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Reference Signal for LTE-Advanced

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Reference Signal for LTE-Advanced

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Reference Signal for LTE-Advanced Arumjeni Mitayani
Prologue
Reference Signal • Downlink – Cell-specific reference signals – MBSFN reference signals – UE-specific reference signal (evo) – Positioning reference signal – CSI reference signal (evo) • Uplink – Generation of the reference signal sequence – Demodulation reference signal (evo) – Sounding reference signal (evo)
Cell-specific RS • Rel. 8 – Non-MBSFN transmission • Rel. 9 – PDSCH transmission • Rel.10 – PDSCH transmission
Cell-specific RS (2) 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l OneantennaportTwoantennaports Resource element (k,l) Not used for transmission on this antenna port Reference symbols on this antenna port 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l 0l 1R 1R 1R 1R 6l 0l 1R 1R 1R 1R 6l 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l 0l 1R 1R 1R 1R 6l 0l 1R 1R 1R 1R 6l Fourantennaports 0l 6l 0l 2R 6l 0l 6l 0l 6l 2R 2R 2R 3R 3R 3R 3R even-numbered slots odd-numbered slots Antenna port 0 even-numbered slots odd-numbered slots Antenna port 1 even-numbered slots odd-numbered slots Antenna port 2 even-numbered slots odd-numbered slots Antenna port 3
Cell-specific RS (3) • Generation 12,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - N cell ID - N CP - n s Output: - CRS (3 dimension)
Cell-specific RS (4) • Mapping )'(s, )( , mra nl p lk DL RB DLmax, RB DL RB DL symb shift 12,...,1,0 3,2if1 1,0if3,0 6mod6 NNmm Nm p pN l vvmk Input: - N max DL RB - N DL RB - N cell ID - n s - CRS 3if)2mod(33 2if)2mod(3 0and1if0 0and1if3 0and0if3 0and0if0 s s pn pn lp lp lp lp v 6modcell IDshift Nv Output: - Slot (3 dimension)
MBSFN-RS • Only supported in extended cyclic prefix mode 0l 5l 0l 5l even-numbered slots odd-numbered slots Antenna port 4 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R Using antenna port 4
MBSFN-RS (2) • Generation 16,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl MBSFN ID MBSFN ID 9 init 121172 NNlnc s Input: - N max DL RB - N MBSFN ID - n s Output: - MBSFNRS (3 dimension)
MBSFN-RS (3) • Mapping )(s, )( , mra nl p lk DL RB DLmax, RB DL RB s s s s 3 16,...,1,0 kHz5.7and12modif2,0 kHz5.7and02modif1 kHz15and12modif4,0 kHz15and02modif2 kHz5.7and0if24 kHz5.7and0if4 kHz15and0if12 kHz15and0if2 NNmm Nm fn fn fn fn l flm flm flm flm k Input: - n s - N max DL RB - N DL RB - MBSFNRS Output: - Slot (3 dimension)
UE-specific RS • Purpose – Enable channel estimation for demodulation – Allows reduced RS overhead – Obtain more accurate interference estimates in partial loading scenarios • 1 • 2 • 3
UE-specific RS (2) 0l even-numbered slots odd-numbered slots Antenna port 5 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 0l 6l6l
UE-specific RS (3) 0l 6l 0l 6l Specialsubframe,configuration1,2,6or7Specialsubframe,configuration3,4or8 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l Allotherdownlinksubframes 0l 6l 0l 6l 0l 6l 0l 6l even-numbered slots odd-numbered slots Antenna port 7 even-numbered slots odd-numbered slots Antenna port 8 even-numbered slots odd-numbered slots Antenna port 9 even-numbered slots odd-numbered slots Antenna port 10 7R 7R 7R 7R 7R7R7R7R 7R 7R 7R 7R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 7R 7R 7R7R 7R 7R 7R 7R 7R7R 7R 7R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 7R 7R 7R7R 7R 7R 7R 7R 7R7R 7R 7R 8R 8R 8R 8R 8R 8R 0l 6l 0l 6l 8R 8R 8R 8R 8R 8R 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R
