57 results about "Network survivability" patented technology

The invention relates to a survivability method based on identification of reliable service in an optical communication multi-domain optical network, which comprises the following steps that: 1) a single-domain route controller forms an interoperation control plane by automatically discovering and searching a peer route controller of the single-domain route controller by neighbors; 2) the route controller realizes topology abstraction belonging to a single domain to obtain and store aggregation routing information; 3) a source node receives service connecting requests; 4) the source node sends a route establishing request to the route controller positioned in the domain; 5) a source route controller operates an end-to-end work /protection routing algorithm based on conditional risk separating degree on a convergent network; 6) the source route controller returns a request response message to the source node and initiates a resource reservation request; 7) the source node adds the returned work/protection route into an RSVP-TE PATH message which performs path request along an appointed route; 8) a wavelength is selected through a wavelength assignment algorithm; and 9) the message is returned along the prior path of the PATH message to complete the resource reservation of the source node. The method has the advantages of high network availability and high resource utilization rate.

An electric power communication network survivability evaluating method comprises the following steps: a, parts of an electric power communication network are abstracted as nodes, and physical links are abstracted as edges; b, network efficiency in an original state is calculated; c, each node and each edge are deleted in order, and network efficiency of a newly generated graph is calculated; d, fault influence degrees of each node and each edge are calculated; e, a whole-network survivability degree is calculated; and f, evaluation is carried out on the survivability of the electric power communication network through utilizing the whole-network survivability degree. According to the electric power communication network survivability evaluating method of the invention, the importance degree of each part in the electric power communication system for network performance is taken into consideration, and at the same time, effects of the links in the network are taken into consideration, so that a whole destroy process of the electric power communication system can be reflected. The method eliminates one-sidedness of existing evaluating methods. According to the method of the invention, the evaluated results are more objective and reasonable. At the beginning of an electric power communication network topological structure design process, the method is utilized to carry out quantitative analysis on the survivability of the network, and accordingly a design scheme of the network can be optimized and the survivability degree of the network is raised.

The invention discloses a WSN (wireless sensing network) survivable routing method and a survivability evaluation model based on clusters. Mechanisms of key negotiation, identity identification, standby cluster head chain, semi-Markov chain, inter-cluster routing and the like are integrated, and the SRPC (survivability routing protocol based on clusters) anti-attack capability is high. The attack of malicious nodes is resisted through key negotiation and identity identification, the availability and the completeness of the monitoring information are ensured, the energy consumption is low, and the service life is long. Energy factors are introduced, in addition, the single-hop routing and the inter-cluster multi-hop routing are combined for transmitting the monitoring data, the anti-attack capability of a network can be obviously improved, and in addition, the network surviving capability reaches the optimum state through the balance. The delivery rate is high, and after the SRPC protocol cluster head nodes fail or are damaged, the data is transmitted to the standby cluster heads with the highest priority. The survivability evaluation model has the universality, is applicable to the quantitative evaluation on the WSN with the network state stay time complying with the negative index distribution, and can also be used for evaluating the WSN with the changeable network surviving state and the irregular state stay time.

The present invention relates to a method for enhancing survivability of automatic switching optical network (ASON). Said method is characterized by that said invention utilizes the downstream node of damaged chain link to coordinate optical network resource distribution of damaged channel, solve the influence of optical network resource collision to network survivability in the course of chain link failure restoration and raise restoration successful rate. Said invention adopts a staged parallel restoration process so as to reduce connection creating time.

The invention belongs to the technical field of network security, and particularly relates to a multi-step attack dynamic defense decision selection method and system for network attack and defense, and the method comprises the steps: generating a network attribute attack graph through the analysis of network security element information; constructing a network survivability game model based on the attack graph, representing an attack and defense strategy and a path by the model by utilizing an attack and defense strategy matrix, and quantifying attack and defense intensity and network survivability; predicting the next attack behavior of an attacker according to the attack strategy matrix in the model, and selecting the optimal multi-step attack defense strategy according to the attack defense strategy cost. The attack and defense strategy is implemented around the network survivability, the situation pre-judgment and defense strategy can be adjusted according to the dynamically changing attack and defense situation of the network, an easily understood and reasonable defense decision is provided for network security management personnel, the network defense capability is improved,the application prospect is good, and the method has important guiding significance and value for the network security technology.

