242 results about "Ultra dense network" patented technology

The invention discloses a distributed mobile edge computing unloading method in an ultra-dense network architecture, belonging to the technical field of wireless communication network and cloud computing. The method includes the following steps: calculating the interference of mobile equipment, and if unloading is needed, carrying out computing unloading by selecting a strategy that meets the loadlimitation, interference limitation and delay limitation; further, when the energy overhead of the selected strategy is superior to a current computing unloading strategy, sending update request information to a currently-selected base station to request to update the own computing unloading strategy; after the mobile equipment acquires the information that the base station allows to update the computing strategy, notifying other mobile equipment that the current update opportunity has been acquired, and adopting the updated strategy in the next time slot; and if the mobile equipment does notacquire the update opportunity, maintaining the existing strategy in the next time slot. According to the method disclosed by the invention, the energy consumption in a computing unloading process can be effectively reduced under the premise of guaranteeing a certain delay limitation, the purpose of saving the energy consumption can be effectively achieved, and the good leading effect and applicability can be achieved.

A resource allocation method for reinforcement learning in an ultra-dense network is provided. The invention relates to the field of ultra-dense networks in 5G (fifth generation) mobile communications and provides a method for allocating resources between a home node B and a macro node B, between a home node B and another home node B and between a home node B and a mobile user in a dense deployment network; the method is implemented through power control, each femotcell is considered as an intelligent body to jointly adjust transmitting powers of home node Bs, the densely deployed home node Bs are avoided causing severe jamming to a macro node B and an adjacent B when transmitting at maximum powder, and system throughput is maximized; user delay QoS is considered, and traditional 'Shannon capacity' is replaced with 'available capacity' that may ensure user delay; a supermodular game model is utilized such that whole network power distribution gains Nash equilibrium; the reinforcement learning method Q-learning is utilized such that the home node B has learning function, and optimal power distribution can be achieved; by using the resource allocation method, it is possible to effectively improve the system capacity of an ultra-dense network at the premise of satisfying user delay.

The invention provides a resource allocation method based on non-cooperative gambling in a super dense network. A double-layer network in the super dense network is analyzed to propose a shared and orthogonal hybrid spectrum allocation method based on perception; a multi-dimensional resource allocation model of base station connection, a user channel and power allocation is obtained by describing the base station connection, a channel model and system capacity; the resource allocation method based on the non-cooperative gambling is proposed to solve the multi-dimensional resource allocation problem, the algorithm describes a non-cooperative gambling model, an allowed domain is introduced to solve optimal power allocation, the 0-1 discrete variable of the base station connection is relaxed to a variable of a (0,1) section, an allocation channel is judged by normative punishment, and an algorithm for mutual iteration of the base station connection, the user channel and the power allocation is formed. The cross-layer and co-layer interference and the multi-dimensional radio resource allocation problem between a macro cell and a micro cell are solved, and the resource allocation method has certain superiority of inhibiting the interference and improving the throughput of the entire system.

The invention discloses a method for reducing switch failures in an ultra-dense wireless network and belongs to the mobility optimization technique in wireless communication. The method comprises the following steps: configuring different initial switching parameters for UE at different speeds, and then automatically adjusting the switching parameters according to the switching history; calculating the failure times and the success times of switching within the given time window length, and thus providing a new method for dynamically adjusting switch parameters. In the ultra-dense network, under the condition that Picocells are densely deployed in the area, the method can realize self-adaptative adjustment for the switch parameters, effectively reduces the switch failure rates when the UE passes through the area with the densely-deployed Picocells, and can realize the balance of reducing the switch failure rates and reducing small ping-pong ball rate.

The invention belongs to the technical field of wireless communication, and particularly relates to a method for optimizing VM migration between mobile edge computing (MEC) nodes in an ultra-dense network. The applied ultra-dense network includes gateway nodes, aggregation nodes and edge nodes. The method includes the following steps: when a VM of the MEC nodes needs to be migrated, firstly calculating initialization characteristics, and calculating the energy consumption generated by the interaction with the VM when a user moves in the same gateway node range according to the predicted migration time of the user, wherein the energy consumption includes the energy consumption Wmig generated by transmitting data to a destination node, the energy consumption Wpre generated by transmitting the data to a source node, and the energy consumption Wafter generated by performing connection with the VM to carry out data transmission in three categories of node coverage areas when the location ofthe user changes; secondly, establishing an optimal return model; and finally, solving the optimal return model to select an optimal VM migration strategy. According to the method disclosed by the invention, a flexible migration function of the VM in a special scene can be realized, the energy consumption of the system can be effectively reduced, and the migration efficiency can be improved; andreasonable resource matching can be achieved, and service requirements of the user can be met.

