Method for receiving downlink signal and channel in wireless communication system, and device therefor
A method, performed by a terminal, for receiving a downlink signal and channel in a wireless communication system comprises the steps of: receiving a synchronization signals and PBCH block (SSB) from a base station; and transmitting an uplink channel to the base station on the basis of the SSB.
1 . A method performed by a terminal configured to operate in a wireless communication system, comprising:
receiving a synchronization signals and physical broadcast channel block (SSB) from a base station; and
transmitting an uplink channel to the base station, based on the SSB,
wherein i) in case that a subcarrier spacing (SCS) is 480 KHz or 960 KHz,
the SSB is transmitted on symbols mapped to a first SSB candidate and a second SSB candidate, each of which is configured by four symbols,
the first SSB candidate and the second SSB candidate are mapped on one slot, and
a start symbol to which the first SSB candidate is mapped is a third symbol of the one slot, a start symbol to which the second SSB candidate is mapped is a tenth symbol of the one slot, and at least one gap symbol is located between the first SSB candidate and the second SSB candidate, and
ii) in case that the subcarrier spacing (SCS) is 120 KHz,
the SSB is transmitted on symbols mapped to a third SSB candidate, a fourth SSB candidate, a fifth SSB candidate, and a sixth SSB candidate, each of which is configured by four symbols,
the third SSB candidate, the fourth SSB candidate, the fifth SSB candidate, and the sixth SSB candidate are mapped on two slots, and
a start symbol to which the third SSB candidate is mapped is a fifth symbol of the two slots, a start symbol to which the fourth SSB candidate is mapped is a ninth symbol of the two slots, a start symbol to which the fifth SSB candidate is mapped is a seventeenth symbol of the two slots, and a start symbol to which the sixth SSB candidate is mapped is a twenty-first symbol of the two slots.
2 . The method of claim 1 , wherein the SSB is mapped to four consecutive symbols.
3 . The method of claim 1 , wherein in case that the SCS is 480 KHz or 960 KHz, a first symbol, a second symbol, an eighth symbol, and a ninth symbol of the one slot are resources allocated for a control resource set (CORESET).
4 . The method of claim 1 , wherein in case that the SCS is 480 KHz or 960 KHz, the at least one gap symbol includes a seventh symbol of the one slot.
5 . The method of claim 1 , wherein in case that the subcarrier spacing (SCS) is 480 KHz or 960 KHz, the one slot is configured by a first half slot configured by seven symbols and a second half slot configured by seven symbols, and
the first SSB candidate and the second SSB candidate are mapped to the first half slot and the second half slot in an identical form, respectively.
6 . The method of claim 1 , wherein in case that the SCS is 480 KHz or 960 KHz, the at least one gap symbol includes a last symbol of the one slot.
7 . The method of claim 1 , wherein in case that the SCS is 120 KHz, the SSB is transmitted within a discovery burst transmission window (DBTW),
the DBTW is a resource having a maximum length of 5 ms, and
multiple SSB candidates are transmittable in the DBTW.
8 . The method of claim 7 , wherein the DBTW is configured by 40 slots,
the third SSB candidate, the fourth SSB candidate, the fifth SSB candidate, and the sixth SSB candidate are repeatedly mapped on a first slot set configured by slots other than a ninth slot, a tenth slot, a nineteenth slot, a twentieth slot, a twenty-ninth slot, a thirtieth slot, a thirty-ninth slot, and a fortieth slot among the 40 slots, and
each of the slots configuring the first slot set comprises a first SSB candidate index and a second candidate SSB index.
9 . The method of claim 8 , wherein locations of SSB candidates mapped to odd-numbered slots among the slots configuring the first slot set are the same as locations to which the third SSB candidate and the fourth SSB candidate are mapped, and
locations of SSB candidates mapped to even-numbered slots among the slots configuring the first slot set are the same as locations to which the fifth SSB candidate and the sixth SSB candidate are mapped.
10 . The method of claim 8 , wherein the multiple SSB candidates capable of transmitting the SSB are additionally mapped on a second slot set configured by the ninth slot, the tenth slot, the nineteenth slot, the twentieth slot, the twenty-ninth slot, the thirtieth slot, the thirty-ninth slot, and the fortieth slot among the 40 slots, and
each of the slots configuring the second slot set comprises a third SSB candidate index and a fourth SSB candidate index.