The invention discloses a software-definition survivable network construction method. The method is mainly used to solve problems of poor survivability and long survivability recovery time in the prior art. The method is characterized in that through thinking of software definition network logic, forwarding separation and centralized management and control, firstly, a survivability controller is used to collect network topologies and reasonably program a network route; secondly, when the network is damaged, the survivability controller replans the network route according to a damaged node, a link and an area in real time so as to realize a network survivability ability. In the invention, two kinds of survivability recovery algorithms are provided. The two kinds of survivability recovery algorithms comprise shortest path recovery and fastest speed recovery. The shortest path recovery can guarantee that network end-to-end is a shortest path and the fastest speed recovery can guarantee that recovery time is shortest. Through using the method to establish the survival network, rapid survivability recovery can be realized and compatibility with a traditional network can be guaranteed. An application demand of a high network connectivity requirement under severe environments of natural disasters, military application and the like can be satisfied.

The invention relates to a wireless sensor network survivability evaluation method based on an evolutionary game model. The method comprises the following steps of (1), performing model selection from a wireless sensor network model, an attacking model and an epidemic disease model; (2), establishing a survivability model; and (3) evaluating wireless sensor network survivability through evolution dynamics analysis. According to the method of the invention, an influence which is generated by network survivability is analyzed through connectivity of a network cluster head node; the epidemic disease model based on the attack is established by a node attack bearing problem; then a survivability evaluation model based on evaluation gaming is established; a dynamic process is selected by means of a strategy of copying a dynamic equation researching node; an evolution stabilization strategy which is selected by the node strategy is searched; and when the survivability evaluation model for the attacked network reaches an evaluation stable state, performance indexes such as connectivity and stability are used as network survivability evaluation mechanisms, and furthermore verification is performed.

The embodiment of the invention provides a fault analysis method, a fault analysis device and a server. The fault analysis method provided by the invention may comprise the following steps of: determining a network fault with the highest fault probability in a network; and performing fault analysis on the network fault with the highest fault probability. According to the embodiment of the invention, efficiency of analysis on network survivability may be improved.

The invention discloses a business level classification based frequency spectrum sharing degree protecting method and device. The business level classification based frequency spectrum sharing degree protecting device mainly comprises a path business request level classification module (2), an establishment module (4), a frequency spectrum sharing degree setting module (6), a first frequency spectrum resource distribution module (8), a second frequency spectrum resource distribution module (10) and a sequence classification module. The general conception of the business level classification based frequency spectrum sharing degree protecting method and device aims at the survivability problem of an optical network with flexible frequency spectrums and the problem of how to carry out effective protection and rapid recovery when a business is in failure. Different business service levels are classified and protected by introducing the basic idea of the frequency spectrum sharing degree, and distribution and optimization of the frequency spectrum resource for the businesses are carried out through self-adaptively adjusting the threshold of the frequency spectrum sharing degree, so that vicious competition in a malfunctioned business recovery process caused by frequency spectrum resource sharing is removed, a restrictive relation between the business failure recovery and the frequency spectrum efficiency is removed, and the network survivability of the businesses is ensured.

The invention relates to a method, a device and a system for protecting the operator backbone network transmission service; wherein the method comprises the following steps of: searching a protection group which corresponds to the service and has at least one operator backbone network bridge transmission engineering tunnel and an operator backbone network bridge virtual local area network; detecting whether the malfunction occurs to the operator backbone network bridge transmission engineering tunnel in the protection group or not; if so, the operator backbone network bridge virtual local area network in the protection group is started and used as a backup transmission passage of the operator backbone network bridge transmission engineering tunnel; and sending the service. The method, the device and the system realize the transmission of data frames by sending and receiving on the basis of the protection group, and overcomes the defect that the network survivability in the prior art is low.

