[Epic-ID: ODUHIGH-406][Task-ID: ODUHIGH-422]F1AP Paging Message Handling at DUAPP
[o-du/l2.git] / src / du_app / du_cell_mgr.c
index 0eb2022..324b556 100644 (file)
 #include "du_mgr.h"
 #include "du_utils.h"
 #include "du_cell_mgr.h"
+#include "PCCH-Config.h"
 
 #ifdef O1_ENABLE
 
 #include "AlarmInterface.h"
-#include "ConfigInterface.h"
+#include "CmInterface.h"
 
 #endif
 
@@ -72,28 +73,36 @@ uint8_t duProcCellsToBeActivated(uint8_t *plmnStr, uint16_t nci, uint16_t nRPci)
       memset(tmpPlmn, 0, 4);
       buildPlmnId(duCb.cfgCellLst[cfgIdx]->cellInfo.nrEcgi.plmn, tmpPlmn);
       if(duCb.cfgCellLst[cfgIdx]->cellInfo.nrEcgi.cellId == nci &&
-           (strcmp((const char*)tmpPlmn, (const char*)plmnStr) == 0))
+            (strcmp((const char*)tmpPlmn, (const char*)plmnStr) == 0))
       {
-        cellCb = duCb.cfgCellLst[cfgIdx];
-        break;
+         cellCb = duCb.cfgCellLst[cfgIdx];
+         break;
       }
       else
       {
-        DU_LOG("\nERROR  -->  DU APP : No Cell found for NCI %d", nci);
-        return RFAILED;
+         DU_LOG("\nERROR  -->  DU APP : No Cell found for NCI %d", nci);
+         return RFAILED;
       }
    }
 
    cellCb->cellStatus = ACTIVATION_IN_PROGRESS; 
    cellCb->cellInfo.nrPci = nRPci;
 
-   duCb.actvCellLst[duCb.numActvCells++] = cellCb;
+   if((cmHashListInit(&(cellCb->pagingInfoMap), MAX_SFN, sizeof(DuPagInfoList),\
+                FALSE, CM_HASH_KEYTYPE_CONID, DU_APP_MEM_REGION, DU_POOL)) != ROK)
+   {
+      DU_LOG("ERROR  --> DU APP: Failed to Initialize the Paging Hash Map");
+      return RFAILED;             
+   }
+   duCb.actvCellLst[cellCb->cellId -1] = cellCb;
+   duCb.numActvCells++;
 
    if(duBuildAndSendMacCellCfg(cellCb->cellId) != ROK)
    {
       DU_LOG("\nERROR  -->  DU APP : macCellCfg build and send failed");
       /* Delete cell from actvCellList */
-      duCb.actvCellLst[--(duCb.numActvCells)] = NULLP;
+      duCb.actvCellLst[cellCb->cellId -1] = NULLP;
+      --(duCb.numActvCells);
       ret = RFAILED;
    }
    return ret;
@@ -138,11 +147,14 @@ void duProcF1SetupRsp()
 uint8_t duGetCellCb(uint16_t cellId, DuCellCb **cellCb)
 {
    uint8_t cellIdx = 0;
-   for(cellIdx=0; cellIdx<duCb.numActvCells; cellIdx++)
+
+   for(cellIdx=0; cellIdx < MAX_NUM_CELL; cellIdx++)
    {
-      if(duCb.actvCellLst[cellIdx]->cellId == cellId)
+      if(duCb.actvCellLst[cellIdx] && (duCb.actvCellLst[cellIdx]->cellId == cellId))
+      {
          *cellCb = duCb.actvCellLst[cellIdx];
-        break;
+             break;
+      }
    }
 
    if(!*cellCb)
@@ -154,6 +166,52 @@ uint8_t duGetCellCb(uint16_t cellId, DuCellCb **cellCb)
    return ROK;
 }
 
