SRSUE/SRSENB: UCI bits are carrier by the lowest serving cell index

SRSENB: Fix UCI in lowest serving cell index PUSCH transmission

lib/src/phy/ue/ue_dl.c

@@ -1383,6 +1383,7 @@ void srslte_ue_dl_gen_ack(const srslte_cell_t*      cell,
                           const srslte_pdsch_ack_t* ack_info,
                           srslte_uci_data_t*        uci_data)
 {
+  uci_data->value.ack.valid = true; //< Always true for UE transmitter
   if (cell->frame_type == SRSLTE_FDD) {
     gen_ack_fdd(ack_info, uci_data);
   } else {

srsenb/hdr/phy/cc_worker.h

@@ -103,8 +103,7 @@ private:
       // Do nothing
     }
 
-    bool                 is_grant_available = false;
-    srslte_phich_grant_t phich_grant        = {};
+    srslte_phich_grant_t phich_grant = {};
 
     void     metrics_read(phy_metrics_t* metrics);
     void     metrics_dl(uint32_t mcs);

srsenb/hdr/phy/phy_ue_db.h

@@ -86,6 +86,7 @@ private:
     uint8_t                                          last_ri    = 0;  ///< Last reported rank indicator
     std::array<srslte_ra_tb_t, SRSLTE_MAX_HARQ_PROC> last_tb    = {}; ///< Stores last PUSCH Resource allocation
     srslte::phy_cfg_t                                phy_cfg;         ///< Configuration, it has a default constructor
+    std::array<bool, TTIMOD_SZ> is_grant_available;                   ///< Indicates whether there is an available grant
   } cell_info_t;
 
   /**
@@ -156,6 +157,18 @@ private:
    */
   inline uint32_t _get_ue_cc_idx(uint16_t rnti, uint32_t enb_cc_idx) const;
 
+  /**
+   * Gets the eNb Cell/Carrier index in which the UCI shall be carried. This corresponds to the serving cell with lowest
+   * index that has an UL grant available.
+   *
+   * If no grant is available in the indicated TTI, it returns the number of the eNb Cells/Carriers.
+   *
+   * @param tti The UL processing TTI
+   * @param rnti Temporal UE ID
+   * @return the eNb Cell/Carrier with lowest serving cell index that has an UL grant
+   */
+  uint32_t _get_uci_enb_cc_idx(uint32_t tti, uint16_t rnti) const;
+
   /**
    * Checks if a given RNTI exists in the database
    * @param rnti provides UE identifier
@@ -358,7 +371,7 @@ public:
    * identifier.
    *
    * @param rnti the UE temporal ID
-   * @param cc_idx the cell/carrier origin of the transmission
+   * @param enb_cc_idx the cell/carrier origin of the transmission
    * @param pid HARQ process identifier
    * @param tb the Resource Allocation for the PUSCH transport block
    */
@@ -375,6 +388,14 @@ public:
    * @return the Resource Allocation for the PUSCH transport block
    */
   srslte_ra_tb_t get_last_ul_tb(uint16_t rnti, uint32_t enb_cc_idx, uint32_t pid) const;
+
+  /**
+   * Flags to true the UL grant available for a given TTI, RNTI and eNb cell/carrier index
+   * @param tti the current TTI
+   * @param rnti
+   * @param enb_cc_idx
+   */
+  void set_ul_grant_available(uint32_t tti, const stack_interface_phy_lte::ul_sched_list_t& ul_sched_list);
 };
 
 } // namespace srsenb

srsenb/src/phy/cc_worker.cc

@@ -227,10 +227,6 @@ void cc_worker::work_ul(const srslte_ul_sf_cfg_t& ul_sf_cfg, stack_interface_phy
   ul_sf = ul_sf_cfg;
   log_h->step(ul_sf.tti);
 
-  for (auto& ue : ue_db) {
-    ue.second->is_grant_available = false;
-  }
-
   // Process UL signal
   srslte_enb_ul_fft(&enb_ul);
 
@@ -291,11 +287,13 @@ void cc_worker::decode_pusch_rnti(stack_interface_phy_lte::ul_sched_grant_t& ul_
   // Get UE configuration
   ul_cfg = phy->ue_db.get_ul_config(rnti, cc_idx);
 
