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5G NR & LTE Paging Calculator (TS 38.304)

Professional 3GPP Reference: Calculate Paging Frames (PF) and Occasions (PO) with SCS and S-TMSI support.

Next monitoring occasion
Starting frame (SFN)
0
Subframe
0
Monitoring slot
0
PO index
#0
Cycle live feed
Monitoring in
0 ms

Paging configuration

Input parameters for PO/PF algorithms

Cycle length (T) / Duration: 1.28s

Paging frames per cycle / POs per PF

PF_Offset & SCS (5G NR Only)

Math Breakdown (3GPP Logic)

UE_ID277
N (Min(T, nB))128
Ns1
i_s (PO Index)0
Formula: PF = (SFN mod T) = (T / N) * (UE_ID mod N) | PO = i_s = floor(UE_ID / N) mod Ns

PEI extension (Rel-17/19)

Calculate Paging Early Indication monitoring occasions

Enable PEI

Paging distribution grid (SFN 0-1023)

High-precision map of all radio frames in the hyper-cycle
Paging Frame (PF)
Standby / Sleep
0
4
8
12
16
20
24
28
0000
PF
System Frame0
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Slot Mapping0
PO Index#0
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No paging occasion
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No paging occasion
0384
PF
System Frame384
Subframe0
Slot Mapping0
PO Index#0
System Frame385
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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PO Index#0
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
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No paging occasion
System Frame663
No paging occasion
System Frame664
No paging occasion
System Frame665
No paging occasion
System Frame666
No paging occasion
System Frame667
No paging occasion
System Frame668
No paging occasion
System Frame669
No paging occasion
System Frame670
No paging occasion
System Frame671
No paging occasion
0672
System Frame672
No paging occasion
System Frame673
No paging occasion
System Frame674
No paging occasion
System Frame675
No paging occasion
System Frame676
No paging occasion
System Frame677
No paging occasion
System Frame678
No paging occasion
System Frame679
No paging occasion
System Frame680
No paging occasion
System Frame681
No paging occasion
System Frame682
No paging occasion
System Frame683
No paging occasion
System Frame684
No paging occasion
System Frame685
No paging occasion
System Frame686
No paging occasion
System Frame687
No paging occasion
System Frame688
No paging occasion
System Frame689
No paging occasion
System Frame690
No paging occasion
System Frame691
No paging occasion
System Frame692
No paging occasion
System Frame693
No paging occasion
System Frame694
No paging occasion
System Frame695
No paging occasion
System Frame696
No paging occasion
System Frame697
No paging occasion
System Frame698
No paging occasion
System Frame699
No paging occasion
System Frame700
No paging occasion
System Frame701
No paging occasion
System Frame702
No paging occasion
System Frame703
No paging occasion
0704
System Frame704
No paging occasion
System Frame705
No paging occasion
System Frame706
No paging occasion
System Frame707
No paging occasion
System Frame708
No paging occasion
System Frame709
No paging occasion
System Frame710
No paging occasion
System Frame711
No paging occasion
System Frame712
No paging occasion
System Frame713
No paging occasion
System Frame714
No paging occasion
System Frame715
No paging occasion
System Frame716
No paging occasion
System Frame717
No paging occasion
System Frame718
No paging occasion
System Frame719
No paging occasion
System Frame720
No paging occasion
System Frame721
No paging occasion
System Frame722
No paging occasion
System Frame723
No paging occasion
System Frame724
No paging occasion
System Frame725
No paging occasion
System Frame726
No paging occasion
System Frame727
No paging occasion
System Frame728
No paging occasion
System Frame729
No paging occasion
System Frame730
No paging occasion
System Frame731
No paging occasion
System Frame732
No paging occasion
System Frame733
No paging occasion
System Frame734
No paging occasion
System Frame735
No paging occasion
0736
System Frame736
No paging occasion
System Frame737
No paging occasion
System Frame738
No paging occasion
System Frame739
No paging occasion
System Frame740
No paging occasion
System Frame741
No paging occasion
System Frame742
No paging occasion
System Frame743
No paging occasion
System Frame744
No paging occasion
System Frame745
No paging occasion
System Frame746
No paging occasion
System Frame747
No paging occasion
System Frame748
No paging occasion
System Frame749
No paging occasion
System Frame750
No paging occasion
System Frame751
No paging occasion
System Frame752
No paging occasion
System Frame753
No paging occasion
System Frame754
No paging occasion
System Frame755
No paging occasion