+/*****************************************************************
+* @brief Handles slot indication from MAC
+*
+* @details
+*
+*   Function : duHandleSlotInd
+*
+*   Functionality:
+*       Handles  slot indication from MAC
+* 
+*  @params[in] Post structure pointer
+*              SlotTimingInfo *slotIndInfo
+*  @return ROK     - success
+*          RFAILED - failure
+* 
+* 
+*****************************************************************/
+uint8_t duHandleSlotInd(Pst *pst, SlotTimingInfo *slotIndInfo)
+{
+   uint8_t cellIdx = 0, ret = ROK;
+   DuCellCb *duCellCb;
+
+   if(slotIndInfo)
+   {
+      GET_CELL_IDX(slotIndInfo->cellId, cellIdx);
+      duCellCb = duCb.actvCellLst[cellIdx];
+
+      if(duCellCb)
+      {
+         duCellCb->currSlotInfo.sfn = slotIndInfo->sfn;
+         duCellCb->currSlotInfo.slot = slotIndInfo->slot;
+      }
+      else
+      {
+         DU_LOG("\nERROR  -->  DU APP : CellId[%d] doesnot exist", slotIndInfo->cellId);
+         ret = RFAILED;
+      }
+      DU_FREE_SHRABL_BUF(pst->region, pst->pool, slotIndInfo, sizeof(SlotTimingInfo));
+   }
+   else
+   {
+      DU_LOG("\nERROR  -->  DU APP : Recevied null pointer from MAC");
+      ret = RFAILED;
+   }
+   return(ret);
+}
 /*******************************************************************
  *
  * @brief Handles cell up indication from MAC
@@ -173,7 +231,7 @@ uint8_t duGetCellCb(uint16_t cellId, DuCellCb **cellCb)
  * ****************************************************************/
 uint8_t duHandleCellUpInd(Pst *pst, OduCellId *cellId)
 {
-   DuCellCb *cellCb = NULLP;
+   DuCellCb *cellCb = NULLP; 
 
    if(cellId->cellId <=0 || cellId->cellId > MAX_NUM_CELL)
    {
@@ -190,11 +248,14 @@ uint8_t duHandleCellUpInd(Pst *pst, OduCellId *cellId)
       cellCb->cellStatus = ACTIVATED;
       gCellStatus = CELL_UP;
 
+      if(duCfgParam.tempSliceCfg.rrmPolicy)
+         BuildAndSendSliceConfigReq(duCfgParam.tempSliceCfg.rrmPolicy, duCfgParam.tempSliceCfg.totalRrmPolicy, duCfgParam.tempSliceCfg.totalSliceCount);
 #ifdef O1_ENABLE
       DU_LOG("\nINFO   -->  DU APP : Raise cell UP alarm for cell id=%d", cellId->cellId);
       raiseCellAlrm(CELL_UP_ALARM_ID, cellId->cellId);
       setCellOpState(cellId->cellId, ENABLED, ACTIVE);
 #endif
+
    }
 
    if((pst->selector == ODU_SELECTOR_LWLC) || (pst->selector == ODU_SELECTOR_TC))
@@ -229,7 +290,7 @@ uint8_t DuProcMacCellDeleteRsp(Pst *pst, MacCellDeleteRsp *deleteRsp)
       {
          GET_CELL_IDX(deleteRsp->cellId, cellIdx);
          DU_LOG("\nINFO   -->  DU APP : MAC CELL Delete Response : SUCCESS [CELL IDX : %d]", deleteRsp->cellId);
-         if(duCb.actvCellLst[cellIdx]->cellId == deleteRsp->cellId)
+         if(duCb.actvCellLst[cellIdx] && (duCb.actvCellLst[cellIdx]->cellId == deleteRsp->cellId))
          {
             memset(duCb.actvCellLst[cellIdx], 0, sizeof(DuCellCb));
             gCellStatus = CELL_DOWN;
@@ -356,23 +417,539 @@ uint8_t duSendCellDeletReq(uint16_t cellId)
       return RFAILED;  
    }
 
-   if(duCb.actvCellLst[cellIdx]->numActvUes)
+   if(duBuildAndSendMacCellStop(cellId) == RFAILED)
    {
-      DU_LOG("\nERROR  -->  DU APP : duSendCellDeletReq(): Active UEs still present in cellId[%d].\
-      Failed to delete cell", cellId);
+      DU_LOG("\nERROR  -->  DU APP : duSendCellDeletReq(): Failed to build and send cell stop request to MAC for\
+            cellId[%d]",cellId);
       return RFAILED;
    }
 