-  // mark this tti as having an ul dci to avoid pucch
-  ue_db[rnti]->is_grant_available = true;
-
   // Fill UCI configuration
-  phy->ue_db.fill_uci_cfg(tti_rx, cc_idx, rnti, ul_grant.dci.cqi_request, true, ul_cfg.pusch.uci_cfg);
+  bool uci_required =
+      phy->ue_db.fill_uci_cfg(tti_rx, cc_idx, rnti, ul_grant.dci.cqi_request, true, ul_cfg.pusch.uci_cfg);
+
+  if (ul_cfg.pusch.softbuffers.rx) {
+    srslte_softbuffer_rx_reset(ul_cfg.pusch.softbuffers.rx);
+  }
 
   // Compute UL grant
   srslte_pusch_grant_t& grant = ul_cfg.pusch.grant;
@@ -347,7 +345,9 @@ void cc_worker::decode_pusch_rnti(stack_interface_phy_lte::ul_sched_grant_t& ul_
   }
 
   // Send UCI data to MAC
-  phy->ue_db.send_uci_data(tti_rx, rnti, cc_idx, ul_cfg.pusch.uci_cfg, pusch_res.uci);
+  if (uci_required) {
+    phy->ue_db.send_uci_data(tti_rx, rnti, cc_idx, ul_cfg.pusch.uci_cfg, pusch_res.uci);
+  }
 
   // Save statistics only if data was provided
   if (ul_grant.data != nullptr) {
@@ -393,7 +393,7 @@ int cc_worker::decode_pucch()
     uint16_t rnti = iter.first;
 
     // If it's a User RNTI and doesn't have PUSCH grant in this TTI
-    if (SRSLTE_RNTI_ISUSER(rnti) and not ue_db[rnti]->is_grant_available and phy->ue_db.is_pcell(rnti, cc_idx)) {
+    if (SRSLTE_RNTI_ISUSER(rnti) and phy->ue_db.is_pcell(rnti, cc_idx)) {
       srslte_ul_cfg_t ul_cfg = phy->ue_db.get_ul_config(rnti, cc_idx);
 
       // Check if user needs to receive PUCCH

srsenb/src/phy/phy_ue_db.cc

@@ -101,6 +101,7 @@ inline void phy_ue_db::_set_common_config_rnti(uint16_t rnti, srslte::phy_cfg_t&
   phy_cfg.ul_cfg.pucch.threshold_format1             = SRSLTE_PUCCH_DEFAULT_THRESHOLD_FORMAT1;
   phy_cfg.ul_cfg.pucch.threshold_data_valid_format1a = SRSLTE_PUCCH_DEFAULT_THRESHOLD_FORMAT1A;
   phy_cfg.ul_cfg.pucch.threshold_data_valid_format2  = SRSLTE_PUCCH_DEFAULT_THRESHOLD_FORMAT2;
+  phy_cfg.ul_cfg.pucch.threshold_data_valid_format3  = SRSLTE_PUCCH_DEFAULT_THRESHOLD_FORMAT3;
   phy_cfg.ul_cfg.pucch.threshold_dmrs_detection      = SRSLTE_PUCCH_DEFAULT_THRESHOLD_DMRS;
 }
 
@@ -119,6 +120,18 @@ inline uint32_t phy_ue_db::_get_ue_cc_idx(uint16_t rnti, uint32_t enb_cc_idx) co
   return ue_cc_idx;
 }
 
+uint32_t phy_ue_db::_get_uci_enb_cc_idx(uint32_t tti, uint16_t rnti) const
+{
+  // Find the lowest index available PUSCH grant
+  for (const cell_info_t& cell_info : ue_db.at(rnti).cell_info) {
+    if (cell_info.is_grant_available[TTIMOD(tti)]) {
+      return cell_info.enb_cc_idx;
+    }
+  }
+
+  return (uint32_t)cell_cfg_list->size();
+}
+
 inline int phy_ue_db::_assert_rnti(uint16_t rnti) const
 {
   if (not ue_db.count(rnti)) {
@@ -456,13 +469,32 @@ bool phy_ue_db::fill_uci_cfg(uint32_t          tti,
   // Reset UCI CFG, avoid returning carrying cached information
   uci_cfg = {};
 
-  // Assert rnti and cell exits and it is PCell
-  if (_assert_enb_pcell(rnti, enb_cc_idx) != SRSLTE_SUCCESS) {
+  // Assert Cell List configuration
+  if (_assert_cell_list_cfg() != SRSLTE_SUCCESS) {
     return false;
   }
 
