Patent ID: 8839362

Claim:
A method, on a first UE, for managing transmit power in device-to-device communication and cellular communication, the method comprising: determining a first configured maximum output power, wherein the first configured maximum output power is based on a configuration of a first cell; determining a second configured maximum output power, wherein the second configured maximum output power is based on the configuration of the first cell and a configuration of a second cell; determining whether a total transmit power would exceed the second configured maximum output power; and if it is determined that the total transmit power would exceed the second configured maximum output power, performing steps comprising: determining a cellular transmit power based on one or more of a plurality of factors, the plurality comprising: the first configured maximum output power, the second configured maximum output power, and the relative priority of service of device-to-device communication and cellular communication; transmitting a cellular signal on a carrier of the first cell at the determined cellular transmit power; determining a device-to-device transmit power based on one or more of a plurality of factors, the plurality comprising: the first configured maximum output power, the second configured maximum output power, and the relative priority of service of device-to-device communication and cellular communication; and transmitting a device-to-device signal to a second UE on a carrier of the second cell at the determined device-to-device transmit power; wherein: w 2 ( i )· {circumflex over (P)} D2D ( i )+ w 3 ( i )· {circumflex over (P)} PUSCH,k ( i )+ w 4 ( i )· {circumflex over (P)} PUCCH ( i )≦ {circumflex over (P)} CMAX ( i ); {circumflex over (P)} D2D (i) is the linear value of power setting of device-to-device signal transmission from the first UE to the second UE without power scaling; {circumflex over (P)} PUSCH,k (i) is the linear value of power setting of cellular uplink data channel signal transmission from the first UE to a primary cell k without power scaling; {circumflex over (P)} PUCCH (i) is the linear value of power setting of cellular uplink control channel signal transmission from the first UE without power scaling; {circumflex over (P)} CMAX,k (i) is the linear value of the first configured maximum output power level; {circumflex over (P)} CMAX (i) is the linear value of the second configured maximum output power level; {circumflex over (P)} PUSCH,k ( i )+ {circumflex over (P)} PUCCH ( i )≦ {circumflex over (P)}CMAX,k ( i ); w 2 (i), w 3 (i) and w 4 (i) are power scaling factors; and the determined device-to-device transmit power and the determined cellular transmit power are: {tilde over (P)} D2D ( i )= w 2 ( i )· {circumflex over (P)} D2D ( i ), {tilde over (P)} PUSCH,k ( i )= w 3 ( i )· {circumflex over (P)} PUSCH,k ( i ), {tilde over (P)} PUCCH ( i )= w 4 ( i )· {circumflex over (P)} PUCCH ( i ), and 0≦ w 2 ( i ), w 3 ( i ), w 4 ( i )≦1.