Method and apparatus for NR sidelink SS/PBCH block
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.
1. A first user equipment (UE) in a wireless communication system, the first UE comprising:
at least one processor configured to:
determine a sidelink synchronization identity (SL-SID), a numerology, and a set of resources, the numerology including a subcarrier spacing and a cyclic prefix (CP) length;
generate at least one sidelink synchronization signal and physical broadcast channel block (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);
generate 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 lowcross-correlation with a primary synchronization signal (PSS); and
generate 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
a transceiver operably connected to the at least one processor, the transceiver configured to transmit, to a second UE, the at least one S-SSB over sidelink channels established with the second UE,
wherein the second sequence corresponding to the S-SSS 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_IDinG{circumflex over ( )}SL/112┘+5*N_GID{circumflex over ( )}SL, m_1=N_IDinG{circumflex over ( )}SL 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]; N_IDinG{circumflex over ( )}SL is a first part of the determined SL-SID; and N_GID{circumflex over ( )}SL is a second part of the determined SL-SID.
2. The first UE of claim 1 , wherein the first two symbols for the S-PSS comprise second and third symbols within the S-SSB, and wherein the generated first sequence corresponding to the S-PSS is repeatedly mapped to the first two symbols for the S-PSS.
3. The first UE of claim 1 , wherein the second two symbols for the S-SSS comprise fourth and fifth symbols within the S-SSB, and wherein the generated second sequence corresponding to the S-SSS is repeatedly mapped to the second two symbols for the S-SSS.
4. The first UE of claim 1 , wherein;
the at least one processor is further configured to determine a number of symbols for S-SSB based on the determined CP length,
the number of symbols for S-SSB is determined as 13 when the determined CP length is a normal CP length, and
the number of symbols for S-SSB is determined as 11 when the determined CP length is an extended CP length.
5. The first UE of claim 1 , wherein the at least one processor is further configured to determine a first symbol within the S-SSB is a first orthogonal frequency division multiplexing (OFDM) symbol of a slot.
6. The first UE of claim 1 , wherein the first sequence corresponding to the S-PSS is determined by a polynomial given by g(x)=x 7 +x 4 +1 where a M-sequence is generated with x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119.
7. The first UE of claim 6 , wherein the first sequence corresponding to the S-PSS is given by d_SPSS(n)=1−2*x(m), m=(n+43*N_GID{circumflex over ( )}SL+22) mod 127, 0≤n<127, where x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119, and x(6:0)=[1 1 0 1 1 0].
8. A second user equipment (UE) in a wireless communication system, the second UE comprising:
a transceiver configured to receive, from a first UE, at least one sidelink synchronization signal and physical broadcast channel block (S-SSB) over sidelink channels established with the first UE; and
at least one processor operably connected to the transceiver, the at least one processor configured to:
determine a set of resources, wherein the at least one S-SSB is received based on the set of resources, each S-SSB of the at least one S-SSB including first two symbols for a sidelink primary synchronization signal (S-PSS) and second two symbols for a sidelink secondary synchronization signal (S-SSS);
detect a first sequence corresponding to the S-PSS, the first sequence being determined based on a binary phase shift keying (BPSK) modulated M-sequence with a 127 of sequence length and a lowcross-correlation with a primary synchronization signal (PSS);
detect a second sequence corresponding to the S-SSS, the second sequence being determined based on a BPSK modulated Gold-sequence with a 127 of sequence length; and
determine a sidelink synchronization identity (SL-SID) based on the detected second sequence and determine a numerology including a subcarrier spacing and a cyclic prefix (CP) length,
wherein the second sequence corresponding to the S-SSS 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_IDinG{circumflex over ( )}SL/112┘+5*N_GID{circumflex over ( )}SL, m_1=N_IDinG{circumflex over ( )}SL 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]; N_IDinG{circumflex over ( )}SL is a first part of the determined SL-SID; and N_GID{circumflex over ( )}SL is a second part of the determined SL-SID.
9. The second UE of claim 8 , wherein the first two symbols for the S-PSS comprise second and third symbols within the S-SSB, and wherein the determined first sequence corresponding to the S-PSS is repeatedly mapped to the first two symbols for the S-PSS.
10. The second UE of claim 8 , wherein the second two symbols for the S-SSS comprise fourth and fifth symbols within the S-SSB, and wherein the determined second sequence corresponding to the S-SSS is repeatedly mapped to the second two symbols for the S-SSS.
11. The second UE of claim 8 , wherein:
the at least one processor is further configured to determine a number of symbols for S-SSB based on the determined CP length,
the number of symbols for S-SSB is determined as 13 when the determined CP length is a normal CP length, and
the number of symbols for S-SSB is determined as 11 when the determined CP length is an extended CP length.
12. The second UE of claim 8 , wherein the at least one processor is further configured to determine a first symbol within the S-SSB is a first orthogonal frequency division multiplexing (OFDM) symbol of a slot.
13. The second UE of claim 8 , wherein the first sequence corresponding to the S-PSS is determined by a polynomial given by g(x)=x 7 +x 4 +1 where a M-sequence is generated with x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119.
14. The second UE of claim 13 , wherein the first sequence corresponding to the S-PSS is given by d_SPSS(n)=1−2*x(m), m=(n+43*N_GID{circumflex over ( )}SL+22) mod 127, 0≤n<127, where x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119, and x(6:0) [1 1 1 0 1 1 0].
15. A method of a first user equipment (UE) in a wireless communication system, the method comprising:
determining a sidelink synchronization identity (SL-SID), a numerology, and a set of resources, the numerology including a subcarrier spacing and a cyclic prefix (CP) length;
generating at least one sidelink synchronization signal and physical broadcast channel block (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 lowcross-correlation with a primary synchronization signal (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, to a second UE, the at least one S-SSB over sidelink channels established with the second UE,
wherein the second sequence corresponding to the S-SSS 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_IDinG{circumflex over ( )}SL/112]+5*N_GID{circumflex over ( )}SL, m_1=N_IDinG{circumflex over ( )}SL 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]; N_IDinG{circumflex over ( )}SL is a first part of the determined SL-SID; and N_GID{circumflex over ( )}SL is a second part of the determined SL-SID.
16. The method of claim 15 , wherein:
the first two symbols for the S-PSS comprise second and third symbols within the S-SSB;
the generated first sequence corresponding to the S-PSS is repeatedly mapped to the first two symbols for the S-PSS;
the second two symbols for the S-SSS comprise fourth and fifth symbols within the S-SSB; and
the generated second sequence corresponding to the S-SSS is repeatedly mapped to the second two symbols for the S-SSS.
17. The method of claim 15 , further comprising;
determining a number of symbols for S-SSB based on the determined CP length,
wherein the number of symbols for S-SSB is determined as 13 when the determined CP length is a normal CP length, and
wherein the number of symbols for S-SSB is determined as 11 when the determined CP length is an extended CP length.
18. The method of claim 15 , wherein the first sequence corresponding to the S-PSS is given by d_SPSS(n)=1−2*x(m), m=(n+43*N_GID{circumflex over ( )}SL+22) mod 127, 0≤n<127, where x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119, and x(6:0)=[1 1 1 0 1 1].
19. The method of claim 15 , further comprising determining a first symbol within the S-SSB is a first orthogonal frequency division multiplexing (OFDM) symbol of a slot.
20. The method of claim 15 , wherein the first sequence corresponding to the S-PSS is determined by a polynomial given by g(x)=x 7 +x 4 +1 where a M-sequence is generated with x(i+7)=x(i+4)+x(i) for i=0, 1, . . . , 119.