The invention discloses an allocation method for wireless resources of an ultra dense network based on dynamic clustering. The allocation method comprises a base station dynamic clustering process and a resource block allocating process, and is characterized in that in the base station dynamic clustering process, dynamic clustering is performed on base stations randomly distributed in the network, a lot of base stations in the network are clustered according to an improved K-mean clustering method, and an effective allocation space is provided for inter-cluster resource block allocation of different modes of users; and in the resource block allocating process, joint processing is performed on single base station resource allocation of center users and inter-cluster CoMP resource allocation of edge users according to a clustering result in the step one, resource blocks with an excellent channel state of the base stations are allocated preferentially in clusters where the users are located according a provided proportional fairness based resource block allocation method, the received interference is reduced at the same time, the proportional fairness among the different modes of users is ensured, and an optimal resource block allocation result is acquired. The method disclosed by the invention can effectively improve the sum rate of the system users and achieves an ultimate objective of overall network resource optimization.

The invention discloses a method for combining dynamic access and subcarrier allocation under a cache-based ultra-dense network. The method comprises the following specific steps that firstly, multiple users simultaneously send request information to all access points to search a caching content; secondly, each access point judges whether a caching content requested by the current user K exists, all access points meeting the user K transmit respective property parameters to local control, and the local control allocates the optimal access point to the user K, otherwise the user K directly sends a request to a remote server to obtain the content; thirdly, the remote server utilizes popularity analysis to complete cache updating according to the user request information; and lastly, after each user is matched with the respective access point, subcarrier allocation is carried out, so that each user is communicated with the respective access point. The method has the following advantages that multiple factors are synthesized to complete access selection, and promotion of the resource management efficiency and dynamic allocation of the subcarrier are realized, so that the spectral efficiency is remarkably improved.

The invention relates to a seamless handover method based on collaborative base station clustering in an ultra-dense network. The method comprises the steps of firstly, collaboratively clustering small base stations deployed in an ultra-dense manner; implementing overlapped clustering to acquire an overlapped cluster node; when a user moves in a cluster, adopting a dynamically self-updating method for a service base station group to meet the intra-cluster handover requirement of the user; and when the user moves across the clusters, adopting a handover pre-warning mechanism to perform pretreatment early for handover, thus reducing preparation time for handover, then executing a handover process, and finally completing seamless handover. According to the method, the collaborative base station clustering and handover pre-warning serve as entry points, according to the moving conditions of the mobile user such as moving in the cluster, and moving across the clusters, the different handover strategies are used for performing efficient cell handover, the handover delay is reduced, the handover failure rate is lowered, and the seamless handover experience of the user is enhanced.

The invention discloses an edge computing resource allocation method and system for an ultra-dense network, and the method comprises the steps: collecting task requests of all terminal devices and resource states of all edge servers from a global perspective, and carrying out the reasonable allocation of computing resources of all the edge servers through employing an SDN controller as a decisionbody; the system comprises a macro base station, a micro base station and an edge server, and the macro base station is connected with each micro base station through a high-speed optical fiber link,and is in wireless connection with a mobile user. And the macro base station manages the resource condition of the whole network from the overall perspective and collects the information of each mobile user. According to the invention, the effectiveness of edge server computing resources, the resource total quantity of each server and performance difference are fully considered; a bidirectional multi-round auction mechanism is introduced into the multi-server computing resource distribution process in the ultra-dense network, the total income of the servers is maximized on the premise that theuser service quality is guaranteed, and the loads of all the servers are balanced.

The invention discloses a distributed ultra-dense heterogeneous network interference coordination method based on a non-cooperative game. A network interference problem is modeled as a non-cooperative game problem by analyzing a dynamic feature of an ultra-dense network, cells in the network are used as game participants, and autointerference is minimized to be a utility function. In order to deduce existence of a Nash equilibrium solution, building of a game model is deduced into a potential game problem, and a feedback method based on random learning is provided accordingly to solve the Nash equilibrium solution. According to the method, a probability matrix is built according to the utility function of each cell for each time of iteration, and the final Nash equilibrium solution is acquired by continuously updating the probability matrix. According to the method provided by the invention, the closed-form solution can achieved by convergence without information exchange between the cells, so that at last the whole network interference is minimal, when all the cells are converged to the Nash equilibrium solution, network capacity is improved, and the requirement of dynamic variation of user speed is met, and the difficulty among network densification, network capacity and spectrum efficiency is effectively solved with relatively low complexity.

