GPRS GPRS GPRS SCENARIO GPRS Rohde & Schwarz - GPRS 2002 / Wu Dan / 1

Transcription

1 GPRS GPRS GPRS SCENARIO GPRS Rohde & Schwarz - GPRS 2002 / Wu Dan / 1

2 GPRS R&S / Wu Dan / 2

3 1 2 GSM 3 Rohde & Schwarz - GPRS 2002 / Wu Dan / 3

4 1 2 GPRS Rohde & Schwarz - GPRS 2002 / Wu Dan / 4

5 «A» HLR (*) TC MSC/VLR CS backbone network G-MSC Public Circuit Switched Network BTS BSC «Gb» (*) the P-HLR can be included in the HLR GPRS Backbone Network GPRS PCU SGSN transport GGSN network PDN 1 PDN 2 P-HLR Rohde & Schwarz - GPRS 2002 / Wu Dan / 5

6 MSC/ VLR Gs Gr HLR Gc BSS SGSN GGSN PDN Gb Gn Gi Gp Gf SGSN other PLMN SGSN Rohde & Schwarz - GPRS 2002 / Wu Dan / 6

7 GPRS - Class - - A,B,C - Modem - wap) PC MODEM Rohde & Schwarz - GPRS 2002 / Wu Dan / 7

8 GPRS MMS Rohde & Schwarz - GPRS 2002 / Wu Dan / 8

9 GPRS R&S / Wu Dan / 9

10 Um SNDCP LLC RLC MAC RF SNDCP LLC RLC MAC RF MS Um Rohde & Schwarz - GPRS 2002 / Wu Dan / 10

11 Um TDMA T S 1 TDMA frame = 8 TS (4.615 ms) 1 radio burst (0.577 ms) multiframe = 52 TDMA frames (240 ms) 1 One PDCH B0 B1 B2 X B3 B4 B5 X B6 B7 B8 X B9 B10 B11 X block = 4 consecutive bursts Rohde & Schwarz - GPRS 2002 / Wu Dan / 11

12 Um MAC RLC RLC BCS RLC MAC RLC/MAC BCS RLC/MAC Rohde & Schwarz - GPRS 2002 / Wu Dan / 12

13 Um CS-1, CS-2, CS-3 CS-4 USF BCS USF BCS 456 bits (4 bursts) 456 bits (4 bursts) CS-1 CS-2 CS-3 CS (kbit/s) Rohde & Schwarz - GPRS 2002 / Wu Dan / 13

14 Um - PCCCH (Packet Common Control Channel) - PBCCH (Packet Broadcast Control Channel) - PTCH (Packet Traffic Channel) - PTCCH (Packet Timing Advance Control Channel) Rohde & Schwarz - GPRS 2002 / Wu Dan / 14

15 Um BCCH SI13 PDCH #i PCCCH PDCH #j PCCCH DL PDCH #I ( PBCCH), maximum = 1 UL PDCH #j DL/UL PBCCH blocks: Blocks : - PAGCH - PDTCH - PACCH : - PPCH - PAGCH - PDTCH - PACCH B0 B6 B3 B9 B1 B7 B4 B10 B2 B8 B5 B PRACH : - PRACH - PDTCH - PACCH 3 Blocks : - PDTCH - PACCH Rohde & Schwarz - GPRS 2002 / Wu Dan / 15

16 Um PBCCH PSI2 PDCH #k PCCCH PDCH #k ( PBCCH) DL UL Blocks : - PAGCH - PDTCH - PACCH : - PPCH - PAGCH - PDTCH - PACCH B0 B6 B3 B9 B1 B7 B4 B10 B2 B8 B5 B11 (2) PRACH : - PRACH - PDTCH - PACCH (3) Rohde & Schwarz - GPRS 2002 / Wu Dan / 16

17 Um SNDCP LLC RLC MAC RF SNDCP LLC RLC MAC RF MS Um Rohde & Schwarz - GPRS 2002 / Wu Dan / 17

18 Um SNDCP LLC RLC MAC RF SNDCP LLC RLC MAC RF MS Um Rohde & Schwarz - GPRS 2002 / Wu Dan / 18

19 BSS Gb SGSN Rohde & Schwarz - GPRS 2002 / Wu Dan / 19

20 B S C site G b S G S N site C C U C C U B T S P C U C C U C C U B T S P C U C C U C C U B T S P C U A b is G b c irc u it-s w itc hing function (16or6 4) kb it/s ) pac ket-s w itc h in g fu nc tion Rohde & Schwarz - GPRS 2002 / Wu Dan / 20

