LTE System Overview - additional materials

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Here are some additional materials from LTE System Overview course delivered in January 2013 in Amsterdam, The Netherlands.
To learn more about our LTE/LTE-Advanced course portfolio, please follow the link: http://is-wirelesstraining.com/trainings

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LTE System Overview - additional materials

  1. 1. LTE System Overview Additional Materials
  2. 2. OFDMA Processing Chain (From Bits to Carrier Frequency) X1 x1 X2 x2 X3 x3 xN … x4 x3 x2 x1 101010011101….. X1 X2 X3 X4 … XN Modulator S/P IFFT P/S QPSK/16QAM/64QAM X4 x4 Q … … t I XN xN t t t t Upconverter CP D/A (Local Oscillator) xN … x4 x3 x2 x1 xN xN-1 0MHz fc f 0MHz f fc BW BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  3. 3. E-UTRAN and EPC Protocol Stacks Control Plane Control Plane NAS NAS GTP-C GTP-C RRC RRC S1-AP S1-AP PDCP PDCP SCTP SCTP UDP UDP RLC RLC IP IP IP IP MAC MAC L2 L2 L2 L2 PHY PHY PHY PHY PHY PHY Uu S1-MME S11 MME SGW eNBCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  4. 4. E-UTRAN and EPC Protocol Stacks User Plane User Plane Application IP IP PDCP PDCP GTP-U GTP-U GTP-U GTP-U RLC UDP/IP UDP/IP UDP/IP UDP/IP RLC MAC MAC L2 L2 L2 L2 PHY PHY PHY PHY PHY PHY S1-U S5 Uu SGW PGW eNBCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  5. 5. E-UTRA QoS Target PHY Bitrates Number of necessary PRB allocated in the frame for target bitrates (assumed 2 symbols for Control region and single antenna case) MCS Target PHY Target PHY Bitrate [kbps] bits/frame 64QAM 64QAM QPSK 1/2 QPSK 4/5 16QAM 1/2 16QAM 4/5 1/2 4/5 64 656 10 6 6 4 4 2 128 1311 20 12 10 6 8 4 256 2622 38 24 20 12 14 8 512 5243 76 48 38 24 26 16 1024 10486 152 96 76 48 52 32 E.g.: We need 48 PRB in the frame allocated to assure 1Mbit/s with 16QAM and coding rate of 4/5Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  6. 6. E-UTRA QoS Necessary Bitrates for the Example Services We can omit the whole TCP, RTP, UDP, Allocation requirements for example services IP headers’ influence, thanks to RoHC Real Time Video HTTP/ VoIP Service Type Gaming Streaming Email User data size (single packet) – UserSize 32 32 188 1500 bytes PDCP Header (RoHC) 6 bytes Source: Radio Network Planning and Optimisation for UMTS, Laiho J. RLC Header 2 bytes Overhead MAC Header 6 bytes PHY (CRC) 3 bytes Overall overhead – OHsize 17 bytes Required rate at application (user data) – 12.2 30 128 128 kbit/s UserRate OHsize/UserSize Necessary overhead rate - OHrate 6.6 16.3 11.8 1.5 kbit/s *UserRate OHrate/PHYrate Data rate % used to cary overhead 35% 35% 8% 1% kbit/s *100% Required rate at PHY input (per second) – OHrate+ 19.1 47 142.9 132.5 kbit/s UserRate PHYrate PHYrate*1024 Required rate at PHY input (per 10ms - frame) – 191 471 1430 1326 bit/frame [bits/kb]/100 PHYframeRate [frames/s] Number of necesary PRB in the frame 2 4 12 10 PRB/frame (for example MCS: 16QAM 1/2) We need 2 PRB per radio frame to assure required VoIP bit rate (typically we assign 4 PRB every second frame)Copyright by IS-Wireless. All rights reserved. www.is-wireless.com

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