The invention discloses a high energy efficiency power control method which takes energy harvest into consideration in an ultra-dense network. The method comprises following steps of 1, setting a double-layer heterogeneous network scene; 2, distributing subchannels; 3, carrying out initial power distribution on each subchannel of a macro base station and each home base station; 4, judging whether the power distribution of all home base stations is converged or not, or whether the number of iterations exceeds an upper limit or not; 5, solving the optimum transmitting power distribution of the home base stations; 6, stopping iteration of this time; finishing distribution of wireless resources of each home base station; and waiting for scheduling of next time. According to the method, the QoS demands of the users of the home base stations are taken into consideration, and moreover, the energy efficiency of the heterogeneous network is improved greatly by using an energy harvest technique.

The invention discloses a heterogeneous network segmentation method and system for 5G. The method comprises the following steps: adopting a dual connection architecture in an ultra-dense network architecture, wherein the dual connection architecture comprises a macro base station for realizing a control function and densely-deployed wireless access nodes for realizing a data function, the macro base station is in communication connection with the densely-deployed wireless access nodes, and the control function and the data function are separately deployed on two different carriers of the dual connection architecture to achieve the separation between the control function and the data function; and decomposing the whole processing procedure of a physical layer and a medium access control layer of a 5G protocol stack into multiple corresponding sub-function modules, segmenting the whole processing procedure into a node processing procedure and a network processing procedure by taking the sub-function modules as minimum basic processing tasks aiming at the delay and capacity characteristics of forward and return links, and separately performing the processing procedures in dense node domains and network domains. The ultra-dense network with low cost, easy deployment and light maintenance can be achieved.

The invention discloses a frequency domain resource distribution method based on graph coloring in an ultra-dense network. The frequency domain resource distribution method comprises the following steps: reflecting a disturbed condition between small stations by utilizing a disturbance relationship graph; and coloring the disturbance relationship graph by utilizing a multiplexing algorithm based on a conventional graph coloring Brelaz algorithm, and distributing sub-band for each user according to the coloring results, thereby achieving a purpose of reducing the disturbance between the small stations. The method disclosed by the invention can be used for remarkably reducing the disturbance between the small stations, so that the total throughput and edge throughput of the system are increased.

The present invention provides a cache method based on small base station self-organization cooperation in a super-dense network, belonging to the technical field of wireless communication. The methodcomprises the steps of: according to the load capacities and the positions of small base stations in a super-dense network, obtaining a similarity matrix of the small base station; according to the similarity matrix and the quantity k of the small base stations in each cluster, performing clustering, and selecting a small base stations with the best load capacity as a cluster head; according to afile cache strategy, caching the file into the small base station and a macro station; after users access the base stations, requesting to obtain a file; and finally, determining the value of the k exceeds the maximum value k set in the cluster or not, if yes, outputting a k value with the minimum average download delay of the user; or else, continuously updating the k value, and continuously performing re-clustering. Through the self-organization thought, the resources in the cluster are distributed, and the mutual cooperation and self organization between the small base stations are employed to reduce the user download delay while effectively improving the cache hit ratio and meet the business demands.

The invention discloses a collaborative edge caching algorithm for delay optimization in an ultra-dense network. The collaborative edge caching algorithm comprises the following specific steps: 1, setting each parameter of a system model; 2, making an optimal cache decision for each SBS by adopting a multi-agent reinforcement learning algorithm based on the game theory so as to maximize the content cache hit rate of each SBS; 3, making an optimal bandwidth resource allocation decision for each SBS by adopting an improved branch and bound method so as to minimize the total content downloading delay of all user equipment. According to the method, the content downloading delay of all users in the ultra-dense network can be effectively reduced, the content cache hit rate and the spectrum resource utilization rate are improved, and the algorithm has good robustness and expandability and is suitable for the large-scale user-intensive ultra-dense network.

The invention relates to the communication technology field and particularly relates to a small cell switching method and system. The method comprises steps that whether user equipment needs small cell switching is determined by a macro base station; if the UE is determined to need small cell switching, the UE is controlled by the macro base station to connect with a target small cell; after the UE is successfully connected with the target small cell, a resident small cell is indicated by the macro base station to release connection with the UE. Through the method, seamless soft switching of the UE from the resident small cell to the target small cell can be realized, continuity of user surface data transmission in a switching process is guaranteed, and user mobility demands in the super dense network are satisfied, and user experience is improved.

