Make sure that PDCP SN is initialized properly in the eNB. UE attaches again when using encription.

lib/src/upper/pdcp_entity.cc

@@ -84,9 +84,9 @@ void pdcp_entity::init(srsue::rlc_interface_pdcp      *rlc_,
   rx_hfn          = 0;
   next_pdcp_rx_sn = 0;
   maximum_pdcp_sn = (1 << cfg.sn_len) - 1;
-  printf("Maximum PDCP SN %d\n", maximum_pdcp_sn);
   last_submitted_pdcp_rx_sn = maximum_pdcp_sn;
   log->info("Init %s with bearer ID: %d\n", rrc->get_rb_name(lcid).c_str(), cfg.bearer_id);
+  log->info("SN len bits: %d, SN len bytes: %d, reordering window: %d, Maximum SN %d\n", cfg.sn_len, sn_len_bytes, reordering_window, maximum_pdcp_sn);
 }
 
 // Reestablishment procedure: 36.323 5.2

srsenb/src/stack/rrc/rrc.cc

@@ -195,6 +195,7 @@ void rrc::add_user(uint16_t rnti)
     srslte::srslte_pdcp_config_t cfg;
     cfg.is_control   = false;
     cfg.is_data      = true;
+    cfg.sn_len       = 12;
     cfg.direction    = SECURITY_DIRECTION_DOWNLINK;
     uint32_t teid_in = 1;
 
@@ -1529,6 +1530,8 @@ void rrc::ue::send_connection_setup(bool is_setup)
   srslte::srslte_pdcp_config_t pdcp_cnfg;
   pdcp_cnfg.bearer_id  = 1;
   pdcp_cnfg.is_control = true;
+  pdcp_cnfg.is_data    = false;
+  pdcp_cnfg.sn_len     = 5;
   pdcp_cnfg.direction  = SECURITY_DIRECTION_DOWNLINK;
   parent->pdcp->add_bearer(rnti, 1, pdcp_cnfg);
 
@@ -1739,6 +1742,7 @@ void rrc::ue::send_connection_reconf(srslte::unique_byte_buffer_t pdu)
   pdcp_cnfg.direction  = SECURITY_DIRECTION_DOWNLINK;
   pdcp_cnfg.is_control = true;
   pdcp_cnfg.is_data    = false;
+  pdcp_cnfg.sn_len     = 5;
   parent->pdcp->add_bearer(rnti, 2, pdcp_cnfg);
   parent->pdcp->config_security(rnti, 2, k_rrc_enc, k_rrc_int, k_up_enc, cipher_algo, integ_algo);
   parent->pdcp->enable_integrity(rnti, 2);
@@ -1750,6 +1754,7 @@ void rrc::ue::send_connection_reconf(srslte::unique_byte_buffer_t pdu)
   // Configure DRB1 in PDCP
   pdcp_cnfg.is_control = false;
   pdcp_cnfg.is_data    = true;
+  pdcp_cnfg.sn_len     = 12;
   pdcp_cnfg.bearer_id  = 1; // TODO: Review all ID mapping LCID DRB ERAB EPSBID Mapping
   if (conn_reconf->rr_cfg_ded.drb_to_add_mod_list[0].pdcp_cfg.rlc_um_present) {
     if (conn_reconf->rr_cfg_ded.drb_to_add_mod_list[0].pdcp_cfg.rlc_um.pdcp_sn_size.value ==
@@ -1812,10 +1817,13 @@ void rrc::ue::send_connection_reconf_new_bearer(LIBLTE_S1AP_E_RABTOBESETUPLISTBE
 
     // Configure DRB in RLC
     parent->rlc->add_bearer(rnti, lcid, &drb_item.rlc_cfg);
+
     // Configure DRB in PDCP
     srslte::srslte_pdcp_config_t pdcp_config;
     pdcp_config.bearer_id  = drb_item.drb_id - 1; // TODO: Review all ID mapping LCID DRB ERAB EPSBID Mapping
+    pdcp_config.is_control = false;
     pdcp_config.is_data    = true;
+    pdcp_config.sn_len     = 12;
     pdcp_config.direction  = SECURITY_DIRECTION_DOWNLINK;
     parent->pdcp->add_bearer(rnti, lcid, pdcp_config);