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108results about How to "Increase access rate" patented technology

Self-adaption adjustment method of contention windows in 802.11e wireless network

The invention discloses a self-adaption adjustment method of contention windows in an 802.11e wireless network. A network load state is determined according to a network conflict rate via a wireless access point, and the contention windows are adjusted in a self-adaption mode according to the network load state. If the conflict rate is detected to be greater than a given threshold value, the access probability between an AP of current network load and an site is calculated in a multiplicative decrease mode according to an actual conflict rate value; if the conflict rate is detected to be smaller than or equal to the given threshold value, the access probability adapted for the current network load is calculated in a linear increase mode according to the actual conflict rate value. On this basis, an AP access probability is optimized according to the length of an AP current queue. Finally, the largest contention windows and the smallest contention windows between the AP and the site are respectively calculated according to the relations between the access probability and the contention windows. According to the method, the values of the contention windows can be adjusted in a self-adaption mode on the basis of network load conditions, so that the effective availability of a wireless channel is improved, network throughput is increased, and network delay is reduced.
Owner:CENT SOUTH UNIV

Modbus protocol conversion system based on 3G (The 3rd Generation Telecommunication) Internet access

The invention relates to a Modbus protocol conversion device based on 3G (The 3rd Generation Telecommunication) Internet access, belonging to a protocol conversion device in the technical field of Internet. Aiming at the instable problem of 3G dial-up access, in order to ensure the correctness and transparency of data transmission during Modbus protocol conversion, the invention adopts the Modbus protocol conversion device based on 3G Internet access. A remote server, a protocol conversion device and data acquisition equipment are needed for hardware architectures. A 3G script completes dial-up access, and a PPP (Point to Point Protocol) automatically detects the network. When the Internet is turned off or a Ping (Packet Internet Groper) is illogical, automatic redial is conducted. Data communication between the protocol conversion device and the server adopts a Modbus TCP (Terminal Control Protocol), and data communication between the protocol conversion device and the data acquisition equipment adopts a Modbus RTU (Remote Terminal Unit) protocol. Transparent data transmission is realized, the protocol conversion device can quickly detect abnormal disconnection of the Internet and automatically connect the Internet to ensure stable and lasting operation, and the protocol conversion device can be used in more environments.
Owner:ZHEJIANG UNIV OF TECH +1

Resource allocation method for D2D (Device-to-Device) communication in cellular network and system

The invention belongs to the field of wireless communication networks, and discloses a resource allocation method for D2D (Device-to-Device) communication in a cellular network and a system. The resource allocation method comprises the following steps: deciding whether to perform clustering or not according to the quantity of cellular users and the quantity of D2D users, and applying a distance-based clustering way if clustering is needed; sequentially selecting the D2D users to serve as master D2D users for executing a resource allocation way based on minimum interference together with the cellular users; and lastly, updating clusters, removing the D2D users who do not satisfy an interference condition from the clusters, performing communication with orthogonal resources, and calculatinga matching way with maximum throughput. The cellular users with minimum interference are always selected for the D2D users in each iteration, and a matching combination with maximum throughput is selected, thereby not only reducing the system interference, but also increasing the user throughput and the access number. A plurality of pairs of D2D users multiplex one cellular user, so that the spectrum utilization ratio is increased greatly.
Owner:JILIN UNIV

Network selection method based on weighted optimal bipartite graph matching

The invention provides a network selection method based on weighted optimal bipartite graph matching. The network selection method based on weighted optimal bipartite graph matching comprises the following steps that (1) the parameters of user present service quality, service demands and network performance all serve as input parameters and applied to the network selection process in a cloud processing center; (2) if the number of users is larger than the number of candidate networks, multi-user fair scheduling is conducted firstly; (3) a bipartite graph model is created for the network selection question; (4) the matching degree of the demands and the network performance of each pair of users is calculated, and network selection based on bipartite graph optimal matching is achieved; (5) the network load conditions are detected, and other networks are reselected for the users in an overload network and the users with access being blocked. According to the network selection method based on weighted optimal bipartite graph matching, a heterogeneous network convergence scene is combined with the multi-user scheduling technology, a complicated problem is divided into simple partial problems to be solved, and low-complexity optical network selection integrating the user demand and the network performance is achieved.
Owner:SOUTHEAST UNIV

