290results about How to "Reduced probability of outage" patented technology

The invention discloses a heartbeat testing method, applied in a network device with service net mouth, comprising that: the network device periodically transmits heartbeat information to a testing opposite terminal through a heartbeat testing port, receives heartbeat response returned by the testing opposite terminal, selects a service net mouth free of service, when the heartbeat testing terminal does not receive the heartbeat response of the testing opposite terminal, transmits the heartbeat information to the testing opposite terminal through selected service net mouth; it is judged that, whether the selected service net mouth receives the heartbeat response of the testing opposite terminal, if true, determining the test opposite terminal is normal; otherwise, determining the testing opposite terminal. The invention also discloses a heartbeat testing device. According to the invention, judging correct degree of the tested state is advanced.

The invention discloses a routing optimization method for a vehicular self-organized network based on connection probabilities. The method comprises the following steps that: a gateway, where a source node is, calculates connection probabilities on various lanes in a corresponding network at first; then, a path having the highest connection probability is selected through intercommunication between gateways; the id number of the gateway in the selected path is recorded and added into the head part of a data packet to be transmitted; practical transmission of the data packet is waited; and a practical data packet forwarding process is carried out after the path is selected. According to the invention, the next-hop selection mechanism based on the priority is provided; compared with the original greedy algorithm, the back-off rate is reduced; and the routing effectiveness is greatly increased.

The invention discloses an optimal power allocation method for reducing the outage probability in the coding cooperation communication of the wireless communication field, and mainly solves the problem of higher outage probability in the system based on the prior average power allocation method. The optimal power method comprises the following steps: the channel statistical information of an original node to a relay node and a target node as well as the relay node to the target node are respectively estimated after the information from the original node and the relay node is received by the target node; subsequently, the lowest outage probability is taken as a target by the target node, an optimal power allocation coefficient is calculated based on an optimal power allocation formula according to the estimated channel statistical information, and the power allocation information is sent to the original node and the relay node by utilizing a feedback channel; the feedback information is received by the original node and the relay node which send the information at the allocated power respectively. The optimal power allocation method can remarkably reduce the outage probability of the coding cooperation communication, and ensure the lower complexity for the calculating method of the power allocation coefficient, therefore, the method can be used for reducing the outage probability of the coding cooperation communication system and ensuring the communication quality.

The invention relates to a network data transmission method for a distributed opportunistic relay, belonging to wireless network transmission technical field. In bidirectional wireless network transmission, a plurality of candidate relay nodes select one relay node to participate in cooperation through distributed selection count; the originating nodes decide whether to adopt the direct transmission mode or the relay transmission mode, which satisfies the quality of service of the system and meanwhile reduces power consumption. The relay nodes judge whether to forward the data and calculate the optimized transmitted power of the data and send the data from a plurality of originating nodes to a plurality of destination nodes at the same time after conducting network coding to the data. The destination nodes receive the data through maximum likelihood method and maximum ratio combining method at the receiver terminals and decode the received information. The network data transmission method can carry out combinatorial optimization to the selection, the network coding and the power splitting of the relay nodes through distributed control mechanism under the condition that only part of the information of the channel status is provided, and can be effectively used in an energy-effective bidirectional-transmission wireless network.

The classification of service (CoS ) is made on 802.16 network. Combining the feature of 802.16 supporting QoS communication service, band width is distributed to different class service to ensure the service quality of speech communication. Different class service has different size band width and different priority. The service in high priority is permitted to occupy bandwidth used by service in low priority. Call in mobile switch process has higher priority, and is distributed bandwidth from pre-reserved bandwidth. Emergency call, switch call and switch QoS data service are set into four FIFO queues. When there is bandwidth is released, the bandwidth is distributed to service in these four queues based on different priority. When newly generated ordinary call and data service can not get bandwidth, they will be rejected to access the network.

The invention discloses a dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology, and relates to a dynamic cooperative relay transmission method.The purpose of the invention is to solve the problems of base station slot resource waste of the existing cooperative transmission scheme based on the power domain non-orthogonal multiple access technology and low edge user reliability of the direct relay cooperative transmission scheme based on the power domain non-orthogonal multiple access technology. The process is: in a direct transmission phase, a base station S broadcasts a superposition coding signal xs of information x1 required by a central user U1 and information x2 required by an edge user U2, performing: the U1, a U3, and a relayR respectively decode x2 received signals by adopting a least mean square error algorithm, and then U1 decodes x1 using a serial interference cancellation algorithm; in a cooperative transmission phase, the S broadcasts x2 information required by the U3, the R broadcasts x2, and the U1 broadcasts x2 according to a dynamic protocol, respectively: U3 decodes x3 the received signals using MMSE; andthe U2 decodes x2 the received signals using maximum ratio combining and MMSE. The method is used in the field of wireless cooperative relay transmission.

