157 results about "Channel assessment" patented technology

The invention discloses a multi-mode underwater acoustic communication system and communication method based on a heterogeneous dual-core architecture, and belongs to the technical field of underwater acoustic communication. The multi-mode underwater acoustic communication system comprises a main control module, an acquisition module and a transmitting module; the main control module adopts a dual-core heterogeneous processor OMAPL138 formed by an ARM core processor and a DSP core processor; inter-core communication is carried out between the ARM core processor and the DSP core processor through a shared memory and interruption; the ARM core processor is responsible for protocol analysis, task scheduling and man-machine interaction, and the DSP core processor focuses on signal processing and real-time control and integrates four communication systems, a channel evaluation module and the like. The problems that application of a single communication mode is limited and underwater acoustic communication links in different complex sea areas are unstable are effectively solved, and the deep sea area underwater vehicle information collaboration and return and deep sea area observation and monitoring network system capacity are effectively improved and guaranteed.

The invention relates to the technical field of automobile communication, in particular to a wireless connection optimization method and device for an intelligent cabin car-aircraft interconnection system, electronic equipment and a storage medium, and the method comprises the steps: constructing a candidate channel list based on a network unique identifier and channel information of a historical successful connection network; concurrently performing a Wi-Fi scan on a plurality of common channels in the candidate channel list to identify at least one candidate wireless connection link; taking the candidate channel with the highest channel quality score in the candidate channel list as a target channel; wherein the channel quality score is calculated based on the packet loss rate, the signal strength and the interference parameter of the candidate channel. According to the method, on the basis of historical channel weights and a multi-stage concurrent scanning mechanism, consumed time of a Wi-Fi scanning stage is reduced, a target channel is rapidly determined through dynamic channel evaluation, and the connection speed and the connection success rate of the whole process are improved by combining asynchronous split WPA2 handshake and service initialization parallelization.

The invention relates to the technical field of wireless communication, in particular to an OTA upgrading method and system for Bluetooth sound equipment. The method comprises the following steps: acquiring to-be-upgraded firmware data and currently played audio data, and acquiring power amplifier current feedback data of a sound speaker by sending a double-frequency detection signal containing 21kHz and 22kHz; acquiring equipment transmission capability confirmation data according to a silent response mode of the sound equipment to the preset handshake signal; and calculating a nonlinear distortion coefficient of the loudspeaker according to the intensity of the 1kHz difference frequency component in the power amplifier current feedback data, and obtaining real-time channel evaluation data based on current waveform deviation analysis. According to the method, the nonlinear distortion degree of the loudspeaker is accurately evaluated through the 1kHz difference frequency component generated by the 21kHz and 22kHz dual-frequency detection signals, so that the reliability of data transmission is more accurately predicted.

Systems and methods for User Equipment (UE) operation in presence of Clear Channel Assessment (CCA) are provided. In some embodiments, a method performed by a wireless device for cell selection accounting for requirements includes: determining a measurement period in a serving cell for the cell selection or cell re-selection (T1), wherein the measurement period is determined based on a number of consecutive Discontinuous Reception (DRX) cycles; determining a number of measurement occasions configured with a Discovery Reference Signal (DRS) in the serving cell during T1; determining availability of the DRS at the measurement occasions; and performing measurement based on availability of the DRS at the measurement occasions during T1. In this way, a wireless device may operate in NR RRC_IDLE / RRC_INACTIVE in the presence of CCA, e.g., Listen-Before-Talk (LBT).

Methods performed by a wireless device and a base station for adapting maximum allowed Clear Channel Assessment (CCA) based on operational occasion periodicity are provided. In examples disclosed herein, a wireless device is configured to determine an operational occasion periodicity of a signal that is subject to CCA. Accordingly, the wireless device can determine an association at least between the determined operational occasion periodicity and a maximum number of allowed CCA failures for communicating the signal. The wireless device can then perform one or more operational tasks based on the determined maximum number of allowed CCA failures. By determining the maximum number of allowed CCA failures, the wireless device can obtain information about downlink CCA failures and use the obtained information for adapting measurements procedures in serving cell operational tasks.

In a Wireless Local Area Network system, a reception STA can receive a request to send (RTS) frame. The RTS frame may include bandwidth information. The reception STA can perform clear channel assessment (CCA) on the basis of the bandwidth information. The reception STA can determine a transmission channel on the basis of the result of the CCA and information about preset multiple resource units (MRUs). The reception STA can transmit a clear to send (CTS) frame through the transmission channel. The transmission channel is one of the preset MRUs and may be a channel in which the CCA result is idle. The preset MRUs may include a first MRU composed of a first 996 tone RU, a second 996 tone RU, a third 996 tone RU, and a 484 tone RU.

