74 results about "Stochastic geometry" patented technology

The invention discloses a beam optimization method based on a user discovery stage in a millimeter wave system, comprising: modeling a millimeter wave communication system by adopting a random geometric method, and determining a path loss of the millimeter wave communication system and a beamforming gain model to obtain a receiving signal of the millimeter wave communication system; establishing coverage and capacity expressions of the millimeter wave communication system, comparing and analyzing the coverage performance of the system without considering interference and noise; determining therelationship between the capacity of the millimeter wave communication system and the search delay with the beam width as the intermediate quantity, optimizing the beam width to obtain the optimal system performance; using the beamforming technique in the user discovery phase of the millimeter wave to obtain the optimal beam width, and scanning the entire beam space for user search. By optimizingthe scanning beam width of the user discovery phase of the millimeter wave system, the invention solves the problem of the balance between the search delay and the system capacity, and obtains the optimal system performance, thereby saving the cost.

This invention relates to a method of estimating fluxes for the processes of matter and field transport through fluid-saturated or gas-saturated porous solid. The method comprises obtaining three-dimensional porous solid images by, but not limited, X-ray microtomography, 3D NMR imaging, 3D reconstruction from petrographic thin-section analysis etc., digital processing and morphological analysis of the 3D core images by consecutive application of the image filtering, segmentation and multiple property recognition for obtaining digital 3D models of porous solid samples and performing a set of morphological and geometrical statistical property analysis. For the above mentioned 3D model (models) heat, mass, chemical and electric fluxes are modeled (separately or in combination) under given boundary conditions by means of numerical solver. The new models, which are statistically equivalent to the abovementioned model (models) are generated by means of random field and stochastic geometry theory; heat, mass, chemical and electric fluxes are simulated for new models. The obtained fluxes are averaged over realizations to be used in macroscopic calculations.

The present invention discloses a power control method for the heterogeneous network (HetNet) uplink. The method includes: firstly, a distance between user equipment (UE) and a corresponding access point (AP) is determined, i.e., the UE sends an uplink pilot signal to the corresponding AP, and the AP receives the uplink pilot signal and determines the distance between the UE and the corresponding AP according to the path loss of the pilot signal; and users at different distances from the AP are provided with different uplink powers in a same small cell, wherein the uplink power decreases with the increment of the distance according to a power function, i.e., the closer the user is to the AP, the greater the transmission uplink power is. The positions of the AP and UE in the present invention are separately modeled as two independent homogeneous Poisson's point distribution (PPP distribution), and the performance of the system is studied via random geometry. The analysis of the simulation result proves that, compared with the conventional power control strategy, the method of the present invention optimizes the energy efficiency to a certain degree while increasing the average transmission rate, thereby effectively improving the performance of the entire system.

The invention relates to a random geometric data anomaly location method based on Markov random field theory. The random geometric data anomaly location method based on the Markov random field theorycomprises the following steps: establishing a power data network model based on the Markov random field theory, and constructing a corresponding node relationship topological graph; analyzing the topological difference degree of each node before and after the occurrence of the anomaly in the node relationship topological graph, and selecting anomaly nodes to be judged; and performing anomaly judgment on each suspected node to detect the anomaly node according to the correlation degree of a covariance matrix. By means of the random geometric data anomaly location method based on the Markov random field theory provided by the invention, the node location where the anomaly occurs in the power data network can be quickly located, and abnormal behaviors in the network can be eliminated in time;in addition, the random geometric data anomaly location method can effectively reduce the amount of computation required by the network anomaly location and reduce the additional load of the networkwhile ensuring the accuracy of location.

The invention discloses a traffic load sharing method for a delay-tolerant heterogeneous wireless mobile network, comprising the following steps: step 1, constructing an access point AP deployment diagram of a random geometry model in a specific area; step 2, determining the state transition probability of discrete time for a user in the specific area according to the AP deployment diagram constructed in step 1; step 3, determining a probability distribution function of the distance between the user and an AP communicating with the user; step 4, determining the coverage rate of the AP; and step 5, determining a data traffic function of shared load expected by the user in a certain period of time according to the results obtained in step 2, step 3 and step 4. By adopting the method of the invention, the prediction accuracy of load-shared traffic can be improved, and the traffic load sharing efficiency of WIFI can be improved.

The invention discloses an interference suppression method for an underlay inter-device communication cellular network, and belongs to the technical field of wireless communication. The method comprises the following steps: collecting information and establishing a model; and secondly, setting a rejection area, and adopting a hybrid spectrum allocation mode to reduce interference generated by activated D2D communication and received by cellular users outside the rejection area so as to realize interference suppression; thirdly, based on the established model and the interference suppression method, evaluating the key performance indexes of the cellular users and the D2D users by three analysis methods proposed based on a random geometry theory under the setting of a rejection region of a given base station, so as to find an optimal rejection region; finally, making a decision and publishing same. Decisions made by adopting the method can be effective in a long time range, a large amount of complex calculation and resource consumption caused by frequent decisions are avoided, the method has the advantages of being simple, rapid and universal, signaling overhead and system complexitycan be remarkably reduced, and user burden can be reduced.

The invention discloses an inter-cell interference coordination method of a millimeter wave cellular network, and belongs to the technical field of wireless communication. Firstly, information is collected and a model is established. Secondly, two interference coordination methods are provided, an interference coordination parameter rho is set to be greater than or equal to 1, and information transmission of a neighbor millimeter wave base station identified as a strong interference source on a specified time-frequency resource block is muted; thirdly, interference coordination parameters areselected. The method is based on the information collected in the step 1, the established model and the two interference coordination methods provided in the step 2. The key performance indexes of thecellular users are evaluated based on a random geometry theory, the target performance indexes meet the service quality requirements of the users by adjusting the interference coordination parameters, and the interference coordination parameters suitable for the current target network are determined as preconditions for executing the step 4. And finally, an interference coordination scheme is implemented. The inter-cell interference of the millimeter wave frequency band can be effectively suppressed, the communication service quality of millimeter wave cellular users is ensured, the user burden is reduced, and the load of a backbone network is remarkably reduced.

The invention discloses a network flow prediction method and device, and electronic equipment. The network flow prediction method comprises the following steps: modeling a downlink of a cellular network based on a Poisson point process PPP to obtain a network model; establishing a corresponding relationship between a part of orthogonal channels in the plurality of orthogonal channels and the D2D users, and a corresponding relationship between the remaining orthogonal channels and the cellular users; and acquiring signal transmission parameter values at the cellular user and the D2D user, and if the signal transmission parameter values meet a preset condition, calculating the total network flow corresponding to the target time period in the network model according to the flow at the cellular user and the D2D user to obtain a network flow prediction result. According to the embodiment of the invention, the heterogeneous cellular network flow is analyzed and predicted based on the theoretical framework of random geometry, the prediction precision of the network flow is improved, and the maximization of the network flow is realized through spectrum resource allocation.