Method and apparatus for NR sidelink SS/PBCH block

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.

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.