30results about How to "Optimize transmission delay" patented technology

The invention discloses a method for realizing the MAC protocol of a vehicular network based on Q learning. In the method, the vehicle nodes use the Q learning algorithm to continuously learn interactively with the environment through repeated trial and error in the VANETs (vehicle ad hoc network) environment. According to the VANETs environment The given feedback signal (reward value) dynamically adjusts the competition window (CW), so that the node can always access the channel with the best CW (that is, the CW value selected when the reward value obtained from the surrounding environment is the largest), Ultimately, the goal of reducing data frame collision rate and transmission delay and improving the fairness of nodes accessing channels is achieved.

The embodiment of the invention relates to a distribution method of network flow. The distribution method comprises the following steps of: establishing a plurality of optional routing paths between a source node and a destination node of a network, and initially distributing the network flow between the source node and the destination node to one or more optional routing paths; according to the network flow initially distributed to the optional routing paths, determining the initial optimal routing path in the optional routing paths by a hopfield neural network algorithm, and distributing the network flow between the source node and the destination node to the initial optimal routing path; and according to the network flow initially distributed to the optional routing paths and the network flow distributed to the initial optimal routing path, adjusting the network flow distributed to the optional routing paths by an FD flow deviation algorithm until the network transmission time delay meets the predetermined requirements. In the invention, the multiple optional routings are established between the source node and the destination node, and the hopfield neural network algorithm andthe FD algorithm are combined for adjusting the service load of each link in the network, thereby adjusting the flow distribution and optimizing the network transmission time delay.

The invention discloses a portable fast pulse generating device and a manufacturing method thereof, comprising: a high-frequency PCB circuit board, a main loop structure, a secondary loop structure, a power supply and a load; both the primary loop structure and the secondary loop structure are built on a high-frequency PCB circuit board; the main circuit structure includes the main capacitor C 1 , mercury switch and filter module; all components of the main circuit structure are in a straight line; the secondary circuit structure includes a high-voltage DC voltage source and a charging resistor R 1 ; High voltage DC voltage source and charging resistor R 1 Used to form the main capacitor C 1 The charging circuit; the power supply is used for the power supply of the high-voltage DC voltage source; the power supply is also used for the triggering of the mercury switch; the load is connected to the high-frequency PCB circuit board through the SMA plug and the SMA socket. The invention miniaturizes the signal source used to generate the electromagnetic wave for calibration, and can meet the calibration requirement of the ultra-high frequency sensor for partial discharge measurement under actual working conditions on site.

The invention discloses an MAC-layer channel access method based on multi-agent Q learning in vehicular communication. The method comprises the steps that: in a VANETs environment, each vehicular node constructs the joint state-action pair mapping relationship and the combined strategy itself; then, whether a new vehicular node is added into a VANET network or not is judged; if the new vehicular node is added into the VANET network, the new added vehicular node rapidly obtains the action space, the state space and the reward function through transfer learning; hereafter, each vehicular node updates the joint state-action pair relationship and the combined strategy itself; if the new vehicular node is not added into the VANET network, whether a current vehicular node has data needing to be sent or not is judged; if the current vehicular node has the data needing to be sent, the action strategy solution satisfying correlated equilibrium can be determined according to a eCEQ algorithm; an action enabling a multi-agent system to achieve correlated equilibrium finally is selected from an action set; a CW value is determined; and, the vehicular node is accessed to a wireless channel to send data according to the CW value. By means of the MAC-layer channel access method based on multi-agent Q learning in vehicular communication disclosed by the invention, the data sending success probability is increased; the withdrawal time is reduced; and the data packet receiving rate, the end-to-end transmission delay problem and the like can be effectively improved.

The embodiment of the invention discloses a transmission optimization method of an AP network, a first access point receives a call message sent to a second user by a first user; the first access point acquires the communication address of a second access point belonging to the second user; and the first access point establishes a direct-connecting transmission tunnel between the first access point and the second access point to enable the first user to communicate with the second user by the direct-connecting tunnel. In the embodiment of the invention, the transmission path of the AP networkcan be optimized, the transmission delay is improved, the bandwidth bottleneck of a core network is eliminated and meanwhile, the cost of the core network is lowered.

The present invention relates to a method for configuring parameters of a listen-before-talk frame-based device, wherein the base station configures the number of FBE LBT executions N for the terminal, or configures the number of FBE LBT executions N and the length of the FBE LBT time slot for the terminal; When performing uplink resource allocation for the first time, the number of times the terminal executes FBE LBT does not exceed the number of times N of FBE LBT executions; the terminal configures FBE LBT time slots based on the length of the FBE LBT time slot, and performs Perform FBE LBT channel detection in . The invention satisfies the time delay requirements of different services and the energy consumption requirements of different terminals by rationally configuring FBE LBT parameters for the terminals, and can adapt to complex and dynamic interference environments, thereby improving the transmission performance of the system.

A source position privacy protection method based on multi-phantom node strategy comprises the steps of: initializing a network, constructing a node triple, alternatively selecting phantom nodes, transmitting the source node-phantom node based on a sector area division, and keeping away from a visible range to transmit the phantom node-base station. By using the multi-phantom node idea, the method generates two phantom nodes at the same time to form a node triple; any two nodes of the node triple can be used as the alternative phantom node of the third node; moreover, in the working stage of the route, the source data packet is transmitted by combining the sector area division method and the visible range avoiding strategy; thus, the security of the source node is effectively increased by keeping away from the visible range of the source node; and, the transmission time delay and the energy consumption of the router are well controlled at the same time.

The invention proposes a protocol sequence channel access algorithm based on carrier interception. The algorithm comprises the steps: firstly distributing a binary protocol sequence to each network node, and reading the sequence values sequentially; secondly transmitting a data group with a non-fixed length when the current sequence value is one, and determining the moment of keeping silent according to a channel interception result when the current sequence value is zero. Compared with a conventional protocol sequence channel access mechanism, the method is more suitable for a network scene comprising various types of data businesses. Moreover, the time delay performance is remarkably superior to a p-persistence CSMA channel access mechanism.

The invention discloses a power allocation method for wireless broadcast multicast layered modulation. In the method, a transmitting end allocates power lambda P to an elementary stream, allocates (1-lambda)P to an enhanced stream and transmits the elementary stream at a first user selected rate pb and the enhanced stream at a second user selected rate pe every time, until the user rate of receiving the elementary stream is presumed to be more than or equal to a preset rate H, wherein the lambda is a power allocation factor and is more than 0 and less than or equal to 1, and P is total power for transmitting the elementary stream and the enhanced stream; and the value of the lambda is determined to be the maximum value of the lambda, wherein Cu is throughput of the enhanced stream at the transmission finishing moment, KB is system time delay at the transmission finishing moment, Cu and KB are expressions of the lambda, and H is more than or equal to 90 percent. The invention provides an optimal power allocation method, and the system performance optimization is realized.

The invention provides a device for dynamically allocating bandwidth of an operation management control interface. The device comprises a software configuring module for configuring an operation management control interface transmission container OMCI TCONT as a Non-Assured type TCONT, an information configuring module for configuring the OMCI bandwidth mode and the OMCI interaction mark, and a bandwidth calculating module for calculating the OMCI bandwidth. The invention further provides a method for dynamically allocating bandwidth of the operation management control interface. By the device and the method provided by the invention, good uplink bandwidth utilization and uplink OMCI information transmission delay can be obtained.