transmission of RRCReestablishmentRequest message

openair1/SIMULATION/NR_PHY/nr_dummy_functions.c

@@ -32,7 +32,7 @@ void nr_mac_rrc_sync_ind(const module_id_t module_id,
                          const frame_t frame,
                          const bool in_sync) {}
 
-void nr_mac_rrc_msg3_ind(const module_id_t mod_id, int rnti) {}
+void nr_mac_rrc_msg3_ind(const module_id_t mod_id, int rnti, int gnb_id) {}
 
 void nr_mac_rrc_ra_ind(const module_id_t mod_id, int frame, bool success) {}
 
@@ -48,6 +48,7 @@ int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id,
                               const frame_t frame,
                               const int slot,
                               const rnti_t rnti,
+                              const uint32_t cellid,
                               const channel_t channel,
                               const uint8_t* pduP,
                               const sdu_size_t pdu_len) { return 0; }

openair2/COMMON/mac_messages_types.h

@@ -76,7 +76,8 @@ typedef struct NRRrcMacRaInd_s {
 } NRRrcMacRaInd;
 
 typedef struct NRRrcMacMsg3Ind_s {
-  uint16_t  rnti;
+  uint16_t rnti;
+  int gnb_id;
 } NRRrcMacMsg3Ind;
 
 typedef struct RrcMacInSyncInd_s {
@@ -118,6 +119,7 @@ typedef struct NRRrcMacBcchDataInd_s {
   bool      is_bch;
   uint8_t   rsrq;
   uint8_t   rsrp;
+  uint32_t  phycellid;
 } NRRrcMacBcchDataInd;
 
 typedef struct NRRrcMacSBcchDataInd_s {

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -267,7 +267,7 @@ int8_t nr_ue_decode_BCCH_DL_SCH(NR_UE_MAC_INST_t *mac,
 {
   if(ack_nack) {
     LOG_D(NR_MAC, "Decoding NR-BCCH-DL-SCH-Message (SIB1 or SI)\n");
-    nr_mac_rrc_data_ind_ue(mac->ue_id, cc_id, gNB_index, 0, 0, 0, NR_BCCH_DL_SCH, (uint8_t *) pduP, pdu_len);
+    nr_mac_rrc_data_ind_ue(mac->ue_id, cc_id, gNB_index, 0, 0, 0, mac->physCellId, NR_BCCH_DL_SCH, (uint8_t *) pduP, pdu_len);
     mac->get_sib1 = false;
     mac->get_otherSI = false;
   }
@@ -4030,7 +4030,7 @@ int nr_write_ce_ulsch_pdu(uint8_t *mac_ce,
 // - optimize: mu_pusch, j and table_6_1_2_1_1_2_time_dom_res_alloc_A are already defined in nr_ue_procedures
 static void nr_ue_process_rar(NR_UE_MAC_INST_t *mac, nr_downlink_indication_t *dl_info, int pdu_id)
 {
-  frame_t frame  = dl_info->frame;
+  frame_t frame = dl_info->frame;
   int slot = dl_info->slot;
 
   if(dl_info->rx_ind->rx_indication_body[pdu_id].pdsch_pdu.ack_nack == 0) {
@@ -4230,7 +4230,7 @@ static void nr_ue_process_rar(NR_UE_MAC_INST_t *mac, nr_downlink_indication_t *d
       if (!ra->cfra) {
         ra->t_crnti = rar->TCRNTI_2 + (rar->TCRNTI_1 << 8);
         rnti = ra->t_crnti;
-        nr_mac_rrc_msg3_ind(mac->ue_id, rnti);
+        nr_mac_rrc_msg3_ind(mac->ue_id, rnti, dl_info->gNB_index);
       }
       fapi_nr_ul_config_request_pdu_t *pdu = lockGet_ul_config(mac, frame_tx, slot_tx, FAPI_NR_UL_CONFIG_TYPE_PUSCH);
       if (!pdu)

