26 results about "Packet collision" patented technology

The invention relates to the technical field of underwater communication, in particular to a collision avoidance method suitable for digital underwater acoustic communication, which is characterized in that a neighbor propagation delay mapping database is maintained at each communication node, and inter-node propagation delay information is acquired through passive monitoring and active detection. When a node wants to send data, combining delay mapping to predict a channel occupation time slot, and judging whether the sending is conflicted with an RTS / CTS handshake stage, a data transmission stage and an ACK (Acknowledgement Character) confirmation stage which are carried out by a neighbor; if a conflict risk exists, the node delays to send the RTS and then initiates handshake until the security window is finished, so that collision caused by hidden nodes and exposed nodes is avoided, meanwhile, parallel transmission under the conflict-free condition is allowed, the channel space-time multiplexing efficiency is improved, the network throughput can be remarkably improved, the data packet collision rate is reduced, and the network performance is improved. And the node access fairness is improved.

The embodiment of the invention discloses an effective resource scheduling method and device for an underwater acoustic wireless communication network, equipment and a medium, and relates to the technical field of underwater acoustic communication resource scheduling. The method comprises the following steps: if a data sending request sent by a node is received, determining a transmission time window of the node based on the data sending request; judging whether a conflict node having a communication conflict with the node exists based on the transmission time window of the node; and if the conflict node having the communication conflict with the node exists, determining the back-off time of the node, and controlling the node to send data after the back-off time. According to the method, the resource utilization rate of the underwater acoustic network is remarkably optimized by dynamically planning the node transmission time window and actively pre-judging the communication conflict. According to the method, data packet conflicts can be avoided, and accuracy, reliability and high efficiency of data transmission in an underwater acoustic communication network are guaranteed.

This invention provides an energy efficiency optimization method for the large-scale deployment of ultra-reliable low-latency (URLLC) devices, comprising: Step 1: Calculating the short packet collision probability and short packet reception failure probability of a single device, and calculating the packet loss rate of the device based on the calculated short packet collision probability and short packet reception failure probability; Step 2: Calculating the packet loss rate of each device, and grouping devices with similar communication environments into one category based on the calculated packet loss rate; Step 3: Optimizing the energy efficiency of all devices categorized in Step 2 using a deep reinforcement learning method. The beneficial effects of this invention are: 1. The method can effectively reduce the transmission power of sensing devices sending short packets and the number of times the same short packets are repeatedly sent, significantly improving the communication energy efficiency of URLLC devices and extending their battery life; 2. The method of this invention uses a classification method, which significantly shortens the training time of deep reinforcement learning.

This invention discloses a train communication method, switching equipment, and storage medium. The method involves acquiring the device's transmission time for real-time communication data and the corresponding network topology. A processing time window for the real-time communication data is determined based on the transmission time and network topology. Each real-time communication data point corresponds to a processing time window, which includes a reception time window and a forwarding time window. The real-time communication data is then transmitted based on this processing time window. This method improves the determinism of real-time communication data transmission by determining the processing time window, avoiding data packet collisions and jitter issues during communication, and effectively improving the stability of train communication.

A multi-channel time-coordinated transmission system and method for low-altitude identification signals, belonging to the field of multi-channel transmission technology, aims to address the problem of increased air interface packet loss rate in low-altitude, high-density flight scenarios, leading to flight trajectory loss in ground monitoring systems. The method includes: acquiring the transient kinematic parameters of a low-altitude flight entity within the current period and analyzing the spatial grid hash value corresponding to the physical space where the low-altitude flight entity is located; generating a time slot offset matrix covering multiple different radio frequency bands; extracting the time delay offset corresponding to each radio frequency band based on the time slot offset matrix; mapping the identification signal frame to be transmitted to a multi-channel radio frequency module; and using the multi-channel radio frequency module to stagger the broadcasting of the identification signal frame according to the time delay offset corresponding to each radio frequency band. This invention improves the anti-interference capability of identification signals in low-altitude, high-density scenarios and reduces the data packet collision rate and packet loss rate.

