Method and apparatus for uplink beam management in next generation wireless systems
A method of a user equipment (UE) for beam management in a wireless communication system is provided. The method comprises receiving, from a base station (BS), a downlink message comprising configuration information that includes a direction of Tx beam and a pattern of the beam sweeping of a set of transmit (Tx) beams for sounding reference signals (SRSs); determining information comprising the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams; and transmitting, to the BS, an uplink message including a number of the SRSs for the beam management of the set of Tx beams in accordance with the configuration information.
1. A user equipment (UE) for beam management in a wireless communication system, the UE comprising:
a transceiver configured to receive, from a base station (BS), a downlink message comprising configuration information that includes a direction of transmit (Tx) beam and a pattern of a beam sweeping of a set of Tx beams for sounding reference signals (SRSs); and
at least one processor configured to determine information comprising the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams for the SRSs,
wherein the transceiver is further configured to transmit, to the BS, an uplink message including a number of the SRSs for the beam management with the set of Tx beams in accordance with the configuration information.
2. The UE of claim 1 , wherein the at least one processor is further configured to determine SRS resources in a set of SRS resources associated with the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams.
3. The UE of claim 2 , wherein each SRS resource in the set of SRS resources comprises a Tx power with a same transmit power level for an uplink beam management.
4. The UE of claim 3 , wherein the Tx power is calculated for each SRS in the set of SRS resources as given by P S n =min{P CMAX,C ,10 log(M SRS,S n )+P o,SRS +α SRS,C ×PL+f SRS } where P CMAX,C is a maximal UE transmit power, M SRS,S n is an SRS bandwidth of the SRS resource, P o,SRS is configured for the set of SRS resources, α SRS,C is configured for the set of SRS resources, a FL is a downlink path loss calculated for the set of SRS resources, and f SRS is a carrier frequency of each SRS.
5. The UE of claim 1 , wherein the transceiver is further configured to transmit, to the BS, a transmission of a number of SRS resources for the beam management.
6. The UE of claim 5 , wherein the transmission of the number of SRS resources is performed at a same Tx power level.
7. The UE of claim 1 , wherein each of the set of Tx beams comprises either the pattern of the beam sweeping with multiple different Tx beam directions or the pattern of the beam sweeping with a same Tx beam direction.
8. A base station (BS) for beam management in a wireless communication system, the BS comprising:
at least one processor configured to determine information comprising a direction of a transmit (Tx) beam and a pattern of a beam sweeping of a set of Tx beams for sounding reference signals (SRSs); and
a transceiver configured to:
transmit, to a user equipment (UE), a downlink message comprising configuration information that includes the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams for the SRSs; and
receive, from the UE, an uplink message including a number of the SRSs for the beam management of the set of Tx beams in accordance with the configuration information.
9. The BS of claim 8 , wherein the at least one processor is further configured to determine SRS resources in a set of SRS resources associated with the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams.
10. The BS of claim 9 , wherein each SRS resource in the set of SRS resources comprises a Tx power with a same transmit power level for an uplink beam management.
11. The BS of claim 10 , wherein the Tx power is calculated for each SRS in the set of SRS resources as given by P S n =min{P CMAX,C ,10 log(M SRS,S n )+P o,SRS +α SRS,C ×PL+f SRS } where P CMAX,C is a maximal UE transmit power, M SRS,S n is an SRS bandwidth of the SRS resource, P o,SRS is configured for the set of SRS resources, α SRS,C is configured for the set of SRS resources, a FL is a downlink path loss calculated for the set of SRS resources, and f SRS is a carrier frequency of each SRS.
12. The BS of claim 8 , wherein the transceiver is further configured to receive, from the UE, a transmission of a number of SRS resources for the beam management.
13. The BS of claim 8 , wherein each of the set of Tx beams comprises either the pattern of the beam sweeping with multiple different Tx beam directions or the pattern of the beam sweeping with a same Tx beam direction.
14. A method of a user equipment (UE) for beam management in a wireless communication system, the method comprising:
receiving, from a base station (BS), a downlink message comprising configuration information that includes a direction of transmit (Tx) beam and a pattern of a beam sweeping of a set of Tx beams for sounding reference signals (SRSs);
determining information comprising the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams for the SRSs; and
transmitting, to the BS, an uplink message including a number of the SRSs for the beam management of the set of Tx beams in accordance with the configuration information.
15. The method of claim 14 , further comprising determining SRS resources in a set of SRS resources associated with the direction of the Tx beam and the pattern of the beam sweeping of the set of Tx beams.
16. The method of claim 15 , wherein each SRS resource in the set of SRS resources comprises a Tx power with a same transmit power level for an uplink beam management.
17. The method of claim 16 , wherein the Tx power is calculated for each SRS in the set of SRS resources as given by P S n =min{P CMAX,C ,10 log(M SRS,S n )+P o,SRS +α SRS,C ×PL+f SRS } where P CMAX,C is a maximal UE transmit power, M SRS,S n is an SRS bandwidth of the SRS resource, P o,SRS is configured for the set of SRS resources, α SRS,C is configured for the set of SRS resources, a FL is a downlink path loss calculated for the set of SRS resources, and f SRS is a carrier frequency of each SRS.
18. The method of claim 14 , further comprising transmitting, to the BS, a transmission of a number of SRS resources for the beam management.
19. The method of claim 18 , wherein the transmission of the number of SRS resources is performed at a same Tx power level.
20. The method of claim 14 , wherein each of the set of Tx beams comprises either the pattern of the beam sweeping with multiple different Tx beam directions or the pattern of the beam sweeping with a same Tx beam direction.