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47results about How to "Improve network throughput" patented technology

Internet of vehicles communication joint centralized resource scheduling and self-organizing resource allocation method

The invention provides an internet of vehicles communication joint centralized resource scheduling and self-organizing resource allocation method, relates to an internet of vehicles communication method, and aims at solving the problems in the prior art that the requirements of strict time delay and information transmission reliability of internet of vehicles communication cannot be met; the utilization rate of the network resources is low; the frequency spectrum utilization rate of the network is low; the communication quality of the cellular link cannot be ensured when the V-UEs reuse the cellular user communication link; and only maximizing the network throughput is considered and the user information priority is neglected. The process is that an LTE-V communication network framework based on the D2D communication technology is established; the network system parameters are initialized; the channel gain is computed; the minimum signal to interference plus noise ratio SINR value of the internet of vehicles users V-UEs is set; infV and infC are established; a mathematical model is obtained; x(1) and x(2) are acquired; and x(3) is acquired. The method is used for the field of internet of vehicles communication based on the D2D technology.
Owner:HARBIN INST OF TECH

Method for designing wireless network routing protocol with energy efficiency and coding perception

The invention discloses a method for designing a wireless network routing protocol with energy efficiency and coding perception, which mainly aims to solve the problems that the prior art can not detect more reasonable coding opportunities and prolong the lifetime of networks. The method comprises three steps of routing metric design, route discovery and route maintenance, wherein, in the processof routing metric design, the energy efficiency and the coding perception are combined so as to define a new routing metric EECAR; in the process of route discovery, the minimum surplus energy value of a node in a path is used as the energy level of the whole path, and the nodes with small surplus energy value are avoided in the process of path selection so as to prolong the lifetime of the network, meanwhile, the coding opportunities within the scope of two-hop of the node are detected actively, and the path with more coding opportunities are selected as a transmission path so as to improve the throughput; and in the process of route maintenance, a hello packet includes the neighbor information within the scope of two-hop of the node, and the neighbor information is used for judging the coding opportunities with the scope of two-hop of the node. The invention can be used for energy-limited wireless networks so as to select the optimum transmission path for communication between nodes.
Owner:XIDIAN UNIV

Distributed contention window access method applicable to underwater acoustic network

The present invention provides a distributed contention window access method applicable to an underwater acoustic network, including the steps of: S1, a node of a data packet to be sent exists in a channel; S2, the node of the data packet to be sent detects whether the channel is idle, and sends the data packet if the channel is idle; and goes to a backoff stage if the channel is busy; S3, after the node goes to the backoff stage, a contention window value of each sending node in an underwater acoustic network is initialized, and a propagation delay between each sending node and a receiving node is calculated; S4, according to the propagation delay obtained by calculation, a contention window length of each sending node is calculated; S5, a backoff time period is calculated using a backoff counter by taking the contention window length as a backoff time period of the node, and when the value of the backoff counter decreases to 0, the data packet is sent by the node; and S6, after the data packet is completely sent, the channel returns to an idle state. The method has the advantages of higher network throughput, lower end-to-end delay, lower average power consumption and higher success rate of single sending.
Owner:SOUTH CHINA UNIV OF TECH

Point-to-multipoint in-band full duplex wireless communication media access control method

A point-to-multipoint in-band full duplex wireless communication media access control method belongs to the wireless communication media access control method field, comprising: building connection between a wireless access point (AP) in a communication node and a station by two request frames RTS (Request-to-Send) and RRTS and one response frame CTS (Clear-to-Send), wherein the RRTS frame comprises data package 1 and data package 2 source addresses, a destination address and a data frame length; sending and receiving data packages at the same frequency at the same time by the AP and the station through the built communication link, wherein the transmission type comprises: 1) synchronous two-way link communication taking the station as the source node; 2) synchronous two-way link communication taking the AP as the source node; 3) asynchronous two-way link communication taking the station as the source node; 4) asynchronous two-way link communication taking the AP as the forwarding node. The method provided in the invention is advantaged by that the communication link is built by using amedia access control method once, two different nodes send respective data packages at the same time, the network throughput is remarkably improved, the network delay is reduced, and the method is compatible with the half-duplex wireless communication mode based on RTS/CTS mechanism.
Owner:CHINA UNIV OF MINING & TECH

AODV dynamic delay routing method based on energy aware

The invention discloses an AODV dynamic delay routing method based on energy aware. When path selection is carried out through AODV, two factors: path hop count and node residual energy are firstly taken into consideration and an energy evaluation function is defined, thereby judging paths and selecting the optimum path; an intermediate node dynamically adjust time delay of forwarding an RREQ packet according to the node residual energy, so the routing participation degree of nodes with relatively high node residual energy is improved; and a destination node delays the recording of the RREQ packet, moreover, the optimum master route and two alternative routes are selected according to the energy evaluation function through adoption of a multipath routing policy. An experimental result shows that according to the method, the network node death number is reduced to certain degree, the network integrated energy consumption is reduced, and the network lifetime is prolonged. Relative to a traditional AODV protocol, the method has the advantages that a network packet delivery rate and throughput are obviously improved. Through adoption of the multipath routing policy, the times of restarting a route discovery process can be reduced, and the additional routing overhead can be effectively reduced.
Owner:NANJING UNIV OF POSTS & TELECOMM

A method for adaptively selecting time-frequency blocks of a multi-channel ad hoc network

The invention discloses a method for adaptively selecting time-frequency blocks of a multi-channel self-organizing network, which aims at providing a method for adaptively selecting time-frequency blocks of a multi-channel self-organizing network with good self-adaptability by considering the transmission requirements of a unicast queue and a broadcast queue. The method is suitable for the multi-channel self-organizing network. The invention is realized by the following technical scheme: The multi-channel Ad Hoc network adopts the access mode of time-frequency two-dimensional resources, divides time into several time slots in time domain, divides frequency points into several mutually orthogonal channels in frequency domain, regards each grid as a time-frequency block, and takes time-frequency block as the minimum allocation resource unit in the multi-channel Ad Hoc network; The time-frequency block selection unit automatically selects the most suitable time-frequency block. Accordingto the available time-frequency block information transmitted by the available time-frequency block sensing unit, the transmission capacity requirement is calculated and one or more time-frequency blocks are selected from the available time-frequency block set for transmission to the channel access control unit, and the time and frequency information contained in the selected time-frequency blockis transmitted to the radio transmission unit.
Owner:10TH RES INST OF CETC
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