.to_number();
+  // rrc->add_paging(ue_paging_id, tmsi);
+
+  return true;
+}
+
 /*******************************************************************************
 /* NGAP message senders
 ********************************************************************************/