Method and apparatus for generating beam measurement information in a wireless communication system
The present disclosure is related to a 5 th generation (5G) or pre-5G communication system to be provided to support a higher data transmission rate since 4 th generation (4G) communication systems like long-term evolution (LTE). A method for generating beam measurement information of user equipment (UE) is provided. The method of UE includes receiving a first reference signal from a base station, requesting a transmission of a second reference signal when a result of measuring the first reference signal satisfies a predetermined condition, receiving the second reference signal, and generating a measurement result based on the second reference signal.
1. A method of a user equipment (UE), the method comprising:
receiving a first beamformed reference signal based on a first beam from a base station;
requesting a transmission of a second beamformed reference signal for beam selection if a result of measuring the first beamformed reference signal satisfies a predetermined condition;
starting a timer for prohibiting a transmission request for the second beamformed reference signal;
receiving the second beamformed reference signal; and
selecting a second beam based on a measurement result of the second beamformed reference signal.
2. The method of claim 1 , wherein the selecting of the second beam further comprises:
selecting the second beam having a best signal strength or quality based on a result of measuring the second beamformed reference signal.
3. The method of claim 1 , wherein the requesting of the transmission of the second beamformed reference signal further comprises:
identifying whether an uplink resource for requesting the transmission of the second beamformed reference signal is allocated;
requesting the transmission of the second beamformed reference signal through the uplink resource if the uplink resource is allocated; and
transmitting a scheduling request message to the base station if the uplink resource is not allocated.
4. The method of claim 3 , wherein the transmitting of the scheduling request message further comprises transmitting the scheduling request message if a parameter for the scheduling request message is configured.
5. The method of claim 1 , wherein the receiving of the second beamformed reference signal further comprises receiving scheduling information for reporting a measurement result for the first beamformed reference signal if the base station does not receive the transmission request of the second beamformed reference signal through the first beam.
6. A method of a base station, the method comprising:
transmitting a first beamformed reference signal to a user equipment (UE);
receiving a transmission request for a second beamformed reference signal for beam selection if a predetermined condition is satisfied, a timer for prohibiting the transmission request for the second beamformed reference signal being started;
transmitting the second beamformed reference signal to the UE; and
receiving, from the UE, a measurement result generated based on the second beamformed reference signal,
wherein a reception beam of the UE is changed from a first beam to a second beam based on the measurement result.
7. The method of claim 6 ,
wherein the measurement result comprises information on the second beam having a best signal strength or quality based on a result of measuring the second beamformed reference signal.
8. The method of claim 6 , wherein the receiving of the transmission request further comprises:
receiving a scheduling request message for the transmission request for the second beamformed reference signal from the UE; and
transmitting the second beamformed reference signal.
9. The method of claim 6 , wherein the transmitting of the second beamformed reference signal comprises:
identifying whether the transmission request for the second beamformed reference signal is received through a beam transmitting the first beamformed reference signal; and
transmitting the second beamformed reference signal if the transmission request is received through the beam.
10. The method of claim 9 , further comprising:
transmitting scheduling information for receiving a measurement result report for the first beamformed reference signal if the transmission request of the second beamformed reference signal is not received through the beam.
11. A user equipment (UE) comprising:
a transceiver; and
at least one processor configured to:
receive a first beamformed reference signal based on a first beam from a base station,
request a transmission of a second beamformed reference signal for beam selection if a result of measuring the first beamformed reference signal satisfies a predetermined condition,
start a timer for prohibiting a transmission request for the second beamformed reference signal,
receive the second beamformed reference signal, and
select a second beam based on a measurement result of the second beamformed reference signal.
12. The UE of claim 11 , wherein the at least one processor is further configured to select the second beam having a best signal strength or quality based on a result of measuring the second beamformed reference signal.
13. The UE of claim 11 , wherein the at least one processor is further configured to:
identify whether an uplink resource for requesting the transmission of the second beamformed reference signal is allocated,
request the transmission of the second beamformed reference signal through the uplink resource if the uplink resource is allocated, and
transmit a scheduling request message to the base station if the uplink resource is not allocated.
14. The UE of claim 13 , wherein the at least one processor is further configured to transmit a scheduling request message if a parameter for the scheduling request message is configured.
15. The UE of claim 11 , wherein the at least one processor is further configured to receive scheduling information for reporting a measurement result for the first beamformed reference signal if the base station does not receive the transmission request for the second beamformed reference signal through the first beam.
16. A base station comprising:
a transceiver; and
at least one processor configured to:
transmit a first beamformed reference signal to a user equipment (UE),
receive a transmission request for a second beamformed reference signal for beam selection if a predetermined condition is satisfied, a timer for prohibiting the transmission request for the second beamformed reference signal being started,
transmit the second beamformed reference signal to the UE, and
receive, from the UE, a measurement result generated based on the second beamformed reference signal,
wherein a reception beam of the UE is changed from a first beam to a second beam based on the measurement result.
17. The base station of claim 16 ,
wherein the measurement result includes information on the second beam having best signal strength or quality based on a result of measuring the second beamformed reference signal.
18. The base station of claim 16 , wherein the at least one processor is further configured to:
receive a scheduling request message for the transmission request for the second beamformed reference signal from the UE, and
transmit the second beamformed reference signal.
19. The base station of claim 16 , wherein the at least one processor is further configured to:
identify whether the transmission request for the second beamformed reference signal is received through a beam transmitting the first beamformed reference signal, and
transmit the second beamformed reference signal if the transmission request is received through the beam.
20. The base station of claim 19 , wherein the at least one processor is further configured to transmit scheduling information for receiving a measurement result report for the first beamformed reference signal if the transmission request for the second beamformed reference signal is not received through the beam.