Beam management and beam failure recovery in new radio-unlicensed at 60 Gigahertz
Disclosed is an electronic device including at least one processor, and at least one memory operatively connected with the at least one processor, wherein the at least one memory stores instructions, which when executed, instruct the at least one processor to receive, on a control channel, a control channel message, receive a set of reference signals (RSs) in which each RS corresponds to a beam direction, decode the control channel message to obtain a list of transmission state indicator (TCI) state information for one or more slots, wherein each TCI state information comprises a channel occupancy time (COT) duration indicator for each of the slots, and determine, based on the TCI state information list, whether each RS of the set is valid.
1. An electronic device, comprising:
at least one processor; and
at least one memory operatively connected with the at least one processor, the at least one memory storing instructions, which when executed, instruct the at least one processor to:
receive, on a control channel, a control channel message;
receive a set of reference signals (RSs) in which each RS corresponds to a beam direction corresponding to a transmission state indicator (TCI) state;
decode the control channel message to obtain a list of beam specific channel occupancy time (COT) information for one or more slots, wherein each beam specific COT information comprises COT duration indicator for each of the slots;
determine, based on the beam specific COT information list, whether each RS of the set is valid; and
receive, in the beam specific COT information, scheduling information related to RS transmissions corresponding to each beam corresponding to the TCI state,
wherein validity of one or more RSs of the set of RSs is based on whether a duration of the set of RSs exceeds one or more corresponding slot durations provided by the COT duration indicator.
2. The electronic device of claim 1 ,
wherein the control message is a group common downlink control message, and
wherein, it is determined that each RS of the set is valid when the RS is transmitted after a successful listen before talk (LBT) channel access is performed and the RS is transmitted within the duration provided by the COT duration indicator for each of the slots.
3. The electronic device of claim 1 ,
wherein the beam specific COT information indicates search space group switching and an available resource block set at each slot within the COT per the beam direction or the TCI state.
4. The electronic device of claim 1 ,
wherein a starting time position and duration of a set of LBT-free RS transmissions to the electronic device are indicated by the scheduling information or are pre-configured and periodically repeated.
5. The electronic device of claim 4 ,
wherein the set of LBT-free RS transmissions is indicated as existing when the reference signals corresponding to the TCI state are outside the COT duration and within the indicated duration of the set of RS transmissions that are free of the LBT.
6. The electronic device of claim 5 ,
wherein the electronic device does not consider the received set of the reference signals for beam quality measurement corresponding to the beams or TCI states when the beam specific COT information indicates these set of reference signals are not within the indicated COT durations for those TCI states or those beam directions.
7. A system, comprising:
a device configured to:
receive a set of reference signals (RSs) and a control channel message, the control channel message notifying a slot format, a channel occupancy time (COT) duration, an available resource block set, and search space group switching, per a beam direction or a transmission state indicator (TCI) state, for signal transmission and reception by the device,
receive the set of RSs in which each RS corresponds to a beam direction,
decode the control channel message to obtain a list of beam specific COT information for one or more slots, each beam specific COT information including a channel occupancy time (COT) duration indicator for each of the slots,
determine, based on the beam-specific COT information list, whether each RS of the set is valid, and
receive, in the beam specific COT information, scheduling information related to RS transmissions corresponding to each beam corresponding to the TCI state,
wherein validity of one or more RSs of the set of RSs is based on whether a duration of the set of RSs exceeds one or more corresponding slot durations provided by the COT duration indicator.
8. The system of claim 7 ,
wherein the control message is a group common downlink control message, and
wherein, it is determined that each RS of the set is valid when the RS is transmitted after a successful listen before talk (LBT) channel access is performed and the RS is transmitted within the duration provided by the COT duration indicator for each of the slots.
9. The system of claim 7 ,
wherein the TCI information indicates search space group switching and available resource blocks at each slot within the COT per the beam direction or the TCI state.
10. The system of claim 7 ,
wherein the system receives, in the beam specific COT duration, reference signals corresponding to that beam or TCI state.
11. The system of claim 10 ,
wherein the received set of the reference signals for beam quality measurement corresponding to the beams or TCI states is not considered when the beam specific COT information indicates these set of reference signals are not within the indicated COT durations for those TCI states or those beam directions.