Signaling power allocation parameters for uplink coordinated multipoint (CoMP)

#The present invention relates generally to wireless communications and wireless communications-related technology. More specifically, the present invention relates to systems and methods for signaling power allocation parameters for uplink coordinated multipoint (CoMP).

#Wireless communication devices have become smaller and more powerful in order to meet consumer needs and to improve portability and convenience. Consumers have become dependent upon wireless communication devices and have come to expect reliable service, expanded areas of coverage and increased functionality. A wireless communication system may provide communication for a number of cells, each of which may be serviced by a base station. A base station may be a fixed station that communicates with mobile stations.

#Various signal processing techniques may be used in wireless communication systems to improve both the efficiency and quality of wireless communications. For example, a wireless communication device may report uplink control information (UCI) to a base station. This uplink control information (UCI) may be used by the base station to select appropriate transmission modes, transmission schemes and modulation and coding schemes for downlink transmissions to the wireless communication device.

#FIG. 1 is a block diagram illustrating a wireless communication system that may utilize coordinated multipoint (CoMP);

#FIG. 2 is a block diagram illustrating a wireless communication system using uplink control information (UCI) multiplexing;

#FIG. 3 is a block diagram illustrating radio resource control (RRC) signaling between a serving eNode B and a user equipment (UE);

#A method for obtaining multiple path loss parameters by a user equipment (UE) is described. A radio resource control (RRC) signaling message is received from a serving eNode B. A first transmit power corresponding to a first reference signal is obtained from the RRC signaling message. A second transmit power corresponding to a second reference signal is obtained from the RRC signaling message. A first path loss parameter is calculated using the first transmit power. A second path loss parameter is calculated using the second transmit power.

#The first reference signal may be a first cell-specific reference signal. The second reference signal may be a second cell-specific reference signal. The second reference signal may instead be a channel state information reference signal (CSI-RS). The CSI-RS may be in a PDSCH configuration. The PDSCH configuration may include two CSI-RS configurations. The PDSCH configuration may include more than two CSI-RS configurations.

#A first received power of the first reference signal may be measured. The first received power may be used to calculate the first path loss parameter. A second received power of the second reference signal may also be measured. The second received power may be used to calculate the second path loss parameter. The second reference signal may be transmitted by an antenna port. The antenna port may include a transmission point. The first received power and the second received power may be reference signal received powers (RSRPs).