A wireless transmit / receive unit (WTRU) comprises a processor configured to receive a configuration of channel correlation measurements from a network. The configuration may be associated with an aggregation group. The processor may detect a trigger to perform the channel correlation measurements, determine one or more WTRUs associated with the aggregation group to perform the channel correlation measurements, send a request to perform the channel correlation measurements to each WTRU of the one or more WTRUs associated with the aggregation group, receive a response from at least one WTRU of the one or more WTRUs associated with the aggregation group, determine a correlation of the channel correlation measurements performed by the one or more WTRUs in the aggregation group, and send a reporting message to the network or the at least one WTRU of the one or more WTRUs.

Techniques are disclosed to detect deep fading caused by magnitude drop and rapid phase change on channels within a frequency band of a narrowband wireless radio operating in a BMS-like environment with strong multipath. The techniques may identify an interference channel, a deep fading channel, or a weak signal channel. A channel assessment algorithm may receive packets on one of multiple channels to determine a received signal strength for each packet associated with the channel. The algorithm may determine a PER associated with the channel based on a number of packets received in error and a difference between the received signal strength of each packet and a reference signal strength associated with other channels of the frequency band. The PER may be compared with a PER threshold. The channel may be excluded from use by the wireless radio if the PER for the channel is greater than the PER threshold.

A communication method, which is applied to a first multi-link device (MLD) operating in an enhanced multi-link single radio (EMLSR) mode and includes: performing, by the first MLD, a second listening operation, where the second listening operation includes: the first MLD performing a clear channel assessment (CCA) and receiving an initial control frame of a frame exchange sequence transmitted by an access point (AP) MLD through an affiliated station that operates on an EMLSR link in an awake state; and performing, by the first MLD, a first listening operation, where the first listening operation is used for a first station on the first MLD to receive a groupcast frame using a first receiving capability. The first MLD switches from the second listening operation to the first listening operation at a target time or before the target time.

The invention discloses a concurrent communication method and system based on a power line carrier communication network, and the method comprises the steps: obtaining service parameters and communication parameters in the power line carrier communication network, and carrying out the priority division of services; after the topology change of the power line carrier communication network is stable, the total number of nodes and the number of agent nodes are obtained, and the topology change time is recorded; calculating network channel evaluation time and a proxy node number threshold value; subcarrier division and distribution are carried out on each service according to service parameters, communication parameters, the total number of nodes and the number of proxy nodes of the power line carrier communication network; and recording a system communication success rate in the network channel evaluation time, calculating an SNR value and an SNR fluctuating value of a subcarrier channel, calculating a subcarrier static distribution time length by combining the system communication success rate, the SNR value and the SNR fluctuating value, and simultaneously communicating each service on the distributed subcarrier. According to the invention, the carrier network communication efficiency and the overall execution efficiency can be improved, and multi-thread processing of different service data among carrier nodes is realized.

The invention discloses a multimode narrowband ad hoc network communication system and method, and belongs to the technical field of communication systems.The multimode narrowband ad hoc network communication system is characterized in that environment sensing data of all nodes are monitored in real time, environment modes of different communication are distinguished, and corresponding channel assessment reports are generated; and determining a communication strategy of the corresponding node according to the environment sensing data and the channel evaluation report, thereby realizing narrow-band ad hoc network communication with low energy consumption, long distance and strong complex environment adaptability.

The invention relates to the technical field of software defined radio communication, and discloses a dual-mode adaptive communication method and system based on SDR. The method comprises the following steps: receiving an original wireless signal, preliminarily judging a protocol family, and activating a corresponding signal analysis engine and a channel evaluation engine; the signal analysis engine restores a complete communication message unit, and the channel evaluation engine quantitatively represents a channel state. The information of the two information is input into a dynamic decision-making network, and the network learns an implicit association rule between the semantic integrity of the message and the transmission reliability of the channel and outputs a collaborative decision-making instruction containing a mode priority weight vector. The instruction is finally compiled into a hardware configuration parameter sequence, and the radio frequency front end and the baseband unit are driven to reconfigure, so that mode self-adaptive switching is realized. According to the invention, cross-layer intelligent decision and flexible multi-mode scheduling are realized, and the reliability and efficiency of communication in a complex wireless environment are improved.