-  // Assert Cell List configuration
-  if (_assert_cell_list_cfg() != SRSLTE_SUCCESS) {
+  // Assert eNb Cell/Carrier for the given RNTI
+  if (_assert_active_enb_cc(rnti, enb_cc_idx) != SRSLTE_SUCCESS) {
+    return false;
+  }
+
+  // Get the eNb cell/carrier index with lowest serving cell index (ue_cc_idx) that has an available grant.
+  uint32_t uci_enb_cc_id         = _get_uci_enb_cc_idx(tti, rnti);
+  bool     pusch_grant_available = (uci_enb_cc_id < (uint32_t)cell_cfg_list->size());
+
+  // There is a PUSCH grant available for the provided RNTI in at least one serving cell and this call is for PUCCH
+  if (pusch_grant_available and not is_pusch_available) {
+    return false;
+  }
+
+  // There is a PUSCH grant and enb_cc_idx with lowest ue_cc_idx with a grant
+  if (pusch_grant_available and uci_enb_cc_id != enb_cc_idx) {
+    return false;
+  }
+
+  // No PUSCH grant for this TTI and cell and no enb_cc_idx is not the PCell
+  if (not pusch_grant_available and _get_ue_cc_idx(rnti, enb_cc_idx) != 0) {
     return false;
   }
 
@@ -524,8 +556,8 @@ void phy_ue_db::send_uci_data(uint32_t                  tti,
 {
   std::lock_guard<std::mutex> lock(mutex);
 
-  // Assert UE RNTI database entry and eNb cell/carrier must be primary cell
-  if (_assert_enb_pcell(rnti, enb_cc_idx) != SRSLTE_SUCCESS) {
+  // Assert UE RNTI database entry and eNb cell/carrier must be active
+  if (_assert_active_enb_cc(rnti, enb_cc_idx) != SRSLTE_SUCCESS) {
     return;
   }
 
@@ -639,3 +671,29 @@ srslte_ra_tb_t phy_ue_db::get_last_ul_tb(uint16_t rnti, uint32_t enb_cc_idx, uin
   // Returns the latest stored UL transmission grant
   return ue_db.at(rnti).cell_info[_get_ue_cc_idx(rnti, enb_cc_idx)].last_tb[pid % SRSLTE_FDD_NOF_HARQ];
 }
+
+void phy_ue_db::set_ul_grant_available(uint32_t tti, const stack_interface_phy_lte::ul_sched_list_t& ul_sched_list)
+{
+  std::lock_guard<std::mutex> lock(mutex);
+
+  // Reset all available grants flags for the given TTI
+  for (auto& ue : ue_db) {
+    for (cell_info_t& cell_info : ue.second.cell_info) {
+      cell_info.is_grant_available[TTIMOD(tti)] = false;
+    }
+  }
+
+  // For each eNb Cell/Carrier grant set a flag to the corresponding RNTI
+  for (uint32_t enb_cc_idx = 0; enb_cc_idx < (uint32_t)ul_sched_list.size(); enb_cc_idx++) {
+    const stack_interface_phy_lte::ul_sched_t& ul_sched = ul_sched_list[enb_cc_idx];
+    for (uint32_t i = 0; i < ul_sched.nof_grants; i++) {
+      const stack_interface_phy_lte::ul_sched_grant_t& ul_sched_grant = ul_sched.pusch[i];
+      uint16_t                                         rnti           = ul_sched_grant.dci.rnti;
+      // Check that eNb Cell/Carrier is active for the given RNTI
+      if (_assert_active_enb_cc(rnti, enb_cc_idx) == SRSLTE_SUCCESS) {
+        // Rise Grant available flag
+        ue_db[rnti].cell_info[_get_ue_cc_idx(rnti, enb_cc_idx)].is_grant_available[TTIMOD(tti)] = true;
+      }
+    }
+  }
+}

srsenb/src/phy/sf_worker.cc

@@ -203,6 +203,9 @@ void sf_worker::work_imp()
   // Configure UL subframe
   ul_sf.tti = tti_rx;
 
