249 results about "Multipath transmission" patented technology

Closed loop wireless communication of signals using an adaptive transmit antenna array, in which multiple copies of signals to be transmitted by the transmit antenna array are produced with delays and weights that are functions of the multi-path transmission channel characteristics from the transmit antenna array to a receive antenna array of a receiver and are combined before transmission by the transmit antenna array. The delays and weights of the transmit copies for each transmit antenna element are functions of the respective multi-path transmission channel characteristics from that transmit antenna element to the receive antenna array such that the multi-path signal components propagated to each receiver element are received with distinguishable delays according to the propagation path. The receiver combines the received signal components from each receive antenna element with delays and weights that are respective functions of the multi-path transmission channels.

A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid inter-symbol interference. Receiving units in the mobile subscriber units and existing works include antenna arrays to provide a multipath transmission.

A wireless multi-path transmission method and system, data transmitting device, and data receiving device, the method comprising: a data transmitting terminal encodes a plurality of original data packets, the number of encoded data packets being greater than the number of original data packets; the data transmitting terminal transmits the encoded data packets to a data receiving terminal over different transmission links; and the data receiving terminal receives the data packets from different transmission links, decodes and obtains the original data packets. The technical solution encodes and distributes original data packets, thus flexibly realizing multi-path transmission of data. In addition, the technical solution further considers the configuration information of encoding when distributing the encoded data packets, thus effectively utilizing resources provided by each link for user data transmission, improving throughput, and reducing transmission delay.

The invention provides a time delay and bandwidth resource-based relay selection method aiming at broadcast and telecommunication services. The method comprises the following steps of: obtaining a system interruption selection decision value by acquiring time delay information and bandwidth resource information of a node, and selecting a relay node by using the decision value as a judgment threshold. Meanwhile, the invention provides an optimal relay selection cooperative communication method for minimizing interruption probability, and provides a relay routing selection method for supportingmulti-path transmission. The relay routing selection method can dynamically select proper routing according to the change of a network. The method can expand the coverage range of cells and eliminateor reduce communication blind points so as to increase the throughput of a system, improve the spectrum frequency of the system and enhance the quality of services.

A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid intersymbol interference. Receiving units in the mobile subscriber units and existing networks include antenna arrays to provide a multipath transmission.

The invention relates to the field of intelligent transportation, in particular to a vehicle collision preventing method based on collaborative relative positioning technologies. The positioning information measurement and exchange on the basis of a V2V network, an enhanced relative positioning method on the basis of pseudorange, a vehicle self-prediction positioning and navigation method based on Kalman filtering, and a vehicle collision preventing judgment mechanism based on the relative distance are included in the method. The vehicle collision preventing method based on the collaborative relative positioning technologies includes the steps that information between near vehicles is transmitted through the V2V network, the relative distance between the vehicles is calculated on the basis of the pseudorange or Kalman filtering, and a vehicle alarm mechanism is triggered when the relative distance is smaller than a safety threshold value. The vehicle collision preventing method based on the collaborative relative positioning technologies has the advantages that a collaborative relative positioning model is built according to the multipath transmission phenomenon of urban roads, satellite signals with low spatial correlation are removed according to the correlation, and the vehicle position is predicted according to a Kalman filtering method when a GPS signal interrupts. By means of the collaborative relative positioning method, the probability of occurrence of traffic accidents of urban roads can be reduced, and prediction accuracy is improved.

A method of wireless communication includes communicating with a server through a first MPTP path using a first IP address; communicating with the server through a second MPTP path using a second IP address, the communication with the server through the second MPTP path being through a wireless node at the second IP address; and communicating with the wireless node through peer-to-peer communication.

The invention discloses a multipath transmission protocol congestion control method based on reinforcement learning. A Markov decision process is established to express the congestion control in a form. The current network states of sub-streams are expressed by the sizes of congestion windows of the sub-streams and the RTTs of the sub-streams of a sending end, the action of the sending end to adjust the congestion windows and the sending intervals is defined, and a target equation is established to obtain maximum average throughput and a minimum average throughput. A network model is established to simulate and generate a lot of network environments. In different network environments, all actions are executed on the current network environment by continuous trials and errors, and learning and optimization are realized from the feedback provided by the environment. By means of a lot of offline learning, the sending end can make the corresponding action of adjusting the sizes of the congestion windows and the sending intervals in a certain state area, so that the value of the target equation is the maximum.

This disclosure relates to techniques for providing a multipath transmission control protocol proxy in a cellular network. A wireless device may establish a wireless link with a cellular network. The wireless device may provide an indication that the wireless device is multipath transmission control protocol (MPTCP) capable to a core network entity of the cellular network. The wireless device may receive MPTCP proxy information for a MPTCP proxy comprised in the cellular network from the core network entity. The MPTCP proxy information may include MPTCP server IP address and port information. The wireless device may establish a first MPTCP flow with the MPTCP proxy comprised in the cellular network via the wireless link.

A wireless transmission system capable of performing a multi-station simultaneous transmission of data, that is, simultaneously transmitting data by wireless to a plurality of stations. The wireless transmission system includes a plurality of wireless stations for transmitting / receiving data and it constitutes a system for path diversity by use of a wireless station at the transmitting end, a multipath transmission path, and a wireless station at the receiving end. At least one of the plurality of wireless stations decides, in accordance with a response packet responsive to a multi-station simultaneous transmission request packet transmitted by the wireless station or other stations, a plurality of delay amounts relative to a reference timing during the multi-station simultaneous transmission in the wireless transmission system. It is arranged that each difference between the plurality of delay amounts be greater than a predetermined delay resolution and that the difference between the maximum and minimum values in the plurality of delay amounts be smaller than a predetermined maximum delay.

The invention relates to a method of a multipath TCP having mobility and combined with a mobile IP (internet protocol), belonging to the field of multipath TCP technology application. The method of the multipath TCP having the mobility and combined with the mobile IP aims at providing a mobility support for a multipath TCP supporting mobile host and can satisfy user requirements of using a plurality of interfaces at the same time and communicating at all times and places. The method of the multipath TCP having the mobility and combined with the mobile IP realizes multiconnection and mobility support by combining a multipath TCP and the mobile IP. A modified mobile IP layer is in charge of supporting the mobility, a multipath TCP layer is in charge of establishing and managing multiple paths, and therefore, the host motion and the multipath transmission data are transparent for an application layer in order to realize the multipath TCP with the mobility.

The invention provides a multi-path transmission control method based on fountain codes, which belongs to the technical field of internet transmission control. The working method of the multi-path TCP protocol based on fountain codes comprises in turn the following steps of: when a sender needs to send data, firstly storing the data in a cache region by blocks, and then compiling the data blocks into fountain code symbols by an encoding module; and, requesting the data from the data blocks by a data distributing module according to substream request and each subpath quality parameter EAT obtained by path evaluation, and distributing the fountain codes obtained after encoding by using virtual data distributing algorithm to each subpath for transmission. The data retransmission probability in the process of transmitting data in subpaths with different transmission qualities by multi-path transmission control protocol (MPTCP) can be effectively reduced, bottle neck effect of low quality path is reduced, data packets transmitted in the subpaths are made to reach the receiver in order as far as possible, limitation of receiving cache size of the receiver is reduced, and network throughput is increased.