A system for downlink transmission using heterogeneous power includes a plurality of sensor nodes, a coordinator connected to a network including the plurality of sensor nodes and configured to transmit data to the plurality of sensor nodes, a power source configured to supply power required for the coordinator to transmit data to each of the plurality of sensor nodes through a single transmission passage at a position away by a specific distance from the network, to the coordinator, and a battery configured to supply power required for the plurality of sensor nodes to perform communication within the network, to the plurality of sensor nodes, wherein when a destination node as a reception target of the data, among the plurality of sensor nodes, receives the data, the destination node transmits a signal indicating the data reception to the other remaining nodes among the plurality of sensor nodes.

A method for measuring a carrier in deactivated state is provided in this invention, comprising receiving a configuration mode that does not take effect immediately by a user terminal UE; if a deactivation control signaling for a carrier is received by the UE or if a carrier timer of the UE expires, switching the carrier from activated state to deactivated state, and measuring the carrier in deactivated state by the UE; or if an activation control signaling for a carrier in deactivated state that is being measured is received by the UE, terminating measurement of the carrier in deactivated state by the UE. Through controllable deactivated carrier measurement, the UE reduces battery power consumption and improves system performance. This invention also discloses an apparatus for measuring a carrier in deactivated state and a base station.

Methods and apparatus to reduce device power consumption through usage context operation. An operational mode of a mobile device is detected. A usage context corresponding to the operational is determined. A device configuration supportive of the usage context is generated. The device configuration is implemented on the mobile device.

In some examples, a wireless access network node communicates with user equipments (UEs) in a plurality of sets of subframes, the plurality of sets of subframes comprising a first set of subframes and a second set of subframes. The wireless access network node performs dynamic power control of a transmission of the wireless access network node in the first set of subframes, and does not perform dynamic power control of a transmission of the wireless access network node in the second set of subframes.

An electronic device and a power control method of an electronic device are provided. The electronic device may include: a communication circuit including a first circuit configured to perform first communication and a second circuit configured to perform second communication; a processor electrically connected to the communication circuit; and a memory electrically connected to the processor, wherein, the memory stores instructions that, when executed, cause the processor to perform operations comprising: controlling the first circuit to operate according to a first power control mode associated with the first communication, and controlling the second circuit to operate according to a second power control mode associated with the second communication when the first communication and the second communication are concurrently performed through the first circuit and the second circuit; identifying a first sleep period during which the first circuit operates in a sleep mode according to the first power control mode, and a second sleep period during which the second circuit operates in the sleep mode according to the second power control mode; and controlling the communication circuit to operate in a deep sleep mode in which the communication circuit operates with power that is less than or equal to a predetermined power in a period where the first sleep period and the second sleep period coincide.

Techniques to support operation in a compressed mode and/or a continuous packet connectivity (CPC) mode are described. In an aspect, a user equipment (UE) may obtain an assignment of enabled subframes for the CPC mode and an assignment of transmission gaps for the compressed mode. The transmission gaps may be aligned with idle times between the enabled subframes. The UE may exchange data during enabled subframes not overlapping the transmission gaps and may skip data exchanges during enabled subframes overlapping the transmission gaps. The UE may make cell measurements during the transmission gaps. In another aspect, the UE may obtain enabled subframes and skipped subframes, exchange data during enabled subframes not corresponding to the skipped subframes, and skip data exchanges during the skipped subframes. In yet another aspect, the UE may receive orders on a shared control channel to quickly enable and disable the compressed mode.

In order to solve a problem in which when a terminal is converted from an active state of transmitting data to an inactive state, the transmission power of the terminal rapidly increases, a base station can control the transmission power by predicting and reflecting, in a target SIR, a decrease in SIR which results from an increase in interference amount due to data transmission of another terminal. The present invention can ensure the quality of an uplink control channel by controlling power in consideration of the effect of interference, even when the terminal is in an inactive state.

The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple APs can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs.

A wireless communication system performing wireless communication in carrier sense multiple access/collision avoidance system is provided. The wireless communication system includes: remote controllers that corresponding to control targets and transmitting control information for controlling each of the control targets through wireless communication; and an access point that receives and relays the control information to a control apparatus of the control target. The access point includes an access point side wireless communication control portion transmitting a beacon signal and performing wireless communication with each of the remote controllers. Each of the remote controllers includes a remote controller side wireless communication control portion performing wireless communication with the access point. The remote controller side wireless communication control portion performs a carrier sense for a predetermined carrier sense period. The remote controller side wireless communication control portion transmits the control information, and shortens the carrier sense period for a next carrier sense.

The invention relates to a method and an arrangement for reducing power consumption of a receiver in a mobile communication network comprising a sender transmitting packet data on a downlink channel to one or more receivers over a radio interface. Inactive time instants and listening time instants are defined according to provided rules. The receiver is arranged to listen for information from the sender during the listening time instants and to sleep during the inactive time instants. Thus, less power will be consumed during the inactive time instants.