UE-specific RS (4) • Generation 11210,)12(21 2 1 )2(21 2 1 )( PDSCH RBs N,...,,mmcjmcmrn RNTI 16cell IDsinit 21212 nNnc prefixcyclicextended11610 prefixcyclicnormal11210 ,)12(21 2 1 )2(21 2 1 )( DLmax, RB DLmax, RB N,...,, N,...,, mmcjmcmr SCID 16cell IDsinit 21212/ nNnc Input: - N PDSCH RB - N cell ID - n RNTI - N max DL RB - n SCID Output: - DMRS for port 5 (2 dimension) - DMRS for others (3 dimension)
UE-specific RS (5) • Mapping )'3( PDSCH RB )( , s mNlra n p lk 13,...,1,0' 12modif2,3 02modif1,0 35 22 16 03 6,5if4mod)2(4m' 3,2if'4 mod)( PDSCH RB s s shift shift PRB RB sc RB sc Nm n n l l l l l l lv lvm k nNNkk Input: - N PDSCH RB - n s - N sc RB - n PRB - DMRS Output: - Slot (3 dimension) 3modcell IDshift Nv
UE-specific RS (6)
Positioning RS 0l 6l 0l 6l FourPBCHantennaports 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 0l 6l 0l 6l OneandtwoPBCHantenna ports 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R even- numbered slots odd- numbered slots Antenna port 6 even-numbered slots odd- numbered slots Antenna port 6
Positioning RS (2) • Generation 12,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - n s - N cell ID - N CP Output - PRS (3 dimension)
Positioning RS (2) • Mapping )'(s, )( , mra nl p lk PRS RB DLmax, RB PRS RB s s s shift PRS RB DL RB 12,,1,0 portsantennaPBCH4and12modif6,5,3,2 portsantennaPBCH2or1and12modif6,5,3,2,1 02modif6,5,3 6mod66 NNmm Nm n n n l vlNNmk  6modcell IDshift Nv Input: - N DL RB - N PRS RB - N max DL RB - N cell ID - PRS Output: - Slot (3 dimension)
CSI-RS • Purpose – To support 8-layer spatial multiplexing – Replace legacy data symbols on CSI-RS REs – Better support of coordinated multipoint (CoMP) • 1 • 2
CSI-RS (2) even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 15R 15R 16R 16R 17R 17R 18R 18R 19R 19R 20R 20R 21R 21R 22R 22R
CSI-RS (3) • Generation 1,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - N cell ID - N CP - n s Output: - CSIRS (3 dimension)
CSI-RS (4) • Mapping )'(s," )( , mrwa nll p lk 2 DL RB DLmax, RB' 1 DL RB,...,1,0 1,0" 22,20,18,16 " 1 21,19,17,151 prefixcyclicextended27,-0ionsconfiguratsignalreferenceCSI" prefixcyclicnormal31,-20ionsconfiguratsignalreferenceCSI"2 prefixcyclicnormal19,-0ionsconfiguratsignalreferenceCSI" ' prefixcyclicextended,22,21for9 prefixcyclicextended,20,19for6 prefixcyclicextended,18,17for3 prefixcyclicextended,16,15for0 prefixcyclicnormal,22,21for7 prefixcyclicnormal,20,19for1 prefixcyclicnormal,18,17for6 prefixcyclicnormal,16,15for0 12' NN mm Nm l p l p lw l l l ll p p p p p p p p mkk Input: - N DL RB - N max DL RB - P - CSI config - N CP - CSIRS Output: - Slot (3 dimension)
CSI-RS (5)
Demodulation RS • To reduce downlink signaling overhead, 3 bit field is used to signal combination of CS and OCC
Evolution • LTE Release 8 – SRS is based on the extended ZC sequence • LTE Release 10 – Aperiodic SRS (A-SRS) • 2
Sounding Reference Signal

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Reference Signal for LTE-Advanced