21 GPRS SCENARIO R&S / Wu Dan / 21

22 GPRS SCENARIO TBF (Temporary Block Flow) Management UL TBF DL TBF PDCH1 PDCH2 PDCH4 PDCH PDCH3 MS1 MS2 MS3 MS4 MS downlink flow uplink flow Rohde & Schwarz - GPRS 2002 / Wu Dan / 22

23 GPRS SCENARIO MASTER) - GSM GPRS - GPRS - PCH/PPCH) - PACCH) Rohde & Schwarz - GPRS 2002 / Wu Dan / 23

24 GPRS SCENARIO LA RA RA Gs MSC RA PPCH PACCH CS PS BTS BSS SGSN Rohde & Schwarz - GPRS 2002 / Wu Dan / 24

25 GPRS SCENARIO MSC MSC CS CS PCH PCH BTS PACCH BSS PS SGSN BTS PACCH PPCH BSS PS SGSN Rohde & Schwarz - GPRS 2002 / Wu Dan / 25

26 GPRS SCENARIO GPRS /GPRS MS MM Context State = Idle SGSN MM Context State = Idle GGSN GPRS Attach GPRS Detach MM Context State = Ready Loc = cell MM Context State = Ready Loc = cell Logical Link Rohde & Schwarz - GPRS 2002 / Wu Dan / 26

27 GPRS SCENARIO PDP / MS SGSN GGSN MM Context State = Ready/Standby Loc = cell PDP Context State = Inactive MM Context ^ State = Ready/Standby Loc = cell or RA PDP Context State = Inactive Logical Link PDP Context Activation PDP Context Deactivation MM Context State = Ready/Standby Loc = cell PDP Context State = Active MM Context State = Ready/Standby Loc = cell or RA PDP Context State = Active PDP Context State = Active SNDCP Tunnel GTP Tunnel Rohde & Schwarz - GPRS 2002 / Wu Dan / 27

28 GPRS SCENARIO IDLE GPRS Attach GPRS Detach READY Ready Timer expiry (default value = 44 s) PDU transmision STANDBY Rohde & Schwarz - GPRS 2002 / Wu Dan / 28

29 GPRS SCENARIO MS BSS SGSN PPCH or PCH Packet Paging Request (2) Packet Channel Request (3) Packet UL Assignment (4) PAGING-PS UL TBF establishment Stand-by (1) LLC PDU (5) UL-UNITDATA Packet DL Assignment (7) DL-UNITDATA (6) Ready DL TBF establishment Rohde & Schwarz - GPRS 2002 / Wu Dan / 29

30 GPRS SCENARIO MS BSS SGSN PRACH or RACH Packet Channel Request (1) Packet UL Assignment (2) UL TBF establishment Stand-by RLC PDU (3) RLC PDU Packet UL ACK/NACK (4).. UL-UNITDATA (5) RLC PDU RLC PDU Ready Packet UL ACK/NACK (6) UL-UNITDATA UL TBF release Rohde & Schwarz - GPRS 2002 / Wu Dan / 30

31 GPRS R&S / Wu Dan / 31

32 GPRS - - RLC - RLC - Rohde & Schwarz - GPRS 2002 / Wu Dan / 32

33 GPRS A PRBS ETSI Test mode A application... LLC RLC/MAC physical layer application... LLC RLC/MAC physical layer Rohde & Schwarz - GPRS 2002 / Wu Dan / 33

34 GPRS B ETSI Test mode B application... LLC RLC/MAC physical layer application... LLC RLC/MAC physical layer Rohde & Schwarz - GPRS 2002 / Wu Dan / 34

35 B BIT Analysis BIT Generation GPRS channel decoder GPRS channel coder De modulator TBF for BER Loop b-mode Decoder Modulator GPRS Coder Modulator Demodulator RLC/MAC Layer... Application Layer Ack/ Nack Rohde & Schwarz - GPRS 2002 / Wu Dan / 35

36 BLER ACK NACK / Block Error Rate BLER BLER mode Ack/Nack application... LLC RLC/MAC physical layer application... LLC RLC/MAC physical layer Rohde & Schwarz - GPRS 2002 / Wu Dan / 36

