Telecom Tutorials by Samir Amberkar

Below is an example of LTE DL PHY structure for 6 RB/FDD configuration. You would find an example of 15 RB configuration in next article. I wrote a small Perl script to take few configuration parameters and generate below diagram. You may contact me at samir.s.amberkar@gmail.com if you would like to try the script.

Though the diagrams are generated with PHY equations available in 3GPP TS 36.211, Paul Wad's site helped me verify my calculations !!

Legend D PDCCH (Downlink Control) F PCFICH (Control Format Indicator) H PHICH (HARQ Indicator) B PBCH (Broadcast) b Not used due to broadcast signals P PSS (Primary Syhchronisation Signal) S SSS (Secondary Syhchronisation Signal) p Not used due to PSS s Not used due to SSS R Cell Reference Signal r Not used due to Reference signals Available for PDSCH

Configuration: DL Channel Bandwidh = 1.4 MHz (i.e. n6 as per MIB i.e NRB=6 resource blocks) Normal Cyclic Prefix One antenna port (p=0) Number of control symbols (L) = 2 Cell ID = 6 Ng = 1, so number of PHICH groups = 1 References from 3GPP TS 36.211, v8.9.0 PDCCH - section 6.8.5 PCFICH - section 6.7.4 PHICH - section 6.9.3 PBCH (MIB) - section 6.6.4 Not used due to broadcast - The mapping operation shall assume cell-specific reference signals for antenna ports 0-3 being present irrespective of the actual configuration. The UE shall assume that the resource elements assumed to be reserved for reference signals in the mapping operation above but not used for transmission of reference signal are not available for PDSCH transmission. PSS - section 6.11.1.2 SSS - section 6.11.2.2 Cell reference signals - section 6.10.1.2 Not used due to cell reference signals, section 6.2.4 - In case a single cell-specific reference signal is configured, cell-specific reference signals shall be assumed to be present on antenna ports 0 and 1 for the purpose of mapping a symbol-quadruplet to a resource-element group, otherwise the number of cell-specific reference signals shall be assumed equal to the actual number of antenna ports used for cell-specific reference signals.

- 5 - - - - - - - - - - - - 4 - - - - - - - - - - - - 3 - - - - - - - - - - - - 2 - - - - - - - - - - - - 1 - - - - - - - - - - - - 0 - - - - - - - - - - -

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 D D       s p B B B B       D D                         D D                         D D                         D D                         D D       s p               D D                         D D                         D D                         D D                         D D s p B B B B D D D D D D D D D D s p D D D D D D D D r D R s p r b B B R r D R r R r D R r R r D R r R r D R r R r D R s p r R r D R r R r D R r R r D R r R r D R r R D D s p B B B B D D D D D D D D D D s p D D D D D D D D D D s p B B B B D D D D D D D D D D s p D D D D D D D D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D S P B B B B F D F D F D F D F D S P F D F D F D F D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R D D S P B B B B D D D D D D D D D D S P D D D D D D D D D D S P B B B B D D D D D D D D D D S P D D D D D D D D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D r D R S P r b B B R r D R r R r D R r R r D R r R r D R r R r D R S P r R r D R r R r D R r R r D R r R r D R r R H D S P B B B B H D H D H D H D H D S P H D H D H D H D H D S P B B B B H D H D H D H D H D S P H D H D H D H D R D r S P R B B B r R D r R r R D r R r R D r R r R D r R r R D r S P R r R D r R r R D r R r R D r R r R D r R r F D S P B B B B F D F D F D F D F D S P F D F D F D F D F D s p B B B B F D F D F D F D F D s p F D F D F D F D r D R s p r b B B R r D R r R r D R r R r D R r R r D R r R r D R s p r R r D R r R r D R r R r D R r R r D R r R F D s p B B B B F D F D F D F D F D s p F D F D F D F D F D s p B B B B F D F D F D F D F D s p F D F D F D F D R D r s p R B B B r R D r R r R D r R r R D r R r R D r R r R D r s p R r R D r R r R D r R r R D r R r R D r R r

Copyright © Samir Amberkar 2010-12

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