43results about How to "Reduce the ping-pong effect" patented technology

The invention discloses a vertical switching method based on dynamic weight optimization in a heterogeneous wireless network. Aiming at the problems that the mobility of terminals and the time-varying characteristics of network states lead to dynamic performance, different service types have personalized requirements for networks, and poor vertical switching performance is caused, performance optimization is carried out from the following aspects: firstly, separately calculating subjective weights and objective weights of network parameters by using an analytic hierarchy process (AHP) and an entropy evaluation method, and initializing the combined weights based on a linear single objective optimization (SOP) theory; secondly, introducing weight adjustment factors, and dynamically adjusting the weight of each network parameter to adapt to the dynamic change performance of network conditions; and finally, selecting an optimum access network by adopting utility functions with adjustable switching thresholds based on the personalized requirements of a terminal. Experimental results show that by adopting the vertical switching method disclosed by the invention, the switching blocking rate and call drop rate of the terminal can be effectively reduced, unnecessary switching can be reduced, 'ping-pong effects' can be reduced, and the comprehensive performance of vertical switching can be improved.

A cyber-foraging network system which automatically and intelligently detects, selects, and connects to a wireless networking access point utilizing data obtained from its own environmental observations as well as from a robust wireless networking context aggregation/interpolation service.

A handover determination apparatus and method in an overlay wireless network environment is provided. A handover situation is detected with consideration of a user environment including user requirements and service efficiency, as well as received signal strength of a wireless network, and an unnecessary handover due to a temporary condition change is prevented by use of a dwell timer. Accordingly, a seamless optimized wireless network service can be provided to a user regardless of a location of the user.

The invention requests for protecting a type-II fuzzy vertical handoff method based on sojourn time prediction in a vehicle heterogeneous network. In the vehicle heterogeneous network, aiming at the problem that the handoff performance is reduced due to the facts that the sojourn time of a vehicle terminal is too short and the fuzziness and the randomness simultaneously exist in judgment parameters, influence of the sojourn time on the handoff performance is considered. When handoff judgement is carried out, the sojourn time of the terminal in various candidate networks is predicted at first;then, a corresponding type-II subordinating degree function is designed according to fuzziness and randomness factors in the sojourn time, the available bandwidth and the user access fee; furthermore,a type-II fuzzy inference system is constructed; and finally, an optimal handoff network is selected according to the system output. Experimental results show that: due to the fuzzy vertical handoffmethod disclosed by the invention, the average handoff time, the handoff failure rate and the ping-pong handoff time can be effectively reduced; and the system throughput is improved.

The invention discloses a heterogeneous network switching management method in a fixed-mobile convergence network environment. Communication network field, the method comprises the following steps: acquiring network attribute information of each currently available network, a weighting weight set by a user terminal for each service, and a demand weight of each service for each network; the methodcomprises the steps of determining a current service in a user terminal; performing matrix operation based on the network attribute information, the weighting weight and the demand weight; determininga utility value of each network relative to the current service according to an operation result; sorting the determined utility values according to the determined utility values; determining a network suitable for the current service according to the sorting result; according to the method, the user terminal is switched to the target network according to the switching threshold, the switching threshold is determined according to the moving speed of the user terminal, and the mobile terminal cannot be switched back and forth when the network signal strength changes drastically, so that the ping-pong effect is effectively reduced.

The invention discloses a heterogeneous wireless network selection method based on an intuitionistic fuzzy number and TOPSIS. The method comprises the following specific steps: S1, acquiring a targetnetwork attribute and a current service type; S2, constructing a target decision matrix according to the obtained target network attribute parameters, and performing normalization processing; S3, constructing intuitive fuzzy analytic hierarchy process models under different service types, and obtaining corresponding network attribute weight matrixes; S4, performing simple multiplication weightingon the obtained network attribute weight matrix and the target decision matrix to obtain a weighted decision matrix; and S5, sorting the weighted decision matrixes by using a TOPSIS method, and switching by taking an optimal result as a final target network. According to the method, semantic importance degree expression is carried out by adopting intuitionistic fuzzy numbers, and uncertainty and fuzziness can be expressed more richly and accord with reality compared with common fuzzy numbers, triangular fuzzy numbers and the like; and the network attribute weight is calculated based on the intuitionistic analytic hierarchy process model, and the optimal selection of the network is realized.