37 Tx: (GSM900) Power Control Level (PCL) Reference Level Power Class 1 Power Class 2 Power Class 3 Power Class 4 Power Class dbm ± 2 db ± 2 db 3 37 dbm ± 2 db 4 35 dbm 5 33 dbm ± 2 db 6 31 dbm 7 29 dbm ± 2 db 8 27 dbm 9 25 dbm dbm dbm dbm dbm dbm dbm dbm ± 5 db ± 5 db ± 5 db ± 5 db ± 5 db 17 9 dbm ± 5 db ± 5 db ± 5 db ± 5 db ± 5 db 18 7 dbm ± 5 db ± 5 db ± 5 db ± 5 db ± 5 db dbm ± 5 db ± 5 db ± 5 db ± 5 db ± 5 db Rohde & Schwarz - GPRS 2002 / Wu Dan / 37

38 Tx: GPRS) P CH = min(γ 0 Γ CH α * (C+48), PMAX) Γ 0 = 39dBm for GSM 900/400/850 Γ 0 = 36dBm for GSM 1800/1900 Γ CH = MS specific parameter, send in RCL control message, valid per Timeslot, 5bit value, step of 2dB from 0 to 62dB α = system parameter on System Information, 4 bit value, from 0.0 to 1.0 in 10 steps. PMAX = maximum allow power in that cell. C = received signal level at MS(=RxLev) PCH is employed on each individual PDCH! Rohde & Schwarz - GPRS 2002 / Wu Dan / 38

39 Tx: GPRS) Rohde & Schwarz - GPRS 2002 / Wu Dan / 39

40 Tx: GPRS) TS2 TS3 TS4 TS5 x y Rohde & Schwarz - GPRS 2002 / Wu Dan / 40

41 Tx: GPRS) Rohde & Schwarz - GPRS 2002 / Wu Dan / 41

42 Tx: GPRS) Rohde & Schwarz - GPRS 2002 / Wu Dan / 42

43 Tx: Rohde & Schwarz - GPRS 2002 / Wu Dan / 43

44 Tx: Rohde & Schwarz - GPRS 2002 / Wu Dan / 44

45 Tx: Rohde & Schwarz - GPRS 2002 / Wu Dan / 45

46 Rx: DUT BLER loop via RLC/MAC Modulator RAW BER Loop Channel Coder Loop Back after channel coding RLC/MAC Layer Demodulator Channel Decoder Burst by burst Block by block Rohde & Schwarz - GPRS 2002 / Wu Dan / 46

47 Rx BER,DBLER Rohde & Schwarz - GPRS 2002 / Wu Dan / 47

48 Rx USF-BLER,Negative USF-BLER Rohde & Schwarz - GPRS 2002 / Wu Dan / 48

49 BLER BIT Analysis BIT Generation GPRS channel decoder GPRS channel coder De modulator TBF for BER Loop b-mode BLER Loop Decoder Modulator GPRS Coder Modulator Demodulator RLC/MAC Layer... Application Layer Ack/ Nack Rohde & Schwarz - GPRS 2002 / Wu Dan / 49

50 BLER Radiocom Tester Pay load Real network simulation TBF DL Block Block 71 4 Block 41 Block Block 82 5 Block 52 Block Block 93 6 Block 63 Block 1 Block 2 Block 3 Mobile UL ACK / NACK Rohde & Schwarz - GPRS 2002 / Wu Dan / 50

51 BLER Radiocom Tester Real network simulation TBF DL Block10 Block 5 Dummy Mobile Repeat block 5 and 10 UL ACK / NACK Rohde & Schwarz - GPRS 2002 / Wu Dan / 51

52 BLER Radiocom Tester New Pay load Block13 Block16 Block19 Block22 Block14 Block17 Block20 Block23 Block15 Block18 Block21 Block24 Real network simulation TBF DL Block13 Block19 Block16 Block14 Block20 Block17 Block15 Block21 Block18 Block13 Block16 Block14 Block17 Block15 Block18 Block13 Block14 Block15 Mobile UL ACK / NACK Rohde & Schwarz - GPRS 2002 / Wu Dan / 52

53 Rohde & Schwarz - GPRS 2002 / Wu Dan / 53