Methods for transmitting uplink signal and downlink signal, UE and base station
Embodiments of the present disclosure provide methods for transmitting an uplink signal and a downlink signal. A method for transmitting an uplink signal comprises detecting whether there is a beam failure; if there is a beam failure, determining at least one of whether there is a candidate downlink transmission beam(s) or candidate downlink transmission beam information; and transmitting a beam failure recovery request message to a base station, the beam failure recovery request message being used for informing the base station of at least one of whether there is a candidate downlink transmission beam(s) or candidate downlink transmission beam information. A method for transmitting a downlink signal comprises detecting a beam failure recovery request message, determining at least one of whether there is a candidate downlink transmission beam(s) or candidate downlink transmission beam information in the UE; and transmitting a feedback message corresponding to the beam failure recovery request message.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, first information including information on at least one reference signal to be used for identifying one or more candidate beams associated with a beam failure recovery request and second information on a search space associated with a beam failure recovery response;
selecting a reference signal based on the first information;
transmitting to the base station, a random access preamble for the beam failure recovery request based on the selected reference signal;
identifying the search space for monitoring a downlink control channel based on the second information, the search space being used for the beam failure recovery response;
monitoring the downlink control channel based on the identified search space, the downlink control channel being identified by a cell radio network temporary identifier (C-RNTI); and
receiving, from the base station, the beam failure recovery response on the downlink control channel,
wherein the random access preamble corresponds to the selected reference signal.
2. The method of claim 1 , selecting of the reference signal further comprising:
selecting the reference signal from among the at least one reference signal based on a reference signal receiving power (RSRP) associated with the at least one reference signal.
3. The method of claim 1 , wherein each of the at least one reference signal is one of synchronous signal (SS) block or channel state information-reference signal (CSI-RS).
4. A method performed by a base station in a wireless communication system, the method comprising:
transmitting first information on at least one reference signal to be used for identifying one or more candidate beams associated with a beam failure recovery request and second information on a search space associated with a beam failure recovery response to a terminal;
receiving, from the terminal a random access preamble for the beam failure recovery request based on a reference signal among the at least one reference signal, identified by the first information; and
transmitting the beam failure recovery response on a downlink control channel,
wherein the downlink control channel is monitored for the beam failure recovery response based on the search space identified by the second information, the downlink control channel being identified by a cell radio network temporary identifier (C-RNTI), and the random access preamble corresponds to the reference signal.
5. The method of claim 4 , wherein the reference signal is selected from among the at least one reference signal based on a reference signal receiving power (RSRP) associated with the at least one reference signal.
6. The method of claim 4 , wherein each of the at least one reference signal is one of synchronous signal (SS) block or channel state information-reference signal (CSI-RS).
7. A terminal for receiving a beam failure recovery response, the terminal comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
receive, from a base station, first information including information on at least one reference signal to be used for identifying one or more candidate beams associated with a beam failure recovery request and second information on a search space associated with a beam failure recovery response,
select a reference signal based on the first information,
transmit, to the base station, a random access preamble for the beam failure recovery request based on the selected reference signal,
identify the search space, for monitoring a downlink control channel based on the second information, the search space being used for the beam failure recovery response,
monitor the downlink control channel based on the identified search space, the downlink control channel being identified by a cell radio network temporary identifier (C-RNTI), and
receive, from the base station, the beam failure recovery response on the downlink control channel,
wherein the random access preamble corresponds to the selected reference signal.
8. The terminal of claim 7 , wherein the processor is further configured to selecting the reference signal from among the at least one reference signal based on a reference signal receiving power (RSRP) associated with the at least one reference signal.
9. The terminal of claim 7 , wherein each of the at least one reference signal is one of synchronous signal (SS) block or channel state information-reference signal (CSI-RS).
10. A base station for transmitting a beam failure recovery response, the base station comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
transmit first information on at least one reference signal to be used for identifying one or more candidate beams associated with a beam failure recovery request and second information on a search space associated with a beam failure recovery response to a terminal,
receive, from the terminal a random access preamble for the beam failure recovery request based on a reference signal among the at least one reference signal, identified by the first information, and
transmit the beam failure recovery response on a downlink control channel,
wherein the downlink control channel is monitored for the beam failure recovery response based on the search space identified by the second information, the downlink control channel being identified by a cell radio network temporary identifier (C-RNTI) and the random access preamble corresponds to the reference signal.
11. The base station of claim 10 , wherein the reference signal is selected from among the at least one reference signal based on a reference signal receiving power (RSRP) associated with the at least one reference signal.
12. The base station of claim 10 , wherein each of the at least one reference signal is one of synchronous signal (SS) block or channel state information-reference signal (CSI-RS).