Provided is a terminal which can suitably transmit an uplink signal. In a terminal (100), a PC parameter control unit (104) sets a first power control parameter corresponding to a first service, when a prescribed condition relating to a control channel used for transmission of uplink signal allocation is met, and sets a second power control parameter corresponding to a second service, when the prescribed condition is not met. A transmission unit (109) transmits the uplink signal by using transmission power calculated by using the first power control parameter or the second power control parameter.

A method and an apparatus are provided for HARQ-ACK feedback information transmission in a traffic adaptive TDD system. The method includes receiving, on a physical downlink control channel (PDCCH), downlink control information for scheduling a physical downlink shared channel (PDSCH), wherein the downlink control information includes a resource indicator indicating at least one physical uplink control channel (PUCCH) resource for transmitting the HARQ-ACK information and power control information for controlling transmission power of a UE; determining the transmission power of the UE based on the power control information; and transmitting the HARQ-ACK information based on the at least one PUCCH resource and the determined transmission power.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first downlink control information corresponding to a first group of downlink transmissions and second downlink control information corresponding to a second group of downlink transmissions. The UE may calculate a number of information bits for a feedback message including first feedback for one or more downlink transmissions of the first group and second feedback for one or more downlink transmissions of the second group. The number of information bits may include first information bits of the first feedback and second information bits of the second feedback. The UE may identify a transmission power for the feedback message based on the calculated number of information bits. The UE may transmit the feedback message including the first feedback and the second feedback using the identified transmission power.

In a first embodiment, a method is disclosed, comprising: determining when and where to create a 2G/Narrowband-Internet of Things (NB-IOT) carrier at a 2G base station; starting up the 2G/NB-IOT carrier; creating an interference-free zone for a co-located 4G or 5G carrier co-located with the 2G base station; turning off the 2G/NB-IOT carrier; and reverting the interference-free zone. The method may further comprise embedding one or more 2G/NB-IOT carriers in a guard band of 4G/5G. The method may further comprise transmitting a 2G/NB-IOT carrier from a co-located base station. The method may further comprise using Self-organizing Network (SON) information to determine when a 2G/NB-IOT carrier should be started or shut down. The method may further comprise shutting down a 2G/NB-IOT carrier after use. The method may further comprise creating interference free zones in required regions of the spectrum. The method may further comprise creating interference free zones using a Relative Narrowband Transmit Power (RNTP) Information Element of a X2AP protocol. The method may further comprise creating interference free zones across multiple neighboring eNBs.

Provided is a terminal which can suitably transmit an uplink signal. In a terminal (100), a PC parameter control unit (104) sets a first power control parameter corresponding to a first service, when a prescribed condition relating to a control channel used for transmission of uplink signal allocation is met, and sets a second power control parameter corresponding to a second service, when the prescribed condition is not met. A transmission unit (109) transmits the uplink signal by using transmission power calculated by using the first power control parameter or the second power control parameter.

A radio system (110) comprising a first (120) and a second (130) radio unit which comprise a transmitter (122, 132) and a receiver (121, 131). The first radio unit (120) communicates with a first external radio unit (101) and the second radio unit (140) with a second external radio unit (102). Both transmitters (122, 132) are arranged to vary their output power level in response to a request from the external radio unit with which they are arranged to communicate. Both of the transmitters also vary their output power level in response to a variation in the transmitter output power level of the other radio unit.

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.

Systems and methods are disclosed herein for fast uplink power control. In some embodiments, a method performed by a wireless device for fast uplink power control comprises receiving a transmit power control command from a network node and determining one of two or more predefined transmit power control mapping tables to be used by the wireless device to interpret the transmit power control command. The method further comprises determining a power adjustment value based on the transmit power control command received from the network node using the one of the two or more predefined transmit power control mapping tables and adjusting a transmit power of the wireless device based on the power adjustment value. In this manner, different transmit power control mapping tables can be used in different scenarios, which allows fast uplink power control.

A terminal apparatus determines the parameter f.sub.c(i), based on at least whether an RRC layer parameter symPUSCH_UpPTS is configured for the terminal apparatus, calculates transmit power for PUSCH transmission in a subframe i, based on at least the parameter f.sub.c(i), maps a PUSCH to a SC-FDMA symbol of a special subframe, based on the RRC layer parameter symPUSCH_UpPTS, and transmits the PUSCH.

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.