A method for resource configuration, applied to a base station, including: configuring a frame based equipment (FBE) parameter, where the FBE parameter includes: a frequency domain parameter indicating a frequency domain resource for performing clear channel assessment (CCA).

A channel assessment method includes: performing channel assessment in a shared spectrum, and alternatively, determining a channel resource occupied in the shared spectrum according to an interference condition between communication systems.

The invention provides a dual-frequency independent full-duplex communication method and device, and relates to the technical field of communication, and the method is applied to wireless communication equipment such as an AP and an STA of a Wi-Fi framework adopting a single-network-interface dual-MAC structure. According to the invention, the two MACs are distributed to the downlink communication and the uplink communication to form an independent channel, so that real duplex communication is realized by the dual-frequency technology, uplink and downlink communication competition is avoided, and the network performance and efficiency are improved; the configuration information of the two MACs is the same, when the channel of one MAC is interfered, the uninterfered MAC can maintain normal communication of the network, the interfered MAC realizes self-recovery of the channel through channel prediction and channel evaluation, and the self-recovery mechanism after channel interference improves the stability and the self-adaptive capability of the Wi-Fi network.

Systems and methods are disclosed for using clear channel assessment (CCA) on a transmission channel prior to transmission on the channel. A wireless transmission system can perform an omnidirectional CCA using a CCA power threshold calculated based on a number of synchronization signal blocks (SSBs) transmitted by the wireless transmission system using a synchronization signal block (SSB) burst or synchronization signal / physical broadcast channel (SS / PBCH) block measurement timing configuration (SMTC) window or based on a number of transmit (Tx) antennas used. The wireless transmission system can perform a directional CCA on one or more receive (Rx) beams corresponding to one or more intended Tx beams to determine directional availability of the channel using a CCA power threshold calculated based on an equivalent isotropically radiated power (EIRP) of the one or more intended Tx beams. The wireless transmission system can determine a CCA power threshold based on a scaling between an actual CCA bandwidth and a nominal CCA bandwidth.

Provided are a data transmission method and apparatus, and a storage medium. The data transmission method includes: performing, by a first communication terminal, a clear channel assessment on a target resource, where the target resource is a target time domain resource corresponding to a part of second data transmission suspended or punctured by a second communication terminal, and the first communication terminal and the second communication terminal satisfy a transmission multiplexing condition; and when a channel is determined to be in an idle state, transmitting, by the first communication terminal, first data on the channel.

A wireless network device configured to monitor multiple channels for clear channel assessment (CCA) is disclosed. The receiver circuit of the network device includes at least one CCA block for indicating whether a particular channel is clear. In some embodiments, the network device sequentially checks each channel and transmits at least one data packet if both channels are clear. The at least one data packet can include a mode switch data packet and a second data packet transmitted using a new PHY mode. The network device can also have multiple CCA blocks. In this case, the channels can be checked simultaneously and the network device transmits at least one data packet if both channels are clear. Alternatively, the network device simultaneously monitors multiple channels and selects one of the channels to transmit a preferred PHY mode on that channel, thereby avoiding the need for a mode switch data packet.

This invention relates to the field of wireless communication network optimization technology, specifically to an antenna layout and relay configuration optimization method based on a channel prediction surrogate model. The method includes: acquiring a digital twin environment model of the area to be optimized; constructing an original sample set by calculating channel parameters between candidate antennas and relay nodes through ray tracing; training and constructing a channel prediction surrogate model using improved sparse Gaussian process regression; and using location parameters as input and output channel quality indicators. A joint decision vector for antenna, relay location, and transmit power is defined, and an optimization objective function for total system capacity and deployment cost is defined. The surrogate model is embedded in Bayesian optimization as a fast evaluator, and the joint decision vector is iteratively sampled and evaluated. After convergence, the optimal layout configuration scheme is output. This method replaces real-time simulation with a dedicated surrogate model, achieving multi-parameter joint optimization and improving the efficiency of channel evaluation and optimization iteration.

