Methods and apparatus for UE power savings in initial downlink bandwidth part dedicated to redcap devices
Methods and apparatuses for operating in different bandwidth parts (BWPs). A method includes receiving a first synchronization signal and physical broadcast channel (SS/PBCH) block in a first BWP; determining, based on information provided by the first SS/PBCH block, a first control resource set (CORESET) in the first BWP; and receiving a first physical downlink control channel (PDCCH) in the first CORESET. The PDCCH provides a first downlink control information (DCI) format that schedules a reception of a first physical downlink shared channel (PDSCH) providing a system information block (SIB1). The method further includes receiving the first PDSCH, determining a second BWP based on information provided by the SIB1, and receiving a second SS/PBCH block in the second BWP. The second BWP does not include a bandwidth of the first SS/PBCH block. The second BWP does not include a bandwidth of the first CORESET.
1 . A method performed by a user equipment (UE) with reduced capabilities (RedCap) in a wireless communication system, the method comprising:
receiving, from a base station, a first synchronization signal and physical broadcast channel (SS/PBCH) block which includes system information comprising configuration information for a first initial downlink (DL) bandwidth part (BWP);
receiving, from the base station, a system information block 1 (SIB1) based on the configuration information;
identifying a second initial DL BWP for the UE with RedCap based on the SIB1; and
receiving, from the base station, a physical downlink control channel (PDCCH) in the second initial DL BWP,
wherein, in case that the PDCCH is monitored according to a Type1-PDCCH common search space (CSS) set of the second initial DL BWP, the second initial DL BWP does not include SS/PBCH blocks.
2 . The method of claim 1 , further comprising:
receiving, from the base station, first information configuring a DL BWP for the UE with RedCap; and
receiving, from the base station, a second SS/PBCH block in the DL BWP,
wherein the second SS/PBCH block is a non-cell-defining (NCD) SS/PBCH block, and
wherein the first SS/PBCH block and the second SS/PBCH block with a same index have same quasi co-location (QCL) properties.
3 . The method of claim 2 , further comprising:
receiving, from the base station, second information configuring the second SS/PBCH block,
wherein the second information includes a frequency of the second SS/PBCH block and a periodicity of the second SS/PBCH block, and
wherein the periodicity of the second SS/PBCH block is larger than a periodicity of the first SS/PBCH block.
4 . The method of claim 2 ,
wherein the first SS/PBCH block and the second SS/PBCH block have a same value for at least one property, the at least one property including positions in burst of a SS/PBCH block, a physical cell identifier (PCI) of the SS/PBCH block, and a block power for the SS/PBCH block.
5 . A user equipment (UE) with reduced capabilities (RedCap) in a wireless communication system, the UE with RedCap comprising:
a transceiver; and
a controller coupled with the transceiver, and configured to:
receive, from a base station, a first synchronization signal and physical broadcast channel (SS/PBCH) block which includes system information comprising configuration information for a first initial downlink (DL) bandwidth part (BWP),
receive, from the base station, a system information block 1 (SIB1) based on the configuration information,
identify whether a second initial DL BWP for the UE with RedCap based on the SIB1, and
receive, from the base station, a physical downlink control channel (PDCCH) in the second initial DL BWP, and
wherein, in case that the PDCCH is monitored according to a Type1-PDCCH common search space (CSS) set of the second initial DL BWP, the second initial DL BWP does not include SS/PBCH blocks.
6 . The UE of claim 5 , wherein the controller is further configured to:
receive, from the base station, first information configuring a DL BWP for the UE with RedCap, and
receive, from the base station, a second SS/PBCH block in the DL BWP,
wherein the second SS/PBCH block is a non-cell-defining (NCD) SS/PBCH block, and
wherein the first SS/PBCH block and the second SS/PBCH block with a same index have same quasi co-location (QCL) properties.
7 . The UE of claim 6 , wherein the controller is further configured to:
receive, from the base station, second information configuring the second SS/PBCH block,
wherein the second information includes a frequency of the second SS/PBCH block and a periodicity of the second SS/PBCH block, and
wherein the periodicity of the second SS/PBCH block is larger than a periodicity of the first SS/PBCH block.
8 . The UE of claim 6 ,
wherein the first SS/PBCH block and the second SS/PBCH block have a same value for at least one property, the at least one property including positions in burst of a SS/PBCH block, a physical cell identifier (PCI) of the SS/PBCH block, and a block power for the SS/PBCH block.
9 . A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller coupled to the transceiver, and configured to:
transmit, to a user equipment (UE) with reduced capabilities (RedCap), a first synchronization signal and physical broadcast channel (SS/PBCH) block which includes system information comprising configuration information for a first initial downlink (DL) bandwidth part (BWP),
transmit, to the UE with RedCap, a system information block 1 (SIB1) based on the configuration information, and
transmit, to the UE with RedCap, a physical downlink control channel (PDCCH) in a second initial DL BWP, the second initial DL BWP being based on the SIB1 of the first initial DL BWP,
wherein, in case that the PDCCH is monitored according to a Type1-PDCCH common search space (CSS) set of the second initial DL BWP, the second initial DL BWP does not include SS/PBCH blocks.
10 . The base station of claim 9 , wherein the controller is further configured to:
transmit, to the UE with RedCap, first information configuring a DL BWP for the RedCap, and
transmit, to the UE with RedCap, a second SS/PBCH block in the DL BWP,
wherein the second SS/PBCH block is a non-cell-defining (NCD) SS/PBCH block, and
wherein the first SS/PBCH block and the second SS/PBCH block with a same index have same quasi co-location (QCL) properties.
11 . The base station of claim 10 , wherein the controller is further configured to:
transmit, to the UE with RedCap, second information configuring the second SS/PBCH block,
wherein the second information includes a frequency of the second SS/PBCH block and a periodicity of the second SS/PBCH block, and
wherein the periodicity of the second SS/PBCH block is larger than a periodicity of the first SS/PBCH block.
12 . A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE) with reduced capabilities (RedCap), a first synchronization signal and physical broadcast channel (SS/PBCH) block which includes system information comprising configuration information for a first initial downlink (DL) bandwidth part (BWP);
transmitting, to the UE with RedCap, a system information block 1 (SIB1) based on the configuration information; and
transmitting, to the UE with RedCap, a physical downlink control channel (PDCCH) in a second initial DL BWP, the second BWP being based on the SIB1 of the first BWP,
wherein, in case that the PDCCH is monitored according to a Type1-PDCCH common search space (CSS) set of the second initial DL BWP, the second initial DL BWP does not include SS/PBCH blocks.
13 . The method of claim 12 , further comprising:
transmitting, to the UE with RedCap, first information configuring a DL BWP for the RedCap; and
transmitting, to the UE with RedCap, a second SS/PBCH block in the DL BWP,
wherein the second SS/PBCH block is a non-cell-defining (NCD) SS/PBCH block, and
wherein the first SS/PBCH block and the second SS/PBCH block with a same index have same quasi co-location (QCL) properties.
14 . The method of claim 13 , further comprising:
transmitting, to the UE with RedCap, second information configuring the second SS/PBCH block,
wherein the second information includes a frequency of the second SS/PBCH block and a periodicity of the second SS/PBCH block, and
wherein the periodicity of the second SS/PBCH block is larger than a periodicity of the first SS/PBCH block.
15 . The method of claim 13 , wherein the first SS/PBCH block and the second SS/PBCH block have a same value for at least one property, the at least one property including positions in burst of a SS/PBCH block, a physical cell identifier (PCI) of the SS/PBCH block, and a block power for the SS/PBCH block.