Tweak BSR timers in RRC to have constant UL throughput

The previous values of the BSR timers would "starve" the UE: to my
understanding, constant UL traffic would not make any BSR timer expire,
and thus, no new BSRs were sent by the UE. However, since they were too
infrequent, the gNB thought there was no data anymore after serving the
UE for some slots.  Hence, reduce the timers to have constant UE buffer
feedback. Maybe they have to be increased if we ever have many UEs...

openair2/RRC/NR/rrc_gNB_reconfig.c

@@ -186,8 +186,8 @@ void fill_default_secondaryCellGroup(NR_ServingCellConfigCommon_t *servingcellco
   secondaryCellGroup->mac_CellGroupConfig->drx_Config = NULL;
   secondaryCellGroup->mac_CellGroupConfig->schedulingRequestConfig = NULL;
   secondaryCellGroup->mac_CellGroupConfig->bsr_Config=calloc(1,sizeof(*secondaryCellGroup->mac_CellGroupConfig->bsr_Config));
-  secondaryCellGroup->mac_CellGroupConfig->bsr_Config->periodicBSR_Timer = NR_BSR_Config__periodicBSR_Timer_sf80;
-  secondaryCellGroup->mac_CellGroupConfig->bsr_Config->retxBSR_Timer     = NR_BSR_Config__retxBSR_Timer_sf320;
+  secondaryCellGroup->mac_CellGroupConfig->bsr_Config->periodicBSR_Timer = NR_BSR_Config__periodicBSR_Timer_sf32;
+  secondaryCellGroup->mac_CellGroupConfig->bsr_Config->retxBSR_Timer     = NR_BSR_Config__retxBSR_Timer_sf160;
   secondaryCellGroup->mac_CellGroupConfig->tag_Config=calloc(1,sizeof(*secondaryCellGroup->mac_CellGroupConfig->tag_Config));
   secondaryCellGroup->mac_CellGroupConfig->tag_Config->tag_ToReleaseList = NULL;
   secondaryCellGroup->mac_CellGroupConfig->tag_Config->tag_ToAddModList  = calloc(1,sizeof(*secondaryCellGroup->mac_CellGroupConfig->tag_Config->tag_ToAddModList));