Method and apparatus for nr sidelink ss/pbch block

Abstract

A method of a first UE comprises: determining a sidelink synchronization identity (SL-SID) and a set of resources; generating at least one sidelink synchronization signal and physical broadcast channel (S-SSB) based on the SL-SID and the set of resources, wherein each S-SSB of the at least one S-SSB includes first two symbols for a sidelink primary synchronization signal (S-PSS) and second two symbols for a sidelink secondary synchronization signal (S-SSS); generating a first sequence corresponding to the S-PSS, wherein the first sequence is determined based on a binary phase shift keying (BPSK) modulated M-sequence with a 127 of sequence length and a low cross-correlation with a PSS; generating a second sequence corresponding to the S-SSS, wherein the second sequence is determined based on a BPSK modulated Gold-sequence with a 127 of sequence length; and transmitting, the at least one S-SSB over sidelink channels established with the second UE.

What is claimed is: 
     
         1 . A first user equipment (UE) in a wireless communication system, the first UE comprising:
 a processor configured to:
 identify a first sequence corresponding to a sidelink-primary synchronization signal (S-PSS) and a second sequence corresponding to a sidelink-secondary synchronization signal (S-SSS), and 
 identify a sidelink-synchronization signal and physical broadcast channel block (S-SSB) including the S-PSS based on the first sequence, the S-SSS based on the second sequence, a physical sidelink broadcast channel (PSBCH), and a demodulation reference signal (DMRS) for the PSBCH; 
   a transceiver operably connected to the processor, the transceiver configured to transmit, to a second UE, the S-SSB over sidelink channels,   wherein the S-SSB includes two symbols for S-PSS and two symbols for the S-SSS,   wherein the first sequence is identified based on a predefined value related to cyclic shift, and a sidelink-synchronization identity (SL-SID),   wherein the predefined value is 22,   wherein the two symbols for the S-PSS are second and third symbols in the S-SSB, and   wherein the two symbols for the S-SSS are fourth and fifth symbols in the S-SSB.   
     
     
         2 . The first UE of  claim 1 , wherein:
 a symbol for the PSBCH and the DMRS for the PSBCH is a first symbol in the S-SSB, and   symbols for the PSBCH and the DMRS for the PSBCH are sixth and subsequent symbols in the S-SSB.   
     
     
         3 . The first UE of  claim 1 , wherein:
 the transceiver is further configured to transmit, based on a periodicity, the S-SSB using a set of resources including time-domain resources that are configurable within the periodicity,   a configuration of the time-domain resources within the periodicity is indicated via the PSBCH included in the S-SSB,   the first sequence is determined based on a binary phase shift keying (BPSK) modulated M-sequence with a sequence length of 127,   the second sequence is determined based on a BPSK modulated Gold-sequence with a sequence length of 127, and   the predefined value is related to a maximum distance from cyclic shifts used for a primary synchronization signal (PSS).   
     
     
         4 . The first UE of  claim 1 , wherein:
 the processor further is configured to:
 determine the SL-SID and a set of resources; and 
 identify the S-SSB based on the SL-SID and the set of resources, 
   the set of resources include frequency-domain resources for transmitting the S-SSB, and   the frequency-domain resources are pre-configured.   
     
     
         5 . The first UE of  claim 1 , wherein:
 the first sequence corresponding to the S-PSS (d_SPSS) is determined by a polynomial given by:
     g ( x )= x   7   +x+ 1, 
 where a M-sequence is generated with x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and 
   the first sequence corresponding to the S-PSS is given by:
     d _ SPSS ( n )=1−2* x ( n ),
 
     m =( n+ 43* N _ GID{circumflex over ( )}SL+ 22)mod 127, 0≤ n< 127,
 
 where x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and x(6:0)=[0 0 0 0 0 0 1]. 
   