-   if(duBuildAndSendMacCellStop(cellId) == RFAILED)
+   return ROK;
+}
+
+/*******************************************************************
+ * @brief Find the PageInfo List from HashMap 
+ *
+ * @details
+ *
+ *    Function : findPagingInfoFromMap
+ *
+ *    Functionality: Search for the PageInfoList for a PF from HashMap
+ *
+ * @params[in] uint16_t pf, CmHashListCp *pagingInfoMap
+ *
+ * @return DuPagInfoList 
+ *
+ * ****************************************************************/
+DuPagInfoList* findPagingInfoFromMap(uint16_t pf, CmHashListCp *pagingInfoMap)
+{
+   DuPagInfoList *pagInfoLL = NULLP;
+
+   cmHashListFind(pagingInfoMap, (uint8_t *)&(pf), sizeof(uint16_t), 0, (PTR *)&pagInfoLL);
+   if(pagInfoLL == NULLP)
    {
-      DU_LOG("\nERROR  -->  DU APP : duSendCellDeletReq(): Failed to build and send cell stop request to MAC for\
-            cellId[%d]",cellId);
+      DU_LOG("\nDEBUG  --> DU APP: PF:%d doesnt exist in Map",pf);
+   }
+   return pagInfoLL;
+}
+
+/*******************************************************************
+ * @brief Handle the PageInfo List
+ *
+ * @details
+ *
+ *    Function : handlePageInfoLL
+ *
+ *    Functionality: Handling the (SEARCH,CREATE,DELETE) PageInfoList
+ *
+ * @params[in] uint8_t i_s, CmLListCp *pagInfoLL, ActionTypeLL action
+ *
+ * @return DuPagUeList 
+ *
+ * ****************************************************************/
+DuPagUeList* handlePageInfoLL(uint8_t i_s, CmLListCp *pagInfoLL, ActionTypeLL action)
+{
+   CmLList  *node = NULLP;
+   DuPagUeList *pagInfo = NULLP;
+   bool found = FALSE;
+
+   if(pagInfoLL == NULLP)
+   {
+      DU_LOG("\nERROR  -->  DU APP: PagInfo LL is empty");
+      return NULLP;
+   }
+   node = pagInfoLL->first;
+
+   while(node)
+   {
+      pagInfo = (DuPagUeList *)node->node;
+      if(pagInfo->i_s == i_s)
+      {
+         found = TRUE;
+         break;
+      }
+      node = node->next;
+   }
+
+   switch(action)
+   {
+      case SEARCH:
+         {
+            if(!found)
+            {
+               pagInfo = NULLP;
+            }
+            return pagInfo;
+         }
+
+      case CREATE:
+         {
+            if(node != NULLP)
+               return pagInfo;
+
+            /*Need to add a new node for this LC*/
+
+            /*List is empty; Initialize the LL ControlPointer*/
+            if(pagInfoLL->count == 0)
+            {
+               cmLListInit(pagInfoLL);
+            }
+
+            pagInfo = NULLP;
+            /*Allocate the List*/
+            DU_ALLOC(pagInfo, sizeof(DuPagUeList));
+            if(pagInfo)
+            {
+               pagInfo->i_s = i_s;
+            }
+            else
+            {
+               DU_LOG("\nERROR  -->  DU APP : Allocation of List failed,i_s:%d",i_s);
+               return NULLP;
+            }
+
+            if(duAddNodeToLList(pagInfoLL, pagInfo, NULLP) == RFAILED)
+            {
+               DU_LOG("\nERROR  -->  DU APP : failed to Add Node,i_s:%d",i_s);
+               DU_FREE(pagInfo, sizeof(DuPagUeList));
+               return NULLP;
+            }
+            return pagInfo;
+         }
+      case DELETE:
+         {
+            if(!found ||  pagInfo == NULLP)
+            {
+               DU_LOG("\nERROR  -->  DU APP: i_s:%d not found; thus Deletion unsuccessful",i_s);
+            }
+            else
+            {
+               if(duDelNodeFromLList(pagInfoLL, node) == ROK)
+                  DU_FREE(pagInfo, sizeof(DuPagUeList));
+
+               DU_LOG("\nDEBUG  -->  DU APP: i_s:%d Deleted successfully",i_s);
+            }
+            return NULLP;
+         }
+      default:
+         {
+            DU_LOG("\nERROR  -->  DU APP: Incorrect ActionType:%d on PageInfo List",action);
+         }
+   }
+   return NULLP;
+}
+