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.c

@@ -120,7 +120,7 @@ void nr_rlc_release_entity(int rnti, logical_chan_id_t channel_id)
 void mac_rlc_data_ind(const module_id_t  module_idP,
                       const rnti_t rntiP,
                       const eNB_index_t eNB_index,
-                      const frame_t  rameP,
+                      const frame_t frameP,
                       const eNB_flag_t enb_flagP,
                       const MBMS_flag_t MBMS_flagP,
                       const logical_chan_id_t channel_idP,
@@ -631,9 +631,10 @@ void nr_rlc_reestablish_entity(int rnti, int lc_id)
   nr_rlc_manager_lock(nr_rlc_ue_manager);
   nr_rlc_ue_t *ue = nr_rlc_manager_get_ue(nr_rlc_ue_manager, rnti);
 
-  if (ue == NULL)
+  if (ue == NULL) {
     LOG_E(RLC, "RLC instance for the given UE was not found \n");
-
+    return;
+  }
   nr_rlc_entity_t *rb = get_rlc_entity_from_lcid(ue, lc_id);
 
   if (rb != NULL) {
@@ -645,6 +646,34 @@ void nr_rlc_reestablish_entity(int rnti, int lc_id)
   nr_rlc_manager_unlock(nr_rlc_ue_manager);
 }
 
+void nr_rlc_reestablish_default_srb(int rnti, int srb_id)
+{
+  nr_rlc_manager_lock(nr_rlc_ue_manager);
+  nr_rlc_ue_t *ue = nr_rlc_manager_get_ue(nr_rlc_ue_manager, rnti);
+
+  if (ue == NULL) {
+    LOG_E(RLC, "RLC instance for the given UE was not found \n");
+    return;
+  }
+  nr_rlc_entity_t *srb = ue->srb[srb_id - 1];
+  if (srb != NULL) {
+    srb->reestablishment(srb);
+    // default values as in 9.2.1 of 38.331
+    int sn_field_length = 12;
+    nr_rlc_entity_am_reconfigure(srb,
+                                 45, //t_poll_retransmit
+                                 35, //t_reassembly
+                                 0, //t_status_prohibit
+                                 -1, //poll_pdu
+                                 -1, //poll_byte
+                                 8, //max_retx_threshold
+                                 &sn_field_length);
+  } else {
+    LOG_E(RLC, "no RLC entity found corresponding to SRB%d for reestablishment\n", srb_id);
+  }
+  nr_rlc_manager_unlock(nr_rlc_ue_manager);
+}
+
 void nr_rlc_reconfigure_entity(int rnti, int lc_id, NR_RLC_Config_t *rlc_Config)
 {
   nr_rlc_manager_lock(nr_rlc_ue_manager);

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.h

@@ -45,6 +45,7 @@ void nr_rlc_add_srb(int rnti, int srb_id, const NR_RLC_BearerConfig_t *rlc_Beare
 void nr_rlc_add_drb(int rnti, int drb_id, const NR_RLC_BearerConfig_t *rlc_BearerConfig);
 
 void nr_rlc_reestablish_entity(int rnti, int lc_id);
+void nr_rlc_reestablish_default_srb(int rnti, int srb_id);
 void nr_rlc_remove_ue(int rnti);
 bool nr_rlc_update_rnti(int from_rnti, int to_rnti);
 

openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c

@@ -1048,7 +1048,8 @@ static int handle_bcch_bch(NR_UE_MAC_INST_t *mac,
     mac->frequency_range = FR2;
   else
     mac->frequency_range = FR1;
-  nr_mac_rrc_data_ind_ue(mac->ue_id, cc_id, gNB_index, 0, 0, 0, NR_BCCH_BCH, (uint8_t *) pduP, 3);    //  fixed 3 bytes MIB PDU
+  //  fixed 3 bytes MIB PDU
+  nr_mac_rrc_data_ind_ue(mac->ue_id, cc_id, gNB_index, 0, 0, 0, cell_id, NR_BCCH_BCH, (uint8_t *) pduP, 3);
   return 0;
 }
 

openair2/RRC/NR/MESSAGES/asn1_msg.c

@@ -979,7 +979,10 @@ uint8_t do_NR_ULInformationTransfer(uint8_t **buffer, uint32_t pdu_length, uint8
     return encoded;
 }
 