The present invention belongs to the field of marine cross-medium acoustic and electrical cooperative network communication technology, and discloses an improved AODV routing method for a marine cross-medium acoustic and electrical cooperative network. The method introduces a link stability factor of radio and underwater acoustic transmission when establishing a route; the surface cross-medium node specifies relevant equipment for data transmission according to the type of the destination node; after the node receives a routing response and establishes a route, it sets a timer to send a HELLO packet for route maintenance, and other nodes that have not established a route do not send a HELLO packet; after the underwater destination node receives a routing request, it sends two consecutive routing responses to the source node. The present invention improves the route establishment and maintenance mechanism, introduces an acoustic and electrical weighted hop count and a link stability factor, solves the problems of excessive traditional AODV notification packets leading to underwater transmission packet collision, and the principle of minimum hop count leading to low packet delivery rate and large delay, reduces network delay, and improves the packet delivery rate and throughput of the integrated network.

To perform polling while avoiding packet collisions in a wireless mesh network. [Solution] The lighting control system according to the embodiment comprises each device connected to a lighting control network and an information processing device that monitors the operating status of each device. The information processing device comprises a distribution unit that assigns each device to each group and a polling unit that polls the status of each device for each group assigned by the distribution unit.

The invention discloses a parameter optimization method based on a large language model and a depth deterministic strategy gradient, which is used for solving the problem of information age deterioration caused by data packet conflict and vehicle speed related channel uncertainty in semi-persistent scheduling of the Internet of Vehicles. Firstly, an AoI calculation model influenced by the vehicle speed, the vehicle density and the resource reservation interval is established, then a double-path optimization scheme is designed, DDPG is stimulated through a state space and a reward function, and optimal parameter configuration is generated by utilizing LLM through situational learning; through the above method, the LLM can significantly reduce AoI after a small number of examples are accumulated, model training is avoided, and the DDPG method has more stable performance after training.

The present invention provides a collaborative media access control method for large-scale unmanned aerial vehicle self-organizing networks. A collaborative low-latency MAC protocol CLAM is designed for large-scale unmanned aerial vehicle self-organizing networks. CLAM is divided into task collaboration and segmented access mechanisms. In the task collaboration stage, a regional center selection algorithm is designed to select a central UAV. The segmented access mechanism includes CLAM-Intra and CLAM-Inter processes. The principle of the CLAM method is simple and easy to understand. It can effectively reduce the problem of data packet collision caused by UAVs competing for time slots, while reducing the access delay of nodes, avoiding node starvation in the network, and improving the fairness of the network. In addition, each UAV can autonomously detect the distance between it and the adjacent UAVs in real time, and synchronize its own precise positioning to the surrounding UAVs. In this way, the UAV can quickly adjust the time slot allocation according to the changes in the network topology in a timely manner to improve the efficiency of inter-UAV communication.

The invention discloses an unmanned aerial vehicle (UAV) auxiliary data collection method based on timeliness grading, and the method comprises the steps: S1, describing a UAV-user uplink scene, considering the time delay demand difference of different priority node transmission packets, and building a system model; s2, establishing a grouping time slot transmission model, on one hand, designing a probability updating mechanism; on the other hand, collision detection rules during multi-user packet collision are described. And S3, formulating an optimization problem. The problem is modeled into an integer nonlinear programming problem. And S4, modeling the integer nonlinear programming problem into a Markov decision process, and explaining a state space, an action space and reward elements. And S5, training and testing to obtain an optimized UAV trajectory and an average throughput under the trajectory. According to the invention, for a transmission environment under users with different time delay demands, the UAV track is optimized, packet collision is avoided, and efficient data collection is realized.