+/*******************************************************************
+ * @brief Handle the PageUe List
+ *
+ * @details
+ *
+ *    Function : handlePageUeLL
+ *
+ *    Functionality: Handling the (SEARCH,CREATE,DELETE) PageUeList
+ *
+ * @params[in] DuPagingMsg *pagingParam, CmLListCp *pageUeLL, ActionTypeLL
+ * action
+ *
+ * @return DuPagUeRecord 
+ *
+ * ****************************************************************/
+DuPagUeRecord* handlePageUeLL(DuPagingMsg *pagingParam, CmLListCp *pageUeLL, ActionTypeLL action)
+{
+   CmLList  *node = NULLP;
+   DuPagUeRecord *ueRecord = NULLP;
+   bool found = FALSE;
+
+   if(pageUeLL == NULLP)
+   {
+      DU_LOG("\nERROR  -->  DU APP: UE Page Record LL is empty");
+      return NULLP;
+   }
+   node = pageUeLL->first;
+
+   while(node)
+   {
+      ueRecord = (DuPagUeRecord *)node->node;
+      if(ueRecord && (ueRecord->pagUeId == pagingParam->pagUeId && 
+               ueRecord->sTmsi == pagingParam->sTmsi))
+      {
+         found = TRUE;
+         break;
+      }
+      node = node->next;
+   }
+
+   switch(action)
+   {
+      case SEARCH:
+         {
+            if(!found)
+            {
+               ueRecord = NULLP;
+            }
+            return ueRecord;
+         }
+
+      case CREATE:
+         {
+            if(node != NULLP)
+               return ueRecord;
+
+            /*Need to add a new node for this LC*/
+
+            /*List is empty; Initialize the LL ControlPointer*/
+            if(pageUeLL->count == 0)
+            {
+               cmLListInit(pageUeLL);
+            }
+
+            ueRecord = NULLP;
+            /*Allocate the List*/
+            DU_ALLOC(ueRecord, sizeof(DuPagUeRecord));
+            if(ueRecord)
+            {
+               ueRecord->pagUeId = pagingParam->pagUeId;
+               ueRecord->sTmsi = pagingParam->sTmsi;
+               ueRecord->pagPriority = pagingParam->pagPriority;
+            }
+            else
+            {
+               DU_LOG("\nERROR  -->  DU APP : Allocation of UE Record failed,ueId:%d",pagingParam->pagUeId);
+               return NULLP;
+            }
+
+            if(duAddNodeToLList(pageUeLL, ueRecord, NULLP) == RFAILED)
+            {
+               DU_LOG("\nERROR  -->  DU APP : failed to Add Ue Record Node,ueId:%d",pagingParam->pagUeId);
+               DU_FREE(ueRecord, sizeof(DuPagUeRecord));
+               return NULLP;
+            }
+            return ueRecord;
+         }
+      case DELETE:
+         {
+            if(!found ||  ueRecord == NULLP)
+            {
+               DU_LOG("\nERROR  -->  DU APP: UeId:%d not found; thus Deletion unsuccessful",pagingParam->pagUeId);
+            }
+            else
+            {
+               if(duDelNodeFromLList(pageUeLL, node) == ROK)
+                  DU_FREE(ueRecord, sizeof(DuPagUeRecord));
+
+               DU_LOG("\nDEBUG  -->  DU APP: UeId:%d Deleted successfully",pagingParam->pagUeId);
+            }
+            return NULLP;
+         }
+      default:
+         {
+            DU_LOG("\nERROR  -->  DU APP: Incorrect ActionType:%d on UeRecord",action);
+         }
+   }
+   return NULLP;
+}
+
+/*******************************************************************
+ * @brief Keeping the record of Paging having a particular SFN and index associated 
+ *
+ * @details
+ *
+ *    Function : insertPagingRecord 
+ *
+ *    Functionality:  Insert record of Paging assoc with particular SFN and index associated 
+ *
+ * @params[in] DuCellCb* cellCb, uint16_t iterations
+ *             DuPagingMsg  rcvdF1apPagingParam
+ *
+ * @return ROK     - success
+ *         RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t insertPagingRecord(DuCellCb* cellCb, DuPagingMsg *rcvdF1apPagingParam, uint16_t iterations)
+{
+   uint16_t maxIterations = 0; 