-uint8_t do_RRCReestablishmentRequest(uint8_t *buffer, uint16_t c_rnti)
+uint8_t do_RRCReestablishmentRequest(uint8_t *buffer,
+                                     NR_ReestablishmentCause_t cause,
+                                     uint32_t cell_id,
+                                     uint16_t c_rnti)
 {
   asn_enc_rval_t enc_rval;
   NR_UL_CCCH_Message_t ul_ccch_msg;
@@ -994,16 +997,16 @@ uint8_t do_RRCReestablishmentRequest(uint8_t *buffer, uint16_t c_rnti)
 
   rrcReestablishmentRequest = ul_ccch_msg.message.choice.c1->choice.rrcReestablishmentRequest;
   // test
-  rrcReestablishmentRequest->rrcReestablishmentRequest.reestablishmentCause = NR_ReestablishmentCause_reconfigurationFailure;
+  rrcReestablishmentRequest->rrcReestablishmentRequest.reestablishmentCause = cause;
   rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.c_RNTI = c_rnti;
-  rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.physCellId = 0;
+  rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.physCellId = cell_id;
+  // TODO properly setting shortMAC-I (see 5.3.7.4 of 331)
   rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.shortMAC_I.buf = buf;
   rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.shortMAC_I.buf[0] = 0x08;
   rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.shortMAC_I.buf[1] = 0x32;
   rrcReestablishmentRequest->rrcReestablishmentRequest.ue_Identity.shortMAC_I.size = 2;
 
-
-  if ( LOG_DEBUGFLAG(DEBUG_ASN1) ) {
+  if (LOG_DEBUGFLAG(DEBUG_ASN1)) {
     xer_fprint(stdout, &asn_DEF_NR_UL_CCCH_Message, (void *)&ul_ccch_msg);
   }
 

openair2/RRC/NR/MESSAGES/asn1_msg.h

@@ -131,7 +131,10 @@ uint8_t do_NR_ULInformationTransfer(uint8_t **buffer,
                         uint32_t pdu_length,
                         uint8_t *pdu_buffer);
 
-uint8_t do_RRCReestablishmentRequest(uint8_t *buffer, uint16_t c_rnti);
+uint8_t do_RRCReestablishmentRequest(uint8_t *buffer,
+                                     NR_ReestablishmentCause_t cause,
+                                     uint32_t cell_id,
+                                     uint16_t c_rnti);
 
 int do_RRCReestablishment(rrc_gNB_ue_context_t *const ue_context_pP,
                           uint8_t *const buffer,

openair2/RRC/NR_UE/L2_interface_ue.c

@@ -55,6 +55,7 @@ int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id,
                               const frame_t frame,
                               const int slot,
                               const rnti_t rnti,
+                              const uint32_t cellid,
                               const channel_t channel,
                               const uint8_t* pduP,
                               const sdu_size_t pdu_len)
@@ -85,6 +86,7 @@ int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id,
         NR_RRC_MAC_BCCH_DATA_IND (message_p).slot = slot;
         NR_RRC_MAC_BCCH_DATA_IND (message_p).sdu_size = sdu_size;
         NR_RRC_MAC_BCCH_DATA_IND (message_p).gnb_index = gNB_index;
+        NR_RRC_MAC_BCCH_DATA_IND (message_p).phycellid = cellid;
         NR_RRC_MAC_BCCH_DATA_IND (message_p).is_bch = (channel == NR_BCCH_BCH);
         itti_send_msg_to_task(TASK_RRC_NRUE, GNB_MODULE_ID_TO_INSTANCE(module_id), message_p);
       }
@@ -127,10 +129,11 @@ int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id,
   return(0);
 }
 
-void nr_mac_rrc_msg3_ind(const module_id_t mod_id, const int rnti)
+void nr_mac_rrc_msg3_ind(const module_id_t mod_id, const int rnti, int gnb_id)
 {
   MessageDef *message_p = itti_alloc_new_message(TASK_MAC_UE, 0, NR_RRC_MAC_MSG3_IND);
   NR_RRC_MAC_MSG3_IND (message_p).rnti = rnti;
+  NR_RRC_MAC_MSG3_IND (message_p).gnb_id = gnb_id;
   itti_send_msg_to_task(TASK_RRC_NRUE, GNB_MODULE_ID_TO_INSTANCE(mod_id), message_p);
 }
 