The invention belongs to the technical field of Internet of Vehicles control, and particularly discloses a cellular Internet of Vehicles spectrum resource allocation method under hidden terminal influence. According to the method, firstly, a data packet transmission model is provided and used for describing the probability of data packet collision caused by the fact that two or more vehicles access the same channel resource and broadcast CAM, and the model can represent the probability of data packet collision caused by interference of exposed terminals and two types of hidden terminals under different inter-vehicle distances and vehicle densities at the same time. The invention further provides an inter-data packet receiving probability model which is used for describing a time interval between two successive successful data packet receiving. In addition, the invention further designs a self-adaptive multi-agent reinforcement learning scheme used for searching for an optimal channel resource allocation strategy for each V2V link, meanwhile, a hierarchical approximation strategy iteration mechanism based on a binary tree is introduced, and through hierarchical decomposition of a state space and local search optimal strategy search, an optimal channel resource allocation strategy is provided for each V2V link. The calculation complexity of reinforcement learning training is reduced.

Techniques for network management are described herein. In a network environment, such as a utility system (e.g., an electrical grid, a water supply system, a natural gas supply system), networked devices are used to upload data to a data-collector (e.g., central office server(s)). The networked devices can be grouped. In the example of an electricity grid, networked devices (e.g., smart electricity meters) can be grouped according to a transformer to which all of the members of the group are attached. To reduce network data traffic, data packet collisions, transmission retries, and power consumption, a "spokes-meter" may be selected. The spokes-meter is configured to accept data from other members of the group and to forward that data to the data-collector. The spokes-meter acts as a relay for other members of the group.

The invention relates to multi-gateway coordination in a thermal management system. Systems and methods are provided for coordinating gateway polling in a multi-gateway sensor system, such as a sensor system implemented in a data center for monitoring thermal conditions. The system comprises: at least two subsets of sensors in communication with at least two gateways; and a controller in communication with the at least two gateways, the controller configured to implement a dynamic polling scheme to coordinate polling of the at least two gateways. In embodiments, the dynamic polling scheme includes scheduling non-overlapping time slots for polling gateways and / or intervals for polling sensors to avoid data packet conflicts.

The application provides a networking system data transmission method, a networking system and an electronic device. The method is applied to a host in the networking system and includes the following steps. First data packets sent by multiple slaves are received. When it is determined that the received first data packets meet preset data window conditions, attribute information corresponding to the multiple first data packets and the number of target slaves are obtained. Based on the attribute information in the multiple first data packets and the number of target slaves, time slices corresponding to the target slaves are determined. The multiple time slices are broadcast according to target serial number information corresponding to the target slaves, so that the target slaves send second data packets according to the corresponding time slices. According to the embodiment of the application, multiple data packets from multiple slaves are aggregated by the host, so that the uplink throughput capacity of the system is improved. Moreover, corresponding time slices can be dynamically allocated according to the attribute information of the received data packets, so that data packet collision is avoided and the transmission efficiency is improved.

The invention discloses a communication method and device based on random frequency band channel access, and relates to the field of communication. The method comprises: receiving first information from a first communication device at a first frequency band, the first information being used for indicating a request to access a channel, the first frequency band being a random access frequency band or a fixed access frequency band of the first communication device; and sending second information to the first communication equipment, wherein the second information is used for indicating that the first communication equipment is allowed to access the channel. According to the invention, the packet sending collision rate can be greatly reduced, the channel access delay of the communication equipment is reduced, and the data sending delay of the communication equipment is further reduced.

To avoid packet collisions in wireless mesh networks. [Solution] The lighting control system according to the embodiment comprises a plurality of lighting fixtures forming a wireless mesh network and a control device for controlling the lighting fixtures. The lighting fixtures transmit status packets indicating their own status information to the wireless mesh network at a transmission time determined by the control device, and transmit received packets received from other lighting fixtures to the wireless mesh network according to the timing of receipt.