+   DuPagInfoList *pagInfoLLFromPF = NULLP;
+   DuPagUeList  *pageUeLL = NULLP;
+   DuPagUeRecord *ueRecord = NULLP;
+
+   //printPageList(&(cellCb->pagingInfoMap));
+
+   /*MAX Iteration : A UE can be paged at every T frames thus MAX determines
+    *how many Paging Frame(s) can be considered for Paging this UE*/
+   maxIterations = MAX_SFN/rcvdF1apPagingParam->T;
+   if(iterations >= maxIterations)
+   {
+      DU_LOG("\nERROR  --> DU APP: MAX Iterations reached for UEID:%d, thus Paging is dropped!", rcvdF1apPagingParam->pagUeId);
+      return RFAILED;
+   }
+
+   /*[Step1]: Extracting the PF from the HasMap between PF and PagingInfoList*/
+   pagInfoLLFromPF = findPagingInfoFromMap(rcvdF1apPagingParam->pagingFrame, &(cellCb->pagingInfoMap));
+   if(pagInfoLLFromPF != NULLP)
+   {
+      /*[Step2]: Extracting the PageInfo List for the Paging Indices(i_s)*/
+      pageUeLL = handlePageInfoLL(rcvdF1apPagingParam->i_s, &(pagInfoLLFromPF->pagInfoList), CREATE);
+
+      if(pageUeLL != NULLP)
+      {
+         /*[Step3]: Check whether MAX UE Record against this PF and i_s has reached*/
+         if(pageUeLL->pagUeList.count < MAX_PAGING_UE_RECORDS)
+         {
+            /*[Step4]: Insert the Paging Record to the end of the UE record List*/
+            ueRecord = handlePageUeLL(rcvdF1apPagingParam, &(pageUeLL->pagUeList), CREATE);
+
+            if(ueRecord == NULLP)
+            {
+               DU_LOG("\nERROR  --> DU APP: Unable to create UE Record in PagingList");
+               return RFAILED;
+            }
+            DU_LOG("\nDEBUG  --> DU APP: UE Record created successfully in PagingList");
+            return ROK;
+         }
+         else
+         {
+            /*Since MAX Page record has reached for this PF thus calculating and
+             *moving this UE to next Paging Cycle*/
+            DU_LOG("\nINFO   --> DU APP: Max Page Record reached for PagingFrame:%d",rcvdF1apPagingParam->pagingFrame);
+            rcvdF1apPagingParam->pagingFrame = ((rcvdF1apPagingParam->pagingFrame + rcvdF1apPagingParam->T) % MAX_SFN);
+            iterations++;
+
+            return insertPagingRecord(cellCb, rcvdF1apPagingParam, iterations);
+         }
+      }
+   }
+   /*Reaching here means that PF has no entry in the PageLists,
+    *Thus creating, Updating and inseritng the Paging Map, List and UE record.*/
+
+   DU_ALLOC(pagInfoLLFromPF, sizeof(DuPagInfoList));
+
+   if(pagInfoLLFromPF == NULLP)
+   {
+      DU_LOG("\nERROR  --> DU APP: PageInfo Map allocation failed.");
       return RFAILED;
    }
+   pagInfoLLFromPF->pf = rcvdF1apPagingParam->pagingFrame;
+   pageUeLL = handlePageInfoLL(rcvdF1apPagingParam->i_s, &(pagInfoLLFromPF->pagInfoList), CREATE);
+   ueRecord = handlePageUeLL(rcvdF1apPagingParam, &(pageUeLL->pagUeList), CREATE);
+   if(cmHashListInsert(&(cellCb->pagingInfoMap), (PTR)pagInfoLLFromPF, (uint8_t *)&(pagInfoLLFromPF->pf), sizeof(uint16_t)) == RFAILED)
+   {
+      DU_LOG("\nERROR  --> DU APP: Hash Map Insertion Failed for PF:%d.",rcvdF1apPagingParam->pagingFrame);
+   }
+
+   //printPageList(&(cellCb->pagingInfoMap));
+   return ROK;
+
+
+}
+
+/*******************************************************************
+ * @brief Calculate and fill paging information of a UE belongs to a particular cell
+ *
+ * @details
+ *
+ *    Function : calcAndFillPagingInfoInCellCb
+ *
+ *    Functionality: Calculate PO and i_s and 
+ *                   fill paging information of a UE in DuCellCb
+ *
+ * @params[in] DuCellCb* cellCb, uint8_t pagUeId, 
+ *             DuPagingMsg  rcvdF1apPagingParam
+ *
+ * @return ROK     - success
+ *         RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t calcAndFillPagingInfoInCellCb(DuCellCb* cellCb, DuPagingMsg *rcvdF1apPagingParam)
+{
+   uint8_t ns = 0;
+   uint16_t T=0, N=0, pagingFrame = 0, n = 0;