openair2/RRC/NR_UE/rrc_UE.c

@@ -405,10 +405,12 @@ int check_si_status(NR_UE_RRC_SI_INFO *SI_info)
 /*brief decode BCCH-BCH (MIB) message*/
 static void nr_rrc_ue_decode_NR_BCCH_BCH_Message(NR_UE_RRC_INST_t *rrc,
                                                  const uint8_t gNB_index,
+                                                 const uint32_t phycellid,
                                                  uint8_t *const bufferP,
                                                  const uint8_t buffer_len)
 {
   NR_BCCH_BCH_Message_t *bcch_message = NULL;
+  rrc->phyCellID = phycellid;
 
   asn_dec_rval_t dec_rval = uper_decode_complete(NULL,
                                                  &asn_DEF_NR_BCCH_BCH_Message,
@@ -425,9 +427,17 @@ static void nr_rrc_ue_decode_NR_BCCH_BCH_Message(NR_UE_RRC_INST_t *rrc,
   NR_UE_Timers_Constants_t *timers = &rrc->timers_and_constants;
   if (is_nr_timer_active(timers->T311)) {
     nr_timer_stop(&timers->T311);
-    nr_timer_start(&timers->T301);
     rrc->ra_trigger = RRC_CONNECTION_REESTABLISHMENT;
 
+    // preparing MSG3 for re-establishment in advance
+    uint8_t buffer[1024];
+    int buf_size = do_RRCReestablishmentRequest(buffer,
+                                                rrc->reestablishment_cause,
+                                                rrc->phyCellID,
+                                                rrc->rnti); // old rnti
+
+    nr_rlc_srb_recv_sdu(rrc->ue_id, 0, buffer, buf_size);
+
     // apply the default MAC Cell Group configuration
     // (done at MAC by calling nr_ue_mac_default_configs)
 
@@ -565,18 +575,29 @@ static int nr_decode_SI(NR_UE_RRC_SI_INFO *SI_info, NR_SystemInformation_t *si)
   return 0;
 }
 
-static void nr_rrc_handle_msg3_indication(NR_UE_RRC_INST_t *rrc, rnti_t rnti)
+static void nr_rrc_handle_msg3_indication(NR_UE_RRC_INST_t *rrc, rnti_t rnti, int gnb_id)
 {
+  NR_UE_Timers_Constants_t *tac = &rrc->timers_and_constants;
   switch (rrc->ra_trigger) {
     case INITIAL_ACCESS_FROM_RRC_IDLE:
       // After SIB1 is received, prepare RRCConnectionRequest
       rrc->rnti = rnti;
       // start timer T300
-      NR_UE_Timers_Constants_t *tac = &rrc->timers_and_constants;
       nr_timer_start(&tac->T300);
       break;
     case RRC_CONNECTION_REESTABLISHMENT:
-      AssertFatal(1==0, "ra_trigger not implemented yet!\n");
+      rrc->rnti = rnti;
+      nr_timer_start(&tac->T301);
+      int srb_id = 1;
+      // re-establish PDCP for SRB1
+      nr_pdcp_reestablishment(rrc->ue_id, srb_id, true);
+      // re-establish RLC for SRB1
+      // apply the specified configuration defined in 9.2.1 for SRB1
+      nr_rlc_reestablish_default_srb(rrc->ue_id, srb_id);
+      // TODO configure lower layers to suspend integrity protection and ciphering for SRB1
+      // resume SRB1
+      rrcPerNB_t *rrcNB = rrc->perNB + gnb_id;
+      rrcNB->Srb[srb_id] = RB_ESTABLISHED;
       break;
     case DURING_HANDOVER:
       AssertFatal(1==0, "ra_trigger not implemented yet!\n");
@@ -1426,7 +1447,7 @@ void *rrc_nrue(void *notUsed)
     break;
 
   case NR_RRC_MAC_MSG3_IND:
-    nr_rrc_handle_msg3_indication(rrc, NR_RRC_MAC_MSG3_IND(msg_p).rnti);
+    nr_rrc_handle_msg3_indication(rrc, NR_RRC_MAC_MSG3_IND(msg_p).rnti, NR_RRC_MAC_MSG3_IND(msg_p).gnb_id);
     break;
 
