Method and apparatus for NR-DMRS sequence design

Abstract

A method of a user equipment (UE) for controlling reference signal in a wireless communication system is provided. The method comprises receiving, from a base station (BS), a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH) over a downlink channel and determining resources to be used for the DMRS of the PBCH. A pseudo-noise (PN) sequence that is mapped to the resources to be used for the DMRS of the PBCH is generated by a base station (BS). The PN sequence is generated based on an initial condition including a physical cell identification (ID) and timing information comprising at least one of an index of synchronization signal block (SSB) or an index of a half frame within a frame based on a carrier frequency range. The index of SSB comprises at least one of a partial or whole index of SSB.

What is claimed is: 
     
       1. A user equipment (UE) for controlling reference signal in a wireless communication system, the UE comprising:
 a transceiver configured to receive, from a base station (BS), a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH) over a downlink channel; and 
 a processor operably connected to the transceiver, the processor configured to determine resources to be used for the DMRS of the PBCH, wherein a pseudo-noise (PN) sequence that is mapped to the resources to be used for the DMRS of the PBCH is generated by a base station (BS), and 
 wherein the PN sequence is generated based on an initial condition c_B given
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
 
 
 
       where I_ID is a physical cell identification (ID) and I_t is timing information included in a DMRS sequence. 
     
     
       2. The UE of  claim 1 , wherein the processor is further configured to determine one DMRS sequence from eight candidate DMRS sequences for a cell according to one of carrier frequency ranges comprising a carrier frequency range A, a carrier frequency range B, and a carrier frequency range C, wherein the carrier frequency range A is zero to three giga-hertz (GHz), the carrier frequency range B is three to six GHz, and the carrier frequency range C is six to 52.6 GHz. 
     
     
       3. The UE of  claim 2 , wherein the eight candidate DMRS sequences are generated based on three bits of the timing information, the timing information comprising an index of a synchronization signal block (SSB) in two bits and, an index of a half frame within a frame in one bit for the carrier frequency range A, an index of the SSB in three bits for the carrier frequency range B, and part of an index of the SSB in three least significant bits (LSB) for the carrier frequency range C. 
     
     
       4. The UE of  claim 2 , wherein partial timing information for the carrier frequency range B and the carrier frequency range C is transmitted as part of a payload of the PBCH. 
     
     
       5. The UE of  claim 1 , wherein the I_t=4*I_HF+I_SSB for a carrier frequency range A and the I_t=I_SSB for a carrier frequency range B and a carrier frequency range C, wherein I_HF is the index of a half frame within a frame and I_SSB is an index of a synchronization signal block (SSB) for the carrier frequency range A and the carrier frequency range B, and is part of the index of the SSB in three least significant bits (LSB) for the carrier frequency range C. 
     
     
       6. A base station (BS) for controlling reference signal in a wireless communication system, the BS comprising:
 a processor configured to:
 determine resources to be used for a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH), 
 generate a pseudo-noise (PN) sequence based on an initial condition c_B given by:
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
 
 
 where I_ID is a physical cell identification (ID) and I_IT is timing information included in a DMRS sequence, and 
 map the PN sequence to the resources to be used for the DMRS of the PBCH; and 
 
 a transceiver operably connected to the processor, the transceiver configured to transmit, to a user equipment (UE), the DMRS of the PBCH over a downlink channel. 
 
     
     
       7. The BS of  claim 6 , wherein the processor is further configured to determine one DMRS sequence from eight candidate DMRS sequences for a cell according to one of carrier frequency ranges comprising a carrier frequency range A, a carrier frequency range B, and a carrier frequency range C, wherein the carrier frequency range A is zero to three giga-hertz (GHz), the carrier frequency range B is three to six GHz, and the carrier frequency range C is six to 52.6 GHz. 
     
     
       8. The BS of  claim 7 , wherein the eight candidate DMRS sequences are generated based on three bits of the timing information, the timing information comprising an index of a synchronization signal block (SSB) in two bits and, an index of a half frame within a frame in one bit for the carrier frequency range A, an index of the SSB in three bits for the carrier frequency range B, and part of an index of the SSB in three least significant bits (LSB) for the carrier frequency range C. 
     
     
       9. The BS of  claim 7 , wherein partial timing information for the carrier frequency range B and the carrier frequency range C is transmitted as part of a payload of the PBCH. 
     
     
       10. The BS of  claim 6 , wherein the I_t=4*I_HF+I_SSB for a carrier frequency range A and the I_t=I_SSB for a carrier frequency range B and a carrier frequency range C, wherein I_HF is the index of a half frame within a frame and I_SSB is an index of a synchronization signal block (SSB) for the carrier frequency range A and the carrier frequency range B, and is part of the index of the SSB in three least significant bits (LSB) for the carrier frequency range C. 
     
