Method and apparatus for transmitting and receiving synchronization signal block

1. A method of receiving a synchronization signal block (SSB) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station (BS), a downlink signal in a frequency band that is greater than 6 GHz; and

processing the received downlink signal to obtain at least one SSB comprising a plurality of symbols,

wherein the downlink signal comprises a plurality of candidate SSB regions in which the at least one SSB can be received,

wherein, for a subcarrier spacing of 120 kHz, first symbol positions for the plurality of candidate SSB regions within a half-frame are indexed by {4, 8, 16, 20}+28*n, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, and where n=0 is an initial symbol position in the half-frame, and

wherein, for the subcarrier spacing of 240 kHz, the first symbol positions for the plurality of candidate SSB regions within the half-frame are indexed by {8, 12, 16, 20, 32, 36, 40, 44}+56*n, where n=0, 1, 2, 3, 5, 6, 7, 8, and where n=0 is the initial symbol position in the half-frame.

2. The method according to claim 1 , wherein each candidate SSB region among the plurality of candidate SSB regions is defined by 4 candidate SSBs that are disposed in 4 time-consecutive symbols starting at the respective first symbol position of the candidate SSB region.

3. The method according to claim 1 , wherein the half-frame spans a plurality of time slots, each time slot having a duration of 14 symbols,

wherein the half-frame comprises a plurality of unit regions, with each unit region spanning a first number of time slots among the plurality of time slots of the half-frame, and

wherein in each unit region:

two groups of candidate SSB regions are separated by a first number of symbols, with each group defined by a plurality of adjacent SSB regions,

a first group of adjacent candidate SSB regions among the two groups is preceded by the first number of symbols in the unit region, and

a second group of adjacent candidate SSB regions among the two groups is followed by the first number of symbols in the unit region.

4. The method according to claim 3 , wherein for the subcarrier spacing of 120 kHz, the first number of time slots in each unit region is equal to 2 time slots,

wherein the first number of symbols that separate the two groups of candidate SSB regions in the unit region is equal to 4 symbols, and

wherein each group among the two groups is defined by 2 adjacent candidate SSB regions spanning 8 consecutive symbols in time.

5. The method according to claim 3 , wherein for the subcarrier spacing of 240 kHz, the first number of time slots in each unit region is equal to 4 time slots,

wherein the first number of symbols that separate the two groups of candidate SSB regions in the unit region is equal to 8 symbols, and

wherein each group among the two groups is defined by 4 adjacent candidate SSB regions spanning 16 consecutive symbols in time.

6. The method according to claim 3 , wherein the half-frame comprising the plurality of unit regions is defined by 16 unit regions, and

wherein the 16 unit regions in the half-frame are distributed in 4 sets of 4 adjacent unit regions in each set, with each set separated by an interval that is equal to a duration of a single unit region.

7. The method according to claim 6 , wherein the duration of a single unit region is equal to 0.25 ms,

wherein for the subcarrier spacing of 120 kHz, the single unit region spans 2 time slots, and

wherein for the subcarrier spacing of 240 kHz, the single unit region spans 4 time slots.

8. The method of claim 3 , wherein for the subcarrier spacing of 120 kHz, each time slot has a duration of 0.125 ms, and

wherein for the subcarrier spacing of 240 kHz, each time slot has a duration of 0.0625 ms.

9. The method of claim 1 , wherein the half-frame has a duration of 5 ms.

10. A user equipment (UE) configured to receive a synchronization signal block (SSB) in a wireless communication system, the UE comprising:

a transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:

receiving, from a base station (BS) through the transceiver, a downlink signal in a frequency band that is greater than 6 GHz; and

processing the received downlink signal to obtain at least one SSB comprising a plurality of symbols,

wherein the downlink signal comprises a plurality of candidate SSB regions in which the at least one SSB can be received,

wherein, for a subcarrier spacing of 120 kHz, first symbol positions for the plurality of candidate SSB regions within a half-frame are indexed by {4, 8, 16, 20}+28*n, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, and where n=0 is an initial symbol position in the half-frame, and

wherein, for the subcarrier spacing of 240 kHz, the first symbol positions for the plurality of candidate SSB regions within the half-frame are indexed by {8, 12, 16, 20, 32, 36, 40, 44}+56*n, where n=0, 1, 2, 3, 5, 6, 7, 8, and where n=0 is the initial symbol position in the half-frame.

11. A method of transmitting, by a base station (BS), a synchronization signal block (SSB) in a wireless communication system, the method comprising:

determining a downlink signal comprising at least one SSB comprising a plurality of symbols; and

transmitting, to a user equipment (UE), the downlink signal in a frequency band that is greater than 6 GHz,

wherein the downlink signal comprises a plurality of candidate SSB regions in which the at least one SSB can be received by the UE,

wherein, for a subcarrier spacing of 120 kHz, first symbol positions for the plurality of candidate SSB regions within a half-frame are indexed by {4, 8, 16, 20}+28*n, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, and where n=0 is an initial symbol position in the half-frame, and

wherein, for the subcarrier spacing of 240 kHz, the first symbol positions for the plurality of candidate SSB regions within the half-frame are indexed by {8, 12, 16, 20, 32, 36, 40, 44}+56*n, where n=0, 1, 2, 3, 5, 6, 7, 8, and where n=0 is the initial symbol position in the half-frame.

12. A base station (BS) configured to transmit a synchronization signal block (SSB) in a wireless communication system, the BS comprising:

a transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:

determining a downlink signal comprising at least one SSB comprising a plurality of symbols; and

transmitting, to a user equipment (UE) through the transceiver, the downlink signal in a frequency band that is greater than 6 GHz,

wherein the downlink signal comprises a plurality of candidate SSB regions in which the at least one SSB can be received by the UE,

wherein, for a subcarrier spacing of 120 kHz, first symbol positions for the plurality of candidate SSB regions within a half-frame are indexed by {4, 8, 16, 20}+28*n, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, and where n=0 is an initial symbol position in the half-frame, and

wherein, for the subcarrier spacing of 240 kHz, the first symbol positions for the plurality of candidate SSB regions within the half-frame are indexed by {8, 12, 16, 20, 32, 36, 40, 44}+56*n, where n=0, 1, 2, 3, 5, 6, 7, 8, and where n=0 is the initial symbol position in the half-frame.