This disclosure provides systems, methods, apparatus, including computer programs encoded on computer storage media for orthogonal multiplexing of high efficiency (HE) and extremely high throughput (EHT) wireless traffic. Devices in a wireless local area network (WLAN) may operate under HE or EHT conditions. An access point (AP) may support both HE and EHT communications with WLAN devices. To enable substantially simultaneous downlink HE and EHT transmissions and substantially simultaneous uplink HE and EHT transmissions, the AP may support orthogonal frequency-division multiple access (OFDMA) of HE and EHT transmissions. For example, pre-HE and pre-EHT modulated fields, HE and EHT modulated fields, and payloads may be aligned in time for the HE and EHT transmissions. The AP may ensure orthogonality for multiplexing the HE and EHT transmissions based on the alignment. In some implementations, a trigger frame may be utilized to indicate uplink transmission alignments.

Methods and systems that enable recovery lost packets that were transmitted over a communication network. In one embodiment, a device includes a receiver and a processor. The receiver receives n packets that belong to a set comprising n+2 packets transmitted over the communication network, where the set includes: n data packets, a row parity packet (RPP), and a diagonal parity packet (DPP). Each received packet comprises n segments. Each segment of the RPP comprises a result of a parity function applied to a set comprising n segments, each belonging to a different packet from among the n data packets. Each segment of the DPP comprises a result of a parity function applied to a set comprising n segments, each belonging to a different packet selected from a group comprising the n data packets and the RPP. The processor may utilize the received packets to recover two lost packets.

A method of a reception apparatus for receiving transmission frames. The method includes receiving, by circuitry of the reception apparatus, the transmission frames transmitted on one millisecond boundaries. Each of the transmission frames includes a bootstrap, a preamble, and a payload. The method further includes determining, by the circuitry, an absolute point of time at a predetermined position in a stream of the transmission frames based on first time information included in a first one of the transmission frames.

A low-latency network device and method for treating serial data comprising an oscillator generating a device-wide clock; a receiving physical medium attachment (PMA) having an internal data width, a symbol timing synchronization module configured to receive the parallelized sample stream; and detect therefrom synchronized bit values corresponding to bit values of the received serial data; and a physical convergence sublayer (PCS). The PMA is configured to receive the serial data, deserialize the serial data based on the device-wide clock and internal data width, whereby the received serial data is oversampled, the oversampling of the received serial data being asynchronous relative to a timing of the received serial data, and output a parallelized sample stream. The PCS is configured to receive the synchronized bit values; and delineate packets therefrom to provide packet-delineated parallelized data. The PMA, the symbol timing synchronization module and the PCS are all driven by the device-wide clock.

A network element includes a port; and a device with circuitry configured to encode data for communication to a second device via a plurality of physical channels, and utilize one of the plurality of physical channels as a dedicated timing channel with encoding thereon different from encoding on the other plurality of physical channels, and interface encoded data via the plurality of physical channels with the port for transmission and reception with a second device.

Methods and systems that enable recovery of a lost packet from an incomplete block transmitted over a communication network. In one embodiment, a system includes a first processor configured to: receive a block of packets during a period spanning a certain duration, calculate a parity packet (PP) for the block, and provide in PP an indication of the number of packets in the block, where the block comprises k<n packets, and the certain duration is long enough to enable the processor to receive at least n packets. A transmitter transmits the k packets and PP. A receiver receives, over a period that is not longer than the certain duration, packets sent by the transmitter. A second processor detects, based on the number indicated in PP, that one of the k packets of the block was lost, and utilizes PP to recover said lost packet.

A distributed hybrid algorithm that synchronizes the time and rate of a set of clocks connected over a network. Clock measurements of the nodes are given at aperiodic time instants and the controller at each node uses these measurements to achieve synchronization. Due to the continuous and impulsive nature of the clocks and the network, we introduce a hybrid system model to effectively capture the dynamics of the system and the proposed hybrid algorithm. Moreover, the hybrid algorithm allows each agent to estimate the skew of its internal clock in order to allow for synchronization to a common timer rate. We provide sufficient conditions guaranteeing synchronization of the timers, exponentially fast. Numerical results illustrate the synchronization property induced by the algorithm as well as its performance against comparable algorithms from the literature.

A method for timestamping and synchronization with high-accuracy timestamps in low-power sensor systems is provided. The method is performed by a device and includes: receiving, by a sensor hub of the device, an interrupt signal from a sensor and performing an interrupt service routine (ISR) to obtain an interrupt timestamp obtained by a latch, wherein the interrupt timestamp is obtained from an always-running unified time reference; obtaining, by the sensor hub, sensor data from the sensor; predicting, by the sensor hub, a prediction timestamp based on an amount of sensor data and the interrupt timestamp by using a filtering algorithm; and correcting, by the sensor hub, a timestamp of each sensor data based on the prediction timestamp.

This disclosure provides systems, methods, apparatus, including computer programs encoded on computer storage media for orthogonal multiplexing of high efficiency (HE) and extremely high throughput (EHT) wireless traffic. Devices in a wireless local area network (WLAN) may operate under HE or EHT conditions. An access point (AP) may support both HE and EHT communications with WLAN devices. To enable substantially simultaneous downlink HE and EHT transmissions and substantially simultaneous uplink HE and EHT transmissions, the AP may support orthogonal frequency-division multiple access (OFDMA) of HE and EHT transmissions. For example, pre-HE and pre-EHT modulated fields, HE and EHT modulated fields, and payloads may be aligned in time for the HE and EHT transmissions. The AP may ensure orthogonality for multiplexing the HE and EHT transmissions based on the alignment. In some implementations, a trigger frame may be utilized to indicate uplink transmission alignments.

Compact timestamps and related methods, systems and devices are described. An encoder is configured to generate compact timestamps of the disclosure by sampling states of linear feedback shift registers (LFSRs). A decoder may be configured to determine timing information responsive to the compact timestamps.