     
       11. A method of a user equipment (UE) for controlling reference signal in a wireless communication system, the method comprising:
 receiving, from a base station (BS), a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH) over a downlink channel; and 
 determining resources to be used for the DMRS of the PBCH, wherein a pseudo-noise (PN) sequence that is mapped to the resources to be used for the DMRS of the PBCH is generated by a base station (BS), and 
 wherein the PN sequence is generated based on an initial condition c_B given by:
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
 
 
 where I_ID is a physical cell identification (ID) and I_t is timing information included in a DMRS sequence. 
 
     
     
       12. The method of  claim 11 , further comprising determining one DMRS sequence from eight candidate DMRS sequences for a cell according to one of carrier frequency ranges comprising a carrier frequency range A, a carrier frequency range B, and a carrier frequency range C, wherein the carrier frequency range A is zero to three giga-hertz (GHz), the carrier frequency range B is three to six GHz, and the carrier frequency range C is six to 52.6 GHz. 
     
     
       13. The method of  claim 12 , wherein the eight candidate DMRS sequences are generated based on three bits of the timing information, the timing information comprising an index of a synchronization signal block (SSB) in two bits and, an index of a half frame within a frame in one bit for the carrier frequency range A, an index of the SSB in three bits for the carrier frequency range B, and part of an index of the SSB in three least significant bits (LSB) for the carrier frequency range C. 
     
     
       14. The method of  claim 12 , wherein partial timing information for the carrier frequency range B and the carrier frequency range C is transmitted as part of a payload of the PBCH. 
     
     
       15. A method performed by a base station in a communication system, the method comprising:
 identifying a demodulation reference signal (DMRS) sequence associated with a pseudo-noise (PN) sequence,   wherein an initial value c_B of the PN sequence is defined based on
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I ID,4),
 
   
       where I_ID is a physical cell identification (ID) and I_t is timing information defined based on at least one of a system frame number (SFN) or a synchronization signal block (SSB) index, and
 wherein the DMRS sequence is for a physical broadcast channel (PBCH); 
 identifying resources for transmitting the DMRS sequence; and 
 transmitting, to a terminal, the DMRS sequence on the resources. 
 
     
     
       16. The method of  claim 15 , wherein the DMRS sequence is identified among a plurality of candidate DMRS sequences based on a number of SSB indices. 
     
     
       17. The method of  claim 15 , wherein the timing information is defined based on two bits of the SSB index and one bit of a half frame index in case that a number of SSB indices is 4. 
     
     
       18. The method of  claim 15 , wherein the timing information is defined based on three bits of the SSB index in case that a number of the SSB indices is 8. 
     
     
       19. The method of  claim 15 , wherein the timing information is defined based on three least significant bits (LSBs) of SSB index in case that a number of the SSB indices is 64. 
     
     
       20. The method of  claim 15 ,
 wherein I_t=I_SSB in case that a number of SSB indices is 8 or 64, and   wherein I_SSB is three least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 8, and the I_SSB is three LSBs of the SSB index in case that the number of the SSB indices is 64.   
     
     
       21. The method of  claim 15 , wherein the I t=4* I HF+I SSB in case that a number of SSB indices is 4, and
 wherein I_HF is a half frame index and I_SSB is two least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 4.   
     
     
       22. The method of  claim 15 , wherein the timing information includes two bits of the SSB index and one bit of a half frame index. 
     
     
       23. A method performed by a terminal in a communication system, the method comprising:
 identifying resources for receiving a demodulation reference signal (DMRS) sequence, associated with a pseudo-noise (PN) sequence, wherein the DMRS sequence is for a physical broadcast channel (PBCH); and   receiving, from a base station, the DMRS sequence,   wherein an initial value c_B of the PN sequence is defined based on
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
 
   where I_ID is a physical cell identification (ID) and I_t is timing information defined based on at least one of a system frame number (SFN) or a synchronization signal block (SSB) index.   
     
     
       24. The method of  claim 23 , wherein the DMRS sequence is identified among a plurality of candidate DMRS sequences based on a number of SSB indices. 
     
     
       25. The method of  claim 23 , wherein the timing information is defined based on two bits of the SSB index and one bit of a half frame index in case that a number of SSB indices is 4. 
     
     
       26. The method of  claim 23 , wherein the timing information is defined based on three bits of the SSB index in case that a number of the SSB indices is 8. 
     
