Method and apparatus for configuration of common search space for discovery signal and channel
A method of a UE in a wireless communication system supporting a shared spectrum channel access is provided. The UE comprises: receiving, from a BS over a first downlink channel, a SS/PBCH block; determining a transmission window in which the received SS/PBCH block is located; determining whether a CORESET for Type0-PDCCH CSS is present based on the received SS/PBCH block; determining a parameter for a QCL assumption of candidate SS/PBCH blocks within the transmission window; determining a group of QCLed candidate SS/PBCH blocks within the transmission window based on the determined parameter for the QCL assumption; determining a group of slots including the Type0-PDCCH CSS, wherein each slot of the group of slots corresponds to a candidate SS/PBCH block within the group of QCLed candidate SS/PBCH blocks; and receiving, over a second downlink channel, at least one Type0-PDCCH based on the determined groups of slots including the Type0-PDCCH CSS.
1. A user equipment (UE) in a wireless communication system supporting a shared spectrum channel access, the UE comprising:
at least one transceiver configured to receive, from a base station (BS) over a first downlink channel, a synchronization signals and physical broadcast channel (SS/PBCH) block; and
at least one processor operably connected to the at least one transceiver, the at least one processor configured to:
determine a transmission window in which the received SS/PBCH block is located;
determine whether a control resource set (CORESET) for Type0 physical downlink control channels (Type0-PDCCH) common search space (CSS) is present based on the received SS/PBCH block;
determine a parameter for a quasi-co-location (QCL) assumption of candidate SS/PBCH blocks within the transmission window;
determine a group of QCLed candidate SS/PBCH blocks within the transmission window based on the determined parameter for the QCL assumption; and
determine a group of slots including the Type0-PDCCH CSS, wherein each slot of the group of slots corresponds to a candidate SS/PBCH block within the group of QCLed candidate SS/PBCH blocks,
wherein the at least one transceiver is further configured to receive, from the BS over a second downlink channel, at least one Type0-PDCCH based on the determined groups of slots including the Type0-PDCCH CSS.
2. The UE of claim 1 , wherein the parameter for the QCL assumption is configured by the SS/PBCH block received from the BS, and wherein a value of the parameter is determined from {1, 2, 4, 8}.
3. The UE of claim 1 , wherein a slot of the group of slots including the Type0-PDCCH CSS is located either within the transmission window or outside the transmission window.
4. The UE of claim 1 , wherein the at least one processor is further configured to identify two slots of the group of slots including the Type0-PDCCH CSS, two slots being consecutive in a time domain, and wherein each of the two slots corresponds to a same candidate SS/PBCH block, respectively.
5. The UE of claim 4 , wherein:
an index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 9} for a sub-carrier spacing (SCS) of the candidate SS/PBCH block as 15 kHz; and
the index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 19} for the SCS of the candidate SS/PBCH block as 30 kHz.
6. The UE of claim 4 , wherein:
an index of a first slot of the two slot is determined based on a parameter M that is configured by the SS/PBCH block received from the BS;
a value of the parameter M is determined from {½, 1, 2}; and
a restriction to the value of the parameter M is determined based on the value of the configured parameter for the QCL assumption.
7. The UE of claim 6 , wherein the restriction to the value of the parameter M is not expected to be configured as 2, when the value of the parameter for the QCL assumption is configured as 1.
8. A base station (BS) in a wireless communication system supporting a shared spectrum channel access, the BS comprising:
at least one processor configured to:
determine a transmission window in which a synchronization signal/physical broadcasting channel (SS/PBCH) block is located;
determine whether a control resource set (CORESET) for Type0 physical downlink control channels (Type0-PDCCH) common search space (CSS) is present based on the SS/PBCH block;
determine a parameter for a quasi-co-location (QCL) assumption of candidate SS/PBCH blocks within the transmission window;
determine a group of QCLed candidate SS/PBCH blocks within the transmission window based on the determined parameter for the QCL assumption; and
determine a group of slots including the Type0-PDCCH CSS, wherein each slot of the group of slots corresponds to a candidate SS/PBCH block within the group of QCLed candidate SS/PBCH blocks; and
at least one transceiver operably connected to the at least one processor, the at least one transceiver configured to:
transmit, to a user equipment (UE) over a first downlink channel, the SS/PBCH block; and
transmit, to the UE over a second downlink channel, at least one Type0-PDCCH based on the determined groups of slots including the Type0-PDCCH CSS.