The invention requests to protect an intelligent access method for comprehensive benefit maximization in a heterogeneous wireless network, and provides an intelligent access algorithm for comprehensive benefit maximization in order to solve the problems of frequent access and lack of access strategy adjustment according to the moving speed of a user in a current access algorithm in the heterogeneous wireless network. The method comprises: firstly, calculating the maximum transmission rate of a user according to the received signal strength and the available bandwidth of the user and using themaximum transmission rate as the current benefit; secondly, obtaining the transmission rates of the user at the next several moments through a prediction method, and taking the transmission rates as long-term benefits in combination with a weight decreasing method; and finally, combining the current benefit with the long-term benefit according to the moving speed of the user. Experimental resultsshow that the access frequency can be effectively reduced, the system throughput is improved, and the method is suitable for user access at different moving speeds.

The embodiment of the invention discloses a vertical handover method and apparatus in a visible light and Femto heterogeneous network. According to a bankruptcy credit distribution model in a cooperative game and a size of each parameter of each network, a weight coefficient of service providing capacity corresponding to each parameter of each network is determined, and according to a current service type of a user, by applying an analytic hierarchy process, a weight coefficient of an importance degree of each parameter for the current user is determined; and according to the weight coefficients of the service providing capacity and the weight coefficients of the importance degrees, weight coefficients of comprehensive performance of two networks are determined, the network of which the comprehensive performance has a greater weight coefficient is used as a target network, and when a network currently accessed to is not the target network, the network is handed over to the target network. The apparatus comprises a monitoring module, a calculating module, a locking module, and a decision handover module. According to the vertical handover method and apparatus in the visible light and Femto heterogeneous network, which are disclosed by the invention, continuity of data transmission is ensured, a ping-pong effect caused by frequent handover is reduced, service requests of the user are homogenized, and channel resources are reasonably distributed.

The invention discloses a method and system for outer cell reselection of a transmission mode multicast single frequency network. The method comprises a first step of judging whether a cell is a transmission mode multicast single frequency network inner cell while judging whether to add the cell to a target set, entering a second step if the cell is not the transmission mode multicast single frequency network inner cell, and entering a third step if the cell is the transmission mode multicast single frequency network inner cell; the second step of starting the transmission mode multicast single frequency network outer cell reselection process; and the third step of starting the transmission mode multicast single frequency network inner cell reselection process. According to the method and system for outer cell reselection of the transmission mode multicast single frequency network, transmission mode multicast single frequency network reference signals are subject to diversity reception. Mobile users can accurately judge channel quality by measuring the quality conditions. The mobile users improve the resource utilization rate by delaying channel switching, the judging accuracy of a target cell is improved, and accordingly the ping-pong effect is reduced. The cell can be added to the single frequency network, multicast services are transmitted through multicast channels, radio resources are saved compared with unicast, and the continuity of the radio resources is also easier to achieve.

The embodiment of the invention provides a fan regulation and control method for an advanced telecommunication computing architecture ATCA plug-in box. The method includes: partitioning a slot of the ATCA plug-in box; acquiring a temperature alarm event reported by an intelligent platform management controller IPMC of each node of each partition according to a preset time interval; and controlling a fan and a single board of each partition according to the acquired temperature alarm event. According to the fan regulation and control method, partitioning management of the slot of the ATCA plug-in box is performed, the fan in each partition is controlled according to the temperature alarm event in each partition, accurate control of the fan can be achieved, and an energy-saving and emission reduction effect can be achieved.

The invention discloses a hybrid network system and a switching method based on the same. The system can comprise a plurality of transmitting devices and a plurality of transceiving devices, wherein each transmitting device can transmit signals to a terminal through a first network, and each transceiving device can transmit signals to the terminal through a second network; and each one of the transceiving devices can acquire communication configuration parameters of adjacent transmitting devices. If the terminal detects that the strength of currently received signals is lower than the switching threshold, the communication configuration parameters can be acquired from at least one transceiving device adjacent to the terminal, and one of the transmitting devices or one of the transceiving devices can be switched to on the basis of the acquired communication configuration parameters. By using the system and the method, the switching frequency of the terminal is reduced, thereby reducingthe ping-pong effect; and in addition, number of times for the terminal to search, contrast and synchronize signals, thereby achieving the purpose of reducing the power consumption of the terminal.

The invention discloses a cluster switching method for vehicle-to-vehicle communication, which introduces parameters such as a report threshold, an increase lag threshold, a replacement lag thresholdand the like for a V2V system, and performs cluster switching by calculating and comparing dynamic index values. The method can ensure the switching accuracy, effectively reduce the ping-pong effect and reduce the signaling overhead. Compared with a traditional method, positioning is not needed, and therefore the method can be applied to shielded scenes such as tunnels. Besides 4G and 5G systems of cellular communication, the design idea of the invention is also suitable for other Internet of Vehicles communication systems, such as a dedicated short-range communication (DSRC) system and the like.