     
     
         6 . The first UE of  claim 1 , wherein:
 the second sequence corresponding to the S-SSS (d_SSSS) is given by:
     d _ SSSS ( n )=(1−2* x _0( n _0))*(1−2* x _1( n _1)),
 
     n _0=( n+m _0)mod 127, 
     n _1=( n+m _1)mod 127, 
     m _0=15 *└N _ID/112┘,
 
     m _1= N _ID mod 112, 0≤ n< 127,
 
 where:
 x_0(n_0) is a first M-sequence given by x_0(i+7)=x_0(i+1)+x_0(i) for i=0, 1, . . . , 119, and x_0(6:0)=[0 0 0 0 0 0 1]; 
 x_1(n_1) is a second M-sequence given by x_1(i+7)=x_1(i+1)+x_1(i) for i=0, 1, . . . , 119, and x_1(6:0)=[0 0 0 0 0 0 1]; and 
 N_ID is a SL-SID. 
 
   
     
     
         7 . A second user equipment (UE) in a wireless communication system, the second UE comprising:
 a transceiver configured to receive, from a first UE, a sidelink-synchronization signal and physical broadcast channel block (S-SSB) over sidelink channels; and   a processor operably connected to the transceiver, the processor configured to identify, from the S-SSB, a sidelink-primary synchronization signal (S-PSS) identified based on a first sequence, a second sequence corresponding to a sidelink-secondary synchronization signal (S-SSS) identified based on a second sequence, a physical sidelink broadcast channel (PSBCH), and a demodulation reference signal (DMRS) for the PSBCH;   wherein the S-SSB includes two symbols for S-PSS and two symbols for the S-SSS,   wherein the first sequence is identified based on a predefined value related to cyclic shift, and a sidelink-synchronization identity (SL-SID),   wherein the predefined value is 22,   wherein the two symbols for the S-PSS are second and third symbols in the S-SSB, and   wherein the two symbols for the S-SSS are fourth and fifth symbols in the S-SSB.   
     
     
         8 . The second UE of  claim 7 , wherein:
 a symbol for the PSBCH and the DMRS for the PSBCH is a first symbol in the S-SSB, and   symbols for the PSBCH and the DMRS for the PSBCH are sixth and subsequent symbols in the S-SSB.   
     
     
         9 . The second UE of  claim 7 , wherein:
 the transceiver is further configured to receive, based on a periodicity, the S-SSB using a set of resources including time-domain resources that are configurable within the periodicity,   a configuration of the time-domain resources within the periodicity is identified via the PSBCH included in the S-SSB,   the first sequence is determined based on a binary phase shift keying (BPSK) modulated M-sequence with a sequence length of 127,   the second sequence is determined based on a BPSK modulated Gold-sequence with a sequence length of 127, and   the predefined value is related to a maximum distance from cyclic shifts used for a primary synchronization signal (PSS).   
     
     
         10 . The second UE of  claim 7 , wherein:
 the S-SSB is identified based on the SL-SID and a set of resources,   the set of resources include frequency-domain resources for receiving the S-SSB, and   the frequency-domain resources are pre-configured.   
     
     
         11 . The second UE of  claim 7 , wherein:
 the first sequence corresponding to the S-PSS (d_SPSS) is determined by a polynomial given by:
     g ( x )= x   7   +x+ 1, 
 where a M-sequence is generated with x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and 
   the first sequence corresponding to the S-PSS is given by:
     d _ SPSS ( n )=1−2* x ( n ),
 
     m =( n+ 43* N _ GID{circumflex over ( )}SL+ 22)mod 127, 0≤ n< 127,
 
 where x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and x(6:0)=[0 0 0 0 0 0 1]. 
   
     
     
         12 . The second UE of  claim 7 , wherein:
 the second sequence corresponding to the S-SSS (d_SSSS) is given by:
     d _ SSSS ( n )=(1−2* x _0( n _0))*(1−2* x _1( n _1)),
 
     n _0=( n+m _0)mod 127, 
     n _1=( n+m _1)mod 127, 
     m _0=15 *└N _ID/112┘,
 
     m _1= N _ID mod 112, 0≤ n< 127,
 
 where:
 x_0(n_0) is a first M-sequence given by x_0(i+7)=x_0(i+1)+x_0(i) for i=0, 1, . . . , 119, and x_0(6:0)=[0 0 0 0 0 0 1]; 
 x_1(n_1) is a second M-sequence given by x_1(i+7)=x_1(i+1)+x_1(i) for i=0, 1, . . . , 119, and x_1(6:0)=[0 0 0 0 0 0 1]; and 
 N_ID is a SL-SID. 
 