  • 3. Reference Signal • Downlink – Cell-specific reference signals – MBSFN reference signals – UE-specific reference signal (evo) – Positioning reference signal – CSI reference signal (evo) • Uplink – Generation of the reference signal sequence – Demodulation reference signal (evo) – Sounding reference signal (evo)
  • 4. Cell-specific RS • Rel. 8 – Non-MBSFN transmission • Rel. 9 – PDSCH transmission • Rel.10 – PDSCH transmission
  • 5. Cell-specific RS (2) 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l OneantennaportTwoantennaports Resource element (k,l) Not used for transmission on this antenna port Reference symbols on this antenna port 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l 0l 1R 1R 1R 1R 6l 0l 1R 1R 1R 1R 6l 0l 0R 0R 0R 0R 6l 0l 0R 0R 0R 0R 6l 0l 1R 1R 1R 1R 6l 0l 1R 1R 1R 1R 6l Fourantennaports 0l 6l 0l 2R 6l 0l 6l 0l 6l 2R 2R 2R 3R 3R 3R 3R even-numbered slots odd-numbered slots Antenna port 0 even-numbered slots odd-numbered slots Antenna port 1 even-numbered slots odd-numbered slots Antenna port 2 even-numbered slots odd-numbered slots Antenna port 3
  • 6. Cell-specific RS (3) • Generation 12,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - N cell ID - N CP - n s Output: - CRS (3 dimension)
  • 7. Cell-specific RS (4) • Mapping )'(s, )( , mra nl p lk DL RB DLmax, RB DL RB DL symb shift 12,...,1,0 3,2if1 1,0if3,0 6mod6 NNmm Nm p pN l vvmk Input: - N max DL RB - N DL RB - N cell ID - n s - CRS 3if)2mod(33 2if)2mod(3 0and1if0 0and1if3 0and0if3 0and0if0 s s pn pn lp lp lp lp v 6modcell IDshift Nv Output: - Slot (3 dimension)
  • 8. MBSFN-RS • Only supported in extended cyclic prefix mode 0l 5l 0l 5l even-numbered slots odd-numbered slots Antenna port 4 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R 4R Using antenna port 4
  • 9. MBSFN-RS (2) • Generation 16,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl MBSFN ID MBSFN ID 9 init 121172 NNlnc s Input: - N max DL RB - N MBSFN ID - n s Output: - MBSFNRS (3 dimension)
  • 10. MBSFN-RS (3) • Mapping )(s, )( , mra nl p lk DL RB DLmax, RB DL RB s s s s 3 16,...,1,0 kHz5.7and12modif2,0 kHz5.7and02modif1 kHz15and12modif4,0 kHz15and02modif2 kHz5.7and0if24 kHz5.7and0if4 kHz15and0if12 kHz15and0if2 NNmm Nm fn fn fn fn l flm flm flm flm k Input: - n s - N max DL RB - N DL RB - MBSFNRS Output: - Slot (3 dimension)
  • 11. UE-specific RS • Purpose – Enable channel estimation for demodulation – Allows reduced RS overhead – Obtain more accurate interference estimates in partial loading scenarios • 1 • 2 • 3
  • 12. UE-specific RS (2) 0l even-numbered slots odd-numbered slots Antenna port 5 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 5R 0l 6l6l
  • 13. UE-specific RS (3) 0l 6l 0l 6l Specialsubframe,configuration1,2,6or7Specialsubframe,configuration3,4or8 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l Allotherdownlinksubframes 0l 6l 0l 6l 0l 6l 0l 6l even-numbered slots odd-numbered slots Antenna port 7 even-numbered slots odd-numbered slots Antenna port 8 even-numbered slots odd-numbered slots Antenna port 9 even-numbered slots odd-numbered slots Antenna port 10 7R 7R 7R 7R 7R7R7R7R 7R 7R 7R 7R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 7R 7R 7R7R 7R 7R 7R 7R 7R7R 7R 7R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 8R 7R 7R 7R7R 7R 7R 7R 7R 7R7R 7R 7R 8R 8R 8R 8R 8R 8R 0l 6l 0l 6l 8R 8R 8R 8R 8R 8R 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 9R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R 10R