The invention discloses a wireless terminal security management and control method and system, and relates to the technical field of power system communication security. The method comprises the following steps: in a communication connection establishment stage, establishing a shared key through WAPI bidirectional authentication and post quantum key encapsulation, and initializing a physical layer waveform parameter synchronization mechanism; in the security situation assessment stage, collected equipment characteristics, near field communication and electromagnetic environment data are fused, quantitative analysis is performed through a neural network and an attack graph model, and a dynamic security threat level is obtained; in the security policy execution stage, the security policy and physical layer parameters are adaptively adjusted according to the threat level and the channel assessment result to form closed-loop management and control. According to the method, the problems of single protection means, response lag and lack of quantum safety capability of a traditional scheme in complex environments such as a new energy station are solved, and active, accurate and self-adaptive wireless terminal safety protection is realized.

An integrated circuit of a communication device for controlling a communication process, the communication process comprising: receiving a PHY protocol data unit comprising a duration field, the duration field comprising duration information indicating a duration for which the communication device is prohibited from transmitting a high efficiency, HE, trigger-based TB PHY protocol data unit; issuing a PHY-CCA clear channel assessment primitive parameter indicating bandwidth information about a busy or idle state of each subchannel within an operating bandwidth; updating a network allocation vector, NAV, value based on the duration information when the indicated duration is greater than a current NAV value, and when it is determined that the communication device is not a target receiver of the received PHY protocol data unit; determining a busy / idle state of at least one subchannel comprising a resource unit, RU, in which an HE TB PHY protocol data unit is to be transmitted; and controlling transmission of the HE TB PHY protocol data unit based on the updated NAV value and the busy / idle state of the at least one subchannel, and controlling transmission of the HE TB PHY protocol data unit when the at least one subchannel does not include a primary subchannel, regardless of whether the primary subchannel is busy or idle.

The invention discloses an interference scanning method and device, a channel evaluation method and electronic equipment. The interference scanning method comprises the following steps: performing interference scanning on each Bluetooth channel by adopting a discrete scanning sequence to obtain scanning data of each Bluetooth channel; carrying out effective judgment and preprocessing on scanning data of each Bluetooth channel; and determining interference envelope distribution of all the channels of the Bluetooth according to the preprocessed scanning data of each channel of the Bluetooth. According to the embodiment of the invention, each Bluetooth channel is scanned through discrete order scanning, so that the maximum time interval of scanning 13 Wi-Fi channels within 2402MHz to 2480MHz is relatively small, and compared with sequential scanning or common other order scanning, the probability of scanning missing caused by Wi-Fi interference can be reduced.

The invention relates to a resource allocation method and device for a multi-user orthogonal frequency division multiplexing system. The method comprises: sending a channel assessment message carrying a pre-configured channel assessment frame to a plurality of user nodes, the channel assessment message being used for indicating each user node to perform channel assessment according to the received channel assessment frame, and feeding back an average channel gain and an average signal-to-noise ratio obtained by assessment to a main node, the pre-configured channel evaluation frame is obtained based on configuration of a preset orthogonal frequency division multiplexing symbol sequence; receiving an average channel gain and an average signal-to-noise ratio fed back by each user node; and for each user node, determining a target bit number and target sending power allocated to the user node according to the average channel gain and the average signal-to-noise ratio fed back by the user node, generating a channel resource configuration frame according to the target bit number and the target sending power, and sending the channel resource configuration frame to the user node. By adopting the method, the calculation complexity of resource allocation can be reduced.

This document discloses methods, systems, and devices related to digital wireless communications, and more specifically, to techniques for adjustable clear channel assessment for multi-link devices with limited simultaneous transmission and reception. The adjustable clear channel assessment method includes adjusting a signal strength measurement algorithm or adjusting an energy detection threshold used for assessment when setting a multi-link network allocation vector for transmission. A method for wireless communications includes identifying, by a wireless device, that a first wireless link and a second wireless link of the wireless device are in a detection state at a first time. The method further includes modifying, by the wireless device, a multi-link channel availability assessment process for the second wireless link based on detecting the transmission state of the first wireless link at the first time.

Methods, apparatuses, and systems are disclosed for compensating for cell identification delays that are beyond the control of the UE, in connection with standards-specified cell identification timing limits. In frequency bands including both beam sweeping and listen-before-talk (LBT) requirements, a cell identification procedure may be significantly delayed due to LBT failure at the base station and / or beam misalignment between the base station and the UE. Therefore, UE cell identification timing constraints may be dynamically adjusted to compensate for such delays. For example, the time window allowed for cell identification of a neighbor cell may be dynamically increased in response to determining that one or more SSBs were not available at the UE during an SMTC occasion. In some scenarios, if the timing increase exceeds a predetermined threshold, the UE may restart the cell identification procedure, e.g., on the same frequency layer or on a different frequency layer.