   
     
     
         13 . A method for operating a first user equipment (UE) in a wireless communication system, the method comprising:
 identifying a first sequence corresponding to a sidelink-primary synchronization signal (S-PSS) and a second sequence corresponding to a sidelink-secondary synchronization signal (S-SSS);   identifying a sidelink-synchronization signal and physical broadcast channel block (S-SSB) including the S-PSS based on the first sequence, the S-SSS based on the second sequence, a physical sidelink broadcast channel (PSBCH), and a demodulation reference signal (DMRS) for the PSBCH; and   transmitting, to a second UE, the S-SSB over sidelink channels,   wherein the S-SSB includes two symbols for S-PSS and two symbols for the S-SSS,   wherein the first sequence is identified based on a predefined value related to cyclic shift, and a sidelink-synchronization identity (SL-SID),   wherein the predefined value is 22,   wherein the two symbols for the S-PSS are second and third symbols in the S-SSB, and   wherein the two symbols for the S-SSS are fourth and fifth symbols in the S-SSB.   
     
     
         14 . The method of  claim 13 , wherein:
 a symbol for the PSBCH and the DMRS for the PSBCH is a first symbol in the S-SSB, and   symbols for the PSBCH and the DMRS for the PSBCH are sixth and subsequent symbols in the S-SSB.   
     
     
         15 . The method of  claim 13 , wherein:
 transmitting the S-SSB comprises transmitting, based on a periodicity, the S-SSB using a set of resources including time-domain resources that are configurable within the periodicity,   a configuration of the time-domain resources within the periodicity is indicated via the PSBCH included in the S-SSB,   the first sequence is determined based on a binary phase shift keying (BPSK) modulated M-sequence with a sequence length of 127,   the second sequence is determined based on a BPSK modulated Gold-sequence with a sequence length of 127, and   the predefined value is related to a maximum distance from cyclic shifts used for a primary synchronization signal (PSS).   
     
     
         16 . The method of  claim 13 , further comprising:
 determining the SL-SID and a set of resources,   wherein identifying the S-SSB comprises generating the S-SSB based on the SL-SID and the set of resources,   the set of resources include frequency-domain resources for transmitting the S-SSB, and   the frequency-domain resources are pre-configured.   
     
     
         17 . The method of  claim 13 , wherein:
 the first sequence corresponding to the S-PSS (d_SPSS) is determined by a polynomial given by:
     g ( x )= x   7   +x+ 1, 
 where a M-sequence is generated with x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and 
   the first sequence corresponding to the S-PSS is given by:
     d _ SPSS ( n )=1−2* x ( n ),
 
     m =( n+ 43* N _ GID{circumflex over ( )}SL+ 22)mod 127, 0≤ n< 127,
 
 where x(i+7)=x(i+1)+x(i) for i=0, 1, . . . , 119, and x(6:0)=[0 0 0 0 0 0 1]. 
   
     
     
         18 . The method of  claim 13 , wherein:
 the second sequence corresponding to the S-SSS (d_SSSS) is given by:
     d _ SSSS ( n )=(1−2* x _0( n _0))*(1−2* x _1( n _1)),
 
     n _0=( n+m _0)mod 127, 
     n _1=( n+m _1)mod 127, 
     m _0=15 *└N _ID/112┘,
 
     m _1= N _ID mod 112, 0≤ n< 127,
 
 where:
 x_0(n_0) is a first M-sequence given by x_0(i+7)=x_0(i+1)+x_0(i) for i=0, 1, . . . , 119, and x_0(6:0)=[0 0 0 0 0 0 1]; 
 x_1(n_1) is a second M-sequence given by x_1(i+7)=x_1(i+1)+x_1(i) for i=0, 1, . . . , 119, and x_1(6:0)=[0 0 0 0 0 0 1]; and 
 N_ID is a SL-SID.