11 . The method of claim 10 , wherein locations of SSB candidates mapped to the odd-numbered slots among the slots configuring the second slot set are the same as locations to which the third SSB candidate and the fourth SSB candidate are mapped, and
locations of SSB candidates mapped to the even-numbered slots among the slots configuring the second slot set are the same as locations to which the fifth SSB candidate and the sixth SSB candidate are mapped.
12 . The method of claim 10 , further comprising receiving, from the base station, an indicator indicating that the multiple SSB candidates have been additionally mapped on the second slot set.
13 . The method of claim 1 ,
wherein the SSB is transmitted on symbols mapped to a plurality of SSB candidates,
wherein the plurality of SSB candidates are mapped to a plurality of slots,
wherein the plurality of SSB candidates are indexed,
receiving, from the base station, information related to an index of the plurality of SSB candidates,
wherein the information is included in a master information block (MIB).
14 . A terminal configured to operate in a wireless communication system, the terminal comprising:
a communication module; and
a processor configured to control the communication module,
wherein the processor is configured to:
receive a synchronization signals and physical broadcast channel block (SSB) from a base station; and
transmit an uplink channel to the base station, based on the SSB,
wherein i) in case that a subcarrier spacing (SCS) is 480 KHz or 960 KHz,
the SSB is transmitted on symbols mapped to a first SSB candidate and a second SSB candidate, each of which is configured by four symbols,
the first SSB candidate and the second SSB candidate are mapped on one slot, and
a start symbol to which the first SSB candidate is mapped is a third symbol of the one slot, a start symbol to which the second SSB candidate is mapped is a tenth symbol of the one slot, and at least one gap symbol is located between the first SSB candidate and the second SSB candidate, and
ii) in case that the subcarrier spacing (SCS) is 120 KHz,
the SSB is transmitted on symbols mapped to a third SSB candidate, a fourth SSB candidate, a fifth SSB candidate, and a sixth SSB candidate, each of which is configured by four symbols,
the third SSB candidate, the fourth SSB candidate, the fifth SSB candidate, and the sixth SSB candidate are mapped on two slots, and
a start symbol to which the third SSB candidate is mapped is a fifth symbol of the two slots, a start symbol to which the fourth SSB candidate is mapped is a ninth symbol of the two slots, a start symbol to which the fifth SSB candidate is mapped is a seventeenth symbol of the two slots, and a start symbol to which the sixth SSB candidate is mapped is a twenty-first symbol of the two slots.
15 . The terminal of claim 14 , wherein the SSB is mapped to four consecutive symbols.
16 . The terminal of claim 14 , wherein in case that the SCS is 480 KHz or 960 KHz, a first symbol, a second symbol, an eighth symbol, and a ninth symbol of the one slot are resources allocated for a control resource set (CORESET).
17 . The terminal of claim 14 , wherein in case that the SCS is 480 KHz or 960 KHz, the at least one gap symbol includes a seventh symbol of the one slot.
18 . A method performed by a base station configured to operate in a wireless communication system, the method comprising:
transmitting a synchronization signals and physical broadcast channel block (SSB) to a terminal; and
receiving an uplink channel based on the SSB from the terminal,
wherein i) in case that a subcarrier spacing (SCS) is 480 KHz or 960 KHz,
the SSB is transmitted on symbols mapped to a first SSB candidate and a second SSB candidate, each of which is configured by four symbols,
the first SSB candidate and the second SSB candidate are mapped on one slot, and
a start symbol to which the first SSB candidate is mapped is a third symbol of the one slot, a start symbol to which the second SSB candidate is mapped is a tenth symbol of the one slot, and at least one gap symbol is located between the first SSB candidate and the second SSB candidate, and
ii) in case that the subcarrier spacing (SCS) is 120 KHz,
the SSB is transmitted on symbols mapped to a third SSB candidate, a fourth SSB candidate, a fifth SSB candidate, and a sixth SSB candidate, each of which is configured by four symbols,
the third SSB candidate, the fourth SSB candidate, the fifth SSB candidate, and the sixth SSB candidate are mapped on two slots, and
a start symbol to which the third SSB candidate is mapped is a fifth symbol of the two slots, a start symbol to which the fourth SSB candidate is mapped is a ninth symbol of the two slots, a start symbol to which the fifth SSB candidate is mapped is a seventeenth symbol of the two slots, and a start symbol to which the sixth SSB candidate is mapped is a twenty-first symbol of the two slots.