System Frame756
No paging occasion
System Frame757
No paging occasion
System Frame758
No paging occasion
System Frame759
No paging occasion
System Frame760
No paging occasion
System Frame761
No paging occasion
System Frame762
No paging occasion
System Frame763
No paging occasion
System Frame764
No paging occasion
System Frame765
No paging occasion
System Frame766
No paging occasion
System Frame767
No paging occasion
0768
PF
System Frame768
Subframe0
Slot Mapping0
PO Index#0
System Frame769
No paging occasion
System Frame770
No paging occasion
System Frame771
No paging occasion
System Frame772
No paging occasion
System Frame773
No paging occasion
System Frame774
No paging occasion
System Frame775
No paging occasion
System Frame776
No paging occasion
System Frame777
No paging occasion
System Frame778
No paging occasion
System Frame779
No paging occasion
System Frame780
No paging occasion
System Frame781
No paging occasion
System Frame782
No paging occasion
System Frame783
No paging occasion
System Frame784
No paging occasion
System Frame785
No paging occasion
System Frame786
No paging occasion
System Frame787
No paging occasion
System Frame788
No paging occasion
System Frame789
No paging occasion
System Frame790
No paging occasion
System Frame791
No paging occasion
System Frame792
No paging occasion
System Frame793
No paging occasion
System Frame794
No paging occasion
System Frame795
No paging occasion
System Frame796
No paging occasion
System Frame797
No paging occasion
System Frame798
No paging occasion
System Frame799
No paging occasion
0800
System Frame800
No paging occasion
System Frame801
No paging occasion
System Frame802
No paging occasion
System Frame803
No paging occasion
System Frame804
No paging occasion
System Frame805
No paging occasion
System Frame806
No paging occasion
System Frame807
No paging occasion
System Frame808
No paging occasion
System Frame809
No paging occasion
System Frame810
No paging occasion
System Frame811
No paging occasion
System Frame812
No paging occasion
System Frame813
No paging occasion
System Frame814
No paging occasion
System Frame815
No paging occasion
System Frame816
No paging occasion
System Frame817
No paging occasion
System Frame818
No paging occasion
System Frame819
No paging occasion
System Frame820
No paging occasion
System Frame821
No paging occasion
System Frame822
No paging occasion
System Frame823
No paging occasion
System Frame824
No paging occasion
System Frame825
No paging occasion
System Frame826
No paging occasion
System Frame827
No paging occasion
System Frame828
No paging occasion
System Frame829
No paging occasion
System Frame830
No paging occasion
System Frame831
No paging occasion
0832
System Frame832
No paging occasion
System Frame833
No paging occasion
System Frame834
No paging occasion
System Frame835
No paging occasion
System Frame836
No paging occasion
System Frame837
No paging occasion
System Frame838
No paging occasion
System Frame839
No paging occasion
System Frame840
No paging occasion
System Frame841
No paging occasion
System Frame842
No paging occasion
System Frame843
No paging occasion
System Frame844
No paging occasion
System Frame845
No paging occasion
System Frame846
No paging occasion
System Frame847
No paging occasion
System Frame848
No paging occasion
System Frame849
No paging occasion
System Frame850
No paging occasion
System Frame851
No paging occasion
System Frame852
No paging occasion
System Frame853
No paging occasion
System Frame854
No paging occasion
System Frame855
No paging occasion
System Frame856
No paging occasion
System Frame857
No paging occasion
System Frame858
No paging occasion
System Frame859
No paging occasion
System Frame860
No paging occasion
System Frame861
No paging occasion
System Frame862
No paging occasion
System Frame863
No paging occasion
0864
System Frame864
No paging occasion
System Frame865
No paging occasion
System Frame866
No paging occasion
System Frame867
No paging occasion
System Frame868
No paging occasion
System Frame869
No paging occasion
System Frame870
No paging occasion
System Frame871
No paging occasion
System Frame872
No paging occasion
System Frame873
No paging occasion
System Frame874
No paging occasion
System Frame875
No paging occasion
System Frame876
No paging occasion
System Frame877
No paging occasion
System Frame878
No paging occasion
System Frame879
No paging occasion
System Frame880
No paging occasion
System Frame881
No paging occasion
System Frame882
No paging occasion
System Frame883
No paging occasion
System Frame884
No paging occasion
System Frame885
No paging occasion
System Frame886
No paging occasion
System Frame887
No paging occasion
System Frame888
No paging occasion
System Frame889
No paging occasion
System Frame890
