Beam failure recovery
Embodiments of the present disclosure provide method, device and computer readable medium for beam failure recovery. In example embodiments, a method implemented at a terminal device is provided. The method comprises determining a configuration for receiving Physical Downlink Control Channels (PDCCHs) from a network device, the network device communicating with the terminal device via first and second Transmission and Reception Points (TRPs), wherein the configuration indicates which one of the first and second TRPs are the PDCCHs to be received from. The method further comprises determining whether a beam failure occurs in at least one of the first and second TRPs. In addition, the method further comprises, in response to determining that a beam failure occurs in at least one of the first and second TRPs, performing beam failure recovery (BFR) for the first and second TRPs at least based on the configuration.
1. A method performed by the terminal device, the method comprising:
receiving, from a first transmission and reception point (TRP), a first Physical Downlink Control Channel (PDCCH) using a resource of a first Control Resource Set (CORESET); and
receiving, from a second TRP, a second PDCCH using a resource of a second CORESET,
wherein the first CORESET and the second CORESET are configured for a Bandwidth part (BWP) of a cell,
wherein both of the first TRP and the second TRP corresponds to the cell,
wherein a first set of reference signal (RS) resource configuration indexes corresponds to the first CORESET,
wherein a second set of RS resource configuration indexes corresponds to the second CORESET, and
wherein the method further comprises transmitting, if a beam failure is detected based on a comparison between a threshold and radio link quality for a RS resource configuration in the first set and the second set, a RS resource configuration index corresponding to a new beam candidate from a third set of RS resource configuration indexes for beam candidates, the third set being provided for the BWP of the cell.
2. The method according to claim 1 , wherein
the beam failure is detected when the radio link quality for all corresponding RS resource configurations in the first set and the second set is below a predetermined threshold.
3. The method according to claim 1 , wherein
the first CORESET is configured for the first TRP, and
the second CORESET is configured for the second TRP.
4. A terminal device comprising:
a receiver configured to receive, from a first transmission and reception point (TRP), a first Physical Downlink Control Channel (PDCCH) using a resource of a first Control Resource Set (CORESET) and receive, from a second TRP, a second PDCCH using a resource of a second CORESET,
wherein the first CORESET and the second CORESET are configured for a Bandwidth part (BWP) of a cell,
wherein both of the first TRP and the second TRP corresponds to the cell,
wherein a first set of reference signal (RS) resource configuration indexes corresponds to the first CORESET,
wherein a second set of RS resource configuration indexes corresponds to the second CORESET, and
wherein the terminal device further comprises a transmitter configured to transmit, if a beam failure is detected based on a comparison between a threshold and radio link quality for a RS resource configuration in the first set and the second set, a RS resource configuration index corresponding to a new beam candidate from a third set of RS resource configuration indexes for beam candidates, the third set being provided for the BWP of the cell.