NR: assume all zero LCG is SBSR with 0 is received

srsenb/hdr/stack/mac/common/ue_buffer_manager.h

@@ -29,7 +29,7 @@ class ue_buffer_manager
 {
 protected:
   const static uint32_t     MAX_LC_ID     = isNR ? srsran::MAX_NR_NOF_BEARERS : srsran::MAX_LTE_LCID;
-  const static uint32_t     MAX_LCG_ID    = isNR ? 7 : 3;
+  const static uint32_t     MAX_LCG_ID    = isNR ? 7 : 3; // Should import from sched_interface and sched_nr_interface
   const static uint32_t     MAX_SRB_LC_ID = isNR ? srsran::MAX_NR_SRB_ID : srsran::MAX_LTE_SRB_ID;
   const static uint32_t     MAX_NOF_LCIDS = MAX_LC_ID + 1;
   const static uint32_t     MAX_NOF_LCGS  = MAX_LCG_ID + 1;

srsenb/hdr/stack/mac/nr/sched_nr_interface.h

@@ -31,6 +31,7 @@ const static size_t   SCHED_NR_MAX_TB           = 1;
 const static size_t   SCHED_NR_MAX_HARQ         = 16;
 const static size_t   SCHED_NR_MAX_BWP_PER_CELL = 2;
 const static size_t   SCHED_NR_MAX_LCID         = 32;
+const static size_t   SCHED_NR_MAX_LC_GROUP     = 7;
 
 class sched_nr_interface
 {

srsenb/src/stack/mac/nr/ue_nr.cc

@@ -99,7 +99,14 @@ int ue_nr::process_pdu(srsran::unique_byte_buffer_t pdu)
       case srsran::mac_sch_subpdu_nr::nr_lcid_sch_t::SHORT_TRUNC_BSR: {
         srsran::mac_sch_subpdu_nr::lcg_bsr_t sbsr = subpdu.get_sbsr();
         uint32_t buffer_size_bytes                = buff_size_field_to_bytes(sbsr.buffer_size, srsran::SHORT_BSR);
+        // Assume all LCGs are 0 if reported SBSR is 0
+        if (buffer_size_bytes == 0) {
+          for (uint32_t j = 0; j < SCHED_NR_MAX_LC_GROUP; j++) {
+            sched->ul_bsr(rnti, j, 0);
+          }
+        } else {
           sched->ul_bsr(rnti, sbsr.lcg_id, buffer_size_bytes);
+        }
       } break;
       case srsran::mac_sch_subpdu_nr::nr_lcid_sch_t::LONG_BSR:
         logger.info("LONG_BSR CE not implemented.");