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Wcdma physical layer
- 1. WCDMA Physical Layer Design A. Chockalingam Assistant Professor Indian Institute of Science, Bangalore-12 [email_address] http://ece.iisc.ernet.in/~achockal
- 3. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore 2G to 3G Evolution IS-95A IS-95B cdma2000 IMT2000 IMT2000: ITU’s Standardization Effort towards 3G (IMT-2000 previously termed as FPLMTS) UMTS: European Effort (Specified by 3G Partnership Project 3GPP) GSM GPRS WCDMA EDGE D A T A I S 9 9
- 4. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore UMTS NW Model USIM Mobile Equipment Access Network Serving Network PS/CS Transit Network Cu Uu Iu Yu User Equipment Access Network Core Network Infrastructure Home Network Access Stratum (Protocols between UE and Access NW) Non-access Stratum (Protocols between UE and Core NW) Zu Stratum: Refers to a way of grouping protocols handling activities
- 5. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore UMTS NW Architecture Node B UE UE UE Node B Node B Node B RNC RNC UTRAN RNS RNS CN CN (CS Domain) CN (PS Domain) SGSN GGSN Registers HLR/AuC/EIR (Home Network) 3G MSC / VLR 3G GMSC Uu Iu Iur Iub
- 8. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Radio Interface Protocol Model PHY MAC RLC Transport Channels Logical Channels User Plane Radio Bearers Signalling Radio Bearers PDCP BMC RRC USER PLANE CONTROL PLANE Control L1 (Radio Physical Layer) L2 (Radio Link Layer) L3 (Radio Network Layer) U-Plane Radio Bearers
- 14. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore I, Q Spreading for DPDCH, DPCCH DPDCH-1 DPDCH-3 C d,1 C d,3 B d B d I DPDCH-2 DPCCH-2 C d,2 C c B c B d Q I+jQ S dpch,n C c, C d,n: Channelization codes Sdpch,n: Scrambling code B d, B c: Gain factors Up to 6 DPDCHs in parallel j
- 21. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Random Access UE BS PRACH: Preamble sent (initial access) No detection on AICH PRACH: Preamble sent (initial access) AICH: Preamble sent detected PRACH: Random Access Info sent
- 26. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Transport Formats / Configurations TTI TTI TTI TTI TTI TTI TB DCH1 DCH2 TB TB TB TB TB TB Transport Block Set (TBS) TB TB Transport Format (TF) Transport Format Set (TFS) Transport Format Combination (TFC) Transport Format Combination Set (TFCS)
- 27. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore TFI and TFCI (Transmitter) Transport Chl 1 Transport Chl 2 Transport Block Transport Block Transport Block Transport Block TFI TFI TFCI Coding and Multiplexing Physical Layer Higher Layer DPCCH (Q-Chl) DPDCH (I-Chl) Physical Control Chl Physical Data Chl E.g: Two transport channels mapped to a single physical channel This dotted line represents the Iur interface in case of NW side
- 28. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore TFI and TFCI (Receiver) Transport Chl 1 Transport Chl 2 Transport Block & EI Transport Block & EI Transport Block & EI Transport Block & EI TFI TFI TFCI Decode Decoding and Demultiplexing Physical Layer Higher Layer DPCCH (Q-Chl) DPDCH (I-Chl) EI: Error Indication Physical Control Chl Physical Data Chl
- 34. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Multiplexing & Channel Coding (U/L) CRC Attachment TrBk Concatenation/ Code Block Segmentation Channel Coding Radio Frame Equalization 1st Interleaving Radio Frame Segmentation Rate Matching CCTrCH CRC Attachment TrBk Concatenation/ Code Block Segmentation Channel Coding Radio Frame Equalization 1st Interleaving Radio Frame Segmentation Rate Matching TrCH-2 TrCH Multiplexing Physical Channel Segmentation 2nd interleaving TrCH-1 Physical Channel Mapping PhCH#2 PhCH#1
- 52. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore D/L Spreading DL Physical Channel data C d,SF,m Serial to Parallel Conv. I Q I+jQ S dl,n j Channelisation code: - Differentiate users in a cell - OVSF - UTRAN assigns channelisation codes to diff. phy. chls Scrambling Code: Differentiate cells
- 54. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Multiplexing & Channel Coding (D/L) CRC Attachment TrBk Concatenation/ Code Block Segmentation Channel Coding Rate Matching 1st Insertion of DTX Indication 1st Interleaving Radio Frame Segmentation CCTrCH CRC Attachment TrBk Concatenation/ Code Block Segmentation Channel Coding Rate Matching 1st Insertion of DTX Indication 1st Interleaving Radio Frame Segmentation TrCH-2 TrCH Multiplexing Physical Channel Segmentation 2nd interleaving TrCH-1 Physical Channel Mapping PhCH#2 PhCH#1 2nd Insertion of DTX Indication
- 57. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore WCDMA Physical Channels P-CCPCH S-CCPCH DPDCH DPCCH PDSCH PCPCH PRACH BS UE AICH P-SCH S-SCH CSICH CPICH PICH CD/CA-ICH
- 58. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Channel Mapping on the U/L CCCH DTCH DCCH RACH DCH CPCH PRACH DPDCH DPCCH PCPCH Logical Channels Transport Channels Physical Channels
- 59. Dr. A. Chockalingam Dept of ECE, IISc, Bangalore Channel Mapping on the D/L BCCH PCCH CTCH CCCH DCCH DTCH BCH PCH FACH DCH DSCH P-CCPCH S-CCPCH DPDCH DPCCH PDSCH Logical Channels Transport Channels Physical Channels