A method and an apparatus for efficiently reporting user equipment (UE) are provided. A method of transmitting Power Headroom Report (PHR) of UE in a mobile communication system, includes configuring an evolved PHR including an indicator with respect of a variation factor of maximum transmission power of the UE, and transmitting the evolved PHR to an eNB. An eNB may know maximum transmission power of an UE and a variation factor thereof to enable efficient scheduling.

A method of configuring downlink timings and transmitting a random access response message is provided for a random access procedure in a Long Term Evolution (LTE) system supporting carrier aggregation. The method for adjusting timing of a terminal in a wireless communication system supporting carrier aggregation of at least one carrier includes transmitting a Random Access Preamble to a base station, and receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied.

A cellular communication device is configured to use Non-Standalone Architecture (NSA) dual connectivity for communicating with a cellular communication network, using simultaneous 4.sup.th-Generation (4G) Long-Term Evolution (LTE) and 5.sup.th-Generation (5G) New Radio (NR) radio access technologies. When implementing NSA dual connectivity, the device may receive separate transmit power control commands for LTE uplink transmissions and NR uplink transmissions, respectively. In order to keep total transmitted power of the device below a regulatory maximum transmit power, LTE transmit power is limited to a value that is less than regulatory maximum transmit power, thereby reserving at least a reserved transmit power for NR transmissions. This allows NR acknowledgements to be sent from the device to avoid NR downlink failure.

A method and an apparatus for efficiently reporting user equipment (UE) are provided. A method of transmitting Power Headroom Report (PHR) of UE in a mobile communication system, includes configuring an evolved PHR including an indicator with respect of a variation factor of maximum transmission power of the UE, and transmitting the evolved PHR to an eNB. An eNB may know maximum transmission power of an UE and a variation factor thereof to enable efficient scheduling.

A method and an apparatus for efficiently reporting user equipment (UE) are provided. A method of transmitting Power Headroom Report (PHR) of UE in a mobile communication system, includes configuring an evolved PHR including an indicator with respect of a variation factor of maximum transmission power of the UE, and transmitting the evolved PHR to an eNB. An eNB may know maximum transmission power of an UE and a variation factor thereof to enable efficient scheduling.

A cellular communication device is configured to use Non-Standalone Architecture (NSA) dual connectivity for communicating with a cellular communication network, using simultaneous 4.sup.th-Generation (4G) Long-Term Evolution (LTE) and 5.sup.th-Generation (5G) New Radio (NR) radio access technologies. When implementing NSA dual connectivity, the device may receive separate transmit power control commands for LTE uplink transmissions and NR uplink transmissions, respectively. In order to keep total transmitted power of the device below a regulatory maximum transmit power, LTE transmit power is limited to a value that is less than regulatory maximum transmit power, thereby reserving at least a reserved transmit power for NR transmissions. This allows NR acknowledgements to be sent from the device to avoid NR downlink failure.

Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may receive one or more downlink control information (DCI) transmissions including a plurality of transmit power control (TPC) commands. The plurality of TPC commands may relate to an uplink channel transmit power for a plurality of uplink beam-pairs. The wireless communication device may determine the uplink channel transmit power for the plurality of uplink beam-pairs based at least in part on the plurality of TPC commands. Numerous other aspects are provided.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. An improved method and an apparatus for reporting Power Headroom (PH) of a UE are provided. The Power Headroom Report (PHR) method of the present invention includes determining whether to trigger PHR based on a change of Power Management Maximum Power Reduction (P-MPR) between two time points, generating, if PHR is determined to be triggered, Power Headroom, and reporting the Power Headroom information to a base station.

Certain aspects of the present disclosure provide techniques for scaling transmission power across transmit chains for physical uplink shared channel (PUSCH) transmissions. In some cases, a UE may determine a transmit power budget, receiving signaling indicating how to allocate the transmit power budget across transmit chains for a physical uplink shared channel (PUSCH) transmission, allocate the transmit power budget across transmit chains for a physical uplink shared channel (PUSCH) transmission, and transmitting the PUSCH using the transmit chains according to the determined transmit power allocation.

In a communication system in which a base station device (1) and a terminal device (2) communicate, there is a provided a terminal device, a method, and an integrated circuit enabling the base station device (1) and the terminal device (2) to conduct transmit power control efficiently. Provided is a terminal device that communicates with a base station device, including a transmission unit that transmits an uplink signal based on a first uplink power control in a case of the information related to the first configuration being configured, and the information related to the second configuration not being configured, and transmits an uplink signal based on a second uplink power control in a case of the information related to the first configuration and the information related to the second configuration both being configured.