No paging occasion
System Frame891
No paging occasion
System Frame892
No paging occasion
System Frame893
No paging occasion
System Frame894
No paging occasion
System Frame895
No paging occasion
0896
PF
System Frame896
Subframe0
Slot Mapping0
PO Index#0
System Frame897
No paging occasion
System Frame898
No paging occasion
System Frame899
No paging occasion
System Frame900
No paging occasion
System Frame901
No paging occasion
System Frame902
No paging occasion
System Frame903
No paging occasion
System Frame904
No paging occasion
System Frame905
No paging occasion
System Frame906
No paging occasion
System Frame907
No paging occasion
System Frame908
No paging occasion
System Frame909
No paging occasion
System Frame910
No paging occasion
System Frame911
No paging occasion
System Frame912
No paging occasion
System Frame913
No paging occasion
System Frame914
No paging occasion
System Frame915
No paging occasion
System Frame916
No paging occasion
System Frame917
No paging occasion
System Frame918
No paging occasion
System Frame919
No paging occasion
System Frame920
No paging occasion
System Frame921
No paging occasion
System Frame922
No paging occasion
System Frame923
No paging occasion
System Frame924
No paging occasion
System Frame925
No paging occasion
System Frame926
No paging occasion
System Frame927
No paging occasion
0928
System Frame928
No paging occasion
System Frame929
No paging occasion
System Frame930
No paging occasion
System Frame931
No paging occasion
System Frame932
No paging occasion
System Frame933
No paging occasion
System Frame934
No paging occasion
System Frame935
No paging occasion
System Frame936
No paging occasion
System Frame937
No paging occasion
System Frame938
No paging occasion
System Frame939
No paging occasion
System Frame940
No paging occasion
System Frame941
No paging occasion
System Frame942
No paging occasion
System Frame943
No paging occasion
System Frame944
No paging occasion
System Frame945
No paging occasion
System Frame946
No paging occasion
System Frame947
No paging occasion
System Frame948
No paging occasion
System Frame949
No paging occasion
System Frame950
No paging occasion
System Frame951
No paging occasion
System Frame952
No paging occasion
System Frame953
No paging occasion
System Frame954
No paging occasion
System Frame955
No paging occasion
System Frame956
No paging occasion
System Frame957
No paging occasion
System Frame958
No paging occasion
System Frame959
No paging occasion
0960
System Frame960
No paging occasion
System Frame961
No paging occasion
System Frame962
No paging occasion
System Frame963
No paging occasion
System Frame964
No paging occasion
System Frame965
No paging occasion
System Frame966
No paging occasion
System Frame967
No paging occasion
System Frame968
No paging occasion
System Frame969
No paging occasion
System Frame970
No paging occasion
System Frame971
No paging occasion
System Frame972
No paging occasion
System Frame973
No paging occasion
System Frame974
No paging occasion
System Frame975
No paging occasion
System Frame976
No paging occasion
System Frame977
No paging occasion
System Frame978
No paging occasion
System Frame979
No paging occasion
System Frame980
No paging occasion
System Frame981
No paging occasion
System Frame982
No paging occasion
System Frame983
No paging occasion
System Frame984
No paging occasion
System Frame985
No paging occasion
System Frame986
No paging occasion
System Frame987
No paging occasion
System Frame988
No paging occasion
System Frame989
No paging occasion
System Frame990
No paging occasion
System Frame991
No paging occasion
0992
System Frame992
No paging occasion
System Frame993
No paging occasion
System Frame994
No paging occasion
System Frame995
No paging occasion
System Frame996
No paging occasion
System Frame997
No paging occasion
System Frame998
No paging occasion
System Frame999
No paging occasion
System Frame1000
No paging occasion
System Frame1001
No paging occasion
System Frame1002
No paging occasion
System Frame1003
No paging occasion
System Frame1004
No paging occasion
System Frame1005
No paging occasion
System Frame1006
No paging occasion
System Frame1007
No paging occasion
System Frame1008
No paging occasion
System Frame1009
No paging occasion
System Frame1010
No paging occasion
System Frame1011
No paging occasion
System Frame1012
No paging occasion
System Frame1013
No paging occasion
System Frame1014
No paging occasion
System Frame1015
No paging occasion
System Frame1016
No paging occasion
System Frame1017
No paging occasion
System Frame1018
No paging occasion
System Frame1019
No paging occasion
System Frame1020
No paging occasion
System Frame1021
No paging occasion
System Frame1022
No paging occasion
System Frame1023
No paging occasion