9. The BS of claim 8 , wherein the parameter for the QCL assumption is configured by the SS/PBCH block transmitted to the UE, and wherein a value of the parameter is determined from {1, 2, 4, 8}.
10. The BS of claim 8 , wherein a slot of the group of slots including the Type0-PDCCH CSS is located either within the transmission window or outside the transmission window.
11. The BS of claim 8 , wherein the at least one processor is further configured to identify two slots of the group of slots including the Type0-PDCCH CSS, two slots being consecutive in a time domain, and wherein each of the two slots corresponds to a same candidate SS/PBCH block, respectively.
12. The BS of claim 11 , wherein:
an index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 9} for a sub-carrier spacing (SCS) of the candidate SS/PBCH block as 15 kHz; and
the index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 19} for the SCS of the candidate SS/PBCH block as 30 kHz.
13. The BS of claim 11 , wherein:
an index of a first slot of the two slot is determined based on a parameter M that is configured by the SS/PBCH block received from the BS;
a value of the parameter M is determined from {½, 1, 2}; and
a restriction to the value of the parameter M is determined based on the value of the configured parameter for the QCL assumption.
14. The BS of claim 13 , wherein restriction to the value of the parameter M is not to be configured as 2, when the value of the parameter for the QCL assumption is configured as 1.
15. A method of a user equipment (UE) in a wireless communication system supporting a shared spectrum channel access, the UE comprising:
receiving, from a base station (BS) over a first downlink channel, a synchronization signals and physical broadcast channel (SS/PBCH) block;
determining a transmission window in which the received SS/PBCH block is located;
determining whether a control resource set (CORESET) for Type0 physical downlink control channels (Type0-PDCCH) common search space (CSS) is present based on the received SS/PBCH block;
determining a parameter for a quasi-co-location (QCL) assumption of candidate SS/PBCH blocks within the transmission window;
determining a group of QCLed candidate SS/PBCH blocks within the transmission window based on the determined parameter for the QCL assumption;
determining a group of slots including the Type0-PDCCH CSS, wherein each slot of the group of slots corresponds to a candidate SS/PBCH block within the group of QCLed candidate SS/PBCH blocks; and
receiving, from the BS over a second downlink channel, at least one Type0-PDCCH based on the determined groups of slots including the Type0-PDCCH CSS.
16. The method of claim 15 , wherein the parameter for the QCL assumption is configured by the SS/PBCH block received from the BS, and wherein a value of the parameter is determined from {1, 2, 4, 8}.
17. The method of claim 15 , wherein a slot of the group of slots including the Type0-PDCCH CSS is located either within the transmission window or outside the transmission window.
18. The method of claim 15 , further comprising identifying two slots of the group of slots including the Type0-PDCCH CSS, two slots being consecutive in a time domain, and wherein each of the two slots corresponds to a same candidate SS/PBCH block, respectively.
19. The method of claim 18 , wherein:
an index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 9} for a sub-carrier spacing (SCS) of the candidate SS/PBCH block as 15 kHz; and
the index of the same candidate SS/PBCH block within the transmission window is determined from {0, 1, . . . , 19} for the SCS of the candidate SS/PBCH block as 30 kHz.
20. The method of claim 18 , wherein:
an index of a first slot of the two slot is determined based on a parameter M that is configured by the SS/PBCH block received from the BS;
a value of the parameter M is determined from {½, 1, 2};
a restriction to the value of the parameter M is determined based on the value of the configured parameter for the QCL assumption; and
wherein restriction is, the value of the parameter M is not expected to be configured as 2, when the value of the parameter for the QCL assumption is configured as 1.