Embodiments of the present invention provide a reference signal notification method, including: sending, by a network device, a reference signal notification message, where the reference signal notification message includes time resource information of a reference signal. According to the embodiments of the present invention, the reference signal notification message in the present invention is used to notify UE of a reference signal configuration, especially information about a CSI-RS, so that the network device can flexibly provide a reference signal, especially a CSI-RS, and the UE can more effectively receive the reference signal, especially the CSI-RS.

A method and apparatus for detecting, by a first device, a timing measurement frame from a second device, the timing measurement frame having a plurality of time measurement samples, wherein at least the first of the measurement samples has a transmit timestamp value; determining transmit timing values for the subsequent measurement samples; applying a receive timestamp value to each of the received measurement samples; and determining a relative clock drift between a clock of the first device and a clock of the second device by comparing the receive timestamp values with transmit timing values of one or more measurement samples contained in the frame.

A wireless communication system is provided for reducing the probability that latency before data transmission increases when a mobile station that is actually in sync is judged to be out of sync. A base station causes the timing calculation part to calculate the timing advance (TA) of a transmit timing from the m.sup.th mobile station; causes the timer adaptive control part to obtain the traveling speed or the time variation in TA of the m.sup.th mobile station and, adaptively determines and outputs as the timer update information the length of the m.sup.th first timer within an M number in total of synchronization timers and the length of the second timer of the m.sup.th mobile station and update the length of the m.sup.th first timer; and transmits from the downlink transmission part a downlink signal which contains timer update information.

Monitoring and mass notification systems, such as fire alarm systems, for use in occupied structures, and more particularly to wireless monitoring and mass notification systems include wireless base units that can be modular in design. This allows horns, mini horns, strobes, and audio messaging modules (e.g., speakers) to be physically plugged into the wireless base unit creating a unit with the appearance of a single physical unit. Preferably standardized plugs are used. In some cases, visual and audio modules (i.e., notification devices) have their own battery pack or external power interface. Each wireless base unit can optionally function as a repeater if it has dual transceivers (master transceiver and slave transceiver).

A wireless fire alarm notification system uses wireless repeater devices to annunciate an alarm to slave devices from the control panel. A notification device provides a local synchronization signal via wire to a secondary notification device. A method enables the activation or deactivation of child device without the child device having to query their parent repeater. A circuit to test the integrity of an active battery charger, a battery, and an isolation circuit is also shown. A method for qualifying that an RF signal meets a specified minimum acceptable level is described. A method for wirelessly sending events to avoid RF link overload is provided. A programming checksum method confirms that an annunciator has latest programming information. A method to automatically process messages from new devices without having to hardcode repeaters to support these new devices is also described.

According to certain embodiments, a method for synchronous control of timing configurations includes operating a wireless device according to a first timing configuration associated with a first delay duration for transmitting feedback to a network node. A second timing configuration associated with a second delay duration for transmitting feedback to the network node is received from the network node. The second delay duration is different from the first delay duration. In response to a first downlink transmission from the network node, a first feedback is scheduled for transmission at a transmission time determined based on the second delay duration associated with the second timing configuration.

A mobile station M is moved close to a mobile terminal unit 20 as a target object. In ST1, the absolute position of the mobile station M in an absolute coordinate system (Abs) set in a measurement area is calculated. In ST2, the relative position of the mobile terminal unit 20 in a relative coordinate system (Rel) set by the mobile station M is detected. In ST3, the orientation of the mobile station M in the absolute coordinate system (Abs) is detected. In ST4, the relative coordinate system (Rel) is rotated. In ST5, the absolute position of the mobile terminal unit 20 in the absolute coordinate system (Abs) is specified.

Disclosed are techniques for determining a beam-specific timing advance for Round-Trip Time (RTT) estimation. In an aspect, a first node receives a plurality of beams transmitted by a second node on a wireless channel, selects a first beam from the plurality of beams for transmitting a timing response, determines a timing statistic, a timing difference, and a timing advance for the first beam, wherein the timing difference comprises a difference between the timing statistic and an earliest time of arrival of the plurality of beams, and wherein the timing advance comprises a multiple of the timing difference, and transmits the timing response for the first beam to the second node on the wireless channel, wherein the first node transmits the timing response after a time delay from the timing statistic of the first beam, wherein the time delay comprises a difference between a predetermined time delay and the timing advance.

An uplink synchronization processing method, a User Equipment (UE), and a base station are provided. The method includes: receiving a component carrier (CC) uplink synchronization indication message sent by a base station, where the uplink synchronization indication message carries identification information of one or multiple newly configured CCs; sending synchronization signaling to the base station when determining that the uplink synchronization needs to be executed on all or a part of the one or multiple newly configured CCs corresponding to the identification information; and receiving a time advanced (TA) adjusting message that is sent by the base station according to the synchronization signaling, and applying a TA value carried in the TA adjusting message to the CC on which the uplink synchronization needs to be executed.

Embodiments of an uplink timing adjustment method and a terminal are disclosed. The method includes: when a Time Alignment Timer TAT corresponding to a first Timing Advance adjustment Group TAG fails, requesting, by a terminal, a serving cell corresponding to a second TAG to coordinate uplink timing of a serving cell corresponding to the first TAG; receiving, by the terminal, a Timing Advance Command TAC corresponding to the first TAG; and adjusting, by the terminal, the uplink timing of the serving cell corresponding to the failed first TAG according to the TAC corresponding to the first TAG.