The invention discloses a multi-modal medical image fusion method based on a double-residual ultra-dense network, and the method comprises the steps: extracting the shallow features of a first modal medical image and a second modal medical image through the convolution of a first Conv layer and the activation of a PReLU layer in the double-residual ultra-dense network; extracting deep features through residual learning and ultra-dense connection; and sequentially performing Concat layer channel dimension splicing in the double-residual ultra-dense network on the deep features, and finally performing Conv layer convolution and PReLU layer activation to obtain a fused image of the first modal medical image and the second modal medical image. The double-residual ultra-dense block provided bycombining the residual dense block and the ultra-dense connection not only applies the dense connection between layers of the same path, but also applies the dense connection between layers crossing different paths, and performs information transmission between two paths for extracting different modal image features, so that the extracted deep features are more detailed and richer, and loss of useful information of the network intermediate layer is reduced.

The invention discloses a 5G ultra dense network switching method based on precise point positioning. By means of the precise point positioning technology, the current user location in an ultra densenetwork is measured, the location of the next moment is predicted, decision switching is conducted according to the signal to interference ratio of the current moment and the predicted signal to interference ratio of the next moment, a target micro cell can prepare resources for a possibly-generated access request in advance, the performance of the ultra dense network is improved, the ping-pong effect in the network is reduced, the average delay of the network is shortened, the generality and the validity are considered simultaneously, and the system performance is improved.

The invention discloses an online collaborative caching method based on optimized energy efficiency, which belongs to the technical field of communication and comprises the following steps of firstly,establishing a double-layer heterogeneous ultra-dense network scene comprising a content server CP, a macro base station MBS, a small base station SBS and user UE; aiming at the new content l to becached, enabling an MBS to calculate a preference factor and a social factor of a certain user UE for the content; further obtaining a preference factor and a social factor of each piece of UE on thecontent, calculating a decision function value by combining the current heat factor of the content l, adding the content l into the cache file set when the decision function value l is greater than orequal to a judgment threshold I0, and meanwhile, calculating each SBS capable of caching the content by MBS; judging whether each SBS needing to cache the content l and the MBS have enough cache space or not, and if so, directly caching the content l; otherwise, deleting from the most recently requested file until the cache space is sufficient to store the content l. According to the invention, the real-time distribution of the cache content can be realized, the energy consumption is saved, and the network cost is saved.

The invention discloses a dynamic access method based on energy efficiency and spectral efficiency under an ultra-dense network. The method comprises the following steps of (1) carrying out ACS (Access Control System) division on wireless APs (Access Point) under the ultra-dense network; (2) enabling each divided ACS to be respectively corresponding to one local control unit; (3) when user equipment enters one ACS, enabling the local control unit to activate all Aps belonging to the ACS; (4) grouping the APs in the current ACS according to the data rate requirement of the user equipment; and (5) respectively comparing a rate C of an activated group and a rate requirement R of a user, and judging whether the current group meets user requirements; if yes, not changing grouping of the current ACS and finishing an algorithm, otherwise regrouping the Aps in the current ACS. The method has the advantages that a dynamic resource scheduling function is realized, the energy loss is reduced along with increase of the business rate requirement and the energy efficiency is improved; through dynamic allocation of bandwidth, the spectral efficiency is remarkably improved.

The invention discloses a super dense network clustering method based on a density improvement K-Means algorithm. The method comprises the following steps: firstly calculating distribution density anda clustering density threshold of microcell base stations in a super dense network; selecting the base stations having the distribution density being greater than the clustering density threshold asinitial cluster centers, and forming an initial cluster center pool; screening a final cluster center point by making the distance between any two initial cluster centers in the initial cluster centerpool be greater than a cluster center isolation distance; and using the final cluster center number K and corresponding geographic positions as input parameters of the traditional K-Means, and executing the K-Means algorithm to obtain a clustering result of all base stations in the super dense network. By adoption of the super dense network clustering method, dynamic clustering can be performed according to the change of the network topology, the situation of being caught in a locally optimal solution is avoided by screening the cluster center points, thereby improving the clustering accuracy, meanwhile accelerating the clustering convergence speed, and the super dense network clustering method can be applied to network clustering and base station resource scheduling.

The invention provides a virtual cell resource allocation method, device and system, relates to the field of mobile communication. The method, the device and the system are used for solving the problem of lacking a mechanism for carrying out resource scheduling to the data transmission process in a virtual cell. The method comprises that a master transmission point selects a service transmission point as a target transmission point according to the demands of UE (User Equipment), wherein the master transmission point indicates the UE and the target transmission point to transmit data. The technical solution provided by the invention is applicable to UDN (Ultra-Dense Networks); and the resource negotiation of high user average throughput rate is realized.