Method and apparatus for operation mode on unlicensed spectrum
Methods and apparatuses for operation modes on unlicensed spectrum in a wireless communication system including a carrier operating with shared spectrum channel access. A method of operating a UE includes receiving a set of higher layer parameters from a BS over the carrier and determining, from the set of higher layer parameters, a first operation mode for the BS. The method further includes determining, from the set of higher layer parameters, a second operation mode for the UE and transmitting to the BS based on the second operation mode. The first operation mode and the second operation mode include information on whether channel sensing is required before transmission on the carrier operating with shared spectrum channel access.
1 . A base station (BS) in a wireless communication system including a channel operating with shared spectrum channel access, the BS comprising:
a processor configured to:
determine an operation mode for the BS and a user equipment (UE) served by the BS;
determine, based on information for the operation mode, whether a channel sensing is required in a channel access procedure before a transmission on the channel operating with shared spectrum channel access; and
determine, when the channel sensing is required, a configuration of a transmission window for a discovery burst and a quasi-co-location (QCL) parameter for synchronization signals and physical broadcast channel (SS/PBCH) blocks; and
a transceiver operably coupled to the processor, the transceiver configured to:
perform the channel sensing in the channel access procedure before a transmission to the UE when the operation mode includes information that the channel sensing is required;
transmit to the UE over the channel after sensing the channel to be idle; and
transmit, to the UE via higher layer parameters, information indicating the operation mode, the configuration of the transmission window for the discovery burst, and the QCL parameter for the SS/PBCH blocks,
wherein the higher layer parameters are included in at least one of a master information block (MIB), a system information block 1 (SIB1), and a dedicated radio resource control (RRC) parameter, and
wherein, when the higher layer parameters are included in both of the SIB1 and the dedicated RRC parameter, a value of the operation mode in the dedicated RRC parameter overrides a value of the operation mode in the SIB1.
2 . The BS of claim 1 , wherein:
the operation mode is indicated as a bitmap,
each bit in the bitmap corresponds to a beam, and
a bitwidth in the bitmap corresponds to a number of beams.
3 . The BS of claim 2 , wherein the beam is associated with a transmission configuration indicator (TCI) state configured by the BS.
4 . The BS of claim 1 , wherein for UEs using a same beam, the information on whether the channel sensing is required before the transmission on the channel operating with shared spectrum channel access included in the operation mode is the same.
5 . A user equipment (UE) in a wireless communication system including a channel operating with shared spectrum channel access, the UE comprising:
a transceiver configured to receive, from a base station (BS), higher layer parameters, the higher layer parameters including information indicating a quasi-co-location (QCL) parameter for synchronization signals and physical broadcast channel (SS/PBCH) blocks; and
a processor operably coupled to the transceiver, the processor configured to:
determine, from the higher layer parameters, an operation mode for the BS and the UE,
determine, based on information for the operation mode, whether a channel sensing is required in a channel access procedure before a transmission on the channel operating with shared spectrum channel access, and
determine, when the channel sensing is required, a configuration of a transmission window for a discovery burst based on the higher layer parameters and the QCL parameter for the SS/PBCH blocks, and
wherein the transceiver is further configured to:
perform the channel sensing in the channel access procedure before a transmission to the BS when the operation mode includes information that the channel sensing is required; and
transmit to the BS over the channel after sensing the channel to be idle,
wherein the higher layer parameters are included in at least one of a master information block (MIB), a system information block 1 (SIB1), and a dedicated radio resource control (RRC) parameter, and
wherein, when the higher layer parameters are included in both of the SIB1 and the dedicated RRC parameter, a value of the operation mode in the dedicated RRC parameter overrides a value of the operation mode in the SIB1.
6 . The UE of claim 5 , wherein:
the operation mode is determined from a bitmap,
each bit in the bitmap corresponds to a beam, and
a bitwidth in the bitmap corresponds to a number of beams.
7 . The UE of claim 6 , wherein the beam is associated with a transmission configuration indicator (TCI) state configured by the BS.
8 . The UE of claim 5 , wherein for UEs using a same beam, the information on whether the channel sensing is required before the transmission on the channel operating with shared spectrum channel access included in the operation mode is the same.
9 . A method of operating a user equipment (UE) in a wireless communication system including a channel operating with shared spectrum channel access, the method comprising:
receiving, from a base station (BS), higher layer parameters, the higher layer parameters including information indicating a quasi-co-location (QCL) parameter for synchronization signals and physical broadcast channel (SS/PBCH) blocks;
determining, from the higher layer parameters, an operation mode for the BS and the UE;
determining, based on information for the operation mode, whether a channel sensing is required in a channel access procedure before a transmission on the channel operating with shared spectrum channel access;
determining, when the channel sensing is required, a configuration of a transmission window for a discovery burst based on the higher layer parameters and the QCL parameter for the SS/PBCH blocks;
performing a channel sensing in a channel access procedure before a transmission to the BS based on the operation mode including information that the channel sensing is required; and
transmitting to the BS over the channel after sensing the channel to be idle,
wherein the higher layer parameters are included in at least one of a master information block (MIB), a system information block 1 (SIB1), and a dedicated radio resource control (RRC) parameter, and
wherein, when the higher layer parameters are included in both of the SIB1 and the dedicated RRC parameter, a value of the operation mode in the dedicated RRC parameter overrides a value of the operation mode in the SIB1.
10 . The method of claim 9 , wherein:
the operation mode is determined from a bitmap,
each bit in the bitmap corresponds to a beam, and
a bitwidth in the bitmap corresponds to a number of beams.
11 . The method of claim 10 , wherein the beam is associated with a transmission configuration indicator (TCI) state configured by the BS.
12 . The method of claim 9 , wherein for UEs using a same beam, the information on whether the channel sensing is required before the transmission on the channel operating with shared spectrum channel access included in the operation mode is the same.