The invention relates to a method for adaptively adjusting the transmitting power of an atmospheric optical communication system according to a channel state. The method is characterized by comprising the following steps: sending and receiving information by using a transmit-receive single-mode optical fiber coupling laser communication transceiver, and forming a bidirectional atmospheric optical communication system by using two transmit-receive single-mode optical fiber coupling laser communication transceivers having the same structure. The bidirectional atmospheric optical communication system can adaptively adjust the peak transmitting power of laser pulse according to the instantaneous channel state, namely, in the case of optical signal fading, the peak transmitting power of the laser pulse is increased at a transmitting end to compensate the negative impact generated by atmospheric turbulence.

The invention provides a self-adapted multi-beam forming and beam switching method of millimeter wave high-speed rail train-ground communication. The self-adapted multi-beam forming and beam switchingmethod of the millimeter wave high-speed rail train-ground communication first performs multi-beam forming, then performs multi-vehicle-mounted mobile relay node beam allocation, then performs beam switching, then establishes a capacity optimization problem, and finally activates an optimal beam. The self-adapted multi-beam forming and beam switching technique of the millimeter wave high-speed rail train-ground communication adopted by the invention can not only significantly increase the capacity of a high-speed rail wireless communication system, but also reduce the communication interruption probability of the entire system.

The invention relates to a visible light/radio frequency hybrid cooperative communication method based on wireless energy harvesting and non-orthogonal multiple access, applied to a user cooperative communication system of visible light/radio frequency communication. The system comprises an LED light source and a user group, users in an area closer to the LED light source are near users; and otherusers in the user group are remote users. The method comprises the following steps; (1) within a first stage T time, the near users convert light signals emitted by the LED light source into electricenergy for storage; within a second stage 1-T time, the near users receive the light signals emitted by the LED light source, demodulate the light signals emitted by the LED light source, and demodulate information of the near users and the information of the remote users; and (2) the near users send the demodulated information of the remote users to the remote users through radio frequency signals by using the stored electric energy. In the communication method provided by the invention, the energy consumption problem of the user equipment is also considered, and an energy harvesting moduleis added, thereby being green and environmental friendly.

The invention discloses a relay auxiliary information and energy transmission method based on time slot switching. According to the relay auxiliary information and energy transmission method disclosedby the invention, a SWIPT relay with an energy collection function is imported, and a scene and mathematical model of the proposed relay auxiliary information and energy transmission method based ontime slot switching is provided. The system interruption performance and the energy efficiency performance are analyzed. The influence of a time slot switching factor on the SWIPT interruption performance and the energy efficiency is studied. Studies show that when a high-time-slot switching factor meets the performance requirements of the energy efficiency, a relatively low interruption probability can be obtained. Meanwhile, the influence of the source transmitting power on the SWIPT interruption performance and the energy efficiency is analyzed, and the studies show that, if the source transmitting power is high, the relatively low interruption probability can be obtained, but the energy efficiency is too low. In order to balance the interruption performance and the energy efficiency, signals cannot be transmitted at the maximum power, but should be transmitted at the 'optimal' power. By adoption of the relay auxiliary information and energy transmission method disclosed by the invention, the requirements of a wireless energy-carrying network for the interruption performance and the energy efficiency are effectively satisfied, and the balance between information transmission andenergy collection is achieved at the same time.

The invention relates to a mobile edge computing network resource allocation method based on full duplex relay, and belongs to the field of mobile edges. The method comprises the following steps: constructing an uplink mobile edge computing network model assisted by a full duplex relay; analyzing transmission characteristics of the constructed system, jointly optimizing a user matching strategy, auser task unloading coefficient and transmission power when constraints such as user computing task delay, user outage probability, user maximum computing power and maximum transmitting power are met, and establishing a system total energy consumption minimization optimization problem; decomposing an original non-convex optimization problem into two deterministic convex optimization sub-problemsto be solved by utilizing a worst criterion and an alternate iteration method. According to the method, the pressure of executing tasks with large calculation data volume and low time delay request bythe user can be effectively relieved, the service quality of the user is improved, and compared with the prior art, the consumption of executing the calculation tasks can be effectively reduced, theinterruption probability of the system is reduced, and the stubborn performance of the system is improved.

