A method, device and system for synchronization message transmission are provided. The method may include that: a transmitting end selects at least one Ethernet Physical Layer Link (PHY) for synchronization message transmission from a Flexible Ethernet (FlexE) group (S201); after encapsulating the synchronization message according to a preset encapsulation strategy, the transmitting end inserts the synchronization message into a synchronization message channel in overhead of the selected Ethernet PHY (S202); and the transmitting end transmits the synchronization message through the selected Ethernet PHY (S203).

Methods and apparatus for identification and characterization of latency in a content delivery network. In one embodiment, interaction of users with content is recorded via the collection of a plurality of tuning records; the latency is then utilize to adjust the timing on the tuning records to account for lapses in time for sending these from between entities of the network and the user devices, and for processing occurring at the devices as required. The latency is determined by taking into account an experimentally or manufacturer-derived device specific latency component, and a network latency component. The network latency component is determined in one variant by sending a message to the device from the network requesting a current system time (or other response). Once the timing of the tuning records is adjusted, these tuning records may be relied upon as being accurate representations of subscriber interaction with content on a second-by-second basis. Accordingly, tuning records may be obtained and analyzed for content which lasts for very short periods of time (e.g. advertisements).

Systems and methods are disclosed for adjusting Radio Link Monitoring (RLM), Radio Link Failure (RLF) detection, RLF recovery, and/or connection establishment failure detection for wireless devices (16) in a cellular communications network (10) depending on mode of operation. In one embodiment, a node (14, 16) in the cellular communications network (10) determines whether a wireless device (16) (e.g., a Machine Type Communication (MTC) device) is to operate in a long range extension mode of operation or a normal mode of operation. The node (14, 16) then applies different values for at least one parameter depending on whether the wireless device (16) is to operate in the long range extension mode or the normal mode. The at least one parameter includes one or more RLM parameters, one or more RLF detection parameters, and/or one or more RLF recovery parameters. In doing do, signaling overhead and energy consumption within the wireless device (16) when operating in the long range extension mode is substantially reduced.

A transmitting circuit may include a clock generation circuit and a serializer. The clock generation circuit may generate a plurality of output clock signals by performing an emphasis operation for a plurality of clock signals based on a plurality of data. The serializer may output the plurality of data as output data in synchronization with the plurality of output clock signals.

A method for performing synchronization by a device in a device to device (D2D) communication system is provided. The method includes transmitting a first synchronization signal, and transmitting offset information indicating a time difference between a synchronization reference time of the first synchronization signal and a transmission time of the first synchronization signal.

A receiver is equipped with an adaptive phase-offset controller and associated timing-calibration circuitry that together shift the timing for a data sampler and a digital equalizer. The sample and equalizer timing is shifted to a position with less residual inter-symbol interference (ISI) energy relative to the current symbol. The shifted position may be calculated using a measure of signal quality, such as a receiver bit-error rate or a comparison of filter-tap values, to optimize the timing of data recovery.

Generating, during a first and second signaling interval, an aggregated data signal by forming a linear combination of wire signals received in parallel from wires of a multi-wire bus, wherein at least some of the wire signals undergo a signal level transition during the first and second signaling interval; measuring a signal skew characteristic of the aggregated data signal; and, generating wire-specific skew offset metrics, each wire-specific skew offset metric based on the signal skew characteristic.

A smart phase switching method includes setting a first phase switching threshold, a convergence upper bound, and a convergence lower bound, sampling a received signal continuously for acquiring a phase offset accumulated value of the received signal during each period, updating the first phase switching threshold to generate a second phase switching upper bound threshold and a second phase switching lower bound threshold when a plurality of phase offset accumulated values of the received signal during a first predetermined time interval fall into a range from the convergence upper bound to the convergence lower bound, and sampling the received signal continuously for determining if a phase is switched to an opposite operating point according to a phase offset accumulated value of the received signal after the second phase switching upper bound threshold and the second phase switching lower bound threshold are generated.

A system capable of synchronizing clocks on separate devices despite variable delays between the separate devices. The system may compensate for skew (e.g., difference between clocks) and drift (e.g., frequency offset between clocks). The system may determine the skew and drift based on differences between timestamps when packets are sent from a first device to a second device and vice versa. For example, the system may estimate a first line corresponding to the fastest packets from the first device to the second device and may estimate a second line corresponding to the fastest packets from the second device to the first device. The system may determine the skew based on a midpoint between the first line and the second line, and the drift based on a slope of the first line or the second line.

Systems and methods for one-way time transfer using physical layer signaling are disclosed herein. According to some examples, a method includes generating timing information based on a clock of a transmitting device, where the timing information comprises a timestamp and metadata. The method further includes generating a preamble of a frame, where the preamble includes the timestamp and the metadata of the timing information. The method also includes forming a frame, where the frame comprises a bootstrap, the preamble, and a payload, and transmitting the frame to a receiver device. The one-way time transfer systems and methods of this disclosure can serve mobile devices that entail quick and reliable establishment of a clock.