+   uint16_t currentSfn = 0, sfn = 0, newSfn = 0;
+   PcchCfg   duPcchCfg;
+
+   DU_LOG("\nINFO   --> DU APP : Start filling paging parameters in DuCellCb");
+   if(cellCb)
+   {
+      /* calculate paging frame and paging offset */
+      duPcchCfg = duCfgParam.sib1Params.srvCellCfgCommSib.dlCfg.pcchCfg;
+      rcvdF1apPagingParam->pagingFrameOffset = duPcchCfg.pageFrameOffset;
+      ns = duPcchCfg.ns;      
+
+      /*
+       * Fill the Value of T (DRX cycle of the UE)
+       * T = min(UE Specific DRX value allocated by upper layers, default DRX
+       * broadcast in System Information) */
+      if((rcvdF1apPagingParam->pagingDrxPres) && (duPcchCfg.dfltPagingCycle > rcvdF1apPagingParam->pagingDrx))
+      {
+         T = rcvdF1apPagingParam->pagingDrx;
+      } 
+      else
+      {
+         T = duPcchCfg.dfltPagingCycle;
+      }
+      rcvdF1apPagingParam->T = T;
+
+       /* N= number of total paging frames in T */
+
+      switch(duPcchCfg.nAndPagingFrmOffsetType)
+      {
+         case PCCH_Config__nAndPagingFrameOffset_PR_oneT:
+            N = T;
+            break;
+         case PCCH_Config__nAndPagingFrameOffset_PR_halfT:
+            N = T/2;
+            break;
+         case PCCH_Config__nAndPagingFrameOffset_PR_quarterT:
+            N = T/4;
+            break;
+         case PCCH_Config__nAndPagingFrameOffset_PR_oneEighthT:
+            N = T/8;
+            break;
+         case PCCH_Config__nAndPagingFrameOffset_PR_oneSixteenthT:
+            N = T/16;
+            break;
+         default:
+            N = T;
+            break;
+      }
+
+       /* calculate the Value of pagingFrame */
+      /*Refer: 38.304 Sec 7.1: (SFN + PF_offset) mod T = (T div N)*(UE_ID mod N)*/
+      //RHS of above formula
+      pagingFrame = (T / N) * ((rcvdF1apPagingParam->pagUeId) % N);
+
+      //LHS of above formula
+      if(pagingFrame)
+      {
+         pagingFrame = (pagingFrame - rcvdF1apPagingParam->pagingFrameOffset)%T;
+      }
+      else /*Paging Frame = 0 so thus PF will be calculated on Paging Cycle*/
+      {
+         pagingFrame = (T - rcvdF1apPagingParam->pagingFrameOffset)%T;
+      }
+
+      /*Paging Frame(SFN for Paging) has to be determined from current SFN. */
+      /*For eg: If T =128, PF(Calculated above) = 20; SFN can be 20,148,276,...
+       * If currSFN is running as 200 then (newSFN % T) == (T/N)*(UE_ID%N)
+       *Thus SFN at which paging has to be sent needs to be delayed and newSFN = 276*/
+
+      currentSfn = cellCb->currSlotInfo.sfn;
+
+      /*Multiplication Factor(x) to find the next best SFN to process paging*/
+
+      /*Below calculation will determine in which nth cycle of T (DRX cycle),new PF
+       * may fall(Delayed one)*/
+      if(currentSfn > pagingFrame)
+      {
+         n  = ((currentSfn - pagingFrame) / T) + 1;
+      }
+      else
+      {
+         n  = ((pagingFrame - currentSfn) / T) + 1;
+      }
+
+      newSfn = pagingFrame + T * n;
+
+      /*When pagingFrame is future from currSFN then pagingFrame will be used 
+       * else pagingFrame is delayed thus newSFN will be used.*/
+      if(currentSfn <= pagingFrame)
+      {
+         if(pagingFrame > currentSfn + PAGING_SCHED_DELTA)
+         {
+            sfn = pagingFrame;
+         }
+         else
+         {
+            sfn = newSfn;
+         }
+      }
+      else
+      {
+         
+         if(newSfn > currentSfn + PAGING_SCHED_DELTA)
+         {
+            sfn = newSfn;
+         }
+         else /*If newSFN is near to currSFN then delay it more by T*/
+         {
+            newSfn = newSfn + T;
+            sfn = newSfn;
+         }
+      }
+      rcvdF1apPagingParam->pagingFrame =  (sfn % MAX_SFN);
+      rcvdF1apPagingParam->i_s = ((uint32_t)(floor(rcvdF1apPagingParam->pagUeId / N)) % ns);
 