     
       27. The method of  claim 23 , wherein the timing information is defined based on three least significant bits (LSBs) of SSB index in case that a number of the SSB indices is 64. 
     
     
       28. The method of  claim 23 ,
 wherein I_t=I_SSB in case that a number of SSB indices is 8 or 64, and   wherein I_SSB is three least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 8, and the I_SSB is three LSBs of the SSB index in case that the number of the SSB indices is 64.   
     
     
       29. The method of  claim 23 , wherein the I_t=4*I_HF+I_SSB in case that a number of SSB indices is 4, and
 wherein I_HF is a half frame index and I_SSB is two least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 4.   
     
     
       30. The method of  claim 23 , wherein the timing information includes two bits of the SSB index and one bit of a half frame index. 
     
     
       31. A base station in a communication system, the base station comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to:
 identify a demodulation reference signal (DMRS) sequence associated with a pseudo-noise (PN) sequence, wherein an initial value c_B of the PN sequence is defined based on
   c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
 
 
   where I_ID is a physical cell identification (ID) and I_t is timing information defined based on at least one of a system frame number (SFN) or a synchronization signal block (SSB) index, and wherein the DMRS sequence is for a physical broadcast channel (PBCH),
 identify resources for transmitting the DMRS sequence, and 
 transmit, to a terminal, the DMRS sequence on the resources. 
   
     
     
       32. The base station of  claim 31 , wherein the DMRS sequence is identified among a plurality of candidate DMRS sequences based on a number of SSB indices. 
     
     
       33. The base station of  claim 31 , wherein the timing information is defined based on two bits of the SSB index and one bit of a half frame index in case that a number of SSB indices is 4. 
     
     
       34. The base station of  claim 31 , wherein the timing information is defined based on three bits of the SSB index in case that a number of the SSB indices is 8. 
     
     
       35. The base station of  claim 31 , wherein the timing information is defined based on three least significant bits (LSBs) of SSB index in case that a number of the SSB indices is 64. 
     
     
       36. The base station of  claim 31 ,
 wherein I_t=I_SSB in case that a number of SSB indices is 8 or 64, and   wherein I_SSB is three least significant bits (LSBs) least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 8, and the I_SSB is three LSBs of the SSB index in case that the number of the SSB indices is 64.   
     
     
       37. The base station of  claim 31 , wherein the I_t=4*I_HF+I_SSB in case that a number of SSB indices is 4, and
 wherein I_HF is a half frame index and I_SSB is two least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 4.   
     
     
       38. The base station of  claim 31 , wherein the timing information includes two bits of the SSB index and one bit of a half frame index. 
     
     
       39. A terminal in a communication system, the terminal comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to:
 identify resources for receiving a demodulation reference signal (DMRS) sequence associated with a pseudo-noise (PN) sequence, wherein the DMRS sequence is for a physical broadcast channel (PBCH), and 
 receive, from a base station, the DMRS sequence, 
   wherein an initial value c_B of the PN sequence is defined based on
   c_B=2^11*(I_t+1)*(└I_ID/4┘+1)+2^6*(I_t+1)+mod(I_ID,4),
 
   where I_ID is a physical cell identification (ID) and I_t is timing information defined based on at least one of a system frame number (SFN) or a synchronization signal block (SSB) index.   
     
     
       40. The terminal of  claim 39 , wherein the DMRS sequence is identified among a plurality of candidate DMRS sequences based on a number of SSB indices. 
     
     
       41. The terminal of  claim 39 , wherein the timing information is defined based on two bits of the SSB index and one bit of a half frame index in case that a number of SSB indices is 4. 
     
     
       42. The terminal of  claim 39 , wherein the timing information is defined based on three bits of the SSB index in case that a number of the SSB indices is 8. 
     
     
       43. The terminal of  claim 39 , wherein the timing information is defined based on three least significant bits (LSBs) of SSB index in case that a number of the SSB indices is 64. 
     
     
       44. The terminal of  claim 39 ,
 wherein I_t=I_SSB in case that a number of SSB indices is 8 or 64, and   wherein I_SSB is three least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 8, and the I_SSB is three LSBs of the SSB index in case that the number of the SSB indices is 64.   
     
     
       45. The terminal of  claim 39 , wherein the I t=4*I HF+I SSB in case that a number of SSB indices is 4, and
 wherein I_HF is a half frame index and I_SSB is two least significant bits (LSBs) of the SSB index in case that the number of SSB indices is 4.   
     
     
       46. The terminal of  claim 39 , wherein the timing information includes two bits of the SSB index and one bit of a half frame index.