Techniques are disclosed to detect deep fading caused by magnitude drop and rapid phase change on channels within a frequency band of a narrowband wireless radio operating in a BMS-like environment with strong multipath. The techniques may identify an interference channel, a deep fading channel, or a weak signal channel. A channel assessment algorithm may receive packets on one of multiple channels to determine a received signal strength for each packet associated with the channel. The algorithm may determine a PER associated with the channel based on a number of packets received in error and a difference between the received signal strength of each packet and a reference signal strength associated with other channels of the frequency band. The PER may be compared with a PER threshold. The channel may be excluded from use by the wireless radio if the PER for the channel is greater than the PER threshold.

The invention discloses an anti-nesting self-adaptive protection method and system for a power transmission line, and relates to the technical field of power transmission line protection. The method comprises the following steps: deploying multiple sensors at key parts of a power transmission line tower, and constructing a sensing network to detect bird activity data flow in real time; calling the nesting threat evaluation dual-channel through an edge calculation unit, carrying out the recognition evaluation of the data flow, and outputting a threat parameter; analyzing the threat parameters based on a bird nesting protection strategy library, and determining a target protection strategy; and according to the strategy parameters, a nesting blocking and expelling linkage device is controlled, and self-adaptive feedback protection is carried out on the tower. The technical problems of short circuit, tripping and other potential safety hazards caused by bird nesting to the safety of the power transmission line are solved, bird activities are accurately detected in real time through a multi-mode sensing network, nesting behavior recognition and threat degree quantification are completed in combination with edge calculation dual-channel evaluation, the risk of short circuit tripping of the line is reduced, and the safety of the power transmission line is improved. And the operation reliability and the intelligent operation and maintenance level of the power transmission line are improved.

A method is disclosed in which a user equipment (UE) that communicates with a radio access network (RAN) maintains information for configuring timing of fixed frame period (FFPs) for a listen-before-talk (LBT) procedure. When the UE has data to be transmitted, it performs a clear channel assessment, CCA, to determine if a communication channel is clear. When the CCA indicates that the communication channel is clear a channel occupancy time, COT, is initiated for the UE within a subsequent FFP and transmission of the data commences. However, transmission of the data ceases following receipt of an indication, from a node of the RAN, that the transmission should be stopped.

The invention discloses a master-slave mode dynamic channel assessment frequency hopping method based on SX1262, and belongs to the technical field of wireless communication. According to the method, communication connection is established through a master node and slave nodes, RSSI, SNR and CAD states of all candidate frequency points are obtained in real time through an SX1262 chip, 100 pieces of historical data serve as a cache, basic quality, RSSI stability, CAD interference and timeliness trend four-dimensional scoring is conducted on 13 candidate frequency points, an optimal frequency point pool is screened out, two non-adjacent high-quality frequency points are randomly selected, and the optimal frequency point pool is obtained. And synchronous frequency hopping communication of the master and slave nodes is realized. Meanwhile, a set of simplified self-defined communication protocol is designed, a master node sends 128 bytes of frames, slave nodes respond to 4 bytes of frames, and protocol overhead is remarkably reduced. Compared with the prior art, the optimal communication frequency point can be adaptively selected in a complex interference environment, the communication reliability is effectively improved, the power consumption is reduced, the spectrum utilization rate is improved, and the method is widely applied to a low-power-consumption wide-area Internet of Things scene.

The invention provides a channel evaluation method for power line carrier communication and electronic equipment. The method comprises the following steps: acquiring a channel evaluation frame which is sent by a signal sending end through multiple spatial streams and comprises a time domain training signal and a time domain load signal; respectively executing fast Fourier transform on the two types of time domain signals to obtain corresponding frequency domain training signals and frequency domain load signals; estimating a first channel matrix of the frequency domain training signal, calculating a training signal residual error to identify an abnormal frequency domain symbol, processing to obtain an effective training signal, and estimating a second channel matrix and a noise covariance matrix of the effective training signal; constructing a channel equalization matrix based on the two matrixes, and respectively processing the two types of frequency domain signals to obtain a training signal signal to interference plus noise ratio and a load signal signal to noise ratio of each subcarrier of each spatial stream; and finally, carrying out weighted fusion on the two types of indexes to generate a fusion signal-to-noise ratio for evaluating the channel quality of each subcarrier of each spatial stream. According to the invention, robustness and accuracy of power line carrier communication channel evaluation can be considered.