+  // Set UL grant availability prior to any UL processing
+  phy->ue_db.set_ul_grant_available(tti_rx, ul_grants);
+
   // Process UL
   for (uint32_t cc = 0; cc < cc_workers.size(); cc++) {
     cc_workers[cc]->work_ul(ul_sf, ul_grants[cc]);

srsenb/src/stack/rrc/rrc_ue.cc

@@ -1127,6 +1127,12 @@ int rrc::ue::fill_scell_to_addmod_list(asn1::rrc::rrc_conn_recfg_r8_ies_s* conn_
     srslte::set_phy_cfg_t_scell_config(&scell_phy_rrc_ded.phy_cfg, cell);
     scell_phy_rrc_ded.configured = true;
 
+    // Set PUSCH dedicated configuration following 3GPP TS 36.331 R 10 Section 6.3.2 Radio resource control information
+    // elements - PUSCH-Config
+    //   One value applies for all serving cells with an uplink (the associated functionality is common i.e. not
+    //   performed independently for each cell).
+    scell_phy_rrc_ded.phy_cfg.ul_cfg.pusch.uci_offset = phy_rrc_dedicated_list[0].phy_cfg.ul_cfg.pusch.uci_offset;
+
     // Get corresponding eNB CC index
     scell_phy_rrc_ded.enb_cc_idx = cc_cfg->enb_cc_idx;
 

srsenb/test/phy/enb_phy_test.cc

@@ -187,8 +187,7 @@ public:
     }
   }
 
-  bool tx(srslte::rf_buffer_interface&          buffer,
-          const srslte::rf_timestamp_interface& tx_time) override
+  bool tx(srslte::rf_buffer_interface& buffer, const srslte::rf_timestamp_interface& tx_time) override
   {
     int err = SRSLTE_SUCCESS;
 
@@ -209,8 +208,7 @@ public:
     return err >= SRSLTE_SUCCESS;
   }
   void tx_end() override {}
-  bool rx_now(srslte::rf_buffer_interface&    buffer,
-              srslte::rf_timestamp_interface& rxd_time) override
+  bool rx_now(srslte::rf_buffer_interface& buffer, srslte::rf_timestamp_interface& rxd_time) override
   {
     int err = SRSLTE_SUCCESS;
 
@@ -981,8 +979,32 @@ public:
     return SRSLTE_SUCCESS;
   }
 
+  void fill_uci(uint32_t             cc_idx,
+                srslte_ue_ul_cfg_t&  ue_ul_cfg,
+                srslte_uci_data_t&   uci_data,
+                srslte_pdsch_ack_t&  pdsch_ack,
+                srslte_pusch_data_t& pusch_data)
+  {
+    // Generate scheduling request
+    srslte_ue_ul_gen_sr(&ue_ul_cfg, &sf_ul_cfg, &uci_data, (bool)(sf_ul_cfg.tti % 20 == 0));
+
+    // Generate Acknowledgements
+    srslte_ue_dl_gen_ack(&ue_dl_v[cc_idx]->cell, &sf_dl_cfg, &pdsch_ack, &uci_data);
+
+    if (uci_data.cfg.cqi.ri_len) {
+      last_ri[uci_data.cfg.cqi.scell_index] = uci_data.value.ri;
+    }
+
+    // Set UCI only for lowest serving cell index
+    pusch_data.uci                 = uci_data.value;
+    ue_ul_cfg.ul_cfg.pusch.uci_cfg = uci_data.cfg;
+    ue_ul_cfg.ul_cfg.pucch.uci_cfg = uci_data.cfg;
+  }
+
   int work_ul(srslte_pdsch_ack_t& pdsch_ack, srslte_uci_data_t& uci_data)
   {
+    bool first_pusch = true;
+
     // Zero all IQ UL buffers
     for (auto& buffer : buffers) {
       srslte_vec_cf_zero(buffer, SRSLTE_SF_LEN_PRB(ue_ul_v[0]->cell.nof_prb));
@@ -1022,28 +1044,15 @@ public:
         ue_ul_cfg.ul_cfg.pusch.softbuffers.tx = &softbuffer_tx;
         ue_ul_cfg.grant_available             = true;
         pdsch_ack.is_pusch_available          = true;
-      }
-
-      // Generate
-      if (i == 0) {
-        // Generate scheduling request
-        srslte_ue_ul_gen_sr(&ue_ul_cfg, &sf_ul_cfg, &uci_data, (bool)(sf_ul_cfg.tti % 20 == 0));
 