The invention discloses a multi-state space information network topology generation optimization algorithm. The multi-state characteristic of the satellite system is considered; existing satellite constellations, the connectivity, the visual distance and the like are used as constraint conditions; high dynamics of a satellite network is realized; an improved multi-objective simulated annealing algorithm is designed to perform topology generation by taking link average end-to-end time delay and maximum end-to-end time delay as optimization objectives, an approximate solution of a global optimaltopology structure is obtained under the condition of considering multiple states of a satellite, and the reliability and invulnerability of the generated satellite network topology are proved. By designing an algorithm, the static topology is changed, generated and optimized into the dynamic topology, the network time delay is reduced, and the network survivability is improved. By means of the ISOSA algorithm, the problem that the network communication performance of static topology is reduced under the multi-state condition is solved, and rapid transmission of information between satellitesand survivability of the whole space information network are guaranteed.

The invention discloses a microgrid reliability evaluation method based on network survivability. According to the method, considering a microgrid safety criterion condition and an operation constraint, a reliability global index of the microgrid is evaluated according to the network survivability obtained via a microgrid network structure; and the capacity of maintaining connectivity of the wholenetwork of the actual microgrid is taken into consideration. In the field of electric power systems, the survivability can be understood to be when a distribution network breaks down or is overhauledby equipment, the communication performance of the network can be kept to the largest extent, so that the capacity of load loss in the fault process is reduced. The fully-communicated network is a network with the most compact structure and also is a network with the strongest survivability. According to the method, the survivability of the network is evaluated, and through the structural difference between the actual network and full-communication network of the corresponding number of nodes, evaluation is carried out by utilizing a network survivability index based on the equivalent shortest path number.

The invention discloses a method for improving survivability of a wireless sensor network. The method mainly includes the first step of dividing the whole WSN network into k subnets through a clustering algorithm and iteration combined method, the second step of calculating sink nodes in each subnet through an equilibrium point calculation method for the k subnets obtained through division in the first step, and the third step of putting forward to a multi-hopping multi-center network survivability detecting and evaluating method to evaluate the overall survivability of the network through combination with the results obtained in the second step. The method is suitable for the complex wireless sensor network which has the multi-hopping multi-center characteristic and is provided with the nodes obviously different from one another in the aspects of service types, data volumes and the like, and the survivability of the network of this type can be effectively improved.

The invention relates to a method for wireless function deployment of a low-cost HOWBAN (Hybrid Optical-Wireless Broadband Access Network) with survivable perception, belonging to the technical field of optical wireless hybrid network communication. The method aims at the problems that the existing survivable protection mechanism cannot carry out reasonable wireless function deployment on ONUs (Optical Network Unit) thereof according to the survivability guarantee level of a network, and data affected by a fault is only forwarded between some ONUs, and the wireless function deployment is carried out on all ONUs in the network to cause reduction of the network resource utilization rate and higher deployment cost, and furthermore, a quantitative analysis method is adopted to evaluate the network survivability, so that the network reliability is obtained by accurately quantizing the current wireless function deployment condition of the ONUs, and thus a multi-target optimization method is utilized to effectively balance the network cost and the network reliability, and the wireless function deployment of the ONUs is completed with the maximum resource utilization rate as a target. According to the method, the network survivability can be met while the purposes of improving the network resource utilization rate and reducing the network cost are achieved.

The invention discloses an optical network multi-fault tolerant method which relates to the technical field of optical network survivability. Each optical network node i maintains an information prime matrix Ti and a local node model Mi. The method comprises the following steps of: S1. a positive ant in each node of an optical network selects a target node d according to flow distribution at a preset time interval, asynchronously moves to the target node d and records the physical connectivity of the passed path and a path node identifier; S2. after the positive ant arrives at the target node, a reverse ant is generated at the target node, and the positive ant transfers all memories to the reverse ant; and S3. the reverse ant returns along the passed path of the positive ant and adjusts the local node model in a network state and the information prime matrix of each accessed node on the way according to the final connectivity of the path. Through the invention, the damaged business can be rapidly turned to a normal network resource and the arrival business can be selected to a path with higher connectivity.