+      DU_LOG("\nINFO  --> DU APP : Successfully filled paging parameter in DuCellCb");
+      memcpy(&cellCb->tmpPagingInfoOfUe, rcvdF1apPagingParam, sizeof(DuPagingMsg));
+   }
+   else
+   {
+      DU_LOG("\nINFO  --> DU APP : calcAndFillPagingInfoInCellCb(): Received null pointer");
+      return RFAILED;
+   }
    return ROK;
 }
 
+/*******************************************************************
+ * @brief Paging Processing on a particular cell 
+ *
+ * @details
+ *
+ *    Function : processPagingMsg
+ *
+ *    Functionality: Process Paging on a particular cell 
+ *
+ * @params[in] uint16_t cellId
+ *             DuPagingMsg  rcvdF1apPagingParam
+ *
+ * @return ROK     - success
+ *         RFAILED - failure
+ *
+ * ****************************************************************/
+uint8_t processPagingMsg(uint16_t cellId, DuPagingMsg *rcvdF1apPagingParam)
+{
+   uint16_t cellIdx = 0, iteration = 0;
+
+   GET_CELL_IDX(cellId, cellIdx);
+
+   if(duCb.actvCellLst[cellIdx] == NULLP || duCb.actvCellLst[cellIdx]->cellId != cellId)
+   {
+      DU_LOG("\nERROR  -->  DU APP : processPagingMsg(): CellId[%d] is not found", cellId);
+      return RFAILED;
+   }
+   
+   if(calcAndFillPagingInfoInCellCb(duCb.actvCellLst[cellIdx], rcvdF1apPagingParam) != ROK)
+   {
+      DU_LOG("\nERROR  --> DU APP : CellCb:%d not present to fill UE Paging Information",cellId);
+      return RFAILED;
+   }
+   if(insertPagingRecord(duCb.actvCellLst[cellIdx], rcvdF1apPagingParam, iteration) != ROK)
+   {
+      DU_LOG("\nERROR  --> DU APP : Insertion Failed ofUE Paging Information");
+      return RFAILED;
+   }
+   return ROK;
+
+}
 /**********************************************************************
   End of file
  **********************************************************************/