A method of avoiding data packet collisions includes initiating, by a first electronic device, a Hands-Free-Profile (HFP) call event between the first electronic device and a third electronic device through a second electronic device, wherein the second electronic device and the third electronic device communicate using an extended Synchronous Connection-Oriented (eSCO) communication link during one or more pre-defined eSCO time intervals, establishing, by the first electronic device, a Bluetooth Low Energy (BLE) communication link with the second electronic device while the HFP call event is active, and in response to the establishing of the BLE communication link, configuring, by the first electronic device, one or more BLE time intervals to exchange one or more BLE data packets between the first and second electronic devices. The BLE time intervals are distinct from the eSCO time intervals to avoid the data packet collisions.

The invention relates to a method and a system for optimizing Age of information (AoI) of uplink transmission of a data packet under a pure Aloha protocol in LoRa, and aims to improve the timeliness of the data packet, optimize the quality of data transmission and reduce information delay and system response time. Comprising the following steps: establishing a system model for collision and retransmission in a LoRa data packet transmission process under a pure Aloha protocol, and analyzing the possible influence of data packet retransmission on LoRa security. According to the model, channel selection, SF (Spreading Factor) setting and possible data packet collision conditions in the LoRa network are considered. By analyzing the transmission effects of different channel and spreading factor combinations, the collision probability of the data packet in the transmission process and the influence of the collision probability on the AoI can be calculated. In order to realize optimal channel and SF selection, a deep reinforcement learning method is adopted, a training model is constructed to dynamically select an optimal transmission strategy, and collision events and retransmission times are reduced through intelligent adjustment of channel selection and spreading factors, so that the timeliness of data packets and the security of the LoRa network are improved. The method is suitable for various LoRa Internet of Things applications, including but not limited to the fields of intelligent cities, environment monitoring, intelligent agriculture, intelligent logistics and the like, and particularly has important practical value for Internet of Things application scenes needing high timeliness and real-time response.

The present application relates to a method for optimizing the Age of Information (AoI) of data packet uplink transmission under the pure Aloha protocol in LoRa, aiming to improve the timeliness of data packets, optimize the quality of data transmission, and reduce information delay and system response time. It includes: a system model for collision and retransmission of LoRa data packet transmission process under the pure Aloha protocol is established, and the possible impact of data packet retransmission on LoRa security is analyzed. The model takes into account channel selection, spreading factor (SF) setting and possible data packet collision in LoRa network. By analyzing the transmission effect of different channel and spreading factor combinations, the collision probability of data packets in the transmission process and its impact on AoI can be calculated. In order to achieve the optimal channel and SF selection, the present application adopts the method of deep reinforcement learning, constructs a training model to dynamically select the best transmission strategy, adjusts the channel selection and spreading factor intelligently, reduces the collision events and the number of retransmissions, and thus improves the timeliness of data packets and the security of LoRa network. The present application is suitable for various LoRa Internet of Things applications, including but not limited to smart city, environmental monitoring, intelligent agriculture, intelligent logistics and other fields, especially for Internet of Things application scenarios that require high timeliness and real-time response, and has important practical value.

A communication rate optimization method and system for intelligent circuit breaker (PCB) data acquisition is disclosed. A master-slave 485 serial communication network architecture is adopted, with the master station communicating with multiple slave PCBs via an edge gateway. First, the broadcast parameters for the PCB data acquisition task are determined. The master station's edge gateway sends a call address command, and the slave stations respond according to priority, calculating communication parameters based on the number of devices and message length. The master station evaluates the overall data transmission time by calculating the response time interval and determines whether the communication efficiency is optimal. A communication rate optimization mechanism is established, with the master station dynamically adjusting the safety factor to balance stability and transmission efficiency. Specifically, this is achieved by detecting data packet conflicts, adjusting the safety factor calculation method, and optimizing the slave station response priority based on device alarm status. This invention enables one-question-multiple-response communication, automatically adjusting communication efficiency, and improving the efficiency of serial communication data acquisition.