The invention discloses a terminal D2D (device-to-device) communication method based on a multiple-input multiple-output cooperation relay. In the method, multiple antennas and a relay technology are introduced to a D2D system, so that the rate and interruption probability of the D2D system are improved; in an IMT-Advanced (international mobile telecommunications-advanced) system, if a pair of cellular users need terminal D2D communication, but the distance between them exceeds an effective distance of D2D communication, or the quality of a channel link between them cannot reach requirements, in case that a large number of idle UE users exist in a district, by taking an idle mobile terminal as a relay, the pair of cellular users are assisted in D2D communication; a starting end of a pair of terminal D2D communication cellular users is marked as D1, a receiving end is marked as D2, and the relay is marked as R; when the D1 communicates with the Rs, the D1 reuses frequency resources of communication between the cellular users in the district and base stations, and at the moment, the D1 and the R form a pair of D2D communication.

The embodiment of the invention provides a network switching method. The network switching method comprises the steps that after a first network is connected, at least two first signal values of the first network are acquired, the average value of the at least two first signal values is calculated, and the average value of first signals is obtained; when the average value of the first signals meets a preset second network connecting condition, the control instruction for connecting a second network is sent; at least two second signal values of the first network are acquired, the average value of the at least two second signal values is calculated, and the average value of second signals is obtained; when the average value of the second signals meets a preset first network disconnecting condition, the control instruction for disconnecting the first network is sent. A method of averaging by multiple metering is used for conducting signal stability assessment on the network, switching misjudgment and ping-pong effect of repeated switching caused by the mobility of a terminal and the instability of network wireless signals are avoided, and the probability of service interruption is effectively lowered. The invention further provides a network switching device and a mobile terminal.

The invention discloses a resource distribution and power distribution method for a cellular multi-cell orthogonal frequency division multiple access (OFDMA) system. The resource distribution and power distribution method is characterized by comprising the following steps of: initializing a base station, establishing a bandwidth distribution scheme of each cell, determining a sub-carrier distribution scheme of users; distributing sub-carrier power to each cell; calculating and transmitting an interference cost factor of the neighboring cell; updating the interference cost factor transmitted to the cell by the neighboring cell; executing the next period of bandwidth and power distribution; and circulating the steps. In the distribution method, each base station can determine the transmitting power independently only with the limited cooperation existed among the base stations and through the share of the interference cost factor among the base stations, so that the interference level among the cells can be effectively controlled and the performance of the system can be optimized. Furthermore, a large burden is not brought into the information transfer among the base stations, so the distribution method has high practicability.

The invention provides a relay selection and power distribution method for an amplifying-and-forwarding collaborative network. The amplifying-and-forwarding collaborative communication network is built and comprises a source node S, a destination node D and N backup relays from R1 to RN. A transmission process is divided into two phases, wherein in the first phase, signals x are broadcast to all the backup relays through the source node S; in the second phase, best relay selection and power distribution are carried out, and information is forwarded to the destination node through the selected best relay. According to the method, the source node does not need to know instant channel state information of all channels; only after the backup relays feed back instant channel state information of one hop of two hops of links where each backup relay is located, can the backup relays be selected, feedback cost is little and the method is easy to achieve.

The invention relates to a power allocation method to reduce interruption probability with an AF-DSTC cooperative communication protocol in the wireless communication field, the method comprises the following steps: after receiving a message from a source node, cooperative nodes calculate the selection determinate factor SDP of the source node and determine whether the source node can participate a second communication process by the selection status according to the selection determinate factor SDP. The cooperative nodes feed back the SDP factor and the selection status to the source node. The source node allocates power to the cooperative nodes in accordance with messages fed back and broadcasts the power allocation information. The chosen cooperative nodes repeat the source information to target nodes by the allocated power. With low complexity in calculation, the invention can reduce dramatically the interruption probability of AF-DSTC cooperative communication and only the average value of the channel gain from a cooperative node to a target node is required.

The invention discloses a through terminal-communicating method based on network coding. The method comprises the following steps of sending a conversation request to a base station by a D2D (Door to Door) user, and searching for the position of a conversation object by the base station; judging the conditions of two D2D users for meeting through terminal communication, allocating the resources of a farther cellular user to the D2D users for multiplexing use, allocating relay nodes for the edge distances of the D2D users positioned in D2D communication by the base station, and multiplexing a spectrum resource through the relay nodes by adopting the network-coding modes of three time slots to finish the D2D communication. The system capacity is effectively increased, and the outage probability is effectively reduced.