The invention discloses a backbone network frame search method considering element comprehensive importance and network survivability. The method comprises the steps of introducing an economic factor based on conventional electric betweenness, and establishing an index for evaluating branch importance; according to node neighbor information and a clustering coefficient, establishing an index for evaluating node importance; based on the branch and node importance indexes, and by introducing a whole network survivability index, building a backbone network frame mathematic model considering element importance and network survivability; and based on a guide fireworks algorithm, implementing the model. According to the method, a line importance index, the node importance index and the network survivability index are combined; the backbone network frame mathematic model considering the element comprehensive importance and the network survivability is built; the model can assess the importance of lines and nodes in a power system more comprehensively, so that a most reasonable backbone network frame is obtained and the capability of a power grid in resisting a power failure accident is improved; and the method is suitable for construction of the backbone network frame of the power grid and reconstruction calculation of the power grid.

The invention relates to the technical field of a computer network and particularly discloses an all optical network business restoration method based on bandwidth compression, which comprises the following steps of: S1, reducing a bandwidth required for restoring a failure business from two aspects: 1) first compressing a protection bandwidth between channels through a specific restoration route strategy to obtain a restoration route; 2) utilizing the controllable modulation order characteristics of an all optical network to compress the bandwidth required by the failure business self if network resources for the normal restoration of the failure business are insufficient on the restoration route; S2, allocating required frequency spectrum resources for the failure business in the restoration route so as to restore the transmission of the failure business. The invention has the advantages that with the restoration route strategy, the protection bandwidth between the channels can be compressed, the utilization rate of the resources and the protection restoration success rate are improved, and the network survivability is enhanced; with the mode for improving the modulation order, the bandwidth required by the business self can be compressed as far as possible under the condition of ensuring certain signal quality, and the business restoration success rate can be effectively increased.

The present invention discloses a distributed multi-hop networking method applicable to double heading marshalling of a heavy load locomotive. The method comprises: a current locomotive scans a channel; the current locomotive establish a network by itself if the current locomotive does not receive the NCFG information from other locomotives in a first preset time period; the current locomotive takes other locomotives as sponsor locomotives and joins the network where the sponsor locomotives are located if the current locomotive receives the NCFG information from other locomotives in the first preset time period and receives the NCFG information from the same locomotive twice in a second preset time period. According to the invention, each locomotive is taken as one network node and completes network entry, networking, network maintenance, resource scheduling and the like by themselves, therefore the reliability and the availability of the double heading marshalling of a heavy load locomotive are effectively enhanced, the robust networking is realized in the condition the locomotive breaks down or a link breaks down, and the network survivability is effectively improved.

The invention discloses an infrastructure network survivability evaluation method and model based on regional damage. The evaluation model comprises an edge conversion module, a weighted clustering algorithm module, a coverage node key area search algorithm module, a single key area search algorithm module, a multi-key area search algorithm module and a network survivability evaluation module. Andthe plurality of modules are electrically connected in sequence, an obtained infrastructure network structure is a topological structure; the edges are converted into virtual nodes with the same weight; a set of virtual points are obtained, nodes damaged by the damaged circle and the virtual nodes are calculated; critical regions are obtained, a key area covering a certain real node, a single keyarea of the infrastructure network and all key areas are sequentially calculated to obtain the edge storage ratio value set, normalization is carried out according to the loss ratio accumulation value acquired according to the storage ratio value set, the evaluation result is acquired, influence factors are considered from multiple aspects, and the evaluation model application scope is enlarged.

The invention relates to an optical network intelligent control method, device and system; the method comprises the steps: analyzing the network survivability through a controller based on whole network topology information and service connection information, and obtaining and issuing survival data to an ASON level control node for storage; when a network link fault occurs, establishing, by a source node of a fault service in the ASON level control node, a rerouting connection for a fault link according to the survival data, and reporting a rerouting connection establishment result to the controller; then updating, by the controller, a fault service recovery state according to the rerouting connection establishment result, and performing re-optimization calculation on a fault link which fails in recovery so as to obtain a new rerouting connection path; and sending the new rerouting connection path to the source node of the fault service so as to carry out service recovery on the fault link which fails in recovery. According to the invention, the centralized control of the controller is combined with the distributed control technology of the ASON control level nodes, so that the survivability of the optical network is effectively improved.