+ return ret;
+}
+
+/*******************************************************************
+ *
+ * @brief Builds and sends cell start request to MAC
+ *
+ * @details
+ *
+ * Function : duBuildAndSendMacCellStart
+ *
+ * Functionality:
+ * Builds and sends cell start request to MAC
+ *
+ * @params[in]
+ * @return ROK - success
+ * RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t duBuildAndSendMacCellStart()
+{
+ Pst pst;
+ OduCellId *cellId = NULL;
+
+ DU_LOG("\nINFO --> DU APP : Building and Sending cell start request to MAC");
+
+ /* Send Cell Start Request to MAC */
+ DU_ALLOC_SHRABL_BUF(cellId, sizeof(OduCellId));
+ if(!cellId)
+ {
+ DU_LOG("\nERROR --> DU APP : Memory alloc failed while building cell start request");
+ return RFAILED;
+ }
+
+ for(uint8_t id = 0; id < duCb.numActvCells; id++)
+ {
+ if(duCb.actvCellLst[id])
+ {
+ cellId->cellId = duCb.actvCellLst[id]->cellId;
+
+ /* Fill Pst */
+ FILL_PST_DUAPP_TO_MAC(pst, EVENT_MAC_CELL_START);
+
+ return (*packMacCellStartOpts[pst.selector])(&pst, cellId);
+ }
+ }
+ return ROK;
+}
+
+/*******************************************************************
+ *
+ * @brief Builds and sends cell stop request to MAC
+ *
+ * @details
+ *
+ * Function : duBuildAndSendMacCellStop
+ *
+ * Functionality:
+ * Builds and sends cell stop request to MAC
+ *
+ * @params[in]
+ * @return ROK - success
+ * RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t duBuildAndSendMacCellStop(uint16_t cellId)
+{
+ Pst pst;
+ uint16_t cellIdx=0;
+ OduCellId *oduCellId = NULL;
+
+ DU_LOG("\nINFO --> DU APP : Building and Sending cell stop request to MAC");
+
+ GET_CELL_IDX(cellId, cellIdx);
+ if(duCb.actvCellLst[cellIdx] != NULLP)
+ {
+ /* Send Cell Stop Request to MAC */
+ DU_ALLOC_SHRABL_BUF(oduCellId, sizeof(OduCellId));
+ if(!oduCellId)
+ {
+ DU_LOG("\nERROR --> DU APP : duBuildAndSendMacCellStop(): Memory allocation failed ");
+ return RFAILED;
+ }
+ memset(oduCellId, 0, sizeof(OduCellId));
+ oduCellId->cellId = duCb.actvCellLst[cellIdx]->cellId;
+
+ /* Fill Pst */
+ FILL_PST_DUAPP_TO_MAC(pst, EVENT_MAC_CELL_STOP);
+
+ return (*packMacCellStopOpts[pst.selector])(&pst, oduCellId);
+ }
+ else
+ {
+ DU_LOG("\nERROR --> DU APP : duBuildAndSendMacCellStop(): cellId[%d] doesnot exists", cellId);
+ return RFAILED;
+ }
+ return ROK;
+}
+
+/*******************************************************************
+ *
+ * @brief Handles stop indication from MAC
+ *
+ * @details
+ *
+ * Function : duHandleStopInd
+ *
+ * Functionality:
+ * Handles stop indication from MAC
+ *
+ * @params[in] Post structure pointer
+ * @return ROK - success
+ * RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t duHandleStopInd(Pst *pst, OduCellId *cellId)
+{
+ DuCellCb *cellCb = NULLP;
+
+ if(cellId->cellId <=0 || cellId->cellId > MAX_NUM_CELL)
+ {
+ DU_LOG("\nERROR --> DU APP : Invalid Cell Id %d in duHandleStopInd()", cellId->cellId);
+ }
+
+ if(duGetCellCb(cellId->cellId, &cellCb) != ROK)
+ return RFAILED;
+
+ if((cellCb->cellStatus == ACTIVATED) || (cellCb->cellStatus == DELETION_IN_PROGRESS))
+ {
+ DU_LOG("\nINFO --> DU APP : 5G-NR Cell %d is DOWN", cellId->cellId);
+ if(sendCellDeleteReqToMac(cellId->cellId) == RFAILED)
+ {
+ DU_LOG("\nERROR --> DU APP : duHandleStopInd(): Failed to send Cell delete req to MAC for\
+ cellId[%d]", cellId->cellId);
+ return RFAILED;
+ }
+
+
+#ifdef O1_ENABLE
+ DU_LOG("\nINFO --> DU APP : Raise cell down alarm for cell id=%d", cellId->cellId);
+ raiseCellAlrm(CELL_DOWN_ALARM_ID, cellId->cellId);
+ setCellOpState(cellId->cellId, DISABLED, INACTIVE);
+#endif
+ }
+
+ if((pst->selector == ODU_SELECTOR_LWLC) || (pst->selector == ODU_SELECTOR_TC))
+ DU_FREE_SHRABL_BUF(MAC_MEM_REGION, pst->pool, cellId, sizeof(OduCellId));
+
+ cellCb->cellStatus = CELL_OUT_OF_SERVICE; //TODO: cell status must be set to OOS after all UE and cell cleanup which is not
+ //supported now
+
+ return ROK;
+}
+
+/*******************************************************************
+ *
+ * @brief Handles slot indication from MAC
+ *
+ * @details
+ *
+ * Function : duHandleUlCcchInd
+ *
+ * Functionality:
+ * Handles UL CCCH indication from MAC
+ *
+ * @params[in] Post structure pointer
+ * UL CCCH Ind pointer
+ * @return ROK - success
+ * RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t duHandleUlCcchInd(Pst *pst, UlCcchIndInfo *ulCcchIndInfo)
+{
+
+ DU_LOG("\nINFO --> DU APP : UL CCCH Indication received");