The present disclosure relates to systems and methods for operating transceiver circuitry to transmit or receive signals on various frequency ranges. To do so, an electronic device may determine a receive delay between one or more messages received on different component carriers and may transmit the receive delay to a base station to update how communications are transmitted on one of the component carriers. The update made to at least one of the component carriers may compensate for the receive delay between the different component carriers. Compensating for the receive delay may improve operations that delay downlink communications to reduce a likelihood or stop simultaneous downlink and uplink communications by further adjusting for delays seen at an electronic device when communicating with base stations disposed at a different distances from the electronic device.

A method for maintaining synchronization of nodes in a mesh network includes: receiving primary beacons from a first transmitting node during a predetermined time interval, each of the primary beacons comprising time information indicating a time that a respective primary beacon was transmitted; comparing the time that each of the primary beacons was transmitted with a time that each of the primary beacons was received to determine a time difference; accumulating the time difference for each primary beacon received from the first transmitting node during the predetermined time interval to generate a first time synchronization error; comparing the first time synchronization error to a first threshold value; and in response to determining that the first time synchronization error exceeds the first threshold value, transmitting a first request to the first transmitting node to increase a rate of beacon transmissions for a specified period of time.

The present application relates to a multichannel access control method in an overlapped vehicular network, and more specifically, a multichannel access control method in vehicular networks, for managing a Wireless Access in Vehicular Environments (WAVE) basic service set (WBSS) vehicular network which is managed by a WAVE extended service set control and management system (WESS-CM) and is provided by using a road side unit (RSU) in a plurality of vehicle environments having overlapped areas, comprising: configuring Time Division Multiple Access (TDMA)-slots (T-slots) divided from the synchronization interval with respect to the CCH and a Basic Safety Message channel (BSMCH) for each WBSS that has a control channel (CCH) and the BSMCH in which the synchronization interval are preset, and distributing T-slots divided from the CCH to a plurality of the WBSS; wherein the first T-slot of the group of T-slots of the CCH is used to broadcast a beacon message including TDMA information of the WBSS such as the identification of the WBSS and the number of T-slots used in the CCH such that a vehicular networking is performed normally even at various vehicle densities, thereby providing higher scalability, reliability, and flexibility.

In one aspect of the teachings herein, a transmitter transmits synchronization signals according to one or more defined transmission characteristics that enable a receiver to distinguish the type of transmitter and/or the type of carrier used to convey the synchronization signals. Different types of transmitters reuse at least some of the same synchronization signal sequences and generation algorithms, but use different transmission parameters to impart one or more recognizable characteristics to the transmitted synchronization signals. In turn, an appropriately configured receiver “knows” which characteristics are associated with which transmitter and/or carrier types. For example, wireless devices operating in a wireless communication network transmit device-generated synchronization signals that reuse at least some of the same sequences used by network base stations for the transmission of network synchronization signals. However, device-generated synchronization signals are transmitted using a relative positioning or mapping that characteristically differs from that used for network synchronization signals.

Method and system of wireless TDMA scheduling for industrial machine-to-machine communication, including propagation-delay-aware scheduling. A method of scheduling in a TDMA based communication system between a first node and a plurality of second nodes by means of a respective communication link. The method may comprise obtaining a propagation time for each communication link; and determining the largest difference in propagation times of two communication links. The method may further include selecting a first mode of scheduling if the largest difference is smaller than a threshold, and selecting a second mode of scheduling if the largest difference is larger than the threshold. The first mode includes selecting a guard time to be applied in each of the time slots, which guard time is based on the largest difference. The second mode is propagation-delay-aware and includes scheduling the transmission from each second node on the basis of the respective propagation time.

In some examples, a source device categorizes a plurality of messages for transmission to a recipient device, the plurality of messages comprising vehicle-related information. Based on the categorizing, the source device identifies selected messages of the plurality of messages to be aggregated. The source device aggregates the selected messages into a single transmission from the source device to the recipient device.

A method for estimating a time-of-arrival of a packet received by a receiver includes storing a reference bit-pattern and receiving a plurality of samples in a samples-buffer. In a bit-pattern detector, a matching group of samples having a bit-pattern which matches the reference bit-pattern is identified. In a correlator, a group of three correlation values is determined from the matching group of samples, including a local maximum correlation value, P0, an immediately preceding correlation value, Pm, and an immediately succeeding correlation value Pp. In an estimation unit, a polynomial function f(δ) of the difference, δ, between Pm and Pp is used to estimate a timing offset T.sub.frac, between the local maximum correlation value and a correlation peak. The time-of-arrival is estimated from a time of the local maximum correlation value P0, and T.sub.frac.

A wireless communication apparatus includes a transmission/reception unit, a measurement unit, a physical layer, an acquisition unit, and a control unit. The transmission/reception unit transmits/receives packets to/from a communication peer. The measurement unit starts measuring a time period after a predetermined time from an end of the packet transmitted to the communication peer. The physical layer detects a synchronization code included in the packet transmitted from the communication peer and generates a synchronization detection signal. The acquisition unit acquires a measured value by the measurement unit when receiving the synchronization detection signal. The control unit has a function to change the physical layer to a physical layer with a different error tolerance, and calculates a propagation delay by subtracting a length of a synchronization code from the measured value and judges whether to update the physical layer or not depending on the propagation delay.

The exemplary embodiments describe devices, systems and methods for implementing various exemplary techniques related to fifth generation (5G) new radio (NR) cell search. A user equipment (UE) selects a frequency band to scan during a cell search procedure and identifies a frequency within the frequency band that is associated with a synchronization signal block (SSB) based on an indication of the frequency stored locally at the UE prior to the cell search procedure. The UE then scans the frequency for the SSB and determines that the SSB has been broadcast by a cell over the frequency.

The present invention relates to methods and arrangements that make it possible to control the delay for the UEs to access the EUL resources in the Enhanced Uplink in CELL_FACH state procedure, independently from the delay for the UEs to access ordinary UL resources in the RACH procedure. This is achieved by a solution where the timing of entering (or re-entering) a transmission procedure for Enhanced Uplink in CELL_FACH state is controlled with the help of a transmission control parameter defined specifically for this transmission procedure, instead of using the same parameter as for the RACH procedure.