-        // Generate Acknowledgements
-        srslte_ue_dl_gen_ack(&ue_dl_v[cc_idx]->cell, &sf_dl_cfg, &pdsch_ack, &uci_data);
+        // Generate UCI data
+        if (first_pusch) {
+          fill_uci(cc_idx, ue_ul_cfg, uci_data, pdsch_ack, pusch_data);
 
-        if (uci_data.cfg.cqi.ri_len) {
-          last_ri[uci_data.cfg.cqi.scell_index] = uci_data.value.ri;
+          first_pusch = false;
         }
       }
 
-      // Set UCI only for PCel
-      if (i == 0) {
-        pusch_data.uci                 = uci_data.value;
-        ue_ul_cfg.ul_cfg.pusch.uci_cfg = uci_data.cfg;
-        ue_ul_cfg.ul_cfg.pucch.uci_cfg = uci_data.cfg;
-      }
-
       // Work UL
       TESTASSERT(srslte_ue_ul_encode(ue_ul_v[cc_idx], &sf_ul_cfg, &ue_ul_cfg, &pusch_data) >= SRSLTE_SUCCESS);
 
@@ -1054,6 +1063,31 @@ public:
       }
     }
 
+    // If no PUSCH, send PUCCH
+    if (first_pusch) {
+      uint32_t           cc_idx    = phy_rrc_cfg[0].enb_cc_idx;
+      srslte::phy_cfg_t& dedicated = phy_rrc_cfg[0].phy_cfg;
+
+      srslte_ue_ul_cfg_t ue_ul_cfg          = {};
+      ue_ul_cfg.ul_cfg                      = dedicated.ul_cfg;
+      ue_ul_cfg.ul_cfg.pusch.softbuffers.tx = &softbuffer_tx;
+      ue_ul_cfg.ul_cfg.pucch.rnti           = rnti;
+      ue_ul_cfg.cc_idx                      = 0; // SCell index
+
+      srslte_pusch_data_t pusch_data = {};
+
+      fill_uci(cc_idx, ue_ul_cfg, uci_data, pdsch_ack, pusch_data);
+
+      // Work UL PUCCH
+      TESTASSERT(srslte_ue_ul_encode(ue_ul_v[cc_idx], &sf_ul_cfg, &ue_ul_cfg, &pusch_data) >= SRSLTE_SUCCESS);
+
+      char str[256] = {};
+      srslte_ue_ul_info(&ue_ul_cfg, &sf_ul_cfg, &pusch_data.uci, str, sizeof(str));
+      if (str[0]) {
+        log_h.info("[UL INFO %d] %s\n", 0, str);
+      }
+    }
+
     // Write eNb Rx
     radio->write_rx(buffers, sf_len);
 
@@ -1226,6 +1260,8 @@ public:
     dedicated.ul_cfg.pucch.n1_pucch_an_cs[2][1]    = N_pucch_1 + 5;
     dedicated.ul_cfg.pucch.n1_pucch_an_cs[3][1]    = N_pucch_1 + 6;
     dedicated.ul_cfg.pusch.uci_offset.I_offset_ack = 7;
+    dedicated.ul_cfg.pusch.uci_offset.I_offset_ri  = 7;
+    dedicated.ul_cfg.pusch.uci_offset.I_offset_cqi = 7;
 
     // Configure UE PHY
     std::array<bool, SRSLTE_MAX_CARRIERS> activation = {}; ///< Activation/Deactivation vector

srsue/hdr/phy/cc_worker.h

@@ -52,6 +52,8 @@ public:
   void set_crnti(uint16_t rnti);
   void enable_pregen_signals(bool enabled);
 
+  void set_uci_periodic_cqi(srslte_uci_data_t* uci_data);
+
   bool work_dl_regular();
   bool work_dl_mbsfn(srslte_mbsfn_cfg_t mbsfn_cfg);
   bool work_ul(srslte_uci_data_t* uci_data);
@@ -84,7 +86,6 @@ private:
   /* Methods for UL */
   bool     encode_uplink(mac_interface_phy_lte::tb_action_ul_t* action, srslte_uci_data_t* uci_data);
   void     set_uci_sr(srslte_uci_data_t* uci_data);
-  void     set_uci_periodic_cqi(srslte_uci_data_t* uci_data);
   void     set_uci_aperiodic_cqi(srslte_uci_data_t* uci_data);
   void     set_uci_ack(srslte_uci_data_t* uci_data, bool is_grant_available, uint32_t dai_ul, bool is_pusch_available);
   uint32_t get_wideband_cqi();

srsue/hdr/phy/phy_common.h

@@ -130,6 +130,14 @@ public:
   void set_ul_pending_grant(srslte_dl_sf_cfg_t* sf, uint32_t cc_idx, srslte_dci_ul_t* dci);
   bool get_ul_pending_grant(srslte_ul_sf_cfg_t* sf, uint32_t cc_idx, uint32_t* pid, srslte_dci_ul_t* dci);
 