Calculation forecast (next 50)

SFN sequences for radio monitoring
IndexSystem Frame (SFN)Subframe / SlotPO mappingRelative latency
#10
SF: 0Slot: 0
PO index 0+0.00s
#2128
SF: 0Slot: 0
PO index 0+1.28s
#3256
SF: 0Slot: 0
PO index 0+2.56s
#4384
SF: 0Slot: 0
PO index 0+3.84s
#5512
SF: 0Slot: 0
PO index 0+5.12s
#6640
SF: 0Slot: 0
PO index 0+6.40s
#7768
SF: 0Slot: 0
PO index 0+7.68s
#8896
SF: 0Slot: 0
PO index 0+8.96s
#90
SF: 0Slot: 0
PO index 0+10.24s
#10128
SF: 0Slot: 0
PO index 0+11.52s
#11256
SF: 0Slot: 0
PO index 0+12.80s
#12384
SF: 0Slot: 0
PO index 0+14.08s
#13512
SF: 0Slot: 0
PO index 0+15.36s
#14640
SF: 0Slot: 0
PO index 0+16.64s
#15768
SF: 0Slot: 0
PO index 0+17.92s
#16896
SF: 0Slot: 0
PO index 0+19.20s
#170
SF: 0Slot: 0
PO index 0+20.48s
#18128
SF: 0Slot: 0
PO index 0+21.76s
#19256
SF: 0Slot: 0
PO index 0+23.04s
#20384
SF: 0Slot: 0
PO index 0+24.32s
#21512
SF: 0Slot: 0
PO index 0+25.60s
#22640
SF: 0Slot: 0
PO index 0+26.88s
#23768
SF: 0Slot: 0
PO index 0+28.16s
#24896
SF: 0Slot: 0
PO index 0+29.44s
#250
SF: 0Slot: 0
PO index 0+30.72s
#26128
SF: 0Slot: 0
PO index 0+32.00s
#27256
SF: 0Slot: 0
PO index 0+33.28s
#28384
SF: 0Slot: 0
PO index 0+34.56s
#29512
SF: 0Slot: 0
PO index 0+35.84s
#30640
SF: 0Slot: 0
PO index 0+37.12s
#31768
SF: 0Slot: 0
PO index 0+38.40s
#32896
SF: 0Slot: 0
PO index 0+39.68s
#330
SF: 0Slot: 0
PO index 0+40.96s
#34128
SF: 0Slot: 0
PO index 0+42.24s
#35256
SF: 0Slot: 0
PO index 0+43.52s
#36384
SF: 0Slot: 0
PO index 0+44.80s
#37512
SF: 0Slot: 0
PO index 0+46.08s
#38640
SF: 0Slot: 0
PO index 0+47.36s
#39768
SF: 0Slot: 0
PO index 0+48.64s
#40896
SF: 0Slot: 0
PO index 0+49.92s
#410
SF: 0Slot: 0
PO index 0+51.20s
#42128
SF: 0Slot: 0
PO index 0+52.48s
#43256
SF: 0Slot: 0
PO index 0+53.76s
#44384
SF: 0Slot: 0
PO index 0+55.04s
#45512
SF: 0Slot: 0
PO index 0+56.32s
#46640
SF: 0Slot: 0
PO index 0+57.60s
#47768
SF: 0Slot: 0
PO index 0+58.88s
#48896
SF: 0Slot: 0
PO index 0+60.16s
#490
SF: 0Slot: 0
PO index 0+61.44s
#50128
SF: 0Slot: 0
PO index 0+62.72s

Technical reference: Paging Occasions (PO)

Deep-dive into 3GPP TS 38.304 standards

UE identity (UE_ID)

The UE_ID is the core identifier used to distribute paging across the time domain. For IMSI identity, it is derived as IMSI mod 1024. In 5G networks, the 5G-S-TMSI is typically used once the UE is registered. If the 5G-S-TMSI is configured, the UE_ID is calculated from the bitwise representation of the TMSI (specifically bits 0-9).

"The network uses UE_ID to ensure that millions of devices do not wake up at the exact same SFN, preventing PDCCH congestion."

PF vs. PO algorithms

A Paging Frame (PF) is one radio frame which may contain one or multiple paging occasions. A Paging Occasion (PO) is a set of PDCCH monitoring occasions where the paging DCI (DCI 1_0 with P-RNTI) can be sent.

N

Number of total paging frames in a DRX cycle (T).

Ns

Number of paging occasions for a single PF.

Rel-19 PEI support

Paging Early Indication (PEI) is a Rel-17+ enhancement that allows a UE to receive a "wake-up" indication before its actual PO. If no UE in the group is being paged, the UE does not monitor the PO, resulting in massive power savings (up to 40% reduction in idle mode consumption).

40%Power save
Rel-19Latest spec

Standardization tracker

TS 38.304User Equipment (UE) procedures in idle mode
TS 38.213Physical layer procedures for control (PEI mapping)
TS 23.501System architecture for the 5G System

Design implementation note

This calculator assumes a standard paging configuration. In live networks, the actual slot offset is controlled by the RRC parameter firstPDCCH-MonitoringOccasionOfPO within DownlinkConfigCommonSIB. For FR2 mmWave deployments, multiple beams can results in multiple sub-occasions within a single PO.

5G NRRelease 19Idle mode