Method and apparatus for control channel reception in wireless communication systems
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure discloses a signaling method and apparatus for properly increasing a control channel detection complexity of a terminal in order to efficiently detect a control channel for performing coordinated transmission such as non-coherent joint transmission (NC-JT).
1. A method performed by a terminal in a communication system, the method comprising:
identifying a number of cells associated with a capability for monitoring a physical downlink control channel (PDCCH) based on a number of cells in a first set and a product of a number of cells in a second set and a coefficient, wherein the coefficient for the second set is associated with a number of a transmit and receive point (TRP), configured to each of the cells in the second set;
determining a maximum number of control channel elements (CCEs) for the PDCCH based on the number of cells associated with the capability;
identifying search spaces to monitor based on the maximum number of CCEs; and
monitoring the PDCCH on the identified search spaces.
2. The method of claim 1 , wherein the maximum number of CCEs is determined based on whether the number of cells associated with the capability is equal to or less than a number of configured cells which is determined based on at least one TRP configured to each cell or not.
3. The method of claim 2 , wherein in case that the number of cells associated with the capability is equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined as a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell or a multiple of the preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell based on the at least one TRP configured to the cell.
4. The method of claim 2 , wherein in case that the number of cells associated with the capability is not equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined based on a number C total,μ corresponding to following equation:
C
total
,
μ
=
⌊
N
cap
·
C
μ
·
N
μ
N
total
⌋
,
where N cap is the number of cells associated with the capability, C μ is a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of a cell μ, N μ is a number of at least one configured cells corresponding to the subcarrier spacing of the cell μ determined based on the at least one TRP configured to the cell, and N total is the number of configured cells.
5. The method of claim 1 , wherein the coefficient is 2.
6. A method performed by a base station in a communication system, the method comprising:
identifying a number of cells associated with a capability for monitoring a physical downlink control channel (PDCCH) based on a number of cells in a first set and a product of a number of cells in a second set and a coefficient, wherein the coefficient for the second set is associated with a number of a transmit and receive point (TRP), configured to each of the cells in the second set;
determining a maximum number of control channel elements (CCEs) for the PDCCH based on the number of cells associated with the capability;
identifying search spaces to monitor based on the maximum number of CCEs; and
transmitting downlink control channel on the PDCCH based on the identified search spaces.
7. The method of claim 6 , wherein the maximum number of CCEs is determined based on whether the number of cells associated with the capability is equal to or less than a number of configured cells which is determined based on at least one TRP configured to each cell or not.
8. The method of claim 7 , wherein in case that the number of cells associated with the capability is equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined as a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell or a multiple of the preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell based on the at least one TRP configured to the cell.
9. The method of claim 7 , wherein in case that the number of cells associated with the capability is not equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined based on a number C total,μ corresponding to following equation:
C
total
,
μ
=
⌊
N
cap
·
C
μ
·
N
μ
N
total
⌋
,
where N cap is the number of cells associated with the capability, C μ is a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of a cell μ, N μ is a number of at least one configured cells corresponding to the subcarrier spacing of the cell μ determined based on the at least one TRP configured to the cell, and N total is the number of configured cells.
10. The method of claim 6 , wherein the coefficient is 2.
11. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
identify a number of cells associated with a capability for monitoring a physical downlink control channel (PDCCH) based on a number of cells in a first set and a product of a number of cells in a second set and a coefficient, wherein the coefficient for the second set is associated with a number of a transmit and receive point (TRP), configured to each of the cells in the second set,
determine a maximum number of control channel elements (CCEs) for the PDCCH based on the number of cells associated with the capability,
identify search spaces to monitor based on the maximum number of CCEs, and
monitor the PDCCH on the identified search spaces.
12. The terminal of claim 11 , wherein the maximum number of CCEs is determined based on whether the number of cells associated with the capability is equal to or less than a number of configured cells which is determined based on at least one TRP configured to each cell or not.
13. The terminal of claim 12 , wherein in case that the number of cells associated with the capability is equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined as a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell or a multiple of the preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell based on the at least one TRP configured to the cell.
14. The terminal of claim 12 , wherein in case that the number of cells associated with the capability is not equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined based on a number C total corresponding to following equation:
C
total
,
μ
=
⌊
N
cap
·
C
μ
·
N
μ
N
total
⌋
,
where N cap is the number of cells associated with the capability, C μ is a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of a cell μ, N μ is a number of at least one configured cells corresponding to the subcarrier spacing of the cell μ determined based on the at least one TRP configured to the cell, and N total is the number of configured cells.
15. The terminal of claim 11 , wherein the coefficient is 2.
16. A base station in a communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
identify a number of cells associated with a capability for monitoring a physical downlink control channel (PDCCH) based on a number of cells in a first set and a product of a number of cells in a second set and a coefficient, wherein the coefficient for the second set is associated with a number of a transmit and receive point (TRP), configured to each of the cells in the second set,
determine a maximum number of control channel elements (CCEs) for the PDCCH based on the number of cells associated with the capability,
identify search spaces to monitor based on the maximum number of CCEs, and
transmit downlink control channel on the PDCCH based on the identified search spaces.
17. The base station of claim 16 , wherein the maximum number of CCEs is determined based on whether the number of cells associated with the capability is equal to or less than a number of configured cells which is determined based on at least one TRP configured to each cell or not.
18. The base station of claim 17 , wherein in case that the number of cells associated with the capability is equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined as a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell or a multiple of the preconfigured maximum number of CCEs corresponding to a subcarrier spacing of the cell based on the at least one TRP configured to the cell.
19. The base station of claim 17 , wherein in case that the number of cells associated with the capability is not equal to or less than the number of configured cells, the maximum number of CCEs for a cell is determined based on a number C total corresponding to following equation:
C
total
,
μ
=
⌊
N
cap
·
C
μ
·
N
μ
N
total
⌋
,
where N cap is the number of cells associated with the capability, C μ is a preconfigured maximum number of CCEs corresponding to a subcarrier spacing of a cell μ, N μ is a number of at least one configured cells corresponding to the subcarrier spacing of the cell μ determined based on the at least one TRP configured to the cell, and N total is the number of configured cells.
20. The base station of claim 16 , wherein the coefficient is 2.