   case NR_RRC_MAC_RA_IND:
@@ -1443,7 +1464,7 @@ void *rrc_nrue(void *notUsed)
     LOG_D(NR_RRC, "[UE %ld] Received %s: gNB %d\n", rrc->ue_id, ITTI_MSG_NAME(msg_p), NR_RRC_MAC_BCCH_DATA_IND(msg_p).gnb_index);
     NRRrcMacBcchDataInd *bcch = &NR_RRC_MAC_BCCH_DATA_IND(msg_p);
     if (bcch->is_bch)
-      nr_rrc_ue_decode_NR_BCCH_BCH_Message(rrc, bcch->gnb_index, bcch->sdu, bcch->sdu_size);
+      nr_rrc_ue_decode_NR_BCCH_BCH_Message(rrc, bcch->gnb_index, bcch->phycellid, bcch->sdu, bcch->sdu_size);
     else
       nr_rrc_ue_decode_NR_BCCH_DL_SCH_Message(rrc, bcch->gnb_index, bcch->sdu, bcch->sdu_size, bcch->rsrq, bcch->rsrp);
     break;
@@ -1607,8 +1628,11 @@ static void nr_rrc_ue_process_ueCapabilityEnquiry(NR_UE_RRC_INST_t *rrc, NR_UECa
 }
 
 void nr_rrc_initiate_rrcReestablishment(NR_UE_RRC_INST_t *rrc,
+                                        NR_ReestablishmentCause_t cause,
                                         const int gnb_id)
 {
+  rrc->reestablishment_cause = cause;
+
   NR_UE_Timers_Constants_t *timers = &rrc->timers_and_constants;
   rrcPerNB_t *rrcNB = rrc->perNB + gnb_id;
 
@@ -1637,7 +1661,6 @@ void nr_rrc_initiate_rrcReestablishment(NR_UE_RRC_INST_t *rrc,
   }
   // release the MCG SCell(s), if configured
   // no SCell configured in our implementation
-  rrc->nrRrcState = RRC_STATE_REESTABLISHMENT;
 
   // reset MAC
   // release spCellConfig, if configured

openair2/RRC/NR_UE/rrc_defs.h

@@ -56,6 +56,7 @@
 #include "NR_UE-NR-Capability.h"
 #include "NR_SL-PreconfigurationNR-r16.h"
 #include "NR_MasterInformationBlockSidelink.h"
+#include "NR_ReestablishmentCause.h"
 
 #include "RRC/NR/nr_rrc_common.h"
 #include "as_message.h"
@@ -85,7 +86,6 @@ typedef enum Rrc_State_NR_e {
   RRC_STATE_INACTIVE_NR,
   RRC_STATE_CONNECTED_NR,
   RRC_STATE_DETACH_NR,
-  RRC_STATE_REESTABLISHMENT
 } Rrc_State_NR_t;
 
 typedef enum requested_SI_List_e {
@@ -188,12 +188,15 @@ typedef struct NR_UE_RRC_INST_s {
   instance_t ue_id;
   rrcPerNB_t perNB[NB_CNX_UE];
 
-  char                           *uecap_file;
-  rnti_t                         rnti;
+  char *uecap_file;
+  rnti_t rnti;
+  uint32_t phyCellID;
 
   OAI_NR_UECapability_t UECap;
   NR_UE_Timers_Constants_t timers_and_constants;
+
   RA_trigger_t ra_trigger;
+  NR_ReestablishmentCause_t reestablishment_cause;
   plmn_t plmnID;
 
   NR_BWP_Id_t dl_bwp_id;

openair2/RRC/NR_UE/rrc_proto.h

@@ -73,6 +73,7 @@ int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id,
                               const frame_t frame,
                               const int slot,
                               const rnti_t rnti,
+                              const uint32_t cellid,
                               const channel_t channel,
                               const uint8_t* pduP,
                               const sdu_size_t pdu_len);
@@ -86,7 +87,7 @@ void nr_rrc_going_to_IDLE(NR_UE_RRC_INST_t *rrc,
                           NR_RRCRelease_t *RRCRelease);
 
 void nr_mac_rrc_ra_ind(const module_id_t mod_id, int frame, bool success);
-void nr_mac_rrc_msg3_ind(const module_id_t mod_id, const int rnti);
+void nr_mac_rrc_msg3_ind(const module_id_t mod_id, const int rnti, int gnb_id);
 void set_rlf_sib1_timers_and_constants(NR_UE_Timers_Constants_t *tac, NR_SIB1_t *sib1);
 
 /**\brief RRC UE task.