Access overload control method of RAN (Radio Access Network) layer in clustered M2M (Machine to Machine) network

The invention discloses an access overload control method of an RAN layer in a clustered M2M network. The method comprises the following steps: (1) dividing MTC equipment in a base station into time delay sensitive equipment and time delay insensitive equipment according to a preset time delay sensitivity limit; (2) acquiring the quantity of users requesting to access in a current time slot by the base station, obtaining a corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum, and then acquiring the quantity of pilot-frequency resources allocated to the time delay sensitive equipment and the quantity of pilot-frequency resources allocated to the time delay insensitive equipment according to the corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum; (3) realizing user access by adopting an ACB mechanism according to the quantity of the allocated pilot-frequency resources by the time delay sensitive equipment, and realizing user access by adopting the ACB mechanism according to the allocated pilot-frequency resources by the time delay insensitive equipment. The method disclosed by the invention can be used for effectively increasing the access rate of the MTC equipment.
Owner:XI AN JIAOTONG UNIV

Message sending method and device, gateway and storage medium

An embodiment of the invention discloses a message sending method and device, a gateway and a storage medium, and belongs to the technical field of computers. The message sending method is applied tothe gateway. The gateway comprises a main program and a plurality of protocol conversion programs. The message sending method comprises the following steps of: receiving a first message issued by a cloud server through the main program, and determining a target protocol conversion program corresponding to a first target equipment identifier from the plurality of protocol conversion programs; issuing the first message to the target protocol conversion program; determining a target interface protocol corresponding to the first target equipment identifier through using the target protocol conversion program; converting the first message according to the target interface protocol to obtain a second message satisfying the target interface protocol; and issuing the second message to first targetequipment. Through adopting the API in the gateway, the interaction between the cloud server and the equipment is realized by adopting a protocol conversion mode, and an interface protocol of the cloud server does not need to be matched with an interface protocol of the equipment, so that the access rate of the cloud server is improved.
Owner:SHENZHEN TENCENT COMP SYST CO LTD +1

Method of implementing updating of web cache through broadcast network

The invention discloses a method of implementing updating of a web cache through a broadcast network. The method comprises the following steps that a user handheld device visits user side gateway equipment with data cache capacity through a network link, when cache data is searched, a user request is immediately answered; when the cache data is not searched, network service is completed through requesting an operator network; the operator network is provided with a unified content gateway server, through a user access content, a data cache is stored in a data cache server as a file, after multiple users request for many times, hot content data is determined through algorithms, such as statistical analysis, of a strategy management server, and the hot content data is transmitted to the user side access gateway equipment through the broadcast network, so that updating of the network data cache is implemented. In comparison with the prior art, the network cache data of the user side access gateway equipment is updated according to a principle that hot spot data is transmitted at one point and is received at multiple points through the broadcast network according to the strategy algorithms, such as the request times and the probability, so that the request for the operator network by a user is reduced, and the method of improving the network access rate and the network response speed is achieved.
Owner:HANGZHOU MICORUNIT TECH

Virtual cell selection method taking user as center

The invention provides a virtual cell selection method taking a user as a center. The method comprises the steps that access points carry out statistics on current load parameters and the number of to-be-accessed users and calculate load prediction values of the access points; the access points transmit the load prediction values; a user obtains channel state information and the load prediction values of adjacent access points, selects an access point combination as a cooperative access point combination according to a preset target function of the user and determines a priority sequence of each access point in the cooperative access point combination; the user initiates random access to the access points which are selected and are not accessed based on the priority sequence of each access point in the cooperative access point combination; and the successfully accessed access points form virtual cells taking the user as the center, thereby transmitting data for the user. According to the method, the user automatically selects the cooperative access points according to the channel state information and load prediction values of the access points, and the purposes of improving the data rate and access probability of the user are realized by reducing the probability that the user selects the high load access points.
Owner:SHANGHAI RES CENT FOR WIRELESS COMM +1
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