  • 14. UE-specific RS (4) • Generation 11210,)12(21 2 1 )2(21 2 1 )( PDSCH RBs N,...,,mmcjmcmrn RNTI 16cell IDsinit 21212 nNnc prefixcyclicextended11610 prefixcyclicnormal11210 ,)12(21 2 1 )2(21 2 1 )( DLmax, RB DLmax, RB N,...,, N,...,, mmcjmcmr SCID 16cell IDsinit 21212/ nNnc Input: - N PDSCH RB - N cell ID - n RNTI - N max DL RB - n SCID Output: - DMRS for port 5 (2 dimension) - DMRS for others (3 dimension)
  • 15. UE-specific RS (5) • Mapping )'3( PDSCH RB )( , s mNlra n p lk 13,...,1,0' 12modif2,3 02modif1,0 35 22 16 03 6,5if4mod)2(4m' 3,2if'4 mod)( PDSCH RB s s shift shift PRB RB sc RB sc Nm n n l l l l l l lv lvm k nNNkk Input: - N PDSCH RB - n s - N sc RB - n PRB - DMRS Output: - Slot (3 dimension) 3modcell IDshift Nv
  • 17. Positioning RS 0l 6l 0l 6l FourPBCHantennaports 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 0l 6l 0l 6l OneandtwoPBCHantenna ports 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R 6R even- numbered slots odd- numbered slots Antenna port 6 even-numbered slots odd- numbered slots Antenna port 6
  • 18. Positioning RS (2) • Generation 12,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - n s - N cell ID - N CP Output - PRS (3 dimension)
  • 19. Positioning RS (2) • Mapping )'(s, )( , mra nl p lk PRS RB DLmax, RB PRS RB s s s shift PRS RB DL RB 12,,1,0 portsantennaPBCH4and12modif6,5,3,2 portsantennaPBCH2or1and12modif6,5,3,2,1 02modif6,5,3 6mod66 NNmm Nm n n n l vlNNmk  6modcell IDshift Nv Input: - N DL RB - N PRS RB - N max DL RB - N cell ID - PRS Output: - Slot (3 dimension)
  • 20. CSI-RS • Purpose – To support 8-layer spatial multiplexing – Replace legacy data symbols on CSI-RS REs – Better support of coordinated multipoint (CoMP) • 1 • 2
  • 21. CSI-RS (2) even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots even-numbered slots odd-numbered slots 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 0l 6l 15R 15R 16R 16R 17R 17R 18R 18R 19R 19R 20R 20R 21R 21R 22R 22R
  • 22. CSI-RS (3) • Generation 1,...,1,0,)12(21 2 1 )2(21 2 1 )( DLmax, RB, s Nmmcjmcmr nl CP cell ID cell IDs 10 init 2121172 NNNlnc Input: - N max DL RB - N cell ID - N CP - n s Output: - CSIRS (3 dimension)
  • 23. CSI-RS (4) • Mapping )'(s," )( , mrwa nll p lk 2 DL RB DLmax, RB' 1 DL RB,...,1,0 1,0" 22,20,18,16 " 1 21,19,17,151 prefixcyclicextended27,-0ionsconfiguratsignalreferenceCSI" prefixcyclicnormal31,-20ionsconfiguratsignalreferenceCSI"2 prefixcyclicnormal19,-0ionsconfiguratsignalreferenceCSI" ' prefixcyclicextended,22,21for9 prefixcyclicextended,20,19for6 prefixcyclicextended,18,17for3 prefixcyclicextended,16,15for0 prefixcyclicnormal,22,21for7 prefixcyclicnormal,20,19for1 prefixcyclicnormal,18,17for6 prefixcyclicnormal,16,15for0 12' NN mm Nm l p l p lw l l l ll p p p p p p p p mkk Input: - N DL RB - N max DL RB - P - CSI config - N CP - CSIRS Output: - Slot (3 dimension)
  • 25. Demodulation RS • To reduce downlink signaling overhead, 3 bit field is used to signal combination of CS and OCC
  • 26. Evolution • LTE Release 8 – SRS is based on the extended ZC sequence • LTE Release 10 – Aperiodic SRS (A-SRS) • 2