The invention relates to a communication queuing sending method based on a LoRa bus, and belongs to the technical field of communication, and the method comprises the steps: enabling a plurality of slave modules to send a data sending request to a main module after completing the data collection; after receiving the data sending requests of the slave modules, the master module queues the data sending requests of the slave modules and allocates corresponding sending time windows; and the main module sends the data acquired by the slave module according to the distributed sending time window. Before the slave modules send the data, the slave modules send the data sending requests to the master module, the master module queues the data sending requests of the slave modules and distributes the corresponding sending time windows, data packet collision can be effectively avoided, and communication efficiency and reliability are improved.

This application discloses a scheduling method, scheduling device, electronic device, and computer program product. The method, applied to an access point (AP), includes: publishing preset configuration parameters to each associated station (STA), the preset configuration parameters being used to prohibit the STA from actively competing for the channel within a preset time period, the preset time period including multiple sub-time periods, each sub-time period including a first stage and a second stage; in the first stage, acquiring the remaining load information of each STA; determining a target STA based on the remaining load information of each STA, the target STA being: a STA whose remaining load, as indicated by the remaining load information, meets preset load conditions; and in the second stage, scheduling the target STA to send uplink packets. This application's solution can rationally schedule communication between the AP and STAs, reducing packet collisions between different devices.

According to the control method and system for the water valves in the farmland irrigation area, the medium, the program and the electronic terminal, a gateway sends broadcast commands to all the water valves in the same irrigation area at the same time through a control channel, a traditional low-efficiency mode of sending commands one by one is replaced, and parallel wakeup and action execution of the water valves are achieved. Meanwhile, the system is provided with an independent control channel and an independent feedback channel, and the control channel and the feedback channel work at different frequencies, so that command issuing and state reporting can be synchronously carried out and do not interfere with each other. Based on this, the water valve can autonomously report the state through the feedback channel without waiting for gateway polling after executing the action. In order to avoid uplink signal conflicts among the water valves, different waiting durations are set for each water valve, so that the water valves send state information in sequence in a time-sharing manner, and data packet collision is thoroughly avoided while the communication real-time performance is ensured.

Methods, systems, and devices for exchanging subband puncture information for network throughput management are described. In some examples, an access point may receive an action frame from a station device, which includes a disabled subchannel bitmap subfield that indicates subband puncturing information based on localized interference detected by the station device. The access point may then determine a negotiated subband puncturing pattern that considers both the station device's and the access point's detected subband puncturing information. Subsequently, the access point may transmit an action frame back to the station device containing this negotiated subband puncturing pattern. Both the access point and the station device may adhere to this negotiated subband puncturing pattern for future unicast frame exchanges, thereby enhancing network efficiency by effectively managing packet transmissions and reducing packet collisions.

Certain aspects of the present disclosure provide techniques for collision mitigation in sidelink. A method that may be performed by a user equipment (UE) includes measuring channel busy ratio (CBR), estimating a number of UEs using the channel, estimating a congestion level based on the CBR and the estimated number of UEs. A method that may be performed by a sidelink UE includes determining a semi-persistent scheduling (SPS) resource reservation including first subframes, determining second subframes for generated packet transmission, determining to skip transmission in the second subframes, listening during the second subframes for another sidelink UE's transmission, and determining whether to reselect resources. Another method includes listening during a first subframe for another sidelink UE's transmission, detecting the transmission collides with a scheduled transmission resource for the sidelink UE based on an amount of frequency resource overlap, and determining to reselect resources.

The present invention discloses a method, device, and medium for processing wireless communication data packet loss, belonging to the field of wireless communication technology, and is used to solve the technical problem that existing LoRa wireless communications are susceptible to co-frequency interference, resulting in mutual air packet collisions between gateways corresponding to multiple terminal devices at the same frequency. The method includes: obtaining the device number of the device end according to the usage scenario of the server end; performing gateway time calibration on each data according to the device number sent by the server end to determine the data transmission time corresponding to the server end; screening the overlapping range of the regional range according to the data transmission time and the regional range of several gateways to determine the data communication status of the gateway; and judging the response of the device end according to the device number and data communication status to obtain a response result, so as to sequentially send the data in the server end.