A terminal-side communication apparatus that transfers signals between a first network and a second network includes a wireless time synchronizer capable of time-synchronizing with the first network, a wireless time real-time clock that outputs the time in the first network, a wireless interface that stamps a reception time when receiving a signal from the first network, and a propagation delay variation monitoring unit that stores a propagation delay correction command value, time information contained in a signal, and the reception time of the time information, the propagation delay correction command value and the signal being received by the wireless interface, determines the state of propagation delay in the first network, using the propagation delay correction command value, the time information, and the reception time, and determines that timing to calculate clock drift with respect to the first network is provided when the propagation delay is within an acceptable level.

A wireless data acquisition system includes a data acquisition unit including a data sensor; a first wireless data link and a second wireless timing link with predicable or low latency. Stimulus and time markers come from a trigger generator. Data signals from the data sensor are transmitted across the wireless data link and timing information of the data acquisition unit is transmitted across the wireless timing link. A receiving host receives the transmitted data and timing information for logging and/or processing.

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.

The present invention provides a method for detecting an uplink synchronization signal in a wireless access system supporting a high-frequency band, a method for designing a detection filter for the same and an apparatus for supporting the same. According to one embodiment of the present invention, a method for detecting a random access channel signal by a base station in a wireless access system supporting the high-frequency band comprises: allocating a cyclic shift value used in the base station; configuring a received signal vector for a signal transmitted via a random access channel; detecting at least one RACH signal from the received signal vector, using a frequency domain detecting filter; and identifying at least one terminal having transmitted at least one RACH signal, using a target terminal detecting filter, wherein the filter for detecting a target terminal may be set on the basis of the cyclic shift value.

A wireless communication device may have at least a first subscriber identification module (SIM) and a second SIM associated with a shared radio frequency (RF) resource. The wireless communication device may determine whether some or all of a critical radio resource control (RRC) control message from a first network supported by the first SIM was missed during a tune-away. In response to determining that some or all of a critical RRC control message was missed during the tune-away, the wireless communication device may start a downlink expiration timer, determine whether the downlink expiration timer has expired without receiving sufficient information to complete the critical RRC control message. If so, and if the modem stack associated with the first SIM has lost downlink synchronization with the first network for a number of consecutive radio frames, the wireless communication device may declare a radio link failure for that SIM.

Exemplary systems and methods can be provided for measuring a parametere.g., channel impulse response and/or power delay profileof a wideband, millimeter-wave (mmW) channel. The exemplary systems can include a receiver configured to receive a first signal from the channel, generate a second signal, and measure the parameter based on a comparison between the first and second signals; and a controller configured to determine first and second calibration of the system before and after measuring the parameter, and determine a correction for the parameter measurement based on the first and second calibrations. Exemplary methods can also be provided for calibrating a system for measuring the channel parameter. Such methods can be utilized for systems in which the TX and RX devices share a common frequency source and for systems in which the TX and RX devices have individual frequency sources that free-run during channel measurements.

Devices in a wireless telecommunication system can implement a blockchain that is distributed among the devices. For example, a base transceiver station of the wireless telecommunication system can receive, from a mobile device, a wireless radio communication that includes information associated with a blockchain transaction. The base transceiver station can convert the information associated with the blockchain transaction into an internet protocol (IP)-based format. The base transceiver station can update the blockchain by propagating the formatted information to other base transceiver stations of the wireless telecommunication system through an IP-based network that is internal to the wireless telecommunication system.

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.

A transmission control device includes an acquiring unit that acquires propagation delay time for each propagation path between a plurality of terminal devices and a plurality of transmitter stations; a selector that selects, based on the propagation delay time acquired by the acquiring unit, combinations of terminal devices having similar propagation delay differences from the plurality of the transmitter stations; and a controller that controls transmission timing of the plurality of the transmitter stations that transmit signals to the combinations of the terminal devices selected by the selector.

A technique is performed at a user equipment (UE) for supporting one or more radio frequency (RF) sensing measurements. A reflected downlink signal is received, wherein the reflected downlink signal is transmitted as a downlink signal from a base station and reflected off of a target. An uplink signal is transmitted to be reflected off of the target and received by the base station as a reflected uplink signal. A UE receive-transmit (RX-TX) time difference is determined, representing a difference between a time at which the reflected downlink signal is received by the UE and a time at which the uplink signal is transmitted by the UE. A UE measured frequency offset is determined based on reception of the reflected downlink signal, the UE measured frequency offset comprising a Doppler shift component corresponding to a velocity of the target.