for ff in glob('%s/*.json'%folder)[:]:
        try:
            events = json.load(open(ff))
        except JSONDecodeError:
            undecodable_jsons.append(ff)
        for event in events[1:]:
            h = event['CHRHEADER']
            eventid = h['EventId']
            callid  = h['CallId']
            serv_cellid = h['eNodeBId']*256+h['CellId']
            timestamp = calTimestamp(h)
            if eventid == 4097: # PUBLIC_INFORMATION
                sig = event_signatures[eventid]
                b = event[sig['name']]
                mtmsi = b[sig['id']]
                mtmsi_map[callid] = mtmsi
            if eventid == 4866: # PERIOD_INTRA_FREQ_MR_MDT
                sig = event_signatures[eventid]
                b = event[sig['name']]
                n = b[sig['n']]
                if not n:
                    continue
                if not b['Location_Info_Present']:
                    continue
                if not b['ShapeType'] == 2:
                    continue
                shape = sig['shape']
                usr_loc_dict = b[shape]

                # %%%%
                lat = usr_loc_dict['Degrees_Latitude']
                lon = usr_loc_dict['Degrees_Longitude']
                # %%%%
                nCell_arr = b[sig['array']%n]
                nCell_arr_out = []
                serv_EARFCN = earfcn_map[serv_cellid]
                for i in range(n):
                    pci = nCell_arr[i][sig['pci']]
                    # since intra nbr_EARFCN==serv_EARFCN
                    triad = (serv_cellid,pci,serv_EARFCN)
                    try:
                        nbr_cell_id = pci_map[(triad)]
                    except KeyError:
                        unknown_pci_keys.add(triad)
                        continue
                    else:
                        nCell_arr[i]['EARFCN'] = serv_EARFCN
                        nCell_arr[i]['Current_CI'] = nbr_cell_id
                        nCell_arr_out.append(nCell_arr[i])
                serv_cell_rsrp = b['Serving_Cell_RSRP']
                serv_cell_rsrq = b['Serving_Cell_RSRQ']
                if nCell_arr_out:
                    power_map[callid][serv_cellid][timestamp] = \
                    [serv_cell_rsrp,serv_cell_rsrq,\
                    nCell_arr_out,usr_loc_dict,serv_EARFCN]
                    stats['Resolved_INTRA_MDT']+=1
            if eventid == 4867: # PERIOD_INTER_FREQ_MR_MDT
                sig = event_signatures[eventid]
                b = event[sig['name']]
                n = b[sig['n']]
                if not n:
                    continue
                if not b['Location_Info_Present']:
                    continue
                if not b['ShapeType'] == 2:
                    continue
                shape = sig['shape']
                usr_loc_dict = b[shape]
                nCell_arr = b[sig['array']%n]
                nCell_arr_out = []
                serv_EARFCN = earfcn_map[serv_cellid]
                for i in range(n):
                    pci = nCell_arr[i][sig['pci']]
                    nbr_EARFCN = nCell_arr[i][sig['arfcn']]
                    EUTRAN_cell_id = nCell_arr[i][sig['ci']]
                    if EUTRAN_cell_id == 4294967295:
                        continue # invalid cell
                    triad = (serv_cellid,pci,nbr_EARFCN)
                    if eutran: # don't use pci-map
                        nbr_cell_id = EUTRAN_cell_id
                        nCell_arr[i]['Current_CI'] = nbr_cell_id
                        nCell_arr[i]['EARFCN'] = nbr_EARFCN
                        nCell_arr_out.append(nCell_arr[i])
                    else:
                        try:
                            nbr_cell_id = pci_map[(triad)]
                        except KeyError:
                            unknown_pci_keys.add(triad)
                            continue
                        else:
                            if EUTRAN_cell_id!=nbr_cell_id:
                                if debug:
                                    print('Wrong Neighbouring Cell Id?')
                                    print('\tEUTRAN_Cell_ID:%i'%EUTRAN_cell_id)
                                    print('\tResolved From Map:%i'%nbr_cell_id)
                            else:
                                nCell_arr[i]['EARFCN'] = nbr_EARFCN
                                nCell_arr[i]['Current_CI'] = nbr_cell_id
                                nCell_arr_out.append(nCell_arr[i])
                serv_cell_rsrp = b['Serving_Cell_RSRP']
                serv_cell_rsrq = b['Serving_Cell_RSRQ']
                if nCell_arr_out:
                    if (callid,timestamp) in power_map:
                        if debug:
                            print('Same CallId-Timstamp')
                            print('\t',(callid,timestamp))
                            print('\t',power_map[(callid,timestamp)])
                            print('\t',[serv_cellid,serv_cell_rsrp,serv_cell_rsrq,\
                                   nCell_arr_out,usr_loc_dict])
                    power_map[callid][serv_cellid][timestamp] = \
                    [serv_cell_rsrp,serv_cell_rsrq,\
                    nCell_arr_out,usr_loc_dict,serv_EARFCN]
                    stats['Resolved_INTER_MDT']+=1
            if eventid == 4626: # PERIOD_PRIVATE_UE_MEASUREMENT
                sig = event_signatures[eventid]
                b = event[sig['name']]
                ta = b[sig['ta']]
                delay_map[callid][serv_cellid][timestamp] = ta
            if eventid == 4097: # PUBLIC_INFORMATION
                sig = event_signatures[eventid]
                b = event[sig['name']]
                mtmsi_map[callid] = b[sig['id']]