A wireless data transmission method includes sending by an external device a data packet; receiving by a primary device and a secondary device the data packet sent by the external device. When the secondary device does not receive the data packet sent by the external device correctly, sending by the secondary device a feedback signal to the primary device. When the secondary device receives the data packet sent by the external device correctly, not sending the feedback signal. The method further includes detecting by the primary device if the secondary device has sent the feedback signal. When the primary device receives the data packet successfully and detects that the secondary device has not sent the feedback signal, sending by the primary device an ACK signal to the external device; otherwise, sending by the primary device a NACK signal to the external device.

A method for managing power during communication with an implantable medical device, including establishing a communications link, utilizing a power corresponding to a session start power, to initiate a current session between an implantable medical device (IMD) and external device. A telemetry break condition of the communications link is monitored during the current session. The power utilized by the IMD is adjusted between low and high power levels, during the current session based on the telemetry break condition. The number of sessions is counted, including the current session and one or more prior sessions, in which the IMD utilized the higher power level, and a level for the session start power to be utilized to initiate a next session following the current session is adaptively learned based on the counting of the number of sessions.

A handheld device, a base station and transmission control methods thereof are provided. The handheld device transmits an uplink signal to the base station. The uplink signal comprises an uplink dedicated physical data channel (UL DPDCH) carrying data information in the first half of the non-transmission gap (non-TG) data slots and a corresponding uplink dedicated physical control channel (UL DPCCH) carrying control information according to a transmission mode.

A device may be coupled to a time slot based communication system and receive a timing beacon packet that is broadcast in a time slot of the communication system at a periodic rate, in which the network uses a time slotted channel hopping protocol of sequential frames each having a plurality of time slots. The device may synchronize its time base to the timing beacon. The device may calculate a sleep time corresponding to a number of time slots until a next time slot that is scheduled for use by the device and then place the device in a sleep mode. The device may be awakened after the sleep time and operate during the next time slot. The device may repeat the process of calculating a sleep time, going into sleep mode, and waking for operation after the sleep time in order to reduce power consumption.

Conventional Bluetooth low energy (or like personal wireless network) controllers cannot resolve private addresses without some calculation from a host processor but leaving the host processor on or awaking it from a sleep each time a non-trusted device attempts to connect wastes power. Hostless private address resolution allows a host controller to enter a sleep state off while the Bluetooth controller advertises its device name, primary services, rejects connection requests from non-trusted devices with public and private addresses, and awakens the host controller upon a connection request from a trusted client device with a public or private address. Not only does this approach reduce power consumption by allowing the host processor to remain in the sleep state it simultaneously ensures security by allowing the private address resolution to remain active on the Bluetooth controller.

This disclosure relates to techniques for dynamic selection of connection attempt throttling algorithms based on user context. According to some embodiments, a wireless device may monitor certain current conditions of the UE, such as battery level, user activity level, motion level, and/or other conditions. Depending at least in part on the current conditions of the UE, cellular connection attempt parameters may be selected. In some conditions the cellular connection attempt parameters may be selected such as to allow more aggressive pursuit of cellular connectivity, while in other conditions the cellular connection attempt parameters may be selected such as to allow less aggressive pursuit of cellular connectivity.

A communication device for power saving and a method for controlling power thereof are provided. The communication device includes a power amplifying unit and a control unit. The power amplifying unit generates an output signal obtained by amplifying a downlink signal, using a supply voltage, and outputs the output signal. The control unit determines a current state by comparing predetermined downlink reference information with output signal information on the output signal, and, if the current state is an active state as a comparison result, controls the supply voltage to correspond to the output signal information. Accordingly, power for amplifying a signal can be controlled according to communication traffic, thereby preventing consumption of unnecessary power.

Techniques for acknowledging communications from multiple devices are described herein. For example, a device may broadcast a group acknowledgement message indicating that communications from multiple devices have been received by the device. Each acknowledgement in the group acknowledgement message may include a device identifier for a device that sent a communication (e.g., a Medium Access Control (MAC) address of the device, a hash of the MAC address of the device, etc.) and a communication identifier for the communication (e.g., a sequence number of the communication, a Cyclic Redundancy Check (CRC) code for the communication, etc.).

The present invention relates to an apparatus and method for power saving of a terminal in a wireless communication system and, particularly, to an apparatus and method for power saving of a terminal in a wireless LAN system. A method according to an embodiment of the present invention, which is a data transmission and reception method for power saving of a terminal in a wireless LAN system access point, may comprise the steps of: transmitting a control frame including information for channel bonding power saving control; when there is data to be transmitted from a specific terminal, determining whether the corresponding terminal is in a state where a channel bonding power saving control function is activated; when the terminal is in a state where the channel bonding power saving control function is activated, checking whether the terminal is in a dynamic mode; and when the terminal is in the dynamic mode, configuring the data to be transmitted as a data frame for transmitting the data in a channel bonding scheme, and transmitting the data frame.

Systems and methods for managing use of power of a wireless communication device configured to communicate over a plurality of radio links. A criterion is detected, and one of the plurality of radio links is selected as a selected radio link based on detecting the criterion. Operation of the selected radio link is switched from a first operating mode to a second operating mode, and operation of one or more remaining radio links of the plurality of radio links is disabled. In response to switching operation of the selected radio link to the second operating mode, the selected radio link oscillates between an awake state and an asleep state. Radio traffic information for the plurality of radio links is received, via the selected radio link, during the awake state.