The invention relates to a space-time block coding unmanned aerial vehicle relay communication flight path planning method which comprises the steps of: establishing a space-time block coding unmanned aerial vehicle relay communication system model, which comprises the sub-steps of: at a moment t, transmitting signals in a space-time block coding mode at two continuous time slots at a mobile access node under a certain power by two transmitting antennas; by an unmanned aerial vehicle, receiving signals from the mobile access node at a first time slot and at a second time slot, and forwarding the received signals under a certain power; and receiving signals transmitted by the unmanned aerial vehicle at third and fourth time slots by a base station node, and carrying out related merging processing on the received signals by a receiver of the base station node; and establishing a flight path planning model of an unmanned aerial vehicle relay communication system, which comprises the sub-steps of: obtaining ergodic capacity of the unmanned aerial vehicle relay communication system at the moment t; respectively obtaining a distance from the mobile access node to the unmanned aerial vehicle and a distance from the unmanned aerial vehicle to the base station node; and establishing the flight path planning model of the unmanned aerial vehicle relay communication system. According to the space-time block coding unmanned aerial vehicle relay communication flight path planning method disclosed by the invention, reliability of transmission of point-to-point unmanned aerial vehicle relay communication link is effectively improved.

An arrangement of M signal generators in a global navigation satellite signal baseband chip for obtaining a sequential chip correlation array is provided. The sequential chip correlation array generates M×N code bit sequences, M in-phase and M quadrature-phase carrier mixed signals. The M signal generators are arranged consecutively. A programmable parameter is created for providing a spacing of T_C between each N code bit sequences. A first carrier and code generator is provided within each signal generator for generating an in-phase and a quadrature-phase component of a first carrier signal, and N code bit sequences. The first carrier and code generators within adjacently arranged signal generators are programmed with same code chip offset, different carrier signal frequency, different code frequency, and different code phase offset. M in-phase and M quadrature-phase carrier mixed signals, and N code bit sequences are generated by the M signal generators based on the programmable parameter.

A transmission method of Ethernet passive optical network comprises the information transmission and switching between the switching side and user side, wherein the method comprises the following steps: a. receiving user operation by the front panel of network management; b. processing the user operation input by a core module of network management, and processing differently according to the processing result, transmitting the operation to a core module of device through the communication function after switching a certain format if the operation is legal; and if the operation is illegal, sending out alarm for reminding and discarding the operation; c. receiving the data transmitted by the core module of network management by the core module of device through the communication function, processing and analyzing the data for obtaining the result, and applying the analysis result to the specific collocation; and d. feeding back by the core module of device to the network management module according to whether the practical application is successful.

The invention requests for protecting a uniting switch method based on speed self-adaption in an isomerism cognition radio network. The invention relates to the field of wireless communication. Due to the fact that the switch problem is produced by the movement of the position of a secondary level user, the invention provides the uniting switch method of frequency spectrum broker auxiliary selecting network and secondary level user terminal controlling switch. Attribute weight is obtained based on the layer analysis method by the frequency spectrum broker on a network side, thus the network is selected. The switch controlling method of the speed self-adaption is provided on a terminal side, thus the switch from an original network to the target network is controlled. Different switch judgment threshold methods are provided according to different switch types. According to the uniting switch method based on speed self-adaption in an isomerism cognition radio network, a suitable network can be selected according to business requirements and network conditions of the secondary level user. Switch is well controlled. Switch times and suspending probability of the secondary level user are reduced. Switch performance of the secondary level user is improved.

The present invention provides an optimal power distribution and relay deployment method of a full duplex bidirectional decoding forwarding relay based on a channel statistics characteristic. The method comprises the following steps of establishing a bidirectional full duplex relay communication system; using a terminal node to send the state information to a relay node, wherein the state information comprises the emission power information and the self-interference information; after the relay node receives the state information of the terminal node, selecting an optimal power distribution scheme to send a signal; and selecting the deployment position of the relay node according to an optimal power optimization scheme. According to the present invention, and according to a deployment mechanism of the relay node, a power distribution mechanism of the relay node enables the interruption probability of a system to be reduced effectively, the problem that the interruption probability is overhigh in a full duplex system is solved, and the stability of the system is improved, thereby improving the service quality of the terminal node.