+  /**
+   * If there is a UL Grant it returns the lowest index component carrier that has a grant, otherwise it returns 0.
+   *
+   * @param tti_tx TTI in which the transmission is happening
+   * @return The number of carrier if a grant is available, otherwise 0
+   */
+  uint32_t get_ul_uci_cc(uint32_t tti_tx) const;
+
   void set_rar_grant_tti(uint32_t tti);
 
   void set_dl_pending_ack(srslte_dl_sf_cfg_t*         sf,
@@ -138,10 +146,7 @@ public:
                           srslte_pdsch_ack_resource_t resource);
   bool get_dl_pending_ack(srslte_ul_sf_cfg_t* sf, uint32_t cc_idx, srslte_pdsch_ack_cc_t* ack);
 
-  void worker_end(void*                   h,
-                  bool                    tx_enable,
-                  srslte::rf_buffer_t&    buffer,
-                  srslte::rf_timestamp_t& tx_time);
+  void worker_end(void* h, bool tx_enable, srslte::rf_buffer_t& buffer, srslte::rf_timestamp_t& tx_time);
 
   void set_cell(const srslte_cell_t& c);
   void set_nof_workers(uint32_t nof_workers);
@@ -184,7 +189,7 @@ private:
   std::mutex              mtch_mutex;
   std::condition_variable mtch_cvar;
 
-  uint32_t           nof_workers = 0;
+  uint32_t nof_workers = 0;
 
   bool is_pending_tx_end = false;
 
@@ -216,7 +221,7 @@ private:
     srslte_dci_ul_t dci;
   } pending_ul_grant_t;
   pending_ul_grant_t pending_ul_grant[TTIMOD_SZ][SRSLTE_MAX_CARRIERS] = {};
-  std::mutex         pending_ul_grant_mutex;
+  mutable std::mutex pending_ul_grant_mutex;
 
   typedef struct {
     bool                        enable;

srsue/src/phy/cc_worker.cc

@@ -85,10 +85,10 @@ cc_worker::cc_worker(uint32_t cc_idx_, uint32_t max_prb, srsue::phy_common* phy_
   phy->set_pdsch_cfg(&pmch_cfg.pdsch_cfg); // set same config in PMCH decoder
 
   // Define MBSFN subframes channel estimation and save default one
-  chest_mbsfn_cfg.filter_type          = SRSLTE_CHEST_FILTER_TRIANGLE;
-  chest_mbsfn_cfg.filter_coef[0]       = 0.1;
-  chest_mbsfn_cfg.estimator_alg        = SRSLTE_ESTIMATOR_ALG_INTERPOLATE;
-  chest_mbsfn_cfg.noise_alg            = SRSLTE_NOISE_ALG_PSS;
+  chest_mbsfn_cfg.filter_type    = SRSLTE_CHEST_FILTER_TRIANGLE;
+  chest_mbsfn_cfg.filter_coef[0] = 0.1;
+  chest_mbsfn_cfg.estimator_alg  = SRSLTE_ESTIMATOR_ALG_INTERPOLATE;
+  chest_mbsfn_cfg.noise_alg      = SRSLTE_NOISE_ALG_PSS;
 
   chest_default_cfg = ue_dl_cfg.chest_cfg;
 
@@ -641,17 +641,12 @@ bool cc_worker::work_ul(srslte_uci_data_t* uci_data)
     pid = phy->ul_pidof(CURRENT_TTI_TX, &sf_cfg_ul.tdd_config);
   }
 
