Method for transmitting power headroom report, and apparatus for same
Disclosed are a method for transmitting a power headroom report (PHR) and a terminal apparatus for same. The method for transmitting a PHR from a terminal in a network, which includes a base station and at least one cooperative node performing cooperative communication with the base station, includes a step of determining a sounding reference symbol (SRS) transmission power for transmitting SRSs in a specific serving cell, wherein the determined SRS transmission power is a value determined for the transmission of the SRSs to a plurality of nodes including a first node corresponding to the base station and the at least one cooperative node.
1. A method of transmitting a power headroom report (PHR) by a user equipment (UE) in a network in which a base station and one or more cooperative nodes for performing cooperative communication with the base station exist, the method comprising:
determining a sounding reference signal (SRS) transmit power for transmitting a SRS in a specific serving cell; and
determining a PHR value for the SRS by subtracting the determined SRS transmit power from a maximum transmit power value configured for the UE for the specific serving cell,
wherein the determined SRS transmit power is a value for transmission to a plurality of nodes among a first node corresponding to the base station and one or more cooperative nodes.
2. The method according to claim 1 , wherein the determined SRS transmit power is determined based on an offset according to a trigger type of the SRS and a transmission bandwidth of the SRS as dedicated SRS in the specific serving cell.
3. The method according to claim 2 , wherein the determined SRS transmission power is determined based on at least one of a SRS pathloss compensation factor, a SRS pathloss estimate, a value indicating a SRS power adjustment state and a value expressed by a sum of a cell-specific nominal component and a UE-specific nominal component for the SRS, for the specific serving cell.
4. The method according to claim 1 , further comprising:
configuring PHR information including the PHR value for the SRS based on the determined SRS transmit power; and
transmitting the configured PHR information to at least one node of the plurality of nodes,
wherein the plurality of nodes includes a cooperative node configured in the UE or an activated cooperative node or includes a transmission point set or reception point set configured in the UE, and
wherein the PHR information is configured for each of the plurality of nodes.
5. The method according to claim 1 , wherein the cooperative node corresponds to an antenna, a remote radio head (RRH), a pico-cell base station, a micro-cell base station, a transmission point, a reception point, a transmission point set or a reception point set.
6. The method according to claim 4 , wherein the configured PHR information includes PHR information configured according to predetermined order of cooperative nodes or includes a cooperative node index and PHR information corresponding to the cooperative node index.
7. The method according to claim 4 , wherein the configured PHR information is transmitted to all of the plurality of nodes or all of the cooperative nodes.
8. A user equipment (UE) for transmitting a power headroom report (PHR) in a network in which a base station and one or more cooperative nodes for performing cooperative communication with the base station exist, the UE comprising:
a transmitter; and
a processor connected to the transmitter and configured to:
determine a sounding reference signal (SRS) transmit power for transmitting a SRS in a specific serving cell; and
determine a PHR value for the SRS by subtracting the determined SRS transmit power from a maximum transmit power value configured for the UE for the specific serving cell,
wherein the determined SRS transmit power is a value for transmission to a plurality of nodes among a first node corresponding to the base station and a plurality of nodes among one or more cooperative nodes.
9. The UE according to claim 8 , wherein the processor is further configured to determine the SRS transmit power based on an offset according to a trigger type of the SRS and a transmission bandwidth of the SRS as dedicated SRS in the specific serving cell.
10. The UE according to claim 9 , wherein the processor is further configured to determine the SRS transmission power based on at least one of a SRS pathloss compensation factor, a SRS pathloss estimate, a value indicating a SRS power adjustment state and a value expressed by a sum of a cell-specific nominal component and a UE-specific nominal component for the SRS, for the specific serving cell.
11. The UE according to claim 8 , wherein:
the processor is further configured to configure PHR information including the PHR value for SRS based on the determined SRS transmit power,
the transmitter is configured to transmit the configured PHR information to at least one node of the plurality of nodes,
wherein the plurality of nodes includes a cooperative node configured in the UE or an activated cooperative node or includes a transmission point set or reception point set configured in the UE, and
wherein the PHR information is configured for each of the plurality of nodes.
12. The UE according to claim 8 , wherein the cooperative node corresponds to an antenna, a remote radio head (RRH), a pico-cell base station, a micro-cell base station, a transmission point, a reception point, a transmission point set or a reception point set.
13. The UE according to claim 11 , wherein the configured PHR information includes PHR information configured according to predetermined order of cooperative nodes or includes a cooperative node index and PHR information corresponding to the cooperative node index.
14. The UE according to claim 11 , wherein the transmitter is further configured to transmit the configured PHR information to all of the plurality of nodes or all of the cooperative nodes.