-  /* Generate CQI reports if required, note that in case both aperiodic
-   * and periodic ones present, only aperiodic is sent (36.213 section 7.2) */
-  if (ul_grant_available && dci_ul.cqi_request) {
+  /*
+   * Generate aperiodic CQI report if required, note that in case both aperiodic and periodic ones present, only
+   * aperiodic is sent (36.213 section 7.2)
+   */
+  if (ul_grant_available and dci_ul.cqi_request and uci_data != nullptr) {
     set_uci_aperiodic_cqi(uci_data);
-  } else {
-    /* Check PCell and enabled secondary cells */
-    if (cc_idx == 0 || phy->scell_cfg[cc_idx].enabled) {
-      // 3GPP 36.213 Section 7.2
-      // If the UE is configured with more than one serving cell, it transmits CSI for activated serving cell(s) only.
-      set_uci_periodic_cqi(uci_data);
-    }
   }
 
   /* Send UL dci or HARQ information (from PHICH) to MAC and receive actions*/
@@ -690,14 +685,14 @@ bool cc_worker::work_ul(srslte_uci_data_t* uci_data)
   }
 
   // PCell sends SR and ACK
-  if (cc_idx == 0) {
+  if (uci_data != nullptr) {
     set_uci_sr(uci_data);
     // This must be called after set_uci_sr() and set_uci_*_cqi
     set_uci_ack(uci_data, ul_grant_available, dci_ul.dai, ul_action.tb.enabled);
   }
 
   // Generate uplink signal, include uci data on only PCell
-  signal_ready = encode_uplink(&ul_action, (cc_idx == 0) ? uci_data : nullptr);
+  signal_ready = encode_uplink(&ul_action, uci_data);
 
   // Prepare to receive ACK through PHICH
   if (ul_action.expect_ack) {
@@ -927,7 +922,7 @@ void cc_worker::set_config(srslte::phy_cfg_t& phy_cfg)
   }
 }
 
-void cc_worker::upd_config_dci(srslte_dci_cfg_t &dci_cfg)
+void cc_worker::upd_config_dci(srslte_dci_cfg_t& dci_cfg)
 {
   ue_dl_cfg.cfg.dci = dci_cfg;
 }

srsue/src/phy/phy_common.cc

@@ -364,6 +364,18 @@ bool phy_common::get_ul_pending_grant(srslte_ul_sf_cfg_t* sf, uint32_t cc_idx, u
   return ret;
 }
 
+uint32_t phy_common::get_ul_uci_cc(uint32_t tti_tx) const
+{
+  std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
+  for (uint32_t cc = 0; cc < args->nof_carriers; cc++) {
+    const pending_ul_grant_t& grant = pending_ul_grant[TTIMOD(tti_tx)][cc];
+    if (grant.enable) {
+      return cc;
+    }
+  }
+  return 0; // Return Primary cell
+}
+
 // SF->TTI at which PHICH is received
 void phy_common::set_ul_received_ack(srslte_dl_sf_cfg_t* sf,
                                      uint32_t            cc_idx,

srsue/src/phy/sf_worker.cc

@@ -245,12 +245,22 @@ void sf_worker::work_imp()
         srslte_uci_data_t uci_data;
         reset_uci(&uci_data);
 
-        // Loop through all carriers. Do in reverse order since control information from SCells is transmitted in PCell
+        uint32_t uci_cc_idx = phy->get_ul_uci_cc(TTI_TX(tti));
+
+        // Fill periodic CQI data; In case of periodic CSI report collision, lower carrier index have preference, so
+        // iterate through all carriers in inverse order.
         for (int carrier_idx = phy->args->nof_carriers - 1; carrier_idx >= 0; carrier_idx--) {
-          tx_signal_ready |= cc_workers[carrier_idx]->work_ul(&uci_data);
+          if (carrier_idx == 0 or phy->scell_cfg[carrier_idx].configured) {
+            cc_workers[carrier_idx]->set_uci_periodic_cqi(&uci_data);
+          }
+        }
+
+        // Loop through all carriers
+        for (uint32_t carrier_idx = 0; carrier_idx < phy->args->nof_carriers; carrier_idx++) {
+          tx_signal_ready |= cc_workers[carrier_idx]->work_ul(uci_cc_idx == carrier_idx ? &uci_data : nullptr);
 
           // Set signal pointer based on offset
-          tx_signal_ptr.set((uint32_t)carrier_idx, 0, phy->args->nof_rx_ant, cc_workers[carrier_idx]->get_tx_buffer(0));
+          tx_signal_ptr.set(carrier_idx, 0, phy->args->nof_rx_ant, cc_workers[carrier_idx]->get_tx_buffer(0));
         }
       }
     }